dma: dw: split driver to library part and platform code
authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Wed, 5 Jun 2013 12:26:45 +0000 (15:26 +0300)
committerVinod Koul <vinod.koul@intel.com>
Fri, 5 Jul 2013 06:10:44 +0000 (11:40 +0530)
To simplify the driver development let's split driver to library and platform
code parts. It helps us to add PCI driver in future.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
[Fixed compile error and few checkpatch issues]
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
drivers/dma/Makefile
drivers/dma/dw/Kconfig
drivers/dma/dw/Makefile
drivers/dma/dw/core.c [new file with mode: 0644]
drivers/dma/dw/dw_dmac.c [deleted file]
drivers/dma/dw/dw_dmac_regs.h [deleted file]
drivers/dma/dw/internal.h [new file with mode: 0644]
drivers/dma/dw/platform.c [new file with mode: 0644]
drivers/dma/dw/regs.h [new file with mode: 0644]

index ac44ca0d468aecb1fffd4cd8a7183080c8cd509c..6e2a521fbbe37e663658328c48cdb091bbb55c56 100644 (file)
@@ -15,7 +15,7 @@ obj-$(CONFIG_FSL_DMA) += fsldma.o
 obj-$(CONFIG_MPC512X_DMA) += mpc512x_dma.o
 obj-$(CONFIG_PPC_BESTCOMM) += bestcomm/
 obj-$(CONFIG_MV_XOR) += mv_xor.o
-obj-$(CONFIG_DW_DMAC) += dw/
+obj-$(CONFIG_DW_DMAC_CORE) += dw/
 obj-$(CONFIG_AT_HDMAC) += at_hdmac.o
 obj-$(CONFIG_MX3_IPU) += ipu/
 obj-$(CONFIG_TXX9_DMAC) += txx9dmac.o
index 38a215af5cccef476f48cd0df28b1a22c4378de7..efd9e02a58eb398f7155734eb9f1af4776098185 100644 (file)
@@ -2,10 +2,14 @@
 # DMA engine configuration for dw
 #
 
-config DW_DMAC
+config DW_DMAC_CORE
        tristate "Synopsys DesignWare AHB DMA support"
        depends on GENERIC_HARDIRQS
        select DMA_ENGINE
+
+config DW_DMAC
+       tristate "Synopsys DesignWare AHB DMA platform driver"
+       select DW_DMAC_CORE
        default y if CPU_AT32AP7000
        help
          Support the Synopsys DesignWare AHB DMA controller. This
@@ -14,7 +18,7 @@ config DW_DMAC
 config DW_DMAC_BIG_ENDIAN_IO
        bool "Use big endian I/O register access"
        default y if AVR32
-       depends on DW_DMAC
+       depends on DW_DMAC_CORE
        help
          Say yes here to use big endian I/O access when reading and writing
          to the DMA controller registers. This is needed on some platforms,
index dd8d9936beef551c1075dc7676cb2e9dc4ffb160..47f36746c55987381335fc51c56b0b2bf6e1dbf0 100644 (file)
@@ -1 +1,5 @@
-obj-$(CONFIG_DW_DMAC) += dw_dmac.o
+obj-$(CONFIG_DW_DMAC_CORE)     += dw_dmac_core.o
+dw_dmac_core-objs      := core.o
+
+obj-$(CONFIG_DW_DMAC)          += dw_dmac.o
+dw_dmac-objs           := platform.o
diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
new file mode 100644 (file)
index 0000000..eea479c
--- /dev/null
@@ -0,0 +1,1730 @@
+/*
+ * Core driver for the Synopsys DesignWare DMA Controller
+ *
+ * Copyright (C) 2007-2008 Atmel Corporation
+ * Copyright (C) 2010-2011 ST Microelectronics
+ * Copyright (C) 2013 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmapool.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#include "../dmaengine.h"
+#include "internal.h"
+
+/*
+ * This supports the Synopsys "DesignWare AHB Central DMA Controller",
+ * (DW_ahb_dmac) which is used with various AMBA 2.0 systems (not all
+ * of which use ARM any more).  See the "Databook" from Synopsys for
+ * information beyond what licensees probably provide.
+ *
+ * The driver has currently been tested only with the Atmel AT32AP7000,
+ * which does not support descriptor writeback.
+ */
+
+static inline void dwc_set_masters(struct dw_dma_chan *dwc)
+{
+       struct dw_dma *dw = to_dw_dma(dwc->chan.device);
+       struct dw_dma_slave *dws = dwc->chan.private;
+       unsigned char mmax = dw->nr_masters - 1;
+
+       if (dwc->request_line == ~0) {
+               dwc->src_master = min_t(unsigned char, mmax, dwc_get_sms(dws));
+               dwc->dst_master = min_t(unsigned char, mmax, dwc_get_dms(dws));
+       }
+}
+
+#define DWC_DEFAULT_CTLLO(_chan) ({                            \
+               struct dw_dma_chan *_dwc = to_dw_dma_chan(_chan);       \
+               struct dma_slave_config *_sconfig = &_dwc->dma_sconfig; \
+               bool _is_slave = is_slave_direction(_dwc->direction);   \
+               u8 _smsize = _is_slave ? _sconfig->src_maxburst :       \
+                       DW_DMA_MSIZE_16;                        \
+               u8 _dmsize = _is_slave ? _sconfig->dst_maxburst :       \
+                       DW_DMA_MSIZE_16;                        \
+                                                               \
+               (DWC_CTLL_DST_MSIZE(_dmsize)                    \
+                | DWC_CTLL_SRC_MSIZE(_smsize)                  \
+                | DWC_CTLL_LLP_D_EN                            \
+                | DWC_CTLL_LLP_S_EN                            \
+                | DWC_CTLL_DMS(_dwc->dst_master)               \
+                | DWC_CTLL_SMS(_dwc->src_master));             \
+       })
+
+/*
+ * Number of descriptors to allocate for each channel. This should be
+ * made configurable somehow; preferably, the clients (at least the
+ * ones using slave transfers) should be able to give us a hint.
+ */
+#define NR_DESCS_PER_CHANNEL   64
+
+/*----------------------------------------------------------------------*/
+
+static struct device *chan2dev(struct dma_chan *chan)
+{
+       return &chan->dev->device;
+}
+static struct device *chan2parent(struct dma_chan *chan)
+{
+       return chan->dev->device.parent;
+}
+
+static struct dw_desc *dwc_first_active(struct dw_dma_chan *dwc)
+{
+       return to_dw_desc(dwc->active_list.next);
+}
+
+static struct dw_desc *dwc_desc_get(struct dw_dma_chan *dwc)
+{
+       struct dw_desc *desc, *_desc;
+       struct dw_desc *ret = NULL;
+       unsigned int i = 0;
+       unsigned long flags;
+
+       spin_lock_irqsave(&dwc->lock, flags);
+       list_for_each_entry_safe(desc, _desc, &dwc->free_list, desc_node) {
+               i++;
+               if (async_tx_test_ack(&desc->txd)) {
+                       list_del(&desc->desc_node);
+                       ret = desc;
+                       break;
+               }
+               dev_dbg(chan2dev(&dwc->chan), "desc %p not ACKed\n", desc);
+       }
+       spin_unlock_irqrestore(&dwc->lock, flags);
+
+       dev_vdbg(chan2dev(&dwc->chan), "scanned %u descriptors on freelist\n", i);
+
+       return ret;
+}
+
+/*
+ * Move a descriptor, including any children, to the free list.
+ * `desc' must not be on any lists.
+ */
+static void dwc_desc_put(struct dw_dma_chan *dwc, struct dw_desc *desc)
+{
+       unsigned long flags;
+
+       if (desc) {
+               struct dw_desc *child;
+
+               spin_lock_irqsave(&dwc->lock, flags);
+               list_for_each_entry(child, &desc->tx_list, desc_node)
+                       dev_vdbg(chan2dev(&dwc->chan),
+                                       "moving child desc %p to freelist\n",
+                                       child);
+               list_splice_init(&desc->tx_list, &dwc->free_list);
+               dev_vdbg(chan2dev(&dwc->chan), "moving desc %p to freelist\n", desc);
+               list_add(&desc->desc_node, &dwc->free_list);
+               spin_unlock_irqrestore(&dwc->lock, flags);
+       }
+}
+
+static void dwc_initialize(struct dw_dma_chan *dwc)
+{
+       struct dw_dma *dw = to_dw_dma(dwc->chan.device);
+       struct dw_dma_slave *dws = dwc->chan.private;
+       u32 cfghi = DWC_CFGH_FIFO_MODE;
+       u32 cfglo = DWC_CFGL_CH_PRIOR(dwc->priority);
+
+       if (dwc->initialized == true)
+               return;
+
+       if (dws) {
+               /*
+                * We need controller-specific data to set up slave
+                * transfers.
+                */
+               BUG_ON(!dws->dma_dev || dws->dma_dev != dw->dma.dev);
+
+               cfghi = dws->cfg_hi;
+               cfglo |= dws->cfg_lo & ~DWC_CFGL_CH_PRIOR_MASK;
+       } else {
+               if (dwc->direction == DMA_MEM_TO_DEV)
+                       cfghi = DWC_CFGH_DST_PER(dwc->request_line);
+               else if (dwc->direction == DMA_DEV_TO_MEM)
+                       cfghi = DWC_CFGH_SRC_PER(dwc->request_line);
+       }
+
+       channel_writel(dwc, CFG_LO, cfglo);
+       channel_writel(dwc, CFG_HI, cfghi);
+
+       /* Enable interrupts */
+       channel_set_bit(dw, MASK.XFER, dwc->mask);
+       channel_set_bit(dw, MASK.ERROR, dwc->mask);
+
+       dwc->initialized = true;
+}
+
+/*----------------------------------------------------------------------*/
+
+static inline unsigned int dwc_fast_fls(unsigned long long v)
+{
+       /*
+        * We can be a lot more clever here, but this should take care
+        * of the most common optimization.
+        */
+       if (!(v & 7))
+               return 3;
+       else if (!(v & 3))
+               return 2;
+       else if (!(v & 1))
+               return 1;
+       return 0;
+}
+
+static inline void dwc_dump_chan_regs(struct dw_dma_chan *dwc)
+{
+       dev_err(chan2dev(&dwc->chan),
+               "  SAR: 0x%x DAR: 0x%x LLP: 0x%x CTL: 0x%x:%08x\n",
+               channel_readl(dwc, SAR),
+               channel_readl(dwc, DAR),
+               channel_readl(dwc, LLP),
+               channel_readl(dwc, CTL_HI),
+               channel_readl(dwc, CTL_LO));
+}
+
+static inline void dwc_chan_disable(struct dw_dma *dw, struct dw_dma_chan *dwc)
+{
+       channel_clear_bit(dw, CH_EN, dwc->mask);
+       while (dma_readl(dw, CH_EN) & dwc->mask)
+               cpu_relax();
+}
+
+/*----------------------------------------------------------------------*/
+
+/* Perform single block transfer */
+static inline void dwc_do_single_block(struct dw_dma_chan *dwc,
+                                      struct dw_desc *desc)
+{
+       struct dw_dma   *dw = to_dw_dma(dwc->chan.device);
+       u32             ctllo;
+
+       /* Software emulation of LLP mode relies on interrupts to continue
+        * multi block transfer. */
+       ctllo = desc->lli.ctllo | DWC_CTLL_INT_EN;
+
+       channel_writel(dwc, SAR, desc->lli.sar);
+       channel_writel(dwc, DAR, desc->lli.dar);
+       channel_writel(dwc, CTL_LO, ctllo);
+       channel_writel(dwc, CTL_HI, desc->lli.ctlhi);
+       channel_set_bit(dw, CH_EN, dwc->mask);
+
+       /* Move pointer to next descriptor */
+       dwc->tx_node_active = dwc->tx_node_active->next;
+}
+
+/* Called with dwc->lock held and bh disabled */
+static void dwc_dostart(struct dw_dma_chan *dwc, struct dw_desc *first)
+{
+       struct dw_dma   *dw = to_dw_dma(dwc->chan.device);
+       unsigned long   was_soft_llp;
+
+       /* ASSERT:  channel is idle */
+       if (dma_readl(dw, CH_EN) & dwc->mask) {
+               dev_err(chan2dev(&dwc->chan),
+                       "BUG: Attempted to start non-idle channel\n");
+               dwc_dump_chan_regs(dwc);
+
+               /* The tasklet will hopefully advance the queue... */
+               return;
+       }
+
+       if (dwc->nollp) {
+               was_soft_llp = test_and_set_bit(DW_DMA_IS_SOFT_LLP,
+                                               &dwc->flags);
+               if (was_soft_llp) {
+                       dev_err(chan2dev(&dwc->chan),
+                               "BUG: Attempted to start new LLP transfer "
+                               "inside ongoing one\n");
+                       return;
+               }
+
+               dwc_initialize(dwc);
+
+               dwc->residue = first->total_len;
+               dwc->tx_node_active = &first->tx_list;
+
+               /* Submit first block */
+               dwc_do_single_block(dwc, first);
+
+               return;
+       }
+
+       dwc_initialize(dwc);
+
+       channel_writel(dwc, LLP, first->txd.phys);
+       channel_writel(dwc, CTL_LO,
+                       DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN);
+       channel_writel(dwc, CTL_HI, 0);
+       channel_set_bit(dw, CH_EN, dwc->mask);
+}
+
+/*----------------------------------------------------------------------*/
+
+static void
+dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc,
+               bool callback_required)
+{
+       dma_async_tx_callback           callback = NULL;
+       void                            *param = NULL;
+       struct dma_async_tx_descriptor  *txd = &desc->txd;
+       struct dw_desc                  *child;
+       unsigned long                   flags;
+
+       dev_vdbg(chan2dev(&dwc->chan), "descriptor %u complete\n", txd->cookie);
+
+       spin_lock_irqsave(&dwc->lock, flags);
+       dma_cookie_complete(txd);
+       if (callback_required) {
+               callback = txd->callback;
+               param = txd->callback_param;
+       }
+
+       /* async_tx_ack */
+       list_for_each_entry(child, &desc->tx_list, desc_node)
+               async_tx_ack(&child->txd);
+       async_tx_ack(&desc->txd);
+
+       list_splice_init(&desc->tx_list, &dwc->free_list);
+       list_move(&desc->desc_node, &dwc->free_list);
+
+       if (!is_slave_direction(dwc->direction)) {
+               struct device *parent = chan2parent(&dwc->chan);
+               if (!(txd->flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
+                       if (txd->flags & DMA_COMPL_DEST_UNMAP_SINGLE)
+                               dma_unmap_single(parent, desc->lli.dar,
+                                       desc->total_len, DMA_FROM_DEVICE);
+                       else
+                               dma_unmap_page(parent, desc->lli.dar,
+                                       desc->total_len, DMA_FROM_DEVICE);
+               }
+               if (!(txd->flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
+                       if (txd->flags & DMA_COMPL_SRC_UNMAP_SINGLE)
+                               dma_unmap_single(parent, desc->lli.sar,
+                                       desc->total_len, DMA_TO_DEVICE);
+                       else
+                               dma_unmap_page(parent, desc->lli.sar,
+                                       desc->total_len, DMA_TO_DEVICE);
+               }
+       }
+
+       spin_unlock_irqrestore(&dwc->lock, flags);
+
+       if (callback)
+               callback(param);
+}
+
+static void dwc_complete_all(struct dw_dma *dw, struct dw_dma_chan *dwc)
+{
+       struct dw_desc *desc, *_desc;
+       LIST_HEAD(list);
+       unsigned long flags;
+
+       spin_lock_irqsave(&dwc->lock, flags);
+       if (dma_readl(dw, CH_EN) & dwc->mask) {
+               dev_err(chan2dev(&dwc->chan),
+                       "BUG: XFER bit set, but channel not idle!\n");
+
+               /* Try to continue after resetting the channel... */
+               dwc_chan_disable(dw, dwc);
+       }
+
+       /*
+        * Submit queued descriptors ASAP, i.e. before we go through
+        * the completed ones.
+        */
+       list_splice_init(&dwc->active_list, &list);
+       if (!list_empty(&dwc->queue)) {
+               list_move(dwc->queue.next, &dwc->active_list);
+               dwc_dostart(dwc, dwc_first_active(dwc));
+       }
+
+       spin_unlock_irqrestore(&dwc->lock, flags);
+
+       list_for_each_entry_safe(desc, _desc, &list, desc_node)
+               dwc_descriptor_complete(dwc, desc, true);
+}
+
+/* Returns how many bytes were already received from source */
+static inline u32 dwc_get_sent(struct dw_dma_chan *dwc)
+{
+       u32 ctlhi = channel_readl(dwc, CTL_HI);
+       u32 ctllo = channel_readl(dwc, CTL_LO);
+
+       return (ctlhi & DWC_CTLH_BLOCK_TS_MASK) * (1 << (ctllo >> 4 & 7));
+}
+
+static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
+{
+       dma_addr_t llp;
+       struct dw_desc *desc, *_desc;
+       struct dw_desc *child;
+       u32 status_xfer;
+       unsigned long flags;
+
+       spin_lock_irqsave(&dwc->lock, flags);
+       llp = channel_readl(dwc, LLP);
+       status_xfer = dma_readl(dw, RAW.XFER);
+
+       if (status_xfer & dwc->mask) {
+               /* Everything we've submitted is done */
+               dma_writel(dw, CLEAR.XFER, dwc->mask);
+
+               if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags)) {
+                       struct list_head *head, *active = dwc->tx_node_active;
+
+                       /*
+                        * We are inside first active descriptor.
+                        * Otherwise something is really wrong.
+                        */
+                       desc = dwc_first_active(dwc);
+
+                       head = &desc->tx_list;
+                       if (active != head) {
+                               /* Update desc to reflect last sent one */
+                               if (active != head->next)
+                                       desc = to_dw_desc(active->prev);
+
+                               dwc->residue -= desc->len;
+
+                               child = to_dw_desc(active);
+
+                               /* Submit next block */
+                               dwc_do_single_block(dwc, child);
+
+                               spin_unlock_irqrestore(&dwc->lock, flags);
+                               return;
+                       }
+
+                       /* We are done here */
+                       clear_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags);
+               }
+
+               dwc->residue = 0;
+
+               spin_unlock_irqrestore(&dwc->lock, flags);
+
+               dwc_complete_all(dw, dwc);
+               return;
+       }
+
+       if (list_empty(&dwc->active_list)) {
+               dwc->residue = 0;
+               spin_unlock_irqrestore(&dwc->lock, flags);
+               return;
+       }
+
+       if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags)) {
+               dev_vdbg(chan2dev(&dwc->chan), "%s: soft LLP mode\n", __func__);
+               spin_unlock_irqrestore(&dwc->lock, flags);
+               return;
+       }
+
+       dev_vdbg(chan2dev(&dwc->chan), "%s: llp=0x%llx\n", __func__,
+                       (unsigned long long)llp);
+
+       list_for_each_entry_safe(desc, _desc, &dwc->active_list, desc_node) {
+               /* Initial residue value */
+               dwc->residue = desc->total_len;
+
+               /* Check first descriptors addr */
+               if (desc->txd.phys == llp) {
+                       spin_unlock_irqrestore(&dwc->lock, flags);
+                       return;
+               }
+
+               /* Check first descriptors llp */
+               if (desc->lli.llp == llp) {
+                       /* This one is currently in progress */
+                       dwc->residue -= dwc_get_sent(dwc);
+                       spin_unlock_irqrestore(&dwc->lock, flags);
+                       return;
+               }
+
+               dwc->residue -= desc->len;
+               list_for_each_entry(child, &desc->tx_list, desc_node) {
+                       if (child->lli.llp == llp) {
+                               /* Currently in progress */
+                               dwc->residue -= dwc_get_sent(dwc);
+                               spin_unlock_irqrestore(&dwc->lock, flags);
+                               return;
+                       }
+                       dwc->residue -= child->len;
+               }
+
+               /*
+                * No descriptors so far seem to be in progress, i.e.
+                * this one must be done.
+                */
+               spin_unlock_irqrestore(&dwc->lock, flags);
+               dwc_descriptor_complete(dwc, desc, true);
+               spin_lock_irqsave(&dwc->lock, flags);
+       }
+
+       dev_err(chan2dev(&dwc->chan),
+               "BUG: All descriptors done, but channel not idle!\n");
+
+       /* Try to continue after resetting the channel... */
+       dwc_chan_disable(dw, dwc);
+
+       if (!list_empty(&dwc->queue)) {
+               list_move(dwc->queue.next, &dwc->active_list);
+               dwc_dostart(dwc, dwc_first_active(dwc));
+       }
+       spin_unlock_irqrestore(&dwc->lock, flags);
+}
+
+static inline void dwc_dump_lli(struct dw_dma_chan *dwc, struct dw_lli *lli)
+{
+       dev_crit(chan2dev(&dwc->chan), "  desc: s0x%x d0x%x l0x%x c0x%x:%x\n",
+                lli->sar, lli->dar, lli->llp, lli->ctlhi, lli->ctllo);
+}
+
+static void dwc_handle_error(struct dw_dma *dw, struct dw_dma_chan *dwc)
+{
+       struct dw_desc *bad_desc;
+       struct dw_desc *child;
+       unsigned long flags;
+
+       dwc_scan_descriptors(dw, dwc);
+
+       spin_lock_irqsave(&dwc->lock, flags);
+
+       /*
+        * The descriptor currently at the head of the active list is
+        * borked. Since we don't have any way to report errors, we'll
+        * just have to scream loudly and try to carry on.
+        */
+       bad_desc = dwc_first_active(dwc);
+       list_del_init(&bad_desc->desc_node);
+       list_move(dwc->queue.next, dwc->active_list.prev);
+
+       /* Clear the error flag and try to restart the controller */
+       dma_writel(dw, CLEAR.ERROR, dwc->mask);
+       if (!list_empty(&dwc->active_list))
+               dwc_dostart(dwc, dwc_first_active(dwc));
+
+       /*
+        * WARN may seem harsh, but since this only happens
+        * when someone submits a bad physical address in a
+        * descriptor, we should consider ourselves lucky that the
+        * controller flagged an error instead of scribbling over
+        * random memory locations.
+        */
+       dev_WARN(chan2dev(&dwc->chan), "Bad descriptor submitted for DMA!\n"
+                                      "  cookie: %d\n", bad_desc->txd.cookie);
+       dwc_dump_lli(dwc, &bad_desc->lli);
+       list_for_each_entry(child, &bad_desc->tx_list, desc_node)
+               dwc_dump_lli(dwc, &child->lli);
+
+       spin_unlock_irqrestore(&dwc->lock, flags);
+
+       /* Pretend the descriptor completed successfully */
+       dwc_descriptor_complete(dwc, bad_desc, true);
+}
+
+/* --------------------- Cyclic DMA API extensions -------------------- */
+
+dma_addr_t dw_dma_get_src_addr(struct dma_chan *chan)
+{
+       struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
+       return channel_readl(dwc, SAR);
+}
+EXPORT_SYMBOL(dw_dma_get_src_addr);
+
+dma_addr_t dw_dma_get_dst_addr(struct dma_chan *chan)
+{
+       struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
+       return channel_readl(dwc, DAR);
+}
+EXPORT_SYMBOL(dw_dma_get_dst_addr);
+
+/* Called with dwc->lock held and all DMAC interrupts disabled */
+static void dwc_handle_cyclic(struct dw_dma *dw, struct dw_dma_chan *dwc,
+               u32 status_err, u32 status_xfer)
+{
+       unsigned long flags;
+
+       if (dwc->mask) {
+               void (*callback)(void *param);
+               void *callback_param;
+
+               dev_vdbg(chan2dev(&dwc->chan), "new cyclic period llp 0x%08x\n",
+                               channel_readl(dwc, LLP));
+
+               callback = dwc->cdesc->period_callback;
+               callback_param = dwc->cdesc->period_callback_param;
+
+               if (callback)
+                       callback(callback_param);
+       }
+
+       /*
+        * Error and transfer complete are highly unlikely, and will most
+        * likely be due to a configuration error by the user.
+        */
+       if (unlikely(status_err & dwc->mask) ||
+                       unlikely(status_xfer & dwc->mask)) {
+               int i;
+
+               dev_err(chan2dev(&dwc->chan), "cyclic DMA unexpected %s "
+                               "interrupt, stopping DMA transfer\n",
+                               status_xfer ? "xfer" : "error");
+
+               spin_lock_irqsave(&dwc->lock, flags);
+
+               dwc_dump_chan_regs(dwc);
+
+               dwc_chan_disable(dw, dwc);
+
+               /* Make sure DMA does not restart by loading a new list */
+               channel_writel(dwc, LLP, 0);
+               channel_writel(dwc, CTL_LO, 0);
+               channel_writel(dwc, CTL_HI, 0);
+
+               dma_writel(dw, CLEAR.ERROR, dwc->mask);
+               dma_writel(dw, CLEAR.XFER, dwc->mask);
+
+               for (i = 0; i < dwc->cdesc->periods; i++)
+                       dwc_dump_lli(dwc, &dwc->cdesc->desc[i]->lli);
+
+               spin_unlock_irqrestore(&dwc->lock, flags);
+       }
+}
+
+/* ------------------------------------------------------------------------- */
+
+static void dw_dma_tasklet(unsigned long data)
+{
+       struct dw_dma *dw = (struct dw_dma *)data;
+       struct dw_dma_chan *dwc;
+       u32 status_xfer;
+       u32 status_err;
+       int i;
+
+       status_xfer = dma_readl(dw, RAW.XFER);
+       status_err = dma_readl(dw, RAW.ERROR);
+
+       dev_vdbg(dw->dma.dev, "%s: status_err=%x\n", __func__, status_err);
+
+       for (i = 0; i < dw->dma.chancnt; i++) {
+               dwc = &dw->chan[i];
+               if (test_bit(DW_DMA_IS_CYCLIC, &dwc->flags))
+                       dwc_handle_cyclic(dw, dwc, status_err, status_xfer);
+               else if (status_err & (1 << i))
+                       dwc_handle_error(dw, dwc);
+               else if (status_xfer & (1 << i))
+                       dwc_scan_descriptors(dw, dwc);
+       }
+
+       /*
+        * Re-enable interrupts.
+        */
+       channel_set_bit(dw, MASK.XFER, dw->all_chan_mask);
+       channel_set_bit(dw, MASK.ERROR, dw->all_chan_mask);
+}
+
+static irqreturn_t dw_dma_interrupt(int irq, void *dev_id)
+{
+       struct dw_dma *dw = dev_id;
+       u32 status;
+
+       dev_vdbg(dw->dma.dev, "%s: status=0x%x\n", __func__,
+                       dma_readl(dw, STATUS_INT));
+
+       /*
+        * Just disable the interrupts. We'll turn them back on in the
+        * softirq handler.
+        */
+       channel_clear_bit(dw, MASK.XFER, dw->all_chan_mask);
+       channel_clear_bit(dw, MASK.ERROR, dw->all_chan_mask);
+
+       status = dma_readl(dw, STATUS_INT);
+       if (status) {
+               dev_err(dw->dma.dev,
+                       "BUG: Unexpected interrupts pending: 0x%x\n",
+                       status);
+
+               /* Try to recover */
+               channel_clear_bit(dw, MASK.XFER, (1 << 8) - 1);
+               channel_clear_bit(dw, MASK.SRC_TRAN, (1 << 8) - 1);
+               channel_clear_bit(dw, MASK.DST_TRAN, (1 << 8) - 1);
+               channel_clear_bit(dw, MASK.ERROR, (1 << 8) - 1);
+       }
+
+       tasklet_schedule(&dw->tasklet);
+
+       return IRQ_HANDLED;
+}
+
+/*----------------------------------------------------------------------*/
+
+static dma_cookie_t dwc_tx_submit(struct dma_async_tx_descriptor *tx)
+{
+       struct dw_desc          *desc = txd_to_dw_desc(tx);
+       struct dw_dma_chan      *dwc = to_dw_dma_chan(tx->chan);
+       dma_cookie_t            cookie;
+       unsigned long           flags;
+
+       spin_lock_irqsave(&dwc->lock, flags);
+       cookie = dma_cookie_assign(tx);
+
+       /*
+        * REVISIT: We should attempt to chain as many descriptors as
+        * possible, perhaps even appending to those already submitted
+        * for DMA. But this is hard to do in a race-free manner.
+        */
+       if (list_empty(&dwc->active_list)) {
+               dev_vdbg(chan2dev(tx->chan), "%s: started %u\n", __func__,
+                               desc->txd.cookie);
+               list_add_tail(&desc->desc_node, &dwc->active_list);
+               dwc_dostart(dwc, dwc_first_active(dwc));
+       } else {
+               dev_vdbg(chan2dev(tx->chan), "%s: queued %u\n", __func__,
+                               desc->txd.cookie);
+
+               list_add_tail(&desc->desc_node, &dwc->queue);
+       }
+
+       spin_unlock_irqrestore(&dwc->lock, flags);
+
+       return cookie;
+}
+
+static struct dma_async_tx_descriptor *
+dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
+               size_t len, unsigned long flags)
+{
+       struct dw_dma_chan      *dwc = to_dw_dma_chan(chan);
+       struct dw_dma           *dw = to_dw_dma(chan->device);
+       struct dw_desc          *desc;
+       struct dw_desc          *first;
+       struct dw_desc          *prev;
+       size_t                  xfer_count;
+       size_t                  offset;
+       unsigned int            src_width;
+       unsigned int            dst_width;
+       unsigned int            data_width;
+       u32                     ctllo;
+
+       dev_vdbg(chan2dev(chan),
+                       "%s: d0x%llx s0x%llx l0x%zx f0x%lx\n", __func__,
+                       (unsigned long long)dest, (unsigned long long)src,
+                       len, flags);
+
+       if (unlikely(!len)) {
+               dev_dbg(chan2dev(chan), "%s: length is zero!\n", __func__);
+               return NULL;
+       }
+
+       dwc->direction = DMA_MEM_TO_MEM;
+
+       data_width = min_t(unsigned int, dw->data_width[dwc->src_master],
+                          dw->data_width[dwc->dst_master]);
+
+       src_width = dst_width = min_t(unsigned int, data_width,
+                                     dwc_fast_fls(src | dest | len));
+
+       ctllo = DWC_DEFAULT_CTLLO(chan)
+                       | DWC_CTLL_DST_WIDTH(dst_width)
+                       | DWC_CTLL_SRC_WIDTH(src_width)
+                       | DWC_CTLL_DST_INC
+                       | DWC_CTLL_SRC_INC
+                       | DWC_CTLL_FC_M2M;
+       prev = first = NULL;
+
+       for (offset = 0; offset < len; offset += xfer_count << src_width) {
+               xfer_count = min_t(size_t, (len - offset) >> src_width,
+                                          dwc->block_size);
+
+               desc = dwc_desc_get(dwc);
+               if (!desc)
+                       goto err_desc_get;
+
+               desc->lli.sar = src + offset;
+               desc->lli.dar = dest + offset;
+               desc->lli.ctllo = ctllo;
+               desc->lli.ctlhi = xfer_count;
+               desc->len = xfer_count << src_width;
+
+               if (!first) {
+                       first = desc;
+               } else {
+                       prev->lli.llp = desc->txd.phys;
+                       list_add_tail(&desc->desc_node,
+                                       &first->tx_list);
+               }
+               prev = desc;
+       }
+
+       if (flags & DMA_PREP_INTERRUPT)
+               /* Trigger interrupt after last block */
+               prev->lli.ctllo |= DWC_CTLL_INT_EN;
+
+       prev->lli.llp = 0;
+       first->txd.flags = flags;
+       first->total_len = len;
+
+       return &first->txd;
+
+err_desc_get:
+       dwc_desc_put(dwc, first);
+       return NULL;
+}
+
+static struct dma_async_tx_descriptor *
+dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
+               unsigned int sg_len, enum dma_transfer_direction direction,
+               unsigned long flags, void *context)
+{
+       struct dw_dma_chan      *dwc = to_dw_dma_chan(chan);
+       struct dw_dma           *dw = to_dw_dma(chan->device);
+       struct dma_slave_config *sconfig = &dwc->dma_sconfig;
+       struct dw_desc          *prev;
+       struct dw_desc          *first;
+       u32                     ctllo;
+       dma_addr_t              reg;
+       unsigned int            reg_width;
+       unsigned int            mem_width;
+       unsigned int            data_width;
+       unsigned int            i;
+       struct scatterlist      *sg;
+       size_t                  total_len = 0;
+
+       dev_vdbg(chan2dev(chan), "%s\n", __func__);
+
+       if (unlikely(!is_slave_direction(direction) || !sg_len))
+               return NULL;
+
+       dwc->direction = direction;
+
+       prev = first = NULL;
+
+       switch (direction) {
+       case DMA_MEM_TO_DEV:
+               reg_width = __fls(sconfig->dst_addr_width);
+               reg = sconfig->dst_addr;
+               ctllo = (DWC_DEFAULT_CTLLO(chan)
+                               | DWC_CTLL_DST_WIDTH(reg_width)
+                               | DWC_CTLL_DST_FIX
+                               | DWC_CTLL_SRC_INC);
+
+               ctllo |= sconfig->device_fc ? DWC_CTLL_FC(DW_DMA_FC_P_M2P) :
+                       DWC_CTLL_FC(DW_DMA_FC_D_M2P);
+
+               data_width = dw->data_width[dwc->src_master];
+
+               for_each_sg(sgl, sg, sg_len, i) {
+                       struct dw_desc  *desc;
+                       u32             len, dlen, mem;
+
+                       mem = sg_dma_address(sg);
+                       len = sg_dma_len(sg);
+
+                       mem_width = min_t(unsigned int,
+                                         data_width, dwc_fast_fls(mem | len));
+
+slave_sg_todev_fill_desc:
+                       desc = dwc_desc_get(dwc);
+                       if (!desc) {
+                               dev_err(chan2dev(chan),
+                                       "not enough descriptors available\n");
+                               goto err_desc_get;
+                       }
+
+                       desc->lli.sar = mem;
+                       desc->lli.dar = reg;
+                       desc->lli.ctllo = ctllo | DWC_CTLL_SRC_WIDTH(mem_width);
+                       if ((len >> mem_width) > dwc->block_size) {
+                               dlen = dwc->block_size << mem_width;
+                               mem += dlen;
+                               len -= dlen;
+                       } else {
+                               dlen = len;
+                               len = 0;
+                       }
+
+                       desc->lli.ctlhi = dlen >> mem_width;
+                       desc->len = dlen;
+
+                       if (!first) {
+                               first = desc;
+                       } else {
+                               prev->lli.llp = desc->txd.phys;
+                               list_add_tail(&desc->desc_node,
+                                               &first->tx_list);
+                       }
+                       prev = desc;
+                       total_len += dlen;
+
+                       if (len)
+                               goto slave_sg_todev_fill_desc;
+               }
+               break;
+       case DMA_DEV_TO_MEM:
+               reg_width = __fls(sconfig->src_addr_width);
+               reg = sconfig->src_addr;
+               ctllo = (DWC_DEFAULT_CTLLO(chan)
+                               | DWC_CTLL_SRC_WIDTH(reg_width)
+                               | DWC_CTLL_DST_INC
+                               | DWC_CTLL_SRC_FIX);
+
+               ctllo |= sconfig->device_fc ? DWC_CTLL_FC(DW_DMA_FC_P_P2M) :
+                       DWC_CTLL_FC(DW_DMA_FC_D_P2M);
+
+               data_width = dw->data_width[dwc->dst_master];
+
+               for_each_sg(sgl, sg, sg_len, i) {
+                       struct dw_desc  *desc;
+                       u32             len, dlen, mem;
+
+                       mem = sg_dma_address(sg);
+                       len = sg_dma_len(sg);
+
+                       mem_width = min_t(unsigned int,
+                                         data_width, dwc_fast_fls(mem | len));
+
+slave_sg_fromdev_fill_desc:
+                       desc = dwc_desc_get(dwc);
+                       if (!desc) {
+                               dev_err(chan2dev(chan),
+                                               "not enough descriptors available\n");
+                               goto err_desc_get;
+                       }
+
+                       desc->lli.sar = reg;
+                       desc->lli.dar = mem;
+                       desc->lli.ctllo = ctllo | DWC_CTLL_DST_WIDTH(mem_width);
+                       if ((len >> reg_width) > dwc->block_size) {
+                               dlen = dwc->block_size << reg_width;
+                               mem += dlen;
+                               len -= dlen;
+                       } else {
+                               dlen = len;
+                               len = 0;
+                       }
+                       desc->lli.ctlhi = dlen >> reg_width;
+                       desc->len = dlen;
+
+                       if (!first) {
+                               first = desc;
+                       } else {
+                               prev->lli.llp = desc->txd.phys;
+                               list_add_tail(&desc->desc_node,
+                                               &first->tx_list);
+                       }
+                       prev = desc;
+                       total_len += dlen;
+
+                       if (len)
+                               goto slave_sg_fromdev_fill_desc;
+               }
+               break;
+       default:
+               return NULL;
+       }
+
+       if (flags & DMA_PREP_INTERRUPT)
+               /* Trigger interrupt after last block */
+               prev->lli.ctllo |= DWC_CTLL_INT_EN;
+
+       prev->lli.llp = 0;
+       first->total_len = total_len;
+
+       return &first->txd;
+
+err_desc_get:
+       dwc_desc_put(dwc, first);
+       return NULL;
+}
+
+/*
+ * Fix sconfig's burst size according to dw_dmac. We need to convert them as:
+ * 1 -> 0, 4 -> 1, 8 -> 2, 16 -> 3.
+ *
+ * NOTE: burst size 2 is not supported by controller.
+ *
+ * This can be done by finding least significant bit set: n & (n - 1)
+ */
+static inline void convert_burst(u32 *maxburst)
+{
+       if (*maxburst > 1)
+               *maxburst = fls(*maxburst) - 2;
+       else
+               *maxburst = 0;
+}
+
+static int
+set_runtime_config(struct dma_chan *chan, struct dma_slave_config *sconfig)
+{
+       struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
+
+       /* Check if chan will be configured for slave transfers */
+       if (!is_slave_direction(sconfig->direction))
+               return -EINVAL;
+
+       memcpy(&dwc->dma_sconfig, sconfig, sizeof(*sconfig));
+       dwc->direction = sconfig->direction;
+
+       /* Take the request line from slave_id member */
+       if (dwc->request_line == ~0)
+               dwc->request_line = sconfig->slave_id;
+
+       convert_burst(&dwc->dma_sconfig.src_maxburst);
+       convert_burst(&dwc->dma_sconfig.dst_maxburst);
+
+       return 0;
+}
+
+static inline void dwc_chan_pause(struct dw_dma_chan *dwc)
+{
+       u32 cfglo = channel_readl(dwc, CFG_LO);
+       unsigned int count = 20;        /* timeout iterations */
+
+       channel_writel(dwc, CFG_LO, cfglo | DWC_CFGL_CH_SUSP);
+       while (!(channel_readl(dwc, CFG_LO) & DWC_CFGL_FIFO_EMPTY) && count--)
+               udelay(2);
+
+       dwc->paused = true;
+}
+
+static inline void dwc_chan_resume(struct dw_dma_chan *dwc)
+{
+       u32 cfglo = channel_readl(dwc, CFG_LO);
+
+       channel_writel(dwc, CFG_LO, cfglo & ~DWC_CFGL_CH_SUSP);
+
+       dwc->paused = false;
+}
+
+static int dwc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
+                      unsigned long arg)
+{
+       struct dw_dma_chan      *dwc = to_dw_dma_chan(chan);
+       struct dw_dma           *dw = to_dw_dma(chan->device);
+       struct dw_desc          *desc, *_desc;
+       unsigned long           flags;
+       LIST_HEAD(list);
+
+       if (cmd == DMA_PAUSE) {
+               spin_lock_irqsave(&dwc->lock, flags);
+
+               dwc_chan_pause(dwc);
+
+               spin_unlock_irqrestore(&dwc->lock, flags);
+       } else if (cmd == DMA_RESUME) {
+               if (!dwc->paused)
+                       return 0;
+
+               spin_lock_irqsave(&dwc->lock, flags);
+
+               dwc_chan_resume(dwc);
+
+               spin_unlock_irqrestore(&dwc->lock, flags);
+       } else if (cmd == DMA_TERMINATE_ALL) {
+               spin_lock_irqsave(&dwc->lock, flags);
+
+               clear_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags);
+
+               dwc_chan_disable(dw, dwc);
+
+               dwc_chan_resume(dwc);
+
+               /* active_list entries will end up before queued entries */
+               list_splice_init(&dwc->queue, &list);
+               list_splice_init(&dwc->active_list, &list);
+
+               spin_unlock_irqrestore(&dwc->lock, flags);
+
+               /* Flush all pending and queued descriptors */
+               list_for_each_entry_safe(desc, _desc, &list, desc_node)
+                       dwc_descriptor_complete(dwc, desc, false);
+       } else if (cmd == DMA_SLAVE_CONFIG) {
+               return set_runtime_config(chan, (struct dma_slave_config *)arg);
+       } else {
+               return -ENXIO;
+       }
+
+       return 0;
+}
+
+static inline u32 dwc_get_residue(struct dw_dma_chan *dwc)
+{
+       unsigned long flags;
+       u32 residue;
+
+       spin_lock_irqsave(&dwc->lock, flags);
+
+       residue = dwc->residue;
+       if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags) && residue)
+               residue -= dwc_get_sent(dwc);
+
+       spin_unlock_irqrestore(&dwc->lock, flags);
+       return residue;
+}
+
+static enum dma_status
+dwc_tx_status(struct dma_chan *chan,
+             dma_cookie_t cookie,
+             struct dma_tx_state *txstate)
+{
+       struct dw_dma_chan      *dwc = to_dw_dma_chan(chan);
+       enum dma_status         ret;
+
+       ret = dma_cookie_status(chan, cookie, txstate);
+       if (ret != DMA_SUCCESS) {
+               dwc_scan_descriptors(to_dw_dma(chan->device), dwc);
+
+               ret = dma_cookie_status(chan, cookie, txstate);
+       }
+
+       if (ret != DMA_SUCCESS)
+               dma_set_residue(txstate, dwc_get_residue(dwc));
+
+       if (dwc->paused)
+               return DMA_PAUSED;
+
+       return ret;
+}
+
+static void dwc_issue_pending(struct dma_chan *chan)
+{
+       struct dw_dma_chan      *dwc = to_dw_dma_chan(chan);
+
+       if (!list_empty(&dwc->queue))
+               dwc_scan_descriptors(to_dw_dma(chan->device), dwc);
+}
+
+static int dwc_alloc_chan_resources(struct dma_chan *chan)
+{
+       struct dw_dma_chan      *dwc = to_dw_dma_chan(chan);
+       struct dw_dma           *dw = to_dw_dma(chan->device);
+       struct dw_desc          *desc;
+       int                     i;
+       unsigned long           flags;
+
+       dev_vdbg(chan2dev(chan), "%s\n", __func__);
+
+       /* ASSERT:  channel is idle */
+       if (dma_readl(dw, CH_EN) & dwc->mask) {
+               dev_dbg(chan2dev(chan), "DMA channel not idle?\n");
+               return -EIO;
+       }
+
+       dma_cookie_init(chan);
+
+       /*
+        * NOTE: some controllers may have additional features that we
+        * need to initialize here, like "scatter-gather" (which
+        * doesn't mean what you think it means), and status writeback.
+        */
+
+       dwc_set_masters(dwc);
+
+       spin_lock_irqsave(&dwc->lock, flags);
+       i = dwc->descs_allocated;
+       while (dwc->descs_allocated < NR_DESCS_PER_CHANNEL) {
+               dma_addr_t phys;
+
+               spin_unlock_irqrestore(&dwc->lock, flags);
+
+               desc = dma_pool_alloc(dw->desc_pool, GFP_ATOMIC, &phys);
+               if (!desc)
+                       goto err_desc_alloc;
+
+               memset(desc, 0, sizeof(struct dw_desc));
+
+               INIT_LIST_HEAD(&desc->tx_list);
+               dma_async_tx_descriptor_init(&desc->txd, chan);
+               desc->txd.tx_submit = dwc_tx_submit;
+               desc->txd.flags = DMA_CTRL_ACK;
+               desc->txd.phys = phys;
+
+               dwc_desc_put(dwc, desc);
+
+               spin_lock_irqsave(&dwc->lock, flags);
+               i = ++dwc->descs_allocated;
+       }
+
+       spin_unlock_irqrestore(&dwc->lock, flags);
+
+       dev_dbg(chan2dev(chan), "%s: allocated %d descriptors\n", __func__, i);
+
+       return i;
+
+err_desc_alloc:
+       dev_info(chan2dev(chan), "only allocated %d descriptors\n", i);
+
+       return i;
+}
+
+static void dwc_free_chan_resources(struct dma_chan *chan)
+{
+       struct dw_dma_chan      *dwc = to_dw_dma_chan(chan);
+       struct dw_dma           *dw = to_dw_dma(chan->device);
+       struct dw_desc          *desc, *_desc;
+       unsigned long           flags;
+       LIST_HEAD(list);
+
+       dev_dbg(chan2dev(chan), "%s: descs allocated=%u\n", __func__,
+                       dwc->descs_allocated);
+
+       /* ASSERT:  channel is idle */
+       BUG_ON(!list_empty(&dwc->active_list));
+       BUG_ON(!list_empty(&dwc->queue));
+       BUG_ON(dma_readl(to_dw_dma(chan->device), CH_EN) & dwc->mask);
+
+       spin_lock_irqsave(&dwc->lock, flags);
+       list_splice_init(&dwc->free_list, &list);
+       dwc->descs_allocated = 0;
+       dwc->initialized = false;
+       dwc->request_line = ~0;
+
+       /* Disable interrupts */
+       channel_clear_bit(dw, MASK.XFER, dwc->mask);
+       channel_clear_bit(dw, MASK.ERROR, dwc->mask);
+
+       spin_unlock_irqrestore(&dwc->lock, flags);
+
+       list_for_each_entry_safe(desc, _desc, &list, desc_node) {
+               dev_vdbg(chan2dev(chan), "  freeing descriptor %p\n", desc);
+               dma_pool_free(dw->desc_pool, desc, desc->txd.phys);
+       }
+
+       dev_vdbg(chan2dev(chan), "%s: done\n", __func__);
+}
+
+/* --------------------- Cyclic DMA API extensions -------------------- */
+
+/**
+ * dw_dma_cyclic_start - start the cyclic DMA transfer
+ * @chan: the DMA channel to start
+ *
+ * Must be called with soft interrupts disabled. Returns zero on success or
+ * -errno on failure.
+ */
+int dw_dma_cyclic_start(struct dma_chan *chan)
+{
+       struct dw_dma_chan      *dwc = to_dw_dma_chan(chan);
+       struct dw_dma           *dw = to_dw_dma(dwc->chan.device);
+       unsigned long           flags;
+
+       if (!test_bit(DW_DMA_IS_CYCLIC, &dwc->flags)) {
+               dev_err(chan2dev(&dwc->chan), "missing prep for cyclic DMA\n");
+               return -ENODEV;
+       }
+
+       spin_lock_irqsave(&dwc->lock, flags);
+
+       /* Assert channel is idle */
+       if (dma_readl(dw, CH_EN) & dwc->mask) {
+               dev_err(chan2dev(&dwc->chan),
+                       "BUG: Attempted to start non-idle channel\n");
+               dwc_dump_chan_regs(dwc);
+               spin_unlock_irqrestore(&dwc->lock, flags);
+               return -EBUSY;
+       }
+
+       dma_writel(dw, CLEAR.ERROR, dwc->mask);
+       dma_writel(dw, CLEAR.XFER, dwc->mask);
+
+       /* Setup DMAC channel registers */
+       channel_writel(dwc, LLP, dwc->cdesc->desc[0]->txd.phys);
+       channel_writel(dwc, CTL_LO, DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN);
+       channel_writel(dwc, CTL_HI, 0);
+
+       channel_set_bit(dw, CH_EN, dwc->mask);
+
+       spin_unlock_irqrestore(&dwc->lock, flags);
+
+       return 0;
+}
+EXPORT_SYMBOL(dw_dma_cyclic_start);
+
+/**
+ * dw_dma_cyclic_stop - stop the cyclic DMA transfer
+ * @chan: the DMA channel to stop
+ *
+ * Must be called with soft interrupts disabled.
+ */
+void dw_dma_cyclic_stop(struct dma_chan *chan)
+{
+       struct dw_dma_chan      *dwc = to_dw_dma_chan(chan);
+       struct dw_dma           *dw = to_dw_dma(dwc->chan.device);
+       unsigned long           flags;
+
+       spin_lock_irqsave(&dwc->lock, flags);
+
+       dwc_chan_disable(dw, dwc);
+
+       spin_unlock_irqrestore(&dwc->lock, flags);
+}
+EXPORT_SYMBOL(dw_dma_cyclic_stop);
+
+/**
+ * dw_dma_cyclic_prep - prepare the cyclic DMA transfer
+ * @chan: the DMA channel to prepare
+ * @buf_addr: physical DMA address where the buffer starts
+ * @buf_len: total number of bytes for the entire buffer
+ * @period_len: number of bytes for each period
+ * @direction: transfer direction, to or from device
+ *
+ * Must be called before trying to start the transfer. Returns a valid struct
+ * dw_cyclic_desc if successful or an ERR_PTR(-errno) if not successful.
+ */
+struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
+               dma_addr_t buf_addr, size_t buf_len, size_t period_len,
+               enum dma_transfer_direction direction)
+{
+       struct dw_dma_chan              *dwc = to_dw_dma_chan(chan);
+       struct dma_slave_config         *sconfig = &dwc->dma_sconfig;
+       struct dw_cyclic_desc           *cdesc;
+       struct dw_cyclic_desc           *retval = NULL;
+       struct dw_desc                  *desc;
+       struct dw_desc                  *last = NULL;
+       unsigned long                   was_cyclic;
+       unsigned int                    reg_width;
+       unsigned int                    periods;
+       unsigned int                    i;
+       unsigned long                   flags;
+
+       spin_lock_irqsave(&dwc->lock, flags);
+       if (dwc->nollp) {
+               spin_unlock_irqrestore(&dwc->lock, flags);
+               dev_dbg(chan2dev(&dwc->chan),
+                               "channel doesn't support LLP transfers\n");
+               return ERR_PTR(-EINVAL);
+       }
+
+       if (!list_empty(&dwc->queue) || !list_empty(&dwc->active_list)) {
+               spin_unlock_irqrestore(&dwc->lock, flags);
+               dev_dbg(chan2dev(&dwc->chan),
+                               "queue and/or active list are not empty\n");
+               return ERR_PTR(-EBUSY);
+       }
+
+       was_cyclic = test_and_set_bit(DW_DMA_IS_CYCLIC, &dwc->flags);
+       spin_unlock_irqrestore(&dwc->lock, flags);
+       if (was_cyclic) {
+               dev_dbg(chan2dev(&dwc->chan),
+                               "channel already prepared for cyclic DMA\n");
+               return ERR_PTR(-EBUSY);
+       }
+
+       retval = ERR_PTR(-EINVAL);
+
+       if (unlikely(!is_slave_direction(direction)))
+               goto out_err;
+
+       dwc->direction = direction;
+
+       if (direction == DMA_MEM_TO_DEV)
+               reg_width = __ffs(sconfig->dst_addr_width);
+       else
+               reg_width = __ffs(sconfig->src_addr_width);
+
+       periods = buf_len / period_len;
+
+       /* Check for too big/unaligned periods and unaligned DMA buffer. */
+       if (period_len > (dwc->block_size << reg_width))
+               goto out_err;
+       if (unlikely(period_len & ((1 << reg_width) - 1)))
+               goto out_err;
+       if (unlikely(buf_addr & ((1 << reg_width) - 1)))
+               goto out_err;
+
+       retval = ERR_PTR(-ENOMEM);
+
+       if (periods > NR_DESCS_PER_CHANNEL)
+               goto out_err;
+
+       cdesc = kzalloc(sizeof(struct dw_cyclic_desc), GFP_KERNEL);
+       if (!cdesc)
+               goto out_err;
+
+       cdesc->desc = kzalloc(sizeof(struct dw_desc *) * periods, GFP_KERNEL);
+       if (!cdesc->desc)
+               goto out_err_alloc;
+
+       for (i = 0; i < periods; i++) {
+               desc = dwc_desc_get(dwc);
+               if (!desc)
+                       goto out_err_desc_get;
+
+               switch (direction) {
+               case DMA_MEM_TO_DEV:
+                       desc->lli.dar = sconfig->dst_addr;
+                       desc->lli.sar = buf_addr + (period_len * i);
+                       desc->lli.ctllo = (DWC_DEFAULT_CTLLO(chan)
+                                       | DWC_CTLL_DST_WIDTH(reg_width)
+                                       | DWC_CTLL_SRC_WIDTH(reg_width)
+                                       | DWC_CTLL_DST_FIX
+                                       | DWC_CTLL_SRC_INC
+                                       | DWC_CTLL_INT_EN);
+
+                       desc->lli.ctllo |= sconfig->device_fc ?
+                               DWC_CTLL_FC(DW_DMA_FC_P_M2P) :
+                               DWC_CTLL_FC(DW_DMA_FC_D_M2P);
+
+                       break;
+               case DMA_DEV_TO_MEM:
+                       desc->lli.dar = buf_addr + (period_len * i);
+                       desc->lli.sar = sconfig->src_addr;
+                       desc->lli.ctllo = (DWC_DEFAULT_CTLLO(chan)
+                                       | DWC_CTLL_SRC_WIDTH(reg_width)
+                                       | DWC_CTLL_DST_WIDTH(reg_width)
+                                       | DWC_CTLL_DST_INC
+                                       | DWC_CTLL_SRC_FIX
+                                       | DWC_CTLL_INT_EN);
+
+                       desc->lli.ctllo |= sconfig->device_fc ?
+                               DWC_CTLL_FC(DW_DMA_FC_P_P2M) :
+                               DWC_CTLL_FC(DW_DMA_FC_D_P2M);
+
+                       break;
+               default:
+                       break;
+               }
+
+               desc->lli.ctlhi = (period_len >> reg_width);
+               cdesc->desc[i] = desc;
+
+               if (last)
+                       last->lli.llp = desc->txd.phys;
+
+               last = desc;
+       }
+
+       /* Let's make a cyclic list */
+       last->lli.llp = cdesc->desc[0]->txd.phys;
+
+       dev_dbg(chan2dev(&dwc->chan), "cyclic prepared buf 0x%llx len %zu "
+                       "period %zu periods %d\n", (unsigned long long)buf_addr,
+                       buf_len, period_len, periods);
+
+       cdesc->periods = periods;
+       dwc->cdesc = cdesc;
+
+       return cdesc;
+
+out_err_desc_get:
+       while (i--)
+               dwc_desc_put(dwc, cdesc->desc[i]);
+out_err_alloc:
+       kfree(cdesc);
+out_err:
+       clear_bit(DW_DMA_IS_CYCLIC, &dwc->flags);
+       return (struct dw_cyclic_desc *)retval;
+}
+EXPORT_SYMBOL(dw_dma_cyclic_prep);
+
+/**
+ * dw_dma_cyclic_free - free a prepared cyclic DMA transfer
+ * @chan: the DMA channel to free
+ */
+void dw_dma_cyclic_free(struct dma_chan *chan)
+{
+       struct dw_dma_chan      *dwc = to_dw_dma_chan(chan);
+       struct dw_dma           *dw = to_dw_dma(dwc->chan.device);
+       struct dw_cyclic_desc   *cdesc = dwc->cdesc;
+       int                     i;
+       unsigned long           flags;
+
+       dev_dbg(chan2dev(&dwc->chan), "%s\n", __func__);
+
+       if (!cdesc)
+               return;
+
+       spin_lock_irqsave(&dwc->lock, flags);
+
+       dwc_chan_disable(dw, dwc);
+
+       dma_writel(dw, CLEAR.ERROR, dwc->mask);
+       dma_writel(dw, CLEAR.XFER, dwc->mask);
+
+       spin_unlock_irqrestore(&dwc->lock, flags);
+
+       for (i = 0; i < cdesc->periods; i++)
+               dwc_desc_put(dwc, cdesc->desc[i]);
+
+       kfree(cdesc->desc);
+       kfree(cdesc);
+
+       clear_bit(DW_DMA_IS_CYCLIC, &dwc->flags);
+}
+EXPORT_SYMBOL(dw_dma_cyclic_free);
+
+/*----------------------------------------------------------------------*/
+
+static void dw_dma_off(struct dw_dma *dw)
+{
+       int i;
+
+       dma_writel(dw, CFG, 0);
+
+       channel_clear_bit(dw, MASK.XFER, dw->all_chan_mask);
+       channel_clear_bit(dw, MASK.SRC_TRAN, dw->all_chan_mask);
+       channel_clear_bit(dw, MASK.DST_TRAN, dw->all_chan_mask);
+       channel_clear_bit(dw, MASK.ERROR, dw->all_chan_mask);
+
+       while (dma_readl(dw, CFG) & DW_CFG_DMA_EN)
+               cpu_relax();
+
+       for (i = 0; i < dw->dma.chancnt; i++)
+               dw->chan[i].initialized = false;
+}
+
+int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
+{
+       struct dw_dma           *dw;
+       size_t                  size;
+       bool                    autocfg;
+       unsigned int            dw_params;
+       unsigned int            nr_channels;
+       unsigned int            max_blk_size = 0;
+       int                     err;
+       int                     i;
+
+       dw_params = dma_read_byaddr(chip->regs, DW_PARAMS);
+       autocfg = dw_params >> DW_PARAMS_EN & 0x1;
+
+       dev_dbg(chip->dev, "DW_PARAMS: 0x%08x\n", dw_params);
+
+       if (!pdata && autocfg) {
+               pdata = devm_kzalloc(chip->dev, sizeof(*pdata), GFP_KERNEL);
+               if (!pdata)
+                       return -ENOMEM;
+
+               /* Fill platform data with the default values */
+               pdata->is_private = true;
+               pdata->chan_allocation_order = CHAN_ALLOCATION_ASCENDING;
+               pdata->chan_priority = CHAN_PRIORITY_ASCENDING;
+       } else if (!pdata || pdata->nr_channels > DW_DMA_MAX_NR_CHANNELS)
+               return -EINVAL;
+
+       if (autocfg)
+               nr_channels = (dw_params >> DW_PARAMS_NR_CHAN & 0x7) + 1;
+       else
+               nr_channels = pdata->nr_channels;
+
+       size = sizeof(struct dw_dma) + nr_channels * sizeof(struct dw_dma_chan);
+       dw = devm_kzalloc(chip->dev, size, GFP_KERNEL);
+       if (!dw)
+               return -ENOMEM;
+
+       dw->clk = devm_clk_get(chip->dev, "hclk");
+       if (IS_ERR(dw->clk))
+               return PTR_ERR(dw->clk);
+       clk_prepare_enable(dw->clk);
+
+       dw->regs = chip->regs;
+       chip->dw = dw;
+
+       /* Get hardware configuration parameters */
+       if (autocfg) {
+               max_blk_size = dma_readl(dw, MAX_BLK_SIZE);
+
+               dw->nr_masters = (dw_params >> DW_PARAMS_NR_MASTER & 3) + 1;
+               for (i = 0; i < dw->nr_masters; i++) {
+                       dw->data_width[i] =
+                               (dw_params >> DW_PARAMS_DATA_WIDTH(i) & 3) + 2;
+               }
+       } else {
+               dw->nr_masters = pdata->nr_masters;
+               memcpy(dw->data_width, pdata->data_width, 4);
+       }
+
+       /* Calculate all channel mask before DMA setup */
+       dw->all_chan_mask = (1 << nr_channels) - 1;
+
+       /* Force dma off, just in case */
+       dw_dma_off(dw);
+
+       /* Disable BLOCK interrupts as well */
+       channel_clear_bit(dw, MASK.BLOCK, dw->all_chan_mask);
+
+       err = devm_request_irq(chip->dev, chip->irq, dw_dma_interrupt, 0,
+                              "dw_dmac", dw);
+       if (err)
+               return err;
+
+       /* Create a pool of consistent memory blocks for hardware descriptors */
+       dw->desc_pool = dmam_pool_create("dw_dmac_desc_pool", chip->dev,
+                                        sizeof(struct dw_desc), 4, 0);
+       if (!dw->desc_pool) {
+               dev_err(chip->dev, "No memory for descriptors dma pool\n");
+               return -ENOMEM;
+       }
+
+       tasklet_init(&dw->tasklet, dw_dma_tasklet, (unsigned long)dw);
+
+       INIT_LIST_HEAD(&dw->dma.channels);
+       for (i = 0; i < nr_channels; i++) {
+               struct dw_dma_chan      *dwc = &dw->chan[i];
+               int                     r = nr_channels - i - 1;
+
+               dwc->chan.device = &dw->dma;
+               dma_cookie_init(&dwc->chan);
+               if (pdata->chan_allocation_order == CHAN_ALLOCATION_ASCENDING)
+                       list_add_tail(&dwc->chan.device_node,
+                                       &dw->dma.channels);
+               else
+                       list_add(&dwc->chan.device_node, &dw->dma.channels);
+
+               /* 7 is highest priority & 0 is lowest. */
+               if (pdata->chan_priority == CHAN_PRIORITY_ASCENDING)
+                       dwc->priority = r;
+               else
+                       dwc->priority = i;
+
+               dwc->ch_regs = &__dw_regs(dw)->CHAN[i];
+               spin_lock_init(&dwc->lock);
+               dwc->mask = 1 << i;
+
+               INIT_LIST_HEAD(&dwc->active_list);
+               INIT_LIST_HEAD(&dwc->queue);
+               INIT_LIST_HEAD(&dwc->free_list);
+
+               channel_clear_bit(dw, CH_EN, dwc->mask);
+
+               dwc->direction = DMA_TRANS_NONE;
+               dwc->request_line = ~0;
+
+               /* Hardware configuration */
+               if (autocfg) {
+                       unsigned int dwc_params;
+                       void __iomem *addr = chip->regs + r * sizeof(u32);
+
+                       dwc_params = dma_read_byaddr(addr, DWC_PARAMS);
+
+                       dev_dbg(chip->dev, "DWC_PARAMS[%d]: 0x%08x\n", i,
+                                          dwc_params);
+
+                       /* Decode maximum block size for given channel. The
+                        * stored 4 bit value represents blocks from 0x00 for 3
+                        * up to 0x0a for 4095. */
+                       dwc->block_size =
+                               (4 << ((max_blk_size >> 4 * i) & 0xf)) - 1;
+                       dwc->nollp =
+                               (dwc_params >> DWC_PARAMS_MBLK_EN & 0x1) == 0;
+               } else {
+                       dwc->block_size = pdata->block_size;
+
+                       /* Check if channel supports multi block transfer */
+                       channel_writel(dwc, LLP, 0xfffffffc);
+                       dwc->nollp =
+                               (channel_readl(dwc, LLP) & 0xfffffffc) == 0;
+                       channel_writel(dwc, LLP, 0);
+               }
+       }
+
+       /* Clear all interrupts on all channels. */
+       dma_writel(dw, CLEAR.XFER, dw->all_chan_mask);
+       dma_writel(dw, CLEAR.BLOCK, dw->all_chan_mask);
+       dma_writel(dw, CLEAR.SRC_TRAN, dw->all_chan_mask);
+       dma_writel(dw, CLEAR.DST_TRAN, dw->all_chan_mask);
+       dma_writel(dw, CLEAR.ERROR, dw->all_chan_mask);
+
+       dma_cap_set(DMA_MEMCPY, dw->dma.cap_mask);
+       dma_cap_set(DMA_SLAVE, dw->dma.cap_mask);
+       if (pdata->is_private)
+               dma_cap_set(DMA_PRIVATE, dw->dma.cap_mask);
+       dw->dma.dev = chip->dev;
+       dw->dma.device_alloc_chan_resources = dwc_alloc_chan_resources;
+       dw->dma.device_free_chan_resources = dwc_free_chan_resources;
+
+       dw->dma.device_prep_dma_memcpy = dwc_prep_dma_memcpy;
+
+       dw->dma.device_prep_slave_sg = dwc_prep_slave_sg;
+       dw->dma.device_control = dwc_control;
+
+       dw->dma.device_tx_status = dwc_tx_status;
+       dw->dma.device_issue_pending = dwc_issue_pending;
+
+       dma_writel(dw, CFG, DW_CFG_DMA_EN);
+
+       dev_info(chip->dev, "DesignWare DMA Controller, %d channels\n",
+                nr_channels);
+
+       dma_async_device_register(&dw->dma);
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(dw_dma_probe);
+
+int dw_dma_remove(struct dw_dma_chip *chip)
+{
+       struct dw_dma           *dw = chip->dw;
+       struct dw_dma_chan      *dwc, *_dwc;
+
+       dw_dma_off(dw);
+       dma_async_device_unregister(&dw->dma);
+
+       tasklet_kill(&dw->tasklet);
+
+       list_for_each_entry_safe(dwc, _dwc, &dw->dma.channels,
+                       chan.device_node) {
+               list_del(&dwc->chan.device_node);
+               channel_clear_bit(dw, CH_EN, dwc->mask);
+       }
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(dw_dma_remove);
+
+void dw_dma_shutdown(struct dw_dma_chip *chip)
+{
+       struct dw_dma *dw = chip->dw;
+
+       dw_dma_off(dw);
+       clk_disable_unprepare(dw->clk);
+}
+EXPORT_SYMBOL_GPL(dw_dma_shutdown);
+
+#ifdef CONFIG_PM_SLEEP
+
+int dw_dma_suspend(struct dw_dma_chip *chip)
+{
+       struct dw_dma *dw = chip->dw;
+
+       dw_dma_off(dw);
+       clk_disable_unprepare(dw->clk);
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(dw_dma_suspend);
+
+int dw_dma_resume(struct dw_dma_chip *chip)
+{
+       struct dw_dma *dw = chip->dw;
+
+       clk_prepare_enable(dw->clk);
+       dma_writel(dw, CFG, DW_CFG_DMA_EN);
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(dw_dma_resume);
+
+#endif /* CONFIG_PM_SLEEP */
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller core driver");
+MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
+MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>");
diff --git a/drivers/dma/dw/dw_dmac.c b/drivers/dma/dw/dw_dmac.c
deleted file mode 100644 (file)
index 15f3f4f..0000000
+++ /dev/null
@@ -1,1969 +0,0 @@
-/*
- * Core driver for the Synopsys DesignWare DMA Controller
- *
- * Copyright (C) 2007-2008 Atmel Corporation
- * Copyright (C) 2010-2011 ST Microelectronics
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/bitops.h>
-#include <linux/clk.h>
-#include <linux/delay.h>
-#include <linux/dmaengine.h>
-#include <linux/dma-mapping.h>
-#include <linux/dmapool.h>
-#include <linux/err.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/of.h>
-#include <linux/of_dma.h>
-#include <linux/mm.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/acpi.h>
-#include <linux/acpi_dma.h>
-
-#include "../dmaengine.h"
-#include "dw_dmac_regs.h"
-
-/*
- * This supports the Synopsys "DesignWare AHB Central DMA Controller",
- * (DW_ahb_dmac) which is used with various AMBA 2.0 systems (not all
- * of which use ARM any more).  See the "Databook" from Synopsys for
- * information beyond what licensees probably provide.
- *
- * The driver has currently been tested only with the Atmel AT32AP7000,
- * which does not support descriptor writeback.
- */
-
-static inline unsigned int dwc_get_dms(struct dw_dma_slave *slave)
-{
-       return slave ? slave->dst_master : 0;
-}
-
-static inline unsigned int dwc_get_sms(struct dw_dma_slave *slave)
-{
-       return slave ? slave->src_master : 1;
-}
-
-static inline void dwc_set_masters(struct dw_dma_chan *dwc)
-{
-       struct dw_dma *dw = to_dw_dma(dwc->chan.device);
-       struct dw_dma_slave *dws = dwc->chan.private;
-       unsigned char mmax = dw->nr_masters - 1;
-
-       if (dwc->request_line == ~0) {
-               dwc->src_master = min_t(unsigned char, mmax, dwc_get_sms(dws));
-               dwc->dst_master = min_t(unsigned char, mmax, dwc_get_dms(dws));
-       }
-}
-
-#define DWC_DEFAULT_CTLLO(_chan) ({                            \
-               struct dw_dma_chan *_dwc = to_dw_dma_chan(_chan);       \
-               struct dma_slave_config *_sconfig = &_dwc->dma_sconfig; \
-               bool _is_slave = is_slave_direction(_dwc->direction);   \
-               u8 _smsize = _is_slave ? _sconfig->src_maxburst :       \
-                       DW_DMA_MSIZE_16;                        \
-               u8 _dmsize = _is_slave ? _sconfig->dst_maxburst :       \
-                       DW_DMA_MSIZE_16;                        \
-                                                               \
-               (DWC_CTLL_DST_MSIZE(_dmsize)                    \
-                | DWC_CTLL_SRC_MSIZE(_smsize)                  \
-                | DWC_CTLL_LLP_D_EN                            \
-                | DWC_CTLL_LLP_S_EN                            \
-                | DWC_CTLL_DMS(_dwc->dst_master)               \
-                | DWC_CTLL_SMS(_dwc->src_master));             \
-       })
-
-/*
- * Number of descriptors to allocate for each channel. This should be
- * made configurable somehow; preferably, the clients (at least the
- * ones using slave transfers) should be able to give us a hint.
- */
-#define NR_DESCS_PER_CHANNEL   64
-
-/*----------------------------------------------------------------------*/
-
-static struct device *chan2dev(struct dma_chan *chan)
-{
-       return &chan->dev->device;
-}
-static struct device *chan2parent(struct dma_chan *chan)
-{
-       return chan->dev->device.parent;
-}
-
-static struct dw_desc *dwc_first_active(struct dw_dma_chan *dwc)
-{
-       return to_dw_desc(dwc->active_list.next);
-}
-
-static struct dw_desc *dwc_desc_get(struct dw_dma_chan *dwc)
-{
-       struct dw_desc *desc, *_desc;
-       struct dw_desc *ret = NULL;
-       unsigned int i = 0;
-       unsigned long flags;
-
-       spin_lock_irqsave(&dwc->lock, flags);
-       list_for_each_entry_safe(desc, _desc, &dwc->free_list, desc_node) {
-               i++;
-               if (async_tx_test_ack(&desc->txd)) {
-                       list_del(&desc->desc_node);
-                       ret = desc;
-                       break;
-               }
-               dev_dbg(chan2dev(&dwc->chan), "desc %p not ACKed\n", desc);
-       }
-       spin_unlock_irqrestore(&dwc->lock, flags);
-
-       dev_vdbg(chan2dev(&dwc->chan), "scanned %u descriptors on freelist\n", i);
-
-       return ret;
-}
-
-/*
- * Move a descriptor, including any children, to the free list.
- * `desc' must not be on any lists.
- */
-static void dwc_desc_put(struct dw_dma_chan *dwc, struct dw_desc *desc)
-{
-       unsigned long flags;
-
-       if (desc) {
-               struct dw_desc *child;
-
-               spin_lock_irqsave(&dwc->lock, flags);
-               list_for_each_entry(child, &desc->tx_list, desc_node)
-                       dev_vdbg(chan2dev(&dwc->chan),
-                                       "moving child desc %p to freelist\n",
-                                       child);
-               list_splice_init(&desc->tx_list, &dwc->free_list);
-               dev_vdbg(chan2dev(&dwc->chan), "moving desc %p to freelist\n", desc);
-               list_add(&desc->desc_node, &dwc->free_list);
-               spin_unlock_irqrestore(&dwc->lock, flags);
-       }
-}
-
-static void dwc_initialize(struct dw_dma_chan *dwc)
-{
-       struct dw_dma *dw = to_dw_dma(dwc->chan.device);
-       struct dw_dma_slave *dws = dwc->chan.private;
-       u32 cfghi = DWC_CFGH_FIFO_MODE;
-       u32 cfglo = DWC_CFGL_CH_PRIOR(dwc->priority);
-
-       if (dwc->initialized == true)
-               return;
-
-       if (dws) {
-               /*
-                * We need controller-specific data to set up slave
-                * transfers.
-                */
-               BUG_ON(!dws->dma_dev || dws->dma_dev != dw->dma.dev);
-
-               cfghi = dws->cfg_hi;
-               cfglo |= dws->cfg_lo & ~DWC_CFGL_CH_PRIOR_MASK;
-       } else {
-               if (dwc->direction == DMA_MEM_TO_DEV)
-                       cfghi = DWC_CFGH_DST_PER(dwc->request_line);
-               else if (dwc->direction == DMA_DEV_TO_MEM)
-                       cfghi = DWC_CFGH_SRC_PER(dwc->request_line);
-       }
-
-       channel_writel(dwc, CFG_LO, cfglo);
-       channel_writel(dwc, CFG_HI, cfghi);
-
-       /* Enable interrupts */
-       channel_set_bit(dw, MASK.XFER, dwc->mask);
-       channel_set_bit(dw, MASK.ERROR, dwc->mask);
-
-       dwc->initialized = true;
-}
-
-/*----------------------------------------------------------------------*/
-
-static inline unsigned int dwc_fast_fls(unsigned long long v)
-{
-       /*
-        * We can be a lot more clever here, but this should take care
-        * of the most common optimization.
-        */
-       if (!(v & 7))
-               return 3;
-       else if (!(v & 3))
-               return 2;
-       else if (!(v & 1))
-               return 1;
-       return 0;
-}
-
-static inline void dwc_dump_chan_regs(struct dw_dma_chan *dwc)
-{
-       dev_err(chan2dev(&dwc->chan),
-               "  SAR: 0x%x DAR: 0x%x LLP: 0x%x CTL: 0x%x:%08x\n",
-               channel_readl(dwc, SAR),
-               channel_readl(dwc, DAR),
-               channel_readl(dwc, LLP),
-               channel_readl(dwc, CTL_HI),
-               channel_readl(dwc, CTL_LO));
-}
-
-static inline void dwc_chan_disable(struct dw_dma *dw, struct dw_dma_chan *dwc)
-{
-       channel_clear_bit(dw, CH_EN, dwc->mask);
-       while (dma_readl(dw, CH_EN) & dwc->mask)
-               cpu_relax();
-}
-
-/*----------------------------------------------------------------------*/
-
-/* Perform single block transfer */
-static inline void dwc_do_single_block(struct dw_dma_chan *dwc,
-                                      struct dw_desc *desc)
-{
-       struct dw_dma   *dw = to_dw_dma(dwc->chan.device);
-       u32             ctllo;
-
-       /* Software emulation of LLP mode relies on interrupts to continue
-        * multi block transfer. */
-       ctllo = desc->lli.ctllo | DWC_CTLL_INT_EN;
-
-       channel_writel(dwc, SAR, desc->lli.sar);
-       channel_writel(dwc, DAR, desc->lli.dar);
-       channel_writel(dwc, CTL_LO, ctllo);
-       channel_writel(dwc, CTL_HI, desc->lli.ctlhi);
-       channel_set_bit(dw, CH_EN, dwc->mask);
-
-       /* Move pointer to next descriptor */
-       dwc->tx_node_active = dwc->tx_node_active->next;
-}
-
-/* Called with dwc->lock held and bh disabled */
-static void dwc_dostart(struct dw_dma_chan *dwc, struct dw_desc *first)
-{
-       struct dw_dma   *dw = to_dw_dma(dwc->chan.device);
-       unsigned long   was_soft_llp;
-
-       /* ASSERT:  channel is idle */
-       if (dma_readl(dw, CH_EN) & dwc->mask) {
-               dev_err(chan2dev(&dwc->chan),
-                       "BUG: Attempted to start non-idle channel\n");
-               dwc_dump_chan_regs(dwc);
-
-               /* The tasklet will hopefully advance the queue... */
-               return;
-       }
-
-       if (dwc->nollp) {
-               was_soft_llp = test_and_set_bit(DW_DMA_IS_SOFT_LLP,
-                                               &dwc->flags);
-               if (was_soft_llp) {
-                       dev_err(chan2dev(&dwc->chan),
-                               "BUG: Attempted to start new LLP transfer "
-                               "inside ongoing one\n");
-                       return;
-               }
-
-               dwc_initialize(dwc);
-
-               dwc->residue = first->total_len;
-               dwc->tx_node_active = &first->tx_list;
-
-               /* Submit first block */
-               dwc_do_single_block(dwc, first);
-
-               return;
-       }
-
-       dwc_initialize(dwc);
-
-       channel_writel(dwc, LLP, first->txd.phys);
-       channel_writel(dwc, CTL_LO,
-                       DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN);
-       channel_writel(dwc, CTL_HI, 0);
-       channel_set_bit(dw, CH_EN, dwc->mask);
-}
-
-/*----------------------------------------------------------------------*/
-
-static void
-dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc,
-               bool callback_required)
-{
-       dma_async_tx_callback           callback = NULL;
-       void                            *param = NULL;
-       struct dma_async_tx_descriptor  *txd = &desc->txd;
-       struct dw_desc                  *child;
-       unsigned long                   flags;
-
-       dev_vdbg(chan2dev(&dwc->chan), "descriptor %u complete\n", txd->cookie);
-
-       spin_lock_irqsave(&dwc->lock, flags);
-       dma_cookie_complete(txd);
-       if (callback_required) {
-               callback = txd->callback;
-               param = txd->callback_param;
-       }
-
-       /* async_tx_ack */
-       list_for_each_entry(child, &desc->tx_list, desc_node)
-               async_tx_ack(&child->txd);
-       async_tx_ack(&desc->txd);
-
-       list_splice_init(&desc->tx_list, &dwc->free_list);
-       list_move(&desc->desc_node, &dwc->free_list);
-
-       if (!is_slave_direction(dwc->direction)) {
-               struct device *parent = chan2parent(&dwc->chan);
-               if (!(txd->flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
-                       if (txd->flags & DMA_COMPL_DEST_UNMAP_SINGLE)
-                               dma_unmap_single(parent, desc->lli.dar,
-                                       desc->total_len, DMA_FROM_DEVICE);
-                       else
-                               dma_unmap_page(parent, desc->lli.dar,
-                                       desc->total_len, DMA_FROM_DEVICE);
-               }
-               if (!(txd->flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
-                       if (txd->flags & DMA_COMPL_SRC_UNMAP_SINGLE)
-                               dma_unmap_single(parent, desc->lli.sar,
-                                       desc->total_len, DMA_TO_DEVICE);
-                       else
-                               dma_unmap_page(parent, desc->lli.sar,
-                                       desc->total_len, DMA_TO_DEVICE);
-               }
-       }
-
-       spin_unlock_irqrestore(&dwc->lock, flags);
-
-       if (callback)
-               callback(param);
-}
-
-static void dwc_complete_all(struct dw_dma *dw, struct dw_dma_chan *dwc)
-{
-       struct dw_desc *desc, *_desc;
-       LIST_HEAD(list);
-       unsigned long flags;
-
-       spin_lock_irqsave(&dwc->lock, flags);
-       if (dma_readl(dw, CH_EN) & dwc->mask) {
-               dev_err(chan2dev(&dwc->chan),
-                       "BUG: XFER bit set, but channel not idle!\n");
-
-               /* Try to continue after resetting the channel... */
-               dwc_chan_disable(dw, dwc);
-       }
-
-       /*
-        * Submit queued descriptors ASAP, i.e. before we go through
-        * the completed ones.
-        */
-       list_splice_init(&dwc->active_list, &list);
-       if (!list_empty(&dwc->queue)) {
-               list_move(dwc->queue.next, &dwc->active_list);
-               dwc_dostart(dwc, dwc_first_active(dwc));
-       }
-
-       spin_unlock_irqrestore(&dwc->lock, flags);
-
-       list_for_each_entry_safe(desc, _desc, &list, desc_node)
-               dwc_descriptor_complete(dwc, desc, true);
-}
-
-/* Returns how many bytes were already received from source */
-static inline u32 dwc_get_sent(struct dw_dma_chan *dwc)
-{
-       u32 ctlhi = channel_readl(dwc, CTL_HI);
-       u32 ctllo = channel_readl(dwc, CTL_LO);
-
-       return (ctlhi & DWC_CTLH_BLOCK_TS_MASK) * (1 << (ctllo >> 4 & 7));
-}
-
-static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
-{
-       dma_addr_t llp;
-       struct dw_desc *desc, *_desc;
-       struct dw_desc *child;
-       u32 status_xfer;
-       unsigned long flags;
-
-       spin_lock_irqsave(&dwc->lock, flags);
-       llp = channel_readl(dwc, LLP);
-       status_xfer = dma_readl(dw, RAW.XFER);
-
-       if (status_xfer & dwc->mask) {
-               /* Everything we've submitted is done */
-               dma_writel(dw, CLEAR.XFER, dwc->mask);
-
-               if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags)) {
-                       struct list_head *head, *active = dwc->tx_node_active;
-
-                       /*
-                        * We are inside first active descriptor.
-                        * Otherwise something is really wrong.
-                        */
-                       desc = dwc_first_active(dwc);
-
-                       head = &desc->tx_list;
-                       if (active != head) {
-                               /* Update desc to reflect last sent one */
-                               if (active != head->next)
-                                       desc = to_dw_desc(active->prev);
-
-                               dwc->residue -= desc->len;
-
-                               child = to_dw_desc(active);
-
-                               /* Submit next block */
-                               dwc_do_single_block(dwc, child);
-
-                               spin_unlock_irqrestore(&dwc->lock, flags);
-                               return;
-                       }
-
-                       /* We are done here */
-                       clear_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags);
-               }
-
-               dwc->residue = 0;
-
-               spin_unlock_irqrestore(&dwc->lock, flags);
-
-               dwc_complete_all(dw, dwc);
-               return;
-       }
-
-       if (list_empty(&dwc->active_list)) {
-               dwc->residue = 0;
-               spin_unlock_irqrestore(&dwc->lock, flags);
-               return;
-       }
-
-       if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags)) {
-               dev_vdbg(chan2dev(&dwc->chan), "%s: soft LLP mode\n", __func__);
-               spin_unlock_irqrestore(&dwc->lock, flags);
-               return;
-       }
-
-       dev_vdbg(chan2dev(&dwc->chan), "%s: llp=0x%llx\n", __func__,
-                       (unsigned long long)llp);
-
-       list_for_each_entry_safe(desc, _desc, &dwc->active_list, desc_node) {
-               /* Initial residue value */
-               dwc->residue = desc->total_len;
-
-               /* Check first descriptors addr */
-               if (desc->txd.phys == llp) {
-                       spin_unlock_irqrestore(&dwc->lock, flags);
-                       return;
-               }
-
-               /* Check first descriptors llp */
-               if (desc->lli.llp == llp) {
-                       /* This one is currently in progress */
-                       dwc->residue -= dwc_get_sent(dwc);
-                       spin_unlock_irqrestore(&dwc->lock, flags);
-                       return;
-               }
-
-               dwc->residue -= desc->len;
-               list_for_each_entry(child, &desc->tx_list, desc_node) {
-                       if (child->lli.llp == llp) {
-                               /* Currently in progress */
-                               dwc->residue -= dwc_get_sent(dwc);
-                               spin_unlock_irqrestore(&dwc->lock, flags);
-                               return;
-                       }
-                       dwc->residue -= child->len;
-               }
-
-               /*
-                * No descriptors so far seem to be in progress, i.e.
-                * this one must be done.
-                */
-               spin_unlock_irqrestore(&dwc->lock, flags);
-               dwc_descriptor_complete(dwc, desc, true);
-               spin_lock_irqsave(&dwc->lock, flags);
-       }
-
-       dev_err(chan2dev(&dwc->chan),
-               "BUG: All descriptors done, but channel not idle!\n");
-
-       /* Try to continue after resetting the channel... */
-       dwc_chan_disable(dw, dwc);
-
-       if (!list_empty(&dwc->queue)) {
-               list_move(dwc->queue.next, &dwc->active_list);
-               dwc_dostart(dwc, dwc_first_active(dwc));
-       }
-       spin_unlock_irqrestore(&dwc->lock, flags);
-}
-
-static inline void dwc_dump_lli(struct dw_dma_chan *dwc, struct dw_lli *lli)
-{
-       dev_crit(chan2dev(&dwc->chan), "  desc: s0x%x d0x%x l0x%x c0x%x:%x\n",
-                lli->sar, lli->dar, lli->llp, lli->ctlhi, lli->ctllo);
-}
-
-static void dwc_handle_error(struct dw_dma *dw, struct dw_dma_chan *dwc)
-{
-       struct dw_desc *bad_desc;
-       struct dw_desc *child;
-       unsigned long flags;
-
-       dwc_scan_descriptors(dw, dwc);
-
-       spin_lock_irqsave(&dwc->lock, flags);
-
-       /*
-        * The descriptor currently at the head of the active list is
-        * borked. Since we don't have any way to report errors, we'll
-        * just have to scream loudly and try to carry on.
-        */
-       bad_desc = dwc_first_active(dwc);
-       list_del_init(&bad_desc->desc_node);
-       list_move(dwc->queue.next, dwc->active_list.prev);
-
-       /* Clear the error flag and try to restart the controller */
-       dma_writel(dw, CLEAR.ERROR, dwc->mask);
-       if (!list_empty(&dwc->active_list))
-               dwc_dostart(dwc, dwc_first_active(dwc));
-
-       /*
-        * WARN may seem harsh, but since this only happens
-        * when someone submits a bad physical address in a
-        * descriptor, we should consider ourselves lucky that the
-        * controller flagged an error instead of scribbling over
-        * random memory locations.
-        */
-       dev_WARN(chan2dev(&dwc->chan), "Bad descriptor submitted for DMA!\n"
-                                      "  cookie: %d\n", bad_desc->txd.cookie);
-       dwc_dump_lli(dwc, &bad_desc->lli);
-       list_for_each_entry(child, &bad_desc->tx_list, desc_node)
-               dwc_dump_lli(dwc, &child->lli);
-
-       spin_unlock_irqrestore(&dwc->lock, flags);
-
-       /* Pretend the descriptor completed successfully */
-       dwc_descriptor_complete(dwc, bad_desc, true);
-}
-
-/* --------------------- Cyclic DMA API extensions -------------------- */
-
-dma_addr_t dw_dma_get_src_addr(struct dma_chan *chan)
-{
-       struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
-       return channel_readl(dwc, SAR);
-}
-EXPORT_SYMBOL(dw_dma_get_src_addr);
-
-dma_addr_t dw_dma_get_dst_addr(struct dma_chan *chan)
-{
-       struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
-       return channel_readl(dwc, DAR);
-}
-EXPORT_SYMBOL(dw_dma_get_dst_addr);
-
-/* Called with dwc->lock held and all DMAC interrupts disabled */
-static void dwc_handle_cyclic(struct dw_dma *dw, struct dw_dma_chan *dwc,
-               u32 status_err, u32 status_xfer)
-{
-       unsigned long flags;
-
-       if (dwc->mask) {
-               void (*callback)(void *param);
-               void *callback_param;
-
-               dev_vdbg(chan2dev(&dwc->chan), "new cyclic period llp 0x%08x\n",
-                               channel_readl(dwc, LLP));
-
-               callback = dwc->cdesc->period_callback;
-               callback_param = dwc->cdesc->period_callback_param;
-
-               if (callback)
-                       callback(callback_param);
-       }
-
-       /*
-        * Error and transfer complete are highly unlikely, and will most
-        * likely be due to a configuration error by the user.
-        */
-       if (unlikely(status_err & dwc->mask) ||
-                       unlikely(status_xfer & dwc->mask)) {
-               int i;
-
-               dev_err(chan2dev(&dwc->chan), "cyclic DMA unexpected %s "
-                               "interrupt, stopping DMA transfer\n",
-                               status_xfer ? "xfer" : "error");
-
-               spin_lock_irqsave(&dwc->lock, flags);
-
-               dwc_dump_chan_regs(dwc);
-
-               dwc_chan_disable(dw, dwc);
-
-               /* Make sure DMA does not restart by loading a new list */
-               channel_writel(dwc, LLP, 0);
-               channel_writel(dwc, CTL_LO, 0);
-               channel_writel(dwc, CTL_HI, 0);
-
-               dma_writel(dw, CLEAR.ERROR, dwc->mask);
-               dma_writel(dw, CLEAR.XFER, dwc->mask);
-
-               for (i = 0; i < dwc->cdesc->periods; i++)
-                       dwc_dump_lli(dwc, &dwc->cdesc->desc[i]->lli);
-
-               spin_unlock_irqrestore(&dwc->lock, flags);
-       }
-}
-
-/* ------------------------------------------------------------------------- */
-
-static void dw_dma_tasklet(unsigned long data)
-{
-       struct dw_dma *dw = (struct dw_dma *)data;
-       struct dw_dma_chan *dwc;
-       u32 status_xfer;
-       u32 status_err;
-       int i;
-
-       status_xfer = dma_readl(dw, RAW.XFER);
-       status_err = dma_readl(dw, RAW.ERROR);
-
-       dev_vdbg(dw->dma.dev, "%s: status_err=%x\n", __func__, status_err);
-
-       for (i = 0; i < dw->dma.chancnt; i++) {
-               dwc = &dw->chan[i];
-               if (test_bit(DW_DMA_IS_CYCLIC, &dwc->flags))
-                       dwc_handle_cyclic(dw, dwc, status_err, status_xfer);
-               else if (status_err & (1 << i))
-                       dwc_handle_error(dw, dwc);
-               else if (status_xfer & (1 << i))
-                       dwc_scan_descriptors(dw, dwc);
-       }
-
-       /*
-        * Re-enable interrupts.
-        */
-       channel_set_bit(dw, MASK.XFER, dw->all_chan_mask);
-       channel_set_bit(dw, MASK.ERROR, dw->all_chan_mask);
-}
-
-static irqreturn_t dw_dma_interrupt(int irq, void *dev_id)
-{
-       struct dw_dma *dw = dev_id;
-       u32 status;
-
-       dev_vdbg(dw->dma.dev, "%s: status=0x%x\n", __func__,
-                       dma_readl(dw, STATUS_INT));
-
-       /*
-        * Just disable the interrupts. We'll turn them back on in the
-        * softirq handler.
-        */
-       channel_clear_bit(dw, MASK.XFER, dw->all_chan_mask);
-       channel_clear_bit(dw, MASK.ERROR, dw->all_chan_mask);
-
-       status = dma_readl(dw, STATUS_INT);
-       if (status) {
-               dev_err(dw->dma.dev,
-                       "BUG: Unexpected interrupts pending: 0x%x\n",
-                       status);
-
-               /* Try to recover */
-               channel_clear_bit(dw, MASK.XFER, (1 << 8) - 1);
-               channel_clear_bit(dw, MASK.SRC_TRAN, (1 << 8) - 1);
-               channel_clear_bit(dw, MASK.DST_TRAN, (1 << 8) - 1);
-               channel_clear_bit(dw, MASK.ERROR, (1 << 8) - 1);
-       }
-
-       tasklet_schedule(&dw->tasklet);
-
-       return IRQ_HANDLED;
-}
-
-/*----------------------------------------------------------------------*/
-
-static dma_cookie_t dwc_tx_submit(struct dma_async_tx_descriptor *tx)
-{
-       struct dw_desc          *desc = txd_to_dw_desc(tx);
-       struct dw_dma_chan      *dwc = to_dw_dma_chan(tx->chan);
-       dma_cookie_t            cookie;
-       unsigned long           flags;
-
-       spin_lock_irqsave(&dwc->lock, flags);
-       cookie = dma_cookie_assign(tx);
-
-       /*
-        * REVISIT: We should attempt to chain as many descriptors as
-        * possible, perhaps even appending to those already submitted
-        * for DMA. But this is hard to do in a race-free manner.
-        */
-       if (list_empty(&dwc->active_list)) {
-               dev_vdbg(chan2dev(tx->chan), "%s: started %u\n", __func__,
-                               desc->txd.cookie);
-               list_add_tail(&desc->desc_node, &dwc->active_list);
-               dwc_dostart(dwc, dwc_first_active(dwc));
-       } else {
-               dev_vdbg(chan2dev(tx->chan), "%s: queued %u\n", __func__,
-                               desc->txd.cookie);
-
-               list_add_tail(&desc->desc_node, &dwc->queue);
-       }
-
-       spin_unlock_irqrestore(&dwc->lock, flags);
-
-       return cookie;
-}
-
-static struct dma_async_tx_descriptor *
-dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
-               size_t len, unsigned long flags)
-{
-       struct dw_dma_chan      *dwc = to_dw_dma_chan(chan);
-       struct dw_dma           *dw = to_dw_dma(chan->device);
-       struct dw_desc          *desc;
-       struct dw_desc          *first;
-       struct dw_desc          *prev;
-       size_t                  xfer_count;
-       size_t                  offset;
-       unsigned int            src_width;
-       unsigned int            dst_width;
-       unsigned int            data_width;
-       u32                     ctllo;
-
-       dev_vdbg(chan2dev(chan),
-                       "%s: d0x%llx s0x%llx l0x%zx f0x%lx\n", __func__,
-                       (unsigned long long)dest, (unsigned long long)src,
-                       len, flags);
-
-       if (unlikely(!len)) {
-               dev_dbg(chan2dev(chan), "%s: length is zero!\n", __func__);
-               return NULL;
-       }
-
-       dwc->direction = DMA_MEM_TO_MEM;
-
-       data_width = min_t(unsigned int, dw->data_width[dwc->src_master],
-                          dw->data_width[dwc->dst_master]);
-
-       src_width = dst_width = min_t(unsigned int, data_width,
-                                     dwc_fast_fls(src | dest | len));
-
-       ctllo = DWC_DEFAULT_CTLLO(chan)
-                       | DWC_CTLL_DST_WIDTH(dst_width)
-                       | DWC_CTLL_SRC_WIDTH(src_width)
-                       | DWC_CTLL_DST_INC
-                       | DWC_CTLL_SRC_INC
-                       | DWC_CTLL_FC_M2M;
-       prev = first = NULL;
-
-       for (offset = 0; offset < len; offset += xfer_count << src_width) {
-               xfer_count = min_t(size_t, (len - offset) >> src_width,
-                                          dwc->block_size);
-
-               desc = dwc_desc_get(dwc);
-               if (!desc)
-                       goto err_desc_get;
-
-               desc->lli.sar = src + offset;
-               desc->lli.dar = dest + offset;
-               desc->lli.ctllo = ctllo;
-               desc->lli.ctlhi = xfer_count;
-               desc->len = xfer_count << src_width;
-
-               if (!first) {
-                       first = desc;
-               } else {
-                       prev->lli.llp = desc->txd.phys;
-                       list_add_tail(&desc->desc_node,
-                                       &first->tx_list);
-               }
-               prev = desc;
-       }
-
-       if (flags & DMA_PREP_INTERRUPT)
-               /* Trigger interrupt after last block */
-               prev->lli.ctllo |= DWC_CTLL_INT_EN;
-
-       prev->lli.llp = 0;
-       first->txd.flags = flags;
-       first->total_len = len;
-
-       return &first->txd;
-
-err_desc_get:
-       dwc_desc_put(dwc, first);
-       return NULL;
-}
-
-static struct dma_async_tx_descriptor *
-dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
-               unsigned int sg_len, enum dma_transfer_direction direction,
-               unsigned long flags, void *context)
-{
-       struct dw_dma_chan      *dwc = to_dw_dma_chan(chan);
-       struct dw_dma           *dw = to_dw_dma(chan->device);
-       struct dma_slave_config *sconfig = &dwc->dma_sconfig;
-       struct dw_desc          *prev;
-       struct dw_desc          *first;
-       u32                     ctllo;
-       dma_addr_t              reg;
-       unsigned int            reg_width;
-       unsigned int            mem_width;
-       unsigned int            data_width;
-       unsigned int            i;
-       struct scatterlist      *sg;
-       size_t                  total_len = 0;
-
-       dev_vdbg(chan2dev(chan), "%s\n", __func__);
-
-       if (unlikely(!is_slave_direction(direction) || !sg_len))
-               return NULL;
-
-       dwc->direction = direction;
-
-       prev = first = NULL;
-
-       switch (direction) {
-       case DMA_MEM_TO_DEV:
-               reg_width = __fls(sconfig->dst_addr_width);
-               reg = sconfig->dst_addr;
-               ctllo = (DWC_DEFAULT_CTLLO(chan)
-                               | DWC_CTLL_DST_WIDTH(reg_width)
-                               | DWC_CTLL_DST_FIX
-                               | DWC_CTLL_SRC_INC);
-
-               ctllo |= sconfig->device_fc ? DWC_CTLL_FC(DW_DMA_FC_P_M2P) :
-                       DWC_CTLL_FC(DW_DMA_FC_D_M2P);
-
-               data_width = dw->data_width[dwc->src_master];
-
-               for_each_sg(sgl, sg, sg_len, i) {
-                       struct dw_desc  *desc;
-                       u32             len, dlen, mem;
-
-                       mem = sg_dma_address(sg);
-                       len = sg_dma_len(sg);
-
-                       mem_width = min_t(unsigned int,
-                                         data_width, dwc_fast_fls(mem | len));
-
-slave_sg_todev_fill_desc:
-                       desc = dwc_desc_get(dwc);
-                       if (!desc) {
-                               dev_err(chan2dev(chan),
-                                       "not enough descriptors available\n");
-                               goto err_desc_get;
-                       }
-
-                       desc->lli.sar = mem;
-                       desc->lli.dar = reg;
-                       desc->lli.ctllo = ctllo | DWC_CTLL_SRC_WIDTH(mem_width);
-                       if ((len >> mem_width) > dwc->block_size) {
-                               dlen = dwc->block_size << mem_width;
-                               mem += dlen;
-                               len -= dlen;
-                       } else {
-                               dlen = len;
-                               len = 0;
-                       }
-
-                       desc->lli.ctlhi = dlen >> mem_width;
-                       desc->len = dlen;
-
-                       if (!first) {
-                               first = desc;
-                       } else {
-                               prev->lli.llp = desc->txd.phys;
-                               list_add_tail(&desc->desc_node,
-                                               &first->tx_list);
-                       }
-                       prev = desc;
-                       total_len += dlen;
-
-                       if (len)
-                               goto slave_sg_todev_fill_desc;
-               }
-               break;
-       case DMA_DEV_TO_MEM:
-               reg_width = __fls(sconfig->src_addr_width);
-               reg = sconfig->src_addr;
-               ctllo = (DWC_DEFAULT_CTLLO(chan)
-                               | DWC_CTLL_SRC_WIDTH(reg_width)
-                               | DWC_CTLL_DST_INC
-                               | DWC_CTLL_SRC_FIX);
-
-               ctllo |= sconfig->device_fc ? DWC_CTLL_FC(DW_DMA_FC_P_P2M) :
-                       DWC_CTLL_FC(DW_DMA_FC_D_P2M);
-
-               data_width = dw->data_width[dwc->dst_master];
-
-               for_each_sg(sgl, sg, sg_len, i) {
-                       struct dw_desc  *desc;
-                       u32             len, dlen, mem;
-
-                       mem = sg_dma_address(sg);
-                       len = sg_dma_len(sg);
-
-                       mem_width = min_t(unsigned int,
-                                         data_width, dwc_fast_fls(mem | len));
-
-slave_sg_fromdev_fill_desc:
-                       desc = dwc_desc_get(dwc);
-                       if (!desc) {
-                               dev_err(chan2dev(chan),
-                                               "not enough descriptors available\n");
-                               goto err_desc_get;
-                       }
-
-                       desc->lli.sar = reg;
-                       desc->lli.dar = mem;
-                       desc->lli.ctllo = ctllo | DWC_CTLL_DST_WIDTH(mem_width);
-                       if ((len >> reg_width) > dwc->block_size) {
-                               dlen = dwc->block_size << reg_width;
-                               mem += dlen;
-                               len -= dlen;
-                       } else {
-                               dlen = len;
-                               len = 0;
-                       }
-                       desc->lli.ctlhi = dlen >> reg_width;
-                       desc->len = dlen;
-
-                       if (!first) {
-                               first = desc;
-                       } else {
-                               prev->lli.llp = desc->txd.phys;
-                               list_add_tail(&desc->desc_node,
-                                               &first->tx_list);
-                       }
-                       prev = desc;
-                       total_len += dlen;
-
-                       if (len)
-                               goto slave_sg_fromdev_fill_desc;
-               }
-               break;
-       default:
-               return NULL;
-       }
-
-       if (flags & DMA_PREP_INTERRUPT)
-               /* Trigger interrupt after last block */
-               prev->lli.ctllo |= DWC_CTLL_INT_EN;
-
-       prev->lli.llp = 0;
-       first->total_len = total_len;
-
-       return &first->txd;
-
-err_desc_get:
-       dwc_desc_put(dwc, first);
-       return NULL;
-}
-
-/*
- * Fix sconfig's burst size according to dw_dmac. We need to convert them as:
- * 1 -> 0, 4 -> 1, 8 -> 2, 16 -> 3.
- *
- * NOTE: burst size 2 is not supported by controller.
- *
- * This can be done by finding least significant bit set: n & (n - 1)
- */
-static inline void convert_burst(u32 *maxburst)
-{
-       if (*maxburst > 1)
-               *maxburst = fls(*maxburst) - 2;
-       else
-               *maxburst = 0;
-}
-
-static int
-set_runtime_config(struct dma_chan *chan, struct dma_slave_config *sconfig)
-{
-       struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
-
-       /* Check if chan will be configured for slave transfers */
-       if (!is_slave_direction(sconfig->direction))
-               return -EINVAL;
-
-       memcpy(&dwc->dma_sconfig, sconfig, sizeof(*sconfig));
-       dwc->direction = sconfig->direction;
-
-       /* Take the request line from slave_id member */
-       if (dwc->request_line == ~0)
-               dwc->request_line = sconfig->slave_id;
-
-       convert_burst(&dwc->dma_sconfig.src_maxburst);
-       convert_burst(&dwc->dma_sconfig.dst_maxburst);
-
-       return 0;
-}
-
-static inline void dwc_chan_pause(struct dw_dma_chan *dwc)
-{
-       u32 cfglo = channel_readl(dwc, CFG_LO);
-       unsigned int count = 20;        /* timeout iterations */
-
-       channel_writel(dwc, CFG_LO, cfglo | DWC_CFGL_CH_SUSP);
-       while (!(channel_readl(dwc, CFG_LO) & DWC_CFGL_FIFO_EMPTY) && count--)
-               udelay(2);
-
-       dwc->paused = true;
-}
-
-static inline void dwc_chan_resume(struct dw_dma_chan *dwc)
-{
-       u32 cfglo = channel_readl(dwc, CFG_LO);
-
-       channel_writel(dwc, CFG_LO, cfglo & ~DWC_CFGL_CH_SUSP);
-
-       dwc->paused = false;
-}
-
-static int dwc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
-                      unsigned long arg)
-{
-       struct dw_dma_chan      *dwc = to_dw_dma_chan(chan);
-       struct dw_dma           *dw = to_dw_dma(chan->device);
-       struct dw_desc          *desc, *_desc;
-       unsigned long           flags;
-       LIST_HEAD(list);
-
-       if (cmd == DMA_PAUSE) {
-               spin_lock_irqsave(&dwc->lock, flags);
-
-               dwc_chan_pause(dwc);
-
-               spin_unlock_irqrestore(&dwc->lock, flags);
-       } else if (cmd == DMA_RESUME) {
-               if (!dwc->paused)
-                       return 0;
-
-               spin_lock_irqsave(&dwc->lock, flags);
-
-               dwc_chan_resume(dwc);
-
-               spin_unlock_irqrestore(&dwc->lock, flags);
-       } else if (cmd == DMA_TERMINATE_ALL) {
-               spin_lock_irqsave(&dwc->lock, flags);
-
-               clear_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags);
-
-               dwc_chan_disable(dw, dwc);
-
-               dwc_chan_resume(dwc);
-
-               /* active_list entries will end up before queued entries */
-               list_splice_init(&dwc->queue, &list);
-               list_splice_init(&dwc->active_list, &list);
-
-               spin_unlock_irqrestore(&dwc->lock, flags);
-
-               /* Flush all pending and queued descriptors */
-               list_for_each_entry_safe(desc, _desc, &list, desc_node)
-                       dwc_descriptor_complete(dwc, desc, false);
-       } else if (cmd == DMA_SLAVE_CONFIG) {
-               return set_runtime_config(chan, (struct dma_slave_config *)arg);
-       } else {
-               return -ENXIO;
-       }
-
-       return 0;
-}
-
-static inline u32 dwc_get_residue(struct dw_dma_chan *dwc)
-{
-       unsigned long flags;
-       u32 residue;
-
-       spin_lock_irqsave(&dwc->lock, flags);
-
-       residue = dwc->residue;
-       if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags) && residue)
-               residue -= dwc_get_sent(dwc);
-
-       spin_unlock_irqrestore(&dwc->lock, flags);
-       return residue;
-}
-
-static enum dma_status
-dwc_tx_status(struct dma_chan *chan,
-             dma_cookie_t cookie,
-             struct dma_tx_state *txstate)
-{
-       struct dw_dma_chan      *dwc = to_dw_dma_chan(chan);
-       enum dma_status         ret;
-
-       ret = dma_cookie_status(chan, cookie, txstate);
-       if (ret != DMA_SUCCESS) {
-               dwc_scan_descriptors(to_dw_dma(chan->device), dwc);
-
-               ret = dma_cookie_status(chan, cookie, txstate);
-       }
-
-       if (ret != DMA_SUCCESS)
-               dma_set_residue(txstate, dwc_get_residue(dwc));
-
-       if (dwc->paused)
-               return DMA_PAUSED;
-
-       return ret;
-}
-
-static void dwc_issue_pending(struct dma_chan *chan)
-{
-       struct dw_dma_chan      *dwc = to_dw_dma_chan(chan);
-
-       if (!list_empty(&dwc->queue))
-               dwc_scan_descriptors(to_dw_dma(chan->device), dwc);
-}
-
-static int dwc_alloc_chan_resources(struct dma_chan *chan)
-{
-       struct dw_dma_chan      *dwc = to_dw_dma_chan(chan);
-       struct dw_dma           *dw = to_dw_dma(chan->device);
-       struct dw_desc          *desc;
-       int                     i;
-       unsigned long           flags;
-
-       dev_vdbg(chan2dev(chan), "%s\n", __func__);
-
-       /* ASSERT:  channel is idle */
-       if (dma_readl(dw, CH_EN) & dwc->mask) {
-               dev_dbg(chan2dev(chan), "DMA channel not idle?\n");
-               return -EIO;
-       }
-
-       dma_cookie_init(chan);
-
-       /*
-        * NOTE: some controllers may have additional features that we
-        * need to initialize here, like "scatter-gather" (which
-        * doesn't mean what you think it means), and status writeback.
-        */
-
-       dwc_set_masters(dwc);
-
-       spin_lock_irqsave(&dwc->lock, flags);
-       i = dwc->descs_allocated;
-       while (dwc->descs_allocated < NR_DESCS_PER_CHANNEL) {
-               dma_addr_t phys;
-
-               spin_unlock_irqrestore(&dwc->lock, flags);
-
-               desc = dma_pool_alloc(dw->desc_pool, GFP_ATOMIC, &phys);
-               if (!desc)
-                       goto err_desc_alloc;
-
-               memset(desc, 0, sizeof(struct dw_desc));
-
-               INIT_LIST_HEAD(&desc->tx_list);
-               dma_async_tx_descriptor_init(&desc->txd, chan);
-               desc->txd.tx_submit = dwc_tx_submit;
-               desc->txd.flags = DMA_CTRL_ACK;
-               desc->txd.phys = phys;
-
-               dwc_desc_put(dwc, desc);
-
-               spin_lock_irqsave(&dwc->lock, flags);
-               i = ++dwc->descs_allocated;
-       }
-
-       spin_unlock_irqrestore(&dwc->lock, flags);
-
-       dev_dbg(chan2dev(chan), "%s: allocated %d descriptors\n", __func__, i);
-
-       return i;
-
-err_desc_alloc:
-       dev_info(chan2dev(chan), "only allocated %d descriptors\n", i);
-
-       return i;
-}
-
-static void dwc_free_chan_resources(struct dma_chan *chan)
-{
-       struct dw_dma_chan      *dwc = to_dw_dma_chan(chan);
-       struct dw_dma           *dw = to_dw_dma(chan->device);
-       struct dw_desc          *desc, *_desc;
-       unsigned long           flags;
-       LIST_HEAD(list);
-
-       dev_dbg(chan2dev(chan), "%s: descs allocated=%u\n", __func__,
-                       dwc->descs_allocated);
-
-       /* ASSERT:  channel is idle */
-       BUG_ON(!list_empty(&dwc->active_list));
-       BUG_ON(!list_empty(&dwc->queue));
-       BUG_ON(dma_readl(to_dw_dma(chan->device), CH_EN) & dwc->mask);
-
-       spin_lock_irqsave(&dwc->lock, flags);
-       list_splice_init(&dwc->free_list, &list);
-       dwc->descs_allocated = 0;
-       dwc->initialized = false;
-       dwc->request_line = ~0;
-
-       /* Disable interrupts */
-       channel_clear_bit(dw, MASK.XFER, dwc->mask);
-       channel_clear_bit(dw, MASK.ERROR, dwc->mask);
-
-       spin_unlock_irqrestore(&dwc->lock, flags);
-
-       list_for_each_entry_safe(desc, _desc, &list, desc_node) {
-               dev_vdbg(chan2dev(chan), "  freeing descriptor %p\n", desc);
-               dma_pool_free(dw->desc_pool, desc, desc->txd.phys);
-       }
-
-       dev_vdbg(chan2dev(chan), "%s: done\n", __func__);
-}
-
-/*----------------------------------------------------------------------*/
-
-struct dw_dma_of_filter_args {
-       struct dw_dma *dw;
-       unsigned int req;
-       unsigned int src;
-       unsigned int dst;
-};
-
-static bool dw_dma_of_filter(struct dma_chan *chan, void *param)
-{
-       struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
-       struct dw_dma_of_filter_args *fargs = param;
-
-       /* Ensure the device matches our channel */
-        if (chan->device != &fargs->dw->dma)
-                return false;
-
-       dwc->request_line = fargs->req;
-       dwc->src_master = fargs->src;
-       dwc->dst_master = fargs->dst;
-
-       return true;
-}
-
-static struct dma_chan *dw_dma_of_xlate(struct of_phandle_args *dma_spec,
-                                       struct of_dma *ofdma)
-{
-       struct dw_dma *dw = ofdma->of_dma_data;
-       struct dw_dma_of_filter_args fargs = {
-               .dw = dw,
-       };
-       dma_cap_mask_t cap;
-
-       if (dma_spec->args_count != 3)
-               return NULL;
-
-       fargs.req = dma_spec->args[0];
-       fargs.src = dma_spec->args[1];
-       fargs.dst = dma_spec->args[2];
-
-       if (WARN_ON(fargs.req >= DW_DMA_MAX_NR_REQUESTS ||
-                   fargs.src >= dw->nr_masters ||
-                   fargs.dst >= dw->nr_masters))
-               return NULL;
-
-       dma_cap_zero(cap);
-       dma_cap_set(DMA_SLAVE, cap);
-
-       /* TODO: there should be a simpler way to do this */
-       return dma_request_channel(cap, dw_dma_of_filter, &fargs);
-}
-
-#ifdef CONFIG_ACPI
-static bool dw_dma_acpi_filter(struct dma_chan *chan, void *param)
-{
-       struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
-       struct acpi_dma_spec *dma_spec = param;
-
-       if (chan->device->dev != dma_spec->dev ||
-           chan->chan_id != dma_spec->chan_id)
-               return false;
-
-       dwc->request_line = dma_spec->slave_id;
-       dwc->src_master = dwc_get_sms(NULL);
-       dwc->dst_master = dwc_get_dms(NULL);
-
-       return true;
-}
-
-static void dw_dma_acpi_controller_register(struct dw_dma *dw)
-{
-       struct device *dev = dw->dma.dev;
-       struct acpi_dma_filter_info *info;
-       int ret;
-
-       info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
-       if (!info)
-               return;
-
-       dma_cap_zero(info->dma_cap);
-       dma_cap_set(DMA_SLAVE, info->dma_cap);
-       info->filter_fn = dw_dma_acpi_filter;
-
-       ret = devm_acpi_dma_controller_register(dev, acpi_dma_simple_xlate,
-                                               info);
-       if (ret)
-               dev_err(dev, "could not register acpi_dma_controller\n");
-}
-#else /* !CONFIG_ACPI */
-static inline void dw_dma_acpi_controller_register(struct dw_dma *dw) {}
-#endif /* !CONFIG_ACPI */
-
-/* --------------------- Cyclic DMA API extensions -------------------- */
-
-/**
- * dw_dma_cyclic_start - start the cyclic DMA transfer
- * @chan: the DMA channel to start
- *
- * Must be called with soft interrupts disabled. Returns zero on success or
- * -errno on failure.
- */
-int dw_dma_cyclic_start(struct dma_chan *chan)
-{
-       struct dw_dma_chan      *dwc = to_dw_dma_chan(chan);
-       struct dw_dma           *dw = to_dw_dma(dwc->chan.device);
-       unsigned long           flags;
-
-       if (!test_bit(DW_DMA_IS_CYCLIC, &dwc->flags)) {
-               dev_err(chan2dev(&dwc->chan), "missing prep for cyclic DMA\n");
-               return -ENODEV;
-       }
-
-       spin_lock_irqsave(&dwc->lock, flags);
-
-       /* Assert channel is idle */
-       if (dma_readl(dw, CH_EN) & dwc->mask) {
-               dev_err(chan2dev(&dwc->chan),
-                       "BUG: Attempted to start non-idle channel\n");
-               dwc_dump_chan_regs(dwc);
-               spin_unlock_irqrestore(&dwc->lock, flags);
-               return -EBUSY;
-       }
-
-       dma_writel(dw, CLEAR.ERROR, dwc->mask);
-       dma_writel(dw, CLEAR.XFER, dwc->mask);
-
-       /* Setup DMAC channel registers */
-       channel_writel(dwc, LLP, dwc->cdesc->desc[0]->txd.phys);
-       channel_writel(dwc, CTL_LO, DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN);
-       channel_writel(dwc, CTL_HI, 0);
-
-       channel_set_bit(dw, CH_EN, dwc->mask);
-
-       spin_unlock_irqrestore(&dwc->lock, flags);
-
-       return 0;
-}
-EXPORT_SYMBOL(dw_dma_cyclic_start);
-
-/**
- * dw_dma_cyclic_stop - stop the cyclic DMA transfer
- * @chan: the DMA channel to stop
- *
- * Must be called with soft interrupts disabled.
- */
-void dw_dma_cyclic_stop(struct dma_chan *chan)
-{
-       struct dw_dma_chan      *dwc = to_dw_dma_chan(chan);
-       struct dw_dma           *dw = to_dw_dma(dwc->chan.device);
-       unsigned long           flags;
-
-       spin_lock_irqsave(&dwc->lock, flags);
-
-       dwc_chan_disable(dw, dwc);
-
-       spin_unlock_irqrestore(&dwc->lock, flags);
-}
-EXPORT_SYMBOL(dw_dma_cyclic_stop);
-
-/**
- * dw_dma_cyclic_prep - prepare the cyclic DMA transfer
- * @chan: the DMA channel to prepare
- * @buf_addr: physical DMA address where the buffer starts
- * @buf_len: total number of bytes for the entire buffer
- * @period_len: number of bytes for each period
- * @direction: transfer direction, to or from device
- *
- * Must be called before trying to start the transfer. Returns a valid struct
- * dw_cyclic_desc if successful or an ERR_PTR(-errno) if not successful.
- */
-struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
-               dma_addr_t buf_addr, size_t buf_len, size_t period_len,
-               enum dma_transfer_direction direction)
-{
-       struct dw_dma_chan              *dwc = to_dw_dma_chan(chan);
-       struct dma_slave_config         *sconfig = &dwc->dma_sconfig;
-       struct dw_cyclic_desc           *cdesc;
-       struct dw_cyclic_desc           *retval = NULL;
-       struct dw_desc                  *desc;
-       struct dw_desc                  *last = NULL;
-       unsigned long                   was_cyclic;
-       unsigned int                    reg_width;
-       unsigned int                    periods;
-       unsigned int                    i;
-       unsigned long                   flags;
-
-       spin_lock_irqsave(&dwc->lock, flags);
-       if (dwc->nollp) {
-               spin_unlock_irqrestore(&dwc->lock, flags);
-               dev_dbg(chan2dev(&dwc->chan),
-                               "channel doesn't support LLP transfers\n");
-               return ERR_PTR(-EINVAL);
-       }
-
-       if (!list_empty(&dwc->queue) || !list_empty(&dwc->active_list)) {
-               spin_unlock_irqrestore(&dwc->lock, flags);
-               dev_dbg(chan2dev(&dwc->chan),
-                               "queue and/or active list are not empty\n");
-               return ERR_PTR(-EBUSY);
-       }
-
-       was_cyclic = test_and_set_bit(DW_DMA_IS_CYCLIC, &dwc->flags);
-       spin_unlock_irqrestore(&dwc->lock, flags);
-       if (was_cyclic) {
-               dev_dbg(chan2dev(&dwc->chan),
-                               "channel already prepared for cyclic DMA\n");
-               return ERR_PTR(-EBUSY);
-       }
-
-       retval = ERR_PTR(-EINVAL);
-
-       if (unlikely(!is_slave_direction(direction)))
-               goto out_err;
-
-       dwc->direction = direction;
-
-       if (direction == DMA_MEM_TO_DEV)
-               reg_width = __ffs(sconfig->dst_addr_width);
-       else
-               reg_width = __ffs(sconfig->src_addr_width);
-
-       periods = buf_len / period_len;
-
-       /* Check for too big/unaligned periods and unaligned DMA buffer. */
-       if (period_len > (dwc->block_size << reg_width))
-               goto out_err;
-       if (unlikely(period_len & ((1 << reg_width) - 1)))
-               goto out_err;
-       if (unlikely(buf_addr & ((1 << reg_width) - 1)))
-               goto out_err;
-
-       retval = ERR_PTR(-ENOMEM);
-
-       if (periods > NR_DESCS_PER_CHANNEL)
-               goto out_err;
-
-       cdesc = kzalloc(sizeof(struct dw_cyclic_desc), GFP_KERNEL);
-       if (!cdesc)
-               goto out_err;
-
-       cdesc->desc = kzalloc(sizeof(struct dw_desc *) * periods, GFP_KERNEL);
-       if (!cdesc->desc)
-               goto out_err_alloc;
-
-       for (i = 0; i < periods; i++) {
-               desc = dwc_desc_get(dwc);
-               if (!desc)
-                       goto out_err_desc_get;
-
-               switch (direction) {
-               case DMA_MEM_TO_DEV:
-                       desc->lli.dar = sconfig->dst_addr;
-                       desc->lli.sar = buf_addr + (period_len * i);
-                       desc->lli.ctllo = (DWC_DEFAULT_CTLLO(chan)
-                                       | DWC_CTLL_DST_WIDTH(reg_width)
-                                       | DWC_CTLL_SRC_WIDTH(reg_width)
-                                       | DWC_CTLL_DST_FIX
-                                       | DWC_CTLL_SRC_INC
-                                       | DWC_CTLL_INT_EN);
-
-                       desc->lli.ctllo |= sconfig->device_fc ?
-                               DWC_CTLL_FC(DW_DMA_FC_P_M2P) :
-                               DWC_CTLL_FC(DW_DMA_FC_D_M2P);
-
-                       break;
-               case DMA_DEV_TO_MEM:
-                       desc->lli.dar = buf_addr + (period_len * i);
-                       desc->lli.sar = sconfig->src_addr;
-                       desc->lli.ctllo = (DWC_DEFAULT_CTLLO(chan)
-                                       | DWC_CTLL_SRC_WIDTH(reg_width)
-                                       | DWC_CTLL_DST_WIDTH(reg_width)
-                                       | DWC_CTLL_DST_INC
-                                       | DWC_CTLL_SRC_FIX
-                                       | DWC_CTLL_INT_EN);
-
-                       desc->lli.ctllo |= sconfig->device_fc ?
-                               DWC_CTLL_FC(DW_DMA_FC_P_P2M) :
-                               DWC_CTLL_FC(DW_DMA_FC_D_P2M);
-
-                       break;
-               default:
-                       break;
-               }
-
-               desc->lli.ctlhi = (period_len >> reg_width);
-               cdesc->desc[i] = desc;
-
-               if (last)
-                       last->lli.llp = desc->txd.phys;
-
-               last = desc;
-       }
-
-       /* Let's make a cyclic list */
-       last->lli.llp = cdesc->desc[0]->txd.phys;
-
-       dev_dbg(chan2dev(&dwc->chan), "cyclic prepared buf 0x%llx len %zu "
-                       "period %zu periods %d\n", (unsigned long long)buf_addr,
-                       buf_len, period_len, periods);
-
-       cdesc->periods = periods;
-       dwc->cdesc = cdesc;
-
-       return cdesc;
-
-out_err_desc_get:
-       while (i--)
-               dwc_desc_put(dwc, cdesc->desc[i]);
-out_err_alloc:
-       kfree(cdesc);
-out_err:
-       clear_bit(DW_DMA_IS_CYCLIC, &dwc->flags);
-       return (struct dw_cyclic_desc *)retval;
-}
-EXPORT_SYMBOL(dw_dma_cyclic_prep);
-
-/**
- * dw_dma_cyclic_free - free a prepared cyclic DMA transfer
- * @chan: the DMA channel to free
- */
-void dw_dma_cyclic_free(struct dma_chan *chan)
-{
-       struct dw_dma_chan      *dwc = to_dw_dma_chan(chan);
-       struct dw_dma           *dw = to_dw_dma(dwc->chan.device);
-       struct dw_cyclic_desc   *cdesc = dwc->cdesc;
-       int                     i;
-       unsigned long           flags;
-
-       dev_dbg(chan2dev(&dwc->chan), "%s\n", __func__);
-
-       if (!cdesc)
-               return;
-
-       spin_lock_irqsave(&dwc->lock, flags);
-
-       dwc_chan_disable(dw, dwc);
-
-       dma_writel(dw, CLEAR.ERROR, dwc->mask);
-       dma_writel(dw, CLEAR.XFER, dwc->mask);
-
-       spin_unlock_irqrestore(&dwc->lock, flags);
-
-       for (i = 0; i < cdesc->periods; i++)
-               dwc_desc_put(dwc, cdesc->desc[i]);
-
-       kfree(cdesc->desc);
-       kfree(cdesc);
-
-       clear_bit(DW_DMA_IS_CYCLIC, &dwc->flags);
-}
-EXPORT_SYMBOL(dw_dma_cyclic_free);
-
-/*----------------------------------------------------------------------*/
-
-static void dw_dma_off(struct dw_dma *dw)
-{
-       int i;
-
-       dma_writel(dw, CFG, 0);
-
-       channel_clear_bit(dw, MASK.XFER, dw->all_chan_mask);
-       channel_clear_bit(dw, MASK.SRC_TRAN, dw->all_chan_mask);
-       channel_clear_bit(dw, MASK.DST_TRAN, dw->all_chan_mask);
-       channel_clear_bit(dw, MASK.ERROR, dw->all_chan_mask);
-
-       while (dma_readl(dw, CFG) & DW_CFG_DMA_EN)
-               cpu_relax();
-
-       for (i = 0; i < dw->dma.chancnt; i++)
-               dw->chan[i].initialized = false;
-}
-
-#ifdef CONFIG_OF
-static struct dw_dma_platform_data *
-dw_dma_parse_dt(struct platform_device *pdev)
-{
-       struct device_node *np = pdev->dev.of_node;
-       struct dw_dma_platform_data *pdata;
-       u32 tmp, arr[4];
-
-       if (!np) {
-               dev_err(&pdev->dev, "Missing DT data\n");
-               return NULL;
-       }
-
-       pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
-       if (!pdata)
-               return NULL;
-
-       if (of_property_read_u32(np, "dma-channels", &pdata->nr_channels))
-               return NULL;
-
-       if (of_property_read_bool(np, "is_private"))
-               pdata->is_private = true;
-
-       if (!of_property_read_u32(np, "chan_allocation_order", &tmp))
-               pdata->chan_allocation_order = (unsigned char)tmp;
-
-       if (!of_property_read_u32(np, "chan_priority", &tmp))
-               pdata->chan_priority = tmp;
-
-       if (!of_property_read_u32(np, "block_size", &tmp))
-               pdata->block_size = tmp;
-
-       if (!of_property_read_u32(np, "dma-masters", &tmp)) {
-               if (tmp > 4)
-                       return NULL;
-
-               pdata->nr_masters = tmp;
-       }
-
-       if (!of_property_read_u32_array(np, "data_width", arr,
-                               pdata->nr_masters))
-               for (tmp = 0; tmp < pdata->nr_masters; tmp++)
-                       pdata->data_width[tmp] = arr[tmp];
-
-       return pdata;
-}
-#else
-static inline struct dw_dma_platform_data *
-dw_dma_parse_dt(struct platform_device *pdev)
-{
-       return NULL;
-}
-#endif
-
-static int dw_probe(struct platform_device *pdev)
-{
-       struct dw_dma_platform_data *pdata;
-       struct resource         *io;
-       struct dw_dma           *dw;
-       size_t                  size;
-       void __iomem            *regs;
-       bool                    autocfg;
-       unsigned int            dw_params;
-       unsigned int            nr_channels;
-       unsigned int            max_blk_size = 0;
-       int                     irq;
-       int                     err;
-       int                     i;
-
-       irq = platform_get_irq(pdev, 0);
-       if (irq < 0)
-               return irq;
-
-       io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-       regs = devm_ioremap_resource(&pdev->dev, io);
-       if (IS_ERR(regs))
-               return PTR_ERR(regs);
-
-       /* Apply default dma_mask if needed */
-       if (!pdev->dev.dma_mask) {
-               pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
-               pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
-       }
-
-       dw_params = dma_read_byaddr(regs, DW_PARAMS);
-       autocfg = dw_params >> DW_PARAMS_EN & 0x1;
-
-       dev_dbg(&pdev->dev, "DW_PARAMS: 0x%08x\n", dw_params);
-
-       pdata = dev_get_platdata(&pdev->dev);
-       if (!pdata)
-               pdata = dw_dma_parse_dt(pdev);
-
-       if (!pdata && autocfg) {
-               pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
-               if (!pdata)
-                       return -ENOMEM;
-
-               /* Fill platform data with the default values */
-               pdata->is_private = true;
-               pdata->chan_allocation_order = CHAN_ALLOCATION_ASCENDING;
-               pdata->chan_priority = CHAN_PRIORITY_ASCENDING;
-       } else if (!pdata || pdata->nr_channels > DW_DMA_MAX_NR_CHANNELS)
-               return -EINVAL;
-
-       if (autocfg)
-               nr_channels = (dw_params >> DW_PARAMS_NR_CHAN & 0x7) + 1;
-       else
-               nr_channels = pdata->nr_channels;
-
-       size = sizeof(struct dw_dma) + nr_channels * sizeof(struct dw_dma_chan);
-       dw = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
-       if (!dw)
-               return -ENOMEM;
-
-       dw->clk = devm_clk_get(&pdev->dev, "hclk");
-       if (IS_ERR(dw->clk))
-               return PTR_ERR(dw->clk);
-       clk_prepare_enable(dw->clk);
-
-       dw->regs = regs;
-
-       /* Get hardware configuration parameters */
-       if (autocfg) {
-               max_blk_size = dma_readl(dw, MAX_BLK_SIZE);
-
-               dw->nr_masters = (dw_params >> DW_PARAMS_NR_MASTER & 3) + 1;
-               for (i = 0; i < dw->nr_masters; i++) {
-                       dw->data_width[i] =
-                               (dw_params >> DW_PARAMS_DATA_WIDTH(i) & 3) + 2;
-               }
-       } else {
-               dw->nr_masters = pdata->nr_masters;
-               memcpy(dw->data_width, pdata->data_width, 4);
-       }
-
-       /* Calculate all channel mask before DMA setup */
-       dw->all_chan_mask = (1 << nr_channels) - 1;
-
-       /* Force dma off, just in case */
-       dw_dma_off(dw);
-
-       /* Disable BLOCK interrupts as well */
-       channel_clear_bit(dw, MASK.BLOCK, dw->all_chan_mask);
-
-       err = devm_request_irq(&pdev->dev, irq, dw_dma_interrupt, 0,
-                              "dw_dmac", dw);
-       if (err)
-               return err;
-
-       platform_set_drvdata(pdev, dw);
-
-       /* Create a pool of consistent memory blocks for hardware descriptors */
-       dw->desc_pool = dmam_pool_create("dw_dmac_desc_pool", &pdev->dev,
-                                        sizeof(struct dw_desc), 4, 0);
-       if (!dw->desc_pool) {
-               dev_err(&pdev->dev, "No memory for descriptors dma pool\n");
-               return -ENOMEM;
-       }
-
-       tasklet_init(&dw->tasklet, dw_dma_tasklet, (unsigned long)dw);
-
-       INIT_LIST_HEAD(&dw->dma.channels);
-       for (i = 0; i < nr_channels; i++) {
-               struct dw_dma_chan      *dwc = &dw->chan[i];
-               int                     r = nr_channels - i - 1;
-
-               dwc->chan.device = &dw->dma;
-               dma_cookie_init(&dwc->chan);
-               if (pdata->chan_allocation_order == CHAN_ALLOCATION_ASCENDING)
-                       list_add_tail(&dwc->chan.device_node,
-                                       &dw->dma.channels);
-               else
-                       list_add(&dwc->chan.device_node, &dw->dma.channels);
-
-               /* 7 is highest priority & 0 is lowest. */
-               if (pdata->chan_priority == CHAN_PRIORITY_ASCENDING)
-                       dwc->priority = r;
-               else
-                       dwc->priority = i;
-
-               dwc->ch_regs = &__dw_regs(dw)->CHAN[i];
-               spin_lock_init(&dwc->lock);
-               dwc->mask = 1 << i;
-
-               INIT_LIST_HEAD(&dwc->active_list);
-               INIT_LIST_HEAD(&dwc->queue);
-               INIT_LIST_HEAD(&dwc->free_list);
-
-               channel_clear_bit(dw, CH_EN, dwc->mask);
-
-               dwc->direction = DMA_TRANS_NONE;
-               dwc->request_line = ~0;
-
-               /* Hardware configuration */
-               if (autocfg) {
-                       unsigned int dwc_params;
-
-                       dwc_params = dma_read_byaddr(regs + r * sizeof(u32),
-                                                    DWC_PARAMS);
-
-                       dev_dbg(&pdev->dev, "DWC_PARAMS[%d]: 0x%08x\n", i,
-                                           dwc_params);
-
-                       /* Decode maximum block size for given channel. The
-                        * stored 4 bit value represents blocks from 0x00 for 3
-                        * up to 0x0a for 4095. */
-                       dwc->block_size =
-                               (4 << ((max_blk_size >> 4 * i) & 0xf)) - 1;
-                       dwc->nollp =
-                               (dwc_params >> DWC_PARAMS_MBLK_EN & 0x1) == 0;
-               } else {
-                       dwc->block_size = pdata->block_size;
-
-                       /* Check if channel supports multi block transfer */
-                       channel_writel(dwc, LLP, 0xfffffffc);
-                       dwc->nollp =
-                               (channel_readl(dwc, LLP) & 0xfffffffc) == 0;
-                       channel_writel(dwc, LLP, 0);
-               }
-       }
-
-       /* Clear all interrupts on all channels. */
-       dma_writel(dw, CLEAR.XFER, dw->all_chan_mask);
-       dma_writel(dw, CLEAR.BLOCK, dw->all_chan_mask);
-       dma_writel(dw, CLEAR.SRC_TRAN, dw->all_chan_mask);
-       dma_writel(dw, CLEAR.DST_TRAN, dw->all_chan_mask);
-       dma_writel(dw, CLEAR.ERROR, dw->all_chan_mask);
-
-       dma_cap_set(DMA_MEMCPY, dw->dma.cap_mask);
-       dma_cap_set(DMA_SLAVE, dw->dma.cap_mask);
-       if (pdata->is_private)
-               dma_cap_set(DMA_PRIVATE, dw->dma.cap_mask);
-       dw->dma.dev = &pdev->dev;
-       dw->dma.device_alloc_chan_resources = dwc_alloc_chan_resources;
-       dw->dma.device_free_chan_resources = dwc_free_chan_resources;
-
-       dw->dma.device_prep_dma_memcpy = dwc_prep_dma_memcpy;
-
-       dw->dma.device_prep_slave_sg = dwc_prep_slave_sg;
-       dw->dma.device_control = dwc_control;
-
-       dw->dma.device_tx_status = dwc_tx_status;
-       dw->dma.device_issue_pending = dwc_issue_pending;
-
-       dma_writel(dw, CFG, DW_CFG_DMA_EN);
-
-       dev_info(&pdev->dev, "DesignWare DMA Controller, %d channels\n",
-                nr_channels);
-
-       dma_async_device_register(&dw->dma);
-
-       if (pdev->dev.of_node) {
-               err = of_dma_controller_register(pdev->dev.of_node,
-                                                dw_dma_of_xlate, dw);
-               if (err)
-                       dev_err(&pdev->dev,
-                               "could not register of_dma_controller\n");
-       }
-
-       if (ACPI_HANDLE(&pdev->dev))
-               dw_dma_acpi_controller_register(dw);
-
-       return 0;
-}
-
-static int dw_remove(struct platform_device *pdev)
-{
-       struct dw_dma           *dw = platform_get_drvdata(pdev);
-       struct dw_dma_chan      *dwc, *_dwc;
-
-       if (pdev->dev.of_node)
-               of_dma_controller_free(pdev->dev.of_node);
-       dw_dma_off(dw);
-       dma_async_device_unregister(&dw->dma);
-
-       tasklet_kill(&dw->tasklet);
-
-       list_for_each_entry_safe(dwc, _dwc, &dw->dma.channels,
-                       chan.device_node) {
-               list_del(&dwc->chan.device_node);
-               channel_clear_bit(dw, CH_EN, dwc->mask);
-       }
-
-       return 0;
-}
-
-static void dw_shutdown(struct platform_device *pdev)
-{
-       struct dw_dma   *dw = platform_get_drvdata(pdev);
-
-       dw_dma_off(dw);
-       clk_disable_unprepare(dw->clk);
-}
-
-static int dw_suspend_noirq(struct device *dev)
-{
-       struct platform_device *pdev = to_platform_device(dev);
-       struct dw_dma   *dw = platform_get_drvdata(pdev);
-
-       dw_dma_off(dw);
-       clk_disable_unprepare(dw->clk);
-
-       return 0;
-}
-
-static int dw_resume_noirq(struct device *dev)
-{
-       struct platform_device *pdev = to_platform_device(dev);
-       struct dw_dma   *dw = platform_get_drvdata(pdev);
-
-       clk_prepare_enable(dw->clk);
-       dma_writel(dw, CFG, DW_CFG_DMA_EN);
-
-       return 0;
-}
-
-static const struct dev_pm_ops dw_dev_pm_ops = {
-       .suspend_noirq = dw_suspend_noirq,
-       .resume_noirq = dw_resume_noirq,
-       .freeze_noirq = dw_suspend_noirq,
-       .thaw_noirq = dw_resume_noirq,
-       .restore_noirq = dw_resume_noirq,
-       .poweroff_noirq = dw_suspend_noirq,
-};
-
-#ifdef CONFIG_OF
-static const struct of_device_id dw_dma_of_id_table[] = {
-       { .compatible = "snps,dma-spear1340" },
-       {}
-};
-MODULE_DEVICE_TABLE(of, dw_dma_of_id_table);
-#endif
-
-#ifdef CONFIG_ACPI
-static const struct acpi_device_id dw_dma_acpi_id_table[] = {
-       { "INTL9C60", 0 },
-       { }
-};
-#endif
-
-static struct platform_driver dw_driver = {
-       .probe          = dw_probe,
-       .remove         = dw_remove,
-       .shutdown       = dw_shutdown,
-       .driver = {
-               .name   = "dw_dmac",
-               .pm     = &dw_dev_pm_ops,
-               .of_match_table = of_match_ptr(dw_dma_of_id_table),
-               .acpi_match_table = ACPI_PTR(dw_dma_acpi_id_table),
-       },
-};
-
-static int __init dw_init(void)
-{
-       return platform_driver_register(&dw_driver);
-}
-subsys_initcall(dw_init);
-
-static void __exit dw_exit(void)
-{
-       platform_driver_unregister(&dw_driver);
-}
-module_exit(dw_exit);
-
-MODULE_LICENSE("GPL v2");
-MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller driver");
-MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
-MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>");
diff --git a/drivers/dma/dw/dw_dmac_regs.h b/drivers/dma/dw/dw_dmac_regs.h
deleted file mode 100644 (file)
index 9d41720..0000000
+++ /dev/null
@@ -1,311 +0,0 @@
-/*
- * Driver for the Synopsys DesignWare AHB DMA Controller
- *
- * Copyright (C) 2005-2007 Atmel Corporation
- * Copyright (C) 2010-2011 ST Microelectronics
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/dmaengine.h>
-#include <linux/dw_dmac.h>
-
-#define DW_DMA_MAX_NR_CHANNELS 8
-#define DW_DMA_MAX_NR_REQUESTS 16
-
-/* flow controller */
-enum dw_dma_fc {
-       DW_DMA_FC_D_M2M,
-       DW_DMA_FC_D_M2P,
-       DW_DMA_FC_D_P2M,
-       DW_DMA_FC_D_P2P,
-       DW_DMA_FC_P_P2M,
-       DW_DMA_FC_SP_P2P,
-       DW_DMA_FC_P_M2P,
-       DW_DMA_FC_DP_P2P,
-};
-
-/*
- * Redefine this macro to handle differences between 32- and 64-bit
- * addressing, big vs. little endian, etc.
- */
-#define DW_REG(name)           u32 name; u32 __pad_##name
-
-/* Hardware register definitions. */
-struct dw_dma_chan_regs {
-       DW_REG(SAR);            /* Source Address Register */
-       DW_REG(DAR);            /* Destination Address Register */
-       DW_REG(LLP);            /* Linked List Pointer */
-       u32     CTL_LO;         /* Control Register Low */
-       u32     CTL_HI;         /* Control Register High */
-       DW_REG(SSTAT);
-       DW_REG(DSTAT);
-       DW_REG(SSTATAR);
-       DW_REG(DSTATAR);
-       u32     CFG_LO;         /* Configuration Register Low */
-       u32     CFG_HI;         /* Configuration Register High */
-       DW_REG(SGR);
-       DW_REG(DSR);
-};
-
-struct dw_dma_irq_regs {
-       DW_REG(XFER);
-       DW_REG(BLOCK);
-       DW_REG(SRC_TRAN);
-       DW_REG(DST_TRAN);
-       DW_REG(ERROR);
-};
-
-struct dw_dma_regs {
-       /* per-channel registers */
-       struct dw_dma_chan_regs CHAN[DW_DMA_MAX_NR_CHANNELS];
-
-       /* irq handling */
-       struct dw_dma_irq_regs  RAW;            /* r */
-       struct dw_dma_irq_regs  STATUS;         /* r (raw & mask) */
-       struct dw_dma_irq_regs  MASK;           /* rw (set = irq enabled) */
-       struct dw_dma_irq_regs  CLEAR;          /* w (ack, affects "raw") */
-
-       DW_REG(STATUS_INT);                     /* r */
-
-       /* software handshaking */
-       DW_REG(REQ_SRC);
-       DW_REG(REQ_DST);
-       DW_REG(SGL_REQ_SRC);
-       DW_REG(SGL_REQ_DST);
-       DW_REG(LAST_SRC);
-       DW_REG(LAST_DST);
-
-       /* miscellaneous */
-       DW_REG(CFG);
-       DW_REG(CH_EN);
-       DW_REG(ID);
-       DW_REG(TEST);
-
-       /* reserved */
-       DW_REG(__reserved0);
-       DW_REG(__reserved1);
-
-       /* optional encoded params, 0x3c8..0x3f7 */
-       u32     __reserved;
-
-       /* per-channel configuration registers */
-       u32     DWC_PARAMS[DW_DMA_MAX_NR_CHANNELS];
-       u32     MULTI_BLK_TYPE;
-       u32     MAX_BLK_SIZE;
-
-       /* top-level parameters */
-       u32     DW_PARAMS;
-};
-
-#ifdef CONFIG_DW_DMAC_BIG_ENDIAN_IO
-#define dma_readl_native ioread32be
-#define dma_writel_native iowrite32be
-#else
-#define dma_readl_native readl
-#define dma_writel_native writel
-#endif
-
-/* To access the registers in early stage of probe */
-#define dma_read_byaddr(addr, name) \
-       dma_readl_native((addr) + offsetof(struct dw_dma_regs, name))
-
-/* Bitfields in DW_PARAMS */
-#define DW_PARAMS_NR_CHAN      8               /* number of channels */
-#define DW_PARAMS_NR_MASTER    11              /* number of AHB masters */
-#define DW_PARAMS_DATA_WIDTH(n)        (15 + 2 * (n))
-#define DW_PARAMS_DATA_WIDTH1  15              /* master 1 data width */
-#define DW_PARAMS_DATA_WIDTH2  17              /* master 2 data width */
-#define DW_PARAMS_DATA_WIDTH3  19              /* master 3 data width */
-#define DW_PARAMS_DATA_WIDTH4  21              /* master 4 data width */
-#define DW_PARAMS_EN           28              /* encoded parameters */
-
-/* Bitfields in DWC_PARAMS */
-#define DWC_PARAMS_MBLK_EN     11              /* multi block transfer */
-
-/* Bitfields in CTL_LO */
-#define DWC_CTLL_INT_EN                (1 << 0)        /* irqs enabled? */
-#define DWC_CTLL_DST_WIDTH(n)  ((n)<<1)        /* bytes per element */
-#define DWC_CTLL_SRC_WIDTH(n)  ((n)<<4)
-#define DWC_CTLL_DST_INC       (0<<7)          /* DAR update/not */
-#define DWC_CTLL_DST_DEC       (1<<7)
-#define DWC_CTLL_DST_FIX       (2<<7)
-#define DWC_CTLL_SRC_INC       (0<<7)          /* SAR update/not */
-#define DWC_CTLL_SRC_DEC       (1<<9)
-#define DWC_CTLL_SRC_FIX       (2<<9)
-#define DWC_CTLL_DST_MSIZE(n)  ((n)<<11)       /* burst, #elements */
-#define DWC_CTLL_SRC_MSIZE(n)  ((n)<<14)
-#define DWC_CTLL_S_GATH_EN     (1 << 17)       /* src gather, !FIX */
-#define DWC_CTLL_D_SCAT_EN     (1 << 18)       /* dst scatter, !FIX */
-#define DWC_CTLL_FC(n)         ((n) << 20)
-#define DWC_CTLL_FC_M2M                (0 << 20)       /* mem-to-mem */
-#define DWC_CTLL_FC_M2P                (1 << 20)       /* mem-to-periph */
-#define DWC_CTLL_FC_P2M                (2 << 20)       /* periph-to-mem */
-#define DWC_CTLL_FC_P2P                (3 << 20)       /* periph-to-periph */
-/* plus 4 transfer types for peripheral-as-flow-controller */
-#define DWC_CTLL_DMS(n)                ((n)<<23)       /* dst master select */
-#define DWC_CTLL_SMS(n)                ((n)<<25)       /* src master select */
-#define DWC_CTLL_LLP_D_EN      (1 << 27)       /* dest block chain */
-#define DWC_CTLL_LLP_S_EN      (1 << 28)       /* src block chain */
-
-/* Bitfields in CTL_HI */
-#define DWC_CTLH_DONE          0x00001000
-#define DWC_CTLH_BLOCK_TS_MASK 0x00000fff
-
-/* Bitfields in CFG_LO. Platform-configurable bits are in <linux/dw_dmac.h> */
-#define DWC_CFGL_CH_PRIOR_MASK (0x7 << 5)      /* priority mask */
-#define DWC_CFGL_CH_PRIOR(x)   ((x) << 5)      /* priority */
-#define DWC_CFGL_CH_SUSP       (1 << 8)        /* pause xfer */
-#define DWC_CFGL_FIFO_EMPTY    (1 << 9)        /* pause xfer */
-#define DWC_CFGL_HS_DST                (1 << 10)       /* handshake w/dst */
-#define DWC_CFGL_HS_SRC                (1 << 11)       /* handshake w/src */
-#define DWC_CFGL_MAX_BURST(x)  ((x) << 20)
-#define DWC_CFGL_RELOAD_SAR    (1 << 30)
-#define DWC_CFGL_RELOAD_DAR    (1 << 31)
-
-/* Bitfields in CFG_HI. Platform-configurable bits are in <linux/dw_dmac.h> */
-#define DWC_CFGH_DS_UPD_EN     (1 << 5)
-#define DWC_CFGH_SS_UPD_EN     (1 << 6)
-
-/* Bitfields in SGR */
-#define DWC_SGR_SGI(x)         ((x) << 0)
-#define DWC_SGR_SGC(x)         ((x) << 20)
-
-/* Bitfields in DSR */
-#define DWC_DSR_DSI(x)         ((x) << 0)
-#define DWC_DSR_DSC(x)         ((x) << 20)
-
-/* Bitfields in CFG */
-#define DW_CFG_DMA_EN          (1 << 0)
-
-enum dw_dmac_flags {
-       DW_DMA_IS_CYCLIC = 0,
-       DW_DMA_IS_SOFT_LLP = 1,
-};
-
-struct dw_dma_chan {
-       struct dma_chan                 chan;
-       void __iomem                    *ch_regs;
-       u8                              mask;
-       u8                              priority;
-       enum dma_transfer_direction     direction;
-       bool                            paused;
-       bool                            initialized;
-
-       /* software emulation of the LLP transfers */
-       struct list_head        *tx_node_active;
-
-       spinlock_t              lock;
-
-       /* these other elements are all protected by lock */
-       unsigned long           flags;
-       struct list_head        active_list;
-       struct list_head        queue;
-       struct list_head        free_list;
-       u32                     residue;
-       struct dw_cyclic_desc   *cdesc;
-
-       unsigned int            descs_allocated;
-
-       /* hardware configuration */
-       unsigned int            block_size;
-       bool                    nollp;
-
-       /* custom slave configuration */
-       unsigned int            request_line;
-       unsigned char           src_master;
-       unsigned char           dst_master;
-
-       /* configuration passed via DMA_SLAVE_CONFIG */
-       struct dma_slave_config dma_sconfig;
-};
-
-static inline struct dw_dma_chan_regs __iomem *
-__dwc_regs(struct dw_dma_chan *dwc)
-{
-       return dwc->ch_regs;
-}
-
-#define channel_readl(dwc, name) \
-       dma_readl_native(&(__dwc_regs(dwc)->name))
-#define channel_writel(dwc, name, val) \
-       dma_writel_native((val), &(__dwc_regs(dwc)->name))
-
-static inline struct dw_dma_chan *to_dw_dma_chan(struct dma_chan *chan)
-{
-       return container_of(chan, struct dw_dma_chan, chan);
-}
-
-struct dw_dma {
-       struct dma_device       dma;
-       void __iomem            *regs;
-       struct dma_pool         *desc_pool;
-       struct tasklet_struct   tasklet;
-       struct clk              *clk;
-
-       u8                      all_chan_mask;
-
-       /* hardware configuration */
-       unsigned char           nr_masters;
-       unsigned char           data_width[4];
-
-       struct dw_dma_chan      chan[0];
-};
-
-static inline struct dw_dma_regs __iomem *__dw_regs(struct dw_dma *dw)
-{
-       return dw->regs;
-}
-
-#define dma_readl(dw, name) \
-       dma_readl_native(&(__dw_regs(dw)->name))
-#define dma_writel(dw, name, val) \
-       dma_writel_native((val), &(__dw_regs(dw)->name))
-
-#define channel_set_bit(dw, reg, mask) \
-       dma_writel(dw, reg, ((mask) << 8) | (mask))
-#define channel_clear_bit(dw, reg, mask) \
-       dma_writel(dw, reg, ((mask) << 8) | 0)
-
-static inline struct dw_dma *to_dw_dma(struct dma_device *ddev)
-{
-       return container_of(ddev, struct dw_dma, dma);
-}
-
-/* LLI == Linked List Item; a.k.a. DMA block descriptor */
-struct dw_lli {
-       /* values that are not changed by hardware */
-       u32             sar;
-       u32             dar;
-       u32             llp;            /* chain to next lli */
-       u32             ctllo;
-       /* values that may get written back: */
-       u32             ctlhi;
-       /* sstat and dstat can snapshot peripheral register state.
-        * silicon config may discard either or both...
-        */
-       u32             sstat;
-       u32             dstat;
-};
-
-struct dw_desc {
-       /* FIRST values the hardware uses */
-       struct dw_lli                   lli;
-
-       /* THEN values for driver housekeeping */
-       struct list_head                desc_node;
-       struct list_head                tx_list;
-       struct dma_async_tx_descriptor  txd;
-       size_t                          len;
-       size_t                          total_len;
-};
-
-#define to_dw_desc(h)  list_entry(h, struct dw_desc, desc_node)
-
-static inline struct dw_desc *
-txd_to_dw_desc(struct dma_async_tx_descriptor *txd)
-{
-       return container_of(txd, struct dw_desc, txd);
-}
diff --git a/drivers/dma/dw/internal.h b/drivers/dma/dw/internal.h
new file mode 100644 (file)
index 0000000..32667f9
--- /dev/null
@@ -0,0 +1,70 @@
+/*
+ * Driver for the Synopsys DesignWare DMA Controller
+ *
+ * Copyright (C) 2013 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _DW_DMAC_INTERNAL_H
+#define _DW_DMAC_INTERNAL_H
+
+#include <linux/device.h>
+#include <linux/dw_dmac.h>
+
+#include "regs.h"
+
+/**
+ * struct dw_dma_chip - representation of DesignWare DMA controller hardware
+ * @dev:               struct device of the DMA controller
+ * @irq:               irq line
+ * @regs:              memory mapped I/O space
+ * @dw:                        struct dw_dma that is filed by dw_dma_probe()
+ */
+struct dw_dma_chip {
+       struct device   *dev;
+       int             irq;
+       void __iomem    *regs;
+       struct dw_dma   *dw;
+};
+
+/* Export to the platform drivers */
+int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata);
+int dw_dma_remove(struct dw_dma_chip *chip);
+
+void dw_dma_shutdown(struct dw_dma_chip *chip);
+
+#ifdef CONFIG_PM_SLEEP
+
+int dw_dma_suspend(struct dw_dma_chip *chip);
+int dw_dma_resume(struct dw_dma_chip *chip);
+
+#endif /* CONFIG_PM_SLEEP */
+
+/**
+ * dwc_get_dms - get destination master
+ * @slave:     pointer to the custom slave configuration
+ *
+ * Returns destination master in the custom slave configuration if defined, or
+ * default value otherwise.
+ */
+static inline unsigned int dwc_get_dms(struct dw_dma_slave *slave)
+{
+       return slave ? slave->dst_master : 0;
+}
+
+/**
+ * dwc_get_sms - get source master
+ * @slave:     pointer to the custom slave configuration
+ *
+ * Returns source master in the custom slave configuration if defined, or
+ * default value otherwise.
+ */
+static inline unsigned int dwc_get_sms(struct dw_dma_slave *slave)
+{
+       return slave ? slave->src_master : 1;
+}
+
+#endif /* _DW_DMAC_INTERNAL_H */
diff --git a/drivers/dma/dw/platform.c b/drivers/dma/dw/platform.c
new file mode 100644 (file)
index 0000000..6c9449c
--- /dev/null
@@ -0,0 +1,317 @@
+/*
+ * Platform driver for the Synopsys DesignWare DMA Controller
+ *
+ * Copyright (C) 2007-2008 Atmel Corporation
+ * Copyright (C) 2010-2011 ST Microelectronics
+ * Copyright (C) 2013 Intel Corporation
+ *
+ * Some parts of this driver are derived from the original dw_dmac.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/of.h>
+#include <linux/of_dma.h>
+#include <linux/acpi.h>
+#include <linux/acpi_dma.h>
+
+#include "internal.h"
+
+struct dw_dma_of_filter_args {
+       struct dw_dma *dw;
+       unsigned int req;
+       unsigned int src;
+       unsigned int dst;
+};
+
+static bool dw_dma_of_filter(struct dma_chan *chan, void *param)
+{
+       struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
+       struct dw_dma_of_filter_args *fargs = param;
+
+       /* Ensure the device matches our channel */
+       if (chan->device != &fargs->dw->dma)
+               return false;
+
+       dwc->request_line = fargs->req;
+       dwc->src_master = fargs->src;
+       dwc->dst_master = fargs->dst;
+
+       return true;
+}
+
+static struct dma_chan *dw_dma_of_xlate(struct of_phandle_args *dma_spec,
+                                       struct of_dma *ofdma)
+{
+       struct dw_dma *dw = ofdma->of_dma_data;
+       struct dw_dma_of_filter_args fargs = {
+               .dw = dw,
+       };
+       dma_cap_mask_t cap;
+
+       if (dma_spec->args_count != 3)
+               return NULL;
+
+       fargs.req = dma_spec->args[0];
+       fargs.src = dma_spec->args[1];
+       fargs.dst = dma_spec->args[2];
+
+       if (WARN_ON(fargs.req >= DW_DMA_MAX_NR_REQUESTS ||
+                   fargs.src >= dw->nr_masters ||
+                   fargs.dst >= dw->nr_masters))
+               return NULL;
+
+       dma_cap_zero(cap);
+       dma_cap_set(DMA_SLAVE, cap);
+
+       /* TODO: there should be a simpler way to do this */
+       return dma_request_channel(cap, dw_dma_of_filter, &fargs);
+}
+
+#ifdef CONFIG_ACPI
+static bool dw_dma_acpi_filter(struct dma_chan *chan, void *param)
+{
+       struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
+       struct acpi_dma_spec *dma_spec = param;
+
+       if (chan->device->dev != dma_spec->dev ||
+           chan->chan_id != dma_spec->chan_id)
+               return false;
+
+       dwc->request_line = dma_spec->slave_id;
+       dwc->src_master = dwc_get_sms(NULL);
+       dwc->dst_master = dwc_get_dms(NULL);
+
+       return true;
+}
+
+static void dw_dma_acpi_controller_register(struct dw_dma *dw)
+{
+       struct device *dev = dw->dma.dev;
+       struct acpi_dma_filter_info *info;
+       int ret;
+
+       info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
+       if (!info)
+               return;
+
+       dma_cap_zero(info->dma_cap);
+       dma_cap_set(DMA_SLAVE, info->dma_cap);
+       info->filter_fn = dw_dma_acpi_filter;
+
+       ret = devm_acpi_dma_controller_register(dev, acpi_dma_simple_xlate,
+                                               info);
+       if (ret)
+               dev_err(dev, "could not register acpi_dma_controller\n");
+}
+#else /* !CONFIG_ACPI */
+static inline void dw_dma_acpi_controller_register(struct dw_dma *dw) {}
+#endif /* !CONFIG_ACPI */
+
+#ifdef CONFIG_OF
+static struct dw_dma_platform_data *
+dw_dma_parse_dt(struct platform_device *pdev)
+{
+       struct device_node *np = pdev->dev.of_node;
+       struct dw_dma_platform_data *pdata;
+       u32 tmp, arr[4];
+
+       if (!np) {
+               dev_err(&pdev->dev, "Missing DT data\n");
+               return NULL;
+       }
+
+       pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+       if (!pdata)
+               return NULL;
+
+       if (of_property_read_u32(np, "dma-channels", &pdata->nr_channels))
+               return NULL;
+
+       if (of_property_read_bool(np, "is_private"))
+               pdata->is_private = true;
+
+       if (!of_property_read_u32(np, "chan_allocation_order", &tmp))
+               pdata->chan_allocation_order = (unsigned char)tmp;
+
+       if (!of_property_read_u32(np, "chan_priority", &tmp))
+               pdata->chan_priority = tmp;
+
+       if (!of_property_read_u32(np, "block_size", &tmp))
+               pdata->block_size = tmp;
+
+       if (!of_property_read_u32(np, "dma-masters", &tmp)) {
+               if (tmp > 4)
+                       return NULL;
+
+               pdata->nr_masters = tmp;
+       }
+
+       if (!of_property_read_u32_array(np, "data_width", arr,
+                               pdata->nr_masters))
+               for (tmp = 0; tmp < pdata->nr_masters; tmp++)
+                       pdata->data_width[tmp] = arr[tmp];
+
+       return pdata;
+}
+#else
+static inline struct dw_dma_platform_data *
+dw_dma_parse_dt(struct platform_device *pdev)
+{
+       return NULL;
+}
+#endif
+
+static int dw_probe(struct platform_device *pdev)
+{
+       struct dw_dma_chip *chip;
+       struct device *dev = &pdev->dev;
+       struct resource *mem;
+       struct dw_dma_platform_data *pdata;
+       int err;
+
+       chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+       if (!chip)
+               return -ENOMEM;
+
+       chip->irq = platform_get_irq(pdev, 0);
+       if (chip->irq < 0)
+               return chip->irq;
+
+       mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       chip->regs = devm_ioremap_resource(dev, mem);
+       if (IS_ERR(chip->regs))
+               return PTR_ERR(chip->regs);
+
+       /* Apply default dma_mask if needed */
+       if (!dev->dma_mask) {
+               dev->dma_mask = &dev->coherent_dma_mask;
+               dev->coherent_dma_mask = DMA_BIT_MASK(32);
+       }
+
+       pdata = dev_get_platdata(dev);
+       if (!pdata)
+               pdata = dw_dma_parse_dt(pdev);
+
+       chip->dev = dev;
+
+       err = dw_dma_probe(chip, pdata);
+       if (err)
+               return err;
+
+       platform_set_drvdata(pdev, chip);
+
+       if (pdev->dev.of_node) {
+               err = of_dma_controller_register(pdev->dev.of_node,
+                                                dw_dma_of_xlate, chip->dw);
+               if (err)
+                       dev_err(&pdev->dev,
+                               "could not register of_dma_controller\n");
+       }
+
+       if (ACPI_HANDLE(&pdev->dev))
+               dw_dma_acpi_controller_register(chip->dw);
+
+       return 0;
+}
+
+static int dw_remove(struct platform_device *pdev)
+{
+       struct dw_dma_chip *chip = platform_get_drvdata(pdev);
+
+       if (pdev->dev.of_node)
+               of_dma_controller_free(pdev->dev.of_node);
+
+       return dw_dma_remove(chip);
+}
+
+static void dw_shutdown(struct platform_device *pdev)
+{
+       struct dw_dma_chip *chip = platform_get_drvdata(pdev);
+
+       dw_dma_shutdown(chip);
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id dw_dma_of_id_table[] = {
+       { .compatible = "snps,dma-spear1340" },
+       {}
+};
+MODULE_DEVICE_TABLE(of, dw_dma_of_id_table);
+#endif
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id dw_dma_acpi_id_table[] = {
+       { "INTL9C60", 0 },
+       { }
+};
+#endif
+
+#ifdef CONFIG_PM_SLEEP
+
+static int dw_suspend_noirq(struct device *dev)
+{
+       struct platform_device *pdev = to_platform_device(dev);
+       struct dw_dma_chip *chip = platform_get_drvdata(pdev);
+
+       return dw_dma_suspend(chip);
+}
+
+static int dw_resume_noirq(struct device *dev)
+{
+       struct platform_device *pdev = to_platform_device(dev);
+       struct dw_dma_chip *chip = platform_get_drvdata(pdev);
+
+       return dw_dma_resume(chip);
+}
+
+#else /* !CONFIG_PM_SLEEP */
+
+#define dw_suspend_noirq       NULL
+#define dw_resume_noirq                NULL
+
+#endif /* !CONFIG_PM_SLEEP */
+
+static const struct dev_pm_ops dw_dev_pm_ops = {
+       .suspend_noirq = dw_suspend_noirq,
+       .resume_noirq = dw_resume_noirq,
+       .freeze_noirq = dw_suspend_noirq,
+       .thaw_noirq = dw_resume_noirq,
+       .restore_noirq = dw_resume_noirq,
+       .poweroff_noirq = dw_suspend_noirq,
+};
+
+static struct platform_driver dw_driver = {
+       .probe          = dw_probe,
+       .remove         = dw_remove,
+       .shutdown       = dw_shutdown,
+       .driver = {
+               .name   = "dw_dmac",
+               .pm     = &dw_dev_pm_ops,
+               .of_match_table = of_match_ptr(dw_dma_of_id_table),
+               .acpi_match_table = ACPI_PTR(dw_dma_acpi_id_table),
+       },
+};
+
+static int __init dw_init(void)
+{
+       return platform_driver_register(&dw_driver);
+}
+subsys_initcall(dw_init);
+
+static void __exit dw_exit(void)
+{
+       platform_driver_unregister(&dw_driver);
+}
+module_exit(dw_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller platform driver");
diff --git a/drivers/dma/dw/regs.h b/drivers/dma/dw/regs.h
new file mode 100644 (file)
index 0000000..07c5a6e
--- /dev/null
@@ -0,0 +1,312 @@
+/*
+ * Driver for the Synopsys DesignWare AHB DMA Controller
+ *
+ * Copyright (C) 2005-2007 Atmel Corporation
+ * Copyright (C) 2010-2011 ST Microelectronics
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/dmaengine.h>
+#include <linux/dw_dmac.h>
+
+#define DW_DMA_MAX_NR_CHANNELS 8
+#define DW_DMA_MAX_NR_REQUESTS 16
+
+/* flow controller */
+enum dw_dma_fc {
+       DW_DMA_FC_D_M2M,
+       DW_DMA_FC_D_M2P,
+       DW_DMA_FC_D_P2M,
+       DW_DMA_FC_D_P2P,
+       DW_DMA_FC_P_P2M,
+       DW_DMA_FC_SP_P2P,
+       DW_DMA_FC_P_M2P,
+       DW_DMA_FC_DP_P2P,
+};
+
+/*
+ * Redefine this macro to handle differences between 32- and 64-bit
+ * addressing, big vs. little endian, etc.
+ */
+#define DW_REG(name)           u32 name; u32 __pad_##name
+
+/* Hardware register definitions. */
+struct dw_dma_chan_regs {
+       DW_REG(SAR);            /* Source Address Register */
+       DW_REG(DAR);            /* Destination Address Register */
+       DW_REG(LLP);            /* Linked List Pointer */
+       u32     CTL_LO;         /* Control Register Low */
+       u32     CTL_HI;         /* Control Register High */
+       DW_REG(SSTAT);
+       DW_REG(DSTAT);
+       DW_REG(SSTATAR);
+       DW_REG(DSTATAR);
+       u32     CFG_LO;         /* Configuration Register Low */
+       u32     CFG_HI;         /* Configuration Register High */
+       DW_REG(SGR);
+       DW_REG(DSR);
+};
+
+struct dw_dma_irq_regs {
+       DW_REG(XFER);
+       DW_REG(BLOCK);
+       DW_REG(SRC_TRAN);
+       DW_REG(DST_TRAN);
+       DW_REG(ERROR);
+};
+
+struct dw_dma_regs {
+       /* per-channel registers */
+       struct dw_dma_chan_regs CHAN[DW_DMA_MAX_NR_CHANNELS];
+
+       /* irq handling */
+       struct dw_dma_irq_regs  RAW;            /* r */
+       struct dw_dma_irq_regs  STATUS;         /* r (raw & mask) */
+       struct dw_dma_irq_regs  MASK;           /* rw (set = irq enabled) */
+       struct dw_dma_irq_regs  CLEAR;          /* w (ack, affects "raw") */
+
+       DW_REG(STATUS_INT);                     /* r */
+
+       /* software handshaking */
+       DW_REG(REQ_SRC);
+       DW_REG(REQ_DST);
+       DW_REG(SGL_REQ_SRC);
+       DW_REG(SGL_REQ_DST);
+       DW_REG(LAST_SRC);
+       DW_REG(LAST_DST);
+
+       /* miscellaneous */
+       DW_REG(CFG);
+       DW_REG(CH_EN);
+       DW_REG(ID);
+       DW_REG(TEST);
+
+       /* reserved */
+       DW_REG(__reserved0);
+       DW_REG(__reserved1);
+
+       /* optional encoded params, 0x3c8..0x3f7 */
+       u32     __reserved;
+
+       /* per-channel configuration registers */
+       u32     DWC_PARAMS[DW_DMA_MAX_NR_CHANNELS];
+       u32     MULTI_BLK_TYPE;
+       u32     MAX_BLK_SIZE;
+
+       /* top-level parameters */
+       u32     DW_PARAMS;
+};
+
+#ifdef CONFIG_DW_DMAC_BIG_ENDIAN_IO
+#define dma_readl_native ioread32be
+#define dma_writel_native iowrite32be
+#else
+#define dma_readl_native readl
+#define dma_writel_native writel
+#endif
+
+/* To access the registers in early stage of probe */
+#define dma_read_byaddr(addr, name) \
+       dma_readl_native((addr) + offsetof(struct dw_dma_regs, name))
+
+/* Bitfields in DW_PARAMS */
+#define DW_PARAMS_NR_CHAN      8               /* number of channels */
+#define DW_PARAMS_NR_MASTER    11              /* number of AHB masters */
+#define DW_PARAMS_DATA_WIDTH(n)        (15 + 2 * (n))
+#define DW_PARAMS_DATA_WIDTH1  15              /* master 1 data width */
+#define DW_PARAMS_DATA_WIDTH2  17              /* master 2 data width */
+#define DW_PARAMS_DATA_WIDTH3  19              /* master 3 data width */
+#define DW_PARAMS_DATA_WIDTH4  21              /* master 4 data width */
+#define DW_PARAMS_EN           28              /* encoded parameters */
+
+/* Bitfields in DWC_PARAMS */
+#define DWC_PARAMS_MBLK_EN     11              /* multi block transfer */
+
+/* Bitfields in CTL_LO */
+#define DWC_CTLL_INT_EN                (1 << 0)        /* irqs enabled? */
+#define DWC_CTLL_DST_WIDTH(n)  ((n)<<1)        /* bytes per element */
+#define DWC_CTLL_SRC_WIDTH(n)  ((n)<<4)
+#define DWC_CTLL_DST_INC       (0<<7)          /* DAR update/not */
+#define DWC_CTLL_DST_DEC       (1<<7)
+#define DWC_CTLL_DST_FIX       (2<<7)
+#define DWC_CTLL_SRC_INC       (0<<7)          /* SAR update/not */
+#define DWC_CTLL_SRC_DEC       (1<<9)
+#define DWC_CTLL_SRC_FIX       (2<<9)
+#define DWC_CTLL_DST_MSIZE(n)  ((n)<<11)       /* burst, #elements */
+#define DWC_CTLL_SRC_MSIZE(n)  ((n)<<14)
+#define DWC_CTLL_S_GATH_EN     (1 << 17)       /* src gather, !FIX */
+#define DWC_CTLL_D_SCAT_EN     (1 << 18)       /* dst scatter, !FIX */
+#define DWC_CTLL_FC(n)         ((n) << 20)
+#define DWC_CTLL_FC_M2M                (0 << 20)       /* mem-to-mem */
+#define DWC_CTLL_FC_M2P                (1 << 20)       /* mem-to-periph */
+#define DWC_CTLL_FC_P2M                (2 << 20)       /* periph-to-mem */
+#define DWC_CTLL_FC_P2P                (3 << 20)       /* periph-to-periph */
+/* plus 4 transfer types for peripheral-as-flow-controller */
+#define DWC_CTLL_DMS(n)                ((n)<<23)       /* dst master select */
+#define DWC_CTLL_SMS(n)                ((n)<<25)       /* src master select */
+#define DWC_CTLL_LLP_D_EN      (1 << 27)       /* dest block chain */
+#define DWC_CTLL_LLP_S_EN      (1 << 28)       /* src block chain */
+
+/* Bitfields in CTL_HI */
+#define DWC_CTLH_DONE          0x00001000
+#define DWC_CTLH_BLOCK_TS_MASK 0x00000fff
+
+/* Bitfields in CFG_LO. Platform-configurable bits are in <linux/dw_dmac.h> */
+#define DWC_CFGL_CH_PRIOR_MASK (0x7 << 5)      /* priority mask */
+#define DWC_CFGL_CH_PRIOR(x)   ((x) << 5)      /* priority */
+#define DWC_CFGL_CH_SUSP       (1 << 8)        /* pause xfer */
+#define DWC_CFGL_FIFO_EMPTY    (1 << 9)        /* pause xfer */
+#define DWC_CFGL_HS_DST                (1 << 10)       /* handshake w/dst */
+#define DWC_CFGL_HS_SRC                (1 << 11)       /* handshake w/src */
+#define DWC_CFGL_MAX_BURST(x)  ((x) << 20)
+#define DWC_CFGL_RELOAD_SAR    (1 << 30)
+#define DWC_CFGL_RELOAD_DAR    (1 << 31)
+
+/* Bitfields in CFG_HI. Platform-configurable bits are in <linux/dw_dmac.h> */
+#define DWC_CFGH_DS_UPD_EN     (1 << 5)
+#define DWC_CFGH_SS_UPD_EN     (1 << 6)
+
+/* Bitfields in SGR */
+#define DWC_SGR_SGI(x)         ((x) << 0)
+#define DWC_SGR_SGC(x)         ((x) << 20)
+
+/* Bitfields in DSR */
+#define DWC_DSR_DSI(x)         ((x) << 0)
+#define DWC_DSR_DSC(x)         ((x) << 20)
+
+/* Bitfields in CFG */
+#define DW_CFG_DMA_EN          (1 << 0)
+
+enum dw_dmac_flags {
+       DW_DMA_IS_CYCLIC = 0,
+       DW_DMA_IS_SOFT_LLP = 1,
+};
+
+struct dw_dma_chan {
+       struct dma_chan                 chan;
+       void __iomem                    *ch_regs;
+       u8                              mask;
+       u8                              priority;
+       enum dma_transfer_direction     direction;
+       bool                            paused;
+       bool                            initialized;
+
+       /* software emulation of the LLP transfers */
+       struct list_head        *tx_node_active;
+
+       spinlock_t              lock;
+
+       /* these other elements are all protected by lock */
+       unsigned long           flags;
+       struct list_head        active_list;
+       struct list_head        queue;
+       struct list_head        free_list;
+       u32                     residue;
+       struct dw_cyclic_desc   *cdesc;
+
+       unsigned int            descs_allocated;
+
+       /* hardware configuration */
+       unsigned int            block_size;
+       bool                    nollp;
+
+       /* custom slave configuration */
+       unsigned int            request_line;
+       unsigned char           src_master;
+       unsigned char           dst_master;
+
+       /* configuration passed via DMA_SLAVE_CONFIG */
+       struct dma_slave_config dma_sconfig;
+};
+
+static inline struct dw_dma_chan_regs __iomem *
+__dwc_regs(struct dw_dma_chan *dwc)
+{
+       return dwc->ch_regs;
+}
+
+#define channel_readl(dwc, name) \
+       dma_readl_native(&(__dwc_regs(dwc)->name))
+#define channel_writel(dwc, name, val) \
+       dma_writel_native((val), &(__dwc_regs(dwc)->name))
+
+static inline struct dw_dma_chan *to_dw_dma_chan(struct dma_chan *chan)
+{
+       return container_of(chan, struct dw_dma_chan, chan);
+}
+
+struct dw_dma {
+       struct dma_device       dma;
+       void __iomem            *regs;
+       struct dma_pool         *desc_pool;
+       struct tasklet_struct   tasklet;
+       struct clk              *clk;
+
+       u8                      all_chan_mask;
+
+       /* hardware configuration */
+       unsigned char           nr_masters;
+       unsigned char           data_width[4];
+
+       struct dw_dma_chan      chan[0];
+};
+
+static inline struct dw_dma_regs __iomem *__dw_regs(struct dw_dma *dw)
+{
+       return dw->regs;
+}
+
+#define dma_readl(dw, name) \
+       dma_readl_native(&(__dw_regs(dw)->name))
+#define dma_writel(dw, name, val) \
+       dma_writel_native((val), &(__dw_regs(dw)->name))
+
+#define channel_set_bit(dw, reg, mask) \
+       dma_writel(dw, reg, ((mask) << 8) | (mask))
+#define channel_clear_bit(dw, reg, mask) \
+       dma_writel(dw, reg, ((mask) << 8) | 0)
+
+static inline struct dw_dma *to_dw_dma(struct dma_device *ddev)
+{
+       return container_of(ddev, struct dw_dma, dma);
+}
+
+/* LLI == Linked List Item; a.k.a. DMA block descriptor */
+struct dw_lli {
+       /* values that are not changed by hardware */
+       u32             sar;
+       u32             dar;
+       u32             llp;            /* chain to next lli */
+       u32             ctllo;
+       /* values that may get written back: */
+       u32             ctlhi;
+       /* sstat and dstat can snapshot peripheral register state.
+        * silicon config may discard either or both...
+        */
+       u32             sstat;
+       u32             dstat;
+};
+
+struct dw_desc {
+       /* FIRST values the hardware uses */
+       struct dw_lli                   lli;
+
+       /* THEN values for driver housekeeping */
+       struct list_head                desc_node;
+       struct list_head                tx_list;
+       struct dma_async_tx_descriptor  txd;
+       size_t                          len;
+       size_t                          total_len;
+};
+
+#define to_dw_desc(h)  list_entry(h, struct dw_desc, desc_node)
+
+static inline struct dw_desc *
+txd_to_dw_desc(struct dma_async_tx_descriptor *txd)
+{
+       return container_of(txd, struct dw_desc, txd);
+}