ASoC: add DAI and platform / DMA drivers for SH SIU
authorGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Fri, 22 Jan 2010 18:09:03 +0000 (19:09 +0100)
committerMark Brown <broonie@opensource.wolfsonmicro.com>
Mon, 25 Jan 2010 14:52:20 +0000 (14:52 +0000)
Several SuperH platforms, including sh7722, sh7343, sh7354, sh7367 include
a Sound Interface Unit (SIU). This patch adds DAI and platform / DMA
drivers for this interface.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
arch/sh/include/asm/siu.h [new file with mode: 0644]
sound/soc/sh/Kconfig
sound/soc/sh/Makefile
sound/soc/sh/siu.h [new file with mode: 0644]
sound/soc/sh/siu_dai.c [new file with mode: 0644]
sound/soc/sh/siu_pcm.c [new file with mode: 0644]

diff --git a/arch/sh/include/asm/siu.h b/arch/sh/include/asm/siu.h
new file mode 100644 (file)
index 0000000..57565a3
--- /dev/null
@@ -0,0 +1,26 @@
+/*
+ * platform header for the SIU ASoC driver
+ *
+ * Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
+ *
+ * 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 ASM_SIU_H
+#define ASM_SIU_H
+
+#include <asm/dma-sh.h>
+
+struct device;
+
+struct siu_platform {
+       struct device *dma_dev;
+       enum sh_dmae_slave_chan_id dma_slave_tx_a;
+       enum sh_dmae_slave_chan_id dma_slave_rx_a;
+       enum sh_dmae_slave_chan_id dma_slave_tx_b;
+       enum sh_dmae_slave_chan_id dma_slave_rx_b;
+};
+
+#endif /* ASM_SIU_H */
index 8072a6d1c4db78586f0b941e0f77d146a3fc5e9f..3f1cd5503342c15e3f524af5170dcd61f88262e5 100644 (file)
@@ -26,6 +26,12 @@ config SND_SOC_SH4_FSI
        help
          This option enables FSI sound support
 
+config SND_SOC_SH4_SIU
+       tristate
+       depends on (SUPERH || ARCH_SHMOBILE) && HAVE_CLK
+       select DMADEVICES
+       select SH_DMAE
+
 ##
 ## Boards
 ##
index 1d0ec0af74b7868f94a99cb9f398ed65bb6bcea5..5a97d2539d8424f41341a935099513dbcff4b838 100644 (file)
@@ -6,9 +6,11 @@ obj-$(CONFIG_SND_SOC_PCM_SH7760)       += snd-soc-dma-sh7760.o
 snd-soc-hac-objs       := hac.o
 snd-soc-ssi-objs       := ssi.o
 snd-soc-fsi-objs       := fsi.o
+snd-soc-siu-objs       := siu_pcm.o siu_dai.o
 obj-$(CONFIG_SND_SOC_SH4_HAC)  += snd-soc-hac.o
 obj-$(CONFIG_SND_SOC_SH4_SSI)  += snd-soc-ssi.o
 obj-$(CONFIG_SND_SOC_SH4_FSI)  += snd-soc-fsi.o
+obj-$(CONFIG_SND_SOC_SH4_SIU)  += snd-soc-siu.o
 
 ## boards
 snd-soc-sh7760-ac97-objs       := sh7760-ac97.o
diff --git a/sound/soc/sh/siu.h b/sound/soc/sh/siu.h
new file mode 100644 (file)
index 0000000..9cc04ab
--- /dev/null
@@ -0,0 +1,193 @@
+/*
+ * siu.h - ALSA SoC driver for Renesas SH7343, SH7722 SIU peripheral.
+ *
+ * Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
+ * Copyright (C) 2006 Carlos Munoz <carlos@kenati.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef SIU_H
+#define SIU_H
+
+/* Common kernel and user-space firmware-building defines and types */
+
+#define YRAM0_SIZE             (0x0040 / 4)            /* 16 */
+#define YRAM1_SIZE             (0x0080 / 4)            /* 32 */
+#define YRAM2_SIZE             (0x0040 / 4)            /* 16 */
+#define YRAM3_SIZE             (0x0080 / 4)            /* 32 */
+#define YRAM4_SIZE             (0x0080 / 4)            /* 32 */
+#define YRAM_DEF_SIZE          (YRAM0_SIZE + YRAM1_SIZE + YRAM2_SIZE + \
+                                YRAM3_SIZE + YRAM4_SIZE)
+#define YRAM_FIR_SIZE          (0x0400 / 4)            /* 256 */
+#define YRAM_IIR_SIZE          (0x0200 / 4)            /* 128 */
+
+#define XRAM0_SIZE             (0x0400 / 4)            /* 256 */
+#define XRAM1_SIZE             (0x0200 / 4)            /* 128 */
+#define XRAM2_SIZE             (0x0200 / 4)            /* 128 */
+
+/* PRAM program array size */
+#define PRAM0_SIZE             (0x0100 / 4)            /* 64 */
+#define PRAM1_SIZE             ((0x2000 - 0x0100) / 4) /* 1984 */
+
+#include <linux/types.h>
+
+struct siu_spb_param {
+       __u32   ab1a;   /* input FIFO address */
+       __u32   ab0a;   /* output FIFO address */
+       __u32   dir;    /* 0=the ather except CPUOUTPUT, 1=CPUINPUT */
+       __u32   event;  /* SPB program starting conditions */
+       __u32   stfifo; /* STFIFO register setting value */
+       __u32   trdat;  /* TRDAT register setting value */
+};
+
+struct siu_firmware {
+       __u32                   yram_fir_coeff[YRAM_FIR_SIZE];
+       __u32                   pram0[PRAM0_SIZE];
+       __u32                   pram1[PRAM1_SIZE];
+       __u32                   yram0[YRAM0_SIZE];
+       __u32                   yram1[YRAM1_SIZE];
+       __u32                   yram2[YRAM2_SIZE];
+       __u32                   yram3[YRAM3_SIZE];
+       __u32                   yram4[YRAM4_SIZE];
+       __u32                   spbpar_num;
+       struct siu_spb_param    spbpar[32];
+};
+
+#ifdef __KERNEL__
+
+#include <linux/dmaengine.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+
+#include <asm/dma-sh.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/soc-dai.h>
+
+#define SIU_PERIOD_BYTES_MAX   8192            /* DMA transfer/period size */
+#define SIU_PERIOD_BYTES_MIN   256             /* DMA transfer/period size */
+#define SIU_PERIODS_MAX                64              /* Max periods in buffer */
+#define SIU_PERIODS_MIN                4               /* Min periods in buffer */
+#define SIU_BUFFER_BYTES_MAX   (SIU_PERIOD_BYTES_MAX * SIU_PERIODS_MAX)
+
+/* SIU ports: only one can be used at a time */
+enum {
+       SIU_PORT_A,
+       SIU_PORT_B,
+       SIU_PORT_NUM,
+};
+
+/* SIU clock configuration */
+enum {
+       SIU_CLKA_PLL,
+       SIU_CLKA_EXT,
+       SIU_CLKB_PLL,
+       SIU_CLKB_EXT
+};
+
+struct siu_info {
+       int                     port_id;
+       u32 __iomem             *pram;
+       u32 __iomem             *xram;
+       u32 __iomem             *yram;
+       u32 __iomem             *reg;
+       struct siu_firmware     fw;
+};
+
+struct siu_stream {
+       struct tasklet_struct           tasklet;
+       struct snd_pcm_substream        *substream;
+       snd_pcm_format_t                format;
+       size_t                          buf_bytes;
+       size_t                          period_bytes;
+       int                             cur_period;     /* Period currently in dma */
+       u32                             volume;
+       snd_pcm_sframes_t               xfer_cnt;       /* Number of frames */
+       u8                              rw_flg;         /* transfer status */
+       /* DMA status */
+       struct dma_chan                 *chan;          /* DMA channel */
+       struct dma_async_tx_descriptor  *tx_desc;
+       dma_cookie_t                    cookie;
+       struct sh_dmae_slave            param;
+};
+
+struct siu_port {
+       unsigned long           play_cap;       /* Used to track full duplex */
+       struct snd_pcm          *pcm;
+       struct siu_stream       playback;
+       struct siu_stream       capture;
+       u32                     stfifo;         /* STFIFO value from firmware */
+       u32                     trdat;          /* TRDAT value from firmware */
+};
+
+extern struct siu_port *siu_ports[SIU_PORT_NUM];
+
+static inline struct siu_port *siu_port_info(struct snd_pcm_substream *substream)
+{
+       struct platform_device *pdev =
+               to_platform_device(substream->pcm->card->dev);
+       return siu_ports[pdev->id];
+}
+
+/* Register access */
+static inline void siu_write32(u32 __iomem *addr, u32 val)
+{
+       __raw_writel(val, addr);
+}
+
+static inline u32 siu_read32(u32 __iomem *addr)
+{
+       return __raw_readl(addr);
+}
+
+/* SIU registers */
+#define SIU_IFCTL      (0x000 / sizeof(u32))
+#define SIU_SRCTL      (0x004 / sizeof(u32))
+#define SIU_SFORM      (0x008 / sizeof(u32))
+#define SIU_CKCTL      (0x00c / sizeof(u32))
+#define SIU_TRDAT      (0x010 / sizeof(u32))
+#define SIU_STFIFO     (0x014 / sizeof(u32))
+#define SIU_DPAK       (0x01c / sizeof(u32))
+#define SIU_CKREV      (0x020 / sizeof(u32))
+#define SIU_EVNTC      (0x028 / sizeof(u32))
+#define SIU_SBCTL      (0x040 / sizeof(u32))
+#define SIU_SBPSET     (0x044 / sizeof(u32))
+#define SIU_SBFSTS     (0x068 / sizeof(u32))
+#define SIU_SBDVCA     (0x06c / sizeof(u32))
+#define SIU_SBDVCB     (0x070 / sizeof(u32))
+#define SIU_SBACTIV    (0x074 / sizeof(u32))
+#define SIU_DMAIA      (0x090 / sizeof(u32))
+#define SIU_DMAIB      (0x094 / sizeof(u32))
+#define SIU_DMAOA      (0x098 / sizeof(u32))
+#define SIU_DMAOB      (0x09c / sizeof(u32))
+#define SIU_DMAML      (0x0a0 / sizeof(u32))
+#define SIU_SPSTS      (0x0cc / sizeof(u32))
+#define SIU_SPCTL      (0x0d0 / sizeof(u32))
+#define SIU_BRGASEL    (0x100 / sizeof(u32))
+#define SIU_BRRA       (0x104 / sizeof(u32))
+#define SIU_BRGBSEL    (0x108 / sizeof(u32))
+#define SIU_BRRB       (0x10c / sizeof(u32))
+
+extern struct snd_soc_platform siu_platform;
+extern struct snd_soc_dai siu_i2s_dai;
+
+int siu_init_port(int port, struct siu_port **port_info, struct snd_card *card);
+void siu_free_port(struct siu_port *port_info);
+
+#endif
+
+#endif /* SIU_H */
diff --git a/sound/soc/sh/siu_dai.c b/sound/soc/sh/siu_dai.c
new file mode 100644 (file)
index 0000000..5452d19
--- /dev/null
@@ -0,0 +1,847 @@
+/*
+ * siu_dai.c - ALSA SoC driver for Renesas SH7343, SH7722 SIU peripheral.
+ *
+ * Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
+ * Copyright (C) 2006 Carlos Munoz <carlos@kenati.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/delay.h>
+#include <linux/firmware.h>
+#include <linux/pm_runtime.h>
+
+#include <asm/clock.h>
+#include <asm/siu.h>
+
+#include <sound/control.h>
+#include <sound/soc-dai.h>
+
+#include "siu.h"
+
+/* Board specifics */
+#if defined(CONFIG_CPU_SUBTYPE_SH7722)
+# define SIU_MAX_VOLUME                0x1000
+#else
+# define SIU_MAX_VOLUME                0x7fff
+#endif
+
+#define PRAM_SIZE      0x2000
+#define XRAM_SIZE      0x800
+#define YRAM_SIZE      0x800
+
+#define XRAM_OFFSET    0x4000
+#define YRAM_OFFSET    0x6000
+#define REG_OFFSET     0xc000
+
+#define PLAYBACK_ENABLED       1
+#define CAPTURE_ENABLED                2
+
+#define VOLUME_CAPTURE         0
+#define VOLUME_PLAYBACK                1
+#define DFLT_VOLUME_LEVEL      0x08000800
+
+/*
+ * SPDIF is only available on port A and on some SIU implementations it is only
+ * available for input. Due to the lack of hardware to test it, SPDIF is left
+ * disabled in this driver version
+ */
+struct format_flag {
+       u32     i2s;
+       u32     pcm;
+       u32     spdif;
+       u32     mask;
+};
+
+struct port_flag {
+       struct format_flag      playback;
+       struct format_flag      capture;
+};
+
+static struct port_flag siu_flags[SIU_PORT_NUM] = {
+       [SIU_PORT_A] = {
+               .playback = {
+                       .i2s    = 0x50000000,
+                       .pcm    = 0x40000000,
+                       .spdif  = 0x80000000,   /* not on all SIU versions */
+                       .mask   = 0xd0000000,
+               },
+               .capture = {
+                       .i2s    = 0x05000000,
+                       .pcm    = 0x04000000,
+                       .spdif  = 0x08000000,
+                       .mask   = 0x0d000000,
+               },
+       },
+       [SIU_PORT_B] = {
+               .playback = {
+                       .i2s    = 0x00500000,
+                       .pcm    = 0x00400000,
+                       .spdif  = 0,            /* impossible - turn off */
+                       .mask   = 0x00500000,
+               },
+               .capture = {
+                       .i2s    = 0x00050000,
+                       .pcm    = 0x00040000,
+                       .spdif  = 0,            /* impossible - turn off */
+                       .mask   = 0x00050000,
+               },
+       },
+};
+
+static void siu_dai_start(struct siu_port *port_info)
+{
+       struct siu_info *info = siu_i2s_dai.private_data;
+       u32 __iomem *base = info->reg;
+
+       dev_dbg(port_info->pcm->card->dev, "%s\n", __func__);
+
+       /* Turn on SIU clock */
+       pm_runtime_get_sync(siu_i2s_dai.dev);
+
+       /* Issue software reset to siu */
+       siu_write32(base + SIU_SRCTL, 0);
+
+       /* Wait for the reset to take effect */
+       udelay(1);
+
+       port_info->stfifo = 0;
+       port_info->trdat = 0;
+
+       /* portA, portB, SIU operate */
+       siu_write32(base + SIU_SRCTL, 0x301);
+
+       /* portA=256fs, portB=256fs */
+       siu_write32(base + SIU_CKCTL, 0x40400000);
+
+       /* portA's BRG does not divide SIUCKA */
+       siu_write32(base + SIU_BRGASEL, 0);
+       siu_write32(base + SIU_BRRA, 0);
+
+       /* portB's BRG divides SIUCKB by half */
+       siu_write32(base + SIU_BRGBSEL, 1);
+       siu_write32(base + SIU_BRRB, 0);
+
+       siu_write32(base + SIU_IFCTL, 0x44440000);
+
+       /* portA: 32 bit/fs, master; portB: 32 bit/fs, master */
+       siu_write32(base + SIU_SFORM, 0x0c0c0000);
+
+       /*
+        * Volume levels: looks like the DSP firmware implements volume controls
+        * differently from what's described in the datasheet
+        */
+       siu_write32(base + SIU_SBDVCA, port_info->playback.volume);
+       siu_write32(base + SIU_SBDVCB, port_info->capture.volume);
+}
+
+static void siu_dai_stop(void)
+{
+       struct siu_info *info = siu_i2s_dai.private_data;
+       u32 __iomem *base = info->reg;
+
+       /* SIU software reset */
+       siu_write32(base + SIU_SRCTL, 0);
+
+       /* Turn off SIU clock */
+       pm_runtime_put_sync(siu_i2s_dai.dev);
+}
+
+static void siu_dai_spbAselect(struct siu_port *port_info)
+{
+       struct siu_info *info = siu_i2s_dai.private_data;
+       struct siu_firmware *fw = &info->fw;
+       u32 *ydef = fw->yram0;
+       u32 idx;
+
+       /* path A use */
+       if (!info->port_id)
+               idx = 1;                /* portA */
+       else
+               idx = 2;                /* portB */
+
+       ydef[0] = (fw->spbpar[idx].ab1a << 16) |
+               (fw->spbpar[idx].ab0a << 8) |
+               (fw->spbpar[idx].dir << 7) | 3;
+       ydef[1] = fw->yram0[1]; /* 0x03000300 */
+       ydef[2] = (16 / 2) << 24;
+       ydef[3] = fw->yram0[3]; /* 0 */
+       ydef[4] = fw->yram0[4]; /* 0 */
+       ydef[7] = fw->spbpar[idx].event;
+       port_info->stfifo |= fw->spbpar[idx].stfifo;
+       port_info->trdat |= fw->spbpar[idx].trdat;
+}
+
+static void siu_dai_spbBselect(struct siu_port *port_info)
+{
+       struct siu_info *info = siu_i2s_dai.private_data;
+       struct siu_firmware *fw = &info->fw;
+       u32 *ydef = fw->yram0;
+       u32 idx;
+
+       /* path B use */
+       if (!info->port_id)
+               idx = 7;                /* portA */
+       else
+               idx = 8;                /* portB */
+
+       ydef[5] = (fw->spbpar[idx].ab1a << 16) |
+               (fw->spbpar[idx].ab0a << 8) | 1;
+       ydef[6] = fw->spbpar[idx].event;
+       port_info->stfifo |= fw->spbpar[idx].stfifo;
+       port_info->trdat |= fw->spbpar[idx].trdat;
+}
+
+static void siu_dai_open(struct siu_stream *siu_stream)
+{
+       struct siu_info *info = siu_i2s_dai.private_data;
+       u32 __iomem *base = info->reg;
+       u32 srctl, ifctl;
+
+       srctl = siu_read32(base + SIU_SRCTL);
+       ifctl = siu_read32(base + SIU_IFCTL);
+
+       switch (info->port_id) {
+       case SIU_PORT_A:
+               /* portA operates */
+               srctl |= 0x200;
+               ifctl &= ~0xc2;
+               break;
+       case SIU_PORT_B:
+               /* portB operates */
+               srctl |= 0x100;
+               ifctl &= ~0x31;
+               break;
+       }
+
+       siu_write32(base + SIU_SRCTL, srctl);
+       /* Unmute and configure portA */
+       siu_write32(base + SIU_IFCTL, ifctl);
+}
+
+/*
+ * At the moment only fixed Left-upper, Left-lower, Right-upper, Right-lower
+ * packing is supported
+ */
+static void siu_dai_pcmdatapack(struct siu_stream *siu_stream)
+{
+       struct siu_info *info = siu_i2s_dai.private_data;
+       u32 __iomem *base = info->reg;
+       u32 dpak;
+
+       dpak = siu_read32(base + SIU_DPAK);
+
+       switch (info->port_id) {
+       case SIU_PORT_A:
+               dpak &= ~0xc0000000;
+               break;
+       case SIU_PORT_B:
+               dpak &= ~0x00c00000;
+               break;
+       }
+
+       siu_write32(base + SIU_DPAK, dpak);
+}
+
+static int siu_dai_spbstart(struct siu_port *port_info)
+{
+       struct siu_info *info = siu_i2s_dai.private_data;
+       u32 __iomem *base = info->reg;
+       struct siu_firmware *fw = &info->fw;
+       u32 *ydef = fw->yram0;
+       int cnt;
+       u32 __iomem *add;
+       u32 *ptr;
+
+       /* Load SPB Program in PRAM */
+       ptr = fw->pram0;
+       add = info->pram;
+       for (cnt = 0; cnt < PRAM0_SIZE; cnt++, add++, ptr++)
+               siu_write32(add, *ptr);
+
+       ptr = fw->pram1;
+       add = info->pram + (0x0100 / sizeof(u32));
+       for (cnt = 0; cnt < PRAM1_SIZE; cnt++, add++, ptr++)
+               siu_write32(add, *ptr);
+
+       /* XRAM initialization */
+       add = info->xram;
+       for (cnt = 0; cnt < XRAM0_SIZE + XRAM1_SIZE + XRAM2_SIZE; cnt++, add++)
+               siu_write32(add, 0);
+
+       /* YRAM variable area initialization */
+       add = info->yram;
+       for (cnt = 0; cnt < YRAM_DEF_SIZE; cnt++, add++)
+               siu_write32(add, ydef[cnt]);
+
+       /* YRAM FIR coefficient area initialization */
+       add = info->yram + (0x0200 / sizeof(u32));
+       for (cnt = 0; cnt < YRAM_FIR_SIZE; cnt++, add++)
+               siu_write32(add, fw->yram_fir_coeff[cnt]);
+
+       /* YRAM IIR coefficient area initialization */
+       add = info->yram + (0x0600 / sizeof(u32));
+       for (cnt = 0; cnt < YRAM_IIR_SIZE; cnt++, add++)
+               siu_write32(add, 0);
+
+       siu_write32(base + SIU_TRDAT, port_info->trdat);
+       port_info->trdat = 0x0;
+
+
+       /* SPB start condition: software */
+       siu_write32(base + SIU_SBACTIV, 0);
+       /* Start SPB */
+       siu_write32(base + SIU_SBCTL, 0xc0000000);
+       /* Wait for program to halt */
+       cnt = 0x10000;
+       while (--cnt && siu_read32(base + SIU_SBCTL) != 0x80000000)
+               cpu_relax();
+
+       if (!cnt)
+               return -EBUSY;
+
+       /* SPB program start address setting */
+       siu_write32(base + SIU_SBPSET, 0x00400000);
+       /* SPB hardware start(FIFOCTL source) */
+       siu_write32(base + SIU_SBACTIV, 0xc0000000);
+
+       return 0;
+}
+
+static void siu_dai_spbstop(struct siu_port *port_info)
+{
+       struct siu_info *info = siu_i2s_dai.private_data;
+       u32 __iomem *base = info->reg;
+
+       siu_write32(base + SIU_SBACTIV, 0);
+       /* SPB stop */
+       siu_write32(base + SIU_SBCTL, 0);
+
+       port_info->stfifo = 0;
+}
+
+/*             API functions           */
+
+/* Playback and capture hardware properties are identical */
+static struct snd_pcm_hardware siu_dai_pcm_hw = {
+       .info                   = SNDRV_PCM_INFO_INTERLEAVED,
+       .formats                = SNDRV_PCM_FMTBIT_S16,
+       .rates                  = SNDRV_PCM_RATE_8000_48000,
+       .rate_min               = 8000,
+       .rate_max               = 48000,
+       .channels_min           = 2,
+       .channels_max           = 2,
+       .buffer_bytes_max       = SIU_BUFFER_BYTES_MAX,
+       .period_bytes_min       = SIU_PERIOD_BYTES_MIN,
+       .period_bytes_max       = SIU_PERIOD_BYTES_MAX,
+       .periods_min            = SIU_PERIODS_MIN,
+       .periods_max            = SIU_PERIODS_MAX,
+};
+
+static int siu_dai_info_volume(struct snd_kcontrol *kctrl,
+                              struct snd_ctl_elem_info *uinfo)
+{
+       struct siu_port *port_info = snd_kcontrol_chip(kctrl);
+
+       dev_dbg(port_info->pcm->card->dev, "%s\n", __func__);
+
+       uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+       uinfo->count = 2;
+       uinfo->value.integer.min = 0;
+       uinfo->value.integer.max = SIU_MAX_VOLUME;
+
+       return 0;
+}
+
+static int siu_dai_get_volume(struct snd_kcontrol *kctrl,
+                             struct snd_ctl_elem_value *ucontrol)
+{
+       struct siu_port *port_info = snd_kcontrol_chip(kctrl);
+       struct device *dev = port_info->pcm->card->dev;
+       u32 vol;
+
+       dev_dbg(dev, "%s\n", __func__);
+
+       switch (kctrl->private_value) {
+       case VOLUME_PLAYBACK:
+               /* Playback is always on port 0 */
+               vol = port_info->playback.volume;
+               ucontrol->value.integer.value[0] = vol & 0xffff;
+               ucontrol->value.integer.value[1] = vol >> 16 & 0xffff;
+               break;
+       case VOLUME_CAPTURE:
+               /* Capture is always on port 1 */
+               vol = port_info->capture.volume;
+               ucontrol->value.integer.value[0] = vol & 0xffff;
+               ucontrol->value.integer.value[1] = vol >> 16 & 0xffff;
+               break;
+       default:
+               dev_err(dev, "%s() invalid private_value=%ld\n",
+                       __func__, kctrl->private_value);
+               return -EINVAL;
+       }
+
+       return 0;
+}
+
+static int siu_dai_put_volume(struct snd_kcontrol *kctrl,
+                             struct snd_ctl_elem_value *ucontrol)
+{
+       struct siu_port *port_info = snd_kcontrol_chip(kctrl);
+       struct device *dev = port_info->pcm->card->dev;
+       struct siu_info *info = siu_i2s_dai.private_data;
+       u32 __iomem *base = info->reg;
+       u32 new_vol;
+       u32 cur_vol;
+
+       dev_dbg(dev, "%s\n", __func__);
+
+       if (ucontrol->value.integer.value[0] < 0 ||
+           ucontrol->value.integer.value[0] > SIU_MAX_VOLUME ||
+           ucontrol->value.integer.value[1] < 0 ||
+           ucontrol->value.integer.value[1] > SIU_MAX_VOLUME)
+               return -EINVAL;
+
+       new_vol = ucontrol->value.integer.value[0] |
+               ucontrol->value.integer.value[1] << 16;
+
+       /* See comment above - DSP firmware implementation */
+       switch (kctrl->private_value) {
+       case VOLUME_PLAYBACK:
+               /* Playback is always on port 0 */
+               cur_vol = port_info->playback.volume;
+               siu_write32(base + SIU_SBDVCA, new_vol);
+               port_info->playback.volume = new_vol;
+               break;
+       case VOLUME_CAPTURE:
+               /* Capture is always on port 1 */
+               cur_vol = port_info->capture.volume;
+               siu_write32(base + SIU_SBDVCB, new_vol);
+               port_info->capture.volume = new_vol;
+               break;
+       default:
+               dev_err(dev, "%s() invalid private_value=%ld\n",
+                       __func__, kctrl->private_value);
+               return -EINVAL;
+       }
+
+       if (cur_vol != new_vol)
+               return 1;
+
+       return 0;
+}
+
+static struct snd_kcontrol_new playback_controls = {
+       .iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
+       .name           = "PCM Playback Volume",
+       .index          = 0,
+       .info           = siu_dai_info_volume,
+       .get            = siu_dai_get_volume,
+       .put            = siu_dai_put_volume,
+       .private_value  = VOLUME_PLAYBACK,
+};
+
+static struct snd_kcontrol_new capture_controls = {
+       .iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
+       .name           = "PCM Capture Volume",
+       .index          = 0,
+       .info           = siu_dai_info_volume,
+       .get            = siu_dai_get_volume,
+       .put            = siu_dai_put_volume,
+       .private_value  = VOLUME_CAPTURE,
+};
+
+int siu_init_port(int port, struct siu_port **port_info, struct snd_card *card)
+{
+       struct device *dev = card->dev;
+       struct snd_kcontrol *kctrl;
+       int ret;
+
+       *port_info = kzalloc(sizeof(**port_info), GFP_KERNEL);
+       if (!*port_info)
+               return -ENOMEM;
+
+       dev_dbg(dev, "%s: port #%d@%p\n", __func__, port, *port_info);
+
+       (*port_info)->playback.volume = DFLT_VOLUME_LEVEL;
+       (*port_info)->capture.volume = DFLT_VOLUME_LEVEL;
+
+       /*
+        * Add mixer support. The SPB is used to change the volume. Both
+        * ports use the same SPB. Therefore, we only register one
+        * control instance since it will be used by both channels.
+        * In error case we continue without controls.
+        */
+       kctrl = snd_ctl_new1(&playback_controls, *port_info);
+       ret = snd_ctl_add(card, kctrl);
+       if (ret < 0)
+               dev_err(dev,
+                       "failed to add playback controls %p port=%d err=%d\n",
+                       kctrl, port, ret);
+
+       kctrl = snd_ctl_new1(&capture_controls, *port_info);
+       ret = snd_ctl_add(card, kctrl);
+       if (ret < 0)
+               dev_err(dev,
+                       "failed to add capture controls %p port=%d err=%d\n",
+                       kctrl, port, ret);
+
+       return 0;
+}
+
+void siu_free_port(struct siu_port *port_info)
+{
+       kfree(port_info);
+}
+
+static int siu_dai_startup(struct snd_pcm_substream *substream,
+                          struct snd_soc_dai *dai)
+{
+       struct siu_info *info = siu_i2s_dai.private_data;
+       struct snd_pcm_runtime *rt = substream->runtime;
+       struct siu_port *port_info = siu_port_info(substream);
+       int ret;
+
+       dev_dbg(substream->pcm->card->dev, "%s: port=%d@%p\n", __func__,
+               info->port_id, port_info);
+
+       snd_soc_set_runtime_hwparams(substream, &siu_dai_pcm_hw);
+
+       ret = snd_pcm_hw_constraint_integer(rt, SNDRV_PCM_HW_PARAM_PERIODS);
+       if (unlikely(ret < 0))
+               return ret;
+
+       siu_dai_start(port_info);
+
+       return 0;
+}
+
+static void siu_dai_shutdown(struct snd_pcm_substream *substream,
+                            struct snd_soc_dai *dai)
+{
+       struct siu_info *info = siu_i2s_dai.private_data;
+       struct siu_port *port_info = siu_port_info(substream);
+
+       dev_dbg(substream->pcm->card->dev, "%s: port=%d@%p\n", __func__,
+               info->port_id, port_info);
+
+       if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+               port_info->play_cap &= ~PLAYBACK_ENABLED;
+       else
+               port_info->play_cap &= ~CAPTURE_ENABLED;
+
+       /* Stop the siu if the other stream is not using it */
+       if (!port_info->play_cap) {
+               /* during stmread or stmwrite ? */
+               BUG_ON(port_info->playback.rw_flg || port_info->capture.rw_flg);
+               siu_dai_spbstop(port_info);
+               siu_dai_stop();
+       }
+}
+
+/* PCM part of siu_dai_playback_prepare() / siu_dai_capture_prepare() */
+static int siu_dai_prepare(struct snd_pcm_substream *substream,
+                          struct snd_soc_dai *dai)
+{
+       struct siu_info *info = siu_i2s_dai.private_data;
+       struct snd_pcm_runtime *rt = substream->runtime;
+       struct siu_port *port_info = siu_port_info(substream);
+       struct siu_stream *siu_stream;
+       int self, ret;
+
+       dev_dbg(substream->pcm->card->dev,
+               "%s: port %d, active streams %lx, %d channels\n",
+               __func__, info->port_id, port_info->play_cap, rt->channels);
+
+       if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+               self = PLAYBACK_ENABLED;
+               siu_stream = &port_info->playback;
+       } else {
+               self = CAPTURE_ENABLED;
+               siu_stream = &port_info->capture;
+       }
+
+       /* Set up the siu if not already done */
+       if (!port_info->play_cap) {
+               siu_stream->rw_flg = 0; /* stream-data transfer flag */
+
+               siu_dai_spbAselect(port_info);
+               siu_dai_spbBselect(port_info);
+
+               siu_dai_open(siu_stream);
+
+               siu_dai_pcmdatapack(siu_stream);
+
+               ret = siu_dai_spbstart(port_info);
+               if (ret < 0)
+                       goto fail;
+       }
+
+       port_info->play_cap |= self;
+
+fail:
+       return ret;
+}
+
+/*
+ * SIU can set bus format to I2S / PCM / SPDIF independently for playback and
+ * capture, however, the current API sets the bus format globally for a DAI.
+ */
+static int siu_dai_set_fmt(struct snd_soc_dai *dai,
+                          unsigned int fmt)
+{
+       struct siu_info *info = siu_i2s_dai.private_data;
+       u32 __iomem *base = info->reg;
+       u32 ifctl;
+
+       dev_dbg(dai->dev, "%s: fmt 0x%x on port %d\n",
+               __func__, fmt, info->port_id);
+
+       if (info->port_id < 0)
+               return -ENODEV;
+
+       /* Here select between I2S / PCM / SPDIF */
+       switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+       case SND_SOC_DAIFMT_I2S:
+               ifctl = siu_flags[info->port_id].playback.i2s |
+                       siu_flags[info->port_id].capture.i2s;
+               break;
+       case SND_SOC_DAIFMT_LEFT_J:
+               ifctl = siu_flags[info->port_id].playback.pcm |
+                       siu_flags[info->port_id].capture.pcm;
+               break;
+       /* SPDIF disabled - see comment at the top */
+       default:
+               return -EINVAL;
+       }
+
+       ifctl |= ~(siu_flags[info->port_id].playback.mask |
+                  siu_flags[info->port_id].capture.mask) &
+               siu_read32(base + SIU_IFCTL);
+       siu_write32(base + SIU_IFCTL, ifctl);
+
+       return 0;
+}
+
+static int siu_dai_set_sysclk(struct snd_soc_dai *dai, int clk_id,
+                             unsigned int freq, int dir)
+{
+       struct clk *siu_clk, *parent_clk;
+       char *siu_name, *parent_name;
+       int ret;
+
+       if (dir != SND_SOC_CLOCK_IN)
+               return -EINVAL;
+
+       dev_dbg(dai->dev, "%s: using clock %d\n", __func__, clk_id);
+
+       switch (clk_id) {
+       case SIU_CLKA_PLL:
+               siu_name = "siua_clk";
+               parent_name = "pll_clk";
+               break;
+       case SIU_CLKA_EXT:
+               siu_name = "siua_clk";
+               parent_name = "siumcka_clk";
+               break;
+       case SIU_CLKB_PLL:
+               siu_name = "siub_clk";
+               parent_name = "pll_clk";
+               break;
+       case SIU_CLKB_EXT:
+               siu_name = "siub_clk";
+               parent_name = "siumckb_clk";
+               break;
+       default:
+               return -EINVAL;
+       }
+
+       siu_clk = clk_get(siu_i2s_dai.dev, siu_name);
+       if (IS_ERR(siu_clk))
+               return PTR_ERR(siu_clk);
+
+       parent_clk = clk_get(siu_i2s_dai.dev, parent_name);
+       if (!IS_ERR(parent_clk)) {
+               ret = clk_set_parent(siu_clk, parent_clk);
+               if (!ret)
+                       clk_set_rate(siu_clk, freq);
+               clk_put(parent_clk);
+       }
+
+       clk_put(siu_clk);
+
+       return 0;
+}
+
+static struct snd_soc_dai_ops siu_dai_ops = {
+       .startup        = siu_dai_startup,
+       .shutdown       = siu_dai_shutdown,
+       .prepare        = siu_dai_prepare,
+       .set_sysclk     = siu_dai_set_sysclk,
+       .set_fmt        = siu_dai_set_fmt,
+};
+
+struct snd_soc_dai siu_i2s_dai = {
+       .name = "sh-siu",
+       .id = 0,
+       .playback = {
+               .channels_min = 2,
+               .channels_max = 2,
+               .formats = SNDRV_PCM_FMTBIT_S16,
+               .rates = SNDRV_PCM_RATE_8000_48000,
+       },
+       .capture = {
+               .channels_min = 2,
+               .channels_max = 2,
+               .formats = SNDRV_PCM_FMTBIT_S16,
+               .rates = SNDRV_PCM_RATE_8000_48000,
+        },
+       .ops = &siu_dai_ops,
+};
+EXPORT_SYMBOL_GPL(siu_i2s_dai);
+
+static int __devinit siu_probe(struct platform_device *pdev)
+{
+       const struct firmware *fw_entry;
+       struct resource *res, *region;
+       struct siu_info *info;
+       int ret;
+
+       info = kmalloc(sizeof(*info), GFP_KERNEL);
+       if (!info)
+               return -ENOMEM;
+
+       ret = request_firmware(&fw_entry, "siu_spb.bin", &pdev->dev);
+       if (ret)
+               goto ereqfw;
+
+       /*
+        * Loaded firmware is "const" - read only, but we have to modify it in
+        * snd_siu_sh7343_spbAselect() and snd_siu_sh7343_spbBselect()
+        */
+       memcpy(&info->fw, fw_entry->data, fw_entry->size);
+
+       release_firmware(fw_entry);
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (!res) {
+               ret = -ENODEV;
+               goto egetres;
+       }
+
+       region = request_mem_region(res->start, resource_size(res),
+                                   pdev->name);
+       if (!region) {
+               dev_err(&pdev->dev, "SIU region already claimed\n");
+               ret = -EBUSY;
+               goto ereqmemreg;
+       }
+
+       ret = -ENOMEM;
+       info->pram = ioremap(res->start, PRAM_SIZE);
+       if (!info->pram)
+               goto emappram;
+       info->xram = ioremap(res->start + XRAM_OFFSET, XRAM_SIZE);
+       if (!info->xram)
+               goto emapxram;
+       info->yram = ioremap(res->start + YRAM_OFFSET, YRAM_SIZE);
+       if (!info->yram)
+               goto emapyram;
+       info->reg = ioremap(res->start + REG_OFFSET, resource_size(res) -
+                           REG_OFFSET);
+       if (!info->reg)
+               goto emapreg;
+
+       siu_i2s_dai.dev = &pdev->dev;
+       siu_i2s_dai.private_data = info;
+
+       ret = snd_soc_register_dais(&siu_i2s_dai, 1);
+       if (ret < 0)
+               goto edaiinit;
+
+       ret = snd_soc_register_platform(&siu_platform);
+       if (ret < 0)
+               goto esocregp;
+
+       pm_runtime_enable(&pdev->dev);
+
+       return ret;
+
+esocregp:
+       snd_soc_unregister_dais(&siu_i2s_dai, 1);
+edaiinit:
+       iounmap(info->reg);
+emapreg:
+       iounmap(info->yram);
+emapyram:
+       iounmap(info->xram);
+emapxram:
+       iounmap(info->pram);
+emappram:
+       release_mem_region(res->start, resource_size(res));
+ereqmemreg:
+egetres:
+ereqfw:
+       kfree(info);
+
+       return ret;
+}
+
+static int __devexit siu_remove(struct platform_device *pdev)
+{
+       struct siu_info *info = siu_i2s_dai.private_data;
+       struct resource *res;
+
+       pm_runtime_disable(&pdev->dev);
+
+       snd_soc_unregister_platform(&siu_platform);
+       snd_soc_unregister_dais(&siu_i2s_dai, 1);
+
+       iounmap(info->reg);
+       iounmap(info->yram);
+       iounmap(info->xram);
+       iounmap(info->pram);
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (res)
+               release_mem_region(res->start, resource_size(res));
+       kfree(info);
+
+       return 0;
+}
+
+static struct platform_driver siu_driver = {
+       .driver         = {
+               .name   = "sh_siu",
+       },
+       .probe          = siu_probe,
+       .remove         = __devexit_p(siu_remove),
+};
+
+static int __init siu_init(void)
+{
+       return platform_driver_register(&siu_driver);
+}
+
+static void __exit siu_exit(void)
+{
+       platform_driver_unregister(&siu_driver);
+}
+
+module_init(siu_init)
+module_exit(siu_exit)
+
+MODULE_AUTHOR("Carlos Munoz <carlos@kenati.com>");
+MODULE_DESCRIPTION("ALSA SoC SH7722 SIU driver");
+MODULE_LICENSE("GPL");
diff --git a/sound/soc/sh/siu_pcm.c b/sound/soc/sh/siu_pcm.c
new file mode 100644 (file)
index 0000000..c5efc30
--- /dev/null
@@ -0,0 +1,616 @@
+/*
+ * siu_pcm.c - ALSA driver for Renesas SH7343, SH7722 SIU peripheral.
+ *
+ * Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
+ * Copyright (C) 2006 Carlos Munoz <carlos@kenati.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <sound/control.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc-dai.h>
+
+#include <asm/dma-sh.h>
+#include <asm/siu.h>
+
+#include "siu.h"
+
+#define GET_MAX_PERIODS(buf_bytes, period_bytes) \
+                               ((buf_bytes) / (period_bytes))
+#define PERIOD_OFFSET(buf_addr, period_num, period_bytes) \
+                               ((buf_addr) + ((period_num) * (period_bytes)))
+
+#define RWF_STM_RD             0x01            /* Read in progress */
+#define RWF_STM_WT             0x02            /* Write in progress */
+
+struct siu_port *siu_ports[SIU_PORT_NUM];
+
+/* transfersize is number of u32 dma transfers per period */
+static int siu_pcm_stmwrite_stop(struct siu_port *port_info)
+{
+       struct siu_info *info = siu_i2s_dai.private_data;
+       u32 __iomem *base = info->reg;
+       struct siu_stream *siu_stream = &port_info->playback;
+       u32 stfifo;
+
+       if (!siu_stream->rw_flg)
+               return -EPERM;
+
+       /* output FIFO disable */
+       stfifo = siu_read32(base + SIU_STFIFO);
+       siu_write32(base + SIU_STFIFO, stfifo & ~0x0c180c18);
+       pr_debug("%s: STFIFO %x -> %x\n", __func__,
+                stfifo, stfifo & ~0x0c180c18);
+
+       /* during stmwrite clear */
+       siu_stream->rw_flg = 0;
+
+       return 0;
+}
+
+static int siu_pcm_stmwrite_start(struct siu_port *port_info)
+{
+       struct siu_stream *siu_stream = &port_info->playback;
+
+       if (siu_stream->rw_flg)
+               return -EPERM;
+
+       /* Current period in buffer */
+       port_info->playback.cur_period = 0;
+
+       /* during stmwrite flag set */
+       siu_stream->rw_flg = RWF_STM_WT;
+
+       /* DMA transfer start */
+       tasklet_schedule(&siu_stream->tasklet);
+
+       return 0;
+}
+
+static void siu_dma_tx_complete(void *arg)
+{
+       struct siu_stream *siu_stream = arg;
+
+       if (!siu_stream->rw_flg)
+               return;
+
+       /* Update completed period count */
+       if (++siu_stream->cur_period >=
+           GET_MAX_PERIODS(siu_stream->buf_bytes,
+                           siu_stream->period_bytes))
+               siu_stream->cur_period = 0;
+
+       pr_debug("%s: done period #%d (%u/%u bytes), cookie %d\n",
+               __func__, siu_stream->cur_period,
+               siu_stream->cur_period * siu_stream->period_bytes,
+               siu_stream->buf_bytes, siu_stream->cookie);
+
+       tasklet_schedule(&siu_stream->tasklet);
+
+       /* Notify alsa: a period is done */
+       snd_pcm_period_elapsed(siu_stream->substream);
+}
+
+static int siu_pcm_wr_set(struct siu_port *port_info,
+                         dma_addr_t buff, u32 size)
+{
+       struct siu_info *info = siu_i2s_dai.private_data;
+       u32 __iomem *base = info->reg;
+       struct siu_stream *siu_stream = &port_info->playback;
+       struct snd_pcm_substream *substream = siu_stream->substream;
+       struct device *dev = substream->pcm->card->dev;
+       struct dma_async_tx_descriptor *desc;
+       dma_cookie_t cookie;
+       struct scatterlist sg;
+       u32 stfifo;
+
+       sg_init_table(&sg, 1);
+       sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)),
+                   size, offset_in_page(buff));
+       sg_dma_address(&sg) = buff;
+
+       desc = siu_stream->chan->device->device_prep_slave_sg(siu_stream->chan,
+               &sg, 1, DMA_TO_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+       if (!desc) {
+               dev_err(dev, "Failed to allocate a dma descriptor\n");
+               return -ENOMEM;
+       }
+
+       desc->callback = siu_dma_tx_complete;
+       desc->callback_param = siu_stream;
+       cookie = desc->tx_submit(desc);
+       if (cookie < 0) {
+               dev_err(dev, "Failed to submit a dma transfer\n");
+               return cookie;
+       }
+
+       siu_stream->tx_desc = desc;
+       siu_stream->cookie = cookie;
+
+       dma_async_issue_pending(siu_stream->chan);
+
+       /* only output FIFO enable */
+       stfifo = siu_read32(base + SIU_STFIFO);
+       siu_write32(base + SIU_STFIFO, stfifo | (port_info->stfifo & 0x0c180c18));
+       dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
+               stfifo, stfifo | (port_info->stfifo & 0x0c180c18));
+
+       return 0;
+}
+
+static int siu_pcm_rd_set(struct siu_port *port_info,
+                         dma_addr_t buff, size_t size)
+{
+       struct siu_info *info = siu_i2s_dai.private_data;
+       u32 __iomem *base = info->reg;
+       struct siu_stream *siu_stream = &port_info->capture;
+       struct snd_pcm_substream *substream = siu_stream->substream;
+       struct device *dev = substream->pcm->card->dev;
+       struct dma_async_tx_descriptor *desc;
+       dma_cookie_t cookie;
+       struct scatterlist sg;
+       u32 stfifo;
+
+       dev_dbg(dev, "%s: %u@%llx\n", __func__, size, (unsigned long long)buff);
+
+       sg_init_table(&sg, 1);
+       sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)),
+                   size, offset_in_page(buff));
+       sg_dma_address(&sg) = buff;
+
+       desc = siu_stream->chan->device->device_prep_slave_sg(siu_stream->chan,
+               &sg, 1, DMA_FROM_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+       if (!desc) {
+               dev_err(dev, "Failed to allocate dma descriptor\n");
+               return -ENOMEM;
+       }
+
+       desc->callback = siu_dma_tx_complete;
+       desc->callback_param = siu_stream;
+       cookie = desc->tx_submit(desc);
+       if (cookie < 0) {
+               dev_err(dev, "Failed to submit dma descriptor\n");
+               return cookie;
+       }
+
+       siu_stream->tx_desc = desc;
+       siu_stream->cookie = cookie;
+
+       dma_async_issue_pending(siu_stream->chan);
+
+       /* only input FIFO enable */
+       stfifo = siu_read32(base + SIU_STFIFO);
+       siu_write32(base + SIU_STFIFO, siu_read32(base + SIU_STFIFO) |
+                   (port_info->stfifo & 0x13071307));
+       dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
+               stfifo, stfifo | (port_info->stfifo & 0x13071307));
+
+       return 0;
+}
+
+static void siu_io_tasklet(unsigned long data)
+{
+       struct siu_stream *siu_stream = (struct siu_stream *)data;
+       struct snd_pcm_substream *substream = siu_stream->substream;
+       struct device *dev = substream->pcm->card->dev;
+       struct snd_pcm_runtime *rt = substream->runtime;
+       struct siu_port *port_info = siu_port_info(substream);
+
+       dev_dbg(dev, "%s: flags %x\n", __func__, siu_stream->rw_flg);
+
+       if (!siu_stream->rw_flg) {
+               dev_dbg(dev, "%s: stream inactive\n", __func__);
+               return;
+       }
+
+       if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
+               dma_addr_t buff;
+               size_t count;
+               u8 *virt;
+
+               buff = (dma_addr_t)PERIOD_OFFSET(rt->dma_addr,
+                                               siu_stream->cur_period,
+                                               siu_stream->period_bytes);
+               virt = PERIOD_OFFSET(rt->dma_area,
+                                    siu_stream->cur_period,
+                                    siu_stream->period_bytes);
+               count = siu_stream->period_bytes;
+
+               /* DMA transfer start */
+               siu_pcm_rd_set(port_info, buff, count);
+       } else {
+               siu_pcm_wr_set(port_info,
+                              (dma_addr_t)PERIOD_OFFSET(rt->dma_addr,
+                                               siu_stream->cur_period,
+                                               siu_stream->period_bytes),
+                              siu_stream->period_bytes);
+       }
+}
+
+/* Capture */
+static int siu_pcm_stmread_start(struct siu_port *port_info)
+{
+       struct siu_stream *siu_stream = &port_info->capture;
+
+       if (siu_stream->xfer_cnt > 0x1000000)
+               return -EINVAL;
+       if (siu_stream->rw_flg)
+               return -EPERM;
+
+       /* Current period in buffer */
+       siu_stream->cur_period = 0;
+
+       /* during stmread flag set */
+       siu_stream->rw_flg = RWF_STM_RD;
+
+       tasklet_schedule(&siu_stream->tasklet);
+
+       return 0;
+}
+
+static int siu_pcm_stmread_stop(struct siu_port *port_info)
+{
+       struct siu_info *info = siu_i2s_dai.private_data;
+       u32 __iomem *base = info->reg;
+       struct siu_stream *siu_stream = &port_info->capture;
+       struct device *dev = siu_stream->substream->pcm->card->dev;
+       u32 stfifo;
+
+       if (!siu_stream->rw_flg)
+               return -EPERM;
+
+       /* input FIFO disable */
+       stfifo = siu_read32(base + SIU_STFIFO);
+       siu_write32(base + SIU_STFIFO, stfifo & ~0x13071307);
+       dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
+               stfifo, stfifo & ~0x13071307);
+
+       /* during stmread flag clear */
+       siu_stream->rw_flg = 0;
+
+       return 0;
+}
+
+static int siu_pcm_hw_params(struct snd_pcm_substream *ss,
+                            struct snd_pcm_hw_params *hw_params)
+{
+       struct siu_info *info = siu_i2s_dai.private_data;
+       struct device *dev = ss->pcm->card->dev;
+       int ret;
+
+       dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
+
+       ret = snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw_params));
+       if (ret < 0)
+               dev_err(dev, "snd_pcm_lib_malloc_pages() failed\n");
+
+       return ret;
+}
+
+static int siu_pcm_hw_free(struct snd_pcm_substream *ss)
+{
+       struct siu_info *info = siu_i2s_dai.private_data;
+       struct siu_port *port_info = siu_port_info(ss);
+       struct device *dev = ss->pcm->card->dev;
+       struct siu_stream *siu_stream;
+
+       if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
+               siu_stream = &port_info->playback;
+       else
+               siu_stream = &port_info->capture;
+
+       dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
+
+       return snd_pcm_lib_free_pages(ss);
+}
+
+static bool filter(struct dma_chan *chan, void *slave)
+{
+       struct sh_dmae_slave *param = slave;
+
+       pr_debug("%s: slave ID %d\n", __func__, param->slave_id);
+
+       if (unlikely(param->dma_dev != chan->device->dev))
+               return false;
+
+       chan->private = param;
+       return true;
+}
+
+static int siu_pcm_open(struct snd_pcm_substream *ss)
+{
+       /* Playback / Capture */
+       struct siu_info *info = siu_i2s_dai.private_data;
+       struct siu_port *port_info = siu_port_info(ss);
+       struct siu_stream *siu_stream;
+       u32 port = info->port_id;
+       struct siu_platform *pdata = siu_i2s_dai.dev->platform_data;
+       struct device *dev = ss->pcm->card->dev;
+       dma_cap_mask_t mask;
+       struct sh_dmae_slave *param;
+
+       dma_cap_zero(mask);
+       dma_cap_set(DMA_SLAVE, mask);
+
+       dev_dbg(dev, "%s, port=%d@%p\n", __func__, port, port_info);
+
+       if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+               siu_stream = &port_info->playback;
+               param = &siu_stream->param;
+               param->slave_id = port ? SHDMA_SLAVE_SIUB_TX :
+                       SHDMA_SLAVE_SIUA_TX;
+       } else {
+               siu_stream = &port_info->capture;
+               param = &siu_stream->param;
+               param->slave_id = port ? SHDMA_SLAVE_SIUB_RX :
+                       SHDMA_SLAVE_SIUA_RX;
+       }
+
+       param->dma_dev = pdata->dma_dev;
+       /* Get DMA channel */
+       siu_stream->chan = dma_request_channel(mask, filter, param);
+       if (!siu_stream->chan) {
+               dev_err(dev, "DMA channel allocation failed!\n");
+               return -EBUSY;
+       }
+
+       siu_stream->substream = ss;
+
+       return 0;
+}
+
+static int siu_pcm_close(struct snd_pcm_substream *ss)
+{
+       struct siu_info *info = siu_i2s_dai.private_data;
+       struct device *dev = ss->pcm->card->dev;
+       struct siu_port *port_info = siu_port_info(ss);
+       struct siu_stream *siu_stream;
+
+       dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
+
+       if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
+               siu_stream = &port_info->playback;
+       else
+               siu_stream = &port_info->capture;
+
+       dma_release_channel(siu_stream->chan);
+       siu_stream->chan = NULL;
+
+       siu_stream->substream = NULL;
+
+       return 0;
+}
+
+static int siu_pcm_prepare(struct snd_pcm_substream *ss)
+{
+       struct siu_info *info = siu_i2s_dai.private_data;
+       struct siu_port *port_info = siu_port_info(ss);
+       struct device *dev = ss->pcm->card->dev;
+       struct snd_pcm_runtime  *rt = ss->runtime;
+       struct siu_stream *siu_stream;
+       snd_pcm_sframes_t xfer_cnt;
+
+       if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
+               siu_stream = &port_info->playback;
+       else
+               siu_stream = &port_info->capture;
+
+       rt = siu_stream->substream->runtime;
+
+       siu_stream->buf_bytes = snd_pcm_lib_buffer_bytes(ss);
+       siu_stream->period_bytes = snd_pcm_lib_period_bytes(ss);
+
+       dev_dbg(dev, "%s: port=%d, %d channels, period=%u bytes\n", __func__,
+               info->port_id, rt->channels, siu_stream->period_bytes);
+
+       /* We only support buffers that are multiples of the period */
+       if (siu_stream->buf_bytes % siu_stream->period_bytes) {
+               dev_err(dev, "%s() - buffer=%d not multiple of period=%d\n",
+                      __func__, siu_stream->buf_bytes,
+                      siu_stream->period_bytes);
+               return -EINVAL;
+       }
+
+       xfer_cnt = bytes_to_frames(rt, siu_stream->period_bytes);
+       if (!xfer_cnt || xfer_cnt > 0x1000000)
+               return -EINVAL;
+
+       siu_stream->format = rt->format;
+       siu_stream->xfer_cnt = xfer_cnt;
+
+       dev_dbg(dev, "port=%d buf=%lx buf_bytes=%d period_bytes=%d "
+               "format=%d channels=%d xfer_cnt=%d\n", info->port_id,
+               (unsigned long)rt->dma_addr, siu_stream->buf_bytes,
+               siu_stream->period_bytes,
+               siu_stream->format, rt->channels, (int)xfer_cnt);
+
+       return 0;
+}
+
+static int siu_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
+{
+       struct siu_info *info = siu_i2s_dai.private_data;
+       struct device *dev = ss->pcm->card->dev;
+       struct siu_port *port_info = siu_port_info(ss);
+       int ret;
+
+       dev_dbg(dev, "%s: port=%d@%p, cmd=%d\n", __func__,
+               info->port_id, port_info, cmd);
+
+       switch (cmd) {
+       case SNDRV_PCM_TRIGGER_START:
+               if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
+                       ret = siu_pcm_stmwrite_start(port_info);
+               else
+                       ret = siu_pcm_stmread_start(port_info);
+
+               if (ret < 0)
+                       dev_warn(dev, "%s: start failed on port=%d\n",
+                                __func__, info->port_id);
+
+               break;
+       case SNDRV_PCM_TRIGGER_STOP:
+               if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
+                       siu_pcm_stmwrite_stop(port_info);
+               else
+                       siu_pcm_stmread_stop(port_info);
+               ret = 0;
+
+               break;
+       default:
+               dev_err(dev, "%s() unsupported cmd=%d\n", __func__, cmd);
+               ret = -EINVAL;
+       }
+
+       return ret;
+}
+
+/*
+ * So far only resolution of one period is supported, subject to extending the
+ * dmangine API
+ */
+static snd_pcm_uframes_t siu_pcm_pointer_dma(struct snd_pcm_substream *ss)
+{
+       struct device *dev = ss->pcm->card->dev;
+       struct siu_info *info = siu_i2s_dai.private_data;
+       u32 __iomem *base = info->reg;
+       struct siu_port *port_info = siu_port_info(ss);
+       struct snd_pcm_runtime *rt = ss->runtime;
+       size_t ptr;
+       struct siu_stream *siu_stream;
+
+       if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
+               siu_stream = &port_info->playback;
+       else
+               siu_stream = &port_info->capture;
+
+       /*
+        * ptr is the offset into the buffer where the dma is currently at. We
+        * check if the dma buffer has just wrapped.
+        */
+       ptr = PERIOD_OFFSET(rt->dma_addr,
+                           siu_stream->cur_period,
+                           siu_stream->period_bytes) - rt->dma_addr;
+
+       dev_dbg(dev,
+               "%s: port=%d, events %x, FSTS %x, xferred %u/%u, cookie %d\n",
+               __func__, info->port_id, siu_read32(base + SIU_EVNTC),
+               siu_read32(base + SIU_SBFSTS), ptr, siu_stream->buf_bytes,
+               siu_stream->cookie);
+
+       if (ptr >= siu_stream->buf_bytes)
+               ptr = 0;
+
+       return bytes_to_frames(ss->runtime, ptr);
+}
+
+static int siu_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
+                      struct snd_pcm *pcm)
+{
+       /* card->dev == socdev->dev, see snd_soc_new_pcms() */
+       struct siu_info *info = siu_i2s_dai.private_data;
+       struct platform_device *pdev = to_platform_device(card->dev);
+       int ret;
+       int i;
+
+       /* pdev->id selects between SIUA and SIUB */
+       if (pdev->id < 0 || pdev->id >= SIU_PORT_NUM)
+               return -EINVAL;
+
+       info->port_id = pdev->id;
+
+       /*
+        * While the siu has 2 ports, only one port can be on at a time (only 1
+        * SPB). So far all the boards using the siu had only one of the ports
+        * wired to a codec. To simplify things, we only register one port with
+        * alsa. In case both ports are needed, it should be changed here
+        */
+       for (i = pdev->id; i < pdev->id + 1; i++) {
+               struct siu_port **port_info = &siu_ports[i];
+
+               ret = siu_init_port(i, port_info, card);
+               if (ret < 0)
+                       return ret;
+
+               ret = snd_pcm_lib_preallocate_pages_for_all(pcm,
+                               SNDRV_DMA_TYPE_DEV, NULL,
+                               SIU_BUFFER_BYTES_MAX, SIU_BUFFER_BYTES_MAX);
+               if (ret < 0) {
+                       dev_err(card->dev,
+                              "snd_pcm_lib_preallocate_pages_for_all() err=%d",
+                               ret);
+                       goto fail;
+               }
+
+               (*port_info)->pcm = pcm;
+
+               /* IO tasklets */
+               tasklet_init(&(*port_info)->playback.tasklet, siu_io_tasklet,
+                            (unsigned long)&(*port_info)->playback);
+               tasklet_init(&(*port_info)->capture.tasklet, siu_io_tasklet,
+                            (unsigned long)&(*port_info)->capture);
+       }
+
+       dev_info(card->dev, "SuperH SIU driver initialized.\n");
+       return 0;
+
+fail:
+       siu_free_port(siu_ports[pdev->id]);
+       dev_err(card->dev, "SIU: failed to initialize.\n");
+       return ret;
+}
+
+static void siu_pcm_free(struct snd_pcm *pcm)
+{
+       struct platform_device *pdev = to_platform_device(pcm->card->dev);
+       struct siu_port *port_info = siu_ports[pdev->id];
+
+       tasklet_kill(&port_info->capture.tasklet);
+       tasklet_kill(&port_info->playback.tasklet);
+
+       siu_free_port(port_info);
+       snd_pcm_lib_preallocate_free_for_all(pcm);
+
+       dev_dbg(pcm->card->dev, "%s\n", __func__);
+}
+
+static struct snd_pcm_ops siu_pcm_ops = {
+       .open           = siu_pcm_open,
+       .close          = siu_pcm_close,
+       .ioctl          = snd_pcm_lib_ioctl,
+       .hw_params      = siu_pcm_hw_params,
+       .hw_free        = siu_pcm_hw_free,
+       .prepare        = siu_pcm_prepare,
+       .trigger        = siu_pcm_trigger,
+       .pointer        = siu_pcm_pointer_dma,
+};
+
+struct snd_soc_platform siu_platform = {
+       .name           = "siu-audio",
+       .pcm_ops        = &siu_pcm_ops,
+       .pcm_new        = siu_pcm_new,
+       .pcm_free       = siu_pcm_free,
+};
+EXPORT_SYMBOL_GPL(siu_platform);