rapidio/tsi721: add DMA engine support
authorAlexandre Bounine <alexandre.bounine@idt.com>
Thu, 31 May 2012 23:26:39 +0000 (16:26 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 1 Jun 2012 00:49:31 +0000 (17:49 -0700)
Adds support for DMA Engine API into Tsi721 mport driver.

Includes following changes for Tsi721 driver:
- Modifies BDMA register offset definitions to support per-channel handling
- Separates BDMA channel reserved for RIO Maintenance requests
- Adds DMA Engine callback routines

Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Li Yang <leoli@freescale.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/rapidio/devices/Makefile
drivers/rapidio/devices/tsi721.c
drivers/rapidio/devices/tsi721.h
drivers/rapidio/devices/tsi721_dma.c [new file with mode: 0644]

index 3b7b4e2dff7c8a07dd159c85037302c16678b8bd..7b62860f34f805842ab9fbe28ea35a6909f029b3 100644 (file)
@@ -3,3 +3,6 @@
 #
 
 obj-$(CONFIG_RAPIDIO_TSI721)   += tsi721.o
+ifeq ($(CONFIG_RAPIDIO_DMA_ENGINE),y)
+obj-$(CONFIG_RAPIDIO_TSI721)   += tsi721_dma.o
+endif
index 30d2072f480b72947c74401d5522fbb9d697d313..722246cf20ab2ed592a6a5ed5435b0f1320a5a44 100644 (file)
@@ -108,6 +108,7 @@ static int tsi721_maint_dma(struct tsi721_device *priv, u32 sys_size,
                        u16 destid, u8 hopcount, u32 offset, int len,
                        u32 *data, int do_wr)
 {
+       void __iomem *regs = priv->regs + TSI721_DMAC_BASE(priv->mdma.ch_id);
        struct tsi721_dma_desc *bd_ptr;
        u32 rd_count, swr_ptr, ch_stat;
        int i, err = 0;
@@ -116,10 +117,9 @@ static int tsi721_maint_dma(struct tsi721_device *priv, u32 sys_size,
        if (offset > (RIO_MAINT_SPACE_SZ - len) || (len != sizeof(u32)))
                return -EINVAL;
 
-       bd_ptr = priv->bdma[TSI721_DMACH_MAINT].bd_base;
+       bd_ptr = priv->mdma.bd_base;
 
-       rd_count = ioread32(
-                       priv->regs + TSI721_DMAC_DRDCNT(TSI721_DMACH_MAINT));
+       rd_count = ioread32(regs + TSI721_DMAC_DRDCNT);
 
        /* Initialize DMA descriptor */
        bd_ptr[0].type_id = cpu_to_le32((DTYPE2 << 29) | (op << 19) | destid);
@@ -134,19 +134,18 @@ static int tsi721_maint_dma(struct tsi721_device *priv, u32 sys_size,
        mb();
 
        /* Start DMA operation */
-       iowrite32(rd_count + 2,
-               priv->regs + TSI721_DMAC_DWRCNT(TSI721_DMACH_MAINT));
-       ioread32(priv->regs + TSI721_DMAC_DWRCNT(TSI721_DMACH_MAINT));
+       iowrite32(rd_count + 2, regs + TSI721_DMAC_DWRCNT);
+       ioread32(regs + TSI721_DMAC_DWRCNT);
        i = 0;
 
        /* Wait until DMA transfer is finished */
-       while ((ch_stat = ioread32(priv->regs +
-               TSI721_DMAC_STS(TSI721_DMACH_MAINT))) & TSI721_DMAC_STS_RUN) {
+       while ((ch_stat = ioread32(regs + TSI721_DMAC_STS))
+                                                       & TSI721_DMAC_STS_RUN) {
                udelay(1);
                if (++i >= 5000000) {
                        dev_dbg(&priv->pdev->dev,
                                "%s : DMA[%d] read timeout ch_status=%x\n",
-                               __func__, TSI721_DMACH_MAINT, ch_stat);
+                               __func__, priv->mdma.ch_id, ch_stat);
                        if (!do_wr)
                                *data = 0xffffffff;
                        err = -EIO;
@@ -162,13 +161,10 @@ static int tsi721_maint_dma(struct tsi721_device *priv, u32 sys_size,
                        __func__, ch_stat);
                dev_dbg(&priv->pdev->dev, "OP=%d : destid=%x hc=%x off=%x\n",
                        do_wr ? MAINT_WR : MAINT_RD, destid, hopcount, offset);
-               iowrite32(TSI721_DMAC_INT_ALL,
-                       priv->regs + TSI721_DMAC_INT(TSI721_DMACH_MAINT));
-               iowrite32(TSI721_DMAC_CTL_INIT,
-                       priv->regs + TSI721_DMAC_CTL(TSI721_DMACH_MAINT));
+               iowrite32(TSI721_DMAC_INT_ALL, regs + TSI721_DMAC_INT);
+               iowrite32(TSI721_DMAC_CTL_INIT, regs + TSI721_DMAC_CTL);
                udelay(10);
-               iowrite32(0, priv->regs +
-                               TSI721_DMAC_DWRCNT(TSI721_DMACH_MAINT));
+               iowrite32(0, regs + TSI721_DMAC_DWRCNT);
                udelay(1);
                if (!do_wr)
                        *data = 0xffffffff;
@@ -184,8 +180,8 @@ static int tsi721_maint_dma(struct tsi721_device *priv, u32 sys_size,
         * NOTE: Skipping check and clear FIFO entries because we are waiting
         * for transfer to be completed.
         */
-       swr_ptr = ioread32(priv->regs + TSI721_DMAC_DSWP(TSI721_DMACH_MAINT));
-       iowrite32(swr_ptr, priv->regs + TSI721_DMAC_DSRP(TSI721_DMACH_MAINT));
+       swr_ptr = ioread32(regs + TSI721_DMAC_DSWP);
+       iowrite32(swr_ptr, regs + TSI721_DMAC_DSRP);
 err_out:
 
        return err;
@@ -541,6 +537,22 @@ static irqreturn_t tsi721_irqhandler(int irq, void *ptr)
                        tsi721_pw_handler(mport);
        }
 
+#ifdef CONFIG_RAPIDIO_DMA_ENGINE
+       if (dev_int & TSI721_DEV_INT_BDMA_CH) {
+               int ch;
+
+               if (dev_ch_int & TSI721_INT_BDMA_CHAN_M) {
+                       dev_dbg(&priv->pdev->dev,
+                               "IRQ from DMA channel 0x%08x\n", dev_ch_int);
+
+                       for (ch = 0; ch < TSI721_DMA_MAXCH; ch++) {
+                               if (!(dev_ch_int & TSI721_INT_BDMA_CHAN(ch)))
+                                       continue;
+                               tsi721_bdma_handler(&priv->bdma[ch]);
+                       }
+               }
+       }
+#endif
        return IRQ_HANDLED;
 }
 
@@ -553,18 +565,26 @@ static void tsi721_interrupts_init(struct tsi721_device *priv)
                priv->regs + TSI721_SR_CHINT(IDB_QUEUE));
        iowrite32(TSI721_SR_CHINT_IDBQRCV,
                priv->regs + TSI721_SR_CHINTE(IDB_QUEUE));
-       iowrite32(TSI721_INT_SR2PC_CHAN(IDB_QUEUE),
-               priv->regs + TSI721_DEV_CHAN_INTE);
 
        /* Enable SRIO MAC interrupts */
        iowrite32(TSI721_RIO_EM_DEV_INT_EN_INT,
                priv->regs + TSI721_RIO_EM_DEV_INT_EN);
 
+       /* Enable interrupts from channels in use */
+#ifdef CONFIG_RAPIDIO_DMA_ENGINE
+       intr = TSI721_INT_SR2PC_CHAN(IDB_QUEUE) |
+               (TSI721_INT_BDMA_CHAN_M &
+                ~TSI721_INT_BDMA_CHAN(TSI721_DMACH_MAINT));
+#else
+       intr = TSI721_INT_SR2PC_CHAN(IDB_QUEUE);
+#endif
+       iowrite32(intr, priv->regs + TSI721_DEV_CHAN_INTE);
+
        if (priv->flags & TSI721_USING_MSIX)
                intr = TSI721_DEV_INT_SRIO;
        else
                intr = TSI721_DEV_INT_SR2PC_CH | TSI721_DEV_INT_SRIO |
-                       TSI721_DEV_INT_SMSG_CH;
+                       TSI721_DEV_INT_SMSG_CH | TSI721_DEV_INT_BDMA_CH;
 
        iowrite32(intr, priv->regs + TSI721_DEV_INTE);
        ioread32(priv->regs + TSI721_DEV_INTE);
@@ -715,12 +735,29 @@ static int tsi721_enable_msix(struct tsi721_device *priv)
                                        TSI721_MSIX_OMSG_INT(i);
        }
 
+#ifdef CONFIG_RAPIDIO_DMA_ENGINE
+       /*
+        * Initialize MSI-X entries for Block DMA Engine:
+        * this driver supports XXX DMA channels
+        * (one is reserved for SRIO maintenance transactions)
+        */
+       for (i = 0; i < TSI721_DMA_CHNUM; i++) {
+               entries[TSI721_VECT_DMA0_DONE + i].entry =
+                                       TSI721_MSIX_DMACH_DONE(i);
+               entries[TSI721_VECT_DMA0_INT + i].entry =
+                                       TSI721_MSIX_DMACH_INT(i);
+       }
+#endif /* CONFIG_RAPIDIO_DMA_ENGINE */
+
        err = pci_enable_msix(priv->pdev, entries, ARRAY_SIZE(entries));
        if (err) {
                if (err > 0)
                        dev_info(&priv->pdev->dev,
                                 "Only %d MSI-X vectors available, "
                                 "not using MSI-X\n", err);
+               else
+                       dev_err(&priv->pdev->dev,
+                               "Failed to enable MSI-X (err=%d)\n", err);
                return err;
        }
 
@@ -760,6 +797,22 @@ static int tsi721_enable_msix(struct tsi721_device *priv)
                         i, pci_name(priv->pdev));
        }
 
+#ifdef CONFIG_RAPIDIO_DMA_ENGINE
+       for (i = 0; i < TSI721_DMA_CHNUM; i++) {
+               priv->msix[TSI721_VECT_DMA0_DONE + i].vector =
+                               entries[TSI721_VECT_DMA0_DONE + i].vector;
+               snprintf(priv->msix[TSI721_VECT_DMA0_DONE + i].irq_name,
+                        IRQ_DEVICE_NAME_MAX, DRV_NAME "-dmad%d@pci:%s",
+                        i, pci_name(priv->pdev));
+
+               priv->msix[TSI721_VECT_DMA0_INT + i].vector =
+                               entries[TSI721_VECT_DMA0_INT + i].vector;
+               snprintf(priv->msix[TSI721_VECT_DMA0_INT + i].irq_name,
+                        IRQ_DEVICE_NAME_MAX, DRV_NAME "-dmai%d@pci:%s",
+                        i, pci_name(priv->pdev));
+       }
+#endif /* CONFIG_RAPIDIO_DMA_ENGINE */
+
        return 0;
 }
 #endif /* CONFIG_PCI_MSI */
@@ -888,20 +941,34 @@ static void tsi721_doorbell_free(struct tsi721_device *priv)
        priv->idb_base = NULL;
 }
 
-static int tsi721_bdma_ch_init(struct tsi721_device *priv, int chnum)
+/**
+ * tsi721_bdma_maint_init - Initialize maintenance request BDMA channel.
+ * @priv: pointer to tsi721 private data
+ *
+ * Initialize BDMA channel allocated for RapidIO maintenance read/write
+ * request generation
+ * Returns %0 on success or %-ENOMEM on failure.
+ */
+static int tsi721_bdma_maint_init(struct tsi721_device *priv)
 {
        struct tsi721_dma_desc *bd_ptr;
        u64             *sts_ptr;
        dma_addr_t      bd_phys, sts_phys;
        int             sts_size;
-       int             bd_num = priv->bdma[chnum].bd_num;
+       int             bd_num = 2;
+       void __iomem    *regs;
 
-       dev_dbg(&priv->pdev->dev, "Init Block DMA Engine, CH%d\n", chnum);
+       dev_dbg(&priv->pdev->dev,
+               "Init Block DMA Engine for Maintenance requests, CH%d\n",
+               TSI721_DMACH_MAINT);
 
        /*
         * Initialize DMA channel for maintenance requests
         */
 
+       priv->mdma.ch_id = TSI721_DMACH_MAINT;
+       regs = priv->regs + TSI721_DMAC_BASE(TSI721_DMACH_MAINT);
+
        /* Allocate space for DMA descriptors */
        bd_ptr = dma_zalloc_coherent(&priv->pdev->dev,
                                        bd_num * sizeof(struct tsi721_dma_desc),
@@ -909,8 +976,9 @@ static int tsi721_bdma_ch_init(struct tsi721_device *priv, int chnum)
        if (!bd_ptr)
                return -ENOMEM;
 
-       priv->bdma[chnum].bd_phys = bd_phys;
-       priv->bdma[chnum].bd_base = bd_ptr;
+       priv->mdma.bd_num = bd_num;
+       priv->mdma.bd_phys = bd_phys;
+       priv->mdma.bd_base = bd_ptr;
 
        dev_dbg(&priv->pdev->dev, "DMA descriptors @ %p (phys = %llx)\n",
                bd_ptr, (unsigned long long)bd_phys);
@@ -927,13 +995,13 @@ static int tsi721_bdma_ch_init(struct tsi721_device *priv, int chnum)
                dma_free_coherent(&priv->pdev->dev,
                                  bd_num * sizeof(struct tsi721_dma_desc),
                                  bd_ptr, bd_phys);
-               priv->bdma[chnum].bd_base = NULL;
+               priv->mdma.bd_base = NULL;
                return -ENOMEM;
        }
 
-       priv->bdma[chnum].sts_phys = sts_phys;
-       priv->bdma[chnum].sts_base = sts_ptr;
-       priv->bdma[chnum].sts_size = sts_size;
+       priv->mdma.sts_phys = sts_phys;
+       priv->mdma.sts_base = sts_ptr;
+       priv->mdma.sts_size = sts_size;
 
        dev_dbg(&priv->pdev->dev,
                "desc status FIFO @ %p (phys = %llx) size=0x%x\n",
@@ -946,83 +1014,61 @@ static int tsi721_bdma_ch_init(struct tsi721_device *priv, int chnum)
        bd_ptr[bd_num - 1].next_hi = cpu_to_le32((u64)bd_phys >> 32);
 
        /* Setup DMA descriptor pointers */
-       iowrite32(((u64)bd_phys >> 32),
-               priv->regs + TSI721_DMAC_DPTRH(chnum));
+       iowrite32(((u64)bd_phys >> 32), regs + TSI721_DMAC_DPTRH);
        iowrite32(((u64)bd_phys & TSI721_DMAC_DPTRL_MASK),
-               priv->regs + TSI721_DMAC_DPTRL(chnum));
+               regs + TSI721_DMAC_DPTRL);
 
        /* Setup descriptor status FIFO */
-       iowrite32(((u64)sts_phys >> 32),
-               priv->regs + TSI721_DMAC_DSBH(chnum));
+       iowrite32(((u64)sts_phys >> 32), regs + TSI721_DMAC_DSBH);
        iowrite32(((u64)sts_phys & TSI721_DMAC_DSBL_MASK),
-               priv->regs + TSI721_DMAC_DSBL(chnum));
+               regs + TSI721_DMAC_DSBL);
        iowrite32(TSI721_DMAC_DSSZ_SIZE(sts_size),
-               priv->regs + TSI721_DMAC_DSSZ(chnum));
+               regs + TSI721_DMAC_DSSZ);
 
        /* Clear interrupt bits */
-       iowrite32(TSI721_DMAC_INT_ALL,
-               priv->regs + TSI721_DMAC_INT(chnum));
+       iowrite32(TSI721_DMAC_INT_ALL, regs + TSI721_DMAC_INT);
 
-       ioread32(priv->regs + TSI721_DMAC_INT(chnum));
+       ioread32(regs + TSI721_DMAC_INT);
 
        /* Toggle DMA channel initialization */
-       iowrite32(TSI721_DMAC_CTL_INIT, priv->regs + TSI721_DMAC_CTL(chnum));
-       ioread32(priv->regs + TSI721_DMAC_CTL(chnum));
+       iowrite32(TSI721_DMAC_CTL_INIT, regs + TSI721_DMAC_CTL);
+       ioread32(regs + TSI721_DMAC_CTL);
        udelay(10);
 
        return 0;
 }
 
-static int tsi721_bdma_ch_free(struct tsi721_device *priv, int chnum)
+static int tsi721_bdma_maint_free(struct tsi721_device *priv)
 {
        u32 ch_stat;
+       struct tsi721_bdma_maint *mdma = &priv->mdma;
+       void __iomem *regs = priv->regs + TSI721_DMAC_BASE(mdma->ch_id);
 
-       if (priv->bdma[chnum].bd_base == NULL)
+       if (mdma->bd_base == NULL)
                return 0;
 
        /* Check if DMA channel still running */
-       ch_stat = ioread32(priv->regs + TSI721_DMAC_STS(chnum));
+       ch_stat = ioread32(regs + TSI721_DMAC_STS);
        if (ch_stat & TSI721_DMAC_STS_RUN)
                return -EFAULT;
 
        /* Put DMA channel into init state */
-       iowrite32(TSI721_DMAC_CTL_INIT,
-               priv->regs + TSI721_DMAC_CTL(chnum));
+       iowrite32(TSI721_DMAC_CTL_INIT, regs + TSI721_DMAC_CTL);
 
        /* Free space allocated for DMA descriptors */
        dma_free_coherent(&priv->pdev->dev,
-               priv->bdma[chnum].bd_num * sizeof(struct tsi721_dma_desc),
-               priv->bdma[chnum].bd_base, priv->bdma[chnum].bd_phys);
-       priv->bdma[chnum].bd_base = NULL;
+               mdma->bd_num * sizeof(struct tsi721_dma_desc),
+               mdma->bd_base, mdma->bd_phys);
+       mdma->bd_base = NULL;
 
        /* Free space allocated for status FIFO */
        dma_free_coherent(&priv->pdev->dev,
-               priv->bdma[chnum].sts_size * sizeof(struct tsi721_dma_sts),
-               priv->bdma[chnum].sts_base, priv->bdma[chnum].sts_phys);
-       priv->bdma[chnum].sts_base = NULL;
-       return 0;
-}
-
-static int tsi721_bdma_init(struct tsi721_device *priv)
-{
-       /* Initialize BDMA channel allocated for RapidIO maintenance read/write
-        * request generation
-        */
-       priv->bdma[TSI721_DMACH_MAINT].bd_num = 2;
-       if (tsi721_bdma_ch_init(priv, TSI721_DMACH_MAINT)) {
-               dev_err(&priv->pdev->dev, "Unable to initialize maintenance DMA"
-                       " channel %d, aborting\n", TSI721_DMACH_MAINT);
-               return -ENOMEM;
-       }
-
+               mdma->sts_size * sizeof(struct tsi721_dma_sts),
+               mdma->sts_base, mdma->sts_phys);
+       mdma->sts_base = NULL;
        return 0;
 }
 
-static void tsi721_bdma_free(struct tsi721_device *priv)
-{
-       tsi721_bdma_ch_free(priv, TSI721_DMACH_MAINT);
-}
-
 /* Enable Inbound Messaging Interrupts */
 static void
 tsi721_imsg_interrupt_enable(struct tsi721_device *priv, int ch,
@@ -2035,7 +2081,8 @@ static void tsi721_disable_ints(struct tsi721_device *priv)
 
        /* Disable all BDMA Channel interrupts */
        for (ch = 0; ch < TSI721_DMA_MAXCH; ch++)
-               iowrite32(0, priv->regs + TSI721_DMAC_INTE(ch));
+               iowrite32(0,
+                       priv->regs + TSI721_DMAC_BASE(ch) + TSI721_DMAC_INTE);
 
        /* Disable all general BDMA interrupts */
        iowrite32(0, priv->regs + TSI721_BDMA_INTE);
@@ -2104,6 +2151,7 @@ static int __devinit tsi721_setup_mport(struct tsi721_device *priv)
        mport->phy_type = RIO_PHY_SERIAL;
        mport->priv = (void *)priv;
        mport->phys_efptr = 0x100;
+       priv->mport = mport;
 
        INIT_LIST_HEAD(&mport->dbells);
 
@@ -2129,17 +2177,21 @@ static int __devinit tsi721_setup_mport(struct tsi721_device *priv)
        if (!err) {
                tsi721_interrupts_init(priv);
                ops->pwenable = tsi721_pw_enable;
-       } else
+       } else {
                dev_err(&pdev->dev, "Unable to get assigned PCI IRQ "
                        "vector %02X err=0x%x\n", pdev->irq, err);
+               goto err_exit;
+       }
 
+#ifdef CONFIG_RAPIDIO_DMA_ENGINE
+       tsi721_register_dma(priv);
+#endif
        /* Enable SRIO link */
        iowrite32(ioread32(priv->regs + TSI721_DEVCTL) |
                  TSI721_DEVCTL_SRBOOT_CMPL,
                  priv->regs + TSI721_DEVCTL);
 
        rio_register_mport(mport);
-       priv->mport = mport;
 
        if (mport->host_deviceid >= 0)
                iowrite32(RIO_PORT_GEN_HOST | RIO_PORT_GEN_MASTER |
@@ -2149,6 +2201,11 @@ static int __devinit tsi721_setup_mport(struct tsi721_device *priv)
                iowrite32(0, priv->regs + (0x100 + RIO_PORT_GEN_CTL_CSR));
 
        return 0;
+
+err_exit:
+       kfree(mport);
+       kfree(ops);
+       return err;
 }
 
 static int __devinit tsi721_probe(struct pci_dev *pdev,
@@ -2294,7 +2351,7 @@ static int __devinit tsi721_probe(struct pci_dev *pdev,
        tsi721_init_pc2sr_mapping(priv);
        tsi721_init_sr2pc_mapping(priv);
 
-       if (tsi721_bdma_init(priv)) {
+       if (tsi721_bdma_maint_init(priv)) {
                dev_err(&pdev->dev, "BDMA initialization failed, aborting\n");
                err = -ENOMEM;
                goto err_unmap_bars;
@@ -2319,7 +2376,7 @@ static int __devinit tsi721_probe(struct pci_dev *pdev,
 err_free_consistent:
        tsi721_doorbell_free(priv);
 err_free_bdma:
-       tsi721_bdma_free(priv);
+       tsi721_bdma_maint_free(priv);
 err_unmap_bars:
        if (priv->regs)
                iounmap(priv->regs);
index 1c226b31af13fc9e196d221a4e3557f91ae9ae6c..59de9d7be3460a08250bcd197dc858bed0af6dee 100644 (file)
 #define TSI721_DEV_INTE                0x29840
 #define TSI721_DEV_INT         0x29844
 #define TSI721_DEV_INTSET      0x29848
+#define TSI721_DEV_INT_BDMA_CH 0x00002000
+#define TSI721_DEV_INT_BDMA_NCH        0x00001000
 #define TSI721_DEV_INT_SMSG_CH 0x00000800
 #define TSI721_DEV_INT_SMSG_NCH        0x00000400
 #define TSI721_DEV_INT_SR2PC_CH        0x00000200
 #define TSI721_INT_IMSG_CHAN(x)        (1 << (16 + (x)))
 #define TSI721_INT_OMSG_CHAN_M 0x0000ff00
 #define TSI721_INT_OMSG_CHAN(x)        (1 << (8 + (x)))
+#define TSI721_INT_BDMA_CHAN_M 0x000000ff
+#define TSI721_INT_BDMA_CHAN(x)        (1 << (x))
 
 /*
  * PC2SR block registers
  *   x = 0..7
  */
 
-#define TSI721_DMAC_DWRCNT(x)  (0x51000 + (x) * 0x1000)
-#define TSI721_DMAC_DRDCNT(x)  (0x51004 + (x) * 0x1000)
+#define TSI721_DMAC_BASE(x)    (0x51000 + (x) * 0x1000)
 
-#define TSI721_DMAC_CTL(x)     (0x51008 + (x) * 0x1000)
+#define TSI721_DMAC_DWRCNT     0x000
+#define TSI721_DMAC_DRDCNT     0x004
+
+#define TSI721_DMAC_CTL                0x008
 #define TSI721_DMAC_CTL_SUSP   0x00000002
 #define TSI721_DMAC_CTL_INIT   0x00000001
 
-#define TSI721_DMAC_INT(x)     (0x5100c + (x) * 0x1000)
+#define TSI721_DMAC_INT                0x00c
 #define TSI721_DMAC_INT_STFULL 0x00000010
 #define TSI721_DMAC_INT_DONE   0x00000008
 #define TSI721_DMAC_INT_SUSP   0x00000004
 #define TSI721_DMAC_INT_IOFDONE        0x00000001
 #define TSI721_DMAC_INT_ALL    0x0000001f
 
-#define TSI721_DMAC_INTSET(x)  (0x51010 + (x) * 0x1000)
+#define TSI721_DMAC_INTSET     0x010
 
-#define TSI721_DMAC_STS(x)     (0x51014 + (x) * 0x1000)
+#define TSI721_DMAC_STS                0x014
 #define TSI721_DMAC_STS_ABORT  0x00400000
 #define TSI721_DMAC_STS_RUN    0x00200000
 #define TSI721_DMAC_STS_CS     0x001f0000
 
-#define TSI721_DMAC_INTE(x)    (0x51018 + (x) * 0x1000)
+#define TSI721_DMAC_INTE       0x018
 
-#define TSI721_DMAC_DPTRL(x)   (0x51024 + (x) * 0x1000)
+#define TSI721_DMAC_DPTRL      0x024
 #define TSI721_DMAC_DPTRL_MASK 0xffffffe0
 
-#define TSI721_DMAC_DPTRH(x)   (0x51028 + (x) * 0x1000)
+#define TSI721_DMAC_DPTRH      0x028
 
-#define TSI721_DMAC_DSBL(x)    (0x5102c + (x) * 0x1000)
+#define TSI721_DMAC_DSBL       0x02c
 #define TSI721_DMAC_DSBL_MASK  0xffffffc0
 
-#define TSI721_DMAC_DSBH(x)    (0x51030 + (x) * 0x1000)
+#define TSI721_DMAC_DSBH       0x030
 
-#define TSI721_DMAC_DSSZ(x)    (0x51034 + (x) * 0x1000)
+#define TSI721_DMAC_DSSZ       0x034
 #define TSI721_DMAC_DSSZ_SIZE_M        0x0000000f
 #define TSI721_DMAC_DSSZ_SIZE(size)    (__fls(size) - 4)
 
-
-#define TSI721_DMAC_DSRP(x)    (0x51038 + (x) * 0x1000)
+#define TSI721_DMAC_DSRP       0x038
 #define TSI721_DMAC_DSRP_MASK  0x0007ffff
 
-#define TSI721_DMAC_DSWP(x)    (0x5103c + (x) * 0x1000)
+#define TSI721_DMAC_DSWP       0x03c
 #define TSI721_DMAC_DSWP_MASK  0x0007ffff
 
 #define TSI721_BDMA_INTE       0x5f000
@@ -612,6 +617,8 @@ enum dma_rtype {
 #define TSI721_DMACH_MAINT     0       /* DMA channel for maint requests */
 #define TSI721_DMACH_MAINT_NBD 32      /* Number of BDs for maint requests */
 
+#define TSI721_DMACH_DMA       1       /* DMA channel for data transfers */
+
 #define MSG_DMA_ENTRY_INX_TO_SIZE(x)   ((0x10 << (x)) & 0xFFFF0)
 
 enum tsi721_smsg_int_flag {
@@ -626,7 +633,48 @@ enum tsi721_smsg_int_flag {
 
 /* Structures */
 
+#ifdef CONFIG_RAPIDIO_DMA_ENGINE
+
+struct tsi721_tx_desc {
+       struct dma_async_tx_descriptor  txd;
+       struct tsi721_dma_desc          *hw_desc;
+       u16                             destid;
+       /* low 64-bits of 66-bit RIO address */
+       u64                             rio_addr;
+       /* upper 2-bits of 66-bit RIO address */
+       u8                              rio_addr_u;
+       bool                            interrupt;
+       struct list_head                desc_node;
+       struct list_head                tx_list;
+};
+
 struct tsi721_bdma_chan {
+       int             id;
+       void __iomem    *regs;
+       int             bd_num;         /* number of buffer descriptors */
+       void            *bd_base;       /* start of DMA descriptors */
+       dma_addr_t      bd_phys;
+       void            *sts_base;      /* start of DMA BD status FIFO */
+       dma_addr_t      sts_phys;
+       int             sts_size;
+       u32             sts_rdptr;
+       u32             wr_count;
+       u32             wr_count_next;
+
+       struct dma_chan         dchan;
+       struct tsi721_tx_desc   *tx_desc;
+       spinlock_t              lock;
+       struct list_head        active_list;
+       struct list_head        queue;
+       struct list_head        free_list;
+       dma_cookie_t            completed_cookie;
+       struct tasklet_struct   tasklet;
+};
+
+#endif /* CONFIG_RAPIDIO_DMA_ENGINE */
+
+struct tsi721_bdma_maint {
+       int             ch_id;          /* BDMA channel number */
        int             bd_num;         /* number of buffer descriptors */
        void            *bd_base;       /* start of DMA descriptors */
        dma_addr_t      bd_phys;
@@ -721,6 +769,24 @@ enum tsi721_msix_vect {
        TSI721_VECT_IMB1_INT,
        TSI721_VECT_IMB2_INT,
        TSI721_VECT_IMB3_INT,
+#ifdef CONFIG_RAPIDIO_DMA_ENGINE
+       TSI721_VECT_DMA0_DONE,
+       TSI721_VECT_DMA1_DONE,
+       TSI721_VECT_DMA2_DONE,
+       TSI721_VECT_DMA3_DONE,
+       TSI721_VECT_DMA4_DONE,
+       TSI721_VECT_DMA5_DONE,
+       TSI721_VECT_DMA6_DONE,
+       TSI721_VECT_DMA7_DONE,
+       TSI721_VECT_DMA0_INT,
+       TSI721_VECT_DMA1_INT,
+       TSI721_VECT_DMA2_INT,
+       TSI721_VECT_DMA3_INT,
+       TSI721_VECT_DMA4_INT,
+       TSI721_VECT_DMA5_INT,
+       TSI721_VECT_DMA6_INT,
+       TSI721_VECT_DMA7_INT,
+#endif /* CONFIG_RAPIDIO_DMA_ENGINE */
        TSI721_VECT_MAX
 };
 
@@ -754,7 +820,11 @@ struct tsi721_device {
        u32             pw_discard_count;
 
        /* BDMA Engine */
+       struct tsi721_bdma_maint mdma; /* Maintenance rd/wr request channel */
+
+#ifdef CONFIG_RAPIDIO_DMA_ENGINE
        struct tsi721_bdma_chan bdma[TSI721_DMA_CHNUM];
+#endif
 
        /* Inbound Messaging */
        int             imsg_init[TSI721_IMSG_CHNUM];
@@ -765,4 +835,9 @@ struct tsi721_device {
        struct tsi721_omsg_ring omsg_ring[TSI721_OMSG_CHNUM];
 };
 
+#ifdef CONFIG_RAPIDIO_DMA_ENGINE
+extern void tsi721_bdma_handler(struct tsi721_bdma_chan *bdma_chan);
+extern int __devinit tsi721_register_dma(struct tsi721_device *priv);
+#endif
+
 #endif
diff --git a/drivers/rapidio/devices/tsi721_dma.c b/drivers/rapidio/devices/tsi721_dma.c
new file mode 100644 (file)
index 0000000..92e06a5
--- /dev/null
@@ -0,0 +1,823 @@
+/*
+ * DMA Engine support for Tsi721 PCIExpress-to-SRIO bridge
+ *
+ * Copyright 2011 Integrated Device Technology, Inc.
+ * Alexandre Bounine <alexandre.bounine@idt.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., 59
+ * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#include <linux/io.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/rio.h>
+#include <linux/rio_drv.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/kfifo.h>
+#include <linux/delay.h>
+
+#include "tsi721.h"
+
+static inline struct tsi721_bdma_chan *to_tsi721_chan(struct dma_chan *chan)
+{
+       return container_of(chan, struct tsi721_bdma_chan, dchan);
+}
+
+static inline struct tsi721_device *to_tsi721(struct dma_device *ddev)
+{
+       return container_of(ddev, struct rio_mport, dma)->priv;
+}
+
+static inline
+struct tsi721_tx_desc *to_tsi721_desc(struct dma_async_tx_descriptor *txd)
+{
+       return container_of(txd, struct tsi721_tx_desc, txd);
+}
+
+static inline
+struct tsi721_tx_desc *tsi721_dma_first_active(
+                               struct tsi721_bdma_chan *bdma_chan)
+{
+       return list_first_entry(&bdma_chan->active_list,
+                               struct tsi721_tx_desc, desc_node);
+}
+
+static int tsi721_bdma_ch_init(struct tsi721_bdma_chan *bdma_chan)
+{
+       struct tsi721_dma_desc *bd_ptr;
+       struct device *dev = bdma_chan->dchan.device->dev;
+       u64             *sts_ptr;
+       dma_addr_t      bd_phys;
+       dma_addr_t      sts_phys;
+       int             sts_size;
+       int             bd_num = bdma_chan->bd_num;
+
+       dev_dbg(dev, "Init Block DMA Engine, CH%d\n", bdma_chan->id);
+
+       /* Allocate space for DMA descriptors */
+       bd_ptr = dma_zalloc_coherent(dev,
+                               bd_num * sizeof(struct tsi721_dma_desc),
+                               &bd_phys, GFP_KERNEL);
+       if (!bd_ptr)
+               return -ENOMEM;
+
+       bdma_chan->bd_phys = bd_phys;
+       bdma_chan->bd_base = bd_ptr;
+
+       dev_dbg(dev, "DMA descriptors @ %p (phys = %llx)\n",
+               bd_ptr, (unsigned long long)bd_phys);
+
+       /* Allocate space for descriptor status FIFO */
+       sts_size = (bd_num >= TSI721_DMA_MINSTSSZ) ?
+                                       bd_num : TSI721_DMA_MINSTSSZ;
+       sts_size = roundup_pow_of_two(sts_size);
+       sts_ptr = dma_zalloc_coherent(dev,
+                                    sts_size * sizeof(struct tsi721_dma_sts),
+                                    &sts_phys, GFP_KERNEL);
+       if (!sts_ptr) {
+               /* Free space allocated for DMA descriptors */
+               dma_free_coherent(dev,
+                                 bd_num * sizeof(struct tsi721_dma_desc),
+                                 bd_ptr, bd_phys);
+               bdma_chan->bd_base = NULL;
+               return -ENOMEM;
+       }
+
+       bdma_chan->sts_phys = sts_phys;
+       bdma_chan->sts_base = sts_ptr;
+       bdma_chan->sts_size = sts_size;
+
+       dev_dbg(dev,
+               "desc status FIFO @ %p (phys = %llx) size=0x%x\n",
+               sts_ptr, (unsigned long long)sts_phys, sts_size);
+
+       /* Initialize DMA descriptors ring */
+       bd_ptr[bd_num - 1].type_id = cpu_to_le32(DTYPE3 << 29);
+       bd_ptr[bd_num - 1].next_lo = cpu_to_le32((u64)bd_phys &
+                                                TSI721_DMAC_DPTRL_MASK);
+       bd_ptr[bd_num - 1].next_hi = cpu_to_le32((u64)bd_phys >> 32);
+
+       /* Setup DMA descriptor pointers */
+       iowrite32(((u64)bd_phys >> 32),
+               bdma_chan->regs + TSI721_DMAC_DPTRH);
+       iowrite32(((u64)bd_phys & TSI721_DMAC_DPTRL_MASK),
+               bdma_chan->regs + TSI721_DMAC_DPTRL);
+
+       /* Setup descriptor status FIFO */
+       iowrite32(((u64)sts_phys >> 32),
+               bdma_chan->regs + TSI721_DMAC_DSBH);
+       iowrite32(((u64)sts_phys & TSI721_DMAC_DSBL_MASK),
+               bdma_chan->regs + TSI721_DMAC_DSBL);
+       iowrite32(TSI721_DMAC_DSSZ_SIZE(sts_size),
+               bdma_chan->regs + TSI721_DMAC_DSSZ);
+
+       /* Clear interrupt bits */
+       iowrite32(TSI721_DMAC_INT_ALL,
+               bdma_chan->regs + TSI721_DMAC_INT);
+
+       ioread32(bdma_chan->regs + TSI721_DMAC_INT);
+
+       /* Toggle DMA channel initialization */
+       iowrite32(TSI721_DMAC_CTL_INIT, bdma_chan->regs + TSI721_DMAC_CTL);
+       ioread32(bdma_chan->regs + TSI721_DMAC_CTL);
+       bdma_chan->wr_count = bdma_chan->wr_count_next = 0;
+       bdma_chan->sts_rdptr = 0;
+       udelay(10);
+
+       return 0;
+}
+
+static int tsi721_bdma_ch_free(struct tsi721_bdma_chan *bdma_chan)
+{
+       u32 ch_stat;
+
+       if (bdma_chan->bd_base == NULL)
+               return 0;
+
+       /* Check if DMA channel still running */
+       ch_stat = ioread32(bdma_chan->regs + TSI721_DMAC_STS);
+       if (ch_stat & TSI721_DMAC_STS_RUN)
+               return -EFAULT;
+
+       /* Put DMA channel into init state */
+       iowrite32(TSI721_DMAC_CTL_INIT, bdma_chan->regs + TSI721_DMAC_CTL);
+
+       /* Free space allocated for DMA descriptors */
+       dma_free_coherent(bdma_chan->dchan.device->dev,
+               bdma_chan->bd_num * sizeof(struct tsi721_dma_desc),
+               bdma_chan->bd_base, bdma_chan->bd_phys);
+       bdma_chan->bd_base = NULL;
+
+       /* Free space allocated for status FIFO */
+       dma_free_coherent(bdma_chan->dchan.device->dev,
+               bdma_chan->sts_size * sizeof(struct tsi721_dma_sts),
+               bdma_chan->sts_base, bdma_chan->sts_phys);
+       bdma_chan->sts_base = NULL;
+       return 0;
+}
+
+static void
+tsi721_bdma_interrupt_enable(struct tsi721_bdma_chan *bdma_chan, int enable)
+{
+       if (enable) {
+               /* Clear pending BDMA channel interrupts */
+               iowrite32(TSI721_DMAC_INT_ALL,
+                       bdma_chan->regs + TSI721_DMAC_INT);
+               ioread32(bdma_chan->regs + TSI721_DMAC_INT);
+               /* Enable BDMA channel interrupts */
+               iowrite32(TSI721_DMAC_INT_ALL,
+                       bdma_chan->regs + TSI721_DMAC_INTE);
+       } else {
+               /* Disable BDMA channel interrupts */
+               iowrite32(0, bdma_chan->regs + TSI721_DMAC_INTE);
+               /* Clear pending BDMA channel interrupts */
+               iowrite32(TSI721_DMAC_INT_ALL,
+                       bdma_chan->regs + TSI721_DMAC_INT);
+       }
+
+}
+
+static bool tsi721_dma_is_idle(struct tsi721_bdma_chan *bdma_chan)
+{
+       u32 sts;
+
+       sts = ioread32(bdma_chan->regs + TSI721_DMAC_STS);
+       return ((sts & TSI721_DMAC_STS_RUN) == 0);
+}
+
+void tsi721_bdma_handler(struct tsi721_bdma_chan *bdma_chan)
+{
+       /* Disable BDMA channel interrupts */
+       iowrite32(0, bdma_chan->regs + TSI721_DMAC_INTE);
+
+       tasklet_schedule(&bdma_chan->tasklet);
+}
+
+#ifdef CONFIG_PCI_MSI
+/**
+ * tsi721_omsg_msix - MSI-X interrupt handler for BDMA channels
+ * @irq: Linux interrupt number
+ * @ptr: Pointer to interrupt-specific data (BDMA channel structure)
+ *
+ * Handles BDMA channel interrupts signaled using MSI-X.
+ */
+static irqreturn_t tsi721_bdma_msix(int irq, void *ptr)
+{
+       struct tsi721_bdma_chan *bdma_chan = ptr;
+
+       tsi721_bdma_handler(bdma_chan);
+       return IRQ_HANDLED;
+}
+#endif /* CONFIG_PCI_MSI */
+
+/* Must be called with the spinlock held */
+static void tsi721_start_dma(struct tsi721_bdma_chan *bdma_chan)
+{
+       if (!tsi721_dma_is_idle(bdma_chan)) {
+               dev_err(bdma_chan->dchan.device->dev,
+                       "BUG: Attempt to start non-idle channel\n");
+               return;
+       }
+
+       if (bdma_chan->wr_count == bdma_chan->wr_count_next) {
+               dev_err(bdma_chan->dchan.device->dev,
+                       "BUG: Attempt to start DMA with no BDs ready\n");
+               return;
+       }
+
+       dev_dbg(bdma_chan->dchan.device->dev,
+               "tx_chan: %p, chan: %d, regs: %p\n",
+               bdma_chan, bdma_chan->dchan.chan_id, bdma_chan->regs);
+
+       iowrite32(bdma_chan->wr_count_next,
+               bdma_chan->regs + TSI721_DMAC_DWRCNT);
+       ioread32(bdma_chan->regs + TSI721_DMAC_DWRCNT);
+
+       bdma_chan->wr_count = bdma_chan->wr_count_next;
+}
+
+static void tsi721_desc_put(struct tsi721_bdma_chan *bdma_chan,
+                           struct tsi721_tx_desc *desc)
+{
+       dev_dbg(bdma_chan->dchan.device->dev,
+               "Put desc: %p into free list\n", desc);
+
+       if (desc) {
+               spin_lock_bh(&bdma_chan->lock);
+               list_splice_init(&desc->tx_list, &bdma_chan->free_list);
+               list_add(&desc->desc_node, &bdma_chan->free_list);
+               bdma_chan->wr_count_next = bdma_chan->wr_count;
+               spin_unlock_bh(&bdma_chan->lock);
+       }
+}
+
+static
+struct tsi721_tx_desc *tsi721_desc_get(struct tsi721_bdma_chan *bdma_chan)
+{
+       struct tsi721_tx_desc *tx_desc, *_tx_desc;
+       struct tsi721_tx_desc *ret = NULL;
+       int i;
+
+       spin_lock_bh(&bdma_chan->lock);
+       list_for_each_entry_safe(tx_desc, _tx_desc,
+                                &bdma_chan->free_list, desc_node) {
+               if (async_tx_test_ack(&tx_desc->txd)) {
+                       list_del(&tx_desc->desc_node);
+                       ret = tx_desc;
+                       break;
+               }
+               dev_dbg(bdma_chan->dchan.device->dev,
+                       "desc %p not ACKed\n", tx_desc);
+       }
+
+       i = bdma_chan->wr_count_next % bdma_chan->bd_num;
+       if (i == bdma_chan->bd_num - 1) {
+               i = 0;
+               bdma_chan->wr_count_next++; /* skip link descriptor */
+       }
+
+       bdma_chan->wr_count_next++;
+       tx_desc->txd.phys = bdma_chan->bd_phys +
+                               i * sizeof(struct tsi721_dma_desc);
+       tx_desc->hw_desc = &((struct tsi721_dma_desc *)bdma_chan->bd_base)[i];
+
+       spin_unlock_bh(&bdma_chan->lock);
+
+       return ret;
+}
+
+static int
+tsi721_fill_desc(struct tsi721_bdma_chan *bdma_chan,
+       struct tsi721_tx_desc *desc, struct scatterlist *sg,
+       enum dma_rtype rtype, u32 sys_size)
+{
+       struct tsi721_dma_desc *bd_ptr = desc->hw_desc;
+       u64 rio_addr;
+
+       if (sg_dma_len(sg) > TSI721_DMAD_BCOUNT1 + 1) {
+               dev_err(bdma_chan->dchan.device->dev,
+                       "SG element is too large\n");
+               return -EINVAL;
+       }
+
+       dev_dbg(bdma_chan->dchan.device->dev,
+               "desc: 0x%llx, addr: 0x%llx len: 0x%x\n",
+               (u64)desc->txd.phys, (unsigned long long)sg_dma_address(sg),
+               sg_dma_len(sg));
+
+       dev_dbg(bdma_chan->dchan.device->dev,
+               "bd_ptr = %p did=%d raddr=0x%llx\n",
+               bd_ptr, desc->destid, desc->rio_addr);
+
+       /* Initialize DMA descriptor */
+       bd_ptr->type_id = cpu_to_le32((DTYPE1 << 29) |
+                                       (rtype << 19) | desc->destid);
+       if (desc->interrupt)
+               bd_ptr->type_id |= cpu_to_le32(TSI721_DMAD_IOF);
+       bd_ptr->bcount = cpu_to_le32(((desc->rio_addr & 0x3) << 30) |
+                                       (sys_size << 26) | sg_dma_len(sg));
+       rio_addr = (desc->rio_addr >> 2) |
+                               ((u64)(desc->rio_addr_u & 0x3) << 62);
+       bd_ptr->raddr_lo = cpu_to_le32(rio_addr & 0xffffffff);
+       bd_ptr->raddr_hi = cpu_to_le32(rio_addr >> 32);
+       bd_ptr->t1.bufptr_lo = cpu_to_le32(
+                                       (u64)sg_dma_address(sg) & 0xffffffff);
+       bd_ptr->t1.bufptr_hi = cpu_to_le32((u64)sg_dma_address(sg) >> 32);
+       bd_ptr->t1.s_dist = 0;
+       bd_ptr->t1.s_size = 0;
+
+       return 0;
+}
+
+static void tsi721_dma_chain_complete(struct tsi721_bdma_chan *bdma_chan,
+                                     struct tsi721_tx_desc *desc)
+{
+       struct dma_async_tx_descriptor *txd = &desc->txd;
+       dma_async_tx_callback callback = txd->callback;
+       void *param = txd->callback_param;
+
+       list_splice_init(&desc->tx_list, &bdma_chan->free_list);
+       list_move(&desc->desc_node, &bdma_chan->free_list);
+       bdma_chan->completed_cookie = txd->cookie;
+
+       if (callback)
+               callback(param);
+}
+
+static void tsi721_dma_complete_all(struct tsi721_bdma_chan *bdma_chan)
+{
+       struct tsi721_tx_desc *desc, *_d;
+       LIST_HEAD(list);
+
+       BUG_ON(!tsi721_dma_is_idle(bdma_chan));
+
+       if (!list_empty(&bdma_chan->queue))
+               tsi721_start_dma(bdma_chan);
+
+       list_splice_init(&bdma_chan->active_list, &list);
+       list_splice_init(&bdma_chan->queue, &bdma_chan->active_list);
+
+       list_for_each_entry_safe(desc, _d, &list, desc_node)
+               tsi721_dma_chain_complete(bdma_chan, desc);
+}
+
+static void tsi721_clr_stat(struct tsi721_bdma_chan *bdma_chan)
+{
+       u32 srd_ptr;
+       u64 *sts_ptr;
+       int i, j;
+
+       /* Check and clear descriptor status FIFO entries */
+       srd_ptr = bdma_chan->sts_rdptr;
+       sts_ptr = bdma_chan->sts_base;
+       j = srd_ptr * 8;
+       while (sts_ptr[j]) {
+               for (i = 0; i < 8 && sts_ptr[j]; i++, j++)
+                       sts_ptr[j] = 0;
+
+               ++srd_ptr;
+               srd_ptr %= bdma_chan->sts_size;
+               j = srd_ptr * 8;
+       }
+
+       iowrite32(srd_ptr, bdma_chan->regs + TSI721_DMAC_DSRP);
+       bdma_chan->sts_rdptr = srd_ptr;
+}
+
+static void tsi721_advance_work(struct tsi721_bdma_chan *bdma_chan)
+{
+       if (list_empty(&bdma_chan->active_list) ||
+               list_is_singular(&bdma_chan->active_list)) {
+               dev_dbg(bdma_chan->dchan.device->dev,
+                       "%s: Active_list empty\n", __func__);
+               tsi721_dma_complete_all(bdma_chan);
+       } else {
+               dev_dbg(bdma_chan->dchan.device->dev,
+                       "%s: Active_list NOT empty\n", __func__);
+               tsi721_dma_chain_complete(bdma_chan,
+                                       tsi721_dma_first_active(bdma_chan));
+               tsi721_start_dma(bdma_chan);
+       }
+}
+
+static void tsi721_dma_tasklet(unsigned long data)
+{
+       struct tsi721_bdma_chan *bdma_chan = (struct tsi721_bdma_chan *)data;
+       u32 dmac_int, dmac_sts;
+
+       dmac_int = ioread32(bdma_chan->regs + TSI721_DMAC_INT);
+       dev_dbg(bdma_chan->dchan.device->dev, "%s: DMAC%d_INT = 0x%x\n",
+               __func__, bdma_chan->id, dmac_int);
+       /* Clear channel interrupts */
+       iowrite32(dmac_int, bdma_chan->regs + TSI721_DMAC_INT);
+
+       if (dmac_int & TSI721_DMAC_INT_ERR) {
+               dmac_sts = ioread32(bdma_chan->regs + TSI721_DMAC_STS);
+               dev_err(bdma_chan->dchan.device->dev,
+                       "%s: DMA ERROR - DMAC%d_STS = 0x%x\n",
+                       __func__, bdma_chan->id, dmac_sts);
+       }
+
+       if (dmac_int & TSI721_DMAC_INT_STFULL) {
+               dev_err(bdma_chan->dchan.device->dev,
+                       "%s: DMAC%d descriptor status FIFO is full\n",
+                       __func__, bdma_chan->id);
+       }
+
+       if (dmac_int & (TSI721_DMAC_INT_DONE | TSI721_DMAC_INT_IOFDONE)) {
+               tsi721_clr_stat(bdma_chan);
+               spin_lock(&bdma_chan->lock);
+               tsi721_advance_work(bdma_chan);
+               spin_unlock(&bdma_chan->lock);
+       }
+
+       /* Re-Enable BDMA channel interrupts */
+       iowrite32(TSI721_DMAC_INT_ALL, bdma_chan->regs + TSI721_DMAC_INTE);
+}
+
+static dma_cookie_t tsi721_tx_submit(struct dma_async_tx_descriptor *txd)
+{
+       struct tsi721_tx_desc *desc = to_tsi721_desc(txd);
+       struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(txd->chan);
+       dma_cookie_t cookie;
+
+       spin_lock_bh(&bdma_chan->lock);
+
+       cookie = txd->chan->cookie;
+       if (++cookie < 0)
+               cookie = 1;
+       txd->chan->cookie = cookie;
+       txd->cookie = cookie;
+
+       if (list_empty(&bdma_chan->active_list)) {
+               list_add_tail(&desc->desc_node, &bdma_chan->active_list);
+               tsi721_start_dma(bdma_chan);
+       } else {
+               list_add_tail(&desc->desc_node, &bdma_chan->queue);
+       }
+
+       spin_unlock_bh(&bdma_chan->lock);
+       return cookie;
+}
+
+static int tsi721_alloc_chan_resources(struct dma_chan *dchan)
+{
+       struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(dchan);
+#ifdef CONFIG_PCI_MSI
+       struct tsi721_device *priv = to_tsi721(dchan->device);
+#endif
+       struct tsi721_tx_desc *desc = NULL;
+       LIST_HEAD(tmp_list);
+       int i;
+       int rc;
+
+       if (bdma_chan->bd_base)
+               return bdma_chan->bd_num - 1;
+
+       /* Initialize BDMA channel */
+       if (tsi721_bdma_ch_init(bdma_chan)) {
+               dev_err(dchan->device->dev, "Unable to initialize data DMA"
+                       " channel %d, aborting\n", bdma_chan->id);
+               return -ENOMEM;
+       }
+
+       /* Alocate matching number of logical descriptors */
+       desc = kcalloc((bdma_chan->bd_num - 1), sizeof(struct tsi721_tx_desc),
+                       GFP_KERNEL);
+       if (!desc) {
+               dev_err(dchan->device->dev,
+                       "Failed to allocate logical descriptors\n");
+               rc = -ENOMEM;
+               goto err_out;
+       }
+
+       bdma_chan->tx_desc = desc;
+
+       for (i = 0; i < bdma_chan->bd_num - 1; i++) {
+               dma_async_tx_descriptor_init(&desc[i].txd, dchan);
+               desc[i].txd.tx_submit = tsi721_tx_submit;
+               desc[i].txd.flags = DMA_CTRL_ACK;
+               INIT_LIST_HEAD(&desc[i].tx_list);
+               list_add_tail(&desc[i].desc_node, &tmp_list);
+       }
+
+       spin_lock_bh(&bdma_chan->lock);
+       list_splice(&tmp_list, &bdma_chan->free_list);
+       bdma_chan->completed_cookie = dchan->cookie = 1;
+       spin_unlock_bh(&bdma_chan->lock);
+
+#ifdef CONFIG_PCI_MSI
+       if (priv->flags & TSI721_USING_MSIX) {
+               /* Request interrupt service if we are in MSI-X mode */
+               rc = request_irq(
+                       priv->msix[TSI721_VECT_DMA0_DONE +
+                                  bdma_chan->id].vector,
+                       tsi721_bdma_msix, 0,
+                       priv->msix[TSI721_VECT_DMA0_DONE +
+                                  bdma_chan->id].irq_name,
+                       (void *)bdma_chan);
+
+               if (rc) {
+                       dev_dbg(dchan->device->dev,
+                               "Unable to allocate MSI-X interrupt for "
+                               "BDMA%d-DONE\n", bdma_chan->id);
+                       goto err_out;
+               }
+
+               rc = request_irq(priv->msix[TSI721_VECT_DMA0_INT +
+                                           bdma_chan->id].vector,
+                               tsi721_bdma_msix, 0,
+                               priv->msix[TSI721_VECT_DMA0_INT +
+                                          bdma_chan->id].irq_name,
+                               (void *)bdma_chan);
+
+               if (rc) {
+                       dev_dbg(dchan->device->dev,
+                               "Unable to allocate MSI-X interrupt for "
+                               "BDMA%d-INT\n", bdma_chan->id);
+                       free_irq(
+                               priv->msix[TSI721_VECT_DMA0_DONE +
+                                          bdma_chan->id].vector,
+                               (void *)bdma_chan);
+                       rc = -EIO;
+                       goto err_out;
+               }
+       }
+#endif /* CONFIG_PCI_MSI */
+
+       tasklet_enable(&bdma_chan->tasklet);
+       tsi721_bdma_interrupt_enable(bdma_chan, 1);
+
+       return bdma_chan->bd_num - 1;
+
+err_out:
+       kfree(desc);
+       tsi721_bdma_ch_free(bdma_chan);
+       return rc;
+}
+
+static void tsi721_free_chan_resources(struct dma_chan *dchan)
+{
+       struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(dchan);
+#ifdef CONFIG_PCI_MSI
+       struct tsi721_device *priv = to_tsi721(dchan->device);
+#endif
+       LIST_HEAD(list);
+
+       dev_dbg(dchan->device->dev, "%s: Entry\n", __func__);
+
+       if (bdma_chan->bd_base == NULL)
+               return;
+
+       BUG_ON(!list_empty(&bdma_chan->active_list));
+       BUG_ON(!list_empty(&bdma_chan->queue));
+
+       tasklet_disable(&bdma_chan->tasklet);
+
+       spin_lock_bh(&bdma_chan->lock);
+       list_splice_init(&bdma_chan->free_list, &list);
+       spin_unlock_bh(&bdma_chan->lock);
+
+       tsi721_bdma_interrupt_enable(bdma_chan, 0);
+
+#ifdef CONFIG_PCI_MSI
+       if (priv->flags & TSI721_USING_MSIX) {
+               free_irq(priv->msix[TSI721_VECT_DMA0_DONE +
+                                   bdma_chan->id].vector, (void *)bdma_chan);
+               free_irq(priv->msix[TSI721_VECT_DMA0_INT +
+                                   bdma_chan->id].vector, (void *)bdma_chan);
+       }
+#endif /* CONFIG_PCI_MSI */
+
+       tsi721_bdma_ch_free(bdma_chan);
+       kfree(bdma_chan->tx_desc);
+}
+
+static
+enum dma_status tsi721_tx_status(struct dma_chan *dchan, dma_cookie_t cookie,
+                                struct dma_tx_state *txstate)
+{
+       struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(dchan);
+       dma_cookie_t            last_used;
+       dma_cookie_t            last_completed;
+       int                     ret;
+
+       spin_lock_bh(&bdma_chan->lock);
+       last_completed = bdma_chan->completed_cookie;
+       last_used = dchan->cookie;
+       spin_unlock_bh(&bdma_chan->lock);
+
+       ret = dma_async_is_complete(cookie, last_completed, last_used);
+
+       dma_set_tx_state(txstate, last_completed, last_used, 0);
+
+       dev_dbg(dchan->device->dev,
+               "%s: exit, ret: %d, last_completed: %d, last_used: %d\n",
+               __func__, ret, last_completed, last_used);
+
+       return ret;
+}
+
+static void tsi721_issue_pending(struct dma_chan *dchan)
+{
+       struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(dchan);
+
+       dev_dbg(dchan->device->dev, "%s: Entry\n", __func__);
+
+       if (tsi721_dma_is_idle(bdma_chan)) {
+               spin_lock_bh(&bdma_chan->lock);
+               tsi721_advance_work(bdma_chan);
+               spin_unlock_bh(&bdma_chan->lock);
+       } else
+               dev_dbg(dchan->device->dev,
+                       "%s: DMA channel still busy\n", __func__);
+}
+
+static
+struct dma_async_tx_descriptor *tsi721_prep_rio_sg(struct dma_chan *dchan,
+                       struct scatterlist *sgl, unsigned int sg_len,
+                       enum dma_transfer_direction dir, unsigned long flags,
+                       void *tinfo)
+{
+       struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(dchan);
+       struct tsi721_tx_desc *desc = NULL;
+       struct tsi721_tx_desc *first = NULL;
+       struct scatterlist *sg;
+       struct rio_dma_ext *rext = tinfo;
+       u64 rio_addr = rext->rio_addr; /* limited to 64-bit rio_addr for now */
+       unsigned int i;
+       u32 sys_size = dma_to_mport(dchan->device)->sys_size;
+       enum dma_rtype rtype;
+
+       if (!sgl || !sg_len) {
+               dev_err(dchan->device->dev, "%s: No SG list\n", __func__);
+               return NULL;
+       }
+
+       if (dir == DMA_DEV_TO_MEM)
+               rtype = NREAD;
+       else if (dir == DMA_MEM_TO_DEV) {
+               switch (rext->wr_type) {
+               case RDW_ALL_NWRITE:
+                       rtype = ALL_NWRITE;
+                       break;
+               case RDW_ALL_NWRITE_R:
+                       rtype = ALL_NWRITE_R;
+                       break;
+               case RDW_LAST_NWRITE_R:
+               default:
+                       rtype = LAST_NWRITE_R;
+                       break;
+               }
+       } else {
+               dev_err(dchan->device->dev,
+                       "%s: Unsupported DMA direction option\n", __func__);
+               return NULL;
+       }
+
+       for_each_sg(sgl, sg, sg_len, i) {
+               int err;
+
+               dev_dbg(dchan->device->dev, "%s: sg #%d\n", __func__, i);
+               desc = tsi721_desc_get(bdma_chan);
+               if (!desc) {
+                       dev_err(dchan->device->dev,
+                               "Not enough descriptors available\n");
+                       goto err_desc_get;
+               }
+
+               if (sg_is_last(sg))
+                       desc->interrupt = (flags & DMA_PREP_INTERRUPT) != 0;
+               else
+                       desc->interrupt = false;
+
+               desc->destid = rext->destid;
+               desc->rio_addr = rio_addr;
+               desc->rio_addr_u = 0;
+
+               err = tsi721_fill_desc(bdma_chan, desc, sg, rtype, sys_size);
+               if (err) {
+                       dev_err(dchan->device->dev,
+                               "Failed to build desc: %d\n", err);
+                       goto err_desc_get;
+               }
+
+               rio_addr += sg_dma_len(sg);
+
+               if (!first)
+                       first = desc;
+               else
+                       list_add_tail(&desc->desc_node, &first->tx_list);
+       }
+
+       first->txd.cookie = -EBUSY;
+       desc->txd.flags = flags;
+
+       return &first->txd;
+
+err_desc_get:
+       tsi721_desc_put(bdma_chan, first);
+       return NULL;
+}
+
+static int tsi721_device_control(struct dma_chan *dchan, enum dma_ctrl_cmd cmd,
+                            unsigned long arg)
+{
+       struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(dchan);
+       struct tsi721_tx_desc *desc, *_d;
+       LIST_HEAD(list);
+
+       dev_dbg(dchan->device->dev, "%s: Entry\n", __func__);
+
+       if (cmd != DMA_TERMINATE_ALL)
+               return -ENXIO;
+
+       spin_lock_bh(&bdma_chan->lock);
+
+       /* make sure to stop the transfer */
+       iowrite32(TSI721_DMAC_CTL_SUSP, bdma_chan->regs + TSI721_DMAC_CTL);
+
+       list_splice_init(&bdma_chan->active_list, &list);
+       list_splice_init(&bdma_chan->queue, &list);
+
+       list_for_each_entry_safe(desc, _d, &list, desc_node)
+               tsi721_dma_chain_complete(bdma_chan, desc);
+
+       spin_unlock_bh(&bdma_chan->lock);
+
+       return 0;
+}
+
+int __devinit tsi721_register_dma(struct tsi721_device *priv)
+{
+       int i;
+       int nr_channels = TSI721_DMA_MAXCH;
+       int err;
+       struct rio_mport *mport = priv->mport;
+
+       mport->dma.dev = &priv->pdev->dev;
+       mport->dma.chancnt = nr_channels;
+
+       INIT_LIST_HEAD(&mport->dma.channels);
+
+       for (i = 0; i < nr_channels; i++) {
+               struct tsi721_bdma_chan *bdma_chan = &priv->bdma[i];
+
+               if (i == TSI721_DMACH_MAINT)
+                       continue;
+
+               bdma_chan->bd_num = 64;
+               bdma_chan->regs = priv->regs + TSI721_DMAC_BASE(i);
+
+               bdma_chan->dchan.device = &mport->dma;
+               bdma_chan->dchan.cookie = 1;
+               bdma_chan->dchan.chan_id = i;
+               bdma_chan->id = i;
+
+               spin_lock_init(&bdma_chan->lock);
+
+               INIT_LIST_HEAD(&bdma_chan->active_list);
+               INIT_LIST_HEAD(&bdma_chan->queue);
+               INIT_LIST_HEAD(&bdma_chan->free_list);
+
+               tasklet_init(&bdma_chan->tasklet, tsi721_dma_tasklet,
+                            (unsigned long)bdma_chan);
+               tasklet_disable(&bdma_chan->tasklet);
+               list_add_tail(&bdma_chan->dchan.device_node,
+                             &mport->dma.channels);
+       }
+
+       dma_cap_zero(mport->dma.cap_mask);
+       dma_cap_set(DMA_PRIVATE, mport->dma.cap_mask);
+       dma_cap_set(DMA_SLAVE, mport->dma.cap_mask);
+
+       mport->dma.device_alloc_chan_resources = tsi721_alloc_chan_resources;
+       mport->dma.device_free_chan_resources = tsi721_free_chan_resources;
+       mport->dma.device_tx_status = tsi721_tx_status;
+       mport->dma.device_issue_pending = tsi721_issue_pending;
+       mport->dma.device_prep_slave_sg = tsi721_prep_rio_sg;
+       mport->dma.device_control = tsi721_device_control;
+
+       err = dma_async_device_register(&mport->dma);
+       if (err)
+               dev_err(&priv->pdev->dev, "Failed to register DMA device\n");
+
+       return err;
+}