rapidio/tsi721: add DMA engine support
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>
diff --git a/drivers/rapidio/devices/tsi721_dma.c b/drivers/rapidio/devices/tsi721_dma.c
new file mode 100644
index 0000000..92e06a5
--- /dev/null
+++ b/drivers/rapidio/devices/tsi721_dma.c
@@ -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;
+}