- 根目录:
- drivers
- rapidio
- devices
- tsi721_dma.c
/*
* 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);
if (bdma_chan->active)
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 */
bdma_chan->active = true;
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);
struct tsi721_device *priv = to_tsi721(dchan->device);
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));
tsi721_bdma_interrupt_enable(bdma_chan, 0);
bdma_chan->active = false;
#ifdef CONFIG_PCI_MSI
if (priv->flags & TSI721_USING_MSIX) {
synchronize_irq(priv->msix[TSI721_VECT_DMA0_DONE +
bdma_chan->id].vector);
synchronize_irq(priv->msix[TSI721_VECT_DMA0_INT +
bdma_chan->id].vector);
} else
#endif
synchronize_irq(priv->pdev->irq);
tasklet_kill(&bdma_chan->tasklet);
spin_lock_bh(&bdma_chan->lock);
list_splice_init(&bdma_chan->free_list, &list);
spin_unlock_bh(&bdma_chan->lock);
#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 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;
bdma_chan->active = false;
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);
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;
}