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dmaengine: xilinx_vdma: Use readl_poll_timeout instead of do while loop's

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It is sometimes necessary to poll a memory-mapped register until its
value satisfies some condition use convenience macros
that do this instead of do while loop's.

This patch updates the same in the driver.

Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Kedareswara rao Appana 2016-02-26 19:33:54 +05:30 committed by Vinod Koul
parent 26c5e36931
commit 9495f26482
1 changed files with 22 additions and 24 deletions
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46
drivers/dma/xilinx/xilinx_vdma.c
View file

@ -28,6 +28,7 @@
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_dma.h>
@ -254,6 +255,9 @@ struct xilinx_vdma_device {
container_of(chan, struct xilinx_vdma_chan, common)
#define to_vdma_tx_descriptor(tx) \
container_of(tx, struct xilinx_vdma_tx_descriptor, async_tx)
#define xilinx_vdma_poll_timeout(chan, reg, val, cond, delay_us, timeout_us) \
readl_poll_timeout(chan->xdev->regs + chan->ctrl_offset + reg, val, \
cond, delay_us, timeout_us)
/* IO accessors */
static inline u32 vdma_read(struct xilinx_vdma_chan *chan, u32 reg)
@ -550,18 +554,17 @@ static bool xilinx_vdma_is_idle(struct xilinx_vdma_chan *chan)
*/
static void xilinx_vdma_halt(struct xilinx_vdma_chan *chan)
{
int loop = XILINX_VDMA_LOOP_COUNT;
int err = 0;
u32 val;
vdma_ctrl_clr(chan, XILINX_VDMA_REG_DMACR, XILINX_VDMA_DMACR_RUNSTOP);
/* Wait for the hardware to halt */
do {
if (vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR) &
XILINX_VDMA_DMASR_HALTED)
break;
} while (loop--);
err = xilinx_vdma_poll_timeout(chan, XILINX_VDMA_REG_DMASR, val,
(val & XILINX_VDMA_DMASR_HALTED), 0,
XILINX_VDMA_LOOP_COUNT);
if (!loop) {
if (err) {
dev_err(chan->dev, "Cannot stop channel %p: %x\n",
chan, vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR));
chan->err = true;
@ -576,18 +579,17 @@ static void xilinx_vdma_halt(struct xilinx_vdma_chan *chan)
*/
static void xilinx_vdma_start(struct xilinx_vdma_chan *chan)
{
int loop = XILINX_VDMA_LOOP_COUNT;
int err = 0;
u32 val;
vdma_ctrl_set(chan, XILINX_VDMA_REG_DMACR, XILINX_VDMA_DMACR_RUNSTOP);
/* Wait for the hardware to start */
do {
if (!(vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR) &
XILINX_VDMA_DMASR_HALTED))
break;
} while (loop--);
err = xilinx_vdma_poll_timeout(chan, XILINX_VDMA_REG_DMASR, val,
!(val & XILINX_VDMA_DMASR_HALTED), 0,
XILINX_VDMA_LOOP_COUNT);
if (!loop) {
if (err) {
dev_err(chan->dev, "Cannot start channel %p: %x\n",
chan, vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR));
@ -754,21 +756,17 @@ static void xilinx_vdma_complete_descriptor(struct xilinx_vdma_chan *chan)
*/
static int xilinx_vdma_reset(struct xilinx_vdma_chan *chan)
{
int loop = XILINX_VDMA_LOOP_COUNT;
int err = 0;
u32 tmp;
vdma_ctrl_set(chan, XILINX_VDMA_REG_DMACR, XILINX_VDMA_DMACR_RESET);
tmp = vdma_ctrl_read(chan, XILINX_VDMA_REG_DMACR) &
XILINX_VDMA_DMACR_RESET;
/* Wait for the hardware to finish reset */
do {
tmp = vdma_ctrl_read(chan, XILINX_VDMA_REG_DMACR) &
XILINX_VDMA_DMACR_RESET;
} while (loop-- && tmp);
err = xilinx_vdma_poll_timeout(chan, XILINX_VDMA_REG_DMACR, tmp,
!(tmp & XILINX_VDMA_DMACR_RESET), 0,
XILINX_VDMA_LOOP_COUNT);
if (!loop) {
if (err) {
dev_err(chan->dev, "reset timeout, cr %x, sr %x\n",
vdma_ctrl_read(chan, XILINX_VDMA_REG_DMACR),
vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR));
@ -777,7 +775,7 @@ static int xilinx_vdma_reset(struct xilinx_vdma_chan *chan)
chan->err = false;
return 0;
return err;
}
/**