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Diffstat (limited to 'arch/arm/mach-msm/dma.c')
-rw-r--r--arch/arm/mach-msm/dma.c23
1 files changed, 21 insertions, 2 deletions
diff --git a/arch/arm/mach-msm/dma.c b/arch/arm/mach-msm/dma.c
index 8df798ac70c7..d029d1f5f9e2 100644
--- a/arch/arm/mach-msm/dma.c
+++ b/arch/arm/mach-msm/dma.c
@@ -13,6 +13,8 @@
*
*/
+#include <linux/clk.h>
+#include <linux/err.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <mach/dma.h>
@@ -26,6 +28,7 @@ enum {
};
static DEFINE_SPINLOCK(msm_dmov_lock);
+static struct clk *msm_dmov_clk;
static unsigned int channel_active;
static struct list_head ready_commands[MSM_DMOV_CHANNEL_COUNT];
static struct list_head active_commands[MSM_DMOV_CHANNEL_COUNT];
@@ -54,6 +57,9 @@ void msm_dmov_enqueue_cmd(unsigned id, struct msm_dmov_cmd *cmd)
unsigned int status;
spin_lock_irqsave(&msm_dmov_lock, irq_flags);
+ if (!channel_active)
+ clk_enable(msm_dmov_clk);
+ dsb();
status = readl(DMOV_STATUS(id));
if (list_empty(&ready_commands[id]) &&
(status & DMOV_STATUS_CMD_PTR_RDY)) {
@@ -72,6 +78,8 @@ void msm_dmov_enqueue_cmd(unsigned id, struct msm_dmov_cmd *cmd)
channel_active |= 1U << id;
writel(cmd->cmdptr, DMOV_CMD_PTR(id));
} else {
+ if (!channel_active)
+ clk_disable(msm_dmov_clk);
if (list_empty(&active_commands[id]))
PRINT_ERROR("msm_dmov_enqueue_cmd(%d), error datamover stalled, status %x\n", id, status);
@@ -168,6 +176,7 @@ static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_id)
"for %p, result %x\n", id, cmd, ch_result);
if (cmd) {
list_del(&cmd->list);
+ dsb();
cmd->complete_func(cmd, ch_result, NULL);
}
}
@@ -184,6 +193,7 @@ static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_id)
PRINT_FLOW("msm_datamover_irq_handler id %d, flush, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
if (cmd) {
list_del(&cmd->list);
+ dsb();
cmd->complete_func(cmd, ch_result, &errdata);
}
}
@@ -201,6 +211,7 @@ static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_id)
PRINT_ERROR("msm_datamover_irq_handler id %d, error, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
if (cmd) {
list_del(&cmd->list);
+ dsb();
cmd->complete_func(cmd, ch_result, &errdata);
}
/* this does not seem to work, once we get an error */
@@ -224,8 +235,10 @@ static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_id)
PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
}
- if (!channel_active)
- disable_irq(INT_ADM_AARM);
+ if (!channel_active) {
+ disable_irq_nosync(INT_ADM_AARM);
+ clk_disable(msm_dmov_clk);
+ }
spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
return IRQ_HANDLED;
@@ -235,11 +248,17 @@ static int __init msm_init_datamover(void)
{
int i;
int ret;
+ struct clk *clk;
+
for (i = 0; i < MSM_DMOV_CHANNEL_COUNT; i++) {
INIT_LIST_HEAD(&ready_commands[i]);
INIT_LIST_HEAD(&active_commands[i]);
writel(DMOV_CONFIG_IRQ_EN | DMOV_CONFIG_FORCE_TOP_PTR_RSLT | DMOV_CONFIG_FORCE_FLUSH_RSLT, DMOV_CONFIG(i));
}
+ clk = clk_get(NULL, "adm_clk");
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+ msm_dmov_clk = clk;
ret = request_irq(INT_ADM_AARM, msm_datamover_irq_handler, 0, "msmdatamover", NULL);
if (ret)
return ret;