summaryrefslogtreecommitdiff
path: root/drivers/dma
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/imx-dma.c64
1 files changed, 18 insertions, 46 deletions
diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c
index 6e03f928ca8..629be353c63 100644
--- a/drivers/dma/imx-dma.c
+++ b/drivers/dma/imx-dma.c
@@ -111,29 +111,6 @@ enum imxdma_prep_type {
IMXDMA_DESC_CYCLIC,
};
-/*
- * struct imxdma_channel_internal - i.MX specific DMA extension
- * @name: name specified by DMA client
- * @irq_handler: client callback for end of transfer
- * @err_handler: client callback for error condition
- * @data: clients context data for callbacks
- * @dma_mode: direction of the transfer %DMA_MODE_READ or %DMA_MODE_WRITE
- * @sg: pointer to the actual read/written chunk for scatter-gather emulation
- * @resbytes: total residual number of bytes to transfer
- * (it can be lower or same as sum of SG mapped chunk sizes)
- * @sgcount: number of chunks to be read/written
- *
- * Structure is used for IMX DMA processing. It would be probably good
- * @struct dma_struct in the future for external interfacing and use
- * @struct imxdma_channel_internal only as extension to it.
- */
-
-struct imxdma_channel_internal {
- struct timer_list watchdog;
-
- int hw_chaining;
-};
-
struct imxdma_desc {
struct list_head node;
struct dma_async_tx_descriptor desc;
@@ -156,7 +133,8 @@ struct imxdma_desc {
};
struct imxdma_channel {
- struct imxdma_channel_internal internal;
+ int hw_chaining;
+ struct timer_list watchdog;
struct imxdma_engine *imxdma;
unsigned int channel;
@@ -217,10 +195,10 @@ static unsigned imx_dmav1_readl(unsigned offset)
return __raw_readl(imx_dmav1_baseaddr + offset);
}
-static int imxdma_hw_chain(struct imxdma_channel_internal *imxdma)
+static int imxdma_hw_chain(struct imxdma_channel *imxdmac)
{
if (cpu_is_mx27())
- return imxdma->hw_chaining;
+ return imxdmac->hw_chaining;
else
return 0;
}
@@ -269,7 +247,7 @@ static void imxdma_enable_hw(struct imxdma_desc *d)
CCR_ACRPT, DMA_CCR(channel));
if ((cpu_is_mx21() || cpu_is_mx27()) &&
- d->sg && imxdma_hw_chain(&imxdmac->internal)) {
+ d->sg && imxdma_hw_chain(imxdmac)) {
d->sg = sg_next(d->sg);
if (d->sg) {
u32 tmp;
@@ -290,8 +268,8 @@ static void imxdma_disable_hw(struct imxdma_channel *imxdmac)
pr_debug("imxdma%d: imx_dma_disable\n", channel);
- if (imxdma_hw_chain(&imxdmac->internal))
- del_timer(&imxdmac->internal.watchdog);
+ if (imxdma_hw_chain(imxdmac))
+ del_timer(&imxdmac->watchdog);
local_irq_save(flags);
imx_dmav1_writel(imx_dmav1_readl(DMA_DIMR) | (1 << channel), DMA_DIMR);
@@ -316,7 +294,6 @@ static void imxdma_watchdog(unsigned long data)
static irqreturn_t imxdma_err_handler(int irq, void *dev_id)
{
struct imxdma_engine *imxdma = dev_id;
- struct imxdma_channel_internal *internal;
unsigned int err_mask;
int i, disr;
int errcode;
@@ -336,7 +313,6 @@ static irqreturn_t imxdma_err_handler(int irq, void *dev_id)
for (i = 0; i < IMX_DMA_CHANNELS; i++) {
if (!(err_mask & (1 << i)))
continue;
- internal = &imxdma->channel[i].internal;
errcode = 0;
if (imx_dmav1_readl(DMA_DBTOSR) & (1 << i)) {
@@ -370,7 +346,6 @@ static irqreturn_t imxdma_err_handler(int irq, void *dev_id)
static void dma_irq_handle_channel(struct imxdma_channel *imxdmac)
{
- struct imxdma_channel_internal *imxdma = &imxdmac->internal;
int chno = imxdmac->channel;
struct imxdma_desc *desc;
@@ -394,11 +369,11 @@ static void dma_irq_handle_channel(struct imxdma_channel *imxdmac)
tmp = imx_dmav1_readl(DMA_CCR(chno));
- if (imxdma_hw_chain(imxdma)) {
+ if (imxdma_hw_chain(imxdmac)) {
/* FIXME: The timeout should probably be
* configurable
*/
- mod_timer(&imxdma->watchdog,
+ mod_timer(&imxdmac->watchdog,
jiffies + msecs_to_jiffies(500));
tmp |= CCR_CEN | CCR_RPT | CCR_ACRPT;
@@ -417,8 +392,8 @@ static void dma_irq_handle_channel(struct imxdma_channel *imxdmac)
return;
}
- if (imxdma_hw_chain(imxdma)) {
- del_timer(&imxdma->watchdog);
+ if (imxdma_hw_chain(imxdmac)) {
+ del_timer(&imxdmac->watchdog);
return;
}
}
@@ -432,7 +407,6 @@ out:
static irqreturn_t dma_irq_handler(int irq, void *dev_id)
{
struct imxdma_engine *imxdma = dev_id;
- struct imxdma_channel_internal *internal;
int i, disr;
if (cpu_is_mx21() || cpu_is_mx27())
@@ -445,10 +419,8 @@ static irqreturn_t dma_irq_handler(int irq, void *dev_id)
imx_dmav1_writel(disr, DMA_DISR);
for (i = 0; i < IMX_DMA_CHANNELS; i++) {
- if (disr & (1 << i)) {
- internal = &imxdma->channel[i].internal;
+ if (disr & (1 << i))
dma_irq_handle_channel(&imxdma->channel[i]);
- }
}
return IRQ_HANDLED;
@@ -591,8 +563,8 @@ static int imxdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
break;
}
- imxdmac->internal.hw_chaining = 1;
- if (!imxdma_hw_chain(&imxdmac->internal))
+ imxdmac->hw_chaining = 1;
+ if (!imxdma_hw_chain(imxdmac))
return -EINVAL;
imxdmac->ccr_from_device = (mode | IMX_DMA_TYPE_FIFO) |
((IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) << 2) |
@@ -917,7 +889,7 @@ static int __init imxdma_probe(struct platform_device *pdev)
/* Initialize channel parameters */
for (i = 0; i < IMX_DMA_CHANNELS; i++) {
struct imxdma_channel *imxdmac = &imxdma->channel[i];
- memset(&imxdmac->internal, 0, sizeof(imxdmac->internal));
+
if (cpu_is_mx21() || cpu_is_mx27()) {
ret = request_irq(MX2x_INT_DMACH0 + i,
dma_irq_handler, 0, "DMA", imxdma);
@@ -926,9 +898,9 @@ static int __init imxdma_probe(struct platform_device *pdev)
MX2x_INT_DMACH0 + i, i);
goto err_init;
}
- init_timer(&imxdmac->internal.watchdog);
- imxdmac->internal.watchdog.function = &imxdma_watchdog;
- imxdmac->internal.watchdog.data = (unsigned long)imxdmac;
+ init_timer(&imxdmac->watchdog);
+ imxdmac->watchdog.function = &imxdma_watchdog;
+ imxdmac->watchdog.data = (unsigned long)imxdmac;
}
imxdmac->imxdma = imxdma;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-07 14:45:26 +0000