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-rw-r--r--arch/arm/mach-pxa/dma.c44
-rw-r--r--arch/arm/mach-pxa/pxa25x.c5
-rw-r--r--arch/arm/mach-pxa/pxa27x.c3
-rw-r--r--include/asm-arm/arch-pxa/dma.h22
4 files changed, 41 insertions, 33 deletions
diff --git a/arch/arm/mach-pxa/dma.c b/arch/arm/mach-pxa/dma.c
index 4440babe7b97..93c4f31f127f 100644
--- a/arch/arm/mach-pxa/dma.c
+++ b/arch/arm/mach-pxa/dma.c
@@ -25,12 +25,15 @@
#include <asm/arch/pxa-regs.h>
-static struct dma_channel {
+struct dma_channel {
char *name;
+ pxa_dma_prio prio;
void (*irq_handler)(int, void *);
void *data;
-} dma_channels[PXA_DMA_CHANNELS];
+};
+static struct dma_channel *dma_channels;
+static int num_dma_channels;
int pxa_request_dma (char *name, pxa_dma_prio prio,
void (*irq_handler)(int, void *),
@@ -47,8 +50,9 @@ int pxa_request_dma (char *name, pxa_dma_prio prio,
do {
/* try grabbing a DMA channel with the requested priority */
- pxa_for_each_dma_prio (i, prio) {
- if (!dma_channels[i].name) {
+ for (i = 0; i < num_dma_channels; i++) {
+ if ((dma_channels[i].prio == prio) &&
+ !dma_channels[i].name) {
found = 1;
break;
}
@@ -91,7 +95,7 @@ static irqreturn_t dma_irq_handler(int irq, void *dev_id)
{
int i, dint = DINT;
- for (i = 0; i < PXA_DMA_CHANNELS; i++) {
+ for (i = 0; i < num_dma_channels; i++) {
if (dint & (1 << i)) {
struct dma_channel *channel = &dma_channels[i];
if (channel->name && channel->irq_handler) {
@@ -109,18 +113,32 @@ static irqreturn_t dma_irq_handler(int irq, void *dev_id)
return IRQ_HANDLED;
}
-static int __init pxa_dma_init (void)
+int __init pxa_init_dma(int num_ch)
{
- int ret;
+ int i, ret;
- ret = request_irq (IRQ_DMA, dma_irq_handler, 0, "DMA", NULL);
- if (ret)
+ dma_channels = kzalloc(sizeof(struct dma_channel) * num_ch, GFP_KERNEL);
+ if (dma_channels == NULL)
+ return -ENOMEM;
+
+ ret = request_irq(IRQ_DMA, dma_irq_handler, IRQF_DISABLED, "DMA", NULL);
+ if (ret) {
printk (KERN_CRIT "Wow! Can't register IRQ for DMA\n");
- return ret;
-}
+ kfree(dma_channels);
+ return ret;
+ }
-arch_initcall(pxa_dma_init);
+ /* dma channel priorities on pxa2xx processors:
+ * ch 0 - 3, 16 - 19 <--> (0) DMA_PRIO_HIGH
+ * ch 4 - 7, 20 - 23 <--> (1) DMA_PRIO_MEDIUM
+ * ch 8 - 15, 24 - 31 <--> (2) DMA_PRIO_LOW
+ */
+ for (i = 0; i < num_ch; i++)
+ dma_channels[i].prio = min((i & 0xf) >> 2, DMA_PRIO_LOW);
+
+ num_dma_channels = num_ch;
+ return 0;
+}
EXPORT_SYMBOL(pxa_request_dma);
EXPORT_SYMBOL(pxa_free_dma);
-
diff --git a/arch/arm/mach-pxa/pxa25x.c b/arch/arm/mach-pxa/pxa25x.c
index a8796aea8353..13437582342d 100644
--- a/arch/arm/mach-pxa/pxa25x.c
+++ b/arch/arm/mach-pxa/pxa25x.c
@@ -25,6 +25,7 @@
#include <asm/arch/irqs.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/pm.h>
+#include <asm/arch/dma.h>
#include "generic.h"
@@ -137,7 +138,11 @@ void __init pxa25x_init_irq(void)
static int __init pxa25x_init(void)
{
+ int ret = 0;
+
if (cpu_is_pxa21x() || cpu_is_pxa25x()) {
+ if ((ret = pxa_init_dma(16)))
+ return ret;
#ifdef CONFIG_PM
pm_set_ops(&pxa25x_pm_ops);
#endif
diff --git a/arch/arm/mach-pxa/pxa27x.c b/arch/arm/mach-pxa/pxa27x.c
index 1407985c8ab0..5b819e2c5563 100644
--- a/arch/arm/mach-pxa/pxa27x.c
+++ b/arch/arm/mach-pxa/pxa27x.c
@@ -23,6 +23,7 @@
#include <asm/arch/pxa-regs.h>
#include <asm/arch/ohci.h>
#include <asm/arch/pm.h>
+#include <asm/arch/dma.h>
#include "generic.h"
@@ -214,6 +215,8 @@ static int __init pxa27x_init(void)
{
int ret = 0;
if (cpu_is_pxa27x()) {
+ if ((ret = pxa_init_dma(32)))
+ return ret;
#ifdef CONFIG_PM
pm_set_ops(&pxa27x_pm_ops);
#endif
diff --git a/include/asm-arm/arch-pxa/dma.h b/include/asm-arm/arch-pxa/dma.h
index bed042d71d68..3280ee2ddfa5 100644
--- a/include/asm-arm/arch-pxa/dma.h
+++ b/include/asm-arm/arch-pxa/dma.h
@@ -30,30 +30,12 @@ typedef enum {
DMA_PRIO_LOW = 2
} pxa_dma_prio;
-#if defined(CONFIG_PXA27x)
-
-#define PXA_DMA_CHANNELS 32
-
-#define pxa_for_each_dma_prio(ch, prio) \
-for ( \
- ch = prio * 4; \
- ch != (4 << prio) + 16; \
- ch = (ch + 1 == (4 << prio)) ? (prio * 4 + 16) : (ch + 1) \
-)
-
-#elif defined(CONFIG_PXA25x)
-
-#define PXA_DMA_CHANNELS 16
-
-#define pxa_for_each_dma_prio(ch, prio) \
- for (ch = prio * 4; ch != (4 << prio); ch++)
-
-#endif
-
/*
* DMA registration
*/
+int __init pxa_init_dma(int num_ch);
+
int pxa_request_dma (char *name,
pxa_dma_prio prio,
void (*irq_handler)(int, void *),
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