ARM: pxa: transition to dmaengine phase 1
In order to slowly transition pxa to dmaengine, the legacy code will now
rely on dmaengine to request a channel.
This implies that PXA architecture selects DMADEVICES and PXA_DMA,
which is not pretty. Yet it enables PXA drivers to be ported one by one,
with part of them using dmaengine, and the other part using the legacy
code.
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
diff --git a/arch/arm/plat-pxa/dma.c b/arch/arm/plat-pxa/dma.c
index d92f07f..de2b061 100644
--- a/arch/arm/plat-pxa/dma.c
+++ b/arch/arm/plat-pxa/dma.c
@@ -289,7 +289,8 @@
/* try grabbing a DMA channel with the requested priority */
for (i = 0; i < num_dma_channels; i++) {
if ((dma_channels[i].prio == prio) &&
- !dma_channels[i].name) {
+ !dma_channels[i].name &&
+ !pxad_toggle_reserved_channel(i)) {
found = 1;
break;
}
@@ -326,13 +327,14 @@
local_irq_save(flags);
DCSR(dma_ch) = DCSR_STARTINTR|DCSR_ENDINTR|DCSR_BUSERR;
dma_channels[dma_ch].name = NULL;
+ pxad_toggle_reserved_channel(dma_ch);
local_irq_restore(flags);
}
EXPORT_SYMBOL(pxa_free_dma);
static irqreturn_t dma_irq_handler(int irq, void *dev_id)
{
- int i, dint = DINT;
+ int i, dint = DINT, done = 0;
struct dma_channel *channel;
while (dint) {
@@ -341,16 +343,13 @@
channel = &dma_channels[i];
if (channel->name && channel->irq_handler) {
channel->irq_handler(i, channel->data);
- } else {
- /*
- * IRQ for an unregistered DMA channel:
- * let's clear the interrupts and disable it.
- */
- printk (KERN_WARNING "spurious IRQ for DMA channel %d\n", i);
- DCSR(i) = DCSR_STARTINTR|DCSR_ENDINTR|DCSR_BUSERR;
+ done++;
}
}
- return IRQ_HANDLED;
+ if (done)
+ return IRQ_HANDLED;
+ else
+ return IRQ_NONE;
}
int __init pxa_init_dma(int irq, int num_ch)
@@ -372,7 +371,8 @@
spin_lock_init(&dma_channels[i].lock);
}
- ret = request_irq(irq, dma_irq_handler, 0, "DMA", NULL);
+ ret = request_irq(irq, dma_irq_handler, IRQF_SHARED, "DMA",
+ dma_channels);
if (ret) {
printk (KERN_CRIT "Wow! Can't register IRQ for DMA\n");
kfree(dma_channels);