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authorRobert Jarzmik <robert.jarzmik@free.fr>2015-02-15 01:38:39 +0300
committerRobert Jarzmik <robert.jarzmik@free.fr>2015-07-18 13:16:33 +0300
commit4be0856fa34ef3b0681aeec669e50c13e394f145 (patch)
tree76bd16b3ba03eaac9bab6fa284e40215d62781be /arch/arm/plat-pxa
parentd770e558e21961ad6cfdf0ff7df0eb5d7d4f0754 (diff)
downloadlinux-4be0856fa34ef3b0681aeec669e50c13e394f145.tar.xz
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>
Diffstat (limited to 'arch/arm/plat-pxa')
-rw-r--r--arch/arm/plat-pxa/dma.c22
-rw-r--r--arch/arm/plat-pxa/include/plat/dma.h15
2 files changed, 26 insertions, 11 deletions
diff --git a/arch/arm/plat-pxa/dma.c b/arch/arm/plat-pxa/dma.c
index d92f07f6ecfb..de2b061889ec 100644
--- a/arch/arm/plat-pxa/dma.c
+++ b/arch/arm/plat-pxa/dma.c
@@ -289,7 +289,8 @@ int pxa_request_dma (char *name, pxa_dma_prio prio,
/* 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 @@ void pxa_free_dma (int dma_ch)
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 @@ static irqreturn_t dma_irq_handler(int irq, void *dev_id)
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 @@ int __init pxa_init_dma(int irq, int num_ch)
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);
diff --git a/arch/arm/plat-pxa/include/plat/dma.h b/arch/arm/plat-pxa/include/plat/dma.h
index a7b91dc06852..28848b344e2d 100644
--- a/arch/arm/plat-pxa/include/plat/dma.h
+++ b/arch/arm/plat-pxa/include/plat/dma.h
@@ -82,4 +82,19 @@ int pxa_request_dma (char *name,
void pxa_free_dma (int dma_ch);
+/*
+ * Cooperation with pxa_dma + dmaengine while there remains at least one pxa
+ * driver not converted to dmaengine.
+ */
+#if defined(CONFIG_PXA_DMA)
+extern int pxad_toggle_reserved_channel(int legacy_channel);
+#else
+static inline int pxad_toggle_reserved_channel(int legacy_channel)
+{
+ return 0;
+}
+#endif
+
+extern void __init pxa2xx_set_dmac_info(int nb_channels);
+
#endif /* __PLAT_DMA_H */