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From acd937ac924aefd22ea9a66ea621ab80a4f9b594 Mon Sep 17 00:00:00 2001
From: Kurt Mahan <kmahan@freescale.com>
Date: Mon, 10 Dec 2007 03:37:19 -0700
Subject: [PATCH] Update EDMA driver to allow callback/arg changes.
LTIBName: m5445x-edma-callback
Signed-off-by: Kurt Mahan <kmahan@freescale.com>
---
drivers/spi/coldfire_edma.c | 27 +++++++++++++++++++++++++++
include/asm-m68k/coldfire_edma.h | 20 ++++++++++++++++++++
2 files changed, 47 insertions(+), 0 deletions(-)
--- a/drivers/spi/coldfire_edma.c
+++ b/drivers/spi/coldfire_edma.c
@@ -206,6 +206,31 @@ int request_edma_channel(int channel,
EXPORT_SYMBOL(request_edma_channel);
/**
+ * set_edma_callback - Update the channel callback/arg
+ * @channel: channel number
+ * @handler: dma handler
+ * @error_handler: dma error handler
+ * @arg: argument to pass back
+ *
+ * Returns 0 if success or a negative value if failure
+ */
+int set_edma_callback(int channel,
+ edma_irq_handler handler,
+ edma_error_handler error_handler,
+ void *arg )
+{
+ if (devp!=NULL && channel>=0 && channel<=EDMA_CHANNELS &&
+ devp->dma_interrupt_handlers[channel].allocated) {
+ devp->dma_interrupt_handlers[channel].irq_handler = handler;
+ devp->dma_interrupt_handlers[channel].error_handler = error_handler;
+ devp->dma_interrupt_handlers[channel].arg = arg;
+ return 0;
+ }
+ return -EINVAL;
+}
+EXPORT_SYMBOL(set_edma_callback);
+
+/**
* free_edma_channel - Free the edma channel
* @channel: channel number
* @arg: argument created with
@@ -216,8 +241,10 @@ int free_edma_channel(int channel, void
{
if (devp!=NULL && channel>=0 && channel<=EDMA_CHANNELS) {
if (devp->dma_interrupt_handlers[channel].allocated) {
+#if 0
if (devp->dma_interrupt_handlers[channel].arg != arg)
return -EBUSY;
+#endif
devp->dma_interrupt_handlers[channel].allocated = 0;
devp->dma_interrupt_handlers[channel].arg = NULL;
--- a/include/asm-m68k/coldfire_edma.h
+++ b/include/asm-m68k/coldfire_edma.h
@@ -96,10 +96,30 @@ int request_edma_channel(int channel,
void *dev,
spinlock_t *lock,
const char *device_id);
+
+/**
+ * set_edma_callback - Update the channel callback/arg
+ * @channel: channel number
+ * @handler: dma handler
+ * @error_handler: dma error handler
+ * @arg: argument to pass back
+ *
+ * Returns 0 if success or a negative value if failure
+ */
+int set_edma_callback(int channel,
+ edma_irq_handler handler,
+ edma_error_handler error_handler,
+ void *arg);
/* Free eDMA channel
* channel - eDMA TCD number
* dev - device
*/
int free_edma_channel(int channel, void *dev);
+
+/*
+ * DMA Modes
+ */
+#define DMA_MODE_READ 0
+#define DMA_MODE_WRITE 1
#endif
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