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