target/linux/coldfire/patches/037-m5445x_edma_callback.patch

   1 From acd937ac924aefd22ea9a66ea621ab80a4f9b594 Mon Sep 17 00:00:00 2001
   2 From: Kurt Mahan <kmahan@freescale.com>
   3 Date: Mon, 10 Dec 2007 03:37:19 -0700
   4 Subject: [PATCH] Update EDMA driver to allow callback/arg changes.
   5
   6 LTIBName: m5445x-edma-callback
   7 Signed-off-by: Kurt Mahan <kmahan@freescale.com>
   8 ---
   9  drivers/spi/coldfire_edma.c      |   27 +++++++++++++++++++++++++++
  10  include/asm-m68k/coldfire_edma.h |   20 ++++++++++++++++++++
  11  2 files changed, 47 insertions(+), 0 deletions(-)
  12
  13 --- a/drivers/spi/coldfire_edma.c
  14 +++ b/drivers/spi/coldfire_edma.c
  15 @@ -206,6 +206,31 @@ int request_edma_channel(int channel,
  16  EXPORT_SYMBOL(request_edma_channel);
  17
  18  /**
  19 + * set_edma_callback - Update the channel callback/arg
  20 + * @channel: channel number
  21 + * @handler: dma handler
  22 + * @error_handler: dma error handler
  23 + * @arg: argument to pass back
  24 + *
  25 + * Returns 0 if success or a negative value if failure
  26 + */
  27 +int set_edma_callback(int channel,
  28 +       edma_irq_handler handler,
  29 +       edma_error_handler error_handler,
  30 +       void *arg )
  31 +{
  32 +       if (devp!=NULL && channel>=0 && channel<=EDMA_CHANNELS &&
  33 +           devp->dma_interrupt_handlers[channel].allocated) {
  34 +               devp->dma_interrupt_handlers[channel].irq_handler = handler;
  35 +               devp->dma_interrupt_handlers[channel].error_handler = error_handler;
  36 +               devp->dma_interrupt_handlers[channel].arg = arg;
  37 +               return 0;
  38 +       }
  39 +       return -EINVAL;
  40 +}
  41 +EXPORT_SYMBOL(set_edma_callback);
  42 +
  43 +/**
  44   * free_edma_channel - Free the edma channel
  45   * @channel: channel number
  46   * @arg: argument created with
  47 @@ -216,8 +241,10 @@ int free_edma_channel(int channel, void
  48  {
  49         if (devp!=NULL && channel>=0 && channel<=EDMA_CHANNELS) {
  50                 if (devp->dma_interrupt_handlers[channel].allocated) {
  51 +#if 0
  52                         if (devp->dma_interrupt_handlers[channel].arg != arg)
  53                                 return -EBUSY;
  54 +#endif
  55
  56                         devp->dma_interrupt_handlers[channel].allocated = 0;
  57                         devp->dma_interrupt_handlers[channel].arg = NULL;
  58 --- a/include/asm-m68k/coldfire_edma.h
  59 +++ b/include/asm-m68k/coldfire_edma.h
  60 @@ -96,10 +96,30 @@ int request_edma_channel(int channel,
  61                 void *dev,
  62                 spinlock_t *lock,
  63                 const char *device_id);
  64 +
  65 +/**
  66 + * set_edma_callback - Update the channel callback/arg
  67 + * @channel: channel number
  68 + * @handler: dma handler
  69 + * @error_handler: dma error handler
  70 + * @arg: argument to pass back
  71 + *
  72 + * Returns 0 if success or a negative value if failure
  73 + */
  74 +int set_edma_callback(int channel,
  75 +               edma_irq_handler handler,
  76 +               edma_error_handler error_handler,
  77 +               void *arg);
  78
  79  /* Free eDMA channel
  80   *  channel - eDMA TCD number
  81   *  dev - device
  82   */
  83  int free_edma_channel(int channel, void *dev);
  84 +
  85 +/*
  86 + * DMA Modes
  87 + */
  88 +#define        DMA_MODE_READ           0
  89 +#define DMA_MODE_WRITE         1
  90  #endif