arch/arm/mach-footbridge/dma.c

   1 /*
   2  *  linux/arch/arm/kernel/dma-ebsa285.c
   3  *
   4  *  Copyright (C) 1998 Phil Blundell
   5  *
   6  * DMA functions specific to EBSA-285/CATS architectures
   7  *
   8  *  Changelog:
   9  *   09-Nov-1998 RMK    Split out ISA DMA functions to dma-isa.c
  10  *   17-Mar-1999 RMK    Allow any EBSA285-like architecture to have
  11  *                      ISA DMA controllers.
  12  */
  13 #include <linux/init.h>
  14
  15 #include <asm/dma.h>
  16 #include <asm/io.h>
  17 #include <asm/scatterlist.h>
  18
  19 #include <asm/mach/dma.h>
  20 #include <asm/hardware/dec21285.h>
  21
  22 #if 0
  23 static int fb_dma_request(dmach_t channel, dma_t *dma)
  24 {
  25         return -EINVAL;
  26 }
  27
  28 static void fb_dma_enable(dmach_t channel, dma_t *dma)
  29 {
  30 }
  31
  32 static void fb_dma_disable(dmach_t channel, dma_t *dma)
  33 {
  34 }
  35
  36 static struct dma_ops fb_dma_ops = {
  37         .type           = "fb",
  38         .request        = fb_dma_request,
  39         .enable         = fb_dma_enable,
  40         .disable        = fb_dma_disable,
  41 };
  42 #endif
  43
  44 void __init arch_dma_init(dma_t *dma)
  45 {
  46 #if 0
  47         dma[_DC21285_DMA(0)].d_ops = &fb_dma_ops;
  48         dma[_DC21285_DMA(1)].d_ops = &fb_dma_ops;
  49 #endif
  50 #ifdef CONFIG_ISA_DMA
  51         if (footbridge_cfn_mode())
  52                 isa_init_dma(dma + _ISA_DMA(0));
  53 #endif
  54 }