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 #include <linux/io.h>
  15 #include <linux/spinlock.h>
  16
  17 #include <asm/dma.h>
  18 #include <asm/scatterlist.h>
  19
  20 #include <asm/mach/dma.h>
  21 #include <asm/hardware/dec21285.h>
  22
  23 #if 0
  24 static int fb_dma_request(unsigned int chan, dma_t *dma)
  25 {
  26         return -EINVAL;
  27 }
  28
  29 static void fb_dma_enable(unsigned int chan, dma_t *dma)
  30 {
  31 }
  32
  33 static void fb_dma_disable(unsigned int chan, dma_t *dma)
  34 {
  35 }
  36
  37 static struct dma_ops fb_dma_ops = {
  38         .type           = "fb",
  39         .request        = fb_dma_request,
  40         .enable         = fb_dma_enable,
  41         .disable        = fb_dma_disable,
  42 };
  43 #endif
  44
  45 static int __init fb_dma_init(void)
  46 {
  47 #if 0
  48         dma[_DC21285_DMA(0)].d_ops = &fb_dma_ops;
  49         dma[_DC21285_DMA(1)].d_ops = &fb_dma_ops;
  50 #endif
  51 #ifdef CONFIG_ISA_DMA
  52         if (footbridge_cfn_mode())
  53                 isa_init_dma();
  54 #endif
  55         return 0;
  56 }
  57 core_initcall(fb_dma_init);