drivers/sbus/dvma.c

   1 /* dvma.c:  Routines that are used to access DMA on the Sparc SBus.
   2  *
   3  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   4  */
   5
   6 #include <linux/config.h>
   7 #include <linux/string.h>
   8 #include <linux/kernel.h>
   9 #include <linux/slab.h>
  10 #include <linux/init.h>
  11 #include <linux/delay.h>
  12
  13 #include <asm/oplib.h>
  14 #include <asm/io.h>
  15 #include <asm/dma.h>
  16 #include <asm/sbus.h>
  17
  18 struct sbus_dma *dma_chain;
  19
  20 void __init init_one_dvma(struct sbus_dma *dma, int num_dma)
  21 {
  22         printk("dma%d: ", num_dma);
  23
  24         dma->next = NULL;
  25         dma->running = 0;      /* No transfers going on as of yet */
  26         dma->allocated = 0;    /* No one has allocated us yet */
  27         switch(sbus_readl(dma->regs + DMA_CSR)&DMA_DEVICE_ID) {
  28         case DMA_VERS0:
  29                 dma->revision = dvmarev0;
  30                 printk("Revision 0 ");
  31                 break;
  32         case DMA_ESCV1:
  33                 dma->revision = dvmaesc1;
  34                 printk("ESC Revision 1 ");
  35                 break;
  36         case DMA_VERS1:
  37                 dma->revision = dvmarev1;
  38                 printk("Revision 1 ");
  39                 break;
  40         case DMA_VERS2:
  41                 dma->revision = dvmarev2;
  42                 printk("Revision 2 ");
  43                 break;
  44         case DMA_VERHME:
  45                 dma->revision = dvmahme;
  46                 printk("HME DVMA gate array ");
  47                 break;
  48         case DMA_VERSPLUS:
  49                 dma->revision = dvmarevplus;
  50                 printk("Revision 1 PLUS ");
  51                 break;
  52         default:
  53                 printk("unknown dma version %08x",
  54                        sbus_readl(dma->regs + DMA_CSR) & DMA_DEVICE_ID);
  55                 dma->allocated = 1;
  56                 break;
  57         }
  58         printk("\n");
  59 }
  60
  61 /* Probe this SBus DMA module(s) */
  62 void __init dvma_init(struct sbus_bus *sbus)
  63 {
  64         struct sbus_dev *this_dev;
  65         struct sbus_dma *dma;
  66         struct sbus_dma *dchain;
  67         static int num_dma = 0;
  68
  69         for_each_sbusdev(this_dev, sbus) {
  70                 char *name = this_dev->prom_name;
  71                 int hme = 0;
  72
  73                 if(!strcmp(name, "SUNW,fas"))
  74                         hme = 1;
  75                 else if(strcmp(name, "dma") &&
  76                         strcmp(name, "ledma") &&
  77                         strcmp(name, "espdma"))
  78                         continue;
  79
  80                 /* Found one... */
  81                 dma = kmalloc(sizeof(struct sbus_dma), GFP_ATOMIC);
  82
  83                 dma->sdev = this_dev;
  84
  85                 /* Put at end of dma chain */
  86                 dchain = dma_chain;
  87                 if(dchain) {
  88                         while(dchain->next)
  89                                 dchain = dchain->next;
  90                         dchain->next = dma;
  91                 } else {
  92                         /* We're the first in line */
  93                         dma_chain = dma;
  94                 }
  95
  96                 dma->regs = sbus_ioremap(&dma->sdev->resource[0], 0,
  97                                          dma->sdev->resource[0].end - dma->sdev->resource[0].start + 1,
  98                                          "dma");
  99
 100                 dma->node = dma->sdev->prom_node;
 101
 102                 init_one_dvma(dma, num_dma++);
 103         }
 104 }
 105
 106 #ifdef CONFIG_SUN4
 107
 108 #include <asm/sun4paddr.h>
 109
 110 void __init sun4_dvma_init(void)
 111 {
 112         struct sbus_dma *dma;
 113         struct resource r;
 114
 115         if(sun4_dma_physaddr) {
 116                 dma = kmalloc(sizeof(struct sbus_dma), GFP_ATOMIC);
 117
 118                 /* No SBUS */
 119                 dma->sdev = NULL;
 120
 121                 /* Only one DMA device */
 122                 dma_chain = dma;
 123
 124                 memset(&r, 0, sizeof(r));
 125                 r.start = sun4_dma_physaddr;
 126                 dma->regs = sbus_ioremap(&r, 0, PAGE_SIZE, "dma");
 127
 128                 /* No prom node */
 129                 dma->node = 0x0;
 130
 131                 init_one_dvma(dma, 0);
 132         } else {
 133                 dma_chain = NULL;
 134         }
 135 }
 136
 137 #endif