drivers/scsi/arm/oak.c

   1 /*
   2  * Oak Generic NCR5380 driver
   3  *
   4  * Copyright 1995-2002, Russell King
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/ioport.h>
   9 #include <linux/blkdev.h>
  10 #include <linux/init.h>
  11
  12 #include <asm/ecard.h>
  13 #include <asm/io.h>
  14
  15 #include <scsi/scsi_host.h>
  16
  17 #define priv(host)                      ((struct NCR5380_hostdata *)(host)->hostdata)
  18
  19 #define NCR5380_read(reg)           readb(hostdata->io + ((reg) << 2))
  20 #define NCR5380_write(reg, value)   writeb(value, hostdata->io + ((reg) << 2))
  21
  22 #define NCR5380_dma_xfer_len            NCR5380_dma_xfer_none
  23 #define NCR5380_dma_recv_setup          oakscsi_pread
  24 #define NCR5380_dma_send_setup          oakscsi_pwrite
  25 #define NCR5380_dma_residual            NCR5380_dma_residual_none
  26
  27 #define NCR5380_queue_command           oakscsi_queue_command
  28 #define NCR5380_info                    oakscsi_info
  29
  30 #define NCR5380_implementation_fields   /* none */
  31
  32 #include "../NCR5380.h"
  33
  34 #undef START_DMA_INITIATOR_RECEIVE_REG
  35 #define START_DMA_INITIATOR_RECEIVE_REG (128 + 7)
  36
  37 #define STAT    ((128 + 16) << 2)
  38 #define DATA    ((128 + 8) << 2)
  39
  40 static inline int oakscsi_pwrite(struct NCR5380_hostdata *hostdata,
  41                                  unsigned char *addr, int len)
  42 {
  43   u8 __iomem *base = hostdata->io;
  44
  45 printk("writing %p len %d\n",addr, len);
  46
  47   while(1)
  48   {
  49     int status;
  50     while (((status = readw(base + STAT)) & 0x100)==0);
  51   }
  52   return 0;
  53 }
  54
  55 static inline int oakscsi_pread(struct NCR5380_hostdata *hostdata,
  56                                 unsigned char *addr, int len)
  57 {
  58   u8 __iomem *base = hostdata->io;
  59
  60 printk("reading %p len %d\n", addr, len);
  61   while(len > 0)
  62   {
  63     unsigned int status, timeout;
  64     unsigned long b;
  65
  66     timeout = 0x01FFFFFF;
  67
  68     while (((status = readw(base + STAT)) & 0x100)==0)
  69     {
  70       timeout--;
  71       if(status & 0x200 || !timeout)
  72       {
  73         printk("status = %08X\n", status);
  74         return -1;
  75       }
  76     }
  77
  78     if(len >= 128)
  79     {
  80       readsw(base + DATA, addr, 128);
  81       addr += 128;
  82       len -= 128;
  83     }
  84     else
  85     {
  86       b = (unsigned long) readw(base + DATA);
  87       *addr ++ = b;
  88       len -= 1;
  89       if(len)
  90         *addr ++ = b>>8;
  91       len -= 1;
  92     }
  93   }
  94   return 0;
  95 }
  96
  97 #undef STAT
  98 #undef DATA
  99
 100 #include "../NCR5380.c"
 101
 102 static struct scsi_host_template oakscsi_template = {
 103         .module                 = THIS_MODULE,
 104         .name                   = "Oak 16-bit SCSI",
 105         .info                   = oakscsi_info,
 106         .queuecommand           = oakscsi_queue_command,
 107         .eh_abort_handler       = NCR5380_abort,
 108         .eh_host_reset_handler  = NCR5380_host_reset,
 109         .can_queue              = 16,
 110         .this_id                = 7,
 111         .sg_tablesize           = SG_ALL,
 112         .cmd_per_lun            = 2,
 113         .dma_boundary           = PAGE_SIZE - 1,
 114         .proc_name              = "oakscsi",
 115         .cmd_size               = NCR5380_CMD_SIZE,
 116         .max_sectors            = 128,
 117 };
 118
 119 static int oakscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
 120 {
 121         struct Scsi_Host *host;
 122         int ret = -ENOMEM;
 123
 124         ret = ecard_request_resources(ec);
 125         if (ret)
 126                 goto out;
 127
 128         host = scsi_host_alloc(&oakscsi_template, sizeof(struct NCR5380_hostdata));
 129         if (!host) {
 130                 ret = -ENOMEM;
 131                 goto release;
 132         }
 133
 134         priv(host)->io = ioremap(ecard_resource_start(ec, ECARD_RES_MEMC),
 135                                  ecard_resource_len(ec, ECARD_RES_MEMC));
 136         if (!priv(host)->io) {
 137                 ret = -ENOMEM;
 138                 goto unreg;
 139         }
 140
 141         host->irq = NO_IRQ;
 142
 143         ret = NCR5380_init(host, FLAG_DMA_FIXUP | FLAG_LATE_DMA_SETUP);
 144         if (ret)
 145                 goto out_unmap;
 146
 147         NCR5380_maybe_reset_bus(host);
 148
 149         ret = scsi_add_host(host, &ec->dev);
 150         if (ret)
 151                 goto out_exit;
 152
 153         scsi_scan_host(host);
 154         goto out;
 155
 156  out_exit:
 157         NCR5380_exit(host);
 158  out_unmap:
 159         iounmap(priv(host)->io);
 160  unreg:
 161         scsi_host_put(host);
 162  release:
 163         ecard_release_resources(ec);
 164  out:
 165         return ret;
 166 }
 167
 168 static void oakscsi_remove(struct expansion_card *ec)
 169 {
 170         struct Scsi_Host *host = ecard_get_drvdata(ec);
 171         void __iomem *base = priv(host)->io;
 172
 173         ecard_set_drvdata(ec, NULL);
 174         scsi_remove_host(host);
 175
 176         NCR5380_exit(host);
 177         scsi_host_put(host);
 178         iounmap(base);
 179         ecard_release_resources(ec);
 180 }
 181
 182 static const struct ecard_id oakscsi_cids[] = {
 183         { MANU_OAK, PROD_OAK_SCSI },
 184         { 0xffff, 0xffff }
 185 };
 186
 187 static struct ecard_driver oakscsi_driver = {
 188         .probe          = oakscsi_probe,
 189         .remove         = oakscsi_remove,
 190         .id_table       = oakscsi_cids,
 191         .drv = {
 192                 .name           = "oakscsi",
 193         },
 194 };
 195
 196 static int __init oakscsi_init(void)
 197 {
 198         return ecard_register_driver(&oakscsi_driver);
 199 }
 200
 201 static void __exit oakscsi_exit(void)
 202 {
 203         ecard_remove_driver(&oakscsi_driver);
 204 }
 205
 206 module_init(oakscsi_init);
 207 module_exit(oakscsi_exit);
 208
 209 MODULE_AUTHOR("Russell King");
 210 MODULE_DESCRIPTION("Oak SCSI driver");
 211 MODULE_LICENSE("GPL");
 212