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 DONT_USE_INTR
  18
  19 #define priv(host)                      ((struct NCR5380_hostdata *)(host)->hostdata)
  20
  21 #define NCR5380_read(reg) \
  22         readb(priv(instance)->base + ((reg) << 2))
  23 #define NCR5380_write(reg, value) \
  24         writeb(value, priv(instance)->base + ((reg) << 2))
  25
  26 #define NCR5380_dma_xfer_len(instance, cmd, phase)      (0)
  27 #define NCR5380_dma_recv_setup          oakscsi_pread
  28 #define NCR5380_dma_send_setup          oakscsi_pwrite
  29
  30 #define NCR5380_queue_command           oakscsi_queue_command
  31 #define NCR5380_info                    oakscsi_info
  32
  33 #define NCR5380_implementation_fields   \
  34         void __iomem *base
  35
  36 #include "../NCR5380.h"
  37
  38 #undef START_DMA_INITIATOR_RECEIVE_REG
  39 #define START_DMA_INITIATOR_RECEIVE_REG (128 + 7)
  40
  41 #define STAT    ((128 + 16) << 2)
  42 #define DATA    ((128 + 8) << 2)
  43
  44 static inline int oakscsi_pwrite(struct Scsi_Host *instance,
  45                                  unsigned char *addr, int len)
  46 {
  47   void __iomem *base = priv(instance)->base;
  48
  49 printk("writing %p len %d\n",addr, len);
  50
  51   while(1)
  52   {
  53     int status;
  54     while (((status = readw(base + STAT)) & 0x100)==0);
  55   }
  56   return 0;
  57 }
  58
  59 static inline int oakscsi_pread(struct Scsi_Host *instance,
  60                                 unsigned char *addr, int len)
  61 {
  62   void __iomem *base = priv(instance)->base;
  63 printk("reading %p len %d\n", addr, len);
  64   while(len > 0)
  65   {
  66     unsigned int status, timeout;
  67     unsigned long b;
  68
  69     timeout = 0x01FFFFFF;
  70
  71     while (((status = readw(base + STAT)) & 0x100)==0)
  72     {
  73       timeout--;
  74       if(status & 0x200 || !timeout)
  75       {
  76         printk("status = %08X\n", status);
  77         return -1;
  78       }
  79     }
  80
  81     if(len >= 128)
  82     {
  83       readsw(base + DATA, addr, 128);
  84       addr += 128;
  85       len -= 128;
  86     }
  87     else
  88     {
  89       b = (unsigned long) readw(base + DATA);
  90       *addr ++ = b;
  91       len -= 1;
  92       if(len)
  93         *addr ++ = b>>8;
  94       len -= 1;
  95     }
  96   }
  97   return 0;
  98 }
  99
 100 #undef STAT
 101 #undef DATA
 102
 103 #include "../NCR5380.c"
 104
 105 static struct scsi_host_template oakscsi_template = {
 106         .module                 = THIS_MODULE,
 107         .name                   = "Oak 16-bit SCSI",
 108         .info                   = oakscsi_info,
 109         .queuecommand           = oakscsi_queue_command,
 110         .eh_abort_handler       = NCR5380_abort,
 111         .eh_bus_reset_handler   = NCR5380_bus_reset,
 112         .can_queue              = 16,
 113         .this_id                = 7,
 114         .sg_tablesize           = SG_ALL,
 115         .cmd_per_lun            = 2,
 116         .use_clustering         = DISABLE_CLUSTERING,
 117         .proc_name              = "oakscsi",
 118         .cmd_size               = NCR5380_CMD_SIZE,
 119         .max_sectors            = 128,
 120 };
 121
 122 static int oakscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
 123 {
 124         struct Scsi_Host *host;
 125         int ret = -ENOMEM;
 126
 127         ret = ecard_request_resources(ec);
 128         if (ret)
 129                 goto out;
 130
 131         host = scsi_host_alloc(&oakscsi_template, sizeof(struct NCR5380_hostdata));
 132         if (!host) {
 133                 ret = -ENOMEM;
 134                 goto release;
 135         }
 136
 137         priv(host)->base = ioremap(ecard_resource_start(ec, ECARD_RES_MEMC),
 138                                    ecard_resource_len(ec, ECARD_RES_MEMC));
 139         if (!priv(host)->base) {
 140                 ret = -ENOMEM;
 141                 goto unreg;
 142         }
 143
 144         host->irq = NO_IRQ;
 145         host->n_io_port = 255;
 146
 147         ret = NCR5380_init(host, FLAG_DMA_FIXUP);
 148         if (ret)
 149                 goto out_unmap;
 150
 151         NCR5380_maybe_reset_bus(host);
 152
 153         ret = scsi_add_host(host, &ec->dev);
 154         if (ret)
 155                 goto out_exit;
 156
 157         scsi_scan_host(host);
 158         goto out;
 159
 160  out_exit:
 161         NCR5380_exit(host);
 162  out_unmap:
 163         iounmap(priv(host)->base);
 164  unreg:
 165         scsi_host_put(host);
 166  release:
 167         ecard_release_resources(ec);
 168  out:
 169         return ret;
 170 }
 171
 172 static void oakscsi_remove(struct expansion_card *ec)
 173 {
 174         struct Scsi_Host *host = ecard_get_drvdata(ec);
 175
 176         ecard_set_drvdata(ec, NULL);
 177         scsi_remove_host(host);
 178
 179         NCR5380_exit(host);
 180         iounmap(priv(host)->base);
 181         scsi_host_put(host);
 182         ecard_release_resources(ec);
 183 }
 184
 185 static const struct ecard_id oakscsi_cids[] = {
 186         { MANU_OAK, PROD_OAK_SCSI },
 187         { 0xffff, 0xffff }
 188 };
 189
 190 static struct ecard_driver oakscsi_driver = {
 191         .probe          = oakscsi_probe,
 192         .remove         = oakscsi_remove,
 193         .id_table       = oakscsi_cids,
 194         .drv = {
 195                 .name           = "oakscsi",
 196         },
 197 };
 198
 199 static int __init oakscsi_init(void)
 200 {
 201         return ecard_register_driver(&oakscsi_driver);
 202 }
 203
 204 static void __exit oakscsi_exit(void)
 205 {
 206         ecard_remove_driver(&oakscsi_driver);
 207 }
 208
 209 module_init(oakscsi_init);
 210 module_exit(oakscsi_exit);
 211
 212 MODULE_AUTHOR("Russell King");
 213 MODULE_DESCRIPTION("Oak SCSI driver");
 214 MODULE_LICENSE("GPL");
 215