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/signal.h>
   9 #include <linux/ioport.h>
  10 #include <linux/delay.h>
  11 #include <linux/blkdev.h>
  12 #include <linux/init.h>
  13
  14 #include <asm/ecard.h>
  15 #include <asm/io.h>
  16
  17 #include <scsi/scsi_host.h>
  18
  19 /*#define PSEUDO_DMA*/
  20 #define DONT_USE_INTR
  21
  22 #define priv(host)                      ((struct NCR5380_hostdata *)(host)->hostdata)
  23
  24 #define NCR5380_read(reg) \
  25         readb(priv(instance)->base + ((reg) << 2))
  26 #define NCR5380_write(reg, value) \
  27         writeb(value, priv(instance)->base + ((reg) << 2))
  28
  29 #define NCR5380_queue_command           oakscsi_queue_command
  30 #define NCR5380_info                    oakscsi_info
  31 #define NCR5380_show_info               oakscsi_show_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 NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *addr,
  45               int len)
  46 {
  47   void __iomem *base = priv(instance)->base;
  48
  49 printk("writing %p len %d\n",addr, len);
  50   if(!len) return -1;
  51
  52   while(1)
  53   {
  54     int status;
  55     while (((status = readw(base + STAT)) & 0x100)==0);
  56   }
  57 }
  58
  59 static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *addr,
  60               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         .show_info              = oakscsi_show_info,
 108         .name                   = "Oak 16-bit SCSI",
 109         .info                   = oakscsi_info,
 110         .queuecommand           = oakscsi_queue_command,
 111         .eh_abort_handler       = NCR5380_abort,
 112         .eh_bus_reset_handler   = NCR5380_bus_reset,
 113         .can_queue              = 16,
 114         .this_id                = 7,
 115         .sg_tablesize           = SG_ALL,
 116         .cmd_per_lun            = 2,
 117         .use_clustering         = DISABLE_CLUSTERING,
 118         .proc_name              = "oakscsi",
 119 };
 120
 121 static int oakscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
 122 {
 123         struct Scsi_Host *host;
 124         int ret = -ENOMEM;
 125
 126         ret = ecard_request_resources(ec);
 127         if (ret)
 128                 goto out;
 129
 130         host = scsi_host_alloc(&oakscsi_template, sizeof(struct NCR5380_hostdata));
 131         if (!host) {
 132                 ret = -ENOMEM;
 133                 goto release;
 134         }
 135
 136         priv(host)->base = ioremap(ecard_resource_start(ec, ECARD_RES_MEMC),
 137                                    ecard_resource_len(ec, ECARD_RES_MEMC));
 138         if (!priv(host)->base) {
 139                 ret = -ENOMEM;
 140                 goto unreg;
 141         }
 142
 143         host->irq = NO_IRQ;
 144         host->n_io_port = 255;
 145
 146         NCR5380_init(host, 0);
 147
 148         ret = scsi_add_host(host, &ec->dev);
 149         if (ret)
 150                 goto out_unmap;
 151
 152         scsi_scan_host(host);
 153         goto out;
 154
 155  out_unmap:
 156         iounmap(priv(host)->base);
 157  unreg:
 158         scsi_host_put(host);
 159  release:
 160         ecard_release_resources(ec);
 161  out:
 162         return ret;
 163 }
 164
 165 static void oakscsi_remove(struct expansion_card *ec)
 166 {
 167         struct Scsi_Host *host = ecard_get_drvdata(ec);
 168
 169         ecard_set_drvdata(ec, NULL);
 170         scsi_remove_host(host);
 171
 172         NCR5380_exit(host);
 173         iounmap(priv(host)->base);
 174         scsi_host_put(host);
 175         ecard_release_resources(ec);
 176 }
 177
 178 static const struct ecard_id oakscsi_cids[] = {
 179         { MANU_OAK, PROD_OAK_SCSI },
 180         { 0xffff, 0xffff }
 181 };
 182
 183 static struct ecard_driver oakscsi_driver = {
 184         .probe          = oakscsi_probe,
 185         .remove         = oakscsi_remove,
 186         .id_table       = oakscsi_cids,
 187         .drv = {
 188                 .name           = "oakscsi",
 189         },
 190 };
 191
 192 static int __init oakscsi_init(void)
 193 {
 194         return ecard_register_driver(&oakscsi_driver);
 195 }
 196
 197 static void __exit oakscsi_exit(void)
 198 {
 199         ecard_remove_driver(&oakscsi_driver);
 200 }
 201
 202 module_init(oakscsi_init);
 203 module_exit(oakscsi_exit);
 204
 205 MODULE_AUTHOR("Russell King");
 206 MODULE_DESCRIPTION("Oak SCSI driver");
 207 MODULE_LICENSE("GPL");
 208