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 PSEUDO_DMA*/
  18 #define DONT_USE_INTR
  19
  20 #define priv(host)                      ((struct NCR5380_hostdata *)(host)->hostdata)
  21
  22 #define NCR5380_read(reg) \
  23         readb(priv(instance)->base + ((reg) << 2))
  24 #define NCR5380_write(reg, value) \
  25         writeb(value, priv(instance)->base + ((reg) << 2))
  26
  27 #define NCR5380_dma_xfer_len(instance, cmd, phase)      (cmd->transfersize)
  28
  29 #define NCR5380_queue_command           oakscsi_queue_command
  30 #define NCR5380_info                    oakscsi_info
  31
  32 #define NCR5380_implementation_fields   \
  33         void __iomem *base
  34
  35 #include "../NCR5380.h"
  36
  37 #undef START_DMA_INITIATOR_RECEIVE_REG
  38 #define START_DMA_INITIATOR_RECEIVE_REG (128 + 7)
  39
  40 #define STAT    ((128 + 16) << 2)
  41 #define DATA    ((128 + 8) << 2)
  42
  43 static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *addr,
  44               int len)
  45 {
  46   void __iomem *base = priv(instance)->base;
  47
  48 printk("writing %p len %d\n",addr, len);
  49   if(!len) return -1;
  50
  51   while(1)
  52   {
  53     int status;
  54     while (((status = readw(base + STAT)) & 0x100)==0);
  55   }
  56 }
  57
  58 static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *addr,
  59               int len)
  60 {
  61   void __iomem *base = priv(instance)->base;
  62 printk("reading %p len %d\n", addr, len);
  63   while(len > 0)
  64   {
  65     unsigned int status, timeout;
  66     unsigned long b;
  67
  68     timeout = 0x01FFFFFF;
  69
  70     while (((status = readw(base + STAT)) & 0x100)==0)
  71     {
  72       timeout--;
  73       if(status & 0x200 || !timeout)
  74       {
  75         printk("status = %08X\n", status);
  76         return 1;
  77       }
  78     }
  79
  80     if(len >= 128)
  81     {
  82       readsw(base + DATA, addr, 128);
  83       addr += 128;
  84       len -= 128;
  85     }
  86     else
  87     {
  88       b = (unsigned long) readw(base + DATA);
  89       *addr ++ = b;
  90       len -= 1;
  91       if(len)
  92         *addr ++ = b>>8;
  93       len -= 1;
  94     }
  95   }
  96   return 0;
  97 }
  98
  99 #undef STAT
 100 #undef DATA
 101
 102 #include "../NCR5380.c"
 103
 104 static struct scsi_host_template oakscsi_template = {
 105         .module                 = THIS_MODULE,
 106         .name                   = "Oak 16-bit SCSI",
 107         .info                   = oakscsi_info,
 108         .queuecommand           = oakscsi_queue_command,
 109         .eh_abort_handler       = NCR5380_abort,
 110         .eh_bus_reset_handler   = NCR5380_bus_reset,
 111         .can_queue              = 16,
 112         .this_id                = 7,
 113         .sg_tablesize           = SG_ALL,
 114         .cmd_per_lun            = 2,
 115         .use_clustering         = DISABLE_CLUSTERING,
 116         .proc_name              = "oakscsi",
 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)->base = ioremap(ecard_resource_start(ec, ECARD_RES_MEMC),
 135                                    ecard_resource_len(ec, ECARD_RES_MEMC));
 136         if (!priv(host)->base) {
 137                 ret = -ENOMEM;
 138                 goto unreg;
 139         }
 140
 141         host->irq = NO_IRQ;
 142         host->n_io_port = 255;
 143
 144         ret = NCR5380_init(host, 0);
 145         if (ret)
 146                 goto out_unmap;
 147
 148         NCR5380_maybe_reset_bus(host);
 149
 150         ret = scsi_add_host(host, &ec->dev);
 151         if (ret)
 152                 goto out_exit;
 153
 154         scsi_scan_host(host);
 155         goto out;
 156
 157  out_exit:
 158         NCR5380_exit(host);
 159  out_unmap:
 160         iounmap(priv(host)->base);
 161  unreg:
 162         scsi_host_put(host);
 163  release:
 164         ecard_release_resources(ec);
 165  out:
 166         return ret;
 167 }
 168
 169 static void oakscsi_remove(struct expansion_card *ec)
 170 {
 171         struct Scsi_Host *host = ecard_get_drvdata(ec);
 172
 173         ecard_set_drvdata(ec, NULL);
 174         scsi_remove_host(host);
 175
 176         NCR5380_exit(host);
 177         iounmap(priv(host)->base);
 178         scsi_host_put(host);
 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