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 #define NCR5380_local_declare()         void __iomem *_base
  24 #define NCR5380_setup(host)             _base = priv(host)->base
  25
  26 #define NCR5380_read(reg)               readb(_base + ((reg) << 2))
  27 #define NCR5380_write(reg, value)       writeb(value, _base + ((reg) << 2))
  28 #define NCR5380_queue_command           oakscsi_queue_command
  29 #define NCR5380_info                    oakscsi_info
  30 #define NCR5380_show_info               oakscsi_show_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         .show_info              = oakscsi_show_info,
 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 };
 119
 120 static int oakscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
 121 {
 122         struct Scsi_Host *host;
 123         int ret = -ENOMEM;
 124
 125         ret = ecard_request_resources(ec);
 126         if (ret)
 127                 goto out;
 128
 129         host = scsi_host_alloc(&oakscsi_template, sizeof(struct NCR5380_hostdata));
 130         if (!host) {
 131                 ret = -ENOMEM;
 132                 goto release;
 133         }
 134
 135         priv(host)->base = ioremap(ecard_resource_start(ec, ECARD_RES_MEMC),
 136                                    ecard_resource_len(ec, ECARD_RES_MEMC));
 137         if (!priv(host)->base) {
 138                 ret = -ENOMEM;
 139                 goto unreg;
 140         }
 141
 142         host->irq = NO_IRQ;
 143         host->n_io_port = 255;
 144
 145         NCR5380_init(host, 0);
 146
 147         ret = scsi_add_host(host, &ec->dev);
 148         if (ret)
 149                 goto out_unmap;
 150
 151         scsi_scan_host(host);
 152         goto out;
 153
 154  out_unmap:
 155         iounmap(priv(host)->base);
 156  unreg:
 157         scsi_host_put(host);
 158  release:
 159         ecard_release_resources(ec);
 160  out:
 161         return ret;
 162 }
 163
 164 static void oakscsi_remove(struct expansion_card *ec)
 165 {
 166         struct Scsi_Host *host = ecard_get_drvdata(ec);
 167
 168         ecard_set_drvdata(ec, NULL);
 169         scsi_remove_host(host);
 170
 171         NCR5380_exit(host);
 172         iounmap(priv(host)->base);
 173         scsi_host_put(host);
 174         ecard_release_resources(ec);
 175 }
 176
 177 static const struct ecard_id oakscsi_cids[] = {
 178         { MANU_OAK, PROD_OAK_SCSI },
 179         { 0xffff, 0xffff }
 180 };
 181
 182 static struct ecard_driver oakscsi_driver = {
 183         .probe          = oakscsi_probe,
 184         .remove         = oakscsi_remove,
 185         .id_table       = oakscsi_cids,
 186         .drv = {
 187                 .name           = "oakscsi",
 188         },
 189 };
 190
 191 static int __init oakscsi_init(void)
 192 {
 193         return ecard_register_driver(&oakscsi_driver);
 194 }
 195
 196 static void __exit oakscsi_exit(void)
 197 {
 198         ecard_remove_driver(&oakscsi_driver);
 199 }
 200
 201 module_init(oakscsi_init);
 202 module_exit(oakscsi_exit);
 203
 204 MODULE_AUTHOR("Russell King");
 205 MODULE_DESCRIPTION("Oak SCSI driver");
 206 MODULE_LICENSE("GPL");
 207