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 #define NCR5380_dma_residual(instance)  (0)
  30
  31 #define NCR5380_queue_command           oakscsi_queue_command
  32 #define NCR5380_info                    oakscsi_info
  33
  34 #define NCR5380_implementation_fields   \
  35         void __iomem *base
  36
  37 #include "../NCR5380.h"
  38
  39 #undef START_DMA_INITIATOR_RECEIVE_REG
  40 #define START_DMA_INITIATOR_RECEIVE_REG (128 + 7)
  41
  42 #define STAT    ((128 + 16) << 2)
  43 #define DATA    ((128 + 8) << 2)
  44
  45 static inline int oakscsi_pwrite(struct Scsi_Host *instance,
  46                                  unsigned char *addr, int len)
  47 {
  48   void __iomem *base = priv(instance)->base;
  49
  50 printk("writing %p len %d\n",addr, len);
  51
  52   while(1)
  53   {
  54     int status;
  55     while (((status = readw(base + STAT)) & 0x100)==0);
  56   }
  57   return 0;
  58 }
  59
  60 static inline int oakscsi_pread(struct Scsi_Host *instance,
  61                                 unsigned char *addr, int len)
  62 {
  63   void __iomem *base = priv(instance)->base;
  64 printk("reading %p len %d\n", addr, len);
  65   while(len > 0)
  66   {
  67     unsigned int status, timeout;
  68     unsigned long b;
  69
  70     timeout = 0x01FFFFFF;
  71
  72     while (((status = readw(base + STAT)) & 0x100)==0)
  73     {
  74       timeout--;
  75       if(status & 0x200 || !timeout)
  76       {
  77         printk("status = %08X\n", status);
  78         return -1;
  79       }
  80     }
  81
  82     if(len >= 128)
  83     {
  84       readsw(base + DATA, addr, 128);
  85       addr += 128;
  86       len -= 128;
  87     }
  88     else
  89     {
  90       b = (unsigned long) readw(base + DATA);
  91       *addr ++ = b;
  92       len -= 1;
  93       if(len)
  94         *addr ++ = b>>8;
  95       len -= 1;
  96     }
  97   }
  98   return 0;
  99 }
 100
 101 #undef STAT
 102 #undef DATA
 103
 104 #include "../NCR5380.c"
 105
 106 static struct scsi_host_template oakscsi_template = {
 107         .module                 = THIS_MODULE,
 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         .cmd_size               = NCR5380_CMD_SIZE,
 120         .max_sectors            = 128,
 121 };
 122
 123 static int oakscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
 124 {
 125         struct Scsi_Host *host;
 126         int ret = -ENOMEM;
 127
 128         ret = ecard_request_resources(ec);
 129         if (ret)
 130                 goto out;
 131
 132         host = scsi_host_alloc(&oakscsi_template, sizeof(struct NCR5380_hostdata));
 133         if (!host) {
 134                 ret = -ENOMEM;
 135                 goto release;
 136         }
 137
 138         priv(host)->base = ioremap(ecard_resource_start(ec, ECARD_RES_MEMC),
 139                                    ecard_resource_len(ec, ECARD_RES_MEMC));
 140         if (!priv(host)->base) {
 141                 ret = -ENOMEM;
 142                 goto unreg;
 143         }
 144
 145         host->irq = NO_IRQ;
 146         host->n_io_port = 255;
 147
 148         ret = NCR5380_init(host, FLAG_DMA_FIXUP | FLAG_LATE_DMA_SETUP);
 149         if (ret)
 150                 goto out_unmap;
 151
 152         NCR5380_maybe_reset_bus(host);
 153
 154         ret = scsi_add_host(host, &ec->dev);
 155         if (ret)
 156                 goto out_exit;
 157
 158         scsi_scan_host(host);
 159         goto out;
 160
 161  out_exit:
 162         NCR5380_exit(host);
 163  out_unmap:
 164         iounmap(priv(host)->base);
 165  unreg:
 166         scsi_host_put(host);
 167  release:
 168         ecard_release_resources(ec);
 169  out:
 170         return ret;
 171 }
 172
 173 static void oakscsi_remove(struct expansion_card *ec)
 174 {
 175         struct Scsi_Host *host = ecard_get_drvdata(ec);
 176
 177         ecard_set_drvdata(ec, NULL);
 178         scsi_remove_host(host);
 179
 180         NCR5380_exit(host);
 181         iounmap(priv(host)->base);
 182         scsi_host_put(host);
 183         ecard_release_resources(ec);
 184 }
 185
 186 static const struct ecard_id oakscsi_cids[] = {
 187         { MANU_OAK, PROD_OAK_SCSI },
 188         { 0xffff, 0xffff }
 189 };
 190
 191 static struct ecard_driver oakscsi_driver = {
 192         .probe          = oakscsi_probe,
 193         .remove         = oakscsi_remove,
 194         .id_table       = oakscsi_cids,
 195         .drv = {
 196                 .name           = "oakscsi",
 197         },
 198 };
 199
 200 static int __init oakscsi_init(void)
 201 {
 202         return ecard_register_driver(&oakscsi_driver);
 203 }
 204
 205 static void __exit oakscsi_exit(void)
 206 {
 207         ecard_remove_driver(&oakscsi_driver);
 208 }
 209
 210 module_init(oakscsi_init);
 211 module_exit(oakscsi_exit);
 212
 213 MODULE_AUTHOR("Russell King");
 214 MODULE_DESCRIPTION("Oak SCSI driver");
 215 MODULE_LICENSE("GPL");
 216