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.h"
  18 #include <scsi/scsi_host.h>
  19
  20 #define AUTOSENSE
  21 /*#define PSEUDO_DMA*/
  22
  23 #define OAKSCSI_PUBLIC_RELEASE 1
  24 #define DONT_USE_INTR
  25
  26 #define priv(host)                      ((struct NCR5380_hostdata *)(host)->hostdata)
  27 #define NCR5380_local_declare()         void __iomem *_base
  28 #define NCR5380_setup(host)             _base = priv(host)->base
  29
  30 #define NCR5380_read(reg)               readb(_base + ((reg) << 2))
  31 #define NCR5380_write(reg, value)       writeb(value, _base + ((reg) << 2))
  32 #define NCR5380_intr                    oakscsi_intr
  33 #define NCR5380_queue_command           oakscsi_queue_command
  34 #define NCR5380_show_info               oakscsi_show_info
  35 #define NCR5380_write_info              oakscsi_write_info
  36
  37 #define NCR5380_implementation_fields   \
  38         void __iomem *base
  39
  40 #include "../NCR5380.h"
  41
  42 #undef START_DMA_INITIATOR_RECEIVE_REG
  43 #define START_DMA_INITIATOR_RECEIVE_REG (128 + 7)
  44
  45 const char * oakscsi_info (struct Scsi_Host *spnt)
  46 {
  47         return "";
  48 }
  49
  50 #define STAT    ((128 + 16) << 2)
  51 #define DATA    ((128 + 8) << 2)
  52
  53 static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *addr,
  54               int len)
  55 {
  56   void __iomem *base = priv(instance)->base;
  57
  58 printk("writing %p len %d\n",addr, len);
  59   if(!len) return -1;
  60
  61   while(1)
  62   {
  63     int status;
  64     while (((status = readw(base + STAT)) & 0x100)==0);
  65   }
  66 }
  67
  68 static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *addr,
  69               int len)
  70 {
  71   void __iomem *base = priv(instance)->base;
  72 printk("reading %p len %d\n", addr, len);
  73   while(len > 0)
  74   {
  75     unsigned int status, timeout;
  76     unsigned long b;
  77
  78     timeout = 0x01FFFFFF;
  79
  80     while (((status = readw(base + STAT)) & 0x100)==0)
  81     {
  82       timeout--;
  83       if(status & 0x200 || !timeout)
  84       {
  85         printk("status = %08X\n", status);
  86         return 1;
  87       }
  88     }
  89
  90     if(len >= 128)
  91     {
  92       readsw(base + DATA, addr, 128);
  93       addr += 128;
  94       len -= 128;
  95     }
  96     else
  97     {
  98       b = (unsigned long) readw(base + DATA);
  99       *addr ++ = b;
 100       len -= 1;
 101       if(len)
 102         *addr ++ = b>>8;
 103       len -= 1;
 104     }
 105   }
 106   return 0;
 107 }
 108
 109 #undef STAT
 110 #undef DATA
 111
 112 #include "../NCR5380.c"
 113
 114 static struct scsi_host_template oakscsi_template = {
 115         .module                 = THIS_MODULE,
 116         .show_info              = oakscsi_show_info,
 117         .write_info             = oakscsi_write_info,
 118         .name                   = "Oak 16-bit SCSI",
 119         .info                   = oakscsi_info,
 120         .queuecommand           = oakscsi_queue_command,
 121         .eh_abort_handler       = NCR5380_abort,
 122         .eh_bus_reset_handler   = NCR5380_bus_reset,
 123         .can_queue              = 16,
 124         .this_id                = 7,
 125         .sg_tablesize           = SG_ALL,
 126         .cmd_per_lun            = 2,
 127         .use_clustering         = DISABLE_CLUSTERING,
 128         .proc_name              = "oakscsi",
 129 };
 130
 131 static int oakscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
 132 {
 133         struct Scsi_Host *host;
 134         int ret = -ENOMEM;
 135
 136         ret = ecard_request_resources(ec);
 137         if (ret)
 138                 goto out;
 139
 140         host = scsi_host_alloc(&oakscsi_template, sizeof(struct NCR5380_hostdata));
 141         if (!host) {
 142                 ret = -ENOMEM;
 143                 goto release;
 144         }
 145
 146         priv(host)->base = ioremap(ecard_resource_start(ec, ECARD_RES_MEMC),
 147                                    ecard_resource_len(ec, ECARD_RES_MEMC));
 148         if (!priv(host)->base) {
 149                 ret = -ENOMEM;
 150                 goto unreg;
 151         }
 152
 153         host->irq = IRQ_NONE;
 154         host->n_io_port = 255;
 155
 156         NCR5380_init(host, 0);
 157
 158         printk("scsi%d: at port 0x%08lx irqs disabled",
 159                 host->host_no, host->io_port);
 160         printk(" options CAN_QUEUE=%d  CMD_PER_LUN=%d release=%d",
 161                 host->can_queue, host->cmd_per_lun, OAKSCSI_PUBLIC_RELEASE);
 162         printk("\nscsi%d:", host->host_no);
 163         NCR5380_print_options(host);
 164         printk("\n");
 165
 166         ret = scsi_add_host(host, &ec->dev);
 167         if (ret)
 168                 goto out_unmap;
 169
 170         scsi_scan_host(host);
 171         goto out;
 172
 173  out_unmap:
 174         iounmap(priv(host)->base);
 175  unreg:
 176         scsi_host_put(host);
 177  release:
 178         ecard_release_resources(ec);
 179  out:
 180         return ret;
 181 }
 182
 183 static void oakscsi_remove(struct expansion_card *ec)
 184 {
 185         struct Scsi_Host *host = ecard_get_drvdata(ec);
 186
 187         ecard_set_drvdata(ec, NULL);
 188         scsi_remove_host(host);
 189
 190         NCR5380_exit(host);
 191         iounmap(priv(host)->base);
 192         scsi_host_put(host);
 193         ecard_release_resources(ec);
 194 }
 195
 196 static const struct ecard_id oakscsi_cids[] = {
 197         { MANU_OAK, PROD_OAK_SCSI },
 198         { 0xffff, 0xffff }
 199 };
 200
 201 static struct ecard_driver oakscsi_driver = {
 202         .probe          = oakscsi_probe,
 203         .remove         = oakscsi_remove,
 204         .id_table       = oakscsi_cids,
 205         .drv = {
 206                 .name           = "oakscsi",
 207         },
 208 };
 209
 210 static int __init oakscsi_init(void)
 211 {
 212         return ecard_register_driver(&oakscsi_driver);
 213 }
 214
 215 static void __exit oakscsi_exit(void)
 216 {
 217         ecard_remove_driver(&oakscsi_driver);
 218 }
 219
 220 module_init(oakscsi_init);
 221 module_exit(oakscsi_exit);
 222
 223 MODULE_AUTHOR("Russell King");
 224 MODULE_DESCRIPTION("Oak SCSI driver");
 225 MODULE_LICENSE("GPL");
 226