drivers/scsi/arm/oak.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Oak Generic NCR5380 driver
   4  *
   5  * Copyright 1995-2002, Russell King
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/ioport.h>
  10 #include <linux/blkdev.h>
  11 #include <linux/init.h>
  12
  13 #include <asm/ecard.h>
  14 #include <asm/io.h>
  15
  16 #include <scsi/scsi_host.h>
  17
  18 #define priv(host)                      ((struct NCR5380_hostdata *)(host)->hostdata)
  19
  20 #define NCR5380_read(reg)           readb(hostdata->io + ((reg) << 2))
  21 #define NCR5380_write(reg, value)   writeb(value, hostdata->io + ((reg) << 2))
  22
  23 #define NCR5380_dma_xfer_len            NCR5380_dma_xfer_none
  24 #define NCR5380_dma_recv_setup          oakscsi_pread
  25 #define NCR5380_dma_send_setup          oakscsi_pwrite
  26 #define NCR5380_dma_residual            NCR5380_dma_residual_none
  27
  28 #define NCR5380_queue_command           oakscsi_queue_command
  29 #define NCR5380_info                    oakscsi_info
  30
  31 #define NCR5380_implementation_fields   /* none */
  32
  33 #include "../NCR5380.h"
  34
  35 #undef START_DMA_INITIATOR_RECEIVE_REG
  36 #define START_DMA_INITIATOR_RECEIVE_REG (128 + 7)
  37
  38 #define STAT    ((128 + 16) << 2)
  39 #define DATA    ((128 + 8) << 2)
  40
  41 static inline int oakscsi_pwrite(struct NCR5380_hostdata *hostdata,
  42                                  unsigned char *addr, int len)
  43 {
  44   u8 __iomem *base = hostdata->io;
  45
  46 printk("writing %p len %d\n",addr, len);
  47
  48   while(1)
  49   {
  50     int status;
  51     while (((status = readw(base + STAT)) & 0x100)==0);
  52   }
  53   return 0;
  54 }
  55
  56 static inline int oakscsi_pread(struct NCR5380_hostdata *hostdata,
  57                                 unsigned char *addr, int len)
  58 {
  59   u8 __iomem *base = hostdata->io;
  60
  61 printk("reading %p len %d\n", addr, len);
  62   while(len > 0)
  63   {
  64     unsigned int status, timeout;
  65     unsigned long b;
  66
  67     timeout = 0x01FFFFFF;
  68
  69     while (((status = readw(base + STAT)) & 0x100)==0)
  70     {
  71       timeout--;
  72       if(status & 0x200 || !timeout)
  73       {
  74         printk("status = %08X\n", status);
  75         return -1;
  76       }
  77     }
  78
  79     if(len >= 128)
  80     {
  81       readsw(base + DATA, addr, 128);
  82       addr += 128;
  83       len -= 128;
  84     }
  85     else
  86     {
  87       b = (unsigned long) readw(base + DATA);
  88       *addr ++ = b;
  89       len -= 1;
  90       if(len)
  91         *addr ++ = b>>8;
  92       len -= 1;
  93     }
  94   }
  95   return 0;
  96 }
  97
  98 #undef STAT
  99 #undef DATA
 100
 101 #include "../NCR5380.c"
 102
 103 static struct scsi_host_template oakscsi_template = {
 104         .module                 = THIS_MODULE,
 105         .name                   = "Oak 16-bit SCSI",
 106         .info                   = oakscsi_info,
 107         .queuecommand           = oakscsi_queue_command,
 108         .eh_abort_handler       = NCR5380_abort,
 109         .eh_host_reset_handler  = NCR5380_host_reset,
 110         .can_queue              = 16,
 111         .this_id                = 7,
 112         .sg_tablesize           = SG_ALL,
 113         .cmd_per_lun            = 2,
 114         .dma_boundary           = PAGE_SIZE - 1,
 115         .proc_name              = "oakscsi",
 116         .cmd_size               = NCR5380_CMD_SIZE,
 117         .max_sectors            = 128,
 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;
 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)->io = ioremap(ecard_resource_start(ec, ECARD_RES_MEMC),
 136                                  ecard_resource_len(ec, ECARD_RES_MEMC));
 137         if (!priv(host)->io) {
 138                 ret = -ENOMEM;
 139                 goto unreg;
 140         }
 141
 142         host->irq = NO_IRQ;
 143
 144         ret = NCR5380_init(host, FLAG_DMA_FIXUP | FLAG_LATE_DMA_SETUP);
 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)->io);
 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         void __iomem *base = priv(host)->io;
 173
 174         ecard_set_drvdata(ec, NULL);
 175         scsi_remove_host(host);
 176
 177         NCR5380_exit(host);
 178         scsi_host_put(host);
 179         iounmap(base);
 180         ecard_release_resources(ec);
 181 }
 182
 183 static const struct ecard_id oakscsi_cids[] = {
 184         { MANU_OAK, PROD_OAK_SCSI },
 185         { 0xffff, 0xffff }
 186 };
 187
 188 static struct ecard_driver oakscsi_driver = {
 189         .probe          = oakscsi_probe,
 190         .remove         = oakscsi_remove,
 191         .id_table       = oakscsi_cids,
 192         .drv = {
 193                 .name           = "oakscsi",
 194         },
 195 };
 196
 197 static int __init oakscsi_init(void)
 198 {
 199         return ecard_register_driver(&oakscsi_driver);
 200 }
 201
 202 static void __exit oakscsi_exit(void)
 203 {
 204         ecard_remove_driver(&oakscsi_driver);
 205 }
 206
 207 module_init(oakscsi_init);
 208 module_exit(oakscsi_exit);
 209
 210 MODULE_AUTHOR("Russell King");
 211 MODULE_DESCRIPTION("Oak SCSI driver");
 212 MODULE_LICENSE("GPL");
 213