drivers/scsi/arm/ecoscsi.c

   1 #define AUTOSENSE
   2 /* #define PSEUDO_DMA */
   3
   4 /*
   5  * EcoSCSI Generic NCR5380 driver
   6  *
   7  * Copyright 1995, Russell King
   8  *
   9  * ALPHA RELEASE 1.
  10  *
  11  * For more information, please consult
  12  *
  13  * NCR 5380 Family
  14  * SCSI Protocol Controller
  15  * Databook
  16  *
  17  * NCR Microelectronics
  18  * 1635 Aeroplaza Drive
  19  * Colorado Springs, CO 80916
  20  * 1+ (719) 578-3400
  21  * 1+ (800) 334-5454
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/signal.h>
  26 #include <linux/ioport.h>
  27 #include <linux/delay.h>
  28 #include <linux/init.h>
  29 #include <linux/blkdev.h>
  30
  31 #include <asm/io.h>
  32 #include <asm/system.h>
  33
  34 #include "../scsi.h"
  35 #include <scsi/scsi_host.h>
  36
  37 #define NCR5380_implementation_fields   int port, ctrl
  38 #define NCR5380_local_declare()         struct Scsi_Host *_instance
  39 #define NCR5380_setup(instance)         _instance = instance
  40
  41 #define NCR5380_read(reg)               ecoscsi_read(_instance, reg)
  42 #define NCR5380_write(reg, value)       ecoscsi_write(_instance, reg, value)
  43
  44 #define NCR5380_intr                    ecoscsi_intr
  45 #define NCR5380_queue_command           ecoscsi_queue_command
  46 #define NCR5380_proc_info               ecoscsi_proc_info
  47
  48 #include "../NCR5380.h"
  49
  50 #define ECOSCSI_PUBLIC_RELEASE 1
  51
  52 static char ecoscsi_read(struct Scsi_Host *instance, int reg)
  53 {
  54   int iobase = instance->io_port;
  55   outb(reg | 8, iobase);
  56   return inb(iobase + 1);
  57 }
  58
  59 static void ecoscsi_write(struct Scsi_Host *instance, int reg, int value)
  60 {
  61   int iobase = instance->io_port;
  62   outb(reg | 8, iobase);
  63   outb(value, iobase + 1);
  64 }
  65
  66 /*
  67  * Function : ecoscsi_setup(char *str, int *ints)
  68  *
  69  * Purpose : LILO command line initialization of the overrides array,
  70  *
  71  * Inputs : str - unused, ints - array of integer parameters with ints[0]
  72  *      equal to the number of ints.
  73  *
  74  */
  75
  76 void ecoscsi_setup(char *str, int *ints)
  77 {
  78 }
  79
  80 const char * ecoscsi_info (struct Scsi_Host *spnt)
  81 {
  82         return "";
  83 }
  84
  85 #if 0
  86 #define STAT(p) inw(p + 144)
  87
  88 static inline int NCR5380_pwrite(struct Scsi_Host *host, unsigned char *addr,
  89               int len)
  90 {
  91   int iobase = host->io_port;
  92 printk("writing %p len %d\n",addr, len);
  93   if(!len) return -1;
  94
  95   while(1)
  96   {
  97     int status;
  98     while(((status = STAT(iobase)) & 0x100)==0);
  99   }
 100 }
 101
 102 static inline int NCR5380_pread(struct Scsi_Host *host, unsigned char *addr,
 103               int len)
 104 {
 105   int iobase = host->io_port;
 106   int iobase2= host->io_port + 0x100;
 107   unsigned char *start = addr;
 108   int s;
 109 printk("reading %p len %d\n",addr, len);
 110   outb(inb(iobase + 128), iobase + 135);
 111   while(len > 0)
 112   {
 113     int status,b,i, timeout;
 114     timeout = 0x07FFFFFF;
 115     while(((status = STAT(iobase)) & 0x100)==0)
 116     {
 117       timeout--;
 118       if(status & 0x200 || !timeout)
 119       {
 120         printk("status = %p\n",status);
 121         outb(0, iobase + 135);
 122         return 1;
 123       }
 124     }
 125     if(len >= 128)
 126     {
 127       for(i=0; i<64; i++)
 128       {
 129         b = inw(iobase + 136);
 130         *addr++ = b;
 131         *addr++ = b>>8;
 132       }
 133       len -= 128;
 134     }
 135     else
 136     {
 137       b = inw(iobase + 136);
 138       *addr ++ = b;
 139       len -= 1;
 140       if(len)
 141         *addr ++ = b>>8;
 142       len -= 1;
 143     }
 144   }
 145   outb(0, iobase + 135);
 146   printk("first bytes = %02X %02X %02X %20X %02X %02X %02X\n",*start, start[1], start[2], start[3], start[4], start[5], start[6]);
 147   return 1;
 148 }
 149 #endif
 150 #undef STAT
 151
 152 #define BOARD_NORMAL    0
 153 #define BOARD_NCR53C400 1
 154
 155 #include "../NCR5380.c"
 156
 157 static struct scsi_host_template ecoscsi_template =  {
 158         .module         = THIS_MODULE,
 159         .name           = "Serial Port EcoSCSI NCR5380",
 160         .proc_name      = "ecoscsi",
 161         .info           = ecoscsi_info,
 162         .queuecommand   = ecoscsi_queue_command,
 163         .eh_abort_handler       = NCR5380_abort,
 164         .eh_bus_reset_handler   = NCR5380_bus_reset,
 165         .can_queue      = 16,
 166         .this_id        = 7,
 167         .sg_tablesize   = SG_ALL,
 168         .cmd_per_lun    = 2,
 169         .use_clustering = DISABLE_CLUSTERING
 170 };
 171
 172 static struct Scsi_Host *host;
 173
 174 static int __init ecoscsi_init(void)
 175 {
 176
 177         host = scsi_host_alloc(tpnt, sizeof(struct NCR5380_hostdata));
 178         if (!host)
 179                 return 0;
 180
 181         host->io_port = 0x80ce8000;
 182         host->n_io_port = 144;
 183         host->irq = IRQ_NONE;
 184
 185         if (!(request_region(host->io_port, host->n_io_port, "ecoscsi")) )
 186                 goto unregister_scsi;
 187
 188         ecoscsi_write(host, MODE_REG, 0x20);            /* Is it really SCSI? */
 189         if (ecoscsi_read(host, MODE_REG) != 0x20) /* Write to a reg.    */
 190                 goto release_reg;
 191
 192         ecoscsi_write(host, MODE_REG, 0x00 );           /* it back.           */
 193         if (ecoscsi_read(host, MODE_REG) != 0x00)
 194                 goto release_reg;
 195
 196         NCR5380_init(host, 0);
 197
 198         printk("scsi%d: at port 0x%08lx irqs disabled", host->host_no, host->io_port);
 199         printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
 200                 host->can_queue, host->cmd_per_lun, ECOSCSI_PUBLIC_RELEASE);
 201         printk("\nscsi%d:", host->host_no);
 202         NCR5380_print_options(host);
 203         printk("\n");
 204
 205         scsi_add_host(host, NULL); /* XXX handle failure */
 206         scsi_scan_host(host);
 207         return 0;
 208
 209 release_reg:
 210         release_region(host->io_port, host->n_io_port);
 211 unregister_scsi:
 212         scsi_host_put(host);
 213         return -ENODEV;
 214 }
 215
 216 static void __exit ecoscsi_exit(void)
 217 {
 218         scsi_remove_host(host);
 219
 220         if (shpnt->irq != IRQ_NONE)
 221                 free_irq(shpnt->irq, NULL);
 222         NCR5380_exit(host);
 223         if (shpnt->io_port)
 224                 release_region(shpnt->io_port, shpnt->n_io_port);
 225
 226         scsi_host_put(host);
 227         return 0;
 228 }
 229
 230 module_init(ecoscsi_init);
 231 module_exit(ecoscsi_exit);
 232
 233 MODULE_AUTHOR("Russell King");
 234 MODULE_DESCRIPTION("Econet-SCSI driver for Acorn machines");
 235 MODULE_LICENSE("GPL");
 236