drivers/scsi/arm/arxescsi.c

   1 /*
   2  * linux/arch/arm/drivers/scsi/arxescsi.c
   3  *
   4  * Copyright (C) 1997-2000 Russell King, Stefan Hanske
   5  *
   6  * This driver is based on experimentation.  Hence, it may have made
   7  * assumptions about the particular card that I have available, and
   8  * may not be reliable!
   9  *
  10  * Changelog:
  11  *  30-08-1997  RMK     0.0.0   Created, READONLY version as cumana_2.c
  12  *  22-01-1998  RMK     0.0.1   Updated to 2.1.80
  13  *  15-04-1998  RMK     0.0.1   Only do PIO if FAS216 will allow it.
  14  *  11-06-1998  SH      0.0.2   Changed to support ARXE 16-bit SCSI card
  15  *                              enabled writing
  16  *  01-01-2000  SH      0.1.0   Added *real* pseudo dma writing
  17  *                              (arxescsi_pseudo_dma_write)
  18  *  02-04-2000  RMK     0.1.1   Updated for new error handling code.
  19  *  22-10-2000  SH              Updated for new registering scheme.
  20  */
  21 #include <linux/module.h>
  22 #include <linux/blkdev.h>
  23 #include <linux/kernel.h>
  24 #include <linux/string.h>
  25 #include <linux/ioport.h>
  26 #include <linux/sched.h>
  27 #include <linux/proc_fs.h>
  28 #include <linux/unistd.h>
  29 #include <linux/stat.h>
  30 #include <linux/delay.h>
  31 #include <linux/init.h>
  32 #include <linux/interrupt.h>
  33
  34 #include <asm/dma.h>
  35 #include <asm/io.h>
  36 #include <asm/irq.h>
  37 #include <asm/ecard.h>
  38
  39 #include "../scsi.h"
  40 #include <scsi/scsi_host.h>
  41 #include "fas216.h"
  42
  43 struct arxescsi_info {
  44         FAS216_Info             info;
  45         struct expansion_card   *ec;
  46 };
  47
  48 #define DMADATA_OFFSET  (0x200)
  49
  50 #define DMASTAT_OFFSET  (0x600)
  51 #define DMASTAT_DRQ     (1 << 0)
  52
  53 #define CSTATUS_IRQ     (1 << 0)
  54
  55 #define VERSION "1.10 (23/01/2003 2.5.57)"
  56
  57 /*
  58  * Function: int arxescsi_dma_setup(host, SCpnt, direction, min_type)
  59  * Purpose : initialises DMA/PIO
  60  * Params  : host      - host
  61  *           SCpnt     - command
  62  *           direction - DMA on to/off of card
  63  *           min_type  - minimum DMA support that we must have for this transfer
  64  * Returns : 0 if we should not set CMD_WITHDMA for transfer info command
  65  */
  66 static fasdmatype_t
  67 arxescsi_dma_setup(struct Scsi_Host *host, Scsi_Pointer *SCp,
  68                        fasdmadir_t direction, fasdmatype_t min_type)
  69 {
  70         /*
  71          * We don't do real DMA
  72          */
  73         return fasdma_pseudo;
  74 }
  75
  76 static void arxescsi_pseudo_dma_write(unsigned char *addr, unsigned char *base)
  77 {
  78        __asm__ __volatile__(
  79        "               stmdb   sp!, {r0-r12}\n"
  80        "               mov     r3, %0\n"
  81        "               mov     r1, %1\n"
  82        "               add     r2, r1, #512\n"
  83        "               mov     r4, #256\n"
  84        ".loop_1:       ldmia   r3!, {r6, r8, r10, r12}\n"
  85        "               mov     r5, r6, lsl #16\n"
  86        "               mov     r7, r8, lsl #16\n"
  87        ".loop_2:       ldrb    r0, [r1, #1536]\n"
  88        "               tst     r0, #1\n"
  89        "               beq     .loop_2\n"
  90        "               stmia   r2, {r5-r8}\n\t"
  91        "               mov     r9, r10, lsl #16\n"
  92        "               mov     r11, r12, lsl #16\n"
  93        ".loop_3:       ldrb    r0, [r1, #1536]\n"
  94        "               tst     r0, #1\n"
  95        "               beq     .loop_3\n"
  96        "               stmia   r2, {r9-r12}\n"
  97        "               subs    r4, r4, #16\n"
  98        "               bne     .loop_1\n"
  99        "               ldmia   sp!, {r0-r12}\n"
 100        :
 101        : "r" (addr), "r" (base));
 102 }
 103
 104 /*
 105  * Function: int arxescsi_dma_pseudo(host, SCpnt, direction, transfer)
 106  * Purpose : handles pseudo DMA
 107  * Params  : host      - host
 108  *           SCpnt     - command
 109  *           direction - DMA on to/off of card
 110  *           transfer  - minimum number of bytes we expect to transfer
 111  */
 112 static void
 113 arxescsi_dma_pseudo(struct Scsi_Host *host, Scsi_Pointer *SCp,
 114                     fasdmadir_t direction, int transfer)
 115 {
 116         struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;
 117         unsigned int length, error = 0;
 118         unsigned char *base = info->info.scsi.io_base;
 119         unsigned char *addr;
 120
 121         length = SCp->this_residual;
 122         addr = SCp->ptr;
 123
 124         if (direction == DMA_OUT) {
 125                 unsigned int word;
 126                 while (length > 256) {
 127                         if (readb(base + 0x80) & STAT_INT) {
 128                                 error = 1;
 129                                 break;
 130                         }
 131                         arxescsi_pseudo_dma_write(addr, base);
 132                         addr += 256;
 133                         length -= 256;
 134                 }
 135
 136                 if (!error)
 137                         while (length > 0) {
 138                                 if (readb(base + 0x80) & STAT_INT)
 139                                         break;
 140
 141                                 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
 142                                         continue;
 143
 144                                 word = *addr | *(addr + 1) << 8;
 145
 146                                 writew(word, base + DMADATA_OFFSET);
 147                                 if (length > 1) {
 148                                         addr += 2;
 149                                         length -= 2;
 150                                 } else {
 151                                         addr += 1;
 152                                         length -= 1;
 153                                 }
 154                         }
 155         }
 156         else {
 157                 if (transfer && (transfer & 255)) {
 158                         while (length >= 256) {
 159                                 if (readb(base + 0x80) & STAT_INT) {
 160                                         error = 1;
 161                                         break;
 162                                 }
 163
 164                                 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
 165                                         continue;
 166
 167                                 readsw(base + DMADATA_OFFSET, addr, 256 >> 1);
 168                                 addr += 256;
 169                                 length -= 256;
 170                         }
 171                 }
 172
 173                 if (!(error))
 174                         while (length > 0) {
 175                                 unsigned long word;
 176
 177                                 if (readb(base + 0x80) & STAT_INT)
 178                                         break;
 179
 180                                 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
 181                                         continue;
 182
 183                                 word = readw(base + DMADATA_OFFSET);
 184                                 *addr++ = word;
 185                                 if (--length > 0) {
 186                                         *addr++ = word >> 8;
 187                                         length --;
 188                                 }
 189                         }
 190         }
 191 }
 192
 193 /*
 194  * Function: int arxescsi_dma_stop(host, SCpnt)
 195  * Purpose : stops DMA/PIO
 196  * Params  : host  - host
 197  *           SCpnt - command
 198  */
 199 static void arxescsi_dma_stop(struct Scsi_Host *host, Scsi_Pointer *SCp)
 200 {
 201         /*
 202          * no DMA to stop
 203          */
 204 }
 205
 206 /*
 207  * Function: const char *arxescsi_info(struct Scsi_Host * host)
 208  * Purpose : returns a descriptive string about this interface,
 209  * Params  : host - driver host structure to return info for.
 210  * Returns : pointer to a static buffer containing null terminated string.
 211  */
 212 static const char *arxescsi_info(struct Scsi_Host *host)
 213 {
 214         struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;
 215         static char string[150];
 216
 217         sprintf(string, "%s (%s) in slot %d v%s",
 218                 host->hostt->name, info->info.scsi.type, info->ec->slot_no,
 219                 VERSION);
 220
 221         return string;
 222 }
 223
 224 /*
 225  * Function: int arxescsi_proc_info(char *buffer, char **start, off_t offset,
 226  *                                       int length, int host_no, int inout)
 227  * Purpose : Return information about the driver to a user process accessing
 228  *           the /proc filesystem.
 229  * Params  : buffer - a buffer to write information to
 230  *           start  - a pointer into this buffer set by this routine to the start
 231  *                    of the required information.
 232  *           offset - offset into information that we have read upto.
 233  *           length - length of buffer
 234  *           host_no - host number to return information for
 235  *           inout  - 0 for reading, 1 for writing.
 236  * Returns : length of data written to buffer.
 237  */
 238 static int
 239 arxescsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, int length,
 240                    int inout)
 241 {
 242         struct arxescsi_info *info;
 243         char *p = buffer;
 244         int pos;
 245
 246         info = (struct arxescsi_info *)host->hostdata;
 247         if (inout == 1)
 248                 return -EINVAL;
 249
 250         p += sprintf(p, "ARXE 16-bit SCSI driver v%s\n", VERSION);
 251         p += fas216_print_host(&info->info, p);
 252         p += fas216_print_stats(&info->info, p);
 253         p += fas216_print_devices(&info->info, p);
 254
 255         *start = buffer + offset;
 256         pos = p - buffer - offset;
 257         if (pos > length)
 258                 pos = length;
 259
 260         return pos;
 261 }
 262
 263 static Scsi_Host_Template arxescsi_template = {
 264         .proc_info                      = arxescsi_proc_info,
 265         .name                           = "ARXE SCSI card",
 266         .info                           = arxescsi_info,
 267         .queuecommand                   = fas216_noqueue_command,
 268         .eh_host_reset_handler          = fas216_eh_host_reset,
 269         .eh_bus_reset_handler           = fas216_eh_bus_reset,
 270         .eh_device_reset_handler        = fas216_eh_device_reset,
 271         .eh_abort_handler               = fas216_eh_abort,
 272         .can_queue                      = 0,
 273         .this_id                        = 7,
 274         .sg_tablesize                   = SG_ALL,
 275         .cmd_per_lun                    = 1,
 276         .use_clustering                 = DISABLE_CLUSTERING,
 277         .proc_name                      = "arxescsi",
 278 };
 279
 280 static int __devinit
 281 arxescsi_probe(struct expansion_card *ec, const struct ecard_id *id)
 282 {
 283         struct Scsi_Host *host;
 284         struct arxescsi_info *info;
 285         unsigned long resbase, reslen;
 286         unsigned char *base;
 287         int ret;
 288
 289         resbase = ecard_resource_start(ec, ECARD_RES_MEMC);
 290         reslen = ecard_resource_len(ec, ECARD_RES_MEMC);
 291
 292         if (!request_mem_region(resbase, reslen, "arxescsi")) {
 293                 ret = -EBUSY;
 294                 goto out;
 295         }
 296
 297         base = ioremap(resbase, reslen);
 298         if (!base) {
 299                 ret = -ENOMEM;
 300                 goto out_region;
 301         }
 302
 303         host = scsi_host_alloc(&arxescsi_template, sizeof(struct arxescsi_info));
 304         if (!host) {
 305                 ret = -ENOMEM;
 306                 goto out_unmap;
 307         }
 308
 309         host->base = (unsigned long)base;
 310         host->irq = NO_IRQ;
 311         host->dma_channel = NO_DMA;
 312
 313         info = (struct arxescsi_info *)host->hostdata;
 314         info->ec = ec;
 315
 316         info->info.scsi.io_base         = base + 0x2000;
 317         info->info.scsi.irq             = host->irq;
 318         info->info.scsi.io_shift        = 5;
 319         info->info.ifcfg.clockrate      = 24; /* MHz */
 320         info->info.ifcfg.select_timeout = 255;
 321         info->info.ifcfg.asyncperiod    = 200; /* ns */
 322         info->info.ifcfg.sync_max_depth = 0;
 323         info->info.ifcfg.cntl3          = CNTL3_FASTSCSI | CNTL3_FASTCLK;
 324         info->info.ifcfg.disconnect_ok  = 0;
 325         info->info.ifcfg.wide_max_size  = 0;
 326         info->info.ifcfg.capabilities   = FASCAP_PSEUDODMA;
 327         info->info.dma.setup            = arxescsi_dma_setup;
 328         info->info.dma.pseudo           = arxescsi_dma_pseudo;
 329         info->info.dma.stop             = arxescsi_dma_stop;
 330
 331         ec->irqaddr = base;
 332         ec->irqmask = CSTATUS_IRQ;
 333
 334         ret = fas216_init(host);
 335         if (ret)
 336                 goto out_unregister;
 337
 338         ret = fas216_add(host, &ec->dev);
 339         if (ret == 0)
 340                 goto out;
 341
 342         fas216_release(host);
 343  out_unregister:
 344         scsi_host_put(host);
 345  out_unmap:
 346         iounmap(base);
 347  out_region:
 348         release_mem_region(resbase, reslen);
 349  out:
 350         return ret;
 351 }
 352
 353 static void __devexit arxescsi_remove(struct expansion_card *ec)
 354 {
 355         struct Scsi_Host *host = ecard_get_drvdata(ec);
 356         unsigned long resbase, reslen;
 357
 358         ecard_set_drvdata(ec, NULL);
 359         fas216_remove(host);
 360
 361         iounmap((void *)host->base);
 362
 363         resbase = ecard_resource_start(ec, ECARD_RES_MEMC);
 364         reslen = ecard_resource_len(ec, ECARD_RES_MEMC);
 365
 366         release_mem_region(resbase, reslen);
 367
 368         fas216_release(host);
 369         scsi_host_put(host);
 370 }
 371
 372 static const struct ecard_id arxescsi_cids[] = {
 373         { MANU_ARXE, PROD_ARXE_SCSI },
 374         { 0xffff, 0xffff },
 375 };
 376
 377 static struct ecard_driver arxescsi_driver = {
 378         .probe          = arxescsi_probe,
 379         .remove         = __devexit_p(arxescsi_remove),
 380         .id_table       = arxescsi_cids,
 381         .drv = {
 382                 .name           = "arxescsi",
 383         },
 384 };
 385
 386 static int __init init_arxe_scsi_driver(void)
 387 {
 388         return ecard_register_driver(&arxescsi_driver);
 389 }
 390
 391 static void __exit exit_arxe_scsi_driver(void)
 392 {
 393         ecard_remove_driver(&arxescsi_driver);
 394 }
 395
 396 module_init(init_arxe_scsi_driver);
 397 module_exit(exit_arxe_scsi_driver);
 398
 399 MODULE_AUTHOR("Stefan Hanske");
 400 MODULE_DESCRIPTION("ARXESCSI driver for Acorn machines");
 401 MODULE_LICENSE("GPL");
 402