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