drivers/scsi/arm/arxescsi.c

   1 /*
   2  * linux/drivers/scsi/arm/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/proc_fs.h>
  27 #include <linux/unistd.h>
  28 #include <linux/stat.h>
  29 #include <linux/delay.h>
  30 #include <linux/init.h>
  31 #include <linux/interrupt.h>
  32
  33 #include <asm/dma.h>
  34 #include <asm/io.h>
  35 #include <asm/ecard.h>
  36
  37 #include "../scsi.h"
  38 #include <scsi/scsi_host.h>
  39 #include "fas216.h"
  40
  41 struct arxescsi_info {
  42         FAS216_Info             info;
  43         struct expansion_card   *ec;
  44         void __iomem            *base;
  45 };
  46
  47 #define DMADATA_OFFSET  (0x200)
  48
  49 #define DMASTAT_OFFSET  (0x600)
  50 #define DMASTAT_DRQ     (1 << 0)
  51
  52 #define CSTATUS_IRQ     (1 << 0)
  53
  54 #define VERSION "1.10 (23/01/2003 2.5.57)"
  55
  56 /*
  57  * Function: int arxescsi_dma_setup(host, SCpnt, direction, min_type)
  58  * Purpose : initialises DMA/PIO
  59  * Params  : host      - host
  60  *           SCpnt     - command
  61  *           direction - DMA on to/off of card
  62  *           min_type  - minimum DMA support that we must have for this transfer
  63  * Returns : 0 if we should not set CMD_WITHDMA for transfer info command
  64  */
  65 static fasdmatype_t
  66 arxescsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
  67                        fasdmadir_t direction, fasdmatype_t min_type)
  68 {
  69         /*
  70          * We don't do real DMA
  71          */
  72         return fasdma_pseudo;
  73 }
  74
  75 static void arxescsi_pseudo_dma_write(unsigned char *addr, void __iomem *base)
  76 {
  77        __asm__ __volatile__(
  78        "               stmdb   sp!, {r0-r12}\n"
  79        "               mov     r3, %0\n"
  80        "               mov     r1, %1\n"
  81        "               add     r2, r1, #512\n"
  82        "               mov     r4, #256\n"
  83        ".loop_1:       ldmia   r3!, {r6, r8, r10, r12}\n"
  84        "               mov     r5, r6, lsl #16\n"
  85        "               mov     r7, r8, lsl #16\n"
  86        ".loop_2:       ldrb    r0, [r1, #1536]\n"
  87        "               tst     r0, #1\n"
  88        "               beq     .loop_2\n"
  89        "               stmia   r2, {r5-r8}\n\t"
  90        "               mov     r9, r10, lsl #16\n"
  91        "               mov     r11, r12, lsl #16\n"
  92        ".loop_3:       ldrb    r0, [r1, #1536]\n"
  93        "               tst     r0, #1\n"
  94        "               beq     .loop_3\n"
  95        "               stmia   r2, {r9-r12}\n"
  96        "               subs    r4, r4, #16\n"
  97        "               bne     .loop_1\n"
  98        "               ldmia   sp!, {r0-r12}\n"
  99        :
 100        : "r" (addr), "r" (base));
 101 }
 102
 103 /*
 104  * Function: int arxescsi_dma_pseudo(host, SCpnt, direction, transfer)
 105  * Purpose : handles pseudo DMA
 106  * Params  : host      - host
 107  *           SCpnt     - command
 108  *           direction - DMA on to/off of card
 109  *           transfer  - minimum number of bytes we expect to transfer
 110  */
 111 static void
 112 arxescsi_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
 113                     fasdmadir_t direction, int transfer)
 114 {
 115         struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;
 116         unsigned int length, error = 0;
 117         void __iomem *base = info->info.scsi.io_base;
 118         unsigned char *addr;
 119
 120         length = SCp->this_residual;
 121         addr = SCp->ptr;
 122
 123         if (direction == DMA_OUT) {
 124                 unsigned int word;
 125                 while (length > 256) {
 126                         if (readb(base + 0x80) & STAT_INT) {
 127                                 error = 1;
 128                                 break;
 129                         }
 130                         arxescsi_pseudo_dma_write(addr, base);
 131                         addr += 256;
 132                         length -= 256;
 133                 }
 134
 135                 if (!error)
 136                         while (length > 0) {
 137                                 if (readb(base + 0x80) & STAT_INT)
 138                                         break;
 139
 140                                 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
 141                                         continue;
 142
 143                                 word = *addr | *(addr + 1) << 8;
 144
 145                                 writew(word, base + DMADATA_OFFSET);
 146                                 if (length > 1) {
 147                                         addr += 2;
 148                                         length -= 2;
 149                                 } else {
 150                                         addr += 1;
 151                                         length -= 1;
 152                                 }
 153                         }
 154         }
 155         else {
 156                 if (transfer && (transfer & 255)) {
 157                         while (length >= 256) {
 158                                 if (readb(base + 0x80) & STAT_INT) {
 159                                         error = 1;
 160                                         break;
 161                                 }
 162
 163                                 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
 164                                         continue;
 165
 166                                 readsw(base + DMADATA_OFFSET, addr, 256 >> 1);
 167                                 addr += 256;
 168                                 length -= 256;
 169                         }
 170                 }
 171
 172                 if (!(error))
 173                         while (length > 0) {
 174                                 unsigned long word;
 175
 176                                 if (readb(base + 0x80) & STAT_INT)
 177                                         break;
 178
 179                                 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
 180                                         continue;
 181
 182                                 word = readw(base + DMADATA_OFFSET);
 183                                 *addr++ = word;
 184                                 if (--length > 0) {
 185                                         *addr++ = word >> 8;
 186                                         length --;
 187                                 }
 188                         }
 189         }
 190 }
 191
 192 /*
 193  * Function: int arxescsi_dma_stop(host, SCpnt)
 194  * Purpose : stops DMA/PIO
 195  * Params  : host  - host
 196  *           SCpnt - command
 197  */
 198 static void arxescsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
 199 {
 200         /*
 201          * no DMA to stop
 202          */
 203 }
 204
 205 /*
 206  * Function: const char *arxescsi_info(struct Scsi_Host * host)
 207  * Purpose : returns a descriptive string about this interface,
 208  * Params  : host - driver host structure to return info for.
 209  * Returns : pointer to a static buffer containing null terminated string.
 210  */
 211 static const char *arxescsi_info(struct Scsi_Host *host)
 212 {
 213         struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;
 214         static char string[150];
 215
 216         sprintf(string, "%s (%s) in slot %d v%s",
 217                 host->hostt->name, info->info.scsi.type, info->ec->slot_no,
 218                 VERSION);
 219
 220         return string;
 221 }
 222
 223 static int
 224 arxescsi_show_info(struct seq_file *m, struct Scsi_Host *host)
 225 {
 226         struct arxescsi_info *info;
 227         info = (struct arxescsi_info *)host->hostdata;
 228
 229         seq_printf(m, "ARXE 16-bit SCSI driver v%s\n", VERSION);
 230         fas216_print_host(&info->info, m);
 231         fas216_print_stats(&info->info, m);
 232         fas216_print_devices(&info->info, m);
 233         return 0;
 234 }
 235
 236 static struct scsi_host_template arxescsi_template = {
 237         .show_info                      = arxescsi_show_info,
 238         .name                           = "ARXE SCSI card",
 239         .info                           = arxescsi_info,
 240         .queuecommand                   = fas216_noqueue_command,
 241         .eh_host_reset_handler          = fas216_eh_host_reset,
 242         .eh_bus_reset_handler           = fas216_eh_bus_reset,
 243         .eh_device_reset_handler        = fas216_eh_device_reset,
 244         .eh_abort_handler               = fas216_eh_abort,
 245         .can_queue                      = 0,
 246         .this_id                        = 7,
 247         .sg_tablesize                   = SG_ALL,
 248         .use_clustering                 = DISABLE_CLUSTERING,
 249         .proc_name                      = "arxescsi",
 250 };
 251
 252 static int arxescsi_probe(struct expansion_card *ec, const struct ecard_id *id)
 253 {
 254         struct Scsi_Host *host;
 255         struct arxescsi_info *info;
 256         void __iomem *base;
 257         int ret;
 258
 259         ret = ecard_request_resources(ec);
 260         if (ret)
 261                 goto out;
 262
 263         base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
 264         if (!base) {
 265                 ret = -ENOMEM;
 266                 goto out_region;
 267         }
 268
 269         host = scsi_host_alloc(&arxescsi_template, sizeof(struct arxescsi_info));
 270         if (!host) {
 271                 ret = -ENOMEM;
 272                 goto out_region;
 273         }
 274
 275         info = (struct arxescsi_info *)host->hostdata;
 276         info->ec = ec;
 277         info->base = base;
 278
 279         info->info.scsi.io_base         = base + 0x2000;
 280         info->info.scsi.irq             = 0;
 281         info->info.scsi.dma             = NO_DMA;
 282         info->info.scsi.io_shift        = 5;
 283         info->info.ifcfg.clockrate      = 24; /* MHz */
 284         info->info.ifcfg.select_timeout = 255;
 285         info->info.ifcfg.asyncperiod    = 200; /* ns */
 286         info->info.ifcfg.sync_max_depth = 0;
 287         info->info.ifcfg.cntl3          = CNTL3_FASTSCSI | CNTL3_FASTCLK;
 288         info->info.ifcfg.disconnect_ok  = 0;
 289         info->info.ifcfg.wide_max_size  = 0;
 290         info->info.ifcfg.capabilities   = FASCAP_PSEUDODMA;
 291         info->info.dma.setup            = arxescsi_dma_setup;
 292         info->info.dma.pseudo           = arxescsi_dma_pseudo;
 293         info->info.dma.stop             = arxescsi_dma_stop;
 294
 295         ec->irqaddr = base;
 296         ec->irqmask = CSTATUS_IRQ;
 297
 298         ret = fas216_init(host);
 299         if (ret)
 300                 goto out_unregister;
 301
 302         ret = fas216_add(host, &ec->dev);
 303         if (ret == 0)
 304                 goto out;
 305
 306         fas216_release(host);
 307  out_unregister:
 308         scsi_host_put(host);
 309  out_region:
 310         ecard_release_resources(ec);
 311  out:
 312         return ret;
 313 }
 314
 315 static void arxescsi_remove(struct expansion_card *ec)
 316 {
 317         struct Scsi_Host *host = ecard_get_drvdata(ec);
 318
 319         ecard_set_drvdata(ec, NULL);
 320         fas216_remove(host);
 321
 322         fas216_release(host);
 323         scsi_host_put(host);
 324         ecard_release_resources(ec);
 325 }
 326
 327 static const struct ecard_id arxescsi_cids[] = {
 328         { MANU_ARXE, PROD_ARXE_SCSI },
 329         { 0xffff, 0xffff },
 330 };
 331
 332 static struct ecard_driver arxescsi_driver = {
 333         .probe          = arxescsi_probe,
 334         .remove         = arxescsi_remove,
 335         .id_table       = arxescsi_cids,
 336         .drv = {
 337                 .name           = "arxescsi",
 338         },
 339 };
 340
 341 static int __init init_arxe_scsi_driver(void)
 342 {
 343         return ecard_register_driver(&arxescsi_driver);
 344 }
 345
 346 static void __exit exit_arxe_scsi_driver(void)
 347 {
 348         ecard_remove_driver(&arxescsi_driver);
 349 }
 350
 351 module_init(init_arxe_scsi_driver);
 352 module_exit(exit_arxe_scsi_driver);
 353
 354 MODULE_AUTHOR("Stefan Hanske");
 355 MODULE_DESCRIPTION("ARXESCSI driver for Acorn machines");
 356 MODULE_LICENSE("GPL");
 357