linux/drivers/scsi/arm/arxescsi.c
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   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
  41struct 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 */
  65static fasdmatype_t
  66arxescsi_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
  75static 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 */
 111static void
 112arxescsi_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 */
 198static 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 */
 211static 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
 223static int
 224arxescsi_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
 236static 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        .cmd_per_lun                    = 1,
 249        .use_clustering                 = DISABLE_CLUSTERING,
 250        .proc_name                      = "arxescsi",
 251};
 252
 253static int arxescsi_probe(struct expansion_card *ec, const struct ecard_id *id)
 254{
 255        struct Scsi_Host *host;
 256        struct arxescsi_info *info;
 257        void __iomem *base;
 258        int ret;
 259
 260        ret = ecard_request_resources(ec);
 261        if (ret)
 262                goto out;
 263
 264        base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
 265        if (!base) {
 266                ret = -ENOMEM;
 267                goto out_region;
 268        }
 269
 270        host = scsi_host_alloc(&arxescsi_template, sizeof(struct arxescsi_info));
 271        if (!host) {
 272                ret = -ENOMEM;
 273                goto out_region;
 274        }
 275
 276        info = (struct arxescsi_info *)host->hostdata;
 277        info->ec = ec;
 278        info->base = base;
 279
 280        info->info.scsi.io_base         = base + 0x2000;
 281        info->info.scsi.irq             = 0;
 282        info->info.scsi.dma             = NO_DMA;
 283        info->info.scsi.io_shift        = 5;
 284        info->info.ifcfg.clockrate      = 24; /* MHz */
 285        info->info.ifcfg.select_timeout = 255;
 286        info->info.ifcfg.asyncperiod    = 200; /* ns */
 287        info->info.ifcfg.sync_max_depth = 0;
 288        info->info.ifcfg.cntl3          = CNTL3_FASTSCSI | CNTL3_FASTCLK;
 289        info->info.ifcfg.disconnect_ok  = 0;
 290        info->info.ifcfg.wide_max_size  = 0;
 291        info->info.ifcfg.capabilities   = FASCAP_PSEUDODMA;
 292        info->info.dma.setup            = arxescsi_dma_setup;
 293        info->info.dma.pseudo           = arxescsi_dma_pseudo;
 294        info->info.dma.stop             = arxescsi_dma_stop;
 295                
 296        ec->irqaddr = base;
 297        ec->irqmask = CSTATUS_IRQ;
 298
 299        ret = fas216_init(host);
 300        if (ret)
 301                goto out_unregister;
 302
 303        ret = fas216_add(host, &ec->dev);
 304        if (ret == 0)
 305                goto out;
 306
 307        fas216_release(host);
 308 out_unregister:
 309        scsi_host_put(host);
 310 out_region:
 311        ecard_release_resources(ec);
 312 out:
 313        return ret;
 314}
 315
 316static void arxescsi_remove(struct expansion_card *ec)
 317{
 318        struct Scsi_Host *host = ecard_get_drvdata(ec);
 319
 320        ecard_set_drvdata(ec, NULL);
 321        fas216_remove(host);
 322
 323        fas216_release(host);
 324        scsi_host_put(host);
 325        ecard_release_resources(ec);
 326}
 327
 328static const struct ecard_id arxescsi_cids[] = {
 329        { MANU_ARXE, PROD_ARXE_SCSI },
 330        { 0xffff, 0xffff },
 331};
 332
 333static struct ecard_driver arxescsi_driver = {
 334        .probe          = arxescsi_probe,
 335        .remove         = arxescsi_remove,
 336        .id_table       = arxescsi_cids,
 337        .drv = {
 338                .name           = "arxescsi",
 339        },
 340};
 341
 342static int __init init_arxe_scsi_driver(void)
 343{
 344        return ecard_register_driver(&arxescsi_driver);
 345}
 346
 347static void __exit exit_arxe_scsi_driver(void)
 348{
 349        ecard_remove_driver(&arxescsi_driver);
 350}
 351
 352module_init(init_arxe_scsi_driver);
 353module_exit(exit_arxe_scsi_driver);
 354
 355MODULE_AUTHOR("Stefan Hanske");
 356MODULE_DESCRIPTION("ARXESCSI driver for Acorn machines");
 357MODULE_LICENSE("GPL");
 358
 359