linux/drivers/scsi/arm/powertec.c
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   1/*
   2 *  linux/drivers/acorn/scsi/powertec.c
   3 *
   4 *  Copyright (C) 1997-2005 Russell King
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 */
  10#include <linux/module.h>
  11#include <linux/blkdev.h>
  12#include <linux/kernel.h>
  13#include <linux/string.h>
  14#include <linux/ioport.h>
  15#include <linux/proc_fs.h>
  16#include <linux/delay.h>
  17#include <linux/interrupt.h>
  18#include <linux/init.h>
  19#include <linux/dma-mapping.h>
  20
  21#include <asm/dma.h>
  22#include <asm/ecard.h>
  23#include <asm/io.h>
  24#include <asm/pgtable.h>
  25
  26#include "../scsi.h"
  27#include <scsi/scsi_host.h>
  28#include "fas216.h"
  29#include "scsi.h"
  30
  31#include <scsi/scsicam.h>
  32
  33#define POWERTEC_FAS216_OFFSET  0x3000
  34#define POWERTEC_FAS216_SHIFT   6
  35
  36#define POWERTEC_INTR_STATUS    0x2000
  37#define POWERTEC_INTR_BIT       0x80
  38
  39#define POWERTEC_RESET_CONTROL  0x1018
  40#define POWERTEC_RESET_BIT      1
  41
  42#define POWERTEC_TERM_CONTROL   0x2018
  43#define POWERTEC_TERM_ENABLE    1
  44
  45#define POWERTEC_INTR_CONTROL   0x101c
  46#define POWERTEC_INTR_ENABLE    1
  47#define POWERTEC_INTR_DISABLE   0
  48
  49#define VERSION "1.10 (19/01/2003 2.5.59)"
  50
  51/*
  52 * Use term=0,1,0,0,0 to turn terminators on/off.
  53 * One entry per slot.
  54 */
  55static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
  56
  57#define NR_SG   256
  58
  59struct powertec_info {
  60        FAS216_Info             info;
  61        struct expansion_card   *ec;
  62        void __iomem            *base;
  63        unsigned int            term_ctl;
  64        struct scatterlist      sg[NR_SG];
  65};
  66
  67/* Prototype: void powertecscsi_irqenable(ec, irqnr)
  68 * Purpose  : Enable interrupts on Powertec SCSI card
  69 * Params   : ec    - expansion card structure
  70 *          : irqnr - interrupt number
  71 */
  72static void
  73powertecscsi_irqenable(struct expansion_card *ec, int irqnr)
  74{
  75        struct powertec_info *info = ec->irq_data;
  76        writeb(POWERTEC_INTR_ENABLE, info->base + POWERTEC_INTR_CONTROL);
  77}
  78
  79/* Prototype: void powertecscsi_irqdisable(ec, irqnr)
  80 * Purpose  : Disable interrupts on Powertec SCSI card
  81 * Params   : ec    - expansion card structure
  82 *          : irqnr - interrupt number
  83 */
  84static void
  85powertecscsi_irqdisable(struct expansion_card *ec, int irqnr)
  86{
  87        struct powertec_info *info = ec->irq_data;
  88        writeb(POWERTEC_INTR_DISABLE, info->base + POWERTEC_INTR_CONTROL);
  89}
  90
  91static const expansioncard_ops_t powertecscsi_ops = {
  92        .irqenable      = powertecscsi_irqenable,
  93        .irqdisable     = powertecscsi_irqdisable,
  94};
  95
  96/* Prototype: void powertecscsi_terminator_ctl(host, on_off)
  97 * Purpose  : Turn the Powertec SCSI terminators on or off
  98 * Params   : host   - card to turn on/off
  99 *          : on_off - !0 to turn on, 0 to turn off
 100 */
 101static void
 102powertecscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
 103{
 104        struct powertec_info *info = (struct powertec_info *)host->hostdata;
 105
 106        info->term_ctl = on_off ? POWERTEC_TERM_ENABLE : 0;
 107        writeb(info->term_ctl, info->base + POWERTEC_TERM_CONTROL);
 108}
 109
 110/* Prototype: void powertecscsi_intr(irq, *dev_id, *regs)
 111 * Purpose  : handle interrupts from Powertec SCSI card
 112 * Params   : irq    - interrupt number
 113 *            dev_id - user-defined (Scsi_Host structure)
 114 */
 115static irqreturn_t powertecscsi_intr(int irq, void *dev_id)
 116{
 117        struct powertec_info *info = dev_id;
 118
 119        return fas216_intr(&info->info);
 120}
 121
 122/* Prototype: fasdmatype_t powertecscsi_dma_setup(host, SCpnt, direction, min_type)
 123 * Purpose  : initialises DMA/PIO
 124 * Params   : host      - host
 125 *            SCpnt     - command
 126 *            direction - DMA on to/off of card
 127 *            min_type  - minimum DMA support that we must have for this transfer
 128 * Returns  : type of transfer to be performed
 129 */
 130static fasdmatype_t
 131powertecscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
 132                       fasdmadir_t direction, fasdmatype_t min_type)
 133{
 134        struct powertec_info *info = (struct powertec_info *)host->hostdata;
 135        struct device *dev = scsi_get_device(host);
 136        int dmach = info->info.scsi.dma;
 137
 138        if (info->info.ifcfg.capabilities & FASCAP_DMA &&
 139            min_type == fasdma_real_all) {
 140                int bufs, map_dir, dma_dir;
 141
 142                bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
 143
 144                if (direction == DMA_OUT)
 145                        map_dir = DMA_TO_DEVICE,
 146                        dma_dir = DMA_MODE_WRITE;
 147                else
 148                        map_dir = DMA_FROM_DEVICE,
 149                        dma_dir = DMA_MODE_READ;
 150
 151                dma_map_sg(dev, info->sg, bufs, map_dir);
 152
 153                disable_dma(dmach);
 154                set_dma_sg(dmach, info->sg, bufs);
 155                set_dma_mode(dmach, dma_dir);
 156                enable_dma(dmach);
 157                return fasdma_real_all;
 158        }
 159
 160        /*
 161         * If we're not doing DMA,
 162         *  we'll do slow PIO
 163         */
 164        return fasdma_pio;
 165}
 166
 167/* Prototype: int powertecscsi_dma_stop(host, SCpnt)
 168 * Purpose  : stops DMA/PIO
 169 * Params   : host  - host
 170 *            SCpnt - command
 171 */
 172static void
 173powertecscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
 174{
 175        struct powertec_info *info = (struct powertec_info *)host->hostdata;
 176        if (info->info.scsi.dma != NO_DMA)
 177                disable_dma(info->info.scsi.dma);
 178}
 179
 180/* Prototype: const char *powertecscsi_info(struct Scsi_Host * host)
 181 * Purpose  : returns a descriptive string about this interface,
 182 * Params   : host - driver host structure to return info for.
 183 * Returns  : pointer to a static buffer containing null terminated string.
 184 */
 185const char *powertecscsi_info(struct Scsi_Host *host)
 186{
 187        struct powertec_info *info = (struct powertec_info *)host->hostdata;
 188        static char string[150];
 189
 190        sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
 191                host->hostt->name, info->info.scsi.type, info->ec->slot_no,
 192                VERSION, info->term_ctl ? "n" : "ff");
 193
 194        return string;
 195}
 196
 197/* Prototype: int powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
 198 * Purpose  : Set a driver specific function
 199 * Params   : host   - host to setup
 200 *          : buffer - buffer containing string describing operation
 201 *          : length - length of string
 202 * Returns  : -EINVAL, or 0
 203 */
 204static int
 205powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
 206{
 207        int ret = length;
 208
 209        if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) {
 210                buffer += 12;
 211                length -= 12;
 212
 213                if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
 214                        if (buffer[5] == '1')
 215                                powertecscsi_terminator_ctl(host, 1);
 216                        else if (buffer[5] == '0')
 217                                powertecscsi_terminator_ctl(host, 0);
 218                        else
 219                                ret = -EINVAL;
 220                } else
 221                        ret = -EINVAL;
 222        } else
 223                ret = -EINVAL;
 224
 225        return ret;
 226}
 227
 228/* Prototype: int powertecscsi_proc_info(char *buffer, char **start, off_t offset,
 229 *                                      int length, int host_no, int inout)
 230 * Purpose  : Return information about the driver to a user process accessing
 231 *            the /proc filesystem.
 232 * Params   : buffer  - a buffer to write information to
 233 *            start   - a pointer into this buffer set by this routine to the start
 234 *                      of the required information.
 235 *            offset  - offset into information that we have read up to.
 236 *            length  - length of buffer
 237 *            inout   - 0 for reading, 1 for writing.
 238 * Returns  : length of data written to buffer.
 239 */
 240static int powertecscsi_show_info(struct seq_file *m, struct Scsi_Host *host)
 241{
 242        struct powertec_info *info;
 243
 244        info = (struct powertec_info *)host->hostdata;
 245
 246        seq_printf(m, "PowerTec SCSI driver v%s\n", VERSION);
 247        fas216_print_host(&info->info, m);
 248        seq_printf(m, "Term    : o%s\n",
 249                        info->term_ctl ? "n" : "ff");
 250
 251        fas216_print_stats(&info->info, m);
 252        fas216_print_devices(&info->info, m);
 253        return 0;
 254}
 255
 256static ssize_t powertecscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf)
 257{
 258        struct expansion_card *ec = ECARD_DEV(dev);
 259        struct Scsi_Host *host = ecard_get_drvdata(ec);
 260        struct powertec_info *info = (struct powertec_info *)host->hostdata;
 261
 262        return sprintf(buf, "%d\n", info->term_ctl ? 1 : 0);
 263}
 264
 265static ssize_t
 266powertecscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
 267{
 268        struct expansion_card *ec = ECARD_DEV(dev);
 269        struct Scsi_Host *host = ecard_get_drvdata(ec);
 270
 271        if (len > 1)
 272                powertecscsi_terminator_ctl(host, buf[0] != '0');
 273
 274        return len;
 275}
 276
 277static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR,
 278                   powertecscsi_show_term, powertecscsi_store_term);
 279
 280static struct scsi_host_template powertecscsi_template = {
 281        .module                         = THIS_MODULE,
 282        .show_info                      = powertecscsi_show_info,
 283        .write_info                     = powertecscsi_set_proc_info,
 284        .name                           = "PowerTec SCSI",
 285        .info                           = powertecscsi_info,
 286        .queuecommand                   = fas216_queue_command,
 287        .eh_host_reset_handler          = fas216_eh_host_reset,
 288        .eh_bus_reset_handler           = fas216_eh_bus_reset,
 289        .eh_device_reset_handler        = fas216_eh_device_reset,
 290        .eh_abort_handler               = fas216_eh_abort,
 291
 292        .can_queue                      = 8,
 293        .this_id                        = 7,
 294        .sg_tablesize                   = SCSI_MAX_SG_CHAIN_SEGMENTS,
 295        .dma_boundary                   = IOMD_DMA_BOUNDARY,
 296        .cmd_per_lun                    = 2,
 297        .use_clustering                 = ENABLE_CLUSTERING,
 298        .proc_name                      = "powertec",
 299};
 300
 301static int powertecscsi_probe(struct expansion_card *ec,
 302                              const struct ecard_id *id)
 303{
 304        struct Scsi_Host *host;
 305        struct powertec_info *info;
 306        void __iomem *base;
 307        int ret;
 308
 309        ret = ecard_request_resources(ec);
 310        if (ret)
 311                goto out;
 312
 313        base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
 314        if (!base) {
 315                ret = -ENOMEM;
 316                goto out_region;
 317        }
 318
 319        host = scsi_host_alloc(&powertecscsi_template,
 320                               sizeof (struct powertec_info));
 321        if (!host) {
 322                ret = -ENOMEM;
 323                goto out_region;
 324        }
 325
 326        ecard_set_drvdata(ec, host);
 327
 328        info = (struct powertec_info *)host->hostdata;
 329        info->base = base;
 330        powertecscsi_terminator_ctl(host, term[ec->slot_no]);
 331
 332        info->ec = ec;
 333        info->info.scsi.io_base         = base + POWERTEC_FAS216_OFFSET;
 334        info->info.scsi.io_shift        = POWERTEC_FAS216_SHIFT;
 335        info->info.scsi.irq             = ec->irq;
 336        info->info.scsi.dma             = ec->dma;
 337        info->info.ifcfg.clockrate      = 40; /* MHz */
 338        info->info.ifcfg.select_timeout = 255;
 339        info->info.ifcfg.asyncperiod    = 200; /* ns */
 340        info->info.ifcfg.sync_max_depth = 7;
 341        info->info.ifcfg.cntl3          = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
 342        info->info.ifcfg.disconnect_ok  = 1;
 343        info->info.ifcfg.wide_max_size  = 0;
 344        info->info.ifcfg.capabilities   = 0;
 345        info->info.dma.setup            = powertecscsi_dma_setup;
 346        info->info.dma.pseudo           = NULL;
 347        info->info.dma.stop             = powertecscsi_dma_stop;
 348
 349        ec->irqaddr     = base + POWERTEC_INTR_STATUS;
 350        ec->irqmask     = POWERTEC_INTR_BIT;
 351
 352        ecard_setirq(ec, &powertecscsi_ops, info);
 353
 354        device_create_file(&ec->dev, &dev_attr_bus_term);
 355
 356        ret = fas216_init(host);
 357        if (ret)
 358                goto out_free;
 359
 360        ret = request_irq(ec->irq, powertecscsi_intr,
 361                          0, "powertec", info);
 362        if (ret) {
 363                printk("scsi%d: IRQ%d not free: %d\n",
 364                       host->host_no, ec->irq, ret);
 365                goto out_release;
 366        }
 367
 368        if (info->info.scsi.dma != NO_DMA) {
 369                if (request_dma(info->info.scsi.dma, "powertec")) {
 370                        printk("scsi%d: DMA%d not free, using PIO\n",
 371                               host->host_no, info->info.scsi.dma);
 372                        info->info.scsi.dma = NO_DMA;
 373                } else {
 374                        set_dma_speed(info->info.scsi.dma, 180);
 375                        info->info.ifcfg.capabilities |= FASCAP_DMA;
 376                }
 377        }
 378
 379        ret = fas216_add(host, &ec->dev);
 380        if (ret == 0)
 381                goto out;
 382
 383        if (info->info.scsi.dma != NO_DMA)
 384                free_dma(info->info.scsi.dma);
 385        free_irq(ec->irq, host);
 386
 387 out_release:
 388        fas216_release(host);
 389
 390 out_free:
 391        device_remove_file(&ec->dev, &dev_attr_bus_term);
 392        scsi_host_put(host);
 393
 394 out_region:
 395        ecard_release_resources(ec);
 396
 397 out:
 398        return ret;
 399}
 400
 401static void powertecscsi_remove(struct expansion_card *ec)
 402{
 403        struct Scsi_Host *host = ecard_get_drvdata(ec);
 404        struct powertec_info *info = (struct powertec_info *)host->hostdata;
 405
 406        ecard_set_drvdata(ec, NULL);
 407        fas216_remove(host);
 408
 409        device_remove_file(&ec->dev, &dev_attr_bus_term);
 410
 411        if (info->info.scsi.dma != NO_DMA)
 412                free_dma(info->info.scsi.dma);
 413        free_irq(ec->irq, info);
 414
 415        fas216_release(host);
 416        scsi_host_put(host);
 417        ecard_release_resources(ec);
 418}
 419
 420static const struct ecard_id powertecscsi_cids[] = {
 421        { MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI },
 422        { 0xffff, 0xffff },
 423};
 424
 425static struct ecard_driver powertecscsi_driver = {
 426        .probe          = powertecscsi_probe,
 427        .remove         = powertecscsi_remove,
 428        .id_table       = powertecscsi_cids,
 429        .drv = {
 430                .name           = "powertecscsi",
 431        },
 432};
 433
 434static int __init powertecscsi_init(void)
 435{
 436        return ecard_register_driver(&powertecscsi_driver);
 437}
 438
 439static void __exit powertecscsi_exit(void)
 440{
 441        ecard_remove_driver(&powertecscsi_driver);
 442}
 443
 444module_init(powertecscsi_init);
 445module_exit(powertecscsi_exit);
 446
 447MODULE_AUTHOR("Russell King");
 448MODULE_DESCRIPTION("Powertec SCSI driver");
 449module_param_array(term, int, NULL, 0);
 450MODULE_PARM_DESC(term, "SCSI bus termination");
 451MODULE_LICENSE("GPL");
 452