drivers/scsi/arm/powertec.c

   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/sched.h>
  16 #include <linux/proc_fs.h>
  17 #include <linux/delay.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/init.h>
  20 #include <linux/dma-mapping.h>
  21
  22 #include <asm/dma.h>
  23 #include <asm/ecard.h>
  24 #include <asm/io.h>
  25 #include <asm/pgtable.h>
  26
  27 #include "../scsi.h"
  28 #include <scsi/scsi_host.h>
  29 #include "fas216.h"
  30 #include "scsi.h"
  31
  32 #include <scsi/scsicam.h>
  33
  34 #define POWERTEC_FAS216_OFFSET  0x3000
  35 #define POWERTEC_FAS216_SHIFT   6
  36
  37 #define POWERTEC_INTR_STATUS    0x2000
  38 #define POWERTEC_INTR_BIT       0x80
  39
  40 #define POWERTEC_RESET_CONTROL  0x1018
  41 #define POWERTEC_RESET_BIT      1
  42
  43 #define POWERTEC_TERM_CONTROL   0x2018
  44 #define POWERTEC_TERM_ENABLE    1
  45
  46 #define POWERTEC_INTR_CONTROL   0x101c
  47 #define POWERTEC_INTR_ENABLE    1
  48 #define POWERTEC_INTR_DISABLE   0
  49
  50 #define VERSION "1.10 (19/01/2003 2.5.59)"
  51
  52 /*
  53  * Use term=0,1,0,0,0 to turn terminators on/off.
  54  * One entry per slot.
  55  */
  56 static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
  57
  58 #define NR_SG   256
  59
  60 struct powertec_info {
  61         FAS216_Info             info;
  62         struct expansion_card   *ec;
  63         void __iomem            *base;
  64         unsigned int            term_ctl;
  65         struct scatterlist      sg[NR_SG];
  66 };
  67
  68 /* Prototype: void powertecscsi_irqenable(ec, irqnr)
  69  * Purpose  : Enable interrupts on Powertec SCSI card
  70  * Params   : ec    - expansion card structure
  71  *          : irqnr - interrupt number
  72  */
  73 static void
  74 powertecscsi_irqenable(struct expansion_card *ec, int irqnr)
  75 {
  76         struct powertec_info *info = ec->irq_data;
  77         writeb(POWERTEC_INTR_ENABLE, info->base + POWERTEC_INTR_CONTROL);
  78 }
  79
  80 /* Prototype: void powertecscsi_irqdisable(ec, irqnr)
  81  * Purpose  : Disable interrupts on Powertec SCSI card
  82  * Params   : ec    - expansion card structure
  83  *          : irqnr - interrupt number
  84  */
  85 static void
  86 powertecscsi_irqdisable(struct expansion_card *ec, int irqnr)
  87 {
  88         struct powertec_info *info = ec->irq_data;
  89         writeb(POWERTEC_INTR_DISABLE, info->base + POWERTEC_INTR_CONTROL);
  90 }
  91
  92 static const expansioncard_ops_t powertecscsi_ops = {
  93         .irqenable      = powertecscsi_irqenable,
  94         .irqdisable     = powertecscsi_irqdisable,
  95 };
  96
  97 /* Prototype: void powertecscsi_terminator_ctl(host, on_off)
  98  * Purpose  : Turn the Powertec SCSI terminators on or off
  99  * Params   : host   - card to turn on/off
 100  *          : on_off - !0 to turn on, 0 to turn off
 101  */
 102 static void
 103 powertecscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
 104 {
 105         struct powertec_info *info = (struct powertec_info *)host->hostdata;
 106
 107         info->term_ctl = on_off ? POWERTEC_TERM_ENABLE : 0;
 108         writeb(info->term_ctl, info->base + POWERTEC_TERM_CONTROL);
 109 }
 110
 111 /* Prototype: void powertecscsi_intr(irq, *dev_id, *regs)
 112  * Purpose  : handle interrupts from Powertec SCSI card
 113  * Params   : irq    - interrupt number
 114  *            dev_id - user-defined (Scsi_Host structure)
 115  */
 116 static irqreturn_t powertecscsi_intr(int irq, void *dev_id)
 117 {
 118         struct powertec_info *info = dev_id;
 119
 120         return fas216_intr(&info->info);
 121 }
 122
 123 /* Prototype: fasdmatype_t powertecscsi_dma_setup(host, SCpnt, direction, min_type)
 124  * Purpose  : initialises DMA/PIO
 125  * Params   : host      - host
 126  *            SCpnt     - command
 127  *            direction - DMA on to/off of card
 128  *            min_type  - minimum DMA support that we must have for this transfer
 129  * Returns  : type of transfer to be performed
 130  */
 131 static fasdmatype_t
 132 powertecscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
 133                        fasdmadir_t direction, fasdmatype_t min_type)
 134 {
 135         struct powertec_info *info = (struct powertec_info *)host->hostdata;
 136         struct device *dev = scsi_get_device(host);
 137         int dmach = info->info.scsi.dma;
 138
 139         if (info->info.ifcfg.capabilities & FASCAP_DMA &&
 140             min_type == fasdma_real_all) {
 141                 int bufs, map_dir, dma_dir;
 142
 143                 bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
 144
 145                 if (direction == DMA_OUT)
 146                         map_dir = DMA_TO_DEVICE,
 147                         dma_dir = DMA_MODE_WRITE;
 148                 else
 149                         map_dir = DMA_FROM_DEVICE,
 150                         dma_dir = DMA_MODE_READ;
 151
 152                 dma_map_sg(dev, info->sg, bufs + 1, map_dir);
 153
 154                 disable_dma(dmach);
 155                 set_dma_sg(dmach, info->sg, bufs + 1);
 156                 set_dma_mode(dmach, dma_dir);
 157                 enable_dma(dmach);
 158                 return fasdma_real_all;
 159         }
 160
 161         /*
 162          * If we're not doing DMA,
 163          *  we'll do slow PIO
 164          */
 165         return fasdma_pio;
 166 }
 167
 168 /* Prototype: int powertecscsi_dma_stop(host, SCpnt)
 169  * Purpose  : stops DMA/PIO
 170  * Params   : host  - host
 171  *            SCpnt - command
 172  */
 173 static void
 174 powertecscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
 175 {
 176         struct powertec_info *info = (struct powertec_info *)host->hostdata;
 177         if (info->info.scsi.dma != NO_DMA)
 178                 disable_dma(info->info.scsi.dma);
 179 }
 180
 181 /* Prototype: const char *powertecscsi_info(struct Scsi_Host * host)
 182  * Purpose  : returns a descriptive string about this interface,
 183  * Params   : host - driver host structure to return info for.
 184  * Returns  : pointer to a static buffer containing null terminated string.
 185  */
 186 const char *powertecscsi_info(struct Scsi_Host *host)
 187 {
 188         struct powertec_info *info = (struct powertec_info *)host->hostdata;
 189         static char string[150];
 190
 191         sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
 192                 host->hostt->name, info->info.scsi.type, info->ec->slot_no,
 193                 VERSION, info->term_ctl ? "n" : "ff");
 194
 195         return string;
 196 }
 197
 198 /* Prototype: int powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
 199  * Purpose  : Set a driver specific function
 200  * Params   : host   - host to setup
 201  *          : buffer - buffer containing string describing operation
 202  *          : length - length of string
 203  * Returns  : -EINVAL, or 0
 204  */
 205 static int
 206 powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
 207 {
 208         int ret = length;
 209
 210         if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) {
 211                 buffer += 12;
 212                 length -= 12;
 213
 214                 if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
 215                         if (buffer[5] == '1')
 216                                 powertecscsi_terminator_ctl(host, 1);
 217                         else if (buffer[5] == '0')
 218                                 powertecscsi_terminator_ctl(host, 0);
 219                         else
 220                                 ret = -EINVAL;
 221                 } else
 222                         ret = -EINVAL;
 223         } else
 224                 ret = -EINVAL;
 225
 226         return ret;
 227 }
 228
 229 /* Prototype: int powertecscsi_proc_info(char *buffer, char **start, off_t offset,
 230  *                                      int length, int host_no, int inout)
 231  * Purpose  : Return information about the driver to a user process accessing
 232  *            the /proc filesystem.
 233  * Params   : buffer  - a buffer to write information to
 234  *            start   - a pointer into this buffer set by this routine to the start
 235  *                      of the required information.
 236  *            offset  - offset into information that we have read upto.
 237  *            length  - length of buffer
 238  *            inout   - 0 for reading, 1 for writing.
 239  * Returns  : length of data written to buffer.
 240  */
 241 int powertecscsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset,
 242                             int length, int inout)
 243 {
 244         struct powertec_info *info;
 245         char *p = buffer;
 246         int pos;
 247
 248         if (inout == 1)
 249                 return powertecscsi_set_proc_info(host, buffer, length);
 250
 251         info = (struct powertec_info *)host->hostdata;
 252
 253         p += sprintf(p, "PowerTec SCSI driver v%s\n", VERSION);
 254         p += fas216_print_host(&info->info, p);
 255         p += sprintf(p, "Term    : o%s\n",
 256                         info->term_ctl ? "n" : "ff");
 257
 258         p += fas216_print_stats(&info->info, p);
 259         p += fas216_print_devices(&info->info, p);
 260
 261         *start = buffer + offset;
 262         pos = p - buffer - offset;
 263         if (pos > length)
 264                 pos = length;
 265
 266         return pos;
 267 }
 268
 269 static ssize_t powertecscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf)
 270 {
 271         struct expansion_card *ec = ECARD_DEV(dev);
 272         struct Scsi_Host *host = ecard_get_drvdata(ec);
 273         struct powertec_info *info = (struct powertec_info *)host->hostdata;
 274
 275         return sprintf(buf, "%d\n", info->term_ctl ? 1 : 0);
 276 }
 277
 278 static ssize_t
 279 powertecscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
 280 {
 281         struct expansion_card *ec = ECARD_DEV(dev);
 282         struct Scsi_Host *host = ecard_get_drvdata(ec);
 283
 284         if (len > 1)
 285                 powertecscsi_terminator_ctl(host, buf[0] != '0');
 286
 287         return len;
 288 }
 289
 290 static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR,
 291                    powertecscsi_show_term, powertecscsi_store_term);
 292
 293 static struct scsi_host_template powertecscsi_template = {
 294         .module                         = THIS_MODULE,
 295         .proc_info                      = powertecscsi_proc_info,
 296         .name                           = "PowerTec SCSI",
 297         .info                           = powertecscsi_info,
 298         .queuecommand                   = fas216_queue_command,
 299         .eh_host_reset_handler          = fas216_eh_host_reset,
 300         .eh_bus_reset_handler           = fas216_eh_bus_reset,
 301         .eh_device_reset_handler        = fas216_eh_device_reset,
 302         .eh_abort_handler               = fas216_eh_abort,
 303
 304         .can_queue                      = 8,
 305         .this_id                        = 7,
 306         .sg_tablesize                   = SG_ALL,
 307         .cmd_per_lun                    = 2,
 308         .use_clustering                 = ENABLE_CLUSTERING,
 309         .proc_name                      = "powertec",
 310 };
 311
 312 static int __devinit
 313 powertecscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
 314 {
 315         struct Scsi_Host *host;
 316         struct powertec_info *info;
 317         unsigned long resbase, reslen;
 318         void __iomem *base;
 319         int ret;
 320
 321         ret = ecard_request_resources(ec);
 322         if (ret)
 323                 goto out;
 324
 325         resbase = ecard_resource_start(ec, ECARD_RES_IOCFAST);
 326         reslen = ecard_resource_len(ec, ECARD_RES_IOCFAST);
 327         base = ioremap(resbase, reslen);
 328         if (!base) {
 329                 ret = -ENOMEM;
 330                 goto out_region;
 331         }
 332
 333         host = scsi_host_alloc(&powertecscsi_template,
 334                                sizeof (struct powertec_info));
 335         if (!host) {
 336                 ret = -ENOMEM;
 337                 goto out_unmap;
 338         }
 339
 340         ecard_set_drvdata(ec, host);
 341
 342         info = (struct powertec_info *)host->hostdata;
 343         info->base = base;
 344         powertecscsi_terminator_ctl(host, term[ec->slot_no]);
 345
 346         info->info.scsi.io_base         = base + POWERTEC_FAS216_OFFSET;
 347         info->info.scsi.io_shift        = POWERTEC_FAS216_SHIFT;
 348         info->info.scsi.irq             = ec->irq;
 349         info->info.scsi.dma             = ec->dma;
 350         info->info.ifcfg.clockrate      = 40; /* MHz */
 351         info->info.ifcfg.select_timeout = 255;
 352         info->info.ifcfg.asyncperiod    = 200; /* ns */
 353         info->info.ifcfg.sync_max_depth = 7;
 354         info->info.ifcfg.cntl3          = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
 355         info->info.ifcfg.disconnect_ok  = 1;
 356         info->info.ifcfg.wide_max_size  = 0;
 357         info->info.ifcfg.capabilities   = 0;
 358         info->info.dma.setup            = powertecscsi_dma_setup;
 359         info->info.dma.pseudo           = NULL;
 360         info->info.dma.stop             = powertecscsi_dma_stop;
 361
 362         ec->irqaddr     = base + POWERTEC_INTR_STATUS;
 363         ec->irqmask     = POWERTEC_INTR_BIT;
 364         ec->irq_data    = info;
 365         ec->ops         = &powertecscsi_ops;
 366
 367         device_create_file(&ec->dev, &dev_attr_bus_term);
 368
 369         ret = fas216_init(host);
 370         if (ret)
 371                 goto out_free;
 372
 373         ret = request_irq(ec->irq, powertecscsi_intr,
 374                           IRQF_DISABLED, "powertec", info);
 375         if (ret) {
 376                 printk("scsi%d: IRQ%d not free: %d\n",
 377                        host->host_no, ec->irq, ret);
 378                 goto out_release;
 379         }
 380
 381         if (info->info.scsi.dma != NO_DMA) {
 382                 if (request_dma(info->info.scsi.dma, "powertec")) {
 383                         printk("scsi%d: DMA%d not free, using PIO\n",
 384                                host->host_no, info->info.scsi.dma);
 385                         info->info.scsi.dma = NO_DMA;
 386                 } else {
 387                         set_dma_speed(info->info.scsi.dma, 180);
 388                         info->info.ifcfg.capabilities |= FASCAP_DMA;
 389                 }
 390         }
 391
 392         ret = fas216_add(host, &ec->dev);
 393         if (ret == 0)
 394                 goto out;
 395
 396         if (info->info.scsi.dma != NO_DMA)
 397                 free_dma(info->info.scsi.dma);
 398         free_irq(ec->irq, host);
 399
 400  out_release:
 401         fas216_release(host);
 402
 403  out_free:
 404         device_remove_file(&ec->dev, &dev_attr_bus_term);
 405         scsi_host_put(host);
 406
 407  out_unmap:
 408         iounmap(base);
 409
 410  out_region:
 411         ecard_release_resources(ec);
 412
 413  out:
 414         return ret;
 415 }
 416
 417 static void __devexit powertecscsi_remove(struct expansion_card *ec)
 418 {
 419         struct Scsi_Host *host = ecard_get_drvdata(ec);
 420         struct powertec_info *info = (struct powertec_info *)host->hostdata;
 421
 422         ecard_set_drvdata(ec, NULL);
 423         fas216_remove(host);
 424
 425         device_remove_file(&ec->dev, &dev_attr_bus_term);
 426
 427         if (info->info.scsi.dma != NO_DMA)
 428                 free_dma(info->info.scsi.dma);
 429         free_irq(ec->irq, info);
 430
 431         iounmap(info->base);
 432
 433         fas216_release(host);
 434         scsi_host_put(host);
 435         ecard_release_resources(ec);
 436 }
 437
 438 static const struct ecard_id powertecscsi_cids[] = {
 439         { MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI },
 440         { 0xffff, 0xffff },
 441 };
 442
 443 static struct ecard_driver powertecscsi_driver = {
 444         .probe          = powertecscsi_probe,
 445         .remove         = __devexit_p(powertecscsi_remove),
 446         .id_table       = powertecscsi_cids,
 447         .drv = {
 448                 .name           = "powertecscsi",
 449         },
 450 };
 451
 452 static int __init powertecscsi_init(void)
 453 {
 454         return ecard_register_driver(&powertecscsi_driver);
 455 }
 456
 457 static void __exit powertecscsi_exit(void)
 458 {
 459         ecard_remove_driver(&powertecscsi_driver);
 460 }
 461
 462 module_init(powertecscsi_init);
 463 module_exit(powertecscsi_exit);
 464
 465 MODULE_AUTHOR("Russell King");
 466 MODULE_DESCRIPTION("Powertec SCSI driver");
 467 module_param_array(term, int, NULL, 0);
 468 MODULE_PARM_DESC(term, "SCSI bus termination");
 469 MODULE_LICENSE("GPL");