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/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  */
  55 static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
  56
  57 #define NR_SG   256
  58
  59 struct 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  */
  72 static void
  73 powertecscsi_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  */
  84 static void
  85 powertecscsi_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
  91 static 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  */
 101 static void
 102 powertecscsi_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  */
 115 static 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  */
 130 static fasdmatype_t
 131 powertecscsi_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  */
 172 static void
 173 powertecscsi_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  */
 185 const 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  */
 204 static int
 205 powertecscsi_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 upto.
 236  *            length  - length of buffer
 237  *            inout   - 0 for reading, 1 for writing.
 238  * Returns  : length of data written to buffer.
 239  */
 240 int powertecscsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset,
 241                             int length, int inout)
 242 {
 243         struct powertec_info *info;
 244         char *p = buffer;
 245         int pos;
 246
 247         if (inout == 1)
 248                 return powertecscsi_set_proc_info(host, buffer, length);
 249
 250         info = (struct powertec_info *)host->hostdata;
 251
 252         p += sprintf(p, "PowerTec SCSI driver v%s\n", VERSION);
 253         p += fas216_print_host(&info->info, p);
 254         p += sprintf(p, "Term    : o%s\n",
 255                         info->term_ctl ? "n" : "ff");
 256
 257         p += fas216_print_stats(&info->info, p);
 258         p += fas216_print_devices(&info->info, p);
 259
 260         *start = buffer + offset;
 261         pos = p - buffer - offset;
 262         if (pos > length)
 263                 pos = length;
 264
 265         return pos;
 266 }
 267
 268 static ssize_t powertecscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf)
 269 {
 270         struct expansion_card *ec = ECARD_DEV(dev);
 271         struct Scsi_Host *host = ecard_get_drvdata(ec);
 272         struct powertec_info *info = (struct powertec_info *)host->hostdata;
 273
 274         return sprintf(buf, "%d\n", info->term_ctl ? 1 : 0);
 275 }
 276
 277 static ssize_t
 278 powertecscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
 279 {
 280         struct expansion_card *ec = ECARD_DEV(dev);
 281         struct Scsi_Host *host = ecard_get_drvdata(ec);
 282
 283         if (len > 1)
 284                 powertecscsi_terminator_ctl(host, buf[0] != '0');
 285
 286         return len;
 287 }
 288
 289 static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR,
 290                    powertecscsi_show_term, powertecscsi_store_term);
 291
 292 static struct scsi_host_template powertecscsi_template = {
 293         .module                         = THIS_MODULE,
 294         .proc_info                      = powertecscsi_proc_info,
 295         .name                           = "PowerTec SCSI",
 296         .info                           = powertecscsi_info,
 297         .queuecommand                   = fas216_queue_command,
 298         .eh_host_reset_handler          = fas216_eh_host_reset,
 299         .eh_bus_reset_handler           = fas216_eh_bus_reset,
 300         .eh_device_reset_handler        = fas216_eh_device_reset,
 301         .eh_abort_handler               = fas216_eh_abort,
 302
 303         .can_queue                      = 8,
 304         .this_id                        = 7,
 305         .sg_tablesize                   = SCSI_MAX_SG_CHAIN_SEGMENTS,
 306         .dma_boundary                   = IOMD_DMA_BOUNDARY,
 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         void __iomem *base;
 318         int ret;
 319
 320         ret = ecard_request_resources(ec);
 321         if (ret)
 322                 goto out;
 323
 324         base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
 325         if (!base) {
 326                 ret = -ENOMEM;
 327                 goto out_region;
 328         }
 329
 330         host = scsi_host_alloc(&powertecscsi_template,
 331                                sizeof (struct powertec_info));
 332         if (!host) {
 333                 ret = -ENOMEM;
 334                 goto out_region;
 335         }
 336
 337         ecard_set_drvdata(ec, host);
 338
 339         info = (struct powertec_info *)host->hostdata;
 340         info->base = base;
 341         powertecscsi_terminator_ctl(host, term[ec->slot_no]);
 342
 343         info->ec = ec;
 344         info->info.scsi.io_base         = base + POWERTEC_FAS216_OFFSET;
 345         info->info.scsi.io_shift        = POWERTEC_FAS216_SHIFT;
 346         info->info.scsi.irq             = ec->irq;
 347         info->info.scsi.dma             = ec->dma;
 348         info->info.ifcfg.clockrate      = 40; /* MHz */
 349         info->info.ifcfg.select_timeout = 255;
 350         info->info.ifcfg.asyncperiod    = 200; /* ns */
 351         info->info.ifcfg.sync_max_depth = 7;
 352         info->info.ifcfg.cntl3          = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
 353         info->info.ifcfg.disconnect_ok  = 1;
 354         info->info.ifcfg.wide_max_size  = 0;
 355         info->info.ifcfg.capabilities   = 0;
 356         info->info.dma.setup            = powertecscsi_dma_setup;
 357         info->info.dma.pseudo           = NULL;
 358         info->info.dma.stop             = powertecscsi_dma_stop;
 359
 360         ec->irqaddr     = base + POWERTEC_INTR_STATUS;
 361         ec->irqmask     = POWERTEC_INTR_BIT;
 362
 363         ecard_setirq(ec, &powertecscsi_ops, info);
 364
 365         device_create_file(&ec->dev, &dev_attr_bus_term);
 366
 367         ret = fas216_init(host);
 368         if (ret)
 369                 goto out_free;
 370
 371         ret = request_irq(ec->irq, powertecscsi_intr,
 372                           IRQF_DISABLED, "powertec", info);
 373         if (ret) {
 374                 printk("scsi%d: IRQ%d not free: %d\n",
 375                        host->host_no, ec->irq, ret);
 376                 goto out_release;
 377         }
 378
 379         if (info->info.scsi.dma != NO_DMA) {
 380                 if (request_dma(info->info.scsi.dma, "powertec")) {
 381                         printk("scsi%d: DMA%d not free, using PIO\n",
 382                                host->host_no, info->info.scsi.dma);
 383                         info->info.scsi.dma = NO_DMA;
 384                 } else {
 385                         set_dma_speed(info->info.scsi.dma, 180);
 386                         info->info.ifcfg.capabilities |= FASCAP_DMA;
 387                 }
 388         }
 389
 390         ret = fas216_add(host, &ec->dev);
 391         if (ret == 0)
 392                 goto out;
 393
 394         if (info->info.scsi.dma != NO_DMA)
 395                 free_dma(info->info.scsi.dma);
 396         free_irq(ec->irq, host);
 397
 398  out_release:
 399         fas216_release(host);
 400
 401  out_free:
 402         device_remove_file(&ec->dev, &dev_attr_bus_term);
 403         scsi_host_put(host);
 404
 405  out_region:
 406         ecard_release_resources(ec);
 407
 408  out:
 409         return ret;
 410 }
 411
 412 static void __devexit powertecscsi_remove(struct expansion_card *ec)
 413 {
 414         struct Scsi_Host *host = ecard_get_drvdata(ec);
 415         struct powertec_info *info = (struct powertec_info *)host->hostdata;
 416
 417         ecard_set_drvdata(ec, NULL);
 418         fas216_remove(host);
 419
 420         device_remove_file(&ec->dev, &dev_attr_bus_term);
 421
 422         if (info->info.scsi.dma != NO_DMA)
 423                 free_dma(info->info.scsi.dma);
 424         free_irq(ec->irq, info);
 425
 426         fas216_release(host);
 427         scsi_host_put(host);
 428         ecard_release_resources(ec);
 429 }
 430
 431 static const struct ecard_id powertecscsi_cids[] = {
 432         { MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI },
 433         { 0xffff, 0xffff },
 434 };
 435
 436 static struct ecard_driver powertecscsi_driver = {
 437         .probe          = powertecscsi_probe,
 438         .remove         = __devexit_p(powertecscsi_remove),
 439         .id_table       = powertecscsi_cids,
 440         .drv = {
 441                 .name           = "powertecscsi",
 442         },
 443 };
 444
 445 static int __init powertecscsi_init(void)
 446 {
 447         return ecard_register_driver(&powertecscsi_driver);
 448 }
 449
 450 static void __exit powertecscsi_exit(void)
 451 {
 452         ecard_remove_driver(&powertecscsi_driver);
 453 }
 454
 455 module_init(powertecscsi_init);
 456 module_exit(powertecscsi_exit);
 457
 458 MODULE_AUTHOR("Russell King");
 459 MODULE_DESCRIPTION("Powertec SCSI driver");
 460 module_param_array(term, int, NULL, 0);
 461 MODULE_PARM_DESC(term, "SCSI bus termination");
 462 MODULE_LICENSE("GPL");