drivers/scsi/dec_esp.c

   1 /*
   2  * dec_esp.c: Driver for SCSI chips on IOASIC based TURBOchannel DECstations
   3  *            and TURBOchannel PMAZ-A cards
   4  *
   5  * TURBOchannel changes by Harald Koerfgen
   6  * PMAZ-A support by David Airlie
   7  *
   8  * based on jazz_esp.c:
   9  * Copyright (C) 1997 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
  10  *
  11  * jazz_esp is based on David S. Miller's ESP driver and cyber_esp
  12  *
  13  * 20000819 - Small PMAZ-AA fixes by Florian Lohoff <flo@rfc822.org>
  14  *            Be warned the PMAZ-AA works currently as a single card.
  15  *            Dont try to put multiple cards in one machine - They are
  16  *            both detected but it may crash under high load garbling your
  17  *            data.
  18  * 20001005     - Initialization fixes for 2.4.0-test9
  19  *                        Florian Lohoff <flo@rfc822.org>
  20  *
  21  *      Copyright (C) 2002, 2003, 2005, 2006  Maciej W. Rozycki
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/delay.h>
  26 #include <linux/types.h>
  27 #include <linux/string.h>
  28 #include <linux/slab.h>
  29 #include <linux/blkdev.h>
  30 #include <linux/proc_fs.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/stat.h>
  33 #include <linux/tc.h>
  34
  35 #include <asm/dma.h>
  36 #include <asm/irq.h>
  37 #include <asm/pgtable.h>
  38 #include <asm/system.h>
  39
  40 #include <asm/dec/interrupts.h>
  41 #include <asm/dec/ioasic.h>
  42 #include <asm/dec/ioasic_addrs.h>
  43 #include <asm/dec/ioasic_ints.h>
  44 #include <asm/dec/machtype.h>
  45 #include <asm/dec/system.h>
  46
  47 #define DEC_SCSI_SREG 0
  48 #define DEC_SCSI_DMAREG 0x40000
  49 #define DEC_SCSI_SRAM 0x80000
  50 #define DEC_SCSI_DIAG 0xC0000
  51
  52 #include "scsi.h"
  53 #include <scsi/scsi_host.h>
  54 #include "NCR53C9x.h"
  55
  56 static int  dma_bytes_sent(struct NCR_ESP *esp, int fifo_count);
  57 static void dma_drain(struct NCR_ESP *esp);
  58 static int  dma_can_transfer(struct NCR_ESP *esp, struct scsi_cmnd *sp);
  59 static void dma_dump_state(struct NCR_ESP *esp);
  60 static void dma_init_read(struct NCR_ESP *esp, u32 vaddress, int length);
  61 static void dma_init_write(struct NCR_ESP *esp, u32 vaddress, int length);
  62 static void dma_ints_off(struct NCR_ESP *esp);
  63 static void dma_ints_on(struct NCR_ESP *esp);
  64 static int  dma_irq_p(struct NCR_ESP *esp);
  65 static int  dma_ports_p(struct NCR_ESP *esp);
  66 static void dma_setup(struct NCR_ESP *esp, u32 addr, int count, int write);
  67 static void dma_mmu_get_scsi_one(struct NCR_ESP *esp, struct scsi_cmnd * sp);
  68 static void dma_mmu_get_scsi_sgl(struct NCR_ESP *esp, struct scsi_cmnd * sp);
  69 static void dma_advance_sg(struct scsi_cmnd * sp);
  70
  71 static void pmaz_dma_drain(struct NCR_ESP *esp);
  72 static void pmaz_dma_init_read(struct NCR_ESP *esp, u32 vaddress, int length);
  73 static void pmaz_dma_init_write(struct NCR_ESP *esp, u32 vaddress, int length);
  74 static void pmaz_dma_ints_off(struct NCR_ESP *esp);
  75 static void pmaz_dma_ints_on(struct NCR_ESP *esp);
  76 static void pmaz_dma_setup(struct NCR_ESP *esp, u32 addr, int count, int write);
  77 static void pmaz_dma_mmu_get_scsi_one(struct NCR_ESP *esp, struct scsi_cmnd * sp);
  78
  79 #define TC_ESP_RAM_SIZE 0x20000
  80 #define ESP_TGT_DMA_SIZE ((TC_ESP_RAM_SIZE/7) & ~(sizeof(int)-1))
  81 #define ESP_NCMD 7
  82
  83 #define TC_ESP_DMAR_MASK  0x1ffff
  84 #define TC_ESP_DMAR_WRITE 0x80000000
  85 #define TC_ESP_DMA_ADDR(x) ((unsigned)(x) & TC_ESP_DMAR_MASK)
  86
  87 u32 esp_virt_buffer;
  88 int scsi_current_length;
  89
  90 volatile unsigned char cmd_buffer[16];
  91 volatile unsigned char pmaz_cmd_buffer[16];
  92                                 /* This is where all commands are put
  93                                  * before they are trasfered to the ESP chip
  94                                  * via PIO.
  95                                  */
  96
  97 static irqreturn_t scsi_dma_merr_int(int, void *);
  98 static irqreturn_t scsi_dma_err_int(int, void *);
  99 static irqreturn_t scsi_dma_int(int, void *);
 100
 101 static struct scsi_host_template dec_esp_template = {
 102         .module                 = THIS_MODULE,
 103         .name                   = "NCR53C94",
 104         .info                   = esp_info,
 105         .queuecommand           = esp_queue,
 106         .eh_abort_handler       = esp_abort,
 107         .eh_bus_reset_handler   = esp_reset,
 108         .slave_alloc            = esp_slave_alloc,
 109         .slave_destroy          = esp_slave_destroy,
 110         .proc_info              = esp_proc_info,
 111         .proc_name              = "dec_esp",
 112         .can_queue              = 7,
 113         .sg_tablesize           = SG_ALL,
 114         .cmd_per_lun            = 1,
 115         .use_clustering         = DISABLE_CLUSTERING,
 116 };
 117
 118 static struct NCR_ESP *dec_esp_platform;
 119
 120 /***************************************************************** Detection */
 121 static int dec_esp_platform_probe(void)
 122 {
 123         struct NCR_ESP *esp;
 124         int err = 0;
 125
 126         if (IOASIC) {
 127                 esp = esp_allocate(&dec_esp_template, NULL, 1);
 128
 129                 /* Do command transfer with programmed I/O */
 130                 esp->do_pio_cmds = 1;
 131
 132                 /* Required functions */
 133                 esp->dma_bytes_sent = &dma_bytes_sent;
 134                 esp->dma_can_transfer = &dma_can_transfer;
 135                 esp->dma_dump_state = &dma_dump_state;
 136                 esp->dma_init_read = &dma_init_read;
 137                 esp->dma_init_write = &dma_init_write;
 138                 esp->dma_ints_off = &dma_ints_off;
 139                 esp->dma_ints_on = &dma_ints_on;
 140                 esp->dma_irq_p = &dma_irq_p;
 141                 esp->dma_ports_p = &dma_ports_p;
 142                 esp->dma_setup = &dma_setup;
 143
 144                 /* Optional functions */
 145                 esp->dma_barrier = 0;
 146                 esp->dma_drain = &dma_drain;
 147                 esp->dma_invalidate = 0;
 148                 esp->dma_irq_entry = 0;
 149                 esp->dma_irq_exit = 0;
 150                 esp->dma_poll = 0;
 151                 esp->dma_reset = 0;
 152                 esp->dma_led_off = 0;
 153                 esp->dma_led_on = 0;
 154
 155                 /* virtual DMA functions */
 156                 esp->dma_mmu_get_scsi_one = &dma_mmu_get_scsi_one;
 157                 esp->dma_mmu_get_scsi_sgl = &dma_mmu_get_scsi_sgl;
 158                 esp->dma_mmu_release_scsi_one = 0;
 159                 esp->dma_mmu_release_scsi_sgl = 0;
 160                 esp->dma_advance_sg = &dma_advance_sg;
 161
 162
 163                 /* SCSI chip speed */
 164                 esp->cfreq = 25000000;
 165
 166                 esp->dregs = 0;
 167
 168                 /* ESP register base */
 169                 esp->eregs = (void *)CKSEG1ADDR(dec_kn_slot_base +
 170                                                 IOASIC_SCSI);
 171
 172                 /* Set the command buffer */
 173                 esp->esp_command = (volatile unsigned char *) cmd_buffer;
 174
 175                 /* get virtual dma address for command buffer */
 176                 esp->esp_command_dvma = virt_to_phys(cmd_buffer);
 177
 178                 esp->irq = dec_interrupt[DEC_IRQ_ASC];
 179
 180                 esp->scsi_id = 7;
 181
 182                 /* Check for differential SCSI-bus */
 183                 esp->diff = 0;
 184
 185                 err = request_irq(esp->irq, esp_intr, IRQF_DISABLED,
 186                                   "ncr53c94", esp->ehost);
 187                 if (err)
 188                         goto err_alloc;
 189                 err = request_irq(dec_interrupt[DEC_IRQ_ASC_MERR],
 190                                   scsi_dma_merr_int, IRQF_DISABLED,
 191                                   "ncr53c94 error", esp->ehost);
 192                 if (err)
 193                         goto err_irq;
 194                 err = request_irq(dec_interrupt[DEC_IRQ_ASC_ERR],
 195                                   scsi_dma_err_int, IRQF_DISABLED,
 196                                   "ncr53c94 overrun", esp->ehost);
 197                 if (err)
 198                         goto err_irq_merr;
 199                 err = request_irq(dec_interrupt[DEC_IRQ_ASC_DMA], scsi_dma_int,
 200                                   IRQF_DISABLED, "ncr53c94 dma", esp->ehost);
 201                 if (err)
 202                         goto err_irq_err;
 203
 204                 esp_initialize(esp);
 205
 206                 err = scsi_add_host(esp->ehost, NULL);
 207                 if (err) {
 208                         printk(KERN_ERR "ESP: Unable to register adapter\n");
 209                         goto err_irq_dma;
 210                 }
 211
 212                 scsi_scan_host(esp->ehost);
 213
 214                 dec_esp_platform = esp;
 215         }
 216
 217         return 0;
 218
 219 err_irq_dma:
 220         free_irq(dec_interrupt[DEC_IRQ_ASC_DMA], esp->ehost);
 221 err_irq_err:
 222         free_irq(dec_interrupt[DEC_IRQ_ASC_ERR], esp->ehost);
 223 err_irq_merr:
 224         free_irq(dec_interrupt[DEC_IRQ_ASC_MERR], esp->ehost);
 225 err_irq:
 226         free_irq(esp->irq, esp->ehost);
 227 err_alloc:
 228         esp_deallocate(esp);
 229         scsi_host_put(esp->ehost);
 230         return err;
 231 }
 232
 233 static int __init dec_esp_probe(struct device *dev)
 234 {
 235         struct NCR_ESP *esp;
 236         resource_size_t start, len;
 237         int err;
 238
 239         esp = esp_allocate(&dec_esp_template,  NULL, 1);
 240
 241         dev_set_drvdata(dev, esp);
 242
 243         start = to_tc_dev(dev)->resource.start;
 244         len = to_tc_dev(dev)->resource.end - start + 1;
 245
 246         if (!request_mem_region(start, len, dev->bus_id)) {
 247                 printk(KERN_ERR "%s: Unable to reserve MMIO resource\n",
 248                        dev->bus_id);
 249                 err = -EBUSY;
 250                 goto err_alloc;
 251         }
 252
 253         /* Store base addr into esp struct.  */
 254         esp->slot = start;
 255
 256         esp->dregs = 0;
 257         esp->eregs = (void *)CKSEG1ADDR(start + DEC_SCSI_SREG);
 258         esp->do_pio_cmds = 1;
 259
 260         /* Set the command buffer.  */
 261         esp->esp_command = (volatile unsigned char *)pmaz_cmd_buffer;
 262
 263         /* Get virtual dma address for command buffer.  */
 264         esp->esp_command_dvma = virt_to_phys(pmaz_cmd_buffer);
 265
 266         esp->cfreq = tc_get_speed(to_tc_dev(dev)->bus);
 267
 268         esp->irq = to_tc_dev(dev)->interrupt;
 269
 270         /* Required functions.  */
 271         esp->dma_bytes_sent = &dma_bytes_sent;
 272         esp->dma_can_transfer = &dma_can_transfer;
 273         esp->dma_dump_state = &dma_dump_state;
 274         esp->dma_init_read = &pmaz_dma_init_read;
 275         esp->dma_init_write = &pmaz_dma_init_write;
 276         esp->dma_ints_off = &pmaz_dma_ints_off;
 277         esp->dma_ints_on = &pmaz_dma_ints_on;
 278         esp->dma_irq_p = &dma_irq_p;
 279         esp->dma_ports_p = &dma_ports_p;
 280         esp->dma_setup = &pmaz_dma_setup;
 281
 282         /* Optional functions.  */
 283         esp->dma_barrier = 0;
 284         esp->dma_drain = &pmaz_dma_drain;
 285         esp->dma_invalidate = 0;
 286         esp->dma_irq_entry = 0;
 287         esp->dma_irq_exit = 0;
 288         esp->dma_poll = 0;
 289         esp->dma_reset = 0;
 290         esp->dma_led_off = 0;
 291         esp->dma_led_on = 0;
 292
 293         esp->dma_mmu_get_scsi_one = pmaz_dma_mmu_get_scsi_one;
 294         esp->dma_mmu_get_scsi_sgl = 0;
 295         esp->dma_mmu_release_scsi_one = 0;
 296         esp->dma_mmu_release_scsi_sgl = 0;
 297         esp->dma_advance_sg = 0;
 298
 299         err = request_irq(esp->irq, esp_intr, IRQF_DISABLED, "PMAZ_AA",
 300                           esp->ehost);
 301         if (err) {
 302                 printk(KERN_ERR "%s: Unable to get IRQ %d\n",
 303                        dev->bus_id, esp->irq);
 304                 goto err_resource;
 305         }
 306
 307         esp->scsi_id = 7;
 308         esp->diff = 0;
 309         esp_initialize(esp);
 310
 311         err = scsi_add_host(esp->ehost, dev);
 312         if (err) {
 313                 printk(KERN_ERR "%s: Unable to register adapter\n",
 314                        dev->bus_id);
 315                 goto err_irq;
 316         }
 317
 318         scsi_scan_host(esp->ehost);
 319
 320         return 0;
 321
 322 err_irq:
 323         free_irq(esp->irq, esp->ehost);
 324
 325 err_resource:
 326         release_mem_region(start, len);
 327
 328 err_alloc:
 329         esp_deallocate(esp);
 330         scsi_host_put(esp->ehost);
 331         return err;
 332 }
 333
 334 static void __exit dec_esp_platform_remove(void)
 335 {
 336         struct NCR_ESP *esp = dec_esp_platform;
 337
 338         free_irq(esp->irq, esp->ehost);
 339         esp_deallocate(esp);
 340         scsi_host_put(esp->ehost);
 341         dec_esp_platform = NULL;
 342 }
 343
 344 static void __exit dec_esp_remove(struct device *dev)
 345 {
 346         struct NCR_ESP *esp = dev_get_drvdata(dev);
 347
 348         free_irq(esp->irq, esp->ehost);
 349         esp_deallocate(esp);
 350         scsi_host_put(esp->ehost);
 351 }
 352
 353
 354 /************************************************************* DMA Functions */
 355 static irqreturn_t scsi_dma_merr_int(int irq, void *dev_id)
 356 {
 357         printk("Got unexpected SCSI DMA Interrupt! < ");
 358         printk("SCSI_DMA_MEMRDERR ");
 359         printk(">\n");
 360
 361         return IRQ_HANDLED;
 362 }
 363
 364 static irqreturn_t scsi_dma_err_int(int irq, void *dev_id)
 365 {
 366         /* empty */
 367
 368         return IRQ_HANDLED;
 369 }
 370
 371 static irqreturn_t scsi_dma_int(int irq, void *dev_id)
 372 {
 373         u32 scsi_next_ptr;
 374
 375         scsi_next_ptr = ioasic_read(IO_REG_SCSI_DMA_P);
 376
 377         /* next page */
 378         scsi_next_ptr = (((scsi_next_ptr >> 3) + PAGE_SIZE) & PAGE_MASK) << 3;
 379         ioasic_write(IO_REG_SCSI_DMA_BP, scsi_next_ptr);
 380         fast_iob();
 381
 382         return IRQ_HANDLED;
 383 }
 384
 385 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
 386 {
 387         return fifo_count;
 388 }
 389
 390 static void dma_drain(struct NCR_ESP *esp)
 391 {
 392         u32 nw, data0, data1, scsi_data_ptr;
 393         u16 *p;
 394
 395         nw = ioasic_read(IO_REG_SCSI_SCR);
 396
 397         /*
 398          * Is there something in the dma buffers left?
 399          */
 400         if (nw) {
 401                 scsi_data_ptr = ioasic_read(IO_REG_SCSI_DMA_P) >> 3;
 402                 p = phys_to_virt(scsi_data_ptr);
 403                 switch (nw) {
 404                 case 1:
 405                         data0 = ioasic_read(IO_REG_SCSI_SDR0);
 406                         p[0] = data0 & 0xffff;
 407                         break;
 408                 case 2:
 409                         data0 = ioasic_read(IO_REG_SCSI_SDR0);
 410                         p[0] = data0 & 0xffff;
 411                         p[1] = (data0 >> 16) & 0xffff;
 412                         break;
 413                 case 3:
 414                         data0 = ioasic_read(IO_REG_SCSI_SDR0);
 415                         data1 = ioasic_read(IO_REG_SCSI_SDR1);
 416                         p[0] = data0 & 0xffff;
 417                         p[1] = (data0 >> 16) & 0xffff;
 418                         p[2] = data1 & 0xffff;
 419                         break;
 420                 default:
 421                         printk("Strange: %d words in dma buffer left\n", nw);
 422                         break;
 423                 }
 424         }
 425 }
 426
 427 static int dma_can_transfer(struct NCR_ESP *esp, struct scsi_cmnd * sp)
 428 {
 429         return sp->SCp.this_residual;
 430 }
 431
 432 static void dma_dump_state(struct NCR_ESP *esp)
 433 {
 434 }
 435
 436 static void dma_init_read(struct NCR_ESP *esp, u32 vaddress, int length)
 437 {
 438         u32 scsi_next_ptr, ioasic_ssr;
 439         unsigned long flags;
 440
 441         if (vaddress & 3)
 442                 panic("dec_esp.c: unable to handle partial word transfers, yet...");
 443
 444         dma_cache_wback_inv((unsigned long) phys_to_virt(vaddress), length);
 445
 446         spin_lock_irqsave(&ioasic_ssr_lock, flags);
 447
 448         fast_mb();
 449         ioasic_ssr = ioasic_read(IO_REG_SSR);
 450
 451         ioasic_ssr &= ~IO_SSR_SCSI_DMA_EN;
 452         ioasic_write(IO_REG_SSR, ioasic_ssr);
 453
 454         fast_wmb();
 455         ioasic_write(IO_REG_SCSI_SCR, 0);
 456         ioasic_write(IO_REG_SCSI_DMA_P, vaddress << 3);
 457
 458         /* prepare for next page */
 459         scsi_next_ptr = ((vaddress + PAGE_SIZE) & PAGE_MASK) << 3;
 460         ioasic_write(IO_REG_SCSI_DMA_BP, scsi_next_ptr);
 461
 462         ioasic_ssr |= (IO_SSR_SCSI_DMA_DIR | IO_SSR_SCSI_DMA_EN);
 463         fast_wmb();
 464         ioasic_write(IO_REG_SSR, ioasic_ssr);
 465
 466         fast_iob();
 467         spin_unlock_irqrestore(&ioasic_ssr_lock, flags);
 468 }
 469
 470 static void dma_init_write(struct NCR_ESP *esp, u32 vaddress, int length)
 471 {
 472         u32 scsi_next_ptr, ioasic_ssr;
 473         unsigned long flags;
 474
 475         if (vaddress & 3)
 476                 panic("dec_esp.c: unable to handle partial word transfers, yet...");
 477
 478         dma_cache_wback_inv((unsigned long) phys_to_virt(vaddress), length);
 479
 480         spin_lock_irqsave(&ioasic_ssr_lock, flags);
 481
 482         fast_mb();
 483         ioasic_ssr = ioasic_read(IO_REG_SSR);
 484
 485         ioasic_ssr &= ~(IO_SSR_SCSI_DMA_DIR | IO_SSR_SCSI_DMA_EN);
 486         ioasic_write(IO_REG_SSR, ioasic_ssr);
 487
 488         fast_wmb();
 489         ioasic_write(IO_REG_SCSI_SCR, 0);
 490         ioasic_write(IO_REG_SCSI_DMA_P, vaddress << 3);
 491
 492         /* prepare for next page */
 493         scsi_next_ptr = ((vaddress + PAGE_SIZE) & PAGE_MASK) << 3;
 494         ioasic_write(IO_REG_SCSI_DMA_BP, scsi_next_ptr);
 495
 496         ioasic_ssr |= IO_SSR_SCSI_DMA_EN;
 497         fast_wmb();
 498         ioasic_write(IO_REG_SSR, ioasic_ssr);
 499
 500         fast_iob();
 501         spin_unlock_irqrestore(&ioasic_ssr_lock, flags);
 502 }
 503
 504 static void dma_ints_off(struct NCR_ESP *esp)
 505 {
 506         disable_irq(dec_interrupt[DEC_IRQ_ASC_DMA]);
 507 }
 508
 509 static void dma_ints_on(struct NCR_ESP *esp)
 510 {
 511         enable_irq(dec_interrupt[DEC_IRQ_ASC_DMA]);
 512 }
 513
 514 static int dma_irq_p(struct NCR_ESP *esp)
 515 {
 516         return (esp->eregs->esp_status & ESP_STAT_INTR);
 517 }
 518
 519 static int dma_ports_p(struct NCR_ESP *esp)
 520 {
 521         /*
 522          * FIXME: what's this good for?
 523          */
 524         return 1;
 525 }
 526
 527 static void dma_setup(struct NCR_ESP *esp, u32 addr, int count, int write)
 528 {
 529         /*
 530          * DMA_ST_WRITE means "move data from device to memory"
 531          * so when (write) is true, it actually means READ!
 532          */
 533         if (write)
 534                 dma_init_read(esp, addr, count);
 535         else
 536                 dma_init_write(esp, addr, count);
 537 }
 538
 539 static void dma_mmu_get_scsi_one(struct NCR_ESP *esp, struct scsi_cmnd * sp)
 540 {
 541         sp->SCp.ptr = (char *)virt_to_phys(sp->request_buffer);
 542 }
 543
 544 static void dma_mmu_get_scsi_sgl(struct NCR_ESP *esp, struct scsi_cmnd * sp)
 545 {
 546         int sz = sp->SCp.buffers_residual;
 547         struct scatterlist *sg = sp->SCp.buffer;
 548
 549         while (sz >= 0) {
 550                 sg[sz].dma_address = page_to_phys(sg[sz].page) + sg[sz].offset;
 551                 sz--;
 552         }
 553         sp->SCp.ptr = (char *)(sp->SCp.buffer->dma_address);
 554 }
 555
 556 static void dma_advance_sg(struct scsi_cmnd * sp)
 557 {
 558         sp->SCp.ptr = (char *)(sp->SCp.buffer->dma_address);
 559 }
 560
 561 static void pmaz_dma_drain(struct NCR_ESP *esp)
 562 {
 563         memcpy(phys_to_virt(esp_virt_buffer),
 564                (void *)CKSEG1ADDR(esp->slot + DEC_SCSI_SRAM +
 565                                   ESP_TGT_DMA_SIZE),
 566                scsi_current_length);
 567 }
 568
 569 static void pmaz_dma_init_read(struct NCR_ESP *esp, u32 vaddress, int length)
 570 {
 571         volatile u32 *dmareg =
 572                 (volatile u32 *)CKSEG1ADDR(esp->slot + DEC_SCSI_DMAREG);
 573
 574         if (length > ESP_TGT_DMA_SIZE)
 575                 length = ESP_TGT_DMA_SIZE;
 576
 577         *dmareg = TC_ESP_DMA_ADDR(ESP_TGT_DMA_SIZE);
 578
 579         iob();
 580
 581         esp_virt_buffer = vaddress;
 582         scsi_current_length = length;
 583 }
 584
 585 static void pmaz_dma_init_write(struct NCR_ESP *esp, u32 vaddress, int length)
 586 {
 587         volatile u32 *dmareg =
 588                 (volatile u32 *)CKSEG1ADDR(esp->slot + DEC_SCSI_DMAREG);
 589
 590         memcpy((void *)CKSEG1ADDR(esp->slot + DEC_SCSI_SRAM +
 591                                   ESP_TGT_DMA_SIZE),
 592                phys_to_virt(vaddress), length);
 593
 594         wmb();
 595         *dmareg = TC_ESP_DMAR_WRITE | TC_ESP_DMA_ADDR(ESP_TGT_DMA_SIZE);
 596
 597         iob();
 598 }
 599
 600 static void pmaz_dma_ints_off(struct NCR_ESP *esp)
 601 {
 602 }
 603
 604 static void pmaz_dma_ints_on(struct NCR_ESP *esp)
 605 {
 606 }
 607
 608 static void pmaz_dma_setup(struct NCR_ESP *esp, u32 addr, int count, int write)
 609 {
 610         /*
 611          * DMA_ST_WRITE means "move data from device to memory"
 612          * so when (write) is true, it actually means READ!
 613          */
 614         if (write)
 615                 pmaz_dma_init_read(esp, addr, count);
 616         else
 617                 pmaz_dma_init_write(esp, addr, count);
 618 }
 619
 620 static void pmaz_dma_mmu_get_scsi_one(struct NCR_ESP *esp, struct scsi_cmnd * sp)
 621 {
 622         sp->SCp.ptr = (char *)virt_to_phys(sp->request_buffer);
 623 }
 624
 625
 626 #ifdef CONFIG_TC
 627 static int __init dec_esp_tc_probe(struct device *dev);
 628 static int __exit dec_esp_tc_remove(struct device *dev);
 629
 630 static const struct tc_device_id dec_esp_tc_table[] = {
 631         { "DEC     ", "PMAZ-AA " },
 632         { }
 633 };
 634 MODULE_DEVICE_TABLE(tc, dec_esp_tc_table);
 635
 636 static struct tc_driver dec_esp_tc_driver = {
 637         .id_table       = dec_esp_tc_table,
 638         .driver         = {
 639                 .name   = "dec_esp",
 640                 .bus    = &tc_bus_type,
 641                 .probe  = dec_esp_tc_probe,
 642                 .remove = __exit_p(dec_esp_tc_remove),
 643         },
 644 };
 645
 646 static int __init dec_esp_tc_probe(struct device *dev)
 647 {
 648         int status = dec_esp_probe(dev);
 649         if (!status)
 650                 get_device(dev);
 651         return status;
 652 }
 653
 654 static int __exit dec_esp_tc_remove(struct device *dev)
 655 {
 656         put_device(dev);
 657         dec_esp_remove(dev);
 658         return 0;
 659 }
 660 #endif
 661
 662 static int __init dec_esp_init(void)
 663 {
 664         int status;
 665
 666         status = tc_register_driver(&dec_esp_tc_driver);
 667         if (!status)
 668                 dec_esp_platform_probe();
 669
 670         if (nesps) {
 671                 pr_info("ESP: Total of %d ESP hosts found, "
 672                         "%d actually in use.\n", nesps, esps_in_use);
 673                 esps_running = esps_in_use;
 674         }
 675
 676         return status;
 677 }
 678
 679 static void __exit dec_esp_exit(void)
 680 {
 681         dec_esp_platform_remove();
 682         tc_unregister_driver(&dec_esp_tc_driver);
 683 }
 684
 685
 686 module_init(dec_esp_init);
 687 module_exit(dec_esp_exit);