drivers/scsi/fastlane.c

   1 /* fastlane.c: Driver for Phase5's Fastlane SCSI Controller.
   2  *
   3  * Copyright (C) 1996 Jesper Skov (jskov@cygnus.co.uk)
   4  *
   5  * This driver is based on the CyberStorm driver, hence the occasional
   6  * reference to CyberStorm.
   7  *
   8  * Betatesting & crucial adjustments by
   9  *        Patrik Rak (prak3264@ss1000.ms.mff.cuni.cz)
  10  *
  11  */
  12
  13 /* TODO:
  14  *
  15  * o According to the doc from laire, it is required to reset the DMA when
  16  *   the transfer is done. ATM we reset DMA just before every new
  17  *   dma_init_(read|write).
  18  *
  19  * 1) Figure out how to make a cleaner merge with the sparc driver with regard
  20  *    to the caches and the Sparc MMU mapping.
  21  * 2) Make as few routines required outside the generic driver. A lot of the
  22  *    routines in this file used to be inline!
  23  */
  24
  25 #include <linux/module.h>
  26
  27 #include <linux/init.h>
  28 #include <linux/kernel.h>
  29 #include <linux/delay.h>
  30 #include <linux/types.h>
  31 #include <linux/string.h>
  32 #include <linux/slab.h>
  33 #include <linux/blkdev.h>
  34 #include <linux/proc_fs.h>
  35 #include <linux/stat.h>
  36 #include <linux/interrupt.h>
  37
  38 #include "scsi.h"
  39 #include <scsi/scsi_host.h>
  40 #include "NCR53C9x.h"
  41
  42 #include <linux/zorro.h>
  43 #include <asm/irq.h>
  44
  45 #include <asm/amigaints.h>
  46 #include <asm/amigahw.h>
  47
  48 #include <asm/pgtable.h>
  49
  50 /* Such day has just come... */
  51 #if 0
  52 /* Let this defined unless you really need to enable DMA IRQ one day */
  53 #define NODMAIRQ
  54 #endif
  55
  56 /* The controller registers can be found in the Z2 config area at these
  57  * offsets:
  58  */
  59 #define FASTLANE_ESP_ADDR 0x1000001
  60 #define FASTLANE_DMA_ADDR 0x1000041
  61
  62
  63 /* The Fastlane DMA interface */
  64 struct fastlane_dma_registers {
  65         volatile unsigned char cond_reg;        /* DMA status  (ro) [0x0000] */
  66 #define ctrl_reg  cond_reg                      /* DMA control (wo) [0x0000] */
  67         unsigned char dmapad1[0x3f];
  68         volatile unsigned char clear_strobe;    /* DMA clear   (wo) [0x0040] */
  69 };
  70
  71
  72 /* DMA status bits */
  73 #define FASTLANE_DMA_MINT  0x80
  74 #define FASTLANE_DMA_IACT  0x40
  75 #define FASTLANE_DMA_CREQ  0x20
  76
  77 /* DMA control bits */
  78 #define FASTLANE_DMA_FCODE 0xa0
  79 #define FASTLANE_DMA_MASK  0xf3
  80 #define FASTLANE_DMA_LED   0x10 /* HD led control 1 = on */
  81 #define FASTLANE_DMA_WRITE 0x08 /* 1 = write */
  82 #define FASTLANE_DMA_ENABLE 0x04 /* Enable DMA */
  83 #define FASTLANE_DMA_EDI   0x02 /* Enable DMA IRQ ? */
  84 #define FASTLANE_DMA_ESI   0x01 /* Enable SCSI IRQ */
  85
  86 static int  dma_bytes_sent(struct NCR_ESP *esp, int fifo_count);
  87 static int  dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp);
  88 static void dma_dump_state(struct NCR_ESP *esp);
  89 static void dma_init_read(struct NCR_ESP *esp, __u32 addr, int length);
  90 static void dma_init_write(struct NCR_ESP *esp, __u32 vaddr, int length);
  91 static void dma_ints_off(struct NCR_ESP *esp);
  92 static void dma_ints_on(struct NCR_ESP *esp);
  93 static int  dma_irq_p(struct NCR_ESP *esp);
  94 static void dma_irq_exit(struct NCR_ESP *esp);
  95 static void dma_led_off(struct NCR_ESP *esp);
  96 static void dma_led_on(struct NCR_ESP *esp);
  97 static int  dma_ports_p(struct NCR_ESP *esp);
  98 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write);
  99
 100 static unsigned char ctrl_data = 0;     /* Keep backup of the stuff written
 101                                  * to ctrl_reg. Always write a copy
 102                                  * to this register when writing to
 103                                  * the hardware register!
 104                                  */
 105
 106 static volatile unsigned char cmd_buffer[16];
 107                                 /* This is where all commands are put
 108                                  * before they are transferred to the ESP chip
 109                                  * via PIO.
 110                                  */
 111
 112 static inline void dma_clear(struct NCR_ESP *esp)
 113 {
 114         struct fastlane_dma_registers *dregs =
 115                 (struct fastlane_dma_registers *) (esp->dregs);
 116         unsigned long *t;
 117
 118         ctrl_data = (ctrl_data & FASTLANE_DMA_MASK);
 119         dregs->ctrl_reg = ctrl_data;
 120
 121         t = (unsigned long *)(esp->edev);
 122
 123         dregs->clear_strobe = 0;
 124         *t = 0 ;
 125 }
 126
 127 /***************************************************************** Detection */
 128 int __init fastlane_esp_detect(struct scsi_host_template *tpnt)
 129 {
 130         struct NCR_ESP *esp;
 131         struct zorro_dev *z = NULL;
 132         unsigned long address;
 133
 134         if ((z = zorro_find_device(ZORRO_PROD_PHASE5_BLIZZARD_1230_II_FASTLANE_Z3_CYBERSCSI_CYBERSTORM060, z))) {
 135             unsigned long board = z->resource.start;
 136             if (request_mem_region(board+FASTLANE_ESP_ADDR,
 137                                    sizeof(struct ESP_regs), "NCR53C9x")) {
 138                 /* Check if this is really a fastlane controller. The problem
 139                  * is that also the cyberstorm and blizzard controllers use
 140                  * this ID value. Fortunately only Fastlane maps in Z3 space
 141                  */
 142                 if (board < 0x1000000) {
 143                         goto err_release;
 144                 }
 145                 esp = esp_allocate(tpnt, (void *)board+FASTLANE_ESP_ADDR);
 146
 147                 /* Do command transfer with programmed I/O */
 148                 esp->do_pio_cmds = 1;
 149
 150                 /* Required functions */
 151                 esp->dma_bytes_sent = &dma_bytes_sent;
 152                 esp->dma_can_transfer = &dma_can_transfer;
 153                 esp->dma_dump_state = &dma_dump_state;
 154                 esp->dma_init_read = &dma_init_read;
 155                 esp->dma_init_write = &dma_init_write;
 156                 esp->dma_ints_off = &dma_ints_off;
 157                 esp->dma_ints_on = &dma_ints_on;
 158                 esp->dma_irq_p = &dma_irq_p;
 159                 esp->dma_ports_p = &dma_ports_p;
 160                 esp->dma_setup = &dma_setup;
 161
 162                 /* Optional functions */
 163                 esp->dma_barrier = 0;
 164                 esp->dma_drain = 0;
 165                 esp->dma_invalidate = 0;
 166                 esp->dma_irq_entry = 0;
 167                 esp->dma_irq_exit = &dma_irq_exit;
 168                 esp->dma_led_on = &dma_led_on;
 169                 esp->dma_led_off = &dma_led_off;
 170                 esp->dma_poll = 0;
 171                 esp->dma_reset = 0;
 172
 173                 /* Initialize the portBits (enable IRQs) */
 174                 ctrl_data = (FASTLANE_DMA_FCODE |
 175 #ifndef NODMAIRQ
 176                              FASTLANE_DMA_EDI |
 177 #endif
 178                              FASTLANE_DMA_ESI);
 179
 180
 181                 /* SCSI chip clock */
 182                 esp->cfreq = 40000000;
 183
 184
 185                 /* Map the physical address space into virtual kernel space */
 186                 address = (unsigned long)
 187                         z_ioremap(board, z->resource.end-board+1);
 188
 189                 if(!address){
 190                         printk("Could not remap Fastlane controller memory!");
 191                         goto err_unregister;
 192                 }
 193
 194
 195                 /* The DMA registers on the Fastlane are mapped
 196                  * relative to the device (i.e. in the same Zorro
 197                  * I/O block).
 198                  */
 199                 esp->dregs = (void *)(address + FASTLANE_DMA_ADDR);
 200
 201                 /* ESP register base */
 202                 esp->eregs = (struct ESP_regs *)(address + FASTLANE_ESP_ADDR);
 203
 204                 /* Board base */
 205                 esp->edev = (void *) address;
 206
 207                 /* Set the command buffer */
 208                 esp->esp_command = cmd_buffer;
 209                 esp->esp_command_dvma = virt_to_bus((void *)cmd_buffer);
 210
 211                 esp->irq = IRQ_AMIGA_PORTS;
 212                 esp->slot = board+FASTLANE_ESP_ADDR;
 213                 if (request_irq(IRQ_AMIGA_PORTS, esp_intr, IRQF_SHARED,
 214                                 "Fastlane SCSI", esp->ehost)) {
 215                         printk(KERN_WARNING "Fastlane: Could not get IRQ%d, aborting.\n", IRQ_AMIGA_PORTS);
 216                         goto err_unmap;
 217                 }
 218
 219                 /* Controller ID */
 220                 esp->scsi_id = 7;
 221
 222                 /* We don't have a differential SCSI-bus. */
 223                 esp->diff = 0;
 224
 225                 dma_clear(esp);
 226                 esp_initialize(esp);
 227
 228                 printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps, esps_in_use);
 229                 esps_running = esps_in_use;
 230                 return esps_in_use;
 231             }
 232         }
 233         return 0;
 234
 235  err_unmap:
 236         z_iounmap((void *)address);
 237  err_unregister:
 238         scsi_unregister (esp->ehost);
 239  err_release:
 240         release_mem_region(z->resource.start+FASTLANE_ESP_ADDR,
 241                            sizeof(struct ESP_regs));
 242         return 0;
 243 }
 244
 245
 246 /************************************************************* DMA Functions */
 247 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
 248 {
 249         /* Since the Fastlane DMA is fully dedicated to the ESP chip,
 250          * the number of bytes sent (to the ESP chip) equals the number
 251          * of bytes in the FIFO - there is no buffering in the DMA controller.
 252          * XXXX Do I read this right? It is from host to ESP, right?
 253          */
 254         return fifo_count;
 255 }
 256
 257 static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp)
 258 {
 259         unsigned long sz = sp->SCp.this_residual;
 260         if(sz > 0xfffc)
 261                 sz = 0xfffc;
 262         return sz;
 263 }
 264
 265 static void dma_dump_state(struct NCR_ESP *esp)
 266 {
 267         ESPLOG(("esp%d: dma -- cond_reg<%02x>\n",
 268                 esp->esp_id, ((struct fastlane_dma_registers *)
 269                               (esp->dregs))->cond_reg));
 270         ESPLOG(("intreq:<%04x>, intena:<%04x>\n",
 271                 amiga_custom.intreqr, amiga_custom.intenar));
 272 }
 273
 274 static void dma_init_read(struct NCR_ESP *esp, __u32 addr, int length)
 275 {
 276         struct fastlane_dma_registers *dregs =
 277                 (struct fastlane_dma_registers *) (esp->dregs);
 278         unsigned long *t;
 279
 280         cache_clear(addr, length);
 281
 282         dma_clear(esp);
 283
 284         t = (unsigned long *)((addr & 0x00ffffff) + esp->edev);
 285
 286         dregs->clear_strobe = 0;
 287         *t = addr;
 288
 289         ctrl_data = (ctrl_data & FASTLANE_DMA_MASK) | FASTLANE_DMA_ENABLE;
 290         dregs->ctrl_reg = ctrl_data;
 291 }
 292
 293 static void dma_init_write(struct NCR_ESP *esp, __u32 addr, int length)
 294 {
 295         struct fastlane_dma_registers *dregs =
 296                 (struct fastlane_dma_registers *) (esp->dregs);
 297         unsigned long *t;
 298
 299         cache_push(addr, length);
 300
 301         dma_clear(esp);
 302
 303         t = (unsigned long *)((addr & 0x00ffffff) + (esp->edev));
 304
 305         dregs->clear_strobe = 0;
 306         *t = addr;
 307
 308         ctrl_data = ((ctrl_data & FASTLANE_DMA_MASK) |
 309                      FASTLANE_DMA_ENABLE |
 310                      FASTLANE_DMA_WRITE);
 311         dregs->ctrl_reg = ctrl_data;
 312 }
 313
 314
 315 static void dma_ints_off(struct NCR_ESP *esp)
 316 {
 317         disable_irq(esp->irq);
 318 }
 319
 320 static void dma_ints_on(struct NCR_ESP *esp)
 321 {
 322         enable_irq(esp->irq);
 323 }
 324
 325 static void dma_irq_exit(struct NCR_ESP *esp)
 326 {
 327         struct fastlane_dma_registers *dregs =
 328                 (struct fastlane_dma_registers *) (esp->dregs);
 329
 330         dregs->ctrl_reg = ctrl_data & ~(FASTLANE_DMA_EDI|FASTLANE_DMA_ESI);
 331 #ifdef __mc68000__
 332         nop();
 333 #endif
 334         dregs->ctrl_reg = ctrl_data;
 335 }
 336
 337 static int dma_irq_p(struct NCR_ESP *esp)
 338 {
 339         struct fastlane_dma_registers *dregs =
 340                 (struct fastlane_dma_registers *) (esp->dregs);
 341         unsigned char dma_status;
 342
 343         dma_status = dregs->cond_reg;
 344
 345         if(dma_status & FASTLANE_DMA_IACT)
 346                 return 0;       /* not our IRQ */
 347
 348         /* Return non-zero if ESP requested IRQ */
 349         return (
 350 #ifndef NODMAIRQ
 351            (dma_status & FASTLANE_DMA_CREQ) &&
 352 #endif
 353            (!(dma_status & FASTLANE_DMA_MINT)) &&
 354            (esp_read(((struct ESP_regs *) (esp->eregs))->esp_status) & ESP_STAT_INTR));
 355 }
 356
 357 static void dma_led_off(struct NCR_ESP *esp)
 358 {
 359         ctrl_data &= ~FASTLANE_DMA_LED;
 360         ((struct fastlane_dma_registers *)(esp->dregs))->ctrl_reg = ctrl_data;
 361 }
 362
 363 static void dma_led_on(struct NCR_ESP *esp)
 364 {
 365         ctrl_data |= FASTLANE_DMA_LED;
 366         ((struct fastlane_dma_registers *)(esp->dregs))->ctrl_reg = ctrl_data;
 367 }
 368
 369 static int dma_ports_p(struct NCR_ESP *esp)
 370 {
 371         return ((amiga_custom.intenar) & IF_PORTS);
 372 }
 373
 374 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write)
 375 {
 376         /* On the Sparc, DMA_ST_WRITE means "move data from device to memory"
 377          * so when (write) is true, it actually means READ!
 378          */
 379         if(write){
 380                 dma_init_read(esp, addr, count);
 381         } else {
 382                 dma_init_write(esp, addr, count);
 383         }
 384 }
 385
 386 #define HOSTS_C
 387
 388 int fastlane_esp_release(struct Scsi_Host *instance)
 389 {
 390 #ifdef MODULE
 391         unsigned long address = (unsigned long)((struct NCR_ESP *)instance->hostdata)->edev;
 392         esp_deallocate((struct NCR_ESP *)instance->hostdata);
 393         esp_release();
 394         release_mem_region(address, sizeof(struct ESP_regs));
 395         free_irq(IRQ_AMIGA_PORTS, esp_intr);
 396 #endif
 397         return 1;
 398 }
 399
 400
 401 static struct scsi_host_template driver_template = {
 402         .proc_name              = "esp-fastlane",
 403         .proc_info              = esp_proc_info,
 404         .name                   = "Fastlane SCSI",
 405         .detect                 = fastlane_esp_detect,
 406         .slave_alloc            = esp_slave_alloc,
 407         .slave_destroy          = esp_slave_destroy,
 408         .release                = fastlane_esp_release,
 409         .queuecommand           = esp_queue,
 410         .eh_abort_handler       = esp_abort,
 411         .eh_bus_reset_handler   = esp_reset,
 412         .can_queue              = 7,
 413         .this_id                = 7,
 414         .sg_tablesize           = SG_ALL,
 415         .cmd_per_lun            = 1,
 416         .use_clustering         = ENABLE_CLUSTERING
 417 };
 418
 419 #include "scsi_module.c"
 420
 421 MODULE_LICENSE("GPL");