1 /* 2 * Sun3 SCSI stuff by Erik Verbruggen (erik@bigmama.xtdnet.nl) 3 * 4 * Sun3 DMA routines added by Sam Creasey (sammy@sammy.net) 5 * 6 * VME support added by Sam Creasey 7 * 8 * Adapted from sun3_scsi.c -- see there for other headers 9 * 10 * TODO: modify this driver to support multiple Sun3 SCSI VME boards 11 * 12 */ 13 14 #define AUTOSENSE 15 16 #include <linux/types.h> 17 #include <linux/stddef.h> 18 #include <linux/ctype.h> 19 #include <linux/delay.h> 20 21 #include <linux/module.h> 22 #include <linux/signal.h> 23 #include <linux/ioport.h> 24 #include <linux/init.h> 25 #include <linux/blkdev.h> 26 27 #include <asm/io.h> 28 #include <asm/system.h> 29 30 #include <asm/sun3ints.h> 31 #include <asm/dvma.h> 32 #include <asm/idprom.h> 33 #include <asm/machines.h> 34 35 #define SUN3_SCSI_VME 36 37 #undef SUN3_SCSI_DEBUG 38 39 /* dma on! */ 40 #define REAL_DMA 41 42 #define NDEBUG 0 43 44 #define NDEBUG_ABORT 0x00100000 45 #define NDEBUG_TAGS 0x00200000 46 #define NDEBUG_MERGING 0x00400000 47 48 #include "scsi.h" 49 #include "initio.h" 50 #include <scsi/scsi_host.h> 51 #include "sun3_scsi.h" 52 53 extern int sun3_map_test(unsigned long, char *); 54 55 #define USE_WRAPPER 56 /*#define RESET_BOOT */ 57 #define DRIVER_SETUP 58 59 /* 60 * BUG can be used to trigger a strange code-size related hang on 2.1 kernels 61 */ 62 #ifdef BUG 63 #undef RESET_BOOT 64 #undef DRIVER_SETUP 65 #endif 66 67 /* #define SUPPORT_TAGS */ 68 69 //#define ENABLE_IRQ() enable_irq( SUN3_VEC_VMESCSI0 ); 70 #define ENABLE_IRQ() 71 72 73 static irqreturn_t scsi_sun3_intr(int irq, void *dummy); 74 static inline unsigned char sun3scsi_read(int reg); 75 static inline void sun3scsi_write(int reg, int value); 76 77 static int setup_can_queue = -1; 78 module_param(setup_can_queue, int, 0); 79 static int setup_cmd_per_lun = -1; 80 module_param(setup_cmd_per_lun, int, 0); 81 static int setup_sg_tablesize = -1; 82 module_param(setup_sg_tablesize, int, 0); 83 #ifdef SUPPORT_TAGS 84 static int setup_use_tagged_queuing = -1; 85 module_param(setup_use_tagged_queuing, int, 0); 86 #endif 87 static int setup_hostid = -1; 88 module_param(setup_hostid, int, 0); 89 90 static struct scsi_cmnd *sun3_dma_setup_done = NULL; 91 92 #define AFTER_RESET_DELAY (HZ/2) 93 94 /* ms to wait after hitting dma regs */ 95 #define SUN3_DMA_DELAY 10 96 97 /* dvma buffer to allocate -- 32k should hopefully be more than sufficient */ 98 #define SUN3_DVMA_BUFSIZE 0xe000 99 100 /* minimum number of bytes to do dma on */ 101 #define SUN3_DMA_MINSIZE 128 102 103 static volatile unsigned char *sun3_scsi_regp; 104 static volatile struct sun3_dma_regs *dregs; 105 #ifdef OLDDMA 106 static unsigned char *dmabuf = NULL; /* dma memory buffer */ 107 #endif 108 static unsigned char *sun3_dma_orig_addr = NULL; 109 static unsigned long sun3_dma_orig_count = 0; 110 static int sun3_dma_active = 0; 111 static unsigned long last_residual = 0; 112 113 /* 114 * NCR 5380 register access functions 115 */ 116 117 static inline unsigned char sun3scsi_read(int reg) 118 { 119 return( sun3_scsi_regp[reg] ); 120 } 121 122 static inline void sun3scsi_write(int reg, int value) 123 { 124 sun3_scsi_regp[reg] = value; 125 } 126 127 /* 128 * XXX: status debug 129 */ 130 static struct Scsi_Host *default_instance; 131 132 /* 133 * Function : int sun3scsi_detect(struct scsi_host_template * tpnt) 134 * 135 * Purpose : initializes mac NCR5380 driver based on the 136 * command line / compile time port and irq definitions. 137 * 138 * Inputs : tpnt - template for this SCSI adapter. 139 * 140 * Returns : 1 if a host adapter was found, 0 if not. 141 * 142 */ 143 144 static int __init sun3scsi_detect(struct scsi_host_template * tpnt) 145 { 146 unsigned long ioaddr, irq = 0; 147 static int called = 0; 148 struct Scsi_Host *instance; 149 int i; 150 unsigned long addrs[3] = { IOBASE_SUN3_VMESCSI, 151 IOBASE_SUN3_VMESCSI + 0x4000, 152 0 }; 153 unsigned long vecs[3] = { SUN3_VEC_VMESCSI0, 154 SUN3_VEC_VMESCSI1, 155 0 }; 156 /* check that this machine has an onboard 5380 */ 157 switch(idprom->id_machtype) { 158 case SM_SUN3|SM_3_160: 159 case SM_SUN3|SM_3_260: 160 break; 161 162 default: 163 return 0; 164 } 165 166 if(called) 167 return 0; 168 169 tpnt->proc_name = "Sun3 5380 VME SCSI"; 170 171 /* setup variables */ 172 tpnt->can_queue = 173 (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE; 174 tpnt->cmd_per_lun = 175 (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN; 176 tpnt->sg_tablesize = 177 (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE; 178 179 if (setup_hostid >= 0) 180 tpnt->this_id = setup_hostid; 181 else { 182 /* use 7 as default */ 183 tpnt->this_id = 7; 184 } 185 186 ioaddr = 0; 187 for(i = 0; addrs[i] != 0; i++) { 188 unsigned char x; 189 190 ioaddr = (unsigned long)sun3_ioremap(addrs[i], PAGE_SIZE, 191 SUN3_PAGE_TYPE_VME16); 192 irq = vecs[i]; 193 sun3_scsi_regp = (unsigned char *)ioaddr; 194 195 dregs = (struct sun3_dma_regs *)(((unsigned char *)ioaddr) + 8); 196 197 if(sun3_map_test((unsigned long)dregs, &x)) { 198 unsigned short oldcsr; 199 200 oldcsr = dregs->csr; 201 dregs->csr = 0; 202 udelay(SUN3_DMA_DELAY); 203 if(dregs->csr == 0x1400) 204 break; 205 206 dregs->csr = oldcsr; 207 } 208 209 iounmap((void *)ioaddr); 210 ioaddr = 0; 211 } 212 213 if(!ioaddr) 214 return 0; 215 216 #ifdef SUPPORT_TAGS 217 if (setup_use_tagged_queuing < 0) 218 setup_use_tagged_queuing = USE_TAGGED_QUEUING; 219 #endif 220 221 instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata)); 222 if(instance == NULL) 223 return 0; 224 225 default_instance = instance; 226 227 instance->io_port = (unsigned long) ioaddr; 228 instance->irq = irq; 229 230 NCR5380_init(instance, 0); 231 232 instance->n_io_port = 32; 233 234 ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0; 235 236 if (request_irq(instance->irq, scsi_sun3_intr, 237 0, "Sun3SCSI-5380VME", instance)) { 238 #ifndef REAL_DMA 239 printk("scsi%d: IRQ%d not free, interrupts disabled\n", 240 instance->host_no, instance->irq); 241 instance->irq = SCSI_IRQ_NONE; 242 #else 243 printk("scsi%d: IRQ%d not free, bailing out\n", 244 instance->host_no, instance->irq); 245 return 0; 246 #endif 247 } 248 249 printk("scsi%d: Sun3 5380 VME at port %lX irq", instance->host_no, instance->io_port); 250 if (instance->irq == SCSI_IRQ_NONE) 251 printk ("s disabled"); 252 else 253 printk (" %d", instance->irq); 254 printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d", 255 instance->can_queue, instance->cmd_per_lun, 256 SUN3SCSI_PUBLIC_RELEASE); 257 printk("\nscsi%d:", instance->host_no); 258 NCR5380_print_options(instance); 259 printk("\n"); 260 261 dregs->csr = 0; 262 udelay(SUN3_DMA_DELAY); 263 dregs->csr = CSR_SCSI | CSR_FIFO | CSR_INTR; 264 udelay(SUN3_DMA_DELAY); 265 dregs->fifo_count = 0; 266 dregs->fifo_count_hi = 0; 267 dregs->dma_addr_hi = 0; 268 dregs->dma_addr_lo = 0; 269 dregs->dma_count_hi = 0; 270 dregs->dma_count_lo = 0; 271 272 dregs->ivect = VME_DATA24 | (instance->irq & 0xff); 273 274 called = 1; 275 276 #ifdef RESET_BOOT 277 sun3_scsi_reset_boot(instance); 278 #endif 279 280 return 1; 281 } 282 283 int sun3scsi_release (struct Scsi_Host *shpnt) 284 { 285 if (shpnt->irq != SCSI_IRQ_NONE) 286 free_irq(shpnt->irq, shpnt); 287 288 iounmap((void *)sun3_scsi_regp); 289 290 NCR5380_exit(shpnt); 291 return 0; 292 } 293 294 #ifdef RESET_BOOT 295 /* 296 * Our 'bus reset on boot' function 297 */ 298 299 static void sun3_scsi_reset_boot(struct Scsi_Host *instance) 300 { 301 unsigned long end; 302 303 NCR5380_local_declare(); 304 NCR5380_setup(instance); 305 306 /* 307 * Do a SCSI reset to clean up the bus during initialization. No 308 * messing with the queues, interrupts, or locks necessary here. 309 */ 310 311 printk( "Sun3 SCSI: resetting the SCSI bus..." ); 312 313 /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */ 314 // sun3_disable_irq( IRQ_SUN3_SCSI ); 315 316 /* get in phase */ 317 NCR5380_write( TARGET_COMMAND_REG, 318 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) )); 319 320 /* assert RST */ 321 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST ); 322 323 /* The min. reset hold time is 25us, so 40us should be enough */ 324 udelay( 50 ); 325 326 /* reset RST and interrupt */ 327 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE ); 328 NCR5380_read( RESET_PARITY_INTERRUPT_REG ); 329 330 for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); ) 331 barrier(); 332 333 /* switch on SCSI IRQ again */ 334 // sun3_enable_irq( IRQ_SUN3_SCSI ); 335 336 printk( " done\n" ); 337 } 338 #endif 339 340 static const char * sun3scsi_info (struct Scsi_Host *spnt) { 341 return ""; 342 } 343 344 // safe bits for the CSR 345 #define CSR_GOOD 0x060f 346 347 static irqreturn_t scsi_sun3_intr(int irq, void *dummy) 348 { 349 unsigned short csr = dregs->csr; 350 int handled = 0; 351 352 dregs->csr &= ~CSR_DMA_ENABLE; 353 354 355 #ifdef SUN3_SCSI_DEBUG 356 printk("scsi_intr csr %x\n", csr); 357 #endif 358 359 if(csr & ~CSR_GOOD) { 360 if(csr & CSR_DMA_BUSERR) { 361 printk("scsi%d: bus error in dma\n", default_instance->host_no); 362 #ifdef SUN3_SCSI_DEBUG 363 printk("scsi: residual %x count %x addr %p dmaaddr %x\n", 364 dregs->fifo_count, 365 dregs->dma_count_lo | (dregs->dma_count_hi << 16), 366 sun3_dma_orig_addr, 367 dregs->dma_addr_lo | (dregs->dma_addr_hi << 16)); 368 #endif 369 } 370 371 if(csr & CSR_DMA_CONFLICT) { 372 printk("scsi%d: dma conflict\n", default_instance->host_no); 373 } 374 handled = 1; 375 } 376 377 if(csr & (CSR_SDB_INT | CSR_DMA_INT)) { 378 NCR5380_intr(irq, dummy); 379 handled = 1; 380 } 381 382 return IRQ_RETVAL(handled); 383 } 384 385 /* 386 * Debug stuff - to be called on NMI, or sysrq key. Use at your own risk; 387 * reentering NCR5380_print_status seems to have ugly side effects 388 */ 389 390 /* this doesn't seem to get used at all -- sam */ 391 #if 0 392 void sun3_sun3_debug (void) 393 { 394 unsigned long flags; 395 NCR5380_local_declare(); 396 397 if (default_instance) { 398 local_irq_save(flags); 399 NCR5380_print_status(default_instance); 400 local_irq_restore(flags); 401 } 402 } 403 #endif 404 405 406 /* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */ 407 static unsigned long sun3scsi_dma_setup(void *data, unsigned long count, int write_flag) 408 { 409 void *addr; 410 411 if(sun3_dma_orig_addr != NULL) 412 dvma_unmap(sun3_dma_orig_addr); 413 414 // addr = sun3_dvma_page((unsigned long)data, (unsigned long)dmabuf); 415 addr = (void *)dvma_map_vme((unsigned long) data, count); 416 417 sun3_dma_orig_addr = addr; 418 sun3_dma_orig_count = count; 419 420 #ifdef SUN3_SCSI_DEBUG 421 printk("scsi: dma_setup addr %p count %x\n", addr, count); 422 #endif 423 424 // dregs->fifo_count = 0; 425 #if 0 426 /* reset fifo */ 427 dregs->csr &= ~CSR_FIFO; 428 dregs->csr |= CSR_FIFO; 429 #endif 430 /* set direction */ 431 if(write_flag) 432 dregs->csr |= CSR_SEND; 433 else 434 dregs->csr &= ~CSR_SEND; 435 436 /* reset fifo */ 437 // dregs->csr &= ~CSR_FIFO; 438 // dregs->csr |= CSR_FIFO; 439 440 dregs->csr |= CSR_PACK_ENABLE; 441 442 dregs->dma_addr_hi = ((unsigned long)addr >> 16); 443 dregs->dma_addr_lo = ((unsigned long)addr & 0xffff); 444 445 dregs->dma_count_hi = 0; 446 dregs->dma_count_lo = 0; 447 dregs->fifo_count_hi = 0; 448 dregs->fifo_count = 0; 449 450 #ifdef SUN3_SCSI_DEBUG 451 printk("scsi: dma_setup done csr %x\n", dregs->csr); 452 #endif 453 return count; 454 455 } 456 457 static inline unsigned long sun3scsi_dma_residual(struct Scsi_Host *instance) 458 { 459 return last_residual; 460 } 461 462 static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted, 463 struct scsi_cmnd *cmd, 464 int write_flag) 465 { 466 if (cmd->request->cmd_type == REQ_TYPE_FS) 467 return wanted; 468 else 469 return 0; 470 } 471 472 static int sun3scsi_dma_start(unsigned long count, char *data) 473 { 474 475 unsigned short csr; 476 477 csr = dregs->csr; 478 #ifdef SUN3_SCSI_DEBUG 479 printk("scsi: dma_start data %p count %x csr %x fifo %x\n", data, count, csr, dregs->fifo_count); 480 #endif 481 482 dregs->dma_count_hi = (sun3_dma_orig_count >> 16); 483 dregs->dma_count_lo = (sun3_dma_orig_count & 0xffff); 484 485 dregs->fifo_count_hi = (sun3_dma_orig_count >> 16); 486 dregs->fifo_count = (sun3_dma_orig_count & 0xffff); 487 488 // if(!(csr & CSR_DMA_ENABLE)) 489 // dregs->csr |= CSR_DMA_ENABLE; 490 491 return 0; 492 } 493 494 /* clean up after our dma is done */ 495 static int sun3scsi_dma_finish(int write_flag) 496 { 497 unsigned short fifo; 498 int ret = 0; 499 500 sun3_dma_active = 0; 501 502 dregs->csr &= ~CSR_DMA_ENABLE; 503 504 fifo = dregs->fifo_count; 505 if(write_flag) { 506 if((fifo > 0) && (fifo < sun3_dma_orig_count)) 507 fifo++; 508 } 509 510 last_residual = fifo; 511 #ifdef SUN3_SCSI_DEBUG 512 printk("scsi: residual %x total %x\n", fifo, sun3_dma_orig_count); 513 #endif 514 /* empty bytes from the fifo which didn't make it */ 515 if((!write_flag) && (dregs->csr & CSR_LEFT)) { 516 unsigned char *vaddr; 517 518 #ifdef SUN3_SCSI_DEBUG 519 printk("scsi: got left over bytes\n"); 520 #endif 521 522 vaddr = (unsigned char *)dvma_vmetov(sun3_dma_orig_addr); 523 524 vaddr += (sun3_dma_orig_count - fifo); 525 vaddr--; 526 527 switch(dregs->csr & CSR_LEFT) { 528 case CSR_LEFT_3: 529 *vaddr = (dregs->bpack_lo & 0xff00) >> 8; 530 vaddr--; 531 532 case CSR_LEFT_2: 533 *vaddr = (dregs->bpack_hi & 0x00ff); 534 vaddr--; 535 536 case CSR_LEFT_1: 537 *vaddr = (dregs->bpack_hi & 0xff00) >> 8; 538 break; 539 } 540 541 542 } 543 544 dvma_unmap(sun3_dma_orig_addr); 545 sun3_dma_orig_addr = NULL; 546 547 dregs->dma_addr_hi = 0; 548 dregs->dma_addr_lo = 0; 549 dregs->dma_count_hi = 0; 550 dregs->dma_count_lo = 0; 551 552 dregs->fifo_count = 0; 553 dregs->fifo_count_hi = 0; 554 555 dregs->csr &= ~CSR_SEND; 556 557 // dregs->csr |= CSR_DMA_ENABLE; 558 559 #if 0 560 /* reset fifo */ 561 dregs->csr &= ~CSR_FIFO; 562 dregs->csr |= CSR_FIFO; 563 #endif 564 sun3_dma_setup_done = NULL; 565 566 return ret; 567 568 } 569 570 #include "sun3_NCR5380.c" 571 572 static struct scsi_host_template driver_template = { 573 .name = SUN3_SCSI_NAME, 574 .detect = sun3scsi_detect, 575 .release = sun3scsi_release, 576 .info = sun3scsi_info, 577 .queuecommand = sun3scsi_queue_command, 578 .eh_abort_handler = sun3scsi_abort, 579 .eh_bus_reset_handler = sun3scsi_bus_reset, 580 .can_queue = CAN_QUEUE, 581 .this_id = 7, 582 .sg_tablesize = SG_TABLESIZE, 583 .cmd_per_lun = CMD_PER_LUN, 584 .use_clustering = DISABLE_CLUSTERING 585 }; 586 587 588 #include "scsi_module.c" 589 590 MODULE_LICENSE("GPL"); 591