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