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