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