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/sched.h> 24 #include <linux/ioport.h> 25 #include <linux/init.h> 26 #include <linux/blkdev.h> 27 28 #include <asm/io.h> 29 #include <asm/system.h> 30 31 #include <asm/sun3ints.h> 32 #include <asm/dvma.h> 33 #include <asm/idprom.h> 34 #include <asm/machines.h> 35 36 #define SUN3_SCSI_VME 37 38 #undef SUN3_SCSI_DEBUG 39 40 /* dma on! */ 41 #define REAL_DMA 42 43 #include "scsi.h" 44 #include <scsi/scsi_host.h> 45 #include "sun3_scsi.h" 46 #include "NCR5380.h" 47 48 extern int sun3_map_test(unsigned long, char *); 49 50 #define USE_WRAPPER 51 /*#define RESET_BOOT */ 52 #define DRIVER_SETUP 53 54 #define NDEBUG 0 55 56 /* 57 * BUG can be used to trigger a strange code-size related hang on 2.1 kernels 58 */ 59 #ifdef BUG 60 #undef RESET_BOOT 61 #undef DRIVER_SETUP 62 #endif 63 64 /* #define SUPPORT_TAGS */ 65 66 //#define ENABLE_IRQ() enable_irq( SUN3_VEC_VMESCSI0 ); 67 #define ENABLE_IRQ() 68 69 70 static irqreturn_t scsi_sun3_intr(int irq, void *dummy, struct pt_regs *fp); 71 static inline unsigned char sun3scsi_read(int reg); 72 static inline void sun3scsi_write(int reg, int value); 73 74 static int setup_can_queue = -1; 75 module_param(setup_can_queue, int, 0); 76 static int setup_cmd_per_lun = -1; 77 module_param(setup_cmd_per_lun, int, 0); 78 static int setup_sg_tablesize = -1; 79 module_param(setup_sg_tablesize, int, 0); 80 #ifdef SUPPORT_TAGS 81 static int setup_use_tagged_queuing = -1; 82 module_param(setup_use_tagged_queuing, int, 0); 83 #endif 84 static int setup_hostid = -1; 85 module_param(setup_hostid, int, 0); 86 87 static Scsi_Cmnd *sun3_dma_setup_done = NULL; 88 89 #define AFTER_RESET_DELAY (HZ/2) 90 91 /* ms to wait after hitting dma regs */ 92 #define SUN3_DMA_DELAY 10 93 94 /* dvma buffer to allocate -- 32k should hopefully be more than sufficient */ 95 #define SUN3_DVMA_BUFSIZE 0xe000 96 97 /* minimum number of bytes to do dma on */ 98 #define SUN3_DMA_MINSIZE 128 99 100 static volatile unsigned char *sun3_scsi_regp; 101 static volatile struct sun3_dma_regs *dregs; 102 #ifdef OLDDMA 103 static unsigned char *dmabuf = NULL; /* dma memory buffer */ 104 #endif 105 static unsigned char *sun3_dma_orig_addr = NULL; 106 static unsigned long sun3_dma_orig_count = 0; 107 static int sun3_dma_active = 0; 108 static unsigned long last_residual = 0; 109 110 /* 111 * NCR 5380 register access functions 112 */ 113 114 static inline unsigned char sun3scsi_read(int reg) 115 { 116 return( sun3_scsi_regp[reg] ); 117 } 118 119 static inline void sun3scsi_write(int reg, int value) 120 { 121 sun3_scsi_regp[reg] = value; 122 } 123 124 /* 125 * XXX: status debug 126 */ 127 static struct Scsi_Host *default_instance; 128 129 /* 130 * Function : int sun3scsi_detect(struct scsi_host_template * tpnt) 131 * 132 * Purpose : initializes mac NCR5380 driver based on the 133 * command line / compile time port and irq definitions. 134 * 135 * Inputs : tpnt - template for this SCSI adapter. 136 * 137 * Returns : 1 if a host adapter was found, 0 if not. 138 * 139 */ 140 141 static int sun3scsi_detect(struct scsi_host_template * tpnt) 142 { 143 unsigned long ioaddr, irq = 0; 144 static int called = 0; 145 struct Scsi_Host *instance; 146 int i; 147 unsigned long addrs[3] = { IOBASE_SUN3_VMESCSI, 148 IOBASE_SUN3_VMESCSI + 0x4000, 149 0 }; 150 unsigned long vecs[3] = { SUN3_VEC_VMESCSI0, 151 SUN3_VEC_VMESCSI1, 152 0 }; 153 /* check that this machine has an onboard 5380 */ 154 switch(idprom->id_machtype) { 155 case SM_SUN3|SM_3_160: 156 case SM_SUN3|SM_3_260: 157 break; 158 159 default: 160 return 0; 161 } 162 163 if(called) 164 return 0; 165 166 tpnt->proc_name = "Sun3 5380 VME SCSI"; 167 168 /* setup variables */ 169 tpnt->can_queue = 170 (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE; 171 tpnt->cmd_per_lun = 172 (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN; 173 tpnt->sg_tablesize = 174 (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE; 175 176 if (setup_hostid >= 0) 177 tpnt->this_id = setup_hostid; 178 else { 179 /* use 7 as default */ 180 tpnt->this_id = 7; 181 } 182 183 ioaddr = 0; 184 for(i = 0; addrs[i] != 0; i++) { 185 unsigned char x; 186 187 ioaddr = (unsigned long)sun3_ioremap(addrs[i], PAGE_SIZE, 188 SUN3_PAGE_TYPE_VME16); 189 irq = vecs[i]; 190 sun3_scsi_regp = (unsigned char *)ioaddr; 191 192 dregs = (struct sun3_dma_regs *)(((unsigned char *)ioaddr) + 8); 193 194 if(sun3_map_test((unsigned long)dregs, &x)) { 195 unsigned short oldcsr; 196 197 oldcsr = dregs->csr; 198 dregs->csr = 0; 199 udelay(SUN3_DMA_DELAY); 200 if(dregs->csr == 0x1400) 201 break; 202 203 dregs->csr = oldcsr; 204 } 205 206 iounmap((void *)ioaddr); 207 ioaddr = 0; 208 } 209 210 if(!ioaddr) 211 return 0; 212 213 #ifdef SUPPORT_TAGS 214 if (setup_use_tagged_queuing < 0) 215 setup_use_tagged_queuing = USE_TAGGED_QUEUING; 216 #endif 217 218 instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata)); 219 if(instance == NULL) 220 return 0; 221 222 default_instance = instance; 223 224 instance->io_port = (unsigned long) ioaddr; 225 instance->irq = irq; 226 227 NCR5380_init(instance, 0); 228 229 instance->n_io_port = 32; 230 231 ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0; 232 233 if (request_irq(instance->irq, scsi_sun3_intr, 234 0, "Sun3SCSI-5380VME", NULL)) { 235 #ifndef REAL_DMA 236 printk("scsi%d: IRQ%d not free, interrupts disabled\n", 237 instance->host_no, instance->irq); 238 instance->irq = SCSI_IRQ_NONE; 239 #else 240 printk("scsi%d: IRQ%d not free, bailing out\n", 241 instance->host_no, instance->irq); 242 return 0; 243 #endif 244 } 245 246 printk("scsi%d: Sun3 5380 VME at port %lX irq", instance->host_no, instance->io_port); 247 if (instance->irq == SCSI_IRQ_NONE) 248 printk ("s disabled"); 249 else 250 printk (" %d", instance->irq); 251 printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d", 252 instance->can_queue, instance->cmd_per_lun, 253 SUN3SCSI_PUBLIC_RELEASE); 254 printk("\nscsi%d:", instance->host_no); 255 NCR5380_print_options(instance); 256 printk("\n"); 257 258 dregs->csr = 0; 259 udelay(SUN3_DMA_DELAY); 260 dregs->csr = CSR_SCSI | CSR_FIFO | CSR_INTR; 261 udelay(SUN3_DMA_DELAY); 262 dregs->fifo_count = 0; 263 dregs->fifo_count_hi = 0; 264 dregs->dma_addr_hi = 0; 265 dregs->dma_addr_lo = 0; 266 dregs->dma_count_hi = 0; 267 dregs->dma_count_lo = 0; 268 269 dregs->ivect = VME_DATA24 | (instance->irq & 0xff); 270 271 called = 1; 272 273 #ifdef RESET_BOOT 274 sun3_scsi_reset_boot(instance); 275 #endif 276 277 return 1; 278 } 279 280 int sun3scsi_release (struct Scsi_Host *shpnt) 281 { 282 if (shpnt->irq != SCSI_IRQ_NONE) 283 free_irq (shpnt->irq, NULL); 284 285 iounmap((void *)sun3_scsi_regp); 286 287 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, struct pt_regs *fp) 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, fp); 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, Scsi_Cmnd *cmd, 459 int write_flag) 460 { 461 if(blk_fs_request(cmd->request)) 462 return wanted; 463 else 464 return 0; 465 } 466 467 static int sun3scsi_dma_start(unsigned long count, char *data) 468 { 469 470 unsigned short csr; 471 472 csr = dregs->csr; 473 #ifdef SUN3_SCSI_DEBUG 474 printk("scsi: dma_start data %p count %x csr %x fifo %x\n", data, count, csr, dregs->fifo_count); 475 #endif 476 477 dregs->dma_count_hi = (sun3_dma_orig_count >> 16); 478 dregs->dma_count_lo = (sun3_dma_orig_count & 0xffff); 479 480 dregs->fifo_count_hi = (sun3_dma_orig_count >> 16); 481 dregs->fifo_count = (sun3_dma_orig_count & 0xffff); 482 483 // if(!(csr & CSR_DMA_ENABLE)) 484 // dregs->csr |= CSR_DMA_ENABLE; 485 486 return 0; 487 } 488 489 /* clean up after our dma is done */ 490 static int sun3scsi_dma_finish(int write_flag) 491 { 492 unsigned short fifo; 493 int ret = 0; 494 495 sun3_dma_active = 0; 496 497 dregs->csr &= ~CSR_DMA_ENABLE; 498 499 fifo = dregs->fifo_count; 500 if(write_flag) { 501 if((fifo > 0) && (fifo < sun3_dma_orig_count)) 502 fifo++; 503 } 504 505 last_residual = fifo; 506 #ifdef SUN3_SCSI_DEBUG 507 printk("scsi: residual %x total %x\n", fifo, sun3_dma_orig_count); 508 #endif 509 /* empty bytes from the fifo which didn't make it */ 510 if((!write_flag) && (dregs->csr & CSR_LEFT)) { 511 unsigned char *vaddr; 512 513 #ifdef SUN3_SCSI_DEBUG 514 printk("scsi: got left over bytes\n"); 515 #endif 516 517 vaddr = (unsigned char *)dvma_vmetov(sun3_dma_orig_addr); 518 519 vaddr += (sun3_dma_orig_count - fifo); 520 vaddr--; 521 522 switch(dregs->csr & CSR_LEFT) { 523 case CSR_LEFT_3: 524 *vaddr = (dregs->bpack_lo & 0xff00) >> 8; 525 vaddr--; 526 527 case CSR_LEFT_2: 528 *vaddr = (dregs->bpack_hi & 0x00ff); 529 vaddr--; 530 531 case CSR_LEFT_1: 532 *vaddr = (dregs->bpack_hi & 0xff00) >> 8; 533 break; 534 } 535 536 537 } 538 539 dvma_unmap(sun3_dma_orig_addr); 540 sun3_dma_orig_addr = NULL; 541 542 dregs->dma_addr_hi = 0; 543 dregs->dma_addr_lo = 0; 544 dregs->dma_count_hi = 0; 545 dregs->dma_count_lo = 0; 546 547 dregs->fifo_count = 0; 548 dregs->fifo_count_hi = 0; 549 550 dregs->csr &= ~CSR_SEND; 551 552 // dregs->csr |= CSR_DMA_ENABLE; 553 554 #if 0 555 /* reset fifo */ 556 dregs->csr &= ~CSR_FIFO; 557 dregs->csr |= CSR_FIFO; 558 #endif 559 sun3_dma_setup_done = NULL; 560 561 return ret; 562 563 } 564 565 #include "sun3_NCR5380.c" 566 567 static struct scsi_host_template driver_template = { 568 .name = SUN3_SCSI_NAME, 569 .detect = sun3scsi_detect, 570 .release = sun3scsi_release, 571 .info = sun3scsi_info, 572 .queuecommand = sun3scsi_queue_command, 573 .eh_abort_handler = sun3scsi_abort, 574 .eh_bus_reset_handler = sun3scsi_bus_reset, 575 .can_queue = CAN_QUEUE, 576 .this_id = 7, 577 .sg_tablesize = SG_TABLESIZE, 578 .cmd_per_lun = CMD_PER_LUN, 579 .use_clustering = DISABLE_CLUSTERING 580 }; 581 582 583 #include "scsi_module.c" 584 585