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 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 return 0; 287 } 288 289 #ifdef RESET_BOOT 290 /* 291 * Our 'bus reset on boot' function 292 */ 293 294 static void sun3_scsi_reset_boot(struct Scsi_Host *instance) 295 { 296 unsigned long end; 297 298 NCR5380_local_declare(); 299 NCR5380_setup(instance); 300 301 /* 302 * Do a SCSI reset to clean up the bus during initialization. No 303 * messing with the queues, interrupts, or locks necessary here. 304 */ 305 306 printk( "Sun3 SCSI: resetting the SCSI bus..." ); 307 308 /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */ 309 // sun3_disable_irq( IRQ_SUN3_SCSI ); 310 311 /* get in phase */ 312 NCR5380_write( TARGET_COMMAND_REG, 313 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) )); 314 315 /* assert RST */ 316 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST ); 317 318 /* The min. reset hold time is 25us, so 40us should be enough */ 319 udelay( 50 ); 320 321 /* reset RST and interrupt */ 322 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE ); 323 NCR5380_read( RESET_PARITY_INTERRUPT_REG ); 324 325 for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); ) 326 barrier(); 327 328 /* switch on SCSI IRQ again */ 329 // sun3_enable_irq( IRQ_SUN3_SCSI ); 330 331 printk( " done\n" ); 332 } 333 #endif 334 335 static const char * sun3scsi_info (struct Scsi_Host *spnt) { 336 return ""; 337 } 338 339 // safe bits for the CSR 340 #define CSR_GOOD 0x060f 341 342 static irqreturn_t scsi_sun3_intr(int irq, void *dummy) 343 { 344 unsigned short csr = dregs->csr; 345 int handled = 0; 346 347 dregs->csr &= ~CSR_DMA_ENABLE; 348 349 350 #ifdef SUN3_SCSI_DEBUG 351 printk("scsi_intr csr %x\n", csr); 352 #endif 353 354 if(csr & ~CSR_GOOD) { 355 if(csr & CSR_DMA_BUSERR) { 356 printk("scsi%d: bus error in dma\n", default_instance->host_no); 357 #ifdef SUN3_SCSI_DEBUG 358 printk("scsi: residual %x count %x addr %p dmaaddr %x\n", 359 dregs->fifo_count, 360 dregs->dma_count_lo | (dregs->dma_count_hi << 16), 361 sun3_dma_orig_addr, 362 dregs->dma_addr_lo | (dregs->dma_addr_hi << 16)); 363 #endif 364 } 365 366 if(csr & CSR_DMA_CONFLICT) { 367 printk("scsi%d: dma conflict\n", default_instance->host_no); 368 } 369 handled = 1; 370 } 371 372 if(csr & (CSR_SDB_INT | CSR_DMA_INT)) { 373 NCR5380_intr(irq, dummy); 374 handled = 1; 375 } 376 377 return IRQ_RETVAL(handled); 378 } 379 380 /* 381 * Debug stuff - to be called on NMI, or sysrq key. Use at your own risk; 382 * reentering NCR5380_print_status seems to have ugly side effects 383 */ 384 385 /* this doesn't seem to get used at all -- sam */ 386 #if 0 387 void sun3_sun3_debug (void) 388 { 389 unsigned long flags; 390 NCR5380_local_declare(); 391 392 if (default_instance) { 393 local_irq_save(flags); 394 NCR5380_print_status(default_instance); 395 local_irq_restore(flags); 396 } 397 } 398 #endif 399 400 401 /* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */ 402 static unsigned long sun3scsi_dma_setup(void *data, unsigned long count, int write_flag) 403 { 404 void *addr; 405 406 if(sun3_dma_orig_addr != NULL) 407 dvma_unmap(sun3_dma_orig_addr); 408 409 // addr = sun3_dvma_page((unsigned long)data, (unsigned long)dmabuf); 410 addr = (void *)dvma_map_vme((unsigned long) data, count); 411 412 sun3_dma_orig_addr = addr; 413 sun3_dma_orig_count = count; 414 415 #ifdef SUN3_SCSI_DEBUG 416 printk("scsi: dma_setup addr %p count %x\n", addr, count); 417 #endif 418 419 // dregs->fifo_count = 0; 420 #if 0 421 /* reset fifo */ 422 dregs->csr &= ~CSR_FIFO; 423 dregs->csr |= CSR_FIFO; 424 #endif 425 /* set direction */ 426 if(write_flag) 427 dregs->csr |= CSR_SEND; 428 else 429 dregs->csr &= ~CSR_SEND; 430 431 /* reset fifo */ 432 // dregs->csr &= ~CSR_FIFO; 433 // dregs->csr |= CSR_FIFO; 434 435 dregs->csr |= CSR_PACK_ENABLE; 436 437 dregs->dma_addr_hi = ((unsigned long)addr >> 16); 438 dregs->dma_addr_lo = ((unsigned long)addr & 0xffff); 439 440 dregs->dma_count_hi = 0; 441 dregs->dma_count_lo = 0; 442 dregs->fifo_count_hi = 0; 443 dregs->fifo_count = 0; 444 445 #ifdef SUN3_SCSI_DEBUG 446 printk("scsi: dma_setup done csr %x\n", dregs->csr); 447 #endif 448 return count; 449 450 } 451 452 static inline unsigned long sun3scsi_dma_residual(struct Scsi_Host *instance) 453 { 454 return last_residual; 455 } 456 457 static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted, 458 struct scsi_cmnd *cmd, 459 int write_flag) 460 { 461 if (cmd->request->cmd_type == REQ_TYPE_FS) 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 MODULE_LICENSE("GPL"); 586