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 47extern 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 69static irqreturn_t scsi_sun3_intr(int irq, void *dummy); 70static inline unsigned char sun3scsi_read(int reg); 71static inline void sun3scsi_write(int reg, int value); 72 73static int setup_can_queue = -1; 74module_param(setup_can_queue, int, 0); 75static int setup_cmd_per_lun = -1; 76module_param(setup_cmd_per_lun, int, 0); 77static int setup_sg_tablesize = -1; 78module_param(setup_sg_tablesize, int, 0); 79#ifdef SUPPORT_TAGS 80static int setup_use_tagged_queuing = -1; 81module_param(setup_use_tagged_queuing, int, 0); 82#endif 83static int setup_hostid = -1; 84module_param(setup_hostid, int, 0); 85 86static 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 99static volatile unsigned char *sun3_scsi_regp; 100static volatile struct sun3_dma_regs *dregs; 101#ifdef OLDDMA 102static unsigned char *dmabuf = NULL; /* dma memory buffer */ 103#endif 104static unsigned char *sun3_dma_orig_addr = NULL; 105static unsigned long sun3_dma_orig_count = 0; 106static int sun3_dma_active = 0; 107static unsigned long last_residual = 0; 108 109/* 110 * NCR 5380 register access functions 111 */ 112 113static inline unsigned char sun3scsi_read(int reg) 114{ 115 return( sun3_scsi_regp[reg] ); 116} 117 118static inline void sun3scsi_write(int reg, int value) 119{ 120 sun3_scsi_regp[reg] = value; 121} 122 123static 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 137static int 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", NULL)) { 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 276int sun3scsi_release (struct Scsi_Host *shpnt) 277{ 278 if (shpnt->irq != SCSI_IRQ_NONE) 279 free_irq (shpnt->irq, NULL); 280 281 iounmap((void *)sun3_scsi_regp); 282 283 return 0; 284} 285 286#ifdef RESET_BOOT 287/* 288 * Our 'bus reset on boot' function 289 */ 290 291static void sun3_scsi_reset_boot(struct Scsi_Host *instance) 292{ 293 unsigned long end; 294 295 NCR5380_local_declare(); 296 NCR5380_setup(instance); 297 298 /* 299 * Do a SCSI reset to clean up the bus during initialization. No 300 * messing with the queues, interrupts, or locks necessary here. 301 */ 302 303 printk( "Sun3 SCSI: resetting the SCSI bus..." ); 304 305 /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */ 306// sun3_disable_irq( IRQ_SUN3_SCSI ); 307 308 /* get in phase */ 309 NCR5380_write( TARGET_COMMAND_REG, 310 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) )); 311 312 /* assert RST */ 313 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST ); 314 315 /* The min. reset hold time is 25us, so 40us should be enough */ 316 udelay( 50 ); 317 318 /* reset RST and interrupt */ 319 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE ); 320 NCR5380_read( RESET_PARITY_INTERRUPT_REG ); 321 322 for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); ) 323 barrier(); 324 325 /* switch on SCSI IRQ again */ 326// sun3_enable_irq( IRQ_SUN3_SCSI ); 327 328 printk( " done\n" ); 329} 330#endif 331 332static const char * sun3scsi_info (struct Scsi_Host *spnt) { 333 return ""; 334} 335 336// safe bits for the CSR 337#define CSR_GOOD 0x060f 338 339static irqreturn_t scsi_sun3_intr(int irq, void *dummy) 340{ 341 unsigned short csr = dregs->csr; 342 int handled = 0; 343 344 dregs->csr &= ~CSR_DMA_ENABLE; 345 346 347#ifdef SUN3_SCSI_DEBUG 348 printk("scsi_intr csr %x\n", csr); 349#endif 350 351 if(csr & ~CSR_GOOD) { 352 if(csr & CSR_DMA_BUSERR) { 353 printk("scsi%d: bus error in dma\n", default_instance->host_no); 354#ifdef SUN3_SCSI_DEBUG 355 printk("scsi: residual %x count %x addr %p dmaaddr %x\n", 356 dregs->fifo_count, 357 dregs->dma_count_lo | (dregs->dma_count_hi << 16), 358 sun3_dma_orig_addr, 359 dregs->dma_addr_lo | (dregs->dma_addr_hi << 16)); 360#endif 361 } 362 363 if(csr & CSR_DMA_CONFLICT) { 364 printk("scsi%d: dma conflict\n", default_instance->host_no); 365 } 366 handled = 1; 367 } 368 369 if(csr & (CSR_SDB_INT | CSR_DMA_INT)) { 370 NCR5380_intr(irq, dummy); 371 handled = 1; 372 } 373 374 return IRQ_RETVAL(handled); 375} 376 377/* 378 * Debug stuff - to be called on NMI, or sysrq key. Use at your own risk; 379 * reentering NCR5380_print_status seems to have ugly side effects 380 */ 381 382/* this doesn't seem to get used at all -- sam */ 383 384 385/* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */ 386static unsigned long sun3scsi_dma_setup(void *data, unsigned long count, int write_flag) 387{ 388 void *addr; 389 390 if(sun3_dma_orig_addr != NULL) 391 dvma_unmap(sun3_dma_orig_addr); 392 393// addr = sun3_dvma_page((unsigned long)data, (unsigned long)dmabuf); 394 addr = (void *)dvma_map_vme((unsigned long) data, count); 395 396 sun3_dma_orig_addr = addr; 397 sun3_dma_orig_count = count; 398 399#ifdef SUN3_SCSI_DEBUG 400 printk("scsi: dma_setup addr %p count %x\n", addr, count); 401#endif 402 403// dregs->fifo_count = 0; 404 /* set direction */ 405 if(write_flag) 406 dregs->csr |= CSR_SEND; 407 else 408 dregs->csr &= ~CSR_SEND; 409 410 /* reset fifo */ 411// dregs->csr &= ~CSR_FIFO; 412// dregs->csr |= CSR_FIFO; 413 414 dregs->csr |= CSR_PACK_ENABLE; 415 416 dregs->dma_addr_hi = ((unsigned long)addr >> 16); 417 dregs->dma_addr_lo = ((unsigned long)addr & 0xffff); 418 419 dregs->dma_count_hi = 0; 420 dregs->dma_count_lo = 0; 421 dregs->fifo_count_hi = 0; 422 dregs->fifo_count = 0; 423 424#ifdef SUN3_SCSI_DEBUG 425 printk("scsi: dma_setup done csr %x\n", dregs->csr); 426#endif 427 return count; 428 429} 430 431static inline unsigned long sun3scsi_dma_residual(struct Scsi_Host *instance) 432{ 433 return last_residual; 434} 435 436static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted, 437 struct scsi_cmnd *cmd, 438 int write_flag) 439{ 440 if(blk_fs_request(cmd->request)) 441 return wanted; 442 else 443 return 0; 444} 445 446static int sun3scsi_dma_start(unsigned long count, char *data) 447{ 448 449 unsigned short csr; 450 451 csr = dregs->csr; 452#ifdef SUN3_SCSI_DEBUG 453 printk("scsi: dma_start data %p count %x csr %x fifo %x\n", data, count, csr, dregs->fifo_count); 454#endif 455 456 dregs->dma_count_hi = (sun3_dma_orig_count >> 16); 457 dregs->dma_count_lo = (sun3_dma_orig_count & 0xffff); 458 459 dregs->fifo_count_hi = (sun3_dma_orig_count >> 16); 460 dregs->fifo_count = (sun3_dma_orig_count & 0xffff); 461 462// if(!(csr & CSR_DMA_ENABLE)) 463// dregs->csr |= CSR_DMA_ENABLE; 464 465 return 0; 466} 467 468/* clean up after our dma is done */ 469static int sun3scsi_dma_finish(int write_flag) 470{ 471 unsigned short fifo; 472 int ret = 0; 473 474 sun3_dma_active = 0; 475 476 dregs->csr &= ~CSR_DMA_ENABLE; 477 478 fifo = dregs->fifo_count; 479 if(write_flag) { 480 if((fifo > 0) && (fifo < sun3_dma_orig_count)) 481 fifo++; 482 } 483 484 last_residual = fifo; 485#ifdef SUN3_SCSI_DEBUG 486 printk("scsi: residual %x total %x\n", fifo, sun3_dma_orig_count); 487#endif 488 /* empty bytes from the fifo which didn't make it */ 489 if((!write_flag) && (dregs->csr & CSR_LEFT)) { 490 unsigned char *vaddr; 491 492#ifdef SUN3_SCSI_DEBUG 493 printk("scsi: got left over bytes\n"); 494#endif 495 496 vaddr = (unsigned char *)dvma_vmetov(sun3_dma_orig_addr); 497 498 vaddr += (sun3_dma_orig_count - fifo); 499 vaddr--; 500 501 switch(dregs->csr & CSR_LEFT) { 502 case CSR_LEFT_3: 503 *vaddr = (dregs->bpack_lo & 0xff00) >> 8; 504 vaddr--; 505 506 case CSR_LEFT_2: 507 *vaddr = (dregs->bpack_hi & 0x00ff); 508 vaddr--; 509 510 case CSR_LEFT_1: 511 *vaddr = (dregs->bpack_hi & 0xff00) >> 8; 512 break; 513 } 514 515 516 } 517 518 dvma_unmap(sun3_dma_orig_addr); 519 sun3_dma_orig_addr = NULL; 520 521 dregs->dma_addr_hi = 0; 522 dregs->dma_addr_lo = 0; 523 dregs->dma_count_hi = 0; 524 dregs->dma_count_lo = 0; 525 526 dregs->fifo_count = 0; 527 dregs->fifo_count_hi = 0; 528 529 dregs->csr &= ~CSR_SEND; 530 531// dregs->csr |= CSR_DMA_ENABLE; 532 533 sun3_dma_setup_done = NULL; 534 535 return ret; 536 537} 538 539#include "sun3_NCR5380.c" 540 541static struct scsi_host_template driver_template = { 542 .name = SUN3_SCSI_NAME, 543 .detect = sun3scsi_detect, 544 .release = sun3scsi_release, 545 .info = sun3scsi_info, 546 .queuecommand = sun3scsi_queue_command, 547 .eh_abort_handler = sun3scsi_abort, 548 .eh_bus_reset_handler = sun3scsi_bus_reset, 549 .can_queue = CAN_QUEUE, 550 .this_id = 7, 551 .sg_tablesize = SG_TABLESIZE, 552 .cmd_per_lun = CMD_PER_LUN, 553 .use_clustering = DISABLE_CLUSTERING 554}; 555 556 557#include "scsi_module.c" 558