atari5380.c revision 1.34
1 /* $NetBSD: atari5380.c,v 1.34 2003/04/01 23:47:02 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Leo Weppelman. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Leo Weppelman. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include "opt_atariscsi.h" 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/device.h> 39 #include <sys/buf.h> 40 #include <dev/scsipi/scsi_all.h> 41 #include <dev/scsipi/scsipi_all.h> 42 #include <dev/scsipi/scsi_message.h> 43 #include <dev/scsipi/scsiconf.h> 44 45 #include <uvm/uvm_extern.h> 46 47 #include <m68k/asm_single.h> 48 #include <m68k/cpu.h> 49 #include <m68k/cacheops.h> 50 51 #include <atari/atari/stalloc.h> 52 53 /* 54 * Include the driver definitions 55 */ 56 #include <atari/dev/ncr5380reg.h> 57 58 #include <machine/stdarg.h> 59 #include <machine/iomap.h> 60 #include <machine/mfp.h> 61 62 #include <atari/atari/intr.h> 63 64 #if defined(FALCON_SCSI) 65 #include <machine/dma.h> 66 #endif 67 68 /* 69 * Set the various driver options 70 */ 71 #define NREQ 18 /* Size of issue queue */ 72 #define AUTO_SENSE 1 /* Automatically issue a request-sense */ 73 74 #define DRNAME ncrscsi /* used in various prints */ 75 #undef DBG_SEL /* Show the selection process */ 76 #undef DBG_REQ /* Show enqueued/ready requests */ 77 #undef DBG_ERR_RET /* Show requests with != 0 return code */ 78 #undef DBG_NOWRITE /* Do not allow writes to the targets */ 79 #undef DBG_PIO /* Show the polled-I/O process */ 80 #undef DBG_INF /* Show information transfer process */ 81 #define DBG_NOSTATIC /* No static functions, all in DDB trace*/ 82 #define DBG_PID 15 /* Keep track of driver */ 83 #define REAL_DMA /* Use DMA if sensible */ 84 #if defined(FALCON_SCSI) 85 #define REAL_DMA_POLL 1 /* 1: Poll for end of DMA-transfer */ 86 #else 87 #define REAL_DMA_POLL 0 /* 1: Poll for end of DMA-transfer */ 88 #endif 89 #undef USE_PDMA /* Use special pdma-transfer function */ 90 #define MIN_PHYS 65536 /*BARF!!!!*/ 91 92 /* 93 * Include more driver definitions 94 */ 95 #include <atari/dev/ncr5380var.h> 96 97 /* 98 * The atari specific driver options 99 */ 100 #undef NO_TTRAM_DMA /* Do not use DMA to TT-ram. This */ 101 /* fails on older atari's */ 102 #define ENABLE_NCR5380(sc) cur_softc = sc; 103 104 static u_char *alloc_bounceb __P((u_long)); 105 static void free_bounceb __P((u_char *)); 106 static int machine_match __P((struct device *, void *, void *, 107 struct cfdriver *)); 108 void scsi_ctrl __P((int)); 109 void scsi_dma __P((int)); 110 111 /* 112 * Functions that do nothing on the atari 113 */ 114 #define pdma_ready() 0 115 116 #if defined(TT_SCSI) 117 118 void ncr5380_drq_intr __P((int)); 119 120 /* 121 * Define all the things we need of the DMA-controller 122 */ 123 #define SCSI_DMA ((struct scsi_dma *)AD_SCSI_DMA) 124 #define SCSI_5380 ((struct scsi_5380 *)AD_NCR5380) 125 126 struct scsi_dma { 127 volatile u_char s_dma_ptr[8]; /* use only the odd bytes */ 128 volatile u_char s_dma_cnt[8]; /* use only the odd bytes */ 129 volatile u_char s_dma_res[4]; /* data residue register */ 130 volatile u_char s_dma_gap; /* not used */ 131 volatile u_char s_dma_ctrl; /* control register */ 132 volatile u_char s_dma_gap2; /* not used */ 133 volatile u_char s_hdma_ctrl; /* Hades control register */ 134 }; 135 136 #define set_scsi_dma(addr, val) (void)( \ 137 { \ 138 u_char *address = (u_char*)addr+1; \ 139 u_long nval = (u_long)val; \ 140 __asm("movepl %0, %1@(0)": :"d" (nval), "a" (address)); \ 141 }) 142 143 #define get_scsi_dma(addr, res) ( \ 144 { \ 145 u_char *address = (u_char*)addr+1; \ 146 u_long nval; \ 147 __asm("movepl %1@(0), %0": "=d" (nval) : "a" (address)); \ 148 res = (u_long)nval; \ 149 }) 150 151 /* 152 * Defines for TT-DMA control register 153 */ 154 #define SD_BUSERR 0x80 /* 1 = transfer caused bus error*/ 155 #define SD_ZERO 0x40 /* 1 = byte counter is zero */ 156 #define SD_ENABLE 0x02 /* 1 = Enable DMA */ 157 #define SD_OUT 0x01 /* Direction: memory to SCSI */ 158 #define SD_IN 0x00 /* Direction: SCSI to memory */ 159 160 /* 161 * Defines for Hades-DMA control register 162 */ 163 #define SDH_BUSERR 0x02 /* 1 = Bus error */ 164 #define SDH_EOP 0x01 /* 1 = Signal EOP on 5380 */ 165 #define SDH_ZERO 0x40 /* 1 = Byte counter is zero */ 166 167 /* 168 * Define the 5380 register set 169 */ 170 struct scsi_5380 { 171 volatile u_char scsi_5380[16]; /* use only the odd bytes */ 172 }; 173 #endif /* TT_SCSI */ 174 175 /********************************************** 176 * Variables present for both TT and Falcon. * 177 **********************************************/ 178 179 /* 180 * Softc of currently active controller (a bit of fake; we only have one) 181 */ 182 static struct ncr_softc *cur_softc; 183 184 #if defined(TT_SCSI) && !defined(FALCON_SCSI) 185 /* 186 * We can be more efficient for some functions when only TT_SCSI is selected 187 */ 188 #define GET_5380_REG(rnum) SCSI_5380->scsi_5380[(rnum << 1) | 1] 189 #define SET_5380_REG(rnum,val) (SCSI_5380->scsi_5380[(rnum << 1) | 1] = val) 190 191 #define scsi_mach_init(sc) scsi_tt_init(sc) 192 #define scsi_ienable() scsi_tt_ienable() 193 #define scsi_idisable() scsi_tt_idisable() 194 #define scsi_clr_ipend() scsi_tt_clr_ipend() 195 #define scsi_ipending() (GET_5380_REG(NCR5380_DMSTAT) & SC_IRQ_SET) 196 #define scsi_dma_setup(r,p,m) scsi_tt_dmasetup(r, p, m) 197 #define wrong_dma_range(r,d) tt_wrong_dma_range(r, d) 198 #define poll_edma(reqp) tt_poll_edma(reqp) 199 #define get_dma_result(r, b) tt_get_dma_result(r, b) 200 #define can_access_5380() 1 201 #define emulated_dma() ((machineid & ATARI_HADES) ? 1 : 0) 202 203 #define fair_to_keep_dma() 1 204 #define claimed_dma() 1 205 #define reconsider_dma() 206 207 #endif /* defined(TT_SCSI) && !defined(FALCON_SCSI) */ 208 209 #if defined(TT_SCSI) 210 211 /* 212 * Prototype functions defined below 213 */ 214 #ifdef NO_TTRAM_DMA 215 static int tt_wrong_dma_range __P((SC_REQ *, struct dma_chain *)); 216 #endif 217 static void scsi_tt_init __P((struct ncr_softc *)); 218 static u_char get_tt_5380_reg __P((u_short)); 219 static void set_tt_5380_reg __P((u_short, u_short)); 220 static void scsi_tt_dmasetup __P((SC_REQ *, u_int, u_char)); 221 static int tt_poll_edma __P((SC_REQ *)); 222 static u_char *ptov __P((SC_REQ *, u_long*)); 223 static int tt_get_dma_result __P((SC_REQ *, u_long *)); 224 void scsi_tt_ienable __P((void)); 225 void scsi_tt_idisable __P((void)); 226 void scsi_tt_clr_ipend __P((void)); 227 228 /* 229 * Define these too, so we can use them locally... 230 */ 231 #define GET_TT_REG(rnum) SCSI_5380->scsi_5380[(rnum << 1) | 1] 232 #define SET_TT_REG(rnum,val) (SCSI_5380->scsi_5380[(rnum << 1) | 1] = val) 233 234 #ifdef NO_TTRAM_DMA 235 static int 236 tt_wrong_dma_range(reqp, dm) 237 SC_REQ *reqp; 238 struct dma_chain *dm; 239 { 240 if (dm->dm_addr & 0xff000000) { 241 reqp->dr_flag |= DRIVER_BOUNCING; 242 return(1); 243 } 244 return(0); 245 } 246 #else 247 #define tt_wrong_dma_range(reqp, dm) 0 248 #endif 249 250 static void 251 scsi_tt_init(struct ncr_softc *sc) 252 { 253 /* 254 * Enable SCSI-related interrupts 255 */ 256 MFP2->mf_aer |= 0x80; /* SCSI IRQ goes HIGH!!!!! */ 257 258 if (machineid & ATARI_TT) { 259 /* SCSI-dma interrupts */ 260 MFP2->mf_ierb |= IB_SCDM; 261 MFP2->mf_iprb = (u_int8_t)~IB_SCDM; 262 MFP2->mf_imrb |= IB_SCDM; 263 } 264 else if (machineid & ATARI_HADES) { 265 SCSI_DMA->s_hdma_ctrl = 0; 266 267 if (intr_establish(2, AUTO_VEC, 0, 268 (hw_ifun_t)ncr5380_drq_intr, 269 NULL) == NULL) 270 panic("scsi_tt_init: Can't establish drq-interrupt"); 271 } 272 else panic("scsi_tt_init: should not come here"); 273 274 MFP2->mf_iera |= IA_SCSI; /* SCSI-5380 interrupts */ 275 MFP2->mf_ipra = (u_int8_t)~IA_SCSI; 276 MFP2->mf_imra |= IA_SCSI; 277 278 /* 279 * LWP: DMA transfers to TT-ram causes data to be garbeled 280 * without notice on some revisons of the TT-mainboard. 281 * When program's generate misterious Segmentations faults, 282 * try turning on NO_TTRAM_DMA. 283 */ 284 #ifdef NO_TTRAM_DMA 285 printf(": DMA to TT-RAM is disabled!"); 286 #endif 287 } 288 289 static u_char 290 get_tt_5380_reg(u_short rnum) 291 { 292 return(SCSI_5380->scsi_5380[(rnum << 1) | 1]); 293 } 294 295 static void 296 set_tt_5380_reg(u_short rnum, u_short val) 297 { 298 SCSI_5380->scsi_5380[(rnum << 1) | 1] = val; 299 } 300 301 extern __inline__ void 302 scsi_tt_ienable(void) 303 { 304 if (machineid & ATARI_TT) 305 single_inst_bset_b(MFP2->mf_imrb, IB_SCDM); 306 single_inst_bset_b(MFP2->mf_imra, IA_SCSI); 307 } 308 309 extern __inline__ void 310 scsi_tt_idisable(void) 311 { 312 if (machineid & ATARI_TT) 313 single_inst_bclr_b(MFP2->mf_imrb, IB_SCDM); 314 single_inst_bclr_b(MFP2->mf_imra, IA_SCSI); 315 } 316 317 extern __inline__ void 318 scsi_tt_clr_ipend(void) 319 { 320 int tmp; 321 322 SCSI_DMA->s_dma_ctrl = 0; 323 tmp = GET_TT_REG(NCR5380_IRCV); 324 if (machineid & ATARI_TT) 325 MFP2->mf_iprb = (u_int8_t)~IB_SCDM; 326 MFP2->mf_ipra = (u_int8_t)~IA_SCSI; 327 328 /* 329 * Remove interrupts already scheduled. 330 */ 331 rem_sicallback((si_farg)ncr_ctrl_intr); 332 rem_sicallback((si_farg)ncr_dma_intr); 333 } 334 335 static void 336 scsi_tt_dmasetup(SC_REQ *reqp, u_int phase, u_char mode) 337 { 338 if (PH_IN(phase)) { 339 SCSI_DMA->s_dma_ctrl = SD_IN; 340 if (machineid & ATARI_HADES) 341 SCSI_DMA->s_hdma_ctrl &= ~(SDH_BUSERR|SDH_EOP); 342 set_scsi_dma(&(SCSI_DMA->s_dma_ptr), reqp->dm_cur->dm_addr); 343 set_scsi_dma(&(SCSI_DMA->s_dma_cnt), reqp->dm_cur->dm_count); 344 SET_TT_REG(NCR5380_ICOM, 0); 345 SET_TT_REG(NCR5380_MODE, mode); 346 SCSI_DMA->s_dma_ctrl = SD_ENABLE; 347 SET_TT_REG(NCR5380_IRCV, 0); 348 } 349 else { 350 SCSI_DMA->s_dma_ctrl = SD_OUT; 351 if (machineid & ATARI_HADES) 352 SCSI_DMA->s_hdma_ctrl &= ~(SDH_BUSERR|SDH_EOP); 353 set_scsi_dma(&(SCSI_DMA->s_dma_ptr), reqp->dm_cur->dm_addr); 354 set_scsi_dma(&(SCSI_DMA->s_dma_cnt), reqp->dm_cur->dm_count); 355 SET_TT_REG(NCR5380_MODE, mode); 356 SET_TT_REG(NCR5380_ICOM, SC_ADTB); 357 SET_TT_REG(NCR5380_DMSTAT, 0); 358 SCSI_DMA->s_dma_ctrl = SD_ENABLE|SD_OUT; 359 } 360 } 361 362 static int 363 tt_poll_edma(SC_REQ *reqp) 364 { 365 u_char dmstat, dmastat; 366 int timeout = 9000; /* XXX */ 367 368 /* 369 * We wait here until the DMA has finished. This can be 370 * achieved by checking the following conditions: 371 * - 5380: 372 * - End of DMA flag is set 373 * - We lost BSY (error!!) 374 * - A phase mismatch has occurred (partial transfer) 375 * - DMA-controller: 376 * - A bus error occurred (Kernel error!!) 377 * - All bytes are transferred 378 * If one of the terminating conditions was met, we call 379 * 'dma_ready' to check errors and perform the bookkeeping. 380 */ 381 382 scsi_tt_idisable(); 383 for (;;) { 384 delay(20); 385 if (--timeout <= 0) { 386 ncr_tprint(reqp, "timeout on polled transfer\n"); 387 reqp->xs->error = XS_TIMEOUT; 388 scsi_tt_ienable(); 389 return(0); 390 } 391 dmstat = GET_TT_REG(NCR5380_DMSTAT); 392 393 if ((machineid & ATARI_HADES) && (dmstat & SC_DMA_REQ)) { 394 ncr5380_drq_intr(1); 395 dmstat = GET_TT_REG(NCR5380_DMSTAT); 396 } 397 398 dmastat = SCSI_DMA->s_dma_ctrl; 399 if (dmstat & (SC_END_DMA|SC_BSY_ERR|SC_IRQ_SET)) 400 break; 401 if (!(dmstat & SC_PHS_MTCH)) 402 break; 403 if (dmastat & (SD_BUSERR|SD_ZERO)) 404 break; 405 } 406 scsi_tt_ienable(); 407 return(1); 408 } 409 410 /* 411 * Convert physical DMA address to a virtual address. 412 */ 413 static u_char * 414 ptov(SC_REQ *reqp, u_long *phaddr) 415 { 416 struct dma_chain *dm; 417 u_char *vaddr; 418 419 dm = reqp->dm_chain; 420 vaddr = reqp->xdata_ptr; 421 for(; dm < reqp->dm_cur; dm++) 422 vaddr += dm->dm_count; 423 vaddr += (u_long)phaddr - dm->dm_addr; 424 return(vaddr); 425 } 426 427 static int 428 tt_get_dma_result(SC_REQ *reqp, u_long *bytes_left) 429 { 430 int dmastat, dmstat; 431 u_char *byte_p; 432 u_long leftover; 433 434 dmastat = SCSI_DMA->s_dma_ctrl; 435 dmstat = GET_TT_REG(NCR5380_DMSTAT); 436 get_scsi_dma(SCSI_DMA->s_dma_cnt, leftover); 437 get_scsi_dma(SCSI_DMA->s_dma_ptr, (u_long)byte_p); 438 439 if (dmastat & SD_BUSERR) { 440 /* 441 * The DMA-controller seems to access 8 bytes beyond 442 * it's limits on output. Therefore check also the byte 443 * count. If it's zero, ignore the bus error. 444 */ 445 if (leftover != 0) { 446 ncr_tprint(reqp, 447 "SCSI-DMA buserror - accessing 0x%x\n", byte_p); 448 reqp->xs->error = XS_DRIVER_STUFFUP; 449 } 450 } 451 452 /* 453 * We handle the following special condition below: 454 * -- The device disconnects in the middle of a write operation -- 455 * In this case, the 5380 has already pre-fetched the next byte from 456 * the DMA-controller before the phase mismatch occurs. Therefore, 457 * leftover is 1 too low. 458 * This does not always happen! Therefore, we only do this when 459 * leftover is odd. This assumes that DMA transfers are _even_! This 460 * is normally the case on disks and types but might not always be. 461 * XXX: Check if ACK is consistently high on these occasions LWP 462 */ 463 if ((leftover & 1) && !(dmstat & SC_PHS_MTCH) && PH_OUT(reqp->phase)) 464 leftover++; 465 466 /* 467 * Check if there are some 'restbytes' left in the DMA-controller. 468 */ 469 if ((machineid & ATARI_TT) && ((u_long)byte_p & 3) 470 && PH_IN(reqp->phase)) { 471 u_char *p, *q; 472 473 p = ptov(reqp, (u_long *)((u_long)byte_p & ~3)); 474 q = (u_char*)&(SCSI_DMA->s_dma_res); 475 switch ((u_long)byte_p & 3) { 476 case 3: *p++ = *q++; 477 case 2: *p++ = *q++; 478 case 1: *p++ = *q++; 479 } 480 } 481 *bytes_left = leftover; 482 return ((dmastat & (SD_BUSERR|SD_ZERO)) ? 1 : 0); 483 } 484 485 static u_char *dma_ptr; 486 void 487 ncr5380_drq_intr(poll) 488 int poll; 489 { 490 extern int *nofault; 491 label_t faultbuf; 492 int write; 493 u_long count; 494 u_char *data_p = (u_char*)(stio_addr+0x741); 495 496 /* 497 * Block SCSI interrupts while emulating DMA. They come 498 * at a higher priority. 499 */ 500 single_inst_bclr_b(MFP2->mf_imra, IA_SCSI); 501 502 /* 503 * Setup for a possible bus error caused by SCSI controller 504 * switching out of DATA-IN/OUT before we're done with the 505 * current transfer. 506 */ 507 nofault = (int *) &faultbuf; 508 509 if (setjmp((label_t *) nofault)) { 510 u_char *ptr; 511 u_long cnt, tmp; 512 513 PID("drq berr"); 514 nofault = (int *) 0; 515 516 /* 517 * Determine number of bytes transferred 518 */ 519 get_scsi_dma(SCSI_DMA->s_dma_ptr, (u_long)ptr); 520 cnt = dma_ptr - ptr; 521 522 if (cnt != 0) { 523 /* 524 * Update the dma pointer/count fields 525 */ 526 set_scsi_dma(SCSI_DMA->s_dma_ptr, dma_ptr); 527 get_scsi_dma(SCSI_DMA->s_dma_cnt, tmp); 528 set_scsi_dma(SCSI_DMA->s_dma_cnt, tmp - cnt); 529 530 if (tmp > cnt) { 531 /* 532 * Still more to transfer 533 */ 534 if (!poll) 535 single_inst_bset_b(MFP2->mf_imra, IA_SCSI); 536 return; 537 } 538 539 /* 540 * Signal EOP to 5380 541 */ 542 SCSI_DMA->s_hdma_ctrl |= SDH_EOP; 543 } 544 else { 545 nofault = (int *) &faultbuf; 546 547 /* 548 * Try to figure out if the byte-count was 549 * zero because there was no (more) data or 550 * because the dma_ptr is bogus. 551 */ 552 if (setjmp((label_t *) nofault)) { 553 /* 554 * Set the bus-error bit 555 */ 556 SCSI_DMA->s_hdma_ctrl |= SDH_BUSERR; 557 } 558 __asm __volatile ("tstb %0@(0)": : "a" (dma_ptr)); 559 nofault = (int *)0; 560 } 561 562 /* 563 * Schedule an interrupt 564 */ 565 if (!poll && (SCSI_DMA->s_dma_ctrl & SD_ENABLE)) 566 add_sicallback((si_farg)ncr_dma_intr, (void *)cur_softc, 0); 567 568 /* 569 * Clear DMA-mode 570 */ 571 SCSI_DMA->s_dma_ctrl &= ~SD_ENABLE; 572 if (!poll) 573 single_inst_bset_b(MFP2->mf_imra, IA_SCSI); 574 575 return; 576 } 577 578 write = (SCSI_DMA->s_dma_ctrl & SD_OUT) ? 1 : 0; 579 #if DBG_PID 580 if (write) { 581 PID("drq (in)"); 582 } else { 583 PID("drq (out)"); 584 } 585 #endif 586 587 get_scsi_dma(SCSI_DMA->s_dma_cnt, count); 588 get_scsi_dma(SCSI_DMA->s_dma_ptr, (u_long)dma_ptr); 589 590 /* 591 * Keep pushing bytes until we're done or a bus-error 592 * signals that the SCSI controller is not ready. 593 * NOTE: I tried some optimalizations in these loops, 594 * but they had no effect on transfer speed. 595 */ 596 if (write) { 597 while(count--) { 598 *data_p = *dma_ptr++; 599 } 600 } 601 else { 602 while(count--) { 603 *dma_ptr++ = *data_p; 604 } 605 } 606 607 /* 608 * OK. No bus error occurred above. Clear the nofault flag 609 * so we no longer short-circuit bus errors. 610 */ 611 nofault = (int *) 0; 612 613 /* 614 * Schedule an interrupt 615 */ 616 if (!poll && (SCSI_DMA->s_dma_ctrl & SD_ENABLE)) 617 add_sicallback((si_farg)ncr_dma_intr, (void *)cur_softc, 0); 618 619 /* 620 * Clear DMA-mode 621 */ 622 SCSI_DMA->s_dma_ctrl &= ~SD_ENABLE; 623 624 /* 625 * Update the DMA 'registers' to reflect that all bytes 626 * have been transfered and tell this to the 5380 too. 627 */ 628 set_scsi_dma(SCSI_DMA->s_dma_ptr, (u_long)dma_ptr); 629 set_scsi_dma(SCSI_DMA->s_dma_cnt, 0); 630 SCSI_DMA->s_hdma_ctrl |= SDH_EOP; 631 632 PID("end drq"); 633 if (!poll) 634 single_inst_bset_b(MFP2->mf_imra, IA_SCSI); 635 636 return; 637 } 638 639 #endif /* defined(TT_SCSI) */ 640 641 #if defined(FALCON_SCSI) && !defined(TT_SCSI) 642 643 #define GET_5380_REG(rnum) get_falcon_5380_reg(rnum) 644 #define SET_5380_REG(rnum,val) set_falcon_5380_reg(rnum, val) 645 #define scsi_mach_init(sc) scsi_falcon_init(sc) 646 #define scsi_ienable() scsi_falcon_ienable() 647 #define scsi_idisable() scsi_falcon_idisable() 648 #define scsi_clr_ipend() scsi_falcon_clr_ipend() 649 #define scsi_ipending() scsi_falcon_ipending() 650 #define scsi_dma_setup(r,p,m) scsi_falcon_dmasetup(r, p, m) 651 #define wrong_dma_range(r,d) falcon_wrong_dma_range(r, d) 652 #define poll_edma(reqp) falcon_poll_edma(reqp) 653 #define get_dma_result(r, b) falcon_get_dma_result(r, b) 654 #define can_access_5380() falcon_can_access_5380() 655 #define emulated_dma() 0 656 657 #define fair_to_keep_dma() (!st_dmawanted()) 658 #define claimed_dma() falcon_claimed_dma() 659 #define reconsider_dma() falcon_reconsider_dma() 660 661 #endif /* defined(FALCON_SCSI) && !defined(TT_SCSI) */ 662 663 #if defined(FALCON_SCSI) 664 665 /* 666 * Prototype functions defined below 667 */ 668 static void scsi_falcon_init __P((struct ncr_softc *)); 669 static u_char get_falcon_5380_reg __P((u_short)); 670 static void set_falcon_5380_reg __P((u_short, u_short)); 671 static int falcon_wrong_dma_range __P((SC_REQ *, struct dma_chain *)); 672 static void fal1_dma __P((u_int, u_int, SC_REQ *)); 673 static void scsi_falcon_dmasetup __P((SC_REQ *, u_int, u_char)); 674 static int falcon_poll_edma __P((SC_REQ *)); 675 static int falcon_get_dma_result __P((SC_REQ *, u_long *)); 676 int falcon_can_access_5380 __P((void)); 677 void scsi_falcon_clr_ipend __P((void)); 678 void scsi_falcon_idisable __P((void)); 679 void scsi_falcon_ienable __P((void)); 680 int scsi_falcon_ipending __P((void)); 681 int falcon_claimed_dma __P((void)); 682 void falcon_reconsider_dma __P((void)); 683 684 static void 685 scsi_falcon_init(sc) 686 struct ncr_softc *sc; 687 { 688 /* 689 * Enable disk related interrupts 690 */ 691 MFP->mf_ierb |= IB_DINT; 692 MFP->mf_iprb = (u_int8_t)~IB_DINT; 693 MFP->mf_imrb |= IB_DINT; 694 } 695 696 static u_char 697 get_falcon_5380_reg(rnum) 698 u_short rnum; 699 { 700 DMA->dma_mode = DMA_SCSI + rnum; 701 return(DMA->dma_data); 702 } 703 704 static void 705 set_falcon_5380_reg(rnum, val) 706 u_short rnum, val; 707 { 708 DMA->dma_mode = DMA_SCSI + rnum; 709 DMA->dma_data = val; 710 } 711 712 extern __inline__ void 713 scsi_falcon_ienable() 714 { 715 single_inst_bset_b(MFP->mf_imrb, IB_DINT); 716 } 717 718 extern __inline__ void 719 scsi_falcon_idisable() 720 { 721 single_inst_bclr_b(MFP->mf_imrb, IB_DINT); 722 } 723 724 extern __inline__ void 725 scsi_falcon_clr_ipend() 726 { 727 int tmp; 728 729 tmp = get_falcon_5380_reg(NCR5380_IRCV); 730 rem_sicallback((si_farg)ncr_ctrl_intr); 731 } 732 733 extern __inline__ int 734 scsi_falcon_ipending() 735 { 736 if (connected && (connected->dr_flag & DRIVER_IN_DMA)) { 737 /* 738 * XXX: When DMA is running, we are only allowed to 739 * check the 5380 when DMA _might_ be finished. 740 */ 741 if (MFP->mf_gpip & IO_DINT) 742 return (0); /* XXX: Actually: we're not allowed to check */ 743 744 /* LWP: 28-06, must be a dma interrupt! should the 745 * ST-DMA unit be taken out of dma mode????? 746 */ 747 DMA->dma_mode = 0x90; 748 749 } 750 return(get_falcon_5380_reg(NCR5380_DMSTAT) & SC_IRQ_SET); 751 } 752 753 static int 754 falcon_wrong_dma_range(reqp, dm) 755 SC_REQ *reqp; 756 struct dma_chain *dm; 757 { 758 /* 759 * Do not allow chains yet! See also comment with 760 * falcon_poll_edma() !!! 761 */ 762 if (((dm - reqp->dm_chain) > 0) || (dm->dm_addr & 0xff000000)) { 763 reqp->dr_flag |= DRIVER_BOUNCING; 764 return(1); 765 } 766 /* 767 * Never allow DMA to happen on a Falcon when the transfer 768 * size is no multiple of 512. This is the transfer unit of the 769 * ST DMA-controller. 770 */ 771 if(dm->dm_count & 511) 772 return(1); 773 return(0); 774 } 775 776 static int falcon_lock = 0; 777 778 extern __inline__ int 779 falcon_claimed_dma() 780 { 781 if (falcon_lock != DMA_LOCK_GRANT) { 782 if (falcon_lock == DMA_LOCK_REQ) { 783 /* 784 * DMA access is being claimed. 785 */ 786 return(0); 787 } 788 if (!st_dmagrab((dma_farg)ncr_ctrl_intr, (dma_farg)run_main, 789 cur_softc, &falcon_lock, 1)) 790 return(0); 791 } 792 return(1); 793 } 794 795 extern __inline__ void 796 falcon_reconsider_dma() 797 { 798 if (falcon_lock && (connected == NULL) && (discon_q == NULL)) { 799 /* 800 * No need to keep DMA locked by us as we are not currently 801 * connected and no disconnected jobs are pending. 802 */ 803 rem_sicallback((si_farg)ncr_ctrl_intr); 804 st_dmafree(cur_softc, &falcon_lock); 805 } 806 807 if (!falcon_lock && (issue_q != NULL)) { 808 /* 809 * We must (re)claim DMA access as there are jobs 810 * waiting in the issue queue. 811 */ 812 st_dmagrab((dma_farg)ncr_ctrl_intr, (dma_farg)run_main, 813 cur_softc, &falcon_lock, 0); 814 } 815 } 816 817 static void 818 fal1_dma(dir, nsects, reqp) 819 u_int dir, nsects; 820 SC_REQ *reqp; 821 { 822 dir <<= 8; 823 st_dmaaddr_set((caddr_t)reqp->dm_cur->dm_addr); 824 DMA->dma_mode = 0x90 | dir; 825 DMA->dma_mode = 0x90 | (dir ^ DMA_WRBIT); 826 DMA->dma_mode = 0x90 | dir; 827 DMA->dma_data = nsects; 828 delay(2); /* _really_ needed (Thomas Gerner) */ 829 DMA->dma_mode = 0x10 | dir; 830 } 831 832 static void 833 scsi_falcon_dmasetup(reqp, phase, mode) 834 SC_REQ *reqp; 835 u_int phase; 836 u_char mode; 837 { 838 int nsects = reqp->dm_cur->dm_count / 512; /* XXX */ 839 840 /* 841 * XXX: We should probably clear the fifo before putting the 842 * 5380 into DMA-mode. 843 */ 844 if (PH_IN(phase)) { 845 set_falcon_5380_reg(NCR5380_ICOM, 0); 846 set_falcon_5380_reg(NCR5380_MODE, mode); 847 set_falcon_5380_reg(NCR5380_IRCV, 0); 848 fal1_dma(0, nsects, reqp); 849 } 850 else { 851 set_falcon_5380_reg(NCR5380_MODE, mode); 852 set_falcon_5380_reg(NCR5380_ICOM, SC_ADTB); 853 set_falcon_5380_reg(NCR5380_DMSTAT, 0); 854 fal1_dma(1, nsects, reqp); 855 } 856 } 857 858 static int 859 falcon_poll_edma(reqp) 860 SC_REQ *reqp; 861 { 862 int timeout = 9000; /* XXX */ 863 864 /* 865 * Because of the Falcon hardware, it is impossible to reach 866 * the 5380 while doing DMA-transfers. So we have to rely on 867 * the interrupt line to determine if DMA-has finished. the 868 * DMA-controller itself will never fire an interrupt. This means 869 * that 'broken-up' DMA transfers are not (yet) possible on the 870 * Falcon. 871 */ 872 for (;;) { 873 delay(20); 874 if (--timeout <= 0) { 875 ncr_tprint(reqp, "Timeout on polled transfer\n"); 876 reqp->xs->error = XS_TIMEOUT; 877 return(0); 878 } 879 if (!(MFP->mf_gpip & IO_DINT)) 880 break; 881 } 882 return(1); 883 } 884 885 static int 886 falcon_get_dma_result(reqp, bytes_left) 887 SC_REQ *reqp; 888 u_long *bytes_left; 889 { 890 int rv = 0; 891 int st_dmastat; 892 u_long bytes_done; 893 894 /* 895 * Select sector counter register first (See Atari docu.) 896 */ 897 DMA->dma_mode = 0x90; 898 if (!(st_dmastat = DMA->dma_stat) & 0x01) { 899 /* 900 * Misc. DMA-error according to Atari... 901 */ 902 ncr_tprint(reqp, "Unknow ST-SCSI error near 0x%x\n", 903 st_dmaaddr_get()); 904 reqp->xs->error = XS_DRIVER_STUFFUP; 905 rv = 1; 906 } 907 /* 908 * Because we NEVER start DMA on the Falcon when the data size 909 * is not a multiple of 512 bytes, we can safely round down the 910 * byte count on writes. We need to because in case of a disconnect, 911 * the DMA has already prefetched the next couple of bytes. 912 * On read, these byte counts are an error. They are logged and 913 * should be handled by the mi-part of the driver. 914 * NOTE: We formerly did this by using the 'byte-count-zero' bit 915 * of the DMA controller, but this didn't seem to work??? 916 * [lwp 29/06/96] 917 */ 918 bytes_done = st_dmaaddr_get() - reqp->dm_cur->dm_addr; 919 if (bytes_done & 511) { 920 if (PH_IN(reqp->phase)) { 921 ncr_tprint(reqp, "Byte count on read not a multiple " 922 "of 512 (%ld)\n", bytes_done); 923 } 924 bytes_done &= ~511; 925 } 926 if ((*bytes_left = reqp->dm_cur->dm_count - bytes_done) == 0) 927 rv = 1; 928 return(rv); 929 } 930 931 static int 932 falcon_can_access_5380() 933 { 934 if (connected && (connected->dr_flag & DRIVER_IN_DMA) 935 && (MFP->mf_gpip & IO_DINT)) 936 return(0); 937 return(1); 938 } 939 940 #endif /* defined(FALCON_SCSI) */ 941 942 #if defined(TT_SCSI) && defined(FALCON_SCSI) 943 /* 944 * Define some functions to support _both_ TT and Falcon SCSI 945 */ 946 947 /* 948 * The prototypes first... 949 */ 950 static void scsi_mach_init __P((struct ncr_softc *)); 951 void scsi_ienable __P((void)); 952 void scsi_idisable __P((void)); 953 void scsi_clr_ipend __P((void)); 954 int scsi_ipending __P((void)); 955 void scsi_dma_setup __P((SC_REQ *, u_int, u_char)); 956 int wrong_dma_range __P((SC_REQ *, struct dma_chain *)); 957 int poll_edma __P((SC_REQ *)); 958 int get_dma_result __P((SC_REQ *, u_long *)); 959 int can_access_5380 __P((void)); 960 961 /* 962 * Register access will be done through the following 2 function pointers. 963 */ 964 static u_char (*get_5380_reg) __P((u_short)); 965 static void (*set_5380_reg) __P((u_short, u_short)); 966 967 #define GET_5380_REG (*get_5380_reg) 968 #define SET_5380_REG (*set_5380_reg) 969 970 static void 971 scsi_mach_init(sc) 972 struct ncr_softc *sc; 973 { 974 if (machineid & ATARI_FALCON) { 975 get_5380_reg = get_falcon_5380_reg; 976 set_5380_reg = set_falcon_5380_reg; 977 scsi_falcon_init(sc); 978 } 979 else { 980 get_5380_reg = get_tt_5380_reg; 981 set_5380_reg = set_tt_5380_reg; 982 scsi_tt_init(sc); 983 } 984 } 985 986 extern __inline__ void 987 scsi_ienable() 988 { 989 if (machineid & ATARI_FALCON) 990 scsi_falcon_ienable(); 991 else scsi_tt_ienable(); 992 } 993 994 extern __inline__ void 995 scsi_idisable() 996 { 997 if (machineid & ATARI_FALCON) 998 scsi_falcon_idisable(); 999 else scsi_tt_idisable(); 1000 } 1001 1002 extern __inline__ void 1003 scsi_clr_ipend() 1004 { 1005 if (machineid & ATARI_FALCON) 1006 scsi_falcon_clr_ipend(); 1007 else scsi_tt_clr_ipend(); 1008 } 1009 1010 extern __inline__ int 1011 scsi_ipending() 1012 { 1013 if (machineid & ATARI_FALCON) 1014 return(scsi_falcon_ipending()); 1015 else return (GET_TT_REG(NCR5380_DMSTAT) & SC_IRQ_SET); 1016 } 1017 1018 extern __inline__ void 1019 scsi_dma_setup(reqp, phase, mbase) 1020 SC_REQ *reqp; 1021 u_int phase; 1022 u_char mbase; 1023 { 1024 if (machineid & ATARI_FALCON) 1025 scsi_falcon_dmasetup(reqp, phase, mbase); 1026 else scsi_tt_dmasetup(reqp, phase, mbase); 1027 } 1028 1029 extern __inline__ int 1030 wrong_dma_range(reqp, dm) 1031 SC_REQ *reqp; 1032 struct dma_chain *dm; 1033 { 1034 if (machineid & ATARI_FALCON) 1035 return(falcon_wrong_dma_range(reqp, dm)); 1036 else return(tt_wrong_dma_range(reqp, dm)); 1037 } 1038 1039 extern __inline__ int 1040 poll_edma(reqp) 1041 SC_REQ *reqp; 1042 { 1043 if (machineid & ATARI_FALCON) 1044 return(falcon_poll_edma(reqp)); 1045 else return(tt_poll_edma(reqp)); 1046 } 1047 1048 extern __inline__ int 1049 get_dma_result(reqp, bytes_left) 1050 SC_REQ *reqp; 1051 u_long *bytes_left; 1052 { 1053 if (machineid & ATARI_FALCON) 1054 return(falcon_get_dma_result(reqp, bytes_left)); 1055 else return(tt_get_dma_result(reqp, bytes_left)); 1056 } 1057 1058 extern __inline__ int 1059 can_access_5380() 1060 { 1061 if (machineid & ATARI_FALCON) 1062 return(falcon_can_access_5380()); 1063 return(1); 1064 } 1065 1066 #define emulated_dma() ((machineid & ATARI_HADES) ? 1 : 0) 1067 1068 /* 1069 * Locking stuff. All turns into NOP's on the TT. 1070 */ 1071 #define fair_to_keep_dma() ((machineid & ATARI_FALCON) ? \ 1072 !st_dmawanted() : 1) 1073 #define claimed_dma() ((machineid & ATARI_FALCON) ? \ 1074 falcon_claimed_dma() : 1) 1075 #define reconsider_dma() { \ 1076 if(machineid & ATARI_FALCON) \ 1077 falcon_reconsider_dma();\ 1078 } 1079 #endif /* defined(TT_SCSI) && defined(FALCON_SCSI) */ 1080 1081 /********************************************** 1082 * Functions present for both TT and Falcon. * 1083 **********************************************/ 1084 /* 1085 * Our autoconfig matching function 1086 */ 1087 static int 1088 machine_match(struct device *pdp, void *match, void *auxp, 1089 struct cfdriver *cd) 1090 { 1091 static int we_matched = 0; /* Only one unit */ 1092 1093 if (strcmp(auxp, cd->cd_name) || we_matched) 1094 return(0); 1095 1096 we_matched = 1; 1097 return(1); 1098 } 1099 1100 /* 1101 * Bounce buffer (de)allocation. Those buffers are gotten from the ST-mem 1102 * pool. Allocation here is both contiguous and in the lower 16Mb of 1103 * the address space. Thus being DMA-able for all controllers. 1104 */ 1105 static u_char * 1106 alloc_bounceb(u_long len) 1107 { 1108 void *tmp; 1109 1110 return((u_char *)alloc_stmem(len, &tmp)); 1111 } 1112 1113 static void 1114 free_bounceb(u_char *bounceb) 1115 { 1116 free_stmem(bounceb); 1117 } 1118 1119 /* 1120 * 5380 interrupt. 1121 */ 1122 void 1123 scsi_ctrl(int sr) 1124 { 1125 if (GET_5380_REG(NCR5380_DMSTAT) & SC_IRQ_SET) { 1126 scsi_idisable(); 1127 if (!BASEPRI(sr)) 1128 add_sicallback((si_farg)ncr_ctrl_intr, 1129 (void *)cur_softc, 0); 1130 else { 1131 spl1(); 1132 ncr_ctrl_intr(cur_softc); 1133 spl0(); 1134 } 1135 } 1136 } 1137 1138 /* 1139 * DMA controller interrupt 1140 */ 1141 void 1142 scsi_dma(int sr) 1143 { 1144 SC_REQ *reqp; 1145 1146 if ((reqp = connected) && (reqp->dr_flag & DRIVER_IN_DMA)) { 1147 scsi_idisable(); 1148 if (!BASEPRI(sr)) 1149 add_sicallback((si_farg)ncr_dma_intr, 1150 (void *)cur_softc, 0); 1151 else { 1152 spl1(); 1153 ncr_dma_intr(cur_softc); 1154 spl0(); 1155 } 1156 } 1157 } 1158 1159 /* 1160 * Last but not least... Include the general driver code 1161 */ 1162 #include <atari/dev/ncr5380.c> 1163
Indexes created Wed Sep 24 05:09:52 GMT 2025