atari5380.c revision 1.26.4.1
1 /* $NetBSD: atari5380.c,v 1.26.4.1 1997/08/27 22:21:42 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 <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/kernel.h> 36 #include <sys/device.h> 37 #include <sys/buf.h> 38 #include <dev/scsipi/scsi_all.h> 39 #include <dev/scsipi/scsipi_all.h> 40 #include <dev/scsipi/scsi_message.h> 41 #include <dev/scsipi/scsiconf.h> 42 43 #include <m68k/asm_single.h> 44 #include <m68k/cpu.h> 45 #include <m68k/cacheops.h> 46 47 #include <atari/atari/stalloc.h> 48 49 /* 50 * Include the driver definitions 51 */ 52 #include <atari/dev/ncr5380reg.h> 53 54 #include <machine/stdarg.h> 55 #include <machine/iomap.h> 56 #include <machine/mfp.h> 57 58 #include <atari/atari/intr.h> 59 60 #if defined(FALCON_SCSI) 61 #include <machine/dma.h> 62 #endif 63 64 /* 65 * Set the various driver options 66 */ 67 #define NREQ 18 /* Size of issue queue */ 68 #define AUTO_SENSE 1 /* Automatically issue a request-sense */ 69 70 #define DRNAME ncrscsi /* used in various prints */ 71 #undef DBG_SEL /* Show the selection process */ 72 #undef DBG_REQ /* Show enqueued/ready requests */ 73 #undef DBG_ERR_RET /* Show requests with != 0 return code */ 74 #undef DBG_NOWRITE /* Do not allow writes to the targets */ 75 #undef DBG_PIO /* Show the polled-I/O process */ 76 #undef DBG_INF /* Show information transfer process */ 77 #define DBG_NOSTATIC /* No static functions, all in DDB trace*/ 78 #define DBG_PID 15 /* Keep track of driver */ 79 #define REAL_DMA /* Use DMA if sensible */ 80 #if defined(FALCON_SCSI) 81 #define REAL_DMA_POLL 1 /* 1: Poll for end of DMA-transfer */ 82 #else 83 #define REAL_DMA_POLL 0 /* 1: Poll for end of DMA-transfer */ 84 #endif 85 #undef USE_PDMA /* Use special pdma-transfer function */ 86 #define MIN_PHYS 65536 /*BARF!!!!*/ 87 88 /* 89 * Include more driver definitions 90 */ 91 #include <atari/dev/ncr5380var.h> 92 93 /* 94 * The atari specific driver options 95 */ 96 #undef NO_TTRAM_DMA /* Do not use DMA to TT-ram. This */ 97 /* fails on older atari's */ 98 #define ENABLE_NCR5380(sc) cur_softc = sc; 99 100 static u_char *alloc_bounceb __P((u_long)); 101 static void free_bounceb __P((u_char *)); 102 static int machine_match __P((struct device *, void *, void *, 103 struct cfdriver *)); 104 void scsi_ctrl __P((int)); 105 void scsi_dma __P((int)); 106 107 /* 108 * Functions that do nothing on the atari 109 */ 110 #define pdma_ready() 0 111 112 #if defined(TT_SCSI) 113 114 void ncr5380_drq_intr __P((int)); 115 116 /* 117 * Define all the things we need of the DMA-controller 118 */ 119 #define SCSI_DMA ((struct scsi_dma *)AD_SCSI_DMA) 120 #define SCSI_5380 ((struct scsi_5380 *)AD_NCR5380) 121 122 struct scsi_dma { 123 volatile u_char s_dma_ptr[8]; /* use only the odd bytes */ 124 volatile u_char s_dma_cnt[8]; /* use only the odd bytes */ 125 volatile u_char s_dma_res[4]; /* data residue register */ 126 volatile u_char s_dma_gap; /* not used */ 127 volatile u_char s_dma_ctrl; /* control register */ 128 volatile u_char s_dma_gap2; /* not used */ 129 volatile u_char s_hdma_ctrl; /* Hades control register */ 130 }; 131 132 #define set_scsi_dma(addr, val) (void)( \ 133 { \ 134 u_char *address = (u_char*)addr+1; \ 135 u_long nval = (u_long)val; \ 136 __asm("movepl %0, %1@(0)": :"d" (nval), "a" (address)); \ 137 }) 138 139 #define get_scsi_dma(addr, res) ( \ 140 { \ 141 u_char *address = (u_char*)addr+1; \ 142 u_long nval; \ 143 __asm("movepl %1@(0), %0": "=d" (nval) : "a" (address)); \ 144 res = (u_long)nval; \ 145 }) 146 147 /* 148 * Defines for TT-DMA control register 149 */ 150 #define SD_BUSERR 0x80 /* 1 = transfer caused bus error*/ 151 #define SD_ZERO 0x40 /* 1 = byte counter is zero */ 152 #define SD_ENABLE 0x02 /* 1 = Enable DMA */ 153 #define SD_OUT 0x01 /* Direction: memory to SCSI */ 154 #define SD_IN 0x00 /* Direction: SCSI to memory */ 155 156 /* 157 * Defines for Hades-DMA control register 158 */ 159 #define SDH_BUSERR 0x02 /* 1 = Bus error */ 160 #define SDH_EOP 0x01 /* 1 = Signal EOP on 5380 */ 161 #define SDH_ZERO 0x40 /* 1 = Byte counter is zero */ 162 163 /* 164 * Define the 5380 register set 165 */ 166 struct scsi_5380 { 167 volatile u_char scsi_5380[16]; /* use only the odd bytes */ 168 }; 169 #endif /* TT_SCSI */ 170 171 /********************************************** 172 * Variables present for both TT and Falcon. * 173 **********************************************/ 174 175 /* 176 * Softc of currently active controller (a bit of fake; we only have one) 177 */ 178 static struct ncr_softc *cur_softc; 179 180 #if defined(TT_SCSI) && !defined(FALCON_SCSI) 181 /* 182 * We can be more efficient for some functions when only TT_SCSI is selected 183 */ 184 #define GET_5380_REG(rnum) SCSI_5380->scsi_5380[(rnum << 1) | 1] 185 #define SET_5380_REG(rnum,val) (SCSI_5380->scsi_5380[(rnum << 1) | 1] = val) 186 187 #define scsi_mach_init(sc) scsi_tt_init(sc) 188 #define scsi_ienable() scsi_tt_ienable() 189 #define scsi_idisable() scsi_tt_idisable() 190 #define scsi_clr_ipend() scsi_tt_clr_ipend() 191 #define scsi_ipending() (GET_5380_REG(NCR5380_DMSTAT) & SC_IRQ_SET) 192 #define scsi_dma_setup(r,p,m) scsi_tt_dmasetup(r, p, m) 193 #define wrong_dma_range(r,d) tt_wrong_dma_range(r, d) 194 #define poll_edma(reqp) tt_poll_edma(reqp) 195 #define get_dma_result(r, b) tt_get_dma_result(r, b) 196 #define can_access_5380() 1 197 #define emulated_dma() ((machineid & ATARI_HADES) ? 1 : 0) 198 199 #define fair_to_keep_dma() 1 200 #define claimed_dma() 1 201 #define reconsider_dma() 202 203 #endif /* defined(TT_SCSI) && !defined(FALCON_SCSI) */ 204 205 #if defined(TT_SCSI) 206 207 /* 208 * Prototype functions defined below 209 */ 210 #ifdef NO_TTRAM_DMA 211 static int tt_wrong_dma_range __P((SC_REQ *, struct dma_chain *)); 212 #endif 213 static void scsi_tt_init __P((struct ncr_softc *)); 214 static u_char get_tt_5380_reg __P((u_short)); 215 static void set_tt_5380_reg __P((u_short, u_short)); 216 static void scsi_tt_dmasetup __P((SC_REQ *, u_int, u_char)); 217 static int tt_poll_edma __P((SC_REQ *)); 218 static u_char *ptov __P((SC_REQ *, u_long*)); 219 static int tt_get_dma_result __P((SC_REQ *, u_long *)); 220 void scsi_tt_ienable __P((void)); 221 void scsi_tt_idisable __P((void)); 222 void scsi_tt_clr_ipend __P((void)); 223 224 /* 225 * Define these too, so we can use them locally... 226 */ 227 #define GET_TT_REG(rnum) SCSI_5380->scsi_5380[(rnum << 1) | 1] 228 #define SET_TT_REG(rnum,val) (SCSI_5380->scsi_5380[(rnum << 1) | 1] = val) 229 230 #ifdef NO_TTRAM_DMA 231 static int 232 tt_wrong_dma_range(reqp, dm) 233 SC_REQ *reqp; 234 struct dma_chain *dm; 235 { 236 if (dm->dm_addr & 0xff000000) { 237 reqp->dr_flag |= DRIVER_BOUNCING; 238 return(1); 239 } 240 return(0); 241 } 242 #else 243 #define tt_wrong_dma_range(reqp, dm) 0 244 #endif 245 246 static void 247 scsi_tt_init(struct ncr_softc *sc) 248 { 249 /* 250 * Enable SCSI-related interrupts 251 */ 252 MFP2->mf_aer |= 0x80; /* SCSI IRQ goes HIGH!!!!! */ 253 254 if (machineid & ATARI_TT) { 255 /* SCSI-dma interrupts */ 256 MFP2->mf_ierb |= IB_SCDM; 257 MFP2->mf_iprb &= ~IB_SCDM; 258 MFP2->mf_imrb |= IB_SCDM; 259 } 260 else if (machineid & ATARI_HADES) { 261 SCSI_DMA->s_hdma_ctrl = 0; 262 263 if (intr_establish(2, AUTO_VEC, 0, 264 (hw_ifun_t)ncr5380_drq_intr, 265 NULL) == NULL) 266 panic("scsi_tt_init: Can't establish drq-interrupt"); 267 } 268 else panic("scsi_tt_init: should not come here"); 269 270 MFP2->mf_iera |= IA_SCSI; /* SCSI-5380 interrupts */ 271 MFP2->mf_ipra &= ~IA_SCSI; 272 MFP2->mf_imra |= IA_SCSI; 273 274 /* 275 * LWP: DMA transfers to TT-ram causes data to be garbeled 276 * without notice on some revisons of the TT-mainboard. 277 * When program's generate misterious Segmentations faults, 278 * try turning on NO_TTRAM_DMA. 279 */ 280 #ifdef NO_TTRAM_DMA 281 printf(": DMA to TT-RAM is disabled!"); 282 #endif 283 } 284 285 static u_char 286 get_tt_5380_reg(u_short rnum) 287 { 288 return(SCSI_5380->scsi_5380[(rnum << 1) | 1]); 289 } 290 291 static void 292 set_tt_5380_reg(u_short rnum, u_short val) 293 { 294 SCSI_5380->scsi_5380[(rnum << 1) | 1] = val; 295 } 296 297 extern __inline__ void 298 scsi_tt_ienable(void) 299 { 300 if (machineid & ATARI_TT) 301 single_inst_bset_b(MFP2->mf_imrb, IB_SCDM); 302 single_inst_bset_b(MFP2->mf_imra, IA_SCSI); 303 } 304 305 extern __inline__ void 306 scsi_tt_idisable(void) 307 { 308 if (machineid & ATARI_TT) 309 single_inst_bclr_b(MFP2->mf_imrb, IB_SCDM); 310 single_inst_bclr_b(MFP2->mf_imra, IA_SCSI); 311 } 312 313 extern __inline__ void 314 scsi_tt_clr_ipend(void) 315 { 316 int tmp; 317 318 SCSI_DMA->s_dma_ctrl = 0; 319 tmp = GET_TT_REG(NCR5380_IRCV); 320 if (machineid & ATARI_TT) 321 single_inst_bclr_b(MFP2->mf_iprb, IB_SCDM); 322 single_inst_bclr_b(MFP2->mf_ipra, IA_SCSI); 323 324 /* 325 * Remove interrupts already scheduled. 326 */ 327 rem_sicallback((si_farg)ncr_ctrl_intr); 328 rem_sicallback((si_farg)ncr_dma_intr); 329 } 330 331 static void 332 scsi_tt_dmasetup(SC_REQ *reqp, u_int phase, u_char mode) 333 { 334 if (PH_IN(phase)) { 335 SCSI_DMA->s_dma_ctrl = SD_IN; 336 if (machineid & ATARI_HADES) 337 SCSI_DMA->s_hdma_ctrl &= ~(SDH_BUSERR|SDH_EOP); 338 set_scsi_dma(&(SCSI_DMA->s_dma_ptr), reqp->dm_cur->dm_addr); 339 set_scsi_dma(&(SCSI_DMA->s_dma_cnt), reqp->dm_cur->dm_count); 340 SET_TT_REG(NCR5380_ICOM, 0); 341 SET_TT_REG(NCR5380_MODE, mode); 342 SCSI_DMA->s_dma_ctrl = SD_ENABLE; 343 SET_TT_REG(NCR5380_IRCV, 0); 344 } 345 else { 346 SCSI_DMA->s_dma_ctrl = SD_OUT; 347 if (machineid & ATARI_HADES) 348 SCSI_DMA->s_hdma_ctrl &= ~(SDH_BUSERR|SDH_EOP); 349 set_scsi_dma(&(SCSI_DMA->s_dma_ptr), reqp->dm_cur->dm_addr); 350 set_scsi_dma(&(SCSI_DMA->s_dma_cnt), reqp->dm_cur->dm_count); 351 SET_TT_REG(NCR5380_MODE, mode); 352 SET_TT_REG(NCR5380_ICOM, SC_ADTB); 353 SET_TT_REG(NCR5380_DMSTAT, 0); 354 SCSI_DMA->s_dma_ctrl = SD_ENABLE|SD_OUT; 355 } 356 } 357 358 static int 359 tt_poll_edma(SC_REQ *reqp) 360 { 361 u_char dmstat, dmastat; 362 int timeout = 9000; /* XXX */ 363 364 /* 365 * We wait here until the DMA has finished. This can be 366 * achieved by checking the following conditions: 367 * - 5380: 368 * - End of DMA flag is set 369 * - We lost BSY (error!!) 370 * - A phase mismatch has occured (partial transfer) 371 * - DMA-controller: 372 * - A bus error occurred (Kernel error!!) 373 * - All bytes are transferred 374 * If one of the terminating conditions was met, we call 375 * 'dma_ready' to check errors and perform the bookkeeping. 376 */ 377 378 for (;;) { 379 delay(20); 380 if (--timeout <= 0) { 381 ncr_tprint(reqp, "timeout on polled transfer\n"); 382 reqp->xs->error = XS_TIMEOUT; 383 return(0); 384 } 385 dmstat = GET_TT_REG(NCR5380_DMSTAT); 386 387 if ((machineid & ATARI_HADES) && (dmstat & SC_DMA_REQ)) { 388 ncr5380_drq_intr(1); 389 dmstat = GET_TT_REG(NCR5380_DMSTAT); 390 } 391 392 dmastat = SCSI_DMA->s_dma_ctrl; 393 if (dmstat & (SC_END_DMA|SC_BSY_ERR|SC_IRQ_SET)) 394 break; 395 if (!(dmstat & SC_PHS_MTCH)) 396 break; 397 if (dmastat & (SD_BUSERR|SD_ZERO)) 398 break; 399 } 400 return(1); 401 } 402 403 /* 404 * Convert physical DMA address to a virtual address. 405 */ 406 static u_char * 407 ptov(SC_REQ *reqp, u_long *phaddr) 408 { 409 struct dma_chain *dm; 410 u_char *vaddr; 411 412 dm = reqp->dm_chain; 413 vaddr = reqp->xdata_ptr; 414 for(; dm < reqp->dm_cur; dm++) 415 vaddr += dm->dm_count; 416 vaddr += (u_long)phaddr - dm->dm_addr; 417 return(vaddr); 418 } 419 420 static int 421 tt_get_dma_result(SC_REQ *reqp, u_long *bytes_left) 422 { 423 int dmastat, dmstat; 424 u_char *byte_p; 425 u_long leftover; 426 427 dmastat = SCSI_DMA->s_dma_ctrl; 428 dmstat = GET_TT_REG(NCR5380_DMSTAT); 429 get_scsi_dma(SCSI_DMA->s_dma_cnt, leftover); 430 get_scsi_dma(SCSI_DMA->s_dma_ptr, (u_long)byte_p); 431 432 if (dmastat & SD_BUSERR) { 433 /* 434 * The DMA-controller seems to access 8 bytes beyond 435 * it's limits on output. Therefore check also the byte 436 * count. If it's zero, ignore the bus error. 437 */ 438 if (leftover != 0) { 439 ncr_tprint(reqp, 440 "SCSI-DMA buserror - accessing 0x%x\n", byte_p); 441 reqp->xs->error = XS_DRIVER_STUFFUP; 442 } 443 } 444 445 /* 446 * We handle the following special condition below: 447 * -- The device disconnects in the middle of a write operation -- 448 * In this case, the 5380 has already pre-fetched the next byte from 449 * the DMA-controller before the phase mismatch occurs. Therefore, 450 * leftover is 1 too low. 451 * This does not always happen! Therefore, we only do this when 452 * leftover is odd. This assumes that DMA transfers are _even_! This 453 * is normally the case on disks and types but might not always be. 454 * XXX: Check if ACK is consistently high on these occasions LWP 455 */ 456 if ((leftover & 1) && !(dmstat & SC_PHS_MTCH) && PH_OUT(reqp->phase)) 457 leftover++; 458 459 /* 460 * Check if there are some 'restbytes' left in the DMA-controller. 461 */ 462 if ((machineid & ATARI_TT) && ((u_long)byte_p & 3) 463 && PH_IN(reqp->phase)) { 464 u_char *p, *q; 465 466 p = ptov(reqp, (u_long *)((u_long)byte_p & ~3)); 467 q = (u_char*)&(SCSI_DMA->s_dma_res); 468 switch ((u_long)byte_p & 3) { 469 case 3: *p++ = *q++; 470 case 2: *p++ = *q++; 471 case 1: *p++ = *q++; 472 } 473 } 474 *bytes_left = leftover; 475 return ((dmastat & (SD_BUSERR|SD_ZERO)) ? 1 : 0); 476 } 477 478 static u_char *dma_ptr; 479 void 480 ncr5380_drq_intr(poll) 481 int poll; 482 { 483 extern int *nofault; 484 label_t faultbuf; 485 int write; 486 u_long count; 487 u_char *data_p = (u_char*)(stio_addr+0x741); 488 489 /* 490 * Block SCSI interrupts while emulating DMA. They come 491 * at a higher priority. 492 */ 493 single_inst_bclr_b(MFP2->mf_imra, IA_SCSI); 494 495 /* 496 * Setup for a possible bus error caused by SCSI controller 497 * switching out of DATA-IN/OUT before we're done with the 498 * current transfer. 499 */ 500 nofault = (int *) &faultbuf; 501 502 if (setjmp((label_t *) nofault)) { 503 u_char *ptr; 504 u_long cnt, tmp; 505 506 PID("drq berr"); 507 nofault = (int *) 0; 508 509 /* 510 * Determine number of bytes transferred 511 */ 512 get_scsi_dma(SCSI_DMA->s_dma_ptr, (u_long)ptr); 513 cnt = dma_ptr - ptr; 514 515 if (cnt != 0) { 516 /* 517 * Update the dma pointer/count fields 518 */ 519 set_scsi_dma(SCSI_DMA->s_dma_ptr, dma_ptr); 520 get_scsi_dma(SCSI_DMA->s_dma_cnt, tmp); 521 set_scsi_dma(SCSI_DMA->s_dma_cnt, tmp - cnt); 522 523 if (tmp > cnt) { 524 /* 525 * Still more to transfer 526 */ 527 if (!poll) 528 single_inst_bset_b(MFP2->mf_imra, IA_SCSI); 529 return; 530 } 531 532 /* 533 * Signal EOP to 5380 534 */ 535 SCSI_DMA->s_hdma_ctrl |= SDH_EOP; 536 } 537 else { 538 nofault = (int *) &faultbuf; 539 540 /* 541 * Try to figure out if the byte-count was 542 * zero because there was no (more) data or 543 * because the dma_ptr is bogus. 544 */ 545 if (setjmp((label_t *) nofault)) { 546 /* 547 * Set the bus-error bit 548 */ 549 SCSI_DMA->s_hdma_ctrl |= SDH_BUSERR; 550 } 551 __asm __volatile ("tstb %0@(0)": : "a" (dma_ptr)); 552 nofault = (int *)0; 553 } 554 555 /* 556 * Schedule an interrupt 557 */ 558 if (!poll && (SCSI_DMA->s_dma_ctrl & SD_ENABLE)) 559 add_sicallback((si_farg)ncr_dma_intr, (void *)cur_softc, 0); 560 561 /* 562 * Clear DMA-mode 563 */ 564 SCSI_DMA->s_dma_ctrl &= ~SD_ENABLE; 565 if (!poll) 566 single_inst_bset_b(MFP2->mf_imra, IA_SCSI); 567 568 return; 569 } 570 571 write = (SCSI_DMA->s_dma_ctrl & SD_OUT) ? 1 : 0; 572 #if DBG_PID 573 if (write) { 574 PID("drq (in)"); 575 } else { 576 PID("drq (out)"); 577 } 578 #endif 579 580 get_scsi_dma(SCSI_DMA->s_dma_cnt, count); 581 get_scsi_dma(SCSI_DMA->s_dma_ptr, (u_long)dma_ptr); 582 583 /* 584 * Keep pushing bytes until we're done or a bus-error 585 * signals that the SCSI controller is not ready. 586 * NOTE: I tried some optimalizations in these loops, 587 * but they had no effect on transfer speed. 588 */ 589 if (write) { 590 while(count--) { 591 *data_p = *dma_ptr++; 592 } 593 } 594 else { 595 while(count--) { 596 *dma_ptr++ = *data_p; 597 } 598 } 599 600 /* 601 * Schedule an interrupt 602 */ 603 if (!poll && (SCSI_DMA->s_dma_ctrl & SD_ENABLE)) 604 add_sicallback((si_farg)ncr_dma_intr, (void *)cur_softc, 0); 605 606 /* 607 * Clear DMA-mode 608 */ 609 SCSI_DMA->s_dma_ctrl &= ~SD_ENABLE; 610 611 /* 612 * OK. No bus error occurred above. Clear the nofault flag 613 * so we no longer short-circuit bus errors. 614 */ 615 nofault = (int *) 0; 616 617 /* 618 * Update the DMA 'registers' to reflect that all bytes 619 * have been transfered and tell this to the 5380 too. 620 */ 621 set_scsi_dma(SCSI_DMA->s_dma_ptr, (u_long)dma_ptr); 622 set_scsi_dma(SCSI_DMA->s_dma_cnt, 0); 623 SCSI_DMA->s_hdma_ctrl |= SDH_EOP; 624 625 PID("end drq"); 626 if (!poll) 627 single_inst_bset_b(MFP2->mf_imra, IA_SCSI); 628 629 return; 630 } 631 632 #endif /* defined(TT_SCSI) */ 633 634 #if defined(FALCON_SCSI) && !defined(TT_SCSI) 635 636 #define GET_5380_REG(rnum) get_falcon_5380_reg(rnum) 637 #define SET_5380_REG(rnum,val) set_falcon_5380_reg(rnum, val) 638 #define scsi_mach_init(sc) scsi_falcon_init(sc) 639 #define scsi_ienable() scsi_falcon_ienable() 640 #define scsi_idisable() scsi_falcon_idisable() 641 #define scsi_clr_ipend() scsi_falcon_clr_ipend() 642 #define scsi_ipending() scsi_falcon_ipending() 643 #define scsi_dma_setup(r,p,m) scsi_falcon_dmasetup(r, p, m) 644 #define wrong_dma_range(r,d) falcon_wrong_dma_range(r, d) 645 #define poll_edma(reqp) falcon_poll_edma(reqp) 646 #define get_dma_result(r, b) falcon_get_dma_result(r, b) 647 #define can_access_5380() falcon_can_access_5380() 648 #define emulated_dma() 0 649 650 #define fair_to_keep_dma() (!st_dmawanted()) 651 #define claimed_dma() falcon_claimed_dma() 652 #define reconsider_dma() falcon_reconsider_dma() 653 654 #endif /* defined(FALCON_SCSI) && !defined(TT_SCSI) */ 655 656 #if defined(FALCON_SCSI) 657 658 /* 659 * Prototype functions defined below 660 */ 661 static void scsi_falcon_init __P((struct ncr_softc *)); 662 static u_char get_falcon_5380_reg __P((u_short)); 663 static void set_falcon_5380_reg __P((u_short, u_short)); 664 static int falcon_wrong_dma_range __P((SC_REQ *, struct dma_chain *)); 665 static void fal1_dma __P((u_int, u_int, SC_REQ *)); 666 static void scsi_falcon_dmasetup __P((SC_REQ *, u_int, u_char)); 667 static int falcon_poll_edma __P((SC_REQ *)); 668 static int falcon_get_dma_result __P((SC_REQ *, u_long *)); 669 int falcon_can_access_5380 __P((void)); 670 void scsi_falcon_clr_ipend __P((void)); 671 void scsi_falcon_idisable __P((void)); 672 void scsi_falcon_ienable __P((void)); 673 int scsi_falcon_ipending __P((void)); 674 int falcon_claimed_dma __P((void)); 675 void falcon_reconsider_dma __P((void)); 676 677 static void 678 scsi_falcon_init(sc) 679 struct ncr_softc *sc; 680 { 681 /* 682 * Enable disk related interrupts 683 */ 684 MFP->mf_ierb |= IB_DINT; 685 MFP->mf_iprb &= ~IB_DINT; 686 MFP->mf_imrb |= IB_DINT; 687 } 688 689 static u_char 690 get_falcon_5380_reg(rnum) 691 u_short rnum; 692 { 693 DMA->dma_mode = DMA_SCSI + rnum; 694 return(DMA->dma_data); 695 } 696 697 static void 698 set_falcon_5380_reg(rnum, val) 699 u_short rnum, val; 700 { 701 DMA->dma_mode = DMA_SCSI + rnum; 702 DMA->dma_data = val; 703 } 704 705 extern __inline__ void 706 scsi_falcon_ienable() 707 { 708 single_inst_bset_b(MFP->mf_imrb, IB_DINT); 709 } 710 711 extern __inline__ void 712 scsi_falcon_idisable() 713 { 714 single_inst_bclr_b(MFP->mf_imrb, IB_DINT); 715 } 716 717 extern __inline__ void 718 scsi_falcon_clr_ipend() 719 { 720 int tmp; 721 722 tmp = get_falcon_5380_reg(NCR5380_IRCV); 723 rem_sicallback((si_farg)ncr_ctrl_intr); 724 } 725 726 extern __inline__ int 727 scsi_falcon_ipending() 728 { 729 if (connected && (connected->dr_flag & DRIVER_IN_DMA)) { 730 /* 731 * XXX: When DMA is running, we are only allowed to 732 * check the 5380 when DMA _might_ be finished. 733 */ 734 if (MFP->mf_gpip & IO_DINT) 735 return (0); /* XXX: Actually: we're not allowed to check */ 736 737 /* LWP: 28-06, must be a dma interrupt! should the 738 * ST-DMA unit be taken out of dma mode????? 739 */ 740 DMA->dma_mode = 0x90; 741 742 } 743 return(get_falcon_5380_reg(NCR5380_DMSTAT) & SC_IRQ_SET); 744 } 745 746 static int 747 falcon_wrong_dma_range(reqp, dm) 748 SC_REQ *reqp; 749 struct dma_chain *dm; 750 { 751 /* 752 * Do not allow chains yet! See also comment with 753 * falcon_poll_edma() !!! 754 */ 755 if (((dm - reqp->dm_chain) > 0) || (dm->dm_addr & 0xff000000)) { 756 reqp->dr_flag |= DRIVER_BOUNCING; 757 return(1); 758 } 759 /* 760 * Never allow DMA to happen on a Falcon when the transfer 761 * size is no multiple of 512. This is the transfer unit of the 762 * ST DMA-controller. 763 */ 764 if(dm->dm_count & 511) 765 return(1); 766 return(0); 767 } 768 769 static int falcon_lock = 0; 770 771 extern __inline__ int 772 falcon_claimed_dma() 773 { 774 if (falcon_lock != DMA_LOCK_GRANT) { 775 if (falcon_lock == DMA_LOCK_REQ) { 776 /* 777 * DMA access is being claimed. 778 */ 779 return(0); 780 } 781 if (!st_dmagrab((dma_farg)ncr_ctrl_intr, (dma_farg)run_main, 782 cur_softc, &falcon_lock, 1)) 783 return(0); 784 } 785 return(1); 786 } 787 788 extern __inline__ void 789 falcon_reconsider_dma() 790 { 791 if (falcon_lock && (connected == NULL) && (discon_q == NULL)) { 792 /* 793 * No need to keep DMA locked by us as we are not currently 794 * connected and no disconnected jobs are pending. 795 */ 796 rem_sicallback((si_farg)ncr_ctrl_intr); 797 st_dmafree(cur_softc, &falcon_lock); 798 } 799 800 if (!falcon_lock && (issue_q != NULL)) { 801 /* 802 * We must (re)claim DMA access as there are jobs 803 * waiting in the issue queue. 804 */ 805 st_dmagrab((dma_farg)ncr_ctrl_intr, (dma_farg)run_main, 806 cur_softc, &falcon_lock, 0); 807 } 808 } 809 810 static void 811 fal1_dma(dir, nsects, reqp) 812 u_int dir, nsects; 813 SC_REQ *reqp; 814 { 815 dir <<= 8; 816 st_dmaaddr_set((caddr_t)reqp->dm_cur->dm_addr); 817 DMA->dma_mode = 0x90 | dir; 818 DMA->dma_mode = 0x90 | (dir ^ DMA_WRBIT); 819 DMA->dma_mode = 0x90 | dir; 820 DMA->dma_data = nsects; 821 delay(2); /* _really_ needed (Thomas Gerner) */ 822 DMA->dma_mode = 0x10 | dir; 823 } 824 825 static void 826 scsi_falcon_dmasetup(reqp, phase, mode) 827 SC_REQ *reqp; 828 u_int phase; 829 u_char mode; 830 { 831 int nsects = reqp->dm_cur->dm_count / 512; /* XXX */ 832 833 /* 834 * XXX: We should probably clear the fifo before putting the 835 * 5380 into DMA-mode. 836 */ 837 if (PH_IN(phase)) { 838 set_falcon_5380_reg(NCR5380_ICOM, 0); 839 set_falcon_5380_reg(NCR5380_MODE, mode); 840 set_falcon_5380_reg(NCR5380_IRCV, 0); 841 fal1_dma(0, nsects, reqp); 842 } 843 else { 844 set_falcon_5380_reg(NCR5380_MODE, mode); 845 set_falcon_5380_reg(NCR5380_ICOM, SC_ADTB); 846 set_falcon_5380_reg(NCR5380_DMSTAT, 0); 847 fal1_dma(1, nsects, reqp); 848 } 849 } 850 851 static int 852 falcon_poll_edma(reqp) 853 SC_REQ *reqp; 854 { 855 int timeout = 9000; /* XXX */ 856 857 /* 858 * Because of the Falcon hardware, it is impossible to reach 859 * the 5380 while doing DMA-transfers. So we have to rely on 860 * the interrupt line to determine if DMA-has finished. the 861 * DMA-controller itself will never fire an interrupt. This means 862 * that 'broken-up' DMA transfers are not (yet) possible on the 863 * Falcon. 864 */ 865 for (;;) { 866 delay(20); 867 if (--timeout <= 0) { 868 ncr_tprint(reqp, "Timeout on polled transfer\n"); 869 reqp->xs->error = XS_TIMEOUT; 870 return(0); 871 } 872 if (!(MFP->mf_gpip & IO_DINT)) 873 break; 874 } 875 return(1); 876 } 877 878 static int 879 falcon_get_dma_result(reqp, bytes_left) 880 SC_REQ *reqp; 881 u_long *bytes_left; 882 { 883 int rv = 0; 884 int st_dmastat; 885 u_long bytes_done; 886 887 /* 888 * Select sector counter register first (See Atari docu.) 889 */ 890 DMA->dma_mode = 0x90; 891 if (!(st_dmastat = DMA->dma_stat) & 0x01) { 892 /* 893 * Misc. DMA-error according to Atari... 894 */ 895 ncr_tprint(reqp, "Unknow ST-SCSI error near 0x%x\n", 896 st_dmaaddr_get()); 897 reqp->xs->error = XS_DRIVER_STUFFUP; 898 rv = 1; 899 } 900 /* 901 * Because we NEVER start DMA on the Falcon when the data size 902 * is not a multiple of 512 bytes, we can safely round down the 903 * byte count on writes. We need to because in case of a disconnect, 904 * the DMA has already prefetched the next couple of bytes. 905 * On read, these byte counts are an error. They are logged and 906 * should be handled by the mi-part of the driver. 907 * NOTE: We formerly did this by using the 'byte-count-zero' bit 908 * of the DMA controller, but this didn't seem to work??? 909 * [lwp 29/06/96] 910 */ 911 bytes_done = st_dmaaddr_get() - reqp->dm_cur->dm_addr; 912 if (bytes_done & 511) { 913 if (PH_IN(reqp->phase)) { 914 ncr_tprint(reqp, "Byte count on read not a multiple " 915 "of 512 (%ld)\n", bytes_done); 916 } 917 bytes_done &= ~511; 918 } 919 if ((*bytes_left = reqp->dm_cur->dm_count - bytes_done) == 0) 920 rv = 1; 921 return(rv); 922 } 923 924 static int 925 falcon_can_access_5380() 926 { 927 if (connected && (connected->dr_flag & DRIVER_IN_DMA) 928 && (MFP->mf_gpip & IO_DINT)) 929 return(0); 930 return(1); 931 } 932 933 #endif /* defined(FALCON_SCSI) */ 934 935 #if defined(TT_SCSI) && defined(FALCON_SCSI) 936 /* 937 * Define some functions to support _both_ TT and Falcon SCSI 938 */ 939 940 /* 941 * The prototypes first... 942 */ 943 static void scsi_mach_init __P((struct ncr_softc *)); 944 void scsi_ienable __P((void)); 945 void scsi_idisable __P((void)); 946 void scsi_clr_ipend __P((void)); 947 int scsi_ipending __P((void)); 948 void scsi_dma_setup __P((SC_REQ *, u_int, u_char)); 949 int wrong_dma_range __P((SC_REQ *, struct dma_chain *)); 950 int poll_edma __P((SC_REQ *)); 951 int get_dma_result __P((SC_REQ *, u_long *)); 952 int can_access_5380 __P((void)); 953 954 /* 955 * Register access will be done through the following 2 function pointers. 956 */ 957 static u_char (*get_5380_reg) __P((u_short)); 958 static void (*set_5380_reg) __P((u_short, u_short)); 959 960 #define GET_5380_REG (*get_5380_reg) 961 #define SET_5380_REG (*set_5380_reg) 962 963 static void 964 scsi_mach_init(sc) 965 struct ncr_softc *sc; 966 { 967 if (machineid & ATARI_FALCON) { 968 get_5380_reg = get_falcon_5380_reg; 969 set_5380_reg = set_falcon_5380_reg; 970 scsi_falcon_init(sc); 971 } 972 else { 973 get_5380_reg = get_tt_5380_reg; 974 set_5380_reg = set_tt_5380_reg; 975 scsi_tt_init(sc); 976 } 977 } 978 979 extern __inline__ void 980 scsi_ienable() 981 { 982 if (machineid & ATARI_FALCON) 983 scsi_falcon_ienable(); 984 else scsi_tt_ienable(); 985 } 986 987 extern __inline__ void 988 scsi_idisable() 989 { 990 if (machineid & ATARI_FALCON) 991 scsi_falcon_idisable(); 992 else scsi_tt_idisable(); 993 } 994 995 extern __inline__ void 996 scsi_clr_ipend() 997 { 998 if (machineid & ATARI_FALCON) 999 scsi_falcon_clr_ipend(); 1000 else scsi_tt_clr_ipend(); 1001 } 1002 1003 extern __inline__ int 1004 scsi_ipending() 1005 { 1006 if (machineid & ATARI_FALCON) 1007 return(scsi_falcon_ipending()); 1008 else return (GET_TT_REG(NCR5380_DMSTAT) & SC_IRQ_SET); 1009 } 1010 1011 extern __inline__ void 1012 scsi_dma_setup(reqp, phase, mbase) 1013 SC_REQ *reqp; 1014 u_int phase; 1015 u_char mbase; 1016 { 1017 if (machineid & ATARI_FALCON) 1018 scsi_falcon_dmasetup(reqp, phase, mbase); 1019 else scsi_tt_dmasetup(reqp, phase, mbase); 1020 } 1021 1022 extern __inline__ int 1023 wrong_dma_range(reqp, dm) 1024 SC_REQ *reqp; 1025 struct dma_chain *dm; 1026 { 1027 if (machineid & ATARI_FALCON) 1028 return(falcon_wrong_dma_range(reqp, dm)); 1029 else return(tt_wrong_dma_range(reqp, dm)); 1030 } 1031 1032 extern __inline__ int 1033 poll_edma(reqp) 1034 SC_REQ *reqp; 1035 { 1036 if (machineid & ATARI_FALCON) 1037 return(falcon_poll_edma(reqp)); 1038 else return(tt_poll_edma(reqp)); 1039 } 1040 1041 extern __inline__ int 1042 get_dma_result(reqp, bytes_left) 1043 SC_REQ *reqp; 1044 u_long *bytes_left; 1045 { 1046 if (machineid & ATARI_FALCON) 1047 return(falcon_get_dma_result(reqp, bytes_left)); 1048 else return(tt_get_dma_result(reqp, bytes_left)); 1049 } 1050 1051 extern __inline__ int 1052 can_access_5380() 1053 { 1054 if (machineid & ATARI_FALCON) 1055 return(falcon_can_access_5380()); 1056 return(1); 1057 } 1058 1059 #define emulated_dma() ((machineid & ATARI_HADES) ? 1 : 0) 1060 1061 /* 1062 * Locking stuff. All turns into NOP's on the TT. 1063 */ 1064 #define fair_to_keep_dma() ((machineid & ATARI_FALCON) ? \ 1065 !st_dmawanted() : 1) 1066 #define claimed_dma() ((machineid & ATARI_FALCON) ? \ 1067 falcon_claimed_dma() : 1) 1068 #define reconsider_dma() { \ 1069 if(machineid & ATARI_FALCON) \ 1070 falcon_reconsider_dma();\ 1071 } 1072 #endif /* defined(TT_SCSI) && defined(FALCON_SCSI) */ 1073 1074 /********************************************** 1075 * Functions present for both TT and Falcon. * 1076 **********************************************/ 1077 /* 1078 * Our autoconfig matching function 1079 */ 1080 static int 1081 machine_match(struct device *pdp, void *match, void *auxp, 1082 struct cfdriver *cd) 1083 { 1084 struct cfdata *cdp = match; 1085 1086 if (strcmp(auxp, cd->cd_name)) 1087 return(0); 1088 if (cdp->cf_unit != 0) /* Only one unit */ 1089 return(0); 1090 return(1); 1091 } 1092 1093 /* 1094 * Bounce buffer (de)allocation. Those buffers are gotten from the ST-mem 1095 * pool. Allocation here is both contiguous and in the lower 16Mb of 1096 * the address space. Thus being DMA-able for all controllers. 1097 */ 1098 static u_char * 1099 alloc_bounceb(u_long len) 1100 { 1101 void *tmp; 1102 1103 return((u_char *)alloc_stmem(len, &tmp)); 1104 } 1105 1106 static void 1107 free_bounceb(u_char *bounceb) 1108 { 1109 free_stmem(bounceb); 1110 } 1111 1112 /* 1113 * 5380 interrupt. 1114 */ 1115 void 1116 scsi_ctrl(int sr) 1117 { 1118 if (GET_5380_REG(NCR5380_DMSTAT) & SC_IRQ_SET) { 1119 scsi_idisable(); 1120 if (!BASEPRI(sr)) 1121 add_sicallback((si_farg)ncr_ctrl_intr, 1122 (void *)cur_softc, 0); 1123 else { 1124 spl1(); 1125 ncr_ctrl_intr(cur_softc); 1126 spl0(); 1127 } 1128 } 1129 } 1130 1131 /* 1132 * DMA controller interrupt 1133 */ 1134 void 1135 scsi_dma(int sr) 1136 { 1137 SC_REQ *reqp; 1138 1139 if ((reqp = connected) && (reqp->dr_flag & DRIVER_IN_DMA)) { 1140 scsi_idisable(); 1141 if (!BASEPRI(sr)) 1142 add_sicallback((si_farg)ncr_dma_intr, 1143 (void *)cur_softc, 0); 1144 else { 1145 spl1(); 1146 ncr_dma_intr(cur_softc); 1147 spl0(); 1148 } 1149 } 1150 } 1151 1152 /* 1153 * Last but not least... Include the general driver code 1154 */ 1155 #include <atari/dev/ncr5380.c> 1156
Indexes created Mon Sep 29 21:09:56 GMT 2025