1 /* $NetBSD: asc_tcds.c,v 1.26 2018/09/03 16:29:33 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1994 Peter Galbavy. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. All advertising materials mentioning features or use of this software 45 * must display the following acknowledgement: 46 * This product includes software developed by Peter Galbavy. 47 * 4. The name of the author may not be used to endorse or promote products 48 * derived from this software without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 51 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 52 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 53 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 54 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 55 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 56 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 57 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 58 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 59 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 60 */ 61 62 #include <sys/cdefs.h> 63 __KERNEL_RCSID(0, "$NetBSD: asc_tcds.c,v 1.26 2018/09/03 16:29:33 riastradh Exp $"); 64 65 #include <sys/param.h> 66 #include <sys/systm.h> 67 #include <sys/device.h> 68 #include <sys/buf.h> 69 70 #include <dev/scsipi/scsi_all.h> 71 #include <dev/scsipi/scsipi_all.h> 72 #include <dev/scsipi/scsiconf.h> 73 74 #include <dev/ic/ncr53c9xreg.h> 75 #include <dev/ic/ncr53c9xvar.h> 76 77 #include <sys/bus.h> 78 79 #include <dev/tc/tcvar.h> 80 #include <dev/tc/tcdsreg.h> 81 #include <dev/tc/tcdsvar.h> 82 83 struct asc_softc { 84 struct ncr53c9x_softc sc_ncr53c9x; /* glue to MI code */ 85 bus_space_tag_t sc_bst; /* bus space tag */ 86 bus_space_handle_t sc_scsi_bsh; /* ASC register handle */ 87 bus_dma_tag_t sc_dmat; /* bus DMA tag */ 88 bus_dmamap_t sc_dmamap; /* bus dmamap */ 89 uint8_t **sc_dmaaddr; 90 size_t *sc_dmalen; 91 size_t sc_dmasize; 92 unsigned sc_flags; 93 #define ASC_ISPULLUP 0x01 94 #define ASC_DMAACTIVE 0x02 95 #define ASC_MAPLOADED 0x04 96 struct tcds_slotconfig *sc_tcds; /* DMA/slot info lives here */ 97 }; 98 99 static int asc_tcds_match(device_t, cfdata_t, void *); 100 static void asc_tcds_attach(device_t, device_t, void *); 101 102 CFATTACH_DECL_NEW(asc_tcds, sizeof(struct asc_softc), 103 asc_tcds_match, asc_tcds_attach, NULL, NULL); 104 105 /* 106 * Functions and the switch for the MI code. 107 */ 108 static uint8_t asc_read_reg(struct ncr53c9x_softc *, int); 109 static void asc_write_reg(struct ncr53c9x_softc *, int, uint8_t); 110 static int tcds_dma_isintr(struct ncr53c9x_softc *); 111 static void tcds_dma_reset(struct ncr53c9x_softc *); 112 static int tcds_dma_intr(struct ncr53c9x_softc *); 113 static int tcds_dma_setup(struct ncr53c9x_softc *, uint8_t **, 114 size_t *, int, size_t *); 115 static void tcds_dma_go(struct ncr53c9x_softc *); 116 static void tcds_dma_stop(struct ncr53c9x_softc *); 117 static int tcds_dma_isactive(struct ncr53c9x_softc *); 118 static void tcds_clear_latched_intr(struct ncr53c9x_softc *); 119 120 static struct ncr53c9x_glue asc_tcds_glue = { 121 asc_read_reg, 122 asc_write_reg, 123 tcds_dma_isintr, 124 tcds_dma_reset, 125 tcds_dma_intr, 126 tcds_dma_setup, 127 tcds_dma_go, 128 tcds_dma_stop, 129 tcds_dma_isactive, 130 tcds_clear_latched_intr, 131 }; 132 133 static int 134 asc_tcds_match(device_t parent, cfdata_t cf, void *aux) 135 { 136 137 /* We always exist. */ 138 return 1; 139 } 140 141 #define DMAMAX(a) (PAGE_SIZE - ((a) & (PAGE_SIZE - 1))) 142 143 /* 144 * Attach this instance, and then all the sub-devices 145 */ 146 static void 147 asc_tcds_attach(device_t parent, device_t self, void *aux) 148 { 149 struct asc_softc *asc = device_private(self); 150 struct ncr53c9x_softc *sc = &asc->sc_ncr53c9x; 151 struct tcdsdev_attach_args *tcdsdev = aux; 152 int error; 153 154 /* 155 * Set up glue for MI code early; we use some of it here. 156 */ 157 sc->sc_dev = self; 158 sc->sc_glue = &asc_tcds_glue; 159 160 asc->sc_bst = tcdsdev->tcdsda_bst; 161 asc->sc_scsi_bsh = tcdsdev->tcdsda_bsh; 162 asc->sc_tcds = tcdsdev->tcdsda_sc; 163 164 /* 165 * The TCDS ASIC cannot DMA across 8k boundaries, and this 166 * driver is written such that each DMA segment gets a new 167 * call to tcds_dma_setup(). Thus, the DMA map only needs 168 * to support 8k transfers. 169 */ 170 asc->sc_dmat = tcdsdev->tcdsda_dmat; 171 if ((error = bus_dmamap_create(asc->sc_dmat, PAGE_SIZE, 1, PAGE_SIZE, 172 PAGE_SIZE, BUS_DMA_NOWAIT, &asc->sc_dmamap)) < 0) { 173 aprint_error(": failed to create DMA map, error = %d\n", error); 174 return; 175 } 176 177 sc->sc_id = tcdsdev->tcdsda_id; 178 sc->sc_freq = tcdsdev->tcdsda_freq; 179 180 /* gimme MHz */ 181 sc->sc_freq /= 1000000; 182 183 tcds_intr_establish(parent, tcdsdev->tcdsda_chip, ncr53c9x_intr, sc); 184 185 /* 186 * XXX More of this should be in ncr53c9x_attach(), but 187 * XXX should we really poke around the chip that much in 188 * XXX the MI code? Think about this more... 189 */ 190 191 /* 192 * Set up static configuration info. 193 */ 194 sc->sc_cfg1 = sc->sc_id | NCRCFG1_PARENB; 195 sc->sc_cfg2 = NCRCFG2_SCSI2; 196 sc->sc_cfg3 = NCRCFG3_CDB; 197 if (sc->sc_freq > 25) 198 sc->sc_cfg3 |= NCRF9XCFG3_FCLK; 199 sc->sc_rev = tcdsdev->tcdsda_variant; 200 if (tcdsdev->tcdsda_fast) { 201 sc->sc_features |= NCR_F_FASTSCSI; 202 sc->sc_cfg3_fscsi = NCRF9XCFG3_FSCSI; 203 } 204 205 /* 206 * XXX minsync and maxxfer _should_ be set up in MI code, 207 * XXX but it appears to have some dependency on what sort 208 * XXX of DMA we're hooked up to, etc. 209 */ 210 211 /* 212 * This is the value used to start sync negotiations 213 * Note that the NCR register "SYNCTP" is programmed 214 * in "clocks per byte", and has a minimum value of 4. 215 * The SCSI period used in negotiation is one-fourth 216 * of the time (in nanoseconds) needed to transfer one byte. 217 * Since the chip's clock is given in MHz, we have the following 218 * formula: 4 * period = (1000 / freq) * 4 219 */ 220 sc->sc_minsync = (1000 / sc->sc_freq) * tcdsdev->tcdsda_period / 4; 221 222 sc->sc_maxxfer = 64 * 1024; 223 224 /* Do the common parts of attachment. */ 225 sc->sc_adapter.adapt_minphys = minphys; 226 sc->sc_adapter.adapt_request = ncr53c9x_scsipi_request; 227 ncr53c9x_attach(sc); 228 } 229 230 static void 231 tcds_dma_reset(struct ncr53c9x_softc *sc) 232 { 233 struct asc_softc *asc = (struct asc_softc *)sc; 234 235 /* TCDS SCSI disable/reset/enable. */ 236 tcds_scsi_reset(asc->sc_tcds); /* XXX */ 237 238 if (asc->sc_flags & ASC_MAPLOADED) 239 bus_dmamap_unload(asc->sc_dmat, asc->sc_dmamap); 240 asc->sc_flags &= ~(ASC_DMAACTIVE|ASC_MAPLOADED); 241 } 242 243 /* 244 * start a DMA transfer or keep it going 245 */ 246 int 247 tcds_dma_setup(struct ncr53c9x_softc *sc, uint8_t **addr, size_t *len, 248 int ispullup, size_t *dmasize) 249 { 250 struct asc_softc *asc = (struct asc_softc *)sc; 251 struct tcds_slotconfig *tcds = asc->sc_tcds; 252 size_t size; 253 uint32_t dic; 254 255 NCR_DMA(("tcds_dma %d: start %d@%p,%s\n", tcds->sc_slot, 256 (int)*asc->sc_dmalen, *asc->sc_dmaaddr, 257 (ispullup) ? "IN" : "OUT")); 258 259 /* 260 * the rules say we cannot transfer more than the limit 261 * of this DMA chip (64k) and we cannot cross a 8k boundary. 262 */ 263 size = uimin(*dmasize, DMAMAX((size_t)*addr)); 264 asc->sc_dmaaddr = addr; 265 asc->sc_dmalen = len; 266 asc->sc_flags = (ispullup) ? ASC_ISPULLUP : 0; 267 *dmasize = asc->sc_dmasize = size; 268 269 NCR_DMA(("dma_start: dmasize = %d\n", (int)size)); 270 271 if (size == 0) 272 return 0; 273 274 if (bus_dmamap_load(asc->sc_dmat, asc->sc_dmamap, *addr, size, 275 NULL, BUS_DMA_NOWAIT | (ispullup ? BUS_DMA_READ : BUS_DMA_WRITE))) { 276 /* 277 * XXX Should return an error, here, but the upper-layer 278 * XXX doesn't check the return value! 279 */ 280 panic("%s: dmamap load failed", __func__); 281 } 282 283 /* synchronize dmamap contents with memory image */ 284 bus_dmamap_sync(asc->sc_dmat, asc->sc_dmamap, 0, size, 285 (ispullup) ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE); 286 287 /* load address, set/clear unaligned transfer and read/write bits. */ 288 bus_space_write_4(tcds->sc_bst, tcds->sc_bsh, tcds->sc_sda, 289 asc->sc_dmamap->dm_segs[0].ds_addr >> 2); 290 dic = bus_space_read_4(tcds->sc_bst, tcds->sc_bsh, tcds->sc_dic); 291 dic &= ~TCDS_DIC_ADDRMASK; 292 dic |= asc->sc_dmamap->dm_segs[0].ds_addr & TCDS_DIC_ADDRMASK; 293 if (ispullup) 294 dic |= TCDS_DIC_WRITE; 295 else 296 dic &= ~TCDS_DIC_WRITE; 297 bus_space_write_4(tcds->sc_bst, tcds->sc_bsh, tcds->sc_dic, dic); 298 299 asc->sc_flags |= ASC_MAPLOADED; 300 return 0; 301 } 302 303 static void 304 tcds_dma_go(struct ncr53c9x_softc *sc) 305 { 306 struct asc_softc *asc = (struct asc_softc *)sc; 307 308 /* mark unit as DMA-active */ 309 asc->sc_flags |= ASC_DMAACTIVE; 310 311 /* start DMA */ 312 tcds_dma_enable(asc->sc_tcds, 1); 313 } 314 315 static void 316 tcds_dma_stop(struct ncr53c9x_softc *sc) 317 { 318 #if 0 319 struct asc_softc *asc = (struct asc_softc *)sc; 320 #endif 321 322 /* 323 * XXX STOP DMA HERE! 324 */ 325 } 326 327 /* 328 * Pseudo (chained) interrupt from the asc driver to kick the 329 * current running DMA transfer. Called from ncr53c9x_intr() 330 * for now. 331 * 332 * return 1 if it was a DMA continue. 333 */ 334 static int 335 tcds_dma_intr(struct ncr53c9x_softc *sc) 336 { 337 struct asc_softc *asc = (struct asc_softc *)sc; 338 struct tcds_slotconfig *tcds = asc->sc_tcds; 339 int trans, resid; 340 uint32_t tcl, tcm; 341 uint32_t dud, dudmask, *addr; 342 bus_addr_t pa; 343 344 NCR_DMA(("tcds_dma %d: intr", tcds->sc_slot)); 345 346 if (tcds_scsi_iserr(tcds)) 347 return 0; 348 349 /* This is an "assertion" :) */ 350 if ((asc->sc_flags & ASC_DMAACTIVE) == 0) 351 panic("%s: DMA wasn't active", __func__); 352 353 /* DMA has stopped */ 354 tcds_dma_enable(tcds, 0); 355 asc->sc_flags &= ~ASC_DMAACTIVE; 356 357 if (asc->sc_dmasize == 0) { 358 /* A "Transfer Pad" operation completed */ 359 tcl = NCR_READ_REG(sc, NCR_TCL); 360 tcm = NCR_READ_REG(sc, NCR_TCM); 361 NCR_DMA(("dma_intr: discarded %d bytes (tcl=%d, tcm=%d)\n", 362 tcl | (tcm << 8), tcl, tcm)); 363 return 0; 364 } 365 366 resid = 0; 367 if ((asc->sc_flags & ASC_ISPULLUP) == 0 && 368 (resid = (NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF)) != 0) { 369 NCR_DMA(("dma_intr: empty esp FIFO of %d ", resid)); 370 DELAY(1); 371 } 372 373 resid += (tcl = NCR_READ_REG(sc, NCR_TCL)); 374 resid += (tcm = NCR_READ_REG(sc, NCR_TCM)) << 8; 375 376 trans = asc->sc_dmasize - resid; 377 if (trans < 0) { /* transferred < 0 ? */ 378 printf("tcds_dma %d: xfer (%d) > req (%d)\n", 379 tcds->sc_slot, trans, (int)asc->sc_dmasize); 380 trans = asc->sc_dmasize; 381 } 382 383 NCR_DMA(("dma_intr: tcl=%d, tcm=%d; trans=%d, resid=%d\n", 384 tcl, tcm, trans, resid)); 385 386 *asc->sc_dmalen -= trans; 387 *asc->sc_dmaaddr += trans; 388 389 bus_dmamap_sync(asc->sc_dmat, asc->sc_dmamap, 390 0, asc->sc_dmamap->dm_mapsize, 391 (sc->sc_flags & ASC_ISPULLUP) ? 392 BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE); 393 394 /* 395 * Clean up unaligned DMAs into main memory. 396 */ 397 if (asc->sc_flags & ASC_ISPULLUP) { 398 /* Handle unaligned starting address, length. */ 399 dud = bus_space_read_4(tcds->sc_bst, 400 tcds->sc_bsh, tcds->sc_dud0); 401 if ((dud & TCDS_DUD0_VALIDBITS) != 0) { 402 addr = (uint32_t *)((paddr_t)*asc->sc_dmaaddr & ~0x3); 403 dudmask = 0; 404 if (dud & TCDS_DUD0_VALID00) 405 panic("%s: dud0 byte 0 valid", __func__); 406 if (dud & TCDS_DUD0_VALID01) 407 dudmask |= TCDS_DUD_BYTE01; 408 if (dud & TCDS_DUD0_VALID10) 409 dudmask |= TCDS_DUD_BYTE10; 410 #ifdef DIAGNOSTIC 411 if (dud & TCDS_DUD0_VALID11) 412 dudmask |= TCDS_DUD_BYTE11; 413 #endif 414 NCR_DMA(("dud0 at %p dudmask 0x%x\n", 415 addr, dudmask)); 416 *addr = (*addr & ~dudmask) | (dud & dudmask); 417 } 418 dud = bus_space_read_4(tcds->sc_bst, 419 tcds->sc_bsh, tcds->sc_dud1); 420 if ((dud & TCDS_DUD1_VALIDBITS) != 0) { 421 pa = bus_space_read_4(tcds->sc_bst, tcds->sc_bsh, 422 tcds->sc_sda) << 2; 423 dudmask = 0; 424 if (dud & TCDS_DUD1_VALID00) 425 dudmask |= TCDS_DUD_BYTE00; 426 if (dud & TCDS_DUD1_VALID01) 427 dudmask |= TCDS_DUD_BYTE01; 428 if (dud & TCDS_DUD1_VALID10) 429 dudmask |= TCDS_DUD_BYTE10; 430 #ifdef DIAGNOSTIC 431 if (dud & TCDS_DUD1_VALID11) 432 panic("%s: dud1 byte 3 valid", __func__); 433 #endif 434 NCR_DMA(("dud1 at 0x%lx dudmask 0x%x\n", 435 pa, dudmask)); 436 /* XXX Fix TC_PHYS_TO_UNCACHED() */ 437 #if defined(__alpha__) 438 addr = (uint32_t *)ALPHA_PHYS_TO_K0SEG(pa); 439 #elif defined(__mips__) 440 addr = (uint32_t *)MIPS_PHYS_TO_KSEG1(pa); 441 #elif defined(__vax__) 442 addr = (uint32_t *)VAX_PHYS_TO_S0(pa); 443 #else 444 #error TURBOchannel only exists on DECs, folks... 445 #endif 446 *addr = (*addr & ~dudmask) | (dud & dudmask); 447 } 448 /* XXX deal with saved residual byte? */ 449 } 450 451 bus_dmamap_unload(asc->sc_dmat, asc->sc_dmamap); 452 asc->sc_flags &= ~ASC_MAPLOADED; 453 454 return 0; 455 } 456 457 /* 458 * Glue functions. 459 */ 460 static uint8_t 461 asc_read_reg(struct ncr53c9x_softc *sc, int reg) 462 { 463 struct asc_softc *asc = (struct asc_softc *)sc; 464 uint32_t v; 465 466 v = bus_space_read_4(asc->sc_bst, asc->sc_scsi_bsh, 467 reg * sizeof(uint32_t)); 468 469 return v & 0xff; 470 } 471 472 static void 473 asc_write_reg(struct ncr53c9x_softc *sc, int reg, u_char val) 474 { 475 struct asc_softc *asc = (struct asc_softc *)sc; 476 477 bus_space_write_4(asc->sc_bst, asc->sc_scsi_bsh, 478 reg * sizeof(uint32_t), val); 479 } 480 481 static int 482 tcds_dma_isintr(struct ncr53c9x_softc *sc) 483 { 484 struct asc_softc *asc = (struct asc_softc *)sc; 485 int x; 486 487 x = tcds_scsi_isintr(asc->sc_tcds, 1); 488 489 /* XXX */ 490 return x; 491 } 492 493 static int 494 tcds_dma_isactive(struct ncr53c9x_softc *sc) 495 { 496 struct asc_softc *asc = (struct asc_softc *)sc; 497 498 return (asc->sc_flags & ASC_DMAACTIVE) != 0; 499 } 500 501 static void 502 tcds_clear_latched_intr(struct ncr53c9x_softc *sc) 503 { 504 struct asc_softc *asc = (struct asc_softc *)sc; 505 506 /* Clear the TCDS interrupt bit. */ 507 (void)tcds_scsi_isintr(asc->sc_tcds, 1); 508 } 509
Indexes created Tue Sep 30 07:10:03 GMT 2025