1 /*- 2 * Copyright (c) 2021 Alstom Group. 3 * Copyright (c) 2021 Semihalf. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 #include "opt_platform.h" 28 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/bio.h> 32 #include <sys/endian.h> 33 #include <sys/kernel.h> 34 #include <sys/kthread.h> 35 #include <sys/lock.h> 36 #include <sys/malloc.h> 37 #include <sys/module.h> 38 #include <sys/mutex.h> 39 #include <sys/rman.h> 40 41 #include <geom/geom_disk.h> 42 43 #include <machine/bus.h> 44 45 #include <dev/clk/clk.h> 46 #include <dev/fdt/fdt_common.h> 47 #include <dev/ofw/ofw_bus_subr.h> 48 49 #include <vm/pmap.h> 50 51 #include "flex_spi.h" 52 53 static MALLOC_DEFINE(SECTOR_BUFFER, "flex_spi", "FSL QSPI sector buffer memory"); 54 55 #define AHB_LUT_ID 31 56 #define MHZ(x) ((x)*1000*1000) 57 #define SPI_DEFAULT_CLK_RATE (MHZ(10)) 58 59 static int driver_flags = 0; 60 SYSCTL_NODE(_hw, OID_AUTO, flex_spi, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 61 "FlexSPI driver parameters"); 62 SYSCTL_INT(_hw_flex_spi, OID_AUTO, driver_flags, CTLFLAG_RDTUN, &driver_flags, 0, 63 "Configuration flags and quirks"); 64 65 static struct ofw_compat_data flex_spi_compat_data[] = { 66 {"nxp,lx2160a-fspi", true}, 67 {NULL, false} 68 }; 69 70 struct flex_spi_flash_info { 71 char* name; 72 uint32_t jedecid; 73 uint32_t sectorsize; 74 uint32_t sectorcount; 75 uint32_t erasesize; 76 uint32_t maxclk; 77 }; 78 79 /* Add information about supported Flashes. TODO: use SFDP instead */ 80 static struct flex_spi_flash_info flex_spi_flash_info[] = { 81 {"W25Q128JW", 0x001860ef, 64*1024, 256, 4096, MHZ(100)}, 82 {NULL, 0, 0, 0, 0, 0} 83 }; 84 85 struct flex_spi_softc 86 { 87 device_t dev; 88 unsigned int flags; 89 90 struct bio_queue_head bio_queue; 91 struct mtx disk_mtx; 92 struct disk *disk; 93 struct proc *p; 94 unsigned int taskstate; 95 uint8_t *buf; 96 97 struct resource *ahb_mem_res; 98 struct resource *mem_res; 99 100 clk_t fspi_clk_en; 101 clk_t fspi_clk; 102 uint64_t fspi_clk_en_hz; 103 uint64_t fspi_clk_hz; 104 105 /* TODO: support more than one Flash per bus */ 106 uint64_t fspi_max_clk; 107 uint32_t quirks; 108 109 /* Flash parameters */ 110 uint32_t sectorsize; 111 uint32_t sectorcount; 112 uint32_t erasesize; 113 }; 114 115 static int flex_spi_read(struct flex_spi_softc *sc, off_t offset, caddr_t data, 116 size_t count); 117 static int flex_spi_write(struct flex_spi_softc *sc, off_t offset, 118 uint8_t *data, size_t size); 119 120 static int flex_spi_attach(device_t dev); 121 static int flex_spi_probe(device_t dev); 122 static int flex_spi_detach(device_t dev); 123 124 /* disk routines */ 125 static int flex_spi_open(struct disk *dp); 126 static int flex_spi_close(struct disk *dp); 127 static int flex_spi_ioctl(struct disk *, u_long, void *, int, struct thread *); 128 static void flex_spi_strategy(struct bio *bp); 129 static int flex_spi_getattr(struct bio *bp); 130 static void flex_spi_task(void *arg); 131 132 static uint32_t 133 read_reg(struct flex_spi_softc *sc, uint32_t offset) 134 { 135 136 return ((bus_read_4(sc->mem_res, offset))); 137 } 138 139 static void 140 write_reg(struct flex_spi_softc *sc, uint32_t offset, uint32_t value) 141 { 142 143 bus_write_4(sc->mem_res, offset, (value)); 144 } 145 146 static int 147 reg_read_poll_tout(struct flex_spi_softc *sc, uint32_t offset, uint32_t mask, 148 uint32_t delay_us, uint32_t iterations, bool positive) 149 { 150 uint32_t reg; 151 uint32_t condition = 0; 152 153 do { 154 reg = read_reg(sc, offset); 155 if (positive) 156 condition = ((reg & mask) == 0); 157 else 158 condition = ((reg & mask) != 0); 159 160 if (condition == 0) 161 break; 162 163 DELAY(delay_us); 164 } while (condition && (--iterations > 0)); 165 166 return (condition != 0); 167 } 168 169 static int 170 flex_spi_clk_setup(struct flex_spi_softc *sc, uint32_t rate) 171 { 172 int ret = 0; 173 174 /* disable to avoid glitching */ 175 ret |= clk_disable(sc->fspi_clk_en); 176 ret |= clk_disable(sc->fspi_clk); 177 178 ret |= clk_set_freq(sc->fspi_clk, rate, 0); 179 sc->fspi_clk_hz = rate; 180 181 /* enable clocks back */ 182 ret |= clk_enable(sc->fspi_clk_en); 183 ret |= clk_enable(sc->fspi_clk); 184 185 if (ret) 186 return (EINVAL); 187 188 return (0); 189 } 190 191 static void 192 flex_spi_prepare_lut(struct flex_spi_softc *sc, uint8_t op) 193 { 194 uint32_t lut_id; 195 uint32_t lut; 196 197 /* unlock LUT */ 198 write_reg(sc, FSPI_LUTKEY, FSPI_LUTKEY_VALUE); 199 write_reg(sc, FSPI_LCKCR, FSPI_LCKER_UNLOCK); 200 201 /* Read JEDEC ID */ 202 lut_id = 0; 203 204 switch (op) { 205 case LUT_FLASH_CMD_JEDECID: 206 lut = LUT_DEF(0, LUT_CMD, LUT_PAD(1), FSPI_CMD_READ_IDENT); 207 lut |= LUT_DEF(1, LUT_NXP_READ, LUT_PAD(1), 0); 208 write_reg(sc, FSPI_LUT_REG(lut_id), lut); 209 write_reg(sc, FSPI_LUT_REG(lut_id) + 4, 0); 210 break; 211 case LUT_FLASH_CMD_READ: 212 lut = LUT_DEF(0, LUT_CMD, LUT_PAD(1), FSPI_CMD_FAST_READ); 213 lut |= LUT_DEF(1, LUT_ADDR, LUT_PAD(1), 3*8); 214 write_reg(sc, FSPI_LUT_REG(lut_id), lut); 215 lut = LUT_DEF(0, LUT_DUMMY, LUT_PAD(1), 1*8); 216 lut |= LUT_DEF(1, LUT_NXP_READ, LUT_PAD(1), 0); 217 write_reg(sc, FSPI_LUT_REG(lut_id) + 4, lut); 218 write_reg(sc, FSPI_LUT_REG(lut_id) + 8, 0); 219 break; 220 case LUT_FLASH_CMD_STATUS_READ: 221 lut = LUT_DEF(0, LUT_CMD, LUT_PAD(1), FSPI_CMD_READ_STATUS); 222 lut |= LUT_DEF(1, LUT_NXP_READ, LUT_PAD(1), 0); 223 write_reg(sc, FSPI_LUT_REG(lut_id), lut); 224 write_reg(sc, FSPI_LUT_REG(lut_id) + 4, 0); 225 break; 226 case LUT_FLASH_CMD_PAGE_PROGRAM: 227 lut = LUT_DEF(0, LUT_CMD, LUT_PAD(1), FSPI_CMD_PAGE_PROGRAM); 228 lut |= LUT_DEF(1, LUT_ADDR, LUT_PAD(1), 3*8); 229 write_reg(sc, FSPI_LUT_REG(lut_id), lut); 230 lut = LUT_DEF(0, LUT_NXP_WRITE, LUT_PAD(1), 0); 231 write_reg(sc, FSPI_LUT_REG(lut_id) + 4, lut); 232 write_reg(sc, FSPI_LUT_REG(lut_id) + 8, 0); 233 break; 234 case LUT_FLASH_CMD_WRITE_ENABLE: 235 lut = LUT_DEF(0, LUT_CMD, LUT_PAD(1), FSPI_CMD_WRITE_ENABLE); 236 write_reg(sc, FSPI_LUT_REG(lut_id), lut); 237 write_reg(sc, FSPI_LUT_REG(lut_id) + 4, 0); 238 break; 239 case LUT_FLASH_CMD_WRITE_DISABLE: 240 lut = LUT_DEF(0, LUT_CMD, LUT_PAD(1), FSPI_CMD_WRITE_DISABLE); 241 write_reg(sc, FSPI_LUT_REG(lut_id), lut); 242 write_reg(sc, FSPI_LUT_REG(lut_id) + 4, 0); 243 break; 244 case LUT_FLASH_CMD_SECTOR_ERASE: 245 lut = LUT_DEF(0, LUT_CMD, LUT_PAD(1), FSPI_CMD_SECTOR_ERASE); 246 lut |= LUT_DEF(1, LUT_ADDR, LUT_PAD(1), 3*8); 247 write_reg(sc, FSPI_LUT_REG(lut_id), lut); 248 write_reg(sc, FSPI_LUT_REG(lut_id) + 4, 0); 249 break; 250 default: 251 write_reg(sc, FSPI_LUT_REG(lut_id), 0); 252 } 253 254 /* lock LUT */ 255 write_reg(sc, FSPI_LUTKEY, FSPI_LUTKEY_VALUE); 256 write_reg(sc, FSPI_LCKCR, FSPI_LCKER_LOCK); 257 } 258 259 static void 260 flex_spi_prepare_ahb_lut(struct flex_spi_softc *sc) 261 { 262 uint32_t lut_id; 263 uint32_t lut; 264 265 /* unlock LUT */ 266 write_reg(sc, FSPI_LUTKEY, FSPI_LUTKEY_VALUE); 267 write_reg(sc, FSPI_LCKCR, FSPI_LCKER_UNLOCK); 268 269 lut_id = AHB_LUT_ID; 270 lut = LUT_DEF(0, LUT_CMD, LUT_PAD(1), FSPI_CMD_FAST_READ); 271 lut |= LUT_DEF(1, LUT_ADDR, LUT_PAD(1), 3*8); 272 write_reg(sc, FSPI_LUT_REG(lut_id), lut); 273 lut = LUT_DEF(0, LUT_DUMMY, LUT_PAD(1), 1*8); 274 lut |= LUT_DEF(1, LUT_NXP_READ, LUT_PAD(1), 0); 275 write_reg(sc, FSPI_LUT_REG(lut_id) + 4, lut); 276 write_reg(sc, FSPI_LUT_REG(lut_id) + 8, 0); 277 278 /* lock LUT */ 279 write_reg(sc, FSPI_LUTKEY, FSPI_LUTKEY_VALUE); 280 write_reg(sc, FSPI_LCKCR, FSPI_LCKER_LOCK); 281 } 282 283 #define DIR_READ 0 284 #define DIR_WRITE 1 285 286 static void 287 flex_spi_read_rxfifo(struct flex_spi_softc *sc, uint8_t *buf, uint8_t size) 288 { 289 int i, ret, reg; 290 291 /* 292 * Default value of water mark level is 8 bytes, hence in single 293 * read request controller can read max 8 bytes of data. 294 */ 295 for (i = 0; i < size; i += 4) { 296 /* Wait for RXFIFO available */ 297 if (i % 8 == 0) { 298 ret = reg_read_poll_tout(sc, FSPI_INTR, FSPI_INTR_IPRXWA, 299 1, 50000, 1); 300 if (ret) 301 device_printf(sc->dev, 302 "timed out waiting for FSPI_INTR_IPRXWA\n"); 303 } 304 305 if (i % 8 == 0) 306 reg = read_reg(sc, FSPI_RFDR); 307 else 308 reg = read_reg(sc, FSPI_RFDR + 4); 309 310 if (size >= (i + 4)) 311 *(uint32_t *)(buf + i) = reg; 312 else 313 memcpy(buf + i, ®, size - i); 314 315 /* move the FIFO pointer */ 316 if (i % 8 != 0) 317 write_reg(sc, FSPI_INTR, FSPI_INTR_IPRXWA); 318 } 319 320 /* invalid the RXFIFO */ 321 write_reg(sc, FSPI_IPRXFCR, FSPI_IPRXFCR_CLR); 322 /* move the FIFO pointer */ 323 write_reg(sc, FSPI_INTR, FSPI_INTR_IPRXWA); 324 } 325 326 static void 327 flex_spi_write_txfifo(struct flex_spi_softc *sc, uint8_t *buf, uint8_t size) 328 { 329 int i, ret, reg; 330 331 /* invalid the TXFIFO */ 332 write_reg(sc, FSPI_IPRXFCR, FSPI_IPTXFCR_CLR); 333 334 /* 335 * Default value of water mark level is 8 bytes, hence in single 336 * read request controller can read max 8 bytes of data. 337 */ 338 for (i = 0; i < size; i += 4) { 339 /* Wait for RXFIFO available */ 340 if (i % 8 == 0) { 341 ret = reg_read_poll_tout(sc, FSPI_INTR, FSPI_INTR_IPTXWE, 342 1, 50000, 1); 343 if (ret) 344 device_printf(sc->dev, 345 "timed out waiting for FSPI_INTR_IPRXWA\n"); 346 } 347 348 if (size >= (i + 4)) 349 reg = *(uint32_t *)(buf + i); 350 else { 351 reg = 0; 352 memcpy(®, buf + i, size - i); 353 } 354 355 if (i % 8 == 0) 356 write_reg(sc, FSPI_TFDR, reg); 357 else 358 write_reg(sc, FSPI_TFDR + 4, reg); 359 360 /* move the FIFO pointer */ 361 if (i % 8 != 0) 362 write_reg(sc, FSPI_INTR, FSPI_INTR_IPTXWE); 363 } 364 365 /* move the FIFO pointer */ 366 write_reg(sc, FSPI_INTR, FSPI_INTR_IPTXWE); 367 } 368 369 static int 370 flex_spi_do_op(struct flex_spi_softc *sc, uint32_t op, uint32_t addr, 371 uint8_t *buf, uint8_t size, uint8_t dir) 372 { 373 374 uint32_t cnt = 1000, reg; 375 376 reg = read_reg(sc, FSPI_IPRXFCR); 377 /* invalidate RXFIFO first */ 378 reg &= ~FSPI_IPRXFCR_DMA_EN; 379 reg |= FSPI_IPRXFCR_CLR; 380 write_reg(sc, FSPI_IPRXFCR, reg); 381 382 /* Prepare LUT */ 383 flex_spi_prepare_lut(sc, op); 384 385 write_reg(sc, FSPI_IPCR0, addr); 386 /* 387 * Always start the sequence at the same index since we update 388 * the LUT at each BIO operation. And also specify the DATA 389 * length, since it's has not been specified in the LUT. 390 */ 391 write_reg(sc, FSPI_IPCR1, size | 392 (0 << FSPI_IPCR1_SEQID_SHIFT) | (0 << FSPI_IPCR1_SEQNUM_SHIFT)); 393 394 if ((size != 0) && (dir == DIR_WRITE)) 395 flex_spi_write_txfifo(sc, buf, size); 396 397 /* Trigger the LUT now. */ 398 write_reg(sc, FSPI_IPCMD, FSPI_IPCMD_TRG); 399 400 401 /* Wait for completion. */ 402 do { 403 reg = read_reg(sc, FSPI_INTR); 404 if (reg & FSPI_INTR_IPCMDDONE) { 405 write_reg(sc, FSPI_INTR, FSPI_INTR_IPCMDDONE); 406 break; 407 } 408 DELAY(1); 409 } while (--cnt); 410 if (cnt == 0) { 411 device_printf(sc->dev, "timed out waiting for command completion\n"); 412 return (ETIMEDOUT); 413 } 414 415 /* Invoke IP data read, if request is of data read. */ 416 if ((size != 0) && (dir == DIR_READ)) 417 flex_spi_read_rxfifo(sc, buf, size); 418 419 return (0); 420 } 421 422 static int 423 flex_spi_wait_for_controller(struct flex_spi_softc *sc) 424 { 425 int err; 426 427 /* Wait for controller being ready. */ 428 err = reg_read_poll_tout(sc, FSPI_STS0, 429 FSPI_STS0_ARB_IDLE, 1, POLL_TOUT, 1); 430 431 return (err); 432 } 433 434 static int 435 flex_spi_wait_for_flash(struct flex_spi_softc *sc) 436 { 437 int ret; 438 uint32_t status = 0; 439 440 ret = flex_spi_wait_for_controller(sc); 441 if (ret != 0) { 442 device_printf(sc->dev, "%s: timed out waiting for controller", __func__); 443 return (ret); 444 } 445 446 do { 447 ret = flex_spi_do_op(sc, LUT_FLASH_CMD_STATUS_READ, 0, (void*)&status, 448 1, DIR_READ); 449 if (ret != 0) { 450 device_printf(sc->dev, "ERROR: failed to get flash status\n"); 451 return (ret); 452 } 453 454 } while (status & STATUS_WIP); 455 456 return (0); 457 } 458 459 static int 460 flex_spi_identify(struct flex_spi_softc *sc) 461 { 462 int ret; 463 uint32_t id = 0; 464 struct flex_spi_flash_info *finfo = flex_spi_flash_info; 465 466 ret = flex_spi_do_op(sc, LUT_FLASH_CMD_JEDECID, 0, (void*)&id, sizeof(id), DIR_READ); 467 if (ret != 0) { 468 device_printf(sc->dev, "ERROR: failed to identify device\n"); 469 return (ret); 470 } 471 472 /* XXX TODO: SFDP to be implemented */ 473 while (finfo->jedecid != 0) { 474 if (id == finfo->jedecid) { 475 device_printf(sc->dev, "found %s Flash\n", finfo->name); 476 sc->sectorsize = finfo->sectorsize; 477 sc->sectorcount = finfo->sectorcount; 478 sc->erasesize = finfo->erasesize; 479 sc->fspi_max_clk = finfo->maxclk; 480 return (0); 481 } 482 finfo++; 483 } 484 485 return (EINVAL); 486 } 487 488 static inline int 489 flex_spi_force_ip_mode(struct flex_spi_softc *sc) 490 { 491 492 if (sc->quirks & FSPI_QUIRK_USE_IP_ONLY) 493 return (1); 494 if (driver_flags & FSPI_QUIRK_USE_IP_ONLY) 495 return (1); 496 497 return (0); 498 } 499 500 static int 501 flex_spi_read(struct flex_spi_softc *sc, off_t offset, caddr_t data, 502 size_t count) 503 { 504 int err; 505 size_t len; 506 507 /* Wait for controller being ready. */ 508 err = flex_spi_wait_for_controller(sc); 509 if (err) 510 device_printf(sc->dev, 511 "warning: spi_read, timed out waiting for controller"); 512 513 /* Use AHB access whenever we can */ 514 if (flex_spi_force_ip_mode(sc) != 0) { 515 do { 516 if (((offset % 4) != 0) || (count < 4)) { 517 *(uint8_t*)data = bus_read_1(sc->ahb_mem_res, offset); 518 data++; 519 count--; 520 offset++; 521 } else { 522 *(uint32_t*)data = bus_read_4(sc->ahb_mem_res, offset); 523 data += 4; 524 count -= 4; 525 offset += 4; 526 } 527 } while (count); 528 529 return (0); 530 } 531 532 do { 533 len = min(64, count); 534 err = flex_spi_do_op(sc, LUT_FLASH_CMD_READ, offset, (void*)data, 535 len, DIR_READ); 536 if (err) 537 return (err); 538 offset += len; 539 data += len; 540 count -= len; 541 } while (count); 542 543 return (0); 544 } 545 546 static int 547 flex_spi_write(struct flex_spi_softc *sc, off_t offset, uint8_t *data, 548 size_t size) 549 { 550 int ret = 0; 551 size_t ptr; 552 553 flex_spi_wait_for_flash(sc); 554 ret = flex_spi_do_op(sc, LUT_FLASH_CMD_WRITE_ENABLE, offset, NULL, 555 0, DIR_READ); 556 if (ret != 0) { 557 device_printf(sc->dev, "ERROR: failed to enable writes\n"); 558 return (ret); 559 } 560 flex_spi_wait_for_flash(sc); 561 562 /* per-sector write */ 563 while (size > 0) { 564 uint32_t sector_base = rounddown2(offset, sc->erasesize); 565 size_t size_in_sector = size; 566 567 if (size_in_sector + offset > sector_base + sc->erasesize) 568 size_in_sector = sector_base + sc->erasesize - offset; 569 570 /* Read sector */ 571 ret = flex_spi_read(sc, sector_base, sc->buf, sc->erasesize); 572 if (ret != 0) { 573 device_printf(sc->dev, "ERROR: failed to read sector %d\n", 574 sector_base); 575 goto exit; 576 } 577 578 /* Erase sector */ 579 flex_spi_wait_for_flash(sc); 580 ret = flex_spi_do_op(sc, LUT_FLASH_CMD_SECTOR_ERASE, offset, NULL, 581 0, DIR_READ); 582 if (ret != 0) { 583 device_printf(sc->dev, "ERROR: failed to erase sector %d\n", 584 sector_base); 585 goto exit; 586 } 587 588 /* Update buffer with input data */ 589 memcpy(sc->buf + (offset - sector_base), data, size_in_sector); 590 591 /* Write buffer back to the flash 592 * Up to 32 bytes per single request, request cannot spread 593 * across 256-byte page boundary 594 */ 595 for (ptr = 0; ptr < sc->erasesize; ptr += 32) { 596 flex_spi_wait_for_flash(sc); 597 ret = flex_spi_do_op(sc, LUT_FLASH_CMD_PAGE_PROGRAM, 598 sector_base + ptr, (void*)(sc->buf + ptr), 32, DIR_WRITE); 599 if (ret != 0) { 600 device_printf(sc->dev, "ERROR: failed to write address %ld\n", 601 sector_base + ptr); 602 goto exit; 603 } 604 } 605 606 /* update pointers */ 607 size = size - size_in_sector; 608 offset = offset + size; 609 } 610 611 flex_spi_wait_for_flash(sc); 612 ret = flex_spi_do_op(sc, LUT_FLASH_CMD_WRITE_DISABLE, offset, (void*)sc->buf, 613 0, DIR_READ); 614 if (ret != 0) { 615 device_printf(sc->dev, "ERROR: failed to disable writes\n"); 616 goto exit; 617 } 618 flex_spi_wait_for_flash(sc); 619 620 exit: 621 622 return (ret); 623 } 624 625 static int 626 flex_spi_default_setup(struct flex_spi_softc *sc) 627 { 628 int ret, i; 629 uint32_t reg; 630 631 /* Default clock speed */ 632 ret = flex_spi_clk_setup(sc, SPI_DEFAULT_CLK_RATE); 633 if (ret) 634 return (ret); 635 636 /* Reset the module */ 637 /* w1c register, wait unit clear */ 638 reg = read_reg(sc, FSPI_MCR0); 639 reg |= FSPI_MCR0_SWRST; 640 write_reg(sc, FSPI_MCR0, reg); 641 ret = reg_read_poll_tout(sc, FSPI_MCR0, FSPI_MCR0_SWRST, 1000, POLL_TOUT, 0); 642 if (ret != 0) { 643 device_printf(sc->dev, "time out waiting for reset"); 644 return (ret); 645 } 646 647 /* Disable the module */ 648 write_reg(sc, FSPI_MCR0, FSPI_MCR0_MDIS); 649 650 /* Reset the DLL register to default value */ 651 write_reg(sc, FSPI_DLLACR, FSPI_DLLACR_OVRDEN); 652 write_reg(sc, FSPI_DLLBCR, FSPI_DLLBCR_OVRDEN); 653 654 /* enable module */ 655 write_reg(sc, FSPI_MCR0, FSPI_MCR0_AHB_TIMEOUT(0xFF) | 656 FSPI_MCR0_IP_TIMEOUT(0xFF) | (uint32_t) FSPI_MCR0_OCTCOMB_EN); 657 658 /* 659 * Disable same device enable bit and configure all slave devices 660 * independently. 661 */ 662 reg = read_reg(sc, FSPI_MCR2); 663 reg = reg & ~(FSPI_MCR2_SAMEDEVICEEN); 664 write_reg(sc, FSPI_MCR2, reg); 665 666 /* AHB configuration for access buffer 0~7. */ 667 for (i = 0; i < 7; i++) 668 write_reg(sc, FSPI_AHBRX_BUF0CR0 + 4 * i, 0); 669 670 /* 671 * Set ADATSZ with the maximum AHB buffer size to improve the read 672 * performance. 673 */ 674 write_reg(sc, FSPI_AHBRX_BUF7CR0, (2048 / 8 | 675 FSPI_AHBRXBUF0CR7_PREF)); 676 677 /* prefetch and no start address alignment limitation */ 678 write_reg(sc, FSPI_AHBCR, FSPI_AHBCR_PREF_EN | FSPI_AHBCR_RDADDROPT); 679 680 /* AHB Read - Set lut sequence ID for all CS. */ 681 flex_spi_prepare_ahb_lut(sc); 682 write_reg(sc, FSPI_FLSHA1CR2, AHB_LUT_ID); 683 write_reg(sc, FSPI_FLSHA2CR2, AHB_LUT_ID); 684 write_reg(sc, FSPI_FLSHB1CR2, AHB_LUT_ID); 685 write_reg(sc, FSPI_FLSHB2CR2, AHB_LUT_ID); 686 687 /* disable interrupts */ 688 write_reg(sc, FSPI_INTEN, 0); 689 690 return (0); 691 } 692 693 static int 694 flex_spi_probe(device_t dev) 695 { 696 697 if (!ofw_bus_status_okay(dev)) 698 return (ENXIO); 699 700 if (!ofw_bus_search_compatible(dev, flex_spi_compat_data)->ocd_data) 701 return (ENXIO); 702 703 device_set_desc(dev, "NXP FlexSPI Flash"); 704 return (BUS_PROBE_SPECIFIC); 705 } 706 707 static int 708 flex_spi_attach(device_t dev) 709 { 710 struct flex_spi_softc *sc; 711 phandle_t node; 712 int rid; 713 uint32_t reg; 714 715 node = ofw_bus_get_node(dev); 716 sc = device_get_softc(dev); 717 sc->dev = dev; 718 719 mtx_init(&sc->disk_mtx, "flex_spi_DISK", "QSPI disk mtx", MTX_DEF); 720 721 /* Get memory resources. */ 722 rid = 0; 723 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 724 RF_ACTIVE); 725 726 rid = 1; 727 sc->ahb_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 728 RF_ACTIVE | RF_SHAREABLE); 729 730 if (sc->mem_res == NULL || sc->ahb_mem_res == NULL) { 731 device_printf(dev, "could not allocate resources\n"); 732 flex_spi_detach(dev); 733 return (ENOMEM); 734 } 735 736 /* Get clocks */ 737 if ((clk_get_by_ofw_name(dev, node, "fspi_en", &sc->fspi_clk_en) != 0) 738 || (clk_get_freq(sc->fspi_clk_en, &sc->fspi_clk_en_hz) != 0)) { 739 device_printf(dev, "could not get fspi_en clock\n"); 740 flex_spi_detach(dev); 741 return (EINVAL); 742 } 743 if ((clk_get_by_ofw_name(dev, node, "fspi", &sc->fspi_clk) != 0) 744 || (clk_get_freq(sc->fspi_clk, &sc->fspi_clk_hz) != 0)) { 745 device_printf(dev, "could not get fspi clock\n"); 746 flex_spi_detach(dev); 747 return (EINVAL); 748 } 749 750 /* Enable clocks */ 751 if (clk_enable(sc->fspi_clk_en) != 0 || 752 clk_enable(sc->fspi_clk) != 0) { 753 device_printf(dev, "could not enable clocks\n"); 754 flex_spi_detach(dev); 755 return (EINVAL); 756 } 757 758 /* Clear potential interrupts */ 759 reg = read_reg(sc, FSPI_INTR); 760 if (reg) 761 write_reg(sc, FSPI_INTR, reg); 762 763 /* Default setup */ 764 if (flex_spi_default_setup(sc) != 0) { 765 device_printf(sc->dev, "Unable to initialize defaults\n"); 766 flex_spi_detach(dev); 767 return (ENXIO); 768 } 769 770 /* Identify attached Flash */ 771 if(flex_spi_identify(sc) != 0) { 772 device_printf(sc->dev, "Unable to identify Flash\n"); 773 flex_spi_detach(dev); 774 return (ENXIO); 775 } 776 777 if (flex_spi_clk_setup(sc, sc->fspi_max_clk) != 0) { 778 device_printf(sc->dev, "Unable to set up SPI max clock\n"); 779 flex_spi_detach(dev); 780 return (ENXIO); 781 } 782 783 sc->buf = malloc(sc->erasesize, SECTOR_BUFFER, M_WAITOK); 784 if (sc->buf == NULL) { 785 device_printf(sc->dev, "Unable to set up allocate internal buffer\n"); 786 flex_spi_detach(dev); 787 return (ENOMEM); 788 } 789 790 /* Move it to per-flash */ 791 sc->disk = disk_alloc(); 792 sc->disk->d_open = flex_spi_open; 793 sc->disk->d_close = flex_spi_close; 794 sc->disk->d_strategy = flex_spi_strategy; 795 sc->disk->d_getattr = flex_spi_getattr; 796 sc->disk->d_ioctl = flex_spi_ioctl; 797 sc->disk->d_name = "flash/qspi"; 798 sc->disk->d_drv1 = sc; 799 /* the most that can fit in a single spi transaction */ 800 sc->disk->d_maxsize = DFLTPHYS; 801 sc->disk->d_sectorsize = FLASH_SECTORSIZE; 802 sc->disk->d_unit = device_get_unit(sc->dev); 803 sc->disk->d_dump = NULL; 804 805 sc->disk->d_mediasize = sc->sectorsize * sc->sectorcount; 806 sc->disk->d_stripesize = sc->erasesize; 807 808 bioq_init(&sc->bio_queue); 809 sc->taskstate = TSTATE_RUNNING; 810 kproc_create(&flex_spi_task, sc, &sc->p, 0, 0, "task: qspi flash"); 811 disk_create(sc->disk, DISK_VERSION); 812 813 return (0); 814 } 815 816 static int 817 flex_spi_detach(device_t dev) 818 { 819 struct flex_spi_softc *sc; 820 int err; 821 822 sc = device_get_softc(dev); 823 err = 0; 824 825 if (!device_is_attached(dev)) 826 goto free_resources; 827 828 mtx_lock(&sc->disk_mtx); 829 if (sc->taskstate == TSTATE_RUNNING) { 830 sc->taskstate = TSTATE_STOPPING; 831 wakeup(sc->disk); 832 while (err == 0 && sc->taskstate != TSTATE_STOPPED) { 833 err = mtx_sleep(sc->disk, &sc->disk_mtx, 0, "flex_spi", 834 hz * 3); 835 if (err != 0) { 836 sc->taskstate = TSTATE_RUNNING; 837 device_printf(sc->dev, 838 "Failed to stop queue task\n"); 839 } 840 } 841 } 842 843 mtx_unlock(&sc->disk_mtx); 844 mtx_destroy(&sc->disk_mtx); 845 846 if (err == 0 && sc->taskstate == TSTATE_STOPPED) { 847 disk_destroy(sc->disk); 848 bioq_flush(&sc->bio_queue, NULL, ENXIO); 849 } 850 851 /* Disable hardware. */ 852 free_resources: 853 /* Release memory resource. */ 854 if (sc->mem_res != NULL) 855 bus_release_resource(dev, SYS_RES_MEMORY, 856 rman_get_rid(sc->mem_res), sc->mem_res); 857 858 if (sc->ahb_mem_res != NULL) 859 bus_release_resource(dev, SYS_RES_MEMORY, 860 rman_get_rid(sc->ahb_mem_res), sc->ahb_mem_res); 861 862 /* Disable clocks */ 863 if (sc->fspi_clk_en_hz) 864 clk_disable(sc->fspi_clk_en); 865 if (sc->fspi_clk_hz) 866 clk_disable(sc->fspi_clk); 867 868 free(sc->buf, SECTOR_BUFFER); 869 870 return (err); 871 } 872 873 static int 874 flex_spi_open(struct disk *dp) 875 { 876 877 return (0); 878 } 879 880 static int 881 flex_spi_close(struct disk *dp) 882 { 883 884 return (0); 885 } 886 887 static int 888 flex_spi_ioctl(struct disk *dp, u_long cmd, void *data, int fflag, 889 struct thread *td) 890 { 891 892 return (ENOTSUP); 893 } 894 895 static void 896 flex_spi_strategy(struct bio *bp) 897 { 898 struct flex_spi_softc *sc; 899 900 sc = (struct flex_spi_softc *)bp->bio_disk->d_drv1; 901 mtx_lock(&sc->disk_mtx); 902 bioq_disksort(&sc->bio_queue, bp); 903 mtx_unlock(&sc->disk_mtx); 904 wakeup(sc->disk); 905 } 906 907 static int 908 flex_spi_getattr(struct bio *bp) 909 { 910 struct flex_spi_softc *sc; 911 device_t dev; 912 913 if (bp->bio_disk == NULL || bp->bio_disk->d_drv1 == NULL) { 914 return (ENXIO); 915 } 916 917 sc = bp->bio_disk->d_drv1; 918 dev = sc->dev; 919 920 if (strcmp(bp->bio_attribute, "SPI::device") != 0) { 921 return (-1); 922 } 923 924 if (bp->bio_length != sizeof(dev)) { 925 return (EFAULT); 926 } 927 928 bcopy(&dev, bp->bio_data, sizeof(dev)); 929 930 return (0); 931 } 932 933 static void 934 flex_spi_task(void *arg) 935 { 936 struct flex_spi_softc *sc; 937 struct bio *bp; 938 939 sc = (struct flex_spi_softc *)arg; 940 for (;;) { 941 mtx_lock(&sc->disk_mtx); 942 do { 943 if (sc->taskstate == TSTATE_STOPPING) { 944 sc->taskstate = TSTATE_STOPPED; 945 mtx_unlock(&sc->disk_mtx); 946 wakeup(sc->disk); 947 kproc_exit(0); 948 } 949 bp = bioq_first(&sc->bio_queue); 950 if (bp == NULL) 951 mtx_sleep(sc->disk, &sc->disk_mtx, PRIBIO, 952 "flex_spi", 0); 953 } while (bp == NULL); 954 bioq_remove(&sc->bio_queue, bp); 955 mtx_unlock(&sc->disk_mtx); 956 957 switch (bp->bio_cmd) { 958 case BIO_READ: 959 bp->bio_error = flex_spi_read(sc, bp->bio_offset, 960 bp->bio_data, bp->bio_bcount); 961 break; 962 case BIO_WRITE: 963 bp->bio_error = flex_spi_write(sc, bp->bio_offset, 964 bp->bio_data, bp->bio_bcount); 965 break; 966 default: 967 bp->bio_error = EINVAL; 968 } 969 biodone(bp); 970 } 971 } 972 973 static device_method_t flex_spi_methods[] = { 974 /* Device interface */ 975 DEVMETHOD(device_probe, flex_spi_probe), 976 DEVMETHOD(device_attach, flex_spi_attach), 977 DEVMETHOD(device_detach, flex_spi_detach), 978 979 { 0, 0 } 980 }; 981 982 static driver_t flex_spi_driver = { 983 "flex_spi", 984 flex_spi_methods, 985 sizeof(struct flex_spi_softc), 986 }; 987 988 DRIVER_MODULE(flex_spi, simplebus, flex_spi_driver, 0, 0); 989 SIMPLEBUS_PNP_INFO(flex_spi_compat_data); 990