1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright 2004-2008 Freescale Semiconductor, Inc. 4 * Copyright 2009 Semihalf. 5 * 6 * Approved as OSADL project by a majority of OSADL members and funded 7 * by OSADL membership fees in 2009; for details see www.osadl.org. 8 * 9 * Based on original driver from Freescale Semiconductor 10 * written by John Rigby <jrigby@freescale.com> on basis of mxc_nand.c. 11 * Reworked and extended by Piotr Ziecik <kosmo@semihalf.com>. 12 */ 13 14 #include <linux/module.h> 15 #include <linux/clk.h> 16 #include <linux/gfp.h> 17 #include <linux/delay.h> 18 #include <linux/err.h> 19 #include <linux/interrupt.h> 20 #include <linux/io.h> 21 #include <linux/mtd/mtd.h> 22 #include <linux/mtd/rawnand.h> 23 #include <linux/mtd/partitions.h> 24 #include <linux/of_address.h> 25 #include <linux/of_device.h> 26 #include <linux/of_irq.h> 27 #include <linux/of_platform.h> 28 29 #include <asm/mpc5121.h> 30 31 /* Addresses for NFC MAIN RAM BUFFER areas */ 32 #define NFC_MAIN_AREA(n) ((n) * 0x200) 33 34 /* Addresses for NFC SPARE BUFFER areas */ 35 #define NFC_SPARE_BUFFERS 8 36 #define NFC_SPARE_LEN 0x40 37 #define NFC_SPARE_AREA(n) (0x1000 + ((n) * NFC_SPARE_LEN)) 38 39 /* MPC5121 NFC registers */ 40 #define NFC_BUF_ADDR 0x1E04 41 #define NFC_FLASH_ADDR 0x1E06 42 #define NFC_FLASH_CMD 0x1E08 43 #define NFC_CONFIG 0x1E0A 44 #define NFC_ECC_STATUS1 0x1E0C 45 #define NFC_ECC_STATUS2 0x1E0E 46 #define NFC_SPAS 0x1E10 47 #define NFC_WRPROT 0x1E12 48 #define NFC_NF_WRPRST 0x1E18 49 #define NFC_CONFIG1 0x1E1A 50 #define NFC_CONFIG2 0x1E1C 51 #define NFC_UNLOCKSTART_BLK0 0x1E20 52 #define NFC_UNLOCKEND_BLK0 0x1E22 53 #define NFC_UNLOCKSTART_BLK1 0x1E24 54 #define NFC_UNLOCKEND_BLK1 0x1E26 55 #define NFC_UNLOCKSTART_BLK2 0x1E28 56 #define NFC_UNLOCKEND_BLK2 0x1E2A 57 #define NFC_UNLOCKSTART_BLK3 0x1E2C 58 #define NFC_UNLOCKEND_BLK3 0x1E2E 59 60 /* Bit Definitions: NFC_BUF_ADDR */ 61 #define NFC_RBA_MASK (7 << 0) 62 #define NFC_ACTIVE_CS_SHIFT 5 63 #define NFC_ACTIVE_CS_MASK (3 << NFC_ACTIVE_CS_SHIFT) 64 65 /* Bit Definitions: NFC_CONFIG */ 66 #define NFC_BLS_UNLOCKED (1 << 1) 67 68 /* Bit Definitions: NFC_CONFIG1 */ 69 #define NFC_ECC_4BIT (1 << 0) 70 #define NFC_FULL_PAGE_DMA (1 << 1) 71 #define NFC_SPARE_ONLY (1 << 2) 72 #define NFC_ECC_ENABLE (1 << 3) 73 #define NFC_INT_MASK (1 << 4) 74 #define NFC_BIG_ENDIAN (1 << 5) 75 #define NFC_RESET (1 << 6) 76 #define NFC_CE (1 << 7) 77 #define NFC_ONE_CYCLE (1 << 8) 78 #define NFC_PPB_32 (0 << 9) 79 #define NFC_PPB_64 (1 << 9) 80 #define NFC_PPB_128 (2 << 9) 81 #define NFC_PPB_256 (3 << 9) 82 #define NFC_PPB_MASK (3 << 9) 83 #define NFC_FULL_PAGE_INT (1 << 11) 84 85 /* Bit Definitions: NFC_CONFIG2 */ 86 #define NFC_COMMAND (1 << 0) 87 #define NFC_ADDRESS (1 << 1) 88 #define NFC_INPUT (1 << 2) 89 #define NFC_OUTPUT (1 << 3) 90 #define NFC_ID (1 << 4) 91 #define NFC_STATUS (1 << 5) 92 #define NFC_CMD_FAIL (1 << 15) 93 #define NFC_INT (1 << 15) 94 95 /* Bit Definitions: NFC_WRPROT */ 96 #define NFC_WPC_LOCK_TIGHT (1 << 0) 97 #define NFC_WPC_LOCK (1 << 1) 98 #define NFC_WPC_UNLOCK (1 << 2) 99 100 #define DRV_NAME "mpc5121_nfc" 101 102 /* Timeouts */ 103 #define NFC_RESET_TIMEOUT 1000 /* 1 ms */ 104 #define NFC_TIMEOUT (HZ / 10) /* 1/10 s */ 105 106 struct mpc5121_nfc_prv { 107 struct nand_controller controller; 108 struct nand_chip chip; 109 int irq; 110 void __iomem *regs; 111 struct clk *clk; 112 wait_queue_head_t irq_waitq; 113 uint column; 114 int spareonly; 115 void __iomem *csreg; 116 struct device *dev; 117 }; 118 119 static void mpc5121_nfc_done(struct mtd_info *mtd); 120 121 /* Read NFC register */ 122 static inline u16 nfc_read(struct mtd_info *mtd, uint reg) 123 { 124 struct nand_chip *chip = mtd_to_nand(mtd); 125 struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip); 126 127 return in_be16(prv->regs + reg); 128 } 129 130 /* Write NFC register */ 131 static inline void nfc_write(struct mtd_info *mtd, uint reg, u16 val) 132 { 133 struct nand_chip *chip = mtd_to_nand(mtd); 134 struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip); 135 136 out_be16(prv->regs + reg, val); 137 } 138 139 /* Set bits in NFC register */ 140 static inline void nfc_set(struct mtd_info *mtd, uint reg, u16 bits) 141 { 142 nfc_write(mtd, reg, nfc_read(mtd, reg) | bits); 143 } 144 145 /* Clear bits in NFC register */ 146 static inline void nfc_clear(struct mtd_info *mtd, uint reg, u16 bits) 147 { 148 nfc_write(mtd, reg, nfc_read(mtd, reg) & ~bits); 149 } 150 151 /* Invoke address cycle */ 152 static inline void mpc5121_nfc_send_addr(struct mtd_info *mtd, u16 addr) 153 { 154 nfc_write(mtd, NFC_FLASH_ADDR, addr); 155 nfc_write(mtd, NFC_CONFIG2, NFC_ADDRESS); 156 mpc5121_nfc_done(mtd); 157 } 158 159 /* Invoke command cycle */ 160 static inline void mpc5121_nfc_send_cmd(struct mtd_info *mtd, u16 cmd) 161 { 162 nfc_write(mtd, NFC_FLASH_CMD, cmd); 163 nfc_write(mtd, NFC_CONFIG2, NFC_COMMAND); 164 mpc5121_nfc_done(mtd); 165 } 166 167 /* Send data from NFC buffers to NAND flash */ 168 static inline void mpc5121_nfc_send_prog_page(struct mtd_info *mtd) 169 { 170 nfc_clear(mtd, NFC_BUF_ADDR, NFC_RBA_MASK); 171 nfc_write(mtd, NFC_CONFIG2, NFC_INPUT); 172 mpc5121_nfc_done(mtd); 173 } 174 175 /* Receive data from NAND flash */ 176 static inline void mpc5121_nfc_send_read_page(struct mtd_info *mtd) 177 { 178 nfc_clear(mtd, NFC_BUF_ADDR, NFC_RBA_MASK); 179 nfc_write(mtd, NFC_CONFIG2, NFC_OUTPUT); 180 mpc5121_nfc_done(mtd); 181 } 182 183 /* Receive ID from NAND flash */ 184 static inline void mpc5121_nfc_send_read_id(struct mtd_info *mtd) 185 { 186 nfc_clear(mtd, NFC_BUF_ADDR, NFC_RBA_MASK); 187 nfc_write(mtd, NFC_CONFIG2, NFC_ID); 188 mpc5121_nfc_done(mtd); 189 } 190 191 /* Receive status from NAND flash */ 192 static inline void mpc5121_nfc_send_read_status(struct mtd_info *mtd) 193 { 194 nfc_clear(mtd, NFC_BUF_ADDR, NFC_RBA_MASK); 195 nfc_write(mtd, NFC_CONFIG2, NFC_STATUS); 196 mpc5121_nfc_done(mtd); 197 } 198 199 /* NFC interrupt handler */ 200 static irqreturn_t mpc5121_nfc_irq(int irq, void *data) 201 { 202 struct mtd_info *mtd = data; 203 struct nand_chip *chip = mtd_to_nand(mtd); 204 struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip); 205 206 nfc_set(mtd, NFC_CONFIG1, NFC_INT_MASK); 207 wake_up(&prv->irq_waitq); 208 209 return IRQ_HANDLED; 210 } 211 212 /* Wait for operation complete */ 213 static void mpc5121_nfc_done(struct mtd_info *mtd) 214 { 215 struct nand_chip *chip = mtd_to_nand(mtd); 216 struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip); 217 int rv; 218 219 if ((nfc_read(mtd, NFC_CONFIG2) & NFC_INT) == 0) { 220 nfc_clear(mtd, NFC_CONFIG1, NFC_INT_MASK); 221 rv = wait_event_timeout(prv->irq_waitq, 222 (nfc_read(mtd, NFC_CONFIG2) & NFC_INT), NFC_TIMEOUT); 223 224 if (!rv) 225 dev_warn(prv->dev, 226 "Timeout while waiting for interrupt.\n"); 227 } 228 229 nfc_clear(mtd, NFC_CONFIG2, NFC_INT); 230 } 231 232 /* Do address cycle(s) */ 233 static void mpc5121_nfc_addr_cycle(struct mtd_info *mtd, int column, int page) 234 { 235 struct nand_chip *chip = mtd_to_nand(mtd); 236 u32 pagemask = chip->pagemask; 237 238 if (column != -1) { 239 mpc5121_nfc_send_addr(mtd, column); 240 if (mtd->writesize > 512) 241 mpc5121_nfc_send_addr(mtd, column >> 8); 242 } 243 244 if (page != -1) { 245 do { 246 mpc5121_nfc_send_addr(mtd, page & 0xFF); 247 page >>= 8; 248 pagemask >>= 8; 249 } while (pagemask); 250 } 251 } 252 253 /* Control chip select signals */ 254 static void mpc5121_nfc_select_chip(struct nand_chip *nand, int chip) 255 { 256 struct mtd_info *mtd = nand_to_mtd(nand); 257 258 if (chip < 0) { 259 nfc_clear(mtd, NFC_CONFIG1, NFC_CE); 260 return; 261 } 262 263 nfc_clear(mtd, NFC_BUF_ADDR, NFC_ACTIVE_CS_MASK); 264 nfc_set(mtd, NFC_BUF_ADDR, (chip << NFC_ACTIVE_CS_SHIFT) & 265 NFC_ACTIVE_CS_MASK); 266 nfc_set(mtd, NFC_CONFIG1, NFC_CE); 267 } 268 269 /* Init external chip select logic on ADS5121 board */ 270 static int ads5121_chipselect_init(struct mtd_info *mtd) 271 { 272 struct nand_chip *chip = mtd_to_nand(mtd); 273 struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip); 274 struct device_node *dn; 275 276 dn = of_find_compatible_node(NULL, NULL, "fsl,mpc5121ads-cpld"); 277 if (dn) { 278 prv->csreg = of_iomap(dn, 0); 279 of_node_put(dn); 280 if (!prv->csreg) 281 return -ENOMEM; 282 283 /* CPLD Register 9 controls NAND /CE Lines */ 284 prv->csreg += 9; 285 return 0; 286 } 287 288 return -EINVAL; 289 } 290 291 /* Control chips select signal on ADS5121 board */ 292 static void ads5121_select_chip(struct nand_chip *nand, int chip) 293 { 294 struct mtd_info *mtd = nand_to_mtd(nand); 295 struct mpc5121_nfc_prv *prv = nand_get_controller_data(nand); 296 u8 v; 297 298 v = in_8(prv->csreg); 299 v |= 0x0F; 300 301 if (chip >= 0) { 302 mpc5121_nfc_select_chip(nand, 0); 303 v &= ~(1 << chip); 304 } else 305 mpc5121_nfc_select_chip(nand, -1); 306 307 out_8(prv->csreg, v); 308 } 309 310 /* Read NAND Ready/Busy signal */ 311 static int mpc5121_nfc_dev_ready(struct nand_chip *nand) 312 { 313 /* 314 * NFC handles ready/busy signal internally. Therefore, this function 315 * always returns status as ready. 316 */ 317 return 1; 318 } 319 320 /* Write command to NAND flash */ 321 static void mpc5121_nfc_command(struct nand_chip *chip, unsigned command, 322 int column, int page) 323 { 324 struct mtd_info *mtd = nand_to_mtd(chip); 325 struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip); 326 327 prv->column = (column >= 0) ? column : 0; 328 prv->spareonly = 0; 329 330 switch (command) { 331 case NAND_CMD_PAGEPROG: 332 mpc5121_nfc_send_prog_page(mtd); 333 break; 334 /* 335 * NFC does not support sub-page reads and writes, 336 * so emulate them using full page transfers. 337 */ 338 case NAND_CMD_READ0: 339 column = 0; 340 break; 341 342 case NAND_CMD_READ1: 343 prv->column += 256; 344 command = NAND_CMD_READ0; 345 column = 0; 346 break; 347 348 case NAND_CMD_READOOB: 349 prv->spareonly = 1; 350 command = NAND_CMD_READ0; 351 column = 0; 352 break; 353 354 case NAND_CMD_SEQIN: 355 mpc5121_nfc_command(chip, NAND_CMD_READ0, column, page); 356 column = 0; 357 break; 358 359 case NAND_CMD_ERASE1: 360 case NAND_CMD_ERASE2: 361 case NAND_CMD_READID: 362 case NAND_CMD_STATUS: 363 break; 364 365 default: 366 return; 367 } 368 369 mpc5121_nfc_send_cmd(mtd, command); 370 mpc5121_nfc_addr_cycle(mtd, column, page); 371 372 switch (command) { 373 case NAND_CMD_READ0: 374 if (mtd->writesize > 512) 375 mpc5121_nfc_send_cmd(mtd, NAND_CMD_READSTART); 376 mpc5121_nfc_send_read_page(mtd); 377 break; 378 379 case NAND_CMD_READID: 380 mpc5121_nfc_send_read_id(mtd); 381 break; 382 383 case NAND_CMD_STATUS: 384 mpc5121_nfc_send_read_status(mtd); 385 if (chip->options & NAND_BUSWIDTH_16) 386 prv->column = 1; 387 else 388 prv->column = 0; 389 break; 390 } 391 } 392 393 /* Copy data from/to NFC spare buffers. */ 394 static void mpc5121_nfc_copy_spare(struct mtd_info *mtd, uint offset, 395 u8 *buffer, uint size, int wr) 396 { 397 struct nand_chip *nand = mtd_to_nand(mtd); 398 struct mpc5121_nfc_prv *prv = nand_get_controller_data(nand); 399 uint o, s, sbsize, blksize; 400 401 /* 402 * NAND spare area is available through NFC spare buffers. 403 * The NFC divides spare area into (page_size / 512) chunks. 404 * Each chunk is placed into separate spare memory area, using 405 * first (spare_size / num_of_chunks) bytes of the buffer. 406 * 407 * For NAND device in which the spare area is not divided fully 408 * by the number of chunks, number of used bytes in each spare 409 * buffer is rounded down to the nearest even number of bytes, 410 * and all remaining bytes are added to the last used spare area. 411 * 412 * For more information read section 26.6.10 of MPC5121e 413 * Microcontroller Reference Manual, Rev. 3. 414 */ 415 416 /* Calculate number of valid bytes in each spare buffer */ 417 sbsize = (mtd->oobsize / (mtd->writesize / 512)) & ~1; 418 419 while (size) { 420 /* Calculate spare buffer number */ 421 s = offset / sbsize; 422 if (s > NFC_SPARE_BUFFERS - 1) 423 s = NFC_SPARE_BUFFERS - 1; 424 425 /* 426 * Calculate offset to requested data block in selected spare 427 * buffer and its size. 428 */ 429 o = offset - (s * sbsize); 430 blksize = min(sbsize - o, size); 431 432 if (wr) 433 memcpy_toio(prv->regs + NFC_SPARE_AREA(s) + o, 434 buffer, blksize); 435 else 436 memcpy_fromio(buffer, 437 prv->regs + NFC_SPARE_AREA(s) + o, blksize); 438 439 buffer += blksize; 440 offset += blksize; 441 size -= blksize; 442 } 443 } 444 445 /* Copy data from/to NFC main and spare buffers */ 446 static void mpc5121_nfc_buf_copy(struct mtd_info *mtd, u_char *buf, int len, 447 int wr) 448 { 449 struct nand_chip *chip = mtd_to_nand(mtd); 450 struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip); 451 uint c = prv->column; 452 uint l; 453 454 /* Handle spare area access */ 455 if (prv->spareonly || c >= mtd->writesize) { 456 /* Calculate offset from beginning of spare area */ 457 if (c >= mtd->writesize) 458 c -= mtd->writesize; 459 460 prv->column += len; 461 mpc5121_nfc_copy_spare(mtd, c, buf, len, wr); 462 return; 463 } 464 465 /* 466 * Handle main area access - limit copy length to prevent 467 * crossing main/spare boundary. 468 */ 469 l = min((uint)len, mtd->writesize - c); 470 prv->column += l; 471 472 if (wr) 473 memcpy_toio(prv->regs + NFC_MAIN_AREA(0) + c, buf, l); 474 else 475 memcpy_fromio(buf, prv->regs + NFC_MAIN_AREA(0) + c, l); 476 477 /* Handle crossing main/spare boundary */ 478 if (l != len) { 479 buf += l; 480 len -= l; 481 mpc5121_nfc_buf_copy(mtd, buf, len, wr); 482 } 483 } 484 485 /* Read data from NFC buffers */ 486 static void mpc5121_nfc_read_buf(struct nand_chip *chip, u_char *buf, int len) 487 { 488 mpc5121_nfc_buf_copy(nand_to_mtd(chip), buf, len, 0); 489 } 490 491 /* Write data to NFC buffers */ 492 static void mpc5121_nfc_write_buf(struct nand_chip *chip, const u_char *buf, 493 int len) 494 { 495 mpc5121_nfc_buf_copy(nand_to_mtd(chip), (u_char *)buf, len, 1); 496 } 497 498 /* Read byte from NFC buffers */ 499 static u8 mpc5121_nfc_read_byte(struct nand_chip *chip) 500 { 501 u8 tmp; 502 503 mpc5121_nfc_read_buf(chip, &tmp, sizeof(tmp)); 504 505 return tmp; 506 } 507 508 /* 509 * Read NFC configuration from Reset Config Word 510 * 511 * NFC is configured during reset in basis of information stored 512 * in Reset Config Word. There is no other way to set NAND block 513 * size, spare size and bus width. 514 */ 515 static int mpc5121_nfc_read_hw_config(struct mtd_info *mtd) 516 { 517 struct nand_chip *chip = mtd_to_nand(mtd); 518 struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip); 519 struct mpc512x_reset_module *rm; 520 struct device_node *rmnode; 521 uint rcw_pagesize = 0; 522 uint rcw_sparesize = 0; 523 uint rcw_width; 524 uint rcwh; 525 uint romloc, ps; 526 int ret = 0; 527 528 rmnode = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-reset"); 529 if (!rmnode) { 530 dev_err(prv->dev, "Missing 'fsl,mpc5121-reset' " 531 "node in device tree!\n"); 532 return -ENODEV; 533 } 534 535 rm = of_iomap(rmnode, 0); 536 if (!rm) { 537 dev_err(prv->dev, "Error mapping reset module node!\n"); 538 ret = -EBUSY; 539 goto out; 540 } 541 542 rcwh = in_be32(&rm->rcwhr); 543 544 /* Bit 6: NFC bus width */ 545 rcw_width = ((rcwh >> 6) & 0x1) ? 2 : 1; 546 547 /* Bit 7: NFC Page/Spare size */ 548 ps = (rcwh >> 7) & 0x1; 549 550 /* Bits [22:21]: ROM Location */ 551 romloc = (rcwh >> 21) & 0x3; 552 553 /* Decode RCW bits */ 554 switch ((ps << 2) | romloc) { 555 case 0x00: 556 case 0x01: 557 rcw_pagesize = 512; 558 rcw_sparesize = 16; 559 break; 560 case 0x02: 561 case 0x03: 562 rcw_pagesize = 4096; 563 rcw_sparesize = 128; 564 break; 565 case 0x04: 566 case 0x05: 567 rcw_pagesize = 2048; 568 rcw_sparesize = 64; 569 break; 570 case 0x06: 571 case 0x07: 572 rcw_pagesize = 4096; 573 rcw_sparesize = 218; 574 break; 575 } 576 577 mtd->writesize = rcw_pagesize; 578 mtd->oobsize = rcw_sparesize; 579 if (rcw_width == 2) 580 chip->options |= NAND_BUSWIDTH_16; 581 582 dev_notice(prv->dev, "Configured for " 583 "%u-bit NAND, page size %u " 584 "with %u spare.\n", 585 rcw_width * 8, rcw_pagesize, 586 rcw_sparesize); 587 iounmap(rm); 588 out: 589 of_node_put(rmnode); 590 return ret; 591 } 592 593 /* Free driver resources */ 594 static void mpc5121_nfc_free(struct device *dev, struct mtd_info *mtd) 595 { 596 struct nand_chip *chip = mtd_to_nand(mtd); 597 struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip); 598 599 if (prv->clk) 600 clk_disable_unprepare(prv->clk); 601 602 if (prv->csreg) 603 iounmap(prv->csreg); 604 } 605 606 static int mpc5121_nfc_attach_chip(struct nand_chip *chip) 607 { 608 chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT; 609 610 if (chip->ecc.algo == NAND_ECC_ALGO_UNKNOWN) 611 chip->ecc.algo = NAND_ECC_ALGO_HAMMING; 612 613 return 0; 614 } 615 616 static const struct nand_controller_ops mpc5121_nfc_ops = { 617 .attach_chip = mpc5121_nfc_attach_chip, 618 }; 619 620 static int mpc5121_nfc_probe(struct platform_device *op) 621 { 622 struct device_node *dn = op->dev.of_node; 623 struct clk *clk; 624 struct device *dev = &op->dev; 625 struct mpc5121_nfc_prv *prv; 626 struct resource res; 627 struct mtd_info *mtd; 628 struct nand_chip *chip; 629 unsigned long regs_paddr, regs_size; 630 const __be32 *chips_no; 631 int resettime = 0; 632 int retval = 0; 633 int rev, len; 634 635 /* 636 * Check SoC revision. This driver supports only NFC 637 * in MPC5121 revision 2 and MPC5123 revision 3. 638 */ 639 rev = (mfspr(SPRN_SVR) >> 4) & 0xF; 640 if ((rev != 2) && (rev != 3)) { 641 dev_err(dev, "SoC revision %u is not supported!\n", rev); 642 return -ENXIO; 643 } 644 645 prv = devm_kzalloc(dev, sizeof(*prv), GFP_KERNEL); 646 if (!prv) 647 return -ENOMEM; 648 649 chip = &prv->chip; 650 mtd = nand_to_mtd(chip); 651 652 nand_controller_init(&prv->controller); 653 prv->controller.ops = &mpc5121_nfc_ops; 654 chip->controller = &prv->controller; 655 656 mtd->dev.parent = dev; 657 nand_set_controller_data(chip, prv); 658 nand_set_flash_node(chip, dn); 659 prv->dev = dev; 660 661 /* Read NFC configuration from Reset Config Word */ 662 retval = mpc5121_nfc_read_hw_config(mtd); 663 if (retval) { 664 dev_err(dev, "Unable to read NFC config!\n"); 665 return retval; 666 } 667 668 prv->irq = irq_of_parse_and_map(dn, 0); 669 if (prv->irq == NO_IRQ) { 670 dev_err(dev, "Error mapping IRQ!\n"); 671 return -EINVAL; 672 } 673 674 retval = of_address_to_resource(dn, 0, &res); 675 if (retval) { 676 dev_err(dev, "Error parsing memory region!\n"); 677 return retval; 678 } 679 680 chips_no = of_get_property(dn, "chips", &len); 681 if (!chips_no || len != sizeof(*chips_no)) { 682 dev_err(dev, "Invalid/missing 'chips' property!\n"); 683 return -EINVAL; 684 } 685 686 regs_paddr = res.start; 687 regs_size = resource_size(&res); 688 689 if (!devm_request_mem_region(dev, regs_paddr, regs_size, DRV_NAME)) { 690 dev_err(dev, "Error requesting memory region!\n"); 691 return -EBUSY; 692 } 693 694 prv->regs = devm_ioremap(dev, regs_paddr, regs_size); 695 if (!prv->regs) { 696 dev_err(dev, "Error mapping memory region!\n"); 697 return -ENOMEM; 698 } 699 700 mtd->name = "MPC5121 NAND"; 701 chip->legacy.dev_ready = mpc5121_nfc_dev_ready; 702 chip->legacy.cmdfunc = mpc5121_nfc_command; 703 chip->legacy.read_byte = mpc5121_nfc_read_byte; 704 chip->legacy.read_buf = mpc5121_nfc_read_buf; 705 chip->legacy.write_buf = mpc5121_nfc_write_buf; 706 chip->legacy.select_chip = mpc5121_nfc_select_chip; 707 chip->legacy.set_features = nand_get_set_features_notsupp; 708 chip->legacy.get_features = nand_get_set_features_notsupp; 709 chip->bbt_options = NAND_BBT_USE_FLASH; 710 711 /* Support external chip-select logic on ADS5121 board */ 712 if (of_machine_is_compatible("fsl,mpc5121ads")) { 713 retval = ads5121_chipselect_init(mtd); 714 if (retval) { 715 dev_err(dev, "Chipselect init error!\n"); 716 return retval; 717 } 718 719 chip->legacy.select_chip = ads5121_select_chip; 720 } 721 722 /* Enable NFC clock */ 723 clk = devm_clk_get(dev, "ipg"); 724 if (IS_ERR(clk)) { 725 dev_err(dev, "Unable to acquire NFC clock!\n"); 726 retval = PTR_ERR(clk); 727 goto error; 728 } 729 retval = clk_prepare_enable(clk); 730 if (retval) { 731 dev_err(dev, "Unable to enable NFC clock!\n"); 732 goto error; 733 } 734 prv->clk = clk; 735 736 /* Reset NAND Flash controller */ 737 nfc_set(mtd, NFC_CONFIG1, NFC_RESET); 738 while (nfc_read(mtd, NFC_CONFIG1) & NFC_RESET) { 739 if (resettime++ >= NFC_RESET_TIMEOUT) { 740 dev_err(dev, "Timeout while resetting NFC!\n"); 741 retval = -EINVAL; 742 goto error; 743 } 744 745 udelay(1); 746 } 747 748 /* Enable write to NFC memory */ 749 nfc_write(mtd, NFC_CONFIG, NFC_BLS_UNLOCKED); 750 751 /* Enable write to all NAND pages */ 752 nfc_write(mtd, NFC_UNLOCKSTART_BLK0, 0x0000); 753 nfc_write(mtd, NFC_UNLOCKEND_BLK0, 0xFFFF); 754 nfc_write(mtd, NFC_WRPROT, NFC_WPC_UNLOCK); 755 756 /* 757 * Setup NFC: 758 * - Big Endian transfers, 759 * - Interrupt after full page read/write. 760 */ 761 nfc_write(mtd, NFC_CONFIG1, NFC_BIG_ENDIAN | NFC_INT_MASK | 762 NFC_FULL_PAGE_INT); 763 764 /* Set spare area size */ 765 nfc_write(mtd, NFC_SPAS, mtd->oobsize >> 1); 766 767 init_waitqueue_head(&prv->irq_waitq); 768 retval = devm_request_irq(dev, prv->irq, &mpc5121_nfc_irq, 0, DRV_NAME, 769 mtd); 770 if (retval) { 771 dev_err(dev, "Error requesting IRQ!\n"); 772 goto error; 773 } 774 775 /* Detect NAND chips */ 776 retval = nand_scan(chip, be32_to_cpup(chips_no)); 777 if (retval) { 778 dev_err(dev, "NAND Flash not found !\n"); 779 goto error; 780 } 781 782 /* Set erase block size */ 783 switch (mtd->erasesize / mtd->writesize) { 784 case 32: 785 nfc_set(mtd, NFC_CONFIG1, NFC_PPB_32); 786 break; 787 788 case 64: 789 nfc_set(mtd, NFC_CONFIG1, NFC_PPB_64); 790 break; 791 792 case 128: 793 nfc_set(mtd, NFC_CONFIG1, NFC_PPB_128); 794 break; 795 796 case 256: 797 nfc_set(mtd, NFC_CONFIG1, NFC_PPB_256); 798 break; 799 800 default: 801 dev_err(dev, "Unsupported NAND flash!\n"); 802 retval = -ENXIO; 803 goto error; 804 } 805 806 dev_set_drvdata(dev, mtd); 807 808 /* Register device in MTD */ 809 retval = mtd_device_register(mtd, NULL, 0); 810 if (retval) { 811 dev_err(dev, "Error adding MTD device!\n"); 812 goto error; 813 } 814 815 return 0; 816 error: 817 mpc5121_nfc_free(dev, mtd); 818 return retval; 819 } 820 821 static int mpc5121_nfc_remove(struct platform_device *op) 822 { 823 struct device *dev = &op->dev; 824 struct mtd_info *mtd = dev_get_drvdata(dev); 825 int ret; 826 827 ret = mtd_device_unregister(mtd); 828 WARN_ON(ret); 829 nand_cleanup(mtd_to_nand(mtd)); 830 mpc5121_nfc_free(dev, mtd); 831 832 return 0; 833 } 834 835 static const struct of_device_id mpc5121_nfc_match[] = { 836 { .compatible = "fsl,mpc5121-nfc", }, 837 {}, 838 }; 839 MODULE_DEVICE_TABLE(of, mpc5121_nfc_match); 840 841 static struct platform_driver mpc5121_nfc_driver = { 842 .probe = mpc5121_nfc_probe, 843 .remove = mpc5121_nfc_remove, 844 .driver = { 845 .name = DRV_NAME, 846 .of_match_table = mpc5121_nfc_match, 847 }, 848 }; 849 850 module_platform_driver(mpc5121_nfc_driver); 851 852 MODULE_AUTHOR("Freescale Semiconductor, Inc."); 853 MODULE_DESCRIPTION("MPC5121 NAND MTD driver"); 854 MODULE_LICENSE("GPL"); 855