1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2018 Stefan Agner <stefan@agner.ch> 4 * Copyright (C) 2014-2015 Lucas Stach <dev@lynxeye.de> 5 * Copyright (C) 2012 Avionic Design GmbH 6 */ 7 8 #include <linux/clk.h> 9 #include <linux/completion.h> 10 #include <linux/dma-mapping.h> 11 #include <linux/err.h> 12 #include <linux/gpio/consumer.h> 13 #include <linux/interrupt.h> 14 #include <linux/io.h> 15 #include <linux/module.h> 16 #include <linux/mtd/partitions.h> 17 #include <linux/mtd/rawnand.h> 18 #include <linux/of.h> 19 #include <linux/platform_device.h> 20 #include <linux/reset.h> 21 22 #define COMMAND 0x00 23 #define COMMAND_GO BIT(31) 24 #define COMMAND_CLE BIT(30) 25 #define COMMAND_ALE BIT(29) 26 #define COMMAND_PIO BIT(28) 27 #define COMMAND_TX BIT(27) 28 #define COMMAND_RX BIT(26) 29 #define COMMAND_SEC_CMD BIT(25) 30 #define COMMAND_AFT_DAT BIT(24) 31 #define COMMAND_TRANS_SIZE(size) ((((size) - 1) & 0xf) << 20) 32 #define COMMAND_A_VALID BIT(19) 33 #define COMMAND_B_VALID BIT(18) 34 #define COMMAND_RD_STATUS_CHK BIT(17) 35 #define COMMAND_RBSY_CHK BIT(16) 36 #define COMMAND_CE(x) BIT(8 + ((x) & 0x7)) 37 #define COMMAND_CLE_SIZE(size) ((((size) - 1) & 0x3) << 4) 38 #define COMMAND_ALE_SIZE(size) ((((size) - 1) & 0xf) << 0) 39 40 #define STATUS 0x04 41 42 #define ISR 0x08 43 #define ISR_CORRFAIL_ERR BIT(24) 44 #define ISR_UND BIT(7) 45 #define ISR_OVR BIT(6) 46 #define ISR_CMD_DONE BIT(5) 47 #define ISR_ECC_ERR BIT(4) 48 49 #define IER 0x0c 50 #define IER_ERR_TRIG_VAL(x) (((x) & 0xf) << 16) 51 #define IER_UND BIT(7) 52 #define IER_OVR BIT(6) 53 #define IER_CMD_DONE BIT(5) 54 #define IER_ECC_ERR BIT(4) 55 #define IER_GIE BIT(0) 56 57 #define CONFIG 0x10 58 #define CONFIG_HW_ECC BIT(31) 59 #define CONFIG_ECC_SEL BIT(30) 60 #define CONFIG_ERR_COR BIT(29) 61 #define CONFIG_PIPE_EN BIT(28) 62 #define CONFIG_TVAL_4 (0 << 24) 63 #define CONFIG_TVAL_6 (1 << 24) 64 #define CONFIG_TVAL_8 (2 << 24) 65 #define CONFIG_SKIP_SPARE BIT(23) 66 #define CONFIG_BUS_WIDTH_16 BIT(21) 67 #define CONFIG_COM_BSY BIT(20) 68 #define CONFIG_PS_256 (0 << 16) 69 #define CONFIG_PS_512 (1 << 16) 70 #define CONFIG_PS_1024 (2 << 16) 71 #define CONFIG_PS_2048 (3 << 16) 72 #define CONFIG_PS_4096 (4 << 16) 73 #define CONFIG_SKIP_SPARE_SIZE_4 (0 << 14) 74 #define CONFIG_SKIP_SPARE_SIZE_8 (1 << 14) 75 #define CONFIG_SKIP_SPARE_SIZE_12 (2 << 14) 76 #define CONFIG_SKIP_SPARE_SIZE_16 (3 << 14) 77 #define CONFIG_TAG_BYTE_SIZE(x) ((x) & 0xff) 78 79 #define TIMING_1 0x14 80 #define TIMING_TRP_RESP(x) (((x) & 0xf) << 28) 81 #define TIMING_TWB(x) (((x) & 0xf) << 24) 82 #define TIMING_TCR_TAR_TRR(x) (((x) & 0xf) << 20) 83 #define TIMING_TWHR(x) (((x) & 0xf) << 16) 84 #define TIMING_TCS(x) (((x) & 0x3) << 14) 85 #define TIMING_TWH(x) (((x) & 0x3) << 12) 86 #define TIMING_TWP(x) (((x) & 0xf) << 8) 87 #define TIMING_TRH(x) (((x) & 0x3) << 4) 88 #define TIMING_TRP(x) (((x) & 0xf) << 0) 89 90 #define RESP 0x18 91 92 #define TIMING_2 0x1c 93 #define TIMING_TADL(x) ((x) & 0xf) 94 95 #define CMD_REG1 0x20 96 #define CMD_REG2 0x24 97 #define ADDR_REG1 0x28 98 #define ADDR_REG2 0x2c 99 100 #define DMA_MST_CTRL 0x30 101 #define DMA_MST_CTRL_GO BIT(31) 102 #define DMA_MST_CTRL_IN (0 << 30) 103 #define DMA_MST_CTRL_OUT BIT(30) 104 #define DMA_MST_CTRL_PERF_EN BIT(29) 105 #define DMA_MST_CTRL_IE_DONE BIT(28) 106 #define DMA_MST_CTRL_REUSE BIT(27) 107 #define DMA_MST_CTRL_BURST_1 (2 << 24) 108 #define DMA_MST_CTRL_BURST_4 (3 << 24) 109 #define DMA_MST_CTRL_BURST_8 (4 << 24) 110 #define DMA_MST_CTRL_BURST_16 (5 << 24) 111 #define DMA_MST_CTRL_IS_DONE BIT(20) 112 #define DMA_MST_CTRL_EN_A BIT(2) 113 #define DMA_MST_CTRL_EN_B BIT(1) 114 115 #define DMA_CFG_A 0x34 116 #define DMA_CFG_B 0x38 117 118 #define FIFO_CTRL 0x3c 119 #define FIFO_CTRL_CLR_ALL BIT(3) 120 121 #define DATA_PTR 0x40 122 #define TAG_PTR 0x44 123 #define ECC_PTR 0x48 124 125 #define DEC_STATUS 0x4c 126 #define DEC_STATUS_A_ECC_FAIL BIT(1) 127 #define DEC_STATUS_ERR_COUNT_MASK 0x00ff0000 128 #define DEC_STATUS_ERR_COUNT_SHIFT 16 129 130 #define HWSTATUS_CMD 0x50 131 #define HWSTATUS_MASK 0x54 132 #define HWSTATUS_RDSTATUS_MASK(x) (((x) & 0xff) << 24) 133 #define HWSTATUS_RDSTATUS_VALUE(x) (((x) & 0xff) << 16) 134 #define HWSTATUS_RBSY_MASK(x) (((x) & 0xff) << 8) 135 #define HWSTATUS_RBSY_VALUE(x) (((x) & 0xff) << 0) 136 137 #define BCH_CONFIG 0xcc 138 #define BCH_ENABLE BIT(0) 139 #define BCH_TVAL_4 (0 << 4) 140 #define BCH_TVAL_8 (1 << 4) 141 #define BCH_TVAL_14 (2 << 4) 142 #define BCH_TVAL_16 (3 << 4) 143 144 #define DEC_STAT_RESULT 0xd0 145 #define DEC_STAT_BUF 0xd4 146 #define DEC_STAT_BUF_FAIL_SEC_FLAG_MASK 0xff000000 147 #define DEC_STAT_BUF_FAIL_SEC_FLAG_SHIFT 24 148 #define DEC_STAT_BUF_CORR_SEC_FLAG_MASK 0x00ff0000 149 #define DEC_STAT_BUF_CORR_SEC_FLAG_SHIFT 16 150 #define DEC_STAT_BUF_MAX_CORR_CNT_MASK 0x00001f00 151 #define DEC_STAT_BUF_MAX_CORR_CNT_SHIFT 8 152 153 #define OFFSET(val, off) ((val) < (off) ? 0 : (val) - (off)) 154 155 #define SKIP_SPARE_BYTES 4 156 #define BITS_PER_STEP_RS 18 157 #define BITS_PER_STEP_BCH 13 158 159 #define INT_MASK (IER_UND | IER_OVR | IER_CMD_DONE | IER_GIE) 160 #define HWSTATUS_CMD_DEFAULT NAND_STATUS_READY 161 #define HWSTATUS_MASK_DEFAULT (HWSTATUS_RDSTATUS_MASK(1) | \ 162 HWSTATUS_RDSTATUS_VALUE(0) | \ 163 HWSTATUS_RBSY_MASK(NAND_STATUS_READY) | \ 164 HWSTATUS_RBSY_VALUE(NAND_STATUS_READY)) 165 166 struct tegra_nand_controller { 167 struct nand_controller controller; 168 struct device *dev; 169 void __iomem *regs; 170 int irq; 171 struct clk *clk; 172 struct completion command_complete; 173 struct completion dma_complete; 174 bool last_read_error; 175 int cur_cs; 176 struct nand_chip *chip; 177 }; 178 179 struct tegra_nand_chip { 180 struct nand_chip chip; 181 struct gpio_desc *wp_gpio; 182 struct mtd_oob_region ecc; 183 u32 config; 184 u32 config_ecc; 185 u32 bch_config; 186 int cs[1]; 187 }; 188 189 static inline struct tegra_nand_controller * 190 to_tegra_ctrl(struct nand_controller *hw_ctrl) 191 { 192 return container_of(hw_ctrl, struct tegra_nand_controller, controller); 193 } 194 195 static inline struct tegra_nand_chip *to_tegra_chip(struct nand_chip *chip) 196 { 197 return container_of(chip, struct tegra_nand_chip, chip); 198 } 199 200 static int tegra_nand_ooblayout_rs_ecc(struct mtd_info *mtd, int section, 201 struct mtd_oob_region *oobregion) 202 { 203 struct nand_chip *chip = mtd_to_nand(mtd); 204 int bytes_per_step = DIV_ROUND_UP(BITS_PER_STEP_RS * chip->ecc.strength, 205 BITS_PER_BYTE); 206 207 if (section > 0) 208 return -ERANGE; 209 210 oobregion->offset = SKIP_SPARE_BYTES; 211 oobregion->length = round_up(bytes_per_step * chip->ecc.steps, 4); 212 213 return 0; 214 } 215 216 static int tegra_nand_ooblayout_no_free(struct mtd_info *mtd, int section, 217 struct mtd_oob_region *oobregion) 218 { 219 return -ERANGE; 220 } 221 222 static const struct mtd_ooblayout_ops tegra_nand_oob_rs_ops = { 223 .ecc = tegra_nand_ooblayout_rs_ecc, 224 .free = tegra_nand_ooblayout_no_free, 225 }; 226 227 static int tegra_nand_ooblayout_bch_ecc(struct mtd_info *mtd, int section, 228 struct mtd_oob_region *oobregion) 229 { 230 struct nand_chip *chip = mtd_to_nand(mtd); 231 int bytes_per_step = DIV_ROUND_UP(BITS_PER_STEP_BCH * chip->ecc.strength, 232 BITS_PER_BYTE); 233 234 if (section > 0) 235 return -ERANGE; 236 237 oobregion->offset = SKIP_SPARE_BYTES; 238 oobregion->length = round_up(bytes_per_step * chip->ecc.steps, 4); 239 240 return 0; 241 } 242 243 static const struct mtd_ooblayout_ops tegra_nand_oob_bch_ops = { 244 .ecc = tegra_nand_ooblayout_bch_ecc, 245 .free = tegra_nand_ooblayout_no_free, 246 }; 247 248 static irqreturn_t tegra_nand_irq(int irq, void *data) 249 { 250 struct tegra_nand_controller *ctrl = data; 251 u32 isr, dma; 252 253 isr = readl_relaxed(ctrl->regs + ISR); 254 dma = readl_relaxed(ctrl->regs + DMA_MST_CTRL); 255 dev_dbg(ctrl->dev, "isr %08x\n", isr); 256 257 if (!isr && !(dma & DMA_MST_CTRL_IS_DONE)) 258 return IRQ_NONE; 259 260 /* 261 * The bit name is somewhat missleading: This is also set when 262 * HW ECC was successful. The data sheet states: 263 * Correctable OR Un-correctable errors occurred in the DMA transfer... 264 */ 265 if (isr & ISR_CORRFAIL_ERR) 266 ctrl->last_read_error = true; 267 268 if (isr & ISR_CMD_DONE) 269 complete(&ctrl->command_complete); 270 271 if (isr & ISR_UND) 272 dev_err(ctrl->dev, "FIFO underrun\n"); 273 274 if (isr & ISR_OVR) 275 dev_err(ctrl->dev, "FIFO overrun\n"); 276 277 /* handle DMA interrupts */ 278 if (dma & DMA_MST_CTRL_IS_DONE) { 279 writel_relaxed(dma, ctrl->regs + DMA_MST_CTRL); 280 complete(&ctrl->dma_complete); 281 } 282 283 /* clear interrupts */ 284 writel_relaxed(isr, ctrl->regs + ISR); 285 286 return IRQ_HANDLED; 287 } 288 289 static const char * const tegra_nand_reg_names[] = { 290 "COMMAND", 291 "STATUS", 292 "ISR", 293 "IER", 294 "CONFIG", 295 "TIMING", 296 NULL, 297 "TIMING2", 298 "CMD_REG1", 299 "CMD_REG2", 300 "ADDR_REG1", 301 "ADDR_REG2", 302 "DMA_MST_CTRL", 303 "DMA_CFG_A", 304 "DMA_CFG_B", 305 "FIFO_CTRL", 306 }; 307 308 static void tegra_nand_dump_reg(struct tegra_nand_controller *ctrl) 309 { 310 u32 reg; 311 int i; 312 313 dev_err(ctrl->dev, "Tegra NAND controller register dump\n"); 314 for (i = 0; i < ARRAY_SIZE(tegra_nand_reg_names); i++) { 315 const char *reg_name = tegra_nand_reg_names[i]; 316 317 if (!reg_name) 318 continue; 319 320 reg = readl_relaxed(ctrl->regs + (i * 4)); 321 dev_err(ctrl->dev, "%s: 0x%08x\n", reg_name, reg); 322 } 323 } 324 325 static void tegra_nand_controller_abort(struct tegra_nand_controller *ctrl) 326 { 327 u32 isr, dma; 328 329 disable_irq(ctrl->irq); 330 331 /* Abort current command/DMA operation */ 332 writel_relaxed(0, ctrl->regs + DMA_MST_CTRL); 333 writel_relaxed(0, ctrl->regs + COMMAND); 334 335 /* clear interrupts */ 336 isr = readl_relaxed(ctrl->regs + ISR); 337 writel_relaxed(isr, ctrl->regs + ISR); 338 dma = readl_relaxed(ctrl->regs + DMA_MST_CTRL); 339 writel_relaxed(dma, ctrl->regs + DMA_MST_CTRL); 340 341 reinit_completion(&ctrl->command_complete); 342 reinit_completion(&ctrl->dma_complete); 343 344 enable_irq(ctrl->irq); 345 } 346 347 static int tegra_nand_cmd(struct nand_chip *chip, 348 const struct nand_subop *subop) 349 { 350 const struct nand_op_instr *instr; 351 const struct nand_op_instr *instr_data_in = NULL; 352 struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller); 353 unsigned int op_id, size = 0, offset = 0; 354 bool first_cmd = true; 355 u32 reg, cmd = 0; 356 int ret; 357 358 for (op_id = 0; op_id < subop->ninstrs; op_id++) { 359 unsigned int naddrs, i; 360 const u8 *addrs; 361 u32 addr1 = 0, addr2 = 0; 362 363 instr = &subop->instrs[op_id]; 364 365 switch (instr->type) { 366 case NAND_OP_CMD_INSTR: 367 if (first_cmd) { 368 cmd |= COMMAND_CLE; 369 writel_relaxed(instr->ctx.cmd.opcode, 370 ctrl->regs + CMD_REG1); 371 } else { 372 cmd |= COMMAND_SEC_CMD; 373 writel_relaxed(instr->ctx.cmd.opcode, 374 ctrl->regs + CMD_REG2); 375 } 376 first_cmd = false; 377 break; 378 379 case NAND_OP_ADDR_INSTR: 380 offset = nand_subop_get_addr_start_off(subop, op_id); 381 naddrs = nand_subop_get_num_addr_cyc(subop, op_id); 382 addrs = &instr->ctx.addr.addrs[offset]; 383 384 cmd |= COMMAND_ALE | COMMAND_ALE_SIZE(naddrs); 385 for (i = 0; i < min_t(unsigned int, 4, naddrs); i++) 386 addr1 |= *addrs++ << (BITS_PER_BYTE * i); 387 naddrs -= i; 388 for (i = 0; i < min_t(unsigned int, 4, naddrs); i++) 389 addr2 |= *addrs++ << (BITS_PER_BYTE * i); 390 391 writel_relaxed(addr1, ctrl->regs + ADDR_REG1); 392 writel_relaxed(addr2, ctrl->regs + ADDR_REG2); 393 break; 394 395 case NAND_OP_DATA_IN_INSTR: 396 size = nand_subop_get_data_len(subop, op_id); 397 offset = nand_subop_get_data_start_off(subop, op_id); 398 399 cmd |= COMMAND_TRANS_SIZE(size) | COMMAND_PIO | 400 COMMAND_RX | COMMAND_A_VALID; 401 402 instr_data_in = instr; 403 break; 404 405 case NAND_OP_DATA_OUT_INSTR: 406 size = nand_subop_get_data_len(subop, op_id); 407 offset = nand_subop_get_data_start_off(subop, op_id); 408 409 cmd |= COMMAND_TRANS_SIZE(size) | COMMAND_PIO | 410 COMMAND_TX | COMMAND_A_VALID; 411 memcpy(®, instr->ctx.data.buf.out + offset, size); 412 413 writel_relaxed(reg, ctrl->regs + RESP); 414 break; 415 416 case NAND_OP_WAITRDY_INSTR: 417 cmd |= COMMAND_RBSY_CHK; 418 break; 419 } 420 } 421 422 cmd |= COMMAND_GO | COMMAND_CE(ctrl->cur_cs); 423 writel_relaxed(cmd, ctrl->regs + COMMAND); 424 ret = wait_for_completion_timeout(&ctrl->command_complete, 425 msecs_to_jiffies(500)); 426 if (!ret) { 427 dev_err(ctrl->dev, "COMMAND timeout\n"); 428 tegra_nand_dump_reg(ctrl); 429 tegra_nand_controller_abort(ctrl); 430 return -ETIMEDOUT; 431 } 432 433 if (instr_data_in) { 434 reg = readl_relaxed(ctrl->regs + RESP); 435 memcpy(instr_data_in->ctx.data.buf.in + offset, ®, size); 436 } 437 438 return 0; 439 } 440 441 static const struct nand_op_parser tegra_nand_op_parser = NAND_OP_PARSER( 442 NAND_OP_PARSER_PATTERN(tegra_nand_cmd, 443 NAND_OP_PARSER_PAT_CMD_ELEM(true), 444 NAND_OP_PARSER_PAT_ADDR_ELEM(true, 8), 445 NAND_OP_PARSER_PAT_CMD_ELEM(true), 446 NAND_OP_PARSER_PAT_WAITRDY_ELEM(true)), 447 NAND_OP_PARSER_PATTERN(tegra_nand_cmd, 448 NAND_OP_PARSER_PAT_DATA_OUT_ELEM(false, 4)), 449 NAND_OP_PARSER_PATTERN(tegra_nand_cmd, 450 NAND_OP_PARSER_PAT_CMD_ELEM(true), 451 NAND_OP_PARSER_PAT_ADDR_ELEM(true, 8), 452 NAND_OP_PARSER_PAT_CMD_ELEM(true), 453 NAND_OP_PARSER_PAT_WAITRDY_ELEM(true), 454 NAND_OP_PARSER_PAT_DATA_IN_ELEM(true, 4)), 455 ); 456 457 static void tegra_nand_select_target(struct nand_chip *chip, 458 unsigned int die_nr) 459 { 460 struct tegra_nand_chip *nand = to_tegra_chip(chip); 461 struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller); 462 463 ctrl->cur_cs = nand->cs[die_nr]; 464 } 465 466 static int tegra_nand_exec_op(struct nand_chip *chip, 467 const struct nand_operation *op, 468 bool check_only) 469 { 470 if (!check_only) 471 tegra_nand_select_target(chip, op->cs); 472 473 return nand_op_parser_exec_op(chip, &tegra_nand_op_parser, op, 474 check_only); 475 } 476 477 static void tegra_nand_hw_ecc(struct tegra_nand_controller *ctrl, 478 struct nand_chip *chip, bool enable) 479 { 480 struct tegra_nand_chip *nand = to_tegra_chip(chip); 481 482 if (chip->ecc.algo == NAND_ECC_BCH && enable) 483 writel_relaxed(nand->bch_config, ctrl->regs + BCH_CONFIG); 484 else 485 writel_relaxed(0, ctrl->regs + BCH_CONFIG); 486 487 if (enable) 488 writel_relaxed(nand->config_ecc, ctrl->regs + CONFIG); 489 else 490 writel_relaxed(nand->config, ctrl->regs + CONFIG); 491 } 492 493 static int tegra_nand_page_xfer(struct mtd_info *mtd, struct nand_chip *chip, 494 void *buf, void *oob_buf, int oob_len, int page, 495 bool read) 496 { 497 struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller); 498 enum dma_data_direction dir = read ? DMA_FROM_DEVICE : DMA_TO_DEVICE; 499 dma_addr_t dma_addr = 0, dma_addr_oob = 0; 500 u32 addr1, cmd, dma_ctrl; 501 int ret; 502 503 tegra_nand_select_target(chip, chip->cur_cs); 504 505 if (read) { 506 writel_relaxed(NAND_CMD_READ0, ctrl->regs + CMD_REG1); 507 writel_relaxed(NAND_CMD_READSTART, ctrl->regs + CMD_REG2); 508 } else { 509 writel_relaxed(NAND_CMD_SEQIN, ctrl->regs + CMD_REG1); 510 writel_relaxed(NAND_CMD_PAGEPROG, ctrl->regs + CMD_REG2); 511 } 512 cmd = COMMAND_CLE | COMMAND_SEC_CMD; 513 514 /* Lower 16-bits are column, by default 0 */ 515 addr1 = page << 16; 516 517 if (!buf) 518 addr1 |= mtd->writesize; 519 writel_relaxed(addr1, ctrl->regs + ADDR_REG1); 520 521 if (chip->options & NAND_ROW_ADDR_3) { 522 writel_relaxed(page >> 16, ctrl->regs + ADDR_REG2); 523 cmd |= COMMAND_ALE | COMMAND_ALE_SIZE(5); 524 } else { 525 cmd |= COMMAND_ALE | COMMAND_ALE_SIZE(4); 526 } 527 528 if (buf) { 529 dma_addr = dma_map_single(ctrl->dev, buf, mtd->writesize, dir); 530 ret = dma_mapping_error(ctrl->dev, dma_addr); 531 if (ret) { 532 dev_err(ctrl->dev, "dma mapping error\n"); 533 return -EINVAL; 534 } 535 536 writel_relaxed(mtd->writesize - 1, ctrl->regs + DMA_CFG_A); 537 writel_relaxed(dma_addr, ctrl->regs + DATA_PTR); 538 } 539 540 if (oob_buf) { 541 dma_addr_oob = dma_map_single(ctrl->dev, oob_buf, mtd->oobsize, 542 dir); 543 ret = dma_mapping_error(ctrl->dev, dma_addr_oob); 544 if (ret) { 545 dev_err(ctrl->dev, "dma mapping error\n"); 546 ret = -EINVAL; 547 goto err_unmap_dma_page; 548 } 549 550 writel_relaxed(oob_len - 1, ctrl->regs + DMA_CFG_B); 551 writel_relaxed(dma_addr_oob, ctrl->regs + TAG_PTR); 552 } 553 554 dma_ctrl = DMA_MST_CTRL_GO | DMA_MST_CTRL_PERF_EN | 555 DMA_MST_CTRL_IE_DONE | DMA_MST_CTRL_IS_DONE | 556 DMA_MST_CTRL_BURST_16; 557 558 if (buf) 559 dma_ctrl |= DMA_MST_CTRL_EN_A; 560 if (oob_buf) 561 dma_ctrl |= DMA_MST_CTRL_EN_B; 562 563 if (read) 564 dma_ctrl |= DMA_MST_CTRL_IN | DMA_MST_CTRL_REUSE; 565 else 566 dma_ctrl |= DMA_MST_CTRL_OUT; 567 568 writel_relaxed(dma_ctrl, ctrl->regs + DMA_MST_CTRL); 569 570 cmd |= COMMAND_GO | COMMAND_RBSY_CHK | COMMAND_TRANS_SIZE(9) | 571 COMMAND_CE(ctrl->cur_cs); 572 573 if (buf) 574 cmd |= COMMAND_A_VALID; 575 if (oob_buf) 576 cmd |= COMMAND_B_VALID; 577 578 if (read) 579 cmd |= COMMAND_RX; 580 else 581 cmd |= COMMAND_TX | COMMAND_AFT_DAT; 582 583 writel_relaxed(cmd, ctrl->regs + COMMAND); 584 585 ret = wait_for_completion_timeout(&ctrl->command_complete, 586 msecs_to_jiffies(500)); 587 if (!ret) { 588 dev_err(ctrl->dev, "COMMAND timeout\n"); 589 tegra_nand_dump_reg(ctrl); 590 tegra_nand_controller_abort(ctrl); 591 ret = -ETIMEDOUT; 592 goto err_unmap_dma; 593 } 594 595 ret = wait_for_completion_timeout(&ctrl->dma_complete, 596 msecs_to_jiffies(500)); 597 if (!ret) { 598 dev_err(ctrl->dev, "DMA timeout\n"); 599 tegra_nand_dump_reg(ctrl); 600 tegra_nand_controller_abort(ctrl); 601 ret = -ETIMEDOUT; 602 goto err_unmap_dma; 603 } 604 ret = 0; 605 606 err_unmap_dma: 607 if (oob_buf) 608 dma_unmap_single(ctrl->dev, dma_addr_oob, mtd->oobsize, dir); 609 err_unmap_dma_page: 610 if (buf) 611 dma_unmap_single(ctrl->dev, dma_addr, mtd->writesize, dir); 612 613 return ret; 614 } 615 616 static int tegra_nand_read_page_raw(struct nand_chip *chip, u8 *buf, 617 int oob_required, int page) 618 { 619 struct mtd_info *mtd = nand_to_mtd(chip); 620 void *oob_buf = oob_required ? chip->oob_poi : NULL; 621 622 return tegra_nand_page_xfer(mtd, chip, buf, oob_buf, 623 mtd->oobsize, page, true); 624 } 625 626 static int tegra_nand_write_page_raw(struct nand_chip *chip, const u8 *buf, 627 int oob_required, int page) 628 { 629 struct mtd_info *mtd = nand_to_mtd(chip); 630 void *oob_buf = oob_required ? chip->oob_poi : NULL; 631 632 return tegra_nand_page_xfer(mtd, chip, (void *)buf, oob_buf, 633 mtd->oobsize, page, false); 634 } 635 636 static int tegra_nand_read_oob(struct nand_chip *chip, int page) 637 { 638 struct mtd_info *mtd = nand_to_mtd(chip); 639 640 return tegra_nand_page_xfer(mtd, chip, NULL, chip->oob_poi, 641 mtd->oobsize, page, true); 642 } 643 644 static int tegra_nand_write_oob(struct nand_chip *chip, int page) 645 { 646 struct mtd_info *mtd = nand_to_mtd(chip); 647 648 return tegra_nand_page_xfer(mtd, chip, NULL, chip->oob_poi, 649 mtd->oobsize, page, false); 650 } 651 652 static int tegra_nand_read_page_hwecc(struct nand_chip *chip, u8 *buf, 653 int oob_required, int page) 654 { 655 struct mtd_info *mtd = nand_to_mtd(chip); 656 struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller); 657 struct tegra_nand_chip *nand = to_tegra_chip(chip); 658 void *oob_buf = oob_required ? chip->oob_poi : NULL; 659 u32 dec_stat, max_corr_cnt; 660 unsigned long fail_sec_flag; 661 int ret; 662 663 tegra_nand_hw_ecc(ctrl, chip, true); 664 ret = tegra_nand_page_xfer(mtd, chip, buf, oob_buf, 0, page, true); 665 tegra_nand_hw_ecc(ctrl, chip, false); 666 if (ret) 667 return ret; 668 669 /* No correctable or un-correctable errors, page must have 0 bitflips */ 670 if (!ctrl->last_read_error) 671 return 0; 672 673 /* 674 * Correctable or un-correctable errors occurred. Use DEC_STAT_BUF 675 * which contains information for all ECC selections. 676 * 677 * Note that since we do not use Command Queues DEC_RESULT does not 678 * state the number of pages we can read from the DEC_STAT_BUF. But 679 * since CORRFAIL_ERR did occur during page read we do have a valid 680 * result in DEC_STAT_BUF. 681 */ 682 ctrl->last_read_error = false; 683 dec_stat = readl_relaxed(ctrl->regs + DEC_STAT_BUF); 684 685 fail_sec_flag = (dec_stat & DEC_STAT_BUF_FAIL_SEC_FLAG_MASK) >> 686 DEC_STAT_BUF_FAIL_SEC_FLAG_SHIFT; 687 688 max_corr_cnt = (dec_stat & DEC_STAT_BUF_MAX_CORR_CNT_MASK) >> 689 DEC_STAT_BUF_MAX_CORR_CNT_SHIFT; 690 691 if (fail_sec_flag) { 692 int bit, max_bitflips = 0; 693 694 /* 695 * Since we do not support subpage writes, a complete page 696 * is either written or not. We can take a shortcut here by 697 * checking wheather any of the sector has been successful 698 * read. If at least one sectors has been read successfully, 699 * the page must have been a written previously. It cannot 700 * be an erased page. 701 * 702 * E.g. controller might return fail_sec_flag with 0x4, which 703 * would mean only the third sector failed to correct. The 704 * page must have been written and the third sector is really 705 * not correctable anymore. 706 */ 707 if (fail_sec_flag ^ GENMASK(chip->ecc.steps - 1, 0)) { 708 mtd->ecc_stats.failed += hweight8(fail_sec_flag); 709 return max_corr_cnt; 710 } 711 712 /* 713 * All sectors failed to correct, but the ECC isn't smart 714 * enough to figure out if a page is really just erased. 715 * Read OOB data and check whether data/OOB is completely 716 * erased or if error correction just failed for all sub- 717 * pages. 718 */ 719 ret = tegra_nand_read_oob(chip, page); 720 if (ret < 0) 721 return ret; 722 723 for_each_set_bit(bit, &fail_sec_flag, chip->ecc.steps) { 724 u8 *data = buf + (chip->ecc.size * bit); 725 u8 *oob = chip->oob_poi + nand->ecc.offset + 726 (chip->ecc.bytes * bit); 727 728 ret = nand_check_erased_ecc_chunk(data, chip->ecc.size, 729 oob, chip->ecc.bytes, 730 NULL, 0, 731 chip->ecc.strength); 732 if (ret < 0) { 733 mtd->ecc_stats.failed++; 734 } else { 735 mtd->ecc_stats.corrected += ret; 736 max_bitflips = max(ret, max_bitflips); 737 } 738 } 739 740 return max_t(unsigned int, max_corr_cnt, max_bitflips); 741 } else { 742 int corr_sec_flag; 743 744 corr_sec_flag = (dec_stat & DEC_STAT_BUF_CORR_SEC_FLAG_MASK) >> 745 DEC_STAT_BUF_CORR_SEC_FLAG_SHIFT; 746 747 /* 748 * The value returned in the register is the maximum of 749 * bitflips encountered in any of the ECC regions. As there is 750 * no way to get the number of bitflips in a specific regions 751 * we are not able to deliver correct stats but instead 752 * overestimate the number of corrected bitflips by assuming 753 * that all regions where errors have been corrected 754 * encountered the maximum number of bitflips. 755 */ 756 mtd->ecc_stats.corrected += max_corr_cnt * hweight8(corr_sec_flag); 757 758 return max_corr_cnt; 759 } 760 } 761 762 static int tegra_nand_write_page_hwecc(struct nand_chip *chip, const u8 *buf, 763 int oob_required, int page) 764 { 765 struct mtd_info *mtd = nand_to_mtd(chip); 766 struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller); 767 void *oob_buf = oob_required ? chip->oob_poi : NULL; 768 int ret; 769 770 tegra_nand_hw_ecc(ctrl, chip, true); 771 ret = tegra_nand_page_xfer(mtd, chip, (void *)buf, oob_buf, 772 0, page, false); 773 tegra_nand_hw_ecc(ctrl, chip, false); 774 775 return ret; 776 } 777 778 static void tegra_nand_setup_timing(struct tegra_nand_controller *ctrl, 779 const struct nand_sdr_timings *timings) 780 { 781 /* 782 * The period (and all other timings in this function) is in ps, 783 * so need to take care here to avoid integer overflows. 784 */ 785 unsigned int rate = clk_get_rate(ctrl->clk) / 1000000; 786 unsigned int period = DIV_ROUND_UP(1000000, rate); 787 u32 val, reg = 0; 788 789 val = DIV_ROUND_UP(max3(timings->tAR_min, timings->tRR_min, 790 timings->tRC_min), period); 791 reg |= TIMING_TCR_TAR_TRR(OFFSET(val, 3)); 792 793 val = DIV_ROUND_UP(max(max(timings->tCS_min, timings->tCH_min), 794 max(timings->tALS_min, timings->tALH_min)), 795 period); 796 reg |= TIMING_TCS(OFFSET(val, 2)); 797 798 val = DIV_ROUND_UP(max(timings->tRP_min, timings->tREA_max) + 6000, 799 period); 800 reg |= TIMING_TRP(OFFSET(val, 1)) | TIMING_TRP_RESP(OFFSET(val, 1)); 801 802 reg |= TIMING_TWB(OFFSET(DIV_ROUND_UP(timings->tWB_max, period), 1)); 803 reg |= TIMING_TWHR(OFFSET(DIV_ROUND_UP(timings->tWHR_min, period), 1)); 804 reg |= TIMING_TWH(OFFSET(DIV_ROUND_UP(timings->tWH_min, period), 1)); 805 reg |= TIMING_TWP(OFFSET(DIV_ROUND_UP(timings->tWP_min, period), 1)); 806 reg |= TIMING_TRH(OFFSET(DIV_ROUND_UP(timings->tREH_min, period), 1)); 807 808 writel_relaxed(reg, ctrl->regs + TIMING_1); 809 810 val = DIV_ROUND_UP(timings->tADL_min, period); 811 reg = TIMING_TADL(OFFSET(val, 3)); 812 813 writel_relaxed(reg, ctrl->regs + TIMING_2); 814 } 815 816 static int tegra_nand_setup_data_interface(struct nand_chip *chip, int csline, 817 const struct nand_data_interface *conf) 818 { 819 struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller); 820 const struct nand_sdr_timings *timings; 821 822 timings = nand_get_sdr_timings(conf); 823 if (IS_ERR(timings)) 824 return PTR_ERR(timings); 825 826 if (csline == NAND_DATA_IFACE_CHECK_ONLY) 827 return 0; 828 829 tegra_nand_setup_timing(ctrl, timings); 830 831 return 0; 832 } 833 834 static const int rs_strength_bootable[] = { 4 }; 835 static const int rs_strength[] = { 4, 6, 8 }; 836 static const int bch_strength_bootable[] = { 8, 16 }; 837 static const int bch_strength[] = { 4, 8, 14, 16 }; 838 839 static int tegra_nand_get_strength(struct nand_chip *chip, const int *strength, 840 int strength_len, int bits_per_step, 841 int oobsize) 842 { 843 bool maximize = chip->ecc.options & NAND_ECC_MAXIMIZE; 844 int i; 845 846 /* 847 * Loop through available strengths. Backwards in case we try to 848 * maximize the BCH strength. 849 */ 850 for (i = 0; i < strength_len; i++) { 851 int strength_sel, bytes_per_step, bytes_per_page; 852 853 if (maximize) { 854 strength_sel = strength[strength_len - i - 1]; 855 } else { 856 strength_sel = strength[i]; 857 858 if (strength_sel < chip->base.eccreq.strength) 859 continue; 860 } 861 862 bytes_per_step = DIV_ROUND_UP(bits_per_step * strength_sel, 863 BITS_PER_BYTE); 864 bytes_per_page = round_up(bytes_per_step * chip->ecc.steps, 4); 865 866 /* Check whether strength fits OOB */ 867 if (bytes_per_page < (oobsize - SKIP_SPARE_BYTES)) 868 return strength_sel; 869 } 870 871 return -EINVAL; 872 } 873 874 static int tegra_nand_select_strength(struct nand_chip *chip, int oobsize) 875 { 876 const int *strength; 877 int strength_len, bits_per_step; 878 879 switch (chip->ecc.algo) { 880 case NAND_ECC_RS: 881 bits_per_step = BITS_PER_STEP_RS; 882 if (chip->options & NAND_IS_BOOT_MEDIUM) { 883 strength = rs_strength_bootable; 884 strength_len = ARRAY_SIZE(rs_strength_bootable); 885 } else { 886 strength = rs_strength; 887 strength_len = ARRAY_SIZE(rs_strength); 888 } 889 break; 890 case NAND_ECC_BCH: 891 bits_per_step = BITS_PER_STEP_BCH; 892 if (chip->options & NAND_IS_BOOT_MEDIUM) { 893 strength = bch_strength_bootable; 894 strength_len = ARRAY_SIZE(bch_strength_bootable); 895 } else { 896 strength = bch_strength; 897 strength_len = ARRAY_SIZE(bch_strength); 898 } 899 break; 900 default: 901 return -EINVAL; 902 } 903 904 return tegra_nand_get_strength(chip, strength, strength_len, 905 bits_per_step, oobsize); 906 } 907 908 static int tegra_nand_attach_chip(struct nand_chip *chip) 909 { 910 struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller); 911 struct tegra_nand_chip *nand = to_tegra_chip(chip); 912 struct mtd_info *mtd = nand_to_mtd(chip); 913 int bits_per_step; 914 int ret; 915 916 if (chip->bbt_options & NAND_BBT_USE_FLASH) 917 chip->bbt_options |= NAND_BBT_NO_OOB; 918 919 chip->ecc.mode = NAND_ECC_HW; 920 chip->ecc.size = 512; 921 chip->ecc.steps = mtd->writesize / chip->ecc.size; 922 if (chip->base.eccreq.step_size != 512) { 923 dev_err(ctrl->dev, "Unsupported step size %d\n", 924 chip->base.eccreq.step_size); 925 return -EINVAL; 926 } 927 928 chip->ecc.read_page = tegra_nand_read_page_hwecc; 929 chip->ecc.write_page = tegra_nand_write_page_hwecc; 930 chip->ecc.read_page_raw = tegra_nand_read_page_raw; 931 chip->ecc.write_page_raw = tegra_nand_write_page_raw; 932 chip->ecc.read_oob = tegra_nand_read_oob; 933 chip->ecc.write_oob = tegra_nand_write_oob; 934 935 if (chip->options & NAND_BUSWIDTH_16) 936 nand->config |= CONFIG_BUS_WIDTH_16; 937 938 if (chip->ecc.algo == NAND_ECC_UNKNOWN) { 939 if (mtd->writesize < 2048) 940 chip->ecc.algo = NAND_ECC_RS; 941 else 942 chip->ecc.algo = NAND_ECC_BCH; 943 } 944 945 if (chip->ecc.algo == NAND_ECC_BCH && mtd->writesize < 2048) { 946 dev_err(ctrl->dev, "BCH supports 2K or 4K page size only\n"); 947 return -EINVAL; 948 } 949 950 if (!chip->ecc.strength) { 951 ret = tegra_nand_select_strength(chip, mtd->oobsize); 952 if (ret < 0) { 953 dev_err(ctrl->dev, 954 "No valid strength found, minimum %d\n", 955 chip->base.eccreq.strength); 956 return ret; 957 } 958 959 chip->ecc.strength = ret; 960 } 961 962 nand->config_ecc = CONFIG_PIPE_EN | CONFIG_SKIP_SPARE | 963 CONFIG_SKIP_SPARE_SIZE_4; 964 965 switch (chip->ecc.algo) { 966 case NAND_ECC_RS: 967 bits_per_step = BITS_PER_STEP_RS * chip->ecc.strength; 968 mtd_set_ooblayout(mtd, &tegra_nand_oob_rs_ops); 969 nand->config_ecc |= CONFIG_HW_ECC | CONFIG_ECC_SEL | 970 CONFIG_ERR_COR; 971 switch (chip->ecc.strength) { 972 case 4: 973 nand->config_ecc |= CONFIG_TVAL_4; 974 break; 975 case 6: 976 nand->config_ecc |= CONFIG_TVAL_6; 977 break; 978 case 8: 979 nand->config_ecc |= CONFIG_TVAL_8; 980 break; 981 default: 982 dev_err(ctrl->dev, "ECC strength %d not supported\n", 983 chip->ecc.strength); 984 return -EINVAL; 985 } 986 break; 987 case NAND_ECC_BCH: 988 bits_per_step = BITS_PER_STEP_BCH * chip->ecc.strength; 989 mtd_set_ooblayout(mtd, &tegra_nand_oob_bch_ops); 990 nand->bch_config = BCH_ENABLE; 991 switch (chip->ecc.strength) { 992 case 4: 993 nand->bch_config |= BCH_TVAL_4; 994 break; 995 case 8: 996 nand->bch_config |= BCH_TVAL_8; 997 break; 998 case 14: 999 nand->bch_config |= BCH_TVAL_14; 1000 break; 1001 case 16: 1002 nand->bch_config |= BCH_TVAL_16; 1003 break; 1004 default: 1005 dev_err(ctrl->dev, "ECC strength %d not supported\n", 1006 chip->ecc.strength); 1007 return -EINVAL; 1008 } 1009 break; 1010 default: 1011 dev_err(ctrl->dev, "ECC algorithm not supported\n"); 1012 return -EINVAL; 1013 } 1014 1015 dev_info(ctrl->dev, "Using %s with strength %d per 512 byte step\n", 1016 chip->ecc.algo == NAND_ECC_BCH ? "BCH" : "RS", 1017 chip->ecc.strength); 1018 1019 chip->ecc.bytes = DIV_ROUND_UP(bits_per_step, BITS_PER_BYTE); 1020 1021 switch (mtd->writesize) { 1022 case 256: 1023 nand->config |= CONFIG_PS_256; 1024 break; 1025 case 512: 1026 nand->config |= CONFIG_PS_512; 1027 break; 1028 case 1024: 1029 nand->config |= CONFIG_PS_1024; 1030 break; 1031 case 2048: 1032 nand->config |= CONFIG_PS_2048; 1033 break; 1034 case 4096: 1035 nand->config |= CONFIG_PS_4096; 1036 break; 1037 default: 1038 dev_err(ctrl->dev, "Unsupported writesize %d\n", 1039 mtd->writesize); 1040 return -ENODEV; 1041 } 1042 1043 /* Store complete configuration for HW ECC in config_ecc */ 1044 nand->config_ecc |= nand->config; 1045 1046 /* Non-HW ECC read/writes complete OOB */ 1047 nand->config |= CONFIG_TAG_BYTE_SIZE(mtd->oobsize - 1); 1048 writel_relaxed(nand->config, ctrl->regs + CONFIG); 1049 1050 return 0; 1051 } 1052 1053 static const struct nand_controller_ops tegra_nand_controller_ops = { 1054 .attach_chip = &tegra_nand_attach_chip, 1055 .exec_op = tegra_nand_exec_op, 1056 .setup_data_interface = tegra_nand_setup_data_interface, 1057 }; 1058 1059 static int tegra_nand_chips_init(struct device *dev, 1060 struct tegra_nand_controller *ctrl) 1061 { 1062 struct device_node *np = dev->of_node; 1063 struct device_node *np_nand; 1064 int nsels, nchips = of_get_child_count(np); 1065 struct tegra_nand_chip *nand; 1066 struct mtd_info *mtd; 1067 struct nand_chip *chip; 1068 int ret; 1069 u32 cs; 1070 1071 if (nchips != 1) { 1072 dev_err(dev, "Currently only one NAND chip supported\n"); 1073 return -EINVAL; 1074 } 1075 1076 np_nand = of_get_next_child(np, NULL); 1077 1078 nsels = of_property_count_elems_of_size(np_nand, "reg", sizeof(u32)); 1079 if (nsels != 1) { 1080 dev_err(dev, "Missing/invalid reg property\n"); 1081 return -EINVAL; 1082 } 1083 1084 /* Retrieve CS id, currently only single die NAND supported */ 1085 ret = of_property_read_u32(np_nand, "reg", &cs); 1086 if (ret) { 1087 dev_err(dev, "could not retrieve reg property: %d\n", ret); 1088 return ret; 1089 } 1090 1091 nand = devm_kzalloc(dev, sizeof(*nand), GFP_KERNEL); 1092 if (!nand) 1093 return -ENOMEM; 1094 1095 nand->cs[0] = cs; 1096 1097 nand->wp_gpio = devm_gpiod_get_optional(dev, "wp", GPIOD_OUT_LOW); 1098 1099 if (IS_ERR(nand->wp_gpio)) { 1100 ret = PTR_ERR(nand->wp_gpio); 1101 dev_err(dev, "Failed to request WP GPIO: %d\n", ret); 1102 return ret; 1103 } 1104 1105 chip = &nand->chip; 1106 chip->controller = &ctrl->controller; 1107 1108 mtd = nand_to_mtd(chip); 1109 1110 mtd->dev.parent = dev; 1111 mtd->owner = THIS_MODULE; 1112 1113 nand_set_flash_node(chip, np_nand); 1114 1115 if (!mtd->name) 1116 mtd->name = "tegra_nand"; 1117 1118 chip->options = NAND_NO_SUBPAGE_WRITE | NAND_USES_DMA; 1119 1120 ret = nand_scan(chip, 1); 1121 if (ret) 1122 return ret; 1123 1124 mtd_ooblayout_ecc(mtd, 0, &nand->ecc); 1125 1126 ret = mtd_device_register(mtd, NULL, 0); 1127 if (ret) { 1128 dev_err(dev, "Failed to register mtd device: %d\n", ret); 1129 nand_cleanup(chip); 1130 return ret; 1131 } 1132 1133 ctrl->chip = chip; 1134 1135 return 0; 1136 } 1137 1138 static int tegra_nand_probe(struct platform_device *pdev) 1139 { 1140 struct reset_control *rst; 1141 struct tegra_nand_controller *ctrl; 1142 struct resource *res; 1143 int err = 0; 1144 1145 ctrl = devm_kzalloc(&pdev->dev, sizeof(*ctrl), GFP_KERNEL); 1146 if (!ctrl) 1147 return -ENOMEM; 1148 1149 ctrl->dev = &pdev->dev; 1150 nand_controller_init(&ctrl->controller); 1151 ctrl->controller.ops = &tegra_nand_controller_ops; 1152 1153 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1154 ctrl->regs = devm_ioremap_resource(&pdev->dev, res); 1155 if (IS_ERR(ctrl->regs)) 1156 return PTR_ERR(ctrl->regs); 1157 1158 rst = devm_reset_control_get(&pdev->dev, "nand"); 1159 if (IS_ERR(rst)) 1160 return PTR_ERR(rst); 1161 1162 ctrl->clk = devm_clk_get(&pdev->dev, "nand"); 1163 if (IS_ERR(ctrl->clk)) 1164 return PTR_ERR(ctrl->clk); 1165 1166 err = clk_prepare_enable(ctrl->clk); 1167 if (err) 1168 return err; 1169 1170 err = reset_control_reset(rst); 1171 if (err) { 1172 dev_err(ctrl->dev, "Failed to reset HW: %d\n", err); 1173 goto err_disable_clk; 1174 } 1175 1176 writel_relaxed(HWSTATUS_CMD_DEFAULT, ctrl->regs + HWSTATUS_CMD); 1177 writel_relaxed(HWSTATUS_MASK_DEFAULT, ctrl->regs + HWSTATUS_MASK); 1178 writel_relaxed(INT_MASK, ctrl->regs + IER); 1179 1180 init_completion(&ctrl->command_complete); 1181 init_completion(&ctrl->dma_complete); 1182 1183 ctrl->irq = platform_get_irq(pdev, 0); 1184 err = devm_request_irq(&pdev->dev, ctrl->irq, tegra_nand_irq, 0, 1185 dev_name(&pdev->dev), ctrl); 1186 if (err) { 1187 dev_err(ctrl->dev, "Failed to get IRQ: %d\n", err); 1188 goto err_disable_clk; 1189 } 1190 1191 writel_relaxed(DMA_MST_CTRL_IS_DONE, ctrl->regs + DMA_MST_CTRL); 1192 1193 err = tegra_nand_chips_init(ctrl->dev, ctrl); 1194 if (err) 1195 goto err_disable_clk; 1196 1197 platform_set_drvdata(pdev, ctrl); 1198 1199 return 0; 1200 1201 err_disable_clk: 1202 clk_disable_unprepare(ctrl->clk); 1203 return err; 1204 } 1205 1206 static int tegra_nand_remove(struct platform_device *pdev) 1207 { 1208 struct tegra_nand_controller *ctrl = platform_get_drvdata(pdev); 1209 struct nand_chip *chip = ctrl->chip; 1210 struct mtd_info *mtd = nand_to_mtd(chip); 1211 int ret; 1212 1213 ret = mtd_device_unregister(mtd); 1214 if (ret) 1215 return ret; 1216 1217 nand_cleanup(chip); 1218 1219 clk_disable_unprepare(ctrl->clk); 1220 1221 return 0; 1222 } 1223 1224 static const struct of_device_id tegra_nand_of_match[] = { 1225 { .compatible = "nvidia,tegra20-nand" }, 1226 { /* sentinel */ } 1227 }; 1228 MODULE_DEVICE_TABLE(of, tegra_nand_of_match); 1229 1230 static struct platform_driver tegra_nand_driver = { 1231 .driver = { 1232 .name = "tegra-nand", 1233 .of_match_table = tegra_nand_of_match, 1234 }, 1235 .probe = tegra_nand_probe, 1236 .remove = tegra_nand_remove, 1237 }; 1238 module_platform_driver(tegra_nand_driver); 1239 1240 MODULE_DESCRIPTION("NVIDIA Tegra NAND driver"); 1241 MODULE_AUTHOR("Thierry Reding <thierry.reding@nvidia.com>"); 1242 MODULE_AUTHOR("Lucas Stach <dev@lynxeye.de>"); 1243 MODULE_AUTHOR("Stefan Agner <stefan@agner.ch>"); 1244 MODULE_LICENSE("GPL v2"); 1245