1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Samsung S3C64XX/S5PC1XX OneNAND driver 4 * 5 * Copyright © 2008-2010 Samsung Electronics 6 * Kyungmin Park <kyungmin.park@samsung.com> 7 * Marek Szyprowski <m.szyprowski@samsung.com> 8 * 9 * Implementation: 10 * S3C64XX: emulate the pseudo BufferRAM 11 * S5PC110: use DMA 12 */ 13 14 #include <linux/module.h> 15 #include <linux/platform_device.h> 16 #include <linux/sched.h> 17 #include <linux/slab.h> 18 #include <linux/mtd/mtd.h> 19 #include <linux/mtd/onenand.h> 20 #include <linux/mtd/partitions.h> 21 #include <linux/dma-mapping.h> 22 #include <linux/interrupt.h> 23 #include <linux/io.h> 24 25 #include "samsung.h" 26 27 enum soc_type { 28 TYPE_S3C6400, 29 TYPE_S3C6410, 30 TYPE_S5PC110, 31 }; 32 33 #define ONENAND_ERASE_STATUS 0x00 34 #define ONENAND_MULTI_ERASE_SET 0x01 35 #define ONENAND_ERASE_START 0x03 36 #define ONENAND_UNLOCK_START 0x08 37 #define ONENAND_UNLOCK_END 0x09 38 #define ONENAND_LOCK_START 0x0A 39 #define ONENAND_LOCK_END 0x0B 40 #define ONENAND_LOCK_TIGHT_START 0x0C 41 #define ONENAND_LOCK_TIGHT_END 0x0D 42 #define ONENAND_UNLOCK_ALL 0x0E 43 #define ONENAND_OTP_ACCESS 0x12 44 #define ONENAND_SPARE_ACCESS_ONLY 0x13 45 #define ONENAND_MAIN_ACCESS_ONLY 0x14 46 #define ONENAND_ERASE_VERIFY 0x15 47 #define ONENAND_MAIN_SPARE_ACCESS 0x16 48 #define ONENAND_PIPELINE_READ 0x4000 49 50 #define MAP_00 (0x0) 51 #define MAP_01 (0x1) 52 #define MAP_10 (0x2) 53 #define MAP_11 (0x3) 54 55 #define S3C64XX_CMD_MAP_SHIFT 24 56 57 #define S3C6400_FBA_SHIFT 10 58 #define S3C6400_FPA_SHIFT 4 59 #define S3C6400_FSA_SHIFT 2 60 61 #define S3C6410_FBA_SHIFT 12 62 #define S3C6410_FPA_SHIFT 6 63 #define S3C6410_FSA_SHIFT 4 64 65 /* S5PC110 specific definitions */ 66 #define S5PC110_DMA_SRC_ADDR 0x400 67 #define S5PC110_DMA_SRC_CFG 0x404 68 #define S5PC110_DMA_DST_ADDR 0x408 69 #define S5PC110_DMA_DST_CFG 0x40C 70 #define S5PC110_DMA_TRANS_SIZE 0x414 71 #define S5PC110_DMA_TRANS_CMD 0x418 72 #define S5PC110_DMA_TRANS_STATUS 0x41C 73 #define S5PC110_DMA_TRANS_DIR 0x420 74 #define S5PC110_INTC_DMA_CLR 0x1004 75 #define S5PC110_INTC_ONENAND_CLR 0x1008 76 #define S5PC110_INTC_DMA_MASK 0x1024 77 #define S5PC110_INTC_ONENAND_MASK 0x1028 78 #define S5PC110_INTC_DMA_PEND 0x1044 79 #define S5PC110_INTC_ONENAND_PEND 0x1048 80 #define S5PC110_INTC_DMA_STATUS 0x1064 81 #define S5PC110_INTC_ONENAND_STATUS 0x1068 82 83 #define S5PC110_INTC_DMA_TD (1 << 24) 84 #define S5PC110_INTC_DMA_TE (1 << 16) 85 86 #define S5PC110_DMA_CFG_SINGLE (0x0 << 16) 87 #define S5PC110_DMA_CFG_4BURST (0x2 << 16) 88 #define S5PC110_DMA_CFG_8BURST (0x3 << 16) 89 #define S5PC110_DMA_CFG_16BURST (0x4 << 16) 90 91 #define S5PC110_DMA_CFG_INC (0x0 << 8) 92 #define S5PC110_DMA_CFG_CNT (0x1 << 8) 93 94 #define S5PC110_DMA_CFG_8BIT (0x0 << 0) 95 #define S5PC110_DMA_CFG_16BIT (0x1 << 0) 96 #define S5PC110_DMA_CFG_32BIT (0x2 << 0) 97 98 #define S5PC110_DMA_SRC_CFG_READ (S5PC110_DMA_CFG_16BURST | \ 99 S5PC110_DMA_CFG_INC | \ 100 S5PC110_DMA_CFG_16BIT) 101 #define S5PC110_DMA_DST_CFG_READ (S5PC110_DMA_CFG_16BURST | \ 102 S5PC110_DMA_CFG_INC | \ 103 S5PC110_DMA_CFG_32BIT) 104 #define S5PC110_DMA_SRC_CFG_WRITE (S5PC110_DMA_CFG_16BURST | \ 105 S5PC110_DMA_CFG_INC | \ 106 S5PC110_DMA_CFG_32BIT) 107 #define S5PC110_DMA_DST_CFG_WRITE (S5PC110_DMA_CFG_16BURST | \ 108 S5PC110_DMA_CFG_INC | \ 109 S5PC110_DMA_CFG_16BIT) 110 111 #define S5PC110_DMA_TRANS_CMD_TDC (0x1 << 18) 112 #define S5PC110_DMA_TRANS_CMD_TEC (0x1 << 16) 113 #define S5PC110_DMA_TRANS_CMD_TR (0x1 << 0) 114 115 #define S5PC110_DMA_TRANS_STATUS_TD (0x1 << 18) 116 #define S5PC110_DMA_TRANS_STATUS_TB (0x1 << 17) 117 #define S5PC110_DMA_TRANS_STATUS_TE (0x1 << 16) 118 119 #define S5PC110_DMA_DIR_READ 0x0 120 #define S5PC110_DMA_DIR_WRITE 0x1 121 122 struct s3c_onenand { 123 struct mtd_info *mtd; 124 struct platform_device *pdev; 125 enum soc_type type; 126 void __iomem *base; 127 void __iomem *ahb_addr; 128 int bootram_command; 129 void *page_buf; 130 void *oob_buf; 131 unsigned int (*mem_addr)(int fba, int fpa, int fsa); 132 unsigned int (*cmd_map)(unsigned int type, unsigned int val); 133 void __iomem *dma_addr; 134 unsigned long phys_base; 135 struct completion complete; 136 }; 137 138 #define CMD_MAP_00(dev, addr) (dev->cmd_map(MAP_00, ((addr) << 1))) 139 #define CMD_MAP_01(dev, mem_addr) (dev->cmd_map(MAP_01, (mem_addr))) 140 #define CMD_MAP_10(dev, mem_addr) (dev->cmd_map(MAP_10, (mem_addr))) 141 #define CMD_MAP_11(dev, addr) (dev->cmd_map(MAP_11, ((addr) << 2))) 142 143 static struct s3c_onenand *onenand; 144 145 static inline int s3c_read_reg(int offset) 146 { 147 return readl(onenand->base + offset); 148 } 149 150 static inline void s3c_write_reg(int value, int offset) 151 { 152 writel(value, onenand->base + offset); 153 } 154 155 static inline int s3c_read_cmd(unsigned int cmd) 156 { 157 return readl(onenand->ahb_addr + cmd); 158 } 159 160 static inline void s3c_write_cmd(int value, unsigned int cmd) 161 { 162 writel(value, onenand->ahb_addr + cmd); 163 } 164 165 #ifdef SAMSUNG_DEBUG 166 static void s3c_dump_reg(void) 167 { 168 int i; 169 170 for (i = 0; i < 0x400; i += 0x40) { 171 printk(KERN_INFO "0x%08X: 0x%08x 0x%08x 0x%08x 0x%08x\n", 172 (unsigned int) onenand->base + i, 173 s3c_read_reg(i), s3c_read_reg(i + 0x10), 174 s3c_read_reg(i + 0x20), s3c_read_reg(i + 0x30)); 175 } 176 } 177 #endif 178 179 static unsigned int s3c64xx_cmd_map(unsigned type, unsigned val) 180 { 181 return (type << S3C64XX_CMD_MAP_SHIFT) | val; 182 } 183 184 static unsigned int s3c6400_mem_addr(int fba, int fpa, int fsa) 185 { 186 return (fba << S3C6400_FBA_SHIFT) | (fpa << S3C6400_FPA_SHIFT) | 187 (fsa << S3C6400_FSA_SHIFT); 188 } 189 190 static unsigned int s3c6410_mem_addr(int fba, int fpa, int fsa) 191 { 192 return (fba << S3C6410_FBA_SHIFT) | (fpa << S3C6410_FPA_SHIFT) | 193 (fsa << S3C6410_FSA_SHIFT); 194 } 195 196 static void s3c_onenand_reset(void) 197 { 198 unsigned long timeout = 0x10000; 199 int stat; 200 201 s3c_write_reg(ONENAND_MEM_RESET_COLD, MEM_RESET_OFFSET); 202 while (1 && timeout--) { 203 stat = s3c_read_reg(INT_ERR_STAT_OFFSET); 204 if (stat & RST_CMP) 205 break; 206 } 207 stat = s3c_read_reg(INT_ERR_STAT_OFFSET); 208 s3c_write_reg(stat, INT_ERR_ACK_OFFSET); 209 210 /* Clear interrupt */ 211 s3c_write_reg(0x0, INT_ERR_ACK_OFFSET); 212 /* Clear the ECC status */ 213 s3c_write_reg(0x0, ECC_ERR_STAT_OFFSET); 214 } 215 216 static unsigned short s3c_onenand_readw(void __iomem *addr) 217 { 218 struct onenand_chip *this = onenand->mtd->priv; 219 struct device *dev = &onenand->pdev->dev; 220 int reg = addr - this->base; 221 int word_addr = reg >> 1; 222 int value; 223 224 /* It's used for probing time */ 225 switch (reg) { 226 case ONENAND_REG_MANUFACTURER_ID: 227 return s3c_read_reg(MANUFACT_ID_OFFSET); 228 case ONENAND_REG_DEVICE_ID: 229 return s3c_read_reg(DEVICE_ID_OFFSET); 230 case ONENAND_REG_VERSION_ID: 231 return s3c_read_reg(FLASH_VER_ID_OFFSET); 232 case ONENAND_REG_DATA_BUFFER_SIZE: 233 return s3c_read_reg(DATA_BUF_SIZE_OFFSET); 234 case ONENAND_REG_TECHNOLOGY: 235 return s3c_read_reg(TECH_OFFSET); 236 case ONENAND_REG_SYS_CFG1: 237 return s3c_read_reg(MEM_CFG_OFFSET); 238 239 /* Used at unlock all status */ 240 case ONENAND_REG_CTRL_STATUS: 241 return 0; 242 243 case ONENAND_REG_WP_STATUS: 244 return ONENAND_WP_US; 245 246 default: 247 break; 248 } 249 250 /* BootRAM access control */ 251 if ((unsigned long)addr < ONENAND_DATARAM && onenand->bootram_command) { 252 if (word_addr == 0) 253 return s3c_read_reg(MANUFACT_ID_OFFSET); 254 if (word_addr == 1) 255 return s3c_read_reg(DEVICE_ID_OFFSET); 256 if (word_addr == 2) 257 return s3c_read_reg(FLASH_VER_ID_OFFSET); 258 } 259 260 value = s3c_read_cmd(CMD_MAP_11(onenand, word_addr)) & 0xffff; 261 dev_info(dev, "%s: Illegal access at reg 0x%x, value 0x%x\n", __func__, 262 word_addr, value); 263 return value; 264 } 265 266 static void s3c_onenand_writew(unsigned short value, void __iomem *addr) 267 { 268 struct onenand_chip *this = onenand->mtd->priv; 269 struct device *dev = &onenand->pdev->dev; 270 unsigned int reg = addr - this->base; 271 unsigned int word_addr = reg >> 1; 272 273 /* It's used for probing time */ 274 switch (reg) { 275 case ONENAND_REG_SYS_CFG1: 276 s3c_write_reg(value, MEM_CFG_OFFSET); 277 return; 278 279 case ONENAND_REG_START_ADDRESS1: 280 case ONENAND_REG_START_ADDRESS2: 281 return; 282 283 /* Lock/lock-tight/unlock/unlock_all */ 284 case ONENAND_REG_START_BLOCK_ADDRESS: 285 return; 286 287 default: 288 break; 289 } 290 291 /* BootRAM access control */ 292 if ((unsigned long)addr < ONENAND_DATARAM) { 293 if (value == ONENAND_CMD_READID) { 294 onenand->bootram_command = 1; 295 return; 296 } 297 if (value == ONENAND_CMD_RESET) { 298 s3c_write_reg(ONENAND_MEM_RESET_COLD, MEM_RESET_OFFSET); 299 onenand->bootram_command = 0; 300 return; 301 } 302 } 303 304 dev_info(dev, "%s: Illegal access at reg 0x%x, value 0x%x\n", __func__, 305 word_addr, value); 306 307 s3c_write_cmd(value, CMD_MAP_11(onenand, word_addr)); 308 } 309 310 static int s3c_onenand_wait(struct mtd_info *mtd, int state) 311 { 312 struct device *dev = &onenand->pdev->dev; 313 unsigned int flags = INT_ACT; 314 unsigned int stat, ecc; 315 unsigned long timeout; 316 317 switch (state) { 318 case FL_READING: 319 flags |= BLK_RW_CMP | LOAD_CMP; 320 break; 321 case FL_WRITING: 322 flags |= BLK_RW_CMP | PGM_CMP; 323 break; 324 case FL_ERASING: 325 flags |= BLK_RW_CMP | ERS_CMP; 326 break; 327 case FL_LOCKING: 328 flags |= BLK_RW_CMP; 329 break; 330 default: 331 break; 332 } 333 334 /* The 20 msec is enough */ 335 timeout = jiffies + msecs_to_jiffies(20); 336 while (time_before(jiffies, timeout)) { 337 stat = s3c_read_reg(INT_ERR_STAT_OFFSET); 338 if (stat & flags) 339 break; 340 341 if (state != FL_READING) 342 cond_resched(); 343 } 344 /* To get correct interrupt status in timeout case */ 345 stat = s3c_read_reg(INT_ERR_STAT_OFFSET); 346 s3c_write_reg(stat, INT_ERR_ACK_OFFSET); 347 348 /* 349 * In the Spec. it checks the controller status first 350 * However if you get the correct information in case of 351 * power off recovery (POR) test, it should read ECC status first 352 */ 353 if (stat & LOAD_CMP) { 354 ecc = s3c_read_reg(ECC_ERR_STAT_OFFSET); 355 if (ecc & ONENAND_ECC_4BIT_UNCORRECTABLE) { 356 dev_info(dev, "%s: ECC error = 0x%04x\n", __func__, 357 ecc); 358 mtd->ecc_stats.failed++; 359 return -EBADMSG; 360 } 361 } 362 363 if (stat & (LOCKED_BLK | ERS_FAIL | PGM_FAIL | LD_FAIL_ECC_ERR)) { 364 dev_info(dev, "%s: controller error = 0x%04x\n", __func__, 365 stat); 366 if (stat & LOCKED_BLK) 367 dev_info(dev, "%s: it's locked error = 0x%04x\n", 368 __func__, stat); 369 370 return -EIO; 371 } 372 373 return 0; 374 } 375 376 static int s3c_onenand_command(struct mtd_info *mtd, int cmd, loff_t addr, 377 size_t len) 378 { 379 struct onenand_chip *this = mtd->priv; 380 unsigned int *m, *s; 381 int fba, fpa, fsa = 0; 382 unsigned int mem_addr, cmd_map_01, cmd_map_10; 383 int i, mcount, scount; 384 int index; 385 386 fba = (int) (addr >> this->erase_shift); 387 fpa = (int) (addr >> this->page_shift); 388 fpa &= this->page_mask; 389 390 mem_addr = onenand->mem_addr(fba, fpa, fsa); 391 cmd_map_01 = CMD_MAP_01(onenand, mem_addr); 392 cmd_map_10 = CMD_MAP_10(onenand, mem_addr); 393 394 switch (cmd) { 395 case ONENAND_CMD_READ: 396 case ONENAND_CMD_READOOB: 397 case ONENAND_CMD_BUFFERRAM: 398 ONENAND_SET_NEXT_BUFFERRAM(this); 399 break; 400 default: 401 break; 402 } 403 404 index = ONENAND_CURRENT_BUFFERRAM(this); 405 406 /* 407 * Emulate Two BufferRAMs and access with 4 bytes pointer 408 */ 409 m = onenand->page_buf; 410 s = onenand->oob_buf; 411 412 if (index) { 413 m += (this->writesize >> 2); 414 s += (mtd->oobsize >> 2); 415 } 416 417 mcount = mtd->writesize >> 2; 418 scount = mtd->oobsize >> 2; 419 420 switch (cmd) { 421 case ONENAND_CMD_READ: 422 /* Main */ 423 for (i = 0; i < mcount; i++) 424 *m++ = s3c_read_cmd(cmd_map_01); 425 return 0; 426 427 case ONENAND_CMD_READOOB: 428 s3c_write_reg(TSRF, TRANS_SPARE_OFFSET); 429 /* Main */ 430 for (i = 0; i < mcount; i++) 431 *m++ = s3c_read_cmd(cmd_map_01); 432 433 /* Spare */ 434 for (i = 0; i < scount; i++) 435 *s++ = s3c_read_cmd(cmd_map_01); 436 437 s3c_write_reg(0, TRANS_SPARE_OFFSET); 438 return 0; 439 440 case ONENAND_CMD_PROG: 441 /* Main */ 442 for (i = 0; i < mcount; i++) 443 s3c_write_cmd(*m++, cmd_map_01); 444 return 0; 445 446 case ONENAND_CMD_PROGOOB: 447 s3c_write_reg(TSRF, TRANS_SPARE_OFFSET); 448 449 /* Main - dummy write */ 450 for (i = 0; i < mcount; i++) 451 s3c_write_cmd(0xffffffff, cmd_map_01); 452 453 /* Spare */ 454 for (i = 0; i < scount; i++) 455 s3c_write_cmd(*s++, cmd_map_01); 456 457 s3c_write_reg(0, TRANS_SPARE_OFFSET); 458 return 0; 459 460 case ONENAND_CMD_UNLOCK_ALL: 461 s3c_write_cmd(ONENAND_UNLOCK_ALL, cmd_map_10); 462 return 0; 463 464 case ONENAND_CMD_ERASE: 465 s3c_write_cmd(ONENAND_ERASE_START, cmd_map_10); 466 return 0; 467 468 default: 469 break; 470 } 471 472 return 0; 473 } 474 475 static unsigned char *s3c_get_bufferram(struct mtd_info *mtd, int area) 476 { 477 struct onenand_chip *this = mtd->priv; 478 int index = ONENAND_CURRENT_BUFFERRAM(this); 479 unsigned char *p; 480 481 if (area == ONENAND_DATARAM) { 482 p = onenand->page_buf; 483 if (index == 1) 484 p += this->writesize; 485 } else { 486 p = onenand->oob_buf; 487 if (index == 1) 488 p += mtd->oobsize; 489 } 490 491 return p; 492 } 493 494 static int onenand_read_bufferram(struct mtd_info *mtd, int area, 495 unsigned char *buffer, int offset, 496 size_t count) 497 { 498 unsigned char *p; 499 500 p = s3c_get_bufferram(mtd, area); 501 memcpy(buffer, p + offset, count); 502 return 0; 503 } 504 505 static int onenand_write_bufferram(struct mtd_info *mtd, int area, 506 const unsigned char *buffer, int offset, 507 size_t count) 508 { 509 unsigned char *p; 510 511 p = s3c_get_bufferram(mtd, area); 512 memcpy(p + offset, buffer, count); 513 return 0; 514 } 515 516 static int (*s5pc110_dma_ops)(dma_addr_t dst, dma_addr_t src, size_t count, int direction); 517 518 static int s5pc110_dma_poll(dma_addr_t dst, dma_addr_t src, size_t count, int direction) 519 { 520 void __iomem *base = onenand->dma_addr; 521 int status; 522 unsigned long timeout; 523 524 writel(src, base + S5PC110_DMA_SRC_ADDR); 525 writel(dst, base + S5PC110_DMA_DST_ADDR); 526 527 if (direction == S5PC110_DMA_DIR_READ) { 528 writel(S5PC110_DMA_SRC_CFG_READ, base + S5PC110_DMA_SRC_CFG); 529 writel(S5PC110_DMA_DST_CFG_READ, base + S5PC110_DMA_DST_CFG); 530 } else { 531 writel(S5PC110_DMA_SRC_CFG_WRITE, base + S5PC110_DMA_SRC_CFG); 532 writel(S5PC110_DMA_DST_CFG_WRITE, base + S5PC110_DMA_DST_CFG); 533 } 534 535 writel(count, base + S5PC110_DMA_TRANS_SIZE); 536 writel(direction, base + S5PC110_DMA_TRANS_DIR); 537 538 writel(S5PC110_DMA_TRANS_CMD_TR, base + S5PC110_DMA_TRANS_CMD); 539 540 /* 541 * There's no exact timeout values at Spec. 542 * In real case it takes under 1 msec. 543 * So 20 msecs are enough. 544 */ 545 timeout = jiffies + msecs_to_jiffies(20); 546 547 do { 548 status = readl(base + S5PC110_DMA_TRANS_STATUS); 549 if (status & S5PC110_DMA_TRANS_STATUS_TE) { 550 writel(S5PC110_DMA_TRANS_CMD_TEC, 551 base + S5PC110_DMA_TRANS_CMD); 552 return -EIO; 553 } 554 } while (!(status & S5PC110_DMA_TRANS_STATUS_TD) && 555 time_before(jiffies, timeout)); 556 557 writel(S5PC110_DMA_TRANS_CMD_TDC, base + S5PC110_DMA_TRANS_CMD); 558 559 return 0; 560 } 561 562 static irqreturn_t s5pc110_onenand_irq(int irq, void *data) 563 { 564 void __iomem *base = onenand->dma_addr; 565 int status, cmd = 0; 566 567 status = readl(base + S5PC110_INTC_DMA_STATUS); 568 569 if (likely(status & S5PC110_INTC_DMA_TD)) 570 cmd = S5PC110_DMA_TRANS_CMD_TDC; 571 572 if (unlikely(status & S5PC110_INTC_DMA_TE)) 573 cmd = S5PC110_DMA_TRANS_CMD_TEC; 574 575 writel(cmd, base + S5PC110_DMA_TRANS_CMD); 576 writel(status, base + S5PC110_INTC_DMA_CLR); 577 578 if (!onenand->complete.done) 579 complete(&onenand->complete); 580 581 return IRQ_HANDLED; 582 } 583 584 static int s5pc110_dma_irq(dma_addr_t dst, dma_addr_t src, size_t count, int direction) 585 { 586 void __iomem *base = onenand->dma_addr; 587 int status; 588 589 status = readl(base + S5PC110_INTC_DMA_MASK); 590 if (status) { 591 status &= ~(S5PC110_INTC_DMA_TD | S5PC110_INTC_DMA_TE); 592 writel(status, base + S5PC110_INTC_DMA_MASK); 593 } 594 595 writel(src, base + S5PC110_DMA_SRC_ADDR); 596 writel(dst, base + S5PC110_DMA_DST_ADDR); 597 598 if (direction == S5PC110_DMA_DIR_READ) { 599 writel(S5PC110_DMA_SRC_CFG_READ, base + S5PC110_DMA_SRC_CFG); 600 writel(S5PC110_DMA_DST_CFG_READ, base + S5PC110_DMA_DST_CFG); 601 } else { 602 writel(S5PC110_DMA_SRC_CFG_WRITE, base + S5PC110_DMA_SRC_CFG); 603 writel(S5PC110_DMA_DST_CFG_WRITE, base + S5PC110_DMA_DST_CFG); 604 } 605 606 writel(count, base + S5PC110_DMA_TRANS_SIZE); 607 writel(direction, base + S5PC110_DMA_TRANS_DIR); 608 609 writel(S5PC110_DMA_TRANS_CMD_TR, base + S5PC110_DMA_TRANS_CMD); 610 611 wait_for_completion_timeout(&onenand->complete, msecs_to_jiffies(20)); 612 613 return 0; 614 } 615 616 static int s5pc110_read_bufferram(struct mtd_info *mtd, int area, 617 unsigned char *buffer, int offset, size_t count) 618 { 619 struct onenand_chip *this = mtd->priv; 620 void __iomem *p; 621 void *buf = (void *) buffer; 622 dma_addr_t dma_src, dma_dst; 623 int err, ofs, page_dma = 0; 624 struct device *dev = &onenand->pdev->dev; 625 626 p = this->base + area; 627 if (ONENAND_CURRENT_BUFFERRAM(this)) { 628 if (area == ONENAND_DATARAM) 629 p += this->writesize; 630 else 631 p += mtd->oobsize; 632 } 633 634 if (offset & 3 || (size_t) buf & 3 || 635 !onenand->dma_addr || count != mtd->writesize) 636 goto normal; 637 638 /* Handle vmalloc address */ 639 if (buf >= high_memory) { 640 struct page *page; 641 642 if (((size_t) buf & PAGE_MASK) != 643 ((size_t) (buf + count - 1) & PAGE_MASK)) 644 goto normal; 645 page = vmalloc_to_page(buf); 646 if (!page) 647 goto normal; 648 649 /* Page offset */ 650 ofs = ((size_t) buf & ~PAGE_MASK); 651 page_dma = 1; 652 653 /* DMA routine */ 654 dma_src = onenand->phys_base + (p - this->base); 655 dma_dst = dma_map_page(dev, page, ofs, count, DMA_FROM_DEVICE); 656 } else { 657 /* DMA routine */ 658 dma_src = onenand->phys_base + (p - this->base); 659 dma_dst = dma_map_single(dev, buf, count, DMA_FROM_DEVICE); 660 } 661 if (dma_mapping_error(dev, dma_dst)) { 662 dev_err(dev, "Couldn't map a %zu byte buffer for DMA\n", count); 663 goto normal; 664 } 665 err = s5pc110_dma_ops(dma_dst, dma_src, 666 count, S5PC110_DMA_DIR_READ); 667 668 if (page_dma) 669 dma_unmap_page(dev, dma_dst, count, DMA_FROM_DEVICE); 670 else 671 dma_unmap_single(dev, dma_dst, count, DMA_FROM_DEVICE); 672 673 if (!err) 674 return 0; 675 676 normal: 677 if (count != mtd->writesize) { 678 /* Copy the bufferram to memory to prevent unaligned access */ 679 memcpy_fromio(this->page_buf, p, mtd->writesize); 680 memcpy(buffer, this->page_buf + offset, count); 681 } else { 682 memcpy_fromio(buffer, p, count); 683 } 684 685 return 0; 686 } 687 688 static int s5pc110_chip_probe(struct mtd_info *mtd) 689 { 690 /* Now just return 0 */ 691 return 0; 692 } 693 694 static int s3c_onenand_bbt_wait(struct mtd_info *mtd, int state) 695 { 696 unsigned int flags = INT_ACT | LOAD_CMP; 697 unsigned int stat; 698 unsigned long timeout; 699 700 /* The 20 msec is enough */ 701 timeout = jiffies + msecs_to_jiffies(20); 702 while (time_before(jiffies, timeout)) { 703 stat = s3c_read_reg(INT_ERR_STAT_OFFSET); 704 if (stat & flags) 705 break; 706 } 707 /* To get correct interrupt status in timeout case */ 708 stat = s3c_read_reg(INT_ERR_STAT_OFFSET); 709 s3c_write_reg(stat, INT_ERR_ACK_OFFSET); 710 711 if (stat & LD_FAIL_ECC_ERR) { 712 s3c_onenand_reset(); 713 return ONENAND_BBT_READ_ERROR; 714 } 715 716 if (stat & LOAD_CMP) { 717 int ecc = s3c_read_reg(ECC_ERR_STAT_OFFSET); 718 if (ecc & ONENAND_ECC_4BIT_UNCORRECTABLE) { 719 s3c_onenand_reset(); 720 return ONENAND_BBT_READ_ERROR; 721 } 722 } 723 724 return 0; 725 } 726 727 static void s3c_onenand_check_lock_status(struct mtd_info *mtd) 728 { 729 struct onenand_chip *this = mtd->priv; 730 struct device *dev = &onenand->pdev->dev; 731 unsigned int block, end; 732 733 end = this->chipsize >> this->erase_shift; 734 735 for (block = 0; block < end; block++) { 736 unsigned int mem_addr = onenand->mem_addr(block, 0, 0); 737 s3c_read_cmd(CMD_MAP_01(onenand, mem_addr)); 738 739 if (s3c_read_reg(INT_ERR_STAT_OFFSET) & LOCKED_BLK) { 740 dev_err(dev, "block %d is write-protected!\n", block); 741 s3c_write_reg(LOCKED_BLK, INT_ERR_ACK_OFFSET); 742 } 743 } 744 } 745 746 static void s3c_onenand_do_lock_cmd(struct mtd_info *mtd, loff_t ofs, 747 size_t len, int cmd) 748 { 749 struct onenand_chip *this = mtd->priv; 750 int start, end, start_mem_addr, end_mem_addr; 751 752 start = ofs >> this->erase_shift; 753 start_mem_addr = onenand->mem_addr(start, 0, 0); 754 end = start + (len >> this->erase_shift) - 1; 755 end_mem_addr = onenand->mem_addr(end, 0, 0); 756 757 if (cmd == ONENAND_CMD_LOCK) { 758 s3c_write_cmd(ONENAND_LOCK_START, CMD_MAP_10(onenand, 759 start_mem_addr)); 760 s3c_write_cmd(ONENAND_LOCK_END, CMD_MAP_10(onenand, 761 end_mem_addr)); 762 } else { 763 s3c_write_cmd(ONENAND_UNLOCK_START, CMD_MAP_10(onenand, 764 start_mem_addr)); 765 s3c_write_cmd(ONENAND_UNLOCK_END, CMD_MAP_10(onenand, 766 end_mem_addr)); 767 } 768 769 this->wait(mtd, FL_LOCKING); 770 } 771 772 static void s3c_unlock_all(struct mtd_info *mtd) 773 { 774 struct onenand_chip *this = mtd->priv; 775 loff_t ofs = 0; 776 size_t len = this->chipsize; 777 778 if (this->options & ONENAND_HAS_UNLOCK_ALL) { 779 /* Write unlock command */ 780 this->command(mtd, ONENAND_CMD_UNLOCK_ALL, 0, 0); 781 782 /* No need to check return value */ 783 this->wait(mtd, FL_LOCKING); 784 785 /* Workaround for all block unlock in DDP */ 786 if (!ONENAND_IS_DDP(this)) { 787 s3c_onenand_check_lock_status(mtd); 788 return; 789 } 790 791 /* All blocks on another chip */ 792 ofs = this->chipsize >> 1; 793 len = this->chipsize >> 1; 794 } 795 796 s3c_onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_UNLOCK); 797 798 s3c_onenand_check_lock_status(mtd); 799 } 800 801 static void s3c_onenand_setup(struct mtd_info *mtd) 802 { 803 struct onenand_chip *this = mtd->priv; 804 805 onenand->mtd = mtd; 806 807 if (onenand->type == TYPE_S3C6400) { 808 onenand->mem_addr = s3c6400_mem_addr; 809 onenand->cmd_map = s3c64xx_cmd_map; 810 } else if (onenand->type == TYPE_S3C6410) { 811 onenand->mem_addr = s3c6410_mem_addr; 812 onenand->cmd_map = s3c64xx_cmd_map; 813 } else if (onenand->type == TYPE_S5PC110) { 814 /* Use generic onenand functions */ 815 this->read_bufferram = s5pc110_read_bufferram; 816 this->chip_probe = s5pc110_chip_probe; 817 return; 818 } else { 819 BUG(); 820 } 821 822 this->read_word = s3c_onenand_readw; 823 this->write_word = s3c_onenand_writew; 824 825 this->wait = s3c_onenand_wait; 826 this->bbt_wait = s3c_onenand_bbt_wait; 827 this->unlock_all = s3c_unlock_all; 828 this->command = s3c_onenand_command; 829 830 this->read_bufferram = onenand_read_bufferram; 831 this->write_bufferram = onenand_write_bufferram; 832 } 833 834 static int s3c_onenand_probe(struct platform_device *pdev) 835 { 836 struct onenand_platform_data *pdata; 837 struct onenand_chip *this; 838 struct mtd_info *mtd; 839 struct resource *r; 840 int size, err; 841 842 pdata = dev_get_platdata(&pdev->dev); 843 /* No need to check pdata. the platform data is optional */ 844 845 size = sizeof(struct mtd_info) + sizeof(struct onenand_chip); 846 mtd = devm_kzalloc(&pdev->dev, size, GFP_KERNEL); 847 if (!mtd) 848 return -ENOMEM; 849 850 onenand = devm_kzalloc(&pdev->dev, sizeof(struct s3c_onenand), 851 GFP_KERNEL); 852 if (!onenand) 853 return -ENOMEM; 854 855 this = (struct onenand_chip *) &mtd[1]; 856 mtd->priv = this; 857 mtd->dev.parent = &pdev->dev; 858 onenand->pdev = pdev; 859 onenand->type = platform_get_device_id(pdev)->driver_data; 860 861 s3c_onenand_setup(mtd); 862 863 onenand->base = devm_platform_get_and_ioremap_resource(pdev, 0, &r); 864 if (IS_ERR(onenand->base)) 865 return PTR_ERR(onenand->base); 866 867 onenand->phys_base = r->start; 868 869 /* Set onenand_chip also */ 870 this->base = onenand->base; 871 872 /* Use runtime badblock check */ 873 this->options |= ONENAND_SKIP_UNLOCK_CHECK; 874 875 if (onenand->type != TYPE_S5PC110) { 876 onenand->ahb_addr = devm_platform_ioremap_resource(pdev, 1); 877 if (IS_ERR(onenand->ahb_addr)) 878 return PTR_ERR(onenand->ahb_addr); 879 880 /* Allocate 4KiB BufferRAM */ 881 onenand->page_buf = devm_kzalloc(&pdev->dev, SZ_4K, 882 GFP_KERNEL); 883 if (!onenand->page_buf) 884 return -ENOMEM; 885 886 /* Allocate 128 SpareRAM */ 887 onenand->oob_buf = devm_kzalloc(&pdev->dev, 128, GFP_KERNEL); 888 if (!onenand->oob_buf) 889 return -ENOMEM; 890 891 /* S3C doesn't handle subpage write */ 892 mtd->subpage_sft = 0; 893 this->subpagesize = mtd->writesize; 894 895 } else { /* S5PC110 */ 896 onenand->dma_addr = devm_platform_ioremap_resource(pdev, 1); 897 if (IS_ERR(onenand->dma_addr)) 898 return PTR_ERR(onenand->dma_addr); 899 900 s5pc110_dma_ops = s5pc110_dma_poll; 901 /* Interrupt support */ 902 r = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 903 if (r) { 904 init_completion(&onenand->complete); 905 s5pc110_dma_ops = s5pc110_dma_irq; 906 err = devm_request_irq(&pdev->dev, r->start, 907 s5pc110_onenand_irq, 908 IRQF_SHARED, "onenand", 909 &onenand); 910 if (err) { 911 dev_err(&pdev->dev, "failed to get irq\n"); 912 return err; 913 } 914 } 915 } 916 917 err = onenand_scan(mtd, 1); 918 if (err) 919 return err; 920 921 if (onenand->type != TYPE_S5PC110) { 922 /* S3C doesn't handle subpage write */ 923 mtd->subpage_sft = 0; 924 this->subpagesize = mtd->writesize; 925 } 926 927 if (s3c_read_reg(MEM_CFG_OFFSET) & ONENAND_SYS_CFG1_SYNC_READ) 928 dev_info(&onenand->pdev->dev, "OneNAND Sync. Burst Read enabled\n"); 929 930 err = mtd_device_register(mtd, pdata ? pdata->parts : NULL, 931 pdata ? pdata->nr_parts : 0); 932 if (err) { 933 dev_err(&pdev->dev, "failed to parse partitions and register the MTD device\n"); 934 onenand_release(mtd); 935 return err; 936 } 937 938 platform_set_drvdata(pdev, mtd); 939 940 return 0; 941 } 942 943 static void s3c_onenand_remove(struct platform_device *pdev) 944 { 945 struct mtd_info *mtd = platform_get_drvdata(pdev); 946 947 onenand_release(mtd); 948 } 949 950 static int s3c_pm_ops_suspend(struct device *dev) 951 { 952 struct mtd_info *mtd = dev_get_drvdata(dev); 953 struct onenand_chip *this = mtd->priv; 954 955 this->wait(mtd, FL_PM_SUSPENDED); 956 return 0; 957 } 958 959 static int s3c_pm_ops_resume(struct device *dev) 960 { 961 struct mtd_info *mtd = dev_get_drvdata(dev); 962 struct onenand_chip *this = mtd->priv; 963 964 this->unlock_all(mtd); 965 return 0; 966 } 967 968 static const struct dev_pm_ops s3c_pm_ops = { 969 .suspend = s3c_pm_ops_suspend, 970 .resume = s3c_pm_ops_resume, 971 }; 972 973 static const struct platform_device_id s3c_onenand_driver_ids[] = { 974 { 975 .name = "s3c6400-onenand", 976 .driver_data = TYPE_S3C6400, 977 }, { 978 .name = "s3c6410-onenand", 979 .driver_data = TYPE_S3C6410, 980 }, { 981 .name = "s5pc110-onenand", 982 .driver_data = TYPE_S5PC110, 983 }, { }, 984 }; 985 MODULE_DEVICE_TABLE(platform, s3c_onenand_driver_ids); 986 987 static struct platform_driver s3c_onenand_driver = { 988 .driver = { 989 .name = "samsung-onenand", 990 .pm = &s3c_pm_ops, 991 }, 992 .id_table = s3c_onenand_driver_ids, 993 .probe = s3c_onenand_probe, 994 .remove = s3c_onenand_remove, 995 }; 996 997 module_platform_driver(s3c_onenand_driver); 998 999 MODULE_LICENSE("GPL"); 1000 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>"); 1001 MODULE_DESCRIPTION("Samsung OneNAND controller support"); 1002