| /* |
| * drivers/mtd/nand.c |
| * |
| * Overview: |
| * This is the generic MTD driver for NAND flash devices. It should be |
| * capable of working with almost all NAND chips currently available. |
| * Basic support for AG-AND chips is provided. |
| * |
| * Additional technical information is available on |
| * http://www.linux-mtd.infradead.org/doc/nand.html |
| * |
| * Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com) |
| * 2002-2006 Thomas Gleixner (tglx@linutronix.de) |
| * |
| * Credits: |
| * David Woodhouse for adding multichip support |
| * |
| * Aleph One Ltd. and Toby Churchill Ltd. for supporting the |
| * rework for 2K page size chips |
| * |
| * TODO: |
| * Enable cached programming for 2k page size chips |
| * Check, if mtd->ecctype should be set to MTD_ECC_HW |
| * if we have HW ecc support. |
| * The AG-AND chips have nice features for speed improvement, |
| * which are not supported yet. Read / program 4 pages in one go. |
| * BBT table is not serialized, has to be fixed |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| */ |
| #include <common.h> |
| #include <errno.h> |
| #include <clock.h> |
| #include <linux/mtd/mtd.h> |
| #include <linux/mtd/nand.h> |
| #include <linux/err.h> |
| #include <linux/mtd/nand_ecc.h> |
| #include <mtd/nand_bch.h> |
| #include <asm/byteorder.h> |
| #include <asm/io.h> |
| #include <malloc.h> |
| #include <module.h> |
| |
| #include "nand.h" |
| |
| #ifndef DOXYGEN_SHOULD_SKIP_THIS |
| |
| /* Define default oob placement schemes for large and small page devices */ |
| static struct nand_ecclayout nand_oob_8 = { |
| .eccbytes = 3, |
| .eccpos = {0, 1, 2}, |
| .oobfree = { |
| {.offset = 3, |
| .length = 2}, |
| {.offset = 6, |
| .length = 2}} |
| }; |
| |
| static struct nand_ecclayout nand_oob_16 = { |
| .eccbytes = 6, |
| .eccpos = {0, 1, 2, 3, 6, 7}, |
| .oobfree = { |
| {.offset = 8, |
| . length = 8}} |
| }; |
| |
| static struct nand_ecclayout nand_oob_64 = { |
| .eccbytes = 24, |
| .eccpos = { |
| 40, 41, 42, 43, 44, 45, 46, 47, |
| 48, 49, 50, 51, 52, 53, 54, 55, |
| 56, 57, 58, 59, 60, 61, 62, 63}, |
| .oobfree = { |
| {.offset = 2, |
| .length = 38}} |
| }; |
| |
| static struct nand_ecclayout nand_oob_128 = { |
| .eccbytes = 48, |
| .eccpos = { |
| 80, 81, 82, 83, 84, 85, 86, 87, |
| 88, 89, 90, 91, 92, 93, 94, 95, |
| 96, 97, 98, 99, 100, 101, 102, 103, |
| 104, 105, 106, 107, 108, 109, 110, 111, |
| 112, 113, 114, 115, 116, 117, 118, 119, |
| 120, 121, 122, 123, 124, 125, 126, 127}, |
| .oobfree = { |
| {.offset = 2, |
| .length = 78} } |
| }; |
| |
| |
| #define DEFINE_LED_TRIGGER(x) |
| #define DEFINE_LED_TRIGGER_GLOBAL(x) |
| #define led_trigger_register_simple(x, y) do {} while(0) |
| #define led_trigger_unregister_simple(x) do {} while(0) |
| #define led_trigger_event(x, y) do {} while(0) |
| |
| /* |
| * For devices which display every fart in the system on a separate LED. Is |
| * compiled away when LED support is disabled. |
| */ |
| DEFINE_LED_TRIGGER(nand_led_trigger); |
| |
| /** |
| * nand_read_byte - [DEFAULT] read one byte from the chip |
| * @mtd: MTD device structure |
| * |
| * Default read function for 8bit buswith |
| */ |
| static uint8_t nand_read_byte(struct mtd_info *mtd) |
| { |
| struct nand_chip *chip = mtd->priv; |
| return readb(chip->IO_ADDR_R); |
| } |
| |
| /** |
| * nand_read_byte16 - [DEFAULT] read one byte endianess aware from the chip |
| * @mtd: MTD device structure |
| * |
| * Default read function for 16bit buswith with |
| * endianess conversion |
| */ |
| static uint8_t nand_read_byte16(struct mtd_info *mtd) |
| { |
| struct nand_chip *chip = mtd->priv; |
| return (uint8_t) cpu_to_le16(readw(chip->IO_ADDR_R)); |
| } |
| |
| /** |
| * nand_read_word - [DEFAULT] read one word from the chip |
| * @mtd: MTD device structure |
| * |
| * Default read function for 16bit buswith without |
| * endianess conversion |
| */ |
| static u16 nand_read_word(struct mtd_info *mtd) |
| { |
| struct nand_chip *chip = mtd->priv; |
| return readw(chip->IO_ADDR_R); |
| } |
| |
| /** |
| * nand_select_chip - [DEFAULT] control CE line |
| * @mtd: MTD device structure |
| * @chipnr: chipnumber to select, -1 for deselect |
| * |
| * Default select function for 1 chip devices. |
| */ |
| static void nand_select_chip(struct mtd_info *mtd, int chipnr) |
| { |
| struct nand_chip *chip = mtd->priv; |
| |
| switch (chipnr) { |
| case -1: |
| chip->cmd_ctrl(mtd, NAND_CMD_NONE, 0 | NAND_CTRL_CHANGE); |
| break; |
| case 0: |
| break; |
| default: |
| printf("%s: illegal chip number %d\n", __func__, chipnr); |
| } |
| } |
| |
| /** |
| * nand_read_buf - [DEFAULT] read chip data into buffer |
| * @mtd: MTD device structure |
| * @buf: buffer to store date |
| * @len: number of bytes to read |
| * |
| * Default read function for 8bit buswith |
| */ |
| static void nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len) |
| { |
| int i; |
| struct nand_chip *chip = mtd->priv; |
| |
| for (i = 0; i < len; i++) |
| buf[i] = readb(chip->IO_ADDR_R); |
| } |
| |
| /** |
| * nand_verify_buf - [DEFAULT] Verify chip data against buffer |
| * @mtd: MTD device structure |
| * @buf: buffer containing the data to compare |
| * @len: number of bytes to compare |
| * |
| * Default verify function for 8bit buswith |
| */ |
| static int nand_verify_buf(struct mtd_info *mtd, const uint8_t *buf, int len) |
| { |
| int i; |
| struct nand_chip *chip = mtd->priv; |
| |
| for (i = 0; i < len; i++) |
| if (buf[i] != readb(chip->IO_ADDR_R)) |
| return -EFAULT; |
| return 0; |
| } |
| |
| /** |
| * nand_read_buf16 - [DEFAULT] read chip data into buffer |
| * @mtd: MTD device structure |
| * @buf: buffer to store date |
| * @len: number of bytes to read |
| * |
| * Default read function for 16bit buswith |
| */ |
| static void nand_read_buf16(struct mtd_info *mtd, uint8_t *buf, int len) |
| { |
| int i; |
| struct nand_chip *chip = mtd->priv; |
| u16 *p = (u16 *) buf; |
| len >>= 1; |
| |
| for (i = 0; i < len; i++) |
| p[i] = readw(chip->IO_ADDR_R); |
| } |
| |
| /** |
| * nand_verify_buf16 - [DEFAULT] Verify chip data against buffer |
| * @mtd: MTD device structure |
| * @buf: buffer containing the data to compare |
| * @len: number of bytes to compare |
| * |
| * Default verify function for 16bit buswith |
| */ |
| static int nand_verify_buf16(struct mtd_info *mtd, const uint8_t *buf, int len) |
| { |
| int i; |
| struct nand_chip *chip = mtd->priv; |
| u16 *p = (u16 *) buf; |
| len >>= 1; |
| |
| for (i = 0; i < len; i++) |
| if (p[i] != readw(chip->IO_ADDR_R)) |
| return -EFAULT; |
| |
| return 0; |
| } |
| |
| /** |
| * nand_block_bad - [DEFAULT] Read bad block marker from the chip |
| * @mtd: MTD device structure |
| * @ofs: offset from device start |
| * @getchip: 0, if the chip is already selected |
| * |
| * Check, if the block is bad. |
| */ |
| static int nand_block_bad(struct mtd_info *mtd, loff_t ofs, int getchip) |
| { |
| int page, chipnr, res = 0; |
| struct nand_chip *chip = mtd->priv; |
| u16 bad; |
| |
| page = (int)(ofs >> chip->page_shift) & chip->pagemask; |
| |
| if (getchip) { |
| chipnr = (int)(ofs >> chip->chip_shift); |
| |
| /* Select the NAND device */ |
| chip->select_chip(mtd, chipnr); |
| } |
| |
| if (chip->options & NAND_BUSWIDTH_16) { |
| chip->cmdfunc(mtd, NAND_CMD_READOOB, chip->badblockpos & 0xFE, |
| page); |
| bad = cpu_to_le16(chip->read_word(mtd)); |
| if (chip->badblockpos & 0x1) |
| bad >>= 8; |
| if ((bad & 0xFF) != 0xff) |
| res = 1; |
| } else { |
| chip->cmdfunc(mtd, NAND_CMD_READOOB, chip->badblockpos, page); |
| if (chip->read_byte(mtd) != 0xff) |
| res = 1; |
| } |
| |
| return res; |
| } |
| |
| /** |
| * nand_block_checkbad - [GENERIC] Check if a block is marked bad |
| * @mtd: MTD device structure |
| * @ofs: offset from device start |
| * @getchip: 0, if the chip is already selected |
| * @allowbbt: 1, if its allowed to access the bbt area |
| * |
| * Check, if the block is bad. Either by reading the bad block table or |
| * calling of the scan function. |
| */ |
| int nand_block_checkbad(struct mtd_info *mtd, loff_t ofs, int getchip, |
| int allowbbt) |
| { |
| struct nand_chip *chip = mtd->priv; |
| |
| #ifdef CONFIG_NAND_BBT |
| if (!chip->bbt) |
| return chip->block_bad(mtd, ofs, getchip); |
| /* Return info from the table */ |
| return nand_isbad_bbt(mtd, ofs, allowbbt); |
| #else |
| return chip->block_bad(mtd, ofs, getchip); |
| #endif |
| } |
| |
| /* |
| * Wait for the ready pin, after a command |
| * The timeout is catched later. |
| */ |
| void nand_wait_ready(struct mtd_info *mtd) |
| { |
| struct nand_chip *chip = mtd->priv; |
| uint64_t start = get_time_ns(); |
| |
| led_trigger_event(nand_led_trigger, LED_FULL); |
| /* wait until command is processed or timeout occures */ |
| do { |
| if (chip->dev_ready(mtd)) |
| break; |
| } while (!is_timeout(start, SECOND * 2)); |
| led_trigger_event(nand_led_trigger, LED_OFF); |
| } |
| EXPORT_SYMBOL(nand_wait_ready); |
| |
| /** |
| * nand_command - [DEFAULT] Send command to NAND device |
| * @mtd: MTD device structure |
| * @command: the command to be sent |
| * @column: the column address for this command, -1 if none |
| * @page_addr: the page address for this command, -1 if none |
| * |
| * Send command to NAND device. This function is used for small page |
| * devices (256/512 Bytes per page) |
| */ |
| static void nand_command(struct mtd_info *mtd, unsigned int command, |
| int column, int page_addr) |
| { |
| register struct nand_chip *chip = mtd->priv; |
| int ctrl = NAND_CTRL_CLE | NAND_CTRL_CHANGE; |
| |
| /* |
| * Write out the command to the device. |
| */ |
| if (command == NAND_CMD_SEQIN) { |
| int readcmd; |
| |
| if (column >= mtd->writesize) { |
| /* OOB area */ |
| column -= mtd->writesize; |
| readcmd = NAND_CMD_READOOB; |
| } else if (column < 256) { |
| /* First 256 bytes --> READ0 */ |
| readcmd = NAND_CMD_READ0; |
| } else { |
| column -= 256; |
| readcmd = NAND_CMD_READ1; |
| } |
| chip->cmd_ctrl(mtd, readcmd, ctrl); |
| ctrl &= ~NAND_CTRL_CHANGE; |
| } |
| chip->cmd_ctrl(mtd, command, ctrl); |
| |
| /* |
| * Address cycle, when necessary |
| */ |
| ctrl = NAND_CTRL_ALE | NAND_CTRL_CHANGE; |
| /* Serially input address */ |
| if (column != -1) { |
| /* Adjust columns for 16 bit buswidth */ |
| if (chip->options & NAND_BUSWIDTH_16) |
| column >>= 1; |
| chip->cmd_ctrl(mtd, column, ctrl); |
| ctrl &= ~NAND_CTRL_CHANGE; |
| } |
| if (page_addr != -1) { |
| chip->cmd_ctrl(mtd, page_addr, ctrl); |
| ctrl &= ~NAND_CTRL_CHANGE; |
| chip->cmd_ctrl(mtd, page_addr >> 8, ctrl); |
| /* One more address cycle for devices > 32MiB */ |
| if (chip->chipsize > (32 << 20)) |
| chip->cmd_ctrl(mtd, page_addr >> 16, ctrl); |
| } |
| chip->cmd_ctrl(mtd, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE); |
| |
| /* |
| * program and erase have their own busy handlers |
| * status and sequential in needs no delay |
| */ |
| switch (command) { |
| |
| case NAND_CMD_PAGEPROG: |
| case NAND_CMD_ERASE1: |
| case NAND_CMD_ERASE2: |
| case NAND_CMD_SEQIN: |
| case NAND_CMD_STATUS: |
| return; |
| |
| case NAND_CMD_RESET: |
| if (chip->dev_ready) |
| break; |
| udelay(chip->chip_delay); |
| chip->cmd_ctrl(mtd, NAND_CMD_STATUS, |
| NAND_CTRL_CLE | NAND_CTRL_CHANGE); |
| chip->cmd_ctrl(mtd, |
| NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE); |
| while (!(chip->read_byte(mtd) & NAND_STATUS_READY)) ; |
| return; |
| |
| /* This applies to read commands */ |
| default: |
| /* |
| * If we don't have access to the busy pin, we apply the given |
| * command delay |
| */ |
| if (!chip->dev_ready) { |
| udelay(chip->chip_delay); |
| return; |
| } |
| } |
| /* Apply this short delay always to ensure that we do wait tWB in |
| * any case on any machine. */ |
| ndelay(100); |
| |
| nand_wait_ready(mtd); |
| } |
| |
| /** |
| * nand_command_lp - [DEFAULT] Send command to NAND large page device |
| * @mtd: MTD device structure |
| * @command: the command to be sent |
| * @column: the column address for this command, -1 if none |
| * @page_addr: the page address for this command, -1 if none |
| * |
| * Send command to NAND device. This is the version for the new large page |
| * devices We dont have the separate regions as we have in the small page |
| * devices. We must emulate NAND_CMD_READOOB to keep the code compatible. |
| */ |
| static void nand_command_lp(struct mtd_info *mtd, unsigned int command, |
| int column, int page_addr) |
| { |
| register struct nand_chip *chip = mtd->priv; |
| |
| /* Emulate NAND_CMD_READOOB */ |
| if (command == NAND_CMD_READOOB) { |
| column += mtd->writesize; |
| command = NAND_CMD_READ0; |
| } |
| |
| /* Command latch cycle */ |
| chip->cmd_ctrl(mtd, command & 0xff, |
| NAND_NCE | NAND_CLE | NAND_CTRL_CHANGE); |
| |
| if (column != -1 || page_addr != -1) { |
| int ctrl = NAND_CTRL_CHANGE | NAND_NCE | NAND_ALE; |
| |
| /* Serially input address */ |
| if (column != -1) { |
| /* Adjust columns for 16 bit buswidth */ |
| if (chip->options & NAND_BUSWIDTH_16) |
| column >>= 1; |
| chip->cmd_ctrl(mtd, column, ctrl); |
| ctrl &= ~NAND_CTRL_CHANGE; |
| chip->cmd_ctrl(mtd, column >> 8, ctrl); |
| } |
| if (page_addr != -1) { |
| chip->cmd_ctrl(mtd, page_addr, ctrl); |
| chip->cmd_ctrl(mtd, page_addr >> 8, |
| NAND_NCE | NAND_ALE); |
| /* One more address cycle for devices > 128MiB */ |
| if (chip->chipsize > (128 << 20)) |
| chip->cmd_ctrl(mtd, page_addr >> 16, |
| NAND_NCE | NAND_ALE); |
| } |
| } |
| chip->cmd_ctrl(mtd, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE); |
| |
| /* |
| * program and erase have their own busy handlers |
| * status, sequential in, and deplete1 need no delay |
| */ |
| switch (command) { |
| |
| case NAND_CMD_CACHEDPROG: |
| case NAND_CMD_PAGEPROG: |
| case NAND_CMD_ERASE1: |
| case NAND_CMD_ERASE2: |
| case NAND_CMD_SEQIN: |
| case NAND_CMD_RNDIN: |
| case NAND_CMD_STATUS: |
| case NAND_CMD_DEPLETE1: |
| return; |
| |
| /* |
| * read error status commands require only a short delay |
| */ |
| case NAND_CMD_STATUS_ERROR: |
| case NAND_CMD_STATUS_ERROR0: |
| case NAND_CMD_STATUS_ERROR1: |
| case NAND_CMD_STATUS_ERROR2: |
| case NAND_CMD_STATUS_ERROR3: |
| udelay(chip->chip_delay); |
| return; |
| |
| case NAND_CMD_RESET: |
| if (chip->dev_ready) |
| break; |
| udelay(chip->chip_delay); |
| chip->cmd_ctrl(mtd, NAND_CMD_STATUS, |
| NAND_NCE | NAND_CLE | NAND_CTRL_CHANGE); |
| chip->cmd_ctrl(mtd, NAND_CMD_NONE, |
| NAND_NCE | NAND_CTRL_CHANGE); |
| while (!(chip->read_byte(mtd) & NAND_STATUS_READY)) ; |
| return; |
| |
| case NAND_CMD_RNDOUT: |
| /* No ready / busy check necessary */ |
| chip->cmd_ctrl(mtd, NAND_CMD_RNDOUTSTART, |
| NAND_NCE | NAND_CLE | NAND_CTRL_CHANGE); |
| chip->cmd_ctrl(mtd, NAND_CMD_NONE, |
| NAND_NCE | NAND_CTRL_CHANGE); |
| return; |
| |
| case NAND_CMD_READ0: |
| chip->cmd_ctrl(mtd, NAND_CMD_READSTART, |
| NAND_NCE | NAND_CLE | NAND_CTRL_CHANGE); |
| chip->cmd_ctrl(mtd, NAND_CMD_NONE, |
| NAND_NCE | NAND_CTRL_CHANGE); |
| |
| /* This applies to read commands */ |
| default: |
| /* |
| * If we don't have access to the busy pin, we apply the given |
| * command delay |
| */ |
| if (!chip->dev_ready) { |
| udelay(chip->chip_delay); |
| return; |
| } |
| } |
| |
| /* Apply this short delay always to ensure that we do wait tWB in |
| * any case on any machine. */ |
| ndelay(100); |
| |
| nand_wait_ready(mtd); |
| } |
| |
| /** |
| * nand_wait - [DEFAULT] wait until the command is done |
| * @mtd: MTD device structure |
| * @chip: NAND chip structure |
| * |
| * Wait for command done. This applies to erase and program only |
| * Erase can take up to 400ms and program up to 20ms according to |
| * general NAND and SmartMedia specs |
| */ |
| static int nand_wait(struct mtd_info *mtd, struct nand_chip *chip) |
| { |
| |
| uint64_t start = get_time_ns(); |
| uint64_t timeo; |
| int status, state = chip->state; |
| |
| if (state == FL_ERASING) |
| timeo = 400 * MSECOND; |
| else |
| timeo = 20 * MSECOND; |
| |
| led_trigger_event(nand_led_trigger, LED_FULL); |
| |
| /* Apply this short delay always to ensure that we do wait tWB in |
| * any case on any machine. */ |
| ndelay(100); |
| |
| if ((state == FL_ERASING) && (chip->options & NAND_IS_AND)) |
| chip->cmdfunc(mtd, NAND_CMD_STATUS_MULTI, -1, -1); |
| else |
| chip->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1); |
| |
| while (!is_timeout(start, timeo)) { |
| if (chip->dev_ready) { |
| if (chip->dev_ready(mtd)) |
| break; |
| } else { |
| if (chip->read_byte(mtd) & NAND_STATUS_READY) |
| break; |
| } |
| } |
| led_trigger_event(nand_led_trigger, LED_OFF); |
| |
| status = (int)chip->read_byte(mtd); |
| return status; |
| } |
| |
| /** |
| * nand_read_page_raw - [Intern] read raw page data without ecc |
| * @mtd: mtd info structure |
| * @chip: nand chip info structure |
| * @buf: buffer to store read data |
| */ |
| static int nand_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip, |
| uint8_t *buf) |
| { |
| chip->read_buf(mtd, buf, mtd->writesize); |
| chip->read_buf(mtd, chip->oob_poi, mtd->oobsize); |
| return 0; |
| } |
| |
| /** |
| * nand_transfer_oob - [Internal] Transfer oob to client buffer |
| * @chip: nand chip structure |
| * @oob: oob destination address |
| * @ops: oob ops structure |
| * @len: size of oob to transfer |
| */ |
| #ifdef CONFIG_NAND_READ_OOB |
| static uint8_t *nand_transfer_oob(struct nand_chip *chip, uint8_t *oob, |
| struct mtd_oob_ops *ops, size_t len) |
| { |
| switch(ops->mode) { |
| |
| case MTD_OOB_PLACE: |
| case MTD_OOB_RAW: |
| memcpy(oob, chip->oob_poi + ops->ooboffs, len); |
| return oob + len; |
| |
| case MTD_OOB_AUTO: { |
| struct nand_oobfree *free = chip->ecc.layout->oobfree; |
| uint32_t boffs = 0, roffs = ops->ooboffs; |
| size_t bytes = 0; |
| |
| for(; free->length && len; free++, len -= bytes) { |
| /* Read request not from offset 0 ? */ |
| if (unlikely(roffs)) { |
| if (roffs >= free->length) { |
| roffs -= free->length; |
| continue; |
| } |
| boffs = free->offset + roffs; |
| bytes = min_t(size_t, len, |
| (free->length - roffs)); |
| roffs = 0; |
| } else { |
| bytes = min_t(size_t, len, free->length); |
| boffs = free->offset; |
| } |
| memcpy(oob, chip->oob_poi + boffs, bytes); |
| oob += bytes; |
| } |
| return oob; |
| } |
| default: |
| BUG(); |
| } |
| return NULL; |
| } |
| #endif |
| |
| /** |
| * nand_do_read_ops - [Internal] Read data with ECC |
| * |
| * @mtd: MTD device structure |
| * @from: offset to read from |
| * @ops: oob ops structure |
| * |
| * Internal function. Called with chip held. |
| */ |
| static int nand_do_read_ops(struct mtd_info *mtd, loff_t from, |
| struct mtd_oob_ops *ops) |
| { |
| int chipnr, page, realpage, col, bytes, aligned; |
| struct nand_chip *chip = mtd->priv; |
| struct mtd_ecc_stats stats; |
| int blkcheck = (1 << (chip->phys_erase_shift - chip->page_shift)) - 1; |
| int sndcmd = 1; |
| int ret = 0; |
| uint32_t readlen = ops->len; |
| uint32_t oobreadlen = ops->ooblen; |
| uint8_t *bufpoi, *oob, *buf; |
| |
| stats = mtd->ecc_stats; |
| |
| chipnr = (int)(from >> chip->chip_shift); |
| chip->select_chip(mtd, chipnr); |
| |
| realpage = (int)(from >> chip->page_shift); |
| page = realpage & chip->pagemask; |
| |
| col = (int)(from & (mtd->writesize - 1)); |
| |
| buf = ops->datbuf; |
| oob = ops->oobbuf; |
| |
| while(1) { |
| bytes = min(mtd->writesize - col, readlen); |
| aligned = (bytes == mtd->writesize); |
| |
| /* Is the current page in the buffer ? */ |
| if (realpage != chip->pagebuf || oob) { |
| bufpoi = aligned ? buf : chip->buffers->databuf; |
| |
| if (likely(sndcmd)) { |
| chip->cmdfunc(mtd, NAND_CMD_READ0, 0x00, page); |
| sndcmd = 0; |
| } |
| |
| /* Now read the page into the buffer */ |
| if (unlikely(ops->mode == MTD_OOB_RAW)) |
| ret = chip->ecc.read_page_raw(mtd, chip, bufpoi); |
| else |
| ret = chip->ecc.read_page(mtd, chip, bufpoi); |
| if (ret < 0) |
| break; |
| |
| /* Transfer not aligned data */ |
| if (!aligned) { |
| chip->pagebuf = realpage; |
| memcpy(buf, chip->buffers->databuf + col, bytes); |
| } |
| |
| buf += bytes; |
| |
| #ifdef CONFIG_NAND_READ_OOB |
| if (unlikely(oob)) { |
| /* Raw mode does data:oob:data:oob */ |
| if (ops->mode != MTD_OOB_RAW) { |
| int toread = min(oobreadlen, |
| chip->ecc.layout->oobavail); |
| if (toread) { |
| oob = nand_transfer_oob(chip, |
| oob, ops, toread); |
| oobreadlen -= toread; |
| } |
| } else |
| buf = nand_transfer_oob(chip, |
| buf, ops, mtd->oobsize); |
| } |
| #endif |
| if (!(chip->options & NAND_NO_READRDY)) { |
| /* |
| * Apply delay or wait for ready/busy pin. Do |
| * this before the AUTOINCR check, so no |
| * problems arise if a chip which does auto |
| * increment is marked as NOAUTOINCR by the |
| * board driver. |
| */ |
| if (!chip->dev_ready) |
| udelay(chip->chip_delay); |
| else |
| nand_wait_ready(mtd); |
| } |
| } else { |
| memcpy(buf, chip->buffers->databuf + col, bytes); |
| buf += bytes; |
| } |
| |
| readlen -= bytes; |
| |
| if (!readlen) |
| break; |
| |
| /* For subsequent reads align to page boundary. */ |
| col = 0; |
| /* Increment page address */ |
| realpage++; |
| |
| page = realpage & chip->pagemask; |
| /* Check, if we cross a chip boundary */ |
| if (!page) { |
| chipnr++; |
| chip->select_chip(mtd, -1); |
| chip->select_chip(mtd, chipnr); |
| } |
| |
| /* Check, if the chip supports auto page increment |
| * or if we have hit a block boundary. |
| */ |
| if (!NAND_CANAUTOINCR(chip) || !(page & blkcheck)) |
| sndcmd = 1; |
| #ifdef CONFIG_COMCERTO_TEST_NAND_ECC |
| printf("#"); |
| #endif |
| } |
| |
| #ifdef CONFIG_COMCERTO_TEST_NAND_ECC |
| printf("\n"); |
| #endif |
| ops->retlen = ops->len - (size_t) readlen; |
| if (oob) |
| ops->oobretlen = ops->ooblen - oobreadlen; |
| |
| if (ret) |
| return ret; |
| |
| if (mtd->ecc_stats.failed - stats.failed) |
| return -EBADMSG; |
| |
| return 0; |
| } |
| |
| /** |
| * nand_read - [MTD Interface] MTD compability function for nand_do_read_ecc |
| * @mtd: MTD device structure |
| * @from: offset to read from |
| * @len: number of bytes to read |
| * @retlen: pointer to variable to store the number of read bytes |
| * @buf: the databuffer to put data |
| * |
| * Get hold of the chip and call nand_do_read |
| */ |
| static int nand_read(struct mtd_info *mtd, loff_t from, size_t len, |
| size_t *retlen, uint8_t *buf) |
| { |
| struct nand_chip *chip = mtd->priv; |
| int ret; |
| |
| /* Do not allow reads past end of device */ |
| if ((from + len) > mtd->size) |
| return -EINVAL; |
| if (!len) |
| return 0; |
| |
| chip->ops.len = len; |
| chip->ops.datbuf = buf; |
| chip->ops.oobbuf = NULL; |
| |
| ret = nand_do_read_ops(mtd, from, &chip->ops); |
| |
| *retlen = chip->ops.retlen; |
| |
| return ret; |
| } |
| |
| /** |
| * nand_read_oob_std - [REPLACABLE] the most common OOB data read function |
| * @mtd: mtd info structure |
| * @chip: nand chip info structure |
| * @page: page number to read |
| * @sndcmd: flag whether to issue read command or not |
| */ |
| int nand_read_oob_std(struct mtd_info *mtd, struct nand_chip *chip, |
| int page, int sndcmd) |
| { |
| if (sndcmd) { |
| chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page); |
| sndcmd = 0; |
| } |
| chip->read_buf(mtd, chip->oob_poi, mtd->oobsize); |
| return sndcmd; |
| } |
| |
| /** |
| * nand_do_read_oob - [Intern] NAND read out-of-band |
| * @mtd: MTD device structure |
| * @from: offset to read from |
| * @ops: oob operations description structure |
| * |
| * NAND read out-of-band data from the spare area |
| */ |
| #ifdef CONFIG_NAND_READ_OOB |
| static int nand_do_read_oob(struct mtd_info *mtd, loff_t from, |
| struct mtd_oob_ops *ops) |
| { |
| int page, realpage, chipnr, sndcmd = 1; |
| struct nand_chip *chip = mtd->priv; |
| int blkcheck = (1 << (chip->phys_erase_shift - chip->page_shift)) - 1; |
| int readlen = ops->ooblen; |
| int len; |
| uint8_t *buf = ops->oobbuf; |
| |
| MTD_DEBUG(MTD_DEBUG_LEVEL3, "nand_read_oob: from = 0x%08Lx, len = %i\n", |
| (unsigned long long)from, readlen); |
| |
| if (ops->mode == MTD_OOB_AUTO) |
| len = chip->ecc.layout->oobavail; |
| else |
| len = mtd->oobsize; |
| |
| if (unlikely(ops->ooboffs >= len)) { |
| MTD_DEBUG(MTD_DEBUG_LEVEL0, "nand_read_oob: " |
| "Attempt to start read outside oob\n"); |
| return -EINVAL; |
| } |
| |
| /* Do not allow reads past end of device */ |
| if (unlikely(from >= mtd->size || |
| ops->ooboffs + readlen > ((mtd->size >> chip->page_shift) - |
| (from >> chip->page_shift)) * len)) { |
| MTD_DEBUG(MTD_DEBUG_LEVEL0, "nand_read_oob: " |
| "Attempt read beyond end of device\n"); |
| return -EINVAL; |
| } |
| |
| chipnr = (int)(from >> chip->chip_shift); |
| chip->select_chip(mtd, chipnr); |
| |
| /* Shift to get page */ |
| realpage = (int)(from >> chip->page_shift); |
| page = realpage & chip->pagemask; |
| |
| while(1) { |
| sndcmd = chip->ecc.read_oob(mtd, chip, page, sndcmd); |
| |
| len = min(len, readlen); |
| buf = nand_transfer_oob(chip, buf, ops, len); |
| |
| if (!(chip->options & NAND_NO_READRDY)) { |
| /* |
| * Apply delay or wait for ready/busy pin. Do this |
| * before the AUTOINCR check, so no problems arise if a |
| * chip which does auto increment is marked as |
| * NOAUTOINCR by the board driver. |
| */ |
| if (!chip->dev_ready) |
| udelay(chip->chip_delay); |
| else |
| nand_wait_ready(mtd); |
| } |
| |
| readlen -= len; |
| if (!readlen) |
| break; |
| |
| /* Increment page address */ |
| realpage++; |
| |
| page = realpage & chip->pagemask; |
| /* Check, if we cross a chip boundary */ |
| if (!page) { |
| chipnr++; |
| chip->select_chip(mtd, -1); |
| chip->select_chip(mtd, chipnr); |
| } |
| |
| /* Check, if the chip supports auto page increment |
| * or if we have hit a block boundary. |
| */ |
| if (!NAND_CANAUTOINCR(chip) || !(page & blkcheck)) |
| sndcmd = 1; |
| } |
| |
| ops->oobretlen = ops->ooblen; |
| return 0; |
| } |
| |
| /** |
| * nand_read_oob - [MTD Interface] NAND read data and/or out-of-band |
| * @mtd: MTD device structure |
| * @from: offset to read from |
| * @ops: oob operation description structure |
| * |
| * NAND read data and/or out-of-band data |
| */ |
| static int nand_read_oob(struct mtd_info *mtd, loff_t from, |
| struct mtd_oob_ops *ops) |
| { |
| int ret = -ENOSYS; |
| |
| ops->retlen = 0; |
| |
| /* Do not allow reads past end of device */ |
| if (ops->datbuf && (from + ops->len) > mtd->size) { |
| MTD_DEBUG(MTD_DEBUG_LEVEL0, "nand_read_oob: " |
| "Attempt read beyond end of device\n"); |
| return -EINVAL; |
| } |
| |
| switch(ops->mode) { |
| case MTD_OOB_PLACE: |
| case MTD_OOB_AUTO: |
| case MTD_OOB_RAW: |
| break; |
| |
| default: |
| goto out; |
| } |
| |
| if (!ops->datbuf) |
| ret = nand_do_read_oob(mtd, from, ops); |
| else |
| ret = nand_do_read_ops(mtd, from, ops); |
| |
| out: |
| return ret; |
| } |
| #endif |
| |
| /** |
| * nand_block_isbad - [MTD Interface] Check if block at offset is bad |
| * @mtd: MTD device structure |
| * @offs: offset relative to mtd start |
| */ |
| int nand_block_isbad(struct mtd_info *mtd, loff_t offs) |
| { |
| /* Check for invalid offset */ |
| if (offs > mtd->size) |
| return -EINVAL; |
| |
| return nand_block_checkbad(mtd, offs, 1, 0); |
| } |
| |
| /** |
| * nand_read_subpage - [REPLACEABLE] software ECC based sub-page read function |
| * @mtd: mtd info structure |
| * @chip: nand chip info structure |
| * @data_offs: offset of requested data within the page |
| * @readlen: data length |
| * @bufpoi: buffer to store read data |
| */ |
| static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip, |
| uint32_t data_offs, uint32_t readlen, uint8_t *bufpoi) |
| { |
| int start_step, end_step, num_steps; |
| uint32_t *eccpos = chip->ecc.layout->eccpos; |
| uint8_t *p; |
| int data_col_addr, i, gaps = 0; |
| int datafrag_len, eccfrag_len, aligned_len, aligned_pos; |
| int busw = (chip->options & NAND_BUSWIDTH_16) ? 2 : 1; |
| int index = 0; |
| |
| /* Column address within the page aligned to ECC size (256bytes) */ |
| start_step = data_offs / chip->ecc.size; |
| end_step = (data_offs + readlen - 1) / chip->ecc.size; |
| num_steps = end_step - start_step + 1; |
| |
| /* Data size aligned to ECC ecc.size */ |
| datafrag_len = num_steps * chip->ecc.size; |
| eccfrag_len = num_steps * chip->ecc.bytes; |
| |
| data_col_addr = start_step * chip->ecc.size; |
| /* If we read not a page aligned data */ |
| if (data_col_addr != 0) |
| chip->cmdfunc(mtd, NAND_CMD_RNDOUT, data_col_addr, -1); |
| |
| p = bufpoi + data_col_addr; |
| chip->read_buf(mtd, p, datafrag_len); |
| |
| /* Calculate ECC */ |
| for (i = 0; i < eccfrag_len ; i += chip->ecc.bytes, p += chip->ecc.size) |
| chip->ecc.calculate(mtd, p, &chip->buffers->ecccalc[i]); |
| |
| /* |
| * The performance is faster if we position offsets according to |
| * ecc.pos. Let's make sure that there are no gaps in ECC positions. |
| */ |
| for (i = 0; i < eccfrag_len - 1; i++) { |
| if (eccpos[i + start_step * chip->ecc.bytes] + 1 != |
| eccpos[i + start_step * chip->ecc.bytes + 1]) { |
| gaps = 1; |
| break; |
| } |
| } |
| if (gaps) { |
| chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize, -1); |
| chip->read_buf(mtd, chip->oob_poi, mtd->oobsize); |
| } else { |
| /* |
| * Send the command to read the particular ECC bytes take care |
| * about buswidth alignment in read_buf. |
| */ |
| index = start_step * chip->ecc.bytes; |
| |
| aligned_pos = eccpos[index] & ~(busw - 1); |
| aligned_len = eccfrag_len; |
| if (eccpos[index] & (busw - 1)) |
| aligned_len++; |
| if (eccpos[index + (num_steps * chip->ecc.bytes)] & (busw - 1)) |
| aligned_len++; |
| |
| chip->cmdfunc(mtd, NAND_CMD_RNDOUT, |
| mtd->writesize + aligned_pos, -1); |
| chip->read_buf(mtd, &chip->oob_poi[aligned_pos], aligned_len); |
| } |
| |
| for (i = 0; i < eccfrag_len; i++) |
| chip->buffers->ecccode[i] = chip->oob_poi[eccpos[i + index]]; |
| |
| p = bufpoi + data_col_addr; |
| for (i = 0; i < eccfrag_len ; i += chip->ecc.bytes, p += chip->ecc.size) { |
| int stat; |
| |
| stat = chip->ecc.correct(mtd, p, |
| &chip->buffers->ecccode[i], &chip->buffers->ecccalc[i]); |
| if (stat < 0) |
| mtd->ecc_stats.failed++; |
| else |
| mtd->ecc_stats.corrected += stat; |
| } |
| return 0; |
| } |
| |
| |
| /* |
| * Set default functions |
| */ |
| static void nand_set_defaults(struct nand_chip *chip, int busw) |
| { |
| /* check for proper chip_delay setup, set 20us if not */ |
| if (!chip->chip_delay) |
| chip->chip_delay = 20; |
| |
| /* check, if a user supplied command function given */ |
| if (chip->cmdfunc == NULL) |
| chip->cmdfunc = nand_command; |
| |
| /* check, if a user supplied wait function given */ |
| if (chip->waitfunc == NULL) |
| chip->waitfunc = nand_wait; |
| |
| if (!chip->select_chip) |
| chip->select_chip = nand_select_chip; |
| if (!chip->read_byte) |
| chip->read_byte = busw ? nand_read_byte16 : nand_read_byte; |
| if (!chip->read_word) |
| chip->read_word = nand_read_word; |
| if (!chip->block_bad) |
| chip->block_bad = nand_block_bad; |
| #ifdef CONFIG_NAND_WRITE |
| if (!chip->block_markbad) |
| chip->block_markbad = nand_default_block_markbad; |
| if (!chip->write_buf) |
| chip->write_buf = busw ? nand_write_buf16 : nand_write_buf; |
| #endif |
| if (!chip->read_buf) |
| chip->read_buf = busw ? nand_read_buf16 : nand_read_buf; |
| |
| if (!chip->verify_buf) |
| chip->verify_buf = busw ? nand_verify_buf16 : nand_verify_buf; |
| |
| #ifdef CONFIG_NAND_BBT |
| if (!chip->scan_bbt) |
| chip->scan_bbt = nand_default_bbt; |
| #endif |
| if (!chip->controller) { |
| chip->controller = &chip->hwcontrol; |
| } |
| |
| } |
| |
| /* |
| * sanitize ONFI strings so we can safely print them |
| */ |
| static void sanitize_string(char *s, size_t len) |
| { |
| ssize_t i; |
| |
| /* null terminate */ |
| s[len - 1] = 0; |
| |
| /* remove non printable chars */ |
| for (i = 0; i < len - 1; i++) { |
| if (s[i] < ' ' || s[i] > 127) |
| s[i] = '?'; |
| } |
| |
| /* remove trailing spaces */ |
| strim(s); |
| } |
| |
| static u16 onfi_crc16(u16 crc, u8 const *p, size_t len) |
| { |
| int i; |
| while (len--) { |
| crc ^= *p++ << 8; |
| for (i = 0; i < 8; i++) |
| crc = (crc << 1) ^ ((crc & 0x8000) ? 0x8005 : 0); |
| } |
| |
| return crc; |
| } |
| |
| /* |
| * Check if the NAND chip is ONFI compliant, returns 1 if it is, 0 otherwise |
| */ |
| static int nand_flash_detect_onfi(struct mtd_info *mtd, struct nand_chip *chip, |
| int *busw) |
| { |
| struct nand_onfi_params *p = &chip->onfi_params; |
| int i; |
| int val; |
| |
| /* try ONFI for unknow chip or LP */ |
| chip->cmdfunc(mtd, NAND_CMD_READID, 0x20, -1); |
| if (chip->read_byte(mtd) != 'O' || chip->read_byte(mtd) != 'N' || |
| chip->read_byte(mtd) != 'F' || chip->read_byte(mtd) != 'I') |
| return 0; |
| |
| printk(KERN_INFO "ONFI flash detected ... "); |
| chip->cmdfunc(mtd, NAND_CMD_PARAM, 0, -1); |
| for (i = 0; i < 3; i++) { |
| chip->read_buf(mtd, (uint8_t *)p, sizeof(*p)); |
| if (onfi_crc16(ONFI_CRC_BASE, (uint8_t *)p, 254) == |
| le16_to_cpu(p->crc)) { |
| printk(KERN_INFO "ONFI param page %d valid\n", i); |
| break; |
| } |
| } |
| |
| if (i == 3) { |
| printk(KERN_INFO "no valid ONFI param page found\n"); |
| return 0; |
| } |
| |
| /* check version */ |
| val = le16_to_cpu(p->revision); |
| if (val & (1 << 5)) |
| chip->onfi_version = 23; |
| else if (val & (1 << 4)) |
| chip->onfi_version = 22; |
| else if (val & (1 << 3)) |
| chip->onfi_version = 21; |
| else if (val & (1 << 2)) |
| chip->onfi_version = 20; |
| else if (val & (1 << 1)) |
| chip->onfi_version = 10; |
| else |
| chip->onfi_version = 0; |
| |
| if (!chip->onfi_version) { |
| printk(KERN_INFO "unsupported ONFI version: %d\n", val); |
| return 0; |
| } |
| |
| sanitize_string(p->manufacturer, sizeof(p->manufacturer)); |
| sanitize_string(p->model, sizeof(p->model)); |
| if (!mtd->name) |
| mtd->name = p->model; |
| mtd->writesize = le32_to_cpu(p->byte_per_page); |
| mtd->erasesize = le32_to_cpu(p->pages_per_block) * mtd->writesize; |
| mtd->oobsize = le16_to_cpu(p->spare_bytes_per_page); |
| chip->chipsize = (uint64_t)le32_to_cpu(p->blocks_per_lun) * mtd->erasesize; |
| *busw = 0; |
| if (le16_to_cpu(p->features) & 1) |
| *busw = NAND_BUSWIDTH_16; |
| |
| chip->options &= ~NAND_CHIPOPTIONS_MSK; |
| chip->options |= NAND_NO_READRDY & NAND_CHIPOPTIONS_MSK; |
| |
| return 1; |
| } |
| |
| /* |
| * Get the flash and manufacturer id and lookup if the type is supported |
| */ |
| static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd, |
| struct nand_chip *chip, |
| int busw, int *maf_id) |
| { |
| struct nand_flash_dev *type = NULL; |
| int i, dev_id, maf_idx; |
| int tmp_id, tmp_manf; |
| int ret; |
| |
| /* Select the device */ |
| chip->select_chip(mtd, 0); |
| |
| /* |
| * Reset the chip, required by some chips (e.g. Micron MT29FxGxxxxx) |
| * after power-up |
| */ |
| chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1); |
| |
| /* Send the command for reading device ID */ |
| chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1); |
| |
| /* Read manufacturer and device IDs */ |
| *maf_id = chip->read_byte(mtd); |
| dev_id = chip->read_byte(mtd); |
| |
| /* Try again to make sure, as some systems the bus-hold or other |
| * interface concerns can cause random data which looks like a |
| * possibly credible NAND flash to appear. If the two results do |
| * not match, ignore the device completely. |
| */ |
| |
| chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1); |
| |
| /* Read manufacturer and device IDs */ |
| |
| tmp_manf = chip->read_byte(mtd); |
| tmp_id = chip->read_byte(mtd); |
| |
| if (tmp_manf != *maf_id || tmp_id != dev_id) { |
| printk(KERN_ERR "%s: second ID read did not match " |
| "%02x,%02x against %02x,%02x\n", __func__, |
| *maf_id, dev_id, tmp_manf, tmp_id); |
| return ERR_PTR(-ENODEV); |
| } |
| |
| /* Lookup the flash id */ |
| for (i = 0; nand_flash_ids[i].name != NULL; i++) { |
| if (dev_id == nand_flash_ids[i].id) { |
| type = &nand_flash_ids[i]; |
| break; |
| } |
| } |
| |
| chip->onfi_version = 0; |
| if (!type) { |
| /* Check is chip is ONFI compliant */ |
| ret = nand_flash_detect_onfi(mtd, chip, &busw); |
| if (ret) |
| goto ident_done; |
| else { |
| printk(KERN_ERR "NAND type unknown: %02x,%02x\n", *maf_id, dev_id); |
| return ERR_PTR(-ENODEV); |
| } |
| } |
| |
| if (!mtd->name) |
| mtd->name = type->name; |
| |
| chip->chipsize = type->chipsize << 20; |
| |
| /* Newer devices have all the information in additional id bytes */ |
| if (!type->pagesize) { |
| int extid; |
| /* The 3rd id byte holds MLC / multichip data */ |
| chip->cellinfo = chip->read_byte(mtd); |
| /* The 4th id byte is the important one */ |
| extid = chip->read_byte(mtd); |
| /* Calc pagesize */ |
| mtd->writesize = 1024 << (extid & 0x3); |
| extid >>= 2; |
| /* Calc oobsize */ |
| mtd->oobsize = (8 << (extid & 0x01)) * (mtd->writesize >> 9); |
| extid >>= 2; |
| /* Calc blocksize. Blocksize is multiples of 64KiB */ |
| mtd->erasesize = (64 * 1024) << (extid & 0x03); |
| extid >>= 2; |
| /* Get buswidth information */ |
| busw = (extid & 0x01) ? NAND_BUSWIDTH_16 : 0; |
| |
| } else { |
| /* |
| * Old devices have chip data hardcoded in the device id table |
| */ |
| mtd->erasesize = type->erasesize; |
| mtd->writesize = type->pagesize; |
| mtd->oobsize = mtd->writesize / 32; |
| busw = type->options & NAND_BUSWIDTH_16; |
| } |
| |
| /* Try to identify manufacturer */ |
| for (maf_idx = 0; nand_manuf_ids[maf_idx].id != 0x0; maf_idx++) { |
| if (nand_manuf_ids[maf_idx].id == *maf_id) |
| break; |
| } |
| |
| /* Get chip options, preserve non chip based options */ |
| chip->options &= ~NAND_CHIPOPTIONS_MSK; |
| chip->options |= type->options & NAND_CHIPOPTIONS_MSK; |
| |
| /* Check if chip is a not a samsung device. Do not clear the |
| * options for chips which are not having an extended id. |
| */ |
| if (*maf_id != NAND_MFR_SAMSUNG && !type->pagesize) |
| chip->options &= ~NAND_SAMSUNG_LP_OPTIONS; |
| |
| ident_done: |
| /* |
| * Set chip as a default. Board drivers can override it, if necessary |
| */ |
| chip->options |= NAND_NO_AUTOINCR; |
| |
| /* Try to identify manufacturer */ |
| for (maf_idx = 0; nand_manuf_ids[maf_idx].id != 0x0; maf_idx++) { |
| if (nand_manuf_ids[maf_idx].id == *maf_id) |
| break; |
| } |
| |
| /* |
| * Check, if buswidth is correct. Hardware drivers should set |
| * chip correct ! |
| */ |
| if (busw != (chip->options & NAND_BUSWIDTH_16)) { |
| printk(KERN_INFO "NAND device: Manufacturer ID:" |
| " 0x%02x, Chip ID: 0x%02x (%s %s)\n", *maf_id, |
| dev_id, nand_manuf_ids[maf_idx].name, mtd->name); |
| printk(KERN_WARNING "NAND bus width %d instead %d bit\n", |
| (chip->options & NAND_BUSWIDTH_16) ? 16 : 8, |
| busw ? 16 : 8); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| /* Calculate the address shift from the page size */ |
| chip->page_shift = ffs(mtd->writesize) - 1; |
| /* Convert chipsize to number of pages per chip -1. */ |
| chip->pagemask = (chip->chipsize >> chip->page_shift) - 1; |
| |
| chip->bbt_erase_shift = chip->phys_erase_shift = |
| ffs(mtd->erasesize) - 1; |
| if (chip->chipsize & 0xffffffff) |
| chip->chip_shift = ffs((unsigned)chip->chipsize) - 1; |
| else { |
| chip->chip_shift = ffs((unsigned)(chip->chipsize >> 32)); |
| chip->chip_shift += 32 - 1; |
| } |
| |
| /* Set the bad block position */ |
| chip->badblockpos = mtd->writesize > 512 ? |
| NAND_LARGE_BADBLOCK_POS : NAND_SMALL_BADBLOCK_POS; |
| |
| #ifdef CONFIG_NAND_WRITE |
| /* Check for AND chips with 4 page planes */ |
| if (chip->options & NAND_4PAGE_ARRAY) |
| chip->erase_cmd = multi_erase_cmd; |
| else |
| chip->erase_cmd = single_erase_cmd; |
| #endif |
| |
| /* Do not replace user supplied command function ! */ |
| if (mtd->writesize > 512 && chip->cmdfunc == nand_command) |
| chip->cmdfunc = nand_command_lp; |
| |
| printk("NAND device: Manufacturer ID: 0x%02x, Chip ID: 0x%02x (%s %s)," |
| " page size: %d, OOB size: %d\n", |
| *maf_id, dev_id, nand_manuf_ids[maf_idx].name, |
| chip->onfi_version ? chip->onfi_params.model : type->name, |
| mtd->writesize, mtd->oobsize); |
| |
| return type; |
| } |
| |
| /** |
| * nand_scan_ident - [NAND Interface] Scan for the NAND device |
| * @mtd: MTD device structure |
| * @maxchips: Number of chips to scan for |
| * |
| * This is the first phase of the normal nand_scan() function. It |
| * reads the flash ID and sets up MTD fields accordingly. |
| * |
| * The mtd->owner field must be set to the module of the caller. |
| */ |
| int nand_scan_ident(struct mtd_info *mtd, int maxchips) |
| { |
| int i, busw, nand_maf_id; |
| struct nand_chip *chip = mtd->priv; |
| struct nand_flash_dev *type; |
| |
| /* Get buswidth to select the correct functions */ |
| busw = chip->options & NAND_BUSWIDTH_16; |
| /* Set the default functions */ |
| nand_set_defaults(chip, busw); |
| |
| /* Read the flash type */ |
| type = nand_get_flash_type(mtd, chip, busw, &nand_maf_id); |
| |
| if (IS_ERR(type)) { |
| printk(KERN_WARNING "No NAND device found!!!\n"); |
| chip->select_chip(mtd, -1); |
| return PTR_ERR(type); |
| } |
| |
| /* Check for a chip array */ |
| for (i = 1; i < maxchips; i++) { |
| chip->select_chip(mtd, i); |
| /* Send the command for reading device ID */ |
| chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1); |
| /* Read manufacturer and device IDs */ |
| if (nand_maf_id != chip->read_byte(mtd) || |
| type->id != chip->read_byte(mtd)) |
| break; |
| } |
| if (i > 1) |
| printk(KERN_INFO "%d NAND chips detected\n", i); |
| |
| /* Store the number of chips and calc total size for mtd */ |
| chip->numchips = i; |
| mtd->size = i * chip->chipsize; |
| |
| return 0; |
| } |
| |
| static void __maybe_unused nand_check_hwecc(struct mtd_info *mtd, struct nand_chip *chip) |
| { |
| if ((!chip->ecc.calculate || !chip->ecc.correct || |
| !chip->ecc.hwctl) && |
| (!chip->ecc.read_page || !chip->ecc.write_page)) { |
| printk(KERN_WARNING "No ECC functions supplied, " |
| "Hardware ECC not possible\n"); |
| BUG(); |
| } |
| |
| if (mtd->writesize < chip->ecc.size) { |
| printk(KERN_WARNING "%d byte HW ECC not possible on " |
| "%d byte page size\n", |
| chip->ecc.size, mtd->writesize); |
| BUG(); |
| } |
| } |
| |
| /** |
| * nand_scan_tail - [NAND Interface] Scan for the NAND device |
| * @mtd: MTD device structure |
| * @maxchips: Number of chips to scan for |
| * |
| * This is the second phase of the normal nand_scan() function. It |
| * fills out all the uninitialized function pointers with the defaults |
| * and scans for a bad block table if appropriate. |
| */ |
| int nand_scan_tail(struct mtd_info *mtd) |
| { |
| int i; |
| struct nand_chip *chip = mtd->priv; |
| |
| if (!(chip->options & NAND_OWN_BUFFERS)) |
| chip->buffers = kmalloc(sizeof(*chip->buffers), GFP_KERNEL); |
| if (!chip->buffers) |
| return -ENOMEM; |
| |
| /* Set the internal oob buffer location, just after the page data */ |
| chip->oob_poi = chip->buffers->databuf + mtd->writesize; |
| |
| |
| /* |
| * If no default placement scheme is given, select an appropriate one |
| */ |
| if (!chip->ecc.layout && (chip->ecc.mode != NAND_ECC_SOFT_BCH)) { |
| switch (mtd->oobsize) { |
| case 8: |
| chip->ecc.layout = &nand_oob_8; |
| break; |
| case 16: |
| chip->ecc.layout = &nand_oob_16; |
| break; |
| case 64: |
| chip->ecc.layout = &nand_oob_64; |
| break; |
| case 128: |
| chip->ecc.layout = &nand_oob_128; |
| break; |
| case 224: |
| chip->ecc.layout = &nand_oob_128; |
| break; |
| default: |
| printk(KERN_WARNING "No oob scheme defined for " |
| "oobsize %d\n", mtd->oobsize); |
| BUG(); |
| } |
| } |
| |
| #ifdef CONFIG_NAND_WRITE |
| if (!chip->write_page) |
| chip->write_page = nand_write_page; |
| #endif |
| |
| /* |
| * check ECC mode, default to software if 3byte/512byte hardware ECC is |
| * selected and we have 256 byte pagesize fallback to software ECC |
| */ |
| if (!chip->ecc.read_page_raw) |
| chip->ecc.read_page_raw = nand_read_page_raw; |
| #ifdef CONFIG_NAND_WRITE |
| if (!chip->ecc.write_page_raw) |
| chip->ecc.write_page_raw = nand_write_page_raw; |
| #endif |
| switch (chip->ecc.mode) { |
| #ifdef CONFIG_NAND_ECC_HW |
| case NAND_ECC_HW: |
| nand_check_hwecc(mtd, chip); |
| nand_init_ecc_hw(chip); |
| break; |
| #endif |
| #ifdef CONFIG_NAND_ECC_HW_SYNDROME |
| case NAND_ECC_HW_SYNDROME: |
| nand_check_hwecc(mtd, chip); |
| nand_init_ecc_hw_syndrome(chip); |
| break; |
| #endif |
| #ifdef CONFIG_NAND_ECC_SOFT |
| case NAND_ECC_SOFT: |
| nand_init_ecc_soft(chip); |
| break; |
| #endif |
| |
| case NAND_ECC_SOFT_BCH: |
| if (!mtd_nand_has_bch()) { |
| pr_warn("CONFIG_MTD_ECC_BCH not enabled\n"); |
| BUG(); |
| } |
| chip->ecc.calculate = nand_bch_calculate_ecc; |
| chip->ecc.correct = nand_bch_correct_data; |
| chip->ecc.read_page = nand_read_page_swecc; |
| chip->ecc.read_subpage = nand_read_subpage; |
| #ifdef CONFIG_NAND_WRITE |
| chip->ecc.write_page_raw = nand_write_page_raw; |
| chip->ecc.write_page = nand_write_page_swecc; |
| chip->ecc.write_oob = nand_write_oob_std; |
| #endif |
| chip->ecc.read_oob = nand_read_oob_std; |
| chip->ecc.read_page_raw = nand_read_page_raw; |
| /* |
| * Board driver should supply ecc.size and ecc.bytes values to |
| * select how many bits are correctable; see nand_bch_init() |
| * for details. Otherwise, default to 4 bits for large page |
| * devices. |
| */ |
| if (!chip->ecc.size && (mtd->oobsize >= 64)) { |
| chip->ecc.size = 512; |
| chip->ecc.bytes = 7; |
| } |
| chip->ecc.priv = nand_bch_init(mtd, |
| chip->ecc.size, |
| chip->ecc.bytes, |
| &chip->ecc.layout); |
| if (!chip->ecc.priv) { |
| pr_warn("BCH ECC initialization failed!\n"); |
| BUG(); |
| } |
| break; |
| |
| |
| #ifdef CONFIG_NAND_ECC_NONE |
| case NAND_ECC_NONE: |
| printk(KERN_WARNING "NAND_ECC_NONE selected by board driver. " |
| "This is not recommended !!\n"); |
| chip->ecc.read_page = nand_read_page_raw; |
| #ifdef CONFIG_NAND_WRITE |
| chip->ecc.write_page = nand_write_page_raw; |
| chip->ecc.write_oob = nand_write_oob_std; |
| #endif |
| chip->ecc.read_oob = nand_read_oob_std; |
| chip->ecc.size = mtd->writesize; |
| chip->ecc.bytes = 0; |
| break; |
| #endif |
| default: |
| printk(KERN_WARNING "Invalid NAND_ECC_MODE %d\n", |
| chip->ecc.mode); |
| BUG(); |
| } |
| |
| /* |
| * The number of bytes available for a client to place data into |
| * the out of band area |
| */ |
| chip->ecc.layout->oobavail = 0; |
| for (i = 0; chip->ecc.layout->oobfree[i].length; i++) |
| chip->ecc.layout->oobavail += |
| chip->ecc.layout->oobfree[i].length; |
| mtd->oobavail = chip->ecc.layout->oobavail; |
| |
| /* |
| * Set the number of read / write steps for one page depending on ECC |
| * mode |
| */ |
| chip->ecc.steps = mtd->writesize / chip->ecc.size; |
| if(chip->ecc.steps * chip->ecc.size != mtd->writesize) { |
| printk(KERN_WARNING "Invalid ecc parameters\n"); |
| BUG(); |
| } |
| chip->ecc.total = chip->ecc.steps * chip->ecc.bytes; |
| |
| /* |
| * Allow subpage writes up to ecc.steps. Not possible for MLC |
| * FLASH. |
| */ |
| if (!(chip->options & NAND_NO_SUBPAGE_WRITE) && |
| !(chip->cellinfo & NAND_CI_CELLTYPE_MSK)) { |
| switch(chip->ecc.steps) { |
| case 2: |
| mtd->subpage_sft = 1; |
| break; |
| case 4: |
| case 8: |
| mtd->subpage_sft = 2; |
| break; |
| } |
| } |
| chip->subpagesize = mtd->writesize >> mtd->subpage_sft; |
| |
| /* Initialize state */ |
| chip->state = FL_READY; |
| |
| /* De-select the device */ |
| chip->select_chip(mtd, -1); |
| |
| /* Invalidate the pagebuffer reference */ |
| chip->pagebuf = -1; |
| |
| /* Fill in remaining MTD driver data */ |
| mtd->type = MTD_NANDFLASH; |
| mtd->flags = MTD_CAP_NANDFLASH; |
| #ifdef CONFIG_NAND_WRITE |
| mtd->erase = nand_erase; |
| mtd->write = nand_write; |
| mtd->write_oob = nand_write_oob; |
| #endif |
| mtd->read = nand_read; |
| #ifdef CONFIG_NAND_READ_OOB |
| mtd->read_oob = nand_read_oob; |
| #endif |
| mtd->lock = NULL; |
| mtd->unlock = NULL; |
| mtd->block_isbad = nand_block_isbad; |
| #ifdef CONFIG_NAND_WRITE |
| mtd->block_markbad = nand_block_markbad; |
| #endif |
| /* propagate ecc.layout to mtd_info */ |
| mtd->ecclayout = chip->ecc.layout; |
| |
| /* Check, if we should skip the bad block table scan */ |
| if (chip->options & NAND_SKIP_BBTSCAN) |
| return 0; |
| #ifdef CONFIG_NAND_BBT |
| /* Build bad block table */ |
| return chip->scan_bbt(mtd); |
| #else |
| return 0; |
| #endif |
| } |
| |
| /** |
| * nand_scan - [NAND Interface] Scan for the NAND device |
| * @mtd: MTD device structure |
| * @maxchips: Number of chips to scan for |
| * |
| * This fills out all the uninitialized function pointers |
| * with the defaults. |
| * The flash ID is read and the mtd/chip structures are |
| * filled with the appropriate values. |
| * The mtd->owner field must be set to the module of the caller |
| * |
| */ |
| int nand_scan(struct mtd_info *mtd, int maxchips) |
| { |
| int ret; |
| |
| ret = nand_scan_ident(mtd, maxchips); |
| if (!ret) |
| ret = nand_scan_tail(mtd); |
| return ret; |
| } |
| |
| /** |
| * nand_release - [NAND Interface] Free resources held by the NAND device |
| * @mtd: MTD device structure |
| */ |
| void nand_release(struct mtd_info *mtd) |
| { |
| struct nand_chip *chip = mtd->priv; |
| |
| if (chip->ecc.mode == NAND_ECC_SOFT_BCH) |
| nand_bch_free((struct nand_bch_control *)chip->ecc.priv); |
| |
| |
| /* Deregister the device */ |
| del_mtd_device(mtd); |
| |
| /* Free bad block table memory */ |
| kfree(chip->bbt); |
| if (!(chip->options & NAND_OWN_BUFFERS)) |
| kfree(chip->buffers); |
| } |
| |
| EXPORT_SYMBOL(nand_scan); |
| EXPORT_SYMBOL(nand_scan_ident); |
| EXPORT_SYMBOL(nand_scan_tail); |
| EXPORT_SYMBOL(nand_release); |
| |
| #endif /* DOXYGEN_SHOULD_SKIP_THIS */ |