diff options
Diffstat (limited to 'drivers/mtd/nand/nand_base.c')
| -rw-r--r-- | drivers/mtd/nand/nand_base.c | 4002 |
1 files changed, 0 insertions, 4002 deletions
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c deleted file mode 100644 index 6b7d01919c..0000000000 --- a/drivers/mtd/nand/nand_base.c +++ /dev/null @@ -1,4002 +0,0 @@ -/* - * 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. - * - * 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. - * 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. - * - */ - -#define pr_fmt(fmt) "nand: " fmt - -#include <common.h> -#include <errno.h> -#include <clock.h> -#include <linux/mtd/mtd.h> -#include <linux/mtd/nand.h> -#include <linux/mtd/nand_bch.h> -#include <linux/mtd/nand_ecc.h> -#include <linux/err.h> -#include <asm/byteorder.h> -#include <io.h> -#include <malloc.h> -#include <module.h> -#include <of_mtd.h> - -/* 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} } -}; - -static int nand_get_device(struct mtd_info *mtd, int new_state); - -static int nand_do_write_oob(struct mtd_info *mtd, loff_t to, - struct mtd_oob_ops *ops); - -static int check_offs_len(struct mtd_info *mtd, - loff_t ofs, uint64_t len) -{ - struct nand_chip *chip = mtd_to_nand(mtd); - int ret = 0; - - /* Start address must align on block boundary */ - if (ofs & ((1 << chip->phys_erase_shift) - 1)) { - pr_debug("%s: unaligned address\n", __func__); - ret = -EINVAL; - } - - /* Length must align on block boundary */ - if (len & ((1 << chip->phys_erase_shift) - 1)) { - pr_debug("%s: length not block aligned\n", __func__); - ret = -EINVAL; - } - - return ret; -} - -/** - * nand_release_device - [GENERIC] release chip - * @mtd: MTD device structure - * - * Release chip lock and wake up anyone waiting on the device. - */ -static void nand_release_device(struct mtd_info *mtd) -{ - struct nand_chip *chip = mtd_to_nand(mtd); - - /* Release the controller and the chip */ - chip->controller->active = NULL; - chip->state = FL_READY; -} - -/** - * nand_read_byte - [DEFAULT] read one byte from the chip - * @mtd: MTD device structure - * - * Default read function for 8bit buswidth - */ -static uint8_t nand_read_byte(struct mtd_info *mtd) -{ - struct nand_chip *chip = mtd_to_nand(mtd); - return readb(chip->IO_ADDR_R); -} - -/** - * nand_read_byte16 - [DEFAULT] read one byte endianness aware from the chip - * nand_read_byte16 - [DEFAULT] read one byte endianness aware from the chip - * @mtd: MTD device structure - * - * Default read function for 16bit buswidth with endianness conversion. - * - */ -static uint8_t nand_read_byte16(struct mtd_info *mtd) -{ - struct nand_chip *chip = mtd_to_nand(mtd); - 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 buswidth without endianness conversion. - */ -static u16 nand_read_word(struct mtd_info *mtd) -{ - struct nand_chip *chip = mtd_to_nand(mtd); - 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_to_nand(mtd); - - switch (chipnr) { - case -1: - chip->cmd_ctrl(mtd, NAND_CMD_NONE, 0 | NAND_CTRL_CHANGE); - break; - case 0: - break; - - default: - BUG(); - } -} - -/** - * nand_write_buf - [DEFAULT] write buffer to chip - * @mtd: MTD device structure - * @buf: data buffer - * @len: number of bytes to write - * - * Default write function for 8bit buswidth. - */ -static __maybe_unused void nand_write_buf(struct mtd_info *mtd, - const uint8_t *buf, int len) -{ - int i; - struct nand_chip *chip = mtd_to_nand(mtd); - - for (i = 0; i < len; i++) - writeb(buf[i], chip->IO_ADDR_W); -} - -/** - * 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 buswidth. - */ -static void nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len) -{ - int i; - struct nand_chip *chip = mtd_to_nand(mtd); - - for (i = 0; i < len; i++) - buf[i] = readb(chip->IO_ADDR_R); -} - -/** - * nand_write_buf16 - [DEFAULT] write buffer to chip - * @mtd: MTD device structure - * @buf: data buffer - * @len: number of bytes to write - * - * Default write function for 16bit buswidth. - */ -static __maybe_unused void nand_write_buf16(struct mtd_info *mtd, - const uint8_t *buf, int len) -{ - int i; - struct nand_chip *chip = mtd_to_nand(mtd); - u16 *p = (u16 *) buf; - len >>= 1; - - for (i = 0; i < len; i++) - writew(p[i], chip->IO_ADDR_W); - -} - -/** - * 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 buswidth. - */ -static void nand_read_buf16(struct mtd_info *mtd, uint8_t *buf, int len) -{ - int i; - struct nand_chip *chip = mtd_to_nand(mtd); - u16 *p = (u16 *) buf; - len >>= 1; - - for (i = 0; i < len; i++) - p[i] = readw(chip->IO_ADDR_R); -} - -/** - * 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, i = 0; - struct nand_chip *chip = mtd_to_nand(mtd); - u16 bad; - - if (chip->bbt_options & NAND_BBT_SCANLASTPAGE) - ofs += mtd->erasesize - mtd->writesize; - - page = (int)(ofs >> chip->page_shift) & chip->pagemask; - - if (getchip) { - chipnr = (int)(ofs >> chip->chip_shift); - - nand_get_device(mtd, FL_READING); - - /* Select the NAND device */ - chip->select_chip(mtd, chipnr); - } - - do { - 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; - else - bad &= 0xFF; - } else { - chip->cmdfunc(mtd, NAND_CMD_READOOB, chip->badblockpos, - page); - bad = chip->read_byte(mtd); - } - - if (likely(chip->badblockbits == 8)) - res = bad != 0xFF; - else - res = hweight8(bad) < chip->badblockbits; - ofs += mtd->writesize; - page = (int)(ofs >> chip->page_shift) & chip->pagemask; - i++; - } while (!res && i < 2 && (chip->bbt_options & NAND_BBT_SCAN2NDPAGE)); - - if (getchip) { - chip->select_chip(mtd, -1); - nand_release_device(mtd); - } - - return res; -} - -/** - * nand_default_block_markbad - [DEFAULT] mark a block bad via bad block marker - * @mtd: MTD device structure - * @ofs: offset from device start - * - * This is the default implementation, which can be overridden by a hardware - * specific driver. It provides the details for writing a bad block marker to a - * block. - */ -static __maybe_unused int nand_default_block_markbad(struct mtd_info *mtd, loff_t ofs) -{ - struct nand_chip *chip = mtd_to_nand(mtd); - struct mtd_oob_ops ops; - uint8_t buf[2] = { 0, 0 }; - int ret = 0, res, i = 0; - - ops.datbuf = NULL; - ops.oobbuf = buf; - ops.ooboffs = chip->badblockpos; - if (chip->options & NAND_BUSWIDTH_16) { - ops.ooboffs &= ~0x01; - ops.len = ops.ooblen = 2; - } else { - ops.len = ops.ooblen = 1; - } - ops.mode = MTD_OPS_PLACE_OOB; - - /* Write to first/last page(s) if necessary */ - if (chip->bbt_options & NAND_BBT_SCANLASTPAGE) - ofs += mtd->erasesize - mtd->writesize; - do { - res = nand_do_write_oob(mtd, ofs, &ops); - if (!ret) - ret = res; - - i++; - ofs += mtd->writesize; - } while ((chip->bbt_options & NAND_BBT_SCAN2NDPAGE) && i < 2); - - return ret; -} - -/** - * nand_block_markbad_lowlevel - mark a block bad - * @mtd: MTD device structure - * @ofs: offset from device start - * - * This function performs the generic NAND bad block marking steps (i.e., bad - * block table(s) and/or marker(s)). We only allow the hardware driver to - * specify how to write bad block markers to OOB (chip->block_markbad). - * - * We try operations in the following order: - * (1) erase the affected block, to allow OOB marker to be written cleanly - * (2) write bad block marker to OOB area of affected block (unless flag - * NAND_BBT_NO_OOB_BBM is present) - * (3) update the BBT - * Note that we retain the first error encountered in (2) or (3), finish the - * procedures, and dump the error in the end. - */ -static int nand_block_markbad_lowlevel(struct mtd_info *mtd, loff_t ofs) -{ - struct nand_chip *chip = mtd_to_nand(mtd); - int res, ret = 0; - - if (!(chip->bbt_options & NAND_BBT_NO_OOB_BBM)) { - struct erase_info einfo; - - /* Attempt erase before marking OOB */ - memset(&einfo, 0, sizeof(einfo)); - einfo.mtd = mtd; - einfo.addr = ofs; - einfo.len = 1 << chip->phys_erase_shift; - nand_erase_nand(mtd, &einfo, 0); - - /* Write bad block marker to OOB */ - nand_get_device(mtd, FL_WRITING); - ret = chip->block_markbad(mtd, ofs); - nand_release_device(mtd); - } - - /* Mark block bad in BBT */ - if (chip->bbt) { - res = nand_markbad_bbt(mtd, ofs); - if (!ret) - ret = res; - } - - if (!ret) - mtd->ecc_stats.badblocks++; - - return ret; -} - -/** - * nand_block_markgood_lowlevel - mark a block good - * @mtd: MTD device structure - * @ofs: offset from device start - * - * We try operations in the following order: - * (1) erase the affected block - * (2) check bad block marker - * (3) update the BBT - */ -static int nand_block_markgood_lowlevel(struct mtd_info *mtd, loff_t ofs) -{ - struct nand_chip *chip = mtd_to_nand(mtd); - bool allow_erasebad; - int ret; - - if (!(chip->bbt_options & NAND_BBT_NO_OOB_BBM)) { - struct erase_info einfo; - - /* Attempt erase possibly bad block */ - allow_erasebad = mtd->allow_erasebad; - mtd->allow_erasebad = true; - memset(&einfo, 0, sizeof(einfo)); - einfo.mtd = mtd; - einfo.addr = ofs; - einfo.len = 1 << chip->phys_erase_shift; - nand_erase_nand(mtd, &einfo, 0); - mtd->allow_erasebad = allow_erasebad; - - /* - * Verify erase succeded. We need to select chip again, - * as nand_erase_nand deselected it. - */ - ret = chip->block_bad(mtd, ofs, 1); - if (ret) - return ret; - } - - /* Mark block good in BBT */ - if (chip->bbt) { - ret = nand_markgood_bbt(mtd, ofs); - if (ret) - return ret; - } - - if (mtd->ecc_stats.badblocks > 0) - mtd->ecc_stats.badblocks--; - - return 0; -} - -/** - * nand_check_wp - [GENERIC] check if the chip is write protected - * @mtd: MTD device structure - * - * Check, if the device is write protected. The function expects, that the - * device is already selected. - */ -static int nand_check_wp(struct mtd_info *mtd) -{ - struct nand_chip *chip = mtd_to_nand(mtd); - - /* Broken xD cards report WP despite being writable */ - if (chip->options & NAND_BROKEN_XD) - return 0; - - /* Check the WP bit */ - chip->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1); - return (chip->read_byte(mtd) & NAND_STATUS_WP) ? 0 : 1; -} - -/** - * 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. - */ -static int nand_block_checkbad(struct mtd_info *mtd, loff_t ofs, int getchip, - int allowbbt) -{ - struct nand_chip *chip = mtd_to_nand(mtd); - - if (IS_ENABLED(CONFIG_NAND_BBT) && chip->bbt) { - /* Return info from the table */ - return nand_isbad_bbt(mtd, ofs, allowbbt); - } - - return chip->block_bad(mtd, ofs, getchip); -} - -/* Wait for the ready pin, after a command. The timeout is caught later. */ -void nand_wait_ready(struct mtd_info *mtd) -{ - struct nand_chip *chip = mtd_to_nand(mtd); - uint64_t start = get_time_ns(); - - /* wait until command is processed or timeout occures */ - do { - if (chip->dev_ready(mtd)) - break; - } while (!is_timeout(start, SECOND * 2)); -} - -/** - * 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 - * (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_to_nand(mtd); - int ctrl = NAND_CTRL_CLE | NAND_CTRL_CHANGE; - - /* Write out the command to the device */ - if (IS_ENABLED(CONFIG_MTD_WRITE) && 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 don't 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_to_nand(mtd); - - /* Emulate NAND_CMD_READOOB */ - if (command == NAND_CMD_READOOB) { - column += mtd->writesize; - command = NAND_CMD_READ0; - } - - /* Command latch cycle */ - chip->cmd_ctrl(mtd, command, 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: - 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_get_device - [GENERIC] Get chip for selected access - * @mtd: MTD device structure - * @new_state: the state which is requested - * - * Get the device and lock it for exclusive access - */ -static int -nand_get_device(struct mtd_info *mtd, int new_state) -{ - struct nand_chip *chip = mtd_to_nand(mtd); -retry: - - /* Hardware controller shared among independent devices */ - if (!chip->controller->active) - chip->controller->active = chip; - - if (chip->controller->active == chip && chip->state == FL_READY) { - chip->state = new_state; - return 0; - } - if (new_state == FL_PM_SUSPENDED) { - if (chip->controller->active->state == FL_PM_SUSPENDED) { - chip->state = FL_PM_SUSPENDED; - return 0; - } - } - goto retry; -} - -/** - * 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; - - /* Apply this short delay always to ensure that we do wait tWB in - * any case on any machine. */ - ndelay(100); - - 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; - } - } - - status = (int)chip->read_byte(mtd); - return status; -} - -/** - * __nand_unlock - [REPLACEABLE] unlocks specified locked blocks - * @mtd: mtd info - * @ofs: offset to start unlock from - * @len: length to unlock - * @invert: when = 0, unlock the range of blocks within the lower and - * upper boundary address - * when = 1, unlock the range of blocks outside the boundaries - * of the lower and upper boundary address - * - * Returs unlock status. - */ -static int __nand_unlock(struct mtd_info *mtd, loff_t ofs, - uint64_t len, int invert) -{ - int ret = 0; - int status, page; - struct nand_chip *chip = mtd_to_nand(mtd); - - /* Submit address of first page to unlock */ - page = ofs >> chip->page_shift; - chip->cmdfunc(mtd, NAND_CMD_UNLOCK1, -1, page & chip->pagemask); - - /* Submit address of last page to unlock */ - page = (ofs + len) >> chip->page_shift; - chip->cmdfunc(mtd, NAND_CMD_UNLOCK2, -1, - (page | invert) & chip->pagemask); - - /* Call wait ready function */ - status = chip->waitfunc(mtd, chip); - /* See if device thinks it succeeded */ - if (status & NAND_STATUS_FAIL) { - pr_debug("%s: error status = 0x%08x\n", - __func__, status); - ret = -EIO; - } - - return ret; -} - -/** - * nand_unlock - [REPLACEABLE] unlocks specified locked blocks - * @mtd: mtd info - * @ofs: offset to start unlock from - * @len: length to unlock - * - * Returns unlock status. - */ -int nand_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) -{ - int ret = 0; - int chipnr; - struct nand_chip *chip = mtd_to_nand(mtd); - - pr_debug("%s: start = 0x%012llx, len = %llu\n", - __func__, (unsigned long long)ofs, len); - - if (check_offs_len(mtd, ofs, len)) - ret = -EINVAL; - - /* Align to last block address if size addresses end of the device */ - if (ofs + len == mtd->size) - len -= mtd->erasesize; - - nand_get_device(mtd, FL_UNLOCKING); - - /* Shift to get chip number */ - chipnr = ofs >> chip->chip_shift; - - chip->select_chip(mtd, chipnr); - - /* - * Reset the chip. - * If we want to check the WP through READ STATUS and check the bit 7 - * we must reset the chip - * some operation can also clear the bit 7 of status register - * eg. erase/program a locked block - */ - chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1); - - /* Check, if it is write protected */ - if (nand_check_wp(mtd)) { - pr_debug("%s: device is write protected!\n", - __func__); - ret = -EIO; - goto out; - } - - ret = __nand_unlock(mtd, ofs, len, 0); - -out: - chip->select_chip(mtd, -1); - nand_release_device(mtd); - - return ret; -} -EXPORT_SYMBOL(nand_unlock); - -/** - * nand_lock - [REPLACEABLE] locks all blocks present in the device - * @mtd: mtd info - * @ofs: offset to start unlock from - * @len: length to unlock - * - * This feature is not supported in many NAND parts. 'Micron' NAND parts do - * have this feature, but it allows only to lock all blocks, not for specified - * range for block. Implementing 'lock' feature by making use of 'unlock', for - * now. - * - * Returns lock status. - */ -int nand_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) -{ - int ret = 0; - int chipnr, status, page; - struct nand_chip *chip = mtd_to_nand(mtd); - - pr_debug("%s: start = 0x%012llx, len = %llu\n", - __func__, (unsigned long long)ofs, len); - - if (check_offs_len(mtd, ofs, len)) - ret = -EINVAL; - - nand_get_device(mtd, FL_LOCKING); - - /* Shift to get chip number */ - chipnr = ofs >> chip->chip_shift; - - chip->select_chip(mtd, chipnr); - - /* - * Reset the chip. - * If we want to check the WP through READ STATUS and check the bit 7 - * we must reset the chip - * some operation can also clear the bit 7 of status register - * eg. erase/program a locked block - */ - chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1); - - /* Check, if it is write protected */ - if (nand_check_wp(mtd)) { - pr_debug("%s: device is write protected!\n", - __func__); - status = MTD_ERASE_FAILED; - ret = -EIO; - goto out; - } - - /* Submit address of first page to lock */ - page = ofs >> chip->page_shift; - chip->cmdfunc(mtd, NAND_CMD_LOCK, -1, page & chip->pagemask); - - /* Call wait ready function */ - status = chip->waitfunc(mtd, chip); - /* See if device thinks it succeeded */ - if (status & NAND_STATUS_FAIL) { - pr_debug("%s: error status = 0x%08x\n", - __func__, status); - ret = -EIO; - goto out; - } - - ret = __nand_unlock(mtd, ofs, len, 0x1); - -out: - chip->select_chip(mtd, -1); - nand_release_device(mtd); - - return ret; -} -EXPORT_SYMBOL(nand_lock); - -/** - * nand_check_erased_buf - check if a buffer contains (almost) only 0xff data - * @buf: buffer to test - * @len: buffer length - * @bitflips_threshold: maximum number of bitflips - * - * Check if a buffer contains only 0xff, which means the underlying region - * has been erased and is ready to be programmed. - * The bitflips_threshold specify the maximum number of bitflips before - * considering the region is not erased. - * Note: The logic of this function has been extracted from the memweight - * implementation, except that nand_check_erased_buf function exit before - * testing the whole buffer if the number of bitflips exceed the - * bitflips_threshold value. - * - * Returns a positive number of bitflips less than or equal to - * bitflips_threshold, or -ERROR_CODE for bitflips in excess of the - * threshold. - */ -int nand_check_erased_buf(void *buf, int len, int bitflips_threshold) -{ - const unsigned char *bitmap = buf; - int bitflips = 0; - int weight; - - for (; len && ((uintptr_t)bitmap) % sizeof(long); - len--, bitmap++) { - weight = hweight8(*bitmap); - bitflips += BITS_PER_BYTE - weight; - if (unlikely(bitflips > bitflips_threshold)) - return -EBADMSG; - } - - for (; len >= sizeof(long); - len -= sizeof(long), bitmap += sizeof(long)) { - weight = hweight_long(*((unsigned long *)bitmap)); - bitflips += BITS_PER_LONG - weight; - if (unlikely(bitflips > bitflips_threshold)) - return -EBADMSG; - } - - for (; len > 0; len--, bitmap++) { - weight = hweight8(*bitmap); - bitflips += BITS_PER_BYTE - weight; - if (unlikely(bitflips > bitflips_threshold)) - return -EBADMSG; - } - - return bitflips; -} - -/** - * nand_check_erased_ecc_chunk - check if an ECC chunk contains (almost) only - * 0xff data - * @data: data buffer to test - * @datalen: data length - * @ecc: ECC buffer - * @ecclen: ECC length - * @extraoob: extra OOB buffer - * @extraooblen: extra OOB length - * @bitflips_threshold: maximum number of bitflips - * - * Check if a data buffer and its associated ECC and OOB data contains only - * 0xff pattern, which means the underlying region has been erased and is - * ready to be programmed. - * The bitflips_threshold specify the maximum number of bitflips before - * considering the region as not erased. - * - * Note: - * 1/ ECC algorithms are working on pre-defined block sizes which are usually - * different from the NAND page size. When fixing bitflips, ECC engines will - * report the number of errors per chunk, and the NAND core infrastructure - * expect you to return the maximum number of bitflips for the whole page. - * This is why you should always use this function on a single chunk and - * not on the whole page. After checking each chunk you should update your - * max_bitflips value accordingly. - * 2/ When checking for bitflips in erased pages you should not only check - * the payload data but also their associated ECC data, because a user might - * have programmed almost all bits to 1 but a few. In this case, we - * shouldn't consider the chunk as erased, and checking ECC bytes prevent - * this case. - * 3/ The extraoob argument is optional, and should be used if some of your OOB - * data are protected by the ECC engine. - * It could also be used if you support subpages and want to attach some - * extra OOB data to an ECC chunk. - * - * Returns a positive number of bitflips less than or equal to - * bitflips_threshold, or -ERROR_CODE for bitflips in excess of the - * threshold. In case of success, the passed buffers are filled with 0xff. - */ -int nand_check_erased_ecc_chunk(void *data, int datalen, - void *ecc, int ecclen, - void *extraoob, int extraooblen, - int bitflips_threshold) -{ - int data_bitflips = 0, ecc_bitflips = 0, extraoob_bitflips = 0; - - data_bitflips = nand_check_erased_buf(data, datalen, - bitflips_threshold); - if (data_bitflips < 0) - return data_bitflips; - - bitflips_threshold -= data_bitflips; - - ecc_bitflips = nand_check_erased_buf(ecc, ecclen, bitflips_threshold); - if (ecc_bitflips < 0) - return ecc_bitflips; - - bitflips_threshold -= ecc_bitflips; - - extraoob_bitflips = nand_check_erased_buf(extraoob, extraooblen, - bitflips_threshold); - if (extraoob_bitflips < 0) - return extraoob_bitflips; - - if (data_bitflips) - memset(data, 0xff, datalen); - - if (ecc_bitflips) - memset(ecc, 0xff, ecclen); - - if (extraoob_bitflips) - memset(extraoob, 0xff, extraooblen); - - return data_bitflips + ecc_bitflips + extraoob_bitflips; -} -EXPORT_SYMBOL(nand_check_erased_ecc_chunk); - -/** - * 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 - * @oob_required: caller requires OOB data read to chip->oob_poi - * @page: page number to read - * - * Not for syndrome calculating ECC controllers, which use a special oob layout. - */ -static __maybe_unused int nand_read_page_raw(struct mtd_info *mtd, - struct nand_chip *chip, uint8_t *buf, int oob_required, int page) -{ - chip->read_buf(mtd, buf, mtd->writesize); - if (oob_required) - chip->read_buf(mtd, chip->oob_poi, mtd->oobsize); - return 0; -} - -/** - * nand_read_page_raw_syndrome - [INTERN] read raw page data without ecc - * @mtd: mtd info structure - * @chip: nand chip info structure - * @buf: buffer to store read data - * @oob_required: caller requires OOB data read to chip->oob_poi - * @page: page number to read - * - * We need a special oob layout and handling even when OOB isn't used. - */ -static __maybe_unused int nand_read_page_raw_syndrome(struct mtd_info *mtd, - struct nand_chip *chip, uint8_t *buf, - int oob_required, int page) -{ - int eccsize = chip->ecc.size; - int eccbytes = chip->ecc.bytes; - uint8_t *oob = chip->oob_poi; - int steps, size; - - for (steps = chip->ecc.steps; steps > 0; steps--) { - chip->read_buf(mtd, buf, eccsize); - buf += eccsize; - - if (chip->ecc.prepad) { - chip->read_buf(mtd, oob, chip->ecc.prepad); - oob += chip->ecc.prepad; - } - - chip->read_buf(mtd, oob, eccbytes); - oob += eccbytes; - - if (chip->ecc.postpad) { - chip->read_buf(mtd, oob, chip->ecc.postpad); - oob += chip->ecc.postpad; - } - } - - size = mtd->oobsize - (oob - chip->oob_poi); - if (size) - chip->read_buf(mtd, oob, size); - - return 0; -} - -/** - * nand_read_page_swecc - [REPLACEABLE] software ECC based page read function - * @mtd: mtd info structure - * @chip: nand chip info structure - * @buf: buffer to store read data - * @oob_required: caller requires OOB data read to chip->oob_poi - * @page: page number to read - */ -static __maybe_unused int nand_read_page_swecc(struct mtd_info *mtd, - struct nand_chip *chip, uint8_t *buf, int oob_required, - int page) -{ - int i, eccsize = chip->ecc.size; - int eccbytes = chip->ecc.bytes; - int eccsteps = chip->ecc.steps; - uint8_t *p = buf; - uint8_t *ecc_calc = chip->buffers->ecccalc; - uint8_t *ecc_code = chip->buffers->ecccode; - uint32_t *eccpos = chip->ecc.layout->eccpos; - unsigned int max_bitflips = 0; - - chip->ecc.read_page_raw(mtd, chip, buf, 1, page); - - for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) - chip->ecc.calculate(mtd, p, &ecc_calc[i]); - - for (i = 0; i < chip->ecc.total; i++) - ecc_code[i] = chip->oob_poi[eccpos[i]]; - - eccsteps = chip->ecc.steps; - p = buf; - - for (i = 0 ; eccsteps; eccsteps--, i += eccbytes, p += eccsize) { - int stat; - - stat = chip->ecc.correct(mtd, p, &ecc_code[i], &ecc_calc[i]); - if (stat < 0) { - mtd->ecc_stats.failed++; - } else { - mtd->ecc_stats.corrected += stat; - max_bitflips = max_t(unsigned int, max_bitflips, stat); - } - } - return max_bitflips; -} - -/** - * nand_read_subpage - [REPLACEABLE] 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 __maybe_unused int nand_read_subpage(struct mtd_info *mtd, - struct nand_chip *chip, uint32_t data_offs, uint32_t readlen, - uint8_t *bufpoi, int page) -{ - 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; - unsigned int max_bitflips = 0; - - /* - * Currently we have no users in barebox, so disable this for now - */ - return -ENOTSUPP; - - /* 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; - max_bitflips = max_t(unsigned int, max_bitflips, stat); - } - } - return max_bitflips; -} - -/** - * nand_read_page_hwecc - [REPLACEABLE] hardware ECC based page read function - * @mtd: mtd info structure - * @chip: nand chip info structure - * @buf: buffer to store read data - * @oob_required: caller requires OOB data read to chip->oob_poi - * @page: page number to read - * - * Not for syndrome calculating ECC controllers which need a special oob layout. - */ -static __maybe_unused int nand_read_page_hwecc(struct mtd_info *mtd, - struct nand_chip *chip, uint8_t *buf, int oob_required, int page) -{ - int i, eccsize = chip->ecc.size; - int eccbytes = chip->ecc.bytes; - int eccsteps = chip->ecc.steps; - uint8_t *p = buf; - uint8_t *ecc_calc = chip->buffers->ecccalc; - uint8_t *ecc_code = chip->buffers->ecccode; - uint32_t *eccpos = chip->ecc.layout->eccpos; - unsigned int max_bitflips = 0; - - for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) { - chip->ecc.hwctl(mtd, NAND_ECC_READ); - chip->read_buf(mtd, p, eccsize); - chip->ecc.calculate(mtd, p, &ecc_calc[i]); - } - chip->read_buf(mtd, chip->oob_poi, mtd->oobsize); - - for (i = 0; i < chip->ecc.total; i++) - ecc_code[i] = chip->oob_poi[eccpos[i]]; - - eccsteps = chip->ecc.steps; - p = buf; - - for (i = 0 ; eccsteps; eccsteps--, i += eccbytes, p += eccsize) { - int stat; - - stat = chip->ecc.correct(mtd, p, &ecc_code[i], &ecc_calc[i]); - if (stat < 0) { - mtd->ecc_stats.failed++; - } else { - mtd->ecc_stats.corrected += stat; - max_bitflips = max_t(unsigned int, max_bitflips, stat); - } - } - return max_bitflips; -} - -/** - * nand_read_page_hwecc_oob_first - [REPLACEABLE] hw ecc, read oob first - * @mtd: mtd info structure - * @chip: nand chip info structure - * @buf: buffer to store read data - * @oob_required: caller requires OOB data read to chip->oob_poi - * @page: page number to read - * - * Hardware ECC for large page chips, require OOB to be read first. For this - * ECC mode, the write_page method is re-used from ECC_HW. These methods - * read/write ECC from the OOB area, unlike the ECC_HW_SYNDROME support with - * multiple ECC steps, follows the "infix ECC" scheme and reads/writes ECC from - * the data area, by overwriting the NAND manufacturer bad block markings. - */ -static __maybe_unused int nand_read_page_hwecc_oob_first(struct mtd_info *mtd, - struct nand_chip *chip, uint8_t *buf, int oob_required, int page) -{ - int i, eccsize = chip->ecc.size; - int eccbytes = chip->ecc.bytes; - int eccsteps = chip->ecc.steps; - uint8_t *p = buf; - uint8_t *ecc_code = chip->buffers->ecccode; - uint32_t *eccpos = chip->ecc.layout->eccpos; - uint8_t *ecc_calc = chip->buffers->ecccalc; - unsigned int max_bitflips = 0; - - /* Read the OOB area first */ - chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page); - chip->read_buf(mtd, chip->oob_poi, mtd->oobsize); - chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page); - - for (i = 0; i < chip->ecc.total; i++) - ecc_code[i] = chip->oob_poi[eccpos[i]]; - - for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) { - int stat; - - chip->ecc.hwctl(mtd, NAND_ECC_READ); - chip->read_buf(mtd, p, eccsize); - chip->ecc.calculate(mtd, p, &ecc_calc[i]); - - stat = chip->ecc.correct(mtd, p, &ecc_code[i], NULL); - if (stat < 0) { - mtd->ecc_stats.failed++; - } else { - mtd->ecc_stats.corrected += stat; - max_bitflips = max_t(unsigned int, max_bitflips, stat); - } - } - return max_bitflips; -} - -/** - * nand_read_page_syndrome - [REPLACEABLE] hardware ECC syndrome based page read - * @mtd: mtd info structure - * @chip: nand chip info structure - * @buf: buffer to store read data - * @oob_required: caller requires OOB data read to chip->oob_poi - * @page: page number to read - * - * The hw generator calculates the error syndrome automatically. Therefore we - * need a special oob layout and handling. - */ -static __maybe_unused int nand_read_page_syndrome(struct mtd_info *mtd, struct nand_chip *chip, - uint8_t *buf, int oob_required, int page) -{ - int i, eccsize = chip->ecc.size; - int eccbytes = chip->ecc.bytes; - int eccsteps = chip->ecc.steps; - uint8_t *p = buf; - uint8_t *oob = chip->oob_poi; - unsigned int max_bitflips = 0; - - for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) { - int stat; - - chip->ecc.hwctl(mtd, NAND_ECC_READ); - chip->read_buf(mtd, p, eccsize); - - if (chip->ecc.prepad) { - chip->read_buf(mtd, oob, chip->ecc.prepad); - oob += chip->ecc.prepad; - } - - chip->ecc.hwctl(mtd, NAND_ECC_READSYN); - chip->read_buf(mtd, oob, eccbytes); - stat = chip->ecc.correct(mtd, p, oob, NULL); - - if (stat < 0) { - mtd->ecc_stats.failed++; - } else { - mtd->ecc_stats.corrected += stat; - max_bitflips = max_t(unsigned int, max_bitflips, stat); - } - - oob += eccbytes; - - if (chip->ecc.postpad) { - chip->read_buf(mtd, oob, chip->ecc.postpad); - oob += chip->ecc.postpad; - } - } - - /* Calculate remaining oob bytes */ - i = mtd->oobsize - (oob - chip->oob_poi); - if (i) - chip->read_buf(mtd, oob, i); - - return max_bitflips; -} - -/** - * nand_transfer_oob - [INTERN] Transfer oob to client buffer - * @chip: nand chip structure - * @oob: oob destination address - * @ops: oob ops structure - * @len: size of oob to transfer - */ -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_OPS_PLACE_OOB: - case MTD_OPS_RAW: - memcpy(oob, chip->oob_poi + ops->ooboffs, len); - return oob + len; - - case MTD_OPS_AUTO_OOB: { - 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; -} - -/** - * nand_do_read_ops - [INTERN] 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, oob_required; - struct nand_chip *chip = mtd_to_nand(mtd); - struct mtd_ecc_stats stats; - int ret = 0; - uint32_t readlen = ops->len; - uint32_t oobreadlen = ops->ooblen; - uint32_t max_oobsize = ops->mode == MTD_OPS_AUTO_OOB ? - mtd->oobavail : mtd->oobsize; - - uint8_t *bufpoi, *oob, *buf; - unsigned int max_bitflips = 0; - - 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; - oob_required = oob ? 1 : 0; - - 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; - - chip->cmdfunc(mtd, NAND_CMD_READ0, 0x00, page); - - /* - * Now read the page into the buffer. Absent an error, - * the read methods return max bitflips per ecc step. - */ - if (unlikely(ops->mode == MTD_OPS_RAW)) - ret = chip->ecc.read_page_raw(mtd, chip, bufpoi, - oob_required, - page); - else if (!aligned && NAND_HAS_SUBPAGE_READ(chip) && - !oob) - ret = chip->ecc.read_subpage(mtd, chip, - col, bytes, bufpoi, page); - else - ret = chip->ecc.read_page(mtd, chip, bufpoi, - oob_required, page); - if (ret < 0) { - if (!aligned) - /* Invalidate page cache */ - chip->pagebuf = -1; - break; - } - - max_bitflips = max_t(unsigned int, max_bitflips, ret); - - /* Transfer not aligned data */ - if (!aligned) { - if (!NAND_HAS_SUBPAGE_READ(chip) && !oob && - !(mtd->ecc_stats.failed - stats.failed) && - (ops->mode != MTD_OPS_RAW)) { - chip->pagebuf = realpage; - chip->pagebuf_bitflips = ret; - } else { - /* Invalidate page cache */ - chip->pagebuf = -1; - } - memcpy(buf, chip->buffers->databuf + col, bytes); - } - - buf += bytes; - - if (unlikely(oob)) { - int toread = min(oobreadlen, max_oobsize); - - if (toread) { - oob = nand_transfer_oob(chip, - oob, ops, toread); - oobreadlen -= toread; - } - } - - if (chip->options & NAND_NEED_READRDY) { - /* Apply delay or wait for ready/busy pin */ - if (!chip->dev_ready) - udelay(chip->chip_delay); - else - nand_wait_ready(mtd); - } - } else { - memcpy(buf, chip->buffers->databuf + col, bytes); - buf += bytes; - max_bitflips = max_t(unsigned int, max_bitflips, - chip->pagebuf_bitflips); - } - - 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); - } - } - chip->select_chip(mtd, -1); - - ops->retlen = ops->len - (size_t) readlen; - if (oob) - ops->oobretlen = ops->ooblen - oobreadlen; - - if (ret < 0) - return ret; - - if (mtd->ecc_stats.failed - stats.failed) - return -EBADMSG; - - return max_bitflips; -} - -/** - * nand_read - [MTD Interface] MTD compatibility 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 mtd_oob_ops ops; - int ret; - - nand_get_device(mtd, FL_READING); - ops.len = len; - ops.datbuf = buf; - ops.oobbuf = NULL; - ops.mode = MTD_OPS_PLACE_OOB; - ret = nand_do_read_ops(mtd, from, &ops); - *retlen = ops.retlen; - nand_release_device(mtd); - return ret; -} - -/** - * nand_read_oob_std - [REPLACEABLE] the most common OOB data read function - * @mtd: mtd info structure - * @chip: nand chip info structure - * @page: page number to read - */ -static __maybe_unused int nand_read_oob_std(struct mtd_info *mtd, - struct nand_chip *chip, int page) -{ - if (!IS_ENABLED(CONFIG_NAND_READ_OOB)) - return -ENOTSUPP; - - chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page); - chip->read_buf(mtd, chip->oob_poi, mtd->oobsize); - return 0; -} - -/** - * nand_read_oob_syndrome - [REPLACEABLE] OOB data read function for HW ECC - * with syndromes - * @mtd: mtd info structure - * @chip: nand chip info structure - * @page: page number to read - */ -static __maybe_unused int nand_read_oob_syndrome(struct mtd_info *mtd, - struct nand_chip *chip, int page) -{ - uint8_t *buf = chip->oob_poi; - int length = mtd->oobsize; - int chunk = chip->ecc.bytes + chip->ecc.prepad + chip->ecc.postpad; - int eccsize = chip->ecc.size; - uint8_t *bufpoi = buf; - int i, toread, sndrnd = 0, pos; - - if (!IS_ENABLED(CONFIG_NAND_READ_OOB)) - return -ENOTSUPP; - - chip->cmdfunc(mtd, NAND_CMD_READ0, chip->ecc.size, page); - for (i = 0; i < chip->ecc.steps; i++) { - if (sndrnd) { - pos = eccsize + i * (eccsize + chunk); - if (mtd->writesize > 512) - chip->cmdfunc(mtd, NAND_CMD_RNDOUT, pos, -1); - else - chip->cmdfunc(mtd, NAND_CMD_READ0, pos, page); - } else - sndrnd = 1; - toread = min_t(int, length, chunk); - chip->read_buf(mtd, bufpoi, toread); - bufpoi += toread; - length -= toread; - } - if (length > 0) - chip->read_buf(mtd, bufpoi, length); - - return 0; -} - -/** - * nand_write_oob_std - [REPLACEABLE] the most common OOB data write function - * @mtd: mtd info structure - * @chip: nand chip info structure - * @page: page number to write - */ -static __maybe_unused int nand_write_oob_std(struct mtd_info *mtd, - struct nand_chip *chip, int page) -{ - int status = 0; - const uint8_t *buf = chip->oob_poi; - int length = mtd->oobsize; - - if (!IS_ENABLED(CONFIG_NAND_READ_OOB) || !IS_ENABLED(CONFIG_MTD_WRITE)) - return -ENOTSUPP; - - chip->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize, page); - chip->write_buf(mtd, buf, length); - /* Send command to program the OOB data */ - chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1); - - status = chip->waitfunc(mtd, chip); - - return status & NAND_STATUS_FAIL ? -EIO : 0; -} - -/** - * nand_write_oob_syndrome - [REPLACEABLE] OOB data write function for HW ECC - * with syndrome - only for large page flash - * @mtd: mtd info structure - * @chip: nand chip info structure - * @page: page number to write - */ -static __maybe_unused int nand_write_oob_syndrome(struct mtd_info *mtd, - struct nand_chip *chip, int page) -{ - int chunk = chip->ecc.bytes + chip->ecc.prepad + chip->ecc.postpad; - int eccsize = chip->ecc.size, length = mtd->oobsize; - int i, len, pos, status = 0, sndcmd = 0, steps = chip->ecc.steps; - const uint8_t *bufpoi = chip->oob_poi; - - if (!IS_ENABLED(CONFIG_NAND_READ_OOB) || !IS_ENABLED(CONFIG_MTD_WRITE)) - return -ENOTSUPP; - - /* - * data-ecc-data-ecc ... ecc-oob - * or - * data-pad-ecc-pad-data-pad .... ecc-pad-oob - */ - if (!chip->ecc.prepad && !chip->ecc.postpad) { - pos = steps * (eccsize + chunk); - steps = 0; - } else - pos = eccsize; - - chip->cmdfunc(mtd, NAND_CMD_SEQIN, pos, page); - for (i = 0; i < steps; i++) { - if (sndcmd) { - if (mtd->writesize <= 512) { - uint32_t fill = 0xFFFFFFFF; - - len = eccsize; - while (len > 0) { - int num = min_t(int, len, 4); - chip->write_buf(mtd, (uint8_t *)&fill, - num); - len -= num; - } - } else { - pos = eccsize + i * (eccsize + chunk); - chip->cmdfunc(mtd, NAND_CMD_RNDIN, pos, -1); - } - } else - sndcmd = 1; - len = min_t(int, length, chunk); - chip->write_buf(mtd, bufpoi, len); - bufpoi += len; - length -= len; - } - if (length > 0) - chip->write_buf(mtd, bufpoi, length); - - chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1); - status = chip->waitfunc(mtd, chip); - - return status & NAND_STATUS_FAIL ? -EIO : 0; -} - -/** - * 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. - */ -static int nand_do_read_oob(struct mtd_info *mtd, loff_t from, - struct mtd_oob_ops *ops) -{ - int page, realpage, chipnr; - struct nand_chip *chip = mtd_to_nand(mtd); - struct mtd_ecc_stats stats; - int readlen = ops->ooblen; - int len; - uint8_t *buf = ops->oobbuf; - int ret = 0; - - if (!IS_ENABLED(CONFIG_NAND_READ_OOB)) - return -ENOTSUPP; - - pr_debug("%s: from = 0x%08Lx, len = %i\n", - __func__, (unsigned long long)from, readlen); - - stats = mtd->ecc_stats; - - if (ops->mode == MTD_OPS_AUTO_OOB) - len = chip->ecc.layout->oobavail; - else - len = mtd->oobsize; - - if (unlikely(ops->ooboffs >= len)) { - pr_debug("%s: attempt to start read outside oob\n", - __func__); - 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)) { - pr_debug("%s: attempt to read beyond end of device\n", - __func__); - 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) { - if (ops->mode == MTD_OPS_RAW) - ret = chip->ecc.read_oob_raw(mtd, chip, page); - else - ret = chip->ecc.read_oob(mtd, chip, page); - - if (ret < 0) - break; - - len = min(len, readlen); - buf = nand_transfer_oob(chip, buf, ops, len); - - if (chip->options & NAND_NEED_READRDY) { - /* Apply delay or wait for ready/busy pin */ - 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); - } - } - chip->select_chip(mtd, -1); - - ops->oobretlen = ops->ooblen - readlen; - - if (ret < 0) - return ret; - - if (mtd->ecc_stats.failed - stats.failed) - return -EBADMSG; - - return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 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 = -ENOTSUPP; - - if (!IS_ENABLED(CONFIG_NAND_READ_OOB)) - return -ENOTSUPP; - - ops->retlen = 0; - - /* Do not allow reads past end of device */ - if (ops->datbuf && (from + ops->len) > mtd->size) { - pr_debug("%s: attempt to read beyond end of device\n", - __func__); - return -EINVAL; - } - - nand_get_device(mtd, FL_READING); - - switch (ops->mode) { - case MTD_OPS_PLACE_OOB: - case MTD_OPS_AUTO_OOB: - case MTD_OPS_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: - nand_release_device(mtd); - return ret; -} - - -/** - * nand_write_page_raw - [INTERN] raw page write function - * @mtd: mtd info structure - * @chip: nand chip info structure - * @buf: data buffer - * @oob_required: must write chip->oob_poi to OOB - * - * Not for syndrome calculating ECC controllers, which use a special oob layout. - */ -static __maybe_unused int nand_write_page_raw(struct mtd_info *mtd, - struct nand_chip *chip, const uint8_t *buf, int oob_required) -{ - if (!IS_ENABLED(CONFIG_MTD_WRITE)) - return -ENOTSUPP; - - chip->write_buf(mtd, buf, mtd->writesize); - if (oob_required) - chip->write_buf(mtd, chip->oob_poi, mtd->oobsize); - - return 0; -} - -/** - * nand_write_page_raw_syndrome - [INTERN] raw page write function - * @mtd: mtd info structure - * @chip: nand chip info structure - * @buf: data buffer - * @oob_required: must write chip->oob_poi to OOB - * - * We need a special oob layout and handling even when ECC isn't checked. - */ -static __maybe_unused int nand_write_page_raw_syndrome(struct mtd_info *mtd, - struct nand_chip *chip, - const uint8_t *buf, int oob_required) -{ - int eccsize = chip->ecc.size; - int eccbytes = chip->ecc.bytes; - uint8_t *oob = chip->oob_poi; - int steps, size; - - if (!IS_ENABLED(CONFIG_MTD_WRITE)) - return -ENOTSUPP; - - for (steps = chip->ecc.steps; steps > 0; steps--) { - chip->write_buf(mtd, buf, eccsize); - buf += eccsize; - - if (chip->ecc.prepad) { - chip->write_buf(mtd, oob, chip->ecc.prepad); - oob += chip->ecc.prepad; - } - - chip->read_buf(mtd, oob, eccbytes); - oob += eccbytes; - - if (chip->ecc.postpad) { - chip->write_buf(mtd, oob, chip->ecc.postpad); - oob += chip->ecc.postpad; - } - } - - size = mtd->oobsize - (oob - chip->oob_poi); - if (size) - chip->write_buf(mtd, oob, size); - - return 0; -} -/** - * nand_write_page_swecc - [REPLACEABLE] software ECC based page write function - * @mtd: mtd info structure - * @chip: nand chip info structure - * @buf: data buffer - * @oob_required: must write chip->oob_poi to OOB - */ -static __maybe_unused int nand_write_page_swecc(struct mtd_info *mtd, - struct nand_chip *chip, const uint8_t *buf, int oob_required) -{ - int i, eccsize = chip->ecc.size; - int eccbytes = chip->ecc.bytes; - int eccsteps = chip->ecc.steps; - uint8_t *ecc_calc = chip->buffers->ecccalc; - const uint8_t *p = buf; - uint32_t *eccpos = chip->ecc.layout->eccpos; - - if (!IS_ENABLED(CONFIG_MTD_WRITE)) - return -ENOTSUPP; - - /* Software ECC calculation */ - for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) - chip->ecc.calculate(mtd, p, &ecc_calc[i]); - - for (i = 0; i < chip->ecc.total; i++) - chip->oob_poi[eccpos[i]] = ecc_calc[i]; - - return chip->ecc.write_page_raw(mtd, chip, buf, 1); -} - -/** - * nand_write_page_hwecc - [REPLACEABLE] hardware ECC based page write function - * @mtd: mtd info structure - * @chip: nand chip info structure - * @buf: data buffer - * @oob_required: must write chip->oob_poi to OOB - */ -static __maybe_unused int nand_write_page_hwecc(struct mtd_info *mtd, - struct nand_chip *chip, const uint8_t *buf, int oob_required) -{ - int i, eccsize = chip->ecc.size; - int eccbytes = chip->ecc.bytes; - int eccsteps = chip->ecc.steps; - uint8_t *ecc_calc = chip->buffers->ecccalc; - const uint8_t *p = buf; - uint32_t *eccpos = chip->ecc.layout->eccpos; - - if (!IS_ENABLED(CONFIG_MTD_WRITE)) - return -ENOTSUPP; - - for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) { - chip->ecc.hwctl(mtd, NAND_ECC_WRITE); - chip->write_buf(mtd, p, eccsize); - chip->ecc.calculate(mtd, p, &ecc_calc[i]); - } - - for (i = 0; i < chip->ecc.total; i++) - chip->oob_poi[eccpos[i]] = ecc_calc[i]; - - chip->write_buf(mtd, chip->oob_poi, mtd->oobsize); - - return 0; -} - - -/** - * nand_write_subpage_hwecc - [REPLACABLE] hardware ECC based subpage write - * @mtd: mtd info structure - * @chip: nand chip info structure - * @column: column address of subpage within the page - * @data_len: data length - * @oob_required: must write chip->oob_poi to OOB - */ -static __maybe_unused int nand_write_subpage_hwecc(struct mtd_info *mtd, - struct nand_chip *chip, uint32_t offset, - uint32_t data_len, const uint8_t *data_buf, - int oob_required) -{ - uint8_t *oob_buf = chip->oob_poi; - uint8_t *ecc_calc = chip->buffers->ecccalc; - int ecc_size = chip->ecc.size; - int ecc_bytes = chip->ecc.bytes; - int ecc_steps = chip->ecc.steps; - uint32_t *eccpos = chip->ecc.layout->eccpos; - uint32_t start_step = offset / ecc_size; - uint32_t end_step = (offset + data_len - 1) / ecc_size; - int oob_bytes = mtd->oobsize / ecc_steps; - int step, i; - - if (!IS_ENABLED(CONFIG_MTD_WRITE)) - return -ENOTSUPP; - - for (step = 0; step < ecc_steps; step++) { - /* configure controller for WRITE access */ - chip->ecc.hwctl(mtd, NAND_ECC_WRITE); - - /* write data (untouched subpages already masked by 0xFF) */ - chip->write_buf(mtd, data_buf, ecc_size); - - /* mask ECC of un-touched subpages by padding 0xFF */ - if ((step < start_step) || (step > end_step)) - memset(ecc_calc, 0xff, ecc_bytes); - else - chip->ecc.calculate(mtd, data_buf, ecc_calc); - - /* mask OOB of un-touched subpages by padding 0xFF */ - /* if oob_required, preserve OOB metadata of written subpage */ - if (!oob_required || (step < start_step) || (step > end_step)) - memset(oob_buf, 0xff, oob_bytes); - - data_buf += ecc_size; - ecc_calc += ecc_bytes; - oob_buf += oob_bytes; - } - - /* copy calculated ECC for whole page to chip->buffer->oob */ - /* this include masked-value(0xFF) for unwritten subpages */ - ecc_calc = chip->buffers->ecccalc; - for (i = 0; i < chip->ecc.total; i++) - chip->oob_poi[eccpos[i]] = ecc_calc[i]; - - /* write OOB buffer to NAND device */ - chip->write_buf(mtd, chip->oob_poi, mtd->oobsize); - - return 0; -} - - -/** - * nand_write_page_syndrome - [REPLACEABLE] hardware ECC syndrome based page write - * @mtd: mtd info structure - * @chip: nand chip info structure - * @buf: data buffer - * @oob_required: must write chip->oob_poi to OOB - * - * The hw generator calculates the error syndrome automatically. Therefore we - * need a special oob layout and handling. - */ -static __maybe_unused int nand_write_page_syndrome(struct mtd_info *mtd, - struct nand_chip *chip, - const uint8_t *buf, int oob_required) -{ - int i, eccsize = chip->ecc.size; - int eccbytes = chip->ecc.bytes; - int eccsteps = chip->ecc.steps; - const uint8_t *p = buf; - uint8_t *oob = chip->oob_poi; - - if (!IS_ENABLED(CONFIG_MTD_WRITE)) - return -ENOTSUPP; - - for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) { - - chip->ecc.hwctl(mtd, NAND_ECC_WRITE); - chip->write_buf(mtd, p, eccsize); - - if (chip->ecc.prepad) { - chip->write_buf(mtd, oob, chip->ecc.prepad); - oob += chip->ecc.prepad; - } - - chip->ecc.calculate(mtd, p, oob); - chip->write_buf(mtd, oob, eccbytes); - oob += eccbytes; - - if (chip->ecc.postpad) { - chip->write_buf(mtd, oob, chip->ecc.postpad); - oob += chip->ecc.postpad; - } - } - - /* Calculate remaining oob bytes */ - i = mtd->oobsize - (oob - chip->oob_poi); - if (i) - chip->write_buf(mtd, oob, i); - - return 0; -} - -/** - * nand_write_page - [REPLACEABLE] write one page - * @mtd: MTD device structure - * @chip: NAND chip descriptor - * @offset: address offset within the page - * @data_len: length of actual data to be written - * @buf: the data to write - * @oob_required: must write chip->oob_poi to OOB - * @page: page number to write - * @cached: cached programming - * @raw: use _raw version of write_page - */ -static int nand_write_page(struct mtd_info *mtd, struct nand_chip *chip, - uint32_t offset, int data_len, const uint8_t *buf, - int oob_required, int page, int cached, int raw) -{ - int status, subpage; - - if (!IS_ENABLED(CONFIG_MTD_WRITE)) - return -ENOTSUPP; - - if (!(chip->options & NAND_NO_SUBPAGE_WRITE) && - chip->ecc.write_subpage) - subpage = offset || (data_len < mtd->writesize); - else - subpage = 0; - - chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page); - - if (unlikely(raw)) - status = chip->ecc.write_page_raw(mtd, chip, buf, - oob_required); - else if (subpage) - status = chip->ecc.write_subpage(mtd, chip, offset, data_len, - buf, oob_required); - else - status = chip->ecc.write_page(mtd, chip, buf, oob_required); - - if (status < 0) - return status; - - /* - * Cached progamming disabled for now. Not sure if it's worth the - * trouble. The speed gain is not very impressive. (2.3->2.6Mib/s). - */ - cached = 0; - - if (!cached || !NAND_HAS_CACHEPROG(chip)) { - - chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1); - status = chip->waitfunc(mtd, chip); - /* - * See if operation failed and additional status checks are - * available. - */ - if ((status & NAND_STATUS_FAIL) && (chip->errstat)) - status = chip->errstat(mtd, chip, FL_WRITING, status, - page); - - if (status & NAND_STATUS_FAIL) - return -EIO; - } else { - chip->cmdfunc(mtd, NAND_CMD_CACHEDPROG, -1, -1); - status = chip->waitfunc(mtd, chip); - } - - return 0; -} - -/** - * nand_fill_oob - [INTERN] Transfer client buffer to oob - * @mtd: MTD device structure - * @oob: oob data buffer - * @len: oob data write length - * @ops: oob ops structure - */ -static uint8_t *nand_fill_oob(struct mtd_info *mtd, uint8_t *oob, size_t len, - struct mtd_oob_ops *ops) -{ - struct nand_chip *chip = mtd_to_nand(mtd); - - /* - * Initialise to all 0xFF, to avoid the possibility of left over OOB - * data from a previous OOB read. - */ - memset(chip->oob_poi, 0xff, mtd->oobsize); - - switch (ops->mode) { - - case MTD_OPS_PLACE_OOB: - case MTD_OPS_RAW: - memcpy(chip->oob_poi + ops->ooboffs, oob, len); - return oob + len; - - case MTD_OPS_AUTO_OOB: { - struct nand_oobfree *free = chip->ecc.layout->oobfree; - uint32_t boffs = 0, woffs = ops->ooboffs; - size_t bytes = 0; - - for (; free->length && len; free++, len -= bytes) { - /* Write request not from offset 0? */ - if (unlikely(woffs)) { - if (woffs >= free->length) { - woffs -= free->length; - continue; - } - boffs = free->offset + woffs; - bytes = min_t(size_t, len, - (free->length - woffs)); - woffs = 0; - } else { - bytes = min_t(size_t, len, free->length); - boffs = free->offset; - } - memcpy(chip->oob_poi + boffs, oob, bytes); - oob += bytes; - } - return oob; - } - default: - BUG(); - } - return NULL; -} - -#define NOTALIGNED(x) ((x & (chip->subpagesize - 1)) != 0) - -/** - * nand_do_write_ops - [INTERN] NAND write with ECC - * @mtd: MTD device structure - * @to: offset to write to - * @ops: oob operations description structure - * - * NAND write with ECC. - */ -static int nand_do_write_ops(struct mtd_info *mtd, loff_t to, - struct mtd_oob_ops *ops) -{ - int chipnr, realpage, page, blockmask, column; - struct nand_chip *chip = mtd_to_nand(mtd); - uint32_t writelen = ops->len; - - uint32_t oobwritelen = ops->ooblen; - uint32_t oobmaxlen = ops->mode == MTD_OPS_AUTO_OOB ? - mtd->oobavail : mtd->oobsize; - - uint8_t *oob = ops->oobbuf; - uint8_t *buf = ops->datbuf; - int ret; - int oob_required = oob ? 1 : 0; - - if (!IS_ENABLED(CONFIG_MTD_WRITE)) - return -ENOTSUPP; - - ops->retlen = 0; - if (!writelen) - return 0; - - column = to & (mtd->writesize - 1); - - chipnr = (int)(to >> chip->chip_shift); - chip->select_chip(mtd, chipnr); - - /* Check, if it is write protected */ - if (nand_check_wp(mtd)) { - ret = -EIO; - goto err_out; - } - - realpage = (int)(to >> chip->page_shift); - page = realpage & chip->pagemask; - blockmask = (1 << (chip->phys_erase_shift - chip->page_shift)) - 1; - - /* Invalidate the page cache, when we write to the cached page */ - if (to <= (chip->pagebuf << chip->page_shift) && - (chip->pagebuf << chip->page_shift) < (to + ops->len)) - chip->pagebuf = -1; - - /* Don't allow multipage oob writes with offset */ - if (oob && ops->ooboffs && (ops->ooboffs + ops->ooblen > oobmaxlen)) { - ret = -EINVAL; - goto err_out; - } - - while (1) { - int bytes = mtd->writesize; - int cached = writelen > bytes && page != blockmask; - uint8_t *wbuf = buf; - - /* Partial page write? */ - if (unlikely(column || writelen < (mtd->writesize - 1))) { - cached = 0; - bytes = min_t(int, bytes - column, (int) writelen); - chip->pagebuf = -1; - memset(chip->buffers->databuf, 0xff, mtd->writesize); - memcpy(&chip->buffers->databuf[column], buf, bytes); - wbuf = chip->buffers->databuf; - } - - if (unlikely(oob)) { - size_t len = min(oobwritelen, oobmaxlen); - oob = nand_fill_oob(mtd, oob, len, ops); - oobwritelen -= len; - } else { - /* We still need to erase leftover OOB data */ - memset(chip->oob_poi, 0xff, mtd->oobsize); - } - - if (oob || !mtd_buf_all_ff(wbuf, mtd->writesize)) { - ret = chip->write_page(mtd, chip, column, bytes, wbuf, - oob_required, page, cached, - (ops->mode == MTD_OPS_RAW)); - if (ret) - break; - } - - writelen -= bytes; - if (!writelen) - break; - - column = 0; - buf += bytes; - 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); - } - } - - ops->retlen = ops->len - writelen; - if (unlikely(oob)) - ops->oobretlen = ops->ooblen; - -err_out: - chip->select_chip(mtd, -1); - return ret; -} - -/** - * nand_write - [MTD Interface] NAND write with ECC - * @mtd: MTD device structure - * @to: offset to write to - * @len: number of bytes to write - * @retlen: pointer to variable to store the number of written bytes - * @buf: the data to write - * - * NAND write with ECC. - */ -static int nand_write(struct mtd_info *mtd, loff_t to, size_t len, - size_t *retlen, const uint8_t *buf) -{ - struct mtd_oob_ops ops; - int ret; - - if (!IS_ENABLED(CONFIG_MTD_WRITE)) - return -ENOTSUPP; - - nand_get_device(mtd, FL_WRITING); - ops.len = len; - ops.datbuf = (uint8_t *)buf; - ops.oobbuf = NULL; - ops.mode = MTD_OPS_PLACE_OOB; - ret = nand_do_write_ops(mtd, to, &ops); - *retlen = ops.retlen; - nand_release_device(mtd); - return ret; -} - -/** - * nand_do_write_oob - [MTD Interface] NAND write out-of-band - * @mtd: MTD device structure - * @to: offset to write to - * @ops: oob operation description structure - * - * NAND write out-of-band. - */ -static int nand_do_write_oob(struct mtd_info *mtd, loff_t to, - struct mtd_oob_ops *ops) -{ - int chipnr, page, status, len; - struct nand_chip *chip = mtd_to_nand(mtd); - - if (!IS_ENABLED(CONFIG_MTD_WRITE)) - return -ENOTSUPP; - - pr_debug("%s: to = 0x%08x, len = %i\n", - __func__, (unsigned int)to, (int)ops->ooblen); - - if (ops->mode == MTD_OPS_AUTO_OOB) - len = chip->ecc.layout->oobavail; - else - len = mtd->oobsize; - - /* Do not allow write past end of page */ - if ((ops->ooboffs + ops->ooblen) > len) { - pr_debug("%s: attempt to write past end of page\n", - __func__); - return -EINVAL; - } - - if (unlikely(ops->ooboffs >= len)) { - pr_debug("%s: attempt to start write outside oob\n", - __func__); - return -EINVAL; - } - - /* Do not allow write past end of device */ - if (unlikely(to >= mtd->size || - ops->ooboffs + ops->ooblen > - ((mtd->size >> chip->page_shift) - - (to >> chip->page_shift)) * len)) { - pr_debug("%s: attempt to write beyond end of device\n", - __func__); - return -EINVAL; - } - - chipnr = (int)(to >> chip->chip_shift); - chip->select_chip(mtd, chipnr); - - /* Shift to get page */ - page = (int)(to >> chip->page_shift); - - /* - * Reset the chip. Some chips (like the Toshiba TC5832DC found in one - * of my DiskOnChip 2000 test units) will clear the whole data page too - * if we don't do this. I have no clue why, but I seem to have 'fixed' - * it in the doc2000 driver in August 1999. dwmw2. - */ - chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1); - - /* Check, if it is write protected */ - if (nand_check_wp(mtd)) { - chip->select_chip(mtd, -1); - return -EROFS; - } - - /* Invalidate the page cache, if we write to the cached page */ - if (page == chip->pagebuf) - chip->pagebuf = -1; - - nand_fill_oob(mtd, ops->oobbuf, ops->ooblen, ops); - - if (ops->mode == MTD_OPS_RAW) - status = chip->ecc.write_oob_raw(mtd, chip, page & chip->pagemask); - else - status = chip->ecc.write_oob(mtd, chip, page & chip->pagemask); - - chip->select_chip(mtd, -1); - - if (status) - return status; - - ops->oobretlen = ops->ooblen; - - return 0; -} - -/** - * nand_write_oob - [MTD Interface] NAND write data and/or out-of-band - * @mtd: MTD device structure - * @to: offset to write to - * @ops: oob operation description structure - */ -static int nand_write_oob(struct mtd_info *mtd, loff_t to, - struct mtd_oob_ops *ops) -{ - int ret = -ENOTSUPP; - - if (!IS_ENABLED(CONFIG_MTD_WRITE)) - return -ENOTSUPP; - - ops->retlen = 0; - - /* Do not allow writes past end of device */ - if (ops->datbuf && (to + ops->len) > mtd->size) { - pr_debug("%s: attempt to write beyond end of device\n", - __func__); - return -EINVAL; - } - - nand_get_device(mtd, FL_WRITING); - - switch (ops->mode) { - case MTD_OPS_PLACE_OOB: - case MTD_OPS_AUTO_OOB: - case MTD_OPS_RAW: - break; - - default: - goto out; - } - - if (!ops->datbuf) - ret = nand_do_write_oob(mtd, to, ops); - else - ret = nand_do_write_ops(mtd, to, ops); - -out: - nand_release_device(mtd); - return ret; -} - -/** - * single_erase_cmd - [GENERIC] NAND standard block erase command function - * @mtd: MTD device structure - * @page: the page address of the block which will be erased - * - * Standard erase command for NAND chips. - */ -static void single_erase_cmd(struct mtd_info *mtd, int page) -{ - struct nand_chip *chip = mtd_to_nand(mtd); - - if (!IS_ENABLED(CONFIG_MTD_WRITE)) - return; - - /* Send commands to erase a block */ - chip->cmdfunc(mtd, NAND_CMD_ERASE1, -1, page); - chip->cmdfunc(mtd, NAND_CMD_ERASE2, -1, -1); -} - -/** - * nand_erase - [MTD Interface] erase block(s) - * @mtd: MTD device structure - * @instr: erase instruction - * - * Erase one ore more blocks. - */ -static int nand_erase(struct mtd_info *mtd, struct erase_info *instr) -{ - if (!IS_ENABLED(CONFIG_MTD_WRITE)) - return -ENOTSUPP; - - return nand_erase_nand(mtd, instr, 0); -} - -/** - * nand_erase_nand - [INTERN] erase block(s) - * @mtd: MTD device structure - * @instr: erase instruction - * @allowbbt: allow erasing the bbt area - * - * Erase one ore more blocks. - */ -int nand_erase_nand(struct mtd_info *mtd, struct erase_info *instr, - int allowbbt) -{ - int page, status, pages_per_block, ret, chipnr; - struct nand_chip *chip = mtd_to_nand(mtd); - loff_t len; - - if (!IS_ENABLED(CONFIG_MTD_WRITE)) - return -ENOTSUPP; - - pr_debug("%s: start = 0x%012llx, len = %llu\n", - __func__, (unsigned long long)instr->addr, - (unsigned long long)instr->len); - - if (check_offs_len(mtd, instr->addr, instr->len)) - return -EINVAL; - - /* Grab the lock and see if the device is available */ - nand_get_device(mtd, FL_ERASING); - - /* Shift to get first page */ - page = (int)(instr->addr >> chip->page_shift); - chipnr = (int)(instr->addr >> chip->chip_shift); - - /* Calculate pages in each block */ - pages_per_block = 1 << (chip->phys_erase_shift - chip->page_shift); - - /* Select the NAND device */ - chip->select_chip(mtd, chipnr); - - /* Check, if it is write protected */ - if (nand_check_wp(mtd)) { - pr_debug("%s: device is write protected!\n", - __func__); - instr->state = MTD_ERASE_FAILED; - goto erase_exit; - } - - /* Loop through the pages */ - len = instr->len; - - instr->state = MTD_ERASING; - - while (len) { - /* Check if we have a bad block, we do not erase bad blocks! */ - if (!mtd->allow_erasebad && - nand_block_checkbad(mtd, ((loff_t) page) << - chip->page_shift, 0, allowbbt)) { - pr_warn("%s: attempt to erase a bad block at page 0x%08x\n", - __func__, page); - instr->state = MTD_ERASE_FAILED; - goto erase_exit; - } - - /* - * Invalidate the page cache, if we erase the block which - * contains the current cached page. - */ - if (page <= chip->pagebuf && chip->pagebuf < - (page + pages_per_block)) - chip->pagebuf = -1; - - chip->erase_cmd(mtd, page & chip->pagemask); - - status = chip->waitfunc(mtd, chip); - - /* - * See if operation failed and additional status checks are - * available - */ - if ((status & NAND_STATUS_FAIL) && (chip->errstat)) - status = chip->errstat(mtd, chip, FL_ERASING, - status, page); - - /* See if block erase succeeded */ - if (status & NAND_STATUS_FAIL) { - pr_debug("%s: failed erase, page 0x%08x\n", - __func__, page); - instr->state = MTD_ERASE_FAILED; - instr->fail_addr = - ((loff_t)page << chip->page_shift); - goto erase_exit; - } - - /* Increment page address and decrement length */ - len -= (1 << chip->phys_erase_shift); - page += pages_per_block; - - /* Check, if we cross a chip boundary */ - if (len && !(page & chip->pagemask)) { - chipnr++; - chip->select_chip(mtd, -1); - chip->select_chip(mtd, chipnr); - } - } - instr->state = MTD_ERASE_DONE; - -erase_exit: - - ret = instr->state == MTD_ERASE_DONE ? 0 : -EIO; - - /* Deselect and wake up anyone waiting on the device */ - chip->select_chip(mtd, -1); - nand_release_device(mtd); - - /* Do call back function */ - if (!ret) - mtd_erase_callback(instr); - - /* Return more or less happy */ - return ret; -} - -/** - * nand_sync - [MTD Interface] sync - * @mtd: MTD device structure - * - * Sync is actually a wait for chip ready function. - */ -static void nand_sync(struct mtd_info *mtd) -{ - pr_debug("%s: called\n", __func__); - - /* Grab the lock and see if the device is available */ - nand_get_device(mtd, FL_SYNCING); - /* Release it and go back */ - nand_release_device(mtd); -} - -/** - * nand_block_isbad - [MTD Interface] Check if block at offset is bad - * @mtd: MTD device structure - * @offs: offset relative to mtd start - */ -static int nand_block_isbad(struct mtd_info *mtd, loff_t offs) -{ - return nand_block_checkbad(mtd, offs, 1, 0); -} - -/** - * nand_block_markbad - [MTD Interface] Mark block at the given offset as bad - * @mtd: MTD device structure - * @ofs: offset relative to mtd start - */ -static int nand_block_markbad(struct mtd_info *mtd, loff_t ofs) -{ - int ret; - - if (!IS_ENABLED(CONFIG_MTD_WRITE)) - return -ENOTSUPP; - - ret = nand_block_isbad(mtd, ofs); - if (ret) { - /* If it was bad already, return success and do nothing */ - if (ret > 0) - return 0; - return ret; - } - - return nand_block_markbad_lowlevel(mtd, ofs); -} - -/** - * nand_block_markgood - [MTD Interface] Mark block at the given offset as good - * @mtd: MTD device structure - * @ofs: offset relative to mtd start - */ -static int nand_block_markgood(struct mtd_info *mtd, loff_t ofs) -{ - int ret; - - if (!IS_ENABLED(CONFIG_MTD_WRITE)) - return -ENOTSUPP; - - ret = nand_block_isbad(mtd, ofs); - if (ret < 0) - return ret; - - /* If it was good already, return success and do nothing */ - if (!ret) - return 0; - - return nand_block_markgood_lowlevel(mtd, ofs); -} - -/** - * nand_onfi_set_features- [REPLACEABLE] set features for ONFI nand - * @mtd: MTD device structure - * @chip: nand chip info structure - * @addr: feature address. - * @subfeature_param: the subfeature parameters, a four bytes array. - */ -static int nand_onfi_set_features(struct mtd_info *mtd, struct nand_chip *chip, - int addr, uint8_t *subfeature_param) -{ - int status; - - if (!chip->onfi_version || - !(le16_to_cpu(chip->onfi_params.opt_cmd) - & ONFI_OPT_CMD_SET_GET_FEATURES)) - return -EINVAL; - - chip->cmdfunc(mtd, NAND_CMD_SET_FEATURES, addr, -1); - chip->write_buf(mtd, subfeature_param, ONFI_SUBFEATURE_PARAM_LEN); - status = chip->waitfunc(mtd, chip); - if (status & NAND_STATUS_FAIL) - return -EIO; - return 0; -} - -/** - * nand_onfi_get_features- [REPLACEABLE] get features for ONFI nand - * @mtd: MTD device structure - * @chip: nand chip info structure - * @addr: feature address. - * @subfeature_param: the subfeature parameters, a four bytes array. - */ -static int nand_onfi_get_features(struct mtd_info *mtd, struct nand_chip *chip, - int addr, uint8_t *subfeature_param) -{ - if (!chip->onfi_version || - !(le16_to_cpu(chip->onfi_params.opt_cmd) - & ONFI_OPT_CMD_SET_GET_FEATURES)) - return -EINVAL; - - /* clear the sub feature parameters */ - memset(subfeature_param, 0, ONFI_SUBFEATURE_PARAM_LEN); - - chip->cmdfunc(mtd, NAND_CMD_GET_FEATURES, addr, -1); - chip->read_buf(mtd, subfeature_param, ONFI_SUBFEATURE_PARAM_LEN); - 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; - - /* set for ONFI nand */ - if (!chip->onfi_set_features) - chip->onfi_set_features = nand_onfi_set_features; - if (!chip->onfi_get_features) - chip->onfi_get_features = nand_onfi_get_features; - - 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_MTD_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; -#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(uint8_t *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, j; - int val; - - /* Try ONFI for unknown 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; - - chip->cmdfunc(mtd, NAND_CMD_PARAM, 0, -1); - for (i = 0; i < 3; i++) { - for (j = 0; j < sizeof(*p); j++) - ((uint8_t *)p)[j] = chip->read_byte(mtd); - if (onfi_crc16(ONFI_CRC_BASE, (uint8_t *)p, 254) == - le16_to_cpu(p->crc)) { - break; - } - } - - if (i == 3) { - pr_err("Could not find valid ONFI parameter page; aborting\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; - - if (!chip->onfi_version) { - pr_info("%s: unsupported ONFI version: %d\n", __func__, 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 = le32_to_cpu(p->blocks_per_lun); - chip->chipsize *= (uint64_t)mtd->erasesize * p->lun_count; - chip->bits_per_cell = p->bits_per_cell; - - *busw = 0; - if (le16_to_cpu(p->features) & 1) - *busw = NAND_BUSWIDTH_16; - - pr_info("ONFI flash detected\n"); - return 1; -} - -/* - * nand_id_has_period - Check if an ID string has a given wraparound period - * @id_data: the ID string - * @arrlen: the length of the @id_data array - * @period: the period of repitition - * - * Check if an ID string is repeated within a given sequence of bytes at - * specific repetition interval period (e.g., {0x20,0x01,0x7F,0x20} has a - * period of 3). This is a helper function for nand_id_len(). Returns non-zero - * if the repetition has a period of @period; otherwise, returns zero. - */ -static int nand_id_has_period(u8 *id_data, int arrlen, int period) -{ - int i, j; - for (i = 0; i < period; i++) - for (j = i + period; j < arrlen; j += period) - if (id_data[i] != id_data[j]) - return 0; - return 1; -} - -/* - * nand_id_len - Get the length of an ID string returned by CMD_READID - * @id_data: the ID string - * @arrlen: the length of the @id_data array - - * Returns the length of the ID string, according to known wraparound/trailing - * zero patterns. If no pattern exists, returns the length of the array. - */ -static int nand_id_len(u8 *id_data, int arrlen) -{ - int last_nonzero, period; - - /* Find last non-zero byte */ - for (last_nonzero = arrlen - 1; last_nonzero >= 0; last_nonzero--) - if (id_data[last_nonzero]) - break; - - /* All zeros */ - if (last_nonzero < 0) - return 0; - - /* Calculate wraparound period */ - for (period = 1; period < arrlen; period++) - if (nand_id_has_period(id_data, arrlen, period)) - break; - - /* There's a repeated pattern */ - if (period < arrlen) - return period; - - /* There are trailing zeros */ - if (last_nonzero < arrlen - 1) - return last_nonzero + 1; - - /* No pattern detected */ - return arrlen; -} - -/* Extract the bits of per cell from the 3rd byte of the extended ID */ -static int nand_get_bits_per_cell(u8 cellinfo) -{ - int bits; - - bits = cellinfo & NAND_CI_CELLTYPE_MSK; - bits >>= NAND_CI_CELLTYPE_SHIFT; - return bits + 1; -} - -/* - * Many new NAND share similar device ID codes, which represent the size of the - * chip. The rest of the parameters must be decoded according to generic or - * manufacturer-specific "extended ID" decoding patterns. - */ -static void nand_decode_ext_id(struct mtd_info *mtd, struct nand_chip *chip, - u8 id_data[8], int *busw) -{ - int extid, id_len; - /* The 3rd id byte holds MLC / multichip data */ - chip->bits_per_cell = nand_get_bits_per_cell(id_data[2]); - /* The 4th id byte is the important one */ - extid = id_data[3]; - - id_len = nand_id_len(id_data, 8); - - /* - * Field definitions are in the following datasheets: - * Old style (4,5 byte ID): Samsung K9GAG08U0M (p.32) - * New Samsung (6 byte ID): Samsung K9GAG08U0F (p.44) - * Hynix MLC (6 byte ID): Hynix H27UBG8T2B (p.22) - * - * Check for ID length, non-zero 6th byte, cell type, and Hynix/Samsung - * ID to decide what to do. - */ - if (id_len == 6 && id_data[0] == NAND_MFR_SAMSUNG && - !nand_is_slc(chip) && id_data[5] != 0x00) { - /* Calc pagesize */ - mtd->writesize = 2048 << (extid & 0x03); - extid >>= 2; - /* Calc oobsize */ - switch (((extid >> 2) & 0x04) | (extid & 0x03)) { - case 1: - mtd->oobsize = 128; - break; - case 2: - mtd->oobsize = 218; - break; - case 3: - mtd->oobsize = 400; - break; - case 4: - mtd->oobsize = 436; - break; - case 5: - mtd->oobsize = 512; - break; - case 6: - default: /* Other cases are "reserved" (unknown) */ - mtd->oobsize = 640; - break; - } - extid >>= 2; - /* Calc blocksize */ - mtd->erasesize = (128 * 1024) << - (((extid >> 1) & 0x04) | (extid & 0x03)); - *busw = 0; - } else if (id_len == 6 && id_data[0] == NAND_MFR_HYNIX && - !nand_is_slc(chip)) { - unsigned int tmp; - - /* Calc pagesize */ - mtd->writesize = 2048 << (extid & 0x03); - extid >>= 2; - /* Calc oobsize */ - switch (((extid >> 2) & 0x04) | (extid & 0x03)) { - case 0: - mtd->oobsize = 128; - break; - case 1: - mtd->oobsize = 224; - break; - case 2: - mtd->oobsize = 448; - break; - case 3: - mtd->oobsize = 64; - break; - case 4: - mtd->oobsize = 32; - break; - case 5: - mtd->oobsize = 16; - break; - default: - mtd->oobsize = 640; - break; - } - extid >>= 2; - /* Calc blocksize */ - tmp = ((extid >> 1) & 0x04) | (extid & 0x03); - if (tmp < 0x03) - mtd->erasesize = (128 * 1024) << tmp; - else if (tmp == 0x03) - mtd->erasesize = 768 * 1024; - else - mtd->erasesize = (64 * 1024) << tmp; - *busw = 0; - } else { - /* Calc pagesize */ - mtd->writesize = 1024 << (extid & 0x03); - 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; - /* - * Toshiba 24nm raw SLC (i.e., not BENAND) have 32B OOB per - * 512B page. For Toshiba SLC, we decode the 5th/6th byte as - * follows: - * - ID byte 6, bits[2:0]: 100b -> 43nm, 101b -> 32nm, - * 110b -> 24nm - * - ID byte 5, bit[7]: 1 -> BENAND, 0 -> raw SLC - */ - if (id_len >= 6 && id_data[0] == NAND_MFR_TOSHIBA && - nand_is_slc(chip) && - (id_data[5] & 0x7) == 0x6 /* 24nm */ && - !(id_data[4] & 0x80) /* !BENAND */) { - mtd->oobsize = 32 * mtd->writesize >> 9; - } - } -} - -/* - * Old devices have chip data hardcoded in the device ID table. nand_decode_id - * decodes a matching ID table entry and assigns the MTD size parameters for - * the chip. - */ -static void nand_decode_id(struct mtd_info *mtd, struct nand_chip *chip, - struct nand_flash_dev *type, u8 id_data[8], - int *busw) -{ - int maf_id = id_data[0]; - - mtd->erasesize = type->erasesize; - mtd->writesize = type->pagesize; - mtd->oobsize = mtd->writesize / 32; - *busw = type->options & NAND_BUSWIDTH_16; - - /* All legacy ID NAND are small-page, SLC */ - chip->bits_per_cell = 1; - - /* - * Check for Spansion/AMD ID + repeating 5th, 6th byte since - * some Spansion chips have erasesize that conflicts with size - * listed in nand_ids table. - * Data sheet (5 byte ID): Spansion S30ML-P ORNAND (p.39) - */ - if (maf_id == NAND_MFR_AMD && id_data[4] != 0x00 && id_data[5] == 0x00 - && id_data[6] == 0x00 && id_data[7] == 0x00 - && mtd->writesize == 512) { - mtd->erasesize = 128 * 1024; - mtd->erasesize <<= ((id_data[3] & 0x03) << 1); - } -} - -/* - * Set the bad block marker/indicator (BBM/BBI) patterns according to some - * heuristic patterns using various detected parameters (e.g., manufacturer, - * page size, cell-type information). - */ -static void nand_decode_bbm_options(struct mtd_info *mtd, - struct nand_chip *chip, u8 id_data[8]) -{ - int maf_id = id_data[0]; - - /* Set the bad block position */ - if (mtd->writesize > 512 || (chip->options & NAND_BUSWIDTH_16)) - chip->badblockpos = NAND_LARGE_BADBLOCK_POS; - else - chip->badblockpos = NAND_SMALL_BADBLOCK_POS; - - /* - * Bad block marker is stored in the last page of each block on Samsung - * and Hynix MLC devices; stored in first two pages of each block on - * Micron devices with 2KiB pages and on SLC Samsung, Hynix, Toshiba, - * AMD/Spansion, and Macronix. All others scan only the first page. - */ - if (!nand_is_slc(chip) && - (maf_id == NAND_MFR_SAMSUNG || - maf_id == NAND_MFR_HYNIX)) - chip->bbt_options |= NAND_BBT_SCANLASTPAGE; - else if ((nand_is_slc(chip) && - (maf_id == NAND_MFR_SAMSUNG || - maf_id == NAND_MFR_HYNIX || - maf_id == NAND_MFR_TOSHIBA || - maf_id == NAND_MFR_AMD || - maf_id == NAND_MFR_MACRONIX)) || - (mtd->writesize == 2048 && - maf_id == NAND_MFR_MICRON)) - chip->bbt_options |= NAND_BBT_SCAN2NDPAGE; -} - -static inline bool is_full_id_nand(struct nand_flash_dev *type) -{ - return type->id_len; -} - -static bool find_full_id_nand(struct mtd_info *mtd, struct nand_chip *chip, - struct nand_flash_dev *type, u8 *id_data, int *busw) -{ - if (!strncmp(type->id, id_data, type->id_len)) { - mtd->writesize = type->pagesize; - mtd->erasesize = type->erasesize; - mtd->oobsize = type->oobsize; - - chip->bits_per_cell = nand_get_bits_per_cell(id_data[2]); - chip->chipsize = (uint64_t)type->chipsize << 20; - chip->options |= type->options; - - *busw = type->options & NAND_BUSWIDTH_16; - - return true; - } - return false; -} - -/* - * 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, int *dev_id, - struct nand_flash_dev *type) -{ - int i, maf_idx; - u8 id_data[8]; - - /* 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 entire ID string */ - for (i = 0; i < 8; i++) - id_data[i] = chip->read_byte(mtd); - - if (id_data[0] != *maf_id || id_data[1] != *dev_id) { - pr_info("%s: second ID read did not match " - "%02x,%02x against %02x,%02x\n", __func__, - *maf_id, *dev_id, id_data[0], id_data[1]); - return ERR_PTR(-ENODEV); - } - - if (!type) - type = nand_flash_ids; - - for (; type->name != NULL; type++) { - if (is_full_id_nand(type)) { - if (find_full_id_nand(mtd, chip, type, id_data, &busw)) - goto ident_done; - } else if (*dev_id == type->dev_id) { - break; - } - } - - chip->onfi_version = 0; - if (!type->name || !type->pagesize) { - /* Check is chip is ONFI compliant */ - if (nand_flash_detect_onfi(mtd, chip, &busw)) - goto ident_done; - } - - if (!type->name) - return ERR_PTR(-ENODEV); - - if (!mtd->name) - mtd->name = type->name; - - chip->chipsize = (uint64_t)type->chipsize << 20; - - if (!type->pagesize && chip->init_size) { - /* Set the pagesize, oobsize, erasesize by the driver */ - busw = chip->init_size(mtd, chip, id_data); - } else if (!type->pagesize) { - /* Decode parameters from extended ID */ - nand_decode_ext_id(mtd, chip, id_data, &busw); - } else { - nand_decode_id(mtd, chip, type, id_data, &busw); - } - /* Get chip options */ - chip->options |= type->options; - - /* - * Check if chip is not a Samsung device. Do not clear the - * options for chips which do not have an extended id. - */ - if (*maf_id != NAND_MFR_SAMSUNG && !type->pagesize) - chip->options &= ~NAND_SAMSUNG_LP_OPTIONS; -ident_done: - - /* 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; - } - - if (chip->options & NAND_BUSWIDTH_AUTO) { - WARN_ON(chip->options & NAND_BUSWIDTH_16); - chip->options |= busw; - nand_set_defaults(chip, busw); - } else if (busw != (chip->options & NAND_BUSWIDTH_16)) { - /* - * Check, if buswidth is correct. Hardware drivers should set - * chip correct! - */ - pr_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); - pr_warn("NAND bus width %d instead %d bit\n", - (chip->options & NAND_BUSWIDTH_16) ? 16 : 8, - busw ? 16 : 8); - return ERR_PTR(-EINVAL); - } - - nand_decode_bbm_options(mtd, chip, id_data); - - /* 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; - } - - chip->badblockbits = 8; - chip->erase_cmd = single_erase_cmd; - - /* Do not replace user supplied command function! */ - if (mtd->writesize > 512 && chip->cmdfunc == nand_command) - chip->cmdfunc = nand_command_lp; - - pr_info("NAND device: Manufacturer ID: 0x%02x, Chip ID: 0x%02x (%s %s)," - " %dMiB, 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, - (int)(chip->chipsize >> 20), mtd->writesize, mtd->oobsize); - - return type; -} - -/** - * nand_of_parse_node - parse generic NAND properties - * @mtd: MTD device structure - * @np: Device node to read information from - * - * This parses device tree properties generic to NAND controllers and fills in - * the various fields in struct nand_chip. - */ -void nand_of_parse_node(struct mtd_info *mtd, struct device_node *np) -{ - struct nand_chip *chip = mtd_to_nand(mtd); - int ecc_strength, ecc_size; - - if (!IS_ENABLED(CONFIG_OFDEVICE)) - return; - - ecc_strength = of_get_nand_ecc_strength(np); - ecc_size = of_get_nand_ecc_step_size(np); - - if (ecc_strength >= 0) - chip->ecc.strength = ecc_strength; - - if (ecc_size >= 0) - chip->ecc.size = ecc_size; -} - -/** - * nand_scan_ident - [NAND Interface] Scan for the NAND device - * @mtd: MTD device structure - * @maxchips: number of chips to scan for - * @table: alternative NAND ID table - * - * 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, - struct nand_flash_dev *table) -{ - int i, busw, nand_maf_id, nand_dev_id; - struct nand_chip *chip = mtd_to_nand(mtd); - 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, &nand_dev_id, table); - - if (IS_ERR(type)) { - if (!(chip->options & NAND_SCAN_SILENT_NODEV)) - pr_warn("No NAND device found\n"); - chip->select_chip(mtd, -1); - return PTR_ERR(type); - } - - chip->select_chip(mtd, -1); - - /* Check for a chip array */ - for (i = 1; i < maxchips; i++) { - chip->select_chip(mtd, i); - /* See comment in nand_get_flash_type for reset */ - 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 */ - if (nand_maf_id != chip->read_byte(mtd) || - nand_dev_id != chip->read_byte(mtd)) { - chip->select_chip(mtd, -1); - break; - } - chip->select_chip(mtd, -1); - } - if (i > 1) - pr_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; -} -EXPORT_SYMBOL(nand_scan_ident); - - -/** - * nand_scan_tail - [NAND Interface] Scan for the NAND device - * @mtd: MTD device structure - * - * 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_to_nand(mtd); - - /* New bad blocks should be marked in OOB, flash-based BBT, or both */ - BUG_ON((chip->bbt_options & NAND_BBT_NO_OOB_BBM) && - !(chip->bbt_options & NAND_BBT_USE_FLASH)); - - 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; - default: - pr_warn("No oob scheme defined for oobsize %d\n", - mtd->oobsize); - BUG(); - } - } - - if (!chip->write_page) - chip->write_page = nand_write_page; - - /* - * Check ECC mode, default to software if 3byte/512byte hardware ECC is - * selected and we have 256 byte pagesize fallback to software ECC - */ - - switch (chip->ecc.mode) { -#ifdef CONFIG_NAND_ECC_HW_OOB_FIRST - case NAND_ECC_HW_OOB_FIRST: - /* Similar to NAND_ECC_HW, but a separate read_page handle */ - if (!chip->ecc.calculate || !chip->ecc.correct || - !chip->ecc.hwctl) { - pr_warn("No ECC functions supplied; hardware ECC not possible\n"); - BUG(); - } - if (!chip->ecc.read_page) - chip->ecc.read_page = nand_read_page_hwecc_oob_first; - if (!chip->ecc.write_page) - chip->ecc.write_page = nand_write_page_hwecc; - if (!chip->ecc.read_page_raw) - chip->ecc.read_page_raw = nand_read_page_raw; - if (!chip->ecc.write_page_raw) - chip->ecc.write_page_raw = nand_write_page_raw; - if (!chip->ecc.read_oob) - chip->ecc.read_oob = nand_read_oob_std; - if (!chip->ecc.write_oob) - chip->ecc.write_oob = nand_write_oob_std; - if (!chip->ecc.read_subpage) - chip->ecc.read_subpage = nand_read_subpage; - if (!chip->ecc.write_subpage) - chip->ecc.write_subpage = nand_write_subpage_hwecc; - break; -#endif -#ifdef CONFIG_NAND_ECC_HW - case NAND_ECC_HW: - /* Use standard hwecc read page function? */ - if (!chip->ecc.read_page) - chip->ecc.read_page = nand_read_page_hwecc; - if (!chip->ecc.write_page) - chip->ecc.write_page = nand_write_page_hwecc; - if (!chip->ecc.read_page_raw) - chip->ecc.read_page_raw = nand_read_page_raw; - if (!chip->ecc.write_page_raw) - chip->ecc.write_page_raw = nand_write_page_raw; - if (!chip->ecc.read_oob) - chip->ecc.read_oob = nand_read_oob_std; - if (!chip->ecc.write_oob) - chip->ecc.write_oob = nand_write_oob_std; - if (!chip->ecc.read_subpage) - chip->ecc.read_subpage = nand_read_subpage; - if (!chip->ecc.write_subpage) - chip->ecc.write_subpage = nand_write_subpage_hwecc; - break; -#endif -#ifdef CONFIG_NAND_ECC_HW_SYNDROME - case NAND_ECC_HW_SYNDROME: - /* Use standard syndrome read/write page function? */ - if (!chip->ecc.read_page) - chip->ecc.read_page = nand_read_page_syndrome; - if (!chip->ecc.write_page) - chip->ecc.write_page = nand_write_page_syndrome; - if (!chip->ecc.read_page_raw) - chip->ecc.read_page_raw = nand_read_page_raw_syndrome; - if (!chip->ecc.write_page_raw) - chip->ecc.write_page_raw = nand_write_page_raw_syndrome; - if (!chip->ecc.read_oob) - chip->ecc.read_oob = nand_read_oob_syndrome; - if (!chip->ecc.write_oob) - chip->ecc.write_oob = nand_write_oob_syndrome; - break; -#endif -#ifdef CONFIG_NAND_ECC_SOFT - case NAND_ECC_SOFT: - chip->ecc.calculate = nand_calculate_ecc; - chip->ecc.correct = nand_correct_data; - chip->ecc.read_page = nand_read_page_swecc; - chip->ecc.read_subpage = nand_read_subpage; - chip->ecc.write_page = nand_write_page_swecc; - chip->ecc.read_page_raw = nand_read_page_raw; - chip->ecc.write_page_raw = nand_write_page_raw; - chip->ecc.read_oob = nand_read_oob_std; - chip->ecc.write_oob = nand_write_oob_std; - if (!chip->ecc.size) - chip->ecc.size = 256; - chip->ecc.bytes = 3; - chip->ecc.strength = 1; - break; -#endif -#ifdef CONFIG_NAND_ECC_BCH - 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; - chip->ecc.write_page = nand_write_page_swecc; - chip->ecc.read_page_raw = nand_read_page_raw; - chip->ecc.write_page_raw = nand_write_page_raw; - chip->ecc.read_oob = nand_read_oob_std; - chip->ecc.write_oob = nand_write_oob_std; - /* - * Board driver should supply ecc.size and ecc.strength values - * to select how many bits are correctable. Otherwise, default - * to 4 bits for large page devices. - */ - if (!chip->ecc.size && (mtd->oobsize >= 64)) { - chip->ecc.size = 512; - chip->ecc.strength = 4; - } - - /* See nand_bch_init() for details. */ - chip->ecc.bytes = 0; - chip->ecc.priv = nand_bch_init(mtd); - if (!chip->ecc.priv) { - pr_warn("BCH ECC initialization failed!\n"); - BUG(); - } - break; -#endif -#ifdef CONFIG_NAND_ECC_NONE - case NAND_ECC_NONE: - pr_warn("NAND_ECC_NONE selected by board driver. This is not recommended!\n"); - chip->ecc.read_page = nand_read_page_raw; - chip->ecc.write_page = nand_write_page_raw; - chip->ecc.read_oob = nand_read_oob_std; - chip->ecc.read_page_raw = nand_read_page_raw; - chip->ecc.write_page_raw = nand_write_page_raw; - chip->ecc.write_oob = nand_write_oob_std; - chip->ecc.size = mtd->writesize; - chip->ecc.bytes = 0; - chip->ecc.strength = 0; - break; -#endif - default: - pr_warn("Invalid NAND_ECC_MODE %d\n", chip->ecc.mode); - BUG(); - } - - /* For many systems, the standard OOB write also works for raw */ - if (!chip->ecc.read_oob_raw) - chip->ecc.read_oob_raw = chip->ecc.read_oob; - if (!chip->ecc.write_oob_raw) - chip->ecc.write_oob_raw = chip->ecc.write_oob; - - /* - * 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 < ARRAY_SIZE(chip->ecc.layout->oobfree); 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) { - pr_warn("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) && nand_is_slc(chip)) { - switch (chip->ecc.steps) { - case 2: - mtd->subpage_sft = 1; - break; - case 4: - case 8: - case 16: - mtd->subpage_sft = 2; - break; - } - } - chip->subpagesize = mtd->writesize >> mtd->subpage_sft; - - /* Initialize state */ - chip->state = FL_READY; - - /* Invalidate the pagebuffer reference */ - chip->pagebuf = -1; - - /* Large page NAND with SOFT_ECC should support subpage reads */ - if ((chip->ecc.mode == NAND_ECC_SOFT) && (chip->page_shift > 9)) - chip->options |= NAND_SUBPAGE_READ; - - /* Fill in remaining MTD driver data */ - mtd->type = MTD_NANDFLASH; - mtd->flags = (chip->options & NAND_ROM) ? MTD_CAP_ROM : - MTD_CAP_NANDFLASH; - mtd->erase = nand_erase; - mtd->read = nand_read; - mtd->write = nand_write; - mtd->read_oob = nand_read_oob; - mtd->write_oob = nand_write_oob; - mtd->sync = nand_sync; - mtd->lock = NULL; - mtd->unlock = NULL; - mtd->block_isbad = nand_block_isbad; - mtd->block_markbad = nand_block_markbad; - mtd->block_markgood = nand_block_markgood; - mtd->writebufsize = mtd->writesize; - - /* propagate ecc info to mtd_info */ - mtd->ecclayout = chip->ecc.layout; - mtd->ecc_strength = chip->ecc.strength; - /* - * Initialize bitflip_threshold to its default prior scan_bbt() call. - * scan_bbt() might invoke mtd_read(), thus bitflip_threshold must be - * properly set. - */ - if (!mtd->bitflip_threshold) - mtd->bitflip_threshold = DIV_ROUND_UP(mtd->ecc_strength * 3, 4); - - /* Check, if we should skip the bad block table scan */ - if (chip->options & NAND_SKIP_BBTSCAN) - return 0; - - if (!IS_ENABLED(CONFIG_NAND_BBT)) - return 0; - - /* Build bad block table */ - return chip->scan_bbt(mtd); -} -EXPORT_SYMBOL(nand_scan_tail); - -/** - * 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, NULL); - if (!ret) - ret = nand_scan_tail(mtd); - return ret; -} -EXPORT_SYMBOL(nand_scan); - -/** - * 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_to_nand(mtd); - - if (chip->ecc.mode == NAND_ECC_SOFT_BCH) - nand_bch_free((struct nand_bch_control *)chip->ecc.priv); - - del_mtd_device(mtd); - - /* Free bad block table memory */ - kfree(chip->bbt); - if (!(chip->options & NAND_OWN_BUFFERS)) - kfree(chip->buffers); - - /* Free bad block descriptor memory */ - if (chip->badblock_pattern && chip->badblock_pattern->options - & NAND_BBT_DYNAMICSTRUCT) - kfree(chip->badblock_pattern); -} -EXPORT_SYMBOL_GPL(nand_release); - -static int mtd_set_erasebad(struct param_d *param, void *priv) -{ - struct mtd_info *mtd = priv; - - if (!mtd->p_allow_erasebad) { - mtd->allow_erasebad = false; - return 0; - } - - if (!mtd->allow_erasebad) - dev_warn(&mtd->class_dev, - "Allowing to erase bad blocks. This may be dangerous!\n"); - - mtd->allow_erasebad = true; - - return 0; -} - -enum bbt_type { - BBT_TYPE_NONE = 0, - BBT_TYPE_FLASHBASED, - BBT_TYPE_MEMORYBASED, -}; - -static const char *bbt_type_strings[] = { - [BBT_TYPE_NONE] = "none", - [BBT_TYPE_FLASHBASED] = "flashbased", - [BBT_TYPE_MEMORYBASED] = "memorybased", -}; - -static int mtd_get_bbt_type(struct param_d *p, void *priv) -{ - struct mtd_info *mtd = priv; - struct nand_chip *chip = mtd_to_nand(mtd); - enum bbt_type type; - - if (!chip->bbt) - type = BBT_TYPE_NONE; - else if ((chip->bbt_td && chip->bbt_td->pages[0] != -1) || - (chip->bbt_md && chip->bbt_md->pages[0] != -1)) - type = BBT_TYPE_FLASHBASED; - else - type = BBT_TYPE_MEMORYBASED; - - chip->bbt_type = type; - - return 0; -} - -int add_mtd_nand_device(struct mtd_info *mtd, char *devname) -{ - struct nand_chip *chip = mtd_to_nand(mtd); - int ret; - - ret = add_mtd_device(mtd, devname, DEVICE_ID_DYNAMIC); - if (ret) - return ret; - - if (IS_ENABLED(CONFIG_NAND_ALLOW_ERASE_BAD)) - dev_add_param_bool(&mtd->class_dev, "erasebad", mtd_set_erasebad, - NULL, &mtd->p_allow_erasebad, mtd); - - dev_add_param_enum(&mtd->class_dev, "bbt", NULL, mtd_get_bbt_type, - &chip->bbt_type, bbt_type_strings, - ARRAY_SIZE(bbt_type_strings), - mtd); - - dev_add_param_uint32_ro(&mtd->class_dev, "ecc.bytes", &chip->ecc.bytes, "%u"); - dev_add_param_uint32_ro(&mtd->class_dev, "ecc.strength", &chip->ecc.strength, "%u"); - dev_add_param_uint32_ro(&mtd->class_dev, "ecc.size", &chip->ecc.size, "%u"); - - return ret; -} |