| /* |
| * Copyright (c) 2003-2013 Broadcom Corporation |
| * |
| * Copyright (c) 2009-2010 Micron Technology, Inc. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version 2 |
| * of the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/delay.h> |
| #include <linux/mtd/mtd.h> |
| #include <linux/mtd/partitions.h> |
| #include <linux/mtd/nand.h> |
| #include <linux/spi/spi.h> |
| |
| #include "mt29f_spinand.h" |
| |
| #define BUFSIZE (10 * 64 * 2048) |
| #define CACHE_BUF 2112 |
| /* |
| * OOB area specification layout: Total 32 available free bytes. |
| */ |
| |
| static inline struct spinand_state *mtd_to_state(struct mtd_info *mtd) |
| { |
| struct nand_chip *chip = (struct nand_chip *)mtd->priv; |
| struct spinand_info *info = (struct spinand_info *)chip->priv; |
| struct spinand_state *state = (struct spinand_state *)info->priv; |
| |
| return state; |
| } |
| |
| #ifdef CONFIG_MTD_SPINAND_ONDIEECC |
| static int enable_hw_ecc; |
| static int enable_read_hw_ecc; |
| |
| static struct nand_ecclayout spinand_oob_64 = { |
| .eccbytes = 24, |
| .eccpos = { |
| 1, 2, 3, 4, 5, 6, |
| 17, 18, 19, 20, 21, 22, |
| 33, 34, 35, 36, 37, 38, |
| 49, 50, 51, 52, 53, 54, }, |
| .oobavail = 32, |
| .oobfree = { |
| {.offset = 8, |
| .length = 8}, |
| {.offset = 24, |
| .length = 8}, |
| {.offset = 40, |
| .length = 8}, |
| {.offset = 56, |
| .length = 8}, |
| } |
| }; |
| #endif |
| |
| /* |
| * spinand_cmd - to process a command to send to the SPI Nand |
| * Description: |
| * Set up the command buffer to send to the SPI controller. |
| * The command buffer has to initialized to 0. |
| */ |
| |
| static int spinand_cmd(struct spi_device *spi, struct spinand_cmd *cmd) |
| { |
| struct spi_message message; |
| struct spi_transfer x[4]; |
| u8 dummy = 0xff; |
| |
| spi_message_init(&message); |
| memset(x, 0, sizeof(x)); |
| |
| x[0].len = 1; |
| x[0].tx_buf = &cmd->cmd; |
| spi_message_add_tail(&x[0], &message); |
| |
| if (cmd->n_addr) { |
| x[1].len = cmd->n_addr; |
| x[1].tx_buf = cmd->addr; |
| spi_message_add_tail(&x[1], &message); |
| } |
| |
| if (cmd->n_dummy) { |
| x[2].len = cmd->n_dummy; |
| x[2].tx_buf = &dummy; |
| spi_message_add_tail(&x[2], &message); |
| } |
| |
| if (cmd->n_tx) { |
| x[3].len = cmd->n_tx; |
| x[3].tx_buf = cmd->tx_buf; |
| spi_message_add_tail(&x[3], &message); |
| } |
| |
| if (cmd->n_rx) { |
| x[3].len = cmd->n_rx; |
| x[3].rx_buf = cmd->rx_buf; |
| spi_message_add_tail(&x[3], &message); |
| } |
| |
| return spi_sync(spi, &message); |
| } |
| |
| /* |
| * spinand_read_id- Read SPI Nand ID |
| * Description: |
| * Read ID: read two ID bytes from the SPI Nand device |
| */ |
| static int spinand_read_id(struct spi_device *spi_nand, u8 *id) |
| { |
| int retval; |
| u8 nand_id[3]; |
| struct spinand_cmd cmd = {0}; |
| |
| cmd.cmd = CMD_READ_ID; |
| cmd.n_rx = 3; |
| cmd.rx_buf = &nand_id[0]; |
| |
| retval = spinand_cmd(spi_nand, &cmd); |
| if (retval < 0) { |
| dev_err(&spi_nand->dev, "error %d reading id\n", retval); |
| return retval; |
| } |
| id[0] = nand_id[1]; |
| id[1] = nand_id[2]; |
| return retval; |
| } |
| |
| /* |
| * spinand_read_status- send command 0xf to the SPI Nand status register |
| * Description: |
| * After read, write, or erase, the Nand device is expected to set the |
| * busy status. |
| * This function is to allow reading the status of the command: read, |
| * write, and erase. |
| * Once the status turns to be ready, the other status bits also are |
| * valid status bits. |
| */ |
| static int spinand_read_status(struct spi_device *spi_nand, uint8_t *status) |
| { |
| struct spinand_cmd cmd = {0}; |
| int ret; |
| |
| cmd.cmd = CMD_READ_REG; |
| cmd.n_addr = 1; |
| cmd.addr[0] = REG_STATUS; |
| cmd.n_rx = 1; |
| cmd.rx_buf = status; |
| |
| ret = spinand_cmd(spi_nand, &cmd); |
| if (ret < 0) |
| dev_err(&spi_nand->dev, "err: %d read status register\n", ret); |
| |
| return ret; |
| } |
| |
| #define MAX_WAIT_JIFFIES (40 * HZ) |
| static int wait_till_ready(struct spi_device *spi_nand) |
| { |
| unsigned long deadline; |
| int retval; |
| u8 stat = 0; |
| |
| deadline = jiffies + MAX_WAIT_JIFFIES; |
| do { |
| retval = spinand_read_status(spi_nand, &stat); |
| if (retval < 0) |
| return -1; |
| else if (!(stat & 0x1)) |
| break; |
| |
| cond_resched(); |
| } while (!time_after_eq(jiffies, deadline)); |
| |
| if ((stat & 0x1) == 0) |
| return 0; |
| |
| return -1; |
| } |
| /** |
| * spinand_get_otp- send command 0xf to read the SPI Nand OTP register |
| * Description: |
| * There is one bit( bit 0x10 ) to set or to clear the internal ECC. |
| * Enable chip internal ECC, set the bit to 1 |
| * Disable chip internal ECC, clear the bit to 0 |
| */ |
| static int spinand_get_otp(struct spi_device *spi_nand, u8 *otp) |
| { |
| struct spinand_cmd cmd = {0}; |
| int retval; |
| |
| cmd.cmd = CMD_READ_REG; |
| cmd.n_addr = 1; |
| cmd.addr[0] = REG_OTP; |
| cmd.n_rx = 1; |
| cmd.rx_buf = otp; |
| |
| retval = spinand_cmd(spi_nand, &cmd); |
| if (retval < 0) |
| dev_err(&spi_nand->dev, "error %d get otp\n", retval); |
| return retval; |
| } |
| |
| /** |
| * spinand_set_otp- send command 0x1f to write the SPI Nand OTP register |
| * Description: |
| * There is one bit( bit 0x10 ) to set or to clear the internal ECC. |
| * Enable chip internal ECC, set the bit to 1 |
| * Disable chip internal ECC, clear the bit to 0 |
| */ |
| static int spinand_set_otp(struct spi_device *spi_nand, u8 *otp) |
| { |
| int retval; |
| struct spinand_cmd cmd = {0}; |
| |
| cmd.cmd = CMD_WRITE_REG, |
| cmd.n_addr = 1, |
| cmd.addr[0] = REG_OTP, |
| cmd.n_tx = 1, |
| cmd.tx_buf = otp, |
| |
| retval = spinand_cmd(spi_nand, &cmd); |
| if (retval < 0) |
| dev_err(&spi_nand->dev, "error %d set otp\n", retval); |
| |
| return retval; |
| } |
| |
| #ifdef CONFIG_MTD_SPINAND_ONDIEECC |
| /** |
| * spinand_enable_ecc- send command 0x1f to write the SPI Nand OTP register |
| * Description: |
| * There is one bit( bit 0x10 ) to set or to clear the internal ECC. |
| * Enable chip internal ECC, set the bit to 1 |
| * Disable chip internal ECC, clear the bit to 0 |
| */ |
| static int spinand_enable_ecc(struct spi_device *spi_nand) |
| { |
| int retval; |
| u8 otp = 0; |
| |
| retval = spinand_get_otp(spi_nand, &otp); |
| if (retval < 0) |
| return retval; |
| |
| if ((otp & OTP_ECC_MASK) == OTP_ECC_MASK) |
| return 0; |
| otp |= OTP_ECC_MASK; |
| retval = spinand_set_otp(spi_nand, &otp); |
| if (retval < 0) |
| return retval; |
| return spinand_get_otp(spi_nand, &otp); |
| } |
| #endif |
| |
| static int spinand_disable_ecc(struct spi_device *spi_nand) |
| { |
| int retval; |
| u8 otp = 0; |
| |
| retval = spinand_get_otp(spi_nand, &otp); |
| if (retval < 0) |
| return retval; |
| |
| if ((otp & OTP_ECC_MASK) == OTP_ECC_MASK) { |
| otp &= ~OTP_ECC_MASK; |
| retval = spinand_set_otp(spi_nand, &otp); |
| if (retval < 0) |
| return retval; |
| return spinand_get_otp(spi_nand, &otp); |
| } |
| return 0; |
| } |
| |
| /** |
| * spinand_write_enable- send command 0x06 to enable write or erase the |
| * Nand cells |
| * Description: |
| * Before write and erase the Nand cells, the write enable has to be set. |
| * After the write or erase, the write enable bit is automatically |
| * cleared (status register bit 2) |
| * Set the bit 2 of the status register has the same effect |
| */ |
| static int spinand_write_enable(struct spi_device *spi_nand) |
| { |
| struct spinand_cmd cmd = {0}; |
| |
| cmd.cmd = CMD_WR_ENABLE; |
| return spinand_cmd(spi_nand, &cmd); |
| } |
| |
| static int spinand_read_page_to_cache(struct spi_device *spi_nand, u16 page_id) |
| { |
| struct spinand_cmd cmd = {0}; |
| u16 row; |
| |
| row = page_id; |
| cmd.cmd = CMD_READ; |
| cmd.n_addr = 3; |
| cmd.addr[1] = (u8)((row & 0xff00) >> 8); |
| cmd.addr[2] = (u8)(row & 0x00ff); |
| |
| return spinand_cmd(spi_nand, &cmd); |
| } |
| |
| /* |
| * spinand_read_from_cache- send command 0x03 to read out the data from the |
| * cache register(2112 bytes max) |
| * Description: |
| * The read can specify 1 to 2112 bytes of data read at the corresponding |
| * locations. |
| * No tRd delay. |
| */ |
| static int spinand_read_from_cache(struct spi_device *spi_nand, u16 page_id, |
| u16 byte_id, u16 len, u8 *rbuf) |
| { |
| struct spinand_cmd cmd = {0}; |
| u16 column; |
| |
| column = byte_id; |
| cmd.cmd = CMD_READ_RDM; |
| cmd.n_addr = 3; |
| cmd.addr[0] = (u8)((column & 0xff00) >> 8); |
| cmd.addr[0] |= (u8)(((page_id >> 6) & 0x1) << 4); |
| cmd.addr[1] = (u8)(column & 0x00ff); |
| cmd.addr[2] = (u8)(0xff); |
| cmd.n_dummy = 0; |
| cmd.n_rx = len; |
| cmd.rx_buf = rbuf; |
| |
| return spinand_cmd(spi_nand, &cmd); |
| } |
| |
| /* |
| * spinand_read_page-to read a page with: |
| * @page_id: the physical page number |
| * @offset: the location from 0 to 2111 |
| * @len: number of bytes to read |
| * @rbuf: read buffer to hold @len bytes |
| * |
| * Description: |
| * The read includes two commands to the Nand: 0x13 and 0x03 commands |
| * Poll to read status to wait for tRD time. |
| */ |
| static int spinand_read_page(struct spi_device *spi_nand, u16 page_id, |
| u16 offset, u16 len, u8 *rbuf) |
| { |
| int ret; |
| u8 status = 0; |
| |
| #ifdef CONFIG_MTD_SPINAND_ONDIEECC |
| if (enable_read_hw_ecc) { |
| if (spinand_enable_ecc(spi_nand) < 0) |
| dev_err(&spi_nand->dev, "enable HW ECC failed!"); |
| } |
| #endif |
| ret = spinand_read_page_to_cache(spi_nand, page_id); |
| if (ret < 0) |
| return ret; |
| |
| if (wait_till_ready(spi_nand)) |
| dev_err(&spi_nand->dev, "WAIT timedout!!!\n"); |
| |
| while (1) { |
| ret = spinand_read_status(spi_nand, &status); |
| if (ret < 0) { |
| dev_err(&spi_nand->dev, |
| "err %d read status register\n", ret); |
| return ret; |
| } |
| |
| if ((status & STATUS_OIP_MASK) == STATUS_READY) { |
| if ((status & STATUS_ECC_MASK) == STATUS_ECC_ERROR) { |
| dev_err(&spi_nand->dev, "ecc error, page=%d\n", |
| page_id); |
| return 0; |
| } |
| break; |
| } |
| } |
| |
| ret = spinand_read_from_cache(spi_nand, page_id, offset, len, rbuf); |
| if (ret < 0) { |
| dev_err(&spi_nand->dev, "read from cache failed!!\n"); |
| return ret; |
| } |
| |
| #ifdef CONFIG_MTD_SPINAND_ONDIEECC |
| if (enable_read_hw_ecc) { |
| ret = spinand_disable_ecc(spi_nand); |
| if (ret < 0) { |
| dev_err(&spi_nand->dev, "disable ecc failed!!\n"); |
| return ret; |
| } |
| enable_read_hw_ecc = 0; |
| } |
| #endif |
| return ret; |
| } |
| |
| /* |
| * spinand_program_data_to_cache--to write a page to cache with: |
| * @byte_id: the location to write to the cache |
| * @len: number of bytes to write |
| * @rbuf: read buffer to hold @len bytes |
| * |
| * Description: |
| * The write command used here is 0x84--indicating that the cache is |
| * not cleared first. |
| * Since it is writing the data to cache, there is no tPROG time. |
| */ |
| static int spinand_program_data_to_cache(struct spi_device *spi_nand, |
| u16 page_id, u16 byte_id, u16 len, u8 *wbuf) |
| { |
| struct spinand_cmd cmd = {0}; |
| u16 column; |
| |
| column = byte_id; |
| cmd.cmd = CMD_PROG_PAGE_CLRCACHE; |
| cmd.n_addr = 2; |
| cmd.addr[0] = (u8)((column & 0xff00) >> 8); |
| cmd.addr[0] |= (u8)(((page_id >> 6) & 0x1) << 4); |
| cmd.addr[1] = (u8)(column & 0x00ff); |
| cmd.n_tx = len; |
| cmd.tx_buf = wbuf; |
| |
| return spinand_cmd(spi_nand, &cmd); |
| } |
| |
| /** |
| * spinand_program_execute--to write a page from cache to the Nand array with |
| * @page_id: the physical page location to write the page. |
| * |
| * Description: |
| * The write command used here is 0x10--indicating the cache is writing to |
| * the Nand array. |
| * Need to wait for tPROG time to finish the transaction. |
| */ |
| static int spinand_program_execute(struct spi_device *spi_nand, u16 page_id) |
| { |
| struct spinand_cmd cmd = {0}; |
| u16 row; |
| |
| row = page_id; |
| cmd.cmd = CMD_PROG_PAGE_EXC; |
| cmd.n_addr = 3; |
| cmd.addr[1] = (u8)((row & 0xff00) >> 8); |
| cmd.addr[2] = (u8)(row & 0x00ff); |
| |
| return spinand_cmd(spi_nand, &cmd); |
| } |
| |
| /** |
| * spinand_program_page--to write a page with: |
| * @page_id: the physical page location to write the page. |
| * @offset: the location from the cache starting from 0 to 2111 |
| * @len: the number of bytes to write |
| * @wbuf: the buffer to hold the number of bytes |
| * |
| * Description: |
| * The commands used here are 0x06, 0x84, and 0x10--indicating that |
| * the write enable is first sent, the write cache command, and the |
| * write execute command. |
| * Poll to wait for the tPROG time to finish the transaction. |
| */ |
| static int spinand_program_page(struct spi_device *spi_nand, |
| u16 page_id, u16 offset, u16 len, u8 *buf) |
| { |
| int retval; |
| u8 status = 0; |
| uint8_t *wbuf; |
| #ifdef CONFIG_MTD_SPINAND_ONDIEECC |
| unsigned int i, j; |
| |
| enable_read_hw_ecc = 0; |
| wbuf = devm_kzalloc(&spi_nand->dev, CACHE_BUF, GFP_KERNEL); |
| spinand_read_page(spi_nand, page_id, 0, CACHE_BUF, wbuf); |
| |
| for (i = offset, j = 0; i < len; i++, j++) |
| wbuf[i] &= buf[j]; |
| |
| if (enable_hw_ecc) { |
| retval = spinand_enable_ecc(spi_nand); |
| if (retval < 0) { |
| dev_err(&spi_nand->dev, "enable ecc failed!!\n"); |
| return retval; |
| } |
| } |
| #else |
| wbuf = buf; |
| #endif |
| retval = spinand_write_enable(spi_nand); |
| if (retval < 0) { |
| dev_err(&spi_nand->dev, "write enable failed!!\n"); |
| return retval; |
| } |
| if (wait_till_ready(spi_nand)) |
| dev_err(&spi_nand->dev, "wait timedout!!!\n"); |
| |
| retval = spinand_program_data_to_cache(spi_nand, page_id, |
| offset, len, wbuf); |
| if (retval < 0) |
| return retval; |
| retval = spinand_program_execute(spi_nand, page_id); |
| if (retval < 0) |
| return retval; |
| while (1) { |
| retval = spinand_read_status(spi_nand, &status); |
| if (retval < 0) { |
| dev_err(&spi_nand->dev, |
| "error %d reading status register\n", |
| retval); |
| return retval; |
| } |
| |
| if ((status & STATUS_OIP_MASK) == STATUS_READY) { |
| if ((status & STATUS_P_FAIL_MASK) == STATUS_P_FAIL) { |
| dev_err(&spi_nand->dev, |
| "program error, page %d\n", page_id); |
| return -1; |
| } |
| break; |
| } |
| } |
| #ifdef CONFIG_MTD_SPINAND_ONDIEECC |
| if (enable_hw_ecc) { |
| retval = spinand_disable_ecc(spi_nand); |
| if (retval < 0) { |
| dev_err(&spi_nand->dev, "disable ecc failed!!\n"); |
| return retval; |
| } |
| enable_hw_ecc = 0; |
| } |
| #endif |
| |
| return 0; |
| } |
| |
| /** |
| * spinand_erase_block_erase--to erase a page with: |
| * @block_id: the physical block location to erase. |
| * |
| * Description: |
| * The command used here is 0xd8--indicating an erase command to erase |
| * one block--64 pages |
| * Need to wait for tERS. |
| */ |
| static int spinand_erase_block_erase(struct spi_device *spi_nand, u16 block_id) |
| { |
| struct spinand_cmd cmd = {0}; |
| u16 row; |
| |
| row = block_id; |
| cmd.cmd = CMD_ERASE_BLK; |
| cmd.n_addr = 3; |
| cmd.addr[1] = (u8)((row & 0xff00) >> 8); |
| cmd.addr[2] = (u8)(row & 0x00ff); |
| |
| return spinand_cmd(spi_nand, &cmd); |
| } |
| |
| /** |
| * spinand_erase_block--to erase a page with: |
| * @block_id: the physical block location to erase. |
| * |
| * Description: |
| * The commands used here are 0x06 and 0xd8--indicating an erase |
| * command to erase one block--64 pages |
| * It will first to enable the write enable bit (0x06 command), |
| * and then send the 0xd8 erase command |
| * Poll to wait for the tERS time to complete the tranaction. |
| */ |
| static int spinand_erase_block(struct spi_device *spi_nand, u16 block_id) |
| { |
| int retval; |
| u8 status = 0; |
| |
| retval = spinand_write_enable(spi_nand); |
| if (wait_till_ready(spi_nand)) |
| dev_err(&spi_nand->dev, "wait timedout!!!\n"); |
| |
| retval = spinand_erase_block_erase(spi_nand, block_id); |
| while (1) { |
| retval = spinand_read_status(spi_nand, &status); |
| if (retval < 0) { |
| dev_err(&spi_nand->dev, |
| "error %d reading status register\n", |
| (int) retval); |
| return retval; |
| } |
| |
| if ((status & STATUS_OIP_MASK) == STATUS_READY) { |
| if ((status & STATUS_E_FAIL_MASK) == STATUS_E_FAIL) { |
| dev_err(&spi_nand->dev, |
| "erase error, block %d\n", block_id); |
| return -1; |
| } |
| break; |
| } |
| } |
| return 0; |
| } |
| |
| #ifdef CONFIG_MTD_SPINAND_ONDIEECC |
| static int spinand_write_page_hwecc(struct mtd_info *mtd, |
| struct nand_chip *chip, const uint8_t *buf, int oob_required) |
| { |
| const uint8_t *p = buf; |
| int eccsize = chip->ecc.size; |
| int eccsteps = chip->ecc.steps; |
| |
| enable_hw_ecc = 1; |
| chip->write_buf(mtd, p, eccsize * eccsteps); |
| return 0; |
| } |
| |
| static int spinand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip, |
| uint8_t *buf, int oob_required, int page) |
| { |
| int retval; |
| u8 status; |
| uint8_t *p = buf; |
| int eccsize = chip->ecc.size; |
| int eccsteps = chip->ecc.steps; |
| struct spinand_info *info = (struct spinand_info *)chip->priv; |
| |
| enable_read_hw_ecc = 1; |
| |
| chip->read_buf(mtd, p, eccsize * eccsteps); |
| if (oob_required) |
| chip->read_buf(mtd, chip->oob_poi, mtd->oobsize); |
| |
| while (1) { |
| retval = spinand_read_status(info->spi, &status); |
| if (retval < 0) { |
| dev_err(&mtd->dev, |
| "error %d reading status register\n", |
| retval); |
| return retval; |
| } |
| |
| if ((status & STATUS_OIP_MASK) == STATUS_READY) { |
| if ((status & STATUS_ECC_MASK) == STATUS_ECC_ERROR) { |
| pr_info("spinand: ECC error\n"); |
| mtd->ecc_stats.failed++; |
| } else if ((status & STATUS_ECC_MASK) == |
| STATUS_ECC_1BIT_CORRECTED) |
| mtd->ecc_stats.corrected++; |
| break; |
| } |
| } |
| return 0; |
| |
| } |
| #endif |
| |
| static void spinand_select_chip(struct mtd_info *mtd, int dev) |
| { |
| } |
| |
| static uint8_t spinand_read_byte(struct mtd_info *mtd) |
| { |
| struct spinand_state *state = mtd_to_state(mtd); |
| u8 data; |
| |
| data = state->buf[state->buf_ptr]; |
| state->buf_ptr++; |
| return data; |
| } |
| |
| |
| static int spinand_wait(struct mtd_info *mtd, struct nand_chip *chip) |
| { |
| struct spinand_info *info = (struct spinand_info *)chip->priv; |
| |
| unsigned long timeo = jiffies; |
| int retval, state = chip->state; |
| u8 status; |
| |
| if (state == FL_ERASING) |
| timeo += (HZ * 400) / 1000; |
| else |
| timeo += (HZ * 20) / 1000; |
| |
| while (time_before(jiffies, timeo)) { |
| retval = spinand_read_status(info->spi, &status); |
| if (retval < 0) { |
| dev_err(&mtd->dev, |
| "error %d reading status register\n", |
| retval); |
| return retval; |
| } |
| |
| if ((status & STATUS_OIP_MASK) == STATUS_READY) |
| return 0; |
| |
| cond_resched(); |
| } |
| return 0; |
| } |
| |
| static void spinand_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len) |
| { |
| |
| struct spinand_state *state = mtd_to_state(mtd); |
| |
| memcpy(state->buf + state->buf_ptr, buf, len); |
| state->buf_ptr += len; |
| } |
| |
| static void spinand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len) |
| { |
| struct spinand_state *state = mtd_to_state(mtd); |
| |
| memcpy(buf, state->buf + state->buf_ptr, len); |
| state->buf_ptr += len; |
| } |
| |
| /* |
| * spinand_reset- send RESET command "0xff" to the Nand device. |
| */ |
| static void spinand_reset(struct spi_device *spi_nand) |
| { |
| struct spinand_cmd cmd = {0}; |
| |
| cmd.cmd = CMD_RESET; |
| |
| if (spinand_cmd(spi_nand, &cmd) < 0) |
| pr_info("spinand reset failed!\n"); |
| |
| /* elapse 1ms before issuing any other command */ |
| udelay(1000); |
| |
| if (wait_till_ready(spi_nand)) |
| dev_err(&spi_nand->dev, "wait timedout!\n"); |
| } |
| |
| static void spinand_cmdfunc(struct mtd_info *mtd, unsigned int command, |
| int column, int page) |
| { |
| struct nand_chip *chip = (struct nand_chip *)mtd->priv; |
| struct spinand_info *info = (struct spinand_info *)chip->priv; |
| struct spinand_state *state = (struct spinand_state *)info->priv; |
| |
| switch (command) { |
| /* |
| * READ0 - read in first 0x800 bytes |
| */ |
| case NAND_CMD_READ1: |
| case NAND_CMD_READ0: |
| state->buf_ptr = 0; |
| spinand_read_page(info->spi, page, 0x0, 0x840, state->buf); |
| break; |
| /* READOOB reads only the OOB because no ECC is performed. */ |
| case NAND_CMD_READOOB: |
| state->buf_ptr = 0; |
| spinand_read_page(info->spi, page, 0x800, 0x40, state->buf); |
| break; |
| case NAND_CMD_RNDOUT: |
| state->buf_ptr = column; |
| break; |
| case NAND_CMD_READID: |
| state->buf_ptr = 0; |
| spinand_read_id(info->spi, state->buf); |
| break; |
| case NAND_CMD_PARAM: |
| state->buf_ptr = 0; |
| break; |
| /* ERASE1 stores the block and page address */ |
| case NAND_CMD_ERASE1: |
| spinand_erase_block(info->spi, page); |
| break; |
| /* ERASE2 uses the block and page address from ERASE1 */ |
| case NAND_CMD_ERASE2: |
| break; |
| /* SEQIN sets up the addr buffer and all registers except the length */ |
| case NAND_CMD_SEQIN: |
| state->col = column; |
| state->row = page; |
| state->buf_ptr = 0; |
| break; |
| /* PAGEPROG reuses all of the setup from SEQIN and adds the length */ |
| case NAND_CMD_PAGEPROG: |
| spinand_program_page(info->spi, state->row, state->col, |
| state->buf_ptr, state->buf); |
| break; |
| case NAND_CMD_STATUS: |
| spinand_get_otp(info->spi, state->buf); |
| if (!(state->buf[0] & 0x80)) |
| state->buf[0] = 0x80; |
| state->buf_ptr = 0; |
| break; |
| /* RESET command */ |
| case NAND_CMD_RESET: |
| if (wait_till_ready(info->spi)) |
| dev_err(&info->spi->dev, "WAIT timedout!!!\n"); |
| /* a minimum of 250us must elapse before issuing RESET cmd*/ |
| udelay(250); |
| spinand_reset(info->spi); |
| break; |
| default: |
| dev_err(&mtd->dev, "Unknown CMD: 0x%x\n", command); |
| } |
| } |
| |
| /** |
| * spinand_lock_block- send write register 0x1f command to the Nand device |
| * |
| * Description: |
| * After power up, all the Nand blocks are locked. This function allows |
| * one to unlock the blocks, and so it can be written or erased. |
| */ |
| static int spinand_lock_block(struct spi_device *spi_nand, u8 lock) |
| { |
| struct spinand_cmd cmd = {0}; |
| int ret; |
| u8 otp = 0; |
| |
| ret = spinand_get_otp(spi_nand, &otp); |
| |
| cmd.cmd = CMD_WRITE_REG; |
| cmd.n_addr = 1; |
| cmd.addr[0] = REG_BLOCK_LOCK; |
| cmd.n_tx = 1; |
| cmd.tx_buf = &lock; |
| |
| ret = spinand_cmd(spi_nand, &cmd); |
| if (ret < 0) |
| dev_err(&spi_nand->dev, "error %d lock block\n", ret); |
| |
| return ret; |
| } |
| /* |
| * spinand_probe - [spinand Interface] |
| * @spi_nand: registered device driver. |
| * |
| * Description: |
| * To set up the device driver parameters to make the device available. |
| */ |
| static int spinand_probe(struct spi_device *spi_nand) |
| { |
| struct mtd_info *mtd; |
| struct nand_chip *chip; |
| struct spinand_info *info; |
| struct spinand_state *state; |
| struct mtd_part_parser_data ppdata; |
| |
| info = devm_kzalloc(&spi_nand->dev, sizeof(struct spinand_info), |
| GFP_KERNEL); |
| if (!info) |
| return -ENOMEM; |
| |
| info->spi = spi_nand; |
| |
| spinand_lock_block(spi_nand, BL_ALL_UNLOCKED); |
| |
| state = devm_kzalloc(&spi_nand->dev, sizeof(struct spinand_state), |
| GFP_KERNEL); |
| if (!state) |
| return -ENOMEM; |
| |
| info->priv = state; |
| state->buf_ptr = 0; |
| state->buf = devm_kzalloc(&spi_nand->dev, BUFSIZE, GFP_KERNEL); |
| if (!state->buf) |
| return -ENOMEM; |
| |
| chip = devm_kzalloc(&spi_nand->dev, sizeof(struct nand_chip), |
| GFP_KERNEL); |
| if (!chip) |
| return -ENOMEM; |
| |
| #ifdef CONFIG_MTD_SPINAND_ONDIEECC |
| chip->ecc.mode = NAND_ECC_HW; |
| chip->ecc.size = 0x200; |
| chip->ecc.bytes = 0x6; |
| chip->ecc.steps = 0x4; |
| |
| chip->ecc.strength = 1; |
| chip->ecc.total = chip->ecc.steps * chip->ecc.bytes; |
| chip->ecc.layout = &spinand_oob_64; |
| chip->ecc.read_page = spinand_read_page_hwecc; |
| chip->ecc.write_page = spinand_write_page_hwecc; |
| #else |
| chip->ecc.mode = NAND_ECC_SOFT; |
| if (spinand_disable_ecc(spi_nand) < 0) |
| pr_info("%s: disable ecc failed!\n", __func__); |
| #endif |
| |
| chip->priv = info; |
| chip->read_buf = spinand_read_buf; |
| chip->write_buf = spinand_write_buf; |
| chip->read_byte = spinand_read_byte; |
| chip->cmdfunc = spinand_cmdfunc; |
| chip->waitfunc = spinand_wait; |
| chip->options |= NAND_CACHEPRG; |
| chip->select_chip = spinand_select_chip; |
| |
| mtd = devm_kzalloc(&spi_nand->dev, sizeof(struct mtd_info), GFP_KERNEL); |
| if (!mtd) |
| return -ENOMEM; |
| |
| dev_set_drvdata(&spi_nand->dev, mtd); |
| |
| mtd->priv = chip; |
| mtd->name = dev_name(&spi_nand->dev); |
| mtd->owner = THIS_MODULE; |
| mtd->oobsize = 64; |
| |
| if (nand_scan(mtd, 1)) |
| return -ENXIO; |
| |
| ppdata.of_node = spi_nand->dev.of_node; |
| return mtd_device_parse_register(mtd, NULL, &ppdata, NULL, 0); |
| } |
| |
| /* |
| * spinand_remove: Remove the device driver |
| * @spi: the spi device. |
| * |
| * Description: |
| * To remove the device driver parameters and free up allocated memories. |
| */ |
| static int spinand_remove(struct spi_device *spi) |
| { |
| mtd_device_unregister(dev_get_drvdata(&spi->dev)); |
| |
| return 0; |
| } |
| |
| static const struct of_device_id spinand_dt[] = { |
| { .compatible = "spinand,mt29f", }, |
| {} |
| }; |
| |
| /* |
| * Device name structure description |
| */ |
| static struct spi_driver spinand_driver = { |
| .driver = { |
| .name = "mt29f", |
| .bus = &spi_bus_type, |
| .owner = THIS_MODULE, |
| .of_match_table = spinand_dt, |
| }, |
| .probe = spinand_probe, |
| .remove = spinand_remove, |
| }; |
| |
| module_spi_driver(spinand_driver); |
| |
| MODULE_DESCRIPTION("SPI NAND driver for Micron"); |
| MODULE_AUTHOR("Henry Pan <hspan@micron.com>, Kamlakant Patel <kamlakant.patel@broadcom.com>"); |
| MODULE_LICENSE("GPL v2"); |