diff options
Diffstat (limited to 'drivers/mtd/nand/nand_s3c24xx.c')
| -rw-r--r-- | drivers/mtd/nand/nand_s3c24xx.c | 660 |
1 files changed, 0 insertions, 660 deletions
diff --git a/drivers/mtd/nand/nand_s3c24xx.c b/drivers/mtd/nand/nand_s3c24xx.c deleted file mode 100644 index f1d1441f50..0000000000 --- a/drivers/mtd/nand/nand_s3c24xx.c +++ /dev/null @@ -1,660 +0,0 @@ -/* linux/drivers/mtd/nand/s3c2410.c - * - * Copyright (C) 2009 Juergen Beisert, Pengutronix - * - * Copyright © 2004-2008 Simtec Electronics - * http://armlinux.simtec.co.uk/ - * Ben Dooks <ben@simtec.co.uk> - * - * Samsung S3C2410 NAND driver - * - * 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 <config.h> -#include <common.h> -#include <driver.h> -#include <malloc.h> -#include <init.h> -#include <linux/mtd/mtd.h> -#include <linux/mtd/rawnand.h> -#include <linux/mtd/nand.h> -#include <mach/s3c-generic.h> -#include <mach/s3c-iomap.h> -#include <mach/s3c24xx-nand.h> -#include <io.h> -#include <errno.h> -#include <asm/sections.h> - -#ifdef CONFIG_S3C_NAND_BOOT -# define __nand_boot_init __bare_init -# ifndef BOARD_DEFAULT_NAND_TIMING -# define BOARD_DEFAULT_NAND_TIMING 0x0737 -# endif -#else -# define __nand_boot_init -#endif - -/** - * Define this symbol for testing purpose. It will add a command to read an - * image from the NAND like it the boot strap code will do. - */ -#define CONFIG_NAND_S3C_BOOT_DEBUG - -/* NAND controller's register */ - -#define NFCONF 0x00 - -#ifdef CONFIG_CPU_S3C2410 - -#define NFCMD 0x04 -#define NFADDR 0x08 -#define NFDATA 0x0c -#define NFSTAT 0x10 -#define NFECC 0x14 - -/* S3C2410 specific bits */ -#define NFSTAT_BUSY (1) -#define NFCONF_nFCE (1 << 11) -#define NFCONF_INITECC (1 << 12) -#define NFCONF_EN (1 << 15) - -#endif /* CONFIG_CPU_S3C2410 */ - -#ifdef CONFIG_CPU_S3C2440 - -#define NFCONT 0x04 -#define NFCMD 0x08 -#define NFADDR 0x0C -#define NFDATA 0x10 -#define NFSTAT 0x20 -#define NFECC 0x2C - -/* S3C2440 specific bits */ -#define NFSTAT_BUSY (1) -#define NFCONT_nFCE (1 << 1) -#define NFCONT_INITECC (1 << 4) -#define NFCONT_EN (1) - -#endif /* CONFIG_CPU_S3C2440 */ - - -struct s3c24x0_nand_host { - struct nand_chip nand; - struct mtd_partition *parts; - struct device_d *dev; - - void __iomem *base; -}; - -/** - * oob placement block for use with hardware ecc generation on small page - */ -static struct nand_ecclayout nand_hw_eccoob = { - .eccbytes = 3, - .eccpos = { 0, 1, 2}, - .oobfree = { - { - .offset = 8, - .length = 8 - } - } -}; - -/* - Functions shared between the boot strap code and the regular driver - */ - -/** - * Issue the specified command to the NAND device - * @param[in] host Base address of the NAND controller - * @param[in] cmd Command for NAND flash - */ -static void __nand_boot_init send_cmd(void __iomem *host, uint8_t cmd) -{ - writeb(cmd, host + NFCMD); -} - -/** - * Issue the specified address to the NAND device - * @param[in] host Base address of the NAND controller - * @param[in] addr Address for the NAND flash - */ -static void __nand_boot_init send_addr(void __iomem *host, uint8_t addr) -{ - writeb(addr, host + NFADDR); -} - -/** - * Enable the NAND flash access - * @param[in] host Base address of the NAND controller - */ -static void __nand_boot_init enable_cs(void __iomem *host) -{ -#ifdef CONFIG_CPU_S3C2410 - writew(readw(host + NFCONF) & ~NFCONF_nFCE, host + NFCONF); -#endif -#ifdef CONFIG_CPU_S3C2440 - writew(readw(host + NFCONT) & ~NFCONT_nFCE, host + NFCONT); -#endif -} - -/** - * Disable the NAND flash access - * @param[in] host Base address of the NAND controller - */ -static void __nand_boot_init disable_cs(void __iomem *host) -{ -#ifdef CONFIG_CPU_S3C2410 - writew(readw(host + NFCONF) | NFCONF_nFCE, host + NFCONF); -#endif -#ifdef CONFIG_CPU_S3C2440 - writew(readw(host + NFCONT) | NFCONT_nFCE, host + NFCONT); -#endif -} - -/** - * Enable the NAND flash controller - * @param[in] host Base address of the NAND controller - * @param[in] timing Timing to access the NAND memory - */ -static void __nand_boot_init enable_nand_controller(void __iomem *host, uint32_t timing) -{ -#ifdef CONFIG_CPU_S3C2410 - writew(timing + NFCONF_EN + NFCONF_nFCE, host + NFCONF); -#endif -#ifdef CONFIG_CPU_S3C2440 - writew(NFCONT_EN + NFCONT_nFCE, host + NFCONT); - writew(timing, host + NFCONF); -#endif -} - -/** - * Diable the NAND flash controller - * @param[in] host Base address of the NAND controller - */ -static void __nand_boot_init disable_nand_controller(void __iomem *host) -{ -#ifdef CONFIG_CPU_S3C2410 - writew(NFCONF_nFCE, host + NFCONF); -#endif -#ifdef CONFIG_CPU_S3C2440 - writew(NFCONT_nFCE, host + NFCONT); -#endif -} - -/* ----------------------------------------------------------------------- */ - -#ifdef CONFIG_CPU_S3C2440 -/** - * Read one block of data from the NAND port - * @param[in] mtd Instance data - * @param[out] buf buffer to write data to - * @param[in] len byte count - * - * This is a special block read variant for the S3C2440 CPU. - */ -static void s3c2440_nand_read_buf(struct nand_chip *chip, uint8_t *buf, int len) -{ - struct s3c24x0_nand_host *host = chip->priv; - - readsl(host->base + NFDATA, buf, len >> 2); - - /* cleanup any fractional read */ - if (len & 3) { - buf += len & ~3; - - for (; len & 3; len--) - *buf++ = readb(host->base + NFDATA); - } -} - -/** - * Write one block of data to the NAND port - * @param[in] mtd Instance data - * @param[out] buf buffer to read data from - * @param[in] len byte count - * - * This is a special block write variant for the S3C2440 CPU. - */ -static void s3c2440_nand_write_buf(struct nand_chip *chip, const uint8_t *buf, - int len) -{ - struct s3c24x0_nand_host *host = chip->priv; - - writesl(host->base + NFDATA, buf, len >> 2); - - /* cleanup any fractional write */ - if (len & 3) { - buf += len & ~3; - - for (; len & 3; len--, buf++) - writeb(*buf, host->base + NFDATA); - } -} -#endif - -/** - * Check the ECC and try to repair the data if possible - * @param[in] mtd_info Not used - * @param[inout] dat Pointer to the data buffer that might contain a bit error - * @param[in] read_ecc ECC data from the OOB space - * @param[in] calc_ecc ECC data calculated from the data - * @return 0 no error, 1 repaired error, -1 no way... - * - * @note: This routine works always on a 24 bit ECC - */ -static int s3c2410_nand_correct_data(struct nand_chip *chip, uint8_t *dat, - uint8_t *read_ecc, uint8_t *calc_ecc) -{ - unsigned int diff0, diff1, diff2; - unsigned int bit, byte; - - diff0 = read_ecc[0] ^ calc_ecc[0]; - diff1 = read_ecc[1] ^ calc_ecc[1]; - diff2 = read_ecc[2] ^ calc_ecc[2]; - - if (diff0 == 0 && diff1 == 0 && diff2 == 0) - return 0; /* ECC is ok */ - - /* sometimes people do not think about using the ECC, so check - * to see if we have an 0xff,0xff,0xff read ECC and then ignore - * the error, on the assumption that this is an un-eccd page. - */ - if (read_ecc[0] == 0xff && read_ecc[1] == 0xff && read_ecc[2] == 0xff) - return 0; - - /* Can we correct this ECC (ie, one row and column change). - * Note, this is similar to the 256 error code on smartmedia */ - - if (((diff0 ^ (diff0 >> 1)) & 0x55) == 0x55 && - ((diff1 ^ (diff1 >> 1)) & 0x55) == 0x55 && - ((diff2 ^ (diff2 >> 1)) & 0x55) == 0x55) { - /* calculate the bit position of the error */ - - bit = ((diff2 >> 3) & 1) | - ((diff2 >> 4) & 2) | - ((diff2 >> 5) & 4); - - /* calculate the byte position of the error */ - - byte = ((diff2 << 7) & 0x100) | - ((diff1 << 0) & 0x80) | - ((diff1 << 1) & 0x40) | - ((diff1 << 2) & 0x20) | - ((diff1 << 3) & 0x10) | - ((diff0 >> 4) & 0x08) | - ((diff0 >> 3) & 0x04) | - ((diff0 >> 2) & 0x02) | - ((diff0 >> 1) & 0x01); - - dat[byte] ^= (1 << bit); - return 1; - } - - /* if there is only one bit difference in the ECC, then - * one of only a row or column parity has changed, which - * means the error is most probably in the ECC itself */ - - diff0 |= (diff1 << 8); - diff0 |= (diff2 << 16); - - if ((diff0 & ~(1<<fls(diff0))) == 0) - return 1; - - return -1; -} - -static void s3c2410_nand_enable_hwecc(struct nand_chip *chip, int mode) -{ - struct s3c24x0_nand_host *host = chip->priv; - -#ifdef CONFIG_CPU_S3C2410 - writel(readl(host->base + NFCONF) | NFCONF_INITECC , host->base + NFCONF); -#endif -#ifdef CONFIG_CPU_S3C2440 - writel(readl(host->base + NFCONT) | NFCONT_INITECC , host->base + NFCONT); -#endif -} - -static int s3c2410_nand_calculate_ecc(struct nand_chip *chip, const uint8_t *dat, uint8_t *ecc_code) -{ - struct s3c24x0_nand_host *host = chip->priv; - -#ifdef CONFIG_CPU_S3C2410 - ecc_code[0] = readb(host->base + NFECC); - ecc_code[1] = readb(host->base + NFECC + 1); - ecc_code[2] = readb(host->base + NFECC + 2); -#endif -#ifdef CONFIG_CPU_S3C2440 - unsigned long ecc = readl(host->base + NFECC); - - ecc_code[0] = ecc; - ecc_code[1] = ecc >> 8; - ecc_code[2] = ecc >> 16; -#endif - return 0; -} - -static void s3c24x0_nand_select_chip(struct nand_chip *chip, int num) -{ - struct s3c24x0_nand_host *host = chip->priv; - - if (num == -1) - disable_cs(host->base); - else - enable_cs(host->base); -} - -static int s3c24x0_nand_devready(struct nand_chip *chip) -{ - struct s3c24x0_nand_host *host = chip->priv; - - return readw(host->base + NFSTAT) & NFSTAT_BUSY; -} - -static void s3c24x0_nand_hwcontrol(struct nand_chip *chip, int cmd, - unsigned int ctrl) -{ - struct s3c24x0_nand_host *host = chip->priv; - - if (cmd == NAND_CMD_NONE) - return; - /* - * If the CLE should be active, this call is a NAND command - */ - if (ctrl & NAND_CLE) - send_cmd(host->base, cmd); - /* - * If the ALE should be active, this call is a NAND address - */ - if (ctrl & NAND_ALE) - send_addr(host->base, cmd); -} - -static int s3c24x0_nand_inithw(struct s3c24x0_nand_host *host) -{ - struct s3c24x0_nand_platform_data *pdata = host->dev->platform_data; - uint32_t tmp; - - /* reset the NAND controller */ - disable_nand_controller(host->base); - - if (pdata != NULL) - tmp = pdata->nand_timing; - else - /* else slowest possible timing */ - tmp = CALC_NFCONF_TIMING(4, 8, 8); - - /* reenable the NAND controller */ - enable_nand_controller(host->base, tmp); - - return 0; -} - -static int s3c24x0_nand_probe(struct device_d *dev) -{ - struct resource *iores; - struct nand_chip *chip; - struct s3c24x0_nand_platform_data *pdata = dev->platform_data; - struct mtd_info *mtd; - struct s3c24x0_nand_host *host; - int ret; - - /* Allocate memory for MTD device structure and private data */ - host = kzalloc(sizeof(struct s3c24x0_nand_host), GFP_KERNEL); - if (!host) - return -ENOMEM; - - host->dev = dev; - iores = dev_request_mem_resource(dev, 0); - if (IS_ERR(iores)) - return PTR_ERR(iores); - host->base = IOMEM(iores->start); - - /* structures must be linked */ - chip = &host->nand; - mtd = nand_to_mtd(chip); - mtd->dev.parent = dev; - - /* init the default settings */ - - /* 50 us command delay time */ - chip->legacy.chip_delay = 50; - chip->priv = host; - - chip->legacy.IO_ADDR_R = chip->legacy.IO_ADDR_W = host->base + NFDATA; - -#ifdef CONFIG_CPU_S3C2440 - chip->legacy.read_buf = s3c2440_nand_read_buf; - chip->legacy.write_buf = s3c2440_nand_write_buf; -#endif - chip->legacy.cmd_ctrl = s3c24x0_nand_hwcontrol; - chip->legacy.dev_ready = s3c24x0_nand_devready; - chip->legacy.select_chip = s3c24x0_nand_select_chip; - - /* we are using the hardware ECC feature of this device */ - chip->ecc.calculate = s3c2410_nand_calculate_ecc; - chip->ecc.correct = s3c2410_nand_correct_data; - chip->ecc.hwctl = s3c2410_nand_enable_hwecc; - - /* - * Setup ECC handling in accordance to the kernel - * - 1 times 512 bytes with 24 bit ECC for small page - * - 8 times 256 bytes with 24 bit ECC each for large page - */ - chip->ecc.mode = NAND_ECC_HW; - chip->ecc.bytes = 3; /* always 24 bit ECC per turn */ - chip->ecc.strength = 1; - -#ifdef CONFIG_CPU_S3C2440 - if (readl(host->base) & 0x8) { - /* large page (2048 bytes per page) */ - chip->ecc.size = 256; - } else -#endif - { - /* small page (512 bytes per page) */ - chip->ecc.size = 512; - mtd_set_ecclayout(mtd, &nand_hw_eccoob); - } - - if (pdata->flash_bbt) { - /* use a flash based bbt */ - chip->bbt_options |= NAND_BBT_USE_FLASH; - } - - ret = s3c24x0_nand_inithw(host); - if (ret != 0) - goto on_error; - - /* Scan to find existence of the device */ - ret = nand_scan(chip, 1); - if (ret != 0) { - ret = -ENXIO; - goto on_error; - } - - return add_mtd_nand_device(mtd, "nand"); - -on_error: - free(host); - return ret; -} - -static struct driver_d s3c24x0_nand_driver = { - .name = "s3c24x0_nand", - .probe = s3c24x0_nand_probe, -}; -device_platform_driver(s3c24x0_nand_driver); - -#ifdef CONFIG_S3C_NAND_BOOT - -static void __nand_boot_init wait_for_completion(void __iomem *host) -{ - while (!(readw(host + NFSTAT) & NFSTAT_BUSY)) - ; -} - -/** - * Convert a page offset into a page address for the NAND - * @param host Where to write the address to - * @param offs Page's offset in the NAND - * @param ps Page size (512 or 2048) - * @param c Address cycle count (3, 4 or 5) - * - * Uses the offset of the page to generate an page address into the NAND. This - * differs when using a 512 byte or 2048 bytes per page NAND. - * The column part of the page address to be generated is always forced to '0'. - */ -static void __nand_boot_init nfc_addr(void __iomem *host, uint32_t offs, - int ps, int c) -{ - send_addr(host, 0); /* column part 1 */ - - if (ps == 512) { - send_addr(host, offs >> 9); - send_addr(host, offs >> 17); - if (c > 3) - send_addr(host, offs >> 25); - } else { - send_addr(host, 0); /* column part 2 */ - send_addr(host, offs >> 11); - send_addr(host, offs >> 19); - if (c > 4) - send_addr(host, offs >> 27); - send_cmd(host, NAND_CMD_READSTART); - } -} - -/** - * Load a sequential count of pages from the NAND into memory - * @param[out] dest Pointer to target area (in SDRAM) - * @param[in] size Bytes to read from NAND device - * @param[in] page Start page to read from - * - * This function must be located in the first 4kiB of the barebox image - * (guess why). - */ -void __nand_boot_init s3c24x0_nand_load_image(void *dest, int size, int page) -{ - void __iomem *host = (void __iomem *)S3C24X0_NAND_BASE; - unsigned pagesize; - int i, cycle; - - /* - * Reenable the NFC and use the default (but slow) access - * timing or the board specific setting if provided. - */ - enable_nand_controller(host, BOARD_DEFAULT_NAND_TIMING); - - /* use the current NAND hardware configuration */ - switch (readl(S3C24X0_NAND_BASE) & 0xf) { - case 0x6: /* 8 bit, 4 addr cycles, 512 bpp, normal NAND */ - pagesize = 512; - cycle = 4; - break; - case 0xc: /* 8 bit, 4 addr cycles, 2048 bpp, advanced NAND */ - pagesize = 2048; - cycle = 4; - break; - case 0xe: /* 8 bit, 5 addr cycles, 2048 bpp, advanced NAND */ - pagesize = 2048; - cycle = 5; - break; - default: - /* we cannot output an error message here :-( */ - disable_nand_controller(host); - return; - } - - enable_cs(host); - - /* Reset the NAND device */ - send_cmd(host, NAND_CMD_RESET); - wait_for_completion(host); - disable_cs(host); - - do { - enable_cs(host); - send_cmd(host, NAND_CMD_READ0); - nfc_addr(host, page * pagesize, pagesize, cycle); - wait_for_completion(host); - /* copy one page (do *not* use readsb() here!)*/ - for (i = 0; i < pagesize; i++) - writeb(readb(host + NFDATA), (void __iomem *)(dest + i)); - disable_cs(host); - - page++; - dest += pagesize; - size -= pagesize; - } while (size >= 0); - - /* disable the controller again */ - disable_nand_controller(host); -} - -#include <asm/sections.h> - -void __nand_boot_init nand_boot(void) -{ - void *dest = _text; - int size = barebox_image_size; - int page = 0; - - s3c24x0_nand_load_image(dest, size, page); -} -#ifdef CONFIG_NAND_S3C_BOOT_DEBUG -#include <command.h> - -static int do_nand_boot_test(int argc, char *argv[]) -{ - void *dest; - int size; - - if (argc < 3) - return COMMAND_ERROR_USAGE; - - dest = (void *)strtoul_suffix(argv[1], NULL, 0); - size = strtoul_suffix(argv[2], NULL, 0); - - s3c24x0_nand_load_image(dest, size, 0); - - /* re-enable the controller again, as this was a test only */ - enable_nand_controller((void *)S3C24X0_NAND_BASE, - BOARD_DEFAULT_NAND_TIMING); - - return 0; -} - -BAREBOX_CMD_START(nand_boot_test) - .cmd = do_nand_boot_test, - BAREBOX_CMD_DESC("load an image from NAND") - BAREBOX_CMD_OPTS("DEST SIZE") - BAREBOX_CMD_GROUP(CMD_GRP_BOOT) -BAREBOX_CMD_END -#endif - -#endif /* CONFIG_S3C_NAND_BOOT */ - -/** - * @file - * @brief Support for various kinds of NAND devices - * - * ECC handling in this driver (in accordance to the current 2.6.38 kernel): - * - for small page NANDs it generates 3 ECC bytes out of 512 data bytes - * - for large page NANDs it generates 24 ECC bytes out of 2048 data bytes - * - * As small page NANDs are using 48 bits ECC per default, this driver uses a - * local OOB layout description, to shrink it down to 24 bits. This is a bad - * idea, but we cannot change it here, as the kernel is using this layout. - * - * For large page NANDs this driver uses the default layout, as the kernel does. - */ |