diff options
Diffstat (limited to 'drivers/mtd/nand/at91_nand.c')
| -rw-r--r-- | drivers/mtd/nand/at91_nand.c | 594 |
1 files changed, 0 insertions, 594 deletions
diff --git a/drivers/mtd/nand/at91_nand.c b/drivers/mtd/nand/at91_nand.c deleted file mode 100644 index 0adb287027a2..000000000000 --- a/drivers/mtd/nand/at91_nand.c +++ /dev/null @@ -1,594 +0,0 @@ -/* - * drivers/mtd/nand/at91_nand.c - * - * Copyright (C) 2003 Rick Bronson - * - * Derived from drivers/mtd/nand/autcpu12.c - * Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de) - * - * Derived from drivers/mtd/spia.c - * Copyright (C) 2000 Steven J. Hill (sjhill@cotw.com) - * - * - * Add Hardware ECC support for AT91SAM9260 / AT91SAM9263 - * Richard Genoud (richard.genoud@gmail.com), Adeneo Copyright (C) 2007 - * - * Derived from Das U-Boot source code - * (u-boot-1.1.5/board/atmel/at91sam9263ek/nand.c) - * (C) Copyright 2006 ATMEL Rousset, Lacressonniere Nicolas - * - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - */ - -#include <linux/slab.h> -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/mtd/mtd.h> -#include <linux/mtd/nand.h> -#include <linux/mtd/partitions.h> - -#include <asm/io.h> -#include <asm/sizes.h> - -#include <asm/hardware.h> -#include <asm/arch/board.h> -#include <asm/arch/gpio.h> - -#ifdef CONFIG_MTD_NAND_AT91_ECC_HW -#define hard_ecc 1 -#else -#define hard_ecc 0 -#endif - -#ifdef CONFIG_MTD_NAND_AT91_ECC_NONE -#define no_ecc 1 -#else -#define no_ecc 0 -#endif - -/* Register access macros */ -#define ecc_readl(add, reg) \ - __raw_readl(add + AT91_ECC_##reg) -#define ecc_writel(add, reg, value) \ - __raw_writel((value), add + AT91_ECC_##reg) - -#include <asm/arch/at91_ecc.h> /* AT91SAM9260/3 ECC registers */ - -/* oob layout for large page size - * bad block info is on bytes 0 and 1 - * the bytes have to be consecutives to avoid - * several NAND_CMD_RNDOUT during read - */ -static struct nand_ecclayout at91_oobinfo_large = { - .eccbytes = 4, - .eccpos = {60, 61, 62, 63}, - .oobfree = { - {2, 58} - }, -}; - -/* oob layout for small page size - * bad block info is on bytes 4 and 5 - * the bytes have to be consecutives to avoid - * several NAND_CMD_RNDOUT during read - */ -static struct nand_ecclayout at91_oobinfo_small = { - .eccbytes = 4, - .eccpos = {0, 1, 2, 3}, - .oobfree = { - {6, 10} - }, -}; - -struct at91_nand_host { - struct nand_chip nand_chip; - struct mtd_info mtd; - void __iomem *io_base; - struct at91_nand_data *board; - struct device *dev; - void __iomem *ecc; -}; - -/* - * Enable NAND. - */ -static void at91_nand_enable(struct at91_nand_host *host) -{ - if (host->board->enable_pin) - at91_set_gpio_value(host->board->enable_pin, 0); -} - -/* - * Disable NAND. - */ -static void at91_nand_disable(struct at91_nand_host *host) -{ - if (host->board->enable_pin) - at91_set_gpio_value(host->board->enable_pin, 1); -} - -/* - * Hardware specific access to control-lines - */ -static void at91_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) -{ - struct nand_chip *nand_chip = mtd->priv; - struct at91_nand_host *host = nand_chip->priv; - - if (ctrl & NAND_CTRL_CHANGE) { - if (ctrl & NAND_NCE) - at91_nand_enable(host); - else - at91_nand_disable(host); - } - if (cmd == NAND_CMD_NONE) - return; - - if (ctrl & NAND_CLE) - writeb(cmd, host->io_base + (1 << host->board->cle)); - else - writeb(cmd, host->io_base + (1 << host->board->ale)); -} - -/* - * Read the Device Ready pin. - */ -static int at91_nand_device_ready(struct mtd_info *mtd) -{ - struct nand_chip *nand_chip = mtd->priv; - struct at91_nand_host *host = nand_chip->priv; - - return at91_get_gpio_value(host->board->rdy_pin); -} - -/* - * write oob for small pages - */ -static int at91_nand_write_oob_512(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 len, pos, status = 0; - const uint8_t *bufpoi = chip->oob_poi; - - pos = eccsize + chunk; - - chip->cmdfunc(mtd, NAND_CMD_SEQIN, pos, page); - 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; - -} - -/* - * read oob for small pages - */ -static int at91_nand_read_oob_512(struct mtd_info *mtd, - struct nand_chip *chip, int page, int sndcmd) -{ - if (sndcmd) { - chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page); - sndcmd = 0; - } - chip->read_buf(mtd, chip->oob_poi, mtd->oobsize); - return sndcmd; -} - -/* - * Calculate HW ECC - * - * function called after a write - * - * mtd: MTD block structure - * dat: raw data (unused) - * ecc_code: buffer for ECC - */ -static int at91_nand_calculate(struct mtd_info *mtd, - const u_char *dat, unsigned char *ecc_code) -{ - struct nand_chip *nand_chip = mtd->priv; - struct at91_nand_host *host = nand_chip->priv; - uint32_t *eccpos = nand_chip->ecc.layout->eccpos; - unsigned int ecc_value; - - /* get the first 2 ECC bytes */ - ecc_value = ecc_readl(host->ecc, PR); - - ecc_code[eccpos[0]] = ecc_value & 0xFF; - ecc_code[eccpos[1]] = (ecc_value >> 8) & 0xFF; - - /* get the last 2 ECC bytes */ - ecc_value = ecc_readl(host->ecc, NPR) & AT91_ECC_NPARITY; - - ecc_code[eccpos[2]] = ecc_value & 0xFF; - ecc_code[eccpos[3]] = (ecc_value >> 8) & 0xFF; - - return 0; -} - -/* - * HW ECC read page function - * - * mtd: mtd info structure - * chip: nand chip info structure - * buf: buffer to store read data - */ -static int at91_nand_read_page(struct mtd_info *mtd, - struct nand_chip *chip, uint8_t *buf) -{ - int eccsize = chip->ecc.size; - int eccbytes = chip->ecc.bytes; - uint32_t *eccpos = chip->ecc.layout->eccpos; - uint8_t *p = buf; - uint8_t *oob = chip->oob_poi; - uint8_t *ecc_pos; - int stat; - - /* read the page */ - chip->read_buf(mtd, p, eccsize); - - /* move to ECC position if needed */ - if (eccpos[0] != 0) { - /* This only works on large pages - * because the ECC controller waits for - * NAND_CMD_RNDOUTSTART after the - * NAND_CMD_RNDOUT. - * anyway, for small pages, the eccpos[0] == 0 - */ - chip->cmdfunc(mtd, NAND_CMD_RNDOUT, - mtd->writesize + eccpos[0], -1); - } - - /* the ECC controller needs to read the ECC just after the data */ - ecc_pos = oob + eccpos[0]; - chip->read_buf(mtd, ecc_pos, eccbytes); - - /* check if there's an error */ - stat = chip->ecc.correct(mtd, p, oob, NULL); - - if (stat < 0) - mtd->ecc_stats.failed++; - else - mtd->ecc_stats.corrected += stat; - - /* get back to oob start (end of page) */ - chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize, -1); - - /* read the oob */ - chip->read_buf(mtd, oob, mtd->oobsize); - - return 0; -} - -/* - * HW ECC Correction - * - * function called after a read - * - * mtd: MTD block structure - * dat: raw data read from the chip - * read_ecc: ECC from the chip (unused) - * isnull: unused - * - * Detect and correct a 1 bit error for a page - */ -static int at91_nand_correct(struct mtd_info *mtd, u_char *dat, - u_char *read_ecc, u_char *isnull) -{ - struct nand_chip *nand_chip = mtd->priv; - struct at91_nand_host *host = nand_chip->priv; - unsigned int ecc_status; - unsigned int ecc_word, ecc_bit; - - /* get the status from the Status Register */ - ecc_status = ecc_readl(host->ecc, SR); - - /* if there's no error */ - if (likely(!(ecc_status & AT91_ECC_RECERR))) - return 0; - - /* get error bit offset (4 bits) */ - ecc_bit = ecc_readl(host->ecc, PR) & AT91_ECC_BITADDR; - /* get word address (12 bits) */ - ecc_word = ecc_readl(host->ecc, PR) & AT91_ECC_WORDADDR; - ecc_word >>= 4; - - /* if there are multiple errors */ - if (ecc_status & AT91_ECC_MULERR) { - /* check if it is a freshly erased block - * (filled with 0xff) */ - if ((ecc_bit == AT91_ECC_BITADDR) - && (ecc_word == (AT91_ECC_WORDADDR >> 4))) { - /* the block has just been erased, return OK */ - return 0; - } - /* it doesn't seems to be a freshly - * erased block. - * We can't correct so many errors */ - dev_dbg(host->dev, "at91_nand : multiple errors detected." - " Unable to correct.\n"); - return -EIO; - } - - /* if there's a single bit error : we can correct it */ - if (ecc_status & AT91_ECC_ECCERR) { - /* there's nothing much to do here. - * the bit error is on the ECC itself. - */ - dev_dbg(host->dev, "at91_nand : one bit error on ECC code." - " Nothing to correct\n"); - return 0; - } - - dev_dbg(host->dev, "at91_nand : one bit error on data." - " (word offset in the page :" - " 0x%x bit offset : 0x%x)\n", - ecc_word, ecc_bit); - /* correct the error */ - if (nand_chip->options & NAND_BUSWIDTH_16) { - /* 16 bits words */ - ((unsigned short *) dat)[ecc_word] ^= (1 << ecc_bit); - } else { - /* 8 bits words */ - dat[ecc_word] ^= (1 << ecc_bit); - } - dev_dbg(host->dev, "at91_nand : error corrected\n"); - return 1; -} - -/* - * Enable HW ECC : unsused - */ -static void at91_nand_hwctl(struct mtd_info *mtd, int mode) { ; } - -#ifdef CONFIG_MTD_PARTITIONS -static const char *part_probes[] = { "cmdlinepart", NULL }; -#endif - -/* - * Probe for the NAND device. - */ -static int __init at91_nand_probe(struct platform_device *pdev) -{ - struct at91_nand_host *host; - struct mtd_info *mtd; - struct nand_chip *nand_chip; - struct resource *regs; - struct resource *mem; - int res; - -#ifdef CONFIG_MTD_PARTITIONS - struct mtd_partition *partitions = NULL; - int num_partitions = 0; -#endif - - /* Allocate memory for the device structure (and zero it) */ - host = kzalloc(sizeof(struct at91_nand_host), GFP_KERNEL); - if (!host) { - printk(KERN_ERR "at91_nand: failed to allocate device structure.\n"); - return -ENOMEM; - } - - mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!mem) { - printk(KERN_ERR "at91_nand: can't get I/O resource mem\n"); - return -ENXIO; - } - - host->io_base = ioremap(mem->start, mem->end - mem->start + 1); - if (host->io_base == NULL) { - printk(KERN_ERR "at91_nand: ioremap failed\n"); - kfree(host); - return -EIO; - } - - mtd = &host->mtd; - nand_chip = &host->nand_chip; - host->board = pdev->dev.platform_data; - host->dev = &pdev->dev; - - nand_chip->priv = host; /* link the private data structures */ - mtd->priv = nand_chip; - mtd->owner = THIS_MODULE; - - /* Set address of NAND IO lines */ - nand_chip->IO_ADDR_R = host->io_base; - nand_chip->IO_ADDR_W = host->io_base; - nand_chip->cmd_ctrl = at91_nand_cmd_ctrl; - - if (host->board->rdy_pin) - nand_chip->dev_ready = at91_nand_device_ready; - - regs = platform_get_resource(pdev, IORESOURCE_MEM, 1); - if (!regs && hard_ecc) { - printk(KERN_ERR "at91_nand: can't get I/O resource " - "regs\nFalling back on software ECC\n"); - } - - nand_chip->ecc.mode = NAND_ECC_SOFT; /* enable ECC */ - if (no_ecc) - nand_chip->ecc.mode = NAND_ECC_NONE; - if (hard_ecc && regs) { - host->ecc = ioremap(regs->start, regs->end - regs->start + 1); - if (host->ecc == NULL) { - printk(KERN_ERR "at91_nand: ioremap failed\n"); - res = -EIO; - goto err_ecc_ioremap; - } - nand_chip->ecc.mode = NAND_ECC_HW_SYNDROME; - nand_chip->ecc.calculate = at91_nand_calculate; - nand_chip->ecc.correct = at91_nand_correct; - nand_chip->ecc.hwctl = at91_nand_hwctl; - nand_chip->ecc.read_page = at91_nand_read_page; - nand_chip->ecc.bytes = 4; - nand_chip->ecc.prepad = 0; - nand_chip->ecc.postpad = 0; - } - - nand_chip->chip_delay = 20; /* 20us command delay time */ - - if (host->board->bus_width_16) /* 16-bit bus width */ - nand_chip->options |= NAND_BUSWIDTH_16; - - platform_set_drvdata(pdev, host); - at91_nand_enable(host); - - if (host->board->det_pin) { - if (at91_get_gpio_value(host->board->det_pin)) { - printk ("No SmartMedia card inserted.\n"); - res = ENXIO; - goto out; - } - } - - /* first scan to find the device and get the page size */ - if (nand_scan_ident(mtd, 1)) { - res = -ENXIO; - goto out; - } - - if (nand_chip->ecc.mode == NAND_ECC_HW_SYNDROME) { - /* ECC is calculated for the whole page (1 step) */ - nand_chip->ecc.size = mtd->writesize; - - /* set ECC page size and oob layout */ - switch (mtd->writesize) { - case 512: - nand_chip->ecc.layout = &at91_oobinfo_small; - nand_chip->ecc.read_oob = at91_nand_read_oob_512; - nand_chip->ecc.write_oob = at91_nand_write_oob_512; - ecc_writel(host->ecc, MR, AT91_ECC_PAGESIZE_528); - break; - case 1024: - nand_chip->ecc.layout = &at91_oobinfo_large; - ecc_writel(host->ecc, MR, AT91_ECC_PAGESIZE_1056); - break; - case 2048: - nand_chip->ecc.layout = &at91_oobinfo_large; - ecc_writel(host->ecc, MR, AT91_ECC_PAGESIZE_2112); - break; - case 4096: - nand_chip->ecc.layout = &at91_oobinfo_large; - ecc_writel(host->ecc, MR, AT91_ECC_PAGESIZE_4224); - break; - default: - /* page size not handled by HW ECC */ - /* switching back to soft ECC */ - nand_chip->ecc.mode = NAND_ECC_SOFT; - nand_chip->ecc.calculate = NULL; - nand_chip->ecc.correct = NULL; - nand_chip->ecc.hwctl = NULL; - nand_chip->ecc.read_page = NULL; - nand_chip->ecc.postpad = 0; - nand_chip->ecc.prepad = 0; - nand_chip->ecc.bytes = 0; - break; - } - } - - /* second phase scan */ - if (nand_scan_tail(mtd)) { - res = -ENXIO; - goto out; - } - -#ifdef CONFIG_MTD_PARTITIONS -#ifdef CONFIG_MTD_CMDLINE_PARTS - mtd->name = "at91_nand"; - num_partitions = parse_mtd_partitions(mtd, part_probes, - &partitions, 0); -#endif - if (num_partitions <= 0 && host->board->partition_info) - partitions = host->board->partition_info(mtd->size, - &num_partitions); - - if ((!partitions) || (num_partitions == 0)) { - printk(KERN_ERR "at91_nand: No parititions defined, or unsupported device.\n"); - res = ENXIO; - goto release; - } - - res = add_mtd_partitions(mtd, partitions, num_partitions); -#else - res = add_mtd_device(mtd); -#endif - - if (!res) - return res; - -#ifdef CONFIG_MTD_PARTITIONS -release: -#endif - nand_release(mtd); - -out: - iounmap(host->ecc); - -err_ecc_ioremap: - at91_nand_disable(host); - platform_set_drvdata(pdev, NULL); - iounmap(host->io_base); - kfree(host); - return res; -} - -/* - * Remove a NAND device. - */ -static int __devexit at91_nand_remove(struct platform_device *pdev) -{ - struct at91_nand_host *host = platform_get_drvdata(pdev); - struct mtd_info *mtd = &host->mtd; - - nand_release(mtd); - - at91_nand_disable(host); - - iounmap(host->io_base); - iounmap(host->ecc); - kfree(host); - - return 0; -} - -static struct platform_driver at91_nand_driver = { - .probe = at91_nand_probe, - .remove = at91_nand_remove, - .driver = { - .name = "at91_nand", - .owner = THIS_MODULE, - }, -}; - -static int __init at91_nand_init(void) -{ - return platform_driver_register(&at91_nand_driver); -} - - -static void __exit at91_nand_exit(void) -{ - platform_driver_unregister(&at91_nand_driver); -} - - -module_init(at91_nand_init); -module_exit(at91_nand_exit); - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Rick Bronson"); -MODULE_DESCRIPTION("NAND/SmartMedia driver for AT91RM9200 / AT91SAM9"); -MODULE_ALIAS("platform:at91_nand"); |