[MTD] NAND: AT91 NAND driver
This version only differs from version posted by Savin Zlobec (20 Jun 2006) in that the AT91RM9200-specific chip-select / bus setup code has been moved from the at91_nand.c driver into the processor-specific file. From: Savin Zlobec <savin@epico.si> Signed-off-by: Andrew Victor <andrew@sanpeople.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
Andrew Victor
David Woodhouse
parent
c7cf0c68ea
commit
42cb1403af
3 changed files with 228 additions and 0 deletions
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@ -232,6 +232,13 @@ config MTD_NAND_CS553X
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If you say "m", the module will be called "cs553x_nand.ko".
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config MTD_NAND_AT91
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bool "Support for NAND Flash / SmartMedia on AT91"
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depends on MTD_NAND && ARCH_AT91
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help
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Enables support for NAND Flash / Smart Media Card interface
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on Atmel AT91 processors.
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config MTD_NAND_NANDSIM
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tristate "Support for NAND Flash Simulator"
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depends on MTD_NAND && MTD_PARTITIONS
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@ -22,5 +22,6 @@ obj-$(CONFIG_MTD_NAND_TS7250) += ts7250.o
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obj-$(CONFIG_MTD_NAND_NANDSIM) += nandsim.o
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obj-$(CONFIG_MTD_NAND_CS553X) += cs553x_nand.o
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obj-$(CONFIG_MTD_NAND_NDFC) += ndfc.o
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obj-$(CONFIG_MTD_NAND_AT91) += at91_nand.o
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nand-objs = nand_base.o nand_bbt.o
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220
drivers/mtd/nand/at91_nand.c
Normal file
220
drivers/mtd/nand/at91_nand.c
Normal file
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@ -0,0 +1,220 @@
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/*
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* drivers/mtd/nand/at91_nand.c
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*
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* Copyright (C) 2003 Rick Bronson
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*
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* Derived from drivers/mtd/nand/autcpu12.c
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* Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
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*
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* Derived from drivers/mtd/spia.c
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* Copyright (C) 2000 Steven J. Hill (sjhill@cotw.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/nand.h>
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#include <linux/mtd/partitions.h>
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#include <asm/io.h>
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#include <asm/sizes.h>
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#include <asm/hardware.h>
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#include <asm/arch/board.h>
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#include <asm/arch/gpio.h>
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struct at91_nand_host {
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struct nand_chip nand_chip;
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struct mtd_info mtd;
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void __iomem *io_base;
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struct at91_nand_data *board;
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};
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/*
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* Hardware specific access to control-lines
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*/
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static void at91_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
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{
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struct nand_chip *nand_chip = mtd->priv;
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struct at91_nand_host *host = nand_chip->priv;
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if (cmd == NAND_CMD_NONE)
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return;
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if (ctrl & NAND_CLE)
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writeb(cmd, host->io_base + (1 << host->board->cle));
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else
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writeb(cmd, host->io_base + (1 << host->board->ale));
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}
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/*
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* Read the Device Ready pin.
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*/
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static int at91_nand_device_ready(struct mtd_info *mtd)
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{
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struct nand_chip *nand_chip = mtd->priv;
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struct at91_nand_host *host = nand_chip->priv;
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return at91_get_gpio_value(host->board->rdy_pin);
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}
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/*
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* Enable NAND.
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*/
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static void at91_nand_enable(struct at91_nand_host *host)
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{
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if (host->board->enable_pin)
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at91_set_gpio_value(host->board->enable_pin, 0);
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}
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/*
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* Disable NAND.
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*/
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static void at91_nand_disable(struct at91_nand_host *host)
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{
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if (host->board->enable_pin)
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at91_set_gpio_value(host->board->enable_pin, 1);
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}
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/*
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* Probe for the NAND device.
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*/
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static int __init at91_nand_probe(struct platform_device *pdev)
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{
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struct at91_nand_host *host;
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struct mtd_info *mtd;
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struct nand_chip *nand_chip;
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int res;
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#ifdef CONFIG_MTD_PARTITIONS
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struct mtd_partition *partitions = NULL;
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int num_partitions = 0;
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#endif
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/* Allocate memory for the device structure (and zero it) */
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host = kzalloc(sizeof(struct at91_nand_host), GFP_KERNEL);
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if (!host) {
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printk(KERN_ERR "at91_nand: failed to allocate device structure.\n");
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return -ENOMEM;
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}
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host->io_base = ioremap(pdev->resource[0].start,
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pdev->resource[0].end - pdev->resource[0].start + 1);
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if (host->io_base == NULL) {
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printk(KERN_ERR "at91_nand: ioremap failed\n");
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kfree(host);
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return -EIO;
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}
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mtd = &host->mtd;
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nand_chip = &host->nand_chip;
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host->board = pdev->dev.platform_data;
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nand_chip->priv = host; /* link the private data structures */
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mtd->priv = nand_chip;
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mtd->owner = THIS_MODULE;
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/* Set address of NAND IO lines */
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nand_chip->IO_ADDR_R = host->io_base;
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nand_chip->IO_ADDR_W = host->io_base;
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nand_chip->cmd_ctrl = at91_nand_cmd_ctrl;
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nand_chip->dev_ready = at91_nand_device_ready;
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nand_chip->ecc.mode = NAND_ECC_SOFT; /* enable ECC */
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nand_chip->chip_delay = 20; /* 20us command delay time */
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platform_set_drvdata(pdev, host);
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at91_nand_enable(host);
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if (host->board->det_pin) {
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if (at91_get_gpio_value(host->board->det_pin)) {
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printk ("No SmartMedia card inserted.\n");
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res = ENXIO;
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goto out;
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}
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}
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/* Scan to find existance of the device */
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if (nand_scan(mtd, 1)) {
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res = -ENXIO;
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goto out;
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}
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#ifdef CONFIG_MTD_PARTITIONS
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if (host->board->partition_info)
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partitions = host->board->partition_info(mtd->size, &num_partitions);
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if ((!partitions) || (num_partitions == 0)) {
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printk(KERN_ERR "at91_nand: No parititions defined, or unsupported device.\n");
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res = ENXIO;
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goto release;
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}
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res = add_mtd_partitions(mtd, partitions, num_partitions);
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#else
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res = add_mtd_device(mtd);
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#endif
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if (!res)
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return res;
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release:
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nand_release(mtd);
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out:
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at91_nand_disable(host);
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platform_set_drvdata(pdev, NULL);
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iounmap(host->io_base);
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kfree(host);
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return res;
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}
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/*
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* Remove a NAND device.
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*/
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static int __devexit at91_nand_remove(struct platform_device *pdev)
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{
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struct at91_nand_host *host = platform_get_drvdata(pdev);
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struct mtd_info *mtd = &host->mtd;
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nand_release(mtd);
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at91_nand_disable(host);
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iounmap(host->io_base);
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kfree(host);
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return 0;
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}
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static struct platform_driver at91_nand_driver = {
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.probe = at91_nand_probe,
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.remove = at91_nand_remove,
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.driver = {
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.name = "at91_nand",
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.owner = THIS_MODULE,
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},
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};
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static int __init at91_nand_init(void)
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{
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return platform_driver_register(&at91_nand_driver);
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}
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static void __exit at91_nand_exit(void)
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{
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platform_driver_unregister(&at91_nand_driver);
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}
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module_init(at91_nand_init);
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module_exit(at91_nand_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Rick Bronson");
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MODULE_DESCRIPTION("NAND/SmartMedia driver for AT91RM9200");
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