257 строки
6.3 KiB
C
257 строки
6.3 KiB
C
/*
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* drivers/mtd/nand/sharpsl.c
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*
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* Copyright (C) 2004 Richard Purdie
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* Copyright (C) 2008 Dmitry Baryshkov
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*
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* Based on Sharp's NAND driver sharp_sl.c
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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/genhd.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/delay.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/nand_ecc.h>
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#include <linux/mtd/partitions.h>
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#include <linux/mtd/sharpsl.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <asm/io.h>
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#include <mach/hardware.h>
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#include <asm/mach-types.h>
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struct sharpsl_nand {
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struct mtd_info mtd;
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struct nand_chip chip;
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void __iomem *io;
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};
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#define mtd_to_sharpsl(_mtd) container_of(_mtd, struct sharpsl_nand, mtd)
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/* register offset */
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#define ECCLPLB 0x00 /* line parity 7 - 0 bit */
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#define ECCLPUB 0x04 /* line parity 15 - 8 bit */
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#define ECCCP 0x08 /* column parity 5 - 0 bit */
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#define ECCCNTR 0x0C /* ECC byte counter */
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#define ECCCLRR 0x10 /* cleare ECC */
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#define FLASHIO 0x14 /* Flash I/O */
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#define FLASHCTL 0x18 /* Flash Control */
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/* Flash control bit */
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#define FLRYBY (1 << 5)
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#define FLCE1 (1 << 4)
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#define FLWP (1 << 3)
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#define FLALE (1 << 2)
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#define FLCLE (1 << 1)
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#define FLCE0 (1 << 0)
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/*
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* hardware specific access to control-lines
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* ctrl:
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* NAND_CNE: bit 0 -> ! bit 0 & 4
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* NAND_CLE: bit 1 -> bit 1
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* NAND_ALE: bit 2 -> bit 2
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*
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*/
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static void sharpsl_nand_hwcontrol(struct mtd_info *mtd, int cmd,
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unsigned int ctrl)
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{
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struct sharpsl_nand *sharpsl = mtd_to_sharpsl(mtd);
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struct nand_chip *chip = mtd->priv;
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if (ctrl & NAND_CTRL_CHANGE) {
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unsigned char bits = ctrl & 0x07;
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bits |= (ctrl & 0x01) << 4;
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bits ^= 0x11;
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writeb((readb(sharpsl->io + FLASHCTL) & ~0x17) | bits, sharpsl->io + FLASHCTL);
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}
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if (cmd != NAND_CMD_NONE)
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writeb(cmd, chip->IO_ADDR_W);
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}
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static int sharpsl_nand_dev_ready(struct mtd_info *mtd)
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{
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struct sharpsl_nand *sharpsl = mtd_to_sharpsl(mtd);
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return !((readb(sharpsl->io + FLASHCTL) & FLRYBY) == 0);
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}
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static void sharpsl_nand_enable_hwecc(struct mtd_info *mtd, int mode)
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{
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struct sharpsl_nand *sharpsl = mtd_to_sharpsl(mtd);
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writeb(0, sharpsl->io + ECCCLRR);
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}
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static int sharpsl_nand_calculate_ecc(struct mtd_info *mtd, const u_char * dat, u_char * ecc_code)
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{
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struct sharpsl_nand *sharpsl = mtd_to_sharpsl(mtd);
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ecc_code[0] = ~readb(sharpsl->io + ECCLPUB);
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ecc_code[1] = ~readb(sharpsl->io + ECCLPLB);
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ecc_code[2] = (~readb(sharpsl->io + ECCCP) << 2) | 0x03;
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return readb(sharpsl->io + ECCCNTR) != 0;
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}
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static const char *part_probes[] = { "cmdlinepart", NULL };
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/*
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* Main initialization routine
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*/
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static int __devinit sharpsl_nand_probe(struct platform_device *pdev)
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{
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struct nand_chip *this;
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struct mtd_partition *sharpsl_partition_info;
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int nr_partitions;
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struct resource *r;
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int err = 0;
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struct sharpsl_nand *sharpsl;
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struct sharpsl_nand_platform_data *data = pdev->dev.platform_data;
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if (!data) {
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dev_err(&pdev->dev, "no platform data!\n");
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return -EINVAL;
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}
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/* Allocate memory for MTD device structure and private data */
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sharpsl = kzalloc(sizeof(struct sharpsl_nand), GFP_KERNEL);
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if (!sharpsl) {
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printk("Unable to allocate SharpSL NAND MTD device structure.\n");
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return -ENOMEM;
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}
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!r) {
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dev_err(&pdev->dev, "no io memory resource defined!\n");
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err = -ENODEV;
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goto err_get_res;
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}
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/* map physical address */
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sharpsl->io = ioremap(r->start, resource_size(r));
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if (!sharpsl->io) {
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printk("ioremap to access Sharp SL NAND chip failed\n");
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err = -EIO;
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goto err_ioremap;
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}
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/* Get pointer to private data */
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this = (struct nand_chip *)(&sharpsl->chip);
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/* Link the private data with the MTD structure */
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sharpsl->mtd.priv = this;
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sharpsl->mtd.owner = THIS_MODULE;
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platform_set_drvdata(pdev, sharpsl);
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/*
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* PXA initialize
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*/
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writeb(readb(sharpsl->io + FLASHCTL) | FLWP, sharpsl->io + FLASHCTL);
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/* Set address of NAND IO lines */
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this->IO_ADDR_R = sharpsl->io + FLASHIO;
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this->IO_ADDR_W = sharpsl->io + FLASHIO;
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/* Set address of hardware control function */
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this->cmd_ctrl = sharpsl_nand_hwcontrol;
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this->dev_ready = sharpsl_nand_dev_ready;
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/* 15 us command delay time */
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this->chip_delay = 15;
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/* set eccmode using hardware ECC */
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this->ecc.mode = NAND_ECC_HW;
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this->ecc.size = 256;
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this->ecc.bytes = 3;
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this->badblock_pattern = data->badblock_pattern;
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this->ecc.layout = data->ecc_layout;
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this->ecc.hwctl = sharpsl_nand_enable_hwecc;
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this->ecc.calculate = sharpsl_nand_calculate_ecc;
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this->ecc.correct = nand_correct_data;
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/* Scan to find existence of the device */
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err = nand_scan(&sharpsl->mtd, 1);
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if (err)
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goto err_scan;
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/* Register the partitions */
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sharpsl->mtd.name = "sharpsl-nand";
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nr_partitions = parse_mtd_partitions(&sharpsl->mtd, part_probes, &sharpsl_partition_info, 0);
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if (nr_partitions <= 0) {
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nr_partitions = data->nr_partitions;
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sharpsl_partition_info = data->partitions;
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}
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err = mtd_device_register(&sharpsl->mtd, sharpsl_partition_info,
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nr_partitions);
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if (err)
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goto err_add;
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/* Return happy */
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return 0;
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err_add:
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nand_release(&sharpsl->mtd);
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err_scan:
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platform_set_drvdata(pdev, NULL);
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iounmap(sharpsl->io);
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err_ioremap:
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err_get_res:
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kfree(sharpsl);
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return err;
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}
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/*
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* Clean up routine
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*/
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static int __devexit sharpsl_nand_remove(struct platform_device *pdev)
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{
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struct sharpsl_nand *sharpsl = platform_get_drvdata(pdev);
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/* Release resources, unregister device */
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nand_release(&sharpsl->mtd);
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platform_set_drvdata(pdev, NULL);
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iounmap(sharpsl->io);
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/* Free the MTD device structure */
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kfree(sharpsl);
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return 0;
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}
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static struct platform_driver sharpsl_nand_driver = {
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.driver = {
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.name = "sharpsl-nand",
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.owner = THIS_MODULE,
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},
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.probe = sharpsl_nand_probe,
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.remove = __devexit_p(sharpsl_nand_remove),
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};
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static int __init sharpsl_nand_init(void)
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{
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return platform_driver_register(&sharpsl_nand_driver);
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}
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module_init(sharpsl_nand_init);
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static void __exit sharpsl_nand_exit(void)
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{
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platform_driver_unregister(&sharpsl_nand_driver);
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}
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module_exit(sharpsl_nand_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
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MODULE_DESCRIPTION("Device specific logic for NAND flash on Sharp SL-C7xx Series");
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