![Jingoo Han](/assets/img/avatar_default.png)
Use the wrapper function for retrieving the platform data instead of accessing dev->platform_data directly. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Brian Norris <computersforpeace@gmail.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
236 lines
5.7 KiB
C
236 lines
5.7 KiB
C
/*
|
|
* drivers/mtd/nand/sharpsl.c
|
|
*
|
|
* Copyright (C) 2004 Richard Purdie
|
|
* Copyright (C) 2008 Dmitry Baryshkov
|
|
*
|
|
* Based on Sharp's NAND driver sharp_sl.c
|
|
*
|
|
* 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/genhd.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/module.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/mtd/nand.h>
|
|
#include <linux/mtd/nand_ecc.h>
|
|
#include <linux/mtd/partitions.h>
|
|
#include <linux/mtd/sharpsl.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <mach/hardware.h>
|
|
#include <asm/mach-types.h>
|
|
|
|
struct sharpsl_nand {
|
|
struct mtd_info mtd;
|
|
struct nand_chip chip;
|
|
|
|
void __iomem *io;
|
|
};
|
|
|
|
#define mtd_to_sharpsl(_mtd) container_of(_mtd, struct sharpsl_nand, mtd)
|
|
|
|
/* register offset */
|
|
#define ECCLPLB 0x00 /* line parity 7 - 0 bit */
|
|
#define ECCLPUB 0x04 /* line parity 15 - 8 bit */
|
|
#define ECCCP 0x08 /* column parity 5 - 0 bit */
|
|
#define ECCCNTR 0x0C /* ECC byte counter */
|
|
#define ECCCLRR 0x10 /* cleare ECC */
|
|
#define FLASHIO 0x14 /* Flash I/O */
|
|
#define FLASHCTL 0x18 /* Flash Control */
|
|
|
|
/* Flash control bit */
|
|
#define FLRYBY (1 << 5)
|
|
#define FLCE1 (1 << 4)
|
|
#define FLWP (1 << 3)
|
|
#define FLALE (1 << 2)
|
|
#define FLCLE (1 << 1)
|
|
#define FLCE0 (1 << 0)
|
|
|
|
/*
|
|
* hardware specific access to control-lines
|
|
* ctrl:
|
|
* NAND_CNE: bit 0 -> ! bit 0 & 4
|
|
* NAND_CLE: bit 1 -> bit 1
|
|
* NAND_ALE: bit 2 -> bit 2
|
|
*
|
|
*/
|
|
static void sharpsl_nand_hwcontrol(struct mtd_info *mtd, int cmd,
|
|
unsigned int ctrl)
|
|
{
|
|
struct sharpsl_nand *sharpsl = mtd_to_sharpsl(mtd);
|
|
struct nand_chip *chip = mtd->priv;
|
|
|
|
if (ctrl & NAND_CTRL_CHANGE) {
|
|
unsigned char bits = ctrl & 0x07;
|
|
|
|
bits |= (ctrl & 0x01) << 4;
|
|
|
|
bits ^= 0x11;
|
|
|
|
writeb((readb(sharpsl->io + FLASHCTL) & ~0x17) | bits, sharpsl->io + FLASHCTL);
|
|
}
|
|
|
|
if (cmd != NAND_CMD_NONE)
|
|
writeb(cmd, chip->IO_ADDR_W);
|
|
}
|
|
|
|
static int sharpsl_nand_dev_ready(struct mtd_info *mtd)
|
|
{
|
|
struct sharpsl_nand *sharpsl = mtd_to_sharpsl(mtd);
|
|
return !((readb(sharpsl->io + FLASHCTL) & FLRYBY) == 0);
|
|
}
|
|
|
|
static void sharpsl_nand_enable_hwecc(struct mtd_info *mtd, int mode)
|
|
{
|
|
struct sharpsl_nand *sharpsl = mtd_to_sharpsl(mtd);
|
|
writeb(0, sharpsl->io + ECCCLRR);
|
|
}
|
|
|
|
static int sharpsl_nand_calculate_ecc(struct mtd_info *mtd, const u_char * dat, u_char * ecc_code)
|
|
{
|
|
struct sharpsl_nand *sharpsl = mtd_to_sharpsl(mtd);
|
|
ecc_code[0] = ~readb(sharpsl->io + ECCLPUB);
|
|
ecc_code[1] = ~readb(sharpsl->io + ECCLPLB);
|
|
ecc_code[2] = (~readb(sharpsl->io + ECCCP) << 2) | 0x03;
|
|
return readb(sharpsl->io + ECCCNTR) != 0;
|
|
}
|
|
|
|
/*
|
|
* Main initialization routine
|
|
*/
|
|
static int sharpsl_nand_probe(struct platform_device *pdev)
|
|
{
|
|
struct nand_chip *this;
|
|
struct resource *r;
|
|
int err = 0;
|
|
struct sharpsl_nand *sharpsl;
|
|
struct sharpsl_nand_platform_data *data = dev_get_platdata(&pdev->dev);
|
|
|
|
if (!data) {
|
|
dev_err(&pdev->dev, "no platform data!\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Allocate memory for MTD device structure and private data */
|
|
sharpsl = kzalloc(sizeof(struct sharpsl_nand), GFP_KERNEL);
|
|
if (!sharpsl) {
|
|
printk("Unable to allocate SharpSL NAND MTD device structure.\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!r) {
|
|
dev_err(&pdev->dev, "no io memory resource defined!\n");
|
|
err = -ENODEV;
|
|
goto err_get_res;
|
|
}
|
|
|
|
/* map physical address */
|
|
sharpsl->io = ioremap(r->start, resource_size(r));
|
|
if (!sharpsl->io) {
|
|
printk("ioremap to access Sharp SL NAND chip failed\n");
|
|
err = -EIO;
|
|
goto err_ioremap;
|
|
}
|
|
|
|
/* Get pointer to private data */
|
|
this = (struct nand_chip *)(&sharpsl->chip);
|
|
|
|
/* Link the private data with the MTD structure */
|
|
sharpsl->mtd.priv = this;
|
|
sharpsl->mtd.owner = THIS_MODULE;
|
|
|
|
platform_set_drvdata(pdev, sharpsl);
|
|
|
|
/*
|
|
* PXA initialize
|
|
*/
|
|
writeb(readb(sharpsl->io + FLASHCTL) | FLWP, sharpsl->io + FLASHCTL);
|
|
|
|
/* Set address of NAND IO lines */
|
|
this->IO_ADDR_R = sharpsl->io + FLASHIO;
|
|
this->IO_ADDR_W = sharpsl->io + FLASHIO;
|
|
/* Set address of hardware control function */
|
|
this->cmd_ctrl = sharpsl_nand_hwcontrol;
|
|
this->dev_ready = sharpsl_nand_dev_ready;
|
|
/* 15 us command delay time */
|
|
this->chip_delay = 15;
|
|
/* set eccmode using hardware ECC */
|
|
this->ecc.mode = NAND_ECC_HW;
|
|
this->ecc.size = 256;
|
|
this->ecc.bytes = 3;
|
|
this->ecc.strength = 1;
|
|
this->badblock_pattern = data->badblock_pattern;
|
|
this->ecc.layout = data->ecc_layout;
|
|
this->ecc.hwctl = sharpsl_nand_enable_hwecc;
|
|
this->ecc.calculate = sharpsl_nand_calculate_ecc;
|
|
this->ecc.correct = nand_correct_data;
|
|
|
|
/* Scan to find existence of the device */
|
|
err = nand_scan(&sharpsl->mtd, 1);
|
|
if (err)
|
|
goto err_scan;
|
|
|
|
/* Register the partitions */
|
|
sharpsl->mtd.name = "sharpsl-nand";
|
|
|
|
err = mtd_device_parse_register(&sharpsl->mtd, NULL, NULL,
|
|
data->partitions, data->nr_partitions);
|
|
if (err)
|
|
goto err_add;
|
|
|
|
/* Return happy */
|
|
return 0;
|
|
|
|
err_add:
|
|
nand_release(&sharpsl->mtd);
|
|
|
|
err_scan:
|
|
iounmap(sharpsl->io);
|
|
err_ioremap:
|
|
err_get_res:
|
|
kfree(sharpsl);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Clean up routine
|
|
*/
|
|
static int sharpsl_nand_remove(struct platform_device *pdev)
|
|
{
|
|
struct sharpsl_nand *sharpsl = platform_get_drvdata(pdev);
|
|
|
|
/* Release resources, unregister device */
|
|
nand_release(&sharpsl->mtd);
|
|
|
|
iounmap(sharpsl->io);
|
|
|
|
/* Free the MTD device structure */
|
|
kfree(sharpsl);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver sharpsl_nand_driver = {
|
|
.driver = {
|
|
.name = "sharpsl-nand",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = sharpsl_nand_probe,
|
|
.remove = sharpsl_nand_remove,
|
|
};
|
|
|
|
module_platform_driver(sharpsl_nand_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
|
|
MODULE_DESCRIPTION("Device specific logic for NAND flash on Sharp SL-C7xx Series");
|