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/*==============================================================================*/
/* rbmipsnand.c */
/* This module is derived from the 2.4 driver shipped by Microtik for their */
/* Routerboard 1xx and 5xx series boards. It provides support for the built in */
/* NAND flash on the Routerboard 1xx series boards for Linux 2.6.19+. */
/* Licence: Original Microtik code seems not to have a licence. */
/* Rewritten code all GPL V2. */
/* Copyright(C) 2007 david.goodenough@linkchoose.co.uk (for rewriten code) */
/*==============================================================================*/
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/bootinfo.h>
#include <asm/mach-adm5120/adm5120_info.h>
#include <asm/mach-adm5120/adm5120_defs.h>
#define SMEM1(x) (*((volatile unsigned char *) (KSEG1ADDR(ADM5120_SRAM1_BASE) + x)))
#define NAND_RW_REG 0x0 //data register
#define NAND_SET_CEn 0x1 //CE# low
#define NAND_CLR_CEn 0x2 //CE# high
#define NAND_CLR_CLE 0x3 //CLE low
#define NAND_SET_CLE 0x4 //CLE high
#define NAND_CLR_ALE 0x5 //ALE low
#define NAND_SET_ALE 0x6 //ALE high
#define NAND_SET_SPn 0x7 //SP# low (use spare area)
#define NAND_CLR_SPn 0x8 //SP# high (do not use spare area)
#define NAND_SET_WPn 0x9 //WP# low
#define NAND_CLR_WPn 0xA //WP# high
#define NAND_STS_REG 0xB //Status register
#define MEM32(x) *((volatile unsigned *) (x))
static struct mtd_partition partition_info[] = {
{
name: "RouterBoard NAND Boot",
offset: 0,
size: 4 * 1024 * 1024
},
{
name: "rootfs",
offset: MTDPART_OFS_NXTBLK,
size: MTDPART_SIZ_FULL
}
};
static struct nand_ecclayout rb_ecclayout = {
.eccbytes = 6,
.eccpos = { 8, 9, 10, 13, 14, 15 },
.oobavail = 9,
.oobfree = { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1} }
};
struct adm5120_nand_info {
struct nand_chip chip;
struct mtd_info mtd;
void __iomem *io_base;
#ifdef CONFIG_MTD_PARTITIONS
int nr_parts;
struct mtd_partition *parts;
#endif
};
static int rb100_dev_ready(struct mtd_info *mtd)
{
return SMEM1(NAND_STS_REG) & 0x80;
}
static void rbmips_hwcontrol100(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
struct nand_chip *chip = mtd->priv;
if (ctrl & NAND_CTRL_CHANGE)
{
SMEM1((( ctrl & NAND_CLE) ? NAND_SET_CLE : NAND_CLR_CLE)) = 0x01;
SMEM1((( ctrl & NAND_ALE) ? NAND_SET_ALE : NAND_CLR_ALE)) = 0x01;
SMEM1((( ctrl & NAND_NCE) ? NAND_SET_CEn : NAND_CLR_CEn)) = 0x01;
}
if (cmd != NAND_CMD_NONE)
writeb( cmd, chip->IO_ADDR_W);
}
/*========================================================================*/
/* We need to use the OLD Yaffs-1 OOB layout, otherwise the RB bootloader */
/* will not be able to find the kernel that we load. So set the oobinfo */
/* when creating the partitions. */
/*========================================================================*/
static unsigned init_ok = 0;
unsigned get_rbnand_block_size(struct adm5120_nand_info *data)
{
return init_ok ? data->mtd.writesize : 0;
}
EXPORT_SYMBOL(get_rbnand_block_size);
static int rbmips_probe(struct platform_device *pdev)
{
struct adm5120_nand_info *data;
int res = 0;
/* Allocate memory for the nand_chip structure */
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data) {
dev_err(&pdev->dev, "Failed to allocate device structure\n");
return -ENOMEM;
}
data->io_base = ioremap(pdev->resource[0].start, 0x1000);
if (data->io_base == NULL) {
dev_err(&pdev->dev, "ioremap failed\n");
kfree(data);
return -EIO;
}
MEM32(0xB2000064) = 0x100;
MEM32(0xB2000008) = 0x1;
SMEM1(NAND_SET_SPn) = 0x01;
SMEM1(NAND_CLR_WPn) = 0x01;
data->chip.priv = &data;
data->mtd.priv = &data->chip;
data->mtd.owner = THIS_MODULE;
data->chip.IO_ADDR_R = (unsigned char *)KSEG1ADDR(ADM5120_SRAM1_BASE);
data->chip.IO_ADDR_W = data->chip.IO_ADDR_R;
data->chip.cmd_ctrl = rbmips_hwcontrol100;
data->chip.dev_ready = rb100_dev_ready;
data->chip.ecc.mode = NAND_ECC_SOFT;
data->chip.ecc.layout = &rb_ecclayout;
data->chip.chip_delay = 25;
data->chip.options |= NAND_NO_AUTOINCR;
platform_set_drvdata(pdev, data);
/* Why do we need to scan 4 times ? */
if (nand_scan(&data->mtd, 1) && nand_scan(&data->mtd, 1) && nand_scan(&data->mtd, 1) && nand_scan(&data->mtd, 1)) {
printk(KERN_INFO "RB1xxx nand device not found\n");
res = -ENXIO;
goto out;
}
add_mtd_partitions(&data->mtd, partition_info, 2);
init_ok = 1;
res = add_mtd_device(&data->mtd);
if (!res)
return res;
nand_release(&data->mtd);
out:
platform_set_drvdata(pdev, NULL);
iounmap(data->io_base);
kfree(data);
return res;
}
static int __devexit rbmips_remove(struct platform_device *pdev)
{
struct adm5120_nand_info *data = platform_get_drvdata(pdev);
nand_release(&data->mtd);
iounmap(data->io_base);
kfree(data);
return 0;
}
static struct platform_driver adm5120_nand_driver = {
.probe = rbmips_probe,
.remove = rbmips_remove,
.driver = {
.name = "adm5120-nand",
.owner = THIS_MODULE,
},
};
static int __init adm5120_nand_init(void)
{
int err;
err = platform_driver_register(&adm5120_nand_driver);
return err;
}
static void __exit adm5120_nand_exit(void)
{
platform_driver_unregister(&adm5120_nand_driver);
}
module_init(adm5120_nand_init);
module_exit(adm5120_nand_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Goodenough, Florian Fainelli");
MODULE_DESCRIPTION("RouterBOARD 100 NAND driver");
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