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#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>
#define IDT434_REG_BASE ((volatile void *) KSEG1ADDR(0x18000000))
#define GPIOF 0x050000
#define GPIOC 0x050004
#define GPIOD 0x050008
#define GPIO_RDY (1 << 0x08)
#define GPIO_WPX (1 << 0x09)
#define GPIO_ALE (1 << 0x0a)
#define GPIO_CLE (1 << 0x0b)
#define DEV2BASE 0x010020
#define LO_WPX (1 << 0)
#define LO_ALE (1 << 1)
#define LO_CLE (1 << 2)
#define LO_CEX (1 << 3)
#define LO_FOFF (1 << 5)
#define LO_SPICS (1 << 6)
#define LO_ULED (1 << 7)
#define MEM32(x) *((volatile unsigned *) (x))
struct rb500_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
int init_ok;
int flags1;
int flags2;
};
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}
};
extern void changeLatchU5(unsigned char orMask, unsigned char nandMask);
static int rb500_dev_ready(struct mtd_info *mtd)
{
return MEM32(IDT434_REG_BASE + GPIOD) & GPIO_RDY;
}
/*
* hardware specific access to control-lines
*
* ctrl:
* NAND_CLE: bit 2 -> bit 3
* NAND_ALE: bit 3 -> bit 2
*/
static void rbmips_hwcontrol500(struct mtd_info *mtd, int cmd,
unsigned int ctrl)
{
struct nand_chip *chip = mtd->priv;
unsigned char orbits, nandbits;
if (ctrl & NAND_CTRL_CHANGE) {
orbits = (ctrl & NAND_CLE) << 1;
orbits |= (ctrl & NAND_ALE) >> 1;
nandbits = (~ctrl & NAND_CLE) << 1;
nandbits |= (~ctrl & NAND_ALE) >> 1;
changeLatchU5(orbits, nandbits);
}
if (cmd != NAND_CMD_NONE)
writeb(cmd, chip->IO_ADDR_W);
}
unsigned get_rbnand_block_size(struct rb500_nand_info *data)
{
if (data->init_ok)
return data->mtd.writesize;
else
return 0;
}
EXPORT_SYMBOL(get_rbnand_block_size);
static int rbmips_probe(struct platform_device *pdev)
{
struct rb500_nand_info *data;
int res = 0;
int *b;
/* Allocate memory for the 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, pdev->resource[0].end - pdev->resource[0].start + 1);
if (data->io_base == NULL) {
dev_err(&pdev->dev, "ioremap failed\n");
kfree(data);
return -EIO;
}
/* FIXME : this seems to work only for newer RB500, check the version to set the right flags accordingly */
data->flags1 = LO_FOFF | LO_CEX;
data->flags2 = LO_ULED | LO_ALE | LO_CLE | LO_WPX;
changeLatchU5(data->flags1, data->flags2);
data->chip.cmd_ctrl = rbmips_hwcontrol500;
data->chip.dev_ready = rb500_dev_ready;
data->chip.IO_ADDR_W = (unsigned char *)KSEG1ADDR(MEM32(IDT434_REG_BASE + DEV2BASE));
data->chip.IO_ADDR_R = data->chip.IO_ADDR_W;
data->chip.ecc.mode = NAND_ECC_SOFT;
data->chip.chip_delay = 25;
data->chip.options |= NAND_NO_AUTOINCR;
data->chip.priv = &data;
data->mtd.priv = &data->chip;
data->mtd.owner = THIS_MODULE;
b = (int *) KSEG1ADDR(0x18010020);
printk("dev2base 0x%08x mask 0x%08x c 0x%08x tc 0x%08x\n", b[0],
b[1], b[2], b[3]);
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 "RB500 nand device not found\n");
res = -ENXIO;
goto out;
}
printk(KERN_INFO "RB500 NAND\n");
add_mtd_partitions(&data->mtd, partition_info, 2);
data->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 rb500_nand_info *data = platform_get_drvdata(pdev);
nand_release(&data->mtd);
iounmap(data->io_base);
kfree(data);
return 0;
}
static struct platform_driver rb500_nand_driver = {
.probe = rbmips_probe,
.remove = rbmips_remove,
.driver = {
.name = "rb500-nand",
.owner = THIS_MODULE,
},
};
static int __init rb500_nand_init(void)
{
int err;
err = platform_driver_register(&rb500_nand_driver);
return err;
}
static void __exit rb500_nand_exit(void)
{
platform_driver_unregister(&rb500_nand_driver);
}
module_init(rb500_nand_init);
module_exit(rb500_nand_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Goodenough, Felix Fietkau, Florian Fainelli");
MODULE_DESCRIPTION("RouterBOARD 500 NAND driver");
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