-/*==============================================================================*/
-/* 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
- unsigned int init_ok;
-};
-
-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. */
-/*========================================================================*/
-
-
-unsigned get_rbnand_block_size(struct adm5120_nand_info *data)
-{
- return data->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, 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;
- }
-
- 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->init_ok = 0;
- 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);
- 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 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");
-
projects / openwrt.git / blobdiff