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