diff options
Diffstat (limited to 'target/linux/adm5120/files/drivers/mtd/nand/rbmipsnand.c')
| -rw-r--r-- | target/linux/adm5120/files/drivers/mtd/nand/rbmipsnand.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/target/linux/adm5120/files/drivers/mtd/nand/rbmipsnand.c b/target/linux/adm5120/files/drivers/mtd/nand/rbmipsnand.c new file mode 100644 index 000000000..2e7059d18 --- /dev/null +++ b/target/linux/adm5120/files/drivers/mtd/nand/rbmipsnand.c @@ -0,0 +1,207 @@ +/*==============================================================================*/ +/* 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"); + |