diff options
Diffstat (limited to 'target/linux/rb532/files/drivers/mtd/nand/rbmipsnand.c')
| -rw-r--r-- | target/linux/rb532/files/drivers/mtd/nand/rbmipsnand.c | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/target/linux/rb532/files/drivers/mtd/nand/rbmipsnand.c b/target/linux/rb532/files/drivers/mtd/nand/rbmipsnand.c new file mode 100644 index 0000000..35febc6 --- /dev/null +++ b/target/linux/rb532/files/drivers/mtd/nand/rbmipsnand.c @@ -0,0 +1,219 @@ +#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)) + +extern unsigned int board_type; + +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; + } + + if (board_type > 500) { + data->flags1 = LO_FOFF | LO_CEX; + data->flags2 = LO_ULED | LO_ALE | LO_CLE | LO_WPX; + } + else { + data->flags1 = LO_WPX | LO_FOFF | LO_CEX; + data->flags2 = LO_ULED | LO_ALE | LO_CLE; + } + + 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"); |