diff options
Diffstat (limited to 'drivers/mtd/nand/toto.c')
| -rw-r--r-- | drivers/mtd/nand/toto.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/drivers/mtd/nand/toto.c b/drivers/mtd/nand/toto.c new file mode 100644 index 000000000000..52c808fb5fa9 --- /dev/null +++ b/drivers/mtd/nand/toto.c @@ -0,0 +1,205 @@ +/* + * drivers/mtd/nand/toto.c + * + * Copyright (c) 2003 Texas Instruments + * + * Derived from drivers/mtd/autcpu12.c + * + * Copyright (c) 2002 Thomas Gleixner <tgxl@linutronix.de> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Overview: + * This is a device driver for the NAND flash device found on the + * TI fido board. It supports 32MiB and 64MiB cards + * + * $Id: toto.c,v 1.4 2004/10/05 13:50:20 gleixner Exp $ + */ + +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/nand.h> +#include <linux/mtd/partitions.h> +#include <asm/io.h> +#include <asm/arch/hardware.h> +#include <asm/sizes.h> +#include <asm/arch/toto.h> +#include <asm/arch-omap1510/hardware.h> +#include <asm/arch/gpio.h> + +/* + * MTD structure for TOTO board + */ +static struct mtd_info *toto_mtd = NULL; + +static unsigned long toto_io_base = OMAP_FLASH_1_BASE; + +#define CONFIG_NAND_WORKAROUND 1 + +#define NAND_NCE 0x4000 +#define NAND_CLE 0x1000 +#define NAND_ALE 0x0002 +#define NAND_MASK (NAND_CLE | NAND_ALE | NAND_NCE) + +#define T_NAND_CTL_CLRALE(iob) gpiosetout(NAND_ALE, 0) +#define T_NAND_CTL_SETALE(iob) gpiosetout(NAND_ALE, NAND_ALE) +#ifdef CONFIG_NAND_WORKAROUND /* "some" dev boards busted, blue wired to rts2 :( */ +#define T_NAND_CTL_CLRCLE(iob) gpiosetout(NAND_CLE, 0); rts2setout(2, 2) +#define T_NAND_CTL_SETCLE(iob) gpiosetout(NAND_CLE, NAND_CLE); rts2setout(2, 0) +#else +#define T_NAND_CTL_CLRCLE(iob) gpiosetout(NAND_CLE, 0) +#define T_NAND_CTL_SETCLE(iob) gpiosetout(NAND_CLE, NAND_CLE) +#endif +#define T_NAND_CTL_SETNCE(iob) gpiosetout(NAND_NCE, 0) +#define T_NAND_CTL_CLRNCE(iob) gpiosetout(NAND_NCE, NAND_NCE) + +/* + * Define partitions for flash devices + */ + +static struct mtd_partition partition_info64M[] = { + { .name = "toto kernel partition 1", + .offset = 0, + .size = 2 * SZ_1M }, + { .name = "toto file sys partition 2", + .offset = 2 * SZ_1M, + .size = 14 * SZ_1M }, + { .name = "toto user partition 3", + .offset = 16 * SZ_1M, + .size = 16 * SZ_1M }, + { .name = "toto devboard extra partition 4", + .offset = 32 * SZ_1M, + .size = 32 * SZ_1M }, +}; + +static struct mtd_partition partition_info32M[] = { + { .name = "toto kernel partition 1", + .offset = 0, + .size = 2 * SZ_1M }, + { .name = "toto file sys partition 2", + .offset = 2 * SZ_1M, + .size = 14 * SZ_1M }, + { .name = "toto user partition 3", + .offset = 16 * SZ_1M, + .size = 16 * SZ_1M }, +}; + +#define NUM_PARTITIONS32M 3 +#define NUM_PARTITIONS64M 4 +/* + * hardware specific access to control-lines +*/ + +static void toto_hwcontrol(struct mtd_info *mtd, int cmd) +{ + + udelay(1); /* hopefully enough time for tc make proceding write to clear */ + switch(cmd){ + + case NAND_CTL_SETCLE: T_NAND_CTL_SETCLE(cmd); break; + case NAND_CTL_CLRCLE: T_NAND_CTL_CLRCLE(cmd); break; + + case NAND_CTL_SETALE: T_NAND_CTL_SETALE(cmd); break; + case NAND_CTL_CLRALE: T_NAND_CTL_CLRALE(cmd); break; + + case NAND_CTL_SETNCE: T_NAND_CTL_SETNCE(cmd); break; + case NAND_CTL_CLRNCE: T_NAND_CTL_CLRNCE(cmd); break; + } + udelay(1); /* allow time to ensure gpio state to over take memory write */ +} + +/* + * Main initialization routine + */ +int __init toto_init (void) +{ + struct nand_chip *this; + int err = 0; + + /* Allocate memory for MTD device structure and private data */ + toto_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip), + GFP_KERNEL); + if (!toto_mtd) { + printk (KERN_WARNING "Unable to allocate toto NAND MTD device structure.\n"); + err = -ENOMEM; + goto out; + } + + /* Get pointer to private data */ + this = (struct nand_chip *) (&toto_mtd[1]); + + /* Initialize structures */ + memset((char *) toto_mtd, 0, sizeof(struct mtd_info)); + memset((char *) this, 0, sizeof(struct nand_chip)); + + /* Link the private data with the MTD structure */ + toto_mtd->priv = this; + + /* Set address of NAND IO lines */ + this->IO_ADDR_R = toto_io_base; + this->IO_ADDR_W = toto_io_base; + this->hwcontrol = toto_hwcontrol; + this->dev_ready = NULL; + /* 25 us command delay time */ + this->chip_delay = 30; + this->eccmode = NAND_ECC_SOFT; + + /* Scan to find existance of the device */ + if (nand_scan (toto_mtd, 1)) { + err = -ENXIO; + goto out_mtd; + } + + /* Register the partitions */ + switch(toto_mtd->size){ + case SZ_64M: add_mtd_partitions(toto_mtd, partition_info64M, NUM_PARTITIONS64M); break; + case SZ_32M: add_mtd_partitions(toto_mtd, partition_info32M, NUM_PARTITIONS32M); break; + default: { + printk (KERN_WARNING "Unsupported Nand device\n"); + err = -ENXIO; + goto out_buf; + } + } + + gpioreserve(NAND_MASK); /* claim our gpios */ + archflashwp(0,0); /* open up flash for writing */ + + goto out; + +out_buf: + kfree (this->data_buf); +out_mtd: + kfree (toto_mtd); +out: + return err; +} + +module_init(toto_init); + +/* + * Clean up routine + */ +static void __exit toto_cleanup (void) +{ + /* Release resources, unregister device */ + nand_release (toto_mtd); + + /* Free the MTD device structure */ + kfree (toto_mtd); + + /* stop flash writes */ + archflashwp(0,1); + + /* release gpios to system */ + gpiorelease(NAND_MASK); +} +module_exit(toto_cleanup); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Richard Woodruff <r-woodruff2@ti.com>"); +MODULE_DESCRIPTION("Glue layer for NAND flash on toto board"); |