| /* |
| * drivers/mtd/nand/h1910.c |
| * |
| * Copyright (C) 2003 Joshua Wise (joshua@joshuawise.com) |
| * |
| * Derived from drivers/mtd/nand/edb7312.c |
| * Copyright (C) 2002 Marius Gröger (mag@sysgo.de) |
| * Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de) |
| * |
| * $Id: h1910.c,v 1.6 2005/11/07 11:14:30 gleixner Exp $ |
| * |
| * 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 |
| * iPAQ h1910 board which utilizes the Samsung K9F2808 part. This is |
| * a 128Mibit (16MiB x 8 bits) NAND flash device. |
| */ |
| |
| #include <linux/slab.h> |
| #include <linux/init.h> |
| #include <linux/module.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> /* for CLPS7111_VIRT_BASE */ |
| #include <asm/sizes.h> |
| #include <asm/arch/h1900-gpio.h> |
| #include <asm/arch/ipaq.h> |
| |
| /* |
| * MTD structure for EDB7312 board |
| */ |
| static struct mtd_info *h1910_nand_mtd = NULL; |
| |
| /* |
| * Module stuff |
| */ |
| |
| #ifdef CONFIG_MTD_PARTITIONS |
| /* |
| * Define static partitions for flash device |
| */ |
| static struct mtd_partition partition_info[] = { |
| {name:"h1910 NAND Flash", |
| offset:0, |
| size:16 * 1024 * 1024} |
| }; |
| |
| #define NUM_PARTITIONS 1 |
| |
| #endif |
| |
| /* |
| * hardware specific access to control-lines |
| */ |
| static void h1910_hwcontrol(struct mtd_info *mtd, int cmd) |
| { |
| struct nand_chip *this = (struct nand_chip *)(mtd->priv); |
| |
| switch (cmd) { |
| |
| case NAND_CTL_SETCLE: |
| this->IO_ADDR_R |= (1 << 2); |
| this->IO_ADDR_W |= (1 << 2); |
| break; |
| case NAND_CTL_CLRCLE: |
| this->IO_ADDR_R &= ~(1 << 2); |
| this->IO_ADDR_W &= ~(1 << 2); |
| break; |
| |
| case NAND_CTL_SETALE: |
| this->IO_ADDR_R |= (1 << 3); |
| this->IO_ADDR_W |= (1 << 3); |
| break; |
| case NAND_CTL_CLRALE: |
| this->IO_ADDR_R &= ~(1 << 3); |
| this->IO_ADDR_W &= ~(1 << 3); |
| break; |
| |
| case NAND_CTL_SETNCE: |
| break; |
| case NAND_CTL_CLRNCE: |
| break; |
| } |
| } |
| |
| /* |
| * read device ready pin |
| */ |
| #if 0 |
| static int h1910_device_ready(struct mtd_info *mtd) |
| { |
| return (GPLR(55) & GPIO_bit(55)); |
| } |
| #endif |
| |
| /* |
| * Main initialization routine |
| */ |
| static int __init h1910_init(void) |
| { |
| struct nand_chip *this; |
| const char *part_type = 0; |
| int mtd_parts_nb = 0; |
| struct mtd_partition *mtd_parts = 0; |
| void __iomem *nandaddr; |
| |
| if (!machine_is_h1900()) |
| return -ENODEV; |
| |
| nandaddr = ioremap(0x08000000, 0x1000); |
| if (!nandaddr) { |
| printk("Failed to ioremap nand flash.\n"); |
| return -ENOMEM; |
| } |
| |
| /* Allocate memory for MTD device structure and private data */ |
| h1910_nand_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL); |
| if (!h1910_nand_mtd) { |
| printk("Unable to allocate h1910 NAND MTD device structure.\n"); |
| iounmap((void *)nandaddr); |
| return -ENOMEM; |
| } |
| |
| /* Get pointer to private data */ |
| this = (struct nand_chip *)(&h1910_nand_mtd[1]); |
| |
| /* Initialize structures */ |
| memset(h1910_nand_mtd, 0, sizeof(struct mtd_info)); |
| memset(this, 0, sizeof(struct nand_chip)); |
| |
| /* Link the private data with the MTD structure */ |
| h1910_nand_mtd->priv = this; |
| h1910_nand_mtd->owner = THIS_MODULE; |
| |
| /* |
| * Enable VPEN |
| */ |
| GPSR(37) = GPIO_bit(37); |
| |
| /* insert callbacks */ |
| this->IO_ADDR_R = nandaddr; |
| this->IO_ADDR_W = nandaddr; |
| this->hwcontrol = h1910_hwcontrol; |
| this->dev_ready = NULL; /* unknown whether that was correct or not so we will just do it like this */ |
| /* 15 us command delay time */ |
| this->chip_delay = 50; |
| this->ecc.mode = NAND_ECC_SOFT; |
| this->options = NAND_NO_AUTOINCR; |
| |
| /* Scan to find existence of the device */ |
| if (nand_scan(h1910_nand_mtd, 1)) { |
| printk(KERN_NOTICE "No NAND device - returning -ENXIO\n"); |
| kfree(h1910_nand_mtd); |
| iounmap((void *)nandaddr); |
| return -ENXIO; |
| } |
| #ifdef CONFIG_MTD_CMDLINE_PARTS |
| mtd_parts_nb = parse_cmdline_partitions(h1910_nand_mtd, &mtd_parts, "h1910-nand"); |
| if (mtd_parts_nb > 0) |
| part_type = "command line"; |
| else |
| mtd_parts_nb = 0; |
| #endif |
| if (mtd_parts_nb == 0) { |
| mtd_parts = partition_info; |
| mtd_parts_nb = NUM_PARTITIONS; |
| part_type = "static"; |
| } |
| |
| /* Register the partitions */ |
| printk(KERN_NOTICE "Using %s partition definition\n", part_type); |
| add_mtd_partitions(h1910_nand_mtd, mtd_parts, mtd_parts_nb); |
| |
| /* Return happy */ |
| return 0; |
| } |
| |
| module_init(h1910_init); |
| |
| /* |
| * Clean up routine |
| */ |
| static void __exit h1910_cleanup(void) |
| { |
| struct nand_chip *this = (struct nand_chip *)&h1910_nand_mtd[1]; |
| |
| /* Release resources, unregister device */ |
| nand_release(h1910_nand_mtd); |
| |
| /* Release io resource */ |
| iounmap((void *)this->IO_ADDR_W); |
| |
| /* Free the MTD device structure */ |
| kfree(h1910_nand_mtd); |
| } |
| |
| module_exit(h1910_cleanup); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Joshua Wise <joshua at joshuawise dot com>"); |
| MODULE_DESCRIPTION("NAND flash driver for iPAQ h1910"); |