Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * drivers/mtd/nand/h1910.c |
| 3 | * |
| 4 | * Copyright (C) 2003 Joshua Wise (joshua@joshuawise.com) |
| 5 | * |
| 6 | * Derived from drivers/mtd/nand/edb7312.c |
| 7 | * Copyright (C) 2002 Marius Gröger (mag@sysgo.de) |
| 8 | * Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de) |
| 9 | * |
| 10 | * $Id: h1910.c,v 1.5 2004/11/04 12:53:10 gleixner Exp $ |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License version 2 as |
| 14 | * published by the Free Software Foundation. |
| 15 | * |
| 16 | * Overview: |
| 17 | * This is a device driver for the NAND flash device found on the |
| 18 | * iPAQ h1910 board which utilizes the Samsung K9F2808 part. This is |
| 19 | * a 128Mibit (16MiB x 8 bits) NAND flash device. |
| 20 | */ |
| 21 | |
| 22 | #include <linux/slab.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/mtd/mtd.h> |
| 26 | #include <linux/mtd/nand.h> |
| 27 | #include <linux/mtd/partitions.h> |
| 28 | #include <asm/io.h> |
| 29 | #include <asm/arch/hardware.h> /* for CLPS7111_VIRT_BASE */ |
| 30 | #include <asm/sizes.h> |
| 31 | #include <asm/arch/h1900-gpio.h> |
| 32 | #include <asm/arch/ipaq.h> |
| 33 | |
| 34 | /* |
| 35 | * MTD structure for EDB7312 board |
| 36 | */ |
| 37 | static struct mtd_info *h1910_nand_mtd = NULL; |
| 38 | |
| 39 | /* |
| 40 | * Module stuff |
| 41 | */ |
| 42 | |
| 43 | #ifdef CONFIG_MTD_PARTITIONS |
| 44 | /* |
| 45 | * Define static partitions for flash device |
| 46 | */ |
| 47 | static struct mtd_partition partition_info[] = { |
| 48 | { name: "h1910 NAND Flash", |
| 49 | offset: 0, |
| 50 | size: 16*1024*1024 } |
| 51 | }; |
| 52 | #define NUM_PARTITIONS 1 |
| 53 | |
| 54 | #endif |
| 55 | |
| 56 | |
| 57 | /* |
| 58 | * hardware specific access to control-lines |
| 59 | */ |
| 60 | static void h1910_hwcontrol(struct mtd_info *mtd, int cmd) |
| 61 | { |
| 62 | struct nand_chip* this = (struct nand_chip *) (mtd->priv); |
| 63 | |
| 64 | switch(cmd) { |
| 65 | |
| 66 | case NAND_CTL_SETCLE: |
| 67 | this->IO_ADDR_R |= (1 << 2); |
| 68 | this->IO_ADDR_W |= (1 << 2); |
| 69 | break; |
| 70 | case NAND_CTL_CLRCLE: |
| 71 | this->IO_ADDR_R &= ~(1 << 2); |
| 72 | this->IO_ADDR_W &= ~(1 << 2); |
| 73 | break; |
| 74 | |
| 75 | case NAND_CTL_SETALE: |
| 76 | this->IO_ADDR_R |= (1 << 3); |
| 77 | this->IO_ADDR_W |= (1 << 3); |
| 78 | break; |
| 79 | case NAND_CTL_CLRALE: |
| 80 | this->IO_ADDR_R &= ~(1 << 3); |
| 81 | this->IO_ADDR_W &= ~(1 << 3); |
| 82 | break; |
| 83 | |
| 84 | case NAND_CTL_SETNCE: |
| 85 | break; |
| 86 | case NAND_CTL_CLRNCE: |
| 87 | break; |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | /* |
| 92 | * read device ready pin |
| 93 | */ |
| 94 | #if 0 |
| 95 | static int h1910_device_ready(struct mtd_info *mtd) |
| 96 | { |
| 97 | return (GPLR(55) & GPIO_bit(55)); |
| 98 | } |
| 99 | #endif |
| 100 | |
| 101 | /* |
| 102 | * Main initialization routine |
| 103 | */ |
| 104 | static int __init h1910_init (void) |
| 105 | { |
| 106 | struct nand_chip *this; |
| 107 | const char *part_type = 0; |
| 108 | int mtd_parts_nb = 0; |
| 109 | struct mtd_partition *mtd_parts = 0; |
| 110 | void __iomem *nandaddr; |
| 111 | |
| 112 | if (!machine_is_h1900()) |
| 113 | return -ENODEV; |
| 114 | |
| 115 | nandaddr = __ioremap(0x08000000, 0x1000, 0, 1); |
| 116 | if (!nandaddr) { |
| 117 | printk("Failed to ioremap nand flash.\n"); |
| 118 | return -ENOMEM; |
| 119 | } |
| 120 | |
| 121 | /* Allocate memory for MTD device structure and private data */ |
| 122 | h1910_nand_mtd = kmalloc(sizeof(struct mtd_info) + |
| 123 | sizeof(struct nand_chip), |
| 124 | GFP_KERNEL); |
| 125 | if (!h1910_nand_mtd) { |
| 126 | printk("Unable to allocate h1910 NAND MTD device structure.\n"); |
| 127 | iounmap ((void *) nandaddr); |
| 128 | return -ENOMEM; |
| 129 | } |
| 130 | |
| 131 | /* Get pointer to private data */ |
| 132 | this = (struct nand_chip *) (&h1910_nand_mtd[1]); |
| 133 | |
| 134 | /* Initialize structures */ |
| 135 | memset((char *) h1910_nand_mtd, 0, sizeof(struct mtd_info)); |
| 136 | memset((char *) this, 0, sizeof(struct nand_chip)); |
| 137 | |
| 138 | /* Link the private data with the MTD structure */ |
| 139 | h1910_nand_mtd->priv = this; |
| 140 | |
| 141 | /* |
| 142 | * Enable VPEN |
| 143 | */ |
| 144 | GPSR(37) = GPIO_bit(37); |
| 145 | |
| 146 | /* insert callbacks */ |
| 147 | this->IO_ADDR_R = nandaddr; |
| 148 | this->IO_ADDR_W = nandaddr; |
| 149 | this->hwcontrol = h1910_hwcontrol; |
| 150 | this->dev_ready = NULL; /* unknown whether that was correct or not so we will just do it like this */ |
| 151 | /* 15 us command delay time */ |
| 152 | this->chip_delay = 50; |
| 153 | this->eccmode = NAND_ECC_SOFT; |
| 154 | this->options = NAND_NO_AUTOINCR; |
| 155 | |
| 156 | /* Scan to find existence of the device */ |
| 157 | if (nand_scan (h1910_nand_mtd, 1)) { |
| 158 | printk(KERN_NOTICE "No NAND device - returning -ENXIO\n"); |
| 159 | kfree (h1910_nand_mtd); |
| 160 | iounmap ((void *) nandaddr); |
| 161 | return -ENXIO; |
| 162 | } |
| 163 | |
| 164 | #ifdef CONFIG_MTD_CMDLINE_PARTS |
| 165 | mtd_parts_nb = parse_cmdline_partitions(h1910_nand_mtd, &mtd_parts, |
| 166 | "h1910-nand"); |
| 167 | if (mtd_parts_nb > 0) |
| 168 | part_type = "command line"; |
| 169 | else |
| 170 | mtd_parts_nb = 0; |
| 171 | #endif |
| 172 | if (mtd_parts_nb == 0) |
| 173 | { |
| 174 | mtd_parts = partition_info; |
| 175 | mtd_parts_nb = NUM_PARTITIONS; |
| 176 | part_type = "static"; |
| 177 | } |
| 178 | |
| 179 | /* Register the partitions */ |
| 180 | printk(KERN_NOTICE "Using %s partition definition\n", part_type); |
| 181 | add_mtd_partitions(h1910_nand_mtd, mtd_parts, mtd_parts_nb); |
| 182 | |
| 183 | /* Return happy */ |
| 184 | return 0; |
| 185 | } |
| 186 | module_init(h1910_init); |
| 187 | |
| 188 | /* |
| 189 | * Clean up routine |
| 190 | */ |
| 191 | static void __exit h1910_cleanup (void) |
| 192 | { |
| 193 | struct nand_chip *this = (struct nand_chip *) &h1910_nand_mtd[1]; |
| 194 | |
| 195 | /* Release resources, unregister device */ |
| 196 | nand_release (h1910_nand_mtd); |
| 197 | |
| 198 | /* Release io resource */ |
| 199 | iounmap ((void *) this->IO_ADDR_W); |
| 200 | |
| 201 | /* Free the MTD device structure */ |
| 202 | kfree (h1910_nand_mtd); |
| 203 | } |
| 204 | module_exit(h1910_cleanup); |
| 205 | |
| 206 | MODULE_LICENSE("GPL"); |
| 207 | MODULE_AUTHOR("Joshua Wise <joshua at joshuawise dot com>"); |
| 208 | MODULE_DESCRIPTION("NAND flash driver for iPAQ h1910"); |