1/* 2 * drivers/mtd/autcpu12.c 3 * 4 * Copyright (c) 2002 Thomas Gleixner <tgxl@linutronix.de> 5 * 6 * Derived from drivers/mtd/spia.c 7 * Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com) 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 * 13 * Overview: 14 * This is a device driver for the NAND flash device found on the 15 * autronix autcpu12 board, which is a SmartMediaCard. It supports 16 * 16MiB, 32MiB and 64MiB cards. 17 * 18 * 19 * 02-12-2002 TG Cleanup of module params 20 * 21 * 02-20-2002 TG adjusted for different rd/wr address support 22 * added support for read device ready/busy line 23 * added page_cache 24 * 25 * 10-06-2002 TG 128K card support added 26 */ 27 28#include <linux/slab.h> 29#include <linux/init.h> 30#include <linux/module.h> 31#include <linux/mtd/mtd.h> 32#include <linux/mtd/nand.h> 33#include <linux/mtd/partitions.h> 34#include <asm/io.h> 35#include <mach/hardware.h> 36#include <asm/sizes.h> 37#include <mach/autcpu12.h> 38 39/* 40 * MTD structure for AUTCPU12 board 41 */ 42static struct mtd_info *autcpu12_mtd = NULL; 43static void __iomem *autcpu12_fio_base; 44 45/* 46 * Define partitions for flash devices 47 */ 48static struct mtd_partition partition_info16k[] = { 49 { .name = "AUTCPU12 flash partition 1", 50 .offset = 0, 51 .size = 8 * SZ_1M }, 52 { .name = "AUTCPU12 flash partition 2", 53 .offset = 8 * SZ_1M, 54 .size = 8 * SZ_1M }, 55}; 56 57static struct mtd_partition partition_info32k[] = { 58 { .name = "AUTCPU12 flash partition 1", 59 .offset = 0, 60 .size = 8 * SZ_1M }, 61 { .name = "AUTCPU12 flash partition 2", 62 .offset = 8 * SZ_1M, 63 .size = 24 * SZ_1M }, 64}; 65 66static struct mtd_partition partition_info64k[] = { 67 { .name = "AUTCPU12 flash partition 1", 68 .offset = 0, 69 .size = 16 * SZ_1M }, 70 { .name = "AUTCPU12 flash partition 2", 71 .offset = 16 * SZ_1M, 72 .size = 48 * SZ_1M }, 73}; 74 75static struct mtd_partition partition_info128k[] = { 76 { .name = "AUTCPU12 flash partition 1", 77 .offset = 0, 78 .size = 16 * SZ_1M }, 79 { .name = "AUTCPU12 flash partition 2", 80 .offset = 16 * SZ_1M, 81 .size = 112 * SZ_1M }, 82}; 83 84#define NUM_PARTITIONS16K 2 85#define NUM_PARTITIONS32K 2 86#define NUM_PARTITIONS64K 2 87#define NUM_PARTITIONS128K 2 88/* 89 * hardware specific access to control-lines 90 * 91 * ALE bit 4 autcpu12_pedr 92 * CLE bit 5 autcpu12_pedr 93 * NCE bit 0 fio_ctrl 94 * 95 */ 96static void autcpu12_hwcontrol(struct mtd_info *mtd, int cmd, 97 unsigned int ctrl) 98{ 99 struct nand_chip *chip = mtd->priv; 100 101 if (ctrl & NAND_CTRL_CHANGE) { 102 void __iomem *addr; 103 unsigned char bits; 104 105 addr = CS89712_VIRT_BASE + AUTCPU12_SMC_PORT_OFFSET; 106 bits = (ctrl & NAND_CLE) << 4; 107 bits |= (ctrl & NAND_ALE) << 2; 108 writeb((readb(addr) & ~0x30) | bits, addr); 109 110 addr = autcpu12_fio_base + AUTCPU12_SMC_SELECT_OFFSET; 111 writeb((readb(addr) & ~0x1) | (ctrl & NAND_NCE), addr); 112 } 113 114 if (cmd != NAND_CMD_NONE) 115 writeb(cmd, chip->IO_ADDR_W); 116} 117 118/* 119 * read device ready pin 120 */ 121int autcpu12_device_ready(struct mtd_info *mtd) 122{ 123 void __iomem *addr = CS89712_VIRT_BASE + AUTCPU12_SMC_PORT_OFFSET; 124 125 return readb(addr) & AUTCPU12_SMC_RDY; 126} 127 128/* 129 * Main initialization routine 130 */ 131static int __init autcpu12_init(void) 132{ 133 struct nand_chip *this; 134 int err = 0; 135 136 /* Allocate memory for MTD device structure and private data */ 137 autcpu12_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), 138 GFP_KERNEL); 139 if (!autcpu12_mtd) { 140 printk("Unable to allocate AUTCPU12 NAND MTD device structure.\n"); 141 err = -ENOMEM; 142 goto out; 143 } 144 145 /* map physical address */ 146 autcpu12_fio_base = ioremap(AUTCPU12_PHYS_SMC, SZ_1K); 147 if (!autcpu12_fio_base) { 148 printk("Ioremap autcpu12 SmartMedia Card failed\n"); 149 err = -EIO; 150 goto out_mtd; 151 } 152 153 /* Get pointer to private data */ 154 this = (struct nand_chip *)(&autcpu12_mtd[1]); 155 156 /* Initialize structures */ 157 memset(autcpu12_mtd, 0, sizeof(struct mtd_info)); 158 memset(this, 0, sizeof(struct nand_chip)); 159 160 /* Link the private data with the MTD structure */ 161 autcpu12_mtd->priv = this; 162 autcpu12_mtd->owner = THIS_MODULE; 163 164 /* Set address of NAND IO lines */ 165 this->IO_ADDR_R = autcpu12_fio_base; 166 this->IO_ADDR_W = autcpu12_fio_base; 167 this->cmd_ctrl = autcpu12_hwcontrol; 168 this->dev_ready = autcpu12_device_ready; 169 /* 20 us command delay time */ 170 this->chip_delay = 20; 171 this->ecc.mode = NAND_ECC_SOFT; 172 173 /* Enable the following for a flash based bad block table */ 174 /* 175 this->options = NAND_USE_FLASH_BBT; 176 */ 177 this->options = NAND_USE_FLASH_BBT; 178 179 /* Scan to find existance of the device */ 180 if (nand_scan(autcpu12_mtd, 1)) { 181 err = -ENXIO; 182 goto out_ior; 183 } 184 185 /* Register the partitions */ 186 switch (autcpu12_mtd->size) { 187 case SZ_16M: 188 add_mtd_partitions(autcpu12_mtd, partition_info16k, 189 NUM_PARTITIONS16K); 190 break; 191 case SZ_32M: 192 add_mtd_partitions(autcpu12_mtd, partition_info32k, 193 NUM_PARTITIONS32K); 194 break; 195 case SZ_64M: 196 add_mtd_partitions(autcpu12_mtd, partition_info64k, 197 NUM_PARTITIONS64K); 198 break; 199 case SZ_128M: 200 add_mtd_partitions(autcpu12_mtd, partition_info128k, 201 NUM_PARTITIONS128K); 202 break; 203 default: 204 printk("Unsupported SmartMedia device\n"); 205 err = -ENXIO; 206 goto out_ior; 207 } 208 goto out; 209 210 out_ior: 211 iounmap(autcpu12_fio_base); 212 out_mtd: 213 kfree(autcpu12_mtd); 214 out: 215 return err; 216} 217 218module_init(autcpu12_init); 219 220/* 221 * Clean up routine 222 */ 223static void __exit autcpu12_cleanup(void) 224{ 225 /* Release resources, unregister device */ 226 nand_release(autcpu12_mtd); 227 228 /* unmap physical address */ 229 iounmap(autcpu12_fio_base); 230 231 /* Free the MTD device structure */ 232 kfree(autcpu12_mtd); 233} 234 235module_exit(autcpu12_cleanup); 236 237MODULE_LICENSE("GPL"); 238MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>"); 239MODULE_DESCRIPTION("Glue layer for SmartMediaCard on autronix autcpu12"); 240