2 * drivers/mtd/nand/toto.c
4 * Copyright (c) 2003 Texas Instruments
6 * Derived from drivers/mtd/autcpu12.c
8 * Copyright (c) 2002 Thomas Gleixner <tgxl@linutronix.de>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 * This is a device driver for the NAND flash device found on the
16 * TI fido board. It supports 32MiB and 64MiB cards
19 #include <linux/slab.h>
20 #include <linux/init.h>
21 #include <linux/module.h>
22 #include <linux/delay.h>
23 #include <linux/mtd/mtd.h>
24 #include <linux/mtd/nand.h>
25 #include <linux/mtd/partitions.h>
27 #include <asm/arch/hardware.h>
28 #include <asm/sizes.h>
29 #include <asm/arch/toto.h>
30 #include <asm/arch-omap1510/hardware.h>
31 #include <asm/arch/gpio.h>
33 #define CONFIG_NAND_WORKAROUND 1
36 * MTD structure for TOTO board
38 static struct mtd_info *toto_mtd = NULL;
40 static unsigned long toto_io_base = OMAP_FLASH_1_BASE;
43 * Define partitions for flash devices
46 static struct mtd_partition partition_info64M[] = {
47 { .name = "toto kernel partition 1",
50 { .name = "toto file sys partition 2",
53 { .name = "toto user partition 3",
56 { .name = "toto devboard extra partition 4",
61 static struct mtd_partition partition_info32M[] = {
62 { .name = "toto kernel partition 1",
65 { .name = "toto file sys partition 2",
68 { .name = "toto user partition 3",
73 #define NUM_PARTITIONS32M 3
74 #define NUM_PARTITIONS64M 4
77 * hardware specific access to control-lines
80 * NAND_NCE: bit 0 -> bit 14 (0x4000)
81 * NAND_CLE: bit 1 -> bit 12 (0x1000)
82 * NAND_ALE: bit 2 -> bit 1 (0x0002)
84 static void toto_hwcontrol(struct mtd_info *mtd, int cmd,
87 struct nand_chip *chip = mtd->priv;
89 if (ctrl & NAND_CTRL_CHANGE) {
92 /* hopefully enough time for tc make proceding write to clear */
95 bits = (~ctrl & NAND_NCE) << 14;
96 bits |= (ctrl & NAND_CLE) << 12;
97 bits |= (ctrl & NAND_ALE) >> 1;
99 #warning Wild guess as gpiosetout() is nowhere defined in the kernel source - tglx
100 gpiosetout(0x5002, bits);
102 #ifdef CONFIG_NAND_WORKAROUND
103 /* "some" dev boards busted, blue wired to rts2 :( */
104 rts2setout(2, (ctrl & NAND_CLE) << 1);
106 /* allow time to ensure gpio state to over take memory write */
110 if (cmd != NAND_CMD_NONE)
111 writeb(cmd, chip->IO_ADDR_W);
115 * Main initialization routine
117 static int __init toto_init(void)
119 struct nand_chip *this;
122 /* Allocate memory for MTD device structure and private data */
123 toto_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
125 printk(KERN_WARNING "Unable to allocate toto NAND MTD device structure.\n");
130 /* Get pointer to private data */
131 this = (struct nand_chip *)(&toto_mtd[1]);
133 /* Initialize structures */
134 memset(toto_mtd, 0, sizeof(struct mtd_info));
135 memset(this, 0, sizeof(struct nand_chip));
137 /* Link the private data with the MTD structure */
138 toto_mtd->priv = this;
139 toto_mtd->owner = THIS_MODULE;
141 /* Set address of NAND IO lines */
142 this->IO_ADDR_R = toto_io_base;
143 this->IO_ADDR_W = toto_io_base;
144 this->cmd_ctrl = toto_hwcontrol;
145 this->dev_ready = NULL;
146 /* 25 us command delay time */
147 this->chip_delay = 30;
148 this->ecc.mode = NAND_ECC_SOFT;
150 /* Scan to find existance of the device */
151 if (nand_scan(toto_mtd, 1)) {
156 /* Register the partitions */
157 switch (toto_mtd->size) {
159 add_mtd_partitions(toto_mtd, partition_info64M, NUM_PARTITIONS64M);
162 add_mtd_partitions(toto_mtd, partition_info32M, NUM_PARTITIONS32M);
165 printk(KERN_WARNING "Unsupported Nand device\n");
171 gpioreserve(NAND_MASK); /* claim our gpios */
172 archflashwp(0, 0); /* open up flash for writing */
182 module_init(toto_init);
187 static void __exit toto_cleanup(void)
189 /* Release resources, unregister device */
190 nand_release(toto_mtd);
192 /* Free the MTD device structure */
195 /* stop flash writes */
198 /* release gpios to system */
199 gpiorelease(NAND_MASK);
202 module_exit(toto_cleanup);
204 MODULE_LICENSE("GPL");
205 MODULE_AUTHOR("Richard Woodruff <r-woodruff2@ti.com>");
206 MODULE_DESCRIPTION("Glue layer for NAND flash on toto board");