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
18 * $Id: toto.c,v 1.5 2005/11/07 11:14:31 gleixner Exp $
21 #include <linux/slab.h>
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/delay.h>
25 #include <linux/mtd/mtd.h>
26 #include <linux/mtd/nand.h>
27 #include <linux/mtd/partitions.h>
29 #include <asm/arch/hardware.h>
30 #include <asm/sizes.h>
31 #include <asm/arch/toto.h>
32 #include <asm/arch-omap1510/hardware.h>
33 #include <asm/arch/gpio.h>
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;
42 #define CONFIG_NAND_WORKAROUND 1
44 #define NAND_NCE 0x4000
45 #define NAND_CLE 0x1000
46 #define NAND_ALE 0x0002
47 #define NAND_MASK (NAND_CLE | NAND_ALE | NAND_NCE)
49 #define T_NAND_CTL_CLRALE(iob) gpiosetout(NAND_ALE, 0)
50 #define T_NAND_CTL_SETALE(iob) gpiosetout(NAND_ALE, NAND_ALE)
51 #ifdef CONFIG_NAND_WORKAROUND /* "some" dev boards busted, blue wired to rts2 :( */
52 #define T_NAND_CTL_CLRCLE(iob) gpiosetout(NAND_CLE, 0); rts2setout(2, 2)
53 #define T_NAND_CTL_SETCLE(iob) gpiosetout(NAND_CLE, NAND_CLE); rts2setout(2, 0)
55 #define T_NAND_CTL_CLRCLE(iob) gpiosetout(NAND_CLE, 0)
56 #define T_NAND_CTL_SETCLE(iob) gpiosetout(NAND_CLE, NAND_CLE)
58 #define T_NAND_CTL_SETNCE(iob) gpiosetout(NAND_NCE, 0)
59 #define T_NAND_CTL_CLRNCE(iob) gpiosetout(NAND_NCE, NAND_NCE)
62 * Define partitions for flash devices
65 static struct mtd_partition partition_info64M[] = {
66 { .name = "toto kernel partition 1",
69 { .name = "toto file sys partition 2",
72 { .name = "toto user partition 3",
75 { .name = "toto devboard extra partition 4",
80 static struct mtd_partition partition_info32M[] = {
81 { .name = "toto kernel partition 1",
84 { .name = "toto file sys partition 2",
87 { .name = "toto user partition 3",
92 #define NUM_PARTITIONS32M 3
93 #define NUM_PARTITIONS64M 4
95 * hardware specific access to control-lines
98 static void toto_hwcontrol(struct mtd_info *mtd, int cmd)
101 udelay(1); /* hopefully enough time for tc make proceding write to clear */
103 case NAND_CTL_SETCLE: T_NAND_CTL_SETCLE(cmd); break;
104 case NAND_CTL_CLRCLE: T_NAND_CTL_CLRCLE(cmd); break;
106 case NAND_CTL_SETALE: T_NAND_CTL_SETALE(cmd); break;
107 case NAND_CTL_CLRALE: T_NAND_CTL_CLRALE(cmd); break;
109 case NAND_CTL_SETNCE: T_NAND_CTL_SETNCE(cmd); break;
110 case NAND_CTL_CLRNCE: T_NAND_CTL_CLRNCE(cmd); break;
112 udelay(1); /* allow time to ensure gpio state to over take memory write */
116 * Main initialization routine
118 int __init toto_init(void)
120 struct nand_chip *this;
123 /* Allocate memory for MTD device structure and private data */
124 toto_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
126 printk(KERN_WARNING "Unable to allocate toto NAND MTD device structure.\n");
131 /* Get pointer to private data */
132 this = (struct nand_chip *)(&toto_mtd[1]);
134 /* Initialize structures */
135 memset(toto_mtd, 0, sizeof(struct mtd_info));
136 memset(this, 0, sizeof(struct nand_chip));
138 /* Link the private data with the MTD structure */
139 toto_mtd->priv = this;
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->hwcontrol = toto_hwcontrol;
145 this->dev_ready = NULL;
146 /* 25 us command delay time */
147 this->chip_delay = 30;
148 this->eccmode = 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 */
177 kfree(this->data_buf);
184 module_init(toto_init);
189 static void __exit toto_cleanup(void)
191 /* Release resources, unregister device */
192 nand_release(toto_mtd);
194 /* Free the MTD device structure */
197 /* stop flash writes */
200 /* release gpios to system */
201 gpiorelease(NAND_MASK);
204 module_exit(toto_cleanup);
206 MODULE_LICENSE("GPL");
207 MODULE_AUTHOR("Richard Woodruff <r-woodruff2@ti.com>");
208 MODULE_DESCRIPTION("Glue layer for NAND flash on toto board");