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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * drivers/mtd/nand/toto.c
3 *
4 * Copyright (c) 2003 Texas Instruments
5 *
6 * Derived from drivers/mtd/autcpu12.c
7 *
8 * Copyright (c) 2002 Thomas Gleixner <tgxl@linutronix.de>
9 *
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.
13 *
14 * Overview:
15 * This is a device driver for the NAND flash device found on the
16 * TI fido board. It supports 32MiB and 64MiB cards
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
18
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>
26#include <asm/io.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>
32
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +020033#define CONFIG_NAND_WORKAROUND 1
34
Linus Torvalds1da177e2005-04-16 15:20:36 -070035/*
36 * MTD structure for TOTO board
37 */
38static struct mtd_info *toto_mtd = NULL;
39
40static unsigned long toto_io_base = OMAP_FLASH_1_BASE;
41
Linus Torvalds1da177e2005-04-16 15:20:36 -070042/*
43 * Define partitions for flash devices
44 */
45
46static struct mtd_partition partition_info64M[] = {
47 { .name = "toto kernel partition 1",
48 .offset = 0,
49 .size = 2 * SZ_1M },
50 { .name = "toto file sys partition 2",
51 .offset = 2 * SZ_1M,
52 .size = 14 * SZ_1M },
53 { .name = "toto user partition 3",
54 .offset = 16 * SZ_1M,
55 .size = 16 * SZ_1M },
56 { .name = "toto devboard extra partition 4",
57 .offset = 32 * SZ_1M,
58 .size = 32 * SZ_1M },
59};
60
61static struct mtd_partition partition_info32M[] = {
62 { .name = "toto kernel partition 1",
63 .offset = 0,
64 .size = 2 * SZ_1M },
65 { .name = "toto file sys partition 2",
66 .offset = 2 * SZ_1M,
67 .size = 14 * SZ_1M },
68 { .name = "toto user partition 3",
69 .offset = 16 * SZ_1M,
70 .size = 16 * SZ_1M },
71};
72
73#define NUM_PARTITIONS32M 3
74#define NUM_PARTITIONS64M 4
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +020075
Thomas Gleixner61b03bd2005-11-07 11:15:49 +000076/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 * hardware specific access to control-lines
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +020078 *
79 * ctrl:
80 * NAND_NCE: bit 0 -> bit 14 (0x4000)
81 * NAND_CLE: bit 1 -> bit 12 (0x1000)
82 * NAND_ALE: bit 2 -> bit 1 (0x0002)
83 */
84static void toto_hwcontrol(struct mtd_info *mtd, int cmd,
85 unsigned int ctrl)
Linus Torvalds1da177e2005-04-16 15:20:36 -070086{
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +020087 struct nand_chip *chip = mtd->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +020089 if (ctrl & NAND_CTRL_CHANGE) {
90 unsigned long bits;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +020092 /* hopefully enough time for tc make proceding write to clear */
93 udelay(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +020095 bits = (~ctrl & NAND_NCE) << 14;
96 bits |= (ctrl & NAND_CLE) << 12;
97 bits |= (ctrl & NAND_ALE) >> 1;
98
99#warning Wild guess as gpiosetout() is nowhere defined in the kernel source - tglx
100 gpiosetout(0x5002, bits);
101
102#ifdef CONFIG_NAND_WORKAROUND
103 /* "some" dev boards busted, blue wired to rts2 :( */
104 rts2setout(2, (ctrl & NAND_CLE) << 1);
105#endif
106 /* allow time to ensure gpio state to over take memory write */
107 udelay(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 }
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +0200109
110 if (cmd != NAND_CMD_NONE)
111 writeb(cmd, chip->IO_ADDR_W);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112}
113
114/*
115 * Main initialization routine
116 */
David Woodhousecead4db2006-05-16 13:54:50 +0100117static int __init toto_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118{
119 struct nand_chip *this;
120 int err = 0;
121
122 /* Allocate memory for MTD device structure and private data */
David Woodhousee0c7d762006-05-13 18:07:53 +0100123 toto_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 if (!toto_mtd) {
David Woodhousee0c7d762006-05-13 18:07:53 +0100125 printk(KERN_WARNING "Unable to allocate toto NAND MTD device structure.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 err = -ENOMEM;
127 goto out;
128 }
129
130 /* Get pointer to private data */
David Woodhousee0c7d762006-05-13 18:07:53 +0100131 this = (struct nand_chip *)(&toto_mtd[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
133 /* Initialize structures */
David Woodhousee0c7d762006-05-13 18:07:53 +0100134 memset(toto_mtd, 0, sizeof(struct mtd_info));
135 memset(this, 0, sizeof(struct nand_chip));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
137 /* Link the private data with the MTD structure */
138 toto_mtd->priv = this;
David Woodhouse552d9202006-05-14 01:20:46 +0100139 toto_mtd->owner = THIS_MODULE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
141 /* Set address of NAND IO lines */
142 this->IO_ADDR_R = toto_io_base;
143 this->IO_ADDR_W = toto_io_base;
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +0200144 this->cmd_ctrl = toto_hwcontrol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 this->dev_ready = NULL;
146 /* 25 us command delay time */
Thomas Gleixner61b03bd2005-11-07 11:15:49 +0000147 this->chip_delay = 30;
Thomas Gleixner6dfc6d22006-05-23 12:00:46 +0200148 this->ecc.mode = NAND_ECC_SOFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
David Woodhousee0c7d762006-05-13 18:07:53 +0100150 /* Scan to find existance of the device */
151 if (nand_scan(toto_mtd, 1)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 err = -ENXIO;
153 goto out_mtd;
154 }
155
156 /* Register the partitions */
David Woodhousee0c7d762006-05-13 18:07:53 +0100157 switch (toto_mtd->size) {
158 case SZ_64M:
159 add_mtd_partitions(toto_mtd, partition_info64M, NUM_PARTITIONS64M);
160 break;
161 case SZ_32M:
162 add_mtd_partitions(toto_mtd, partition_info32M, NUM_PARTITIONS32M);
163 break;
164 default:{
165 printk(KERN_WARNING "Unsupported Nand device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 err = -ENXIO;
167 goto out_buf;
168 }
169 }
170
David Woodhousee0c7d762006-05-13 18:07:53 +0100171 gpioreserve(NAND_MASK); /* claim our gpios */
172 archflashwp(0, 0); /* open up flash for writing */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
174 goto out;
Thomas Gleixner61b03bd2005-11-07 11:15:49 +0000175
David Woodhousee0c7d762006-05-13 18:07:53 +0100176 out_mtd:
177 kfree(toto_mtd);
178 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 return err;
180}
181
182module_init(toto_init);
183
184/*
185 * Clean up routine
186 */
David Woodhousee0c7d762006-05-13 18:07:53 +0100187static void __exit toto_cleanup(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188{
189 /* Release resources, unregister device */
David Woodhousee0c7d762006-05-13 18:07:53 +0100190 nand_release(toto_mtd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
192 /* Free the MTD device structure */
David Woodhousee0c7d762006-05-13 18:07:53 +0100193 kfree(toto_mtd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
195 /* stop flash writes */
David Woodhousee0c7d762006-05-13 18:07:53 +0100196 archflashwp(0, 1);
Thomas Gleixner61b03bd2005-11-07 11:15:49 +0000197
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 /* release gpios to system */
David Woodhousee0c7d762006-05-13 18:07:53 +0100199 gpiorelease(NAND_MASK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200}
David Woodhousee0c7d762006-05-13 18:07:53 +0100201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202module_exit(toto_cleanup);
203
204MODULE_LICENSE("GPL");
205MODULE_AUTHOR("Richard Woodruff <r-woodruff2@ti.com>");
206MODULE_DESCRIPTION("Glue layer for NAND flash on toto board");