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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
17 *
Thomas Gleixner61b03bd2005-11-07 11:15:49 +000018 * $Id: toto.c,v 1.5 2005/11/07 11:14:31 gleixner Exp $
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 */
20
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>
28#include <asm/io.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>
34
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +020035#define CONFIG_NAND_WORKAROUND 1
36
Linus Torvalds1da177e2005-04-16 15:20:36 -070037/*
38 * MTD structure for TOTO board
39 */
40static struct mtd_info *toto_mtd = NULL;
41
42static unsigned long toto_io_base = OMAP_FLASH_1_BASE;
43
Linus Torvalds1da177e2005-04-16 15:20:36 -070044/*
45 * Define partitions for flash devices
46 */
47
48static struct mtd_partition partition_info64M[] = {
49 { .name = "toto kernel partition 1",
50 .offset = 0,
51 .size = 2 * SZ_1M },
52 { .name = "toto file sys partition 2",
53 .offset = 2 * SZ_1M,
54 .size = 14 * SZ_1M },
55 { .name = "toto user partition 3",
56 .offset = 16 * SZ_1M,
57 .size = 16 * SZ_1M },
58 { .name = "toto devboard extra partition 4",
59 .offset = 32 * SZ_1M,
60 .size = 32 * SZ_1M },
61};
62
63static struct mtd_partition partition_info32M[] = {
64 { .name = "toto kernel partition 1",
65 .offset = 0,
66 .size = 2 * SZ_1M },
67 { .name = "toto file sys partition 2",
68 .offset = 2 * SZ_1M,
69 .size = 14 * SZ_1M },
70 { .name = "toto user partition 3",
71 .offset = 16 * SZ_1M,
72 .size = 16 * SZ_1M },
73};
74
75#define NUM_PARTITIONS32M 3
76#define NUM_PARTITIONS64M 4
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +020077
Thomas Gleixner61b03bd2005-11-07 11:15:49 +000078/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 * hardware specific access to control-lines
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +020080 *
81 * ctrl:
82 * NAND_NCE: bit 0 -> bit 14 (0x4000)
83 * NAND_CLE: bit 1 -> bit 12 (0x1000)
84 * NAND_ALE: bit 2 -> bit 1 (0x0002)
85 */
86static void toto_hwcontrol(struct mtd_info *mtd, int cmd,
87 unsigned int ctrl)
Linus Torvalds1da177e2005-04-16 15:20:36 -070088{
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +020089 struct nand_chip *chip = mtd->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +020091 if (ctrl & NAND_CTRL_CHANGE) {
92 unsigned long bits;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +020094 /* hopefully enough time for tc make proceding write to clear */
95 udelay(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +020097 bits = (~ctrl & NAND_NCE) << 14;
98 bits |= (ctrl & NAND_CLE) << 12;
99 bits |= (ctrl & NAND_ALE) >> 1;
100
101#warning Wild guess as gpiosetout() is nowhere defined in the kernel source - tglx
102 gpiosetout(0x5002, bits);
103
104#ifdef CONFIG_NAND_WORKAROUND
105 /* "some" dev boards busted, blue wired to rts2 :( */
106 rts2setout(2, (ctrl & NAND_CLE) << 1);
107#endif
108 /* allow time to ensure gpio state to over take memory write */
109 udelay(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 }
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +0200111
112 if (cmd != NAND_CMD_NONE)
113 writeb(cmd, chip->IO_ADDR_W);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114}
115
116/*
117 * Main initialization routine
118 */
David Woodhousecead4db2006-05-16 13:54:50 +0100119static int __init toto_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120{
121 struct nand_chip *this;
122 int err = 0;
123
124 /* Allocate memory for MTD device structure and private data */
David Woodhousee0c7d762006-05-13 18:07:53 +0100125 toto_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 if (!toto_mtd) {
David Woodhousee0c7d762006-05-13 18:07:53 +0100127 printk(KERN_WARNING "Unable to allocate toto NAND MTD device structure.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 err = -ENOMEM;
129 goto out;
130 }
131
132 /* Get pointer to private data */
David Woodhousee0c7d762006-05-13 18:07:53 +0100133 this = (struct nand_chip *)(&toto_mtd[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
135 /* Initialize structures */
David Woodhousee0c7d762006-05-13 18:07:53 +0100136 memset(toto_mtd, 0, sizeof(struct mtd_info));
137 memset(this, 0, sizeof(struct nand_chip));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
139 /* Link the private data with the MTD structure */
140 toto_mtd->priv = this;
David Woodhouse552d9202006-05-14 01:20:46 +0100141 toto_mtd->owner = THIS_MODULE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
143 /* Set address of NAND IO lines */
144 this->IO_ADDR_R = toto_io_base;
145 this->IO_ADDR_W = toto_io_base;
Thomas Gleixner7abd3ef2006-05-23 23:25:53 +0200146 this->cmd_ctrl = toto_hwcontrol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 this->dev_ready = NULL;
148 /* 25 us command delay time */
Thomas Gleixner61b03bd2005-11-07 11:15:49 +0000149 this->chip_delay = 30;
Thomas Gleixner6dfc6d22006-05-23 12:00:46 +0200150 this->ecc.mode = NAND_ECC_SOFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
David Woodhousee0c7d762006-05-13 18:07:53 +0100152 /* Scan to find existance of the device */
153 if (nand_scan(toto_mtd, 1)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 err = -ENXIO;
155 goto out_mtd;
156 }
157
158 /* Register the partitions */
David Woodhousee0c7d762006-05-13 18:07:53 +0100159 switch (toto_mtd->size) {
160 case SZ_64M:
161 add_mtd_partitions(toto_mtd, partition_info64M, NUM_PARTITIONS64M);
162 break;
163 case SZ_32M:
164 add_mtd_partitions(toto_mtd, partition_info32M, NUM_PARTITIONS32M);
165 break;
166 default:{
167 printk(KERN_WARNING "Unsupported Nand device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 err = -ENXIO;
169 goto out_buf;
170 }
171 }
172
David Woodhousee0c7d762006-05-13 18:07:53 +0100173 gpioreserve(NAND_MASK); /* claim our gpios */
174 archflashwp(0, 0); /* open up flash for writing */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
176 goto out;
Thomas Gleixner61b03bd2005-11-07 11:15:49 +0000177
David Woodhousee0c7d762006-05-13 18:07:53 +0100178 out_mtd:
179 kfree(toto_mtd);
180 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 return err;
182}
183
184module_init(toto_init);
185
186/*
187 * Clean up routine
188 */
David Woodhousee0c7d762006-05-13 18:07:53 +0100189static void __exit toto_cleanup(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190{
191 /* Release resources, unregister device */
David Woodhousee0c7d762006-05-13 18:07:53 +0100192 nand_release(toto_mtd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
194 /* Free the MTD device structure */
David Woodhousee0c7d762006-05-13 18:07:53 +0100195 kfree(toto_mtd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196
197 /* stop flash writes */
David Woodhousee0c7d762006-05-13 18:07:53 +0100198 archflashwp(0, 1);
Thomas Gleixner61b03bd2005-11-07 11:15:49 +0000199
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 /* release gpios to system */
David Woodhousee0c7d762006-05-13 18:07:53 +0100201 gpiorelease(NAND_MASK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202}
David Woodhousee0c7d762006-05-13 18:07:53 +0100203
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204module_exit(toto_cleanup);
205
206MODULE_LICENSE("GPL");
207MODULE_AUTHOR("Richard Woodruff <r-woodruff2@ti.com>");
208MODULE_DESCRIPTION("Glue layer for NAND flash on toto board");