1 /*
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 *
18 * $Id: toto.c,v 1.5 2005/11/07 11:14:31 gleixner Exp $
19 */
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
35 #define CONFIG_NAND_WORKAROUND 1
36
37 /*
38 * MTD structure for TOTO board
39 */
40 static struct mtd_info *toto_mtd = NULL;
41
42 static unsigned long toto_io_base = OMAP_FLASH_1_BASE;
43
44 /*
45 * Define partitions for flash devices
46 */
47
48 static 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
63 static 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
77
78 /*
79 * hardware specific access to control-lines
80 *
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 */
86 static void toto_hwcontrol(struct mtd_info *mtd, int cmd,
87 unsigned int ctrl)
88 {
89 struct nand_chip *chip = mtd->priv;
90
91 if (ctrl & NAND_CTRL_CHANGE) {
92 unsigned long bits;
93
94 /* hopefully enough time for tc make proceding write to clear */
95 udelay(1);
96
97 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);
110 }
111
112 if (cmd != NAND_CMD_NONE)
113 writeb(cmd, chip->IO_ADDR_W);
114 }
115
116 /*
117 * Main initialization routine
118 */
119 static int __init toto_init(void)
120 {
121 struct nand_chip *this;
122 int err = 0;
123
124 /* Allocate memory for MTD device structure and private data */
125 toto_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
126 if (!toto_mtd) {
127 printk(KERN_WARNING "Unable to allocate toto NAND MTD device structure.\n");
128 err = -ENOMEM;
129 goto out;
130 }
131
132 /* Get pointer to private data */
133 this = (struct nand_chip *)(&toto_mtd[1]);
134
135 /* Initialize structures */
136 memset(toto_mtd, 0, sizeof(struct mtd_info));
137 memset(this, 0, sizeof(struct nand_chip));
138
139 /* Link the private data with the MTD structure */
140 toto_mtd->priv = this;
141 toto_mtd->owner = THIS_MODULE;
142
143 /* Set address of NAND IO lines */
144 this->IO_ADDR_R = toto_io_base;
145 this->IO_ADDR_W = toto_io_base;
146 this->cmd_ctrl = toto_hwcontrol;
147 this->dev_ready = NULL;
148 /* 25 us command delay time */
149 this->chip_delay = 30;
150 this->ecc.mode = NAND_ECC_SOFT;
151
152 /* Scan to find existance of the device */
153 if (nand_scan(toto_mtd, 1)) {
154 err = -ENXIO;
155 goto out_mtd;
156 }
157
158 /* Register the partitions */
159 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");
168 err = -ENXIO;
169 goto out_buf;
170 }
171 }
172
173 gpioreserve(NAND_MASK); /* claim our gpios */
174 archflashwp(0, 0); /* open up flash for writing */
175
176 goto out;
177
178 out_mtd:
179 kfree(toto_mtd);
180 out:
181 return err;
182 }
183
184 module_init(toto_init);
185
186 /*
187 * Clean up routine
188 */
189 static void __exit toto_cleanup(void)
190 {
191 /* Release resources, unregister device */
192 nand_release(toto_mtd);
193
194 /* Free the MTD device structure */
195 kfree(toto_mtd);
196
197 /* stop flash writes */
198 archflashwp(0, 1);
199
200 /* release gpios to system */
201 gpiorelease(NAND_MASK);
202 }
203
204 module_exit(toto_cleanup);
205
206 MODULE_LICENSE("GPL");
207 MODULE_AUTHOR("Richard Woodruff <r-woodruff2@ti.com>");
208 MODULE_DESCRIPTION("Glue layer for NAND flash on toto board");
209
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