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 1.4 2004/10/05 13:50:20 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 /*
36 * MTD structure for TOTO board
37 */
38 static struct mtd_info *toto_mtd = NULL;
39
40 static unsigned long toto_io_base = OMAP_FLASH_1_BASE;
41
42 #define CONFIG_NAND_WORKAROUND 1
43
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)
48
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)
54 #else
55 #define T_NAND_CTL_CLRCLE(iob) gpiosetout(NAND_CLE, 0)
56 #define T_NAND_CTL_SETCLE(iob) gpiosetout(NAND_CLE, NAND_CLE)
57 #endif
58 #define T_NAND_CTL_SETNCE(iob) gpiosetout(NAND_NCE, 0)
59 #define T_NAND_CTL_CLRNCE(iob) gpiosetout(NAND_NCE, NAND_NCE)
60
61 /*
62 * Define partitions for flash devices
63 */
64
65 static struct mtd_partition partition_info64M[] = {
66 { .name = "toto kernel partition 1",
67 .offset = 0,
68 .size = 2 * SZ_1M },
69 { .name = "toto file sys partition 2",
70 .offset = 2 * SZ_1M,
71 .size = 14 * SZ_1M },
72 { .name = "toto user partition 3",
73 .offset = 16 * SZ_1M,
74 .size = 16 * SZ_1M },
75 { .name = "toto devboard extra partition 4",
76 .offset = 32 * SZ_1M,
77 .size = 32 * SZ_1M },
78 };
79
80 static struct mtd_partition partition_info32M[] = {
81 { .name = "toto kernel partition 1",
82 .offset = 0,
83 .size = 2 * SZ_1M },
84 { .name = "toto file sys partition 2",
85 .offset = 2 * SZ_1M,
86 .size = 14 * SZ_1M },
87 { .name = "toto user partition 3",
88 .offset = 16 * SZ_1M,
89 .size = 16 * SZ_1M },
90 };
91
92 #define NUM_PARTITIONS32M 3
93 #define NUM_PARTITIONS64M 4
94 /*
95 * hardware specific access to control-lines
96 */
97
98 static void toto_hwcontrol(struct mtd_info *mtd, int cmd)
99 {
100
101 udelay(1); /* hopefully enough time for tc make proceding write to clear */
102 switch(cmd){
103
104 case NAND_CTL_SETCLE: T_NAND_CTL_SETCLE(cmd); break;
105 case NAND_CTL_CLRCLE: T_NAND_CTL_CLRCLE(cmd); break;
106
107 case NAND_CTL_SETALE: T_NAND_CTL_SETALE(cmd); break;
108 case NAND_CTL_CLRALE: T_NAND_CTL_CLRALE(cmd); break;
109
110 case NAND_CTL_SETNCE: T_NAND_CTL_SETNCE(cmd); break;
111 case NAND_CTL_CLRNCE: T_NAND_CTL_CLRNCE(cmd); break;
112 }
113 udelay(1); /* allow time to ensure gpio state to over take memory write */
114 }
115
116 /*
117 * Main initialization routine
118 */
119 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),
126 GFP_KERNEL);
127 if (!toto_mtd) {
128 printk (KERN_WARNING "Unable to allocate toto NAND MTD device structure.\n");
129 err = -ENOMEM;
130 goto out;
131 }
132
133 /* Get pointer to private data */
134 this = (struct nand_chip *) (&toto_mtd[1]);
135
136 /* Initialize structures */
137 memset((char *) toto_mtd, 0, sizeof(struct mtd_info));
138 memset((char *) this, 0, sizeof(struct nand_chip));
139
140 /* Link the private data with the MTD structure */
141 toto_mtd->priv = this;
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->hwcontrol = toto_hwcontrol;
147 this->dev_ready = NULL;
148 /* 25 us command delay time */
149 this->chip_delay = 30;
150 this->eccmode = 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: add_mtd_partitions(toto_mtd, partition_info64M, NUM_PARTITIONS64M); break;
161 case SZ_32M: add_mtd_partitions(toto_mtd, partition_info32M, NUM_PARTITIONS32M); break;
162 default: {
163 printk (KERN_WARNING "Unsupported Nand device\n");
164 err = -ENXIO;
165 goto out_buf;
166 }
167 }
168
169 gpioreserve(NAND_MASK); /* claim our gpios */
170 archflashwp(0,0); /* open up flash for writing */
171
172 goto out;
173
174 out_buf:
175 kfree (this->data_buf);
176 out_mtd:
177 kfree (toto_mtd);
178 out:
179 return err;
180 }
181
182 module_init(toto_init);
183
184 /*
185 * Clean up routine
186 */
187 static void __exit toto_cleanup (void)
188 {
189 /* Release resources, unregister device */
190 nand_release (toto_mtd);
191
192 /* Free the MTD device structure */
193 kfree (toto_mtd);
194
195 /* stop flash writes */
196 archflashwp(0,1);
197
198 /* release gpios to system */
199 gpiorelease(NAND_MASK);
200 }
201 module_exit(toto_cleanup);
202
203 MODULE_LICENSE("GPL");
204 MODULE_AUTHOR("Richard Woodruff <r-woodruff2@ti.com>");
205 MODULE_DESCRIPTION("Glue layer for NAND flash on toto board");
206
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