initial commit with v2.6.9
[linux-2.6.9-moxart.git] / drivers / mtd / nand / edb7312.c
blob79779406910317b635502e982a3cc7e4f492d269
1 /*
2 * drivers/mtd/nand/edb7312.c
4 * Copyright (C) 2002 Marius Gröger (mag@sysgo.de)
6 * Derived from drivers/mtd/nand/autcpu12.c
7 * Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
9 * $Id: edb7312.c,v 1.8 2004/07/12 15:03:26 dwmw2 Exp $
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
15 * Overview:
16 * This is a device driver for the NAND flash device found on the
17 * CLEP7312 board which utilizes the Toshiba TC58V64AFT part. This is
18 * a 64Mibit (8MiB x 8 bits) NAND flash device.
21 #include <linux/slab.h>
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/mtd/mtd.h>
25 #include <linux/mtd/nand.h>
26 #include <linux/mtd/partitions.h>
27 #include <asm/io.h>
28 #include <asm/arch/hardware.h> /* for CLPS7111_VIRT_BASE */
29 #include <asm/sizes.h>
30 #include <asm/hardware/clps7111.h>
33 * MTD structure for EDB7312 board
35 static struct mtd_info *ep7312_mtd = NULL;
38 * Values specific to the EDB7312 board (used with EP7312 processor)
40 #define EP7312_FIO_PBASE 0x10000000 /* Phys address of flash */
41 #define EP7312_PXDR 0x0001 /*
42 * IO offset to Port B data register
43 * where the CLE, ALE and NCE pins
44 * are wired to.
46 #define EP7312_PXDDR 0x0041 /*
47 * IO offset to Port B data direction
48 * register so we can control the IO
49 * lines.
53 * Module stuff
56 static int ep7312_fio_pbase = EP7312_FIO_PBASE;
57 static int ep7312_pxdr = EP7312_PXDR;
58 static int ep7312_pxddr = EP7312_PXDDR;
60 #ifdef MODULE
61 MODULE_PARM(ep7312_fio_pbase, "i");
62 MODULE_PARM(ep7312_pxdr, "i");
63 MODULE_PARM(ep7312_pxddr, "i");
65 __setup("ep7312_fio_pbase=",ep7312_fio_pbase);
66 __setup("ep7312_pxdr=",ep7312_pxdr);
67 __setup("ep7312_pxddr=",ep7312_pxddr);
68 #endif
70 #ifdef CONFIG_MTD_PARTITIONS
72 * Define static partitions for flash device
74 static struct mtd_partition partition_info[] = {
75 { .name = "EP7312 Nand Flash",
76 .offset = 0,
77 .size = 8*1024*1024 }
79 #define NUM_PARTITIONS 1
81 #endif
84 /*
85 * hardware specific access to control-lines
87 static void ep7312_hwcontrol(struct mtd_info *mtd, int cmd)
89 switch(cmd) {
91 case NAND_CTL_SETCLE:
92 clps_writeb(clps_readb(ep7312_pxdr) | 0x10, ep7312_pxdr);
93 break;
94 case NAND_CTL_CLRCLE:
95 clps_writeb(clps_readb(ep7312_pxdr) & ~0x10, ep7312_pxdr);
96 break;
98 case NAND_CTL_SETALE:
99 clps_writeb(clps_readb(ep7312_pxdr) | 0x20, ep7312_pxdr);
100 break;
101 case NAND_CTL_CLRALE:
102 clps_writeb(clps_readb(ep7312_pxdr) & ~0x20, ep7312_pxdr);
103 break;
105 case NAND_CTL_SETNCE:
106 clps_writeb((clps_readb(ep7312_pxdr) | 0x80) & ~0x40, ep7312_pxdr);
107 break;
108 case NAND_CTL_CLRNCE:
109 clps_writeb((clps_readb(ep7312_pxdr) | 0x80) | 0x40, ep7312_pxdr);
110 break;
115 * read device ready pin
117 static int ep7312_device_ready(struct mtd_info *mtd)
119 return 1;
121 #ifdef CONFIG_MTD_PARTITIONS
122 const char *part_probes[] = { "cmdlinepart", NULL };
123 #endif
126 * Main initialization routine
128 static int __init ep7312_init (void)
130 struct nand_chip *this;
131 const char *part_type = 0;
132 int mtd_parts_nb = 0;
133 struct mtd_partition *mtd_parts = 0;
134 int ep7312_fio_base;
136 /* Allocate memory for MTD device structure and private data */
137 ep7312_mtd = kmalloc(sizeof(struct mtd_info) +
138 sizeof(struct nand_chip),
139 GFP_KERNEL);
140 if (!ep7312_mtd) {
141 printk("Unable to allocate EDB7312 NAND MTD device structure.\n");
142 return -ENOMEM;
145 /* map physical adress */
146 ep7312_fio_base = (unsigned long)ioremap(ep7312_fio_pbase, SZ_1K);
147 if(!ep7312_fio_base) {
148 printk("ioremap EDB7312 NAND flash failed\n");
149 kfree(ep7312_mtd);
150 return -EIO;
153 /* Get pointer to private data */
154 this = (struct nand_chip *) (&ep7312_mtd[1]);
156 /* Initialize structures */
157 memset((char *) ep7312_mtd, 0, sizeof(struct mtd_info));
158 memset((char *) this, 0, sizeof(struct nand_chip));
160 /* Link the private data with the MTD structure */
161 ep7312_mtd->priv = this;
164 * Set GPIO Port B control register so that the pins are configured
165 * to be outputs for controlling the NAND flash.
167 clps_writeb(0xf0, ep7312_pxddr);
169 /* insert callbacks */
170 this->IO_ADDR_R = ep7312_fio_base;
171 this->IO_ADDR_W = ep7312_fio_base;
172 this->hwcontrol = ep7312_hwcontrol;
173 this->dev_ready = ep7312_device_ready;
174 /* 15 us command delay time */
175 this->chip_delay = 15;
177 /* Scan to find existence of the device */
178 if (nand_scan (ep7312_mtd, 1)) {
179 iounmap((void *)ep7312_fio_base);
180 kfree (ep7312_mtd);
181 return -ENXIO;
184 /* Allocate memory for internal data buffer */
185 this->data_buf = kmalloc (sizeof(u_char) * (ep7312_mtd->oobblock + ep7312_mtd->oobsize), GFP_KERNEL);
186 if (!this->data_buf) {
187 printk("Unable to allocate NAND data buffer for EDB7312.\n");
188 iounmap((void *)ep7312_fio_base);
189 kfree (ep7312_mtd);
190 return -ENOMEM;
193 #ifdef CONFIG_PARTITIONS
194 ep7312_mtd->name = "edb7312-nand";
195 mtd_parts_nb = parse_mtd_partitions(ep7312_mtd, part_probes,
196 &mtd_parts, 0);
197 if (mtd_parts_nb > 0)
198 part_type = "command line";
199 else
200 mtd_parts_nb = 0;
201 #endif
202 if (mtd_parts_nb == 0) {
203 mtd_parts = partition_info;
204 mtd_parts_nb = NUM_PARTITIONS;
205 part_type = "static";
208 /* Register the partitions */
209 printk(KERN_NOTICE "Using %s partition definition\n", part_type);
210 add_mtd_partitions(ep7312_mtd, mtd_parts, mtd_parts_nb);
212 /* Return happy */
213 return 0;
215 module_init(ep7312_init);
218 * Clean up routine
220 static void __exit ep7312_cleanup (void)
222 struct nand_chip *this = (struct nand_chip *) &ep7312_mtd[1];
224 /* Unregister the device */
225 del_mtd_device (ep7312_mtd);
227 /* Free internal data buffer */
228 kfree (this->data_buf);
230 /* Free the MTD device structure */
231 kfree (ep7312_mtd);
233 module_exit(ep7312_cleanup);
235 MODULE_LICENSE("GPL");
236 MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");
237 MODULE_DESCRIPTION("MTD map driver for Cogent EDB7312 board");