1 /*
2 * drivers/mtd/nand/edb7312.c
3 *
4 * Copyright (C) 2002 Marius Gröger (mag@sysgo.de)
5 *
6 * Derived from drivers/mtd/nand/autcpu12.c
7 * Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 * Overview:
14 * This is a device driver for the NAND flash device found on the
15 * CLEP7312 board which utilizes the Toshiba TC58V64AFT part. This is
16 * a 64Mibit (8MiB x 8 bits) NAND flash device.
17 */
18
19 #include <linux/slab.h>
20 #include <linux/module.h>
21 #include <linux/init.h>
22 #include <linux/mtd/mtd.h>
23 #include <linux/mtd/nand.h>
24 #include <linux/mtd/partitions.h>
25 #include <asm/io.h>
26 #include <mach/hardware.h> /* for CLPS7111_VIRT_BASE */
27 #include <asm/sizes.h>
28 #include <asm/hardware/clps7111.h>
29
30 /*
31 * MTD structure for EDB7312 board
32 */
33 static struct mtd_info *ep7312_mtd = NULL;
34
35 /*
36 * Values specific to the EDB7312 board (used with EP7312 processor)
37 */
38 #define EP7312_FIO_PBASE 0x10000000 /* Phys address of flash */
39 #define EP7312_PXDR 0x0001 /*
40 * IO offset to Port B data register
41 * where the CLE, ALE and NCE pins
42 * are wired to.
43 */
44 #define EP7312_PXDDR 0x0041 /*
45 * IO offset to Port B data direction
46 * register so we can control the IO
47 * lines.
48 */
49
50 /*
51 * Module stuff
52 */
53
54 static unsigned long ep7312_fio_pbase = EP7312_FIO_PBASE;
55 static void __iomem *ep7312_pxdr = (void __iomem *)EP7312_PXDR;
56 static void __iomem *ep7312_pxddr = (void __iomem *)EP7312_PXDDR;
57
58 #ifdef CONFIG_MTD_PARTITIONS
59 /*
60 * Define static partitions for flash device
61 */
62 static struct mtd_partition partition_info[] = {
63 {.name = "EP7312 Nand Flash",
64 .offset = 0,
65 .size = 8 * 1024 * 1024}
66 };
67
68 #define NUM_PARTITIONS 1
69
70 #endif
71
72 /*
73 * hardware specific access to control-lines
74 *
75 * NAND_NCE: bit 0 -> bit 6 (bit 7 = 1)
76 * NAND_CLE: bit 1 -> bit 4
77 * NAND_ALE: bit 2 -> bit 5
78 */
ep7312_hwcontrol(struct mtd_info * mtd,int cmd,unsigned int ctrl)79 static void ep7312_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
80 {
81 struct nand_chip *chip = mtd->priv;
82
83 if (ctrl & NAND_CTRL_CHANGE) {
84 unsigned char bits = 0x80;
85
86 bits |= (ctrl & (NAND_CLE | NAND_ALE)) << 3;
87 bits |= (ctrl & NAND_NCE) ? 0x00 : 0x40;
88
89 clps_writeb((clps_readb(ep7312_pxdr) & 0xF0) | bits,
90 ep7312_pxdr);
91 }
92 if (cmd != NAND_CMD_NONE)
93 writeb(cmd, chip->IO_ADDR_W);
94 }
95
96 /*
97 * read device ready pin
98 */
ep7312_device_ready(struct mtd_info * mtd)99 static int ep7312_device_ready(struct mtd_info *mtd)
100 {
101 return 1;
102 }
103
104 #ifdef CONFIG_MTD_PARTITIONS
105 const char *part_probes[] = { "cmdlinepart", NULL };
106 #endif
107
108 /*
109 * Main initialization routine
110 */
ep7312_init(void)111 static int __init ep7312_init(void)
112 {
113 struct nand_chip *this;
114 const char *part_type = 0;
115 int mtd_parts_nb = 0;
116 struct mtd_partition *mtd_parts = 0;
117 void __iomem *ep7312_fio_base;
118
119 /* Allocate memory for MTD device structure and private data */
120 ep7312_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
121 if (!ep7312_mtd) {
122 printk("Unable to allocate EDB7312 NAND MTD device structure.\n");
123 return -ENOMEM;
124 }
125
126 /* map physical address */
127 ep7312_fio_base = ioremap(ep7312_fio_pbase, SZ_1K);
128 if (!ep7312_fio_base) {
129 printk("ioremap EDB7312 NAND flash failed\n");
130 kfree(ep7312_mtd);
131 return -EIO;
132 }
133
134 /* Get pointer to private data */
135 this = (struct nand_chip *)(&ep7312_mtd[1]);
136
137 /* Initialize structures */
138 memset(ep7312_mtd, 0, sizeof(struct mtd_info));
139 memset(this, 0, sizeof(struct nand_chip));
140
141 /* Link the private data with the MTD structure */
142 ep7312_mtd->priv = this;
143 ep7312_mtd->owner = THIS_MODULE;
144
145 /*
146 * Set GPIO Port B control register so that the pins are configured
147 * to be outputs for controlling the NAND flash.
148 */
149 clps_writeb(0xf0, ep7312_pxddr);
150
151 /* insert callbacks */
152 this->IO_ADDR_R = ep7312_fio_base;
153 this->IO_ADDR_W = ep7312_fio_base;
154 this->cmd_ctrl = ep7312_hwcontrol;
155 this->dev_ready = ep7312_device_ready;
156 /* 15 us command delay time */
157 this->chip_delay = 15;
158
159 /* Scan to find existence of the device */
160 if (nand_scan(ep7312_mtd, 1)) {
161 iounmap((void *)ep7312_fio_base);
162 kfree(ep7312_mtd);
163 return -ENXIO;
164 }
165 #ifdef CONFIG_MTD_PARTITIONS
166 ep7312_mtd->name = "edb7312-nand";
167 mtd_parts_nb = parse_mtd_partitions(ep7312_mtd, part_probes, &mtd_parts, 0);
168 if (mtd_parts_nb > 0)
169 part_type = "command line";
170 else
171 mtd_parts_nb = 0;
172 #endif
173 if (mtd_parts_nb == 0) {
174 mtd_parts = partition_info;
175 mtd_parts_nb = NUM_PARTITIONS;
176 part_type = "static";
177 }
178
179 /* Register the partitions */
180 printk(KERN_NOTICE "Using %s partition definition\n", part_type);
181 add_mtd_partitions(ep7312_mtd, mtd_parts, mtd_parts_nb);
182
183 /* Return happy */
184 return 0;
185 }
186
187 module_init(ep7312_init);
188
189 /*
190 * Clean up routine
191 */
ep7312_cleanup(void)192 static void __exit ep7312_cleanup(void)
193 {
194 struct nand_chip *this = (struct nand_chip *)&ep7312_mtd[1];
195
196 /* Release resources, unregister device */
197 nand_release(ap7312_mtd);
198
199 /* Release io resource */
200 iounmap(this->IO_ADDR_R);
201
202 /* Free the MTD device structure */
203 kfree(ep7312_mtd);
204 }
205
206 module_exit(ep7312_cleanup);
207
208 MODULE_LICENSE("GPL");
209 MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");
210 MODULE_DESCRIPTION("MTD map driver for Cogent EDB7312 board");
211