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
* 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.
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.
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>
26
#include <mach/hardware.h> /* for CLPS7111_VIRT_BASE */
27
#include <asm/sizes.h>
28
#include <asm/hardware/clps7111.h>
31
* MTD structure for EDB7312 board
33
static struct mtd_info *ep7312_mtd = NULL;
36
* Values specific to the EDB7312 board (used with EP7312 processor)
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
44
#define EP7312_PXDDR 0x0041 /*
45
* IO offset to Port B data direction
46
* register so we can control the IO
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;
59
* Define static partitions for flash device
61
static struct mtd_partition partition_info[] = {
62
{.name = "EP7312 Nand Flash",
64
.size = 8 * 1024 * 1024}
67
#define NUM_PARTITIONS 1
70
* hardware specific access to control-lines
72
* NAND_NCE: bit 0 -> bit 6 (bit 7 = 1)
73
* NAND_CLE: bit 1 -> bit 4
74
* NAND_ALE: bit 2 -> bit 5
76
static void ep7312_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
78
struct nand_chip *chip = mtd->priv;
80
if (ctrl & NAND_CTRL_CHANGE) {
81
unsigned char bits = 0x80;
83
bits |= (ctrl & (NAND_CLE | NAND_ALE)) << 3;
84
bits |= (ctrl & NAND_NCE) ? 0x00 : 0x40;
86
clps_writeb((clps_readb(ep7312_pxdr) & 0xF0) | bits,
89
if (cmd != NAND_CMD_NONE)
90
writeb(cmd, chip->IO_ADDR_W);
94
* read device ready pin
96
static int ep7312_device_ready(struct mtd_info *mtd)
101
const char *part_probes[] = { "cmdlinepart", NULL };
104
* Main initialization routine
106
static int __init ep7312_init(void)
108
struct nand_chip *this;
109
const char *part_type = 0;
110
int mtd_parts_nb = 0;
111
struct mtd_partition *mtd_parts = 0;
112
void __iomem *ep7312_fio_base;
114
/* Allocate memory for MTD device structure and private data */
115
ep7312_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
117
printk("Unable to allocate EDB7312 NAND MTD device structure.\n");
121
/* map physical address */
122
ep7312_fio_base = ioremap(ep7312_fio_pbase, SZ_1K);
123
if (!ep7312_fio_base) {
124
printk("ioremap EDB7312 NAND flash failed\n");
129
/* Get pointer to private data */
130
this = (struct nand_chip *)(&ep7312_mtd[1]);
132
/* Initialize structures */
133
memset(ep7312_mtd, 0, sizeof(struct mtd_info));
134
memset(this, 0, sizeof(struct nand_chip));
136
/* Link the private data with the MTD structure */
137
ep7312_mtd->priv = this;
138
ep7312_mtd->owner = THIS_MODULE;
141
* Set GPIO Port B control register so that the pins are configured
142
* to be outputs for controlling the NAND flash.
144
clps_writeb(0xf0, ep7312_pxddr);
146
/* insert callbacks */
147
this->IO_ADDR_R = ep7312_fio_base;
148
this->IO_ADDR_W = ep7312_fio_base;
149
this->cmd_ctrl = ep7312_hwcontrol;
150
this->dev_ready = ep7312_device_ready;
151
/* 15 us command delay time */
152
this->chip_delay = 15;
154
/* Scan to find existence of the device */
155
if (nand_scan(ep7312_mtd, 1)) {
156
iounmap((void *)ep7312_fio_base);
160
ep7312_mtd->name = "edb7312-nand";
161
mtd_parts_nb = parse_mtd_partitions(ep7312_mtd, part_probes, &mtd_parts, 0);
162
if (mtd_parts_nb > 0)
163
part_type = "command line";
166
if (mtd_parts_nb == 0) {
167
mtd_parts = partition_info;
168
mtd_parts_nb = NUM_PARTITIONS;
169
part_type = "static";
172
/* Register the partitions */
173
printk(KERN_NOTICE "Using %s partition definition\n", part_type);
174
mtd_device_register(ep7312_mtd, mtd_parts, mtd_parts_nb);
180
module_init(ep7312_init);
185
static void __exit ep7312_cleanup(void)
187
struct nand_chip *this = (struct nand_chip *)&ep7312_mtd[1];
189
/* Release resources, unregister device */
190
nand_release(ap7312_mtd);
192
/* Release io resource */
193
iounmap(this->IO_ADDR_R);
195
/* Free the MTD device structure */
199
module_exit(ep7312_cleanup);
201
MODULE_LICENSE("GPL");
202
MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");
203
MODULE_DESCRIPTION("MTD map driver for Cogent EDB7312 board");