1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
/*
* drivers/mtd/nand/spia.c
*
* Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)
*
*
* 10-29-2001 TG change to support hardwarespecific access
* to controllines (due to change in nand.c)
* page_cache added
*
* $Id: spia.c,v 1.25 2005/11/07 11:14:31 gleixner Exp $
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Overview:
* This is a device driver for the NAND flash device found on the
* SPIA board which utilizes the Toshiba TC58V64AFT part. This is
* a 64Mibit (8MiB x 8 bits) NAND flash device.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <asm/io.h>
/*
* MTD structure for SPIA board
*/
static struct mtd_info *spia_mtd = NULL;
/*
* Values specific to the SPIA board (used with EP7212 processor)
*/
#define SPIA_IO_BASE 0xd0000000 /* Start of EP7212 IO address space */
#define SPIA_FIO_BASE 0xf0000000 /* Address where flash is mapped */
#define SPIA_PEDR 0x0080 /*
* IO offset to Port E data register
* where the CLE, ALE and NCE pins
* are wired to.
*/
#define SPIA_PEDDR 0x00c0 /*
* IO offset to Port E data direction
* register so we can control the IO
* lines.
*/
/*
* Module stuff
*/
static int spia_io_base = SPIA_IO_BASE;
static int spia_fio_base = SPIA_FIO_BASE;
static int spia_pedr = SPIA_PEDR;
static int spia_peddr = SPIA_PEDDR;
module_param(spia_io_base, int, 0);
module_param(spia_fio_base, int, 0);
module_param(spia_pedr, int, 0);
module_param(spia_peddr, int, 0);
/*
* Define partitions for flash device
*/
static const struct mtd_partition partition_info[] = {
{
.name = "SPIA flash partition 1",
.offset = 0,
.size = 2 * 1024 * 1024},
{
.name = "SPIA flash partition 2",
.offset = 2 * 1024 * 1024,
.size = 6 * 1024 * 1024}
};
#define NUM_PARTITIONS 2
/*
* hardware specific access to control-lines
*
* ctrl:
* NAND_CNE: bit 0 -> bit 2
* NAND_CLE: bit 1 -> bit 0
* NAND_ALE: bit 2 -> bit 1
*/
static void spia_hwcontrol(struct mtd_info *mtd, int cmd)
{
struct nand_chip *chip = mtd->priv;
if (ctrl & NAND_CTRL_CHANGE) {
void __iomem *addr = spia_io_base + spia_pedr;
unsigned char bits;
bits = (ctrl & NAND_CNE) << 2;
bits |= (ctrl & NAND_CLE | NAND_ALE) >> 1;
writeb((readb(addr) & ~0x7) | bits, addr);
}
if (cmd != NAND_CMD_NONE)
writeb(cmd, chip->IO_ADDR_W);
}
/*
* Main initialization routine
*/
static int __init spia_init(void)
{
struct nand_chip *this;
/* Allocate memory for MTD device structure and private data */
spia_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
if (!spia_mtd) {
printk("Unable to allocate SPIA NAND MTD device structure.\n");
return -ENOMEM;
}
/* Get pointer to private data */
this = (struct nand_chip *)(&spia_mtd[1]);
/* Initialize structures */
memset(spia_mtd, 0, sizeof(struct mtd_info));
memset(this, 0, sizeof(struct nand_chip));
/* Link the private data with the MTD structure */
spia_mtd->priv = this;
spia_mtd->owner = THIS_MODULE;
/*
* Set GPIO Port E control register so that the pins are configured
* to be outputs for controlling the NAND flash.
*/
(*(volatile unsigned char *)(spia_io_base + spia_peddr)) = 0x07;
/* Set address of NAND IO lines */
this->IO_ADDR_R = (void __iomem *)spia_fio_base;
this->IO_ADDR_W = (void __iomem *)spia_fio_base;
/* Set address of hardware control function */
this->cmd_ctrl = spia_hwcontrol;
/* 15 us command delay time */
this->chip_delay = 15;
/* Scan to find existence of the device */
if (nand_scan(spia_mtd, 1)) {
kfree(spia_mtd);
return -ENXIO;
}
/* Register the partitions */
add_mtd_partitions(spia_mtd, partition_info, NUM_PARTITIONS);
/* Return happy */
return 0;
}
module_init(spia_init);
/*
* Clean up routine
*/
static void __exit spia_cleanup(void)
{
/* Release resources, unregister device */
nand_release(spia_mtd);
/* Free the MTD device structure */
kfree(spia_mtd);
}
module_exit(spia_cleanup);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Steven J. Hill <sjhill@realitydiluted.com");
MODULE_DESCRIPTION("Board-specific glue layer for NAND flash on SPIA board");
|
