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
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
/*==============================================================================*/
/* rbmipsnand.c */
/* This module is derived from the 2.4 driver shipped by Microtik for their */
/* Routerboard 1xx and 5xx series boards. It provides support for the built in */
/* NAND flash on the Routerboard 1xx series boards for Linux 2.6.19+. */
/* Licence: Original Microtik code seems not to have a licence. */
/* Rewritten code all GPL V2. */
/* Copyright(C) 2007 david.goodenough@linkchoose.co.uk (for rewriten code) */
/*==============================================================================*/
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/bootinfo.h>
#include <asm/mach-adm5120/adm5120_info.h>
#include <asm/mach-adm5120/adm5120_defs.h>
#define SMEM1(x) (*((volatile unsigned char *) (KSEG1ADDR(ADM5120_SRAM1_BASE) + x)))
#define NAND_RW_REG 0x0 //data register
#define NAND_SET_CEn 0x1 //CE# low
#define NAND_CLR_CEn 0x2 //CE# high
#define NAND_CLR_CLE 0x3 //CLE low
#define NAND_SET_CLE 0x4 //CLE high
#define NAND_CLR_ALE 0x5 //ALE low
#define NAND_SET_ALE 0x6 //ALE high
#define NAND_SET_SPn 0x7 //SP# low (use spare area)
#define NAND_CLR_SPn 0x8 //SP# high (do not use spare area)
#define NAND_SET_WPn 0x9 //WP# low
#define NAND_CLR_WPn 0xA //WP# high
#define NAND_STS_REG 0xB //Status register
#define MEM32(x) *((volatile unsigned *) (x))
static struct mtd_partition partition_info[] = {
{
name: "RouterBoard NAND Boot",
offset: 0,
size: 4 * 1024 * 1024
},
{
name: "rootfs",
offset: MTDPART_OFS_NXTBLK,
size: MTDPART_SIZ_FULL
}
};
static struct nand_ecclayout rb_ecclayout = {
.eccbytes = 6,
.eccpos = { 8, 9, 10, 13, 14, 15 },
.oobavail = 9,
.oobfree = { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1} }
};
struct adm5120_nand_info {
struct nand_chip chip;
struct mtd_info mtd;
void __iomem *io_base;
#ifdef CONFIG_MTD_PARTITIONS
int nr_parts;
struct mtd_partition *parts;
#endif
unsigned int init_ok;
};
static int rb100_dev_ready(struct mtd_info *mtd)
{
return SMEM1(NAND_STS_REG) & 0x80;
}
static void rbmips_hwcontrol100(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
struct nand_chip *chip = mtd->priv;
if (ctrl & NAND_CTRL_CHANGE)
{
SMEM1((( ctrl & NAND_CLE) ? NAND_SET_CLE : NAND_CLR_CLE)) = 0x01;
SMEM1((( ctrl & NAND_ALE) ? NAND_SET_ALE : NAND_CLR_ALE)) = 0x01;
SMEM1((( ctrl & NAND_NCE) ? NAND_SET_CEn : NAND_CLR_CEn)) = 0x01;
}
if (cmd != NAND_CMD_NONE)
writeb( cmd, chip->IO_ADDR_W);
}
/*========================================================================*/
/* We need to use the OLD Yaffs-1 OOB layout, otherwise the RB bootloader */
/* will not be able to find the kernel that we load. So set the oobinfo */
/* when creating the partitions. */
/*========================================================================*/
unsigned get_rbnand_block_size(struct adm5120_nand_info *data)
{
return data->init_ok ? data->mtd.writesize : 0;
}
EXPORT_SYMBOL(get_rbnand_block_size);
static int rbmips_probe(struct platform_device *pdev)
{
struct adm5120_nand_info *data;
int res = 0;
/* Allocate memory for the nand_chip structure */
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data) {
dev_err(&pdev->dev, "Failed to allocate device structure\n");
return -ENOMEM;
}
data->io_base = ioremap(pdev->resource[0].start, pdev->resource[0].end - pdev->resource[0].start + 1);
if (data->io_base == NULL) {
dev_err(&pdev->dev, "ioremap failed\n");
kfree(data);
return -EIO;
}
MEM32(0xB2000064) = 0x100;
MEM32(0xB2000008) = 0x1;
SMEM1(NAND_SET_SPn) = 0x01;
SMEM1(NAND_CLR_WPn) = 0x01;
data->chip.priv = &data;
data->mtd.priv = &data->chip;
data->mtd.owner = THIS_MODULE;
data->init_ok = 0;
data->chip.IO_ADDR_R = (unsigned char *)KSEG1ADDR(ADM5120_SRAM1_BASE);
data->chip.IO_ADDR_W = data->chip.IO_ADDR_R;
data->chip.cmd_ctrl = rbmips_hwcontrol100;
data->chip.dev_ready = rb100_dev_ready;
data->chip.ecc.mode = NAND_ECC_SOFT;
data->chip.ecc.layout = &rb_ecclayout;
data->chip.chip_delay = 25;
data->chip.options |= NAND_NO_AUTOINCR;
platform_set_drvdata(pdev, data);
/* Why do we need to scan 4 times ? */
if (nand_scan(&data->mtd, 1) && nand_scan(&data->mtd, 1) && nand_scan(&data->mtd, 1) && nand_scan(&data->mtd, 1)) {
printk(KERN_INFO "RB1xxx nand device not found\n");
res = -ENXIO;
goto out;
}
add_mtd_partitions(&data->mtd, partition_info, 2);
data->init_ok = 1;
res = add_mtd_device(&data->mtd);
if (!res)
return res;
nand_release(&data->mtd);
out:
platform_set_drvdata(pdev, NULL);
iounmap(data->io_base);
kfree(data);
return res;
}
static int __devexit rbmips_remove(struct platform_device *pdev)
{
struct adm5120_nand_info *data = platform_get_drvdata(pdev);
nand_release(&data->mtd);
iounmap(data->io_base);
kfree(data);
return 0;
}
static struct platform_driver adm5120_nand_driver = {
.probe = rbmips_probe,
.remove = rbmips_remove,
.driver = {
.name = "adm5120-nand",
.owner = THIS_MODULE,
},
};
static int __init adm5120_nand_init(void)
{
int err;
err = platform_driver_register(&adm5120_nand_driver);
return err;
}
static void __exit adm5120_nand_exit(void)
{
platform_driver_unregister(&adm5120_nand_driver);
}
module_init(adm5120_nand_init);
module_exit(adm5120_nand_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Goodenough, Florian Fainelli");
MODULE_DESCRIPTION("RouterBOARD 100 NAND driver");
|
