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
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
|
/*
* Copyright (C) 2004 Richard Purdie
* Copyright (C) 2008 Dmitry Baryshkov
*
* Based on Sharp's NAND driver sharp_sl.c
*
* 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.
*
*/
#include <linux/genhd.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/rawnand.h>
#include <linux/mtd/nand_ecc.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/sharpsl.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/io.h>
struct sharpsl_nand {
struct nand_chip chip;
void __iomem *io;
};
static inline struct sharpsl_nand *mtd_to_sharpsl(struct mtd_info *mtd)
{
return container_of(mtd_to_nand(mtd), struct sharpsl_nand, chip);
}
/* register offset */
#define ECCLPLB 0x00 /* line parity 7 - 0 bit */
#define ECCLPUB 0x04 /* line parity 15 - 8 bit */
#define ECCCP 0x08 /* column parity 5 - 0 bit */
#define ECCCNTR 0x0C /* ECC byte counter */
#define ECCCLRR 0x10 /* cleare ECC */
#define FLASHIO 0x14 /* Flash I/O */
#define FLASHCTL 0x18 /* Flash Control */
/* Flash control bit */
#define FLRYBY (1 << 5)
#define FLCE1 (1 << 4)
#define FLWP (1 << 3)
#define FLALE (1 << 2)
#define FLCLE (1 << 1)
#define FLCE0 (1 << 0)
/*
* hardware specific access to control-lines
* ctrl:
* NAND_CNE: bit 0 -> ! bit 0 & 4
* NAND_CLE: bit 1 -> bit 1
* NAND_ALE: bit 2 -> bit 2
*
*/
static void sharpsl_nand_hwcontrol(struct mtd_info *mtd, int cmd,
unsigned int ctrl)
{
struct sharpsl_nand *sharpsl = mtd_to_sharpsl(mtd);
struct nand_chip *chip = mtd_to_nand(mtd);
if (ctrl & NAND_CTRL_CHANGE) {
unsigned char bits = ctrl & 0x07;
bits |= (ctrl & 0x01) << 4;
bits ^= 0x11;
writeb((readb(sharpsl->io + FLASHCTL) & ~0x17) | bits, sharpsl->io + FLASHCTL);
}
if (cmd != NAND_CMD_NONE)
writeb(cmd, chip->IO_ADDR_W);
}
static int sharpsl_nand_dev_ready(struct mtd_info *mtd)
{
struct sharpsl_nand *sharpsl = mtd_to_sharpsl(mtd);
return !((readb(sharpsl->io + FLASHCTL) & FLRYBY) == 0);
}
static void sharpsl_nand_enable_hwecc(struct mtd_info *mtd, int mode)
{
struct sharpsl_nand *sharpsl = mtd_to_sharpsl(mtd);
writeb(0, sharpsl->io + ECCCLRR);
}
static int sharpsl_nand_calculate_ecc(struct mtd_info *mtd, const u_char * dat, u_char * ecc_code)
{
struct sharpsl_nand *sharpsl = mtd_to_sharpsl(mtd);
ecc_code[0] = ~readb(sharpsl->io + ECCLPUB);
ecc_code[1] = ~readb(sharpsl->io + ECCLPLB);
ecc_code[2] = (~readb(sharpsl->io + ECCCP) << 2) | 0x03;
return readb(sharpsl->io + ECCCNTR) != 0;
}
/*
* Main initialization routine
*/
static int sharpsl_nand_probe(struct platform_device *pdev)
{
struct nand_chip *this;
struct mtd_info *mtd;
struct resource *r;
int err = 0;
struct sharpsl_nand *sharpsl;
struct sharpsl_nand_platform_data *data = dev_get_platdata(&pdev->dev);
if (!data) {
dev_err(&pdev->dev, "no platform data!\n");
return -EINVAL;
}
/* Allocate memory for MTD device structure and private data */
sharpsl = kzalloc(sizeof(struct sharpsl_nand), GFP_KERNEL);
if (!sharpsl)
return -ENOMEM;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r) {
dev_err(&pdev->dev, "no io memory resource defined!\n");
err = -ENODEV;
goto err_get_res;
}
/* map physical address */
sharpsl->io = ioremap(r->start, resource_size(r));
if (!sharpsl->io) {
dev_err(&pdev->dev, "ioremap to access Sharp SL NAND chip failed\n");
err = -EIO;
goto err_ioremap;
}
/* Get pointer to private data */
this = (struct nand_chip *)(&sharpsl->chip);
/* Link the private data with the MTD structure */
mtd = nand_to_mtd(this);
mtd->dev.parent = &pdev->dev;
mtd_set_ooblayout(mtd, data->ecc_layout);
platform_set_drvdata(pdev, sharpsl);
/*
* PXA initialize
*/
writeb(readb(sharpsl->io + FLASHCTL) | FLWP, sharpsl->io + FLASHCTL);
/* Set address of NAND IO lines */
this->IO_ADDR_R = sharpsl->io + FLASHIO;
this->IO_ADDR_W = sharpsl->io + FLASHIO;
/* Set address of hardware control function */
this->cmd_ctrl = sharpsl_nand_hwcontrol;
this->dev_ready = sharpsl_nand_dev_ready;
/* 15 us command delay time */
this->chip_delay = 15;
/* set eccmode using hardware ECC */
this->ecc.mode = NAND_ECC_HW;
this->ecc.size = 256;
this->ecc.bytes = 3;
this->ecc.strength = 1;
this->badblock_pattern = data->badblock_pattern;
this->ecc.hwctl = sharpsl_nand_enable_hwecc;
this->ecc.calculate = sharpsl_nand_calculate_ecc;
this->ecc.correct = nand_correct_data;
/* Scan to find existence of the device */
err = nand_scan(this, 1);
if (err)
goto err_scan;
/* Register the partitions */
mtd->name = "sharpsl-nand";
err = mtd_device_parse_register(mtd, data->part_parsers, NULL,
data->partitions, data->nr_partitions);
if (err)
goto err_add;
/* Return happy */
return 0;
err_add:
nand_cleanup(this);
err_scan:
iounmap(sharpsl->io);
err_ioremap:
err_get_res:
kfree(sharpsl);
return err;
}
/*
* Clean up routine
*/
static int sharpsl_nand_remove(struct platform_device *pdev)
{
struct sharpsl_nand *sharpsl = platform_get_drvdata(pdev);
/* Release resources, unregister device */
nand_release(&sharpsl->chip);
iounmap(sharpsl->io);
/* Free the MTD device structure */
kfree(sharpsl);
return 0;
}
static struct platform_driver sharpsl_nand_driver = {
.driver = {
.name = "sharpsl-nand",
},
.probe = sharpsl_nand_probe,
.remove = sharpsl_nand_remove,
};
module_platform_driver(sharpsl_nand_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
MODULE_DESCRIPTION("Device specific logic for NAND flash on Sharp SL-C7xx Series");
|
