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
|
/*
* Generic NAND driver
*
* Author: Vitaly Wool <vitalywool@gmail.com>
*
* 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/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/rawnand.h>
#include <linux/mtd/partitions.h>
struct plat_nand_data {
struct nand_chip chip;
void __iomem *io_base;
};
static void plat_nand_cmd_ctrl(struct mtd_info *mtd, int dat, unsigned int ctrl)
{
struct platform_nand_data *pdata = dev_get_platdata(mtd->dev.parent);
pdata->ctrl.cmd_ctrl(mtd_to_nand(mtd), dat, ctrl);
}
static int plat_nand_dev_ready(struct mtd_info *mtd)
{
struct platform_nand_data *pdata = dev_get_platdata(mtd->dev.parent);
return pdata->ctrl.dev_ready(mtd_to_nand(mtd));
}
/*
* Probe for the NAND device.
*/
static int plat_nand_probe(struct platform_device *pdev)
{
struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev);
struct plat_nand_data *data;
struct mtd_info *mtd;
struct resource *res;
const char **part_types;
int err = 0;
if (!pdata) {
dev_err(&pdev->dev, "platform_nand_data is missing\n");
return -EINVAL;
}
if (pdata->chip.nr_chips < 1) {
dev_err(&pdev->dev, "invalid number of chips specified\n");
return -EINVAL;
}
/* Allocate memory for the device structure (and zero it) */
data = devm_kzalloc(&pdev->dev, sizeof(struct plat_nand_data),
GFP_KERNEL);
if (!data)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
data->io_base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(data->io_base))
return PTR_ERR(data->io_base);
nand_set_flash_node(&data->chip, pdev->dev.of_node);
mtd = nand_to_mtd(&data->chip);
mtd->dev.parent = &pdev->dev;
data->chip.IO_ADDR_R = data->io_base;
data->chip.IO_ADDR_W = data->io_base;
if (pdata->ctrl.cmd_ctrl)
data->chip.cmd_ctrl = plat_nand_cmd_ctrl;
if (pdata->ctrl.dev_ready)
data->chip.dev_ready = plat_nand_dev_ready;
data->chip.select_chip = pdata->ctrl.select_chip;
data->chip.write_buf = pdata->ctrl.write_buf;
data->chip.read_buf = pdata->ctrl.read_buf;
data->chip.chip_delay = pdata->chip.chip_delay;
data->chip.options |= pdata->chip.options;
data->chip.bbt_options |= pdata->chip.bbt_options;
data->chip.ecc.mode = NAND_ECC_SOFT;
data->chip.ecc.algo = NAND_ECC_HAMMING;
platform_set_drvdata(pdev, data);
/* Handle any platform specific setup */
if (pdata->ctrl.probe) {
err = pdata->ctrl.probe(pdev);
if (err)
goto out;
}
/* Scan to find existence of the device */
err = nand_scan(&data->chip, pdata->chip.nr_chips);
if (err)
goto out;
part_types = pdata->chip.part_probe_types;
err = mtd_device_parse_register(mtd, part_types, NULL,
pdata->chip.partitions,
pdata->chip.nr_partitions);
if (!err)
return err;
nand_release(&data->chip);
out:
if (pdata->ctrl.remove)
pdata->ctrl.remove(pdev);
return err;
}
/*
* Remove a NAND device.
*/
static int plat_nand_remove(struct platform_device *pdev)
{
struct plat_nand_data *data = platform_get_drvdata(pdev);
struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev);
nand_release(&data->chip);
if (pdata->ctrl.remove)
pdata->ctrl.remove(pdev);
return 0;
}
static const struct of_device_id plat_nand_match[] = {
{ .compatible = "gen_nand" },
{},
};
MODULE_DEVICE_TABLE(of, plat_nand_match);
static struct platform_driver plat_nand_driver = {
.probe = plat_nand_probe,
.remove = plat_nand_remove,
.driver = {
.name = "gen_nand",
.of_match_table = plat_nand_match,
},
};
module_platform_driver(plat_nand_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Vitaly Wool");
MODULE_DESCRIPTION("Simple generic NAND driver");
MODULE_ALIAS("platform:gen_nand");
|
