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
|
/*
* drivers/mtd/nand/orion_nand.c
*
* NAND support for Marvell Orion SoC platforms
*
* Tzachi Perelstein <tzachi@marvell.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <asm/io.h>
#include <asm/sizes.h>
#include <mach/hardware.h>
#include <plat/orion_nand.h>
#ifdef CONFIG_MTD_CMDLINE_PARTS
static const char *part_probes[] = { "cmdlinepart", NULL };
#endif
static void orion_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
struct nand_chip *nc = mtd->priv;
struct orion_nand_data *board = nc->priv;
u32 offs;
if (cmd == NAND_CMD_NONE)
return;
if (ctrl & NAND_CLE)
offs = (1 << board->cle);
else if (ctrl & NAND_ALE)
offs = (1 << board->ale);
else
return;
if (nc->options & NAND_BUSWIDTH_16)
offs <<= 1;
writeb(cmd, nc->IO_ADDR_W + offs);
}
static void orion_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
{
struct nand_chip *chip = mtd->priv;
void __iomem *io_base = chip->IO_ADDR_R;
uint64_t *buf64;
int i = 0;
while (len && (unsigned long)buf & 7) {
*buf++ = readb(io_base);
len--;
}
buf64 = (uint64_t *)buf;
while (i < len/8) {
uint64_t x;
asm volatile ("ldrd\t%0, [%1]" : "=&r" (x) : "r" (io_base));
buf64[i++] = x;
}
i *= 8;
while (i < len)
buf[i++] = readb(io_base);
}
static int __init orion_nand_probe(struct platform_device *pdev)
{
struct mtd_info *mtd;
struct nand_chip *nc;
struct orion_nand_data *board;
void __iomem *io_base;
int ret = 0;
#ifdef CONFIG_MTD_PARTITIONS
struct mtd_partition *partitions = NULL;
int num_part = 0;
#endif
nc = kzalloc(sizeof(struct nand_chip) + sizeof(struct mtd_info), GFP_KERNEL);
if (!nc) {
printk(KERN_ERR "orion_nand: failed to allocate device structure.\n");
ret = -ENOMEM;
goto no_res;
}
mtd = (struct mtd_info *)(nc + 1);
io_base = ioremap(pdev->resource[0].start,
pdev->resource[0].end - pdev->resource[0].start + 1);
if (!io_base) {
printk(KERN_ERR "orion_nand: ioremap failed\n");
ret = -EIO;
goto no_res;
}
board = pdev->dev.platform_data;
mtd->priv = nc;
mtd->owner = THIS_MODULE;
nc->priv = board;
nc->IO_ADDR_R = nc->IO_ADDR_W = io_base;
nc->cmd_ctrl = orion_nand_cmd_ctrl;
nc->read_buf = orion_nand_read_buf;
nc->ecc.mode = NAND_ECC_SOFT;
if (board->chip_delay)
nc->chip_delay = board->chip_delay;
if (board->width == 16)
nc->options |= NAND_BUSWIDTH_16;
platform_set_drvdata(pdev, mtd);
if (nand_scan(mtd, 1)) {
ret = -ENXIO;
goto no_dev;
}
#ifdef CONFIG_MTD_PARTITIONS
#ifdef CONFIG_MTD_CMDLINE_PARTS
mtd->name = "orion_nand";
num_part = parse_mtd_partitions(mtd, part_probes, &partitions, 0);
#endif
/* If cmdline partitions have been passed, let them be used */
if (num_part <= 0) {
num_part = board->nr_parts;
partitions = board->parts;
}
if (partitions && num_part > 0)
ret = add_mtd_partitions(mtd, partitions, num_part);
else
ret = add_mtd_device(mtd);
#else
ret = add_mtd_device(mtd);
#endif
if (ret) {
nand_release(mtd);
goto no_dev;
}
return 0;
no_dev:
platform_set_drvdata(pdev, NULL);
iounmap(io_base);
no_res:
kfree(nc);
return ret;
}
static int __devexit orion_nand_remove(struct platform_device *pdev)
{
struct mtd_info *mtd = platform_get_drvdata(pdev);
struct nand_chip *nc = mtd->priv;
nand_release(mtd);
iounmap(nc->IO_ADDR_W);
kfree(nc);
return 0;
}
static struct platform_driver orion_nand_driver = {
.remove = __devexit_p(orion_nand_remove),
.driver = {
.name = "orion_nand",
.owner = THIS_MODULE,
},
};
static int __init orion_nand_init(void)
{
return platform_driver_probe(&orion_nand_driver, orion_nand_probe);
}
static void __exit orion_nand_exit(void)
{
platform_driver_unregister(&orion_nand_driver);
}
module_init(orion_nand_init);
module_exit(orion_nand_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Tzachi Perelstein");
MODULE_DESCRIPTION("NAND glue for Orion platforms");
MODULE_ALIAS("platform:orion_nand");
|
