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
|
/*
* Map driver for Intel XScale PXA2xx platforms.
*
* Author: Nicolas Pitre
* Copyright: (C) 2001 MontaVista Software Inc.
*
* 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/module.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <asm/io.h>
#include <mach/hardware.h>
#include <asm/mach/flash.h>
#define CACHELINESIZE 32
static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from,
ssize_t len)
{
unsigned long start = (unsigned long)map->cached + from;
unsigned long end = start + len;
start &= ~(CACHELINESIZE - 1);
while (start < end) {
/* invalidate D cache line */
asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start));
start += CACHELINESIZE;
}
}
struct pxa2xx_flash_info {
struct mtd_info *mtd;
struct map_info map;
};
static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };
static int pxa2xx_flash_probe(struct platform_device *pdev)
{
struct flash_platform_data *flash = dev_get_platdata(&pdev->dev);
struct pxa2xx_flash_info *info;
struct resource *res;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
if (!info)
return -ENOMEM;
info->map.name = flash->name;
info->map.bankwidth = flash->width;
info->map.phys = res->start;
info->map.size = resource_size(res);
info->map.virt = ioremap(info->map.phys, info->map.size);
if (!info->map.virt) {
printk(KERN_WARNING "Failed to ioremap %s\n",
info->map.name);
return -ENOMEM;
}
info->map.cached = memremap(info->map.phys, info->map.size,
MEMREMAP_WB);
if (!info->map.cached)
printk(KERN_WARNING "Failed to ioremap cached %s\n",
info->map.name);
info->map.inval_cache = pxa2xx_map_inval_cache;
simple_map_init(&info->map);
printk(KERN_NOTICE
"Probing %s at physical address 0x%08lx"
" (%d-bit bankwidth)\n",
info->map.name, (unsigned long)info->map.phys,
info->map.bankwidth * 8);
info->mtd = do_map_probe(flash->map_name, &info->map);
if (!info->mtd) {
iounmap((void *)info->map.virt);
if (info->map.cached)
iounmap(info->map.cached);
return -EIO;
}
info->mtd->dev.parent = &pdev->dev;
mtd_device_parse_register(info->mtd, probes, NULL, flash->parts,
flash->nr_parts);
platform_set_drvdata(pdev, info);
return 0;
}
static int pxa2xx_flash_remove(struct platform_device *dev)
{
struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
mtd_device_unregister(info->mtd);
map_destroy(info->mtd);
iounmap(info->map.virt);
if (info->map.cached)
memunmap(info->map.cached);
kfree(info);
return 0;
}
#ifdef CONFIG_PM
static void pxa2xx_flash_shutdown(struct platform_device *dev)
{
struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
if (info && mtd_suspend(info->mtd) == 0)
mtd_resume(info->mtd);
}
#else
#define pxa2xx_flash_shutdown NULL
#endif
static struct platform_driver pxa2xx_flash_driver = {
.driver = {
.name = "pxa2xx-flash",
},
.probe = pxa2xx_flash_probe,
.remove = pxa2xx_flash_remove,
.shutdown = pxa2xx_flash_shutdown,
};
module_platform_driver(pxa2xx_flash_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");
|
