tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Map driver for Intel XScale PXA2xx platforms.
3 *
4 * Author: Nicolas Pitre
5 * Copyright: (C) 2001 MontaVista Software Inc.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/module.h>
13#include <linux/types.h>
14#include <linux/slab.h>
15#include <linux/kernel.h>
16#include <linux/init.h>
17#include <linux/platform_device.h>
18#include <linux/mtd/mtd.h>
19#include <linux/mtd/map.h>
20#include <linux/mtd/partitions.h>
21
22#include <asm/io.h>
23#include <mach/hardware.h>
24
25#include <asm/mach/flash.h>
26
27#define CACHELINESIZE 32
28
29static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from,
30 ssize_t len)
31{
32 unsigned long start = (unsigned long)map->cached + from;
33 unsigned long end = start + len;
34
35 start &= ~(CACHELINESIZE - 1);
36 while (start < end) {
37 /* invalidate D cache line */
38 asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start));
39 start += CACHELINESIZE;
40 }
41}
42
43struct pxa2xx_flash_info {
44 struct mtd_info *mtd;
45 struct map_info map;
46};
47
48
49static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
50
51
52static int __devinit pxa2xx_flash_probe(struct platform_device *pdev)
53{
54 struct flash_platform_data *flash = pdev->dev.platform_data;
55 struct pxa2xx_flash_info *info;
56 struct resource *res;
57
58 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
59 if (!res)
60 return -ENODEV;
61
62 info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
63 if (!info)
64 return -ENOMEM;
65
66 info->map.name = (char *) flash->name;
67 info->map.bankwidth = flash->width;
68 info->map.phys = res->start;
69 info->map.size = resource_size(res);
70
71 info->map.virt = ioremap(info->map.phys, info->map.size);
72 if (!info->map.virt) {
73 printk(KERN_WARNING "Failed to ioremap %s\n",
74 info->map.name);
75 return -ENOMEM;
76 }
77 info->map.cached =
78 ioremap_cached(info->map.phys, info->map.size);
79 if (!info->map.cached)
80 printk(KERN_WARNING "Failed to ioremap cached %s\n",
81 info->map.name);
82 info->map.inval_cache = pxa2xx_map_inval_cache;
83 simple_map_init(&info->map);
84
85 printk(KERN_NOTICE
86 "Probing %s at physical address 0x%08lx"
87 " (%d-bit bankwidth)\n",
88 info->map.name, (unsigned long)info->map.phys,
89 info->map.bankwidth * 8);
90
91 info->mtd = do_map_probe(flash->map_name, &info->map);
92
93 if (!info->mtd) {
94 iounmap((void *)info->map.virt);
95 if (info->map.cached)
96 iounmap(info->map.cached);
97 return -EIO;
98 }
99 info->mtd->owner = THIS_MODULE;
100
101 mtd_device_parse_register(info->mtd, probes, 0, flash->parts, flash->nr_parts);
102
103 platform_set_drvdata(pdev, info);
104 return 0;
105}
106
107static int __devexit pxa2xx_flash_remove(struct platform_device *dev)
108{
109 struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
110
111 platform_set_drvdata(dev, NULL);
112
113 mtd_device_unregister(info->mtd);
114
115 map_destroy(info->mtd);
116 iounmap(info->map.virt);
117 if (info->map.cached)
118 iounmap(info->map.cached);
119 kfree(info);
120 return 0;
121}
122
123#ifdef CONFIG_PM
124static void pxa2xx_flash_shutdown(struct platform_device *dev)
125{
126 struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
127
128 if (info && mtd_suspend(info->mtd) == 0)
129 mtd_resume(info->mtd);
130}
131#else
132#define pxa2xx_flash_shutdown NULL
133#endif
134
135static struct platform_driver pxa2xx_flash_driver = {
136 .driver = {
137 .name = "pxa2xx-flash",
138 .owner = THIS_MODULE,
139 },
140 .probe = pxa2xx_flash_probe,
141 .remove = __devexit_p(pxa2xx_flash_remove),
142 .shutdown = pxa2xx_flash_shutdown,
143};
144
145module_platform_driver(pxa2xx_flash_driver);
146
147MODULE_LICENSE("GPL");
148MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
149MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");