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
48static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };
49
50static int pxa2xx_flash_probe(struct platform_device *pdev)
51{
52 struct flash_platform_data *flash = dev_get_platdata(&pdev->dev);
53 struct pxa2xx_flash_info *info;
54 struct resource *res;
55
56 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
57 if (!res)
58 return -ENODEV;
59
60 info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
61 if (!info)
62 return -ENOMEM;
63
64 info->map.name = (char *) flash->name;
65 info->map.bankwidth = flash->width;
66 info->map.phys = res->start;
67 info->map.size = resource_size(res);
68
69 info->map.virt = ioremap(info->map.phys, info->map.size);
70 if (!info->map.virt) {
71 printk(KERN_WARNING "Failed to ioremap %s\n",
72 info->map.name);
73 return -ENOMEM;
74 }
75 info->map.cached =
76 ioremap_cached(info->map.phys, info->map.size);
77 if (!info->map.cached)
78 printk(KERN_WARNING "Failed to ioremap cached %s\n",
79 info->map.name);
80 info->map.inval_cache = pxa2xx_map_inval_cache;
81 simple_map_init(&info->map);
82
83 printk(KERN_NOTICE
84 "Probing %s at physical address 0x%08lx"
85 " (%d-bit bankwidth)\n",
86 info->map.name, (unsigned long)info->map.phys,
87 info->map.bankwidth * 8);
88
89 info->mtd = do_map_probe(flash->map_name, &info->map);
90
91 if (!info->mtd) {
92 iounmap((void *)info->map.virt);
93 if (info->map.cached)
94 iounmap(info->map.cached);
95 return -EIO;
96 }
97 info->mtd->owner = THIS_MODULE;
98
99 mtd_device_parse_register(info->mtd, probes, NULL, flash->parts,
100 flash->nr_parts);
101
102 platform_set_drvdata(pdev, info);
103 return 0;
104}
105
106static int pxa2xx_flash_remove(struct platform_device *dev)
107{
108 struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
109
110 mtd_device_unregister(info->mtd);
111
112 map_destroy(info->mtd);
113 iounmap(info->map.virt);
114 if (info->map.cached)
115 iounmap(info->map.cached);
116 kfree(info);
117 return 0;
118}
119
120#ifdef CONFIG_PM
121static void pxa2xx_flash_shutdown(struct platform_device *dev)
122{
123 struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
124
125 if (info && mtd_suspend(info->mtd) == 0)
126 mtd_resume(info->mtd);
127}
128#else
129#define pxa2xx_flash_shutdown NULL
130#endif
131
132static struct platform_driver pxa2xx_flash_driver = {
133 .driver = {
134 .name = "pxa2xx-flash",
135 .owner = THIS_MODULE,
136 },
137 .probe = pxa2xx_flash_probe,
138 .remove = pxa2xx_flash_remove,
139 .shutdown = pxa2xx_flash_shutdown,
140};
141
142module_platform_driver(pxa2xx_flash_driver);
143
144MODULE_LICENSE("GPL");
145MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
146MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");