Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[linux-drm-fsl-dcu.git] / drivers / mtd / maps / pxa2xx-flash.c
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
29 static 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
43 struct pxa2xx_flash_info {
44         struct mtd_info         *mtd;
45         struct map_info         map;
46 };
47
48 static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };
49
50 static 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_cache(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
106 static 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
121 static 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
132 static 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
142 module_platform_driver(pxa2xx_flash_driver);
143
144 MODULE_LICENSE("GPL");
145 MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
146 MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");