Merge branch 'simplify_PRT' into release
[linux-2.6] / 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/kernel.h>
15 #include <linux/init.h>
16 #include <linux/platform_device.h>
17 #include <linux/mtd/mtd.h>
18 #include <linux/mtd/map.h>
19 #include <linux/mtd/partitions.h>
20
21 #include <asm/io.h>
22 #include <mach/hardware.h>
23 #include <asm/cacheflush.h>
24
25 #include <asm/mach/flash.h>
26
27 static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from,
28                                       ssize_t len)
29 {
30         flush_ioremap_region(map->phys, map->cached, from, len);
31 }
32
33 struct pxa2xx_flash_info {
34         struct mtd_partition    *parts;
35         int                     nr_parts;
36         struct mtd_info         *mtd;
37         struct map_info         map;
38 };
39
40
41 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
42
43
44 static int __init pxa2xx_flash_probe(struct device *dev)
45 {
46         struct platform_device *pdev = to_platform_device(dev);
47         struct flash_platform_data *flash = pdev->dev.platform_data;
48         struct pxa2xx_flash_info *info;
49         struct mtd_partition *parts;
50         struct resource *res;
51         int ret = 0;
52
53         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
54         if (!res)
55                 return -ENODEV;
56
57         info = kmalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
58         if (!info)
59                 return -ENOMEM;
60
61         memset(info, 0, sizeof(struct pxa2xx_flash_info));
62         info->map.name = (char *) flash->name;
63         info->map.bankwidth = flash->width;
64         info->map.phys = res->start;
65         info->map.size = res->end - res->start + 1;
66         info->parts = flash->parts;
67         info->nr_parts = flash->nr_parts;
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 #ifdef CONFIG_MTD_PARTITIONS
100         ret = parse_mtd_partitions(info->mtd, probes, &parts, 0);
101
102         if (ret > 0) {
103                 info->nr_parts = ret;
104                 info->parts = parts;
105         }
106 #endif
107
108         if (info->nr_parts) {
109                 add_mtd_partitions(info->mtd, info->parts,
110                                    info->nr_parts);
111         } else {
112                 printk("Registering %s as whole device\n",
113                        info->map.name);
114                 add_mtd_device(info->mtd);
115         }
116
117         dev_set_drvdata(dev, info);
118         return 0;
119 }
120
121 static int __exit pxa2xx_flash_remove(struct device *dev)
122 {
123         struct pxa2xx_flash_info *info = dev_get_drvdata(dev);
124
125         dev_set_drvdata(dev, NULL);
126
127 #ifdef CONFIG_MTD_PARTITIONS
128         if (info->nr_parts)
129                 del_mtd_partitions(info->mtd);
130         else
131 #endif
132                 del_mtd_device(info->mtd);
133
134         map_destroy(info->mtd);
135         iounmap(info->map.virt);
136         if (info->map.cached)
137                 iounmap(info->map.cached);
138         kfree(info->parts);
139         kfree(info);
140         return 0;
141 }
142
143 #ifdef CONFIG_PM
144 static int pxa2xx_flash_suspend(struct device *dev, pm_message_t state)
145 {
146         struct pxa2xx_flash_info *info = dev_get_drvdata(dev);
147         int ret = 0;
148
149         if (info->mtd && info->mtd->suspend)
150                 ret = info->mtd->suspend(info->mtd);
151         return ret;
152 }
153
154 static int pxa2xx_flash_resume(struct device *dev)
155 {
156         struct pxa2xx_flash_info *info = dev_get_drvdata(dev);
157
158         if (info->mtd && info->mtd->resume)
159                 info->mtd->resume(info->mtd);
160         return 0;
161 }
162 static void pxa2xx_flash_shutdown(struct device *dev)
163 {
164         struct pxa2xx_flash_info *info = dev_get_drvdata(dev);
165
166         if (info && info->mtd->suspend(info->mtd) == 0)
167                 info->mtd->resume(info->mtd);
168 }
169 #else
170 #define pxa2xx_flash_suspend NULL
171 #define pxa2xx_flash_resume NULL
172 #define pxa2xx_flash_shutdown NULL
173 #endif
174
175 static struct device_driver pxa2xx_flash_driver = {
176         .name           = "pxa2xx-flash",
177         .bus            = &platform_bus_type,
178         .probe          = pxa2xx_flash_probe,
179         .remove         = __exit_p(pxa2xx_flash_remove),
180         .suspend        = pxa2xx_flash_suspend,
181         .resume         = pxa2xx_flash_resume,
182         .shutdown       = pxa2xx_flash_shutdown,
183 };
184
185 static int __init init_pxa2xx_flash(void)
186 {
187         return driver_register(&pxa2xx_flash_driver);
188 }
189
190 static void __exit cleanup_pxa2xx_flash(void)
191 {
192         driver_unregister(&pxa2xx_flash_driver);
193 }
194
195 module_init(init_pxa2xx_flash);
196 module_exit(cleanup_pxa2xx_flash);
197
198 MODULE_LICENSE("GPL");
199 MODULE_AUTHOR("Nicolas Pitre <nico@cam.org>");
200 MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");