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[~shefty/rdma-dev.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_partition    *parts;
45         int                     nr_parts;
46         struct mtd_info         *mtd;
47         struct map_info         map;
48 };
49
50
51 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
52
53
54 static int __devinit pxa2xx_flash_probe(struct platform_device *pdev)
55 {
56         struct flash_platform_data *flash = pdev->dev.platform_data;
57         struct pxa2xx_flash_info *info;
58         struct mtd_partition *parts;
59         struct resource *res;
60         int ret = 0;
61
62         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
63         if (!res)
64                 return -ENODEV;
65
66         info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
67         if (!info)
68                 return -ENOMEM;
69
70         info->map.name = (char *) flash->name;
71         info->map.bankwidth = flash->width;
72         info->map.phys = res->start;
73         info->map.size = res->end - res->start + 1;
74         info->parts = flash->parts;
75         info->nr_parts = flash->nr_parts;
76
77         info->map.virt = ioremap(info->map.phys, info->map.size);
78         if (!info->map.virt) {
79                 printk(KERN_WARNING "Failed to ioremap %s\n",
80                        info->map.name);
81                 return -ENOMEM;
82         }
83         info->map.cached =
84                 ioremap_cached(info->map.phys, info->map.size);
85         if (!info->map.cached)
86                 printk(KERN_WARNING "Failed to ioremap cached %s\n",
87                        info->map.name);
88         info->map.inval_cache = pxa2xx_map_inval_cache;
89         simple_map_init(&info->map);
90
91         printk(KERN_NOTICE
92                "Probing %s at physical address 0x%08lx"
93                " (%d-bit bankwidth)\n",
94                info->map.name, (unsigned long)info->map.phys,
95                info->map.bankwidth * 8);
96
97         info->mtd = do_map_probe(flash->map_name, &info->map);
98
99         if (!info->mtd) {
100                 iounmap((void *)info->map.virt);
101                 if (info->map.cached)
102                         iounmap(info->map.cached);
103                 return -EIO;
104         }
105         info->mtd->owner = THIS_MODULE;
106
107 #ifdef CONFIG_MTD_PARTITIONS
108         ret = parse_mtd_partitions(info->mtd, probes, &parts, 0);
109
110         if (ret > 0) {
111                 info->nr_parts = ret;
112                 info->parts = parts;
113         }
114 #endif
115
116         if (info->nr_parts) {
117                 add_mtd_partitions(info->mtd, info->parts,
118                                    info->nr_parts);
119         } else {
120                 printk("Registering %s as whole device\n",
121                        info->map.name);
122                 add_mtd_device(info->mtd);
123         }
124
125         platform_set_drvdata(pdev, info);
126         return 0;
127 }
128
129 static int __devexit pxa2xx_flash_remove(struct platform_device *dev)
130 {
131         struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
132
133         platform_set_drvdata(dev, NULL);
134
135 #ifdef CONFIG_MTD_PARTITIONS
136         if (info->nr_parts)
137                 del_mtd_partitions(info->mtd);
138         else
139 #endif
140                 del_mtd_device(info->mtd);
141
142         map_destroy(info->mtd);
143         iounmap(info->map.virt);
144         if (info->map.cached)
145                 iounmap(info->map.cached);
146         kfree(info->parts);
147         kfree(info);
148         return 0;
149 }
150
151 #ifdef CONFIG_PM
152 static void pxa2xx_flash_shutdown(struct platform_device *dev)
153 {
154         struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
155
156         if (info && info->mtd->suspend(info->mtd) == 0)
157                 info->mtd->resume(info->mtd);
158 }
159 #else
160 #define pxa2xx_flash_shutdown NULL
161 #endif
162
163 static struct platform_driver pxa2xx_flash_driver = {
164         .driver = {
165                 .name           = "pxa2xx-flash",
166                 .owner          = THIS_MODULE,
167         },
168         .probe          = pxa2xx_flash_probe,
169         .remove         = __devexit_p(pxa2xx_flash_remove),
170         .shutdown       = pxa2xx_flash_shutdown,
171 };
172
173 static int __init init_pxa2xx_flash(void)
174 {
175         return platform_driver_register(&pxa2xx_flash_driver);
176 }
177
178 static void __exit cleanup_pxa2xx_flash(void)
179 {
180         platform_driver_unregister(&pxa2xx_flash_driver);
181 }
182
183 module_init(init_pxa2xx_flash);
184 module_exit(cleanup_pxa2xx_flash);
185
186 MODULE_LICENSE("GPL");
187 MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
188 MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");