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e644f7d6 TP |
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/dma-mapping.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 <asm/hardware.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 | consistent_sync((char *)map->cached + from, len, DMA_FROM_DEVICE); | |
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"); |