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/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
24 #include <asm/mach/flash.h>
25
26 #define CACHELINESIZE 32
27
pxa2xx_map_inval_cache(struct map_info * map,unsigned long from,ssize_t len)28 static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from,
29 ssize_t len)
30 {
31 unsigned long start = (unsigned long)map->cached + from;
32 unsigned long end = start + len;
33
34 start &= ~(CACHELINESIZE - 1);
35 while (start < end) {
36 /* invalidate D cache line */
37 asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start));
38 start += CACHELINESIZE;
39 }
40 }
41
42 struct pxa2xx_flash_info {
43 struct mtd_info *mtd;
44 struct map_info map;
45 };
46
47 static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };
48
pxa2xx_flash_probe(struct platform_device * pdev)49 static int pxa2xx_flash_probe(struct platform_device *pdev)
50 {
51 struct flash_platform_data *flash = dev_get_platdata(&pdev->dev);
52 struct pxa2xx_flash_info *info;
53 struct resource *res;
54
55 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
56 if (!res)
57 return -ENODEV;
58
59 info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
60 if (!info)
61 return -ENOMEM;
62
63 info->map.name = flash->name;
64 info->map.bankwidth = flash->width;
65 info->map.phys = res->start;
66 info->map.size = resource_size(res);
67
68 info->map.virt = ioremap(info->map.phys, info->map.size);
69 if (!info->map.virt) {
70 printk(KERN_WARNING "Failed to ioremap %s\n",
71 info->map.name);
72 return -ENOMEM;
73 }
74 info->map.cached =
75 ioremap_cached(info->map.phys, info->map.size);
76 if (!info->map.cached)
77 printk(KERN_WARNING "Failed to ioremap cached %s\n",
78 info->map.name);
79 info->map.inval_cache = pxa2xx_map_inval_cache;
80 simple_map_init(&info->map);
81
82 printk(KERN_NOTICE
83 "Probing %s at physical address 0x%08lx"
84 " (%d-bit bankwidth)\n",
85 info->map.name, (unsigned long)info->map.phys,
86 info->map.bankwidth * 8);
87
88 info->mtd = do_map_probe(flash->map_name, &info->map);
89
90 if (!info->mtd) {
91 iounmap((void *)info->map.virt);
92 if (info->map.cached)
93 iounmap(info->map.cached);
94 return -EIO;
95 }
96 info->mtd->dev.parent = &pdev->dev;
97
98 mtd_device_parse_register(info->mtd, probes, NULL, flash->parts,
99 flash->nr_parts);
100
101 platform_set_drvdata(pdev, info);
102 return 0;
103 }
104
pxa2xx_flash_remove(struct platform_device * dev)105 static int pxa2xx_flash_remove(struct platform_device *dev)
106 {
107 struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
108
109 mtd_device_unregister(info->mtd);
110
111 map_destroy(info->mtd);
112 iounmap(info->map.virt);
113 if (info->map.cached)
114 iounmap(info->map.cached);
115 kfree(info);
116 return 0;
117 }
118
119 #ifdef CONFIG_PM
pxa2xx_flash_shutdown(struct platform_device * dev)120 static void pxa2xx_flash_shutdown(struct platform_device *dev)
121 {
122 struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
123
124 if (info && mtd_suspend(info->mtd) == 0)
125 mtd_resume(info->mtd);
126 }
127 #else
128 #define pxa2xx_flash_shutdown NULL
129 #endif
130
131 static struct platform_driver pxa2xx_flash_driver = {
132 .driver = {
133 .name = "pxa2xx-flash",
134 },
135 .probe = pxa2xx_flash_probe,
136 .remove = pxa2xx_flash_remove,
137 .shutdown = pxa2xx_flash_shutdown,
138 };
139
140 module_platform_driver(pxa2xx_flash_driver);
141
142 MODULE_LICENSE("GPL");
143 MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
144 MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");
145