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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