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
28static 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
42struct pxa2xx_flash_info {
43	struct mtd_info		*mtd;
44	struct map_info		map;
45};
46
47static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };
48
49static 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 = memremap(info->map.phys, info->map.size,
75			MEMREMAP_WB);
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
105static 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		memunmap(info->map.cached);
115	kfree(info);
116	return 0;
117}
118
119#ifdef CONFIG_PM
120static 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
131static 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
140module_platform_driver(pxa2xx_flash_driver);
141
142MODULE_LICENSE("GPL");
143MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
144MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");
145