tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Map driver for Intel XScale PXA2xx platforms.
4 *
5 * Author: Nicolas Pitre
6 * Copyright: (C) 2001 MontaVista Software Inc.
7 */
8
9#include <linux/module.h>
10#include <linux/types.h>
11#include <linux/slab.h>
12#include <linux/kernel.h>
13#include <linux/platform_device.h>
14#include <linux/mtd/mtd.h>
15#include <linux/mtd/map.h>
16#include <linux/mtd/partitions.h>
17
18#include <asm/io.h>
19#include <mach/hardware.h>
20
21#include <asm/mach/flash.h>
22
23#define CACHELINESIZE 32
24
25static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from,
26 ssize_t len)
27{
28 unsigned long start = (unsigned long)map->cached + from;
29 unsigned long end = start + len;
30
31 start &= ~(CACHELINESIZE - 1);
32 while (start < end) {
33 /* invalidate D cache line */
34 asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start));
35 start += CACHELINESIZE;
36 }
37}
38
39struct pxa2xx_flash_info {
40 struct mtd_info *mtd;
41 struct map_info map;
42};
43
44static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };
45
46static int pxa2xx_flash_probe(struct platform_device *pdev)
47{
48 struct flash_platform_data *flash = dev_get_platdata(&pdev->dev);
49 struct pxa2xx_flash_info *info;
50 struct resource *res;
51
52 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
53 if (!res)
54 return -ENODEV;
55
56 info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
57 if (!info)
58 return -ENOMEM;
59
60 info->map.name = flash->name;
61 info->map.bankwidth = flash->width;
62 info->map.phys = res->start;
63 info->map.size = resource_size(res);
64
65 info->map.virt = ioremap(info->map.phys, info->map.size);
66 if (!info->map.virt) {
67 printk(KERN_WARNING "Failed to ioremap %s\n",
68 info->map.name);
69 return -ENOMEM;
70 }
71 info->map.cached =
72 ioremap_cached(info->map.phys, info->map.size);
73 if (!info->map.cached)
74 printk(KERN_WARNING "Failed to ioremap cached %s\n",
75 info->map.name);
76 info->map.inval_cache = pxa2xx_map_inval_cache;
77 simple_map_init(&info->map);
78
79 printk(KERN_NOTICE
80 "Probing %s at physical address 0x%08lx"
81 " (%d-bit bankwidth)\n",
82 info->map.name, (unsigned long)info->map.phys,
83 info->map.bankwidth * 8);
84
85 info->mtd = do_map_probe(flash->map_name, &info->map);
86
87 if (!info->mtd) {
88 iounmap((void *)info->map.virt);
89 if (info->map.cached)
90 iounmap(info->map.cached);
91 return -EIO;
92 }
93 info->mtd->dev.parent = &pdev->dev;
94
95 mtd_device_parse_register(info->mtd, probes, NULL, flash->parts,
96 flash->nr_parts);
97
98 platform_set_drvdata(pdev, info);
99 return 0;
100}
101
102static int pxa2xx_flash_remove(struct platform_device *dev)
103{
104 struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
105
106 mtd_device_unregister(info->mtd);
107
108 map_destroy(info->mtd);
109 iounmap(info->map.virt);
110 if (info->map.cached)
111 iounmap(info->map.cached);
112 kfree(info);
113 return 0;
114}
115
116#ifdef CONFIG_PM
117static void pxa2xx_flash_shutdown(struct platform_device *dev)
118{
119 struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
120
121 if (info && mtd_suspend(info->mtd) == 0)
122 mtd_resume(info->mtd);
123}
124#else
125#define pxa2xx_flash_shutdown NULL
126#endif
127
128static struct platform_driver pxa2xx_flash_driver = {
129 .driver = {
130 .name = "pxa2xx-flash",
131 },
132 .probe = pxa2xx_flash_probe,
133 .remove = pxa2xx_flash_remove,
134 .shutdown = pxa2xx_flash_shutdown,
135};
136
137module_platform_driver(pxa2xx_flash_driver);
138
139MODULE_LICENSE("GPL");
140MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
141MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");