tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * rbtx4939-flash (based on physmap.c)
3 *
4 * This is a simplified physmap driver with map_init callback function.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Copyright (C) 2009 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
11 */
12
13#include <linux/module.h>
14#include <linux/types.h>
15#include <linux/kernel.h>
16#include <linux/init.h>
17#include <linux/slab.h>
18#include <linux/device.h>
19#include <linux/platform_device.h>
20#include <linux/mtd/mtd.h>
21#include <linux/mtd/map.h>
22#include <linux/mtd/partitions.h>
23#include <asm/txx9/rbtx4939.h>
24
25struct rbtx4939_flash_info {
26 struct mtd_info *mtd;
27 struct map_info map;
28};
29
30static int rbtx4939_flash_remove(struct platform_device *dev)
31{
32 struct rbtx4939_flash_info *info;
33
34 info = platform_get_drvdata(dev);
35 if (!info)
36 return 0;
37 platform_set_drvdata(dev, NULL);
38
39 if (info->mtd) {
40 struct rbtx4939_flash_data *pdata = dev->dev.platform_data;
41
42 mtd_device_unregister(info->mtd);
43 map_destroy(info->mtd);
44 }
45 return 0;
46}
47
48static const char * const rom_probe_types[] = {
49 "cfi_probe", "jedec_probe", NULL };
50
51static int rbtx4939_flash_probe(struct platform_device *dev)
52{
53 struct rbtx4939_flash_data *pdata;
54 struct rbtx4939_flash_info *info;
55 struct resource *res;
56 const char * const *probe_type;
57 int err = 0;
58 unsigned long size;
59
60 pdata = dev->dev.platform_data;
61 if (!pdata)
62 return -ENODEV;
63
64 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
65 if (!res)
66 return -ENODEV;
67 info = devm_kzalloc(&dev->dev, sizeof(struct rbtx4939_flash_info),
68 GFP_KERNEL);
69 if (!info)
70 return -ENOMEM;
71
72 platform_set_drvdata(dev, info);
73
74 size = resource_size(res);
75 pr_notice("rbtx4939 platform flash device: %pR\n", res);
76
77 if (!devm_request_mem_region(&dev->dev, res->start, size,
78 dev_name(&dev->dev)))
79 return -EBUSY;
80
81 info->map.name = dev_name(&dev->dev);
82 info->map.phys = res->start;
83 info->map.size = size;
84 info->map.bankwidth = pdata->width;
85
86 info->map.virt = devm_ioremap(&dev->dev, info->map.phys, size);
87 if (!info->map.virt)
88 return -EBUSY;
89
90 if (pdata->map_init)
91 (*pdata->map_init)(&info->map);
92 else
93 simple_map_init(&info->map);
94
95 probe_type = rom_probe_types;
96 for (; !info->mtd && *probe_type; probe_type++)
97 info->mtd = do_map_probe(*probe_type, &info->map);
98 if (!info->mtd) {
99 dev_err(&dev->dev, "map_probe failed\n");
100 err = -ENXIO;
101 goto err_out;
102 }
103 info->mtd->owner = THIS_MODULE;
104 err = mtd_device_parse_register(info->mtd, NULL, NULL, pdata->parts,
105 pdata->nr_parts);
106
107 if (err)
108 goto err_out;
109 return 0;
110
111err_out:
112 rbtx4939_flash_remove(dev);
113 return err;
114}
115
116#ifdef CONFIG_PM
117static void rbtx4939_flash_shutdown(struct platform_device *dev)
118{
119 struct rbtx4939_flash_info *info = platform_get_drvdata(dev);
120
121 if (mtd_suspend(info->mtd) == 0)
122 mtd_resume(info->mtd);
123}
124#else
125#define rbtx4939_flash_shutdown NULL
126#endif
127
128static struct platform_driver rbtx4939_flash_driver = {
129 .probe = rbtx4939_flash_probe,
130 .remove = rbtx4939_flash_remove,
131 .shutdown = rbtx4939_flash_shutdown,
132 .driver = {
133 .name = "rbtx4939-flash",
134 .owner = THIS_MODULE,
135 },
136};
137
138module_platform_driver(rbtx4939_flash_driver);
139
140MODULE_LICENSE("GPL");
141MODULE_DESCRIPTION("RBTX4939 MTD map driver");
142MODULE_ALIAS("platform:rbtx4939-flash");