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/slab.h>
17 #include <linux/device.h>
18 #include <linux/platform_device.h>
19 #include <linux/mtd/mtd.h>
20 #include <linux/mtd/map.h>
21 #include <linux/mtd/partitions.h>
22 #include <asm/txx9/rbtx4939.h>
23
24 struct rbtx4939_flash_info {
25 struct mtd_info *mtd;
26 struct map_info map;
27 };
28
rbtx4939_flash_remove(struct platform_device * dev)29 static int rbtx4939_flash_remove(struct platform_device *dev)
30 {
31 struct rbtx4939_flash_info *info;
32
33 info = platform_get_drvdata(dev);
34 if (!info)
35 return 0;
36
37 if (info->mtd) {
38 mtd_device_unregister(info->mtd);
39 map_destroy(info->mtd);
40 }
41 return 0;
42 }
43
44 static const char * const rom_probe_types[] = {
45 "cfi_probe", "jedec_probe", NULL };
46
rbtx4939_flash_probe(struct platform_device * dev)47 static int rbtx4939_flash_probe(struct platform_device *dev)
48 {
49 struct rbtx4939_flash_data *pdata;
50 struct rbtx4939_flash_info *info;
51 struct resource *res;
52 const char * const *probe_type;
53 int err = 0;
54 unsigned long size;
55
56 pdata = dev_get_platdata(&dev->dev);
57 if (!pdata)
58 return -ENODEV;
59
60 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
61 if (!res)
62 return -ENODEV;
63 info = devm_kzalloc(&dev->dev, sizeof(struct rbtx4939_flash_info),
64 GFP_KERNEL);
65 if (!info)
66 return -ENOMEM;
67
68 platform_set_drvdata(dev, info);
69
70 size = resource_size(res);
71 pr_notice("rbtx4939 platform flash device: %pR\n", res);
72
73 if (!devm_request_mem_region(&dev->dev, res->start, size,
74 dev_name(&dev->dev)))
75 return -EBUSY;
76
77 info->map.name = dev_name(&dev->dev);
78 info->map.phys = res->start;
79 info->map.size = size;
80 info->map.bankwidth = pdata->width;
81
82 info->map.virt = devm_ioremap(&dev->dev, info->map.phys, size);
83 if (!info->map.virt)
84 return -EBUSY;
85
86 if (pdata->map_init)
87 (*pdata->map_init)(&info->map);
88 else
89 simple_map_init(&info->map);
90
91 probe_type = rom_probe_types;
92 for (; !info->mtd && *probe_type; probe_type++)
93 info->mtd = do_map_probe(*probe_type, &info->map);
94 if (!info->mtd) {
95 dev_err(&dev->dev, "map_probe failed\n");
96 err = -ENXIO;
97 goto err_out;
98 }
99 info->mtd->dev.parent = &dev->dev;
100 err = mtd_device_register(info->mtd, pdata->parts, pdata->nr_parts);
101
102 if (err)
103 goto err_out;
104 return 0;
105
106 err_out:
107 rbtx4939_flash_remove(dev);
108 return err;
109 }
110
111 #ifdef CONFIG_PM
rbtx4939_flash_shutdown(struct platform_device * dev)112 static void rbtx4939_flash_shutdown(struct platform_device *dev)
113 {
114 struct rbtx4939_flash_info *info = platform_get_drvdata(dev);
115
116 if (mtd_suspend(info->mtd) == 0)
117 mtd_resume(info->mtd);
118 }
119 #else
120 #define rbtx4939_flash_shutdown NULL
121 #endif
122
123 static struct platform_driver rbtx4939_flash_driver = {
124 .probe = rbtx4939_flash_probe,
125 .remove = rbtx4939_flash_remove,
126 .shutdown = rbtx4939_flash_shutdown,
127 .driver = {
128 .name = "rbtx4939-flash",
129 },
130 };
131
132 module_platform_driver(rbtx4939_flash_driver);
133
134 MODULE_LICENSE("GPL");
135 MODULE_DESCRIPTION("RBTX4939 MTD map driver");
136 MODULE_ALIAS("platform:rbtx4939-flash");
137
