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
25 struct rbtx4939_flash_info {
26 struct mtd_info *mtd;
27 struct map_info map;
28 };
29
rbtx4939_flash_remove(struct platform_device * dev)30 static 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
48 static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL };
49
rbtx4939_flash_probe(struct platform_device * dev)50 static int rbtx4939_flash_probe(struct platform_device *dev)
51 {
52 struct rbtx4939_flash_data *pdata;
53 struct rbtx4939_flash_info *info;
54 struct resource *res;
55 const char **probe_type;
56 int err = 0;
57 unsigned long size;
58
59 pdata = dev->dev.platform_data;
60 if (!pdata)
61 return -ENODEV;
62
63 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
64 if (!res)
65 return -ENODEV;
66 info = devm_kzalloc(&dev->dev, sizeof(struct rbtx4939_flash_info),
67 GFP_KERNEL);
68 if (!info)
69 return -ENOMEM;
70
71 platform_set_drvdata(dev, info);
72
73 size = resource_size(res);
74 pr_notice("rbtx4939 platform flash device: %pR\n", res);
75
76 if (!devm_request_mem_region(&dev->dev, res->start, size,
77 dev_name(&dev->dev)))
78 return -EBUSY;
79
80 info->map.name = dev_name(&dev->dev);
81 info->map.phys = res->start;
82 info->map.size = size;
83 info->map.bankwidth = pdata->width;
84
85 info->map.virt = devm_ioremap(&dev->dev, info->map.phys, size);
86 if (!info->map.virt)
87 return -EBUSY;
88
89 if (pdata->map_init)
90 (*pdata->map_init)(&info->map);
91 else
92 simple_map_init(&info->map);
93
94 probe_type = rom_probe_types;
95 for (; !info->mtd && *probe_type; probe_type++)
96 info->mtd = do_map_probe(*probe_type, &info->map);
97 if (!info->mtd) {
98 dev_err(&dev->dev, "map_probe failed\n");
99 err = -ENXIO;
100 goto err_out;
101 }
102 info->mtd->owner = THIS_MODULE;
103 if (err)
104 goto err_out;
105 err = mtd_device_parse_register(info->mtd, NULL, 0,
106 pdata->parts, pdata->nr_parts);
107
108 if (err)
109 goto err_out;
110 return 0;
111
112 err_out:
113 rbtx4939_flash_remove(dev);
114 return err;
115 }
116
117 #ifdef CONFIG_PM
rbtx4939_flash_shutdown(struct platform_device * dev)118 static void rbtx4939_flash_shutdown(struct platform_device *dev)
119 {
120 struct rbtx4939_flash_info *info = platform_get_drvdata(dev);
121
122 if (mtd_suspend(info->mtd) == 0)
123 mtd_resume(info->mtd);
124 }
125 #else
126 #define rbtx4939_flash_shutdown NULL
127 #endif
128
129 static struct platform_driver rbtx4939_flash_driver = {
130 .probe = rbtx4939_flash_probe,
131 .remove = rbtx4939_flash_remove,
132 .shutdown = rbtx4939_flash_shutdown,
133 .driver = {
134 .name = "rbtx4939-flash",
135 .owner = THIS_MODULE,
136 },
137 };
138
139 module_platform_driver(rbtx4939_flash_driver);
140
141 MODULE_LICENSE("GPL");
142 MODULE_DESCRIPTION("RBTX4939 MTD map driver");
143 MODULE_ALIAS("platform:rbtx4939-flash");
144