2 * Parallel flash driver for the Atheros AR91xx SoC
4 * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
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.
12 #include <linux/module.h>
13 #include <linux/types.h>
14 #include <linux/kernel.h>
15 #include <linux/init.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>
24 #include <asm/mach-ar71xx/ar71xx.h>
25 #include <asm/mach-ar71xx/platform.h>
27 #define DRV_NAME "ar91xx-flash"
29 struct ar91xx_flash_info
{
32 #ifdef CONFIG_MTD_PARTITIONS
34 struct mtd_partition
*parts
;
38 static map_word
ar91xx_flash_read(struct map_info
*map
, unsigned long ofs
)
42 if (map_bankwidth_is_1(map
))
43 val
.x
[0] = __raw_readb(map
->virt
+ (ofs
^ 3));
44 else if (map_bankwidth_is_2(map
))
45 val
.x
[0] = __raw_readw(map
->virt
+ (ofs
^ 2));
47 val
= map_word_ff(map
);
52 static void ar91xx_flash_write(struct map_info
*map
, map_word d
,
55 if (map_bankwidth_is_1(map
))
56 __raw_writeb(d
.x
[0], map
->virt
+ (ofs
^ 3));
57 else if (map_bankwidth_is_2(map
))
58 __raw_writew(d
.x
[0], map
->virt
+ (ofs
^ 2));
63 static int ar91xx_flash_remove(struct platform_device
*pdev
)
65 struct ar91xx_flash_platform_data
*pdata
;
66 struct ar91xx_flash_info
*info
;
68 info
= platform_get_drvdata(pdev
);
72 platform_set_drvdata(pdev
, NULL
);
74 if (info
->mtd
== NULL
)
77 pdata
= pdev
->dev
.platform_data
;
78 #ifdef CONFIG_MTD_PARTITIONS
80 del_mtd_partitions(info
->mtd
);
82 } else if (pdata
->nr_parts
) {
83 del_mtd_partitions(info
->mtd
);
85 del_mtd_device(info
->mtd
);
88 del_mtd_device(info
->mtd
);
90 map_destroy(info
->mtd
);
95 static const char *rom_probe_types
[] = { "cfi_probe", "jedec_probe", NULL
};
96 #ifdef CONFIG_MTD_PARTITIONS
97 static const char *part_probe_types
[] = { "cmdlinepart", "RedBoot", NULL
};
100 static int ar91xx_flash_probe(struct platform_device
*pdev
)
102 struct ar91xx_flash_platform_data
*pdata
;
103 struct ar91xx_flash_info
*info
;
104 struct resource
*res
;
105 struct resource
*region
;
106 const char **probe_type
;
109 pdata
= pdev
->dev
.platform_data
;
113 info
= devm_kzalloc(&pdev
->dev
, sizeof(struct ar91xx_flash_info
),
120 platform_set_drvdata(pdev
, info
);
122 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
128 dev_info(&pdev
->dev
, "%.8llx at %.8llx\n",
129 (unsigned long long)(res
->end
- res
->start
+ 1),
130 (unsigned long long)res
->start
);
132 region
= devm_request_mem_region(&pdev
->dev
,
133 res
->start
, res
->end
- res
->start
+ 1,
134 dev_name(&pdev
->dev
));
135 if (region
== NULL
) {
136 dev_err(&pdev
->dev
, "could not reserve memory region\n");
141 info
->map
.name
= dev_name(&pdev
->dev
);
142 info
->map
.phys
= res
->start
;
143 info
->map
.size
= res
->end
- res
->start
+ 1;
144 info
->map
.bankwidth
= pdata
->width
;
146 info
->map
.virt
= devm_ioremap(&pdev
->dev
, info
->map
.phys
,
148 if (info
->map
.virt
== NULL
) {
149 dev_err(&pdev
->dev
, "failed to ioremap flash region\n");
154 simple_map_init(&info
->map
);
155 info
->map
.read
= ar91xx_flash_read
;
156 info
->map
.write
= ar91xx_flash_write
;
158 probe_type
= rom_probe_types
;
159 for (; info
->mtd
== NULL
&& *probe_type
!= NULL
; probe_type
++)
160 info
->mtd
= do_map_probe(*probe_type
, &info
->map
);
162 if (info
->mtd
== NULL
) {
163 dev_err(&pdev
->dev
, "map_probe failed\n");
168 info
->mtd
->owner
= THIS_MODULE
;
170 #ifdef CONFIG_MTD_PARTITIONS
171 if (pdata
->nr_parts
) {
172 dev_info(&pdev
->dev
, "using static partition mapping\n");
173 add_mtd_partitions(info
->mtd
, pdata
->parts
, pdata
->nr_parts
);
177 err
= parse_mtd_partitions(info
->mtd
, part_probe_types
,
180 add_mtd_partitions(info
->mtd
, info
->parts
, err
);
185 add_mtd_device(info
->mtd
);
189 ar91xx_flash_remove(pdev
);
194 static int ar91xx_flash_suspend(struct platform_device
*dev
, pm_message_t state
)
196 struct ar91xx_flash_info
*info
= platform_get_drvdata(dev
);
199 if (info
->mtd
->suspend
)
200 ret
= info
->mtd
->suspend(info
->mtd
);
208 if (info
->mtd
->suspend
) {
209 BUG_ON(!info
->mtd
->resume
);
210 info
->mtd
->resume(info
->mtd
);
216 static int ar91xx_flash_resume(struct platform_device
*pdev
)
218 struct ar91xx_flash_info
*info
= platform_get_drvdata(pdev
);
220 if (info
->mtd
->resume
)
221 info
->mtd
->resume(info
->mtd
);
226 static void ar91xx_flash_shutdown(struct platform_device
*pdev
)
228 struct ar91xx_flash_info
*info
= platform_get_drvdata(pdev
);
230 if (info
->mtd
->suspend
&& info
->mtd
->resume
)
231 if (info
->mtd
->suspend(info
->mtd
) == 0)
232 info
->mtd
->resume(info
->mtd
);
235 #define ar91xx_flash_suspend NULL
236 #define ar91xx_flash_resume NULL
237 #define ar91xx_flash_shutdown NULL
240 static struct platform_driver ar91xx_flash_driver
= {
241 .probe
= ar91xx_flash_probe
,
242 .remove
= ar91xx_flash_remove
,
243 .suspend
= ar91xx_flash_suspend
,
244 .resume
= ar91xx_flash_resume
,
245 .shutdown
= ar91xx_flash_shutdown
,
248 .owner
= THIS_MODULE
,
252 static int __init
ar91xx_flash_init(void)
254 return platform_driver_register(&ar91xx_flash_driver
);
257 static void __exit
ar91xx_flash_exit(void)
259 platform_driver_unregister(&ar91xx_flash_driver
);
262 module_init(ar91xx_flash_init
);
263 module_exit(ar91xx_flash_exit
);
265 MODULE_LICENSE("GPL v2");
266 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
267 MODULE_DESCRIPTION("Parallel flash driver for the Atheros AR91xx SoC");
268 MODULE_ALIAS("platform:" DRV_NAME
);