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1da177e4 LT |
1 | /*====================================================================== |
2 | ||
3 | drivers/mtd/maps/integrator-flash.c: ARM Integrator flash map driver | |
4 | ||
5 | Copyright (C) 2000 ARM Limited | |
6 | Copyright (C) 2003 Deep Blue Solutions Ltd. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | ||
22 | This is access code for flashes using ARM's flash partitioning | |
23 | standards. | |
24 | ||
25 | $Id: integrator-flash.c,v 1.18 2004/11/01 13:26:15 rmk Exp $ | |
26 | ||
27 | ======================================================================*/ | |
28 | ||
29 | #include <linux/config.h> | |
30 | #include <linux/module.h> | |
31 | #include <linux/types.h> | |
32 | #include <linux/kernel.h> | |
33 | #include <linux/slab.h> | |
34 | #include <linux/ioport.h> | |
35 | #include <linux/device.h> | |
36 | #include <linux/init.h> | |
37 | ||
38 | #include <linux/mtd/mtd.h> | |
39 | #include <linux/mtd/map.h> | |
40 | #include <linux/mtd/partitions.h> | |
41 | ||
42 | #include <asm/mach/flash.h> | |
43 | #include <asm/hardware.h> | |
44 | #include <asm/io.h> | |
45 | #include <asm/system.h> | |
46 | ||
47 | #ifdef CONFIG_ARCH_P720T | |
48 | #define FLASH_BASE (0x04000000) | |
49 | #define FLASH_SIZE (64*1024*1024) | |
50 | #endif | |
51 | ||
52 | struct armflash_info { | |
53 | struct flash_platform_data *plat; | |
54 | struct resource *res; | |
55 | struct mtd_partition *parts; | |
56 | struct mtd_info *mtd; | |
57 | struct map_info map; | |
58 | }; | |
59 | ||
60 | static void armflash_set_vpp(struct map_info *map, int on) | |
61 | { | |
62 | struct armflash_info *info = container_of(map, struct armflash_info, map); | |
63 | ||
64 | if (info->plat && info->plat->set_vpp) | |
65 | info->plat->set_vpp(on); | |
66 | } | |
67 | ||
68 | static const char *probes[] = { "cmdlinepart", "RedBoot", "afs", NULL }; | |
69 | ||
70 | static int armflash_probe(struct device *_dev) | |
71 | { | |
72 | struct platform_device *dev = to_platform_device(_dev); | |
73 | struct flash_platform_data *plat = dev->dev.platform_data; | |
74 | struct resource *res = dev->resource; | |
75 | unsigned int size = res->end - res->start + 1; | |
76 | struct armflash_info *info; | |
77 | int err; | |
78 | void __iomem *base; | |
79 | ||
80 | info = kmalloc(sizeof(struct armflash_info), GFP_KERNEL); | |
81 | if (!info) { | |
82 | err = -ENOMEM; | |
83 | goto out; | |
84 | } | |
85 | ||
86 | memset(info, 0, sizeof(struct armflash_info)); | |
87 | ||
88 | info->plat = plat; | |
89 | if (plat && plat->init) { | |
90 | err = plat->init(); | |
91 | if (err) | |
92 | goto no_resource; | |
93 | } | |
94 | ||
95 | info->res = request_mem_region(res->start, size, "armflash"); | |
96 | if (!info->res) { | |
97 | err = -EBUSY; | |
98 | goto no_resource; | |
99 | } | |
100 | ||
101 | base = ioremap(res->start, size); | |
102 | if (!base) { | |
103 | err = -ENOMEM; | |
104 | goto no_mem; | |
105 | } | |
106 | ||
107 | /* | |
108 | * look for CFI based flash parts fitted to this board | |
109 | */ | |
110 | info->map.size = size; | |
111 | info->map.bankwidth = plat->width; | |
112 | info->map.phys = res->start; | |
113 | info->map.virt = base; | |
114 | info->map.name = dev->dev.bus_id; | |
115 | info->map.set_vpp = armflash_set_vpp; | |
116 | ||
117 | simple_map_init(&info->map); | |
118 | ||
119 | /* | |
120 | * Also, the CFI layer automatically works out what size | |
121 | * of chips we have, and does the necessary identification | |
122 | * for us automatically. | |
123 | */ | |
124 | info->mtd = do_map_probe(plat->map_name, &info->map); | |
125 | if (!info->mtd) { | |
126 | err = -ENXIO; | |
127 | goto no_device; | |
128 | } | |
129 | ||
130 | info->mtd->owner = THIS_MODULE; | |
131 | ||
132 | err = parse_mtd_partitions(info->mtd, probes, &info->parts, 0); | |
133 | if (err > 0) { | |
134 | err = add_mtd_partitions(info->mtd, info->parts, err); | |
135 | if (err) | |
136 | printk(KERN_ERR | |
137 | "mtd partition registration failed: %d\n", err); | |
138 | } | |
139 | ||
140 | if (err == 0) | |
141 | dev_set_drvdata(&dev->dev, info); | |
142 | ||
143 | /* | |
144 | * If we got an error, free all resources. | |
145 | */ | |
146 | if (err < 0) { | |
147 | if (info->mtd) { | |
148 | del_mtd_partitions(info->mtd); | |
149 | map_destroy(info->mtd); | |
150 | } | |
151 | if (info->parts) | |
152 | kfree(info->parts); | |
153 | ||
154 | no_device: | |
155 | iounmap(base); | |
156 | no_mem: | |
157 | release_mem_region(res->start, size); | |
158 | no_resource: | |
159 | if (plat && plat->exit) | |
160 | plat->exit(); | |
161 | kfree(info); | |
162 | } | |
163 | out: | |
164 | return err; | |
165 | } | |
166 | ||
167 | static int armflash_remove(struct device *_dev) | |
168 | { | |
169 | struct platform_device *dev = to_platform_device(_dev); | |
170 | struct armflash_info *info = dev_get_drvdata(&dev->dev); | |
171 | ||
172 | dev_set_drvdata(&dev->dev, NULL); | |
173 | ||
174 | if (info) { | |
175 | if (info->mtd) { | |
176 | del_mtd_partitions(info->mtd); | |
177 | map_destroy(info->mtd); | |
178 | } | |
179 | if (info->parts) | |
180 | kfree(info->parts); | |
181 | ||
182 | iounmap(info->map.virt); | |
183 | release_resource(info->res); | |
184 | kfree(info->res); | |
185 | ||
186 | if (info->plat && info->plat->exit) | |
187 | info->plat->exit(); | |
188 | ||
189 | kfree(info); | |
190 | } | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
195 | static struct device_driver armflash_driver = { | |
196 | .name = "armflash", | |
197 | .bus = &platform_bus_type, | |
198 | .probe = armflash_probe, | |
199 | .remove = armflash_remove, | |
200 | }; | |
201 | ||
202 | static int __init armflash_init(void) | |
203 | { | |
204 | return driver_register(&armflash_driver); | |
205 | } | |
206 | ||
207 | static void __exit armflash_exit(void) | |
208 | { | |
209 | driver_unregister(&armflash_driver); | |
210 | } | |
211 | ||
212 | module_init(armflash_init); | |
213 | module_exit(armflash_exit); | |
214 | ||
215 | MODULE_AUTHOR("ARM Ltd"); | |
216 | MODULE_DESCRIPTION("ARM Integrator CFI map driver"); | |
217 | MODULE_LICENSE("GPL"); |