Commit | Line | Data |
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dcfb81d6 DG |
1 | /* |
2 | * Interface for NOR flash driver whose high address lines are latched | |
3 | * | |
4 | * Copyright © 2000 Nicolas Pitre <nico@cam.org> | |
5 | * Copyright © 2005-2008 Analog Devices Inc. | |
6 | * Copyright © 2008 MontaVista Software, Inc. <source@mvista.com> | |
7 | * | |
8 | * This file is licensed under the terms of the GNU General Public License | |
9 | * version 2. This program is licensed "as is" without any warranty of any | |
10 | * kind, whether express or implied. | |
11 | */ | |
12 | ||
13 | #include <linux/init.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/mtd/mtd.h> | |
17 | #include <linux/mtd/map.h> | |
18 | #include <linux/mtd/partitions.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/mtd/latch-addr-flash.h> | |
21 | #include <linux/slab.h> | |
22 | ||
23 | #define DRIVER_NAME "latch-addr-flash" | |
24 | ||
25 | struct latch_addr_flash_info { | |
26 | struct mtd_info *mtd; | |
27 | struct map_info map; | |
28 | struct resource *res; | |
29 | ||
30 | void (*set_window)(unsigned long offset, void *data); | |
31 | void *data; | |
32 | ||
33 | /* cache; could be found out of res */ | |
34 | unsigned long win_mask; | |
35 | ||
dcfb81d6 DG |
36 | spinlock_t lock; |
37 | }; | |
38 | ||
39 | static map_word lf_read(struct map_info *map, unsigned long ofs) | |
40 | { | |
41 | struct latch_addr_flash_info *info; | |
42 | map_word datum; | |
43 | ||
44 | info = (struct latch_addr_flash_info *)map->map_priv_1; | |
45 | ||
46 | spin_lock(&info->lock); | |
47 | ||
48 | info->set_window(ofs, info->data); | |
49 | datum = inline_map_read(map, info->win_mask & ofs); | |
50 | ||
51 | spin_unlock(&info->lock); | |
52 | ||
53 | return datum; | |
54 | } | |
55 | ||
56 | static void lf_write(struct map_info *map, map_word datum, unsigned long ofs) | |
57 | { | |
58 | struct latch_addr_flash_info *info; | |
59 | ||
60 | info = (struct latch_addr_flash_info *)map->map_priv_1; | |
61 | ||
62 | spin_lock(&info->lock); | |
63 | ||
64 | info->set_window(ofs, info->data); | |
65 | inline_map_write(map, datum, info->win_mask & ofs); | |
66 | ||
67 | spin_unlock(&info->lock); | |
68 | } | |
69 | ||
70 | static void lf_copy_from(struct map_info *map, void *to, | |
71 | unsigned long from, ssize_t len) | |
72 | { | |
73 | struct latch_addr_flash_info *info = | |
74 | (struct latch_addr_flash_info *) map->map_priv_1; | |
75 | unsigned n; | |
76 | ||
77 | while (len > 0) { | |
78 | n = info->win_mask + 1 - (from & info->win_mask); | |
79 | if (n > len) | |
80 | n = len; | |
81 | ||
82 | spin_lock(&info->lock); | |
83 | ||
84 | info->set_window(from, info->data); | |
85 | memcpy_fromio(to, map->virt + (from & info->win_mask), n); | |
86 | ||
87 | spin_unlock(&info->lock); | |
88 | ||
89 | to += n; | |
90 | from += n; | |
91 | len -= n; | |
92 | } | |
93 | } | |
94 | ||
95 | static char *rom_probe_types[] = { "cfi_probe", NULL }; | |
96 | ||
dcfb81d6 DG |
97 | static int latch_addr_flash_remove(struct platform_device *dev) |
98 | { | |
99 | struct latch_addr_flash_info *info; | |
100 | struct latch_addr_flash_data *latch_addr_data; | |
101 | ||
102 | info = platform_get_drvdata(dev); | |
103 | if (info == NULL) | |
104 | return 0; | |
105 | platform_set_drvdata(dev, NULL); | |
106 | ||
107 | latch_addr_data = dev->dev.platform_data; | |
108 | ||
109 | if (info->mtd != NULL) { | |
902766bf | 110 | mtd_device_unregister(info->mtd); |
dcfb81d6 DG |
111 | map_destroy(info->mtd); |
112 | } | |
113 | ||
114 | if (info->map.virt != NULL) | |
115 | iounmap(info->map.virt); | |
116 | ||
117 | if (info->res != NULL) | |
118 | release_mem_region(info->res->start, resource_size(info->res)); | |
119 | ||
120 | kfree(info); | |
121 | ||
122 | if (latch_addr_data->done) | |
123 | latch_addr_data->done(latch_addr_data->data); | |
124 | ||
125 | return 0; | |
126 | } | |
127 | ||
128 | static int __devinit latch_addr_flash_probe(struct platform_device *dev) | |
129 | { | |
130 | struct latch_addr_flash_data *latch_addr_data; | |
131 | struct latch_addr_flash_info *info; | |
132 | resource_size_t win_base = dev->resource->start; | |
133 | resource_size_t win_size = resource_size(dev->resource); | |
134 | char **probe_type; | |
135 | int chipsel; | |
136 | int err; | |
137 | ||
138 | latch_addr_data = dev->dev.platform_data; | |
139 | if (latch_addr_data == NULL) | |
140 | return -ENODEV; | |
141 | ||
142 | pr_notice("latch-addr platform flash device: %#llx byte " | |
143 | "window at %#.8llx\n", | |
144 | (unsigned long long)win_size, (unsigned long long)win_base); | |
145 | ||
146 | chipsel = dev->id; | |
147 | ||
148 | if (latch_addr_data->init) { | |
149 | err = latch_addr_data->init(latch_addr_data->data, chipsel); | |
150 | if (err != 0) | |
151 | return err; | |
152 | } | |
153 | ||
154 | info = kzalloc(sizeof(struct latch_addr_flash_info), GFP_KERNEL); | |
155 | if (info == NULL) { | |
156 | err = -ENOMEM; | |
157 | goto done; | |
158 | } | |
159 | ||
160 | platform_set_drvdata(dev, info); | |
161 | ||
162 | info->res = request_mem_region(win_base, win_size, DRIVER_NAME); | |
163 | if (info->res == NULL) { | |
164 | dev_err(&dev->dev, "Could not reserve memory region\n"); | |
165 | err = -EBUSY; | |
166 | goto free_info; | |
167 | } | |
168 | ||
169 | info->map.name = DRIVER_NAME; | |
170 | info->map.size = latch_addr_data->size; | |
171 | info->map.bankwidth = latch_addr_data->width; | |
172 | ||
173 | info->map.phys = NO_XIP; | |
174 | info->map.virt = ioremap(win_base, win_size); | |
175 | if (!info->map.virt) { | |
176 | err = -ENOMEM; | |
177 | goto free_res; | |
178 | } | |
179 | ||
180 | info->map.map_priv_1 = (unsigned long)info; | |
181 | ||
182 | info->map.read = lf_read; | |
183 | info->map.copy_from = lf_copy_from; | |
184 | info->map.write = lf_write; | |
185 | info->set_window = latch_addr_data->set_window; | |
186 | info->data = latch_addr_data->data; | |
187 | info->win_mask = win_size - 1; | |
188 | ||
189 | spin_lock_init(&info->lock); | |
190 | ||
191 | for (probe_type = rom_probe_types; !info->mtd && *probe_type; | |
192 | probe_type++) | |
193 | info->mtd = do_map_probe(*probe_type, &info->map); | |
194 | ||
195 | if (info->mtd == NULL) { | |
196 | dev_err(&dev->dev, "map_probe failed\n"); | |
197 | err = -ENODEV; | |
198 | goto iounmap; | |
199 | } | |
200 | info->mtd->owner = THIS_MODULE; | |
201 | ||
42d7fbe2 AB |
202 | mtd_device_parse_register(info->mtd, NULL, NULL, |
203 | latch_addr_data->parts, | |
204 | latch_addr_data->nr_parts); | |
dcfb81d6 DG |
205 | return 0; |
206 | ||
207 | iounmap: | |
208 | iounmap(info->map.virt); | |
209 | free_res: | |
210 | release_mem_region(info->res->start, resource_size(info->res)); | |
211 | free_info: | |
212 | kfree(info); | |
213 | done: | |
214 | if (latch_addr_data->done) | |
215 | latch_addr_data->done(latch_addr_data->data); | |
216 | return err; | |
217 | } | |
218 | ||
219 | static struct platform_driver latch_addr_flash_driver = { | |
220 | .probe = latch_addr_flash_probe, | |
221 | .remove = __devexit_p(latch_addr_flash_remove), | |
222 | .driver = { | |
223 | .name = DRIVER_NAME, | |
224 | }, | |
225 | }; | |
226 | ||
f99640de | 227 | module_platform_driver(latch_addr_flash_driver); |
dcfb81d6 DG |
228 | |
229 | MODULE_AUTHOR("David Griego <dgriego@mvista.com>"); | |
230 | MODULE_DESCRIPTION("MTD map driver for flashes addressed physically with upper " | |
231 | "address lines being set board specifically"); | |
232 | MODULE_LICENSE("GPL v2"); |