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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 | ||
dcfb81d6 DG |
13 | #include <linux/kernel.h> |
14 | #include <linux/module.h> | |
15 | #include <linux/mtd/mtd.h> | |
16 | #include <linux/mtd/map.h> | |
17 | #include <linux/mtd/partitions.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/mtd/latch-addr-flash.h> | |
20 | #include <linux/slab.h> | |
21 | ||
22 | #define DRIVER_NAME "latch-addr-flash" | |
23 | ||
24 | struct latch_addr_flash_info { | |
25 | struct mtd_info *mtd; | |
26 | struct map_info map; | |
27 | struct resource *res; | |
28 | ||
29 | void (*set_window)(unsigned long offset, void *data); | |
30 | void *data; | |
31 | ||
32 | /* cache; could be found out of res */ | |
33 | unsigned long win_mask; | |
34 | ||
dcfb81d6 DG |
35 | spinlock_t lock; |
36 | }; | |
37 | ||
38 | static map_word lf_read(struct map_info *map, unsigned long ofs) | |
39 | { | |
40 | struct latch_addr_flash_info *info; | |
41 | map_word datum; | |
42 | ||
43 | info = (struct latch_addr_flash_info *)map->map_priv_1; | |
44 | ||
45 | spin_lock(&info->lock); | |
46 | ||
47 | info->set_window(ofs, info->data); | |
48 | datum = inline_map_read(map, info->win_mask & ofs); | |
49 | ||
50 | spin_unlock(&info->lock); | |
51 | ||
52 | return datum; | |
53 | } | |
54 | ||
55 | static void lf_write(struct map_info *map, map_word datum, unsigned long ofs) | |
56 | { | |
57 | struct latch_addr_flash_info *info; | |
58 | ||
59 | info = (struct latch_addr_flash_info *)map->map_priv_1; | |
60 | ||
61 | spin_lock(&info->lock); | |
62 | ||
63 | info->set_window(ofs, info->data); | |
64 | inline_map_write(map, datum, info->win_mask & ofs); | |
65 | ||
66 | spin_unlock(&info->lock); | |
67 | } | |
68 | ||
69 | static void lf_copy_from(struct map_info *map, void *to, | |
70 | unsigned long from, ssize_t len) | |
71 | { | |
72 | struct latch_addr_flash_info *info = | |
73 | (struct latch_addr_flash_info *) map->map_priv_1; | |
74 | unsigned n; | |
75 | ||
76 | while (len > 0) { | |
77 | n = info->win_mask + 1 - (from & info->win_mask); | |
78 | if (n > len) | |
79 | n = len; | |
80 | ||
81 | spin_lock(&info->lock); | |
82 | ||
83 | info->set_window(from, info->data); | |
84 | memcpy_fromio(to, map->virt + (from & info->win_mask), n); | |
85 | ||
86 | spin_unlock(&info->lock); | |
87 | ||
88 | to += n; | |
89 | from += n; | |
90 | len -= n; | |
91 | } | |
92 | } | |
93 | ||
94 | static char *rom_probe_types[] = { "cfi_probe", NULL }; | |
95 | ||
dcfb81d6 DG |
96 | static int latch_addr_flash_remove(struct platform_device *dev) |
97 | { | |
98 | struct latch_addr_flash_info *info; | |
99 | struct latch_addr_flash_data *latch_addr_data; | |
100 | ||
101 | info = platform_get_drvdata(dev); | |
102 | if (info == NULL) | |
103 | return 0; | |
dcfb81d6 | 104 | |
d20d5a57 | 105 | latch_addr_data = dev_get_platdata(&dev->dev); |
dcfb81d6 DG |
106 | |
107 | if (info->mtd != NULL) { | |
902766bf | 108 | mtd_device_unregister(info->mtd); |
dcfb81d6 DG |
109 | map_destroy(info->mtd); |
110 | } | |
111 | ||
112 | if (info->map.virt != NULL) | |
113 | iounmap(info->map.virt); | |
114 | ||
115 | if (info->res != NULL) | |
116 | release_mem_region(info->res->start, resource_size(info->res)); | |
117 | ||
118 | kfree(info); | |
119 | ||
120 | if (latch_addr_data->done) | |
121 | latch_addr_data->done(latch_addr_data->data); | |
122 | ||
123 | return 0; | |
124 | } | |
125 | ||
06f25510 | 126 | static int latch_addr_flash_probe(struct platform_device *dev) |
dcfb81d6 DG |
127 | { |
128 | struct latch_addr_flash_data *latch_addr_data; | |
129 | struct latch_addr_flash_info *info; | |
130 | resource_size_t win_base = dev->resource->start; | |
131 | resource_size_t win_size = resource_size(dev->resource); | |
132 | char **probe_type; | |
133 | int chipsel; | |
134 | int err; | |
135 | ||
d20d5a57 | 136 | latch_addr_data = dev_get_platdata(&dev->dev); |
dcfb81d6 DG |
137 | if (latch_addr_data == NULL) |
138 | return -ENODEV; | |
139 | ||
140 | pr_notice("latch-addr platform flash device: %#llx byte " | |
141 | "window at %#.8llx\n", | |
142 | (unsigned long long)win_size, (unsigned long long)win_base); | |
143 | ||
144 | chipsel = dev->id; | |
145 | ||
146 | if (latch_addr_data->init) { | |
147 | err = latch_addr_data->init(latch_addr_data->data, chipsel); | |
148 | if (err != 0) | |
149 | return err; | |
150 | } | |
151 | ||
152 | info = kzalloc(sizeof(struct latch_addr_flash_info), GFP_KERNEL); | |
153 | if (info == NULL) { | |
154 | err = -ENOMEM; | |
155 | goto done; | |
156 | } | |
157 | ||
158 | platform_set_drvdata(dev, info); | |
159 | ||
160 | info->res = request_mem_region(win_base, win_size, DRIVER_NAME); | |
161 | if (info->res == NULL) { | |
162 | dev_err(&dev->dev, "Could not reserve memory region\n"); | |
163 | err = -EBUSY; | |
164 | goto free_info; | |
165 | } | |
166 | ||
167 | info->map.name = DRIVER_NAME; | |
168 | info->map.size = latch_addr_data->size; | |
169 | info->map.bankwidth = latch_addr_data->width; | |
170 | ||
171 | info->map.phys = NO_XIP; | |
172 | info->map.virt = ioremap(win_base, win_size); | |
173 | if (!info->map.virt) { | |
174 | err = -ENOMEM; | |
175 | goto free_res; | |
176 | } | |
177 | ||
178 | info->map.map_priv_1 = (unsigned long)info; | |
179 | ||
180 | info->map.read = lf_read; | |
181 | info->map.copy_from = lf_copy_from; | |
182 | info->map.write = lf_write; | |
183 | info->set_window = latch_addr_data->set_window; | |
184 | info->data = latch_addr_data->data; | |
185 | info->win_mask = win_size - 1; | |
186 | ||
187 | spin_lock_init(&info->lock); | |
188 | ||
189 | for (probe_type = rom_probe_types; !info->mtd && *probe_type; | |
190 | probe_type++) | |
191 | info->mtd = do_map_probe(*probe_type, &info->map); | |
192 | ||
193 | if (info->mtd == NULL) { | |
194 | dev_err(&dev->dev, "map_probe failed\n"); | |
195 | err = -ENODEV; | |
196 | goto iounmap; | |
197 | } | |
198 | info->mtd->owner = THIS_MODULE; | |
199 | ||
42d7fbe2 AB |
200 | mtd_device_parse_register(info->mtd, NULL, NULL, |
201 | latch_addr_data->parts, | |
202 | latch_addr_data->nr_parts); | |
dcfb81d6 DG |
203 | return 0; |
204 | ||
205 | iounmap: | |
206 | iounmap(info->map.virt); | |
207 | free_res: | |
208 | release_mem_region(info->res->start, resource_size(info->res)); | |
209 | free_info: | |
210 | kfree(info); | |
211 | done: | |
212 | if (latch_addr_data->done) | |
213 | latch_addr_data->done(latch_addr_data->data); | |
214 | return err; | |
215 | } | |
216 | ||
217 | static struct platform_driver latch_addr_flash_driver = { | |
218 | .probe = latch_addr_flash_probe, | |
5153b88c | 219 | .remove = latch_addr_flash_remove, |
dcfb81d6 DG |
220 | .driver = { |
221 | .name = DRIVER_NAME, | |
222 | }, | |
223 | }; | |
224 | ||
f99640de | 225 | module_platform_driver(latch_addr_flash_driver); |
dcfb81d6 DG |
226 | |
227 | MODULE_AUTHOR("David Griego <dgriego@mvista.com>"); | |
228 | MODULE_DESCRIPTION("MTD map driver for flashes addressed physically with upper " | |
229 | "address lines being set board specifically"); | |
230 | MODULE_LICENSE("GPL v2"); |