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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
25struct 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
34 unsigned long win_mask;
35
36 spinlock_t lock;
37};
38
39static 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
56static 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
70static 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
95static char *rom_probe_types[] = { "cfi_probe", NULL };
96
97static 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) {
110 mtd_device_unregister(info->mtd);
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
128static int 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
202 mtd_device_parse_register(info->mtd, NULL, NULL,
203 latch_addr_data->parts,
204 latch_addr_data->nr_parts);
205 return 0;
206
207iounmap:
208 iounmap(info->map.virt);
209free_res:
210 release_mem_region(info->res->start, resource_size(info->res));
211free_info:
212 kfree(info);
213done:
214 if (latch_addr_data->done)
215 latch_addr_data->done(latch_addr_data->data);
216 return err;
217}
218
219static struct platform_driver latch_addr_flash_driver = {
220 .probe = latch_addr_flash_probe,
221 .remove = latch_addr_flash_remove,
222 .driver = {
223 .name = DRIVER_NAME,
224 },
225};
226
227module_platform_driver(latch_addr_flash_driver);
228
229MODULE_AUTHOR("David Griego <dgriego@mvista.com>");
230MODULE_DESCRIPTION("MTD map driver for flashes addressed physically with upper "
231 "address lines being set board specifically");
232MODULE_LICENSE("GPL v2");
233
