Merge tag 'ktest-v3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...
[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / mtd / maps / latch-addr-flash.c
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
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
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
106         latch_addr_data = dev_get_platdata(&dev->dev);
107
108         if (info->mtd != NULL) {
109                 mtd_device_unregister(info->mtd);
110                 map_destroy(info->mtd);
111         }
112
113         if (info->map.virt != NULL)
114                 iounmap(info->map.virt);
115
116         if (info->res != NULL)
117                 release_mem_region(info->res->start, resource_size(info->res));
118
119         kfree(info);
120
121         if (latch_addr_data->done)
122                 latch_addr_data->done(latch_addr_data->data);
123
124         return 0;
125 }
126
127 static int latch_addr_flash_probe(struct platform_device *dev)
128 {
129         struct latch_addr_flash_data *latch_addr_data;
130         struct latch_addr_flash_info *info;
131         resource_size_t win_base = dev->resource->start;
132         resource_size_t win_size = resource_size(dev->resource);
133         char **probe_type;
134         int chipsel;
135         int err;
136
137         latch_addr_data = dev_get_platdata(&dev->dev);
138         if (latch_addr_data == NULL)
139                 return -ENODEV;
140
141         pr_notice("latch-addr platform flash device: %#llx byte "
142                   "window at %#.8llx\n",
143                   (unsigned long long)win_size, (unsigned long long)win_base);
144
145         chipsel = dev->id;
146
147         if (latch_addr_data->init) {
148                 err = latch_addr_data->init(latch_addr_data->data, chipsel);
149                 if (err != 0)
150                         return err;
151         }
152
153         info = kzalloc(sizeof(struct latch_addr_flash_info), GFP_KERNEL);
154         if (info == NULL) {
155                 err = -ENOMEM;
156                 goto done;
157         }
158
159         platform_set_drvdata(dev, info);
160
161         info->res = request_mem_region(win_base, win_size, DRIVER_NAME);
162         if (info->res == NULL) {
163                 dev_err(&dev->dev, "Could not reserve memory region\n");
164                 err = -EBUSY;
165                 goto free_info;
166         }
167
168         info->map.name          = DRIVER_NAME;
169         info->map.size          = latch_addr_data->size;
170         info->map.bankwidth     = latch_addr_data->width;
171
172         info->map.phys          = NO_XIP;
173         info->map.virt          = ioremap(win_base, win_size);
174         if (!info->map.virt) {
175                 err = -ENOMEM;
176                 goto free_res;
177         }
178
179         info->map.map_priv_1    = (unsigned long)info;
180
181         info->map.read          = lf_read;
182         info->map.copy_from     = lf_copy_from;
183         info->map.write         = lf_write;
184         info->set_window        = latch_addr_data->set_window;
185         info->data              = latch_addr_data->data;
186         info->win_mask          = win_size - 1;
187
188         spin_lock_init(&info->lock);
189
190         for (probe_type = rom_probe_types; !info->mtd && *probe_type;
191                 probe_type++)
192                 info->mtd = do_map_probe(*probe_type, &info->map);
193
194         if (info->mtd == NULL) {
195                 dev_err(&dev->dev, "map_probe failed\n");
196                 err = -ENODEV;
197                 goto iounmap;
198         }
199         info->mtd->owner = THIS_MODULE;
200
201         mtd_device_parse_register(info->mtd, NULL, NULL,
202                                   latch_addr_data->parts,
203                                   latch_addr_data->nr_parts);
204         return 0;
205
206 iounmap:
207         iounmap(info->map.virt);
208 free_res:
209         release_mem_region(info->res->start, resource_size(info->res));
210 free_info:
211         kfree(info);
212 done:
213         if (latch_addr_data->done)
214                 latch_addr_data->done(latch_addr_data->data);
215         return err;
216 }
217
218 static struct platform_driver latch_addr_flash_driver = {
219         .probe          = latch_addr_flash_probe,
220         .remove         = latch_addr_flash_remove,
221         .driver         = {
222                 .name   = DRIVER_NAME,
223         },
224 };
225
226 module_platform_driver(latch_addr_flash_driver);
227
228 MODULE_AUTHOR("David Griego <dgriego@mvista.com>");
229 MODULE_DESCRIPTION("MTD map driver for flashes addressed physically with upper "
230                 "address lines being set board specifically");
231 MODULE_LICENSE("GPL v2");