1 /*
2 * Normal mappings of chips in physical memory
3 *
4 * Copyright (C) 2003 MontaVista Software Inc.
5 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
6 *
7 * 031022 - [jsun] add run-time configure and partition setup
8 */
9
10 #include <linux/module.h>
11 #include <linux/types.h>
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/slab.h>
15 #include <linux/device.h>
16 #include <linux/platform_device.h>
17 #include <linux/mtd/mtd.h>
18 #include <linux/mtd/map.h>
19 #include <linux/mtd/partitions.h>
20 #include <linux/mtd/physmap.h>
21 #include <linux/mtd/concat.h>
22 #include <linux/io.h>
23
24 #define MAX_RESOURCES 4
25
26 struct physmap_flash_info {
27 struct mtd_info *mtd[MAX_RESOURCES];
28 struct mtd_info *cmtd;
29 struct map_info map[MAX_RESOURCES];
30 spinlock_t vpp_lock;
31 int vpp_refcnt;
32 };
33
physmap_flash_remove(struct platform_device * dev)34 static int physmap_flash_remove(struct platform_device *dev)
35 {
36 struct physmap_flash_info *info;
37 struct physmap_flash_data *physmap_data;
38 int i;
39
40 info = platform_get_drvdata(dev);
41 if (info == NULL)
42 return 0;
43
44 physmap_data = dev_get_platdata(&dev->dev);
45
46 if (info->cmtd) {
47 mtd_device_unregister(info->cmtd);
48 if (info->cmtd != info->mtd[0])
49 mtd_concat_destroy(info->cmtd);
50 }
51
52 for (i = 0; i < MAX_RESOURCES; i++) {
53 if (info->mtd[i] != NULL)
54 map_destroy(info->mtd[i]);
55 }
56
57 if (physmap_data->exit)
58 physmap_data->exit(dev);
59
60 return 0;
61 }
62
physmap_set_vpp(struct map_info * map,int state)63 static void physmap_set_vpp(struct map_info *map, int state)
64 {
65 struct platform_device *pdev;
66 struct physmap_flash_data *physmap_data;
67 struct physmap_flash_info *info;
68 unsigned long flags;
69
70 pdev = (struct platform_device *)map->map_priv_1;
71 physmap_data = dev_get_platdata(&pdev->dev);
72
73 if (!physmap_data->set_vpp)
74 return;
75
76 info = platform_get_drvdata(pdev);
77
78 spin_lock_irqsave(&info->vpp_lock, flags);
79 if (state) {
80 if (++info->vpp_refcnt == 1) /* first nested 'on' */
81 physmap_data->set_vpp(pdev, 1);
82 } else {
83 if (--info->vpp_refcnt == 0) /* last nested 'off' */
84 physmap_data->set_vpp(pdev, 0);
85 }
86 spin_unlock_irqrestore(&info->vpp_lock, flags);
87 }
88
89 static const char * const rom_probe_types[] = {
90 "cfi_probe", "jedec_probe", "qinfo_probe", "map_rom", NULL };
91
92 static const char * const part_probe_types[] = {
93 "cmdlinepart", "RedBoot", "afs", NULL };
94
physmap_flash_probe(struct platform_device * dev)95 static int physmap_flash_probe(struct platform_device *dev)
96 {
97 struct physmap_flash_data *physmap_data;
98 struct physmap_flash_info *info;
99 const char * const *probe_type;
100 const char * const *part_types;
101 int err = 0;
102 int i;
103 int devices_found = 0;
104
105 physmap_data = dev_get_platdata(&dev->dev);
106 if (physmap_data == NULL)
107 return -ENODEV;
108
109 info = devm_kzalloc(&dev->dev, sizeof(struct physmap_flash_info),
110 GFP_KERNEL);
111 if (info == NULL) {
112 err = -ENOMEM;
113 goto err_out;
114 }
115
116 if (physmap_data->init) {
117 err = physmap_data->init(dev);
118 if (err)
119 goto err_out;
120 }
121
122 platform_set_drvdata(dev, info);
123
124 for (i = 0; i < dev->num_resources; i++) {
125 printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
126 (unsigned long long)resource_size(&dev->resource[i]),
127 (unsigned long long)dev->resource[i].start);
128
129 if (!devm_request_mem_region(&dev->dev,
130 dev->resource[i].start,
131 resource_size(&dev->resource[i]),
132 dev_name(&dev->dev))) {
133 dev_err(&dev->dev, "Could not reserve memory region\n");
134 err = -ENOMEM;
135 goto err_out;
136 }
137
138 info->map[i].name = dev_name(&dev->dev);
139 info->map[i].phys = dev->resource[i].start;
140 info->map[i].size = resource_size(&dev->resource[i]);
141 info->map[i].bankwidth = physmap_data->width;
142 info->map[i].set_vpp = physmap_set_vpp;
143 info->map[i].pfow_base = physmap_data->pfow_base;
144 info->map[i].map_priv_1 = (unsigned long)dev;
145
146 info->map[i].virt = devm_ioremap(&dev->dev, info->map[i].phys,
147 info->map[i].size);
148 if (info->map[i].virt == NULL) {
149 dev_err(&dev->dev, "Failed to ioremap flash region\n");
150 err = -EIO;
151 goto err_out;
152 }
153
154 simple_map_init(&info->map[i]);
155
156 probe_type = rom_probe_types;
157 if (physmap_data->probe_type == NULL) {
158 for (; info->mtd[i] == NULL && *probe_type != NULL; probe_type++)
159 info->mtd[i] = do_map_probe(*probe_type, &info->map[i]);
160 } else
161 info->mtd[i] = do_map_probe(physmap_data->probe_type, &info->map[i]);
162
163 if (info->mtd[i] == NULL) {
164 dev_err(&dev->dev, "map_probe failed\n");
165 err = -ENXIO;
166 goto err_out;
167 } else {
168 devices_found++;
169 }
170 info->mtd[i]->dev.parent = &dev->dev;
171 }
172
173 if (devices_found == 1) {
174 info->cmtd = info->mtd[0];
175 } else if (devices_found > 1) {
176 /*
177 * We detected multiple devices. Concatenate them together.
178 */
179 info->cmtd = mtd_concat_create(info->mtd, devices_found, dev_name(&dev->dev));
180 if (info->cmtd == NULL)
181 err = -ENXIO;
182 }
183 if (err)
184 goto err_out;
185
186 spin_lock_init(&info->vpp_lock);
187
188 part_types = physmap_data->part_probe_types ? : part_probe_types;
189
190 mtd_device_parse_register(info->cmtd, part_types, NULL,
191 physmap_data->parts, physmap_data->nr_parts);
192 return 0;
193
194 err_out:
195 physmap_flash_remove(dev);
196 return err;
197 }
198
199 #ifdef CONFIG_PM
physmap_flash_shutdown(struct platform_device * dev)200 static void physmap_flash_shutdown(struct platform_device *dev)
201 {
202 struct physmap_flash_info *info = platform_get_drvdata(dev);
203 int i;
204
205 for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
206 if (mtd_suspend(info->mtd[i]) == 0)
207 mtd_resume(info->mtd[i]);
208 }
209 #else
210 #define physmap_flash_shutdown NULL
211 #endif
212
213 static struct platform_driver physmap_flash_driver = {
214 .probe = physmap_flash_probe,
215 .remove = physmap_flash_remove,
216 .shutdown = physmap_flash_shutdown,
217 .driver = {
218 .name = "physmap-flash",
219 },
220 };
221
222
223 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
224 static struct physmap_flash_data physmap_flash_data = {
225 .width = CONFIG_MTD_PHYSMAP_BANKWIDTH,
226 };
227
228 static struct resource physmap_flash_resource = {
229 .start = CONFIG_MTD_PHYSMAP_START,
230 .end = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
231 .flags = IORESOURCE_MEM,
232 };
233
234 static struct platform_device physmap_flash = {
235 .name = "physmap-flash",
236 .id = 0,
237 .dev = {
238 .platform_data = &physmap_flash_data,
239 },
240 .num_resources = 1,
241 .resource = &physmap_flash_resource,
242 };
243 #endif
244
physmap_init(void)245 static int __init physmap_init(void)
246 {
247 int err;
248
249 err = platform_driver_register(&physmap_flash_driver);
250 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
251 if (err == 0) {
252 err = platform_device_register(&physmap_flash);
253 if (err)
254 platform_driver_unregister(&physmap_flash_driver);
255 }
256 #endif
257
258 return err;
259 }
260
physmap_exit(void)261 static void __exit physmap_exit(void)
262 {
263 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
264 platform_device_unregister(&physmap_flash);
265 #endif
266 platform_driver_unregister(&physmap_flash_driver);
267 }
268
269 module_init(physmap_init);
270 module_exit(physmap_exit);
271
272 MODULE_LICENSE("GPL");
273 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
274 MODULE_DESCRIPTION("Generic configurable MTD map driver");
275
276 /* legacy platform drivers can't hotplug or coldplg */
277 #ifndef CONFIG_MTD_PHYSMAP_COMPAT
278 /* work with hotplug and coldplug */
279 MODULE_ALIAS("platform:physmap-flash");
280 #endif
281
