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