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Linux/drivers/mtd/maps/physmap.c

  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 
 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 
 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 
 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]->owner = THIS_MODULE;
171                 info->mtd[i]->dev.parent = &dev->dev;
172         }
173 
174         if (devices_found == 1) {
175                 info->cmtd = info->mtd[0];
176         } else if (devices_found > 1) {
177                 /*
178                  * We detected multiple devices. Concatenate them together.
179                  */
180                 info->cmtd = mtd_concat_create(info->mtd, devices_found, dev_name(&dev->dev));
181                 if (info->cmtd == NULL)
182                         err = -ENXIO;
183         }
184         if (err)
185                 goto err_out;
186 
187         spin_lock_init(&info->vpp_lock);
188 
189         part_types = physmap_data->part_probe_types ? : part_probe_types;
190 
191         mtd_device_parse_register(info->cmtd, part_types, NULL,
192                                   physmap_data->parts, physmap_data->nr_parts);
193         return 0;
194 
195 err_out:
196         physmap_flash_remove(dev);
197         return err;
198 }
199 
200 #ifdef CONFIG_PM
201 static void physmap_flash_shutdown(struct platform_device *dev)
202 {
203         struct physmap_flash_info *info = platform_get_drvdata(dev);
204         int i;
205 
206         for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
207                 if (mtd_suspend(info->mtd[i]) == 0)
208                         mtd_resume(info->mtd[i]);
209 }
210 #else
211 #define physmap_flash_shutdown NULL
212 #endif
213 
214 static struct platform_driver physmap_flash_driver = {
215         .probe          = physmap_flash_probe,
216         .remove         = physmap_flash_remove,
217         .shutdown       = physmap_flash_shutdown,
218         .driver         = {
219                 .name   = "physmap-flash",
220                 .owner  = THIS_MODULE,
221         },
222 };
223 
224 
225 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
226 static struct physmap_flash_data physmap_flash_data = {
227         .width          = CONFIG_MTD_PHYSMAP_BANKWIDTH,
228 };
229 
230 static struct resource physmap_flash_resource = {
231         .start          = CONFIG_MTD_PHYSMAP_START,
232         .end            = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
233         .flags          = IORESOURCE_MEM,
234 };
235 
236 static struct platform_device physmap_flash = {
237         .name           = "physmap-flash",
238         .id             = 0,
239         .dev            = {
240                 .platform_data  = &physmap_flash_data,
241         },
242         .num_resources  = 1,
243         .resource       = &physmap_flash_resource,
244 };
245 #endif
246 
247 static int __init physmap_init(void)
248 {
249         int err;
250 
251         err = platform_driver_register(&physmap_flash_driver);
252 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
253         if (err == 0) {
254                 err = platform_device_register(&physmap_flash);
255                 if (err)
256                         platform_driver_unregister(&physmap_flash_driver);
257         }
258 #endif
259 
260         return err;
261 }
262 
263 static void __exit physmap_exit(void)
264 {
265 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
266         platform_device_unregister(&physmap_flash);
267 #endif
268         platform_driver_unregister(&physmap_flash_driver);
269 }
270 
271 module_init(physmap_init);
272 module_exit(physmap_exit);
273 
274 MODULE_LICENSE("GPL");
275 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
276 MODULE_DESCRIPTION("Generic configurable MTD map driver");
277 
278 /* legacy platform drivers can't hotplug or coldplg */
279 #ifndef CONFIG_MTD_PHYSMAP_COMPAT
280 /* work with hotplug and coldplug */
281 MODULE_ALIAS("platform:physmap-flash");
282 #endif
283 

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