Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Flash memory access on SA11x0 based devices | |
3 | * | |
4 | * (C) 2000 Nicolas Pitre <nico@cam.org> | |
5 | * | |
6 | * $Id: sa1100-flash.c,v 1.47 2004/11/01 13:44:36 rmk Exp $ | |
7 | */ | |
8 | #include <linux/config.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/types.h> | |
11 | #include <linux/ioport.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/slab.h> | |
d052d1be | 16 | #include <linux/platform_device.h> |
1da177e4 LT |
17 | #include <linux/err.h> |
18 | ||
19 | #include <linux/mtd/mtd.h> | |
20 | #include <linux/mtd/map.h> | |
21 | #include <linux/mtd/partitions.h> | |
22 | #include <linux/mtd/concat.h> | |
23 | ||
674c0453 | 24 | #include <asm/hardware.h> |
1da177e4 LT |
25 | #include <asm/io.h> |
26 | #include <asm/sizes.h> | |
27 | #include <asm/mach/flash.h> | |
28 | ||
29 | #if 0 | |
30 | /* | |
31 | * This is here for documentation purposes only - until these people | |
32 | * submit their machine types. It will be gone January 2005. | |
33 | */ | |
34 | static struct mtd_partition consus_partitions[] = { | |
35 | { | |
36 | .name = "Consus boot firmware", | |
37 | .offset = 0, | |
38 | .size = 0x00040000, | |
39 | .mask_flags = MTD_WRITABLE, /* force read-only */ | |
40 | }, { | |
41 | .name = "Consus kernel", | |
42 | .offset = 0x00040000, | |
43 | .size = 0x00100000, | |
44 | .mask_flags = 0, | |
45 | }, { | |
46 | .name = "Consus disk", | |
47 | .offset = 0x00140000, | |
48 | /* The rest (up to 16M) for jffs. We could put 0 and | |
49 | make it find the size automatically, but right now | |
50 | i have 32 megs. jffs will use all 32 megs if given | |
51 | the chance, and this leads to horrible problems | |
52 | when you try to re-flash the image because blob | |
53 | won't erase the whole partition. */ | |
54 | .size = 0x01000000 - 0x00140000, | |
55 | .mask_flags = 0, | |
56 | }, { | |
57 | /* this disk is a secondary disk, which can be used as | |
58 | needed, for simplicity, make it the size of the other | |
59 | consus partition, although realistically it could be | |
60 | the remainder of the disk (depending on the file | |
61 | system used) */ | |
62 | .name = "Consus disk2", | |
63 | .offset = 0x01000000, | |
64 | .size = 0x01000000 - 0x00140000, | |
65 | .mask_flags = 0, | |
66 | } | |
67 | }; | |
68 | ||
69 | /* Frodo has 2 x 16M 28F128J3A flash chips in bank 0: */ | |
70 | static struct mtd_partition frodo_partitions[] = | |
71 | { | |
72 | { | |
73 | .name = "bootloader", | |
74 | .size = 0x00040000, | |
75 | .offset = 0x00000000, | |
76 | .mask_flags = MTD_WRITEABLE | |
77 | }, { | |
78 | .name = "bootloader params", | |
79 | .size = 0x00040000, | |
80 | .offset = MTDPART_OFS_APPEND, | |
81 | .mask_flags = MTD_WRITEABLE | |
82 | }, { | |
83 | .name = "kernel", | |
84 | .size = 0x00100000, | |
85 | .offset = MTDPART_OFS_APPEND, | |
86 | .mask_flags = MTD_WRITEABLE | |
87 | }, { | |
88 | .name = "ramdisk", | |
89 | .size = 0x00400000, | |
90 | .offset = MTDPART_OFS_APPEND, | |
91 | .mask_flags = MTD_WRITEABLE | |
92 | }, { | |
93 | .name = "file system", | |
94 | .size = MTDPART_SIZ_FULL, | |
95 | .offset = MTDPART_OFS_APPEND | |
96 | } | |
97 | }; | |
98 | ||
99 | static struct mtd_partition jornada56x_partitions[] = { | |
100 | { | |
101 | .name = "bootldr", | |
102 | .size = 0x00040000, | |
103 | .offset = 0, | |
104 | .mask_flags = MTD_WRITEABLE, | |
105 | }, { | |
106 | .name = "rootfs", | |
107 | .size = MTDPART_SIZ_FULL, | |
108 | .offset = MTDPART_OFS_APPEND, | |
109 | } | |
110 | }; | |
111 | ||
112 | static void jornada56x_set_vpp(int vpp) | |
113 | { | |
114 | if (vpp) | |
115 | GPSR = GPIO_GPIO26; | |
116 | else | |
117 | GPCR = GPIO_GPIO26; | |
118 | GPDR |= GPIO_GPIO26; | |
119 | } | |
120 | ||
121 | /* | |
122 | * Machine Phys Size set_vpp | |
123 | * Consus : SA1100_CS0_PHYS SZ_32M | |
124 | * Frodo : SA1100_CS0_PHYS SZ_32M | |
125 | * Jornada56x: SA1100_CS0_PHYS SZ_32M jornada56x_set_vpp | |
126 | */ | |
127 | #endif | |
128 | ||
129 | struct sa_subdev_info { | |
130 | char name[16]; | |
131 | struct map_info map; | |
132 | struct mtd_info *mtd; | |
133 | struct flash_platform_data *data; | |
134 | }; | |
135 | ||
136 | struct sa_info { | |
137 | struct mtd_partition *parts; | |
138 | struct mtd_info *mtd; | |
139 | int num_subdev; | |
140 | struct sa_subdev_info subdev[0]; | |
141 | }; | |
142 | ||
143 | static void sa1100_set_vpp(struct map_info *map, int on) | |
144 | { | |
145 | struct sa_subdev_info *subdev = container_of(map, struct sa_subdev_info, map); | |
146 | subdev->data->set_vpp(on); | |
147 | } | |
148 | ||
149 | static void sa1100_destroy_subdev(struct sa_subdev_info *subdev) | |
150 | { | |
151 | if (subdev->mtd) | |
152 | map_destroy(subdev->mtd); | |
153 | if (subdev->map.virt) | |
154 | iounmap(subdev->map.virt); | |
155 | release_mem_region(subdev->map.phys, subdev->map.size); | |
156 | } | |
157 | ||
158 | static int sa1100_probe_subdev(struct sa_subdev_info *subdev, struct resource *res) | |
159 | { | |
160 | unsigned long phys; | |
161 | unsigned int size; | |
162 | int ret; | |
163 | ||
164 | phys = res->start; | |
165 | size = res->end - phys + 1; | |
166 | ||
167 | /* | |
168 | * Retrieve the bankwidth from the MSC registers. | |
169 | * We currently only implement CS0 and CS1 here. | |
170 | */ | |
171 | switch (phys) { | |
172 | default: | |
173 | printk(KERN_WARNING "SA1100 flash: unknown base address " | |
174 | "0x%08lx, assuming CS0\n", phys); | |
175 | ||
176 | case SA1100_CS0_PHYS: | |
177 | subdev->map.bankwidth = (MSC0 & MSC_RBW) ? 2 : 4; | |
178 | break; | |
179 | ||
180 | case SA1100_CS1_PHYS: | |
181 | subdev->map.bankwidth = ((MSC0 >> 16) & MSC_RBW) ? 2 : 4; | |
182 | break; | |
183 | } | |
184 | ||
185 | if (!request_mem_region(phys, size, subdev->name)) { | |
186 | ret = -EBUSY; | |
187 | goto out; | |
188 | } | |
189 | ||
190 | if (subdev->data->set_vpp) | |
191 | subdev->map.set_vpp = sa1100_set_vpp; | |
192 | ||
193 | subdev->map.phys = phys; | |
194 | subdev->map.size = size; | |
195 | subdev->map.virt = ioremap(phys, size); | |
196 | if (!subdev->map.virt) { | |
197 | ret = -ENOMEM; | |
198 | goto err; | |
199 | } | |
200 | ||
201 | simple_map_init(&subdev->map); | |
202 | ||
203 | /* | |
204 | * Now let's probe for the actual flash. Do it here since | |
205 | * specific machine settings might have been set above. | |
206 | */ | |
207 | subdev->mtd = do_map_probe(subdev->data->map_name, &subdev->map); | |
208 | if (subdev->mtd == NULL) { | |
209 | ret = -ENXIO; | |
210 | goto err; | |
211 | } | |
212 | subdev->mtd->owner = THIS_MODULE; | |
213 | ||
214 | printk(KERN_INFO "SA1100 flash: CFI device at 0x%08lx, %dMiB, " | |
215 | "%d-bit\n", phys, subdev->mtd->size >> 20, | |
216 | subdev->map.bankwidth * 8); | |
217 | ||
218 | return 0; | |
219 | ||
220 | err: | |
221 | sa1100_destroy_subdev(subdev); | |
222 | out: | |
223 | return ret; | |
224 | } | |
225 | ||
226 | static void sa1100_destroy(struct sa_info *info) | |
227 | { | |
228 | int i; | |
229 | ||
230 | if (info->mtd) { | |
231 | del_mtd_partitions(info->mtd); | |
232 | ||
233 | #ifdef CONFIG_MTD_CONCAT | |
234 | if (info->mtd != info->subdev[0].mtd) | |
235 | mtd_concat_destroy(info->mtd); | |
236 | #endif | |
237 | } | |
238 | ||
239 | if (info->parts) | |
240 | kfree(info->parts); | |
241 | ||
242 | for (i = info->num_subdev - 1; i >= 0; i--) | |
243 | sa1100_destroy_subdev(&info->subdev[i]); | |
244 | kfree(info); | |
245 | } | |
246 | ||
247 | static struct sa_info *__init | |
248 | sa1100_setup_mtd(struct platform_device *pdev, struct flash_platform_data *flash) | |
249 | { | |
250 | struct sa_info *info; | |
251 | int nr, size, i, ret = 0; | |
252 | ||
253 | /* | |
254 | * Count number of devices. | |
255 | */ | |
256 | for (nr = 0; ; nr++) | |
257 | if (!platform_get_resource(pdev, IORESOURCE_MEM, nr)) | |
258 | break; | |
259 | ||
260 | if (nr == 0) { | |
261 | ret = -ENODEV; | |
262 | goto out; | |
263 | } | |
264 | ||
265 | size = sizeof(struct sa_info) + sizeof(struct sa_subdev_info) * nr; | |
266 | ||
267 | /* | |
268 | * Allocate the map_info structs in one go. | |
269 | */ | |
270 | info = kmalloc(size, GFP_KERNEL); | |
271 | if (!info) { | |
272 | ret = -ENOMEM; | |
273 | goto out; | |
274 | } | |
275 | ||
276 | memset(info, 0, size); | |
277 | ||
278 | /* | |
279 | * Claim and then map the memory regions. | |
280 | */ | |
281 | for (i = 0; i < nr; i++) { | |
282 | struct sa_subdev_info *subdev = &info->subdev[i]; | |
283 | struct resource *res; | |
284 | ||
285 | res = platform_get_resource(pdev, IORESOURCE_MEM, i); | |
286 | if (!res) | |
287 | break; | |
288 | ||
289 | subdev->map.name = subdev->name; | |
290 | sprintf(subdev->name, "sa1100-%d", i); | |
291 | subdev->data = flash; | |
292 | ||
293 | ret = sa1100_probe_subdev(subdev, res); | |
294 | if (ret) | |
295 | break; | |
296 | } | |
297 | ||
298 | info->num_subdev = i; | |
299 | ||
300 | /* | |
301 | * ENXIO is special. It means we didn't find a chip when we probed. | |
302 | */ | |
303 | if (ret != 0 && !(ret == -ENXIO && info->num_subdev > 0)) | |
304 | goto err; | |
305 | ||
306 | /* | |
307 | * If we found one device, don't bother with concat support. If | |
308 | * we found multiple devices, use concat if we have it available, | |
309 | * otherwise fail. Either way, it'll be called "sa1100". | |
310 | */ | |
311 | if (info->num_subdev == 1) { | |
312 | strcpy(info->subdev[0].name, "sa1100"); | |
313 | info->mtd = info->subdev[0].mtd; | |
314 | ret = 0; | |
315 | } else if (info->num_subdev > 1) { | |
316 | #ifdef CONFIG_MTD_CONCAT | |
317 | struct mtd_info *cdev[nr]; | |
318 | /* | |
319 | * We detected multiple devices. Concatenate them together. | |
320 | */ | |
321 | for (i = 0; i < info->num_subdev; i++) | |
322 | cdev[i] = info->subdev[i].mtd; | |
323 | ||
324 | info->mtd = mtd_concat_create(cdev, info->num_subdev, | |
325 | "sa1100"); | |
326 | if (info->mtd == NULL) | |
327 | ret = -ENXIO; | |
328 | #else | |
329 | printk(KERN_ERR "SA1100 flash: multiple devices " | |
330 | "found but MTD concat support disabled.\n"); | |
331 | ret = -ENXIO; | |
332 | #endif | |
333 | } | |
334 | ||
335 | if (ret == 0) | |
336 | return info; | |
337 | ||
338 | err: | |
339 | sa1100_destroy(info); | |
340 | out: | |
341 | return ERR_PTR(ret); | |
342 | } | |
343 | ||
344 | static const char *part_probes[] = { "cmdlinepart", "RedBoot", NULL }; | |
345 | ||
346 | static int __init sa1100_mtd_probe(struct device *dev) | |
347 | { | |
348 | struct platform_device *pdev = to_platform_device(dev); | |
349 | struct flash_platform_data *flash = pdev->dev.platform_data; | |
350 | struct mtd_partition *parts; | |
351 | const char *part_type = NULL; | |
352 | struct sa_info *info; | |
353 | int err, nr_parts = 0; | |
354 | ||
355 | if (!flash) | |
356 | return -ENODEV; | |
357 | ||
358 | info = sa1100_setup_mtd(pdev, flash); | |
359 | if (IS_ERR(info)) { | |
360 | err = PTR_ERR(info); | |
361 | goto out; | |
362 | } | |
363 | ||
364 | /* | |
365 | * Partition selection stuff. | |
366 | */ | |
367 | #ifdef CONFIG_MTD_PARTITIONS | |
368 | nr_parts = parse_mtd_partitions(info->mtd, part_probes, &parts, 0); | |
369 | if (nr_parts > 0) { | |
370 | info->parts = parts; | |
371 | part_type = "dynamic"; | |
372 | } else | |
373 | #endif | |
374 | { | |
375 | parts = flash->parts; | |
376 | nr_parts = flash->nr_parts; | |
377 | part_type = "static"; | |
378 | } | |
379 | ||
380 | if (nr_parts == 0) { | |
381 | printk(KERN_NOTICE "SA1100 flash: no partition info " | |
382 | "available, registering whole flash\n"); | |
383 | add_mtd_device(info->mtd); | |
384 | } else { | |
385 | printk(KERN_NOTICE "SA1100 flash: using %s partition " | |
386 | "definition\n", part_type); | |
387 | add_mtd_partitions(info->mtd, parts, nr_parts); | |
388 | } | |
389 | ||
390 | dev_set_drvdata(dev, info); | |
391 | err = 0; | |
392 | ||
393 | out: | |
394 | return err; | |
395 | } | |
396 | ||
397 | static int __exit sa1100_mtd_remove(struct device *dev) | |
398 | { | |
399 | struct sa_info *info = dev_get_drvdata(dev); | |
400 | dev_set_drvdata(dev, NULL); | |
401 | sa1100_destroy(info); | |
402 | return 0; | |
403 | } | |
404 | ||
405 | #ifdef CONFIG_PM | |
9480e307 | 406 | static int sa1100_mtd_suspend(struct device *dev, pm_message_t state) |
1da177e4 LT |
407 | { |
408 | struct sa_info *info = dev_get_drvdata(dev); | |
409 | int ret = 0; | |
410 | ||
9480e307 | 411 | if (info) |
1da177e4 LT |
412 | ret = info->mtd->suspend(info->mtd); |
413 | ||
414 | return ret; | |
415 | } | |
416 | ||
9480e307 | 417 | static int sa1100_mtd_resume(struct device *dev) |
1da177e4 LT |
418 | { |
419 | struct sa_info *info = dev_get_drvdata(dev); | |
9480e307 | 420 | if (info) |
1da177e4 LT |
421 | info->mtd->resume(info->mtd); |
422 | return 0; | |
423 | } | |
424 | #else | |
425 | #define sa1100_mtd_suspend NULL | |
426 | #define sa1100_mtd_resume NULL | |
427 | #endif | |
428 | ||
429 | static struct device_driver sa1100_mtd_driver = { | |
430 | .name = "flash", | |
431 | .bus = &platform_bus_type, | |
432 | .probe = sa1100_mtd_probe, | |
433 | .remove = __exit_p(sa1100_mtd_remove), | |
434 | .suspend = sa1100_mtd_suspend, | |
435 | .resume = sa1100_mtd_resume, | |
436 | }; | |
437 | ||
438 | static int __init sa1100_mtd_init(void) | |
439 | { | |
440 | return driver_register(&sa1100_mtd_driver); | |
441 | } | |
442 | ||
443 | static void __exit sa1100_mtd_exit(void) | |
444 | { | |
445 | driver_unregister(&sa1100_mtd_driver); | |
446 | } | |
447 | ||
448 | module_init(sa1100_mtd_init); | |
449 | module_exit(sa1100_mtd_exit); | |
450 | ||
451 | MODULE_AUTHOR("Nicolas Pitre"); | |
452 | MODULE_DESCRIPTION("SA1100 CFI map driver"); | |
453 | MODULE_LICENSE("GPL"); |