2 * Flash memory access on SA11x0 based devices
4 * (C) 2000 Nicolas Pitre <nico@cam.org>
6 * $Id: sa1100-flash.c,v 1.47 2004/11/01 13:44:36 rmk Exp $
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>
16 #include <linux/device.h>
17 #include <linux/err.h>
19 #include <linux/mtd/mtd.h>
20 #include <linux/mtd/map.h>
21 #include <linux/mtd/partitions.h>
22 #include <linux/mtd/concat.h>
24 #include <asm/hardware.h>
26 #include <asm/sizes.h>
27 #include <asm/mach/flash.h>
31 * This is here for documentation purposes only - until these people
32 * submit their machine types. It will be gone January 2005.
34 static struct mtd_partition consus_partitions[] = {
36 .name = "Consus boot firmware",
39 .mask_flags = MTD_WRITABLE, /* force read-only */
41 .name = "Consus kernel",
46 .name = "Consus disk",
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,
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
62 .name = "Consus disk2",
64 .size = 0x01000000 - 0x00140000,
69 /* Frodo has 2 x 16M 28F128J3A flash chips in bank 0: */
70 static struct mtd_partition frodo_partitions[] =
76 .mask_flags = MTD_WRITEABLE
78 .name = "bootloader params",
80 .offset = MTDPART_OFS_APPEND,
81 .mask_flags = MTD_WRITEABLE
85 .offset = MTDPART_OFS_APPEND,
86 .mask_flags = MTD_WRITEABLE
90 .offset = MTDPART_OFS_APPEND,
91 .mask_flags = MTD_WRITEABLE
93 .name = "file system",
94 .size = MTDPART_SIZ_FULL,
95 .offset = MTDPART_OFS_APPEND
99 static struct mtd_partition jornada56x_partitions[] = {
104 .mask_flags = MTD_WRITEABLE,
107 .size = MTDPART_SIZ_FULL,
108 .offset = MTDPART_OFS_APPEND,
112 static void jornada56x_set_vpp(int vpp)
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
129 struct sa_subdev_info {
132 struct mtd_info *mtd;
133 struct flash_platform_data *plat;
137 struct mtd_partition *parts;
138 struct mtd_info *mtd;
140 unsigned int nr_parts;
141 struct sa_subdev_info subdev[0];
144 static void sa1100_set_vpp(struct map_info *map, int on)
146 struct sa_subdev_info *subdev = container_of(map, struct sa_subdev_info, map);
147 subdev->plat->set_vpp(on);
150 static void sa1100_destroy_subdev(struct sa_subdev_info *subdev)
153 map_destroy(subdev->mtd);
154 if (subdev->map.virt)
155 iounmap(subdev->map.virt);
156 release_mem_region(subdev->map.phys, subdev->map.size);
159 static int sa1100_probe_subdev(struct sa_subdev_info *subdev, struct resource *res)
166 size = res->end - phys + 1;
169 * Retrieve the bankwidth from the MSC registers.
170 * We currently only implement CS0 and CS1 here.
174 printk(KERN_WARNING "SA1100 flash: unknown base address "
175 "0x%08lx, assuming CS0\n", phys);
177 case SA1100_CS0_PHYS:
178 subdev->map.bankwidth = (MSC0 & MSC_RBW) ? 2 : 4;
181 case SA1100_CS1_PHYS:
182 subdev->map.bankwidth = ((MSC0 >> 16) & MSC_RBW) ? 2 : 4;
186 if (!request_mem_region(phys, size, subdev->name)) {
191 if (subdev->plat->set_vpp)
192 subdev->map.set_vpp = sa1100_set_vpp;
194 subdev->map.phys = phys;
195 subdev->map.size = size;
196 subdev->map.virt = ioremap(phys, size);
197 if (!subdev->map.virt) {
202 simple_map_init(&subdev->map);
205 * Now let's probe for the actual flash. Do it here since
206 * specific machine settings might have been set above.
208 subdev->mtd = do_map_probe(subdev->plat->map_name, &subdev->map);
209 if (subdev->mtd == NULL) {
213 subdev->mtd->owner = THIS_MODULE;
215 printk(KERN_INFO "SA1100 flash: CFI device at 0x%08lx, %dMiB, "
216 "%d-bit\n", phys, subdev->mtd->size >> 20,
217 subdev->map.bankwidth * 8);
222 sa1100_destroy_subdev(subdev);
227 static void sa1100_destroy(struct sa_info *info, struct flash_platform_data *plat)
232 if (info->nr_parts == 0)
233 del_mtd_device(info->mtd);
234 #ifdef CONFIG_MTD_PARTITIONS
236 del_mtd_partitions(info->mtd);
238 #ifdef CONFIG_MTD_CONCAT
239 if (info->mtd != info->subdev[0].mtd)
240 mtd_concat_destroy(info->mtd);
247 for (i = info->num_subdev - 1; i >= 0; i--)
248 sa1100_destroy_subdev(&info->subdev[i]);
255 static struct sa_info *__init
256 sa1100_setup_mtd(struct platform_device *pdev, struct flash_platform_data *plat)
258 struct sa_info *info;
259 int nr, size, i, ret = 0;
262 * Count number of devices.
265 if (!platform_get_resource(pdev, IORESOURCE_MEM, nr))
273 size = sizeof(struct sa_info) + sizeof(struct sa_subdev_info) * nr;
276 * Allocate the map_info structs in one go.
278 info = kmalloc(size, GFP_KERNEL);
284 memset(info, 0, size);
293 * Claim and then map the memory regions.
295 for (i = 0; i < nr; i++) {
296 struct sa_subdev_info *subdev = &info->subdev[i];
297 struct resource *res;
299 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
303 subdev->map.name = subdev->name;
304 sprintf(subdev->name, "%s-%d", plat->name, i);
307 ret = sa1100_probe_subdev(subdev, res);
312 info->num_subdev = i;
315 * ENXIO is special. It means we didn't find a chip when we probed.
317 if (ret != 0 && !(ret == -ENXIO && info->num_subdev > 0))
321 * If we found one device, don't bother with concat support. If
322 * we found multiple devices, use concat if we have it available,
323 * otherwise fail. Either way, it'll be called "sa1100".
325 if (info->num_subdev == 1) {
326 strcpy(info->subdev[0].name, plat->name);
327 info->mtd = info->subdev[0].mtd;
329 } else if (info->num_subdev > 1) {
330 #ifdef CONFIG_MTD_CONCAT
331 struct mtd_info *cdev[nr];
333 * We detected multiple devices. Concatenate them together.
335 for (i = 0; i < info->num_subdev; i++)
336 cdev[i] = info->subdev[i].mtd;
338 info->mtd = mtd_concat_create(cdev, info->num_subdev,
340 if (info->mtd == NULL)
343 printk(KERN_ERR "SA1100 flash: multiple devices "
344 "found but MTD concat support disabled.\n");
353 sa1100_destroy(info, plat);
358 static const char *part_probes[] = { "cmdlinepart", "RedBoot", NULL };
360 static int __init sa1100_mtd_probe(struct device *dev)
362 struct platform_device *pdev = to_platform_device(dev);
363 struct flash_platform_data *plat = pdev->dev.platform_data;
364 struct mtd_partition *parts;
365 const char *part_type = NULL;
366 struct sa_info *info;
367 int err, nr_parts = 0;
372 info = sa1100_setup_mtd(pdev, plat);
379 * Partition selection stuff.
381 #ifdef CONFIG_MTD_PARTITIONS
382 nr_parts = parse_mtd_partitions(info->mtd, part_probes, &parts, 0);
385 part_type = "dynamic";
390 nr_parts = plat->nr_parts;
391 part_type = "static";
395 printk(KERN_NOTICE "SA1100 flash: no partition info "
396 "available, registering whole flash\n");
397 add_mtd_device(info->mtd);
399 printk(KERN_NOTICE "SA1100 flash: using %s partition "
400 "definition\n", part_type);
401 add_mtd_partitions(info->mtd, parts, nr_parts);
404 info->nr_parts = nr_parts;
406 dev_set_drvdata(dev, info);
413 static int __exit sa1100_mtd_remove(struct device *dev)
415 struct sa_info *info = dev_get_drvdata(dev);
416 struct flash_platform_data *plat = dev->platform_data;
418 dev_set_drvdata(dev, NULL);
419 sa1100_destroy(info, plat);
425 static int sa1100_mtd_suspend(struct device *dev, pm_message_t state)
427 struct sa_info *info = dev_get_drvdata(dev);
431 ret = info->mtd->suspend(info->mtd);
436 static int sa1100_mtd_resume(struct device *dev)
438 struct sa_info *info = dev_get_drvdata(dev);
440 info->mtd->resume(info->mtd);
444 static void sa1100_mtd_shutdown(struct device *dev)
446 struct sa_info *info = dev_get_drvdata(dev);
447 if (info && info->mtd->suspend(info->mtd) == 0)
448 info->mtd->resume(info->mtd);
451 #define sa1100_mtd_suspend NULL
452 #define sa1100_mtd_resume NULL
453 #define sa1100_mtd_shutdown NULL
456 static struct device_driver sa1100_mtd_driver = {
458 .bus = &platform_bus_type,
459 .probe = sa1100_mtd_probe,
460 .remove = __exit_p(sa1100_mtd_remove),
461 .suspend = sa1100_mtd_suspend,
462 .resume = sa1100_mtd_resume,
463 .shutdown = sa1100_mtd_shutdown,
466 static int __init sa1100_mtd_init(void)
468 return driver_register(&sa1100_mtd_driver);
471 static void __exit sa1100_mtd_exit(void)
473 driver_unregister(&sa1100_mtd_driver);
476 module_init(sa1100_mtd_init);
477 module_exit(sa1100_mtd_exit);
479 MODULE_AUTHOR("Nicolas Pitre");
480 MODULE_DESCRIPTION("SA1100 CFI map driver");
481 MODULE_LICENSE("GPL");