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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/mtd/maps/sa1100-flash.c | |
download | kernel_samsung_aries-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip kernel_samsung_aries-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz kernel_samsung_aries-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/mtd/maps/sa1100-flash.c')
-rw-r--r-- | drivers/mtd/maps/sa1100-flash.c | 453 |
1 files changed, 453 insertions, 0 deletions
diff --git a/drivers/mtd/maps/sa1100-flash.c b/drivers/mtd/maps/sa1100-flash.c new file mode 100644 index 0000000..0a6f861 --- /dev/null +++ b/drivers/mtd/maps/sa1100-flash.c @@ -0,0 +1,453 @@ +/* + * Flash memory access on SA11x0 based devices + * + * (C) 2000 Nicolas Pitre <nico@cam.org> + * + * $Id: sa1100-flash.c,v 1.47 2004/11/01 13:44:36 rmk Exp $ + */ +#include <linux/config.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/ioport.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/errno.h> +#include <linux/slab.h> +#include <linux/device.h> +#include <linux/err.h> + +#include <linux/mtd/mtd.h> +#include <linux/mtd/map.h> +#include <linux/mtd/partitions.h> +#include <linux/mtd/concat.h> + +#include <asm/mach-types.h> +#include <asm/io.h> +#include <asm/sizes.h> +#include <asm/mach/flash.h> + +#if 0 +/* + * This is here for documentation purposes only - until these people + * submit their machine types. It will be gone January 2005. + */ +static struct mtd_partition consus_partitions[] = { + { + .name = "Consus boot firmware", + .offset = 0, + .size = 0x00040000, + .mask_flags = MTD_WRITABLE, /* force read-only */ + }, { + .name = "Consus kernel", + .offset = 0x00040000, + .size = 0x00100000, + .mask_flags = 0, + }, { + .name = "Consus disk", + .offset = 0x00140000, + /* The rest (up to 16M) for jffs. We could put 0 and + make it find the size automatically, but right now + i have 32 megs. jffs will use all 32 megs if given + the chance, and this leads to horrible problems + when you try to re-flash the image because blob + won't erase the whole partition. */ + .size = 0x01000000 - 0x00140000, + .mask_flags = 0, + }, { + /* this disk is a secondary disk, which can be used as + needed, for simplicity, make it the size of the other + consus partition, although realistically it could be + the remainder of the disk (depending on the file + system used) */ + .name = "Consus disk2", + .offset = 0x01000000, + .size = 0x01000000 - 0x00140000, + .mask_flags = 0, + } +}; + +/* Frodo has 2 x 16M 28F128J3A flash chips in bank 0: */ +static struct mtd_partition frodo_partitions[] = +{ + { + .name = "bootloader", + .size = 0x00040000, + .offset = 0x00000000, + .mask_flags = MTD_WRITEABLE + }, { + .name = "bootloader params", + .size = 0x00040000, + .offset = MTDPART_OFS_APPEND, + .mask_flags = MTD_WRITEABLE + }, { + .name = "kernel", + .size = 0x00100000, + .offset = MTDPART_OFS_APPEND, + .mask_flags = MTD_WRITEABLE + }, { + .name = "ramdisk", + .size = 0x00400000, + .offset = MTDPART_OFS_APPEND, + .mask_flags = MTD_WRITEABLE + }, { + .name = "file system", + .size = MTDPART_SIZ_FULL, + .offset = MTDPART_OFS_APPEND + } +}; + +static struct mtd_partition jornada56x_partitions[] = { + { + .name = "bootldr", + .size = 0x00040000, + .offset = 0, + .mask_flags = MTD_WRITEABLE, + }, { + .name = "rootfs", + .size = MTDPART_SIZ_FULL, + .offset = MTDPART_OFS_APPEND, + } +}; + +static void jornada56x_set_vpp(int vpp) +{ + if (vpp) + GPSR = GPIO_GPIO26; + else + GPCR = GPIO_GPIO26; + GPDR |= GPIO_GPIO26; +} + +/* + * Machine Phys Size set_vpp + * Consus : SA1100_CS0_PHYS SZ_32M + * Frodo : SA1100_CS0_PHYS SZ_32M + * Jornada56x: SA1100_CS0_PHYS SZ_32M jornada56x_set_vpp + */ +#endif + +struct sa_subdev_info { + char name[16]; + struct map_info map; + struct mtd_info *mtd; + struct flash_platform_data *data; +}; + +struct sa_info { + struct mtd_partition *parts; + struct mtd_info *mtd; + int num_subdev; + struct sa_subdev_info subdev[0]; +}; + +static void sa1100_set_vpp(struct map_info *map, int on) +{ + struct sa_subdev_info *subdev = container_of(map, struct sa_subdev_info, map); + subdev->data->set_vpp(on); +} + +static void sa1100_destroy_subdev(struct sa_subdev_info *subdev) +{ + if (subdev->mtd) + map_destroy(subdev->mtd); + if (subdev->map.virt) + iounmap(subdev->map.virt); + release_mem_region(subdev->map.phys, subdev->map.size); +} + +static int sa1100_probe_subdev(struct sa_subdev_info *subdev, struct resource *res) +{ + unsigned long phys; + unsigned int size; + int ret; + + phys = res->start; + size = res->end - phys + 1; + + /* + * Retrieve the bankwidth from the MSC registers. + * We currently only implement CS0 and CS1 here. + */ + switch (phys) { + default: + printk(KERN_WARNING "SA1100 flash: unknown base address " + "0x%08lx, assuming CS0\n", phys); + + case SA1100_CS0_PHYS: + subdev->map.bankwidth = (MSC0 & MSC_RBW) ? 2 : 4; + break; + + case SA1100_CS1_PHYS: + subdev->map.bankwidth = ((MSC0 >> 16) & MSC_RBW) ? 2 : 4; + break; + } + + if (!request_mem_region(phys, size, subdev->name)) { + ret = -EBUSY; + goto out; + } + + if (subdev->data->set_vpp) + subdev->map.set_vpp = sa1100_set_vpp; + + subdev->map.phys = phys; + subdev->map.size = size; + subdev->map.virt = ioremap(phys, size); + if (!subdev->map.virt) { + ret = -ENOMEM; + goto err; + } + + simple_map_init(&subdev->map); + + /* + * Now let's probe for the actual flash. Do it here since + * specific machine settings might have been set above. + */ + subdev->mtd = do_map_probe(subdev->data->map_name, &subdev->map); + if (subdev->mtd == NULL) { + ret = -ENXIO; + goto err; + } + subdev->mtd->owner = THIS_MODULE; + + printk(KERN_INFO "SA1100 flash: CFI device at 0x%08lx, %dMiB, " + "%d-bit\n", phys, subdev->mtd->size >> 20, + subdev->map.bankwidth * 8); + + return 0; + + err: + sa1100_destroy_subdev(subdev); + out: + return ret; +} + +static void sa1100_destroy(struct sa_info *info) +{ + int i; + + if (info->mtd) { + del_mtd_partitions(info->mtd); + +#ifdef CONFIG_MTD_CONCAT + if (info->mtd != info->subdev[0].mtd) + mtd_concat_destroy(info->mtd); +#endif + } + + if (info->parts) + kfree(info->parts); + + for (i = info->num_subdev - 1; i >= 0; i--) + sa1100_destroy_subdev(&info->subdev[i]); + kfree(info); +} + +static struct sa_info *__init +sa1100_setup_mtd(struct platform_device *pdev, struct flash_platform_data *flash) +{ + struct sa_info *info; + int nr, size, i, ret = 0; + + /* + * Count number of devices. + */ + for (nr = 0; ; nr++) + if (!platform_get_resource(pdev, IORESOURCE_MEM, nr)) + break; + + if (nr == 0) { + ret = -ENODEV; + goto out; + } + + size = sizeof(struct sa_info) + sizeof(struct sa_subdev_info) * nr; + + /* + * Allocate the map_info structs in one go. + */ + info = kmalloc(size, GFP_KERNEL); + if (!info) { + ret = -ENOMEM; + goto out; + } + + memset(info, 0, size); + + /* + * Claim and then map the memory regions. + */ + for (i = 0; i < nr; i++) { + struct sa_subdev_info *subdev = &info->subdev[i]; + struct resource *res; + + res = platform_get_resource(pdev, IORESOURCE_MEM, i); + if (!res) + break; + + subdev->map.name = subdev->name; + sprintf(subdev->name, "sa1100-%d", i); + subdev->data = flash; + + ret = sa1100_probe_subdev(subdev, res); + if (ret) + break; + } + + info->num_subdev = i; + + /* + * ENXIO is special. It means we didn't find a chip when we probed. + */ + if (ret != 0 && !(ret == -ENXIO && info->num_subdev > 0)) + goto err; + + /* + * If we found one device, don't bother with concat support. If + * we found multiple devices, use concat if we have it available, + * otherwise fail. Either way, it'll be called "sa1100". + */ + if (info->num_subdev == 1) { + strcpy(info->subdev[0].name, "sa1100"); + info->mtd = info->subdev[0].mtd; + ret = 0; + } else if (info->num_subdev > 1) { +#ifdef CONFIG_MTD_CONCAT + struct mtd_info *cdev[nr]; + /* + * We detected multiple devices. Concatenate them together. + */ + for (i = 0; i < info->num_subdev; i++) + cdev[i] = info->subdev[i].mtd; + + info->mtd = mtd_concat_create(cdev, info->num_subdev, + "sa1100"); + if (info->mtd == NULL) + ret = -ENXIO; +#else + printk(KERN_ERR "SA1100 flash: multiple devices " + "found but MTD concat support disabled.\n"); + ret = -ENXIO; +#endif + } + + if (ret == 0) + return info; + + err: + sa1100_destroy(info); + out: + return ERR_PTR(ret); +} + +static const char *part_probes[] = { "cmdlinepart", "RedBoot", NULL }; + +static int __init sa1100_mtd_probe(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct flash_platform_data *flash = pdev->dev.platform_data; + struct mtd_partition *parts; + const char *part_type = NULL; + struct sa_info *info; + int err, nr_parts = 0; + + if (!flash) + return -ENODEV; + + info = sa1100_setup_mtd(pdev, flash); + if (IS_ERR(info)) { + err = PTR_ERR(info); + goto out; + } + + /* + * Partition selection stuff. + */ +#ifdef CONFIG_MTD_PARTITIONS + nr_parts = parse_mtd_partitions(info->mtd, part_probes, &parts, 0); + if (nr_parts > 0) { + info->parts = parts; + part_type = "dynamic"; + } else +#endif + { + parts = flash->parts; + nr_parts = flash->nr_parts; + part_type = "static"; + } + + if (nr_parts == 0) { + printk(KERN_NOTICE "SA1100 flash: no partition info " + "available, registering whole flash\n"); + add_mtd_device(info->mtd); + } else { + printk(KERN_NOTICE "SA1100 flash: using %s partition " + "definition\n", part_type); + add_mtd_partitions(info->mtd, parts, nr_parts); + } + + dev_set_drvdata(dev, info); + err = 0; + + out: + return err; +} + +static int __exit sa1100_mtd_remove(struct device *dev) +{ + struct sa_info *info = dev_get_drvdata(dev); + dev_set_drvdata(dev, NULL); + sa1100_destroy(info); + return 0; +} + +#ifdef CONFIG_PM +static int sa1100_mtd_suspend(struct device *dev, u32 state, u32 level) +{ + struct sa_info *info = dev_get_drvdata(dev); + int ret = 0; + + if (info && level == SUSPEND_SAVE_STATE) + ret = info->mtd->suspend(info->mtd); + + return ret; +} + +static int sa1100_mtd_resume(struct device *dev, u32 level) +{ + struct sa_info *info = dev_get_drvdata(dev); + if (info && level == RESUME_RESTORE_STATE) + info->mtd->resume(info->mtd); + return 0; +} +#else +#define sa1100_mtd_suspend NULL +#define sa1100_mtd_resume NULL +#endif + +static struct device_driver sa1100_mtd_driver = { + .name = "flash", + .bus = &platform_bus_type, + .probe = sa1100_mtd_probe, + .remove = __exit_p(sa1100_mtd_remove), + .suspend = sa1100_mtd_suspend, + .resume = sa1100_mtd_resume, +}; + +static int __init sa1100_mtd_init(void) +{ + return driver_register(&sa1100_mtd_driver); +} + +static void __exit sa1100_mtd_exit(void) +{ + driver_unregister(&sa1100_mtd_driver); +} + +module_init(sa1100_mtd_init); +module_exit(sa1100_mtd_exit); + +MODULE_AUTHOR("Nicolas Pitre"); +MODULE_DESCRIPTION("SA1100 CFI map driver"); +MODULE_LICENSE("GPL"); |