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path: root/drivers/mtd/maps/sa1100-flash.c
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Diffstat (limited to 'drivers/mtd/maps/sa1100-flash.c')
-rw-r--r--drivers/mtd/maps/sa1100-flash.c453
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 00000000000..0a6f861c4cd
--- /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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-20 07:09:58 +0000