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path: root/drivers/mtd/maps/physmap.c
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Diffstat (limited to 'drivers/mtd/maps/physmap.c')
-rw-r--r--drivers/mtd/maps/physmap.c281
1 files changed, 281 insertions, 0 deletions
diff --git a/drivers/mtd/maps/physmap.c b/drivers/mtd/maps/physmap.c
new file mode 100644
index 000000000..4305fd607
--- /dev/null
+++ b/drivers/mtd/maps/physmap.c
@@ -0,0 +1,281 @@
+/*
+ * Normal mappings of chips in physical memory
+ *
+ * Copyright (C) 2003 MontaVista Software Inc.
+ * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
+ *
+ * 031022 - [jsun] add run-time configure and partition setup
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/physmap.h>
+#include <linux/mtd/concat.h>
+#include <linux/io.h>
+
+#define MAX_RESOURCES 4
+
+struct physmap_flash_info {
+ struct mtd_info *mtd[MAX_RESOURCES];
+ struct mtd_info *cmtd;
+ struct map_info map[MAX_RESOURCES];
+ spinlock_t vpp_lock;
+ int vpp_refcnt;
+};
+
+static int physmap_flash_remove(struct platform_device *dev)
+{
+ struct physmap_flash_info *info;
+ struct physmap_flash_data *physmap_data;
+ int i;
+
+ info = platform_get_drvdata(dev);
+ if (info == NULL)
+ return 0;
+
+ physmap_data = dev_get_platdata(&dev->dev);
+
+ if (info->cmtd) {
+ mtd_device_unregister(info->cmtd);
+ if (info->cmtd != info->mtd[0])
+ mtd_concat_destroy(info->cmtd);
+ }
+
+ for (i = 0; i < MAX_RESOURCES; i++) {
+ if (info->mtd[i] != NULL)
+ map_destroy(info->mtd[i]);
+ }
+
+ if (physmap_data->exit)
+ physmap_data->exit(dev);
+
+ return 0;
+}
+
+static void physmap_set_vpp(struct map_info *map, int state)
+{
+ struct platform_device *pdev;
+ struct physmap_flash_data *physmap_data;
+ struct physmap_flash_info *info;
+ unsigned long flags;
+
+ pdev = (struct platform_device *)map->map_priv_1;
+ physmap_data = dev_get_platdata(&pdev->dev);
+
+ if (!physmap_data->set_vpp)
+ return;
+
+ info = platform_get_drvdata(pdev);
+
+ spin_lock_irqsave(&info->vpp_lock, flags);
+ if (state) {
+ if (++info->vpp_refcnt == 1) /* first nested 'on' */
+ physmap_data->set_vpp(pdev, 1);
+ } else {
+ if (--info->vpp_refcnt == 0) /* last nested 'off' */
+ physmap_data->set_vpp(pdev, 0);
+ }
+ spin_unlock_irqrestore(&info->vpp_lock, flags);
+}
+
+static const char * const rom_probe_types[] = {
+ "cfi_probe", "jedec_probe", "qinfo_probe", "map_rom", NULL };
+
+static const char * const part_probe_types[] = {
+ "cmdlinepart", "RedBoot", "afs", NULL };
+
+static int physmap_flash_probe(struct platform_device *dev)
+{
+ struct physmap_flash_data *physmap_data;
+ struct physmap_flash_info *info;
+ const char * const *probe_type;
+ const char * const *part_types;
+ int err = 0;
+ int i;
+ int devices_found = 0;
+
+ physmap_data = dev_get_platdata(&dev->dev);
+ if (physmap_data == NULL)
+ return -ENODEV;
+
+ info = devm_kzalloc(&dev->dev, sizeof(struct physmap_flash_info),
+ GFP_KERNEL);
+ if (info == NULL) {
+ err = -ENOMEM;
+ goto err_out;
+ }
+
+ if (physmap_data->init) {
+ err = physmap_data->init(dev);
+ if (err)
+ goto err_out;
+ }
+
+ platform_set_drvdata(dev, info);
+
+ for (i = 0; i < dev->num_resources; i++) {
+ printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
+ (unsigned long long)resource_size(&dev->resource[i]),
+ (unsigned long long)dev->resource[i].start);
+
+ if (!devm_request_mem_region(&dev->dev,
+ dev->resource[i].start,
+ resource_size(&dev->resource[i]),
+ dev_name(&dev->dev))) {
+ dev_err(&dev->dev, "Could not reserve memory region\n");
+ err = -ENOMEM;
+ goto err_out;
+ }
+
+ info->map[i].name = dev_name(&dev->dev);
+ info->map[i].phys = dev->resource[i].start;
+ info->map[i].size = resource_size(&dev->resource[i]);
+ info->map[i].bankwidth = physmap_data->width;
+ info->map[i].set_vpp = physmap_set_vpp;
+ info->map[i].pfow_base = physmap_data->pfow_base;
+ info->map[i].map_priv_1 = (unsigned long)dev;
+
+ info->map[i].virt = devm_ioremap(&dev->dev, info->map[i].phys,
+ info->map[i].size);
+ if (info->map[i].virt == NULL) {
+ dev_err(&dev->dev, "Failed to ioremap flash region\n");
+ err = -EIO;
+ goto err_out;
+ }
+
+ simple_map_init(&info->map[i]);
+
+ probe_type = rom_probe_types;
+ if (physmap_data->probe_type == NULL) {
+ for (; info->mtd[i] == NULL && *probe_type != NULL; probe_type++)
+ info->mtd[i] = do_map_probe(*probe_type, &info->map[i]);
+ } else
+ info->mtd[i] = do_map_probe(physmap_data->probe_type, &info->map[i]);
+
+ if (info->mtd[i] == NULL) {
+ dev_err(&dev->dev, "map_probe failed\n");
+ err = -ENXIO;
+ goto err_out;
+ } else {
+ devices_found++;
+ }
+ info->mtd[i]->owner = THIS_MODULE;
+ info->mtd[i]->dev.parent = &dev->dev;
+ }
+
+ if (devices_found == 1) {
+ info->cmtd = info->mtd[0];
+ } else if (devices_found > 1) {
+ /*
+ * We detected multiple devices. Concatenate them together.
+ */
+ info->cmtd = mtd_concat_create(info->mtd, devices_found, dev_name(&dev->dev));
+ if (info->cmtd == NULL)
+ err = -ENXIO;
+ }
+ if (err)
+ goto err_out;
+
+ spin_lock_init(&info->vpp_lock);
+
+ part_types = physmap_data->part_probe_types ? : part_probe_types;
+
+ mtd_device_parse_register(info->cmtd, part_types, NULL,
+ physmap_data->parts, physmap_data->nr_parts);
+ return 0;
+
+err_out:
+ physmap_flash_remove(dev);
+ return err;
+}
+
+#ifdef CONFIG_PM
+static void physmap_flash_shutdown(struct platform_device *dev)
+{
+ struct physmap_flash_info *info = platform_get_drvdata(dev);
+ int i;
+
+ for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
+ if (mtd_suspend(info->mtd[i]) == 0)
+ mtd_resume(info->mtd[i]);
+}
+#else
+#define physmap_flash_shutdown NULL
+#endif
+
+static struct platform_driver physmap_flash_driver = {
+ .probe = physmap_flash_probe,
+ .remove = physmap_flash_remove,
+ .shutdown = physmap_flash_shutdown,
+ .driver = {
+ .name = "physmap-flash",
+ },
+};
+
+
+#ifdef CONFIG_MTD_PHYSMAP_COMPAT
+static struct physmap_flash_data physmap_flash_data = {
+ .width = CONFIG_MTD_PHYSMAP_BANKWIDTH,
+};
+
+static struct resource physmap_flash_resource = {
+ .start = CONFIG_MTD_PHYSMAP_START,
+ .end = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
+ .flags = IORESOURCE_MEM,
+};
+
+static struct platform_device physmap_flash = {
+ .name = "physmap-flash",
+ .id = 0,
+ .dev = {
+ .platform_data = &physmap_flash_data,
+ },
+ .num_resources = 1,
+ .resource = &physmap_flash_resource,
+};
+#endif
+
+static int __init physmap_init(void)
+{
+ int err;
+
+ err = platform_driver_register(&physmap_flash_driver);
+#ifdef CONFIG_MTD_PHYSMAP_COMPAT
+ if (err == 0) {
+ err = platform_device_register(&physmap_flash);
+ if (err)
+ platform_driver_unregister(&physmap_flash_driver);
+ }
+#endif
+
+ return err;
+}
+
+static void __exit physmap_exit(void)
+{
+#ifdef CONFIG_MTD_PHYSMAP_COMPAT
+ platform_device_unregister(&physmap_flash);
+#endif
+ platform_driver_unregister(&physmap_flash_driver);
+}
+
+module_init(physmap_init);
+module_exit(physmap_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
+MODULE_DESCRIPTION("Generic configurable MTD map driver");
+
+/* legacy platform drivers can't hotplug or coldplg */
+#ifndef CONFIG_MTD_PHYSMAP_COMPAT
+/* work with hotplug and coldplug */
+MODULE_ALIAS("platform:physmap-flash");
+#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-01 08:58:08 +0000