/*
- * Normal mappings of chips in physical memory for OF devices
+ * Flash mappings described by the OF (or flattened) device tree
*
* Copyright (C) 2006 MontaVista Software Inc.
* Author: Vitaly Wool <vwool@ru.mvista.com>
#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/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
-#include <linux/mtd/physmap.h>
-#include <asm/io.h>
-#include <asm/prom.h>
-#include <asm/of_device.h>
-#include <asm/of_platform.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
-struct physmap_flash_info {
+struct of_flash {
struct mtd_info *mtd;
struct map_info map;
struct resource *res;
};
#ifdef CONFIG_MTD_PARTITIONS
+#define OF_FLASH_PARTS(info) ((info)->parts)
+
static int parse_obsolete_partitions(struct of_device *dev,
- struct physmap_flash_info *info,
+ struct of_flash *info,
struct device_node *dp)
{
int i, plen, nr_parts;
part = of_get_property(dp, "partitions", &plen);
if (!part)
- return -ENOENT;
+ return 0; /* No partitions found */
dev_warn(&dev->dev, "Device tree uses obsolete partition map binding\n");
nr_parts = plen / sizeof(part[0]);
- info->parts = kzalloc(nr_parts * sizeof(struct mtd_partition), GFP_KERNEL);
- if (!info->parts) {
- printk(KERN_ERR "Can't allocate the flash partition data!\n");
+ info->parts = kzalloc(nr_parts * sizeof(*info->parts), GFP_KERNEL);
+ if (!info->parts)
return -ENOMEM;
- }
names = of_get_property(dp, "partition-names", &plen);
return nr_parts;
}
-static int __devinit process_partitions(struct physmap_flash_info *info,
- struct of_device *dev)
+static int __devinit parse_partitions(struct of_flash *info,
+ struct of_device *dev)
{
const char *partname;
static const char *part_probe_types[]
for (pp = dp->child; pp; pp = pp->sibling)
nr_parts++;
- if (nr_parts) {
- info->parts = kzalloc(nr_parts * sizeof(struct mtd_partition),
- GFP_KERNEL);
- if (!info->parts) {
- printk(KERN_ERR "Can't allocate the flash partition data!\n");
- return -ENOMEM;
- }
+ if (nr_parts == 0)
+ return parse_obsolete_partitions(dev, info, dp);
+
+ info->parts = kzalloc(nr_parts * sizeof(*info->parts),
+ GFP_KERNEL);
+ if (!info->parts)
+ return -ENOMEM;
- for (pp = dp->child, i = 0 ; pp; pp = pp->sibling, i++) {
- const u32 *reg;
- int len;
-
- reg = of_get_property(pp, "reg", &len);
- if (!reg || (len != 2*sizeof(u32))) {
- dev_err(&dev->dev, "Invalid 'reg' on %s\n",
- dp->full_name);
- kfree(info->parts);
- info->parts = NULL;
- return -EINVAL;
- }
- info->parts[i].offset = reg[0];
- info->parts[i].size = reg[1];
-
- partname = of_get_property(pp, "label", &len);
- if (!partname)
- partname = of_get_property(pp, "name", &len);
- info->parts[i].name = (char *)partname;
-
- if (of_get_property(pp, "read-only", &len))
- info->parts[i].mask_flags = MTD_WRITEABLE;
+ for (pp = dp->child, i = 0; pp; pp = pp->sibling, i++) {
+ const u32 *reg;
+ int len;
+
+ reg = of_get_property(pp, "reg", &len);
+ if (!reg || (len != 2*sizeof(u32))) {
+ dev_err(&dev->dev, "Invalid 'reg' on %s\n",
+ dp->full_name);
+ kfree(info->parts);
+ info->parts = NULL;
+ return -EINVAL;
}
- } else {
- nr_parts = parse_obsolete_partitions(dev, info, dp);
- if (nr_parts == -ENOENT)
- nr_parts = 0;
- }
+ info->parts[i].offset = reg[0];
+ info->parts[i].size = reg[1];
- if (nr_parts < 0)
- return nr_parts;
+ partname = of_get_property(pp, "label", &len);
+ if (!partname)
+ partname = of_get_property(pp, "name", &len);
+ info->parts[i].name = (char *)partname;
- if (nr_parts > 0)
- add_mtd_partitions(info->mtd, info->parts, nr_parts);
- else
- add_mtd_device(info->mtd);
+ if (of_get_property(pp, "read-only", &len))
+ info->parts[i].mask_flags = MTD_WRITEABLE;
+ }
- return 0;
+ return nr_parts;
}
#else /* MTD_PARTITIONS */
-static int __devinit process_partitions(struct physmap_flash_info *info,
- struct device_node *dev)
-{
- add_mtd_device(info->mtd);
- return 0;
-}
+#define OF_FLASH_PARTS(info) (0)
+#define parse_partitions(info, dev) (0)
#endif /* MTD_PARTITIONS */
-static int of_physmap_remove(struct of_device *dev)
+static int of_flash_remove(struct of_device *dev)
{
- struct physmap_flash_info *info;
+ struct of_flash *info;
info = dev_get_drvdata(&dev->dev);
- if (info == NULL)
+ if (!info)
return 0;
dev_set_drvdata(&dev->dev, NULL);
- if (info->mtd != NULL) {
-#ifdef CONFIG_MTD_PARTITIONS
- if (info->parts) {
+ if (info->mtd) {
+ if (OF_FLASH_PARTS(info)) {
del_mtd_partitions(info->mtd);
- kfree(info->parts);
+ kfree(OF_FLASH_PARTS(info));
} else {
del_mtd_device(info->mtd);
}
-#else
- del_mtd_device(info->mtd);
-#endif
map_destroy(info->mtd);
}
- if (info->map.virt != NULL)
+ if (info->map.virt)
iounmap(info->map.virt);
- if (info->res != NULL) {
+ if (info->res) {
release_resource(info->res);
kfree(info->res);
}
return do_map_probe("jedec_probe", map);
} else {
if (strcmp(of_probe, "ROM") != 0)
- dev_dbg(&dev->dev, "obsolete_probe: don't know probe type "
- "'%s', mapping as rom\n", of_probe);
+ dev_warn(&dev->dev, "obsolete_probe: don't know probe "
+ "type '%s', mapping as rom\n", of_probe);
return do_map_probe("mtd_rom", map);
}
}
-static int __devinit of_physmap_probe(struct of_device *dev, const struct of_device_id *match)
+static int __devinit of_flash_probe(struct of_device *dev,
+ const struct of_device_id *match)
{
struct device_node *dp = dev->node;
struct resource res;
- struct physmap_flash_info *info;
- const char *probe_type = (const char *)match->data;
+ struct of_flash *info;
+ const char *probe_type = match->data;
const u32 *width;
int err;
+ err = -ENXIO;
if (of_address_to_resource(dp, 0, &res)) {
- dev_err(&dev->dev, "Can't get the flash mapping!\n");
- err = -EINVAL;
+ dev_err(&dev->dev, "Can't get IO address from device tree\n");
goto err_out;
}
- dev_dbg(&dev->dev, "physmap flash device: %.8llx at %.8llx\n",
- (unsigned long long)res.end - res.start + 1,
- (unsigned long long)res.start);
+ dev_dbg(&dev->dev, "of_flash device: %.8llx-%.8llx\n",
+ (unsigned long long)res.start, (unsigned long long)res.end);
- info = kzalloc(sizeof(struct physmap_flash_info), GFP_KERNEL);
- if (info == NULL) {
- err = -ENOMEM;
+ err = -ENOMEM;
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (!info)
goto err_out;
- }
memset(info, 0, sizeof(*info));
dev_set_drvdata(&dev->dev, info);
+ err = -EBUSY;
info->res = request_mem_region(res.start, res.end - res.start + 1,
- dev->dev.bus_id);
- if (info->res == NULL) {
- dev_err(&dev->dev, "Could not reserve memory region\n");
- err = -ENOMEM;
+ dev->dev.bus_id);
+ if (!info->res)
goto err_out;
- }
+ err = -ENXIO;
width = of_get_property(dp, "bank-width", NULL);
- if (width == NULL) {
- dev_err(&dev->dev, "Can't get the flash bank width!\n");
- err = -EINVAL;
+ if (!width) {
+ dev_err(&dev->dev, "Can't get bank width from device tree\n");
goto err_out;
}
info->map.size = res.end - res.start + 1;
info->map.bankwidth = *width;
+ err = -ENOMEM;
info->map.virt = ioremap(info->map.phys, info->map.size);
- if (info->map.virt == NULL) {
- dev_err(&dev->dev, "Failed to ioremap flash region\n");
- err = EIO;
+ if (!info->map.virt) {
+ dev_err(&dev->dev, "Failed to ioremap() flash region\n");
goto err_out;
}
else
info->mtd = obsolete_probe(dev, &info->map);
- if (info->mtd == NULL) {
- dev_err(&dev->dev, "map_probe failed\n");
- err = -ENXIO;
+ err = -ENXIO;
+ if (!info->mtd) {
+ dev_err(&dev->dev, "do_map_probe() failed\n");
goto err_out;
}
info->mtd->owner = THIS_MODULE;
- return process_partitions(info, dev);
+ err = parse_partitions(info, dev);
+ if (err < 0)
+ goto err_out;
-err_out:
- of_physmap_remove(dev);
- return err;
+ if (err > 0)
+ add_mtd_partitions(info->mtd, OF_FLASH_PARTS(info), err);
+ else
+ add_mtd_device(info->mtd);
return 0;
-
+err_out:
+ of_flash_remove(dev);
+ return err;
}
-static struct of_device_id of_physmap_match[] = {
+static struct of_device_id of_flash_match[] = {
{
.compatible = "cfi-flash",
.data = (void *)"cfi_probe",
},
{ },
};
+MODULE_DEVICE_TABLE(of, of_flash_match);
-MODULE_DEVICE_TABLE(of, of_physmap_match);
-
-
-static struct of_platform_driver of_physmap_flash_driver = {
- .name = "physmap-flash",
- .match_table = of_physmap_match,
- .probe = of_physmap_probe,
- .remove = of_physmap_remove,
+static struct of_platform_driver of_flash_driver = {
+ .name = "of-flash",
+ .match_table = of_flash_match,
+ .probe = of_flash_probe,
+ .remove = of_flash_remove,
};
-static int __init of_physmap_init(void)
+static int __init of_flash_init(void)
{
- return of_register_platform_driver(&of_physmap_flash_driver);
+ return of_register_platform_driver(&of_flash_driver);
}
-static void __exit of_physmap_exit(void)
+static void __exit of_flash_exit(void)
{
- of_unregister_platform_driver(&of_physmap_flash_driver);
+ of_unregister_platform_driver(&of_flash_driver);
}
-module_init(of_physmap_init);
-module_exit(of_physmap_exit);
+module_init(of_flash_init);
+module_exit(of_flash_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Vitaly Wool <vwool@ru.mvista.com>");
-MODULE_DESCRIPTION("Configurable MTD map driver for OF");
+MODULE_DESCRIPTION("Device tree based MTD map driver");
projects / openwrt / staging / blogic.git / commitdiff