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authorDavid Woodhouse <dwmw2@infradead.org>2007-10-13 14:58:23 +0100
committerDavid Woodhouse <dwmw2@infradead.org>2007-10-13 14:58:23 +0100
commitebf8889bd1fe3615991ff4494635d237280652a2 (patch)
tree10fb735717122bbb86474339eac07f26e7ccdf40 /drivers/mtd/maps/physmap_of.c
parentb160292cc216a50fd0cd386b0bda2cd48352c73b (diff)
parent752097cec53eea111d087c545179b421e2bde98a (diff)
downloadlinaro-lsk-ebf8889bd1fe3615991ff4494635d237280652a2.tar.gz
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'drivers/mtd/maps/physmap_of.c')
-rw-r--r--drivers/mtd/maps/physmap_of.c345
1 files changed, 217 insertions, 128 deletions
diff --git a/drivers/mtd/maps/physmap_of.c b/drivers/mtd/maps/physmap_of.c
index fbd61396871..aeed9ea7971 100644
--- a/drivers/mtd/maps/physmap_of.c
+++ b/drivers/mtd/maps/physmap_of.c
@@ -1,9 +1,12 @@
/*
- * 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>
*
+ * Revised to handle newer style flash binding by:
+ * Copyright (C) 2007 David Gibson, IBM Corporation.
+ *
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
@@ -12,102 +15,157 @@
#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
- int nr_parts;
struct mtd_partition *parts;
#endif
};
-static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
#ifdef CONFIG_MTD_PARTITIONS
-static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
-#endif
+#define OF_FLASH_PARTS(info) ((info)->parts)
-#ifdef CONFIG_MTD_PARTITIONS
-static int parse_flash_partitions(struct device_node *node,
- struct mtd_partition **parts)
+static int parse_obsolete_partitions(struct of_device *dev,
+ struct of_flash *info,
+ struct device_node *dp)
{
- int i, plen, retval = -ENOMEM;
- const u32 *part;
- const char *name;
-
- part = of_get_property(node, "partitions", &plen);
- if (part == NULL)
- goto err;
-
- retval = plen / (2 * sizeof(u32));
- *parts = kzalloc(retval * sizeof(struct mtd_partition), GFP_KERNEL);
- if (*parts == NULL) {
- printk(KERN_ERR "Can't allocate the flash partition data!\n");
- goto err;
- }
+ int i, plen, nr_parts;
+ const struct {
+ u32 offset, len;
+ } *part;
+ const char *names;
+
+ part = of_get_property(dp, "partitions", &plen);
+ if (!part)
+ 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(*info->parts), GFP_KERNEL);
+ if (!info->parts)
+ return -ENOMEM;
- name = of_get_property(node, "partition-names", &plen);
+ names = of_get_property(dp, "partition-names", &plen);
- for (i = 0; i < retval; i++) {
- (*parts)[i].offset = *part++;
- (*parts)[i].size = *part & ~1;
- if (*part++ & 1) /* bit 0 set signifies read only partition */
- (*parts)[i].mask_flags = MTD_WRITEABLE;
+ for (i = 0; i < nr_parts; i++) {
+ info->parts[i].offset = part->offset;
+ info->parts[i].size = part->len & ~1;
+ if (part->len & 1) /* bit 0 set signifies read only partition */
+ info->parts[i].mask_flags = MTD_WRITEABLE;
- if (name != NULL && plen > 0) {
- int len = strlen(name) + 1;
+ if (names && (plen > 0)) {
+ int len = strlen(names) + 1;
- (*parts)[i].name = (char *)name;
+ info->parts[i].name = (char *)names;
plen -= len;
- name += len;
- } else
- (*parts)[i].name = "unnamed";
+ names += len;
+ } else {
+ info->parts[i].name = "unnamed";
+ }
+
+ part++;
}
-err:
- return retval;
+
+ return nr_parts;
}
-#endif
-static int of_physmap_remove(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[]
+ = { "cmdlinepart", "RedBoot", NULL };
+ struct device_node *dp = dev->node, *pp;
+ int nr_parts, i;
+
+ /* First look for RedBoot table or partitions on the command
+ * line, these take precedence over device tree information */
+ nr_parts = parse_mtd_partitions(info->mtd, part_probe_types,
+ &info->parts, 0);
+ if (nr_parts > 0) {
+ add_mtd_partitions(info->mtd, info->parts, nr_parts);
+ return 0;
+ }
+
+ /* First count the subnodes */
+ nr_parts = 0;
+ for (pp = dp->child; pp; pp = pp->sibling)
+ nr_parts++;
+
+ 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;
+ }
+
+ return nr_parts;
+}
+#else /* MTD_PARTITIONS */
+#define OF_FLASH_PARTS(info) (0)
+#define parse_partitions(info, dev) (0)
+#endif /* MTD_PARTITIONS */
+
+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->nr_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);
}
@@ -115,47 +173,78 @@ static int of_physmap_remove(struct of_device *dev)
return 0;
}
-static int __devinit of_physmap_probe(struct of_device *dev, const struct of_device_id *match)
+/* Helper function to handle probing of the obsolete "direct-mapped"
+ * compatible binding, which has an extra "probe-type" property
+ * describing the type of flash probe necessary. */
+static struct mtd_info * __devinit obsolete_probe(struct of_device *dev,
+ struct map_info *map)
{
struct device_node *dp = dev->node;
- struct resource res;
- struct physmap_flash_info *info;
- const char **probe_type;
const char *of_probe;
+ struct mtd_info *mtd;
+ static const char *rom_probe_types[]
+ = { "cfi_probe", "jedec_probe", "map_rom"};
+ int i;
+
+ dev_warn(&dev->dev, "Device tree uses obsolete \"direct-mapped\" "
+ "flash binding\n");
+
+ of_probe = of_get_property(dp, "probe-type", NULL);
+ if (!of_probe) {
+ for (i = 0; i < ARRAY_SIZE(rom_probe_types); i++) {
+ mtd = do_map_probe(rom_probe_types[i], map);
+ if (mtd)
+ return mtd;
+ }
+ return NULL;
+ } else if (strcmp(of_probe, "CFI") == 0) {
+ return do_map_probe("cfi_probe", map);
+ } else if (strcmp(of_probe, "JEDEC") == 0) {
+ return do_map_probe("jedec_probe", map);
+ } else {
+ if (strcmp(of_probe, "ROM") != 0)
+ 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_flash_probe(struct of_device *dev,
+ const struct of_device_id *match)
+{
+ struct device_node *dp = dev->node;
+ struct resource res;
+ 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;
- }
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;
}
@@ -164,87 +253,87 @@ static int __devinit of_physmap_probe(struct of_device *dev, const struct of_dev
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;
}
simple_map_init(&info->map);
- of_probe = of_get_property(dp, "probe-type", NULL);
- if (of_probe == NULL) {
- probe_type = rom_probe_types;
- for (; info->mtd == NULL && *probe_type != NULL; probe_type++)
- info->mtd = do_map_probe(*probe_type, &info->map);
- } else if (!strcmp(of_probe, "CFI"))
- info->mtd = do_map_probe("cfi_probe", &info->map);
- else if (!strcmp(of_probe, "JEDEC"))
- info->mtd = do_map_probe("jedec_probe", &info->map);
- else {
- if (strcmp(of_probe, "ROM"))
- dev_dbg(&dev->dev, "map_probe: don't know probe type "
- "'%s', mapping as rom\n", of_probe);
- info->mtd = do_map_probe("mtd_rom", &info->map);
- }
- if (info->mtd == NULL) {
- dev_err(&dev->dev, "map_probe failed\n");
- err = -ENXIO;
+ if (probe_type)
+ info->mtd = do_map_probe(probe_type, &info->map);
+ else
+ info->mtd = obsolete_probe(dev, &info->map);
+
+ err = -ENXIO;
+ if (!info->mtd) {
+ dev_err(&dev->dev, "do_map_probe() failed\n");
goto err_out;
}
info->mtd->owner = THIS_MODULE;
-#ifdef CONFIG_MTD_PARTITIONS
- err = parse_mtd_partitions(info->mtd, part_probe_types, &info->parts, 0);
- if (err > 0) {
- add_mtd_partitions(info->mtd, info->parts, err);
- } else if ((err = parse_flash_partitions(dp, &info->parts)) > 0) {
- dev_info(&dev->dev, "Using OF partition information\n");
- add_mtd_partitions(info->mtd, info->parts, err);
- info->nr_parts = err;
- } else
-#endif
+ err = parse_partitions(info, dev);
+ if (err < 0)
+ goto err_out;
+
+ if (err > 0)
+ add_mtd_partitions(info->mtd, OF_FLASH_PARTS(info), err);
+ else
+ add_mtd_device(info->mtd);
- add_mtd_device(info->mtd);
return 0;
err_out:
- of_physmap_remove(dev);
+ 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",
+ },
+ {
+ /* FIXME: JEDEC chips can't be safely and reliably
+ * probed, although the mtd code gets it right in
+ * practice most of the time. We should use the
+ * vendor and device ids specified by the binding to
+ * bypass the heuristic probe code, but the mtd layer
+ * provides, at present, no interface for doing so
+ * :(. */
+ .compatible = "jedec-flash",
+ .data = (void *)"jedec_probe",
+ },
{
.type = "rom",
.compatible = "direct-mapped"
},
{ },
};
+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");