3 files changed, 265 insertions, 0 deletions

diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig
index fa7466886fd6..4a51a3d639be 100644
--- a/drivers/mtd/maps/Kconfig
+++ b/drivers/mtd/maps/Kconfig
@@ -60,6 +60,15 @@ config MTD_PHYSMAP_BANKWIDTH
           Ignore this option if you use run-time physmap configuration
           (i.e., run-time calling physmap_configure()).
 
+config MTD_PHYSMAP_OF
+        tristate "Flash device in physical memory map based on OF descirption"
+        depends on PPC_OF && (MTD_CFI || MTD_JEDECPROBE || MTD_ROM)
+        help
+          This provides a 'mapping' driver which allows the NOR Flash and
+          ROM driver code to communicate with chips which are mapped
+          physically into the CPU's memory. The mapping description here is
+          taken from OF device tree.
+
 config MTD_SUN_UFLASH
         tristate "Sun Microsystems userflash support"
         depends on SPARC && MTD_CFI
diff --git a/drivers/mtd/maps/Makefile b/drivers/mtd/maps/Makefile
index 34505216d403..df019be753e3 100644
--- a/drivers/mtd/maps/Makefile
+++ b/drivers/mtd/maps/Makefile
@@ -27,6 +27,7 @@ obj-$(CONFIG_MTD_MBX860)	+= mbx860.o
 obj-$(CONFIG_MTD_CEIVA)         += ceiva.o
 obj-$(CONFIG_MTD_OCTAGON)       += octagon-5066.o
 obj-$(CONFIG_MTD_PHYSMAP)       += physmap.o
+obj-$(CONFIG_MTD_PHYSMAP_OF)    += physmap_of.o
 obj-$(CONFIG_MTD_PNC2000)       += pnc2000.o
 obj-$(CONFIG_MTD_PCMCIA)        += pcmciamtd.o
 obj-$(CONFIG_MTD_RPXLITE)       += rpxlite.o
diff --git a/drivers/mtd/maps/physmap_of.c b/drivers/mtd/maps/physmap_of.c
new file mode 100644
index 000000000000..7efe744ad31e
--- /dev/null
+++ b/drivers/mtd/maps/physmap_of.c
@@ -0,0 +1,255 @@
+/*
+ * Normal mappings of chips in physical memory for OF devices
+ *
+ * Copyright (C) 2006 MontaVista Software Inc.
+ * Author: Vitaly Wool <vwool@ru.mvista.com>
+ *
+ * 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
+ * option) any later version.
+ */
+
+#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>
+
+struct physmap_flash_info {
+        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
+
+#ifdef CONFIG_MTD_PARTITIONS
+static int parse_flash_partitions(struct device_node *node,
+                struct mtd_partition **parts)
+{
+        int i, plen, retval = -ENOMEM;
+        const  u32  *part;
+        const  char *name;
+
+        part = 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;
+        }
+
+        name = get_property(node, "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;
+
+                if (name != NULL && plen > 0) {
+                        int len = strlen(name) + 1;
+
+                        (*parts)[i].name = (char *)name;
+                        plen -= len;
+                        name += len;
+                } else
+                        (*parts)[i].name = "unnamed";
+        }
+err:
+        return retval;
+}
+#endif
+
+static int of_physmap_remove(struct of_device *dev)
+{
+        struct physmap_flash_info *info;
+
+        info = dev_get_drvdata(&dev->dev);
+        if (info == NULL)
+                return 0;
+        dev_set_drvdata(&dev->dev, NULL);
+
+        if (info->mtd != NULL) {
+#ifdef CONFIG_MTD_PARTITIONS
+                if (info->nr_parts) {
+                        del_mtd_partitions(info->mtd);
+                        kfree(info->parts);
+                } else {
+                        del_mtd_device(info->mtd);
+                }
+#else
+                del_mtd_device(info->mtd);
+#endif
+                map_destroy(info->mtd);
+        }
+
+        if (info->map.virt != NULL)
+                iounmap(info->map.virt);
+
+        if (info->res != NULL) {
+                release_resource(info->res);
+                kfree(info->res);
+        }
+
+        return 0;
+}
+
+static int __devinit of_physmap_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 *of_probe;
+        const u32 *width;
+        int err;
+
+
+        if (of_address_to_resource(dp, 0, &res)) {
+                dev_err(&dev->dev, "Can't get the flash mapping!\n");
+                err = -EINVAL;
+                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);
+
+        info = kzalloc(sizeof(struct physmap_flash_info), GFP_KERNEL);
+        if (info == NULL) {
+                err = -ENOMEM;
+                goto err_out;
+        }
+        memset(info, 0, sizeof(*info));
+
+        dev_set_drvdata(&dev->dev, info);
+
+        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;
+                goto err_out;
+        }
+
+        width = get_property(dp, "bank-width", NULL);
+        if (width == NULL) {
+                dev_err(&dev->dev, "Can't get the flash bank width!\n");
+                err = -EINVAL;
+                goto err_out;
+        }
+
+        info->map.name = dev->dev.bus_id;
+        info->map.phys = res.start;
+        info->map.size = res.end - res.start + 1;
+        info->map.bankwidth = *width;
+
+        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;
+                goto err_out;
+        }
+
+        simple_map_init(&info->map);
+
+        of_probe = 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");
+                info->mtd = do_map_probe("mtd_rom", &info->map);
+        }
+        if (info->mtd == NULL) {
+                dev_err(&dev->dev, "map_probe failed\n");
+                err = -ENXIO;
+                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
+
+        add_mtd_device(info->mtd);
+        return 0;
+
+err_out:
+        of_physmap_remove(dev);
+        return err;
+
+        return 0;
+
+
+}
+
+static struct of_device_id of_physmap_match[] = {
+        {
+                .type           = "rom",
+                .compatible     = "direct-mapped"
+        },
+        { },
+};
+
+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 int __init of_physmap_init(void)
+{
+        return of_register_platform_driver(&of_physmap_flash_driver);
+}
+
+static void __exit of_physmap_exit(void)
+{
+        of_unregister_platform_driver(&of_physmap_flash_driver);
+}
+
+module_init(of_physmap_init);
+module_exit(of_physmap_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Vitaly Wool <vwool@ru.mvista.com>");
+MODULE_DESCRIPTION("Configurable MTD map driver for OF");