[MTD] RBTX4939 map driver

This is a map driver for NOR flash chips on RBTX4939 board.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: Ralf Bächle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

3 files changed, 215 insertions, 0 deletions

diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig
index 043d50fb6ef6..a0da8e243cc4 100644
--- a/drivers/mtd/maps/Kconfig
+++ b/drivers/mtd/maps/Kconfig
@@ -542,6 +542,12 @@ config MTD_INTEL_VR_NOR
           Map driver for a NOR flash bank located on the Expansion Bus of the
           Intel Vermilion Range chipset.
 
+config MTD_RBTX4939
+        tristate "Map driver for RBTX4939 board"
+        depends on TOSHIBA_RBTX4939 && MTD_CFI && MTD_COMPLEX_MAPPINGS
+        help
+          Map driver for NOR flash chips on RBTX4939 board.
+
 config MTD_PLATRAM
         tristate "Map driver for platform device RAM (mtd-ram)"
         select MTD_RAM
diff --git a/drivers/mtd/maps/Makefile b/drivers/mtd/maps/Makefile
index 6d9ba35caf11..f53a7dc4a4fb 100644
--- a/drivers/mtd/maps/Makefile
+++ b/drivers/mtd/maps/Makefile
@@ -61,3 +61,4 @@ obj-$(CONFIG_MTD_PLATRAM)	+= plat-ram.o
 obj-$(CONFIG_MTD_OMAP_NOR)      += omap_nor.o
 obj-$(CONFIG_MTD_INTEL_VR_NOR)  += intel_vr_nor.o
 obj-$(CONFIG_MTD_BFIN_ASYNC)    += bfin-async-flash.o
+obj-$(CONFIG_MTD_RBTX4939)      += rbtx4939-flash.o
diff --git a/drivers/mtd/maps/rbtx4939-flash.c b/drivers/mtd/maps/rbtx4939-flash.c
new file mode 100644
index 000000000000..d39f0adac846
--- /dev/null
+++ b/drivers/mtd/maps/rbtx4939-flash.c
@@ -0,0 +1,208 @@
+/*
+ * rbtx4939-flash (based on physmap.c)
+ *
+ * This is a simplified physmap driver with map_init callback function.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Copyright (C) 2009 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
+ */
+
+#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 <asm/txx9/rbtx4939.h>
+
+struct rbtx4939_flash_info {
+        struct mtd_info *mtd;
+        struct map_info map;
+#ifdef CONFIG_MTD_PARTITIONS
+        int nr_parts;
+        struct mtd_partition *parts;
+#endif
+};
+
+static int rbtx4939_flash_remove(struct platform_device *dev)
+{
+        struct rbtx4939_flash_info *info;
+
+        info = platform_get_drvdata(dev);
+        if (!info)
+                return 0;
+        platform_set_drvdata(dev, NULL);
+
+        if (info->mtd) {
+#ifdef CONFIG_MTD_PARTITIONS
+                struct rbtx4939_flash_data *pdata = dev->dev.platform_data;
+
+                if (info->nr_parts) {
+                        del_mtd_partitions(info->mtd);
+                        kfree(info->parts);
+                } else if (pdata->nr_parts)
+                        del_mtd_partitions(info->mtd);
+                else
+                        del_mtd_device(info->mtd);
+#else
+                del_mtd_device(info->mtd);
+#endif
+                map_destroy(info->mtd);
+        }
+        return 0;
+}
+
+static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL };
+#ifdef CONFIG_MTD_PARTITIONS
+static const char *part_probe_types[] = { "cmdlinepart", NULL };
+#endif
+
+static int rbtx4939_flash_probe(struct platform_device *dev)
+{
+        struct rbtx4939_flash_data *pdata;
+        struct rbtx4939_flash_info *info;
+        struct resource *res;
+        const char **probe_type;
+        int err = 0;
+        unsigned long size;
+
+        pdata = dev->dev.platform_data;
+        if (!pdata)
+                return -ENODEV;
+
+        res = platform_get_resource(dev, IORESOURCE_MEM, 0);
+        if (!res)
+                return -ENODEV;
+        info = devm_kzalloc(&dev->dev, sizeof(struct rbtx4939_flash_info),
+                            GFP_KERNEL);
+        if (!info)
+                return -ENOMEM;
+
+        platform_set_drvdata(dev, info);
+
+        size = resource_size(res);
+        pr_notice("rbtx4939 platform flash device: %pR\n", res);
+
+        if (!devm_request_mem_region(&dev->dev, res->start, size,
+                                     dev_name(&dev->dev)))
+                return -EBUSY;
+
+        info->map.name = dev_name(&dev->dev);
+        info->map.phys = res->start;
+        info->map.size = size;
+        info->map.bankwidth = pdata->width;
+
+        info->map.virt = devm_ioremap(&dev->dev, info->map.phys, size);
+        if (!info->map.virt)
+                return -EBUSY;
+
+        if (pdata->map_init)
+                (*pdata->map_init)(&info->map);
+        else
+                simple_map_init(&info->map);
+
+        probe_type = rom_probe_types;
+        for (; !info->mtd && *probe_type; probe_type++)
+                info->mtd = do_map_probe(*probe_type, &info->map);
+        if (!info->mtd) {
+                dev_err(&dev->dev, "map_probe failed\n");
+                err = -ENXIO;
+                goto err_out;
+        }
+        info->mtd->owner = THIS_MODULE;
+        if (err)
+                goto err_out;
+
+#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);
+                info->nr_parts = err;
+                return 0;
+        }
+
+        if (pdata->nr_parts) {
+                pr_notice("Using rbtx4939 partition information\n");
+                add_mtd_partitions(info->mtd, pdata->parts, pdata->nr_parts);
+                return 0;
+        }
+#endif
+
+        add_mtd_device(info->mtd);
+        return 0;
+
+err_out:
+        rbtx4939_flash_remove(dev);
+        return err;
+}
+
+#ifdef CONFIG_PM
+static int rbtx4939_flash_suspend(struct platform_device *dev,
+                                  pm_message_t state)
+{
+        struct rbtx4939_flash_info *info = platform_get_drvdata(dev);
+
+        if (info->mtd->suspend)
+                return info->mtd->suspend(info->mtd);
+        return 0;
+}
+
+static int rbtx4939_flash_resume(struct platform_device *dev)
+{
+        struct rbtx4939_flash_info *info = platform_get_drvdata(dev);
+
+        if (info->mtd->resume)
+                info->mtd->resume(info->mtd);
+        return 0;
+}
+
+static void rbtx4939_flash_shutdown(struct platform_device *dev)
+{
+        struct rbtx4939_flash_info *info = platform_get_drvdata(dev);
+
+        if (info->mtd->suspend && info->mtd->resume)
+                if (info->mtd->suspend(info->mtd) == 0)
+                        info->mtd->resume(info->mtd);
+}
+#else
+#define rbtx4939_flash_suspend NULL
+#define rbtx4939_flash_resume NULL
+#define rbtx4939_flash_shutdown NULL
+#endif
+
+static struct platform_driver rbtx4939_flash_driver = {
+        .probe          = rbtx4939_flash_probe,
+        .remove         = rbtx4939_flash_remove,
+        .suspend        = rbtx4939_flash_suspend,
+        .resume         = rbtx4939_flash_resume,
+        .shutdown       = rbtx4939_flash_shutdown,
+        .driver         = {
+                .name   = "rbtx4939-flash",
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init rbtx4939_flash_init(void)
+{
+        return platform_driver_register(&rbtx4939_flash_driver);
+}
+
+static void __exit rbtx4939_flash_exit(void)
+{
+        platform_driver_unregister(&rbtx4939_flash_driver);
+}
+
+module_init(rbtx4939_flash_init);
+module_exit(rbtx4939_flash_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("RBTX4939 MTD map driver");
+MODULE_ALIAS("platform:rbtx4939-flash");