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Message-Id: <1232460738-4714-4-git-send-email-anemo@mba.ocn.ne.jp>
Date: Tue, 20 Jan 2009 23:12:18 +0900
From: Atsushi Nemoto <anemo@....ocn.ne.jp>
To: linux-mips@...ux-mips.org
Cc: ralf@...ux-mips.org, linux-mtd@...ts.infradead.org,
dwmw2@...radead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/5] MTD: RBTX4939 map driver
This is a map driver for NOR flash chips on RBTX4939 board.
Signed-off-by: Atsushi Nemoto <anemo@....ocn.ne.jp>
---
drivers/mtd/maps/Kconfig | 6 +
drivers/mtd/maps/Makefile | 1 +
drivers/mtd/maps/rbtx4939-flash.c | 205 +++++++++++++++++++++++++++++++++++++
3 files changed, 212 insertions(+), 0 deletions(-)
create mode 100644 drivers/mtd/maps/rbtx4939-flash.c
diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig
index 0225cbb..162f32b 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 6d9ba35..f53a7dc 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 0000000..389b60f
--- /dev/null
+++ b/drivers/mtd/maps/rbtx4939-flash.c
@@ -0,0 +1,205 @@
+/*
+ * 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@....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;
+#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 || 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;
+#ifdef CONFIG_MTD_PARTITIONS
+ struct mtd_partition *parts;
+#endif
+
+ 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, &parts, 0);
+ if (err > 0) {
+ add_mtd_partitions(info->mtd, 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");
--
1.5.6.3
--
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