add parallel flash driver

SVN-Revision: 16353

1 files changed, 268 insertions, 0 deletions

diff --git a/target/linux/ar71xx/files/drivers/mtd/maps/ar91xx_flash.c b/target/linux/ar71xx/files/drivers/mtd/maps/ar91xx_flash.c
new file mode 100644
index 0000000000..e83a1477f0
--- /dev/null
+++ b/target/linux/ar71xx/files/drivers/mtd/maps/ar91xx_flash.c
@@ -0,0 +1,268 @@
+/*
+ * Parallel flash driver for the Atheros AR91xx SoC
+ *
+ * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * 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.
+ *
+ */
+
+#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 <linux/io.h>
+
+#include <asm/mach-ar71xx/ar71xx.h>
+#include <asm/mach-ar71xx/platform.h>
+
+#define DRV_NAME	"ar91xx-flash"
+
+struct ar91xx_flash_info {
+	struct mtd_info		*mtd;
+	struct map_info		map;
+#ifdef CONFIG_MTD_PARTITIONS
+	int			nr_parts;
+	struct mtd_partition	*parts;
+#endif
+};
+
+static map_word ar91xx_flash_read(struct map_info *map, unsigned long ofs)
+{
+	map_word val;
+
+	if (map_bankwidth_is_1(map))
+		val.x[0] = __raw_readb(map->virt + (ofs ^ 3));
+	else if (map_bankwidth_is_2(map))
+		val.x[0] = __raw_readw(map->virt + (ofs ^ 2));
+	else
+		val = map_word_ff(map);
+
+	return val;
+}
+
+static void ar91xx_flash_write(struct map_info *map, map_word d,
+			       unsigned long ofs)
+{
+	if (map_bankwidth_is_1(map))
+		__raw_writeb(d.x[0], map->virt + (ofs ^ 3));
+	else if (map_bankwidth_is_2(map))
+		__raw_writew(d.x[0], map->virt + (ofs ^ 2));
+
+	mb();
+}
+
+static int ar91xx_flash_remove(struct platform_device *pdev)
+{
+	struct ar91xx_flash_platform_data *pdata;
+	struct ar91xx_flash_info *info;
+
+	info = platform_get_drvdata(pdev);
+	if (info == NULL)
+		return 0;
+
+	platform_set_drvdata(pdev, NULL);
+
+	if (info->mtd == NULL)
+		return 0;
+
+	pdata = pdev->dev.platform_data;
+#ifdef CONFIG_MTD_PARTITIONS
+	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", "RedBoot", NULL };
+#endif
+
+static int ar91xx_flash_probe(struct platform_device *pdev)
+{
+	struct ar91xx_flash_platform_data *pdata;
+	struct ar91xx_flash_info *info;
+	struct resource *res;
+	struct resource *region;
+	const char **probe_type;
+	int err = 0;
+
+	pdata = pdev->dev.platform_data;
+	if (pdata == NULL)
+		return -EINVAL;
+
+	info = devm_kzalloc(&pdev->dev, sizeof(struct ar91xx_flash_info),
+			    GFP_KERNEL);
+	if (info == NULL) {
+		err = -ENOMEM;
+		goto err_out;
+	}
+
+	platform_set_drvdata(pdev, info);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (res == NULL) {
+		err = -ENOENT;
+		goto err_out;
+	}
+
+	dev_info(&pdev->dev, "%.8llx at %.8llx\n",
+		 (unsigned long long)(res->end - res->start + 1),
+		 (unsigned long long)res->start);
+
+	region = devm_request_mem_region(&pdev->dev,
+					 res->start, res->end - res->start + 1,
+					 dev_name(&pdev->dev));
+	if (region == NULL) {
+		dev_err(&pdev->dev, "could not reserve memory region\n");
+		err = -ENOMEM;
+		goto err_out;
+	}
+
+	info->map.name = dev_name(&pdev->dev);
+	info->map.phys = res->start;
+	info->map.size = res->end - res->start + 1;
+	info->map.bankwidth = pdata->width;
+
+	info->map.virt = devm_ioremap(&pdev->dev, info->map.phys,
+				      info->map.size);
+	if (info->map.virt == NULL) {
+		dev_err(&pdev->dev, "failed to ioremap flash region\n");
+		err = -EIO;
+		goto err_out;
+	}
+
+	simple_map_init(&info->map);
+	info->map.read = ar91xx_flash_read;
+	info->map.write = ar91xx_flash_write;
+
+	probe_type = rom_probe_types;
+	for (; info->mtd == NULL && *probe_type != NULL; probe_type++)
+		info->mtd = do_map_probe(*probe_type, &info->map);
+
+	if (info->mtd == NULL) {
+		dev_err(&pdev->dev, "map_probe failed\n");
+		err = -ENXIO;
+		goto err_out;
+	}
+
+	info->mtd->owner = THIS_MODULE;
+
+#ifdef CONFIG_MTD_PARTITIONS
+	if (pdata->nr_parts) {
+		dev_info(&pdev->dev, "using static partition mapping\n");
+		add_mtd_partitions(info->mtd, pdata->parts, pdata->nr_parts);
+		return 0;
+	}
+
+	err = parse_mtd_partitions(info->mtd, part_probe_types,
+				   &info->parts, 0);
+	if (err > 0) {
+		add_mtd_partitions(info->mtd, info->parts, err);
+		return 0;
+	}
+#endif
+
+	add_mtd_device(info->mtd);
+	return 0;
+
+ err_out:
+	ar91xx_flash_remove(pdev);
+	return err;
+}
+
+#ifdef CONFIG_PM
+static int ar91xx_flash_suspend(struct platform_device *dev, pm_message_t state)
+{
+	struct ar91xx_flash_info *info = platform_get_drvdata(dev);
+	int ret = 0;
+
+	if (info->mtd->suspend)
+		ret = info->mtd->suspend(info->mtd);
+
+	if (ret)
+		goto fail;
+
+	return 0;
+
+ fail:
+	if (info->mtd->suspend) {
+		BUG_ON(!info->mtd->resume);
+		info->mtd->resume(info->mtd);
+	}
+
+	return ret;
+}
+
+static int ar91xx_flash_resume(struct platform_device *pdev)
+{
+	struct ar91xx_flash_info *info = platform_get_drvdata(pdev);
+
+	if (info->mtd->resume)
+		info->mtd->resume(info->mtd);
+
+	return 0;
+}
+
+static void ar91xx_flash_shutdown(struct platform_device *pdev)
+{
+	struct ar91xx_flash_info *info = platform_get_drvdata(pdev);
+
+	if (info->mtd->suspend && info->mtd->resume)
+		if (info->mtd->suspend(info->mtd) == 0)
+			info->mtd->resume(info->mtd);
+}
+#else
+#define ar91xx_flash_suspend	NULL
+#define ar91xx_flash_resume	NULL
+#define ar91xx_flash_shutdown	NULL
+#endif
+
+static struct platform_driver ar91xx_flash_driver = {
+	.probe		= ar91xx_flash_probe,
+	.remove		= ar91xx_flash_remove,
+	.suspend	= ar91xx_flash_suspend,
+	.resume		= ar91xx_flash_resume,
+	.shutdown	= ar91xx_flash_shutdown,
+	.driver		= {
+		.name	= DRV_NAME,
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init ar91xx_flash_init(void)
+{
+	return platform_driver_register(&ar91xx_flash_driver);
+}
+
+static void __exit ar91xx_flash_exit(void)
+{
+	platform_driver_unregister(&ar91xx_flash_driver);
+}
+
+module_init(ar91xx_flash_init);
+module_exit(ar91xx_flash_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
+MODULE_DESCRIPTION("Parallel flash driver for the Atheros AR91xx SoC");
+MODULE_ALIAS("platform:" DRV_NAME);