1 files changed, 168 insertions, 0 deletions

diff --git a/arch/arm/mach-mmp/sram.c b/arch/arm/mach-mmp/sram.c
new file mode 100644
index 000000000000..4304f9519372
--- /dev/null
+++ b/arch/arm/mach-mmp/sram.c
@@ -0,0 +1,168 @@
+/*
+ *  linux/arch/arm/mach-mmp/sram.c
+ *
+ *  based on mach-davinci/sram.c - DaVinci simple SRAM allocator
+ *
+ *  Copyright (c) 2011 Marvell Semiconductors Inc.
+ *  All Rights Reserved
+ *
+ *  Add for mmp sram support - Leo Yan <leoy@marvell.com>
+ *
+ *  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/init.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/genalloc.h>
+
+#include <mach/sram.h>
+
+struct sram_bank_info {
+	char *pool_name;
+	struct gen_pool *gpool;
+	int granularity;
+
+	phys_addr_t sram_phys;
+	void __iomem *sram_virt;
+	u32 sram_size;
+
+	struct list_head node;
+};
+
+static DEFINE_MUTEX(sram_lock);
+static LIST_HEAD(sram_bank_list);
+
+struct gen_pool *sram_get_gpool(char *pool_name)
+{
+	struct sram_bank_info *info = NULL;
+
+	if (!pool_name)
+		return NULL;
+
+	mutex_lock(&sram_lock);
+
+	list_for_each_entry(info, &sram_bank_list, node)
+		if (!strcmp(pool_name, info->pool_name))
+			break;
+
+	mutex_unlock(&sram_lock);
+
+	if (&info->node == &sram_bank_list)
+		return NULL;
+
+	return info->gpool;
+}
+EXPORT_SYMBOL(sram_get_gpool);
+
+static int __devinit sram_probe(struct platform_device *pdev)
+{
+	struct sram_platdata *pdata = pdev->dev.platform_data;
+	struct sram_bank_info *info;
+	struct resource *res;
+	int ret = 0;
+
+	if (!pdata && !pdata->pool_name)
+		return -ENODEV;
+
+	info = kzalloc(sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (res == NULL) {
+		dev_err(&pdev->dev, "no memory resource defined\n");
+		ret = -ENODEV;
+		goto out;
+	}
+
+	if (!resource_size(res))
+		return 0;
+
+	info->sram_phys   = (phys_addr_t)res->start;
+	info->sram_size   = resource_size(res);
+	info->sram_virt   = ioremap(info->sram_phys, info->sram_size);
+	info->pool_name	  = kstrdup(pdata->pool_name, GFP_KERNEL);
+	info->granularity = pdata->granularity;
+
+	info->gpool = gen_pool_create(ilog2(info->granularity), -1);
+	if (!info->gpool) {
+		dev_err(&pdev->dev, "create pool failed\n");
+		ret = -ENOMEM;
+		goto create_pool_err;
+	}
+
+	ret = gen_pool_add_virt(info->gpool, (unsigned long)info->sram_virt,
+				info->sram_phys, info->sram_size, -1);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "add new chunk failed\n");
+		ret = -ENOMEM;
+		goto add_chunk_err;
+	}
+
+	mutex_lock(&sram_lock);
+	list_add(&info->node, &sram_bank_list);
+	mutex_unlock(&sram_lock);
+
+	platform_set_drvdata(pdev, info);
+
+	dev_info(&pdev->dev, "initialized\n");
+	return 0;
+
+add_chunk_err:
+	gen_pool_destroy(info->gpool);
+create_pool_err:
+	iounmap(info->sram_virt);
+	kfree(info->pool_name);
+out:
+	kfree(info);
+	return ret;
+}
+
+static int __devexit sram_remove(struct platform_device *pdev)
+{
+	struct sram_bank_info *info;
+
+	info = platform_get_drvdata(pdev);
+	if (info == NULL)
+		return -ENODEV;
+
+	mutex_lock(&sram_lock);
+	list_del(&info->node);
+	mutex_unlock(&sram_lock);
+
+	gen_pool_destroy(info->gpool);
+	iounmap(info->sram_virt);
+	kfree(info->pool_name);
+	kfree(info);
+	return 0;
+}
+
+static const struct platform_device_id sram_id_table[] = {
+	{ "asram", MMP_ASRAM },
+	{ "isram", MMP_ISRAM },
+	{ }
+};
+
+static struct platform_driver sram_driver = {
+	.probe		= sram_probe,
+	.remove		= sram_remove,
+	.driver		= {
+		.name	= "mmp-sram",
+	},
+	.id_table	= sram_id_table,
+};
+
+static int __init sram_init(void)
+{
+	return platform_driver_register(&sram_driver);
+}
+core_initcall(sram_init);
+
+MODULE_LICENSE("GPL");