From 2a3a18045b136487b22733d57410e6dccd34ac84 Mon Sep 17 00:00:00 2001
From: Ben Dooks <ben-linux@fluff.org>
Date: Mon, 28 Sep 2009 13:59:49 +0300
Subject: ARM: S3C: Add NAND device platform data set call

---
 arch/arm/plat-s3c/dev-nand.c          | 97 +++++++++++++++++++++++++++++++++++
 arch/arm/plat-s3c/include/plat/nand.h |  8 +++
 2 files changed, 105 insertions(+)

(limited to 'arch/arm/plat-s3c')

diff --git a/arch/arm/plat-s3c/dev-nand.c b/arch/arm/plat-s3c/dev-nand.c
index 4e5323732434..e771e77dcd54 100644
--- a/arch/arm/plat-s3c/dev-nand.c
+++ b/arch/arm/plat-s3c/dev-nand.c
@@ -9,8 +9,12 @@
 #include <linux/kernel.h>
 #include <linux/platform_device.h>
 
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+
 #include <mach/map.h>
 #include <plat/devs.h>
+#include <plat/nand.h>
 
 static struct resource s3c_nand_resource[] = {
 	[0] = {
@@ -28,3 +32,96 @@ struct platform_device s3c_device_nand = {
 };
 
 EXPORT_SYMBOL(s3c_device_nand);
+
+/**
+ * s3c_nand_copy_set() - copy nand set data
+ * @set: The new structure, directly copied from the old.
+ *
+ * Copy all the fields from the NAND set field from what is probably __initdata
+ * to new kernel memory. The code returns 0 if the copy happened correctly or
+ * an error code for the calling function to display.
+ *
+ * Note, we currently do not try and look to see if we've already copied the
+ * data in a previous set.
+ */
+static int __init s3c_nand_copy_set(struct s3c2410_nand_set *set)
+{
+	void *ptr;
+	int size;
+
+	size = sizeof(struct mtd_partition) * set->nr_partitions;
+	if (size) {
+		ptr = kmemdup(set->partitions, size, GFP_KERNEL);
+		set->partitions = ptr;
+
+		if (!ptr)
+			return -ENOMEM;
+	}
+	
+	size = sizeof(int) * set->nr_chips;
+	if (size) {
+		ptr = kmemdup(set->nr_map, size, GFP_KERNEL);
+		set->nr_map = ptr;
+
+		if (!ptr)
+			return -ENOMEM;
+	}
+
+	if (set->ecc_layout) {
+		ptr = kmemdup(set->ecc_layout,
+			      sizeof(struct nand_ecclayout), GFP_KERNEL);
+		set->ecc_layout = ptr;
+
+		if (!ptr)
+			return -ENOMEM;
+	}
+	
+	return 0;
+}
+
+void __init s3c_nand_set_platdata(struct s3c2410_platform_nand *nand)
+{
+	struct s3c2410_platform_nand *npd;
+	int size;
+	int ret;
+
+	/* note, if we get a failure in allocation, we simply drop out of the
+	 * function. If there is so little memory available at initialisation
+	 * time then there is little chance the system is going to run.
+	 */ 
+
+	npd = kmemdup(nand, sizeof(struct s3c2410_platform_nand), GFP_KERNEL);
+	if (!npd) {
+		printk(KERN_ERR "%s: failed copying platform data\n", __func__);
+		return;
+	}
+
+	/* now see if we need to copy any of the nand set data */
+
+	size = sizeof(struct s3c2410_nand_set) * npd->nr_sets;
+	if (size) {
+		struct s3c2410_nand_set *from = npd->sets;
+		struct s3c2410_nand_set *to;
+		int i;
+
+		to = kmemdup(from, size, GFP_KERNEL);
+		npd->sets = to;	/* set, even if we failed */
+
+		if (!to) {
+			printk(KERN_ERR "%s: no memory for sets\n", __func__);
+			return;
+		}
+		
+		for (i = 0; i < npd->nr_sets; i++) {
+			ret = s3c_nand_copy_set(to);
+			if (!ret) {
+				printk(KERN_ERR "%s: failed to copy set %d\n",
+				__func__, i);
+				return;
+			}
+			to++;
+		}
+	}
+}
+
+EXPORT_SYMBOL_GPL(s3c_nand_set_platdata);
diff --git a/arch/arm/plat-s3c/include/plat/nand.h b/arch/arm/plat-s3c/include/plat/nand.h
index 18f958801e64..065985978413 100644
--- a/arch/arm/plat-s3c/include/plat/nand.h
+++ b/arch/arm/plat-s3c/include/plat/nand.h
@@ -55,3 +55,11 @@ struct s3c2410_platform_nand {
 					       int chip);
 };
 
+/**
+ * s3c_nand_set_platdata() - register NAND platform data.
+ * @nand: The NAND platform data to register with s3c_device_nand.
+ *
+ * This function copies the given NAND platform data, @nand and registers
+ * it with the s3c_device_nand. This allows @nand to be __initdata.
+*/
+extern void s3c_nand_set_platdata(struct s3c2410_platform_nand *nand);
-- 
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