S5PC11X: Partition: modified to get partition info from bootloader

Bootloader send partition info to kernel via ATAG.
Otherwise default partition which kernel has can be used.

Change-Id: I47bc5e12e9e9e44e27ddbe871ea1a5799f755360

1 files changed, 53 insertions, 2 deletions

diff --git a/drivers/mtd/onenand/samsung.c b/drivers/mtd/onenand/samsung.c
index 26bafdef6e7..3bd5988155e 100644
--- a/drivers/mtd/onenand/samsung.c
+++ b/drivers/mtd/onenand/samsung.c
@@ -29,6 +29,9 @@
 
 #include <linux/io.h>
 
+#include <asm/setup.h>
+#include <linux/string.h>
+
 enum soc_type {
 	TYPE_S3C6400,
 	TYPE_S3C6410,
@@ -232,6 +235,56 @@ static void s3c_dump_reg(void)
 }
 #endif
 
+struct slsi_ptbl_entry {
+	char name[16];
+	__u32 offset;
+	__u32 size;
+	__u32 flags;
+};
+
+struct mtd_partition *partitions;
+int num_partitions;
+
+#define MAX_PARTITIONS 12
+#define ATAG_SLSI_PARTITION 0x28247574
+struct mtd_partition slsi_nand_partitions[MAX_PARTITIONS];
+char slsi_nand_names[MAX_PARTITIONS * 16];
+
+static int __init parse_tag_partition(const struct tag *tag)
+{
+	struct mtd_partition *ptn = slsi_nand_partitions;
+	char *name = slsi_nand_names;
+	struct slsi_ptbl_entry *entry = (void *) &tag->u;
+	unsigned count, n;
+
+	count = (tag->hdr.size - 2) /
+		(sizeof(struct slsi_ptbl_entry) / sizeof(__u32));
+
+	if (count > MAX_PARTITIONS)
+		count = MAX_PARTITIONS;
+
+	for (n = 0; n < count; n++) {
+		memcpy(name, entry->name, 15);
+		name[15] = 0;
+		ptn->name = name;
+		ptn->offset = entry->offset;
+		ptn->size = entry->size;
+
+		printk(KERN_INFO "Partition (from atag) %15s -- Offset:0x%08x Size:0x%08x\n",
+				entry->name, entry->offset, entry->size);
+
+		name += 16;
+		entry++;
+		ptn++;
+	}
+
+	num_partitions = count;
+	partitions = slsi_nand_partitions;
+
+	return 0;
+}
+__tagtable(ATAG_SLSI_PARTITION, parse_tag_partition);
+
 static unsigned int s3c64xx_cmd_map(unsigned type, unsigned val)
 {
 	return (type << S3C64XX_CMD_MAP_SHIFT) | val;
@@ -908,8 +961,6 @@ static int s3c_onenand_probe(struct platform_device *pdev)
 	struct mtd_info *mtd;
 	struct resource *r;
 	int size, err;
-	struct mtd_partition *partitions =  NULL;
-	int num_partitions = 0;
 
 	pdata = pdev->dev.platform_data;
 	/* No need to check pdata. the platform data is optional */