From: Zhaoyifeng <zyf@rock-chips.com>
Date: Tue, 21 Apr 2015 04:57:56 +0000 (+0800)
Subject:     NAND  : add boot media check
X-Git-Tag: firefly_0821_release~4158^2~172
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=627fe3d23eb4fff2f705a5bd604fc21556f4a2a8;p=firefly-linux-kernel-4.4.55.git

NAND  : add boot media check
    Add boot media check , if boot from EMMC,no need to enable nand clock.
---

diff --git a/arch/arm/mach-rockchip/rknandbase.c b/arch/arm/mach-rockchip/rknandbase.c
index deefabb67f37..bda37fab9b2f 100755
--- a/arch/arm/mach-rockchip/rknandbase.c
+++ b/arch/arm/mach-rockchip/rknandbase.c
@@ -208,6 +208,14 @@ int rknand_nandc_irq_init(int id,int mode,void * pfun)
 }
 EXPORT_SYMBOL(rknand_nandc_irq_init);
 
+/*1:flash 2:emmc 4:sdcard0 8:sdcard1*/
+static int rknand_boot_media = 2;
+int rknand_get_boot_media(void)
+{
+	return rknand_boot_media;
+}
+EXPORT_SYMBOL(rknand_get_boot_media);
+
 static int rknand_probe(struct platform_device *pdev)
 {
 	unsigned int id = 0;
@@ -241,7 +249,12 @@ static int rknand_probe(struct platform_device *pdev)
     if(id == 0)
 	{
         memcpy(nand_idb_data,membase+0x1000,0x800);
-	}
+		if (*(int *)(&nand_idb_data[0]) == 0x44535953) {
+			rknand_boot_media = *(int *)(&nand_idb_data[8]);
+			if (rknand_boot_media == 2) /*boot from emmc*/
+				return -1;
+		}
+	}
 	else if(id >= 2)
 	{
 		dev_err(&pdev->dev, "nandc id = %d error!\n",id);