[U-Boot] [PATCH 1/4] mx6: add function to determine boot device

[Edward Lin]

During boot the boot pin configuration is copied to the SBMR registers.
This patch adds a function to read the boot device from SBMR.

Signed-off-by: Edward Lin <edward.lin at technexion.com>
Signed-off-by: Richard Hu <richard.hu at technexion.com>

---
 arch/arm/cpu/armv7/mx6/soc.c              | 43
+++++++++++++++++++++++++++++++
 arch/arm/include/asm/arch-mx6/sys_proto.h | 17 ++++++++++++
 2 files changed, 60 insertions(+)

diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c
index a390296..6bacdab 100644
--- a/arch/arm/cpu/armv7/mx6/soc.c
+++ b/arch/arm/cpu/armv7/mx6/soc.c
@@ -243,6 +243,49 @@ void s_init(void)
        writel(mask528, &anatop->pfd_528_clr);
 }
 
+enum mx6_boot_device imx_get_boot_device(void)
+{
+       uint soc_sbmr = readl(SRC_BASE_ADDR + 0x4);
+       uint bt_mem_ctl = (soc_sbmr & 0x000000FF) >> 4 ;
+       uint bt_mem_type = (soc_sbmr & 0x00000008) >> 3;
+       uint bt_mem_mmc = (soc_sbmr & 0x00001000) >> 12;
+
+       switch (bt_mem_ctl) {
+       case 0x0:
+               if (bt_mem_type)
+                       return MX6_ONE_NAND_BOOT;
+               else
+                       return MX6_WEIM_NOR_BOOT;
+               break;
+       case 0x2:
+                       return MX6_SATA_BOOT;
+               break;
+       case 0x3:
+               if (bt_mem_type)
+                       return MX6_I2C_BOOT;
+               else
+                       return MX6_SPI_NOR_BOOT;
+               break;
+       case 0x4:
+       case 0x5:
+               if (bt_mem_mmc)
+                       return MX6_SD0_BOOT;
+               else
+                       return MX6_SD1_BOOT;
+               break;
+       case 0x6:
+       case 0x7:
+               return MX6_MMC_BOOT;
+               break;
+       case 0x8 ... 0xf:
+               return MX6_NAND_BOOT;
+               break;
+       default:
+               return MX6_UNKNOWN_BOOT;
+               break;
+       }
+}
+
 #ifdef CONFIG_IMX_HDMI
 void imx_enable_hdmi_phy(void)
 {
diff --git a/arch/arm/include/asm/arch-mx6/sys_proto.h
b/arch/arm/include/asm/arch-mx6/sys_proto.h
index 8c21364..b26955e 100644
--- a/arch/arm/include/asm/arch-mx6/sys_proto.h
+++ b/arch/arm/include/asm/arch-mx6/sys_proto.h
@@ -17,6 +17,21 @@
 #define MXC_CPU_MX6SOLO                0x62
 #define MXC_CPU_MX6Q           0x63
 
+enum mx6_boot_device {
+        MX6_SD0_BOOT,
+        MX6_SD1_BOOT,
+        MX6_MMC_BOOT,
+        MX6_NAND_BOOT,
+        MX6_SATA_BOOT,
+        MX6_WEIM_NOR_BOOT,
+        MX6_ONE_NAND_BOOT,
+        MX6_PATA_BOOT,
+        MX6_I2C_BOOT,
+        MX6_SPI_NOR_BOOT,
+        MX6_UNKNOWN_BOOT,
+        MX6_BOOT_DEV_NUM = MX6_UNKNOWN_BOOT,
+};
+
 #define is_soc_rev(rev)        ((get_cpu_rev() & 0xFF) - rev)
 u32 get_cpu_rev(void);
 
@@ -31,6 +46,8 @@ unsigned imx_ddr_size(void);
 
 void set_vddsoc(u32 mv);
 
+enum mx6_boot_device imx_get_boot_device(void);
+
 /*
  * Initializes on-chip ethernet controllers.
  * to override, implement board_eth_init()
-- 
1.8.0