[PATCH v2 1/2] rockchip: sdram: Add rockchip_sdram_type() helper

[Jonas Karlman]

Add a helper function based on rockchip_sdram_size() that return what
DRAM type is used on current running board.

Signed-off-by: Jonas Karlman <jonas at kwiboo.se>
---
v2: New patch
---
 arch/arm/include/asm/arch-rockchip/sdram.h |  3 +++
 arch/arm/mach-rockchip/sdram.c             | 15 +++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/arch/arm/include/asm/arch-rockchip/sdram.h b/arch/arm/include/asm/arch-rockchip/sdram.h
index 4fb45ac5c76e..476fc1c4ee33 100644
--- a/arch/arm/include/asm/arch-rockchip/sdram.h
+++ b/arch/arm/include/asm/arch-rockchip/sdram.h
@@ -87,6 +87,9 @@ enum {
 #define SYS_REG_CS1_COL_SHIFT(ch)		(0 + (ch) * 2)
 #define SYS_REG_CS1_COL_MASK			3
 
+/* Get sdram type decode from reg */
+u8 rockchip_sdram_type(phys_addr_t reg);
+
 /* Get sdram size decode from reg */
 size_t rockchip_sdram_size(phys_addr_t reg);
 
diff --git a/arch/arm/mach-rockchip/sdram.c b/arch/arm/mach-rockchip/sdram.c
index 3bc482331c7e..d560f90e873d 100644
--- a/arch/arm/mach-rockchip/sdram.c
+++ b/arch/arm/mach-rockchip/sdram.c
@@ -345,6 +345,21 @@ int dram_init_banksize(void)
 	return 0;
 }
 
+u8 rockchip_sdram_type(phys_addr_t reg)
+{
+	u32 dram_type, version;
+	u32 sys_reg2 = readl(reg);
+	u32 sys_reg3 = readl(reg + 4);
+
+	dram_type = (sys_reg2 >> SYS_REG_DDRTYPE_SHIFT) & SYS_REG_DDRTYPE_MASK;
+	version = (sys_reg3 >> SYS_REG_VERSION_SHIFT) & SYS_REG_VERSION_MASK;
+	if (version >= 3)
+		dram_type |= ((sys_reg3 >> SYS_REG_EXTEND_DDRTYPE_SHIFT) &
+			      SYS_REG_EXTEND_DDRTYPE_MASK) << 3;
+
+	return dram_type;
+}
+
 size_t rockchip_sdram_size(phys_addr_t reg)
 {
 	u32 rank, cs0_col, bk, cs0_row, cs1_row, bw, row_3_4;
-- 
2.50.1