[PATCH v2 1/2] rockchip: Add SoC detection helper

[Jagan Teki <jagan@amarulasolutions.com>]

Rockchip SoC's has a new revision chip for rk3288, rk3308
based SoCs.

RK3288 has a new revision chip called RK3288W which is relevantly
similar but different hclk_vio clock and working ohci host.

Add common rockchip SoC detection helper to support this rk3288w
detection.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
Changes for v2:
- new patch

 arch/arm/include/asm/arch-rockchip/cpu.h | 49 ++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 arch/arm/include/asm/arch-rockchip/cpu.h

diff --git a/arch/arm/include/asm/arch-rockchip/cpu.h b/arch/arm/include/asm/arch-rockchip/cpu.h
new file mode 100644
index 0000000000..d0d22e4967
--- /dev/null
+++ b/arch/arm/include/asm/arch-rockchip/cpu.h
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: GPL-2.0+  */
+/*
+ * Rockchip Electronics Co., Ltd.
+ */
+
+#ifndef __ASM_ARCH_CPU_H
+#define __ASM_ARCH_CPU_H
+
+#include <asm/io.h>
+
+#define ROCKCHIP_CPU_MASK       0xffff0000
+#define ROCKCHIP_CPU_RK3288     0x32880000
+
+#define ROCKCHIP_SOC_MASK	(ROCKCHIP_CPU_MASK | 0xff)
+#define ROCKCHIP_SOC_RK3288     (ROCKCHIP_CPU_RK3288 | 0x00)
+#define ROCKCHIP_SOC_RK3288W    (ROCKCHIP_CPU_RK3288 | 0x01)
+
+#define RK3288_HDMI_PHYS	0xff980000
+#define HDMI_CONFIG0_ID		0x4
+#define RK3288W_HDMI_REVID	0x1a
+
+static inline int rockchip_soc_id(void)
+{
+	u8 reg;
+
+#if defined(CONFIG_ROCKCHIP_RK3288)
+	reg = readb(RK3288_HDMI_PHYS + HDMI_CONFIG0_ID);
+	if (reg == RK3288W_HDMI_REVID)
+		return ROCKCHIP_SOC_RK3288W;
+	else
+		return ROCKCHIP_SOC_RK3288;
+#else
+	return 0;
+#endif
+}
+
+#define ROCKCHIP_SOC(id, ID) \
+static inline bool soc_is_##id(void) \
+{ \
+	int soc_id = rockchip_soc_id(); \
+	if (soc_id) \
+		return ((soc_id & ROCKCHIP_SOC_MASK) == ROCKCHIP_SOC_ ##ID); \
+	return false; \
+}
+
+ROCKCHIP_SOC(rk3288, RK3288)
+ROCKCHIP_SOC(rk3288w, RK3288W)
+
+#endif
-- 
2.25.1