drm/radeon/kms: add accessors for RCU indirect space

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/evergreen.c

@@ -3120,10 +3120,8 @@ static void evergreen_gpu_init(struct radeon_device *rdev)
 		u32 efuse_straps_4;
 		u32 efuse_straps_3;
 
-		WREG32(RCU_IND_INDEX, 0x204);
-		efuse_straps_4 = RREG32(RCU_IND_DATA);
-		WREG32(RCU_IND_INDEX, 0x203);
-		efuse_straps_3 = RREG32(RCU_IND_DATA);
+		efuse_straps_4 = RREG32_RCU(0x204);
+		efuse_straps_3 = RREG32_RCU(0x203);
 		tmp = (((efuse_straps_4 & 0xf) << 4) |
 		      ((efuse_straps_3 & 0xf0000000) >> 28));
 	} else {

drivers/gpu/drm/radeon/r600_reg.h

@@ -31,6 +31,9 @@
 #define R600_PCIE_PORT_INDEX                0x0038
 #define R600_PCIE_PORT_DATA                 0x003c
 
+#define R600_RCU_INDEX                      0x0100
+#define R600_RCU_DATA                       0x0104
+
 #define R600_MC_VM_FB_LOCATION			0x2180
 #define		R600_MC_FB_BASE_MASK			0x0000FFFF
 #define		R600_MC_FB_BASE_SHIFT			0

drivers/gpu/drm/radeon/radeon.h

@@ -1850,6 +1850,8 @@ void cik_mm_wdoorbell(struct radeon_device *rdev, u32 offset, u32 v);
 #define WREG32_PCIE_PORT(reg, v) rdev->pciep_wreg(rdev, (reg), (v))
 #define RREG32_SMC(reg) tn_smc_rreg(rdev, (reg))
 #define WREG32_SMC(reg, v) tn_smc_wreg(rdev, (reg), (v))
+#define RREG32_RCU(reg) r600_rcu_rreg(rdev, (reg))
+#define WREG32_RCU(reg, v) r600_rcu_wreg(rdev, (reg), (v))
 #define WREG32_P(reg, val, mask)				\
 	do {							\
 		uint32_t tmp_ = RREG32(reg);			\
@@ -1906,6 +1908,21 @@ static inline void tn_smc_wreg(struct radeon_device *rdev, u32 reg, u32 v)
 	WREG32(TN_SMC_IND_DATA_0, (v));
 }
 
+static inline u32 r600_rcu_rreg(struct radeon_device *rdev, u32 reg)
+{
+	u32 r;
+
+	WREG32(R600_RCU_INDEX, ((reg) & 0x1fff));
+	r = RREG32(R600_RCU_DATA);
+	return r;
+}
+
+static inline void r600_rcu_wreg(struct radeon_device *rdev, u32 reg, u32 v)
+{
+	WREG32(R600_RCU_INDEX, ((reg) & 0x1fff));
+	WREG32(R600_RCU_DATA, (v));
+}
+
 void r100_pll_errata_after_index(struct radeon_device *rdev);