drm/amdgpu: implement UMC 64 bits REG operations

implement 64 bits operations via 32 bits interface

v2: make use of lower_32_bits() and upper_32_bits() macros
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Tao Zhou <tao.zhou1@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_umc.h

@@ -21,6 +21,15 @@
 #ifndef __AMDGPU_UMC_H__
 #define __AMDGPU_UMC_H__
 
+/* implement 64 bits REG operations via 32 bits interface */
+#define RREG64_UMC(reg)	(RREG32(reg) | \
+				((uint64_t)RREG32((reg) + 1) << 32))
+#define WREG64_UMC(reg, v)	\
+	do {	\
+		WREG32((reg), lower_32_bits(v));	\
+		WREG32((reg) + 1, upper_32_bits(v));	\
+	} while (0)
+
 /*
  * void (*func)(struct amdgpu_device *adev, struct ras_err_data *err_data,
  *				uint32_t umc_reg_offset, uint32_t channel_index)

drivers/gpu/drm/amd/amdgpu/umc_v6_1.c

@@ -116,7 +116,7 @@ static void umc_v6_1_query_correctable_error_count(struct amdgpu_device *adev,
 
 	/* check for SRAM correctable error
 	  MCUMC_STATUS is a 64 bit register */
-	mc_umc_status = RREG64(mc_umc_status_addr + umc_reg_offset);
+	mc_umc_status = RREG64_UMC(mc_umc_status_addr + umc_reg_offset);
 	if (REG_GET_FIELD(mc_umc_status, MCA_UMC_UMC0_MCUMC_STATUST0, ErrorCodeExt) == 6 &&
 	    REG_GET_FIELD(mc_umc_status, MCA_UMC_UMC0_MCUMC_STATUST0, Val) == 1 &&
 	    REG_GET_FIELD(mc_umc_status, MCA_UMC_UMC0_MCUMC_STATUST0, CECC) == 1)
@@ -134,7 +134,7 @@ static void umc_v6_1_querry_uncorrectable_error_count(struct amdgpu_device *adev
                 SOC15_REG_OFFSET(UMC, 0, mmMCA_UMC_UMC0_MCUMC_STATUST0);
 
 	/* check the MCUMC_STATUS */
-	mc_umc_status = RREG64(mc_umc_status_addr + umc_reg_offset);
+	mc_umc_status = RREG64_UMC(mc_umc_status_addr + umc_reg_offset);
 	if ((REG_GET_FIELD(mc_umc_status, MCA_UMC_UMC0_MCUMC_STATUST0, Val) == 1) &&
 	    (REG_GET_FIELD(mc_umc_status, MCA_UMC_UMC0_MCUMC_STATUST0, Deferred) == 1 ||
 	    REG_GET_FIELD(mc_umc_status, MCA_UMC_UMC0_MCUMC_STATUST0, UECC) == 1 ||
@@ -173,11 +173,11 @@ static void umc_v6_1_query_error_address(struct amdgpu_device *adev,
 	/* skip error address process if -ENOMEM */
 	if (!err_data->err_addr) {
 		/* clear umc status */
-		WREG64(mc_umc_status_addr + umc_reg_offset, 0x0ULL);
+		WREG64_UMC(mc_umc_status_addr + umc_reg_offset, 0x0ULL);
 		return;
 	}
 
-	mc_umc_status = RREG64(mc_umc_status_addr + umc_reg_offset);
+	mc_umc_status = RREG64_UMC(mc_umc_status_addr + umc_reg_offset);
 
 	/* calculate error address if ue/ce error is detected */
 	if (REG_GET_FIELD(mc_umc_status, MCA_UMC_UMC0_MCUMC_STATUST0, Val) == 1 &&
@@ -200,7 +200,7 @@ static void umc_v6_1_query_error_address(struct amdgpu_device *adev,
 	}
 
 	/* clear umc status */
-	WREG64(mc_umc_status_addr + umc_reg_offset, 0x0ULL);
+	WREG64_UMC(mc_umc_status_addr + umc_reg_offset, 0x0ULL);
 }
 
 static void umc_v6_1_query_ras_error_address(struct amdgpu_device *adev,