drm/amd/powerplay: enable backdoor smu fw loading (v2)

enable backdoor smu fw loading on navi10

v2: squash in define fix (Alex)
Signed-off-by: Kenneth Feng <kenneth.feng@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/inc/smu_v11_0.h

@@ -30,6 +30,7 @@
 #define MP0_SRAM			0x03900000
 #define MP1_Public			0x03b00000
 #define MP1_SRAM			0x03c00004
+#define MP1_SMC_SIZE		0x40000
 
 /* address block */
 #define smnMP1_FIRMWARE_FLAGS		0x3010024

drivers/gpu/drm/amd/powerplay/smu_v11_0.c

@@ -207,6 +207,39 @@ static int smu_v11_0_init_microcode(struct smu_context *smu)
 
 static int smu_v11_0_load_microcode(struct smu_context *smu)
 {
+	struct amdgpu_device *adev = smu->adev;
+	const uint32_t *src;
+	const struct smc_firmware_header_v1_0 *hdr;
+	uint32_t addr_start = MP1_SRAM;
+	uint32_t i;
+	uint32_t mp1_fw_flags;
+
+	hdr = (const struct smc_firmware_header_v1_0 *)	adev->pm.fw->data;
+	src = (const uint32_t *)(adev->pm.fw->data +
+		le32_to_cpu(hdr->header.ucode_array_offset_bytes));
+
+	for (i = 1; i < MP1_SMC_SIZE/4 - 1; i++) {
+		WREG32_PCIE(addr_start, src[i]);
+		addr_start += 4;
+	}
+
+	WREG32_PCIE(MP1_Public | (smnMP1_PUB_CTRL & 0xffffffff),
+		1 & MP1_SMN_PUB_CTRL__RESET_MASK);
+	WREG32_PCIE(MP1_Public | (smnMP1_PUB_CTRL & 0xffffffff),
+		1 & ~MP1_SMN_PUB_CTRL__RESET_MASK);
+
+	for (i = 0; i < adev->usec_timeout; i++) {
+		mp1_fw_flags = RREG32_PCIE(MP1_Public |
+			(smnMP1_FIRMWARE_FLAGS & 0xffffffff));
+		if ((mp1_fw_flags & MP1_FIRMWARE_FLAGS__INTERRUPTS_ENABLED_MASK) >>
+			MP1_FIRMWARE_FLAGS__INTERRUPTS_ENABLED__SHIFT)
+			break;
+		udelay(1);
+	}
+
+	if (i == adev->usec_timeout)
+		return -ETIME;
+
 	return 0;
 }