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authorAlex Deucher <alexander.deucher@amd.com>2015-11-12 04:18:52 +0300
committerAlex Deucher <alexander.deucher@amd.com>2015-12-22 00:42:30 +0300
commit16881da6c0b9db5fca95b96b0f02720e94c92629 (patch)
treee8d219593c42cbad730938bd66f4151c4aa1e695 /drivers/gpu/drm/amd/include/amd_pcie_helpers.h
parent74c577b0313d4140ec8b61745c6ade3a4d735d33 (diff)
downloadlinux-16881da6c0b9db5fca95b96b0f02720e94c92629.tar.xz
drm/amdgpu: extract pcie helpers to common header
These will be used by multiple powerplay drivers and other IP modules. Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/include/amd_pcie_helpers.h')
-rw-r--r--drivers/gpu/drm/amd/include/amd_pcie_helpers.h141
1 files changed, 141 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/include/amd_pcie_helpers.h b/drivers/gpu/drm/amd/include/amd_pcie_helpers.h
new file mode 100644
index 000000000000..2cfdf054953b
--- /dev/null
+++ b/drivers/gpu/drm/amd/include/amd_pcie_helpers.h
@@ -0,0 +1,141 @@
+/*
+ * Copyright 2015 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __AMD_PCIE_HELPERS_H__
+#define __AMD_PCIE_HELPERS_H__
+
+#include "amd_pcie.h"
+
+static inline bool is_pcie_gen3_supported(uint32_t pcie_link_speed_cap)
+{
+ if (pcie_link_speed_cap & CAIL_PCIE_LINK_SPEED_SUPPORT_GEN3)
+ return 1;
+
+ return 0;
+}
+
+static inline bool is_pcie_gen2_supported(uint32_t pcie_link_speed_cap)
+{
+ if (pcie_link_speed_cap & CAIL_PCIE_LINK_SPEED_SUPPORT_GEN2)
+ return 1;
+
+ return 0;
+}
+
+/* Get the new PCIE speed given the ASIC PCIE Cap and the NewState's requested PCIE speed*/
+static inline uint16_t get_pcie_gen_support(uint32_t pcie_link_speed_cap,
+ uint16_t ns_pcie_gen)
+{
+ uint32_t asic_pcie_link_speed_cap = (pcie_link_speed_cap &
+ CAIL_ASIC_PCIE_LINK_SPEED_SUPPORT_MASK);
+ uint32_t sys_pcie_link_speed_cap = (pcie_link_speed_cap &
+ CAIL_PCIE_LINK_SPEED_SUPPORT_MASK);
+
+ switch (asic_pcie_link_speed_cap) {
+ case CAIL_ASIC_PCIE_LINK_SPEED_SUPPORT_GEN1:
+ return PP_PCIEGen1;
+
+ case CAIL_ASIC_PCIE_LINK_SPEED_SUPPORT_GEN2:
+ return PP_PCIEGen2;
+
+ case CAIL_ASIC_PCIE_LINK_SPEED_SUPPORT_GEN3:
+ return PP_PCIEGen3;
+
+ default:
+ if (is_pcie_gen3_supported(sys_pcie_link_speed_cap) &&
+ (ns_pcie_gen == PP_PCIEGen3)) {
+ return PP_PCIEGen3;
+ } else if (is_pcie_gen2_supported(sys_pcie_link_speed_cap) &&
+ ((ns_pcie_gen == PP_PCIEGen3) || (ns_pcie_gen == PP_PCIEGen2))) {
+ return PP_PCIEGen2;
+ }
+ }
+
+ return PP_PCIEGen1;
+}
+
+static inline uint16_t get_pcie_lane_support(uint32_t pcie_lane_width_cap,
+ uint16_t ns_pcie_lanes)
+{
+ int i, j;
+ uint16_t new_pcie_lanes = ns_pcie_lanes;
+ uint16_t pcie_lanes[7] = {1, 2, 4, 8, 12, 16, 32};
+
+ switch (pcie_lane_width_cap) {
+ case 0:
+ printk(KERN_ERR "No valid PCIE lane width reported");
+ break;
+ case CAIL_PCIE_LINK_WIDTH_SUPPORT_X1:
+ new_pcie_lanes = 1;
+ break;
+ case CAIL_PCIE_LINK_WIDTH_SUPPORT_X2:
+ new_pcie_lanes = 2;
+ break;
+ case CAIL_PCIE_LINK_WIDTH_SUPPORT_X4:
+ new_pcie_lanes = 4;
+ break;
+ case CAIL_PCIE_LINK_WIDTH_SUPPORT_X8:
+ new_pcie_lanes = 8;
+ break;
+ case CAIL_PCIE_LINK_WIDTH_SUPPORT_X12:
+ new_pcie_lanes = 12;
+ break;
+ case CAIL_PCIE_LINK_WIDTH_SUPPORT_X16:
+ new_pcie_lanes = 16;
+ break;
+ case CAIL_PCIE_LINK_WIDTH_SUPPORT_X32:
+ new_pcie_lanes = 32;
+ break;
+ default:
+ for (i = 0; i < 7; i++) {
+ if (ns_pcie_lanes == pcie_lanes[i]) {
+ if (pcie_lane_width_cap & (0x10000 << i)) {
+ break;
+ } else {
+ for (j = i - 1; j >= 0; j--) {
+ if (pcie_lane_width_cap & (0x10000 << j)) {
+ new_pcie_lanes = pcie_lanes[j];
+ break;
+ }
+ }
+
+ if (j < 0) {
+ for (j = i + 1; j < 7; j++) {
+ if (pcie_lane_width_cap & (0x10000 << j)) {
+ new_pcie_lanes = pcie_lanes[j];
+ break;
+ }
+ }
+ if (j > 7)
+ printk(KERN_ERR "Cannot find a valid PCIE lane width!");
+ }
+ }
+ break;
+ }
+ }
+ break;
+ }
+
+ return new_pcie_lanes;
+}
+
+#endif