From 16881da6c0b9db5fca95b96b0f02720e94c92629 Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Wed, 11 Nov 2015 20:18:52 -0500 Subject: drm/amdgpu: extract pcie helpers to common header These will be used by multiple powerplay drivers and other IP modules. Reviewed-by: Jammy Zhou Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/include/amd_pcie_helpers.h | 141 +++++++++++++++++++++++++ 1 file changed, 141 insertions(+) create mode 100644 drivers/gpu/drm/amd/include/amd_pcie_helpers.h (limited to 'drivers/gpu/drm/amd/include/amd_pcie_helpers.h') 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 -- cgit v1.2.3