/*
 * Copyright 2021 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.
 *
 */
#include "amdgpu.h"
#include "hdp_v5_2.h"

#include "hdp/hdp_5_2_1_offset.h"
#include "hdp/hdp_5_2_1_sh_mask.h"
#include <uapi/linux/kfd_ioctl.h>

static void hdp_v5_2_flush_hdp(struct amdgpu_device *adev,
                                struct amdgpu_ring *ring)
{
        if (!ring || !ring->funcs->emit_wreg) {
                WREG32_NO_KIQ((adev->rmmio_remap.reg_offset + KFD_MMIO_REMAP_HDP_MEM_FLUSH_CNTL) >> 2,
                        0);
                if (amdgpu_sriov_vf(adev)) {
                        /* this is fine because SR_IOV doesn't remap the register */
                        RREG32_NO_KIQ((adev->rmmio_remap.reg_offset + KFD_MMIO_REMAP_HDP_MEM_FLUSH_CNTL) >> 2);
                } else {
                        /* We just need to read back a register to post the write.
                         * Reading back the remapped register causes problems on
                         * some platforms so just read back the memory size register.
                         */
                        if (adev->nbio.funcs->get_memsize)
                                adev->nbio.funcs->get_memsize(adev);
                }
        } else {
                amdgpu_ring_emit_wreg(ring,
                        (adev->rmmio_remap.reg_offset + KFD_MMIO_REMAP_HDP_MEM_FLUSH_CNTL) >> 2,
                        0);
        }
}

static void hdp_v5_2_update_mem_power_gating(struct amdgpu_device *adev,
                                             bool enable)
{
        uint32_t hdp_clk_cntl;
        uint32_t hdp_mem_pwr_cntl;

        if (!(adev->cg_flags & (AMD_CG_SUPPORT_HDP_LS |
                                AMD_CG_SUPPORT_HDP_DS |
                                AMD_CG_SUPPORT_HDP_SD)))
                return;

        hdp_clk_cntl = RREG32_SOC15(HDP, 0, regHDP_CLK_CNTL);
        hdp_mem_pwr_cntl = RREG32_SOC15(HDP, 0, regHDP_MEM_POWER_CTRL);

        /* Before doing clock/power mode switch, forced on MEM clock */
        hdp_clk_cntl = REG_SET_FIELD(hdp_clk_cntl, HDP_CLK_CNTL,
                                     ATOMIC_MEM_CLK_SOFT_OVERRIDE, 1);
        hdp_clk_cntl = REG_SET_FIELD(hdp_clk_cntl, HDP_CLK_CNTL,
                                     RC_MEM_CLK_SOFT_OVERRIDE, 1);
        WREG32_SOC15(HDP, 0, regHDP_CLK_CNTL, hdp_clk_cntl);

        /* disable clock and power gating before any changing */
        hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl, HDP_MEM_POWER_CTRL,
                                         ATOMIC_MEM_POWER_CTRL_EN, 0);
        hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl, HDP_MEM_POWER_CTRL,
                                         ATOMIC_MEM_POWER_LS_EN, 0);
        hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl, HDP_MEM_POWER_CTRL,
                                         ATOMIC_MEM_POWER_DS_EN, 0);
        hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl, HDP_MEM_POWER_CTRL,
                                         ATOMIC_MEM_POWER_SD_EN, 0);
        hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl, HDP_MEM_POWER_CTRL,
                                         RC_MEM_POWER_CTRL_EN, 0);
        hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl, HDP_MEM_POWER_CTRL,
                                         RC_MEM_POWER_LS_EN, 0);
        hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl, HDP_MEM_POWER_CTRL,
                                         RC_MEM_POWER_DS_EN, 0);
        hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl, HDP_MEM_POWER_CTRL,
                                         RC_MEM_POWER_SD_EN, 0);
        WREG32_SOC15(HDP, 0, regHDP_MEM_POWER_CTRL, hdp_mem_pwr_cntl);

        /* Already disabled above. The actions below are for "enabled" only */
        if (enable) {
                /* only one clock gating mode (LS/DS/SD) can be enabled */
                if (adev->cg_flags & AMD_CG_SUPPORT_HDP_SD) {
                        hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl,
                                                         HDP_MEM_POWER_CTRL,
                                                         ATOMIC_MEM_POWER_SD_EN, 1);
                        hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl,
                                                         HDP_MEM_POWER_CTRL,
                                                         RC_MEM_POWER_SD_EN, 1);
                } else if (adev->cg_flags & AMD_CG_SUPPORT_HDP_LS) {
                        hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl,
                                                         HDP_MEM_POWER_CTRL,
                                                         ATOMIC_MEM_POWER_LS_EN, 1);
                        hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl,
                                                         HDP_MEM_POWER_CTRL,
                                                         RC_MEM_POWER_LS_EN, 1);
                } else if (adev->cg_flags & AMD_CG_SUPPORT_HDP_DS) {
                        hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl,
                                                         HDP_MEM_POWER_CTRL,
                                                         ATOMIC_MEM_POWER_DS_EN, 1);
                        hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl,
                                                         HDP_MEM_POWER_CTRL,
                                                         RC_MEM_POWER_DS_EN, 1);
                }

                /* confirmed that ATOMIC/RC_MEM_POWER_CTRL_EN have to be set for SRAM LS/DS/SD */
                if (adev->cg_flags & (AMD_CG_SUPPORT_HDP_LS | AMD_CG_SUPPORT_HDP_DS |
                                      AMD_CG_SUPPORT_HDP_SD)) {
                        hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl, HDP_MEM_POWER_CTRL,
                                                         ATOMIC_MEM_POWER_CTRL_EN, 1);
                        hdp_mem_pwr_cntl = REG_SET_FIELD(hdp_mem_pwr_cntl, HDP_MEM_POWER_CTRL,
                                                         RC_MEM_POWER_CTRL_EN, 1);
                        WREG32_SOC15(HDP, 0, regHDP_MEM_POWER_CTRL, hdp_mem_pwr_cntl);
                }
        }

        /* disable MEM clock override after clock/power mode changing */
        hdp_clk_cntl = REG_SET_FIELD(hdp_clk_cntl, HDP_CLK_CNTL,
                                     ATOMIC_MEM_CLK_SOFT_OVERRIDE, 0);
        hdp_clk_cntl = REG_SET_FIELD(hdp_clk_cntl, HDP_CLK_CNTL,
                                     RC_MEM_CLK_SOFT_OVERRIDE, 0);
        WREG32_SOC15(HDP, 0, regHDP_CLK_CNTL, hdp_clk_cntl);
}

static void hdp_v5_2_update_medium_grain_clock_gating(struct amdgpu_device *adev,
                                                      bool enable)
{
        uint32_t hdp_clk_cntl;

        if (!(adev->cg_flags & AMD_CG_SUPPORT_HDP_MGCG))
                return;

        hdp_clk_cntl = RREG32_SOC15(HDP, 0, regHDP_CLK_CNTL);

        if (enable) {
                hdp_clk_cntl &=
                        ~(uint32_t)
                        (HDP_CLK_CNTL__ATOMIC_MEM_CLK_SOFT_OVERRIDE_MASK |
                         HDP_CLK_CNTL__RC_MEM_CLK_SOFT_OVERRIDE_MASK |
                         HDP_CLK_CNTL__DBUS_CLK_SOFT_OVERRIDE_MASK |
                         HDP_CLK_CNTL__DYN_CLK_SOFT_OVERRIDE_MASK |
                         HDP_CLK_CNTL__XDP_REG_CLK_SOFT_OVERRIDE_MASK |
                         HDP_CLK_CNTL__HDP_REG_CLK_SOFT_OVERRIDE_MASK);
        } else {
                hdp_clk_cntl |= HDP_CLK_CNTL__ATOMIC_MEM_CLK_SOFT_OVERRIDE_MASK |
                        HDP_CLK_CNTL__RC_MEM_CLK_SOFT_OVERRIDE_MASK |
                        HDP_CLK_CNTL__DBUS_CLK_SOFT_OVERRIDE_MASK |
                        HDP_CLK_CNTL__DYN_CLK_SOFT_OVERRIDE_MASK |
                        HDP_CLK_CNTL__XDP_REG_CLK_SOFT_OVERRIDE_MASK |
                        HDP_CLK_CNTL__HDP_REG_CLK_SOFT_OVERRIDE_MASK;
        }

        WREG32_SOC15(HDP, 0, regHDP_CLK_CNTL, hdp_clk_cntl);
}

static void hdp_v5_2_get_clockgating_state(struct amdgpu_device *adev,
                                           u64 *flags)
{
        uint32_t tmp;

        /* AMD_CG_SUPPORT_HDP_MGCG */
        tmp = RREG32_SOC15(HDP, 0, regHDP_CLK_CNTL);
        if (!(tmp & (HDP_CLK_CNTL__ATOMIC_MEM_CLK_SOFT_OVERRIDE_MASK |
                     HDP_CLK_CNTL__RC_MEM_CLK_SOFT_OVERRIDE_MASK |
                     HDP_CLK_CNTL__DBUS_CLK_SOFT_OVERRIDE_MASK |
                     HDP_CLK_CNTL__DYN_CLK_SOFT_OVERRIDE_MASK |
                     HDP_CLK_CNTL__XDP_REG_CLK_SOFT_OVERRIDE_MASK |
                     HDP_CLK_CNTL__HDP_REG_CLK_SOFT_OVERRIDE_MASK)))
                *flags |= AMD_CG_SUPPORT_HDP_MGCG;

        /* AMD_CG_SUPPORT_HDP_LS/DS/SD */
        tmp = RREG32_SOC15(HDP, 0, regHDP_MEM_POWER_CTRL);
        if (tmp & HDP_MEM_POWER_CTRL__ATOMIC_MEM_POWER_LS_EN_MASK)
                *flags |= AMD_CG_SUPPORT_HDP_LS;
        else if (tmp & HDP_MEM_POWER_CTRL__ATOMIC_MEM_POWER_DS_EN_MASK)
                *flags |= AMD_CG_SUPPORT_HDP_DS;
        else if (tmp & HDP_MEM_POWER_CTRL__ATOMIC_MEM_POWER_SD_EN_MASK)
                *flags |= AMD_CG_SUPPORT_HDP_SD;
}

static void hdp_v5_2_update_clock_gating(struct amdgpu_device *adev,
                                              bool enable)
{
        hdp_v5_2_update_mem_power_gating(adev, enable);
        hdp_v5_2_update_medium_grain_clock_gating(adev, enable);
}

const struct amdgpu_hdp_funcs hdp_v5_2_funcs = {
        .flush_hdp = hdp_v5_2_flush_hdp,
        .update_clock_gating = hdp_v5_2_update_clock_gating,
        .get_clock_gating_state = hdp_v5_2_get_clockgating_state,
};