/*
 * 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 "amdgpu_atombios.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,
};
