/*
 * Copyright 2011 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.
 *
 * Authors: Alex Deucher
 */

#include <drm/drmP.h>
#include "radeon.h"
#include "rv740d.h"
#include "r600_dpm.h"
#include "rv770_dpm.h"
#include "atom.h"

struct rv7xx_power_info *rv770_get_pi(struct radeon_device *rdev);

u32 rv740_get_decoded_reference_divider(u32 encoded_ref)
{
	u32 ref = 0;

	switch (encoded_ref) {
	case 0:
		ref = 1;
		break;
	case 16:
		ref = 2;
		break;
	case 17:
		ref = 3;
		break;
	case 18:
		ref = 2;
		break;
	case 19:
		ref = 3;
		break;
	case 20:
		ref = 4;
		break;
	case 21:
		ref = 5;
		break;
	default:
		DRM_ERROR("Invalid encoded Reference Divider\n");
		ref = 0;
		break;
	}

	return ref;
}

struct dll_speed_setting {
	u16 min;
	u16 max;
	u32 dll_speed;
};

static struct dll_speed_setting dll_speed_table[16] =
{
	{ 270, 320, 0x0f },
	{ 240, 270, 0x0e },
	{ 200, 240, 0x0d },
	{ 180, 200, 0x0c },
	{ 160, 180, 0x0b },
	{ 140, 160, 0x0a },
	{ 120, 140, 0x09 },
	{ 110, 120, 0x08 },
	{  95, 110, 0x07 },
	{  85,  95, 0x06 },
	{  78,  85, 0x05 },
	{  70,  78, 0x04 },
	{  65,  70, 0x03 },
	{  60,  65, 0x02 },
	{  42,  60, 0x01 },
	{  00,  42, 0x00 }
};

u32 rv740_get_dll_speed(bool is_gddr5, u32 memory_clock)
{
	int i;
	u32 factor;
	u16 data_rate;

	if (is_gddr5)
		factor = 4;
	else
		factor = 2;

	data_rate = (u16)(memory_clock * factor / 1000);

	if (data_rate < dll_speed_table[0].max) {
		for (i = 0; i < 16; i++) {
			if (data_rate > dll_speed_table[i].min &&
			    data_rate <= dll_speed_table[i].max)
				return dll_speed_table[i].dll_speed;
		}
	}

	DRM_DEBUG_KMS("Target MCLK greater than largest MCLK in DLL speed table\n");

	return 0x0f;
}

int rv740_populate_sclk_value(struct radeon_device *rdev, u32 engine_clock,
			      RV770_SMC_SCLK_VALUE *sclk)
{
	struct rv7xx_power_info *pi = rv770_get_pi(rdev);
	struct atom_clock_dividers dividers;
	u32 spll_func_cntl = pi->clk_regs.rv770.cg_spll_func_cntl;
	u32 spll_func_cntl_2 = pi->clk_regs.rv770.cg_spll_func_cntl_2;
	u32 spll_func_cntl_3 = pi->clk_regs.rv770.cg_spll_func_cntl_3;
	u32 cg_spll_spread_spectrum = pi->clk_regs.rv770.cg_spll_spread_spectrum;
	u32 cg_spll_spread_spectrum_2 = pi->clk_regs.rv770.cg_spll_spread_spectrum_2;
	u64 tmp;
	u32 reference_clock = rdev->clock.spll.reference_freq;
	u32 reference_divider;
	u32 fbdiv;
	int ret;

	ret = radeon_atom_get_clock_dividers(rdev, COMPUTE_ENGINE_PLL_PARAM,
					     engine_clock, false, &dividers);
	if (ret)
		return ret;

	reference_divider = 1 + dividers.ref_div;

	tmp = (u64) engine_clock * reference_divider * dividers.post_div * 16384;
	do_div(tmp, reference_clock);
	fbdiv = (u32) tmp;

	spll_func_cntl &= ~(SPLL_PDIV_A_MASK | SPLL_REF_DIV_MASK);
	spll_func_cntl |= SPLL_REF_DIV(dividers.ref_div);
	spll_func_cntl |= SPLL_PDIV_A(dividers.post_div);

	spll_func_cntl_2 &= ~SCLK_MUX_SEL_MASK;
	spll_func_cntl_2 |= SCLK_MUX_SEL(2);

	spll_func_cntl_3 &= ~SPLL_FB_DIV_MASK;
	spll_func_cntl_3 |= SPLL_FB_DIV(fbdiv);
	spll_func_cntl_3 |= SPLL_DITHEN;

	if (pi->sclk_ss) {
		struct radeon_atom_ss ss;
		u32 vco_freq = engine_clock * dividers.post_div;

		if (radeon_atombios_get_asic_ss_info(rdev, &ss,
						     ASIC_INTERNAL_ENGINE_SS, vco_freq)) {
			u32 clk_s = reference_clock * 5 / (reference_divider * ss.rate);
			u32 clk_v = 4 * ss.percentage * fbdiv / (clk_s * 10000);

			cg_spll_spread_spectrum &= ~CLK_S_MASK;
			cg_spll_spread_spectrum |= CLK_S(clk_s);
			cg_spll_spread_spectrum |= SSEN;

			cg_spll_spread_spectrum_2 &= ~CLK_V_MASK;
			cg_spll_spread_spectrum_2 |= CLK_V(clk_v);
		}
	}

	sclk->sclk_value = cpu_to_be32(engine_clock);
	sclk->vCG_SPLL_FUNC_CNTL = cpu_to_be32(spll_func_cntl);
	sclk->vCG_SPLL_FUNC_CNTL_2 = cpu_to_be32(spll_func_cntl_2);
	sclk->vCG_SPLL_FUNC_CNTL_3 = cpu_to_be32(spll_func_cntl_3);
	sclk->vCG_SPLL_SPREAD_SPECTRUM = cpu_to_be32(cg_spll_spread_spectrum);
	sclk->vCG_SPLL_SPREAD_SPECTRUM_2 = cpu_to_be32(cg_spll_spread_spectrum_2);

	return 0;
}

int rv740_populate_mclk_value(struct radeon_device *rdev,
			      u32 engine_clock, u32 memory_clock,
			      RV7XX_SMC_MCLK_VALUE *mclk)
{
	struct rv7xx_power_info *pi = rv770_get_pi(rdev);
	u32 mpll_ad_func_cntl = pi->clk_regs.rv770.mpll_ad_func_cntl;
	u32 mpll_ad_func_cntl_2 = pi->clk_regs.rv770.mpll_ad_func_cntl_2;
	u32 mpll_dq_func_cntl = pi->clk_regs.rv770.mpll_dq_func_cntl;
	u32 mpll_dq_func_cntl_2 = pi->clk_regs.rv770.mpll_dq_func_cntl_2;
	u32 mclk_pwrmgt_cntl = pi->clk_regs.rv770.mclk_pwrmgt_cntl;
	u32 dll_cntl = pi->clk_regs.rv770.dll_cntl;
	u32 mpll_ss1 = pi->clk_regs.rv770.mpll_ss1;
	u32 mpll_ss2 = pi->clk_regs.rv770.mpll_ss2;
	struct atom_clock_dividers dividers;
	u32 ibias;
	u32 dll_speed;
	int ret;

	ret = radeon_atom_get_clock_dividers(rdev, COMPUTE_MEMORY_PLL_PARAM,
					     memory_clock, false, &dividers);
	if (ret)
		return ret;

	ibias = rv770_map_clkf_to_ibias(rdev, dividers.whole_fb_div);

	mpll_ad_func_cntl &= ~(CLKR_MASK |
			       YCLK_POST_DIV_MASK |
			       CLKF_MASK |
			       CLKFRAC_MASK |
			       IBIAS_MASK);
	mpll_ad_func_cntl |= CLKR(dividers.ref_div);
	mpll_ad_func_cntl |= YCLK_POST_DIV(dividers.post_div);
	mpll_ad_func_cntl |= CLKF(dividers.whole_fb_div);
	mpll_ad_func_cntl |= CLKFRAC(dividers.frac_fb_div);
	mpll_ad_func_cntl |= IBIAS(ibias);

	if (dividers.vco_mode)
		mpll_ad_func_cntl_2 |= VCO_MODE;
	else
		mpll_ad_func_cntl_2 &= ~VCO_MODE;

	if (pi->mem_gddr5) {
		mpll_dq_func_cntl &= ~(CLKR_MASK |
				       YCLK_POST_DIV_MASK |
				       CLKF_MASK |
				       CLKFRAC_MASK |
				       IBIAS_MASK);
		mpll_dq_func_cntl |= CLKR(dividers.ref_div);
		mpll_dq_func_cntl |= YCLK_POST_DIV(dividers.post_div);
		mpll_dq_func_cntl |= CLKF(dividers.whole_fb_div);
		mpll_dq_func_cntl |= CLKFRAC(dividers.frac_fb_div);
		mpll_dq_func_cntl |= IBIAS(ibias);

		if (dividers.vco_mode)
			mpll_dq_func_cntl_2 |= VCO_MODE;
		else
			mpll_dq_func_cntl_2 &= ~VCO_MODE;
	}

	if (pi->mclk_ss) {
		struct radeon_atom_ss ss;
		u32 vco_freq = memory_clock * dividers.post_div;

		if (radeon_atombios_get_asic_ss_info(rdev, &ss,
						     ASIC_INTERNAL_MEMORY_SS, vco_freq)) {
			u32 reference_clock = rdev->clock.mpll.reference_freq;
			u32 decoded_ref = rv740_get_decoded_reference_divider(dividers.ref_div);
			u32 clk_s = reference_clock * 5 / (decoded_ref * ss.rate);
			u32 clk_v = 0x40000 * ss.percentage *
				(dividers.whole_fb_div + (dividers.frac_fb_div / 8)) / (clk_s * 10000);

			mpll_ss1 &= ~CLKV_MASK;
			mpll_ss1 |= CLKV(clk_v);

			mpll_ss2 &= ~CLKS_MASK;
			mpll_ss2 |= CLKS(clk_s);
		}
	}

	dll_speed = rv740_get_dll_speed(pi->mem_gddr5,
					memory_clock);

	mclk_pwrmgt_cntl &= ~DLL_SPEED_MASK;
	mclk_pwrmgt_cntl |= DLL_SPEED(dll_speed);

	mclk->mclk770.mclk_value = cpu_to_be32(memory_clock);
	mclk->mclk770.vMPLL_AD_FUNC_CNTL = cpu_to_be32(mpll_ad_func_cntl);
	mclk->mclk770.vMPLL_AD_FUNC_CNTL_2 = cpu_to_be32(mpll_ad_func_cntl_2);
	mclk->mclk770.vMPLL_DQ_FUNC_CNTL = cpu_to_be32(mpll_dq_func_cntl);
	mclk->mclk770.vMPLL_DQ_FUNC_CNTL_2 = cpu_to_be32(mpll_dq_func_cntl_2);
	mclk->mclk770.vMCLK_PWRMGT_CNTL = cpu_to_be32(mclk_pwrmgt_cntl);
	mclk->mclk770.vDLL_CNTL = cpu_to_be32(dll_cntl);
	mclk->mclk770.vMPLL_SS = cpu_to_be32(mpll_ss1);
	mclk->mclk770.vMPLL_SS2 = cpu_to_be32(mpll_ss2);

	return 0;
}

void rv740_read_clock_registers(struct radeon_device *rdev)
{
	struct rv7xx_power_info *pi = rv770_get_pi(rdev);

	pi->clk_regs.rv770.cg_spll_func_cntl =
		RREG32(CG_SPLL_FUNC_CNTL);
	pi->clk_regs.rv770.cg_spll_func_cntl_2 =
		RREG32(CG_SPLL_FUNC_CNTL_2);
	pi->clk_regs.rv770.cg_spll_func_cntl_3 =
		RREG32(CG_SPLL_FUNC_CNTL_3);
	pi->clk_regs.rv770.cg_spll_spread_spectrum =
		RREG32(CG_SPLL_SPREAD_SPECTRUM);
	pi->clk_regs.rv770.cg_spll_spread_spectrum_2 =
		RREG32(CG_SPLL_SPREAD_SPECTRUM_2);

	pi->clk_regs.rv770.mpll_ad_func_cntl =
		RREG32(MPLL_AD_FUNC_CNTL);
	pi->clk_regs.rv770.mpll_ad_func_cntl_2 =
		RREG32(MPLL_AD_FUNC_CNTL_2);
	pi->clk_regs.rv770.mpll_dq_func_cntl =
		RREG32(MPLL_DQ_FUNC_CNTL);
	pi->clk_regs.rv770.mpll_dq_func_cntl_2 =
		RREG32(MPLL_DQ_FUNC_CNTL_2);
	pi->clk_regs.rv770.mclk_pwrmgt_cntl =
		RREG32(MCLK_PWRMGT_CNTL);
	pi->clk_regs.rv770.dll_cntl = RREG32(DLL_CNTL);
	pi->clk_regs.rv770.mpll_ss1 = RREG32(MPLL_SS1);
	pi->clk_regs.rv770.mpll_ss2 = RREG32(MPLL_SS2);
}

int rv740_populate_smc_acpi_state(struct radeon_device *rdev,
				  RV770_SMC_STATETABLE *table)
{
	struct rv7xx_power_info *pi = rv770_get_pi(rdev);
	u32 mpll_ad_func_cntl = pi->clk_regs.rv770.mpll_ad_func_cntl;
	u32 mpll_ad_func_cntl_2 = pi->clk_regs.rv770.mpll_ad_func_cntl_2;
	u32 mpll_dq_func_cntl = pi->clk_regs.rv770.mpll_dq_func_cntl;
	u32 mpll_dq_func_cntl_2 = pi->clk_regs.rv770.mpll_dq_func_cntl_2;
	u32 spll_func_cntl = pi->clk_regs.rv770.cg_spll_func_cntl;
	u32 spll_func_cntl_2 = pi->clk_regs.rv770.cg_spll_func_cntl_2;
	u32 spll_func_cntl_3 = pi->clk_regs.rv770.cg_spll_func_cntl_3;
	u32 mclk_pwrmgt_cntl = pi->clk_regs.rv770.mclk_pwrmgt_cntl;
	u32 dll_cntl = pi->clk_regs.rv770.dll_cntl;

	table->ACPIState = table->initialState;

	table->ACPIState.flags &= ~PPSMC_SWSTATE_FLAG_DC;

	if (pi->acpi_vddc) {
		rv770_populate_vddc_value(rdev, pi->acpi_vddc,
					  &table->ACPIState.levels[0].vddc);
		table->ACPIState.levels[0].gen2PCIE =
			pi->pcie_gen2 ?
			pi->acpi_pcie_gen2 : 0;
		table->ACPIState.levels[0].gen2XSP =
			pi->acpi_pcie_gen2;
	} else {
		rv770_populate_vddc_value(rdev, pi->min_vddc_in_table,
					  &table->ACPIState.levels[0].vddc);
		table->ACPIState.levels[0].gen2PCIE = 0;
	}

	mpll_ad_func_cntl_2 |= BIAS_GEN_PDNB | RESET_EN;

	mpll_dq_func_cntl_2 |= BYPASS | BIAS_GEN_PDNB | RESET_EN;

	mclk_pwrmgt_cntl |= (MRDCKA0_RESET |
			     MRDCKA1_RESET |
			     MRDCKB0_RESET |
			     MRDCKB1_RESET |
			     MRDCKC0_RESET |
			     MRDCKC1_RESET |
			     MRDCKD0_RESET |
			     MRDCKD1_RESET);

	dll_cntl |= (MRDCKA0_BYPASS |
		     MRDCKA1_BYPASS |
		     MRDCKB0_BYPASS |
		     MRDCKB1_BYPASS |
		     MRDCKC0_BYPASS |
		     MRDCKC1_BYPASS |
		     MRDCKD0_BYPASS |
		     MRDCKD1_BYPASS);

	spll_func_cntl |= SPLL_RESET | SPLL_SLEEP | SPLL_BYPASS_EN;

	spll_func_cntl_2 &= ~SCLK_MUX_SEL_MASK;
	spll_func_cntl_2 |= SCLK_MUX_SEL(4);

	table->ACPIState.levels[0].mclk.mclk770.vMPLL_AD_FUNC_CNTL = cpu_to_be32(mpll_ad_func_cntl);
	table->ACPIState.levels[0].mclk.mclk770.vMPLL_AD_FUNC_CNTL_2 = cpu_to_be32(mpll_ad_func_cntl_2);
	table->ACPIState.levels[0].mclk.mclk770.vMPLL_DQ_FUNC_CNTL = cpu_to_be32(mpll_dq_func_cntl);
	table->ACPIState.levels[0].mclk.mclk770.vMPLL_DQ_FUNC_CNTL_2 = cpu_to_be32(mpll_dq_func_cntl_2);
	table->ACPIState.levels[0].mclk.mclk770.vMCLK_PWRMGT_CNTL = cpu_to_be32(mclk_pwrmgt_cntl);
	table->ACPIState.levels[0].mclk.mclk770.vDLL_CNTL = cpu_to_be32(dll_cntl);

	table->ACPIState.levels[0].mclk.mclk770.mclk_value = 0;

	table->ACPIState.levels[0].sclk.vCG_SPLL_FUNC_CNTL = cpu_to_be32(spll_func_cntl);
	table->ACPIState.levels[0].sclk.vCG_SPLL_FUNC_CNTL_2 = cpu_to_be32(spll_func_cntl_2);
	table->ACPIState.levels[0].sclk.vCG_SPLL_FUNC_CNTL_3 = cpu_to_be32(spll_func_cntl_3);

	table->ACPIState.levels[0].sclk.sclk_value = 0;

	table->ACPIState.levels[1] = table->ACPIState.levels[0];
	table->ACPIState.levels[2] = table->ACPIState.levels[0];

	rv770_populate_mvdd_value(rdev, 0, &table->ACPIState.levels[0].mvdd);

	return 0;
}

void rv740_enable_mclk_spread_spectrum(struct radeon_device *rdev,
				       bool enable)
{
	if (enable)
		WREG32_P(MPLL_CNTL_MODE, SS_SSEN, ~SS_SSEN);
	else
		WREG32_P(MPLL_CNTL_MODE, 0, ~SS_SSEN);
}

u8 rv740_get_mclk_frequency_ratio(u32 memory_clock)
{
	u8 mc_para_index;

	if ((memory_clock < 10000) || (memory_clock > 47500))
		mc_para_index = 0x00;
	else
		mc_para_index = (u8)((memory_clock - 10000) / 2500);

	return mc_para_index;
}