/*
 * 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.
 *
 * Authors: AMD
 *
 */

#include <linux/string.h>
#include <linux/acpi.h>

#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <drm/amdgpu_drm.h>
#include "dm_services.h"
#include "amdgpu.h"
#include "amdgpu_dm.h"
#include "amdgpu_dm_irq.h"
#include "amdgpu_dm_types.h"
#include "amdgpu_pm.h"

#define dm_alloc(size) kzalloc(size, GFP_KERNEL)
#define dm_realloc(ptr, size) krealloc(ptr, size, GFP_KERNEL)
#define dm_free(ptr) kfree(ptr)

/******************************************************************************
 * IRQ Interfaces.
 *****************************************************************************/

void dal_register_timer_interrupt(
	struct dc_context *ctx,
	struct dc_timer_interrupt_params *int_params,
	interrupt_handler ih,
	void *args)
{
	struct amdgpu_device *adev = ctx->driver_context;

	if (!adev || !int_params) {
		DRM_ERROR("DM_IRQ: invalid input!\n");
		return;
	}

	if (int_params->int_context != INTERRUPT_LOW_IRQ_CONTEXT) {
		/* only low irq ctx is supported. */
		DRM_ERROR("DM_IRQ: invalid context: %d!\n",
				int_params->int_context);
		return;
	}

	amdgpu_dm_irq_register_timer(adev, int_params, ih, args);
}

void dal_isr_acquire_lock(struct dc_context *ctx)
{
	/*TODO*/
}

void dal_isr_release_lock(struct dc_context *ctx)
{
	/*TODO*/
}

/******************************************************************************
 * End-of-IRQ Interfaces.
 *****************************************************************************/

bool dm_get_platform_info(struct dc_context *ctx,
			struct platform_info_params *params)
{
	/*TODO*/
	return false;
}

bool dm_write_persistent_data(struct dc_context *ctx,
		const struct dc_sink *sink,
		const char *module_name,
		const char *key_name,
		void *params,
		unsigned int size,
		struct persistent_data_flag *flag)
{
	/*TODO implement*/
	return false;
}

bool dm_read_persistent_data(struct dc_context *ctx,
				const struct dc_sink *sink,
				const char *module_name,
				const char *key_name,
				void *params,
				unsigned int size,
				struct persistent_data_flag *flag)
{
	/*TODO implement*/
	return false;
}

void dm_delay_in_microseconds(struct dc_context *ctx,
					unsigned int microSeconds)
{
	/*TODO implement*/
	return;
}

/**** power component interfaces ****/

bool dm_pp_pre_dce_clock_change(
		struct dc_context *ctx,
		struct dm_pp_gpu_clock_range *requested_state,
		struct dm_pp_gpu_clock_range *actual_state)
{
	/*TODO*/
	return false;
}

bool dm_pp_apply_safe_state(
		const struct dc_context *ctx)
{
	struct amdgpu_device *adev = ctx->driver_context;

	if (adev->pm.dpm_enabled) {
		/* TODO: Does this require PreModeChange event to PPLIB? */
	}

	return true;
}

bool dm_pp_apply_display_requirements(
		const struct dc_context *ctx,
		const struct dm_pp_display_configuration *pp_display_cfg)
{
	struct amdgpu_device *adev = ctx->driver_context;

	if (adev->pm.dpm_enabled) {

		memset(&adev->pm.pm_display_cfg, 0,
				sizeof(adev->pm.pm_display_cfg));

		adev->pm.pm_display_cfg.cpu_cc6_disable =
			pp_display_cfg->cpu_cc6_disable;

		adev->pm.pm_display_cfg.cpu_pstate_disable =
			pp_display_cfg->cpu_pstate_disable;

		adev->pm.pm_display_cfg.cpu_pstate_separation_time =
			pp_display_cfg->cpu_pstate_separation_time;

		adev->pm.pm_display_cfg.nb_pstate_switch_disable =
			pp_display_cfg->nb_pstate_switch_disable;

		adev->pm.pm_display_cfg.num_display =
				pp_display_cfg->display_count;
		adev->pm.pm_display_cfg.num_path_including_non_display =
				pp_display_cfg->display_count;

		adev->pm.pm_display_cfg.min_core_set_clock =
				pp_display_cfg->min_engine_clock_khz/10;
		adev->pm.pm_display_cfg.min_core_set_clock_in_sr =
				pp_display_cfg->min_engine_clock_deep_sleep_khz/10;
		adev->pm.pm_display_cfg.min_mem_set_clock =
				pp_display_cfg->min_memory_clock_khz/10;

		adev->pm.pm_display_cfg.multi_monitor_in_sync =
				pp_display_cfg->all_displays_in_sync;
		adev->pm.pm_display_cfg.min_vblank_time =
				pp_display_cfg->avail_mclk_switch_time_us;

		adev->pm.pm_display_cfg.display_clk =
				pp_display_cfg->disp_clk_khz/10;

		adev->pm.pm_display_cfg.dce_tolerable_mclk_in_active_latency =
				pp_display_cfg->avail_mclk_switch_time_in_disp_active_us;

		adev->pm.pm_display_cfg.crtc_index = pp_display_cfg->crtc_index;
		adev->pm.pm_display_cfg.line_time_in_us =
				pp_display_cfg->line_time_in_us;

		adev->pm.pm_display_cfg.vrefresh = pp_display_cfg->disp_configs[0].v_refresh;
		adev->pm.pm_display_cfg.crossfire_display_index = -1;
		adev->pm.pm_display_cfg.min_bus_bandwidth = 0;

		/* TODO: complete implementation of
		 * amd_powerplay_display_configuration_change().
		 * Follow example of:
		 * PHM_StoreDALConfigurationData - powerplay\hwmgr\hardwaremanager.c
		 * PP_IRI_DisplayConfigurationChange - powerplay\eventmgr\iri.c */
		amd_powerplay_display_configuration_change(
				adev->powerplay.pp_handle,
				&adev->pm.pm_display_cfg);

		/* TODO: replace by a separate call to 'apply display cfg'? */
		amdgpu_pm_compute_clocks(adev);
	}

	return true;
}

bool dc_service_get_system_clocks_range(
		const struct dc_context *ctx,
		struct dm_pp_gpu_clock_range *sys_clks)
{
	struct amdgpu_device *adev = ctx->driver_context;

	/* Default values, in case PPLib is not compiled-in. */
	sys_clks->mclk.max_khz = 800000;
	sys_clks->mclk.min_khz = 800000;

	sys_clks->sclk.max_khz = 600000;
	sys_clks->sclk.min_khz = 300000;

	if (adev->pm.dpm_enabled) {
		sys_clks->mclk.max_khz = amdgpu_dpm_get_mclk(adev, false);
		sys_clks->mclk.min_khz = amdgpu_dpm_get_mclk(adev, true);

		sys_clks->sclk.max_khz = amdgpu_dpm_get_sclk(adev, false);
		sys_clks->sclk.min_khz = amdgpu_dpm_get_sclk(adev, true);
	}

	return true;
}

static void get_default_clock_levels(
		enum dm_pp_clock_type clk_type,
		struct dm_pp_clock_levels *clks)
{
	uint32_t disp_clks_in_khz[6] = {
			300000, 400000, 496560, 626090, 685720, 757900 };
	uint32_t sclks_in_khz[6] = {
			300000, 360000, 423530, 514290, 626090, 720000 };
	uint32_t mclks_in_khz[2] = { 333000, 800000 };

	switch (clk_type) {
	case DM_PP_CLOCK_TYPE_DISPLAY_CLK:
		clks->num_levels = 6;
		memmove(clks->clocks_in_khz, disp_clks_in_khz,
				sizeof(disp_clks_in_khz));
		break;
	case DM_PP_CLOCK_TYPE_ENGINE_CLK:
		clks->num_levels = 6;
		memmove(clks->clocks_in_khz, sclks_in_khz,
				sizeof(sclks_in_khz));
		break;
	case DM_PP_CLOCK_TYPE_MEMORY_CLK:
		clks->num_levels = 2;
		memmove(clks->clocks_in_khz, mclks_in_khz,
				sizeof(mclks_in_khz));
		break;
	default:
		clks->num_levels = 0;
		break;
	}
}

static enum amd_pp_clock_type dc_to_pp_clock_type(
		enum dm_pp_clock_type dm_pp_clk_type)
{
	enum amd_pp_clock_type amd_pp_clk_type = 0;

	switch (dm_pp_clk_type) {
	case DM_PP_CLOCK_TYPE_DISPLAY_CLK:
		amd_pp_clk_type = amd_pp_disp_clock;
		break;
	case DM_PP_CLOCK_TYPE_ENGINE_CLK:
		amd_pp_clk_type = amd_pp_sys_clock;
		break;
	case DM_PP_CLOCK_TYPE_MEMORY_CLK:
		amd_pp_clk_type = amd_pp_mem_clock;
		break;
	default:
		DRM_ERROR("DM_PPLIB: invalid clock type: %d!\n",
				dm_pp_clk_type);
		break;
	}

	return amd_pp_clk_type;
}

static void pp_to_dc_clock_levels(
		const struct amd_pp_clocks *pp_clks,
		struct dm_pp_clock_levels *dc_clks,
		enum dm_pp_clock_type dc_clk_type)
{
	uint32_t i;

	if (pp_clks->count > DM_PP_MAX_CLOCK_LEVELS) {
		DRM_INFO("DM_PPLIB: Warning: %s clock: number of levels %d exceeds maximum of %d!\n",
				DC_DECODE_PP_CLOCK_TYPE(dc_clk_type),
				pp_clks->count,
				DM_PP_MAX_CLOCK_LEVELS);

		dc_clks->num_levels = DM_PP_MAX_CLOCK_LEVELS;
	} else
		dc_clks->num_levels = pp_clks->count;

	DRM_INFO("DM_PPLIB: values for %s clock\n",
			DC_DECODE_PP_CLOCK_TYPE(dc_clk_type));

	for (i = 0; i < dc_clks->num_levels; i++) {
		DRM_INFO("DM_PPLIB:\t %d\n", pp_clks->clock[i]);
		/* translate 10kHz to kHz */
		dc_clks->clocks_in_khz[i] = pp_clks->clock[i] * 10;
	}
}

bool dm_pp_get_clock_levels_by_type(
		const struct dc_context *ctx,
		enum dm_pp_clock_type clk_type,
		struct dm_pp_clock_levels *dc_clks)
{
	struct amdgpu_device *adev = ctx->driver_context;
	void *pp_handle = adev->powerplay.pp_handle;
	struct amd_pp_clocks pp_clks = { 0 };
	struct amd_pp_simple_clock_info validation_clks = { 0 };
	uint32_t i;

	if (amd_powerplay_get_clock_by_type(pp_handle,
			dc_to_pp_clock_type(clk_type), &pp_clks)) {
		/* Error in pplib. Provide default values. */
		get_default_clock_levels(clk_type, dc_clks);
		return true;
	}

	pp_to_dc_clock_levels(&pp_clks, dc_clks, clk_type);

	if (amd_powerplay_get_display_mode_validation_clocks(pp_handle,
			&validation_clks)) {
		/* Error in pplib. Provide default values. */
		DRM_INFO("DM_PPLIB: Warning: using default validation clocks!\n");
		validation_clks.engine_max_clock = 72000;
		validation_clks.memory_max_clock = 80000;
		validation_clks.level = 0;
	}

	DRM_INFO("DM_PPLIB: Validation clocks:\n");
	DRM_INFO("DM_PPLIB:    engine_max_clock: %d\n",
			validation_clks.engine_max_clock);
	DRM_INFO("DM_PPLIB:    memory_max_clock: %d\n",
			validation_clks.memory_max_clock);
	DRM_INFO("DM_PPLIB:    level           : %d\n",
			validation_clks.level);

	/* Translate 10 kHz to kHz. */
	validation_clks.engine_max_clock *= 10;
	validation_clks.memory_max_clock *= 10;

	/* Determine the highest non-boosted level from the Validation Clocks */
	if (clk_type == DM_PP_CLOCK_TYPE_ENGINE_CLK) {
		for (i = 0; i < dc_clks->num_levels; i++) {
			if (dc_clks->clocks_in_khz[i] > validation_clks.engine_max_clock) {
				/* This clock is higher the validation clock.
				 * Than means the previous one is the highest
				 * non-boosted one. */
				DRM_INFO("DM_PPLIB: reducing engine clock level from %d to %d\n",
						dc_clks->num_levels, i + 1);
				dc_clks->num_levels = i;
				break;
			}
		}
	} else if (clk_type == DM_PP_CLOCK_TYPE_MEMORY_CLK) {
		for (i = 0; i < dc_clks->num_levels; i++) {
			if (dc_clks->clocks_in_khz[i] > validation_clks.memory_max_clock) {
				DRM_INFO("DM_PPLIB: reducing memory clock level from %d to %d\n",
						dc_clks->num_levels, i + 1);
				dc_clks->num_levels = i;
				break;
			}
		}
	}

	return true;
}

bool dm_pp_get_clock_levels_by_type_with_latency(
	const struct dc_context *ctx,
	enum dm_pp_clock_type clk_type,
	struct dm_pp_clock_levels_with_latency *clk_level_info)
{
	/* TODO: to be implemented */
	return false;
}

bool dm_pp_get_clock_levels_by_type_with_voltage(
	const struct dc_context *ctx,
	enum dm_pp_clock_type clk_type,
	struct dm_pp_clock_levels_with_voltage *clk_level_info)
{
	/* TODO: to be implemented */
	return false;
}

bool dm_pp_notify_wm_clock_changes(
	const struct dc_context *ctx,
	struct dm_pp_wm_sets_with_clock_ranges *wm_with_clock_ranges)
{
	/* TODO: to be implemented */
	return false;
}

bool dm_pp_apply_power_level_change_request(
	const struct dc_context *ctx,
	struct dm_pp_power_level_change_request *level_change_req)
{
	/* TODO: to be implemented */
	return false;
}

bool dm_pp_apply_clock_for_voltage_request(
	const struct dc_context *ctx,
	struct dm_pp_clock_for_voltage_req *clock_for_voltage_req)
{
	/* TODO: to be implemented */
	return false;
}

bool dm_pp_get_static_clocks(
	const struct dc_context *ctx,
	struct dm_pp_static_clock_info *static_clk_info)
{
	/* TODO: to be implemented */
	return false;
}

/**** end of power component interfaces ****/

/* Calls to notification */

void dal_notify_setmode_complete(struct dc_context *ctx,
	uint32_t h_total,
	uint32_t v_total,
	uint32_t h_active,
	uint32_t v_active,
	uint32_t pix_clk_in_khz)
{
	/*TODO*/
}
/* End of calls to notification */

long dm_get_pid(void)
{
	return current->pid;
}

long dm_get_tgid(void)
{
	return current->tgid;
}