/*
 * Copyright 2016 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 <linux/firmware.h>
#include <drm/drmP.h>
#include "amdgpu.h"
#include "amdgpu_vcn.h"
#include "soc15d.h"
#include "soc15_common.h"

#include "vega10/soc15ip.h"
#include "raven1/VCN/vcn_1_0_offset.h"
#include "raven1/VCN/vcn_1_0_sh_mask.h"
#include "vega10/HDP/hdp_4_0_offset.h"
#include "raven1/MMHUB/mmhub_9_1_offset.h"
#include "raven1/MMHUB/mmhub_9_1_sh_mask.h"

static int vcn_v1_0_start(struct amdgpu_device *adev);
static int vcn_v1_0_stop(struct amdgpu_device *adev);

/**
 * vcn_v1_0_early_init - set function pointers
 *
 * @handle: amdgpu_device pointer
 *
 * Set ring and irq function pointers
 */
static int vcn_v1_0_early_init(void *handle)
{
	return 0;
}

/**
 * vcn_v1_0_sw_init - sw init for VCN block
 *
 * @handle: amdgpu_device pointer
 *
 * Load firmware and sw initialization
 */
static int vcn_v1_0_sw_init(void *handle)
{
	int r;
	struct amdgpu_device *adev = (struct amdgpu_device *)handle;

	/* VCN TRAP */
	r = amdgpu_irq_add_id(adev, AMDGPU_IH_CLIENTID_VCN, 124, &adev->vcn.irq);
	if (r)
		return r;

	r = amdgpu_vcn_sw_init(adev);
	if (r)
		return r;

	r = amdgpu_vcn_resume(adev);
	if (r)
		return r;

	return r;
}

/**
 * vcn_v1_0_sw_fini - sw fini for VCN block
 *
 * @handle: amdgpu_device pointer
 *
 * VCN suspend and free up sw allocation
 */
static int vcn_v1_0_sw_fini(void *handle)
{
	int r;
	struct amdgpu_device *adev = (struct amdgpu_device *)handle;

	r = amdgpu_vcn_suspend(adev);
	if (r)
		return r;

	r = amdgpu_vcn_sw_fini(adev);

	return r;
}

/**
 * vcn_v1_0_hw_init - start and test VCN block
 *
 * @handle: amdgpu_device pointer
 *
 * Initialize the hardware, boot up the VCPU and do some testing
 */
static int vcn_v1_0_hw_init(void *handle)
{
	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
	struct amdgpu_ring *ring = &adev->vcn.ring_dec;
	int r;

	r = vcn_v1_0_start(adev);
	if (r)
		goto done;

	ring->ready = true;
	r = amdgpu_ring_test_ring(ring);
	if (r) {
		ring->ready = false;
		goto done;
	}

done:
	if (!r)
		DRM_INFO("VCN decode initialized successfully.\n");

	return r;
}

/**
 * vcn_v1_0_hw_fini - stop the hardware block
 *
 * @handle: amdgpu_device pointer
 *
 * Stop the VCN block, mark ring as not ready any more
 */
static int vcn_v1_0_hw_fini(void *handle)
{
	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
	struct amdgpu_ring *ring = &adev->vcn.ring_dec;
	int r;

	r = vcn_v1_0_stop(adev);
	if (r)
		return r;

	ring->ready = false;

	return 0;
}

/**
 * vcn_v1_0_suspend - suspend VCN block
 *
 * @handle: amdgpu_device pointer
 *
 * HW fini and suspend VCN block
 */
static int vcn_v1_0_suspend(void *handle)
{
	int r;
	struct amdgpu_device *adev = (struct amdgpu_device *)handle;

	r = vcn_v1_0_hw_fini(adev);
	if (r)
		return r;

	r = amdgpu_vcn_suspend(adev);

	return r;
}

/**
 * vcn_v1_0_resume - resume VCN block
 *
 * @handle: amdgpu_device pointer
 *
 * Resume firmware and hw init VCN block
 */
static int vcn_v1_0_resume(void *handle)
{
	int r;
	struct amdgpu_device *adev = (struct amdgpu_device *)handle;

	r = amdgpu_vcn_resume(adev);
	if (r)
		return r;

	r = vcn_v1_0_hw_init(adev);

	return r;
}

/**
 * vcn_v1_0_mc_resume - memory controller programming
 *
 * @adev: amdgpu_device pointer
 *
 * Let the VCN memory controller know it's offsets
 */
static void vcn_v1_0_mc_resume(struct amdgpu_device *adev)
{
	uint64_t offset;
	uint32_t size;

	/* programm memory controller bits 0-27 */
	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_LMI_VCPU_CACHE_64BIT_BAR_LOW),
			lower_32_bits(adev->vcn.gpu_addr));
	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_LMI_VCPU_CACHE_64BIT_BAR_HIGH),
			upper_32_bits(adev->vcn.gpu_addr));

	/* Current FW has no signed header, but will be added later on */
	/* offset = AMDGPU_VCN_FIRMWARE_OFFSET; */
	offset = 0;
	size = AMDGPU_GPU_PAGE_ALIGN(adev->vcn.fw->size + 4);
	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_VCPU_CACHE_OFFSET0), offset >> 3);
	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_VCPU_CACHE_SIZE0), size);

	offset += size;
	size = AMDGPU_VCN_HEAP_SIZE;
	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_VCPU_CACHE_OFFSET1), offset >> 3);
	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_VCPU_CACHE_SIZE1), size);

	offset += size;
	size = AMDGPU_VCN_STACK_SIZE + (AMDGPU_VCN_SESSION_SIZE * 40);
	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_VCPU_CACHE_OFFSET2), offset >> 3);
	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_VCPU_CACHE_SIZE2), size);

	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_UDEC_ADDR_CONFIG),
			adev->gfx.config.gb_addr_config);
	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_UDEC_DB_ADDR_CONFIG),
			adev->gfx.config.gb_addr_config);
	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_UDEC_DBW_ADDR_CONFIG),
			adev->gfx.config.gb_addr_config);
}

/**
 * vcn_v1_0_start - start VCN block
 *
 * @adev: amdgpu_device pointer
 *
 * Setup and start the VCN block
 */
static int vcn_v1_0_start(struct amdgpu_device *adev)
{
	uint32_t lmi_swap_cntl;
	int i, j, r;

	/* disable byte swapping */
	lmi_swap_cntl = 0;

	vcn_v1_0_mc_resume(adev);

	/* disable clock gating */
	WREG32_P(SOC15_REG_OFFSET(UVD, 0, mmUVD_CGC_CTRL), 0,
			~UVD_CGC_CTRL__DYN_CLOCK_MODE_MASK);

	/* disable interupt */
	WREG32_P(SOC15_REG_OFFSET(UVD, 0, mmUVD_MASTINT_EN), 0,
			~UVD_MASTINT_EN__VCPU_EN_MASK);

	/* stall UMC and register bus before resetting VCPU */
	WREG32_P(SOC15_REG_OFFSET(UVD, 0, mmUVD_LMI_CTRL2),
			UVD_LMI_CTRL2__STALL_ARB_UMC_MASK,
			~UVD_LMI_CTRL2__STALL_ARB_UMC_MASK);
	mdelay(1);

	/* put LMI, VCPU, RBC etc... into reset */
	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_SOFT_RESET),
		UVD_SOFT_RESET__LMI_SOFT_RESET_MASK |
		UVD_SOFT_RESET__VCPU_SOFT_RESET_MASK |
		UVD_SOFT_RESET__LBSI_SOFT_RESET_MASK |
		UVD_SOFT_RESET__RBC_SOFT_RESET_MASK |
		UVD_SOFT_RESET__CSM_SOFT_RESET_MASK |
		UVD_SOFT_RESET__CXW_SOFT_RESET_MASK |
		UVD_SOFT_RESET__TAP_SOFT_RESET_MASK |
		UVD_SOFT_RESET__LMI_UMC_SOFT_RESET_MASK);
	mdelay(5);

	/* initialize VCN memory controller */
	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_LMI_CTRL),
		(0x40 << UVD_LMI_CTRL__WRITE_CLEAN_TIMER__SHIFT) |
		UVD_LMI_CTRL__WRITE_CLEAN_TIMER_EN_MASK |
		UVD_LMI_CTRL__DATA_COHERENCY_EN_MASK |
		UVD_LMI_CTRL__VCPU_DATA_COHERENCY_EN_MASK |
		UVD_LMI_CTRL__REQ_MODE_MASK |
		0x00100000L);

#ifdef __BIG_ENDIAN
	/* swap (8 in 32) RB and IB */
	lmi_swap_cntl = 0xa;
#endif
	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_LMI_SWAP_CNTL), lmi_swap_cntl);

	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_MPC_SET_MUXA0), 0x40c2040);
	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_MPC_SET_MUXA1), 0x0);
	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_MPC_SET_MUXB0), 0x40c2040);
	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_MPC_SET_MUXB1), 0x0);
	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_MPC_SET_ALU), 0);
	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_MPC_SET_MUX), 0x88);

	/* take all subblocks out of reset, except VCPU */
	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_SOFT_RESET),
			UVD_SOFT_RESET__VCPU_SOFT_RESET_MASK);
	mdelay(5);

	/* enable VCPU clock */
	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_VCPU_CNTL),
			UVD_VCPU_CNTL__CLK_EN_MASK);

	/* enable UMC */
	WREG32_P(SOC15_REG_OFFSET(UVD, 0, mmUVD_LMI_CTRL2), 0,
			~UVD_LMI_CTRL2__STALL_ARB_UMC_MASK);

	/* boot up the VCPU */
	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_SOFT_RESET), 0);
	mdelay(10);

	for (i = 0; i < 10; ++i) {
		uint32_t status;

		for (j = 0; j < 100; ++j) {
			status = RREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_STATUS));
			if (status & 2)
				break;
			mdelay(10);
		}
		r = 0;
		if (status & 2)
			break;

		DRM_ERROR("VCN decode not responding, trying to reset the VCPU!!!\n");
		WREG32_P(SOC15_REG_OFFSET(UVD, 0, mmUVD_SOFT_RESET),
				UVD_SOFT_RESET__VCPU_SOFT_RESET_MASK,
				~UVD_SOFT_RESET__VCPU_SOFT_RESET_MASK);
		mdelay(10);
		WREG32_P(SOC15_REG_OFFSET(UVD, 0, mmUVD_SOFT_RESET), 0,
				~UVD_SOFT_RESET__VCPU_SOFT_RESET_MASK);
		mdelay(10);
		r = -1;
	}

	if (r) {
		DRM_ERROR("VCN decode not responding, giving up!!!\n");
		return r;
	}
	/* enable master interrupt */
	WREG32_P(SOC15_REG_OFFSET(UVD, 0, mmUVD_MASTINT_EN),
		(UVD_MASTINT_EN__VCPU_EN_MASK|UVD_MASTINT_EN__SYS_EN_MASK),
		~(UVD_MASTINT_EN__VCPU_EN_MASK|UVD_MASTINT_EN__SYS_EN_MASK));

	/* clear the bit 4 of VCN_STATUS */
	WREG32_P(SOC15_REG_OFFSET(UVD, 0, mmUVD_STATUS), 0,
			~(2 << UVD_STATUS__VCPU_REPORT__SHIFT));

	return 0;
}

/**
 * vcn_v1_0_stop - stop VCN block
 *
 * @adev: amdgpu_device pointer
 *
 * stop the VCN block
 */
static int vcn_v1_0_stop(struct amdgpu_device *adev)
{
	/* Stall UMC and register bus before resetting VCPU */
	WREG32_P(SOC15_REG_OFFSET(UVD, 0, mmUVD_LMI_CTRL2),
			UVD_LMI_CTRL2__STALL_ARB_UMC_MASK,
			~UVD_LMI_CTRL2__STALL_ARB_UMC_MASK);
	mdelay(1);

	/* put VCPU into reset */
	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_SOFT_RESET),
			UVD_SOFT_RESET__VCPU_SOFT_RESET_MASK);
	mdelay(5);

	/* disable VCPU clock */
	WREG32(SOC15_REG_OFFSET(UVD, 0, mmUVD_VCPU_CNTL), 0x0);

	/* Unstall UMC and register bus */
	WREG32_P(SOC15_REG_OFFSET(UVD, 0, mmUVD_LMI_CTRL2), 0,
			~UVD_LMI_CTRL2__STALL_ARB_UMC_MASK);

	return 0;
}

static int vcn_v1_0_set_clockgating_state(void *handle,
					  enum amd_clockgating_state state)
{
	/* needed for driver unload*/
	return 0;
}

static const struct amd_ip_funcs vcn_v1_0_ip_funcs = {
	.name = "vcn_v1_0",
	.early_init = vcn_v1_0_early_init,
	.late_init = NULL,
	.sw_init = vcn_v1_0_sw_init,
	.sw_fini = vcn_v1_0_sw_fini,
	.hw_init = vcn_v1_0_hw_init,
	.hw_fini = vcn_v1_0_hw_fini,
	.suspend = vcn_v1_0_suspend,
	.resume = vcn_v1_0_resume,
	.is_idle = NULL /* vcn_v1_0_is_idle */,
	.wait_for_idle = NULL /* vcn_v1_0_wait_for_idle */,
	.check_soft_reset = NULL /* vcn_v1_0_check_soft_reset */,
	.pre_soft_reset = NULL /* vcn_v1_0_pre_soft_reset */,
	.soft_reset = NULL /* vcn_v1_0_soft_reset */,
	.post_soft_reset = NULL /* vcn_v1_0_post_soft_reset */,
	.set_clockgating_state = vcn_v1_0_set_clockgating_state,
	.set_powergating_state = NULL /* vcn_v1_0_set_powergating_state */,
};