/*
 * 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 <linux/firmware.h>
#include <drm/drmP.h>
#include "amdgpu.h"
#include "cikd.h"
#include "ppsmc.h"
#include "amdgpu_ucode.h"
#include "ci_dpm.h"

#include "smu/smu_7_0_1_d.h"
#include "smu/smu_7_0_1_sh_mask.h"

static int ci_set_smc_sram_address(struct amdgpu_device *adev,
                                   u32 smc_address, u32 limit)
{
        if (smc_address & 3)
                return -EINVAL;
        if ((smc_address + 3) > limit)
                return -EINVAL;

        WREG32(mmSMC_IND_INDEX_0, smc_address);
        WREG32_P(mmSMC_IND_ACCESS_CNTL, 0, ~SMC_IND_ACCESS_CNTL__AUTO_INCREMENT_IND_0_MASK);

        return 0;
}

int amdgpu_ci_copy_bytes_to_smc(struct amdgpu_device *adev,
                         u32 smc_start_address,
                         const u8 *src, u32 byte_count, u32 limit)
{
        unsigned long flags;
        u32 data, original_data;
        u32 addr;
        u32 extra_shift;
        int ret = 0;

        if (smc_start_address & 3)
                return -EINVAL;
        if ((smc_start_address + byte_count) > limit)
                return -EINVAL;

        addr = smc_start_address;

        spin_lock_irqsave(&adev->smc_idx_lock, flags);
        while (byte_count >= 4) {
                /* SMC address space is BE */
                data = (src[0] << 24) | (src[1] << 16) | (src[2] << 8) | src[3];

                ret = ci_set_smc_sram_address(adev, addr, limit);
                if (ret)
                        goto done;

                WREG32(mmSMC_IND_DATA_0, data);

                src += 4;
                byte_count -= 4;
                addr += 4;
        }

        /* RMW for the final bytes */
        if (byte_count > 0) {
                data = 0;

                ret = ci_set_smc_sram_address(adev, addr, limit);
                if (ret)
                        goto done;

                original_data = RREG32(mmSMC_IND_DATA_0);

                extra_shift = 8 * (4 - byte_count);

                while (byte_count > 0) {
                        data = (data << 8) + *src++;
                        byte_count--;
                }

                data <<= extra_shift;

                data |= (original_data & ~((~0UL) << extra_shift));

                ret = ci_set_smc_sram_address(adev, addr, limit);
                if (ret)
                        goto done;

                WREG32(mmSMC_IND_DATA_0, data);
        }

done:
        spin_unlock_irqrestore(&adev->smc_idx_lock, flags);

        return ret;
}

void amdgpu_ci_start_smc(struct amdgpu_device *adev)
{
        u32 tmp = RREG32_SMC(ixSMC_SYSCON_RESET_CNTL);

        tmp &= ~SMC_SYSCON_RESET_CNTL__rst_reg_MASK;
        WREG32_SMC(ixSMC_SYSCON_RESET_CNTL, tmp);
}

void amdgpu_ci_reset_smc(struct amdgpu_device *adev)
{
        u32 tmp = RREG32_SMC(ixSMC_SYSCON_RESET_CNTL);

        tmp |= SMC_SYSCON_RESET_CNTL__rst_reg_MASK;
        WREG32_SMC(ixSMC_SYSCON_RESET_CNTL, tmp);
}

int amdgpu_ci_program_jump_on_start(struct amdgpu_device *adev)
{
        static u8 data[] = { 0xE0, 0x00, 0x80, 0x40 };

        return amdgpu_ci_copy_bytes_to_smc(adev, 0x0, data, 4, sizeof(data)+1);
}

void amdgpu_ci_stop_smc_clock(struct amdgpu_device *adev)
{
        u32 tmp = RREG32_SMC(ixSMC_SYSCON_CLOCK_CNTL_0);

        tmp |= SMC_SYSCON_CLOCK_CNTL_0__ck_disable_MASK;

        WREG32_SMC(ixSMC_SYSCON_CLOCK_CNTL_0, tmp);
}

void amdgpu_ci_start_smc_clock(struct amdgpu_device *adev)
{
        u32 tmp = RREG32_SMC(ixSMC_SYSCON_CLOCK_CNTL_0);

        tmp &= ~SMC_SYSCON_CLOCK_CNTL_0__ck_disable_MASK;

        WREG32_SMC(ixSMC_SYSCON_CLOCK_CNTL_0, tmp);
}

bool amdgpu_ci_is_smc_running(struct amdgpu_device *adev)
{
        u32 clk = RREG32_SMC(ixSMC_SYSCON_CLOCK_CNTL_0);
        u32 pc_c = RREG32_SMC(ixSMC_PC_C);

        if (!(clk & SMC_SYSCON_CLOCK_CNTL_0__ck_disable_MASK) && (0x20100 <= pc_c))
                return true;

        return false;
}

PPSMC_Result amdgpu_ci_send_msg_to_smc(struct amdgpu_device *adev, PPSMC_Msg msg)
{
        u32 tmp;
        int i;

        if (!amdgpu_ci_is_smc_running(adev))
                return PPSMC_Result_Failed;

        WREG32(mmSMC_MESSAGE_0, msg);

        for (i = 0; i < adev->usec_timeout; i++) {
                tmp = RREG32(mmSMC_RESP_0);
                if (tmp != 0)
                        break;
                udelay(1);
        }
        tmp = RREG32(mmSMC_RESP_0);

        return (PPSMC_Result)tmp;
}

PPSMC_Result amdgpu_ci_wait_for_smc_inactive(struct amdgpu_device *adev)
{
        u32 tmp;
        int i;

        if (!amdgpu_ci_is_smc_running(adev))
                return PPSMC_Result_OK;

        for (i = 0; i < adev->usec_timeout; i++) {
                tmp = RREG32_SMC(ixSMC_SYSCON_CLOCK_CNTL_0);
                if ((tmp & SMC_SYSCON_CLOCK_CNTL_0__cken_MASK) == 0)
                        break;
                udelay(1);
        }

        return PPSMC_Result_OK;
}

int amdgpu_ci_load_smc_ucode(struct amdgpu_device *adev, u32 limit)
{
        const struct smc_firmware_header_v1_0 *hdr;
        unsigned long flags;
        u32 ucode_start_address;
        u32 ucode_size;
        const u8 *src;
        u32 data;

        if (!adev->pm.fw)
                return -EINVAL;

        hdr = (const struct smc_firmware_header_v1_0 *)adev->pm.fw->data;
        amdgpu_ucode_print_smc_hdr(&hdr->header);

        adev->pm.fw_version = le32_to_cpu(hdr->header.ucode_version);
        ucode_start_address = le32_to_cpu(hdr->ucode_start_addr);
        ucode_size = le32_to_cpu(hdr->header.ucode_size_bytes);
        src = (const u8 *)
                (adev->pm.fw->data + le32_to_cpu(hdr->header.ucode_array_offset_bytes));

        if (ucode_size & 3)
                return -EINVAL;

        spin_lock_irqsave(&adev->smc_idx_lock, flags);
        WREG32(mmSMC_IND_INDEX_0, ucode_start_address);
        WREG32_P(mmSMC_IND_ACCESS_CNTL, SMC_IND_ACCESS_CNTL__AUTO_INCREMENT_IND_0_MASK,
                ~SMC_IND_ACCESS_CNTL__AUTO_INCREMENT_IND_0_MASK);
        while (ucode_size >= 4) {
                /* SMC address space is BE */
                data = (src[0] << 24) | (src[1] << 16) | (src[2] << 8) | src[3];

                WREG32(mmSMC_IND_DATA_0, data);

                src += 4;
                ucode_size -= 4;
        }
        WREG32_P(mmSMC_IND_ACCESS_CNTL, 0, ~SMC_IND_ACCESS_CNTL__AUTO_INCREMENT_IND_0_MASK);
        spin_unlock_irqrestore(&adev->smc_idx_lock, flags);

        return 0;
}

int amdgpu_ci_read_smc_sram_dword(struct amdgpu_device *adev,
                           u32 smc_address, u32 *value, u32 limit)
{
        unsigned long flags;
        int ret;

        spin_lock_irqsave(&adev->smc_idx_lock, flags);
        ret = ci_set_smc_sram_address(adev, smc_address, limit);
        if (ret == 0)
                *value = RREG32(mmSMC_IND_DATA_0);
        spin_unlock_irqrestore(&adev->smc_idx_lock, flags);

        return ret;
}

int amdgpu_ci_write_smc_sram_dword(struct amdgpu_device *adev,
                            u32 smc_address, u32 value, u32 limit)
{
        unsigned long flags;
        int ret;

        spin_lock_irqsave(&adev->smc_idx_lock, flags);
        ret = ci_set_smc_sram_address(adev, smc_address, limit);
        if (ret == 0)
                WREG32(mmSMC_IND_DATA_0, value);
        spin_unlock_irqrestore(&adev->smc_idx_lock, flags);

        return ret;
}