/*
 * Copyright 2013 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 "cikd.h"
#include "kv_dpm.h"

int kv_notify_message_to_smu(struct radeon_device *rdev, u32 id)
{
        u32 i;
        u32 tmp = 0;

        WREG32(SMC_MESSAGE_0, id & SMC_MSG_MASK);

        for (i = 0; i < rdev->usec_timeout; i++) {
                if ((RREG32(SMC_RESP_0) & SMC_RESP_MASK) != 0)
                        break;
                udelay(1);
        }
        tmp = RREG32(SMC_RESP_0) & SMC_RESP_MASK;

        if (tmp != 1) {
                if (tmp == 0xFF)
                        return -EINVAL;
                else if (tmp == 0xFE)
                        return -EINVAL;
        }

        return 0;
}

int kv_dpm_get_enable_mask(struct radeon_device *rdev, u32 *enable_mask)
{
        int ret;

        ret = kv_notify_message_to_smu(rdev, PPSMC_MSG_SCLKDPM_GetEnabledMask);

        if (ret == 0)
                *enable_mask = RREG32_SMC(SMC_SYSCON_MSG_ARG_0);

        return ret;
}

int kv_send_msg_to_smc_with_parameter(struct radeon_device *rdev,
                                      PPSMC_Msg msg, u32 parameter)
{

        WREG32(SMC_MSG_ARG_0, parameter);

        return kv_notify_message_to_smu(rdev, msg);
}

static int kv_set_smc_sram_address(struct radeon_device *rdev,
                                   u32 smc_address, u32 limit)
{
        if (smc_address & 3)
                return -EINVAL;
        if ((smc_address + 3) > limit)
                return -EINVAL;

        WREG32(SMC_IND_INDEX_0, smc_address);
        WREG32_P(SMC_IND_ACCESS_CNTL, 0, ~AUTO_INCREMENT_IND_0);

        return 0;
}

int kv_read_smc_sram_dword(struct radeon_device *rdev, u32 smc_address,
                           u32 *value, u32 limit)
{
        int ret;

        ret = kv_set_smc_sram_address(rdev, smc_address, limit);
        if (ret)
                return ret;

        *value = RREG32(SMC_IND_DATA_0);
        return 0;
}

int kv_smc_dpm_enable(struct radeon_device *rdev, bool enable)
{
        if (enable)
                return kv_notify_message_to_smu(rdev, PPSMC_MSG_DPM_Enable);
        else
                return kv_notify_message_to_smu(rdev, PPSMC_MSG_DPM_Disable);
}

int kv_smc_bapm_enable(struct radeon_device *rdev, bool enable)
{
        if (enable)
                return kv_notify_message_to_smu(rdev, PPSMC_MSG_EnableBAPM);
        else
                return kv_notify_message_to_smu(rdev, PPSMC_MSG_DisableBAPM);
}

int kv_copy_bytes_to_smc(struct radeon_device *rdev,
                         u32 smc_start_address,
                         const u8 *src, u32 byte_count, u32 limit)
{
        int ret;
        u32 data, original_data, addr, extra_shift, t_byte, count, mask;

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

        addr = smc_start_address;
        t_byte = addr & 3;

        /* RMW for the initial bytes */
        if  (t_byte != 0) {
                addr -= t_byte;

                ret = kv_set_smc_sram_address(rdev, addr, limit);
                if (ret)
                        return ret;

                original_data = RREG32(SMC_IND_DATA_0);

                data = 0;
                mask = 0;
                count = 4;
                while (count > 0) {
                        if (t_byte > 0) {
                                mask = (mask << 8) | 0xff;
                                t_byte--;
                        } else if (byte_count > 0) {
                                data = (data << 8) + *src++;
                                byte_count--;
                                mask <<= 8;
                        } else {
                                data <<= 8;
                                mask = (mask << 8) | 0xff;
                        }
                        count--;
                }

                data |= original_data & mask;

                ret = kv_set_smc_sram_address(rdev, addr, limit);
                if (ret)
                        return ret;

                WREG32(SMC_IND_DATA_0, data);

                addr += 4;
        }

        while (byte_count >= 4) {
                /* SMC address space is BE */
                data = (src[0] << 24) + (src[1] << 16) + (src[2] << 8) + src[3];

                ret = kv_set_smc_sram_address(rdev, addr, limit);
                if (ret)
                        return ret;

                WREG32(SMC_IND_DATA_0, data);

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

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

                ret = kv_set_smc_sram_address(rdev, addr, limit);
                if (ret)
                        return ret;

                original_data= RREG32(SMC_IND_DATA_0);

                extra_shift = 8 * (4 - byte_count);

                while (byte_count > 0) {
                        /* SMC address space is BE */
                        data = (data << 8) + *src++;
                        byte_count--;
                }

                data <<= extra_shift;

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

                ret = kv_set_smc_sram_address(rdev, addr, limit);
                if (ret)
                        return ret;

                WREG32(SMC_IND_DATA_0, data);
        }
        return 0;
}