// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * AMD MP2 1.1 communication interfaces
 *
 * Copyright (c) 2022, Advanced Micro Devices, Inc.
 * All Rights Reserved.
 *
 * Author: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
 */
#include <linux/amd-pmf-io.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include <linux/iopoll.h>

#include "amd_sfh_interface.h"

static struct amd_mp2_dev *emp2;

static int amd_sfh_wait_response(struct amd_mp2_dev *mp2, u8 sid, u32 cmd_id)
{
        struct sfh_cmd_response cmd_resp;

        /* Get response with status within a max of 10000 ms timeout */
        if (!readl_poll_timeout(mp2->mmio + amd_get_p2c_val(mp2, 0), cmd_resp.resp,
                                (cmd_resp.response.response == 0 &&
                                cmd_resp.response.cmd_id == cmd_id && (sid == 0xff ||
                                cmd_resp.response.sensor_id == sid)), 500, 10000000))
                return cmd_resp.response.response;

        return -1;
}

static void amd_start_sensor(struct amd_mp2_dev *privdata, struct amd_mp2_sensor_info info)
{
        struct sfh_cmd_base cmd_base;

        cmd_base.ul = 0;
        cmd_base.cmd.cmd_id = ENABLE_SENSOR;
        cmd_base.cmd.intr_disable = 0;
        cmd_base.cmd.sub_cmd_value = 1;
        cmd_base.cmd.sensor_id = info.sensor_idx;

        writel(cmd_base.ul, privdata->mmio + amd_get_c2p_val(privdata, 0));
}

static void amd_stop_sensor(struct amd_mp2_dev *privdata, u16 sensor_idx)
{
        struct sfh_cmd_base cmd_base;

        cmd_base.ul = 0;
        cmd_base.cmd.cmd_id = DISABLE_SENSOR;
        cmd_base.cmd.intr_disable = 0;
        cmd_base.cmd.sub_cmd_value = 1;
        cmd_base.cmd.sensor_id = sensor_idx;

        writeq(0x0, privdata->mmio + amd_get_c2p_val(privdata, 1));
        writel(cmd_base.ul, privdata->mmio + amd_get_c2p_val(privdata, 0));
}

static void amd_stop_all_sensor(struct amd_mp2_dev *privdata)
{
        struct sfh_cmd_base cmd_base;

        cmd_base.ul = 0;
        cmd_base.cmd.cmd_id = DISABLE_SENSOR;
        cmd_base.cmd.intr_disable = 0;
        /* 0xf indicates all sensors */
        cmd_base.cmd.sensor_id = 0xf;

        writel(cmd_base.ul, privdata->mmio + amd_get_c2p_val(privdata, 0));
}

static struct amd_mp2_ops amd_sfh_ops = {
        .start = amd_start_sensor,
        .stop = amd_stop_sensor,
        .stop_all = amd_stop_all_sensor,
        .response = amd_sfh_wait_response,
};

void sfh_deinit_emp2(void)
{
        emp2 = NULL;
}

void sfh_interface_init(struct amd_mp2_dev *mp2)
{
        mp2->mp2_ops = &amd_sfh_ops;
        emp2 = mp2;
}

static int amd_sfh_mode_info(u32 *platform_type, u32 *laptop_placement)
{
        struct sfh_op_mode mode;

        if (!platform_type || !laptop_placement)
                return -EINVAL;

        if (!emp2 || !emp2->dev_en.is_sra_present)
                return -ENODEV;

        mode.val = readl(emp2->mmio + amd_get_c2p_val(emp2, 3));

        *platform_type = mode.op_mode.devicemode;

        if (mode.op_mode.ontablestate == 1) {
                *laptop_placement = ON_TABLE;
        } else if (mode.op_mode.ontablestate == 2) {
                *laptop_placement = ON_LAP_MOTION;
        } else if (mode.op_mode.inbagstate == 1) {
                *laptop_placement = IN_BAG;
        } else if (mode.op_mode.outbagstate == 1) {
                *laptop_placement = OUT_OF_BAG;
        } else if (mode.op_mode.ontablestate == 0 || mode.op_mode.inbagstate == 0 ||
                 mode.op_mode.outbagstate == 0) {
                *laptop_placement = LP_UNKNOWN;
                pr_warn_once("Unknown laptop placement\n");
        } else if (mode.op_mode.ontablestate == 3 || mode.op_mode.inbagstate == 3 ||
                 mode.op_mode.outbagstate == 3) {
                *laptop_placement = LP_UNDEFINED;
                pr_warn_once("Undefined laptop placement\n");
        }

        return 0;
}

static int amd_sfh_hpd_info(u8 *user_present)
{
        struct hpd_status hpdstatus;

        if (!user_present)
                return -EINVAL;

        if (!emp2 || !emp2->dev_en.is_hpd_present || !emp2->dev_en.is_hpd_enabled)
                return -ENODEV;

        hpdstatus.val = readl(emp2->mmio + amd_get_c2p_val(emp2, 4));
        *user_present = hpdstatus.shpd.presence;

        return 0;
}

static int amd_sfh_als_info(u32 *ambient_light)
{
        struct sfh_als_data als_data;
        void __iomem *sensoraddr;

        if (!ambient_light)
                return -EINVAL;

        if (!emp2 || !emp2->dev_en.is_als_present)
                return -ENODEV;

        sensoraddr = emp2->vsbase +
                (ALS_IDX * SENSOR_DATA_MEM_SIZE_DEFAULT) +
                OFFSET_SENSOR_DATA_DEFAULT;
        memcpy_fromio(&als_data, sensoraddr, sizeof(struct sfh_als_data));
        *ambient_light = amd_sfh_float_to_int(als_data.lux);

        return 0;
}

int amd_get_sfh_info(struct amd_sfh_info *sfh_info, enum sfh_message_type op)
{
        if (sfh_info) {
                switch (op) {
                case MT_HPD:
                        return amd_sfh_hpd_info(&sfh_info->user_present);
                case MT_ALS:
                        return amd_sfh_als_info(&sfh_info->ambient_light);
                case MT_SRA:
                        return amd_sfh_mode_info(&sfh_info->platform_type,
                                                 &sfh_info->laptop_placement);
                }
        }
        return -EINVAL;
}
EXPORT_SYMBOL_GPL(amd_get_sfh_info);