// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
//
// This file is provided under a dual BSD/GPLv2 license.  When using or
// redistributing this file, you may do so under either license.
//
// Copyright(c) 2018 Intel Corporation
//
// Authors: Keyon Jie <yang.jie@linux.intel.com>

#include <linux/io.h>
#include <sound/hdaudio.h>
#include <sound/hda_i915.h>
#include <sound/hda_codec.h>
#include <sound/hda_register.h>
#include "../sof-priv.h"
#include "hda.h"

#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_AUDIO_CODEC)
#include "../../codecs/hdac_hda.h"
#define sof_hda_ext_ops snd_soc_hdac_hda_get_ops()

static void update_codec_wake_enable(struct hdac_bus *bus, unsigned int addr, bool link_power)
{
        unsigned int mask = snd_hdac_chip_readw(bus, WAKEEN);

        if (link_power)
                mask &= ~BIT(addr);
        else
                mask |= BIT(addr);

        snd_hdac_chip_updatew(bus, WAKEEN, STATESTS_INT_MASK, mask);
}

static void sof_hda_bus_link_power(struct hdac_device *codec, bool enable)
{
        struct hdac_bus *bus = codec->bus;
        bool oldstate = test_bit(codec->addr, &bus->codec_powered);

        snd_hdac_ext_bus_link_power(codec, enable);

        if (enable == oldstate)
                return;

        /*
         * Both codec driver and controller can hold references to
         * display power. To avoid unnecessary power-up/down cycles,
         * controller doesn't immediately release its reference.
         *
         * If the codec driver powers down the link, release
         * the controller reference as well.
         */
        if (codec->addr == HDA_IDISP_ADDR && !enable)
                snd_hdac_display_power(bus, HDA_CODEC_IDX_CONTROLLER, false);

        /* WAKEEN needs to be set for disabled links */
        update_codec_wake_enable(bus, codec->addr, enable);
}

static const struct hdac_bus_ops bus_core_ops = {
        .command = snd_hdac_bus_send_cmd,
        .get_response = snd_hdac_bus_get_response,
        .link_power = sof_hda_bus_link_power,
};
#endif

/*
 * This can be used for both with/without hda link support.
 */
void sof_hda_bus_init(struct snd_sof_dev *sdev, struct device *dev)
{
        struct hdac_bus *bus = sof_to_bus(sdev);

#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_LINK)
#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_AUDIO_CODEC)
        const struct sof_intel_dsp_desc *chip = get_chip_info(sdev->pdata);

        snd_hdac_ext_bus_init(bus, dev, &bus_core_ops, sof_hda_ext_ops);

        if (chip && chip->hw_ip_version >= SOF_INTEL_ACE_2_0)
                bus->use_pio_for_commands = true;
#else
        snd_hdac_ext_bus_init(bus, dev, NULL, NULL);
#endif
#else

        memset(bus, 0, sizeof(*bus));
        bus->dev = dev;

        INIT_LIST_HEAD(&bus->stream_list);

        bus->irq = -1;

        /*
         * There is only one HDA bus atm. keep the index as 0.
         * Need to fix when there are more than one HDA bus.
         */
        bus->idx = 0;

        spin_lock_init(&bus->reg_lock);
#endif /* CONFIG_SND_SOC_SOF_HDA_LINK */
}
EXPORT_SYMBOL_NS(sof_hda_bus_init, "SND_SOC_SOF_INTEL_HDA_COMMON");

void sof_hda_bus_exit(struct snd_sof_dev *sdev)
{
#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_LINK)
        struct hdac_bus *bus = sof_to_bus(sdev);

        snd_hdac_ext_bus_exit(bus);
#endif
}
EXPORT_SYMBOL_NS(sof_hda_bus_exit, "SND_SOC_SOF_INTEL_HDA_COMMON");