// SPDX-License-Identifier: GPL-2.0
//
// Renesas R-Car DVC support
//
// Copyright (C) 2014 Renesas Solutions Corp.
// Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>

/*
 * Playback Volume
 *      amixer set "DVC Out" 100%
 *
 * Capture Volume
 *      amixer set "DVC In" 100%
 *
 * Playback Mute
 *      amixer set "DVC Out Mute" on
 *
 * Capture Mute
 *      amixer set "DVC In Mute" on
 *
 * Volume Ramp
 *      amixer set "DVC Out Ramp Up Rate"   "0.125 dB/64 steps"
 *      amixer set "DVC Out Ramp Down Rate" "0.125 dB/512 steps"
 *      amixer set "DVC Out Ramp" on
 *      aplay xxx.wav &
 *      amixer set "DVC Out"  80%  // Volume Down
 *      amixer set "DVC Out" 100%  // Volume Up
 */

#include "rsnd.h"

#define RSND_DVC_NAME_SIZE      16

#define DVC_NAME "dvc"

struct rsnd_dvc {
        struct rsnd_mod mod;
        struct rsnd_kctrl_cfg_m volume;
        struct rsnd_kctrl_cfg_m mute;
        struct rsnd_kctrl_cfg_s ren;    /* Ramp Enable */
        struct rsnd_kctrl_cfg_s rup;    /* Ramp Rate Up */
        struct rsnd_kctrl_cfg_s rdown;  /* Ramp Rate Down */
};

#define rsnd_dvc_get(priv, id) ((struct rsnd_dvc *)(priv->dvc) + id)
#define rsnd_dvc_nr(priv) ((priv)->dvc_nr)

#define rsnd_mod_to_dvc(_mod)   \
        container_of((_mod), struct rsnd_dvc, mod)

#define for_each_rsnd_dvc(pos, priv, i)                         \
        for ((i) = 0;                                           \
             ((i) < rsnd_dvc_nr(priv)) &&                       \
             ((pos) = (struct rsnd_dvc *)(priv)->dvc + i);      \
             i++)

static void rsnd_dvc_activation(struct rsnd_mod *mod)
{
        rsnd_mod_write(mod, DVC_SWRSR, 0);
        rsnd_mod_write(mod, DVC_SWRSR, 1);
}

static void rsnd_dvc_halt(struct rsnd_mod *mod)
{
        rsnd_mod_write(mod, DVC_DVUIR, 1);
        rsnd_mod_write(mod, DVC_SWRSR, 0);
}

#define rsnd_dvc_get_vrpdr(dvc) (rsnd_kctrl_vals(dvc->rup) << 8 | \
                                 rsnd_kctrl_vals(dvc->rdown))
#define rsnd_dvc_get_vrdbr(dvc) (0x3ff - (rsnd_kctrl_valm(dvc->volume, 0) >> 13))

static void rsnd_dvc_volume_parameter(struct rsnd_dai_stream *io,
                                              struct rsnd_mod *mod)
{
        struct rsnd_dvc *dvc = rsnd_mod_to_dvc(mod);
        u32 val[RSND_MAX_CHANNELS];
        int i;

        /* Enable Ramp */
        if (rsnd_kctrl_vals(dvc->ren))
                for (i = 0; i < RSND_MAX_CHANNELS; i++)
                        val[i] = rsnd_kctrl_max(dvc->volume);
        else
                for (i = 0; i < RSND_MAX_CHANNELS; i++)
                        val[i] = rsnd_kctrl_valm(dvc->volume, i);

        /* Enable Digital Volume */
        for (i = 0; i < RSND_MAX_CHANNELS; i++)
                rsnd_mod_write(mod, DVC_VOLxR(i), val[i]);
}

static void rsnd_dvc_volume_init(struct rsnd_dai_stream *io,
                                 struct rsnd_mod *mod)
{
        struct rsnd_dvc *dvc = rsnd_mod_to_dvc(mod);
        u32 adinr = 0;
        u32 dvucr = 0;
        u32 vrctr = 0;
        u32 vrpdr = 0;
        u32 vrdbr = 0;

        adinr = rsnd_get_adinr_bit(mod, io) |
                rsnd_runtime_channel_after_ctu(io);

        /* Enable Digital Volume, Zero Cross Mute Mode */
        dvucr |= 0x101;

        /* Enable Ramp */
        if (rsnd_kctrl_vals(dvc->ren)) {
                dvucr |= 0x10;

                /*
                 * FIXME !!
                 * use scale-downed Digital Volume
                 * as Volume Ramp
                 * 7F FFFF -> 3FF
                 */
                vrctr = 0xff;
                vrpdr = rsnd_dvc_get_vrpdr(dvc);
                vrdbr = rsnd_dvc_get_vrdbr(dvc);
        }

        /* Initialize operation */
        rsnd_mod_write(mod, DVC_DVUIR, 1);

        /* General Information */
        rsnd_mod_write(mod, DVC_ADINR, adinr);
        rsnd_mod_write(mod, DVC_DVUCR, dvucr);

        /* Volume Ramp Parameter */
        rsnd_mod_write(mod, DVC_VRCTR, vrctr);
        rsnd_mod_write(mod, DVC_VRPDR, vrpdr);
        rsnd_mod_write(mod, DVC_VRDBR, vrdbr);

        /* Digital Volume Function Parameter */
        rsnd_dvc_volume_parameter(io, mod);

        /* cancel operation */
        rsnd_mod_write(mod, DVC_DVUIR, 0);
}

static void rsnd_dvc_volume_update(struct rsnd_dai_stream *io,
                                   struct rsnd_mod *mod)
{
        struct rsnd_dvc *dvc = rsnd_mod_to_dvc(mod);
        u32 zcmcr = 0;
        u32 vrpdr = 0;
        u32 vrdbr = 0;
        int i;

        for (i = 0; i < rsnd_kctrl_size(dvc->mute); i++)
                zcmcr |= (!!rsnd_kctrl_valm(dvc->mute, i)) << i;

        if (rsnd_kctrl_vals(dvc->ren)) {
                vrpdr = rsnd_dvc_get_vrpdr(dvc);
                vrdbr = rsnd_dvc_get_vrdbr(dvc);
        }

        /* Disable DVC Register access */
        rsnd_mod_write(mod, DVC_DVUER, 0);

        /* Zero Cross Mute Function */
        rsnd_mod_write(mod, DVC_ZCMCR, zcmcr);

        /* Volume Ramp Function */
        rsnd_mod_write(mod, DVC_VRPDR, vrpdr);
        rsnd_mod_write(mod, DVC_VRDBR, vrdbr);
        /* add DVC_VRWTR here */

        /* Digital Volume Function Parameter */
        rsnd_dvc_volume_parameter(io, mod);

        /* Enable DVC Register access */
        rsnd_mod_write(mod, DVC_DVUER, 1);
}

static int rsnd_dvc_probe_(struct rsnd_mod *mod,
                           struct rsnd_dai_stream *io,
                           struct rsnd_priv *priv)
{
        return rsnd_cmd_attach(io, rsnd_mod_id(mod));
}

static int rsnd_dvc_init(struct rsnd_mod *mod,
                         struct rsnd_dai_stream *io,
                         struct rsnd_priv *priv)
{
        int ret;

        ret = rsnd_mod_power_on(mod);
        if (ret < 0)
                return ret;

        rsnd_dvc_activation(mod);

        rsnd_dvc_volume_init(io, mod);

        rsnd_dvc_volume_update(io, mod);

        return 0;
}

static int rsnd_dvc_quit(struct rsnd_mod *mod,
                         struct rsnd_dai_stream *io,
                         struct rsnd_priv *priv)
{
        rsnd_dvc_halt(mod);

        rsnd_mod_power_off(mod);

        return 0;
}

static int rsnd_dvc_pcm_new(struct rsnd_mod *mod,
                            struct rsnd_dai_stream *io,
                            struct snd_soc_pcm_runtime *rtd)
{
        struct rsnd_dvc *dvc = rsnd_mod_to_dvc(mod);
        struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
        int is_play = rsnd_io_is_play(io);
        int channels = rsnd_rdai_channels_get(rdai);
        int ret;

        /* Volume */
        ret = rsnd_kctrl_new_m(mod, io, rtd,
                        is_play ?
                        "DVC Out Playback Volume" : "DVC In Capture Volume",
                        rsnd_kctrl_accept_anytime,
                        rsnd_dvc_volume_update,
                        &dvc->volume, channels,
                        0x00800000 - 1);
        if (ret < 0)
                return ret;

        /* Mute */
        ret = rsnd_kctrl_new_m(mod, io, rtd,
                        is_play ?
                        "DVC Out Mute Switch" : "DVC In Mute Switch",
                        rsnd_kctrl_accept_anytime,
                        rsnd_dvc_volume_update,
                        &dvc->mute, channels,
                        1);
        if (ret < 0)
                return ret;

        /* Ramp */
        ret = rsnd_kctrl_new_s(mod, io, rtd,
                        is_play ?
                        "DVC Out Ramp Switch" : "DVC In Ramp Switch",
                        rsnd_kctrl_accept_anytime,
                        rsnd_dvc_volume_update,
                        &dvc->ren, 1);
        if (ret < 0)
                return ret;

        ret = rsnd_kctrl_new_e(mod, io, rtd,
                        is_play ?
                        "DVC Out Ramp Up Rate" : "DVC In Ramp Up Rate",
                        rsnd_kctrl_accept_anytime,
                        rsnd_dvc_volume_update,
                        &dvc->rup,
                        volume_ramp_rate,
                        VOLUME_RAMP_MAX_DVC);
        if (ret < 0)
                return ret;

        ret = rsnd_kctrl_new_e(mod, io, rtd,
                        is_play ?
                        "DVC Out Ramp Down Rate" : "DVC In Ramp Down Rate",
                        rsnd_kctrl_accept_anytime,
                        rsnd_dvc_volume_update,
                        &dvc->rdown,
                        volume_ramp_rate,
                        VOLUME_RAMP_MAX_DVC);

        if (ret < 0)
                return ret;

        return 0;
}

static struct dma_chan *rsnd_dvc_dma_req(struct rsnd_dai_stream *io,
                                         struct rsnd_mod *mod)
{
        struct rsnd_priv *priv = rsnd_mod_to_priv(mod);

        return rsnd_dma_request_channel(rsnd_dvc_of_node(priv),
                                        DVC_NAME, mod, "tx");
}

#ifdef CONFIG_DEBUG_FS
static void rsnd_dvc_debug_info(struct seq_file *m,
                                struct rsnd_dai_stream *io,
                                struct rsnd_mod *mod)
{
        rsnd_debugfs_mod_reg_show(m, mod, RSND_BASE_SCU,
                                  0xe00 + rsnd_mod_id(mod) * 0x100, 0x60);
}
#define DEBUG_INFO .debug_info = rsnd_dvc_debug_info
#else
#define DEBUG_INFO
#endif

static struct rsnd_mod_ops rsnd_dvc_ops = {
        .name           = DVC_NAME,
        .dma_req        = rsnd_dvc_dma_req,
        .probe          = rsnd_dvc_probe_,
        .init           = rsnd_dvc_init,
        .quit           = rsnd_dvc_quit,
        .pcm_new        = rsnd_dvc_pcm_new,
        .get_status     = rsnd_mod_get_status,
        DEBUG_INFO
};

struct rsnd_mod *rsnd_dvc_mod_get(struct rsnd_priv *priv, int id)
{
        if (WARN_ON(id < 0 || id >= rsnd_dvc_nr(priv)))
                id = 0;

        return rsnd_mod_get(rsnd_dvc_get(priv, id));
}

int rsnd_dvc_probe(struct rsnd_priv *priv)
{
        struct device_node *node;
        struct device *dev = rsnd_priv_to_dev(priv);
        struct rsnd_dvc *dvc;
        struct clk *clk;
        char name[RSND_DVC_NAME_SIZE];
        int i, nr, ret;

        node = rsnd_dvc_of_node(priv);
        if (!node)
                return 0; /* not used is not error */

        nr = of_get_child_count(node);
        if (!nr) {
                ret = -EINVAL;
                goto rsnd_dvc_probe_done;
        }

        dvc     = devm_kcalloc(dev, nr, sizeof(*dvc), GFP_KERNEL);
        if (!dvc) {
                ret = -ENOMEM;
                goto rsnd_dvc_probe_done;
        }

        priv->dvc_nr    = nr;
        priv->dvc       = dvc;

        i = 0;
        ret = 0;
        for_each_child_of_node_scoped(node, np) {
                dvc = rsnd_dvc_get(priv, i);

                snprintf(name, RSND_DVC_NAME_SIZE, "%s.%d",
                         DVC_NAME, i);

                clk = devm_clk_get(dev, name);
                if (IS_ERR(clk)) {
                        ret = PTR_ERR(clk);
                        goto rsnd_dvc_probe_done;
                }

                ret = rsnd_mod_init(priv, rsnd_mod_get(dvc), &rsnd_dvc_ops,
                                    clk, RSND_MOD_DVC, i);
                if (ret)
                        goto rsnd_dvc_probe_done;

                i++;
        }

rsnd_dvc_probe_done:
        of_node_put(node);

        return ret;
}

void rsnd_dvc_remove(struct rsnd_priv *priv)
{
        struct rsnd_dvc *dvc;
        int i;

        for_each_rsnd_dvc(dvc, priv, i) {
                rsnd_mod_quit(rsnd_mod_get(dvc));
        }
}