/* $OpenBSD: rkdwhdmi.c,v 1.9 2025/03/24 11:26:59 jmatthew Exp $ */
/* $NetBSD: rk_dwhdmi.c,v 1.4 2019/12/17 18:26:36 jakllsch Exp $ */

/*-
 * Copyright (c) 2019 Jared D. McNeill <jmcneill@invisible.ca>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/device.h>
#include <sys/systm.h>
#include <sys/kernel.h>

#include <machine/bus.h>
#include <machine/fdt.h>

#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_clock.h>
#include <dev/ofw/ofw_misc.h>
#include <dev/ofw/ofw_pinctrl.h>
#include <dev/ofw/fdt.h>

#include <drm/drm_crtc_helper.h>
#include <drm/drm_atomic_helper.h>

#include <dev/ic/dwhdmi.h>

#define RK3399_GRF_SOC_CON20            0x6250
#define  HDMI_LCDC_SEL                  (1 << 6)

const struct dwhdmi_mpll_config rkdwhdmi_mpll_config[] = {
        { 40000,        0x00b3, 0x0000, 0x0018 },
        { 65000,        0x0072, 0x0001, 0x0028 },
        { 66000,        0x013e, 0x0003, 0x0038 },
        { 83500,        0x0072, 0x0001, 0x0028 },
        { 146250,       0x0051, 0x0002, 0x0038 },
        { 148500,       0x0051, 0x0003, 0x0000 },
        { 272000,       0x0040, 0x0003, 0x0000 },
        { 340000,       0x0040, 0x0003, 0x0000 },
        { 0,            0x0051, 0x0003, 0x0000 },
};

const struct dwhdmi_phy_config rkdwhdmi_phy_config[] = {
        { 74250,        0x8009, 0x0004, 0x0272 },
        { 148500,       0x802b, 0x0004, 0x028d },
        { 297000,       0x8039, 0x0005, 0x028d },
        { 594000,       0x8039, 0x0000, 0x019d },
        { 0,            0x0000, 0x0000, 0x0000 }
};

struct rkdwhdmi_softc {
        struct dwhdmi_softc     sc_base;
        int                     sc_node;
        int                     sc_clk_vpll;

        struct drm_display_mode sc_curmode;
        struct drm_encoder      sc_encoder;
        struct regmap           *sc_grf;

        int                     sc_activated;

        struct device_ports     sc_ports;
};

#define to_rkdwhdmi_softc(x)    container_of(x, struct rkdwhdmi_softc, sc_base)
#define to_rkdwhdmi_encoder(x)  container_of(x, struct rkdwhdmi_softc, sc_encoder)

int rkdwhdmi_match(struct device *, void *, void *);
void rkdwhdmi_attach(struct device *, struct device *, void *);

void rkdwhdmi_select_input(struct rkdwhdmi_softc *, u_int);
void rkdwhdmi_encoder_enable(struct drm_encoder *);

int rkdwhdmi_ep_activate(void *, struct endpoint *, void *);
void *rkdwhdmi_ep_get_cookie(void *, struct endpoint *);

void rkdwhdmi_enable(struct dwhdmi_softc *);
void rkdwhdmi_mode_set(struct dwhdmi_softc *, const struct drm_display_mode *,
    const struct drm_display_mode *);
enum drm_mode_status rkdwhdmi_mode_valid(struct dwhdmi_softc *,
    const struct drm_display_mode *);

const struct cfattach rkdwhdmi_ca = {
        sizeof (struct rkdwhdmi_softc), rkdwhdmi_match, rkdwhdmi_attach
};

struct cfdriver rkdwhdmi_cd = {
        NULL, "rkdwhdmi", DV_DULL
};

int
rkdwhdmi_match(struct device *parent, void *match, void *aux)
{
        struct fdt_attach_args *faa = aux;

        return OF_is_compatible(faa->fa_node, "rockchip,rk3399-dw-hdmi");
}

void
rkdwhdmi_attach(struct device *parent, struct device *self, void *aux)
{
        struct rkdwhdmi_softc *sc = (struct rkdwhdmi_softc *)self;
        struct fdt_attach_args *faa = aux;
        uint32_t grf;
        uint32_t phandle;

        if (faa->fa_nreg < 1) {
                printf(": no registers\n");
                return;
        }

        pinctrl_byname(faa->fa_node, "default");

        clock_enable(faa->fa_node, "iahb");
        clock_enable(faa->fa_node, "isfr");
        clock_enable(faa->fa_node, "vpll");
        clock_enable(faa->fa_node, "grf");
        clock_enable(faa->fa_node, "cec");

        sc->sc_base.sc_reg_width =
            OF_getpropint(faa->fa_node, "reg-io-width", 4);

        sc->sc_base.sc_bst = faa->fa_iot;
        if (bus_space_map(sc->sc_base.sc_bst, faa->fa_reg[0].addr,
            faa->fa_reg[0].size, 0, &sc->sc_base.sc_bsh)) {
                printf(": can't map registers\n");
                return;
        }

        sc->sc_node = faa->fa_node;
        sc->sc_clk_vpll = OF_getindex(faa->fa_node, "vpll", "clock-names");

        grf = OF_getpropint(faa->fa_node, "rockchip,grf", 0);
        sc->sc_grf = regmap_byphandle(grf);
        if (sc->sc_grf == NULL) {
                printf(": can't get grf\n");
                return;
        }

        printf(": HDMI TX\n");

        phandle = OF_getpropint(faa->fa_node, "ddc-i2c-bus", 0);
        sc->sc_base.sc_ic = i2c_byphandle(phandle);
        if (phandle && sc->sc_base.sc_ic == NULL) {
                printf("%s: couldn't find external I2C master\n",
                    self->dv_xname);
                return;
        }

        sc->sc_base.sc_flags |= DWHDMI_USE_INTERNAL_PHY;
        sc->sc_base.sc_detect = dwhdmi_phy_detect;
        sc->sc_base.sc_enable = rkdwhdmi_enable;
        sc->sc_base.sc_disable = dwhdmi_phy_disable;
        sc->sc_base.sc_mode_set = rkdwhdmi_mode_set;
        sc->sc_base.sc_mode_valid = rkdwhdmi_mode_valid;
        sc->sc_base.sc_mpll_config = rkdwhdmi_mpll_config;
        sc->sc_base.sc_phy_config = rkdwhdmi_phy_config;

        if (dwhdmi_attach(&sc->sc_base) != 0) {
                printf("%s: failed to attach driver\n", self->dv_xname);
                return;
        }

        sc->sc_ports.dp_node = faa->fa_node;
        sc->sc_ports.dp_cookie = sc;
        sc->sc_ports.dp_ep_activate = rkdwhdmi_ep_activate;
        sc->sc_ports.dp_ep_get_cookie = rkdwhdmi_ep_get_cookie;
        device_ports_register(&sc->sc_ports, EP_DRM_ENCODER);

#ifdef notyet
        fdtbus_register_dai_controller(self, phandle, &rkdwhdmi_dai_funcs);
#endif
}

void
rkdwhdmi_select_input(struct rkdwhdmi_softc *sc, u_int crtc_index)
{
        const uint32_t write_mask = HDMI_LCDC_SEL << 16;
        const uint32_t write_val = crtc_index == 0 ? HDMI_LCDC_SEL : 0;

        regmap_write_4(sc->sc_grf, RK3399_GRF_SOC_CON20, write_mask | write_val);
}

void
rkdwhdmi_encoder_enable(struct drm_encoder *encoder)
{
        struct rkdwhdmi_softc * const sc = to_rkdwhdmi_encoder(encoder);
        const u_int crtc_index = drm_crtc_index(encoder->crtc);

        rkdwhdmi_select_input(sc, crtc_index);
}

struct drm_encoder_funcs rkdwhdmi_encoder_funcs = {
        .destroy = drm_encoder_cleanup,
};

struct drm_encoder_helper_funcs rkdwhdmi_encoder_helper_funcs = {
        .enable = rkdwhdmi_encoder_enable,
};

int
rkdwhdmi_ep_activate(void *cookie, struct endpoint *ep, void *arg)
{
        struct rkdwhdmi_softc *sc = cookie;
        struct drm_crtc *crtc = NULL;
        struct endpoint *rep;
        int error;

        if (sc->sc_activated)
                return 0;

        rep = endpoint_remote(ep);
        if (rep && rep->ep_type == EP_DRM_CRTC)
                crtc = endpoint_get_cookie(rep);
        if (crtc == NULL)
                return EINVAL;

        sc->sc_encoder.possible_crtcs = 0x3; /* XXX */
        drm_encoder_init(crtc->dev, &sc->sc_encoder, &rkdwhdmi_encoder_funcs,
            DRM_MODE_ENCODER_TMDS, NULL);
        drm_encoder_helper_add(&sc->sc_encoder, &rkdwhdmi_encoder_helper_funcs);

        sc->sc_base.sc_connector.base.connector_type = DRM_MODE_CONNECTOR_HDMIA;
        error = dwhdmi_bind(&sc->sc_base, &sc->sc_encoder);
        if (error != 0)
                return error;

        sc->sc_activated = 1;
        return 0;
}

void *
rkdwhdmi_ep_get_cookie(void *cookie, struct endpoint *ep)
{
        struct rkdwhdmi_softc *sc = cookie;
        return &sc->sc_encoder;
}

void
rkdwhdmi_enable(struct dwhdmi_softc *dsc)
{
        dwhdmi_phy_enable(dsc);
}

void
rkdwhdmi_mode_set(struct dwhdmi_softc *dsc,
    const struct drm_display_mode *mode, const struct drm_display_mode *adjusted_mode)
{
        struct rkdwhdmi_softc *sc = to_rkdwhdmi_softc(dsc);
        int error;

        if (sc->sc_clk_vpll != -1) {
                error = clock_set_frequency(sc->sc_node, "vpll",
                    adjusted_mode->clock * 1000);
                if (error != 0)
                        printf("%s: couldn't set pixel clock to %u Hz: %d\n",
                            dsc->sc_dev.dv_xname, adjusted_mode->clock * 1000,
                            error);
        }

        dwhdmi_phy_mode_set(dsc, mode, adjusted_mode);
}

enum drm_mode_status
rkdwhdmi_mode_valid(struct dwhdmi_softc *dsc, const struct drm_display_mode *mode)
{
        struct rkdwhdmi_softc *sc = to_rkdwhdmi_softc(dsc);
        int i;

        for (i = 0; sc->sc_base.sc_mpll_config[i].pixel_clock != 0; i++)
                if (mode->clock == sc->sc_base.sc_mpll_config[i].pixel_clock)
                        return MODE_OK;

        return MODE_BAD;
}

#ifdef notyet

static audio_dai_tag_t
rkdwhdmi_dai_get_tag(device_t dev, const void *data, size_t len)
{
        struct rkdwhdmi_softc * const sc = device_private(dev);

        if (len != 4)
                return NULL;

        return &sc->sc_base.sc_dai;
}

static struct fdtbus_dai_controller_func rkdwhdmi_dai_funcs = {
        .get_tag = rkdwhdmi_dai_get_tag
};

#endif