/* $NetBSD: sunxi_dwhdmi.c,v 1.12 2025/10/13 14:12:13 thorpej 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sunxi_dwhdmi.c,v 1.12 2025/10/13 14:12:13 thorpej Exp $");

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

#include <dev/fdt/fdt_port.h>
#include <dev/fdt/fdtvar.h>

#include <dev/ic/dw_hdmi.h>

#include <arm/sunxi/sunxi_hdmiphy.h>

#include <drm/drm_drv.h>

enum {
        DWHDMI_PORT_INPUT = 0,
        DWHDMI_PORT_OUTPUT = 1,
};

static const struct device_compatible_entry compat_data[] = {
        { .compat = "allwinner,sun8i-h3-dw-hdmi" },
        { .compat = "allwinner,sun50i-a64-dw-hdmi" },
        DEVICE_COMPAT_EOL
};

struct sunxi_dwhdmi_softc {
        struct dwhdmi_softc     sc_base;
        int                     sc_phandle;
        struct fdtbus_phy       *sc_phy;
        struct fdtbus_regulator *sc_regulator;
        struct clk              *sc_clk;

        struct fdt_device_ports sc_ports;
        struct drm_display_mode sc_curmode;
};

#define to_sunxi_dwhdmi_softc(x)        container_of(x, struct sunxi_dwhdmi_softc, sc_base)

static int
sunxi_dwhdmi_ep_activate(device_t dev, struct fdt_endpoint *ep, bool activate)
{
        struct sunxi_dwhdmi_softc * const sc = device_private(dev);
        struct fdt_endpoint *in_ep = fdt_endpoint_remote(ep);
        struct fdt_endpoint *out_ep, *out_rep;
        struct drm_encoder *encoder;
        struct drm_bridge *bridge;
        int error;

        if (!activate)
                return EINVAL;

        if (fdt_endpoint_port_index(ep) != DWHDMI_PORT_INPUT)
                return EINVAL;

        switch (fdt_endpoint_type(in_ep)) {
        case EP_DRM_ENCODER:
                encoder = fdt_endpoint_get_data(in_ep);
                break;
        case EP_DRM_BRIDGE:
                bridge = fdt_endpoint_get_data(in_ep);
                encoder = bridge->encoder;
                break;
        default:
                encoder = NULL;
                break;
        }

        if (encoder == NULL)
                return EINVAL;

        if (sc->sc_regulator != NULL) {
                error = fdtbus_regulator_enable(sc->sc_regulator);
                if (error != 0) {
                        device_printf(dev, "couldn't enable supply\n");
                        return error;
                }
        }

        error = dwhdmi_bind(&sc->sc_base, encoder);
        if (error != 0)
                return error;

        out_ep = fdt_endpoint_get_from_index(&sc->sc_ports, DWHDMI_PORT_OUTPUT, 0);
        if (out_ep != NULL) {
                /* Ignore downstream connectors, we have our own. */
                out_rep = fdt_endpoint_remote(out_ep);
                if (out_rep != NULL && fdt_endpoint_type(out_rep) == EP_DRM_CONNECTOR)
                        return 0;

                error = fdt_endpoint_activate(out_ep, activate);
                if (error != 0)
                        return error;
        }

        return 0;
}

static void *
sunxi_dwhdmi_ep_get_data(device_t dev, struct fdt_endpoint *ep)
{
        struct sunxi_dwhdmi_softc * const sc = device_private(dev);

        return &sc->sc_base.sc_bridge;
}

static enum drm_connector_status
sunxi_dwhdmi_detect(struct dwhdmi_softc *dsc, bool force)
{
        struct sunxi_dwhdmi_softc * const sc = to_sunxi_dwhdmi_softc(dsc);

        KASSERT(sc->sc_phy != NULL);

        if (sunxi_hdmiphy_detect(sc->sc_phy, force))
                return connector_status_connected;
        else
                return connector_status_disconnected;
}

static void
sunxi_dwhdmi_enable(struct dwhdmi_softc *dsc)
{
        struct sunxi_dwhdmi_softc * const sc = to_sunxi_dwhdmi_softc(dsc);
        int error;

        KASSERT(sc->sc_phy != NULL);

        error = fdtbus_phy_enable(sc->sc_phy, true);
        if (error != 0) {
                device_printf(dsc->sc_dev, "failed to enable phy: %d\n", error);
                return;
        }

        error = sunxi_hdmiphy_config(sc->sc_phy, &sc->sc_curmode);
        if (error != 0)
                device_printf(dsc->sc_dev, "failed to configure phy: %d\n", error);
}

static void
sunxi_dwhdmi_disable(struct dwhdmi_softc *dsc)
{
        struct sunxi_dwhdmi_softc * const sc = to_sunxi_dwhdmi_softc(dsc);
        int error;

        KASSERT(sc->sc_phy != NULL);

        error = fdtbus_phy_enable(sc->sc_phy, false);
        if (error != 0)
                device_printf(dsc->sc_dev, "failed to disable phy\n");
}

static void
sunxi_dwhdmi_mode_set(struct dwhdmi_softc *dsc,
    const struct drm_display_mode *mode,
    const struct drm_display_mode *adjusted_mode)
{
        struct sunxi_dwhdmi_softc * const sc = to_sunxi_dwhdmi_softc(dsc);
        int error;

        if (sc->sc_clk != NULL) {
                error = clk_set_rate(sc->sc_clk, adjusted_mode->clock * 1000);
                if (error != 0)
                        device_printf(sc->sc_base.sc_dev,
                            "couldn't set pixel clock to %u Hz: %d\n",
                            adjusted_mode->clock * 1000, error);
        }

        sc->sc_curmode = *adjusted_mode;
}

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

        if (len != 4)
                return NULL;

        return &sc->sc_base.sc_dai;
}

static struct fdtbus_dai_controller_func sunxi_dwhdmi_dai_funcs = {
        .get_tag = sunxi_dwhdmi_dai_get_tag
};

static int
sunxi_dwhdmi_match(device_t parent, cfdata_t cf, void *aux)
{
        struct fdt_attach_args * const faa = aux;

        return of_compatible_match(faa->faa_phandle, compat_data);
}

static void
sunxi_dwhdmi_attach(device_t parent, device_t self, void *aux)
{
        struct sunxi_dwhdmi_softc * const sc = device_private(self);
        struct fdt_attach_args * const faa = aux;
        const int phandle = faa->faa_phandle;
        struct clk *clk_iahb, *clk_isfr, *clk_tmds;
        struct fdtbus_reset *rst;
        bus_addr_t addr;
        bus_size_t size;

        if (device_getprop_bool(self, "disabled")) {
                aprint_naive("\n");
                aprint_normal(": HDMI TX (disabled)\n");
                return;
        }

        if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
                aprint_error(": couldn't get registers\n");
                return;
        }

        clk_iahb = fdtbus_clock_get(phandle, "iahb");
        if (clk_iahb == NULL || clk_enable(clk_iahb) != 0) {
                aprint_error(": couldn't enable iahb clock\n");
                return;
        }

        clk_isfr = fdtbus_clock_get(phandle, "isfr");
        if (clk_isfr == NULL || clk_enable(clk_isfr) != 0) {
                aprint_error(": couldn't enable isfr clock\n");
                return;
        }

        clk_tmds = fdtbus_clock_get(phandle, "tmds");
        if (clk_tmds == NULL || clk_enable(clk_tmds) != 0) {
                aprint_error(": couldn't enable tmds clock\n");
                return;
        }

        sc->sc_base.sc_dev = self;
        sc->sc_base.sc_reg_width = 1;
        sc->sc_base.sc_bst = faa->faa_bst;
        if (bus_space_map(sc->sc_base.sc_bst, addr, size, 0, &sc->sc_base.sc_bsh) != 0) {
                aprint_error(": couldn't map registers\n");
                return;
        }
        sc->sc_base.sc_detect = sunxi_dwhdmi_detect;
        sc->sc_base.sc_enable = sunxi_dwhdmi_enable;
        sc->sc_base.sc_disable = sunxi_dwhdmi_disable;
        sc->sc_base.sc_mode_set = sunxi_dwhdmi_mode_set;
        sc->sc_base.sc_scl_hcnt = 0xd8;
        sc->sc_base.sc_scl_lcnt = 0xfe;
        sc->sc_phandle = faa->faa_phandle;
        sc->sc_clk = clk_tmds;

        aprint_naive("\n");
        aprint_normal(": HDMI TX\n");

        sc->sc_regulator = fdtbus_regulator_acquire(sc->sc_phandle, "hvcc-supply");

        sc->sc_phy = fdtbus_phy_get(sc->sc_phandle, "hdmi-phy");
        if (sc->sc_phy == NULL)
                sc->sc_phy = fdtbus_phy_get(sc->sc_phandle, "phy");
        if (sc->sc_phy == NULL) {
                device_printf(self, "couldn't find PHY\n");
                return;
        }

        rst = fdtbus_reset_get(phandle, "ctrl");
        if (rst == NULL || fdtbus_reset_deassert(rst) != 0) {
                aprint_error_dev(self, "couldn't de-assert reset\n");
                return;
        }

        sunxi_hdmiphy_init(sc->sc_phy);

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

        sc->sc_ports.dp_ep_activate = sunxi_dwhdmi_ep_activate;
        sc->sc_ports.dp_ep_get_data = sunxi_dwhdmi_ep_get_data;
        fdt_ports_register(&sc->sc_ports, self, phandle, EP_DRM_BRIDGE);

        fdtbus_register_dai_controller(self, phandle, &sunxi_dwhdmi_dai_funcs);
}

CFATTACH_DECL_NEW(sunxi_dwhdmi, sizeof(struct sunxi_dwhdmi_softc),
        sunxi_dwhdmi_match, sunxi_dwhdmi_attach, NULL, NULL);