/* $NetBSD: simplefb.c,v 1.17 2026/04/26 13:14:07 tsutsui Exp $ */

/*-
 * Copyright (c) 2017 Jared 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 "opt_wsdisplay_compat.h"

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: simplefb.c,v 1.17 2026/04/26 13:14:07 tsutsui Exp $");

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

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

#include <dev/wsfb/genfbvar.h>

static const struct device_compatible_entry compat_data[] = {
        { .compat = "simple-framebuffer" },
        DEVICE_COMPAT_EOL
};

struct simplefb_softc {
        struct genfb_softc sc_gen;
        bus_space_tag_t sc_bst;
        bus_space_handle_t sc_bsh;
        int sc_phandle;

        bus_addr_t sc_paddr;
};

static int simplefb_console_phandle = -1;

static bool
simplefb_shutdown(device_t self, int flags)
{
        genfb_enable_polling(self);
        return true;
}

static int
simplefb_ioctl(void *v, void *vs, u_long cmd, void *data, int flag, lwp_t *l)
{
        struct simplefb_softc * const sc = v;
        struct wsdisplayio_bus_id *busid;
        struct wsdisplayio_fbinfo *fbi;
        struct rasops_info *ri;
        u_int video;
        int error;

        switch (cmd) {
        case WSDISPLAYIO_GTYPE:
                *(u_int *)data = WSDISPLAY_TYPE_GENFB;
                return 0;
        case WSDISPLAYIO_GET_BUSID:
                busid = data;
                busid->bus_type = WSDISPLAYIO_BUS_SOC;
                return 0;
        case WSDISPLAYIO_GET_FBINFO:
                fbi = data;
                ri = &sc->sc_gen.vd.active->scr_ri;
                error = wsdisplayio_get_fbinfo(ri, fbi);
                if (error == 0) {
                        /*
                         * XXX
                         * if the fb isn't page aligned, tell wsfb to skip the
                         * unaligned part
                         */
                        fbi->fbi_fboffset = sc->sc_paddr & PAGE_MASK;
                        fbi->fbi_flags |= WSFB_VRAM_IS_RAM;
                }
                return error;
        case WSDISPLAYIO_SVIDEO:
                video = *(u_int *)data;
                if (video == WSDISPLAYIO_VIDEO_OFF)
                        pmf_event_inject(NULL, PMFE_DISPLAY_OFF);
                else if (video == WSDISPLAYIO_VIDEO_ON)
                        pmf_event_inject(NULL, PMFE_DISPLAY_ON);
                else
                        return EINVAL;
                return 0;
        default:
                return EPASSTHROUGH;
        }
}

static paddr_t
simplefb_mmap(void *v, void *vs, off_t off, int prot)
{
        struct simplefb_softc * const sc = v;

        if (off < 0 || off >= (sc->sc_paddr & PAGE_MASK) +
            sc->sc_gen.sc_fbsize)
                return -1;

        return bus_space_mmap(sc->sc_bst, trunc_page(sc->sc_paddr), off, prot,
            BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_PREFETCHABLE);
}

static int
simplefb_attach_genfb(struct simplefb_softc *sc)
{
        device_t dev = sc->sc_gen.sc_dev;
        prop_dictionary_t dict = device_properties(dev);
        const int phandle = sc->sc_phandle;
        struct genfb_ops ops;
        uint32_t width, height, stride;
        uint16_t depth;
        const char *format;
        uint64_t sfb_addr;
        bus_addr_t addr;
        bus_size_t size;

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

        if (size == 0) {
                aprint_naive("\n");
                aprint_normal(": disabled\n");
                return ENXIO;
        }

        if (of_getprop_uint32(phandle, "width", &width) != 0 ||
            of_getprop_uint32(phandle, "height", &height) != 0 ||
            of_getprop_uint32(phandle, "stride", &stride) != 0 ||
            (format = fdtbus_get_string(phandle, "format")) == NULL) {
                aprint_error(": missing property in DT\n");
                return ENXIO;
        }

        if (strcmp(format, "a8b8g8r8") == 0 ||
            strcmp(format, "x8r8g8b8") == 0 ||
            strcmp(format, "a8r8g8b8") == 0) {
                depth = 32;
        } else if (strcmp(format, "r8g8b8a8") == 0 ||
                   strcmp(format, "b8g8r8x8") == 0) {
                depth = 32;
                prop_dictionary_set_bool(dict, "is_swapped", true);
        } else if (strcmp(format, "x2r10g10b10") == 0) {
                depth = 32;
                prop_dictionary_set_bool(dict, "is_10bit", true);
        } else if (strcmp(format, "r5g6b5") == 0) {
                depth = 16;
        } else {
                aprint_error(": unsupported format '%s'\n", format);
                return ENXIO;
        }

        if (size < stride * height) {
                aprint_error(": incorrect size\n");
                return ENXIO;
        }

        /* Device may have been reconfigured. MD code will tell us. */
        if (prop_dictionary_get_uint64(dict, "simplefb-physaddr", &sfb_addr) &&
            sfb_addr != 0) {
                addr = (bus_addr_t)sfb_addr;
        }

        if (bus_space_map(sc->sc_bst, addr, size,
            BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_PREFETCHABLE,
            &sc->sc_bsh) != 0) {
                aprint_error(": failed to map fb\n");
                return ENXIO;
        }

        sc->sc_paddr = addr;

        prop_dictionary_set_uint32(dict, "width", width);
        prop_dictionary_set_uint32(dict, "height", height);
        prop_dictionary_set_uint8(dict, "depth", depth);
        prop_dictionary_set_uint16(dict, "linebytes", stride);
        prop_dictionary_set_uint32(dict, "address", addr);
        prop_dictionary_set_uint64(dict, "virtual_address",
            (uintptr_t)bus_space_vaddr(sc->sc_bst, sc->sc_bsh));

        genfb_init(&sc->sc_gen);

        if (sc->sc_gen.sc_width == 0 || sc->sc_gen.sc_fbsize == 0) {
                aprint_normal(": disabled\n");
                return ENXIO;
        }

        aprint_naive("\n");
        aprint_normal(": Simple Framebuffer (%ux%u %u-bpp @ 0x%" PRIxBUSADDR ")\n",
            width, height, depth, addr);

        pmf_device_register1(dev, NULL, NULL, simplefb_shutdown);

        memset(&ops, 0, sizeof(ops));
        ops.genfb_ioctl = simplefb_ioctl;
        ops.genfb_mmap = simplefb_mmap;

#ifdef WSDISPLAY_MULTICONS
        const bool is_console = true;
        genfb_cnattach();
#else
        const bool is_console = phandle == simplefb_console_phandle;
        if (is_console)
                aprint_normal_dev(sc->sc_gen.sc_dev,
                    "switching to framebuffer console\n");
#endif

        prop_dictionary_set_bool(dict, "is_console", is_console);

        genfb_attach(&sc->sc_gen, &ops);

        return 0;
}

static int
simplefb_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
simplefb_attach(device_t parent, device_t self, void *aux)
{
        struct simplefb_softc * const sc = device_private(self);
        struct fdt_attach_args * const faa = aux;
        const int phandle = faa->faa_phandle;

        sc->sc_gen.sc_dev = self;
        sc->sc_phandle = phandle;
        sc->sc_bst = faa->faa_bst;

        if (simplefb_attach_genfb(sc) != 0)
                return;
}

CFATTACH_DECL_NEW(simplefb, sizeof(struct simplefb_softc),
        simplefb_match, simplefb_attach, NULL, NULL);

static int
simplefb_console_match(int phandle)
{
        return of_compatible_match(phandle, compat_data);
}

static void
simplefb_console_consinit(struct fdt_attach_args *faa, u_int uart_freq)
{
        simplefb_console_phandle = faa->faa_phandle;
        genfb_cnattach();
}

static const struct fdt_console simplefb_fdt_console = {
        .match = simplefb_console_match,
        .consinit = simplefb_console_consinit
};

FDT_CONSOLE(simplefb, &simplefb_fdt_console);