// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2015 Google, Inc
 */

#include <common.h>
#include <console.h>
#include <cpu_func.h>
#include <dm.h>
#include <log.h>
#include <malloc.h>
#include <mapmem.h>
#include <stdio_dev.h>
#include <video.h>
#include <video_console.h>
#include <asm/cache.h>
#include <dm/lists.h>
#include <dm/device_compat.h>
#include <dm/device-internal.h>
#include <dm/uclass-internal.h>
#ifdef CONFIG_SANDBOX
#include <asm/sdl.h>
#endif

/*
 * Theory of operation:
 *
 * Before relocation each device is bound. The driver for each device must
 * set the @align and @size values in struct video_uc_platdata. This
 * information represents the requires size and alignment of the frame buffer
 * for the device. The values can be an over-estimate but cannot be too
 * small. The actual values will be suppled (in the same manner) by the bind()
 * method after relocation.
 *
 * This information is then picked up by video_reserve() which works out how
 * much memory is needed for all devices. This is allocated between
 * gd->video_bottom and gd->video_top.
 *
 * After relocation the same process occurs. The driver supplies the same
 * @size and @align information and this time video_post_bind() checks that
 * the drivers does not overflow the allocated memory.
 *
 * The frame buffer address is actually set (to plat->base) in
 * video_post_probe(). This function also clears the frame buffer and
 * allocates a suitable text console device. This can then be used to write
 * text to the video device.
 */
DECLARE_GLOBAL_DATA_PTR;

/**
 * struct video_uc_priv - Information for the video uclass
 *
 * @video_ptr: Current allocation position of the video framebuffer pointer.
 *      While binding devices after relocation, this points to the next
 *      available address to use for a device's framebuffer. It starts at
 *      gd->video_top and works downwards, running out of space when it hits
 *      gd->video_bottom.
 */
struct video_uc_priv {
        ulong video_ptr;
};

void video_set_flush_dcache(struct udevice *dev, bool flush)
{
        struct video_priv *priv = dev_get_uclass_priv(dev);

        priv->flush_dcache = flush;
}

static ulong alloc_fb(struct udevice *dev, ulong *addrp)
{
        struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);
        ulong base, align, size;

        if (!plat->size)
                return 0;

        align = plat->align ? plat->align : 1 << 20;
        base = *addrp - plat->size;
        base &= ~(align - 1);
        plat->base = base;
        size = *addrp - base;
        *addrp = base;

        return size;
}

int video_reserve(ulong *addrp)
{
        struct udevice *dev;
        ulong size;

        gd->video_top = *addrp;
        for (uclass_find_first_device(UCLASS_VIDEO, &dev);
             dev;
             uclass_find_next_device(&dev)) {
                size = alloc_fb(dev, addrp);
                debug("%s: Reserving %lx bytes at %lx for video device '%s'\n",
                      __func__, size, *addrp, dev->name);
        }

        /* Allocate space for PCI video devices in case there were not bound */
        if (*addrp == gd->video_top)
                *addrp -= CONFIG_VIDEO_PCI_DEFAULT_FB_SIZE;

        gd->video_bottom = *addrp;
        gd->fb_base = *addrp;
        debug("Video frame buffers from %lx to %lx\n", gd->video_bottom,
              gd->video_top);

        return 0;
}

int video_clear(struct udevice *dev)
{
        struct video_priv *priv = dev_get_uclass_priv(dev);
        int ret;

        switch (priv->bpix) {
        case VIDEO_BPP16:
                if (IS_ENABLED(CONFIG_VIDEO_BPP16)) {
                        u16 *ppix = priv->fb;
                        u16 *end = priv->fb + priv->fb_size;

                        while (ppix < end)
                                *ppix++ = priv->colour_bg;
                        break;
                }
        case VIDEO_BPP32:
                if (IS_ENABLED(CONFIG_VIDEO_BPP32)) {
                        u32 *ppix = priv->fb;
                        u32 *end = priv->fb + priv->fb_size;

                        while (ppix < end)
                                *ppix++ = priv->colour_bg;
                        break;
                }
        default:
                memset(priv->fb, priv->colour_bg, priv->fb_size);
                break;
        }
        ret = video_sync_copy(dev, priv->fb, priv->fb + priv->fb_size);
        if (ret)
                return ret;

        return video_sync(dev, false);
}

void video_set_default_colors(struct udevice *dev, bool invert)
{
        struct video_priv *priv = dev_get_uclass_priv(dev);
        int fore, back;

        if (CONFIG_IS_ENABLED(SYS_WHITE_ON_BLACK)) {
                /* White is used when switching to bold, use light gray here */
                fore = VID_LIGHT_GRAY;
                back = VID_BLACK;
        } else {
                fore = VID_BLACK;
                back = VID_WHITE;
        }
        if (invert) {
                int temp;

                temp = fore;
                fore = back;
                back = temp;
        }
        priv->fg_col_idx = fore;
        priv->bg_col_idx = back;
        priv->colour_fg = vid_console_color(priv, fore);
        priv->colour_bg = vid_console_color(priv, back);
}

/* Flush video activity to the caches */
int video_sync(struct udevice *vid, bool force)
{
        struct video_ops *ops = video_get_ops(vid);
        int ret;

        if (ops && ops->video_sync) {
                ret = ops->video_sync(vid);
                if (ret)
                        return ret;
        }

        /*
         * flush_dcache_range() is declared in common.h but it seems that some
         * architectures do not actually implement it. Is there a way to find
         * out whether it exists? For now, ARM is safe.
         */
#if defined(CONFIG_ARM) && !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
        struct video_priv *priv = dev_get_uclass_priv(vid);

        if (priv->flush_dcache) {
                flush_dcache_range((ulong)priv->fb,
                                   ALIGN((ulong)priv->fb + priv->fb_size,
                                         CONFIG_SYS_CACHELINE_SIZE));
        }
#elif defined(CONFIG_VIDEO_SANDBOX_SDL)
        struct video_priv *priv = dev_get_uclass_priv(vid);
        static ulong last_sync;

        if (force || get_timer(last_sync) > 10) {
                sandbox_sdl_sync(priv->fb);
                last_sync = get_timer(0);
        }
#endif
        return 0;
}

void video_sync_all(void)
{
        struct udevice *dev;
        int ret;

        for (uclass_find_first_device(UCLASS_VIDEO, &dev);
             dev;
             uclass_find_next_device(&dev)) {
                if (device_active(dev)) {
                        ret = video_sync(dev, true);
                        if (ret)
                                dev_dbg(dev, "Video sync failed\n");
                }
        }
}

int video_get_xsize(struct udevice *dev)
{
        struct video_priv *priv = dev_get_uclass_priv(dev);

        return priv->xsize;
}

int video_get_ysize(struct udevice *dev)
{
        struct video_priv *priv = dev_get_uclass_priv(dev);

        return priv->ysize;
}

#ifdef CONFIG_VIDEO_COPY
int video_sync_copy(struct udevice *dev, void *from, void *to)
{
        struct video_priv *priv = dev_get_uclass_priv(dev);

        if (priv->copy_fb) {
                long offset, size;

                /* Find the offset of the first byte to copy */
                if ((ulong)to > (ulong)from) {
                        size = to - from;
                        offset = from - priv->fb;
                } else {
                        size = from - to;
                        offset = to - priv->fb;
                }

                /*
                 * Allow a bit of leeway for valid requests somewhere near the
                 * frame buffer
                 */
                if (offset < -priv->fb_size || offset > 2 * priv->fb_size) {
#ifdef DEBUG
                        char str[80];

                        snprintf(str, sizeof(str),
                                 "[sync_copy fb=%p, from=%p, to=%p, offset=%lx]",
                                 priv->fb, from, to, offset);
                        console_puts_select_stderr(true, str);
#endif
                        return -EFAULT;
                }

                /*
                 * Silently crop the memcpy. This allows callers to avoid doing
                 * this themselves. It is common for the end pointer to go a
                 * few lines after the end of the frame buffer, since most of
                 * the update algorithms terminate a line after their last write
                 */
                if (offset + size > priv->fb_size) {
                        size = priv->fb_size - offset;
                } else if (offset < 0) {
                        size += offset;
                        offset = 0;
                }

                memcpy(priv->copy_fb + offset, priv->fb + offset, size);
        }

        return 0;
}
#endif

/* Set up the colour map */
static int video_pre_probe(struct udevice *dev)
{
        struct video_priv *priv = dev_get_uclass_priv(dev);

        priv->cmap = calloc(256, sizeof(ushort));
        if (!priv->cmap)
                return -ENOMEM;

        return 0;
}

static int video_pre_remove(struct udevice *dev)
{
        struct video_priv *priv = dev_get_uclass_priv(dev);

        free(priv->cmap);

        return 0;
}

/* Set up the display ready for use */
static int video_post_probe(struct udevice *dev)
{
        struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);
        struct video_priv *priv = dev_get_uclass_priv(dev);
        char name[30], drv[15], *str;
        const char *drv_name = drv;
        struct udevice *cons;
        int ret;

        /* Set up the line and display size */
        priv->fb = map_sysmem(plat->base, plat->size);
        if (!priv->line_length)
                priv->line_length = priv->xsize * VNBYTES(priv->bpix);

        priv->fb_size = priv->line_length * priv->ysize;

        if (IS_ENABLED(CONFIG_VIDEO_COPY) && plat->copy_base)
                priv->copy_fb = map_sysmem(plat->copy_base, plat->size);

        /* Set up colors  */
        video_set_default_colors(dev, false);

        if (!CONFIG_IS_ENABLED(NO_FB_CLEAR))
                video_clear(dev);

        /*
         * Create a text console device. For now we always do this, although
         * it might be useful to support only bitmap drawing on the device
         * for boards that don't need to display text. We create a TrueType
         * console if enabled, a rotated console if the video driver requests
         * it, otherwise a normal console.
         *
         * The console can be override by setting vidconsole_drv_name before
         * probing this video driver, or in the probe() method.
         *
         * TrueType does not support rotation at present so fall back to the
         * rotated console in that case.
         */
        if (!priv->rot && IS_ENABLED(CONFIG_CONSOLE_TRUETYPE)) {
                snprintf(name, sizeof(name), "%s.vidconsole_tt", dev->name);
                strcpy(drv, "vidconsole_tt");
        } else {
                snprintf(name, sizeof(name), "%s.vidconsole%d", dev->name,
                         priv->rot);
                snprintf(drv, sizeof(drv), "vidconsole%d", priv->rot);
        }

        str = strdup(name);
        if (!str)
                return -ENOMEM;
        if (priv->vidconsole_drv_name)
                drv_name = priv->vidconsole_drv_name;
        ret = device_bind_driver(dev, drv_name, str, &cons);
        if (ret) {
                debug("%s: Cannot bind console driver\n", __func__);
                return ret;
        }

        ret = device_probe(cons);
        if (ret) {
                debug("%s: Cannot probe console driver\n", __func__);
                return ret;
        }

        return 0;
};

/* Post-relocation, allocate memory for the frame buffer */
static int video_post_bind(struct udevice *dev)
{
        struct video_uc_priv *uc_priv;
        ulong addr;
        ulong size;

        /* Before relocation there is nothing to do here */
        if (!(gd->flags & GD_FLG_RELOC))
                return 0;

        /* Set up the video pointer, if this is the first device */
        uc_priv = dev->uclass->priv;
        if (!uc_priv->video_ptr)
                uc_priv->video_ptr = gd->video_top;

        /* Allocate framebuffer space for this device */
        addr = uc_priv->video_ptr;
        size = alloc_fb(dev, &addr);
        if (addr < gd->video_bottom) {
                /* Device tree node may need the 'u-boot,dm-pre-reloc' or
                 * 'u-boot,dm-pre-proper' tag
                 */
                printf("Video device '%s' cannot allocate frame buffer memory -ensure the device is set up before relocation\n",
                       dev->name);
                return -ENOSPC;
        }
        debug("%s: Claiming %lx bytes at %lx for video device '%s'\n",
              __func__, size, addr, dev->name);
        uc_priv->video_ptr = addr;

        return 0;
}

UCLASS_DRIVER(video) = {
        .id             = UCLASS_VIDEO,
        .name           = "video",
        .flags          = DM_UC_FLAG_SEQ_ALIAS,
        .post_bind      = video_post_bind,
        .pre_probe      = video_pre_probe,
        .post_probe     = video_post_probe,
        .pre_remove     = video_pre_remove,
        .priv_auto_alloc_size   = sizeof(struct video_uc_priv),
        .per_device_auto_alloc_size     = sizeof(struct video_priv),
        .per_device_platdata_auto_alloc_size = sizeof(struct video_uc_platdata),
};