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/*

 * Copyright (c) 2008 Martin Decky

 * Copyright (c) 2006 Ondrej Palkovsky

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - 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.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * 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.

 */

/** @addtogroup genarch

 * @{

 */

/** @file

 */

#include <genarch/fb/font-8x16.h>

#include <genarch/fb/visuals.h>

#include <genarch/fb/fb.h>

#include <console/chardev.h>

#include <console/console.h>

#include <sysinfo/sysinfo.h>

#include <mm/slab.h>

#include <align.h>

#include <panic.h>

#include <memstr.h>

#include <config.h>

#include <bitops.h>

#include <print.h>

#include <ddi/ddi.h>

#include <arch/types.h>

SPINLOCK_INITIALIZE(fb_lock);

/**< Physical memory area for fb. */

static parea_t fb_parea;

static uint8_t *fb_addr;

static uint8_t *backbuf;

static uint8_t *glyphs;

static void *bgpixel;

static unsigned int xres;

static unsigned int yres;

static unsigned int scanline;

static unsigned int glyphscanline;

static unsigned int pixelbytes;

static unsigned int glyphbytes;

static unsigned int cols;

static unsigned int rows;

static unsigned int position = 0;

#define BG_COLOR     0x000080

#define FG_COLOR     0xffff00

#define CURSOR       219

#define RED(x, bits)         ((x >> (8 + 8 + 8 - bits)) & ((1 << bits) - 1))

#define GREEN(x, bits)       ((x >> (8 + 8 - bits)) & ((1 << bits) - 1))

#define BLUE(x, bits)        ((x >> (8 - bits)) & ((1 << bits) - 1))

#define COL2X(col)           ((col) * FONT_WIDTH)

#define ROW2Y(row)           ((row) * FONT_SCANLINES)

#define X2COL(x)             ((x) / FONT_WIDTH)

#define Y2ROW(y)             ((y) / FONT_SCANLINES)

#define FB_POS(x, y)         ((y) * scanline + (x) * pixelbytes)

#define BB_POS(col, row)     ((row) * cols + (col))

#define GLYPH_POS(glyph, y)  ((glyph) * glyphbytes + (y) * glyphscanline)

static void (*rgb_conv)(void *, uint32_t);

/** ARGB 8:8:8:8 conversion

 *

 */

static void rgb_0888(void *dst, uint32_t rgb)

{

    *((uint32_t *) dst) = rgb & 0xffffff;

}

/** ABGR 8:8:8:8 conversion

 *

 */

static void bgr_0888(void *dst, uint32_t rgb)

{

    *((uint32_t *) dst)

        = (BLUE(rgb, 8) << 16) | (GREEN(rgb, 8) << 8) | RED(rgb, 8);

}

/** BGR 8:8:8 conversion

 *

 */

static void rgb_888(void *dst, uint32_t rgb)

{

#if defined(FB_INVERT_ENDIAN)

    *((uint32_t *) dst)

        = (BLUE(rgb, 8) << 16) | (GREEN(rgb, 8) << 8) | RED(rgb, 8)

        | (*((uint32_t *) dst) & 0xff0000);

#else

    *((uint32_t *) dst)

        = (rgb & 0xffffff) | (*((uint32_t *) dst) & 0xff0000);

#endif

}

/** RGB 5:5:5 conversion

 *

 */

static void rgb_555(void *dst, uint32_t rgb)

{

    *((uint16_t *) dst)

        = (RED(rgb, 5) << 10) | (GREEN(rgb, 5) << 5) | BLUE(rgb, 5);

}

/** RGB 5:6:5 conversion

 *

 */

static void rgb_565(void *dst, uint32_t rgb)

{

    *((uint16_t *) dst)

        = (RED(rgb, 5) << 11) | (GREEN(rgb, 6) << 5) | BLUE(rgb, 5);

}

/** RGB 3:2:3

 *

 * Even though we try 3:2:3 color scheme here, an 8-bit framebuffer

 * will most likely use a color palette. The color appearance

 * will be pretty random and depend on the default installed

 * palette. This could be fixed by supporting custom palette

 * and setting it to simulate the 8-bit truecolor.

 *

 * Currently we set the palette on the ia32, amd64 and sparc64 port.

 *

 * Note that the byte is being inverted by this function. The reason is

 * that we would like to use a color palette where the white color code

 * is 0 and the black color code is 255, as some machines (Sun Blade 1500)

 * use these codes for black and white and prevent to set codes

 * 0 and 255 to other colors.

 *

 */

static void rgb_323(void *dst, uint32_t rgb)

{

    *((uint8_t *) dst)

        = ~((RED(rgb, 3) << 5) | (GREEN(rgb, 2) << 3) | BLUE(rgb, 3));

}

/** Draw character at given position

 *

 */

static void draw_glyph(uint8_t glyph, unsigned int col, unsigned int row)

{

    unsigned int x = COL2X(col);

    unsigned int y = ROW2Y(row);

    unsigned int yd;

    backbuf[BB_POS(col, row)] = glyph;

    for (yd = 0; yd < FONT_SCANLINES; yd++)

        memcpy(&fb_addr[FB_POS(x, y + yd)],

            &glyphs[GLYPH_POS(glyph, yd)], glyphscanline);

}

/** Scroll screen down by one row

 *

 *

 */

static void scroll_screen(void)

{

    unsigned int row;

    for (row = 0; row < rows; row++) {

        unsigned int y = ROW2Y(row);

        unsigned int yd;

        for (yd = 0; yd < FONT_SCANLINES; yd++) {

            unsigned int x;

            unsigned int col;

            for (col = 0, x = 0; col < cols; col++, x += FONT_WIDTH) {

                uint8_t glyph;

                if (row < rows - 1) {

                    if (backbuf[BB_POS(col, row)] == backbuf[BB_POS(col, row + 1)])

                        continue;

                    glyph = backbuf[BB_POS(col, row + 1)];

                } else

                    glyph = 0;

                memcpy(&fb_addr[FB_POS(x, y + yd)],

                    &glyphs[GLYPH_POS(glyph, yd)], glyphscanline);

            }

        }

    }

    memcpy(backbuf, backbuf + cols, cols * (rows - 1));

    memsetb(&backbuf[BB_POS(0, rows - 1)], cols, 0);

}

static void cursor_put(void)

{

    draw_glyph(CURSOR, position % cols, position / cols);

}

static void cursor_remove(void)

{

    draw_glyph(0, position % cols, position / cols);

}

/** Print character to screen

 *

 * Emulate basic terminal commands.

 *

 */

static void fb_putchar(chardev_t *dev, char ch)

{

    spinlock_lock(&fb_lock);

    switch (ch) {

    case '\n':

        cursor_remove();

        position += cols;

        position -= position % cols;

        break;

    case '\r':

        cursor_remove();

        position -= position % cols;

        break;

    case '\b':

        cursor_remove();

        if (position % cols)

            position--;

        break;

    case '\t':

        cursor_remove();

        do {

            draw_glyph((uint8_t) ' ', position % cols, position / cols);

            position++;

        } while ((position % 8) && (position < cols * rows));

        break;

    default:

        draw_glyph((uint8_t) ch, position % cols, position / cols);

        position++;

    }

    if (position >= cols * rows) {

        position -= cols;

        scroll_screen();

    }

    cursor_put();

    spinlock_unlock(&fb_lock);

}

static chardev_t framebuffer;

static chardev_operations_t fb_ops = {

    .write = fb_putchar,

};

/** Render glyphs

 *

 * Convert glyphs from device independent font

 * description to current visual representation.

 *

 */

static void render_glyphs(void)

{

    unsigned int glyph;

    for (glyph = 0; glyph < FONT_GLYPHS; glyph++) {

        unsigned int y;

        for (y = 0; y < FONT_SCANLINES; y++) {

            unsigned int x;

            for (x = 0; x < FONT_WIDTH; x++)

                rgb_conv(&glyphs[GLYPH_POS(glyph, y) + x * pixelbytes],

                    (fb_font[glyph * FONT_SCANLINES + y] & (1 << (7 - x))) ? FG_COLOR : BG_COLOR);

        }

    }

    rgb_conv(bgpixel, BG_COLOR);

}

/** Refresh the screen

 *

 */

void fb_redraw(void)

{

    unsigned int row;

    for (row = 0; row < rows; row++) {

        unsigned int y = ROW2Y(row);

        unsigned int yd;

        for (yd = 0; yd < FONT_SCANLINES; yd++) {

            unsigned int x;

            unsigned int col;

            for (col = 0, x = 0; col < cols; col++, x += FONT_WIDTH)

                memcpy(&fb_addr[FB_POS(x, y + yd)],

                &glyphs[GLYPH_POS(backbuf[BB_POS(col, row)], yd)],

                glyphscanline);

        }

    }

    if (COL2X(cols) < xres) {

        unsigned int y;

        for (y = 0; y < yres; y++) {

            unsigned int x;

            for (x = COL2X(cols); x < xres; x++)

                memcpy(&fb_addr[FB_POS(x, y)], bgpixel, pixelbytes);

        }

    }

    if (ROW2Y(rows) < yres) {

        unsigned int y;

        for (y = ROW2Y(rows); y < yres; y++) {

            unsigned int x;

            for (x = 0; x < xres; x++)

                memcpy(&fb_addr[FB_POS(x, y)], bgpixel, pixelbytes);

        }

    }

}

/** Initialize framebuffer as a chardev output device

 *

 * @param addr   Physical address of the framebuffer

 * @param x      Screen width in pixels

 * @param y      Screen height in pixels

 * @param scan   Bytes per one scanline

 * @param visual Color model

 *

 */

void fb_init(fb_properties_t *props)

{

    switch (props->visual) {

    case VISUAL_INDIRECT_8:

        rgb_conv = rgb_323;

        pixelbytes = 1;

        break;

    case VISUAL_RGB_5_5_5:

        rgb_conv = rgb_555;

        pixelbytes = 2;

        break;

    case VISUAL_RGB_5_6_5:

        rgb_conv = rgb_565;

        pixelbytes = 2;

        break;

    case VISUAL_RGB_8_8_8:

        rgb_conv = rgb_888;

        pixelbytes = 3;

        break;

    case VISUAL_RGB_8_8_8_0:

        rgb_conv = rgb_888;

        pixelbytes = 4;

        break;

    case VISUAL_RGB_0_8_8_8:

        rgb_conv = rgb_0888;

        pixelbytes = 4;

        break;

    case VISUAL_BGR_0_8_8_8:

        rgb_conv = bgr_0888;

        pixelbytes = 4;

        break;

    default:

        panic("Unsupported visual.\n");

    }

    xres = props->x;

    yres = props->y;

    scanline = props->scan;

    cols = xres / FONT_WIDTH;

    rows = yres / FONT_SCANLINES;

    glyphscanline = FONT_WIDTH * pixelbytes;

    glyphbytes = glyphscanline * FONT_SCANLINES;

    unsigned int fbsize = scanline * yres;

    unsigned int bbsize = cols * rows;

    unsigned int glyphsize = FONT_GLYPHS * glyphbytes;

    backbuf = (uint8_t *) malloc(bbsize, 0);

    if (!backbuf)

        panic("Unable to allocate backbuffer.\n");

    glyphs = (uint8_t *) malloc(glyphsize, 0);

    if (!glyphs)

        panic("Unable to allocate glyphs.\n");

    bgpixel = malloc(pixelbytes, 0);

    if (!bgpixel)

        panic("Unable to allocate background pixel.\n");

    memsetb(backbuf, bbsize, 0);

    memsetb(glyphs, glyphsize, 0);

    memsetb(bgpixel, pixelbytes, 0);

    render_glyphs();

    fb_addr = (uint8_t *) hw_map((uintptr_t) props->addr, fbsize);

    fb_parea.pbase = (uintptr_t) props->addr + props->offset;

    fb_parea.vbase = (uintptr_t) fb_addr;

    fb_parea.frames = SIZE2FRAMES(fbsize);

    fb_parea.cacheable = false;

    ddi_parea_register(&fb_parea);

    sysinfo_set_item_val("fb", NULL, true);

    sysinfo_set_item_val("fb.kind", NULL, 1);

    sysinfo_set_item_val("fb.width", NULL, xres);

    sysinfo_set_item_val("fb.height", NULL, yres);

    sysinfo_set_item_val("fb.scanline", NULL, scanline);

    sysinfo_set_item_val("fb.visual", NULL, props->visual);

    sysinfo_set_item_val("fb.address.physical", NULL, props->addr);

    fb_redraw();

    chardev_initialize("fb", &framebuffer, &fb_ops);

    stdout = &framebuffer;

}

/** @}

 */