/*

 * OMAP LCD controller.

 *

 * Copyright (C) 2006-2007 Andrzej Zaborowski  <balrog@zabor.org>

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License as

 * published by the Free Software Foundation; either version 2 of

 * the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,

 * MA 02111-1307 USA

 */

#include "hw.h"

#include "gui.h"

#include "omap.h"

struct omap_lcd_panel_s {

    qemu_irq irq;

    DisplayState *state;

    ram_addr_t imif_base;

    ram_addr_t emiff_base;

    int plm;

    int tft;

    int mono;

    int enable;

    int width;

    int height;

    int interrupts;

    uint32_t timing[3];

    uint32_t subpanel;

    uint32_t ctrl;

    struct omap_dma_lcd_channel_s *dma;

    uint16_t palette[256];

    int palette_done;

    int frame_done;

    int invalidate;

    int sync_error;

};

static void omap_lcd_interrupts(struct omap_lcd_panel_s *s)

{

    if (s->frame_done && (s->interrupts & 1)) {

        qemu_irq_raise(s->irq);

        return;

    }

    if (s->palette_done && (s->interrupts & 2)) {

        qemu_irq_raise(s->irq);

        return;

    }

    if (s->sync_error) {

        qemu_irq_raise(s->irq);

        return;

    }

    qemu_irq_lower(s->irq);

}

#include "pixel_ops.h"

typedef void draw_line_func(

                uint8_t *d, const uint8_t *s, int width, const uint16_t *pal);

#define DEPTH 8

#include "omap_lcd_template.h"

#define DEPTH 15

#include "omap_lcd_template.h"

#define DEPTH 16

#include "omap_lcd_template.h"

#define DEPTH 32

#include "omap_lcd_template.h"

static draw_line_func *draw_line_table2[33] = {

    [0 ... 32]	= 0,

    [8]		= draw_line2_8,

    [15]	= draw_line2_15,

    [16]	= draw_line2_16,

    [32]	= draw_line2_32,

}, *draw_line_table4[33] = {

    [0 ... 32]	= 0,

    [8]		= draw_line4_8,

    [15]	= draw_line4_15,

    [16]	= draw_line4_16,

    [32]	= draw_line4_32,

}, *draw_line_table8[33] = {

    [0 ... 32]	= 0,

    [8]		= draw_line8_8,

    [15]	= draw_line8_15,

    [16]	= draw_line8_16,

    [32]	= draw_line8_32,

}, *draw_line_table12[33] = {

    [0 ... 32]	= 0,

    [8]		= draw_line12_8,

    [15]	= draw_line12_15,

    [16]	= draw_line12_16,

    [32]	= draw_line12_32,

}, *draw_line_table16[33] = {

    [0 ... 32]	= 0,

    [8]		= draw_line16_8,

    [15]	= draw_line16_15,

    [16]	= draw_line16_16,

    [32]	= draw_line16_32,

};

static void omap_update_display(void *opaque)

{

    struct omap_lcd_panel_s *omap_lcd = (struct omap_lcd_panel_s *) opaque;

    draw_line_func *draw_line;

    int size, dirty[2], minline, maxline, height;

    int line, width, linesize, step, bpp, frame_offset;

    ram_addr_t frame_base, scanline, newline, x;

    uint8_t *s, *d;

    if (!omap_lcd || omap_lcd->plm == 1 ||

                    !omap_lcd->enable || !ds_get_bits_per_pixel(omap_lcd->state))

        return;

    frame_offset = 0;

    if (omap_lcd->plm != 2) {

        /* FIXME: This is broken if it spans multiple RAM regions.  */

        memcpy(omap_lcd->palette,

               host_ram_addr(omap_lcd->dma->phys_framebuffer[

                             omap_lcd->dma->current_frame]), 0x200);

        switch (omap_lcd->palette[0] >> 12 & 7) {

        case 3 ... 7:

            frame_offset += 0x200;

            break;

        default:

            frame_offset += 0x20;

        }

    }

    /* Colour depth */

    switch ((omap_lcd->palette[0] >> 12) & 7) {

    case 1:

        draw_line = draw_line_table2[ds_get_bits_per_pixel(omap_lcd->state)];

        bpp = 2;

        break;

    case 2:

        draw_line = draw_line_table4[ds_get_bits_per_pixel(omap_lcd->state)];

        bpp = 4;

        break;

    case 3:

        draw_line = draw_line_table8[ds_get_bits_per_pixel(omap_lcd->state)];

        bpp = 8;

        break;

    case 4 ... 7:

        if (!omap_lcd->tft)

            draw_line = draw_line_table12[ds_get_bits_per_pixel(omap_lcd->state)];

        else

            draw_line = draw_line_table16[ds_get_bits_per_pixel(omap_lcd->state)];

        bpp = 16;

        break;

    default:

        /* Unsupported at the moment.  */

        return;

    }

    /* Resolution */

    width = omap_lcd->width;

    if (width != ds_get_width(omap_lcd->state) ||

            omap_lcd->height != ds_get_height(omap_lcd->state)) {

        gui_resize_vt(omap_lcd->state,

                            omap_lcd->width, omap_lcd->height);

        omap_lcd->invalidate = 1;

    }

    if (omap_lcd->dma->current_frame == 0)

        size = omap_lcd->dma->src_f1_bottom - omap_lcd->dma->src_f1_top;

    else

        size = omap_lcd->dma->src_f2_bottom - omap_lcd->dma->src_f2_top;

    if (frame_offset + ((width * omap_lcd->height * bpp) >> 3) > size + 2) {

        omap_lcd->sync_error = 1;

        omap_lcd_interrupts(omap_lcd);

        omap_lcd->enable = 0;

        return;

    }

    /* Content */

    frame_base = omap_lcd->dma->phys_framebuffer[

            omap_lcd->dma->current_frame] + frame_offset;

    omap_lcd->dma->condition |= 1 << omap_lcd->dma->current_frame;

    if (omap_lcd->dma->interrupts & 1)

        qemu_irq_raise(omap_lcd->dma->irq);

    if (omap_lcd->dma->dual)

        omap_lcd->dma->current_frame ^= 1;

    if (!ds_get_bits_per_pixel(omap_lcd->state))

        return;

    line = 0;

    height = omap_lcd->height;

    if (omap_lcd->subpanel & (1 << 31)) {

        if (omap_lcd->subpanel & (1 << 29))

            line = (omap_lcd->subpanel >> 16) & 0x3ff;

        else

            height = (omap_lcd->subpanel >> 16) & 0x3ff;

        /* TODO: fill the rest of the panel with DPD */

    }

    step = width * bpp >> 3;

    scanline = frame_base + step * line;

    /* FIXME: This is broken if it spans multiple RAM regions.  */

    s = host_ram_addr(scanline);

    d = ds_get_data(omap_lcd->state);

    linesize = ds_get_linesize(omap_lcd->state);

    dirty[0] = dirty[1] =

            cpu_physical_memory_get_dirty(scanline, VGA_DIRTY_FLAG);

    minline = height;

    maxline = line;

    for (; line < height; line ++) {

        newline = scanline + step;

        for (x = scanline + TARGET_PAGE_SIZE; x < newline;

                        x += TARGET_PAGE_SIZE) {

            dirty[1] = cpu_physical_memory_get_dirty(x, VGA_DIRTY_FLAG);

            dirty[0] |= dirty[1];

        }

        if (dirty[0] || omap_lcd->invalidate) {

            draw_line(d, s, width, omap_lcd->palette);

            if (line < minline)

                minline = line;

            maxline = line + 1;

        }

        scanline = newline;

        dirty[0] = dirty[1];

        s += step;

        d += linesize;

    }

    if (maxline >= minline) {

        dpy_update(omap_lcd->state, 0, minline, width, maxline);

        cpu_physical_memory_reset_dirty(frame_base + step * minline,

                        frame_base + step * maxline, VGA_DIRTY_FLAG);

    }

}

static int ppm_save(const char *filename, uint8_t *data,

                int w, int h, int linesize)

{

    FILE *f;

    uint8_t *d, *d1;

    unsigned int v;

    int y, x, bpp;

    f = fopen(filename, "wb");

    if (!f)

        return -1;

    fprintf(f, "P6\n%d %d\n%d\n", w, h, 255);

    d1 = data;

    bpp = linesize / w;

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

        d = d1;

        for (x = 0; x < w; x ++) {

            v = *(uint32_t *) d;

            switch (bpp) {

            case 2:

                fputc((v >> 8) & 0xf8, f);

                fputc((v >> 3) & 0xfc, f);

                fputc((v << 3) & 0xf8, f);

                break;

            case 3:

            case 4:

            default:

                fputc((v >> 16) & 0xff, f);

                fputc((v >> 8) & 0xff, f);

                fputc((v) & 0xff, f);

                break;

            }

            d += bpp;

        }

        d1 += linesize;

    }

    fclose(f);

    return 0;

}

static void omap_screen_dump(void *opaque, const char *filename) {

    struct omap_lcd_panel_s *omap_lcd = opaque;

    omap_update_display(opaque);

    if (omap_lcd && ds_get_data(omap_lcd->state))

        ppm_save(filename, ds_get_data(omap_lcd->state),

                omap_lcd->width, omap_lcd->height,

                ds_get_linesize(omap_lcd->state));

}

static void omap_invalidate_display(void *opaque) {

    struct omap_lcd_panel_s *omap_lcd = opaque;

    omap_lcd->invalidate = 1;

}

static void omap_lcd_update(struct omap_lcd_panel_s *s) {

    if (!s->enable) {

        s->dma->current_frame = -1;

        s->sync_error = 0;

        if (s->plm != 1)

            s->frame_done = 1;

        omap_lcd_interrupts(s);

        return;

    }

    if (s->dma->current_frame == -1) {

        s->frame_done = 0;

        s->palette_done = 0;

        s->dma->current_frame = 0;

    }

    if (!s->dma->mpu->port[s->dma->src].addr_valid(s->dma->mpu,

                            s->dma->src_f1_top) ||

                    !s->dma->mpu->port[

                    s->dma->src].addr_valid(s->dma->mpu,

                            s->dma->src_f1_bottom) ||

                    (s->dma->dual &&

                     (!s->dma->mpu->port[

                      s->dma->src].addr_valid(s->dma->mpu,

                              s->dma->src_f2_top) ||

                      !s->dma->mpu->port[

                      s->dma->src].addr_valid(s->dma->mpu,

                              s->dma->src_f2_bottom)))) {

        s->dma->condition |= 1 << 2;

        if (s->dma->interrupts & (1 << 1))

            qemu_irq_raise(s->dma->irq);

        s->enable = 0;

        return;

    }

     if (s->dma->src == imif) {

        /* Framebuffers are in SRAM */

        s->dma->phys_framebuffer[0] = s->imif_base +

                s->dma->src_f1_top - OMAP_IMIF_BASE;

        s->dma->phys_framebuffer[1] = s->imif_base +

                s->dma->src_f2_top - OMAP_IMIF_BASE;

    } else {

        /* Framebuffers are in RAM */

        s->dma->phys_framebuffer[0] = s->emiff_base +

                s->dma->src_f1_top - OMAP_EMIFF_BASE;

        s->dma->phys_framebuffer[1] = s->emiff_base +

                s->dma->src_f2_top - OMAP_EMIFF_BASE;

    }

    if (s->plm != 2 && !s->palette_done) {

        /* FIXME: This is broken if it spans multiple RAM regions.  */

        memcpy(s->palette, host_ram_addr(

                s->dma->phys_framebuffer[s->dma->current_frame]), 0x200);

        s->palette_done = 1;

        omap_lcd_interrupts(s);

    }

}

static uint32_t omap_lcdc_read(void *opaque, target_phys_addr_t addr)

{

    struct omap_lcd_panel_s *s = (struct omap_lcd_panel_s *) opaque;

    switch (addr) {

    case 0x00:	/* LCD_CONTROL */

        return (s->tft << 23) | (s->plm << 20) |

                (s->tft << 7) | (s->interrupts << 3) |

                (s->mono << 1) | s->enable | s->ctrl | 0xfe000c34;

    case 0x04:	/* LCD_TIMING0 */

        return (s->timing[0] << 10) | (s->width - 1) | 0x0000000f;

    case 0x08:	/* LCD_TIMING1 */

        return (s->timing[1] << 10) | (s->height - 1);

    case 0x0c:	/* LCD_TIMING2 */

        return s->timing[2] | 0xfc000000;

    case 0x10:	/* LCD_STATUS */

        return (s->palette_done << 6) | (s->sync_error << 2) | s->frame_done;

    case 0x14:	/* LCD_SUBPANEL */

        return s->subpanel;

    default:

        break;

    }

    OMAP_BAD_REG(addr);

    return 0;

}

static void omap_lcdc_write(void *opaque, target_phys_addr_t addr,

                uint32_t value)

{

    struct omap_lcd_panel_s *s = (struct omap_lcd_panel_s *) opaque;

    switch (addr) {

    case 0x00:	/* LCD_CONTROL */

        s->plm = (value >> 20) & 3;

        s->tft = (value >> 7) & 1;

        s->interrupts = (value >> 3) & 3;

        s->mono = (value >> 1) & 1;

        s->ctrl = value & 0x01cff300;

        if (s->enable != (value & 1)) {

            s->enable = value & 1;

            omap_lcd_update(s);

        }

        break;

    case 0x04:	/* LCD_TIMING0 */

        s->timing[0] = value >> 10;

        s->width = (value & 0x3ff) + 1;

        break;

    case 0x08:	/* LCD_TIMING1 */

        s->timing[1] = value >> 10;

        s->height = (value & 0x3ff) + 1;

        break;

    case 0x0c:	/* LCD_TIMING2 */

        s->timing[2] = value;

        break;

    case 0x10:	/* LCD_STATUS */

        break;

    case 0x14:	/* LCD_SUBPANEL */

        s->subpanel = value & 0xa1ffffff;

        break;

    default:

        OMAP_BAD_REG(addr);

    }

}

static CPUReadMemoryFunc *omap_lcdc_readfn[] = {

    omap_lcdc_read,

    omap_lcdc_read,

    omap_lcdc_read,

};

static CPUWriteMemoryFunc *omap_lcdc_writefn[] = {

    omap_lcdc_write,

    omap_lcdc_write,

    omap_lcdc_write,

};

void omap_lcdc_reset(struct omap_lcd_panel_s *s)

{

    s->dma->current_frame = -1;

    s->plm = 0;

    s->tft = 0;

    s->mono = 0;

    s->enable = 0;

    s->width = 0;

    s->height = 0;

    s->interrupts = 0;

    s->timing[0] = 0;

    s->timing[1] = 0;

    s->timing[2] = 0;

    s->subpanel = 0;

    s->palette_done = 0;

    s->frame_done = 0;

    s->sync_error = 0;

    s->invalidate = 1;

    s->subpanel = 0;

    s->ctrl = 0;

}

struct omap_lcd_panel_s *omap_lcdc_init(target_phys_addr_t base, qemu_irq irq,

                struct omap_dma_lcd_channel_s *dma, DisplayState *ds,

                ram_addr_t imif_base, ram_addr_t emiff_base, omap_clk clk)

{

    int iomemtype;

    struct omap_lcd_panel_s *s = (struct omap_lcd_panel_s *)

            qemu_mallocz(sizeof(struct omap_lcd_panel_s));

    s->irq = irq;

    s->dma = dma;

    s->imif_base = imif_base;

    s->emiff_base = emiff_base;

    omap_lcdc_reset(s);

    iomemtype = cpu_register_io_memory(0, omap_lcdc_readfn,

                    omap_lcdc_writefn, s);

    cpu_register_physical_memory(base, 0x100, iomemtype);

    s->state = gui_get_graphic_console(NULL,

                                       omap_update_display,

                                       omap_invalidate_display,

                                       omap_screen_dump, s);

    return s;

}