/*

 * Arm PrimeCell PL110 Color LCD Controller

 *

 * Copyright (c) 2005-2006 CodeSourcery.

 * Written by Paul Brook

 *

 * This code is licenced under the GNU LGPL

 */

#include "hw.h"

#include "primecell.h"

#include "gui.h"

#define PL110_CR_EN   0x001

#define PL110_CR_BGR  0x100

#define PL110_CR_BEBO 0x200

#define PL110_CR_BEPO 0x400

#define PL110_CR_PWR  0x800

enum pl110_bppmode

{

    BPP_1,

    BPP_2,

    BPP_4,

    BPP_8,

    BPP_16,

    BPP_32

};

typedef struct {

    DisplayState *ds;

    /* The Versatile/PB uses a slightly modified PL110 controller.  */

    int versatile;

    uint32_t timing[4];

    uint32_t cr;

    uint32_t upbase;

    uint32_t lpbase;

    uint32_t int_status;

    uint32_t int_mask;

    int cols;

    int rows;

    enum pl110_bppmode bpp;

    int invalidate;

    uint32_t pallette[256];

    uint32_t raw_pallette[128];

    qemu_irq irq;

} pl110_state;

static const unsigned char pl110_id[] =

{ 0x10, 0x11, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 };

/* The Arm documentation (DDI0224C) says the CLDC on the Versatile board

   has a different ID.  However Linux only looks for the normal ID.  */

#if 0

static const unsigned char pl110_versatile_id[] =

{ 0x93, 0x10, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 };

#else

#define pl110_versatile_id pl110_id

#endif

static inline uint32_t rgb_to_pixel8(unsigned int r, unsigned int g, unsigned b)

{

    return ((r >> 5) << 5) | ((g >> 5) << 2) | (b >> 6);

}

static inline uint32_t rgb_to_pixel15(unsigned int r, unsigned int g, unsigned b)

{

    return ((r >> 3) << 10) | ((g >> 3) << 5) | (b >> 3);

}

static inline uint32_t rgb_to_pixel16(unsigned int r, unsigned int g, unsigned b)

{

    return ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3);

}

static inline uint32_t rgb_to_pixel24(unsigned int r, unsigned int g, unsigned b)

{

    return (r << 16) | (g << 8) | b;

}

static inline uint32_t rgb_to_pixel32(unsigned int r, unsigned int g, unsigned b)

{

    return (r << 16) | (g << 8) | b;

}

typedef void (*drawfn)(uint32_t *, uint8_t *, const uint8_t *, int);

#define BITS 8

#include "pl110_template.h"

#define BITS 15

#include "pl110_template.h"

#define BITS 16

#include "pl110_template.h"

#define BITS 24

#include "pl110_template.h"

#define BITS 32

#include "pl110_template.h"

static int pl110_enabled(pl110_state *s)

{

  return (s->cr & PL110_CR_EN) && (s->cr & PL110_CR_PWR);

}

static void pl110_update_display(void *opaque)

{

    pl110_state *s = (pl110_state *)opaque;

    drawfn* fntable;

    drawfn fn;

    uint32_t *pallette;

    uint32_t addr;

    uint32_t base;

    int dest_width;

    int src_width;

    uint8_t *dest;

    uint8_t *src;

    int first, last = 0;

    int dirty, new_dirty;

    int i;

    int bpp_offset;

    if (!pl110_enabled(s))

        return;

    switch (ds_get_bits_per_pixel(s->ds)) {

    case 0:

        return;

    case 8:

        fntable = pl110_draw_fn_8;

        dest_width = 1;

        break;

    case 15:

        fntable = pl110_draw_fn_15;

        dest_width = 2;

        break;

    case 16:

        fntable = pl110_draw_fn_16;

        dest_width = 2;

        break;

    case 24:

        fntable = pl110_draw_fn_24;

        dest_width = 3;

        break;

    case 32:

        fntable = pl110_draw_fn_32;

        dest_width = 4;

        break;

    default:

        fprintf(stderr, "pl110: Bad color depth\n");

        exit(1);

    }

    if (s->cr & PL110_CR_BGR)

        bpp_offset = 0;

    else

        bpp_offset = 18;

    if (s->cr & PL110_CR_BEBO)

        fn = fntable[s->bpp + 6 + bpp_offset];

    else if (s->cr & PL110_CR_BEPO)

        fn = fntable[s->bpp + 12 + bpp_offset];

    else

        fn = fntable[s->bpp + bpp_offset];

    src_width = s->cols;

    switch (s->bpp) {

    case BPP_1:

        src_width >>= 3;

        break;

    case BPP_2:

        src_width >>= 2;

        break;

    case BPP_4:

        src_width >>= 1;

        break;

    case BPP_8:

        break;

    case BPP_16:

        src_width <<= 1;

        break;

    case BPP_32:

        src_width <<= 2;

        break;

    }

    dest_width *= s->cols;

    pallette = s->pallette;

    base = s->upbase;

    /* HACK: Arm aliases physical memory at 0x80000000.  */

    if (base > 0x80000000)

        base -= 0x80000000;

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

    src = host_ram_addr(base);

    dest = ds_get_data(s->ds);

    first = -1;

    addr = base;

    dirty = cpu_physical_memory_get_dirty(addr, VGA_DIRTY_FLAG);

    new_dirty = dirty;

    for (i = 0; i < s->rows; i++) {

        if ((addr & ~TARGET_PAGE_MASK) + src_width >= TARGET_PAGE_SIZE) {

            uint32_t tmp;

            new_dirty = 0;

            for (tmp = 0; tmp < src_width; tmp += TARGET_PAGE_SIZE) {

                new_dirty |= cpu_physical_memory_get_dirty(addr + tmp,

                                                           VGA_DIRTY_FLAG);

            }

        }

        if (dirty || new_dirty || s->invalidate) {

            fn(pallette, dest, src, s->cols);

            if (first == -1)

                first = i;

            last = i;

        }

        dirty = new_dirty;

        addr += src_width;

        dest += dest_width;

        src += src_width;

    }

    if (first < 0)

      return;

    s->invalidate = 0;

    cpu_physical_memory_reset_dirty(base + first * src_width,

                                    base + (last + 1) * src_width,

                                    VGA_DIRTY_FLAG);

    dpy_update(s->ds, 0, first, s->cols, last - first + 1);

}

static void pl110_invalidate_display(void * opaque)

{

    pl110_state *s = (pl110_state *)opaque;

    s->invalidate = 1;

}

static void pl110_update_pallette(pl110_state *s, int n)

{

    int i;

    uint32_t raw;

    unsigned int r, g, b;

    raw = s->raw_pallette[n];

    n <<= 1;

    for (i = 0; i < 2; i++) {

        r = (raw & 0x1f) << 3;

        raw >>= 5;

        g = (raw & 0x1f) << 3;

        raw >>= 5;

        b = (raw & 0x1f) << 3;

        /* The I bit is ignored.  */

        raw >>= 6;

        switch (ds_get_bits_per_pixel(s->ds)) {

        case 8:

            s->pallette[n] = rgb_to_pixel8(r, g, b);

            break;

        case 15:

            s->pallette[n] = rgb_to_pixel15(r, g, b);

            break;

        case 16:

            s->pallette[n] = rgb_to_pixel16(r, g, b);

            break;

        case 24:

        case 32:

            s->pallette[n] = rgb_to_pixel32(r, g, b);

            break;

        }

        n++;

    }

}

static void pl110_resize(pl110_state *s, int width, int height)

{

    if (width != s->cols || height != s->rows) {

        if (pl110_enabled(s)) {

            gui_resize_vt(s->ds, width, height);

        }

    }

    s->cols = width;

    s->rows = height;

}

/* Update interrupts.  */

static void pl110_update(pl110_state *s)

{

  /* TODO: Implement interrupts.  */

}

static uint32_t pl110_read(void *opaque, target_phys_addr_t offset)

{

    pl110_state *s = (pl110_state *)opaque;

    if (offset >= 0xfe0 && offset < 0x1000) {

        if (s->versatile)

            return pl110_versatile_id[(offset - 0xfe0) >> 2];

        else

            return pl110_id[(offset - 0xfe0) >> 2];

    }

    if (offset >= 0x200 && offset < 0x400) {

        return s->raw_pallette[(offset - 0x200) >> 2];

    }

    switch (offset >> 2) {

    case 0: /* LCDTiming0 */

        return s->timing[0];

    case 1: /* LCDTiming1 */

        return s->timing[1];

    case 2: /* LCDTiming2 */

        return s->timing[2];

    case 3: /* LCDTiming3 */

        return s->timing[3];

    case 4: /* LCDUPBASE */

        return s->upbase;

    case 5: /* LCDLPBASE */

        return s->lpbase;

    case 6: /* LCDIMSC */

	if (s->versatile)

	  return s->cr;

        return s->int_mask;

    case 7: /* LCDControl */

	if (s->versatile)

	  return s->int_mask;

        return s->cr;

    case 8: /* LCDRIS */

        return s->int_status;

    case 9: /* LCDMIS */

        return s->int_status & s->int_mask;

    case 11: /* LCDUPCURR */

        /* TODO: Implement vertical refresh.  */

        return s->upbase;

    case 12: /* LCDLPCURR */

        return s->lpbase;

    default:

        cpu_abort (cpu_single_env, "pl110_read: Bad offset %x\n", (int)offset);

        return 0;

    }

}

static void pl110_write(void *opaque, target_phys_addr_t offset,

                        uint32_t val)

{

    pl110_state *s = (pl110_state *)opaque;

    int n;

    /* For simplicity invalidate the display whenever a control register

       is writen to.  */

    s->invalidate = 1;

    if (offset >= 0x200 && offset < 0x400) {

        /* Pallette.  */

        n = (offset - 0x200) >> 2;

        s->raw_pallette[(offset - 0x200) >> 2] = val;

        pl110_update_pallette(s, n);

        return;

    }

    switch (offset >> 2) {

    case 0: /* LCDTiming0 */

        s->timing[0] = val;

        n = ((val & 0xfc) + 4) * 4;

        pl110_resize(s, n, s->rows);

        break;

    case 1: /* LCDTiming1 */

        s->timing[1] = val;

        n = (val & 0x3ff) + 1;

        pl110_resize(s, s->cols, n);

        break;

    case 2: /* LCDTiming2 */

        s->timing[2] = val;

        break;

    case 3: /* LCDTiming3 */

        s->timing[3] = val;

        break;

    case 4: /* LCDUPBASE */

        s->upbase = val;

        break;

    case 5: /* LCDLPBASE */

        s->lpbase = val;

        break;

    case 6: /* LCDIMSC */

        if (s->versatile)

            goto control;

    imsc:

        s->int_mask = val;

        pl110_update(s);

        break;

    case 7: /* LCDControl */

        if (s->versatile)

            goto imsc;

    control:

        s->cr = val;

        s->bpp = (val >> 1) & 7;

        if (pl110_enabled(s)) {

            gui_resize_vt(s->ds, s->cols, s->rows);

        }

        break;

    case 10: /* LCDICR */

        s->int_status &= ~val;

        pl110_update(s);

        break;

    default:

        cpu_abort (cpu_single_env, "pl110_write: Bad offset %x\n", (int)offset);

    }

}

static CPUReadMemoryFunc *pl110_readfn[] = {

   pl110_read,

   pl110_read,

   pl110_read

};

static CPUWriteMemoryFunc *pl110_writefn[] = {

   pl110_write,

   pl110_write,

   pl110_write

};

void *pl110_init(DisplayState *ds, uint32_t base, qemu_irq irq,

                 int versatile)

{

    pl110_state *s;

    int iomemtype;

    s = (pl110_state *)qemu_mallocz(sizeof(pl110_state));

    iomemtype = cpu_register_io_memory(0, pl110_readfn,

                                       pl110_writefn, s);

    cpu_register_physical_memory(base, 0x00001000, iomemtype);

    s->versatile = versatile;

    s->irq = irq;

    s->ds = gui_get_graphic_console(NULL,

                                    pl110_update_display,

                                    pl110_invalidate_display,

                                    NULL, s);

    /* ??? Save/restore.  */

    return s;

}