Archipelago » qemu

/*

 * Epson S1D13744/S1D13745 (Blizzard/Hailstorm/Tornado) LCD/TV controller.

 *

 * Copyright (C) 2008 Nokia Corporation

 * Written by Andrzej Zaborowski <andrew@openedhand.com>

 *

 * 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 or

 * (at your option) version 3 of the License.

 *

 * 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.,

 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 */

#include "qemu-common.h"

#include "sysemu.h"

#include "console.h"

#include "devices.h"

#include "vga_int.h"

#include "pixel_ops.h"

typedef void (*blizzard_fn_t)(uint8_t *, const uint8_t *, unsigned int);

typedef struct {

    uint8_t reg;

    uint32_t addr;

    int swallow;

    int pll;

    int pll_range;

    int pll_ctrl;

    uint8_t pll_mode;

    uint8_t clksel;

    int memenable;

    int memrefresh;

    uint8_t timing[3];

    int priority;

    uint8_t lcd_config;

    int x;

    int y;

    int skipx;

    int skipy;

    uint8_t hndp;

    uint8_t vndp;

    uint8_t hsync;

    uint8_t vsync;

    uint8_t pclk;

    uint8_t u;

    uint8_t v;

    uint8_t yrc[2];

    int ix[2];

    int iy[2];

    int ox[2];

    int oy[2];

    int enable;

    int blank;

    int bpp;

    int invalidate;

    int mx[2];

    int my[2];

    uint8_t mode;

    uint8_t effect;

    uint8_t iformat;

    uint8_t source;

    DisplayState *state;

    blizzard_fn_t *line_fn_tab[2];

    void *fb;

    uint8_t hssi_config[3];

    uint8_t tv_config;

    uint8_t tv_timing[4];

    uint8_t vbi;

    uint8_t tv_x;

    uint8_t tv_y;

    uint8_t tv_test;

    uint8_t tv_filter_config;

    uint8_t tv_filter_idx;

    uint8_t tv_filter_coeff[0x20];

    uint8_t border_r;

    uint8_t border_g;

    uint8_t border_b;

    uint8_t gamma_config;

    uint8_t gamma_idx;

    uint8_t gamma_lut[0x100];

    uint8_t matrix_ena;

    uint8_t matrix_coeff[0x12];

    uint8_t matrix_r;

    uint8_t matrix_g;

    uint8_t matrix_b;

    uint8_t pm;

    uint8_t status;

    uint8_t rgbgpio_dir;

    uint8_t rgbgpio;

    uint8_t gpio_dir;

    uint8_t gpio;

    uint8_t gpio_edge[2];

    uint8_t gpio_irq;

    uint8_t gpio_pdown;

    struct {

        int x;

        int y;

        int dx;

        int dy;

        int len;

        int buflen;

        void *buf;

        void *data;

        uint16_t *ptr;

        int angle;

        int pitch;

        blizzard_fn_t line_fn;

    } data;

} BlizzardState;

/* Bytes(!) per pixel */

static const int blizzard_iformat_bpp[0x10] = {

    0,

    2,        /* RGB 5:6:5*/

    3,        /* RGB 6:6:6 mode 1 */

    3,        /* RGB 8:8:8 mode 1 */

    0, 0,

    4,        /* RGB 6:6:6 mode 2 */

    4,        /* RGB 8:8:8 mode 2 */

    0,        /* YUV 4:2:2 */

    0,        /* YUV 4:2:0 */

    0, 0, 0, 0, 0, 0,

};

static inline void blizzard_rgb2yuv(int r, int g, int b,

                int *y, int *u, int *v)

{

    *y = 0x10 + ((0x838 * r + 0x1022 * g + 0x322 * b) >> 13);

    *u = 0x80 + ((0xe0e * b - 0x04c1 * r - 0x94e * g) >> 13);

    *v = 0x80 + ((0xe0e * r - 0x0bc7 * g - 0x247 * b) >> 13);

}

static void blizzard_window(BlizzardState *s)

{

    uint8_t *src, *dst;

    int bypp[2];

    int bypl[3];

    int y;

    blizzard_fn_t fn = s->data.line_fn;

    if (!fn)

        return;

    if (s->mx[0] > s->data.x)

        s->mx[0] = s->data.x;

    if (s->my[0] > s->data.y)

        s->my[0] = s->data.y;

    if (s->mx[1] < s->data.x + s->data.dx)

        s->mx[1] = s->data.x + s->data.dx;

    if (s->my[1] < s->data.y + s->data.dy)

        s->my[1] = s->data.y + s->data.dy;

    bypp[0] = s->bpp;

    bypp[1] = (ds_get_bits_per_pixel(s->state) + 7) >> 3;

    bypl[0] = bypp[0] * s->data.pitch;

    bypl[1] = bypp[1] * s->x;

    bypl[2] = bypp[0] * s->data.dx;

    src = s->data.data;

    dst = s->fb + bypl[1] * s->data.y + bypp[1] * s->data.x;

    for (y = s->data.dy; y > 0; y --, src += bypl[0], dst += bypl[1])

        fn(dst, src, bypl[2]);

}

static int blizzard_transfer_setup(BlizzardState *s)

{

    if (s->source > 3 || !s->bpp ||

                    s->ix[1] < s->ix[0] || s->iy[1] < s->iy[0])

        return 0;

    s->data.angle = s->effect & 3;

    s->data.line_fn = s->line_fn_tab[!!s->data.angle][s->iformat];

    s->data.x = s->ix[0];

    s->data.y = s->iy[0];

    s->data.dx = s->ix[1] - s->ix[0] + 1;

    s->data.dy = s->iy[1] - s->iy[0] + 1;

    s->data.len = s->bpp * s->data.dx * s->data.dy;

    s->data.pitch = s->data.dx;

    if (s->data.len > s->data.buflen) {

        s->data.buf = qemu_realloc(s->data.buf, s->data.len);

        s->data.buflen = s->data.len;

    }

    s->data.ptr = s->data.buf;

    s->data.data = s->data.buf;

    s->data.len /= 2;

    return 1;

}

static void blizzard_reset(BlizzardState *s)

{

    s->reg = 0;

    s->swallow = 0;

    s->pll = 9;

    s->pll_range = 1;

    s->pll_ctrl = 0x14;

    s->pll_mode = 0x32;

    s->clksel = 0x00;

    s->memenable = 0;

    s->memrefresh = 0x25c;

    s->timing[0] = 0x3f;

    s->timing[1] = 0x13;

    s->timing[2] = 0x21;

    s->priority = 0;

    s->lcd_config = 0x74;

    s->x = 8;

    s->y = 1;

    s->skipx = 0;

    s->skipy = 0;

    s->hndp = 3;

    s->vndp = 2;

    s->hsync = 1;

    s->vsync = 1;

    s->pclk = 0x80;

    s->ix[0] = 0;

    s->ix[1] = 0;

    s->iy[0] = 0;

    s->iy[1] = 0;

    s->ox[0] = 0;

    s->ox[1] = 0;

    s->oy[0] = 0;

    s->oy[1] = 0;

    s->yrc[0] = 0x00;

    s->yrc[1] = 0x30;

    s->u = 0;

    s->v = 0;

    s->iformat = 3;

    s->source = 0;

    s->bpp = blizzard_iformat_bpp[s->iformat];

    s->hssi_config[0] = 0x00;

    s->hssi_config[1] = 0x00;

    s->hssi_config[2] = 0x01;

    s->tv_config = 0x00;

    s->tv_timing[0] = 0x00;

    s->tv_timing[1] = 0x00;

    s->tv_timing[2] = 0x00;

    s->tv_timing[3] = 0x00;

    s->vbi = 0x10;

    s->tv_x = 0x14;

    s->tv_y = 0x03;

    s->tv_test = 0x00;

    s->tv_filter_config = 0x80;

    s->tv_filter_idx = 0x00;

    s->border_r = 0x10;

    s->border_g = 0x80;

    s->border_b = 0x80;

    s->gamma_config = 0x00;

    s->gamma_idx = 0x00;

    s->matrix_ena = 0x00;

    memset(&s->matrix_coeff, 0, sizeof(s->matrix_coeff));

    s->matrix_r = 0x00;

    s->matrix_g = 0x00;

    s->matrix_b = 0x00;

    s->pm = 0x02;

    s->status = 0x00;

    s->rgbgpio_dir = 0x00;

    s->gpio_dir = 0x00;

    s->gpio_edge[0] = 0x00;

    s->gpio_edge[1] = 0x00;

    s->gpio_irq = 0x00;

    s->gpio_pdown = 0xff;

}

static inline void blizzard_invalidate_display(void *opaque) {

    BlizzardState *s = (BlizzardState *) opaque;

    s->invalidate = 1;

}

static uint16_t blizzard_reg_read(void *opaque, uint8_t reg)

{

    BlizzardState *s = (BlizzardState *) opaque;

    switch (reg) {

    case 0x00:        /* Revision Code */

        return 0xa5;

    case 0x02:        /* Configuration Readback */

        return 0x83;        /* Macrovision OK, CNF[2:0] = 3 */

    case 0x04:        /* PLL M-Divider */

        return (s->pll - 1) | (1 << 7);

    case 0x06:        /* PLL Lock Range Control */

        return s->pll_range;

    case 0x08:        /* PLL Lock Synthesis Control 0 */

        return s->pll_ctrl & 0xff;

    case 0x0a:        /* PLL Lock Synthesis Control 1 */

        return s->pll_ctrl >> 8;

    case 0x0c:        /* PLL Mode Control 0 */

        return s->pll_mode;

    case 0x0e:        /* Clock-Source Select */

        return s->clksel;

    case 0x10:        /* Memory Controller Activate */

    case 0x14:        /* Memory Controller Bank 0 Status Flag */

        return s->memenable;

    case 0x18:        /* Auto-Refresh Interval Setting 0 */

        return s->memrefresh & 0xff;

    case 0x1a:        /* Auto-Refresh Interval Setting 1 */

        return s->memrefresh >> 8;

    case 0x1c:        /* Power-On Sequence Timing Control */

        return s->timing[0];

    case 0x1e:        /* Timing Control 0 */

        return s->timing[1];

    case 0x20:        /* Timing Control 1 */

        return s->timing[2];

    case 0x24:        /* Arbitration Priority Control */

        return s->priority;

    case 0x28:        /* LCD Panel Configuration */

        return s->lcd_config;

    case 0x2a:        /* LCD Horizontal Display Width */

        return s->x >> 3;

    case 0x2c:        /* LCD Horizontal Non-display Period */

        return s->hndp;

    case 0x2e:        /* LCD Vertical Display Height 0 */

        return s->y & 0xff;

    case 0x30:        /* LCD Vertical Display Height 1 */

        return s->y >> 8;

    case 0x32:        /* LCD Vertical Non-display Period */

        return s->vndp;

    case 0x34:        /* LCD HS Pulse-width */

        return s->hsync;

    case 0x36:        /* LCd HS Pulse Start Position */

        return s->skipx >> 3;

    case 0x38:        /* LCD VS Pulse-width */

        return s->vsync;

    case 0x3a:        /* LCD VS Pulse Start Position */

        return s->skipy;

    case 0x3c:        /* PCLK Polarity */

        return s->pclk;

    case 0x3e:        /* High-speed Serial Interface Tx Configuration Port 0 */

        return s->hssi_config[0];

    case 0x40:        /* High-speed Serial Interface Tx Configuration Port 1 */

        return s->hssi_config[1];

    case 0x42:        /* High-speed Serial Interface Tx Mode */

        return s->hssi_config[2];

    case 0x44:        /* TV Display Configuration */

        return s->tv_config;

    case 0x46 ... 0x4c:        /* TV Vertical Blanking Interval Data bits */

        return s->tv_timing[(reg - 0x46) >> 1];

    case 0x4e:        /* VBI: Closed Caption / XDS Control / Status */

        return s->vbi;

    case 0x50:        /* TV Horizontal Start Position */

        return s->tv_x;

    case 0x52:        /* TV Vertical Start Position */

        return s->tv_y;

    case 0x54:        /* TV Test Pattern Setting */

        return s->tv_test;

    case 0x56:        /* TV Filter Setting */

        return s->tv_filter_config;

    case 0x58:        /* TV Filter Coefficient Index */

        return s->tv_filter_idx;

    case 0x5a:        /* TV Filter Coefficient Data */

        if (s->tv_filter_idx < 0x20)

            return s->tv_filter_coeff[s->tv_filter_idx ++];

        return 0;

    case 0x60:        /* Input YUV/RGB Translate Mode 0 */

        return s->yrc[0];

    case 0x62:        /* Input YUV/RGB Translate Mode 1 */

        return s->yrc[1];

    case 0x64:        /* U Data Fix */

        return s->u;

    case 0x66:        /* V Data Fix */

        return s->v;

    case 0x68:        /* Display Mode */

        return s->mode;

    case 0x6a:        /* Special Effects */

        return s->effect;

    case 0x6c:        /* Input Window X Start Position 0 */

        return s->ix[0] & 0xff;

    case 0x6e:        /* Input Window X Start Position 1 */

        return s->ix[0] >> 3;

    case 0x70:        /* Input Window Y Start Position 0 */

        return s->ix[0] & 0xff;

    case 0x72:        /* Input Window Y Start Position 1 */

        return s->ix[0] >> 3;

    case 0x74:        /* Input Window X End Position 0 */

        return s->ix[1] & 0xff;

    case 0x76:        /* Input Window X End Position 1 */

        return s->ix[1] >> 3;

    case 0x78:        /* Input Window Y End Position 0 */

        return s->ix[1] & 0xff;

    case 0x7a:        /* Input Window Y End Position 1 */

        return s->ix[1] >> 3;

    case 0x7c:        /* Output Window X Start Position 0 */

        return s->ox[0] & 0xff;

    case 0x7e:        /* Output Window X Start Position 1 */

        return s->ox[0] >> 3;

    case 0x80:        /* Output Window Y Start Position 0 */

        return s->oy[0] & 0xff;

    case 0x82:        /* Output Window Y Start Position 1 */

        return s->oy[0] >> 3;

    case 0x84:        /* Output Window X End Position 0 */

        return s->ox[1] & 0xff;

    case 0x86:        /* Output Window X End Position 1 */

        return s->ox[1] >> 3;

    case 0x88:        /* Output Window Y End Position 0 */

        return s->oy[1] & 0xff;

    case 0x8a:        /* Output Window Y End Position 1 */

        return s->oy[1] >> 3;

    case 0x8c:        /* Input Data Format */

        return s->iformat;

    case 0x8e:        /* Data Source Select */

        return s->source;

    case 0x90:        /* Display Memory Data Port */

        return 0;

    case 0xa8:        /* Border Color 0 */

        return s->border_r;

    case 0xaa:        /* Border Color 1 */

        return s->border_g;

    case 0xac:        /* Border Color 2 */

        return s->border_b;

    case 0xb4:        /* Gamma Correction Enable */

        return s->gamma_config;

    case 0xb6:        /* Gamma Correction Table Index */

        return s->gamma_idx;

    case 0xb8:        /* Gamma Correction Table Data */

        return s->gamma_lut[s->gamma_idx ++];

    case 0xba:        /* 3x3 Matrix Enable */

        return s->matrix_ena;

    case 0xbc ... 0xde:        /* Coefficient Registers */

        return s->matrix_coeff[(reg - 0xbc) >> 1];

    case 0xe0:        /* 3x3 Matrix Red Offset */

        return s->matrix_r;

    case 0xe2:        /* 3x3 Matrix Green Offset */

        return s->matrix_g;

    case 0xe4:        /* 3x3 Matrix Blue Offset */

        return s->matrix_b;

    case 0xe6:        /* Power-save */

        return s->pm;

    case 0xe8:        /* Non-display Period Control / Status */

        return s->status | (1 << 5);

    case 0xea:        /* RGB Interface Control */

        return s->rgbgpio_dir;

    case 0xec:        /* RGB Interface Status */

        return s->rgbgpio;

    case 0xee:        /* General-purpose IO Pins Configuration */

        return s->gpio_dir;

    case 0xf0:        /* General-purpose IO Pins Status / Control */

        return s->gpio;

    case 0xf2:        /* GPIO Positive Edge Interrupt Trigger */

        return s->gpio_edge[0];

    case 0xf4:        /* GPIO Negative Edge Interrupt Trigger */

        return s->gpio_edge[1];

    case 0xf6:        /* GPIO Interrupt Status */

        return s->gpio_irq;

    case 0xf8:        /* GPIO Pull-down Control */

        return s->gpio_pdown;

    default:

        fprintf(stderr, "%s: unknown register %02x\n", __FUNCTION__, reg);

        return 0;

    }

}

static void blizzard_reg_write(void *opaque, uint8_t reg, uint16_t value)

{

    BlizzardState *s = (BlizzardState *) opaque;

    switch (reg) {

    case 0x04:        /* PLL M-Divider */

        s->pll = (value & 0x3f) + 1;

        break;

    case 0x06:        /* PLL Lock Range Control */

        s->pll_range = value & 3;

        break;

    case 0x08:        /* PLL Lock Synthesis Control 0 */

        s->pll_ctrl &= 0xf00;

        s->pll_ctrl |= (value << 0) & 0x0ff;

        break;

    case 0x0a:        /* PLL Lock Synthesis Control 1 */

        s->pll_ctrl &= 0x0ff;

        s->pll_ctrl |= (value << 8) & 0xf00;

        break;

    case 0x0c:        /* PLL Mode Control 0 */

        s->pll_mode = value & 0x77;

        if ((value & 3) == 0 || (value & 3) == 3)

            fprintf(stderr, "%s: wrong PLL Control bits (%i)\n",

                    __FUNCTION__, value & 3);

        break;

    case 0x0e:        /* Clock-Source Select */

        s->clksel = value & 0xff;

        break;

    case 0x10:        /* Memory Controller Activate */

        s->memenable = value & 1;

        break;

    case 0x14:        /* Memory Controller Bank 0 Status Flag */

        break;

    case 0x18:        /* Auto-Refresh Interval Setting 0 */

        s->memrefresh &= 0xf00;

        s->memrefresh |= (value << 0) & 0x0ff;

        break;

    case 0x1a:        /* Auto-Refresh Interval Setting 1 */

        s->memrefresh &= 0x0ff;

        s->memrefresh |= (value << 8) & 0xf00;

        break;

    case 0x1c:        /* Power-On Sequence Timing Control */

        s->timing[0] = value & 0x7f;

        break;

    case 0x1e:        /* Timing Control 0 */

        s->timing[1] = value & 0x17;

        break;

    case 0x20:        /* Timing Control 1 */

        s->timing[2] = value & 0x35;

        break;

    case 0x24:        /* Arbitration Priority Control */

        s->priority = value & 1;

        break;

    case 0x28:        /* LCD Panel Configuration */

        s->lcd_config = value & 0xff;

        if (value & (1 << 7))

            fprintf(stderr, "%s: data swap not supported!\n", __FUNCTION__);

        break;

    case 0x2a:        /* LCD Horizontal Display Width */

        s->x = value << 3;

        break;

    case 0x2c:        /* LCD Horizontal Non-display Period */

        s->hndp = value & 0xff;

        break;

    case 0x2e:        /* LCD Vertical Display Height 0 */

        s->y &= 0x300;

        s->y |= (value << 0) & 0x0ff;

        break;

    case 0x30:        /* LCD Vertical Display Height 1 */

        s->y &= 0x0ff;

        s->y |= (value << 8) & 0x300;

        break;

    case 0x32:        /* LCD Vertical Non-display Period */

        s->vndp = value & 0xff;

        break;

    case 0x34:        /* LCD HS Pulse-width */

        s->hsync = value & 0xff;

        break;

    case 0x36:        /* LCD HS Pulse Start Position */

        s->skipx = value & 0xff;

        break;

    case 0x38:        /* LCD VS Pulse-width */

        s->vsync = value & 0xbf;

        break;

    case 0x3a:        /* LCD VS Pulse Start Position */

        s->skipy = value & 0xff;

        break;

    case 0x3c:        /* PCLK Polarity */

        s->pclk = value & 0x82;

        /* Affects calculation of s->hndp, s->hsync and s->skipx.  */

        break;

    case 0x3e:        /* High-speed Serial Interface Tx Configuration Port 0 */

        s->hssi_config[0] = value;

        break;

    case 0x40:        /* High-speed Serial Interface Tx Configuration Port 1 */

        s->hssi_config[1] = value;

        if (((value >> 4) & 3) == 3)

            fprintf(stderr, "%s: Illegal active-data-links value\n",

                            __FUNCTION__);

        break;

    case 0x42:        /* High-speed Serial Interface Tx Mode */

        s->hssi_config[2] = value & 0xbd;

        break;

    case 0x44:        /* TV Display Configuration */

        s->tv_config = value & 0xfe;

        break;

    case 0x46 ... 0x4c:        /* TV Vertical Blanking Interval Data bits 0 */

        s->tv_timing[(reg - 0x46) >> 1] = value;

        break;

    case 0x4e:        /* VBI: Closed Caption / XDS Control / Status */

        s->vbi = value;

        break;

    case 0x50:        /* TV Horizontal Start Position */

        s->tv_x = value;

        break;

    case 0x52:        /* TV Vertical Start Position */

        s->tv_y = value & 0x7f;

        break;

    case 0x54:        /* TV Test Pattern Setting */

        s->tv_test = value;

        break;

    case 0x56:        /* TV Filter Setting */

        s->tv_filter_config = value & 0xbf;

        break;

    case 0x58:        /* TV Filter Coefficient Index */

        s->tv_filter_idx = value & 0x1f;

        break;

    case 0x5a:        /* TV Filter Coefficient Data */

        if (s->tv_filter_idx < 0x20)

            s->tv_filter_coeff[s->tv_filter_idx ++] = value;

        break;

    case 0x60:        /* Input YUV/RGB Translate Mode 0 */

        s->yrc[0] = value & 0xb0;

        break;

    case 0x62:        /* Input YUV/RGB Translate Mode 1 */

        s->yrc[1] = value & 0x30;

        break;

    case 0x64:        /* U Data Fix */

        s->u = value & 0xff;

        break;

    case 0x66:        /* V Data Fix */

        s->v = value & 0xff;

        break;

    case 0x68:        /* Display Mode */

        if ((s->mode ^ value) & 3)

            s->invalidate = 1;

        s->mode = value & 0xb7;

        s->enable = value & 1;

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

        if (value & (1 << 4))

            fprintf(stderr, "%s: Macrovision enable attempt!\n", __FUNCTION__);

        break;

    case 0x6a:        /* Special Effects */

        s->effect = value & 0xfb;

        break;

    case 0x6c:        /* Input Window X Start Position 0 */

        s->ix[0] &= 0x300;

        s->ix[0] |= (value << 0) & 0x0ff;

        break;

    case 0x6e:        /* Input Window X Start Position 1 */

        s->ix[0] &= 0x0ff;

        s->ix[0] |= (value << 8) & 0x300;

        break;

    case 0x70:        /* Input Window Y Start Position 0 */

        s->iy[0] &= 0x300;

        s->iy[0] |= (value << 0) & 0x0ff;

        break;

    case 0x72:        /* Input Window Y Start Position 1 */

        s->iy[0] &= 0x0ff;

        s->iy[0] |= (value << 8) & 0x300;

        break;

    case 0x74:        /* Input Window X End Position 0 */

        s->ix[1] &= 0x300;

        s->ix[1] |= (value << 0) & 0x0ff;

        break;

    case 0x76:        /* Input Window X End Position 1 */

        s->ix[1] &= 0x0ff;

        s->ix[1] |= (value << 8) & 0x300;

        break;

    case 0x78:        /* Input Window Y End Position 0 */

        s->iy[1] &= 0x300;

        s->iy[1] |= (value << 0) & 0x0ff;

        break;

    case 0x7a:        /* Input Window Y End Position 1 */

        s->iy[1] &= 0x0ff;

        s->iy[1] |= (value << 8) & 0x300;

        break;

    case 0x7c:        /* Output Window X Start Position 0 */

        s->ox[0] &= 0x300;

        s->ox[0] |= (value << 0) & 0x0ff;

        break;

    case 0x7e:        /* Output Window X Start Position 1 */

        s->ox[0] &= 0x0ff;

        s->ox[0] |= (value << 8) & 0x300;

        break;

    case 0x80:        /* Output Window Y Start Position 0 */

        s->oy[0] &= 0x300;

        s->oy[0] |= (value << 0) & 0x0ff;

        break;

    case 0x82:        /* Output Window Y Start Position 1 */

        s->oy[0] &= 0x0ff;

        s->oy[0] |= (value << 8) & 0x300;

        break;

    case 0x84:        /* Output Window X End Position 0 */

        s->ox[1] &= 0x300;

        s->ox[1] |= (value << 0) & 0x0ff;

        break;

    case 0x86:        /* Output Window X End Position 1 */

        s->ox[1] &= 0x0ff;

        s->ox[1] |= (value << 8) & 0x300;

        break;

    case 0x88:        /* Output Window Y End Position 0 */

        s->oy[1] &= 0x300;

        s->oy[1] |= (value << 0) & 0x0ff;

        break;

    case 0x8a:        /* Output Window Y End Position 1 */

        s->oy[1] &= 0x0ff;

        s->oy[1] |= (value << 8) & 0x300;

        break;

    case 0x8c:        /* Input Data Format */

        s->iformat = value & 0xf;

        s->bpp = blizzard_iformat_bpp[s->iformat];

        if (!s->bpp)

            fprintf(stderr, "%s: Illegal or unsupported input format %x\n",

                            __FUNCTION__, s->iformat);

        break;

    case 0x8e:        /* Data Source Select */

        s->source = value & 7;

        /* Currently all windows will be "destructive overlays".  */

        if ((!(s->effect & (1 << 3)) && (s->ix[0] != s->ox[0] ||

                                        s->iy[0] != s->oy[0] ||

                                        s->ix[1] != s->ox[1] ||

                                        s->iy[1] != s->oy[1])) ||

                        !((s->ix[1] - s->ix[0]) & (s->iy[1] - s->iy[0]) &

                          (s->ox[1] - s->ox[0]) & (s->oy[1] - s->oy[0]) & 1))

            fprintf(stderr, "%s: Illegal input/output window positions\n",

                            __FUNCTION__);

        blizzard_transfer_setup(s);

        break;

    case 0x90:        /* Display Memory Data Port */

        if (!s->data.len && !blizzard_transfer_setup(s))

            break;

        *s->data.ptr ++ = value;

        if (-- s->data.len == 0)

            blizzard_window(s);

        break;

    case 0xa8:        /* Border Color 0 */

        s->border_r = value;

        break;

    case 0xaa:        /* Border Color 1 */

        s->border_g = value;

        break;

    case 0xac:        /* Border Color 2 */

        s->border_b = value;

        break;

    case 0xb4:        /* Gamma Correction Enable */

        s->gamma_config = value & 0x87;

        break;

    case 0xb6:        /* Gamma Correction Table Index */

        s->gamma_idx = value;

        break;

    case 0xb8:        /* Gamma Correction Table Data */

        s->gamma_lut[s->gamma_idx ++] = value;

        break;

    case 0xba:        /* 3x3 Matrix Enable */

        s->matrix_ena = value & 1;

        break;

    case 0xbc ... 0xde:        /* Coefficient Registers */

        s->matrix_coeff[(reg - 0xbc) >> 1] = value & ((reg & 2) ? 0x80 : 0xff);

        break;

    case 0xe0:        /* 3x3 Matrix Red Offset */

        s->matrix_r = value;

        break;

    case 0xe2:        /* 3x3 Matrix Green Offset */

        s->matrix_g = value;

        break;

    case 0xe4:        /* 3x3 Matrix Blue Offset */

        s->matrix_b = value;

        break;

    case 0xe6:        /* Power-save */

        s->pm = value & 0x83;

        if (value & s->mode & 1)

            fprintf(stderr, "%s: The display must be disabled before entering "

                            "Standby Mode\n", __FUNCTION__);

        break;

    case 0xe8:        /* Non-display Period Control / Status */

        s->status = value & 0x1b;

        break;

    case 0xea:        /* RGB Interface Control */

        s->rgbgpio_dir = value & 0x8f;

        break;

    case 0xec:        /* RGB Interface Status */

        s->rgbgpio = value & 0xcf;

        break;

    case 0xee:        /* General-purpose IO Pins Configuration */

        s->gpio_dir = value;

        break;

    case 0xf0:        /* General-purpose IO Pins Status / Control */

        s->gpio = value;

        break;

    case 0xf2:        /* GPIO Positive Edge Interrupt Trigger */

        s->gpio_edge[0] = value;

        break;

    case 0xf4:        /* GPIO Negative Edge Interrupt Trigger */

        s->gpio_edge[1] = value;

        break;

    case 0xf6:        /* GPIO Interrupt Status */

        s->gpio_irq &= value;

        break;

    case 0xf8:        /* GPIO Pull-down Control */

        s->gpio_pdown = value;

        break;

    default:

        fprintf(stderr, "%s: unknown register %02x\n", __FUNCTION__, reg);