Archipelago » qemu

/*

 * SSD0323 OLED controller with OSRAM Pictiva 128x64 display.

 *

 * Copyright (c) 2006-2007 CodeSourcery.

 * Written by Paul Brook

 *

 * This code is licenced under the GPL.

 */

/* The controller can support a variety of different displays, but we only

   implement one.  Most of the commends relating to brightness and geometry

   setup are ignored. */

#include "hw.h"

#include "devices.h"

#include "console.h"

//#define DEBUG_SSD0323 1

#ifdef DEBUG_SSD0323

#define DPRINTF(fmt, args...) \

do { printf("ssd0323: " fmt , ##args); } while (0)

#define BADF(fmt, args...) \

do { fprintf(stderr, "ssd0323: error: " fmt , ##args); exit(1);} while (0)

#else

#define DPRINTF(fmt, args...) do {} while(0)

#define BADF(fmt, args...) \

do { fprintf(stderr, "ssd0323: error: " fmt , ##args);} while (0)

#endif

/* Scaling factor for pixels.  */

#define MAGNIFY 4

enum ssd0323_mode

{

    SSD0323_CMD,

    SSD0323_DATA

};

typedef struct {

    DisplayState *ds;

    int cmd_len;

    int cmd;

    int cmd_data[8];

    int row;

    int row_start;

    int row_end;

    int col;

    int col_start;

    int col_end;

    int redraw;

    enum ssd0323_mode mode;

    uint8_t framebuffer[128 * 80 / 2];

} ssd0323_state;

int ssd0323_xfer_ssi(void *opaque, int data)

{

    ssd0323_state *s = (ssd0323_state *)opaque;

    switch (s->mode) {

    case SSD0323_DATA:

        DPRINTF("data 0x%02x\n", data);

        s->framebuffer[s->col + s->row * 64] = data;

        s->col++;

        if (s->col > s->col_end) {

            s->row++;

            s->col = s->col_start;

        }

        if (s->row > s->row_end) {

            s->row = s->row_start;

        }

        s->redraw = 1;

        break;

    case SSD0323_CMD:

        DPRINTF("cmd 0x%02x\n", data);

        if (s->cmd_len == 0) {

            s->cmd = data;

        } else {

            s->cmd_data[s->cmd_len - 1] = data;

        }

        s->cmd_len++;

        switch (s->cmd) {

#define DATA(x) if (s->cmd_len <= (x)) return 0

        case 0x15: /* Set column.  */

            DATA(2);

            s->col_start = s->cmd_data[0] % 64;

            s->col_end = s->cmd_data[1] % 64;

            break;

        case 0x75: /* Set row.  */

            DATA(2);

            s->row_start = s->cmd_data[0] % 80;

            s->row_end = s->cmd_data[1] % 80;

            break;

        case 0x81: /* Set contrast */

            DATA(1);

            break;

        case 0x84: case 0x85: case 0x86: /* Max current.  */

            DATA(0);

            break;

        case 0xa0: /* Set remapping.  */

            /* FIXME: Implement this.  */

            DATA(1);

            break;

        case 0xa1: /* Set display start line.  */

        case 0xa2: /* Set display offset.  */

            /* FIXME: Implement these.  */

            DATA(1);

            break;

        case 0xa4: /* Normal mode.  */

        case 0xa5: /* All on.  */

        case 0xa6: /* All off.  */

        case 0xa7: /* Inverse.  */

            /* FIXME: Implement these.  */

            DATA(0);

            break;

        case 0xa8: /* Set multiplex ratio.  */

        case 0xad: /* Set DC-DC converter.  */

            DATA(1);

            /* Ignored.  Don't care.  */

            break;

        case 0xae: /* Display off.  */

        case 0xaf: /* Display on.  */

            DATA(0);

            /* TODO: Implement power control.  */

            break;

        case 0xb1: /* Set phase length.  */

        case 0xb2: /* Set row period.  */

        case 0xb3: /* Set clock rate.  */

        case 0xbc: /* Set precharge.  */

        case 0xbe: /* Set VCOMH.  */

        case 0xbf: /* Set segment low.  */

            DATA(1);

            /* Ignored.  Don't care.  */

            break;

        case 0xb8: /* Set grey scale table.  */

            /* FIXME: Implement this.  */

            DATA(8);

            break;

        case 0xe3: /* NOP.  */

            DATA(0);

            break;

        default:

            BADF("Unknown command: 0x%x\n", data);

        }

        s->cmd_len = 0;

        return 0;

    }

    return 0;

}

static void ssd0323_update_display(void *opaque)

{

    ssd0323_state *s = (ssd0323_state *)opaque;

    uint8_t *dest;

    uint8_t *src;

    int x;

    int y;

    int i;

    int line;

    char *colors[16];

    char colortab[MAGNIFY * 64];

    char *p;

    int dest_width;

    if (s->redraw) {

        switch (s->ds->depth) {

        case 0:

            return;

        case 15:

            dest_width = 2;

            break;

        case 16:

            dest_width = 2;

            break;

        case 24:

            dest_width = 3;

            break;

        case 32:

            dest_width = 4;

            break;

        default:

            BADF("Bad color depth\n");

            return;

        }

        p = colortab;

        for (i = 0; i < 16; i++) {

            int n;

            colors[i] = p;

            switch (s->ds->depth) {

            case 15:

                n = i * 2 + (i >> 3);

                p[0] = n | (n << 5);

                p[1] = (n << 2) | (n >> 3);

                break;

            case 16:

                n = i * 2 + (i >> 3);

                p[0] = n | (n << 6) | ((n << 1) & 0x20);

                p[1] = (n << 3) | (n >> 2);

                break;

            case 24:

            case 32:

                n = (i << 4) | i;

                p[0] = p[1] = p[2] = n;

                break;

            default:

                BADF("Bad color depth\n");

                return;

            }

            p += dest_width;

        }

        dest = s->ds->data;

        for (y = 0; y < 64; y++) {

            line = y;

            src = s->framebuffer + 64 * line;

            for (x = 0; x < 64; x++) {

                int val;

                val = *src >> 4;

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

                    memcpy(dest, colors[val], dest_width);

                    dest += dest_width;

                }

                val = *src & 0xf;

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

                    memcpy(dest, colors[val], dest_width);

                    dest += dest_width;

                }

                src++;

            }

            for (i = 1; i < MAGNIFY; i++) {

                memcpy(dest, dest - dest_width * MAGNIFY * 128,

                       dest_width * 128 * MAGNIFY);

                dest += dest_width * 128 * MAGNIFY;

            }

        }

    }

    dpy_update(s->ds, 0, 0, 128 * MAGNIFY, 64 * MAGNIFY);

}

static void ssd0323_invalidate_display(void * opaque)

{

    ssd0323_state *s = (ssd0323_state *)opaque;

    s->redraw = 1;

}

/* Command/data input.  */

static void ssd0323_cd(void *opaque, int n, int level)

{

    ssd0323_state *s = (ssd0323_state *)opaque;

    DPRINTF("%s mode\n", level ? "Data" : "Command");

    s->mode = level ? SSD0323_DATA : SSD0323_CMD;

}

void *ssd0323_init(DisplayState *ds, qemu_irq *cmd_p)

{

    ssd0323_state *s;

    qemu_irq *cmd;

    s = (ssd0323_state *)qemu_mallocz(sizeof(ssd0323_state));

    s->ds = ds;

    graphic_console_init(ds, ssd0323_update_display, ssd0323_invalidate_display,

                         NULL, s);

    dpy_resize(s->ds, 128 * MAGNIFY, 64 * MAGNIFY);

    s->col_end = 63;

    s->row_end = 79;

    cmd = qemu_allocate_irqs(ssd0323_cd, s, 1);

    *cmd_p = *cmd;

    return s;

}