aboutsummaryrefslogtreecommitdiffstats
path: root/hw/ssd0323.c
blob: b640dd093b4f8cf13aab2de516c1c84f487ff456 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
/*
 * 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

#define REMAP_SWAP_COLUMN 0x01
#define REMAP_SWAP_NYBBLE 0x02
#define REMAP_VERTICAL    0x04
#define REMAP_SWAP_COM    0x10
#define REMAP_SPLIT_COM   0x40

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;
    int remap;
    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;
        if (s->remap & REMAP_VERTICAL) {
            s->row++;
            if (s->row > s->row_end) {
                s->row = s->row_start;
                s->col++;
            }
            if (s->col > s->col_end) {
                s->col = s->col_start;
            }
        } else {
            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 = 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 = 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);
            s->remap = s->cmd_data[0];
            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;
        case 0xff: /* Nasty hack because we don't handle chip selects
                      properly.  */
            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)
        return;

    switch (ds_get_bits_per_pixel(s->ds)) {
    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 (ds_get_bits_per_pixel(s->ds)) {
        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;
    }
    /* TODO: Implement row/column remapping.  */
    dest = ds_get_data(s->ds);
    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;
        }
    }
    s->redraw = 0;
    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;
}

static void ssd0323_save(QEMUFile *f, void *opaque)
{
    ssd0323_state *s = (ssd0323_state *)opaque;
    int i;

    qemu_put_be32(f, s->cmd_len);
    qemu_put_be32(f, s->cmd);
    for (i = 0; i < 8; i++)
        qemu_put_be32(f, s->cmd_data[i]);
    qemu_put_be32(f, s->row);
    qemu_put_be32(f, s->row_start);
    qemu_put_be32(f, s->row_end);
    qemu_put_be32(f, s->col);
    qemu_put_be32(f, s->col_start);
    qemu_put_be32(f, s->col_end);
    qemu_put_be32(f, s->redraw);
    qemu_put_be32(f, s->remap);
    qemu_put_be32(f, s->mode);
    qemu_put_buffer(f, s->framebuffer, sizeof(s->framebuffer));
}

static int ssd0323_load(QEMUFile *f, void *opaque, int version_id)
{
    ssd0323_state *s = (ssd0323_state *)opaque;
    int i;

    if (version_id != 1)
        return -EINVAL;

    s->cmd_len = qemu_get_be32(f);
    s->cmd = qemu_get_be32(f);
    for (i = 0; i < 8; i++)
        s->cmd_data[i] = qemu_get_be32(f);
    s->row = qemu_get_be32(f);
    s->row_start = qemu_get_be32(f);
    s->row_end = qemu_get_be32(f);
    s->col = qemu_get_be32(f);
    s->col_start = qemu_get_be32(f);
    s->col_end = qemu_get_be32(f);
    s->redraw = qemu_get_be32(f);
    s->remap = qemu_get_be32(f);
    s->mode = qemu_get_be32(f);
    qemu_get_buffer(f, s->framebuffer, sizeof(s->framebuffer));

    return 0;
}

void *ssd0323_init(qemu_irq *cmd_p)
{
    ssd0323_state *s;
    qemu_irq *cmd;

    s = (ssd0323_state *)qemu_mallocz(sizeof(ssd0323_state));
    s->col_end = 63;
    s->row_end = 79;
    s->ds = graphic_console_init(ssd0323_update_display,
                                 ssd0323_invalidate_display,
                                 NULL, NULL, s);
    qemu_console_resize(s->ds, 128 * MAGNIFY, 64 * MAGNIFY);

    cmd = qemu_allocate_irqs(ssd0323_cd, s, 1);
    *cmd_p = *cmd;

    register_savevm("ssd0323_oled", -1, 1, ssd0323_save, ssd0323_load, s);

    return s;
}