summaryrefslogtreecommitdiffstats
path: root/firmware/target/mips/ingenic_jz47xx/xduoo_x3/lcd-xduoo_x3.c
blob: d4ab26ea5f7119ce0c4fbc0d4e716158f67474fd (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
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2016 by Roman Stolyarov
 *
 * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/
#include "config.h"

#include "lcd.h"
#include "system.h"
#include "cpu.h"
#include "string.h"

/* LCD pins */
#define PIN_BL_EN   (32*4+0)

#define PIN_LCD_D0  (32*2+2)
#define PIN_LCD_D1  (32*2+3)
#define PIN_LCD_D2  (32*2+4)
#define PIN_LCD_D3  (32*2+5)
#define PIN_LCD_D4  (32*2+6)
#define PIN_LCD_D5  (32*2+7)
#define PIN_LCD_D6  (32*2+12)
#define PIN_LCD_D7  (32*2+13)

#define PIN_LCD_RD  (32*2+8)
#define PIN_LCD_DC  (32*2+9)
#define PIN_LCD_CS  (32*2+14)
#define PIN_LCD_RES (32*2+18)
#define PIN_LCD_WR  (32*2+19)

/* LCD setup codes */
#define LCD_SET_LOWER_COLUMN_ADDRESS              ((char)0x00)
#define LCD_SET_HIGHER_COLUMN_ADDRESS             ((char)0x10)
#define LCD_SET_DISPLAY_START_LINE                ((char)0x40)
#define LCD_SET_CONTRAST_CONTROL_REGISTER         ((char)0x81)
#define LCD_SET_CHARGE_PUMP                       ((char)0x8D)
#define LCD_SET_SEGMENT_REMAP                     ((char)0xA0)
#define LCD_SET_SEGMENT_REMAP_INV                 ((char)0xA1)
#define LCD_SET_ENTIRE_DISPLAY_OFF                ((char)0xA4)
#define LCD_SET_ENTIRE_DISPLAY_ON                 ((char)0xA5)
#define LCD_SET_NORMAL_DISPLAY                    ((char)0xA6)
#define LCD_SET_REVERSE_DISPLAY                   ((char)0xA7)
#define LCD_SET_MULTIPLEX_RATIO                   ((char)0xA8)
#define LCD_SET_DC_DC                             ((char)0xAD)
#define LCD_SET_DISPLAY_OFF                       ((char)0xAE)
#define LCD_SET_DISPLAY_ON                        ((char)0xAF)
#define LCD_SET_PAGE_ADDRESS                      ((char)0xB0)
#define LCD_SET_COM_OUTPUT_SCAN_DIRECTION         ((char)0xC0)
#define LCD_SET_COM_OUTPUT_SCAN_DIRECTION_INV     ((char)0xC8)
#define LCD_SET_DISPLAY_OFFSET                    ((char)0xD3)
#define LCD_SET_DISPLAY_CLOCK_AND_OSC_FREQ        ((char)0xD5)
#define LCD_SET_VCOM_HW_CONFIGURATION             ((char)0xDA)
#define LCD_SET_VCOM_DESELECT_LEVEL               ((char)0xDB)
#define LCD_SET_PRECHARGE_PERIOD                  ((char)0xD9)
#define LCD_NOP                                   ((char)0xE3)

/* LCD command codes */
#define LCD_CNTL_CONTRAST       0x81    /* Contrast */
#define LCD_CNTL_OUTSCAN        0xc8    /* Output scan direction */
#define LCD_CNTL_SEGREMAP       0xa1    /* Segment remap */
#define LCD_CNTL_DISPON         0xaf    /* Display on */

#define LCD_CNTL_PAGE           0xb0    /* Page address */
#define LCD_CNTL_HIGHCOL        0x10    /* Upper column address */
#define LCD_CNTL_LOWCOL         0x00    /* Lower column address */

#define LCD_COL_OFFSET 2 /* column offset */

static inline void bitdelay(void)
{
    unsigned int i = 15;
    __asm__ __volatile__ (
                          ".set noreorder    \n"
                          "1:                \n"
                          "bne  %0, $0, 1b   \n"
                          "addi %0, %0, -1   \n"
                          ".set reorder      \n"
                          : "=r" (i)
                          : "0" (i)
                          );
}

void lcd_hw_init(void)
{
    REG_GPIO_PXFUNC(2) = 0x000C73FC; /* D0-D7 RD DC CS RES WR -- GPIO/INTERRUPT */
    REG_GPIO_PXSELC(2) = 0x000C73FC; /* GPIO */

    REG_GPIO_PXPEC(2) = 0x000C73FC; /* ENABLE PULLUP*/

    REG_GPIO_PXDIRS(2) = 0x000C73FC; /* OUTPUT */
    REG_GPIO_PXDATS(2) = 0x000C73FC; /* D0-D7 RD DC CS RES WR -- SET BIT */

    REG_GPIO_PXSLC(2)  = 0x000C73FC; /* slew -- slow rate */

    REG_GPIO_PXDS0C(2) = 0x000C73FC; /* Low pin drive strength */
    REG_GPIO_PXDS1C(2) = 0x000C73FC;
    REG_GPIO_PXDS2C(2) = 0x000C73FC;

    __gpio_clear_pin(PIN_BL_EN);
    __gpio_as_output(PIN_BL_EN);
    __gpio_clear_pin(PIN_LCD_RES);
    udelay(1);
    __gpio_set_pin(PIN_LCD_RES);
    __gpio_clear_pin(PIN_LCD_CS);
}

void lcd_write_command(int byte)
{
    __gpio_clear_pin(PIN_LCD_DC);
    REG_GPIO_PXDATC(2) = 0x000030FC;
    REG_GPIO_PXDATS(2) = ((byte & 0xC0) << 6) | ((byte & 0x3F) << 2);
    __gpio_clear_pin(PIN_LCD_WR);
    bitdelay();
    __gpio_set_pin(PIN_LCD_WR);
    bitdelay();
}

void lcd_write_data(const fb_data* p_bytes, int count)
{
    __gpio_set_pin(PIN_LCD_DC);
    while (count--)
    {
        REG_GPIO_PXDATC(2) = 0x000030FC;
        REG_GPIO_PXDATS(2) = ((*p_bytes & 0xC0) << 6) | ((*p_bytes & 0x3F) << 2);
        p_bytes++;
        __gpio_clear_pin(PIN_LCD_WR);
        bitdelay();
        __gpio_set_pin(PIN_LCD_WR);
        bitdelay();
    }
}

void lcd_enable_power(bool onoff)
{
    if (onoff)
        __gpio_set_pin(PIN_BL_EN);
    else
        __gpio_clear_pin(PIN_BL_EN);
}

/** globals **/

static bool display_on = false; /* used by lcd_enable */

/*** hardware configuration ***/
int lcd_default_contrast(void)
{
    return DEFAULT_CONTRAST_SETTING;
}

void lcd_set_contrast(int val)
{
    static int last_val = 0xFFFFFF;
    
    if (val >= 0) /* brightness menu */
    {
        lcd_write_command(LCD_CNTL_CONTRAST);
        lcd_write_command(val);
    }
    else if (val != last_val)
    {
        /* here we change the voltage level and drive times 
         * longer precharge = dimmer display
         * higher voltage = shorter precharge required
         */
        int precharge;
        int vcomdsel;
        switch (val)
        {
            case -9:
                precharge = 0xFF;
                vcomdsel  = 0x10;
                break;
            case -8:
                precharge = 0xF9;
                vcomdsel  = 0x10;
                break;
            case -7:
                precharge = 0xF6;
                vcomdsel  = 0x20;
                break;
            default:
            case -6:
                precharge = 0xF1;
                vcomdsel  = 0x30;
                break;
            case -5:
                precharge = 0xF1;
                vcomdsel  = 0x40;
                break;
            case -4:
                precharge = 0x91;
                vcomdsel  = 0x50;
                break;
            case -3:
                precharge = 0x61;
                vcomdsel  = 0x60;
                break;
            case -2:
                precharge = 0x31;
                vcomdsel  = 0x65;
                break;
            case -1:
                precharge = 0x11;
                vcomdsel  = 0x70;
                break;
        }
        last_val = val;
        lcd_enable(false);
        /* Set pre-charge period */
        lcd_write_command(LCD_SET_PRECHARGE_PERIOD);
        lcd_write_command(precharge); /* VCC Generated by Internal DC/DC Circuit */

        /* Set VCOM deselect level */
        lcd_write_command(LCD_SET_VCOM_DESELECT_LEVEL);
        lcd_write_command(vcomdsel);
        lcd_enable(true);
    }
}

void lcd_set_invert_display(bool yesno)
{
    if (yesno)
        lcd_write_command(LCD_SET_REVERSE_DISPLAY);
    else
        lcd_write_command(LCD_SET_NORMAL_DISPLAY);
}

/* turn the display upside down (call lcd_update() afterwards) */
void lcd_set_flip(bool yesno)
{
    if (yesno)
    {
        lcd_write_command(LCD_SET_SEGMENT_REMAP);
        lcd_write_command(LCD_SET_COM_OUTPUT_SCAN_DIRECTION);
    }
    else
    {
        lcd_write_command(LCD_SET_SEGMENT_REMAP_INV);
        lcd_write_command(LCD_SET_COM_OUTPUT_SCAN_DIRECTION_INV);
    }
}

#ifdef HAVE_LCD_ENABLE
void lcd_enable(bool enable)
{
    if(display_on == enable)
        return;

    if( (display_on = enable) ) /* simple '=' is not a typo ! */
    {
        lcd_enable_power(enable);
        lcd_write_command(LCD_SET_DISPLAY_ON);
        send_event(LCD_EVENT_ACTIVATION, NULL);
    }
    else
    {
        lcd_write_command(LCD_SET_DISPLAY_OFF);
        lcd_enable_power(enable);
    }
}

bool lcd_active(void)
{
    return display_on;
}
#endif

/* LCD init, largely based on what OF does */
void lcd_init_device(void)
{
    int i;

    lcd_hw_init();

    /* Set display off */
    lcd_write_command(LCD_SET_DISPLAY_OFF);

    /* Set display clock and oscillator frequency */
    lcd_write_command(LCD_SET_DISPLAY_CLOCK_AND_OSC_FREQ);
    lcd_write_command(0x80);

    /* Set multiplex ratio*/
    lcd_write_command(LCD_SET_MULTIPLEX_RATIO);
    lcd_write_command(0x3F);

    /* Set display offset */
    lcd_write_command(LCD_SET_DISPLAY_OFFSET);
    lcd_write_command(0x00);

    /* Set starting line as 0 */
    lcd_write_command(LCD_SET_DISPLAY_START_LINE);

    /* Set charge pump */
    lcd_write_command(LCD_SET_CHARGE_PUMP);
    lcd_write_command(0x14); /* VCC Generated by Internal DC/DC Circuit */

    /* Column 131 is remapped to SEG0 */
    lcd_write_command(LCD_SET_SEGMENT_REMAP_INV);

    /* Invert COM scan direction (N-1 to 0) */
    lcd_write_command(LCD_SET_COM_OUTPUT_SCAN_DIRECTION_INV);

    /* Set COM hardware configuration */
    lcd_write_command(LCD_SET_VCOM_HW_CONFIGURATION);
    lcd_write_command(0x12);

    /* Set contrast control */
    lcd_write_command(LCD_SET_CONTRAST_CONTROL_REGISTER);
    lcd_write_command(0xCF); /* VCC Generated by Internal DC/DC Circuit */

    /* Set pre-charge period */
    lcd_write_command(LCD_SET_PRECHARGE_PERIOD);
    lcd_write_command(0xF1); /* VCC Generated by Internal DC/DC Circuit */

    /* Set VCOM deselect level */
    lcd_write_command(LCD_SET_VCOM_DESELECT_LEVEL);
    lcd_write_command(0x20);

    /* Set normal display mode (not every pixel ON) */
    lcd_write_command(LCD_SET_ENTIRE_DISPLAY_OFF);

    /* Set normal display mode (not inverted) */
    lcd_write_command(LCD_SET_NORMAL_DISPLAY);

    fb_data p_bytes[LCD_WIDTH + 2 * LCD_COL_OFFSET];
    memset(p_bytes, 0, sizeof(p_bytes)); /* fills with 0 : pixel off */
    for(i = 0; i < 8; i++)
    {
        lcd_write_command (LCD_SET_PAGE_ADDRESS | (i /*& 0xf*/));
        lcd_write_data(p_bytes, LCD_WIDTH + 2 * LCD_COL_OFFSET);
    }

    lcd_enable(true);

    lcd_update();
}

/*** Update functions ***/

/* returns LCD_CNTL_HIGHCOL or'd with higher 4 bits of
   the 8-bit column address for the display data RAM.
*/
static inline int get_column_high_byte(const int x)
{
    return (LCD_CNTL_HIGHCOL | (((x+LCD_COL_OFFSET) >> 4) & 0xf));
}

/* returns LCD_CNTL_LOWCOL or'd with lower 4 bits of
   the 8-bit column address for the display data RAM.
*/
static inline int get_column_low_byte(const int x)
{
     return (LCD_CNTL_LOWCOL | ((x+LCD_COL_OFFSET) & 0xf));
}

/* Performance function that works with an external buffer
   note that by and bheight are in 8-pixel units! */
void lcd_blit_mono(const unsigned char *data, int x, int by, int width,
                   int bheight, int stride)
{
    if(!display_on)
        return;

    const int column_high = get_column_high_byte(x);
    const int column_low = get_column_low_byte(x);

    /* Copy display bitmap to hardware */
    while (bheight--)
    {
        lcd_write_command (LCD_CNTL_PAGE | (by++ & 0xf));
        lcd_write_command (column_high);
        lcd_write_command (column_low);

        lcd_write_data(data, width);
        data += stride;
    }
}


#ifndef BOOTLOADER
/* Helper function for lcd_grey_phase_blit(). */
void lcd_grey_data(unsigned char *values, unsigned char *phases, int count) ICODE_ATTR;
void lcd_grey_data(unsigned char *values, unsigned char *phases, int count)
{
    unsigned long ltmp;
    unsigned long *lval = (unsigned long *)values;
    unsigned long *lpha = (unsigned long *)phases;
    const unsigned long mask = 0x80808080;

    __gpio_set_pin(PIN_LCD_DC);
    while(count--)
    {
        /* calculate disp data from phase we only use the last byte (8bits) */
        ltmp = mask & lpha[0];         // ltmp= 3.......2.......1.......0.......
        ltmp |= (mask & lpha[1]) >> 4; // ltmp= 7.......6.......5.......4.......
        /* phase0 | phase1 >> 4 */     // ltmp= 3...7...2...6...1...5...0...4...
        ltmp |= ltmp >> 9;             // ltmp= 3...7...23..67..12..56..01..45..
        ltmp |= ltmp >> 9;             // ltmp= 3...7...23..67..123.567.012.456.
        ltmp |= ltmp >> 9;             // ltmp= 3...7...23..67..123.567.01234567

        /* update the phases */
        lpha[0] = lval[0] + (lpha[0] & ~mask);
        lpha[1] = lval[1] + (lpha[1] & ~mask);

        REG_GPIO_PXDATC(2) = 0x000030FC;
        REG_GPIO_PXDATS(2) = ((ltmp & 0xC0) << 6) | ((ltmp & 0x3F) << 2);
        __gpio_clear_pin(PIN_LCD_WR);
        bitdelay();
        __gpio_set_pin(PIN_LCD_WR);
        bitdelay();

        lpha+=2;
        lval+=2;
    }
}

/* Performance function that works with an external buffer
   note that by and bheight are in 8-pixel units! */
void lcd_blit_grey_phase(unsigned char *values, unsigned char *phases,
                         int x, int by, int width, int bheight, int stride)
{
    if(!display_on)
        return;

    const int column_high = get_column_high_byte(x);
    const int column_low = get_column_low_byte(x);

    stride <<= 3; /* 8 pixels per block */
    /* Copy display bitmap to hardware */
    while (bheight--)
    {
        lcd_write_command (LCD_CNTL_PAGE | (by++ & 0xf));
        lcd_write_command (column_high);
        lcd_write_command (column_low);

        lcd_grey_data(values, phases, width);

        values += stride;
        phases += stride;
    }
}
#endif

/* Update the display.
   This must be called after all other LCD functions that change the display. */
void lcd_update(void) ICODE_ATTR;
void lcd_update(void)
{
    int y;

    if(!display_on)
        return;


    const int column_high = get_column_high_byte(0);
    const int column_low = get_column_low_byte(0);

    /* Copy display bitmap to hardware */
    for (y = 0; y < LCD_FBHEIGHT; y++)
    {
        lcd_write_command (LCD_CNTL_PAGE | (y & 0xf));
        lcd_write_command (column_high);
        lcd_write_command (column_low);

        lcd_write_data (FBADDR(0, y), LCD_WIDTH);
    }
}

/* Update a fraction of the display. */
void lcd_update_rect(int, int, int, int) ICODE_ATTR;
void lcd_update_rect(int x, int y, int width, int height)
{
    int ymax;

    if(!display_on)
        return;

    const int column_high = get_column_high_byte(x);
    const int column_low = get_column_low_byte(x);

    /* The Y coordinates have to work on even 8 pixel rows */
    if (x < 0)
    {
        width += x;
        x = 0;
    }

    if (x + width > LCD_WIDTH)
        width = LCD_WIDTH - x;

    if (width <= 0)
        return; /* nothing left to do, 0 is harmful to lcd_write_data() */

    if (y < 0)
    {
        height += y;
        y = 0;
    }

    if (y + height > LCD_HEIGHT)
        height = LCD_HEIGHT - y;

    if (height <= 0)
        return; /* nothing left to do */

    ymax = (y + height-1) >> 3;
    y >>= 3;

    /* Copy specified rectange bitmap to hardware */
    for (; y <= ymax; y++)
    {
        lcd_write_command (LCD_CNTL_PAGE | (y & 0xf));
        lcd_write_command (column_high);
        lcd_write_command (column_low);

        lcd_write_data (FBADDR(x,y), width);
    }
}