summaryrefslogtreecommitdiffstats
path: root/firmware/target/coldfire/mpio/hd200/lcd-hd200.c
blob: ba12e072da7dd00dfa208254b86457276fe8bf8c (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
/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2010 Marcin Bukat
 *
 * 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 "system.h"
#include "kernel.h"
#include "lcd.h"

/*** definitions ***/
/* TOMATO LSI 0350 - definitions and slightly tweaked functions
 * taken from lcd-remote-iaudio.c 
 */

#define LCD_SET_DUTY_RATIO 0x48
#define LCD_SELECT_ADC     0xa0
#define LCD_SELECT_SHL     0xc0
#define LCD_SET_COM0       0x44
#define LCD_OSC_ON         0xab
#define LCD_SELECT_DCDC    0x64
#define LCD_SELECT_RES     0x20
#define LCD_SET_VOLUME     0x81
#define LCD_SET_BIAS       0x50
#define LCD_CONTROL_POWER  0x28
#define LCD_DISPLAY_ON     0xae
#define LCD_SET_INITLINE   0x40
#define LCD_SET_COLUMN     0x10
#define LCD_SET_PAGE       0xb0
#define LCD_SET_GRAY       0x88
#define LCD_SET_PWM_FRC    0x90
#define LCD_SET_POWER_SAVE 0xa8
#define LCD_REVERSE        0xa6
#define LCD_RESET	   0xe2

/* cached settings */
static bool cached_invert = false;
static bool cached_flip = false;
static int cached_contrast = DEFAULT_CONTRAST_SETTING;

static struct mutex lcd_mtx;    /* The update functions use DMA and yield */

volatile unsigned char page IBSS_ATTR;
unsigned char column IBSS_ATTR;
unsigned int dma_len IBSS_ATTR;
volatile unsigned long dma_count IBSS_ATTR;

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

void lcd_powersave(bool on)
{
    if (on)
        /* enter power saving mode
         * this turns off lcd without controller reset
         * probably ~1mA saving
         */
        lcd_write_command(LCD_SET_POWER_SAVE | 1);
    else
        /* leave lcd power saving mode
         * no need to reset and initialize controller
         */
        lcd_write_command(LCD_SET_POWER_SAVE | 0);
}

void lcd_set_contrast(int val)
{
    if (val < MIN_CONTRAST_SETTING)
        val = MIN_CONTRAST_SETTING;
    else if (val > MAX_CONTRAST_SETTING)
        val = MAX_CONTRAST_SETTING;

    cached_contrast = val;
    lcd_write_command_e(LCD_SET_VOLUME, val);
}

void lcd_set_invert_display(bool yesno)
{
    cached_invert = yesno;
    lcd_write_command(LCD_REVERSE | yesno);

}

/* turn the display upside down (call lcd_update() afterwards) */
void lcd_set_flip(bool yesno)
{
    cached_flip = yesno;
    if(yesno)
    {
        lcd_write_command(LCD_SELECT_ADC | 1);
        lcd_write_command(LCD_SELECT_SHL | 0);
        lcd_write_command_e(LCD_SET_COM0, 0);
    }
    else
    {
        lcd_write_command(LCD_SELECT_ADC | 0);
        lcd_write_command(LCD_SELECT_SHL | 8);
        lcd_write_command_e(LCD_SET_COM0, 0);
    }
}

void lcd_shutdown(void)
{
    /* Set power save -> Power OFF (VDD - VSS) .. that's it */
    lcd_write_command(LCD_SET_POWER_SAVE | 1);
}

void lcd_init_device(void)
{
    and_l(~0x00000800, &GPIO_FUNCTION); /* CS3 line */ 

    /* LCD Reset GPO34 */
    or_l(0x00000004, &GPIO1_ENABLE);	/* set as output */
    or_l(0x00000004, &GPIO1_FUNCTION);  /* switch to secondary function - GPIO */
   
    and_l(~0x00000004, &GPIO1_OUT);	/* RESET low */
    sleep(1);				/* delay at least 1000 ns */
    or_l(0x00000004, &GPIO1_OUT);	/* RESET high */
    sleep(1);

    /* parameters setup taken from original firmware */
    lcd_write_command(LCD_RESET);
    lcd_write_command_e(LCD_SET_DUTY_RATIO,0x80); /* 1/128 */
    lcd_write_command(LCD_OSC_ON);
    lcd_write_command(LCD_SELECT_DCDC | 3); /* DC/DC 6xboost */
    lcd_write_command(LCD_SELECT_RES | 7); /* Regulator resistor: 7.2 */
    lcd_write_command(LCD_SET_BIAS | 6); /* 1/11 */
    lcd_write_command(LCD_SET_PWM_FRC | 6); /* 3FRC + 12PWM */
    lcd_write_command_e(LCD_SET_GRAY | 0, 0x00);
    lcd_write_command_e(LCD_SET_GRAY | 1, 0x00);
    lcd_write_command_e(LCD_SET_GRAY | 2, 0x0c);
    lcd_write_command_e(LCD_SET_GRAY | 3, 0x00);
    lcd_write_command_e(LCD_SET_GRAY | 4, 0xc4);
    lcd_write_command_e(LCD_SET_GRAY | 5, 0x00);
    lcd_write_command_e(LCD_SET_GRAY | 6, 0xcc);
    lcd_write_command_e(LCD_SET_GRAY | 7, 0x00);

    lcd_write_command(LCD_CONTROL_POWER | 7); /* All circuits ON */
    lcd_write_command(LCD_DISPLAY_ON | 1); /* display on */

    lcd_set_flip(cached_flip);
    lcd_set_contrast(cached_contrast);
    lcd_set_invert_display(cached_invert);

    /* Configure DMA3 */
    DAR3 = 0xf0000002; 
    DSR3 = 1;
    DIVR3 = 57;        /* DMA3 is mapped into vector 57 in system.c */
    ICR9 = (6 << 2);   /* Enable DMA3 interrupt at level 6, priority 0 */
    and_l(~(1<<17), &IMR);

    mutex_init(&lcd_mtx);

    lcd_update();
}

/* LCD DMA ISR */
void DMA3(void) __attribute__ ((interrupt_handler, section(".icode")));
void DMA3(void)
{
    DSR3 = 1;

    if (--dma_count > 0)
    {
        /* Setup write address in lcd controller ram*/
        lcd_write_command(LCD_SET_PAGE | ++page);
        lcd_write_command_e(LCD_SET_COLUMN | ((column >> 4) & 0xf), 
                            column & 0x0f);

        SAR3 = (unsigned long)&lcd_framebuffer[page][column];
        BCR3 = dma_len;
        DCR3 = DMA_INT | DMA_AA | DMA_BWC(1)
             | DMA_SINC | DMA_SSIZE(DMA_SIZE_LINE)
             | DMA_DSIZE(DMA_SIZE_BYTE) | DMA_START;

    }
}

/* 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)
{
    mutex_lock(&lcd_mtx);

    /* Setup initial address in lcd controller */
    lcd_write_command(LCD_SET_PAGE | 0);
    lcd_write_command_e(LCD_SET_COLUMN, 0);

    /* Initial lcd ram address */
    page = 0;
    column = 0;

    /* Number of pages to address */
    dma_count = LCD_FBHEIGHT;
    
    /* Transfer size in bytes to the given page */
    dma_len = LCD_WIDTH*2;

    /* Initialize DMA transfer */
    SAR3 = (unsigned long)lcd_framebuffer;
    BCR3 = LCD_WIDTH*2;
    DCR3 = DMA_INT | DMA_AA | DMA_BWC(1)
         | DMA_SINC | DMA_SSIZE(DMA_SIZE_LINE)
         | DMA_DSIZE(DMA_SIZE_BYTE) | DMA_START;

    while (dma_count > 0)
        yield();

    mutex_unlock(&lcd_mtx);
}

/* 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;

    /* The Y coordinates have to work on even 8 pixel rows */
    ymax = (y + height-1) >> 3;
    y >>= 3;

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

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

    mutex_lock(&lcd_mtx);

    if (ymax >= LCD_FBHEIGHT)
        ymax = LCD_FBHEIGHT-1;

    /* Initial lcd ram address*/
    lcd_write_command(LCD_SET_PAGE | y ); 
    lcd_write_command_e(LCD_SET_COLUMN | ((x >> 4) & 0xf), x & 0x0f);

    page = y;
    column = x;
    dma_len = width*2;
    dma_count = ymax - y + 1;

    /* Initialize DMA transfer */
    SAR3 = (unsigned long)&lcd_framebuffer[page][column];
    BCR3 = dma_len;
    DCR3 = DMA_INT | DMA_AA | DMA_BWC(1)
         | DMA_SINC | DMA_SSIZE(DMA_SIZE_LINE)
         | DMA_DSIZE(DMA_SIZE_BYTE) | DMA_START;

    while (dma_count > 0)
        yield();

    mutex_unlock(&lcd_mtx);

}

/* Helper function. */
void lcd_mono_data(const unsigned char *data, int count);

/* 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)
{
    while (bheight--)
    {
        lcd_write_command(LCD_SET_PAGE | (by & 0xf));
        lcd_write_command_e(LCD_SET_COLUMN | ((x >> 4) & 0xf), x & 0xf);

        lcd_mono_data(data, width);
        data += stride;
        by++;
    }
}

/* Helper function for lcd_grey_phase_blit(). */
void lcd_grey_data(unsigned char *values, unsigned char *phases, int count);

/* 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)
{
    stride <<= 3; /* 8 pixels per block */

    while (bheight--)
    {
        lcd_write_command(LCD_SET_PAGE | (by & 0xf));
        lcd_write_command_e(LCD_SET_COLUMN | ((x >> 4) & 0xf), x & 0xf);

        lcd_grey_data(values, phases, width);
        values += stride;
        phases += stride;
        by++;
    }
}