summaryrefslogtreecommitdiffstats
path: root/drivers/video/omap/rfbi.c
blob: 2c1a3402bef019c03ba678b11c2394bb08a5f0e1 (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
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
/*
 * OMAP2 Remote Frame Buffer Interface support
 *
 * Copyright (C) 2005 Nokia Corporation
 * Author: Juha Yrjölä <juha.yrjola@nokia.com>
 *	   Imre Deak <imre.deak@nokia.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 of the License, or (at your
 * option) any later version.
 *
 * 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.,
 * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/platform_device.h>

#include "omapfb.h"
#include "dispc.h"

/* To work around an RFBI transfer rate limitation */
#define OMAP_RFBI_RATE_LIMIT	1

#define RFBI_BASE		0x48050800
#define RFBI_REVISION		0x0000
#define RFBI_SYSCONFIG		0x0010
#define RFBI_SYSSTATUS		0x0014
#define RFBI_CONTROL		0x0040
#define RFBI_PIXEL_CNT		0x0044
#define RFBI_LINE_NUMBER	0x0048
#define RFBI_CMD		0x004c
#define RFBI_PARAM		0x0050
#define RFBI_DATA		0x0054
#define RFBI_READ		0x0058
#define RFBI_STATUS		0x005c
#define RFBI_CONFIG0		0x0060
#define RFBI_ONOFF_TIME0	0x0064
#define RFBI_CYCLE_TIME0	0x0068
#define RFBI_DATA_CYCLE1_0	0x006c
#define RFBI_DATA_CYCLE2_0	0x0070
#define RFBI_DATA_CYCLE3_0	0x0074
#define RFBI_VSYNC_WIDTH	0x0090
#define RFBI_HSYNC_WIDTH	0x0094

#define DISPC_BASE		0x48050400
#define DISPC_CONTROL		0x0040
#define DISPC_IRQ_FRAMEMASK     0x0001

static struct {
	void __iomem	*base;
	void		(*lcdc_callback)(void *data);
	void		*lcdc_callback_data;
	unsigned long	l4_khz;
	int		bits_per_cycle;
	struct omapfb_device *fbdev;
	struct clk	*dss_ick;
	struct clk	*dss1_fck;
	unsigned	tearsync_pin_cnt;
	unsigned	tearsync_mode;
} rfbi;

static inline void rfbi_write_reg(int idx, u32 val)
{
	__raw_writel(val, rfbi.base + idx);
}

static inline u32 rfbi_read_reg(int idx)
{
	return __raw_readl(rfbi.base + idx);
}

static int rfbi_get_clocks(void)
{
	rfbi.dss_ick = clk_get(&rfbi.fbdev->dssdev->dev, "ick");
	if (IS_ERR(rfbi.dss_ick)) {
		dev_err(rfbi.fbdev->dev, "can't get ick\n");
		return PTR_ERR(rfbi.dss_ick);
	}

	rfbi.dss1_fck = clk_get(&rfbi.fbdev->dssdev->dev, "fck");
	if (IS_ERR(rfbi.dss1_fck)) {
		dev_err(rfbi.fbdev->dev, "can't get dss1_fck\n");
		clk_put(rfbi.dss_ick);
		return PTR_ERR(rfbi.dss1_fck);
	}

	return 0;
}

static void rfbi_put_clocks(void)
{
	clk_put(rfbi.dss1_fck);
	clk_put(rfbi.dss_ick);
}

static void rfbi_enable_clocks(int enable)
{
	if (enable) {
		clk_enable(rfbi.dss_ick);
		clk_enable(rfbi.dss1_fck);
	} else {
		clk_disable(rfbi.dss1_fck);
		clk_disable(rfbi.dss_ick);
	}
}


#ifdef VERBOSE
static void rfbi_print_timings(void)
{
	u32 l;
	u32 time;

	l = rfbi_read_reg(RFBI_CONFIG0);
	time = 1000000000 / rfbi.l4_khz;
	if (l & (1 << 4))
		time *= 2;

	dev_dbg(rfbi.fbdev->dev, "Tick time %u ps\n", time);
	l = rfbi_read_reg(RFBI_ONOFF_TIME0);
	dev_dbg(rfbi.fbdev->dev,
		"CSONTIME %d, CSOFFTIME %d, WEONTIME %d, WEOFFTIME %d, "
		"REONTIME %d, REOFFTIME %d\n",
		l & 0x0f, (l >> 4) & 0x3f, (l >> 10) & 0x0f, (l >> 14) & 0x3f,
		(l >> 20) & 0x0f, (l >> 24) & 0x3f);

	l = rfbi_read_reg(RFBI_CYCLE_TIME0);
	dev_dbg(rfbi.fbdev->dev,
		"WECYCLETIME %d, RECYCLETIME %d, CSPULSEWIDTH %d, "
		"ACCESSTIME %d\n",
		(l & 0x3f), (l >> 6) & 0x3f, (l >> 12) & 0x3f,
		(l >> 22) & 0x3f);
}
#else
static void rfbi_print_timings(void) {}
#endif

static void rfbi_set_timings(const struct extif_timings *t)
{
	u32 l;

	BUG_ON(!t->converted);

	rfbi_enable_clocks(1);
	rfbi_write_reg(RFBI_ONOFF_TIME0, t->tim[0]);
	rfbi_write_reg(RFBI_CYCLE_TIME0, t->tim[1]);

	l = rfbi_read_reg(RFBI_CONFIG0);
	l &= ~(1 << 4);
	l |= (t->tim[2] ? 1 : 0) << 4;
	rfbi_write_reg(RFBI_CONFIG0, l);

	rfbi_print_timings();
	rfbi_enable_clocks(0);
}

static void rfbi_get_clk_info(u32 *clk_period, u32 *max_clk_div)
{
	*clk_period = 1000000000 / rfbi.l4_khz;
	*max_clk_div = 2;
}

static int ps_to_rfbi_ticks(int time, int div)
{
	unsigned long tick_ps;
	int ret;

	/* Calculate in picosecs to yield more exact results */
	tick_ps = 1000000000 / (rfbi.l4_khz) * div;

	ret = (time + tick_ps - 1) / tick_ps;

	return ret;
}

#ifdef OMAP_RFBI_RATE_LIMIT
static unsigned long rfbi_get_max_tx_rate(void)
{
	unsigned long	l4_rate, dss1_rate;
	int		min_l4_ticks = 0;
	int		i;

	/* According to TI this can't be calculated so make the
	 * adjustments for a couple of known frequencies and warn for
	 * others.
	 */
	static const struct {
		unsigned long l4_clk;		/* HZ */
		unsigned long dss1_clk;		/* HZ */
		unsigned long min_l4_ticks;
	} ftab[] = {
		{ 55,	132,	7, },		/* 7.86 MPix/s */
		{ 110,	110,	12, },		/* 9.16 MPix/s */
		{ 110,	132,	10, },		/* 11   Mpix/s */
		{ 120,	120,	10, },		/* 12   Mpix/s */
		{ 133,	133,	10, },		/* 13.3 Mpix/s */
	};

	l4_rate = rfbi.l4_khz / 1000;
	dss1_rate = clk_get_rate(rfbi.dss1_fck) / 1000000;

	for (i = 0; i < ARRAY_SIZE(ftab); i++) {
		/* Use a window instead of an exact match, to account
		 * for different DPLL multiplier / divider pairs.
		 */
		if (abs(ftab[i].l4_clk - l4_rate) < 3 &&
		    abs(ftab[i].dss1_clk - dss1_rate) < 3) {
			min_l4_ticks = ftab[i].min_l4_ticks;
			break;
		}
	}
	if (i == ARRAY_SIZE(ftab)) {
		/* Can't be sure, return anyway the maximum not
		 * rate-limited. This might cause a problem only for the
		 * tearing synchronisation.
		 */
		dev_err(rfbi.fbdev->dev,
			"can't determine maximum RFBI transfer rate\n");
		return rfbi.l4_khz * 1000;
	}
	return rfbi.l4_khz * 1000 / min_l4_ticks;
}
#else
static int rfbi_get_max_tx_rate(void)
{
	return rfbi.l4_khz * 1000;
}
#endif


static int rfbi_convert_timings(struct extif_timings *t)
{
	u32 l;
	int reon, reoff, weon, weoff, cson, csoff, cs_pulse;
	int actim, recyc, wecyc;
	int div = t->clk_div;

	if (div <= 0 || div > 2)
		return -1;

	/* Make sure that after conversion it still holds that:
	 * weoff > weon, reoff > reon, recyc >= reoff, wecyc >= weoff,
	 * csoff > cson, csoff >= max(weoff, reoff), actim > reon
	 */
	weon = ps_to_rfbi_ticks(t->we_on_time, div);
	weoff = ps_to_rfbi_ticks(t->we_off_time, div);
	if (weoff <= weon)
		weoff = weon + 1;
	if (weon > 0x0f)
		return -1;
	if (weoff > 0x3f)
		return -1;

	reon = ps_to_rfbi_ticks(t->re_on_time, div);
	reoff = ps_to_rfbi_ticks(t->re_off_time, div);
	if (reoff <= reon)
		reoff = reon + 1;
	if (reon > 0x0f)
		return -1;
	if (reoff > 0x3f)
		return -1;

	cson = ps_to_rfbi_ticks(t->cs_on_time, div);
	csoff = ps_to_rfbi_ticks(t->cs_off_time, div);
	if (csoff <= cson)
		csoff = cson + 1;
	if (csoff < max(weoff, reoff))
		csoff = max(weoff, reoff);
	if (cson > 0x0f)
		return -1;
	if (csoff > 0x3f)
		return -1;

	l =  cson;
	l |= csoff << 4;
	l |= weon  << 10;
	l |= weoff << 14;
	l |= reon  << 20;
	l |= reoff << 24;

	t->tim[0] = l;

	actim = ps_to_rfbi_ticks(t->access_time, div);
	if (actim <= reon)
		actim = reon + 1;
	if (actim > 0x3f)
		return -1;

	wecyc = ps_to_rfbi_ticks(t->we_cycle_time, div);
	if (wecyc < weoff)
		wecyc = weoff;
	if (wecyc > 0x3f)
		return -1;

	recyc = ps_to_rfbi_ticks(t->re_cycle_time, div);
	if (recyc < reoff)
		recyc = reoff;
	if (recyc > 0x3f)
		return -1;

	cs_pulse = ps_to_rfbi_ticks(t->cs_pulse_width, div);
	if (cs_pulse > 0x3f)
		return -1;

	l =  wecyc;
	l |= recyc    << 6;
	l |= cs_pulse << 12;
	l |= actim    << 22;

	t->tim[1] = l;

	t->tim[2] = div - 1;

	t->converted = 1;

	return 0;
}

static int rfbi_setup_tearsync(unsigned pin_cnt,
			       unsigned hs_pulse_time, unsigned vs_pulse_time,
			       int hs_pol_inv, int vs_pol_inv, int extif_div)
{
	int hs, vs;
	int min;
	u32 l;

	if (pin_cnt != 1 && pin_cnt != 2)
		return -EINVAL;

	hs = ps_to_rfbi_ticks(hs_pulse_time, 1);
	vs = ps_to_rfbi_ticks(vs_pulse_time, 1);
	if (hs < 2)
		return -EDOM;
	if (pin_cnt == 2)
		min = 2;
	else
		min = 4;
	if (vs < min)
		return -EDOM;
	if (vs == hs)
		return -EINVAL;
	rfbi.tearsync_pin_cnt = pin_cnt;
	dev_dbg(rfbi.fbdev->dev,
		"setup_tearsync: pins %d hs %d vs %d hs_inv %d vs_inv %d\n",
		pin_cnt, hs, vs, hs_pol_inv, vs_pol_inv);

	rfbi_enable_clocks(1);
	rfbi_write_reg(RFBI_HSYNC_WIDTH, hs);
	rfbi_write_reg(RFBI_VSYNC_WIDTH, vs);

	l = rfbi_read_reg(RFBI_CONFIG0);
	if (hs_pol_inv)
		l &= ~(1 << 21);
	else
		l |= 1 << 21;
	if (vs_pol_inv)
		l &= ~(1 << 20);
	else
		l |= 1 << 20;
	rfbi_enable_clocks(0);

	return 0;
}

static int rfbi_enable_tearsync(int enable, unsigned line)
{
	u32 l;

	dev_dbg(rfbi.fbdev->dev, "tearsync %d line %d mode %d\n",
		enable, line, rfbi.tearsync_mode);
	if (line > (1 << 11) - 1)
		return -EINVAL;

	rfbi_enable_clocks(1);
	l = rfbi_read_reg(RFBI_CONFIG0);
	l &= ~(0x3 << 2);
	if (enable) {
		rfbi.tearsync_mode = rfbi.tearsync_pin_cnt;
		l |= rfbi.tearsync_mode << 2;
	} else
		rfbi.tearsync_mode = 0;
	rfbi_write_reg(RFBI_CONFIG0, l);
	rfbi_write_reg(RFBI_LINE_NUMBER, line);
	rfbi_enable_clocks(0);

	return 0;
}

static void rfbi_write_command(const void *buf, unsigned int len)
{
	rfbi_enable_clocks(1);
	if (rfbi.bits_per_cycle == 16) {
		const u16 *w = buf;
		BUG_ON(len & 1);
		for (; len; len -= 2)
			rfbi_write_reg(RFBI_CMD, *w++);
	} else {
		const u8 *b = buf;
		BUG_ON(rfbi.bits_per_cycle != 8);
		for (; len; len--)
			rfbi_write_reg(RFBI_CMD, *b++);
	}
	rfbi_enable_clocks(0);
}

static void rfbi_read_data(void *buf, unsigned int len)
{
	rfbi_enable_clocks(1);
	if (rfbi.bits_per_cycle == 16) {
		u16 *w = buf;
		BUG_ON(len & ~1);
		for (; len; len -= 2) {
			rfbi_write_reg(RFBI_READ, 0);
			*w++ = rfbi_read_reg(RFBI_READ);
		}
	} else {
		u8 *b = buf;
		BUG_ON(rfbi.bits_per_cycle != 8);
		for (; len; len--) {
			rfbi_write_reg(RFBI_READ, 0);
			*b++ = rfbi_read_reg(RFBI_READ);
		}
	}
	rfbi_enable_clocks(0);
}

static void rfbi_write_data(const void *buf, unsigned int len)
{
	rfbi_enable_clocks(1);
	if (rfbi.bits_per_cycle == 16) {
		const u16 *w = buf;
		BUG_ON(len & 1);
		for (; len; len -= 2)
			rfbi_write_reg(RFBI_PARAM, *w++);
	} else {
		const u8 *b = buf;
		BUG_ON(rfbi.bits_per_cycle != 8);
		for (; len; len--)
			rfbi_write_reg(RFBI_PARAM, *b++);
	}
	rfbi_enable_clocks(0);
}

static void rfbi_transfer_area(int width, int height,
				void (callback)(void * data), void *data)
{
	u32 w;

	BUG_ON(callback == NULL);

	rfbi_enable_clocks(1);
	omap_dispc_set_lcd_size(width, height);

	rfbi.lcdc_callback = callback;
	rfbi.lcdc_callback_data = data;

	rfbi_write_reg(RFBI_PIXEL_CNT, width * height);

	w = rfbi_read_reg(RFBI_CONTROL);
	w |= 1;				/* enable */
	if (!rfbi.tearsync_mode)
		w |= 1 << 4;		/* internal trigger, reset by HW */
	rfbi_write_reg(RFBI_CONTROL, w);

	omap_dispc_enable_lcd_out(1);
}

static inline void _stop_transfer(void)
{
	u32 w;

	w = rfbi_read_reg(RFBI_CONTROL);
	rfbi_write_reg(RFBI_CONTROL, w & ~(1 << 0));
	rfbi_enable_clocks(0);
}

static void rfbi_dma_callback(void *data)
{
	_stop_transfer();
	rfbi.lcdc_callback(rfbi.lcdc_callback_data);
}

static void rfbi_set_bits_per_cycle(int bpc)
{
	u32 l;

	rfbi_enable_clocks(1);
	l = rfbi_read_reg(RFBI_CONFIG0);
	l &= ~(0x03 << 0);

	switch (bpc) {
	case 8:
		break;
	case 16:
		l |= 3;
		break;
	default:
		BUG();
	}
	rfbi_write_reg(RFBI_CONFIG0, l);
	rfbi.bits_per_cycle = bpc;
	rfbi_enable_clocks(0);
}

static int rfbi_init(struct omapfb_device *fbdev)
{
	u32 l;
	int r;

	rfbi.fbdev = fbdev;
	rfbi.base = ioremap(RFBI_BASE, SZ_1K);
	if (!rfbi.base) {
		dev_err(fbdev->dev, "can't ioremap RFBI\n");
		return -ENOMEM;
	}

	if ((r = rfbi_get_clocks()) < 0)
		return r;
	rfbi_enable_clocks(1);

	rfbi.l4_khz = clk_get_rate(rfbi.dss_ick) / 1000;

	/* Reset */
	rfbi_write_reg(RFBI_SYSCONFIG, 1 << 1);
	while (!(rfbi_read_reg(RFBI_SYSSTATUS) & (1 << 0)));

	l = rfbi_read_reg(RFBI_SYSCONFIG);
	/* Enable autoidle and smart-idle */
	l |= (1 << 0) | (2 << 3);
	rfbi_write_reg(RFBI_SYSCONFIG, l);

	/* 16-bit interface, ITE trigger mode, 16-bit data */
	l = (0x03 << 0) | (0x00 << 2) | (0x01 << 5) | (0x02 << 7);
	l |= (0 << 9) | (1 << 20) | (1 << 21);
	rfbi_write_reg(RFBI_CONFIG0, l);

	rfbi_write_reg(RFBI_DATA_CYCLE1_0, 0x00000010);

	l = rfbi_read_reg(RFBI_CONTROL);
	/* Select CS0, clear bypass mode */
	l = (0x01 << 2);
	rfbi_write_reg(RFBI_CONTROL, l);

	r = omap_dispc_request_irq(DISPC_IRQ_FRAMEMASK, rfbi_dma_callback,
				   NULL);
	if (r < 0) {
		dev_err(fbdev->dev, "can't get DISPC irq\n");
		rfbi_enable_clocks(0);
		return r;
	}

	l = rfbi_read_reg(RFBI_REVISION);
	pr_info("omapfb: RFBI version %d.%d initialized\n",
		(l >> 4) & 0x0f, l & 0x0f);

	rfbi_enable_clocks(0);

	return 0;
}

static void rfbi_cleanup(void)
{
	omap_dispc_free_irq(DISPC_IRQ_FRAMEMASK, rfbi_dma_callback, NULL);
	rfbi_put_clocks();
	iounmap(rfbi.base);
}

const struct lcd_ctrl_extif omap2_ext_if = {
	.init			= rfbi_init,
	.cleanup		= rfbi_cleanup,
	.get_clk_info		= rfbi_get_clk_info,
	.get_max_tx_rate	= rfbi_get_max_tx_rate,
	.set_bits_per_cycle	= rfbi_set_bits_per_cycle,
	.convert_timings	= rfbi_convert_timings,
	.set_timings		= rfbi_set_timings,
	.write_command		= rfbi_write_command,
	.read_data		= rfbi_read_data,
	.write_data		= rfbi_write_data,
	.transfer_area		= rfbi_transfer_area,
	.setup_tearsync		= rfbi_setup_tearsync,
	.enable_tearsync	= rfbi_enable_tearsync,

	.max_transmit_size	= (u32) ~0,
};

OpenPOWER on IntegriCloud