summaryrefslogtreecommitdiff
path: root/drivers/media/dvb/frontends/sp8870.c
blob: 58e4792e0053f06b2a9b44eeaefa51d82a14096a (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
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
/*
    Driver for Spase SP8870 demodulator

    Copyright (C) 1999 Juergen Peitz

    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., 675 Mass Ave, Cambridge, MA 02139, USA.

*/
/*
 * This driver needs external firmware. Please use the command
 * "<kerneldir>/Documentation/dvb/get_dvb_firmware alps_tdlb7" to
 * download/extract it, and then copy it to /usr/lib/hotplug/firmware
 * or /lib/firmware (depending on configuration of firmware hotplug).
 */
#define SP8870_DEFAULT_FIRMWARE "dvb-fe-sp8870.fw"

#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/firmware.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/slab.h>

#include "dvb_frontend.h"
#include "sp8870.h"


struct sp8870_state {

	struct i2c_adapter* i2c;

	const struct sp8870_config* config;

	struct dvb_frontend frontend;

	/* demodulator private data */
	u8 initialised:1;
};

static int debug;
#define dprintk(args...) \
	do { \
		if (debug) printk(KERN_DEBUG "sp8870: " args); \
	} while (0)

/* firmware size for sp8870 */
#define SP8870_FIRMWARE_SIZE 16382

/* starting point for firmware in file 'Sc_main.mc' */
#define SP8870_FIRMWARE_OFFSET 0x0A

static int sp8870_writereg (struct sp8870_state* state, u16 reg, u16 data)
{
	u8 buf [] = { reg >> 8, reg & 0xff, data >> 8, data & 0xff };
	struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 4 };
	int err;

	if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
		dprintk ("%s: writereg error (err == %i, reg == 0x%02x, data == 0x%02x)\n", __func__, err, reg, data);
		return -EREMOTEIO;
	}

	return 0;
}

static int sp8870_readreg (struct sp8870_state* state, u16 reg)
{
	int ret;
	u8 b0 [] = { reg >> 8 , reg & 0xff };
	u8 b1 [] = { 0, 0 };
	struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 2 },
			   { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 2 } };

	ret = i2c_transfer (state->i2c, msg, 2);

	if (ret != 2) {
		dprintk("%s: readreg error (ret == %i)\n", __func__, ret);
		return -1;
	}

	return (b1[0] << 8 | b1[1]);
}

static int sp8870_firmware_upload (struct sp8870_state* state, const struct firmware *fw)
{
	struct i2c_msg msg;
	const char *fw_buf = fw->data;
	int fw_pos;
	u8 tx_buf[255];
	int tx_len;
	int err = 0;

	dprintk ("%s: ...\n", __func__);

	if (fw->size < SP8870_FIRMWARE_SIZE + SP8870_FIRMWARE_OFFSET)
		return -EINVAL;

	// system controller stop
	sp8870_writereg(state, 0x0F00, 0x0000);

	// instruction RAM register hiword
	sp8870_writereg(state, 0x8F08, ((SP8870_FIRMWARE_SIZE / 2) & 0xFFFF));

	// instruction RAM MWR
	sp8870_writereg(state, 0x8F0A, ((SP8870_FIRMWARE_SIZE / 2) >> 16));

	// do firmware upload
	fw_pos = SP8870_FIRMWARE_OFFSET;
	while (fw_pos < SP8870_FIRMWARE_SIZE + SP8870_FIRMWARE_OFFSET){
		tx_len = (fw_pos <= SP8870_FIRMWARE_SIZE + SP8870_FIRMWARE_OFFSET - 252) ? 252 : SP8870_FIRMWARE_SIZE + SP8870_FIRMWARE_OFFSET - fw_pos;
		// write register 0xCF0A
		tx_buf[0] = 0xCF;
		tx_buf[1] = 0x0A;
		memcpy(&tx_buf[2], fw_buf + fw_pos, tx_len);
		msg.addr = state->config->demod_address;
		msg.flags = 0;
		msg.buf = tx_buf;
		msg.len = tx_len + 2;
		if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
			printk("%s: firmware upload failed!\n", __func__);
			printk ("%s: i2c error (err == %i)\n", __func__, err);
			return err;
		}
		fw_pos += tx_len;
	}

	dprintk ("%s: done!\n", __func__);
	return 0;
};

static void sp8870_microcontroller_stop (struct sp8870_state* state)
{
	sp8870_writereg(state, 0x0F08, 0x000);
	sp8870_writereg(state, 0x0F09, 0x000);

	// microcontroller STOP
	sp8870_writereg(state, 0x0F00, 0x000);
}

static void sp8870_microcontroller_start (struct sp8870_state* state)
{
	sp8870_writereg(state, 0x0F08, 0x000);
	sp8870_writereg(state, 0x0F09, 0x000);

	// microcontroller START
	sp8870_writereg(state, 0x0F00, 0x001);
	// not documented but if we don't read 0x0D01 out here
	// we don't get a correct data valid signal
	sp8870_readreg(state, 0x0D01);
}

static int sp8870_read_data_valid_signal(struct sp8870_state* state)
{
	return (sp8870_readreg(state, 0x0D02) > 0);
}

static int configure_reg0xc05 (struct dtv_frontend_properties *p, u16 *reg0xc05)
{
	int known_parameters = 1;

	*reg0xc05 = 0x000;

	switch (p->modulation) {
	case QPSK:
		break;
	case QAM_16:
		*reg0xc05 |= (1 << 10);
		break;
	case QAM_64:
		*reg0xc05 |= (2 << 10);
		break;
	case QAM_AUTO:
		known_parameters = 0;
		break;
	default:
		return -EINVAL;
	};

	switch (p->hierarchy) {
	case HIERARCHY_NONE:
		break;
	case HIERARCHY_1:
		*reg0xc05 |= (1 << 7);
		break;
	case HIERARCHY_2:
		*reg0xc05 |= (2 << 7);
		break;
	case HIERARCHY_4:
		*reg0xc05 |= (3 << 7);
		break;
	case HIERARCHY_AUTO:
		known_parameters = 0;
		break;
	default:
		return -EINVAL;
	};

	switch (p->code_rate_HP) {
	case FEC_1_2:
		break;
	case FEC_2_3:
		*reg0xc05 |= (1 << 3);
		break;
	case FEC_3_4:
		*reg0xc05 |= (2 << 3);
		break;
	case FEC_5_6:
		*reg0xc05 |= (3 << 3);
		break;
	case FEC_7_8:
		*reg0xc05 |= (4 << 3);
		break;
	case FEC_AUTO:
		known_parameters = 0;
		break;
	default:
		return -EINVAL;
	};

	if (known_parameters)
		*reg0xc05 |= (2 << 1);	/* use specified parameters */
	else
		*reg0xc05 |= (1 << 1);	/* enable autoprobing */

	return 0;
}

static int sp8870_wake_up(struct sp8870_state* state)
{
	// enable TS output and interface pins
	return sp8870_writereg(state, 0xC18, 0x00D);
}

static int sp8870_set_frontend_parameters(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
	struct sp8870_state* state = fe->demodulator_priv;
	int  err;
	u16 reg0xc05;

	if ((err = configure_reg0xc05(p, &reg0xc05)))
		return err;

	// system controller stop
	sp8870_microcontroller_stop(state);

	// set tuner parameters
	if (fe->ops.tuner_ops.set_params) {
		fe->ops.tuner_ops.set_params(fe);
		if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
	}

	// sample rate correction bit [23..17]
	sp8870_writereg(state, 0x0319, 0x000A);

	// sample rate correction bit [16..0]
	sp8870_writereg(state, 0x031A, 0x0AAB);

	// integer carrier offset
	sp8870_writereg(state, 0x0309, 0x0400);

	// fractional carrier offset
	sp8870_writereg(state, 0x030A, 0x0000);

	// filter for 6/7/8 Mhz channel
	if (p->bandwidth_hz == 6000000)
		sp8870_writereg(state, 0x0311, 0x0002);
	else if (p->bandwidth_hz == 7000000)
		sp8870_writereg(state, 0x0311, 0x0001);
	else
		sp8870_writereg(state, 0x0311, 0x0000);

	// scan order: 2k first = 0x0000, 8k first = 0x0001
	if (p->transmission_mode == TRANSMISSION_MODE_2K)
		sp8870_writereg(state, 0x0338, 0x0000);
	else
		sp8870_writereg(state, 0x0338, 0x0001);

	sp8870_writereg(state, 0xc05, reg0xc05);

	// read status reg in order to clear pending irqs
	sp8870_readreg(state, 0x200);

	// system controller start
	sp8870_microcontroller_start(state);

	return 0;
}

static int sp8870_init (struct dvb_frontend* fe)
{
	struct sp8870_state* state = fe->demodulator_priv;
	const struct firmware *fw = NULL;

	sp8870_wake_up(state);
	if (state->initialised) return 0;
	state->initialised = 1;

	dprintk ("%s\n", __func__);


	/* request the firmware, this will block until someone uploads it */
	printk("sp8870: waiting for firmware upload (%s)...\n", SP8870_DEFAULT_FIRMWARE);
	if (state->config->request_firmware(fe, &fw, SP8870_DEFAULT_FIRMWARE)) {
		printk("sp8870: no firmware upload (timeout or file not found?)\n");
		return -EIO;
	}

	if (sp8870_firmware_upload(state, fw)) {
		printk("sp8870: writing firmware to device failed\n");
		release_firmware(fw);
		return -EIO;
	}
	release_firmware(fw);
	printk("sp8870: firmware upload complete\n");

	/* enable TS output and interface pins */
	sp8870_writereg(state, 0xc18, 0x00d);

	// system controller stop
	sp8870_microcontroller_stop(state);

	// ADC mode
	sp8870_writereg(state, 0x0301, 0x0003);

	// Reed Solomon parity bytes passed to output
	sp8870_writereg(state, 0x0C13, 0x0001);

	// MPEG clock is suppressed if no valid data
	sp8870_writereg(state, 0x0C14, 0x0001);

	/* bit 0x010: enable data valid signal */
	sp8870_writereg(state, 0x0D00, 0x010);
	sp8870_writereg(state, 0x0D01, 0x000);

	return 0;
}

static int sp8870_read_status (struct dvb_frontend* fe, fe_status_t * fe_status)
{
	struct sp8870_state* state = fe->demodulator_priv;
	int status;
	int signal;

	*fe_status = 0;

	status = sp8870_readreg (state, 0x0200);
	if (status < 0)
		return -EIO;

	signal = sp8870_readreg (state, 0x0303);
	if (signal < 0)
		return -EIO;

	if (signal > 0x0F)
		*fe_status |= FE_HAS_SIGNAL;
	if (status & 0x08)
		*fe_status |= FE_HAS_SYNC;
	if (status & 0x04)
		*fe_status |= FE_HAS_LOCK | FE_HAS_CARRIER | FE_HAS_VITERBI;

	return 0;
}

static int sp8870_read_ber (struct dvb_frontend* fe, u32 * ber)
{
	struct sp8870_state* state = fe->demodulator_priv;
	int ret;
	u32 tmp;

	*ber = 0;

	ret = sp8870_readreg(state, 0xC08);
	if (ret < 0)
		return -EIO;

	tmp = ret & 0x3F;

	ret = sp8870_readreg(state, 0xC07);
	if (ret < 0)
		return -EIO;

	 tmp = ret << 6;

	if (tmp >= 0x3FFF0)
		tmp = ~0;

	*ber = tmp;

	return 0;
}

static int sp8870_read_signal_strength(struct dvb_frontend* fe,  u16 * signal)
{
	struct sp8870_state* state = fe->demodulator_priv;
	int ret;
	u16 tmp;

	*signal = 0;

	ret = sp8870_readreg (state, 0x306);
	if (ret < 0)
		return -EIO;

	tmp = ret << 8;

	ret = sp8870_readreg (state, 0x303);
	if (ret < 0)
		return -EIO;

	tmp |= ret;

	if (tmp)
		*signal = 0xFFFF - tmp;

	return 0;
}

static int sp8870_read_uncorrected_blocks (struct dvb_frontend* fe, u32* ublocks)
{
	struct sp8870_state* state = fe->demodulator_priv;
	int ret;

	*ublocks = 0;

	ret = sp8870_readreg(state, 0xC0C);
	if (ret < 0)
		return -EIO;

	if (ret == 0xFFFF)
		ret = ~0;

	*ublocks = ret;

	return 0;
}

/* number of trials to recover from lockup */
#define MAXTRIALS 5
/* maximum checks for data valid signal */
#define MAXCHECKS 100

/* only for debugging: counter for detected lockups */
static int lockups;
/* only for debugging: counter for channel switches */
static int switches;

static int sp8870_set_frontend(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
	struct sp8870_state* state = fe->demodulator_priv;

	/*
	    The firmware of the sp8870 sometimes locks up after setting frontend parameters.
	    We try to detect this by checking the data valid signal.
	    If it is not set after MAXCHECKS we try to recover the lockup by setting
	    the frontend parameters again.
	*/

	int err = 0;
	int valid = 0;
	int trials = 0;
	int check_count = 0;

	dprintk("%s: frequency = %i\n", __func__, p->frequency);

	for (trials = 1; trials <= MAXTRIALS; trials++) {

		err = sp8870_set_frontend_parameters(fe);
		if (err)
			return err;

		for (check_count = 0; check_count < MAXCHECKS; check_count++) {
//			valid = ((sp8870_readreg(i2c, 0x0200) & 4) == 0);
			valid = sp8870_read_data_valid_signal(state);
			if (valid) {
				dprintk("%s: delay = %i usec\n",
					__func__, check_count * 10);
				break;
			}
			udelay(10);
		}
		if (valid)
			break;
	}

	if (!valid) {
		printk("%s: firmware crash!!!!!!\n", __func__);
		return -EIO;
	}

	if (debug) {
		if (valid) {
			if (trials > 1) {
				printk("%s: firmware lockup!!!\n", __func__);
				printk("%s: recovered after %i trial(s))\n",  __func__, trials - 1);
				lockups++;
			}
		}
		switches++;
		printk("%s: switches = %i lockups = %i\n", __func__, switches, lockups);
	}

	return 0;
}

static int sp8870_sleep(struct dvb_frontend* fe)
{
	struct sp8870_state* state = fe->demodulator_priv;

	// tristate TS output and disable interface pins
	return sp8870_writereg(state, 0xC18, 0x000);
}

static int sp8870_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
{
	fesettings->min_delay_ms = 350;
	fesettings->step_size = 0;
	fesettings->max_drift = 0;
	return 0;
}

static int sp8870_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
{
	struct sp8870_state* state = fe->demodulator_priv;

	if (enable) {
		return sp8870_writereg(state, 0x206, 0x001);
	} else {
		return sp8870_writereg(state, 0x206, 0x000);
	}
}

static void sp8870_release(struct dvb_frontend* fe)
{
	struct sp8870_state* state = fe->demodulator_priv;
	kfree(state);
}

static struct dvb_frontend_ops sp8870_ops;

struct dvb_frontend* sp8870_attach(const struct sp8870_config* config,
				   struct i2c_adapter* i2c)
{
	struct sp8870_state* state = NULL;

	/* allocate memory for the internal state */
	state = kzalloc(sizeof(struct sp8870_state), GFP_KERNEL);
	if (state == NULL) goto error;

	/* setup the state */
	state->config = config;
	state->i2c = i2c;
	state->initialised = 0;

	/* check if the demod is there */
	if (sp8870_readreg(state, 0x0200) < 0) goto error;

	/* create dvb_frontend */
	memcpy(&state->frontend.ops, &sp8870_ops, sizeof(struct dvb_frontend_ops));
	state->frontend.demodulator_priv = state;
	return &state->frontend;

error:
	kfree(state);
	return NULL;
}

static struct dvb_frontend_ops sp8870_ops = {
	.delsys = { SYS_DVBT },
	.info = {
		.name			= "Spase SP8870 DVB-T",
		.type			= FE_OFDM,
		.frequency_min		= 470000000,
		.frequency_max		= 860000000,
		.frequency_stepsize	= 166666,
		.caps			= FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 |
					  FE_CAN_FEC_3_4 | FE_CAN_FEC_5_6 |
					  FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
					  FE_CAN_QPSK | FE_CAN_QAM_16 |
					  FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
					  FE_CAN_HIERARCHY_AUTO |  FE_CAN_RECOVER
	},

	.release = sp8870_release,

	.init = sp8870_init,
	.sleep = sp8870_sleep,
	.i2c_gate_ctrl = sp8870_i2c_gate_ctrl,

	.set_frontend = sp8870_set_frontend,
	.get_tune_settings = sp8870_get_tune_settings,

	.read_status = sp8870_read_status,
	.read_ber = sp8870_read_ber,
	.read_signal_strength = sp8870_read_signal_strength,
	.read_ucblocks = sp8870_read_uncorrected_blocks,
};

module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");

MODULE_DESCRIPTION("Spase SP8870 DVB-T Demodulator driver");
MODULE_AUTHOR("Juergen Peitz");
MODULE_LICENSE("GPL");

EXPORT_SYMBOL(sp8870_attach);