2 Driver for Spase SP8870 demodulator
4 Copyright (C) 1999 Juergen Peitz
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 * This driver needs external firmware. Please use the command
24 * "<kerneldir>/Documentation/dvb/get_dvb_firmware alps_tdlb7" to
25 * download/extract it, and then copy it to /usr/lib/hotplug/firmware.
27 #define SP8870_DEFAULT_FIRMWARE "dvb-fe-sp8870.fw"
29 #include <linux/init.h>
30 #include <linux/module.h>
31 #include <linux/moduleparam.h>
32 #include <linux/device.h>
33 #include <linux/firmware.h>
34 #include <linux/delay.h>
36 #include "dvb_frontend.h"
42 struct i2c_adapter* i2c;
44 struct dvb_frontend_ops ops;
46 const struct sp8870_config* config;
48 struct dvb_frontend frontend;
50 /* demodulator private data */
55 #define dprintk(args...) \
57 if (debug) printk(KERN_DEBUG "sp8870: " args); \
60 /* firmware size for sp8870 */
61 #define SP8870_FIRMWARE_SIZE 16382
63 /* starting point for firmware in file 'Sc_main.mc' */
64 #define SP8870_FIRMWARE_OFFSET 0x0A
66 static int sp8870_writereg (struct sp8870_state* state, u16 reg, u16 data)
68 u8 buf [] = { reg >> 8, reg & 0xff, data >> 8, data & 0xff };
69 struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 4 };
72 if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
73 dprintk ("%s: writereg error (err == %i, reg == 0x%02x, data == 0x%02x)\n", __FUNCTION__, err, reg, data);
80 static int sp8870_readreg (struct sp8870_state* state, u16 reg)
83 u8 b0 [] = { reg >> 8 , reg & 0xff };
85 struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 2 },
86 { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 2 } };
88 ret = i2c_transfer (state->i2c, msg, 2);
91 dprintk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret);
95 return (b1[0] << 8 | b1[1]);
98 static int sp8870_firmware_upload (struct sp8870_state* state, const struct firmware *fw)
101 char *fw_buf = fw->data;
107 dprintk ("%s: ...\n", __FUNCTION__);
109 if (fw->size < SP8870_FIRMWARE_SIZE + SP8870_FIRMWARE_OFFSET)
112 // system controller stop
113 sp8870_writereg(state, 0x0F00, 0x0000);
115 // instruction RAM register hiword
116 sp8870_writereg(state, 0x8F08, ((SP8870_FIRMWARE_SIZE / 2) & 0xFFFF));
118 // instruction RAM MWR
119 sp8870_writereg(state, 0x8F0A, ((SP8870_FIRMWARE_SIZE / 2) >> 16));
121 // do firmware upload
122 fw_pos = SP8870_FIRMWARE_OFFSET;
123 while (fw_pos < SP8870_FIRMWARE_SIZE + SP8870_FIRMWARE_OFFSET){
124 tx_len = (fw_pos <= SP8870_FIRMWARE_SIZE + SP8870_FIRMWARE_OFFSET - 252) ? 252 : SP8870_FIRMWARE_SIZE + SP8870_FIRMWARE_OFFSET - fw_pos;
125 // write register 0xCF0A
128 memcpy(&tx_buf[2], fw_buf + fw_pos, tx_len);
129 msg.addr = state->config->demod_address;
132 msg.len = tx_len + 2;
133 if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
134 printk("%s: firmware upload failed!\n", __FUNCTION__);
135 printk ("%s: i2c error (err == %i)\n", __FUNCTION__, err);
141 dprintk ("%s: done!\n", __FUNCTION__);
145 static void sp8870_microcontroller_stop (struct sp8870_state* state)
147 sp8870_writereg(state, 0x0F08, 0x000);
148 sp8870_writereg(state, 0x0F09, 0x000);
150 // microcontroller STOP
151 sp8870_writereg(state, 0x0F00, 0x000);
154 static void sp8870_microcontroller_start (struct sp8870_state* state)
156 sp8870_writereg(state, 0x0F08, 0x000);
157 sp8870_writereg(state, 0x0F09, 0x000);
159 // microcontroller START
160 sp8870_writereg(state, 0x0F00, 0x001);
161 // not documented but if we don't read 0x0D01 out here
162 // we don't get a correct data valid signal
163 sp8870_readreg(state, 0x0D01);
166 static int sp8870_read_data_valid_signal(struct sp8870_state* state)
168 return (sp8870_readreg(state, 0x0D02) > 0);
171 static int configure_reg0xc05 (struct dvb_frontend_parameters *p, u16 *reg0xc05)
173 int known_parameters = 1;
177 switch (p->u.ofdm.constellation) {
181 *reg0xc05 |= (1 << 10);
184 *reg0xc05 |= (2 << 10);
187 known_parameters = 0;
193 switch (p->u.ofdm.hierarchy_information) {
197 *reg0xc05 |= (1 << 7);
200 *reg0xc05 |= (2 << 7);
203 *reg0xc05 |= (3 << 7);
206 known_parameters = 0;
212 switch (p->u.ofdm.code_rate_HP) {
216 *reg0xc05 |= (1 << 3);
219 *reg0xc05 |= (2 << 3);
222 *reg0xc05 |= (3 << 3);
225 *reg0xc05 |= (4 << 3);
228 known_parameters = 0;
234 if (known_parameters)
235 *reg0xc05 |= (2 << 1); /* use specified parameters */
237 *reg0xc05 |= (1 << 1); /* enable autoprobing */
242 static int sp8870_wake_up(struct sp8870_state* state)
244 // enable TS output and interface pins
245 return sp8870_writereg(state, 0xC18, 0x00D);
248 static int sp8870_set_frontend_parameters (struct dvb_frontend* fe,
249 struct dvb_frontend_parameters *p)
251 struct sp8870_state* state = fe->demodulator_priv;
255 if ((err = configure_reg0xc05(p, ®0xc05)))
258 // system controller stop
259 sp8870_microcontroller_stop(state);
261 // set tuner parameters
262 sp8870_writereg(state, 0x206, 0x001);
263 state->config->pll_set(fe, p);
264 sp8870_writereg(state, 0x206, 0x000);
266 // sample rate correction bit [23..17]
267 sp8870_writereg(state, 0x0319, 0x000A);
269 // sample rate correction bit [16..0]
270 sp8870_writereg(state, 0x031A, 0x0AAB);
272 // integer carrier offset
273 sp8870_writereg(state, 0x0309, 0x0400);
275 // fractional carrier offset
276 sp8870_writereg(state, 0x030A, 0x0000);
278 // filter for 6/7/8 Mhz channel
279 if (p->u.ofdm.bandwidth == BANDWIDTH_6_MHZ)
280 sp8870_writereg(state, 0x0311, 0x0002);
281 else if (p->u.ofdm.bandwidth == BANDWIDTH_7_MHZ)
282 sp8870_writereg(state, 0x0311, 0x0001);
284 sp8870_writereg(state, 0x0311, 0x0000);
286 // scan order: 2k first = 0x0000, 8k first = 0x0001
287 if (p->u.ofdm.transmission_mode == TRANSMISSION_MODE_2K)
288 sp8870_writereg(state, 0x0338, 0x0000);
290 sp8870_writereg(state, 0x0338, 0x0001);
292 sp8870_writereg(state, 0xc05, reg0xc05);
294 // read status reg in order to clear pending irqs
295 sp8870_readreg(state, 0x200);
297 // system controller start
298 sp8870_microcontroller_start(state);
303 static int sp8870_init (struct dvb_frontend* fe)
305 struct sp8870_state* state = fe->demodulator_priv;
306 const struct firmware *fw = NULL;
308 sp8870_wake_up(state);
309 if (state->initialised) return 0;
310 state->initialised = 1;
312 dprintk ("%s\n", __FUNCTION__);
315 /* request the firmware, this will block until someone uploads it */
316 printk("sp8870: waiting for firmware upload (%s)...\n", SP8870_DEFAULT_FIRMWARE);
317 if (state->config->request_firmware(fe, &fw, SP8870_DEFAULT_FIRMWARE)) {
318 printk("sp8870: no firmware upload (timeout or file not found?)\n");
319 release_firmware(fw);
323 if (sp8870_firmware_upload(state, fw)) {
324 printk("sp8870: writing firmware to device failed\n");
325 release_firmware(fw);
328 printk("sp8870: firmware upload complete\n");
330 /* enable TS output and interface pins */
331 sp8870_writereg(state, 0xc18, 0x00d);
333 // system controller stop
334 sp8870_microcontroller_stop(state);
337 sp8870_writereg(state, 0x0301, 0x0003);
339 // Reed Solomon parity bytes passed to output
340 sp8870_writereg(state, 0x0C13, 0x0001);
342 // MPEG clock is suppressed if no valid data
343 sp8870_writereg(state, 0x0C14, 0x0001);
345 /* bit 0x010: enable data valid signal */
346 sp8870_writereg(state, 0x0D00, 0x010);
347 sp8870_writereg(state, 0x0D01, 0x000);
350 if (state->config->pll_init) {
351 sp8870_writereg(state, 0x206, 0x001);
352 state->config->pll_init(fe);
353 sp8870_writereg(state, 0x206, 0x000);
359 static int sp8870_read_status (struct dvb_frontend* fe, fe_status_t * fe_status)
361 struct sp8870_state* state = fe->demodulator_priv;
367 status = sp8870_readreg (state, 0x0200);
371 signal = sp8870_readreg (state, 0x0303);
376 *fe_status |= FE_HAS_SIGNAL;
378 *fe_status |= FE_HAS_SYNC;
380 *fe_status |= FE_HAS_LOCK | FE_HAS_CARRIER | FE_HAS_VITERBI;
385 static int sp8870_read_ber (struct dvb_frontend* fe, u32 * ber)
387 struct sp8870_state* state = fe->demodulator_priv;
393 ret = sp8870_readreg(state, 0xC08);
399 ret = sp8870_readreg(state, 0xC07);
413 static int sp8870_read_signal_strength(struct dvb_frontend* fe, u16 * signal)
415 struct sp8870_state* state = fe->demodulator_priv;
421 ret = sp8870_readreg (state, 0x306);
427 ret = sp8870_readreg (state, 0x303);
434 *signal = 0xFFFF - tmp;
439 static int sp8870_read_uncorrected_blocks (struct dvb_frontend* fe, u32* ublocks)
441 struct sp8870_state* state = fe->demodulator_priv;
446 ret = sp8870_readreg(state, 0xC0C);
458 // number of trials to recover from lockup
460 // maximum checks for data valid signal
461 #define MAXCHECKS 100
463 // only for debugging: counter for detected lockups
464 static int lockups = 0;
465 // only for debugging: counter for channel switches
466 static int switches = 0;
468 static int sp8870_set_frontend (struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
470 struct sp8870_state* state = fe->demodulator_priv;
473 The firmware of the sp8870 sometimes locks up after setting frontend parameters.
474 We try to detect this by checking the data valid signal.
475 If it is not set after MAXCHECKS we try to recover the lockup by setting
476 the frontend parameters again.
484 dprintk("%s: frequency = %i\n", __FUNCTION__, p->frequency);
486 for (trials = 1; trials <= MAXTRIALS; trials++) {
488 if ((err = sp8870_set_frontend_parameters(fe, p)))
491 for (check_count = 0; check_count < MAXCHECKS; check_count++) {
492 // valid = ((sp8870_readreg(i2c, 0x0200) & 4) == 0);
493 valid = sp8870_read_data_valid_signal(state);
495 dprintk("%s: delay = %i usec\n",
496 __FUNCTION__, check_count * 10);
506 printk("%s: firmware crash!!!!!!\n", __FUNCTION__);
513 printk("%s: firmware lockup!!!\n", __FUNCTION__);
514 printk("%s: recovered after %i trial(s))\n", __FUNCTION__, trials - 1);
519 printk("%s: switches = %i lockups = %i\n", __FUNCTION__, switches, lockups);
525 static int sp8870_sleep(struct dvb_frontend* fe)
527 struct sp8870_state* state = fe->demodulator_priv;
529 // tristate TS output and disable interface pins
530 return sp8870_writereg(state, 0xC18, 0x000);
533 static int sp8870_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
535 fesettings->min_delay_ms = 350;
536 fesettings->step_size = 0;
537 fesettings->max_drift = 0;
541 static void sp8870_release(struct dvb_frontend* fe)
543 struct sp8870_state* state = fe->demodulator_priv;
547 static struct dvb_frontend_ops sp8870_ops;
549 struct dvb_frontend* sp8870_attach(const struct sp8870_config* config,
550 struct i2c_adapter* i2c)
552 struct sp8870_state* state = NULL;
554 /* allocate memory for the internal state */
555 state = kmalloc(sizeof(struct sp8870_state), GFP_KERNEL);
556 if (state == NULL) goto error;
558 /* setup the state */
559 state->config = config;
561 memcpy(&state->ops, &sp8870_ops, sizeof(struct dvb_frontend_ops));
562 state->initialised = 0;
564 /* check if the demod is there */
565 if (sp8870_readreg(state, 0x0200) < 0) goto error;
567 /* create dvb_frontend */
568 state->frontend.ops = &state->ops;
569 state->frontend.demodulator_priv = state;
570 return &state->frontend;
577 static struct dvb_frontend_ops sp8870_ops = {
580 .name = "Spase SP8870 DVB-T",
582 .frequency_min = 470000000,
583 .frequency_max = 860000000,
584 .frequency_stepsize = 166666,
585 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 |
586 FE_CAN_FEC_3_4 | FE_CAN_FEC_5_6 |
587 FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
588 FE_CAN_QPSK | FE_CAN_QAM_16 |
589 FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
590 FE_CAN_HIERARCHY_AUTO | FE_CAN_RECOVER
593 .release = sp8870_release,
596 .sleep = sp8870_sleep,
598 .set_frontend = sp8870_set_frontend,
599 .get_tune_settings = sp8870_get_tune_settings,
601 .read_status = sp8870_read_status,
602 .read_ber = sp8870_read_ber,
603 .read_signal_strength = sp8870_read_signal_strength,
604 .read_ucblocks = sp8870_read_uncorrected_blocks,
607 module_param(debug, int, 0644);
608 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
610 MODULE_DESCRIPTION("Spase SP8870 DVB-T Demodulator driver");
611 MODULE_AUTHOR("Juergen Peitz");
612 MODULE_LICENSE("GPL");
614 EXPORT_SYMBOL(sp8870_attach);