drivers/media/dvb/frontends/sp8870.c

   1 /*
   2     Driver for Spase SP8870 demodulator
   3
   4     Copyright (C) 1999 Juergen Peitz
   5
   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.
  10
  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
  14
  15     GNU General Public License for more details.
  16
  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.
  20
  21 */
  22 /*
  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.
  26  */
  27 #define SP8870_DEFAULT_FIRMWARE "dvb-fe-sp8870.fw"
  28
  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>
  35
  36 #include "dvb_frontend.h"
  37 #include "sp8870.h"
  38
  39
  40 struct sp8870_state {
  41
  42         struct i2c_adapter* i2c;
  43
  44         struct dvb_frontend_ops ops;
  45
  46         const struct sp8870_config* config;
  47
  48         struct dvb_frontend frontend;
  49
  50         /* demodulator private data */
  51         u8 initialised:1;
  52 };
  53
  54 static int debug;
  55 #define dprintk(args...) \
  56         do { \
  57                 if (debug) printk(KERN_DEBUG "sp8870: " args); \
  58         } while (0)
  59
  60 /* firmware size for sp8870 */
  61 #define SP8870_FIRMWARE_SIZE 16382
  62
  63 /* starting point for firmware in file 'Sc_main.mc' */
  64 #define SP8870_FIRMWARE_OFFSET 0x0A
  65
  66 static int sp8870_writereg (struct sp8870_state* state, u16 reg, u16 data)
  67 {
  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 };
  70         int err;
  71
  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);
  74                 return -EREMOTEIO;
  75         }
  76
  77         return 0;
  78 }
  79
  80 static int sp8870_readreg (struct sp8870_state* state, u16 reg)
  81 {
  82         int ret;
  83         u8 b0 [] = { reg >> 8 , reg & 0xff };
  84         u8 b1 [] = { 0, 0 };
  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 } };
  87
  88         ret = i2c_transfer (state->i2c, msg, 2);
  89
  90         if (ret != 2) {
  91                 dprintk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret);
  92                 return -1;
  93         }
  94
  95         return (b1[0] << 8 | b1[1]);
  96 }
  97
  98 static int sp8870_firmware_upload (struct sp8870_state* state, const struct firmware *fw)
  99 {
 100         struct i2c_msg msg;
 101         char *fw_buf = fw->data;
 102         int fw_pos;
 103         u8 tx_buf[255];
 104         int tx_len;
 105         int err = 0;
 106
 107         dprintk ("%s: ...\n", __FUNCTION__);
 108
 109         if (fw->size < SP8870_FIRMWARE_SIZE + SP8870_FIRMWARE_OFFSET)
 110                 return -EINVAL;
 111
 112         // system controller stop
 113         sp8870_writereg(state, 0x0F00, 0x0000);
 114
 115         // instruction RAM register hiword
 116         sp8870_writereg(state, 0x8F08, ((SP8870_FIRMWARE_SIZE / 2) & 0xFFFF));
 117
 118         // instruction RAM MWR
 119         sp8870_writereg(state, 0x8F0A, ((SP8870_FIRMWARE_SIZE / 2) >> 16));
 120
 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
 126                 tx_buf[0] = 0xCF;
 127                 tx_buf[1] = 0x0A;
 128                 memcpy(&tx_buf[2], fw_buf + fw_pos, tx_len);
 129                 msg.addr = state->config->demod_address;
 130                 msg.flags = 0;
 131                 msg.buf = tx_buf;
 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);
 136                         return err;
 137                 }
 138                 fw_pos += tx_len;
 139         }
 140
 141         dprintk ("%s: done!\n", __FUNCTION__);
 142         return 0;
 143 };
 144
 145 static void sp8870_microcontroller_stop (struct sp8870_state* state)
 146 {
 147         sp8870_writereg(state, 0x0F08, 0x000);
 148         sp8870_writereg(state, 0x0F09, 0x000);
 149
 150         // microcontroller STOP
 151         sp8870_writereg(state, 0x0F00, 0x000);
 152 }
 153
 154 static void sp8870_microcontroller_start (struct sp8870_state* state)
 155 {
 156         sp8870_writereg(state, 0x0F08, 0x000);
 157         sp8870_writereg(state, 0x0F09, 0x000);
 158
 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);
 164 }
 165
 166 static int sp8870_read_data_valid_signal(struct sp8870_state* state)
 167 {
 168         return (sp8870_readreg(state, 0x0D02) > 0);
 169 }
 170
 171 static int configure_reg0xc05 (struct dvb_frontend_parameters *p, u16 *reg0xc05)
 172 {
 173         int known_parameters = 1;
 174
 175         *reg0xc05 = 0x000;
 176
 177         switch (p->u.ofdm.constellation) {
 178         case QPSK:
 179                 break;
 180         case QAM_16:
 181                 *reg0xc05 |= (1 << 10);
 182                 break;
 183         case QAM_64:
 184                 *reg0xc05 |= (2 << 10);
 185                 break;
 186         case QAM_AUTO:
 187                 known_parameters = 0;
 188                 break;
 189         default:
 190                 return -EINVAL;
 191         };
 192
 193         switch (p->u.ofdm.hierarchy_information) {
 194         case HIERARCHY_NONE:
 195                 break;
 196         case HIERARCHY_1:
 197                 *reg0xc05 |= (1 << 7);
 198                 break;
 199         case HIERARCHY_2:
 200                 *reg0xc05 |= (2 << 7);
 201                 break;
 202         case HIERARCHY_4:
 203                 *reg0xc05 |= (3 << 7);
 204                 break;
 205         case HIERARCHY_AUTO:
 206                 known_parameters = 0;
 207                 break;
 208         default:
 209                 return -EINVAL;
 210         };
 211
 212         switch (p->u.ofdm.code_rate_HP) {
 213         case FEC_1_2:
 214                 break;
 215         case FEC_2_3:
 216                 *reg0xc05 |= (1 << 3);
 217                 break;
 218         case FEC_3_4:
 219                 *reg0xc05 |= (2 << 3);
 220                 break;
 221         case FEC_5_6:
 222                 *reg0xc05 |= (3 << 3);
 223                 break;
 224         case FEC_7_8:
 225                 *reg0xc05 |= (4 << 3);
 226                 break;
 227         case FEC_AUTO:
 228                 known_parameters = 0;
 229                 break;
 230         default:
 231                 return -EINVAL;
 232         };
 233
 234         if (known_parameters)
 235                 *reg0xc05 |= (2 << 1);  /* use specified parameters */
 236         else
 237                 *reg0xc05 |= (1 << 1);  /* enable autoprobing */
 238
 239         return 0;
 240 }
 241
 242 static int sp8870_wake_up(struct sp8870_state* state)
 243 {
 244         // enable TS output and interface pins
 245         return sp8870_writereg(state, 0xC18, 0x00D);
 246 }
 247
 248 static int sp8870_set_frontend_parameters (struct dvb_frontend* fe,
 249                                            struct dvb_frontend_parameters *p)
 250 {
 251         struct sp8870_state* state = fe->demodulator_priv;
 252         int  err;
 253         u16 reg0xc05;
 254
 255         if ((err = configure_reg0xc05(p, &reg0xc05)))
 256                 return err;
 257
 258         // system controller stop
 259         sp8870_microcontroller_stop(state);
 260
 261         // set tuner parameters
 262         sp8870_writereg(state, 0x206, 0x001);
 263         state->config->pll_set(fe, p);
 264         sp8870_writereg(state, 0x206, 0x000);
 265
 266         // sample rate correction bit [23..17]
 267         sp8870_writereg(state, 0x0319, 0x000A);
 268
 269         // sample rate correction bit [16..0]
 270         sp8870_writereg(state, 0x031A, 0x0AAB);
 271
 272         // integer carrier offset
 273         sp8870_writereg(state, 0x0309, 0x0400);
 274
 275         // fractional carrier offset
 276         sp8870_writereg(state, 0x030A, 0x0000);
 277
 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);
 283         else
 284                 sp8870_writereg(state, 0x0311, 0x0000);
 285
 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);
 289         else
 290                 sp8870_writereg(state, 0x0338, 0x0001);
 291
 292         sp8870_writereg(state, 0xc05, reg0xc05);
 293
 294         // read status reg in order to clear pending irqs
 295         sp8870_readreg(state, 0x200);
 296
 297         // system controller start
 298         sp8870_microcontroller_start(state);
 299
 300         return 0;
 301 }
 302
 303 static int sp8870_init (struct dvb_frontend* fe)
 304 {
 305         struct sp8870_state* state = fe->demodulator_priv;
 306         const struct firmware *fw = NULL;
 307
 308         sp8870_wake_up(state);
 309         if (state->initialised) return 0;
 310         state->initialised = 1;
 311
 312         dprintk ("%s\n", __FUNCTION__);
 313
 314
 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);
 320                 return -EIO;
 321         }
 322
 323         if (sp8870_firmware_upload(state, fw)) {
 324                 printk("sp8870: writing firmware to device failed\n");
 325                 release_firmware(fw);
 326                 return -EIO;
 327         }
 328         printk("sp8870: firmware upload complete\n");
 329
 330         /* enable TS output and interface pins */
 331         sp8870_writereg(state, 0xc18, 0x00d);
 332
 333         // system controller stop
 334         sp8870_microcontroller_stop(state);
 335
 336         // ADC mode
 337         sp8870_writereg(state, 0x0301, 0x0003);
 338
 339         // Reed Solomon parity bytes passed to output
 340         sp8870_writereg(state, 0x0C13, 0x0001);
 341
 342         // MPEG clock is suppressed if no valid data
 343         sp8870_writereg(state, 0x0C14, 0x0001);
 344
 345         /* bit 0x010: enable data valid signal */
 346         sp8870_writereg(state, 0x0D00, 0x010);
 347         sp8870_writereg(state, 0x0D01, 0x000);
 348
 349         /* setup PLL */
 350         if (state->config->pll_init) {
 351                 sp8870_writereg(state, 0x206, 0x001);
 352                 state->config->pll_init(fe);
 353                 sp8870_writereg(state, 0x206, 0x000);
 354         }
 355
 356         return 0;
 357 }
 358
 359 static int sp8870_read_status (struct dvb_frontend* fe, fe_status_t * fe_status)
 360 {
 361         struct sp8870_state* state = fe->demodulator_priv;
 362         int status;
 363         int signal;
 364
 365         *fe_status = 0;
 366
 367         status = sp8870_readreg (state, 0x0200);
 368         if (status < 0)
 369                 return -EIO;
 370
 371         signal = sp8870_readreg (state, 0x0303);
 372         if (signal < 0)
 373                 return -EIO;
 374
 375         if (signal > 0x0F)
 376                 *fe_status |= FE_HAS_SIGNAL;
 377         if (status & 0x08)
 378                 *fe_status |= FE_HAS_SYNC;
 379         if (status & 0x04)
 380                 *fe_status |= FE_HAS_LOCK | FE_HAS_CARRIER | FE_HAS_VITERBI;
 381
 382         return 0;
 383 }
 384
 385 static int sp8870_read_ber (struct dvb_frontend* fe, u32 * ber)
 386 {
 387         struct sp8870_state* state = fe->demodulator_priv;
 388         int ret;
 389         u32 tmp;
 390
 391         *ber = 0;
 392
 393         ret = sp8870_readreg(state, 0xC08);
 394         if (ret < 0)
 395                 return -EIO;
 396
 397         tmp = ret & 0x3F;
 398
 399         ret = sp8870_readreg(state, 0xC07);
 400         if (ret < 0)
 401                 return -EIO;
 402
 403          tmp = ret << 6;
 404
 405         if (tmp >= 0x3FFF0)
 406                 tmp = ~0;
 407
 408         *ber = tmp;
 409
 410         return 0;
 411 }
 412
 413 static int sp8870_read_signal_strength(struct dvb_frontend* fe,  u16 * signal)
 414 {
 415         struct sp8870_state* state = fe->demodulator_priv;
 416         int ret;
 417         u16 tmp;
 418
 419         *signal = 0;
 420
 421         ret = sp8870_readreg (state, 0x306);
 422         if (ret < 0)
 423                 return -EIO;
 424
 425         tmp = ret << 8;
 426
 427         ret = sp8870_readreg (state, 0x303);
 428         if (ret < 0)
 429                 return -EIO;
 430
 431         tmp |= ret;
 432
 433         if (tmp)
 434                 *signal = 0xFFFF - tmp;
 435
 436         return 0;
 437 }
 438
 439 static int sp8870_read_uncorrected_blocks (struct dvb_frontend* fe, u32* ublocks)
 440 {
 441         struct sp8870_state* state = fe->demodulator_priv;
 442         int ret;
 443
 444         *ublocks = 0;
 445
 446         ret = sp8870_readreg(state, 0xC0C);
 447         if (ret < 0)
 448                 return -EIO;
 449
 450         if (ret == 0xFFFF)
 451                 ret = ~0;
 452
 453         *ublocks = ret;
 454
 455         return 0;
 456 }
 457
 458 // number of trials to recover from lockup
 459 #define MAXTRIALS 5
 460 // maximum checks for data valid signal
 461 #define MAXCHECKS 100
 462
 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;
 467
 468 static int sp8870_set_frontend (struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
 469 {
 470         struct sp8870_state* state = fe->demodulator_priv;
 471
 472         /*
 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.
 477         */
 478
 479         int err = 0;
 480         int valid = 0;
 481         int trials = 0;
 482         int check_count = 0;
 483
 484         dprintk("%s: frequency = %i\n", __FUNCTION__, p->frequency);
 485
 486         for (trials = 1; trials <= MAXTRIALS; trials++) {
 487
 488                 if ((err = sp8870_set_frontend_parameters(fe, p)))
 489                         return err;
 490
 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);
 494                         if (valid) {
 495                                 dprintk("%s: delay = %i usec\n",
 496                                         __FUNCTION__, check_count * 10);
 497                                 break;
 498                         }
 499                         udelay(10);
 500                 }
 501                 if (valid)
 502                         break;
 503         }
 504
 505         if (!valid) {
 506                 printk("%s: firmware crash!!!!!!\n", __FUNCTION__);
 507                 return -EIO;
 508         }
 509
 510         if (debug) {
 511                 if (valid) {
 512                         if (trials > 1) {
 513                                 printk("%s: firmware lockup!!!\n", __FUNCTION__);
 514                                 printk("%s: recovered after %i trial(s))\n",  __FUNCTION__, trials - 1);
 515                                 lockups++;
 516                         }
 517                 }
 518                 switches++;
 519                 printk("%s: switches = %i lockups = %i\n", __FUNCTION__, switches, lockups);
 520         }
 521
 522         return 0;
 523 }
 524
 525 static int sp8870_sleep(struct dvb_frontend* fe)
 526 {
 527         struct sp8870_state* state = fe->demodulator_priv;
 528
 529         // tristate TS output and disable interface pins
 530         return sp8870_writereg(state, 0xC18, 0x000);
 531 }
 532
 533 static int sp8870_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
 534 {
 535         fesettings->min_delay_ms = 350;
 536         fesettings->step_size = 0;
 537         fesettings->max_drift = 0;
 538         return 0;
 539 }
 540
 541 static void sp8870_release(struct dvb_frontend* fe)
 542 {
 543         struct sp8870_state* state = fe->demodulator_priv;
 544         kfree(state);
 545 }
 546
 547 static struct dvb_frontend_ops sp8870_ops;
 548
 549 struct dvb_frontend* sp8870_attach(const struct sp8870_config* config,
 550                                    struct i2c_adapter* i2c)
 551 {
 552         struct sp8870_state* state = NULL;
 553
 554         /* allocate memory for the internal state */
 555         state = kmalloc(sizeof(struct sp8870_state), GFP_KERNEL);
 556         if (state == NULL) goto error;
 557
 558         /* setup the state */
 559         state->config = config;
 560         state->i2c = i2c;
 561         memcpy(&state->ops, &sp8870_ops, sizeof(struct dvb_frontend_ops));
 562         state->initialised = 0;
 563
 564         /* check if the demod is there */
 565         if (sp8870_readreg(state, 0x0200) < 0) goto error;
 566
 567         /* create dvb_frontend */
 568         state->frontend.ops = &state->ops;
 569         state->frontend.demodulator_priv = state;
 570         return &state->frontend;
 571
 572 error:
 573         kfree(state);
 574         return NULL;
 575 }
 576
 577 static struct dvb_frontend_ops sp8870_ops = {
 578
 579         .info = {
 580                 .name                   = "Spase SP8870 DVB-T",
 581                 .type                   = FE_OFDM,
 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
 591         },
 592
 593         .release = sp8870_release,
 594
 595         .init = sp8870_init,
 596         .sleep = sp8870_sleep,
 597
 598         .set_frontend = sp8870_set_frontend,
 599         .get_tune_settings = sp8870_get_tune_settings,
 600
 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,
 605 };
 606
 607 module_param(debug, int, 0644);
 608 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 609
 610 MODULE_DESCRIPTION("Spase SP8870 DVB-T Demodulator driver");
 611 MODULE_AUTHOR("Juergen Peitz");
 612 MODULE_LICENSE("GPL");
 613
 614 EXPORT_SYMBOL(sp8870_attach);