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stb0899_algo.c
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stb0899_algo.c
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/*
STB0899 Multistandard Frontend driver
Copyright (C) Manu Abraham (abraham.manu@gmail.com)
Copyright (C) ST Microelectronics
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.
*/
#include <linux/bitops.h>
#include <linux/timer.h>
#include "stb0899_drv.h"
#include "stb0899_priv.h"
#include "stb0899_reg.h"
static inline u32 stb0899_do_div(u64 n, u32 d)
{
/* wrap do_div() for ease of use */
do_div(n, d);
return n;
}
#if 0
/* These functions are currently unused */
/*
* stb0899_calc_srate
* Compute symbol rate
*/
static u32 stb0899_calc_srate(u32 master_clk, u8 *sfr)
{
u64 tmp;
/* srate = (SFR * master_clk) >> 20 */
/* sfr is of size 20 bit, stored with an offset of 4 bit */
tmp = (((u32)sfr[0]) << 16) | (((u32)sfr[1]) << 8) | sfr[2];
tmp &= ~0xf;
tmp *= master_clk;
tmp >>= 24;
return tmp;
}
/*
* stb0899_get_srate
* Get the current symbol rate
*/
static u32 stb0899_get_srate(struct stb0899_state *state)
{
struct stb0899_internal *internal = &state->internal;
u8 sfr[3];
stb0899_read_regs(state, STB0899_SFRH, sfr, 3);
return stb0899_calc_srate(internal->master_clk, sfr);
}
#endif
/*
* stb0899_set_srate
* Set symbol frequency
* MasterClock: master clock frequency (hz)
* SymbolRate: symbol rate (bauds)
* return symbol frequency
*/
static u32 stb0899_set_srate(struct stb0899_state *state, u32 master_clk, u32 srate)
{
u32 tmp;
u8 sfr[3];
dprintk(state->verbose, FE_DEBUG, 1, "-->");
/*
* in order to have the maximum precision, the symbol rate entered into
* the chip is computed as the closest value of the "true value".
* In this purpose, the symbol rate value is rounded (1 is added on the bit
* below the LSB )
*
* srate = (SFR * master_clk) >> 20
* <=>
* SFR = srate << 20 / master_clk
*
* rounded:
* SFR = (srate << 21 + master_clk) / (2 * master_clk)
*
* stored as 20 bit number with an offset of 4 bit:
* sfr = SFR << 4;
*/
tmp = stb0899_do_div((((u64)srate) << 21) + master_clk, 2 * master_clk);
tmp <<= 4;
sfr[0] = tmp >> 16;
sfr[1] = tmp >> 8;
sfr[2] = tmp;
stb0899_write_regs(state, STB0899_SFRH, sfr, 3);
return srate;
}
/*
* stb0899_calc_derot_time
* Compute the amount of time needed by the derotator to lock
* SymbolRate: Symbol rate
* return: derotator time constant (ms)
*/
static long stb0899_calc_derot_time(long srate)
{
if (srate > 0)
return (100000 / (srate / 1000));
else
return 0;
}
/*
* stb0899_carr_width
* Compute the width of the carrier
* return: width of carrier (kHz or Mhz)
*/
long stb0899_carr_width(struct stb0899_state *state)
{
struct stb0899_internal *internal = &state->internal;
return (internal->srate + (internal->srate * internal->rolloff) / 100);
}
/*
* stb0899_first_subrange
* Compute the first subrange of the search
*/
static void stb0899_first_subrange(struct stb0899_state *state)
{
struct stb0899_internal *internal = &state->internal;
struct stb0899_params *params = &state->params;
struct stb0899_config *config = state->config;
int range = 0;
u32 bandwidth = 0;
if (config->tuner_get_bandwidth) {
stb0899_i2c_gate_ctrl(&state->frontend, 1);
config->tuner_get_bandwidth(&state->frontend, &bandwidth);
stb0899_i2c_gate_ctrl(&state->frontend, 0);
range = bandwidth - stb0899_carr_width(state) / 2;
}
if (range > 0)
internal->sub_range = min(internal->srch_range, range);
else
internal->sub_range = 0;
internal->freq = params->freq;
internal->tuner_offst = 0L;
internal->sub_dir = 1;
}
/*
* stb0899_check_tmg
* check for timing lock
* internal.Ttiming: time to wait for loop lock
*/
static enum stb0899_status stb0899_check_tmg(struct stb0899_state *state)
{
struct stb0899_internal *internal = &state->internal;
int lock;
u8 reg;
s8 timing;
msleep(internal->t_derot);
stb0899_write_reg(state, STB0899_RTF, 0xf2);
reg = stb0899_read_reg(state, STB0899_TLIR);
lock = STB0899_GETFIELD(TLIR_TMG_LOCK_IND, reg);
timing = stb0899_read_reg(state, STB0899_RTF);
if (lock >= 42) {
if ((lock > 48) && (abs(timing) >= 110)) {
internal->status = ANALOGCARRIER;
dprintk(state->verbose, FE_DEBUG, 1, "-->ANALOG Carrier !");
} else {
internal->status = TIMINGOK;
dprintk(state->verbose, FE_DEBUG, 1, "------->TIMING OK !");
}
} else {
internal->status = NOTIMING;
dprintk(state->verbose, FE_DEBUG, 1, "-->NO TIMING !");
}
return internal->status;
}
/*
* stb0899_search_tmg
* perform a fs/2 zig-zag to find timing
*/
static enum stb0899_status stb0899_search_tmg(struct stb0899_state *state)
{
struct stb0899_internal *internal = &state->internal;
struct stb0899_params *params = &state->params;
short int derot_step, derot_freq = 0, derot_limit, next_loop = 3;
int index = 0;
u8 cfr[2];
internal->status = NOTIMING;
/* timing loop computation & symbol rate optimisation */
derot_limit = (internal->sub_range / 2L) / internal->mclk;
derot_step = (params->srate / 2L) / internal->mclk;
while ((stb0899_check_tmg(state) != TIMINGOK) && next_loop) {
index++;
derot_freq += index * internal->direction * derot_step; /* next derot zig zag position */
if (abs(derot_freq) > derot_limit)
next_loop--;
if (next_loop) {
STB0899_SETFIELD_VAL(CFRM, cfr[0], MSB(internal->inversion * derot_freq));
STB0899_SETFIELD_VAL(CFRL, cfr[1], LSB(internal->inversion * derot_freq));
stb0899_write_regs(state, STB0899_CFRM, cfr, 2); /* derotator frequency */
}
internal->direction = -internal->direction; /* Change zigzag direction */
}
if (internal->status == TIMINGOK) {
stb0899_read_regs(state, STB0899_CFRM, cfr, 2); /* get derotator frequency */
internal->derot_freq = internal->inversion * MAKEWORD16(cfr[0], cfr[1]);
dprintk(state->verbose, FE_DEBUG, 1, "------->TIMING OK ! Derot Freq = %d", internal->derot_freq);
}
return internal->status;
}
/*
* stb0899_check_carrier
* Check for carrier found
*/
static enum stb0899_status stb0899_check_carrier(struct stb0899_state *state)
{
struct stb0899_internal *internal = &state->internal;
u8 reg;
msleep(internal->t_derot); /* wait for derotator ok */
reg = stb0899_read_reg(state, STB0899_CFD);
STB0899_SETFIELD_VAL(CFD_ON, reg, 1);
stb0899_write_reg(state, STB0899_CFD, reg);
reg = stb0899_read_reg(state, STB0899_DSTATUS);
dprintk(state->verbose, FE_DEBUG, 1, "--------------------> STB0899_DSTATUS=[0x%02x]", reg);
if (STB0899_GETFIELD(CARRIER_FOUND, reg)) {
internal->status = CARRIEROK;
dprintk(state->verbose, FE_DEBUG, 1, "-------------> CARRIEROK !");
} else {
internal->status = NOCARRIER;
dprintk(state->verbose, FE_DEBUG, 1, "-------------> NOCARRIER !");
}
return internal->status;
}
/*
* stb0899_search_carrier
* Search for a QPSK carrier with the derotator
*/
static enum stb0899_status stb0899_search_carrier(struct stb0899_state *state)
{
struct stb0899_internal *internal = &state->internal;
short int derot_freq = 0, last_derot_freq = 0, derot_limit, next_loop = 3;
int index = 0;
u8 cfr[2];
u8 reg;
internal->status = NOCARRIER;
derot_limit = (internal->sub_range / 2L) / internal->mclk;
derot_freq = internal->derot_freq;
reg = stb0899_read_reg(state, STB0899_CFD);
STB0899_SETFIELD_VAL(CFD_ON, reg, 1);
stb0899_write_reg(state, STB0899_CFD, reg);
do {
dprintk(state->verbose, FE_DEBUG, 1, "Derot Freq=%d, mclk=%d", derot_freq, internal->mclk);
if (stb0899_check_carrier(state) == NOCARRIER) {
index++;
last_derot_freq = derot_freq;
derot_freq += index * internal->direction * internal->derot_step; /* next zig zag derotator position */
if(abs(derot_freq) > derot_limit)
next_loop--;
if (next_loop) {
reg = stb0899_read_reg(state, STB0899_CFD);
STB0899_SETFIELD_VAL(CFD_ON, reg, 1);
stb0899_write_reg(state, STB0899_CFD, reg);
STB0899_SETFIELD_VAL(CFRM, cfr[0], MSB(internal->inversion * derot_freq));
STB0899_SETFIELD_VAL(CFRL, cfr[1], LSB(internal->inversion * derot_freq));
stb0899_write_regs(state, STB0899_CFRM, cfr, 2); /* derotator frequency */
}
}
internal->direction = -internal->direction; /* Change zigzag direction */
} while ((internal->status != CARRIEROK) && next_loop);
if (internal->status == CARRIEROK) {
stb0899_read_regs(state, STB0899_CFRM, cfr, 2); /* get derotator frequency */
internal->derot_freq = internal->inversion * MAKEWORD16(cfr[0], cfr[1]);
dprintk(state->verbose, FE_DEBUG, 1, "----> CARRIER OK !, Derot Freq=%d", internal->derot_freq);
} else {
internal->derot_freq = last_derot_freq;
}
return internal->status;
}
/*
* stb0899_check_data
* Check for data found
*/
static enum stb0899_status stb0899_check_data(struct stb0899_state *state)
{
struct stb0899_internal *internal = &state->internal;
struct stb0899_params *params = &state->params;
int lock = 0, index = 0, dataTime = 500, loop;
u8 reg;
internal->status = NODATA;
/* RESET FEC */
reg = stb0899_read_reg(state, STB0899_TSTRES);
STB0899_SETFIELD_VAL(FRESACS, reg, 1);
stb0899_write_reg(state, STB0899_TSTRES, reg);
msleep(1);
reg = stb0899_read_reg(state, STB0899_TSTRES);
STB0899_SETFIELD_VAL(FRESACS, reg, 0);
stb0899_write_reg(state, STB0899_TSTRES, reg);
if (params->srate <= 2000000)
dataTime = 2000;
else if (params->srate <= 5000000)
dataTime = 1500;
else if (params->srate <= 15000000)
dataTime = 1000;
else
dataTime = 500;
/* clear previous failed END_LOOPVIT */
stb0899_read_reg(state, STB0899_VSTATUS);
stb0899_write_reg(state, STB0899_DSTATUS2, 0x00); /* force search loop */
while (1) {
/* WARNING! VIT LOCKED has to be tested before VIT_END_LOOOP */
reg = stb0899_read_reg(state, STB0899_VSTATUS);
lock = STB0899_GETFIELD(VSTATUS_LOCKEDVIT, reg);
loop = STB0899_GETFIELD(VSTATUS_END_LOOPVIT, reg);
if (lock || loop || (index > dataTime))
break;
index++;
}
if (lock) { /* DATA LOCK indicator */
internal->status = DATAOK;
dprintk(state->verbose, FE_DEBUG, 1, "-----------------> DATA OK !");
}
return internal->status;
}
/*
* stb0899_search_data
* Search for a QPSK carrier with the derotator
*/
static enum stb0899_status stb0899_search_data(struct stb0899_state *state)
{
short int derot_freq, derot_step, derot_limit, next_loop = 3;
u8 cfr[2];
u8 reg;
int index = 1;
struct stb0899_internal *internal = &state->internal;
struct stb0899_params *params = &state->params;
derot_step = (params->srate / 4L) / internal->mclk;
derot_limit = (internal->sub_range / 2L) / internal->mclk;
derot_freq = internal->derot_freq;
do {
if ((internal->status != CARRIEROK) || (stb0899_check_data(state) != DATAOK)) {
derot_freq += index * internal->direction * derot_step; /* next zig zag derotator position */
if (abs(derot_freq) > derot_limit)
next_loop--;
if (next_loop) {
dprintk(state->verbose, FE_DEBUG, 1, "Derot freq=%d, mclk=%d", derot_freq, internal->mclk);
reg = stb0899_read_reg(state, STB0899_CFD);
STB0899_SETFIELD_VAL(CFD_ON, reg, 1);
stb0899_write_reg(state, STB0899_CFD, reg);
STB0899_SETFIELD_VAL(CFRM, cfr[0], MSB(internal->inversion * derot_freq));
STB0899_SETFIELD_VAL(CFRL, cfr[1], LSB(internal->inversion * derot_freq));
stb0899_write_regs(state, STB0899_CFRM, cfr, 2); /* derotator frequency */
stb0899_check_carrier(state);
index++;
}
}
internal->direction = -internal->direction; /* change zig zag direction */
} while ((internal->status != DATAOK) && next_loop);
if (internal->status == DATAOK) {
stb0899_read_regs(state, STB0899_CFRM, cfr, 2); /* get derotator frequency */
/* store autodetected IQ swapping as default for DVB-S2 tuning */
reg = stb0899_read_reg(state, STB0899_IQSWAP);
if (STB0899_GETFIELD(SYM, reg))
internal->inversion = IQ_SWAP_ON;
else
internal->inversion = IQ_SWAP_OFF;
internal->derot_freq = internal->inversion * MAKEWORD16(cfr[0], cfr[1]);
dprintk(state->verbose, FE_DEBUG, 1, "------> DATAOK ! Derot Freq=%d", internal->derot_freq);
}
return internal->status;
}
/*
* stb0899_check_range
* check if the found frequency is in the correct range
*/
static enum stb0899_status stb0899_check_range(struct stb0899_state *state)
{
struct stb0899_internal *internal = &state->internal;
struct stb0899_params *params = &state->params;
int range_offst, tp_freq;
range_offst = internal->srch_range / 2000;
tp_freq = internal->freq - (internal->derot_freq * internal->mclk) / 1000;
if ((tp_freq >= params->freq - range_offst) && (tp_freq <= params->freq + range_offst)) {
internal->status = RANGEOK;
dprintk(state->verbose, FE_DEBUG, 1, "----> RANGEOK !");
} else {
internal->status = OUTOFRANGE;
dprintk(state->verbose, FE_DEBUG, 1, "----> OUT OF RANGE !");
}
return internal->status;
}
/*
* NextSubRange
* Compute the next subrange of the search
*/
static void next_sub_range(struct stb0899_state *state)
{
struct stb0899_internal *internal = &state->internal;
struct stb0899_params *params = &state->params;
long old_sub_range;
if (internal->sub_dir > 0) {
old_sub_range = internal->sub_range;
internal->sub_range = min((internal->srch_range / 2) -
(internal->tuner_offst + internal->sub_range / 2),
internal->sub_range);
if (internal->sub_range < 0)
internal->sub_range = 0;
internal->tuner_offst += (old_sub_range + internal->sub_range) / 2;
}
internal->freq = params->freq + (internal->sub_dir * internal->tuner_offst) / 1000;
internal->sub_dir = -internal->sub_dir;
}
/*
* stb0899_dvbs_algo
* Search for a signal, timing, carrier and data for a
* given frequency in a given range
*/
enum stb0899_status stb0899_dvbs_algo(struct stb0899_state *state)
{
struct stb0899_params *params = &state->params;
struct stb0899_internal *internal = &state->internal;
struct stb0899_config *config = state->config;
u8 bclc, reg;
u8 cfr[2];
u8 eq_const[10];
s32 clnI = 3;
u32 bandwidth = 0;
/* BETA values rated @ 99MHz */
s32 betaTab[5][4] = {
/* 5 10 20 30MBps */
{ 37, 34, 32, 31 }, /* QPSK 1/2 */
{ 37, 35, 33, 31 }, /* QPSK 2/3 */
{ 37, 35, 33, 31 }, /* QPSK 3/4 */
{ 37, 36, 33, 32 }, /* QPSK 5/6 */
{ 37, 36, 33, 32 } /* QPSK 7/8 */
};
internal->direction = 1;
stb0899_set_srate(state, internal->master_clk, params->srate);
/* Carrier loop optimization versus symbol rate for acquisition*/
if (params->srate <= 5000000) {
stb0899_write_reg(state, STB0899_ACLC, 0x89);
bclc = stb0899_read_reg(state, STB0899_BCLC);
STB0899_SETFIELD_VAL(BETA, bclc, 0x1c);
stb0899_write_reg(state, STB0899_BCLC, bclc);
clnI = 0;
} else if (params->srate <= 15000000) {
stb0899_write_reg(state, STB0899_ACLC, 0xc9);
bclc = stb0899_read_reg(state, STB0899_BCLC);
STB0899_SETFIELD_VAL(BETA, bclc, 0x22);
stb0899_write_reg(state, STB0899_BCLC, bclc);
clnI = 1;
} else if(params->srate <= 25000000) {
stb0899_write_reg(state, STB0899_ACLC, 0x89);
bclc = stb0899_read_reg(state, STB0899_BCLC);
STB0899_SETFIELD_VAL(BETA, bclc, 0x27);
stb0899_write_reg(state, STB0899_BCLC, bclc);
clnI = 2;
} else {
stb0899_write_reg(state, STB0899_ACLC, 0xc8);
bclc = stb0899_read_reg(state, STB0899_BCLC);
STB0899_SETFIELD_VAL(BETA, bclc, 0x29);
stb0899_write_reg(state, STB0899_BCLC, bclc);
clnI = 3;
}
dprintk(state->verbose, FE_DEBUG, 1, "Set the timing loop to acquisition");
/* Set the timing loop to acquisition */
stb0899_write_reg(state, STB0899_RTC, 0x46);
stb0899_write_reg(state, STB0899_CFD, 0xee);
/* !! WARNING !!
* Do not read any status variables while acquisition,
* If any needed, read before the acquisition starts
* querying status while acquiring causes the
* acquisition to go bad and hence no locks.
*/
dprintk(state->verbose, FE_DEBUG, 1, "Derot Percent=%d Srate=%d mclk=%d",
internal->derot_percent, params->srate, internal->mclk);
/* Initial calculations */
internal->derot_step = internal->derot_percent * (params->srate / 1000L) / internal->mclk; /* DerotStep/1000 * Fsymbol */
internal->t_derot = stb0899_calc_derot_time(params->srate);
internal->t_data = 500;
dprintk(state->verbose, FE_DEBUG, 1, "RESET stream merger");
/* RESET Stream merger */
reg = stb0899_read_reg(state, STB0899_TSTRES);
STB0899_SETFIELD_VAL(FRESRS, reg, 1);
stb0899_write_reg(state, STB0899_TSTRES, reg);
/*
* Set KDIVIDER to an intermediate value between
* 1/2 and 7/8 for acquisition
*/
reg = stb0899_read_reg(state, STB0899_DEMAPVIT);
STB0899_SETFIELD_VAL(DEMAPVIT_KDIVIDER, reg, 60);
stb0899_write_reg(state, STB0899_DEMAPVIT, reg);
stb0899_write_reg(state, STB0899_EQON, 0x01); /* Equalizer OFF while acquiring */
stb0899_write_reg(state, STB0899_VITSYNC, 0x19);
stb0899_first_subrange(state);
do {
/* Initialisations */
cfr[0] = cfr[1] = 0;
stb0899_write_regs(state, STB0899_CFRM, cfr, 2); /* RESET derotator frequency */
stb0899_write_reg(state, STB0899_RTF, 0);
reg = stb0899_read_reg(state, STB0899_CFD);
STB0899_SETFIELD_VAL(CFD_ON, reg, 1);
stb0899_write_reg(state, STB0899_CFD, reg);
internal->derot_freq = 0;
internal->status = NOAGC1;
/* enable tuner I/O */
stb0899_i2c_gate_ctrl(&state->frontend, 1);
/* Move tuner to frequency */
dprintk(state->verbose, FE_DEBUG, 1, "Tuner set frequency");
if (state->config->tuner_set_frequency)
state->config->tuner_set_frequency(&state->frontend, internal->freq);
if (state->config->tuner_get_frequency)
state->config->tuner_get_frequency(&state->frontend, &internal->freq);
msleep(internal->t_agc1 + internal->t_agc2 + internal->t_derot); /* AGC1, AGC2 and timing loop */
dprintk(state->verbose, FE_DEBUG, 1, "current derot freq=%d", internal->derot_freq);
internal->status = AGC1OK;
/* There is signal in the band */
if (config->tuner_get_bandwidth)
config->tuner_get_bandwidth(&state->frontend, &bandwidth);
/* disable tuner I/O */
stb0899_i2c_gate_ctrl(&state->frontend, 0);
if (params->srate <= bandwidth / 2)
stb0899_search_tmg(state); /* For low rates (SCPC) */
else
stb0899_check_tmg(state); /* For high rates (MCPC) */
if (internal->status == TIMINGOK) {
dprintk(state->verbose, FE_DEBUG, 1,
"TIMING OK ! Derot freq=%d, mclk=%d",
internal->derot_freq, internal->mclk);
if (stb0899_search_carrier(state) == CARRIEROK) { /* Search for carrier */
dprintk(state->verbose, FE_DEBUG, 1,
"CARRIER OK ! Derot freq=%d, mclk=%d",
internal->derot_freq, internal->mclk);
if (stb0899_search_data(state) == DATAOK) { /* Check for data */
dprintk(state->verbose, FE_DEBUG, 1,
"DATA OK ! Derot freq=%d, mclk=%d",
internal->derot_freq, internal->mclk);
if (stb0899_check_range(state) == RANGEOK) {
dprintk(state->verbose, FE_DEBUG, 1,
"RANGE OK ! derot freq=%d, mclk=%d",
internal->derot_freq, internal->mclk);
internal->freq = params->freq - ((internal->derot_freq * internal->mclk) / 1000);
reg = stb0899_read_reg(state, STB0899_PLPARM);
internal->fecrate = STB0899_GETFIELD(VITCURPUN, reg);
dprintk(state->verbose, FE_DEBUG, 1,
"freq=%d, internal resultant freq=%d",
params->freq, internal->freq);
dprintk(state->verbose, FE_DEBUG, 1,
"internal puncture rate=%d",
internal->fecrate);
}
}
}
}
if (internal->status != RANGEOK)
next_sub_range(state);
} while (internal->sub_range && internal->status != RANGEOK);
/* Set the timing loop to tracking */
stb0899_write_reg(state, STB0899_RTC, 0x33);
stb0899_write_reg(state, STB0899_CFD, 0xf7);
/* if locked and range ok, set Kdiv */
if (internal->status == RANGEOK) {
dprintk(state->verbose, FE_DEBUG, 1, "Locked & Range OK !");
stb0899_write_reg(state, STB0899_EQON, 0x41); /* Equalizer OFF while acquiring */
stb0899_write_reg(state, STB0899_VITSYNC, 0x39); /* SN to b'11 for acquisition */
/*
* Carrier loop optimization versus
* symbol Rate/Puncture Rate for Tracking
*/
reg = stb0899_read_reg(state, STB0899_BCLC);
switch (internal->fecrate) {
case STB0899_FEC_1_2: /* 13 */
stb0899_write_reg(state, STB0899_DEMAPVIT, 0x1a);
STB0899_SETFIELD_VAL(BETA, reg, betaTab[0][clnI]);
stb0899_write_reg(state, STB0899_BCLC, reg);
break;
case STB0899_FEC_2_3: /* 18 */
stb0899_write_reg(state, STB0899_DEMAPVIT, 44);
STB0899_SETFIELD_VAL(BETA, reg, betaTab[1][clnI]);
stb0899_write_reg(state, STB0899_BCLC, reg);
break;
case STB0899_FEC_3_4: /* 21 */
stb0899_write_reg(state, STB0899_DEMAPVIT, 60);
STB0899_SETFIELD_VAL(BETA, reg, betaTab[2][clnI]);
stb0899_write_reg(state, STB0899_BCLC, reg);
break;
case STB0899_FEC_5_6: /* 24 */
stb0899_write_reg(state, STB0899_DEMAPVIT, 75);
STB0899_SETFIELD_VAL(BETA, reg, betaTab[3][clnI]);
stb0899_write_reg(state, STB0899_BCLC, reg);
break;
case STB0899_FEC_6_7: /* 25 */
stb0899_write_reg(state, STB0899_DEMAPVIT, 88);
stb0899_write_reg(state, STB0899_ACLC, 0x88);
stb0899_write_reg(state, STB0899_BCLC, 0x9a);
break;
case STB0899_FEC_7_8: /* 26 */
stb0899_write_reg(state, STB0899_DEMAPVIT, 94);
STB0899_SETFIELD_VAL(BETA, reg, betaTab[4][clnI]);
stb0899_write_reg(state, STB0899_BCLC, reg);
break;
default:
dprintk(state->verbose, FE_DEBUG, 1, "Unsupported Puncture Rate");
break;
}
/* release stream merger RESET */
reg = stb0899_read_reg(state, STB0899_TSTRES);
STB0899_SETFIELD_VAL(FRESRS, reg, 0);
stb0899_write_reg(state, STB0899_TSTRES, reg);
/* disable carrier detector */
reg = stb0899_read_reg(state, STB0899_CFD);
STB0899_SETFIELD_VAL(CFD_ON, reg, 0);
stb0899_write_reg(state, STB0899_CFD, reg);
stb0899_read_regs(state, STB0899_EQUAI1, eq_const, 10);
}
return internal->status;
}
/*
* stb0899_dvbs2_config_uwp
* Configure UWP state machine
*/
static void stb0899_dvbs2_config_uwp(struct stb0899_state *state)
{
struct stb0899_internal *internal = &state->internal;
struct stb0899_config *config = state->config;
u32 uwp1, uwp2, uwp3 ;
uwp1 = 0;
uwp2 = 0;
uwp3 = 0;
STB0899_SETFIELD_VAL(UWP_ESN0_AVE, uwp1, config->esno_ave);
STB0899_SETFIELD_VAL(UWP_ESN0_QUANT, uwp1, config->esno_quant);
STB0899_SETFIELD_VAL(UWP_TH_SOF, uwp1, config->uwp_threshold_sof);
STB0899_SETFIELD_VAL(FE_COARSE_TRK, uwp2, internal->av_frame_coarse);
STB0899_SETFIELD_VAL(FE_FINE_TRK, uwp2, internal->av_frame_fine);
STB0899_SETFIELD_VAL(UWP_MISS_TH, uwp2, config->miss_threshold);
STB0899_SETFIELD_VAL(UWP_TH_ACQ, uwp3, config->uwp_threshold_acq);
STB0899_SETFIELD_VAL(UWP_TH_TRACK, uwp3, config->uwp_threshold_track);
stb0899_write_s2reg(state, STB0899_S2DEMOD, STB0899_BASE_UWP_CNTRL1, STB0899_OFF0_UWP_CNTRL1, uwp1);
stb0899_write_s2reg(state, STB0899_S2DEMOD, STB0899_BASE_UWP_CNTRL2, STB0899_OFF0_UWP_CNTRL2, uwp2);
stb0899_write_s2reg(state, STB0899_S2DEMOD, STB0899_BASE_UWP_CNTRL3, STB0899_OFF0_UWP_CNTRL3, uwp3);
stb0899_write_s2reg(state, STB0899_S2DEMOD, STB0899_BASE_SOF_SRCH_TO, STB0899_OFF0_SOF_SRCH_TO, config->sof_search_timeout);
}
/*
* stb0899_dvbs2_config_csm_auto
* Set CSM to AUTO mode
*/
static void stb0899_dvbs2_config_csm_auto(struct stb0899_state *state)
{
u32 reg;
reg = 0x00020019; // STB0899_READ_S2REG(STB0899_S2DEMOD, CSM_CNTRL1);
STB0899_SETFIELD_VAL(CSM_AUTO_PARAM, reg, 1);
stb0899_write_s2reg(state, STB0899_S2DEMOD, STB0899_BASE_CSM_CNTRL1, STB0899_OFF0_CSM_CNTRL1, reg);
}
static long Log2Int(int number)
{
int i;
i = 0;
while ((1 << i) <= abs(number))
i++;
if (number == 0)
i = 1;
return i - 1;
}
/*
* stb0899_dvbs2_calc_srate
* compute BTR_NOM_FREQ for the symbol rate
*/
static u32 stb0899_dvbs2_calc_srate(struct stb0899_state *state)
{
struct stb0899_internal *internal = &state->internal;
struct stb0899_config *config = state->config;
u32 dec_ratio, dec_rate, decim, remain, intval, btr_nom_freq;
u32 master_clk, srate;
dec_ratio = (internal->master_clk * 2) / (5 * internal->srate);
dec_ratio = (dec_ratio == 0) ? 1 : dec_ratio;
dec_rate = Log2Int(dec_ratio);
decim = 1 << dec_rate;
master_clk = internal->master_clk / 1000;
srate = internal->srate / 1000;
if (decim <= 4) {
intval = (decim * (1 << (config->btr_nco_bits - 1))) / master_clk;
remain = (decim * (1 << (config->btr_nco_bits - 1))) % master_clk;
} else {
intval = (1 << (config->btr_nco_bits - 1)) / (master_clk / 100) * decim / 100;
remain = (decim * (1 << (config->btr_nco_bits - 1))) % master_clk;
}
btr_nom_freq = (intval * srate) + ((remain * srate) / master_clk);
return btr_nom_freq;
}
/*
* stb0899_dvbs2_calc_dev
* compute the correction to be applied to symbol rate
*/
static u32 stb0899_dvbs2_calc_dev(struct stb0899_state *state)
{
struct stb0899_internal *internal = &state->internal;
u32 dec_ratio, correction, master_clk, srate;
dec_ratio = (internal->master_clk * 2) / (5 * internal->srate);
dec_ratio = (dec_ratio == 0) ? 1 : dec_ratio;
master_clk = internal->master_clk / 1000; /* for integer Caculation*/
srate = internal->srate / 1000; /* for integer Caculation*/
correction = (512 * master_clk) / (2 * dec_ratio * srate);
return correction;
}
/*
* stb0899_dvbs2_set_srate
* Set DVBS2 symbol rate
*/
static void stb0899_dvbs2_set_srate(struct stb0899_state *state)
{
struct stb0899_internal *internal = &state->internal;
u32 dec_ratio, dec_rate, win_sel, decim, f_sym, btr_nom_freq;
u32 correction, freq_adj, band_lim, decim_cntrl, reg;
u8 anti_alias;
/*set decimation to 1*/
dec_ratio = (internal->master_clk * 2) / (5 * internal->srate);
dec_ratio = (dec_ratio == 0) ? 1 : dec_ratio;
dec_rate = Log2Int(dec_ratio);
win_sel = 0;
if (dec_rate >= 5)
win_sel = dec_rate - 4;
decim = (1 << dec_rate);
/* (FSamp/Fsymbol *100) for integer Caculation */
f_sym = internal->master_clk / ((decim * internal->srate) / 1000);
if (f_sym <= 2250) /* don't band limit signal going into btr block*/
band_lim = 1;
else
band_lim = 0; /* band limit signal going into btr block*/
decim_cntrl = ((win_sel << 3) & 0x18) + ((band_lim << 5) & 0x20) + (dec_rate & 0x7);
stb0899_write_s2reg(state, STB0899_S2DEMOD, STB0899_BASE_DECIM_CNTRL, STB0899_OFF0_DECIM_CNTRL, decim_cntrl);
if (f_sym <= 3450)
anti_alias = 0;
else if (f_sym <= 4250)
anti_alias = 1;
else
anti_alias = 2;
stb0899_write_s2reg(state, STB0899_S2DEMOD, STB0899_BASE_ANTI_ALIAS_SEL, STB0899_OFF0_ANTI_ALIAS_SEL, anti_alias);
btr_nom_freq = stb0899_dvbs2_calc_srate(state);
stb0899_write_s2reg(state, STB0899_S2DEMOD, STB0899_BASE_BTR_NOM_FREQ, STB0899_OFF0_BTR_NOM_FREQ, btr_nom_freq);
correction = stb0899_dvbs2_calc_dev(state);
reg = STB0899_READ_S2REG(STB0899_S2DEMOD, BTR_CNTRL);
STB0899_SETFIELD_VAL(BTR_FREQ_CORR, reg, correction);
stb0899_write_s2reg(state, STB0899_S2DEMOD, STB0899_BASE_BTR_CNTRL, STB0899_OFF0_BTR_CNTRL, reg);
/* scale UWP+CSM frequency to sample rate*/
freq_adj = internal->srate / (internal->master_clk / 4096);
stb0899_write_s2reg(state, STB0899_S2DEMOD, STB0899_BASE_FREQ_ADJ_SCALE, STB0899_OFF0_FREQ_ADJ_SCALE, freq_adj);
}
/*
* stb0899_dvbs2_set_btr_loopbw
* set bit timing loop bandwidth as a percentage of the symbol rate
*/
static void stb0899_dvbs2_set_btr_loopbw(struct stb0899_state *state)
{
struct stb0899_internal *internal = &state->internal;
struct stb0899_config *config = state->config;
u32 sym_peak = 23, zeta = 707, loopbw_percent = 60;
s32 dec_ratio, dec_rate, k_btr1_rshft, k_btr1, k_btr0_rshft;
s32 k_btr0, k_btr2_rshft, k_direct_shift, k_indirect_shift;
u32 decim, K, wn, k_direct, k_indirect;
u32 reg;
dec_ratio = (internal->master_clk * 2) / (5 * internal->srate);
dec_ratio = (dec_ratio == 0) ? 1 : dec_ratio;
dec_rate = Log2Int(dec_ratio);
decim = (1 << dec_rate);
sym_peak *= 576000;
K = (1 << config->btr_nco_bits) / (internal->master_clk / 1000);
K *= (internal->srate / 1000000) * decim; /*k=k 10^-8*/
if (K != 0) {
K = sym_peak / K;
wn = (4 * zeta * zeta) + 1000000;
wn = (2 * (loopbw_percent * 1000) * 40 * zeta) /wn; /*wn =wn 10^-8*/
k_indirect = (wn * wn) / K;
k_indirect = k_indirect; /*kindirect = kindirect 10^-6*/ // not need
k_direct = (2 * wn * zeta) / K; /*kDirect = kDirect 10^-2*/
k_direct *= 100;
k_direct_shift = Log2Int(k_direct) - Log2Int(10000) - 2;
k_btr1_rshft = (-1 * k_direct_shift) + config->btr_gain_shift_offset;
k_btr1 = k_direct / (1 << k_direct_shift);
k_btr1 /= 10000;
k_indirect_shift = Log2Int(k_indirect + 15) - 20 /*- 2*/;
k_btr0_rshft = (-1 * k_indirect_shift) + config->btr_gain_shift_offset;
k_btr0 = k_indirect * (1 << (-k_indirect_shift));
k_btr0 /= 1000000;
k_btr2_rshft = 0;
if (k_btr0_rshft > 15) {
k_btr2_rshft = k_btr0_rshft - 15;
k_btr0_rshft = 15;
}
reg = 0;
STB0899_SETFIELD_VAL(KBTR0_RSHFT, reg, k_btr0_rshft);
STB0899_SETFIELD_VAL(KBTR0, reg, k_btr0);
STB0899_SETFIELD_VAL(KBTR1_RSHFT, reg, k_btr1_rshft);
STB0899_SETFIELD_VAL(KBTR1, reg, k_btr1);
STB0899_SETFIELD_VAL(KBTR2_RSHFT, reg, k_btr2_rshft);
stb0899_write_s2reg(state, STB0899_S2DEMOD, STB0899_BASE_BTR_LOOP_GAIN, STB0899_OFF0_BTR_LOOP_GAIN, reg);
} else
stb0899_write_s2reg(state, STB0899_S2DEMOD, STB0899_BASE_BTR_LOOP_GAIN, STB0899_OFF0_BTR_LOOP_GAIN, 0xc4c4f);
}
/*
* stb0899_dvbs2_set_carr_freq
* set nominal frequency for carrier search
*/
static void stb0899_dvbs2_set_carr_freq(struct stb0899_state *state, s32 carr_freq, u32 master_clk)
{
struct stb0899_config *config = state->config;
s32 crl_nom_freq;
crl_nom_freq = (1 << config->crl_nco_bits) / master_clk;
crl_nom_freq *= carr_freq;
stb0899_write_s2reg(state, STB0899_S2DEMOD, STB0899_BASE_CRL_NOM_FREQ, STB0899_OFF0_CRL_NOM_FREQ, crl_nom_freq);
}
/*
* stb0899_dvbs2_init_calc
* Initialize DVBS2 UWP, CSM, carrier and timing loops
*/
static void stb0899_dvbs2_init_calc(struct stb0899_state *state)
{
struct stb0899_internal *internal = &state->internal;
s32 steps, step_size;
u32 range, reg;
/* config uwp and csm */
stb0899_dvbs2_config_uwp(state);
stb0899_dvbs2_config_csm_auto(state);
/* initialize BTR */
stb0899_dvbs2_set_srate(state);
stb0899_dvbs2_set_btr_loopbw(state);
if (internal->srate / 1000000 >= 15)
step_size = (1 << 17) / 5;
else if (internal->srate / 1000000 >= 10)
step_size = (1 << 17) / 7;
else if (internal->srate / 1000000 >= 5)
step_size = (1 << 17) / 10;
else
step_size = (1 << 17) / 4;