linux/drivers/media/dvb-frontends/stb0899_algo.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
	STB0899 Multistandard Frontend driver
	Copyright (C) Manu Abraham ([email protected])

	Copyright (C) ST Microelectronics

*/

#include <linux/bitops.h>
#include "stb0899_drv.h"
#include "stb0899_priv.h"
#include "stb0899_reg.h"

static inline u32 stb0899_do_div(u64 n, u32 d)
{ … }

#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)
{ … }

/*
 * 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)
{ … }

/*
 * stb0899_carr_width
 * Compute the width of the carrier
 * return: width of carrier (kHz or Mhz)
 */
long stb0899_carr_width(struct stb0899_state *state)
{ … }

/*
 * stb0899_first_subrange
 * Compute the first subrange of the search
 */
static void stb0899_first_subrange(struct stb0899_state *state)
{ … }

/*
 * 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)
{ … }

/*
 * stb0899_search_tmg
 * perform a fs/2 zig-zag to find timing
 */
static enum stb0899_status stb0899_search_tmg(struct stb0899_state *state)
{ … }

/*
 * stb0899_check_carrier
 * Check for carrier found
 */
static enum stb0899_status stb0899_check_carrier(struct stb0899_state *state)
{ … }

/*
 * stb0899_search_carrier
 * Search for a QPSK carrier with the derotator
 */
static enum stb0899_status stb0899_search_carrier(struct stb0899_state *state)
{ … }

/*
 * stb0899_check_data
 * Check for data found
 */
static enum stb0899_status stb0899_check_data(struct stb0899_state *state)
{ … }

/*
 * stb0899_search_data
 * Search for a QPSK carrier with the derotator
 */
static enum stb0899_status stb0899_search_data(struct stb0899_state *state)
{ … }

/*
 * stb0899_check_range
 * check if the found frequency is in the correct range
 */
static enum stb0899_status stb0899_check_range(struct stb0899_state *state)
{ … }

/*
 * NextSubRange
 * Compute the next subrange of the search
 */
static void next_sub_range(struct stb0899_state *state)
{ … }

/*
 * 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)
{ … }

/*
 * stb0899_dvbs2_config_uwp
 * Configure UWP state machine
 */
static void stb0899_dvbs2_config_uwp(struct stb0899_state *state)
{ … }

/*
 * stb0899_dvbs2_config_csm_auto
 * Set CSM to AUTO mode
 */
static void stb0899_dvbs2_config_csm_auto(struct stb0899_state *state)
{ … }

static long Log2Int(int number)
{ … }

/*
 * stb0899_dvbs2_calc_srate
 * compute BTR_NOM_FREQ for the symbol rate
 */
static u32 stb0899_dvbs2_calc_srate(struct stb0899_state *state)
{ … }

/*
 * stb0899_dvbs2_calc_dev
 * compute the correction to be applied to symbol rate
 */
static u32 stb0899_dvbs2_calc_dev(struct stb0899_state *state)
{ … }

/*
 * stb0899_dvbs2_set_srate
 * Set DVBS2 symbol rate
 */
static void stb0899_dvbs2_set_srate(struct stb0899_state *state)
{ … }

/*
 * 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)
{ … }

/*
 * 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)
{ … }

/*
 * stb0899_dvbs2_init_calc
 * Initialize DVBS2 UWP, CSM, carrier and timing loops
 */
static void stb0899_dvbs2_init_calc(struct stb0899_state *state)
{ … }

/*
 * stb0899_dvbs2_btr_init
 * initialize the timing loop
 */
static void stb0899_dvbs2_btr_init(struct stb0899_state *state)
{ … }

/*
 * stb0899_dvbs2_reacquire
 * trigger a DVB-S2 acquisition
 */
static void stb0899_dvbs2_reacquire(struct stb0899_state *state)
{ … }

/*
 * stb0899_dvbs2_get_dmd_status
 * get DVB-S2 Demod LOCK status
 */
static enum stb0899_status stb0899_dvbs2_get_dmd_status(struct stb0899_state *state, int timeout)
{ … }

/*
 * stb0899_dvbs2_get_data_lock
 * get FEC status
 */
static int stb0899_dvbs2_get_data_lock(struct stb0899_state *state, int timeout)
{ … }

/*
 * stb0899_dvbs2_get_fec_status
 * get DVB-S2 FEC LOCK status
 */
static enum stb0899_status stb0899_dvbs2_get_fec_status(struct stb0899_state *state, int timeout)
{ … }


/*
 * stb0899_dvbs2_init_csm
 * set parameters for manual mode
 */
static void stb0899_dvbs2_init_csm(struct stb0899_state *state, int pilots, enum stb0899_modcod modcod)
{ … }

/*
 * stb0899_dvbs2_get_srate
 * get DVB-S2 Symbol Rate
 */
static u32 stb0899_dvbs2_get_srate(struct stb0899_state *state)
{ … }

/*
 * stb0899_dvbs2_algo
 * Search for signal, timing, carrier and data for a given
 * frequency in a given range
 */
enum stb0899_status stb0899_dvbs2_algo(struct stb0899_state *state)
{ … }