drivers/dpll/zl3073x/core.h

/* SPDX-License-Identifier: GPL-2.0-only */

#ifndef _ZL3073X_CORE_H
#define _ZL3073X_CORE_H

#include <linux/bitfield.h>
#include <linux/kthread.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/types.h>

#include "out.h"
#include "ref.h"
#include "regs.h"
#include "synth.h"

struct device;
struct regmap;
struct zl3073x_dpll;

/*
 * Hardware limits for ZL3073x chip family
 */
#define ZL3073X_MAX_CHANNELS	5
#define ZL3073X_NUM_REFS	10
#define ZL3073X_NUM_OUTS	10
#define ZL3073X_NUM_SYNTHS	5
#define ZL3073X_NUM_INPUT_PINS	ZL3073X_NUM_REFS
#define ZL3073X_NUM_OUTPUT_PINS	(ZL3073X_NUM_OUTS * 2)
#define ZL3073X_NUM_PINS	(ZL3073X_NUM_INPUT_PINS + \
				 ZL3073X_NUM_OUTPUT_PINS)

/**
 * struct zl3073x_dev - zl3073x device
 * @dev: pointer to device
 * @regmap: regmap to access device registers
 * @multiop_lock: to serialize multiple register operations
 * @chip_id: chip ID read from hardware
 * @ref: array of input references' invariants
 * @out: array of outs' invariants
 * @synth: array of synths' invariants
 * @dplls: list of DPLLs
 * @kworker: thread for periodic work
 * @work: periodic work
 * @clock_id: clock id of the device
 * @phase_avg_factor: phase offset measurement averaging factor
 */
struct zl3073x_dev {
	struct device		*dev;
	struct regmap		*regmap;
	struct mutex		multiop_lock;
	u16			chip_id;

	/* Invariants */
	struct zl3073x_ref	ref[ZL3073X_NUM_REFS];
	struct zl3073x_out	out[ZL3073X_NUM_OUTS];
	struct zl3073x_synth	synth[ZL3073X_NUM_SYNTHS];

	/* DPLL channels */
	struct list_head	dplls;

	/* Monitor */
	struct kthread_worker		*kworker;
	struct kthread_delayed_work	work;

	/* Devlink parameters */
	u64			clock_id;
	u8			phase_avg_factor;
};

struct zl3073x_chip_info {
	const u16	*ids;
	size_t		num_ids;
	int		num_channels;
};

extern const struct zl3073x_chip_info zl30731_chip_info;
extern const struct zl3073x_chip_info zl30732_chip_info;
extern const struct zl3073x_chip_info zl30733_chip_info;
extern const struct zl3073x_chip_info zl30734_chip_info;
extern const struct zl3073x_chip_info zl30735_chip_info;
extern const struct regmap_config zl3073x_regmap_config;

struct zl3073x_dev *zl3073x_devm_alloc(struct device *dev);
int zl3073x_dev_probe(struct zl3073x_dev *zldev,
		      const struct zl3073x_chip_info *chip_info);

int zl3073x_dev_start(struct zl3073x_dev *zldev, bool full);
void zl3073x_dev_stop(struct zl3073x_dev *zldev);

static inline u8 zl3073x_dev_phase_avg_factor_get(struct zl3073x_dev *zldev)
{
	return zldev->phase_avg_factor;
}

int zl3073x_dev_phase_avg_factor_set(struct zl3073x_dev *zldev, u8 factor);

/**********************
 * Registers operations
 **********************/

/**
 * struct zl3073x_hwreg_seq_item - HW register write sequence item
 * @addr: HW register to be written
 * @value: value to be written to HW register
 * @mask: bitmask indicating bits to be updated
 * @wait: number of ms to wait after register write
 */
struct zl3073x_hwreg_seq_item {
	u32	addr;
	u32	value;
	u32	mask;
	u32	wait;
};

#define HWREG_SEQ_ITEM(_addr, _value, _mask, _wait)	\
{							\
	.addr	= _addr,				\
	.value	= FIELD_PREP_CONST(_mask, _value),	\
	.mask	= _mask,				\
	.wait	= _wait,				\
}

int zl3073x_mb_op(struct zl3073x_dev *zldev, unsigned int op_reg, u8 op_val,
		  unsigned int mask_reg, u16 mask_val);
int zl3073x_poll_zero_u8(struct zl3073x_dev *zldev, unsigned int reg, u8 mask);
int zl3073x_read_u8(struct zl3073x_dev *zldev, unsigned int reg, u8 *val);
int zl3073x_read_u16(struct zl3073x_dev *zldev, unsigned int reg, u16 *val);
int zl3073x_read_u32(struct zl3073x_dev *zldev, unsigned int reg, u32 *val);
int zl3073x_read_u48(struct zl3073x_dev *zldev, unsigned int reg, u64 *val);
int zl3073x_write_u8(struct zl3073x_dev *zldev, unsigned int reg, u8 val);
int zl3073x_write_u16(struct zl3073x_dev *zldev, unsigned int reg, u16 val);
int zl3073x_write_u32(struct zl3073x_dev *zldev, unsigned int reg, u32 val);
int zl3073x_write_u48(struct zl3073x_dev *zldev, unsigned int reg, u64 val);
int zl3073x_read_hwreg(struct zl3073x_dev *zldev, u32 addr, u32 *value);
int zl3073x_write_hwreg(struct zl3073x_dev *zldev, u32 addr, u32 value);
int zl3073x_update_hwreg(struct zl3073x_dev *zldev, u32 addr, u32 value,
			 u32 mask);
int zl3073x_write_hwreg_seq(struct zl3073x_dev *zldev,
			    const struct zl3073x_hwreg_seq_item *seq,
			    size_t num_items);

/*****************
 * Misc operations
 *****************/

int zl3073x_ref_phase_offsets_update(struct zl3073x_dev *zldev, int channel);

/**
 * zl3073x_dev_is_ref_phase_comp_32bit - check ref phase comp register size
 * @zldev: pointer to zl3073x device
 *
 * Some chip IDs have a 32-bit wide ref_phase_offset_comp register instead
 * of the default 48-bit.
 *
 * Return: true if the register is 32-bit, false if 48-bit
 */
static inline bool
zl3073x_dev_is_ref_phase_comp_32bit(struct zl3073x_dev *zldev)
{
	switch (zldev->chip_id) {
	case 0x0E30:
	case 0x0E93:
	case 0x0E94:
	case 0x0E95:
	case 0x0E96:
	case 0x0E97:
	case 0x1F60:
		return true;
	default:
		return false;
	}
}

static inline bool
zl3073x_is_n_pin(u8 id)
{
	/* P-pins ids are even while N-pins are odd */
	return id & 1;
}

static inline bool
zl3073x_is_p_pin(u8 id)
{
	return !zl3073x_is_n_pin(id);
}

/**
 * zl3073x_input_pin_ref_get - get reference for given input pin
 * @id: input pin id
 *
 * Return: reference id for the given input pin
 */
static inline u8
zl3073x_input_pin_ref_get(u8 id)
{
	return id;
}

/**
 * zl3073x_output_pin_out_get - get output for the given output pin
 * @id: output pin id
 *
 * Return: output id for the given output pin
 */
static inline u8
zl3073x_output_pin_out_get(u8 id)
{
	/* Output pin pair shares the single output */
	return id / 2;
}

/**
 * zl3073x_dev_ref_freq_get - get input reference frequency
 * @zldev: pointer to zl3073x device
 * @index: input reference index
 *
 * Return: frequency of given input reference
 */
static inline u32
zl3073x_dev_ref_freq_get(struct zl3073x_dev *zldev, u8 index)
{
	const struct zl3073x_ref *ref = zl3073x_ref_state_get(zldev, index);

	return zl3073x_ref_freq_get(ref);
}

/**
 * zl3073x_dev_ref_is_diff - check if the given input reference is differential
 * @zldev: pointer to zl3073x device
 * @index: input reference index
 *
 * Return: true if reference is differential, false if reference is single-ended
 */
static inline bool
zl3073x_dev_ref_is_diff(struct zl3073x_dev *zldev, u8 index)
{
	const struct zl3073x_ref *ref = zl3073x_ref_state_get(zldev, index);

	return zl3073x_ref_is_diff(ref);
}

/*
 * zl3073x_dev_ref_is_status_ok - check the given input reference status
 * @zldev: pointer to zl3073x device
 * @index: input reference index
 *
 * Return: true if the status is ok, false otherwise
 */
static inline bool
zl3073x_dev_ref_is_status_ok(struct zl3073x_dev *zldev, u8 index)
{
	const struct zl3073x_ref *ref = zl3073x_ref_state_get(zldev, index);

	return zl3073x_ref_is_status_ok(ref);
}

/**
 * zl3073x_dev_synth_freq_get - get synth current freq
 * @zldev: pointer to zl3073x device
 * @index: synth index
 *
 * Return: frequency of given synthetizer
 */
static inline u32
zl3073x_dev_synth_freq_get(struct zl3073x_dev *zldev, u8 index)
{
	const struct zl3073x_synth *synth;

	synth = zl3073x_synth_state_get(zldev, index);
	return zl3073x_synth_freq_get(synth);
}

/**
 * zl3073x_dev_out_synth_get - get synth connected to given output
 * @zldev: pointer to zl3073x device
 * @index: output index
 *
 * Return: index of synth connected to given output.
 */
static inline u8
zl3073x_dev_out_synth_get(struct zl3073x_dev *zldev, u8 index)
{
	const struct zl3073x_out *out = zl3073x_out_state_get(zldev, index);

	return zl3073x_out_synth_get(out);
}

/**
 * zl3073x_dev_out_is_enabled - check if the given output is enabled
 * @zldev: pointer to zl3073x device
 * @index: output index
 *
 * Return: true if the output is enabled, false otherwise
 */
static inline bool
zl3073x_dev_out_is_enabled(struct zl3073x_dev *zldev, u8 index)
{
	const struct zl3073x_out *out = zl3073x_out_state_get(zldev, index);
	const struct zl3073x_synth *synth;
	u8 synth_id;

	/* Output is enabled only if associated synth is enabled */
	synth_id = zl3073x_out_synth_get(out);
	synth = zl3073x_synth_state_get(zldev, synth_id);

	return zl3073x_synth_is_enabled(synth) && zl3073x_out_is_enabled(out);
}

/**
 * zl3073x_dev_out_dpll_get - get DPLL ID the output is driven by
 * @zldev: pointer to zl3073x device
 * @index: output index
 *
 * Return: ID of DPLL the given output is driven by
 */
static inline
u8 zl3073x_dev_out_dpll_get(struct zl3073x_dev *zldev, u8 index)
{
	const struct zl3073x_out *out = zl3073x_out_state_get(zldev, index);
	const struct zl3073x_synth *synth;
	u8 synth_id;

	/* Get synthesizer connected to given output */
	synth_id = zl3073x_out_synth_get(out);
	synth = zl3073x_synth_state_get(zldev, synth_id);

	/* Return DPLL that drives the synth */
	return zl3073x_synth_dpll_get(synth);
}

/**
 * zl3073x_dev_output_pin_freq_get - get output pin frequency
 * @zldev: pointer to zl3073x device
 * @id: output pin id
 *
 * Computes the output pin frequency based on the synth frequency, output
 * divisor, and signal format. For N-div formats, N-pin frequency is
 * additionally divided by esync_n_period.
 *
 * Return: frequency of the given output pin in Hz
 */
static inline u32
zl3073x_dev_output_pin_freq_get(struct zl3073x_dev *zldev, u8 id)
{
	const struct zl3073x_synth *synth;
	const struct zl3073x_out *out;
	u8 out_id;
	u32 freq;

	out_id = zl3073x_output_pin_out_get(id);
	out = zl3073x_out_state_get(zldev, out_id);
	synth = zl3073x_synth_state_get(zldev, zl3073x_out_synth_get(out));
	freq = zl3073x_synth_freq_get(synth) / out->div;

	if (zl3073x_out_is_ndiv(out) && zl3073x_is_n_pin(id))
		freq /= out->esync_n_period;

	return freq;
}

/**
 * zl3073x_dev_out_is_diff - check if the given output is differential
 * @zldev: pointer to zl3073x device
 * @index: output index
 *
 * Return: true if output is differential, false if output is single-ended
 */
static inline bool
zl3073x_dev_out_is_diff(struct zl3073x_dev *zldev, u8 index)
{
	const struct zl3073x_out *out = zl3073x_out_state_get(zldev, index);

	return zl3073x_out_is_diff(out);
}

/**
 * zl3073x_dev_output_pin_is_enabled - check if the given output pin is enabled
 * @zldev: pointer to zl3073x device
 * @id: output pin id
 *
 * Checks if the output of the given output pin is enabled and also that
 * its signal format also enables the given pin.
 *
 * Return: true if output pin is enabled, false if output pin is disabled
 */
static inline bool
zl3073x_dev_output_pin_is_enabled(struct zl3073x_dev *zldev, u8 id)
{
	u8 out_id = zl3073x_output_pin_out_get(id);
	const struct zl3073x_out *out;

	out = zl3073x_out_state_get(zldev, out_id);

	/* Check if the output is enabled - call _dev_ helper that
	 * additionally checks for attached synth enablement.
	 */
	if (!zl3073x_dev_out_is_enabled(zldev, out_id))
		return false;

	/* Check signal format */
	switch (zl3073x_out_signal_format_get(out)) {
	case ZL_OUTPUT_MODE_SIGNAL_FORMAT_DISABLED:
		/* Both output pins are disabled by signal format */
		return false;

	case ZL_OUTPUT_MODE_SIGNAL_FORMAT_1P:
		/* Output is one single ended P-pin output */
		if (zl3073x_is_n_pin(id))
			return false;
		break;
	case ZL_OUTPUT_MODE_SIGNAL_FORMAT_1N:
		/* Output is one single ended N-pin output */
		if (zl3073x_is_p_pin(id))
			return false;
		break;
	default:
		/* For other format both pins are enabled */
		break;
	}

	return true;
}

#endif /* _ZL3073X_CORE_H */