dpll/zl3073x/core.c

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

#include <linux/array_size.h>
#include <linux/bitfield.h>
#include <linux/bits.h>
#include <linux/dev_printk.h>
#include <linux/device.h>
#include <linux/export.h>
#include <linux/math64.h>
#include <linux/module.h>
#include <linux/netlink.h>
#include <linux/regmap.h>
#include <linux/sprintf.h>
#include <linux/string_choices.h>
#include <linux/unaligned.h>
#include <net/devlink.h>

#include "core.h"
#include "devlink.h"
#include "dpll.h"
#include "regs.h"

#define ZL_CHIP_INFO(_id, _nchannels, _flags)				\
	{ .id = (_id), .num_channels = (_nchannels), .flags = (_flags) }

static const struct zl3073x_chip_info zl3073x_chip_ids[] = {
	ZL_CHIP_INFO(0x0E30, 2, ZL3073X_FLAG_REF_PHASE_COMP_32),
	ZL_CHIP_INFO(0x0E93, 1, ZL3073X_FLAG_REF_PHASE_COMP_32),
	ZL_CHIP_INFO(0x0E94, 2, ZL3073X_FLAG_REF_PHASE_COMP_32),
	ZL_CHIP_INFO(0x0E95, 3, ZL3073X_FLAG_REF_PHASE_COMP_32),
	ZL_CHIP_INFO(0x0E96, 4, ZL3073X_FLAG_REF_PHASE_COMP_32),
	ZL_CHIP_INFO(0x0E97, 5, ZL3073X_FLAG_REF_PHASE_COMP_32),
	ZL_CHIP_INFO(0x1E93, 1, ZL3073X_FLAG_DIE_TEMP),
	ZL_CHIP_INFO(0x1E94, 2, ZL3073X_FLAG_DIE_TEMP),
	ZL_CHIP_INFO(0x1E95, 3, ZL3073X_FLAG_DIE_TEMP),
	ZL_CHIP_INFO(0x1E96, 4, ZL3073X_FLAG_DIE_TEMP),
	ZL_CHIP_INFO(0x1E97, 5, ZL3073X_FLAG_DIE_TEMP),
	ZL_CHIP_INFO(0x1F60, 2, ZL3073X_FLAG_REF_PHASE_COMP_32),
	ZL_CHIP_INFO(0x2E93, 1, ZL3073X_FLAG_DIE_TEMP),
	ZL_CHIP_INFO(0x2E94, 2, ZL3073X_FLAG_DIE_TEMP),
	ZL_CHIP_INFO(0x2E95, 3, ZL3073X_FLAG_DIE_TEMP),
	ZL_CHIP_INFO(0x2E96, 4, ZL3073X_FLAG_DIE_TEMP),
	ZL_CHIP_INFO(0x2E97, 5, ZL3073X_FLAG_DIE_TEMP),
	ZL_CHIP_INFO(0x3FC4, 2, ZL3073X_FLAG_DIE_TEMP),
};

#define ZL_RANGE_OFFSET		0x80
#define ZL_PAGE_SIZE		0x80
#define ZL_NUM_PAGES		256
#define ZL_PAGE_SEL		0x7F
#define ZL_PAGE_SEL_MASK	GENMASK(7, 0)
#define ZL_NUM_REGS		(ZL_NUM_PAGES * ZL_PAGE_SIZE)

/* Regmap range configuration */
static const struct regmap_range_cfg zl3073x_regmap_range = {
	.range_min	= ZL_RANGE_OFFSET,
	.range_max	= ZL_RANGE_OFFSET + ZL_NUM_REGS - 1,
	.selector_reg	= ZL_PAGE_SEL,
	.selector_mask	= ZL_PAGE_SEL_MASK,
	.selector_shift	= 0,
	.window_start	= 0,
	.window_len	= ZL_PAGE_SIZE,
};

static bool
zl3073x_is_volatile_reg(struct device *dev __maybe_unused, unsigned int reg)
{
	/* Only page selector is non-volatile */
	return reg != ZL_PAGE_SEL;
}

const struct regmap_config zl3073x_regmap_config = {
	.reg_bits	= 8,
	.val_bits	= 8,
	.max_register	= ZL_RANGE_OFFSET + ZL_NUM_REGS - 1,
	.ranges		= &zl3073x_regmap_range,
	.num_ranges	= 1,
	.cache_type	= REGCACHE_MAPLE,
	.volatile_reg	= zl3073x_is_volatile_reg,
};
EXPORT_SYMBOL_NS_GPL(zl3073x_regmap_config, "ZL3073X");

static bool
zl3073x_check_reg(struct zl3073x_dev *zldev, unsigned int reg, size_t size)
{
	/* Check that multiop lock is held when accessing registers
	 * from page 10 and above except the page 255 that does not
	 * need this protection.
	 */
	if (ZL_REG_PAGE(reg) >= 10 && ZL_REG_PAGE(reg) < 255)
		lockdep_assert_held(&zldev->multiop_lock);

	/* Check the index is in valid range for indexed register */
	if (ZL_REG_OFFSET(reg) > ZL_REG_MAX_OFFSET(reg)) {
		dev_err(zldev->dev, "Index out of range for reg 0x%04lx\n",
			ZL_REG_ADDR(reg));
		return false;
	}
	/* Check the requested size corresponds to register size */
	if (ZL_REG_SIZE(reg) != size) {
		dev_err(zldev->dev, "Invalid size %zu for reg 0x%04lx\n",
			size, ZL_REG_ADDR(reg));
		return false;
	}

	return true;
}

static int
zl3073x_read_reg(struct zl3073x_dev *zldev, unsigned int reg, void *val,
		 size_t size)
{
	int rc;

	if (!zl3073x_check_reg(zldev, reg, size))
		return -EINVAL;

	/* Map the register address to virtual range */
	reg = ZL_REG_ADDR(reg) + ZL_RANGE_OFFSET;

	rc = regmap_bulk_read(zldev->regmap, reg, val, size);
	if (rc) {
		dev_err(zldev->dev, "Failed to read reg 0x%04x: %pe\n", reg,
			ERR_PTR(rc));
		return rc;
	}

	return 0;
}

static int
zl3073x_write_reg(struct zl3073x_dev *zldev, unsigned int reg, const void *val,
		  size_t size)
{
	int rc;

	if (!zl3073x_check_reg(zldev, reg, size))
		return -EINVAL;

	/* Map the register address to virtual range */
	reg = ZL_REG_ADDR(reg) + ZL_RANGE_OFFSET;

	rc = regmap_bulk_write(zldev->regmap, reg, val, size);
	if (rc) {
		dev_err(zldev->dev, "Failed to write reg 0x%04x: %pe\n", reg,
			ERR_PTR(rc));
		return rc;
	}

	return 0;
}

/**
 * zl3073x_read_u8 - read value from 8bit register
 * @zldev: zl3073x device pointer
 * @reg: register to write to
 * @val: value to write
 *
 * Reads value from given 8bit register.
 *
 * Returns: 0 on success, <0 on error
 */
int zl3073x_read_u8(struct zl3073x_dev *zldev, unsigned int reg, u8 *val)
{
	return zl3073x_read_reg(zldev, reg, val, sizeof(*val));
}

/**
 * zl3073x_write_u8 - write value to 16bit register
 * @zldev: zl3073x device pointer
 * @reg: register to write to
 * @val: value to write
 *
 * Writes value into given 8bit register.
 *
 * Returns: 0 on success, <0 on error
 */
int zl3073x_write_u8(struct zl3073x_dev *zldev, unsigned int reg, u8 val)
{
	return zl3073x_write_reg(zldev, reg, &val, sizeof(val));
}

/**
 * zl3073x_read_u16 - read value from 16bit register
 * @zldev: zl3073x device pointer
 * @reg: register to write to
 * @val: value to write
 *
 * Reads value from given 16bit register.
 *
 * Returns: 0 on success, <0 on error
 */
int zl3073x_read_u16(struct zl3073x_dev *zldev, unsigned int reg, u16 *val)
{
	int rc;

	rc = zl3073x_read_reg(zldev, reg, val, sizeof(*val));
	if (!rc)
		be16_to_cpus(val);

	return rc;
}

/**
 * zl3073x_write_u16 - write value to 16bit register
 * @zldev: zl3073x device pointer
 * @reg: register to write to
 * @val: value to write
 *
 * Writes value into given 16bit register.
 *
 * Returns: 0 on success, <0 on error
 */
int zl3073x_write_u16(struct zl3073x_dev *zldev, unsigned int reg, u16 val)
{
	cpu_to_be16s(&val);

	return zl3073x_write_reg(zldev, reg, &val, sizeof(val));
}

/**
 * zl3073x_read_u32 - read value from 32bit register
 * @zldev: zl3073x device pointer
 * @reg: register to write to
 * @val: value to write
 *
 * Reads value from given 32bit register.
 *
 * Returns: 0 on success, <0 on error
 */
int zl3073x_read_u32(struct zl3073x_dev *zldev, unsigned int reg, u32 *val)
{
	int rc;

	rc = zl3073x_read_reg(zldev, reg, val, sizeof(*val));
	if (!rc)
		be32_to_cpus(val);

	return rc;
}

/**
 * zl3073x_write_u32 - write value to 32bit register
 * @zldev: zl3073x device pointer
 * @reg: register to write to
 * @val: value to write
 *
 * Writes value into given 32bit register.
 *
 * Returns: 0 on success, <0 on error
 */
int zl3073x_write_u32(struct zl3073x_dev *zldev, unsigned int reg, u32 val)
{
	cpu_to_be32s(&val);

	return zl3073x_write_reg(zldev, reg, &val, sizeof(val));
}

/**
 * zl3073x_read_u48 - read value from 48bit register
 * @zldev: zl3073x device pointer
 * @reg: register to write to
 * @val: value to write
 *
 * Reads value from given 48bit register.
 *
 * Returns: 0 on success, <0 on error
 */
int zl3073x_read_u48(struct zl3073x_dev *zldev, unsigned int reg, u64 *val)
{
	u8 buf[6];
	int rc;

	rc = zl3073x_read_reg(zldev, reg, buf, sizeof(buf));
	if (!rc)
		*val = get_unaligned_be48(buf);

	return rc;
}

/**
 * zl3073x_write_u48 - write value to 48bit register
 * @zldev: zl3073x device pointer
 * @reg: register to write to
 * @val: value to write
 *
 * Writes value into given 48bit register.
 * The value must be from the interval -S48_MIN to U48_MAX.
 *
 * Returns: 0 on success, <0 on error
 */
int zl3073x_write_u48(struct zl3073x_dev *zldev, unsigned int reg, u64 val)
{
	u8 buf[6];

	/* Check the value belongs to <S48_MIN, U48_MAX>
	 * Any value >= S48_MIN has bits 47..63 set.
	 */
	if (val > GENMASK_ULL(47, 0) && val < GENMASK_ULL(63, 47)) {
		dev_err(zldev->dev, "Value 0x%0llx out of range\n", val);
		return -EINVAL;
	}

	put_unaligned_be48(val, buf);

	return zl3073x_write_reg(zldev, reg, buf, sizeof(buf));
}

/**
 * zl3073x_poll_zero_u8 - wait for register to be cleared by device
 * @zldev: zl3073x device pointer
 * @reg: register to poll (has to be 8bit register)
 * @mask: bit mask for polling
 *
 * Waits for bits specified by @mask in register @reg value to be cleared
 * by the device.
 *
 * Returns: 0 on success, <0 on error
 */
int zl3073x_poll_zero_u8(struct zl3073x_dev *zldev, unsigned int reg, u8 mask)
{
	/* Register polling sleep & timeout */
#define ZL_POLL_SLEEP_US   10
#define ZL_POLL_TIMEOUT_US 2000000
	unsigned int val;

	/* Check the register is 8bit */
	if (ZL_REG_SIZE(reg) != 1) {
		dev_err(zldev->dev, "Invalid reg 0x%04lx size for polling\n",
			ZL_REG_ADDR(reg));
		return -EINVAL;
	}

	/* Map the register address to virtual range */
	reg = ZL_REG_ADDR(reg) + ZL_RANGE_OFFSET;

	return regmap_read_poll_timeout(zldev->regmap, reg, val, !(val & mask),
					ZL_POLL_SLEEP_US, ZL_POLL_TIMEOUT_US);
}

int zl3073x_mb_op(struct zl3073x_dev *zldev, unsigned int op_reg, u8 op_val,
		  unsigned int mask_reg, u16 mask_val)
{
	int rc;

	/* Set mask for the operation */
	rc = zl3073x_write_u16(zldev, mask_reg, mask_val);
	if (rc)
		return rc;

	/* Trigger the operation */
	rc = zl3073x_write_u8(zldev, op_reg, op_val);
	if (rc)
		return rc;

	/* Wait for the operation to actually finish */
	return zl3073x_poll_zero_u8(zldev, op_reg, op_val);
}

/**
 * zl3073x_do_hwreg_op - Perform HW register read/write operation
 * @zldev: zl3073x device pointer
 * @op: operation to perform
 *
 * Performs requested operation and waits for its completion.
 *
 * Return: 0 on success, <0 on error
 */
static int
zl3073x_do_hwreg_op(struct zl3073x_dev *zldev, u8 op)
{
	int rc;

	/* Set requested operation and set pending bit */
	rc = zl3073x_write_u8(zldev, ZL_REG_HWREG_OP, op | ZL_HWREG_OP_PENDING);
	if (rc)
		return rc;

	/* Poll for completion - pending bit cleared */
	return zl3073x_poll_zero_u8(zldev, ZL_REG_HWREG_OP,
				    ZL_HWREG_OP_PENDING);
}

/**
 * zl3073x_read_hwreg - Read HW register
 * @zldev: zl3073x device pointer
 * @addr: HW register address
 * @value: Value of the HW register
 *
 * Reads HW register value and stores it into @value.
 *
 * Return: 0 on success, <0 on error
 */
int zl3073x_read_hwreg(struct zl3073x_dev *zldev, u32 addr, u32 *value)
{
	int rc;

	/* Set address to read data from */
	rc = zl3073x_write_u32(zldev, ZL_REG_HWREG_ADDR, addr);
	if (rc)
		return rc;

	/* Perform the read operation */
	rc = zl3073x_do_hwreg_op(zldev, ZL_HWREG_OP_READ);
	if (rc)
		return rc;

	/* Read the received data */
	return zl3073x_read_u32(zldev, ZL_REG_HWREG_READ_DATA, value);
}

/**
 * zl3073x_write_hwreg - Write value to HW register
 * @zldev: zl3073x device pointer
 * @addr: HW registers address
 * @value: Value to be written to HW register
 *
 * Stores the requested value into HW register.
 *
 * Return: 0 on success, <0 on error
 */
int zl3073x_write_hwreg(struct zl3073x_dev *zldev, u32 addr, u32 value)
{
	int rc;

	/* Set address to write data to */
	rc = zl3073x_write_u32(zldev, ZL_REG_HWREG_ADDR, addr);
	if (rc)
		return rc;

	/* Set data to be written */
	rc = zl3073x_write_u32(zldev, ZL_REG_HWREG_WRITE_DATA, value);
	if (rc)
		return rc;

	/* Perform the write operation */
	return zl3073x_do_hwreg_op(zldev, ZL_HWREG_OP_WRITE);
}

/**
 * zl3073x_update_hwreg - Update certain bits in HW register
 * @zldev: zl3073x device pointer
 * @addr: HW register address
 * @value: Value to be written into HW register
 * @mask: Bitmask indicating bits to be updated
 *
 * Reads given HW register, updates requested bits specified by value and
 * mask and writes result back to HW register.
 *
 * Return: 0 on success, <0 on error
 */
int zl3073x_update_hwreg(struct zl3073x_dev *zldev, u32 addr, u32 value,
			 u32 mask)
{
	u32 tmp;
	int rc;

	rc = zl3073x_read_hwreg(zldev, addr, &tmp);
	if (rc)
		return rc;

	tmp &= ~mask;
	tmp |= value & mask;

	return zl3073x_write_hwreg(zldev, addr, tmp);
}

/**
 * zl3073x_write_hwreg_seq - Write HW registers sequence
 * @zldev: pointer to device structure
 * @seq: pointer to first sequence item
 * @num_items: number of items in sequence
 *
 * Writes given HW registers sequence.
 *
 * Return: 0 on success, <0 on error
 */
int zl3073x_write_hwreg_seq(struct zl3073x_dev *zldev,
			    const struct zl3073x_hwreg_seq_item *seq,
			    size_t num_items)
{
	int i, rc = 0;

	for (i = 0; i < num_items; i++) {
		dev_dbg(zldev->dev, "Write 0x%0x [0x%0x] to 0x%0x",
			seq[i].value, seq[i].mask, seq[i].addr);

		if (seq[i].mask == U32_MAX)
			/* Write value directly */
			rc = zl3073x_write_hwreg(zldev, seq[i].addr,
						 seq[i].value);
		else
			/* Update only bits specified by the mask */
			rc = zl3073x_update_hwreg(zldev, seq[i].addr,
						  seq[i].value, seq[i].mask);
		if (rc)
			return rc;

		if (seq->wait)
			msleep(seq->wait);
	}

	return rc;
}

static int
zl3073x_dev_state_fetch(struct zl3073x_dev *zldev)
{
	int rc;
	u8 i;

	for (i = 0; i < ZL3073X_NUM_REFS; i++) {
		rc = zl3073x_ref_state_fetch(zldev, i);
		if (rc) {
			dev_err(zldev->dev,
				"Failed to fetch input state: %pe\n",
				ERR_PTR(rc));
			return rc;
		}
	}

	for (i = 0; i < ZL3073X_NUM_SYNTHS; i++) {
		rc = zl3073x_synth_state_fetch(zldev, i);
		if (rc) {
			dev_err(zldev->dev,
				"Failed to fetch synth state: %pe\n",
				ERR_PTR(rc));
			return rc;
		}
	}

	for (i = 0; i < ZL3073X_NUM_OUTS; i++) {
		rc = zl3073x_out_state_fetch(zldev, i);
		if (rc) {
			dev_err(zldev->dev,
				"Failed to fetch output state: %pe\n",
				ERR_PTR(rc));
			return rc;
		}
	}

	for (i = 0; i < zldev->info->num_channels; i++) {
		rc = zl3073x_chan_state_fetch(zldev, i);
		if (rc) {
			dev_err(zldev->dev,
				"Failed to fetch channel state: %pe\n",
				ERR_PTR(rc));
			return rc;
		}
	}

	return rc;
}

static void
zl3073x_dev_ref_states_update(struct zl3073x_dev *zldev)
{
	int i, rc;

	for (i = 0; i < ZL3073X_NUM_REFS; i++) {
		rc = zl3073x_ref_state_update(zldev, i);
		if (rc)
			dev_warn(zldev->dev,
				 "Failed to get REF%u status: %pe\n", i,
				 ERR_PTR(rc));
	}
}

static void
zl3073x_dev_chan_states_update(struct zl3073x_dev *zldev)
{
	int i, rc;

	for (i = 0; i < zldev->info->num_channels; i++) {
		rc = zl3073x_chan_state_update(zldev, i);
		if (rc)
			dev_warn(zldev->dev,
				 "Failed to get DPLL%u state: %pe\n", i,
				 ERR_PTR(rc));
	}
}

/**
 * zl3073x_ref_phase_offsets_update - update reference phase offsets
 * @zldev: pointer to zl3073x_dev structure
 * @channel: DPLL channel number or -1
 *
 * The function asks device to update phase offsets latch registers with
 * the latest measured values. There are 2 sets of latch registers:
 *
 * 1) Up to 5 DPLL-to-connected-ref registers that contain phase offset
 *    values between particular DPLL channel and its *connected* input
 *    reference.
 *
 * 2) 10 selected-DPLL-to-all-ref registers that contain phase offset values
 *    between selected DPLL channel and all input references.
 *
 * If the caller is interested in 2) then it has to pass DPLL channel number
 * in @channel parameter. If it is interested only in 1) then it should pass
 * @channel parameter with value of -1.
 *
 * Return: 0 on success, <0 on error
 */
int zl3073x_ref_phase_offsets_update(struct zl3073x_dev *zldev, int channel)
{
	int rc;

	/* Per datasheet we have to wait for 'dpll_ref_phase_err_rqst_rd'
	 * to be zero to ensure that the measured data are coherent.
	 */
	rc = zl3073x_poll_zero_u8(zldev, ZL_REG_REF_PHASE_ERR_READ_RQST,
				  ZL_REF_PHASE_ERR_READ_RQST_RD);
	if (rc)
		return rc;

	/* Select DPLL channel if it is specified */
	if (channel != -1) {
		rc = zl3073x_write_u8(zldev, ZL_REG_DPLL_MEAS_IDX, channel);
		if (rc)
			return rc;
	}

	/* Request to update phase offsets measurement values */
	rc = zl3073x_write_u8(zldev, ZL_REG_REF_PHASE_ERR_READ_RQST,
			      ZL_REF_PHASE_ERR_READ_RQST_RD);
	if (rc)
		return rc;

	/* Wait for finish */
	return zl3073x_poll_zero_u8(zldev, ZL_REG_REF_PHASE_ERR_READ_RQST,
				    ZL_REF_PHASE_ERR_READ_RQST_RD);
}

/**
 * zl3073x_ref_freq_meas_latch - latch reference frequency measurements
 * @zldev: pointer to zl3073x_dev structure
 * @type: measurement type (ZL_REF_FREQ_MEAS_CTRL_*)
 *
 * The function waits for the previous measurement to finish, selects all
 * references and requests a new measurement of the given type.
 *
 * Return: 0 on success, <0 on error
 */
static int
zl3073x_ref_freq_meas_latch(struct zl3073x_dev *zldev, u8 type)
{
	int rc;

	/* Wait for previous measurement to finish */
	rc = zl3073x_poll_zero_u8(zldev, ZL_REG_REF_FREQ_MEAS_CTRL,
				  ZL_REF_FREQ_MEAS_CTRL);
	if (rc)
		return rc;

	/* Select all references for measurement */
	rc = zl3073x_write_u8(zldev, ZL_REG_REF_FREQ_MEAS_MASK_3_0,
			      GENMASK(7, 0)); /* REF0P..REF3N */
	if (rc)
		return rc;
	rc = zl3073x_write_u8(zldev, ZL_REG_REF_FREQ_MEAS_MASK_4,
			      GENMASK(1, 0)); /* REF4P..REF4N */
	if (rc)
		return rc;

	/* Request measurement */
	rc = zl3073x_write_u8(zldev, ZL_REG_REF_FREQ_MEAS_CTRL, type);
	if (rc)
		return rc;

	/* Wait for finish */
	return zl3073x_poll_zero_u8(zldev, ZL_REG_REF_FREQ_MEAS_CTRL,
				    ZL_REF_FREQ_MEAS_CTRL);
}

/**
 * zl3073x_ref_freq_meas_update - update measured input reference frequencies
 * @zldev: pointer to zl3073x_dev structure
 *
 * The function asks device to latch measured input reference frequencies
 * and stores the results in the ref state.
 *
 * Return: 0 on success, <0 on error
 */
static int
zl3073x_ref_freq_meas_update(struct zl3073x_dev *zldev)
{
	int i, rc;

	rc = zl3073x_ref_freq_meas_latch(zldev, ZL_REF_FREQ_MEAS_CTRL_REF_FREQ);
	if (rc)
		return rc;

	/* Read measured frequencies in Hz (unsigned 32-bit, LSB = 1 Hz) */
	for (i = 0; i < ZL3073X_NUM_REFS; i++) {
		u32 value;

		rc = zl3073x_read_u32(zldev, ZL_REG_REF_FREQ(i), &value);
		if (rc)
			return rc;

		zldev->ref[i].meas_freq = value;
	}

	return 0;
}

static void
zl3073x_dev_periodic_work(struct kthread_work *work)
{
	struct zl3073x_dev *zldev = container_of(work, struct zl3073x_dev,
						 work.work);
	struct zl3073x_dpll *zldpll;
	int rc;

	/* Update input references' states */
	zl3073x_dev_ref_states_update(zldev);

	/* Update DPLL channels' states */
	zl3073x_dev_chan_states_update(zldev);

	/* Update DPLL-to-connected-ref phase offsets registers */
	rc = zl3073x_ref_phase_offsets_update(zldev, -1);
	if (rc)
		dev_warn(zldev->dev, "Failed to update phase offsets: %pe\n",
			 ERR_PTR(rc));

	/* Update measured input reference frequencies if frequency
	 * monitoring is enabled.
	 */
	if (zldev->freq_monitor) {
		rc = zl3073x_ref_freq_meas_update(zldev);
		if (rc)
			dev_warn(zldev->dev,
				 "Failed to update measured frequencies: %pe\n",
				 ERR_PTR(rc));
	}

	list_for_each_entry(zldpll, &zldev->dplls, list)
		zl3073x_dpll_changes_check(zldpll);

	/* Run twice a second */
	kthread_queue_delayed_work(zldev->kworker, &zldev->work,
				   msecs_to_jiffies(500));
}

int zl3073x_dev_phase_avg_factor_set(struct zl3073x_dev *zldev, u8 factor)
{
	u8 dpll_meas_ctrl, value;
	int rc;

	/* Read DPLL phase measurement control register */
	rc = zl3073x_read_u8(zldev, ZL_REG_DPLL_MEAS_CTRL, &dpll_meas_ctrl);
	if (rc)
		return rc;

	/* Convert requested factor to register value */
	value = (factor + 1) & 0x0f;

	/* Update phase measurement control register */
	FIELD_MODIFY(ZL_DPLL_MEAS_CTRL_AVG_FACTOR, &dpll_meas_ctrl, value);
	rc = zl3073x_write_u8(zldev, ZL_REG_DPLL_MEAS_CTRL, dpll_meas_ctrl);
	if (rc)
		return rc;

	/* Save the new factor */
	zldev->phase_avg_factor = factor;

	return 0;
}

/**
 * zl3073x_dev_phase_meas_setup - setup phase offset measurement
 * @zldev: pointer to zl3073x_dev structure
 *
 * Enable phase offset measurement block, set measurement averaging factor
 * and enable DPLL-to-its-ref phase measurement for all DPLLs.
 *
 * Returns: 0 on success, <0 on error
 */
static int
zl3073x_dev_phase_meas_setup(struct zl3073x_dev *zldev)
{
	struct zl3073x_dpll *zldpll;
	u8 dpll_meas_ctrl, mask = 0;
	int rc;

	/* Setup phase measurement averaging factor */
	rc = zl3073x_dev_phase_avg_factor_set(zldev, zldev->phase_avg_factor);
	if (rc)
		return rc;

	/* Read DPLL phase measurement control register */
	rc = zl3073x_read_u8(zldev, ZL_REG_DPLL_MEAS_CTRL, &dpll_meas_ctrl);
	if (rc)
		return rc;

	/* Enable DPLL measurement block */
	dpll_meas_ctrl |= ZL_DPLL_MEAS_CTRL_EN;

	/* Update phase measurement control register */
	rc = zl3073x_write_u8(zldev, ZL_REG_DPLL_MEAS_CTRL, dpll_meas_ctrl);
	if (rc)
		return rc;

	/* Enable DPLL-to-connected-ref measurement for each channel */
	list_for_each_entry(zldpll, &zldev->dplls, list)
		mask |= BIT(zldpll->id);

	return zl3073x_write_u8(zldev, ZL_REG_DPLL_PHASE_ERR_READ_MASK, mask);
}

/**
 * zl3073x_dev_start - Start normal operation
 * @zldev: zl3073x device pointer
 * @full: perform full initialization
 *
 * The function starts normal operation, which means registering all DPLLs and
 * their pins, and starting monitoring. If full initialization is requested,
 * the function additionally initializes the phase offset measurement block and
 * fetches hardware-invariant parameters.
 *
 * Return: 0 on success, <0 on error
 */
int zl3073x_dev_start(struct zl3073x_dev *zldev, bool full)
{
	struct zl3073x_dpll *zldpll;
	u8 info;
	int rc;

	rc = zl3073x_read_u8(zldev, ZL_REG_INFO, &info);
	if (rc) {
		dev_err(zldev->dev, "Failed to read device status info\n");
		return rc;
	}

	if (!FIELD_GET(ZL_INFO_READY, info)) {
		/* The ready bit indicates that the firmware was successfully
		 * configured and is ready for normal operation. If it is
		 * cleared then the configuration stored in flash is wrong
		 * or missing. In this situation the driver will expose
		 * only devlink interface to give an opportunity to flash
		 * the correct config.
		 */
		dev_info(zldev->dev,
			 "FW not fully ready - missing or corrupted config\n");

		return 0;
	}

	if (full) {
		/* Fetch device state */
		rc = zl3073x_dev_state_fetch(zldev);
		if (rc)
			return rc;

		/* Setup phase offset measurement block */
		rc = zl3073x_dev_phase_meas_setup(zldev);
		if (rc) {
			dev_err(zldev->dev,
				"Failed to setup phase measurement\n");
			return rc;
		}
	}

	/* Register all DPLLs */
	list_for_each_entry(zldpll, &zldev->dplls, list) {
		rc = zl3073x_dpll_register(zldpll);
		if (rc) {
			dev_err_probe(zldev->dev, rc,
				      "Failed to register DPLL%u\n",
				      zldpll->id);
			return rc;
		}
	}

	/* Perform initial firmware fine phase correction */
	rc = zl3073x_dpll_init_fine_phase_adjust(zldev);
	if (rc) {
		dev_err_probe(zldev->dev, rc,
			      "Failed to init fine phase correction\n");
		return rc;
	}

	/* Start monitoring */
	kthread_queue_delayed_work(zldev->kworker, &zldev->work, 0);

	return 0;
}

/**
 * zl3073x_dev_stop - Stop normal operation
 * @zldev: zl3073x device pointer
 *
 * The function stops the normal operation that mean deregistration of all
 * DPLLs and their pins and stop monitoring.
 *
 * Return: 0 on success, <0 on error
 */
void zl3073x_dev_stop(struct zl3073x_dev *zldev)
{
	struct zl3073x_dpll *zldpll;

	/* Stop monitoring */
	kthread_cancel_delayed_work_sync(&zldev->work);

	/* Unregister all DPLLs */
	list_for_each_entry(zldpll, &zldev->dplls, list) {
		if (zldpll->dpll_dev)
			zl3073x_dpll_unregister(zldpll);
	}
}

static void zl3073x_dev_dpll_fini(void *ptr)
{
	struct zl3073x_dpll *zldpll, *next;
	struct zl3073x_dev *zldev = ptr;

	/* Stop monitoring and unregister DPLLs */
	zl3073x_dev_stop(zldev);

	/* Destroy monitoring thread */
	if (zldev->kworker) {
		kthread_destroy_worker(zldev->kworker);
		zldev->kworker = NULL;
	}

	/* Free all DPLLs */
	list_for_each_entry_safe(zldpll, next, &zldev->dplls, list) {
		list_del(&zldpll->list);
		zl3073x_dpll_free(zldpll);
	}
}

static int
zl3073x_devm_dpll_init(struct zl3073x_dev *zldev)
{
	struct kthread_worker *kworker;
	struct zl3073x_dpll *zldpll;
	unsigned int i;
	int rc;

	INIT_LIST_HEAD(&zldev->dplls);

	/* Allocate all DPLLs */
	for (i = 0; i < zldev->info->num_channels; i++) {
		zldpll = zl3073x_dpll_alloc(zldev, i);
		if (IS_ERR(zldpll)) {
			dev_err_probe(zldev->dev, PTR_ERR(zldpll),
				      "Failed to alloc DPLL%u\n", i);
			rc = PTR_ERR(zldpll);
			goto error;
		}

		list_add_tail(&zldpll->list, &zldev->dplls);
	}

	/* Initialize monitoring thread */
	kthread_init_delayed_work(&zldev->work, zl3073x_dev_periodic_work);
	kworker = kthread_run_worker(0, "zl3073x-%s", dev_name(zldev->dev));
	if (IS_ERR(kworker)) {
		rc = PTR_ERR(kworker);
		goto error;
	}
	zldev->kworker = kworker;

	/* Start normal operation */
	rc = zl3073x_dev_start(zldev, true);
	if (rc) {
		dev_err_probe(zldev->dev, rc, "Failed to start device\n");
		goto error;
	}

	/* Add devres action to release DPLL related resources */
	return devm_add_action_or_reset(zldev->dev, zl3073x_dev_dpll_fini, zldev);

error:
	zl3073x_dev_dpll_fini(zldev);

	return rc;
}

/**
 * zl3073x_dev_probe - initialize zl3073x device
 * @zldev: pointer to zl3073x device
 *
 * Common initialization of zl3073x device structure.
 *
 * Returns: 0 on success, <0 on error
 */
int zl3073x_dev_probe(struct zl3073x_dev *zldev)
{
	u16 id, revision, fw_ver;
	unsigned int i;
	u32 cfg_ver;
	int rc;

	/* Read chip ID */
	rc = zl3073x_read_u16(zldev, ZL_REG_ID, &id);
	if (rc)
		return rc;

	/* Detect chip variant */
	for (i = 0; i < ARRAY_SIZE(zl3073x_chip_ids); i++) {
		if (zl3073x_chip_ids[i].id == id)
			break;
	}

	if (i == ARRAY_SIZE(zl3073x_chip_ids))
		return dev_err_probe(zldev->dev, -ENODEV,
				     "Unknown chip ID: 0x%04x\n", id);

	zldev->info = &zl3073x_chip_ids[i];

	/* Read revision, firmware version and custom config version */
	rc = zl3073x_read_u16(zldev, ZL_REG_REVISION, &revision);
	if (rc)
		return rc;
	rc = zl3073x_read_u16(zldev, ZL_REG_FW_VER, &fw_ver);
	if (rc)
		return rc;
	rc = zl3073x_read_u32(zldev, ZL_REG_CUSTOM_CONFIG_VER, &cfg_ver);
	if (rc)
		return rc;

	dev_dbg(zldev->dev, "ChipID(%X), ChipRev(%X), FwVer(%u)\n", id,
		revision, fw_ver);
	dev_dbg(zldev->dev, "Custom config version: %lu.%lu.%lu.%lu\n",
		FIELD_GET(GENMASK(31, 24), cfg_ver),
		FIELD_GET(GENMASK(23, 16), cfg_ver),
		FIELD_GET(GENMASK(15, 8), cfg_ver),
		FIELD_GET(GENMASK(7, 0), cfg_ver));

	/* Generate random clock ID as the device has not such property that
	 * could be used for this purpose. A user can later change this value
	 * using devlink.
	 */
	zldev->clock_id = get_random_u64();

	/* Default phase offset averaging factor */
	zldev->phase_avg_factor = 2;

	/* Initialize mutex for operations where multiple reads, writes
	 * and/or polls are required to be done atomically.
	 */
	rc = devm_mutex_init(zldev->dev, &zldev->multiop_lock);
	if (rc)
		return dev_err_probe(zldev->dev, rc,
				     "Failed to initialize mutex\n");

	/* Register DPLL channels */
	rc = zl3073x_devm_dpll_init(zldev);
	if (rc)
		return rc;

	/* Register the devlink instance and parameters */
	rc = zl3073x_devlink_register(zldev);
	if (rc)
		return dev_err_probe(zldev->dev, rc,
				     "Failed to register devlink instance\n");

	return 0;
}
EXPORT_SYMBOL_NS_GPL(zl3073x_dev_probe, "ZL3073X");

MODULE_AUTHOR("Ivan Vecera <ivecera@redhat.com>");
MODULE_DESCRIPTION("Microchip ZL3073x core driver");
MODULE_LICENSE("GPL");