xref: /freebsd-11-stable/sys/contrib/alpine-hal/eth/al_hal_eth_kr.h

/*-
*******************************************************************************
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*******************************************************************************/
/**
 * @defgroup group_eth_kr_api API
 * Ethernet KR auto-neg and link-training driver API
 * @ingroup group_eth
 * @{
 * @file   al_hal_eth_kr.h
 *
 * @brief Header file for KR driver
 *
 *
 */

#ifndef __AL_HAL_ETH_KR_H__
#define __AL_HAL_ETH_KR_H__

#include "al_hal_eth.h"

/* *INDENT-OFF* */
#ifdef __cplusplus
extern "C" {
#endif
/* *INDENT-ON* */

/* AN (Auto-negotiation) Advertisement Registers */
struct al_eth_an_adv {
	/* constant value defining 802.3ap support.
	 * The suggested value is 0x01.*/
	uint8_t   selector_field;
	/* Contains arbitrary data. */
	uint8_t   echoed_nonce;
	/* pause capability. */
	uint8_t   capability;
	/* Set to 1 to indicate a Remote Fault condition.
	 * Set to 0 to indicate normal operation.*/
	uint8_t   remote_fault;
	/* Should always be set to 0. */
	uint8_t   acknowledge;
	/* Set to 1 to indicate that the device has next pages to send.
	 * Set to 0 to indicate that that device has no next pages to send. */
	uint8_t   next_page;
	/* Must be set to an arbitrary value.
	 * Two devices must have a different nonce for autonegotiation to
	 * operate (a loopback will not allow autonegotiation to complete). */
	uint8_t   transmitted_nonce;
	uint32_t  technology;
#define AL_ETH_AN_TECH_1000BASE_KX  AL_BIT(0)
#define AL_ETH_AN_TECH_10GBASE_KX4  AL_BIT(1)
#define AL_ETH_AN_TECH_10GBASE_KR   AL_BIT(2)
#define AL_ETH_AN_TECH_40GBASE_KR4  AL_BIT(3)
#define AL_ETH_AN_TECH_40GBASE_CR4  AL_BIT(4)
#define AL_ETH_AN_TECH_100GBASE_CR  AL_BIT(5)
	uint8_t   fec_capability;
};

/* AN next page fields */
struct al_eth_an_np {
	/* These bits can be used as message code field or unformatted code field.
	 * When msg_page is true, these bits represent message code field.
	 * Predefined message code field Code Field should be used as specified in the standard
	 * 802.3ap.
	 * For the null message code the value is 0x01.
	 */
	uint16_t	unformatted_code_field;
	/* Flag to keep track of the state of the local device's Toggle bit.
	 * Initial value is taken from base page. Set to 0.
	 */
	al_bool		toggle;
	/* Acknowledge 2 is used to indicate that the receiver is able to act on the information
	 * (or perform the task) defined in the message.
	 */
	al_bool		ack2;
	al_bool		msg_page;
	/* If the device does not have any more Next Pages to send, set to AL_FALSE */
	al_bool		next_page;
	uint16_t	unformatted_code_field1;
	uint16_t	unformatted_code_field2;
};

enum al_eth_kr_cl72_cstate {
	C72_CSTATE_NOT_UPDATED = 0,
	C72_CSTATE_UPDATED = 1,
	C72_CSTATE_MIN = 2,
	C72_CSTATE_MAX = 3,
};

enum al_eth_kr_cl72_coef_op {
	AL_PHY_KR_COEF_UP_HOLD = 0,
	AL_PHY_KR_COEF_UP_INC = 1,
	AL_PHY_KR_COEF_UP_DEC = 2,
	AL_PHY_KR_COEF_UP_RESERVED = 3
};

struct al_eth_kr_coef_up_data {
	enum al_eth_kr_cl72_coef_op c_zero;
	enum al_eth_kr_cl72_coef_op c_plus;
	enum al_eth_kr_cl72_coef_op c_minus;
	al_bool preset;
	al_bool initialize;
};

struct al_eth_kr_status_report_data {
	enum al_eth_kr_cl72_cstate c_zero;
	enum al_eth_kr_cl72_cstate c_plus;
	enum al_eth_kr_cl72_cstate c_minus;
	al_bool receiver_ready;
};

enum al_eth_an_lt_lane {
	AL_ETH_AN__LT_LANE_0,
	AL_ETH_AN__LT_LANE_1,
	AL_ETH_AN__LT_LANE_2,
	AL_ETH_AN__LT_LANE_3,
};

/**
 * get the last received coefficient update message from the link partner
 *
 * @param adapter pointer to the private structure
 * @param lane lane number
 * @param lpcoeff coeff update received
 *
 */
void al_eth_lp_coeff_up_get(
			struct al_hal_eth_adapter *adapter,
			enum al_eth_an_lt_lane lane,
			struct al_eth_kr_coef_up_data *lpcoeff);

/**
 * get the last received status report message from the link partner
 *
 * @param adapter pointer to the private structure
 * @param lane lane number
 * @param status status report received
 *
 */
void al_eth_lp_status_report_get(
			struct al_hal_eth_adapter *adapter,
			enum al_eth_an_lt_lane lane,
			struct al_eth_kr_status_report_data *status);

/**
 * set the coefficient data for the next message that will be sent to lp
 *
 * @param adapter pointer to the private structure
 * @param lane lane number
 * @param ldcoeff coeff update to send
 *
 */
void al_eth_ld_coeff_up_set(
			struct al_hal_eth_adapter *adapter,
			enum al_eth_an_lt_lane lane,
			struct al_eth_kr_coef_up_data *ldcoeff);

/**
 * set the status report message for the next message that will be sent to lp
 *
 * @param adapter pointer to the private structure
 * @param lane lane number
 * @param status status report to send
 *
 */
void al_eth_ld_status_report_set(
			struct al_hal_eth_adapter *adapter,
			enum al_eth_an_lt_lane lane,
			struct al_eth_kr_status_report_data *status);

/**
 * get the receiver frame lock status
 *
 * @param adapter pointer to the private structure
 * @param lane lane number
 *
 * @return true if Training frame delineation is detected, otherwise false.
 */
al_bool al_eth_kr_receiver_frame_lock_get(struct al_hal_eth_adapter *adapter,
					  enum al_eth_an_lt_lane lane);

/**
 * get the start up protocol progress status
 *
 * @param adapter pointer to the private structure
 * @param lane lane number
 *
 * @return true if the startup protocol is in progress.
 */
al_bool al_eth_kr_startup_proto_prog_get(struct al_hal_eth_adapter *adapter,
					 enum al_eth_an_lt_lane lane);

/**
 * indicate the receiver is ready (the link training is completed)
 *
 * @param adapter pointer to the private structure
 * @param lane lane number
 *
 */
void al_eth_receiver_ready_set(struct al_hal_eth_adapter *adapter,
			       enum al_eth_an_lt_lane lane);

/**
 * read Training failure status.
 *
 * @param adapter pointer to the private structure
 * @param lane lane number
 *
 *@return true if Training failure has been detected.
 */
al_bool al_eth_kr_training_status_fail_get(struct al_hal_eth_adapter *adapter,
					   enum al_eth_an_lt_lane lane);

/****************************** auto negotiation *******************************/
/**
 * Initialize Auto-negotiation
 * - Program Ability Registers (Advertisement Registers)
 * - Clear Status latches
 * @param adapter pointer to the private structure
 * @param an_adv pointer to the AN Advertisement Registers structure
 *        when NULL, the registers will not be updated.
 *
 * @return 0 on success. otherwise on failure.
 */
int al_eth_kr_an_init(struct al_hal_eth_adapter *adapter,
		      struct al_eth_an_adv *an_adv);

/**
 * Enable/Restart Auto-negotiation
 *
 * @param adapter pointer to the private structure
 * @param lane lane number
 * @param lt_enable initialize link training as well
 *
 * @return 0 on success. otherwise on failure.
 */
int al_eth_kr_an_start(struct al_hal_eth_adapter *adapter,
		       enum al_eth_an_lt_lane lane,
		       al_bool next_page_enable,
		       al_bool lt_enable);


int al_eth_kr_next_page_write(struct al_hal_eth_adapter *adapter,
			      struct al_eth_an_np *np);

int al_eth_kr_next_page_read(struct al_hal_eth_adapter *adapter,
			     struct al_eth_an_np *np);

/**
 * Stop Auto-negotiation
 *
 * Stopping the auto-negotiation will prevent the mac from sending the last page
 * to the link partner in case it start the AN again. It must be called after
 * link training is completed or the software will lose sync with the HW state
 * machine
 *
 * @param adapter pointer to the private structure
 *
 */
void al_eth_kr_an_stop(struct al_hal_eth_adapter *adapter);

/**
 *  Check Auto-negotiation event done
 *
 * @param adapter pointer to the private structure
 * @param page_received	Set to true if the AN page received indication is set.
 *			Set to false otherwise.
 * @param an_completed	Set to true of the AN completed indication is set.
 *			Set to false otherwise.
 * @param error	Set to true if any error encountered
 *
 */
void al_eth_kr_an_status_check(struct al_hal_eth_adapter *adapter,
			      al_bool *page_received,
			      al_bool *an_completed,
			      al_bool *error);

/**
 *  Read the remote auto-negotiation advertising.
 *  This function is safe to called after al_eth_kr_an_status_check returned
 *  with page_received set.
 *
 * @param adapter pointer to the private structure
 * @param an_adv pointer to the AN Advertisement Registers structure
 *
 */
void al_eth_kr_an_read_adv(struct al_hal_eth_adapter *adapter,
			   struct al_eth_an_adv *an_adv);

/****************************** link training **********************************/
/**
 *  Initialize Link-training.
 *  Clear the status register and set the local coefficient update and status
 *  to zero.
 *
 * @param adapter pointer to the private structure
 * @param lane lane number
 *
 */
void al_eth_kr_lt_initialize(struct al_hal_eth_adapter *adapter,
			     enum al_eth_an_lt_lane lane);

/**
 * Wait for frame lock.
 *
 * @param adapter pointer to the private structure
 * @param lane lane number
 * @param timeout timeout in usec.
 *
 * @return true if frame lock received. false otherwise.
 */
al_bool al_eth_kr_lt_frame_lock_wait(struct al_hal_eth_adapter *adapter,
				     enum al_eth_an_lt_lane lane,
				     uint32_t timeout);

/**
 * reset the 10GBase- KR startup protocol and begin its operation
 *
 * @param adapter pointer to the private structure
 * @param lane lane number
 *
 */
void al_eth_kr_lt_restart(struct al_hal_eth_adapter *adapter,
			  enum al_eth_an_lt_lane lane);

/**
 * reset the 10GBase- KR startup protocol and end its operation
 *
 * @param adapter pointer to the private structure
 * @param lane lane number
 *
 */
void al_eth_kr_lt_stop(struct al_hal_eth_adapter *adapter,
		       enum al_eth_an_lt_lane lane);

#ifdef __cplusplus
}
#endif
/* *INDENT-ON* */
#endif /*__AL_HAL_ETH_KR_H__*/
/** @} end of Ethernet kr group */