/*
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 *
 * GPL LICENSE SUMMARY
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 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
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 * in the file called LICENSE.GPL.
 *
 * BSD LICENSE
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#ifndef _SCIC_SDS_PHY_H_
#define _SCIC_SDS_PHY_H_

#include "sas.h"
#include "scic_phy.h"
#include "scu_registers.h"
#include "sci_base_state_machine.h"
#include <scsi/libsas.h>

struct scic_sds_port;
/**
 *
 *
 * This is the timeout value for the SATA phy to wait for a SIGNATURE FIS
 * before restarting the starting state machine.  Technically, the old parallel
 * ATA specification required up to 30 seconds for a device to issue its
 * signature FIS as a result of a soft reset.  Now we see that devices respond
 * generally within 15 seconds, but we'll use 25 for now.
 */
#define SCIC_SDS_SIGNATURE_FIS_TIMEOUT    25000

/**
 *
 *
 * This is the timeout for the SATA OOB/SN because the hardware does not
 * recognize a hot plug after OOB signal but before the SN signals.  We need to
 * make sure after a hotplug timeout if we have not received the speed event
 * notification from the hardware that we restart the hardware OOB state
 * machine.
 */
#define SCIC_SDS_SATA_LINK_TRAINING_TIMEOUT  250

enum scic_sds_phy_states {
	/**
	 * Simply the initial state for the base domain state machine.
	 */
	SCI_BASE_PHY_STATE_INITIAL,

	/**
	 * This state indicates that the phy has successfully been stopped.
	 * In this state no new IO operations are permitted on this phy.
	 * This state is entered from the INITIAL state.
	 * This state is entered from the STARTING state.
	 * This state is entered from the READY state.
	 * This state is entered from the RESETTING state.
	 */
	SCI_BASE_PHY_STATE_STOPPED,

	/**
	 * This state indicates that the phy is in the process of becomming
	 * ready.  In this state no new IO operations are permitted on this phy.
	 * This state is entered from the STOPPED state.
	 * This state is entered from the READY state.
	 * This state is entered from the RESETTING state.
	 */
	SCI_BASE_PHY_STATE_STARTING,

	/**
	 * This state indicates the the phy is now ready.  Thus, the user
	 * is able to perform IO operations utilizing this phy as long as it
	 * is currently part of a valid port.
	 * This state is entered from the STARTING state.
	 */
	SCI_BASE_PHY_STATE_READY,

	/**
	 * This state indicates that the phy is in the process of being reset.
	 * In this state no new IO operations are permitted on this phy.
	 * This state is entered from the READY state.
	 */
	SCI_BASE_PHY_STATE_RESETTING,

	/**
	 * Simply the final state for the base phy state machine.
	 */
	SCI_BASE_PHY_STATE_FINAL,
};


/**
 * enum scic_sds_phy_starting_substates -
 *
 *
 */
enum scic_sds_phy_starting_substates {
	/**
	 * Initial state
	 */
	SCIC_SDS_PHY_STARTING_SUBSTATE_INITIAL,

	/**
	 * Wait state for the hardware OSSP event type notification
	 */
	SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_OSSP_EN,

	/**
	 * Wait state for the PHY speed notification
	 */
	SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SAS_SPEED_EN,

	/**
	 * Wait state for the IAF Unsolicited frame notification
	 */
	SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_IAF_UF,

	/**
	 * Wait state for the request to consume power
	 */
	SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SAS_POWER,

	/**
	 * Wait state for request to consume power
	 */
	SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SATA_POWER,

	/**
	 * Wait state for the SATA PHY notification
	 */
	SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SATA_PHY_EN,

	/**
	 * Wait for the SATA PHY speed notification
	 */
	SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SATA_SPEED_EN,

	/**
	 * Wait state for the SIGNATURE FIS unsolicited frame notification
	 */
	SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SIG_FIS_UF,

	/**
	 * Exit state for this state machine
	 */
	SCIC_SDS_PHY_STARTING_SUBSTATE_FINAL,
};

struct scic_sds_port;
struct scic_sds_controller;

/**
 * This enumeration provides a named phy type for the state machine
 *
 *
 */
enum scic_sds_phy_protocol {
	/**
	 * This is an unknown phy type since there is either nothing on the other
	 * end or we have not detected the phy type as yet.
	 */
	SCIC_SDS_PHY_PROTOCOL_UNKNOWN,

	/**
	 * This is a SAS PHY
	 */
	SCIC_SDS_PHY_PROTOCOL_SAS,

	/**
	 * This is a SATA PHY
	 */
	SCIC_SDS_PHY_PROTOCOL_SATA,

	SCIC_SDS_MAX_PHY_PROTOCOLS
};

/**
 * struct scic_sds_phy - This structure  contains or references all of the data
 *    necessary to represent the core phy object and SCU harware protocol
 *    engine.
 *
 *
 */
struct scic_sds_phy {
	/**
	 * This field contains the information for the base phy state machine.
	 */
	struct sci_base_state_machine state_machine;

	/**
	 * This field specifies the port object that owns/contains this phy.
	 */
	struct scic_sds_port *owning_port;

	/**
	 * This field indicates whether the phy supports 1.5 Gb/s, 3.0 Gb/s,
	 * or 6.0 Gb/s operation.
	 */
	enum sas_linkrate max_negotiated_speed;

	/**
	 * This member specifies the protocol being utilized on this phy.  This
	 * field contains a legitamite value once the PHY has link trained with
	 * a remote phy.
	 */
	enum scic_sds_phy_protocol protocol;

	/**
	 * This field specifies the index with which this phy is associated (0-3).
	 */
	u8 phy_index;

	/**
	 * This member indicates if this particular PHY has received a BCN while
	 * it had no port assignement.  This BCN will be reported once the phy is
	 * assigned to a port.
	 */
	bool bcn_received_while_port_unassigned;

	/**
	 * This field indicates if this PHY is currently in the process of
	 * link training (i.e. it has started OOB, but has yet to perform
	 * IAF exchange/Signature FIS reception).
	 */
	bool is_in_link_training;

	/**
	 * This field contains a reference to the timer utilized in detecting
	 * when a signature FIS timeout has occurred.  The signature FIS is the
	 * first FIS sent by an attached SATA device after OOB/SN.
	 */
	void *sata_timeout_timer;

	const struct scic_sds_phy_state_handler *state_handlers;

	struct sci_base_state_machine starting_substate_machine;

	/**
	 * This field is the pointer to the transport layer register for the SCU
	 * hardware.
	 */
	struct scu_transport_layer_registers __iomem *transport_layer_registers;

	/**
	 * This field points to the link layer register set within the SCU.
	 */
	struct scu_link_layer_registers __iomem *link_layer_registers;

};

typedef enum sci_status (*scic_sds_phy_handler_t)(struct scic_sds_phy *);
typedef enum sci_status (*scic_sds_phy_event_handler_t)(struct scic_sds_phy *, u32);
typedef enum sci_status (*scic_sds_phy_frame_handler_t)(struct scic_sds_phy *, u32);
typedef enum sci_status (*scic_sds_phy_power_handler_t)(struct scic_sds_phy *);

/**
 * struct scic_sds_phy_state_handler -
 *
 *
 */
struct scic_sds_phy_state_handler {
	/**
	 * The start_handler specifies the method invoked when there is an
	 * attempt to start a phy.
	 */
	scic_sds_phy_handler_t start_handler;

	/**
	 * The stop_handler specifies the method invoked when there is an
	 * attempt to stop a phy.
	 */
	scic_sds_phy_handler_t stop_handler;

	/**
	 * The reset_handler specifies the method invoked when there is an
	 * attempt to reset a phy.
	 */
	scic_sds_phy_handler_t reset_handler;

	/**
	 * The destruct_handler specifies the method invoked when attempting to
	 * destruct a phy.
	 */
	scic_sds_phy_handler_t destruct_handler;

	/**
	 * The state handler for unsolicited frames received from the SCU hardware.
	 */
	scic_sds_phy_frame_handler_t frame_handler;

	/**
	 * The state handler for events received from the SCU hardware.
	 */
	scic_sds_phy_event_handler_t event_handler;

	/**
	 * The state handler for staggered spinup.
	 */
	scic_sds_phy_power_handler_t consume_power_handler;

};

/**
 * scic_sds_phy_get_index() -
 *
 * This macro returns the phy index for the specified phy
 */
#define scic_sds_phy_get_index(phy) \
	((phy)->phy_index)

/**
 * scic_sds_phy_get_controller() - This macro returns the controller for this
 *    phy
 *
 *
 */
#define scic_sds_phy_get_controller(phy) \
	(scic_sds_port_get_controller((phy)->owning_port))

/**
 * scic_sds_phy_set_state_handlers() - This macro sets the state handlers for
 *    this phy object
 *
 *
 */
#define scic_sds_phy_set_state_handlers(phy, handlers) \
	((phy)->state_handlers = (handlers))

/**
 * scic_sds_phy_set_base_state_handlers() -
 *
 * This macro set the base state handlers for the phy object.
 */
#define scic_sds_phy_set_base_state_handlers(phy, state_id) \
	scic_sds_phy_set_state_handlers(\
		(phy), \
		&scic_sds_phy_state_handler_table[(state_id)] \
		)

void scic_sds_phy_construct(
	struct scic_sds_phy *this_phy,
	struct scic_sds_port *owning_port,
	u8 phy_index);

struct scic_sds_port *scic_sds_phy_get_port(
	struct scic_sds_phy *this_phy);

void scic_sds_phy_set_port(
	struct scic_sds_phy *this_phy,
	struct scic_sds_port *owning_port);

enum sci_status scic_sds_phy_initialize(
	struct scic_sds_phy *this_phy,
	struct scu_transport_layer_registers __iomem *transport_layer_registers,
	struct scu_link_layer_registers __iomem *link_layer_registers);

enum sci_status scic_sds_phy_start(
	struct scic_sds_phy *this_phy);

enum sci_status scic_sds_phy_stop(
	struct scic_sds_phy *this_phy);

enum sci_status scic_sds_phy_reset(
	struct scic_sds_phy *this_phy);

void scic_sds_phy_resume(
	struct scic_sds_phy *this_phy);

void scic_sds_phy_setup_transport(
	struct scic_sds_phy *this_phy,
	u32 device_id);

enum sci_status scic_sds_phy_event_handler(
	struct scic_sds_phy *this_phy,
	u32 event_code);

enum sci_status scic_sds_phy_frame_handler(
	struct scic_sds_phy *this_phy,
	u32 frame_index);

enum sci_status scic_sds_phy_consume_power_handler(
	struct scic_sds_phy *this_phy);

void scic_sds_phy_get_sas_address(
	struct scic_sds_phy *this_phy,
	struct sci_sas_address *sas_address);

void scic_sds_phy_get_attached_sas_address(
	struct scic_sds_phy *this_phy,
	struct sci_sas_address *sas_address);

void scic_sds_phy_get_protocols(
	struct scic_sds_phy *sci_phy,
	struct scic_phy_proto *protocols);

#endif /* _SCIC_SDS_PHY_H_ */