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/*

 * Copyright © 2014 Red Hat.

 *

 * Permission to use, copy, modify, distribute, and sell this software and its

 * documentation for any purpose is hereby granted without fee, provided that

 * the above copyright notice appear in all copies and that both that copyright

 * notice and this permission notice appear in supporting documentation, and

 * that the name of the copyright holders not be used in advertising or

 * publicity pertaining to distribution of the software without specific,

 * written prior permission.  The copyright holders make no representations

 * about the suitability of this software for any purpose.  It is provided "as

 * is" without express or implied warranty.

 *

 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,

 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO

 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR

 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,

 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER

 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE

 * OF THIS SOFTWARE.

 */

#ifndef _DRM_DP_MST_HELPER_H_

#define _DRM_DP_MST_HELPER_H_

#include 

#include 

struct drm_dp_mst_branch;

/**

 * struct drm_dp_vcpi - Virtual Channel Payload Identifer

 * @vcpi: Virtual channel ID.

 * @pbn: Payload Bandwidth Number for this channel

 * @aligned_pbn: PBN aligned with slot size

 * @num_slots: number of slots for this PBN

 */

struct drm_dp_vcpi {

	int vcpi;

	int pbn;

	int aligned_pbn;

	int num_slots;

};

/**

 * struct drm_dp_mst_port - MST port

 * @kref: reference count for this port.

 * @guid_valid: for DP 1.2 devices if we have validated the GUID.

 * @guid: guid for DP 1.2 device on this port.

 * @port_num: port number

 * @input: if this port is an input port.

 * @mcs: message capability status - DP 1.2 spec.

 * @ddps: DisplayPort Device Plug Status - DP 1.2

 * @pdt: Peer Device Type

 * @ldps: Legacy Device Plug Status

 * @dpcd_rev: DPCD revision of device on this port

 * @num_sdp_streams: Number of simultaneous streams

 * @num_sdp_stream_sinks: Number of stream sinks

 * @available_pbn: Available bandwidth for this port.

 * @next: link to next port on this branch device

 * @mstb: branch device attach below this port

 * @aux: i2c aux transport to talk to device connected to this port.

 * @parent: branch device parent of this port

 * @vcpi: Virtual Channel Payload info for this port.

 * @connector: DRM connector this port is connected to.

 * @mgr: topology manager this port lives under.

 *

 * This structure represents an MST port endpoint on a device somewhere

 * in the MST topology.

 */

struct drm_dp_mst_port {

	struct kref kref;

	/* if dpcd 1.2 device is on this port - its GUID info */

	bool guid_valid;

	u8 guid[16];

	u8 port_num;

	bool input;

	bool mcs;

	bool ddps;

	u8 pdt;

	bool ldps;

	u8 dpcd_rev;

	u8 num_sdp_streams;

	u8 num_sdp_stream_sinks;

	uint16_t available_pbn;

	struct list_head next;

	struct drm_dp_mst_branch *mstb; /* pointer to an mstb if this port has one */

	struct drm_dp_aux aux; /* i2c bus for this port? */

	struct drm_dp_mst_branch *parent;

	struct drm_dp_vcpi vcpi;

	struct drm_connector *connector;

	struct drm_dp_mst_topology_mgr *mgr;

};

/**

 * struct drm_dp_mst_branch - MST branch device.

 * @kref: reference count for this port.

 * @rad: Relative Address to talk to this branch device.

 * @lct: Link count total to talk to this branch device.

 * @num_ports: number of ports on the branch.

 * @msg_slots: one bit per transmitted msg slot.

 * @ports: linked list of ports on this branch.

 * @port_parent: pointer to the port parent, NULL if toplevel.

 * @mgr: topology manager for this branch device.

 * @tx_slots: transmission slots for this device.

 * @last_seqno: last sequence number used to talk to this.

 * @link_address_sent: if a link address message has been sent to this device yet.

 *

 * This structure represents an MST branch device, there is one

 * primary branch device at the root, along with any others connected

 * to downstream ports

 */

struct drm_dp_mst_branch {

	struct kref kref;

	u8 rad[8];

	u8 lct;

	int num_ports;

	int msg_slots;

	struct list_head ports;

	/* list of tx ops queue for this port */

	struct drm_dp_mst_port *port_parent;

	struct drm_dp_mst_topology_mgr *mgr;

	/* slots are protected by mstb->mgr->qlock */

	struct drm_dp_sideband_msg_tx *tx_slots[2];

	int last_seqno;

	bool link_address_sent;

};

/* sideband msg header - not bit struct */

struct drm_dp_sideband_msg_hdr {

	u8 lct;

	u8 lcr;

	u8 rad[8];

	bool broadcast;

	bool path_msg;

	u8 msg_len;

	bool somt;

	bool eomt;

	bool seqno;

};

struct drm_dp_nak_reply {

	u8 guid[16];

	u8 reason;

	u8 nak_data;

};

struct drm_dp_link_address_ack_reply {

	u8 guid[16];

	u8 nports;

	struct drm_dp_link_addr_reply_port {

		bool input_port;

		u8 peer_device_type;

		u8 port_number;

		bool mcs;

		bool ddps;

		bool legacy_device_plug_status;

		u8 dpcd_revision;

		u8 peer_guid[16];

		u8 num_sdp_streams;

		u8 num_sdp_stream_sinks;

	} ports[16];

};

struct drm_dp_remote_dpcd_read_ack_reply {

	u8 port_number;

	u8 num_bytes;

	u8 bytes[255];

};

struct drm_dp_remote_dpcd_write_ack_reply {

	u8 port_number;

};

struct drm_dp_remote_dpcd_write_nak_reply {

	u8 port_number;

	u8 reason;

	u8 bytes_written_before_failure;

};

struct drm_dp_remote_i2c_read_ack_reply {

	u8 port_number;

	u8 num_bytes;

	u8 bytes[255];

};

struct drm_dp_remote_i2c_read_nak_reply {

	u8 port_number;

	u8 nak_reason;

	u8 i2c_nak_transaction;

};

struct drm_dp_remote_i2c_write_ack_reply {

	u8 port_number;

};

struct drm_dp_sideband_msg_rx {

	u8 chunk[48];

	u8 msg[256];

	u8 curchunk_len;

	u8 curchunk_idx; /* chunk we are parsing now */

	u8 curchunk_hdrlen;

	u8 curlen; /* total length of the msg */

	bool have_somt;

	bool have_eomt;

	struct drm_dp_sideband_msg_hdr initial_hdr;

};

struct drm_dp_allocate_payload {

	u8 port_number;

	u8 number_sdp_streams;

	u8 vcpi;

	u16 pbn;

	u8 sdp_stream_sink[8];

};

struct drm_dp_allocate_payload_ack_reply {

	u8 port_number;

	u8 vcpi;

	u16 allocated_pbn;

};

struct drm_dp_connection_status_notify {

	u8 guid[16];

	u8 port_number;

	bool legacy_device_plug_status;

	bool displayport_device_plug_status;

	bool message_capability_status;

	bool input_port;

	u8 peer_device_type;

};

struct drm_dp_remote_dpcd_read {

	u8 port_number;

	u32 dpcd_address;

	u8 num_bytes;

};

struct drm_dp_remote_dpcd_write {

	u8 port_number;

	u32 dpcd_address;

	u8 num_bytes;

	u8 *bytes;

};

struct drm_dp_remote_i2c_read {

	u8 num_transactions;

	u8 port_number;

	struct {

		u8 i2c_dev_id;

		u8 num_bytes;

		u8 *bytes;

		u8 no_stop_bit;

		u8 i2c_transaction_delay;

	} transactions[4];

	u8 read_i2c_device_id;

	u8 num_bytes_read;

};

struct drm_dp_remote_i2c_write {

	u8 port_number;

	u8 write_i2c_device_id;

	u8 num_bytes;

	u8 *bytes;

};

/* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */

struct drm_dp_port_number_req {

	u8 port_number;

};

struct drm_dp_enum_path_resources_ack_reply {

	u8 port_number;

	u16 full_payload_bw_number;

	u16 avail_payload_bw_number;

};

/* covers POWER_DOWN_PHY, POWER_UP_PHY */

struct drm_dp_port_number_rep {

	u8 port_number;

};

struct drm_dp_query_payload {

	u8 port_number;

	u8 vcpi;

};

struct drm_dp_resource_status_notify {

	u8 port_number;

	u8 guid[16];

	u16 available_pbn;

};

struct drm_dp_query_payload_ack_reply {

	u8 port_number;

	u8 allocated_pbn;

};

struct drm_dp_sideband_msg_req_body {

	u8 req_type;

	union ack_req {

		struct drm_dp_connection_status_notify conn_stat;

		struct drm_dp_port_number_req port_num;

		struct drm_dp_resource_status_notify resource_stat;

		struct drm_dp_query_payload query_payload;

		struct drm_dp_allocate_payload allocate_payload;

		struct drm_dp_remote_dpcd_read dpcd_read;

		struct drm_dp_remote_dpcd_write dpcd_write;

		struct drm_dp_remote_i2c_read i2c_read;

		struct drm_dp_remote_i2c_write i2c_write;

	} u;

};

struct drm_dp_sideband_msg_reply_body {

	u8 reply_type;

	u8 req_type;

	union ack_replies {

		struct drm_dp_nak_reply nak;

		struct drm_dp_link_address_ack_reply link_addr;

		struct drm_dp_port_number_rep port_number;

		struct drm_dp_enum_path_resources_ack_reply path_resources;

		struct drm_dp_allocate_payload_ack_reply allocate_payload;

		struct drm_dp_query_payload_ack_reply query_payload;

		struct drm_dp_remote_dpcd_read_ack_reply remote_dpcd_read_ack;

		struct drm_dp_remote_dpcd_write_ack_reply remote_dpcd_write_ack;

		struct drm_dp_remote_dpcd_write_nak_reply remote_dpcd_write_nack;

		struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack;

		struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack;

		struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack;

	} u;

};

/* msg is queued to be put into a slot */

#define DRM_DP_SIDEBAND_TX_QUEUED 0

/* msg has started transmitting on a slot - still on msgq */

#define DRM_DP_SIDEBAND_TX_START_SEND 1

/* msg has finished transmitting on a slot - removed from msgq only in slot */

#define DRM_DP_SIDEBAND_TX_SENT 2

/* msg has received a response - removed from slot */

#define DRM_DP_SIDEBAND_TX_RX 3

#define DRM_DP_SIDEBAND_TX_TIMEOUT 4

struct drm_dp_sideband_msg_tx {

	u8 msg[256];

	u8 chunk[48];

	u8 cur_offset;

	u8 cur_len;

	struct drm_dp_mst_branch *dst;

	struct list_head next;

	int seqno;

	int state;

	bool path_msg;

	struct drm_dp_sideband_msg_reply_body reply;

};

/* sideband msg handler */

struct drm_dp_mst_topology_mgr;

struct drm_dp_mst_topology_cbs {

	/* create a connector for a port */

	struct drm_connector *(*add_connector)(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, char *path);

	void (*destroy_connector)(struct drm_dp_mst_topology_mgr *mgr,

				  struct drm_connector *connector);

	void (*hotplug)(struct drm_dp_mst_topology_mgr *mgr);

};

#define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8)

#define DP_PAYLOAD_LOCAL 1

#define DP_PAYLOAD_REMOTE 2

#define DP_PAYLOAD_DELETE_LOCAL 3

struct drm_dp_payload {

	int payload_state;

	int start_slot;

	int num_slots;

};

/**

 * struct drm_dp_mst_topology_mgr - DisplayPort MST manager

 * @dev: device pointer for adding i2c devices etc.

 * @cbs: callbacks for connector addition and destruction.

 * @max_dpcd_transaction_bytes - maximum number of bytes to read/write in one go.

 * @aux: aux channel for the DP connector.

 * @max_payloads: maximum number of payloads the GPU can generate.

 * @conn_base_id: DRM connector ID this mgr is connected to.

 * @down_rep_recv: msg receiver state for down replies.

 * @up_req_recv: msg receiver state for up requests.

 * @lock: protects mst state, primary, guid, dpcd.

 * @mst_state: if this manager is enabled for an MST capable port.

 * @mst_primary: pointer to the primary branch device.

 * @guid_valid: GUID valid for the primary branch device.

 * @guid: GUID for primary port.

 * @dpcd: cache of DPCD for primary port.

 * @pbn_div: PBN to slots divisor.

 *

 * This struct represents the toplevel displayport MST topology manager.

 * There should be one instance of this for every MST capable DP connector

 * on the GPU.

 */

struct drm_dp_mst_topology_mgr {

	struct device *dev;

	struct drm_dp_mst_topology_cbs *cbs;

	int max_dpcd_transaction_bytes;

	struct drm_dp_aux *aux; /* auxch for this topology mgr to use */

	int max_payloads;

	int conn_base_id;

	/* only ever accessed from the workqueue - which should be serialised */

	struct drm_dp_sideband_msg_rx down_rep_recv;

	struct drm_dp_sideband_msg_rx up_req_recv;

	/* pointer to info about the initial MST device */

	struct mutex lock; /* protects mst_state + primary + guid + dpcd */

	bool mst_state;

	struct drm_dp_mst_branch *mst_primary;

	/* primary MST device GUID */

	bool guid_valid;

	u8 guid[16];

	u8 dpcd[DP_RECEIVER_CAP_SIZE];

	u8 sink_count;

	int pbn_div;

	int total_slots;

	int avail_slots;

	int total_pbn;

	/* messages to be transmitted */

	/* qlock protects the upq/downq and in_progress,

	   the mstb tx_slots and txmsg->state once they are queued */

    struct mutex qlock;

	struct list_head tx_msg_downq;

	struct list_head tx_msg_upq;

	bool tx_down_in_progress;

	bool tx_up_in_progress;

	/* payload info + lock for it */

	struct mutex payload_lock;

	struct drm_dp_vcpi **proposed_vcpis;

	struct drm_dp_payload *payloads;

	unsigned long payload_mask;

	wait_queue_head_t tx_waitq;

	struct work_struct work;

	struct work_struct tx_work;

};

int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, struct device *dev, struct drm_dp_aux *aux, int max_dpcd_transaction_bytes, int max_payloads, int conn_base_id);

void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr);

int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state);

int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled);

enum drm_connector_status drm_dp_mst_detect_port(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);

struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);

int drm_dp_calc_pbn_mode(int clock, int bpp);

bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots);

void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);

void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,

				struct drm_dp_mst_port *port);

int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,

			   int pbn);

int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr);

int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr);

int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr);

void drm_dp_mst_dump_topology(struct seq_file *m,

			      struct drm_dp_mst_topology_mgr *mgr);

void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr);

int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr);

#endif