include/linux/usb_bam.h

/* Copyright (c) 2011-2014, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#ifndef _USB_BAM_H_
#define _USB_BAM_H_
#include <linux/msm-sps.h>
#include <linux/ipa.h>
#include <linux/usb/msm_hsusb.h>

#define MAX_BAMS	NUM_CTRL	/* Bam per USB controllers */


enum usb_bam_mode {
	USB_BAM_DEVICE = 0,
	USB_BAM_HOST,
};

enum peer_bam {
	A2_P_BAM = 0,
	QDSS_P_BAM,
	IPA_P_BAM,
	MAX_PEER_BAMS,
};

enum usb_bam_pipe_dir {
	USB_TO_PEER_PERIPHERAL,
	PEER_PERIPHERAL_TO_USB,
};

enum usb_pipe_mem_type {
	SPS_PIPE_MEM = 0,	/* Default, SPS dedicated pipe memory */
	USB_PRIVATE_MEM,	/* USB's private memory */
	SYSTEM_MEM,		/* System RAM, requires allocation */
	OCI_MEM,		/* Shared memory among peripherals */
};

enum usb_bam_event_type {
	USB_BAM_EVENT_WAKEUP_PIPE = 0,	/* Wake a pipe */
	USB_BAM_EVENT_WAKEUP,		/* Wake a bam (first pipe waked) */
	USB_BAM_EVENT_INACTIVITY,	/* Inactivity on all pipes */
};

enum usb_bam_pipe_type {
	USB_BAM_PIPE_BAM2BAM = 0,	/* Connection is BAM2BAM (default) */
	USB_BAM_PIPE_SYS2BAM,		/* Connection is SYS2BAM or BAM2SYS
					 * depending on usb_bam_pipe_dir
					 */
	USB_BAM_MAX_PIPE_TYPES,
};

/**
* struct usb_bam_connect_ipa_params: Connect Bam pipe to IPA peer infromation.
* @ src_idx: Source pipe index in usb bam pipes lists.
* @ dst_idx: Destination pipe index in usb bam pipes lists.
* @ src_pipe: The source pipe index in the sps level.
* @ dst_pipe: The destination pipe index in the sps level.
* @ keep_ipa_awake: When true, IPA will not be clock gated.
* @ ipa_cons_ep_idx: The pipe index on the IPA peer bam side, consumer.
* @ ipa_prod_ep_idx: The pipe index on the IPA peer bam side, producer.
* @ prod_clnt_hdl: Producer client handle returned by IPA driver
* @ cons_clnt_hdl: Consumer client handle returned by IPA driver
* @ src_client: Source IPA client type.
* @ dst_client: Destination IPA client type.
* @ ipa_ep_cfg: Configuration of IPA end-point (see struct ipa_ep_cfg)
* @priv: Callback cookie to the notify event.
* @notify: Callback on data path event by IPA (see enum ipa_dp_evt_type)
*	 This call back gets back the priv cookie.
*	 for Bam2Bam mode, this callback is in the tethering bridge.
* @ activity_notify: Callback to be notified on and data being pushed into the
*		 USB consumer pipe.
* @ inactivity_notify: Callback to be notified on inactivity of all the current
*		   open pipes between the USB bam and its peer.
* @ skip_ep_cfg: boolean field that determines if Apps-processor
*	            should or should not confiugre this end-point.
*	            (Please see struct teth_bridge_init_params)
* @ reset_pipe_after_lpm: bool to indicate if IPA should reset pipe after LPM.
* @ usb_connection_speed: The actual speed the USB core currently works at.
*/
struct usb_bam_connect_ipa_params {
	u8 src_idx;
	u8 dst_idx;
	u32 *src_pipe;
	u32 *dst_pipe;
	bool keep_ipa_awake;
	enum usb_bam_pipe_dir dir;
	/* Parameters for Port Mapper */
	u32 ipa_cons_ep_idx;
	u32 ipa_prod_ep_idx;
	/* client handle assigned by IPA to client */
	u32 prod_clnt_hdl;
	u32 cons_clnt_hdl;
	/* params assigned by the CD */
	enum ipa_client_type src_client;
	enum ipa_client_type dst_client;
	struct ipa_ep_cfg ipa_ep_cfg;
	void *priv;
	void (*notify)(void *priv, enum ipa_dp_evt_type evt,
			unsigned long data);
	int (*activity_notify)(void *priv);
	int (*inactivity_notify)(void *priv);
	bool skip_ep_cfg;
	bool reset_pipe_after_lpm;
	enum usb_device_speed usb_connection_speed;
};

/**
* struct usb_bam_event_info: suspend/resume event information.
* @type: usb bam event type.
* @event: holds event data.
* @callback: suspend/resume callback.
* @param: port num (for suspend) or NULL (for resume).
* @event_w: holds work queue parameters.
*/
struct usb_bam_event_info {
	enum usb_bam_event_type type;
	struct sps_register_event event;
	int (*callback)(void *);
	void *param;
	struct work_struct event_w;
};

/**
* struct usb_bam_pipe_connect: pipe connection information
* between USB/HSIC BAM and another BAM. USB/HSIC BAM can be
* either src BAM or dst BAM
* @name: pipe description.
* @mem_type: type of memory used for BAM FIFOs
* @src_phy_addr: src bam physical address.
* @src_pipe_index: src bam pipe index.
* @dst_phy_addr: dst bam physical address.
* @dst_pipe_index: dst bam pipe index.
* @data_fifo_base_offset: data fifo offset.
* @data_fifo_size: data fifo size.
* @desc_fifo_base_offset: descriptor fifo offset.
* @desc_fifo_size: descriptor fifo size.
* @data_mem_buf: data fifo buffer.
* @desc_mem_buf: descriptor fifo buffer.
* @event: event for wakeup.
* @enabled: true if pipe is enabled.
* @suspended: true if pipe is suspended.
* @cons_stopped: true is pipe has consumer requests stopped.
* @prod_stopped: true if pipe has producer requests stopped.
* @ipa_clnt_hdl : pipe handle to ipa api.
* @priv: private data to return upon activity_notify
*	or inactivity_notify callbacks.
* @activity_notify: callback to invoke on activity on one of the in pipes.
* @inactivity_notify: callback to invoke on inactivity on all pipes.
* @start: callback to invoke to enqueue transfers on a pipe.
* @stop: callback to invoke on dequeue transfers on a pipe.
* @start_stop_param: param for the start/stop callbacks.
*/
struct usb_bam_pipe_connect {
	const char *name;
	u32 pipe_num;
	enum usb_pipe_mem_type mem_type;
	enum usb_bam_pipe_dir dir;
	enum usb_ctrl bam_type;
	enum usb_bam_mode bam_mode;
	enum peer_bam peer_bam;
	enum usb_bam_pipe_type pipe_type;
	u32 src_phy_addr;
	u32 src_pipe_index;
	u32 dst_phy_addr;
	u32 dst_pipe_index;
	u32 data_fifo_base_offset;
	u32 data_fifo_size;
	u32 desc_fifo_base_offset;
	u32 desc_fifo_size;
	struct sps_mem_buffer data_mem_buf;
	struct sps_mem_buffer desc_mem_buf;
	struct usb_bam_event_info event;
	bool enabled;
	bool suspended;
	bool cons_stopped;
	bool prod_stopped;
	int ipa_clnt_hdl;
	void *priv;
	int (*activity_notify)(void *priv);
	int (*inactivity_notify)(void *priv);
	void (*start)(void *, enum usb_bam_pipe_dir);
	void (*stop)(void *, enum usb_bam_pipe_dir);
	void *start_stop_param;
	bool reset_pipe_after_lpm;
};

/**
 * struct msm_usb_bam_platform_data: pipe connection information
 * between USB/HSIC BAM and another BAM. USB/HSIC BAM can be
 * either src BAM or dst BAM
 * @connections: holds all pipe connections data.
 * @usb_bam_num_pipes: max number of pipes to use.
 * @active_conn_num: number of active pipe connections.
 * @usb_bam_fifo_baseaddr: base address for bam pipe's data and descriptor
 *                         fifos. This can be on chip memory (ocimem) or usb
 *                         private memory.
 * @ignore_core_reset_ack: BAM can ignore ACK from USB core during PIPE RESET
 * @disable_clk_gating: Disable clock gating
 * @override_threshold: Override the default threshold value for Read/Write
 *                         event generation by the BAM towards another BAM.
 * @max_mbps_highspeed: Maximum Mbits per seconds that the USB core
 *		can work at in bam2bam mode when connected to HS host.
 * @max_mbps_superspeed: Maximum Mbits per seconds that the USB core
 *		can work at in bam2bam mode when connected to SS host.
 */
struct msm_usb_bam_platform_data {
	struct usb_bam_pipe_connect *connections;
	u8 max_connections;
	int usb_bam_num_pipes;
	phys_addr_t usb_bam_fifo_baseaddr;
	bool ignore_core_reset_ack;
	bool reset_on_connect[MAX_BAMS];
	bool disable_clk_gating;
	u32 override_threshold;
	u32 max_mbps_highspeed;
	u32 max_mbps_superspeed;
};

#ifdef CONFIG_USB_BAM
/**
 * Connect USB-to-Peripheral SPS connection.
 *
 * This function returns the allocated pipe number.
 *
 * @idx - Connection index.
 *
 * @bam_pipe_idx - allocated pipe index.
 *
 * @return 0 on success, negative value on error
 *
 */
int usb_bam_connect(int idx, u32 *bam_pipe_idx);

/**
 * Connect USB-to-IPA SPS connection.
 *
 * This function returns the allocated pipes number and clnt
 * handles. Assumes that the user first connects producer pipes
 * and only after that consumer pipes, since that's the correct
 * sequence for the handshake with the IPA.
 *
 * @ipa_params - in/out parameters
 *
 * @return 0 on success, negative value on error
 *
 */
int usb_bam_connect_ipa(struct usb_bam_connect_ipa_params *ipa_params);

/**
 * Disconnect USB-to-IPA SPS connection.
 *
 * @ipa_params - in/out parameters
 *
 * @return 0 on success, negative value on error
 *
 */
int usb_bam_disconnect_ipa(
		struct usb_bam_connect_ipa_params *ipa_params);

/**
 * Register a wakeup callback from peer BAM.
 *
 * @idx - Connection index.
 *
 * @callback - the callback function
 *
 * @return 0 on success, negative value on error
 *
 */
int usb_bam_register_wake_cb(u8 idx,
	int (*callback)(void *), void *param);

/**
 * Register a callback for peer BAM reset.
 *
 * @callback - the callback function that will be called in USB
 *				driver upon a peer bam reset
 *
 * @param - context that the caller can supply
 *
 * @return 0 on success, negative value on error
 *
 */
int usb_bam_register_peer_reset_cb(int (*callback)(void *), void *param);

/**
 * Register callbacks for start/stop of transfers.
 *
 * @idx - Connection index
 *
 * @start - the callback function that will be called in USB
 *				driver to start transfers
 * @stop - the callback function that will be called in USB
 *				driver to stop transfers
 *
 * @param - context that the caller can supply
 *
 * @return 0 on success, negative value on error
 *
 */
int usb_bam_register_start_stop_cbs(
	u8 idx,
	void (*start)(void *, enum usb_bam_pipe_dir),
	void (*stop)(void *, enum usb_bam_pipe_dir),
	void *param);

/**
 * Start usb suspend sequence
 *
 * @ipa_params -  in/out parameters
 *
 */
void usb_bam_suspend(struct usb_bam_connect_ipa_params *ipa_params);

/**
 * Start usb resume sequence
 *
 * @ipa_params -  in/out parameters
 *
 */
void usb_bam_resume(struct usb_bam_connect_ipa_params *ipa_params);
/**
 * Disconnect USB-to-Periperal SPS connection.
 *
 * @idx - Connection index.
 *
 * @return 0 on success, negative value on error
 */
int usb_bam_disconnect_pipe(u8 idx);

/**
 * Returns usb bam connection parameters.
 *
 * @idx - Connection index.
 *
 * @usb_bam_handle - Usb bam handle.
 *
 * @usb_bam_pipe_idx - Usb bam pipe index.
 *
 * @peer_pipe_idx - Peer pipe index.
 *
 * @desc_fifo - Descriptor fifo parameters.
 *
 * @data_fifo - Data fifo parameters.
 *
 * @return pipe index on success, negative value on error.
 */
int get_bam2bam_connection_info(u8 idx,
	unsigned long *usb_bam_handle, u32 *usb_bam_pipe_idx,
	u32 *peer_pipe_idx, struct sps_mem_buffer *desc_fifo,
	struct sps_mem_buffer *data_fifo, enum usb_pipe_mem_type *mem_type);

/**
 * Resets the USB BAM that has A2 pipes
 *
 */
int usb_bam_a2_reset(bool to_reconnect);

/**
 * Indicates if the client of the USB BAM is ready to start
 * sending/receiving transfers.
 *
 * @ready - TRUE to enable, FALSE to disable.
 *
 */
int usb_bam_client_ready(bool ready);

/**
* Returns upon reset completion if reset is in progress
* immediately otherwise.
*
*/
void usb_bam_reset_complete(void);

/**
* Returns qdss index from the connections array.
*
* @num - The qdss pipe number.
*
* @return pipe index on success, negative value on error
*/
int usb_bam_get_qdss_idx(u8 num);

/**
* Saves qdss core number.
*
* @qdss_core - The qdss core name.
*/
void usb_bam_set_qdss_core(const char *qdss_core);

/**
* Indicates if the client of the USB BAM is ready to start
* sending/receiving transfers.
*
* @name - Core name (ssusb/hsusb/hsic).
*
* @client - Usb pipe peer (a2, ipa, qdss...)
*
* @dir - In (from peer to usb) or out (from usb to peer)
*
* @num - Pipe number.
*
* @return 0 on success, negative value on error
*/
int usb_bam_get_connection_idx(const char *name, enum peer_bam client,
	enum usb_bam_pipe_dir dir, enum usb_bam_mode bam_mode, u32 num);

/**
* return the usb controller bam type used for the supplied connection index
*
* @connection_idx - Connection index
*
* @return usb control bam type
*/
int usb_bam_get_bam_type(int connection_idx);

/**
* Indicates the type of connection the USB side of the connection is.
*
* @idx - Pipe number.
*
* @type - Type of connection
*
* @return 0 on success, negative value on error
*/
int usb_bam_get_pipe_type(u8 idx, enum usb_bam_pipe_type *type);

/**
* Indicates whether USB producer is granted to IPA resource manager.
*
* @return true when producer granted, false when prodcuer is released.
*/
bool usb_bam_get_prod_granted(u8 idx);

#else
static inline int usb_bam_connect(u8 idx, u32 *bam_pipe_idx)
{
	return -ENODEV;
}

static inline int usb_bam_connect_ipa(
			struct usb_bam_connect_ipa_params *ipa_params)
{
	return -ENODEV;
}

static inline int usb_bam_disconnect_ipa(
			struct usb_bam_connect_ipa_params *ipa_params)
{
	return -ENODEV;
}

static inline void usb_bam_wait_for_cons_granted(
			struct usb_bam_connect_ipa_params *ipa_params)
{
	return;
}

static inline int usb_bam_register_wake_cb(u8 idx,
	int (*callback)(void *), void* param)
{
	return -ENODEV;
}

static inline int usb_bam_register_peer_reset_cb(
	int (*callback)(void *), void *param)
{
	return -ENODEV;
}

static inline int usb_bam_register_start_stop_cbs(
	u8 idx,
	void (*start)(void *, enum usb_bam_pipe_dir),
	void (*stop)(void *, enum usb_bam_pipe_dir),
	void *param)
{
	return -ENODEV;
}

static inline void usb_bam_suspend(
	struct usb_bam_connect_ipa_params *ipa_params){}

static inline void usb_bam_resume(
	struct usb_bam_connect_ipa_params *ipa_params) {}

static inline int usb_bam_disconnect_pipe(u8 idx)
{
	return -ENODEV;
}

static inline int get_bam2bam_connection_info(u8 idx,
	unsigned long *usb_bam_handle, u32 *usb_bam_pipe_idx,
	u32 *peer_pipe_idx, struct sps_mem_buffer *desc_fifo,
	struct sps_mem_buffer *data_fifo, enum usb_pipe_mem_type *mem_type)
{
	return -ENODEV;
}

static inline int usb_bam_a2_reset(bool to_reconnect)
{
	return -ENODEV;
}

static inline int usb_bam_client_ready(bool ready)
{
	return -ENODEV;
}

static inline void usb_bam_reset_complete(void)
{
	return;
}

static inline int usb_bam_get_qdss_idx(u8 num)
{
	return -ENODEV;
}

static inline void usb_bam_set_qdss_core(const char *qdss_core)
{
	return;
}

static inline int usb_bam_get_connection_idx(const char *name,
		enum peer_bam client, enum usb_bam_pipe_dir dir,
		enum usb_bam_mode bam_mode, u32 num)
{
	return -ENODEV;
}

static inline int usb_bam_get_bam_type(int connection_idx)
{
	return -ENODEV;
}

static inline int usb_bam_get_pipe_type(u8 idx, enum usb_bam_pipe_type *type)
{
	return -ENODEV;
}

static inline bool usb_bam_get_prod_granted(u8 idx)
{
	return false;
}

#endif
#endif				/* _USB_BAM_H_ */