/* Copyright (c) 2012-2016, 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 _IPA_USB_H_
#define _IPA_USB_H_

enum ipa_usb_teth_prot {
	IPA_USB_RNDIS = 0,
	IPA_USB_ECM = 1,
	IPA_USB_RMNET = 2,
	IPA_USB_MBIM = 3,
	IPA_USB_DIAG = 4,
	IPA_USB_MAX_TETH_PROT_SIZE
};

/**
 * ipa_usb_teth_params - parameters for RDNIS/ECM initialization API
 *
 * @host_ethaddr:        host Ethernet address in network order
 * @device_ethaddr:      device Ethernet address in network order
 */
struct ipa_usb_teth_params {
	u8 host_ethaddr[ETH_ALEN];
	u8 device_ethaddr[ETH_ALEN];
};

enum ipa_usb_notify_event {
	IPA_USB_DEVICE_READY,
	IPA_USB_REMOTE_WAKEUP,
	IPA_USB_SUSPEND_COMPLETED
};

enum ipa_usb_max_usb_packet_size {
	IPA_USB_HIGH_SPEED_512B = 512,
	IPA_USB_SUPER_SPEED_1024B = 1024
};

/**
 * ipa_usb_teth_prot_params - parameters for connecting RNDIS
 *
 * @max_xfer_size_bytes_to_dev:   max size of UL packets in bytes
 * @max_packet_number_to_dev:     max number of UL aggregated packets
 * @max_xfer_size_bytes_to_host:  max size of DL packets in bytes
 *
 */
struct ipa_usb_teth_prot_params {
	u32 max_xfer_size_bytes_to_dev;
	u32 max_packet_number_to_dev;
	u32 max_xfer_size_bytes_to_host;
};

/**
 * ipa_usb_xdci_connect_params - parameters required to start IN, OUT
 * channels, and connect RNDIS/ECM/teth_bridge
 *
 * @max_pkt_size:          high speed or full speed
 * @ipa_to_usb_xferrscidx: Transfer Resource Index (XferRscIdx) for IN channel.
 *                         The hardware-assigned transfer resource index for the
 *                         transfer, which was returned in response to the
 *                         Start Transfer command. This field is used for
 *                         "Update Transfer" command.
 *                         Should be 0 =< ipa_to_usb_xferrscidx <= 127.
 * @ipa_to_usb_xferrscidx_valid: true if xferRscIdx should be updated for IN
 *                         channel
 * @usb_to_ipa_xferrscidx: Transfer Resource Index (XferRscIdx) for OUT channel
 *                         Should be 0 =< usb_to_ipa_xferrscidx <= 127.
 * @usb_to_ipa_xferrscidx_valid: true if xferRscIdx should be updated for OUT
 *                         channel
 * @teth_prot:             tethering protocol
 * @teth_prot_params:      parameters for connecting the tethering protocol.
 * @max_supported_bandwidth_mbps: maximum bandwidth need of the client in Mbps
 */
struct ipa_usb_xdci_connect_params {
	enum ipa_usb_max_usb_packet_size max_pkt_size;
	u8 ipa_to_usb_xferrscidx;
	bool ipa_to_usb_xferrscidx_valid;
	u8 usb_to_ipa_xferrscidx;
	bool usb_to_ipa_xferrscidx_valid;
	enum ipa_usb_teth_prot teth_prot;
	struct ipa_usb_teth_prot_params teth_prot_params;
	u32 max_supported_bandwidth_mbps;
};

/**
 * ipa_usb_xdci_chan_scratch - xDCI protocol SW config area of
 * channel scratch
 *
 * @last_trb_addr_iova:  Address (iova LSB - based on alignment restrictions) of
 *                       last TRB in queue. Used to identify roll over case
 * @const_buffer_size:   TRB buffer size in KB (similar to IPA aggregation
 *                       configuration). Must be aligned to max USB Packet Size.
 *                       Should be 1 <= const_buffer_size <= 31.
 * @depcmd_low_addr:     Used to generate "Update Transfer" command
 * @depcmd_hi_addr:      Used to generate "Update Transfer" command.
 */
struct ipa_usb_xdci_chan_scratch {
	u16 last_trb_addr_iova;
	u8 const_buffer_size;
	u32 depcmd_low_addr;
	u8 depcmd_hi_addr;
};

/**
 * ipa_usb_xdci_chan_params - xDCI channel related properties
 *
 * @client:              type of "client"
 * @ipa_ep_cfg:          IPA EP configuration
 * @keep_ipa_awake:      when true, IPA will not be clock gated
 * @teth_prot:           tethering protocol for which the channel is created
 * @gevntcount_low_addr: GEVNCOUNT low address for event scratch
 * @gevntcount_hi_addr:  GEVNCOUNT high address for event scratch
 * @dir:                 channel direction
 * @xfer_ring_len:       length of transfer ring in bytes (must be integral
 *                       multiple of transfer element size - 16B for xDCI)
 * @xfer_ring_base_addr: physical base address of transfer ring. Address must be
 *                       aligned to xfer_ring_len rounded to power of two
 * @xfer_scratch:        parameters for xDCI channel scratch
 * @xfer_ring_base_addr_iova: IO virtual address mapped to xfer_ring_base_addr
 * @data_buff_base_len:  length of data buffer allocated by USB driver
 * @data_buff_base_addr: physical base address for the data buffer (where TRBs
 *                       points)
 * @data_buff_base_addr_iova:  IO virtual address mapped to data_buff_base_addr
 *
 */
struct ipa_usb_xdci_chan_params {
	/* IPA EP params */
	enum ipa_client_type client;
	struct ipa_ep_cfg ipa_ep_cfg;
	bool keep_ipa_awake;
	enum ipa_usb_teth_prot teth_prot;
	/* event ring params */
	u32 gevntcount_low_addr;
	u8 gevntcount_hi_addr;
	/* transfer ring params */
	enum gsi_chan_dir dir;
	u16 xfer_ring_len;
	u64 xfer_ring_base_addr;
	struct ipa_usb_xdci_chan_scratch xfer_scratch;
	u64 xfer_ring_base_addr_iova;
	u32 data_buff_base_len;
	u64 data_buff_base_addr;
	u64 data_buff_base_addr_iova;
};

/**
 * ipa_usb_chan_out_params - out parameters for channel request
 *
 * @clnt_hdl:            opaque client handle assigned by IPA to client
 * @db_reg_phs_addr_lsb: Physical address of doorbell register where the 32
 *                       LSBs of the doorbell value should be written
 * @db_reg_phs_addr_msb: Physical address of doorbell register where the 32
 *                       MSBs of the doorbell value should be written
 *
 */
struct ipa_req_chan_out_params {
	u32 clnt_hdl;
	u32 db_reg_phs_addr_lsb;
	u32 db_reg_phs_addr_msb;
};

#ifdef CONFIG_IPA3

/**
 * ipa_usb_init_teth_prot - Peripheral should call this function to initialize
 * RNDIS/ECM/teth_bridge/DPL, prior to calling ipa_usb_xdci_connect()
 *
 * @usb_teth_type: tethering protocol type
 * @teth_params:   pointer to tethering protocol parameters.
 *                 Should be struct ipa_usb_teth_params for RNDIS/ECM,
 *                 or NULL for teth_bridge
 * @ipa_usb_notify_cb: will be called to notify USB driver on certain events
 * @user_data:     cookie used for ipa_usb_notify_cb
 *
 * @Return 0 on success, negative on failure
 */
int ipa_usb_init_teth_prot(enum ipa_usb_teth_prot teth_prot,
			   struct ipa_usb_teth_params *teth_params,
			   int (*ipa_usb_notify_cb)(enum ipa_usb_notify_event,
			   void *),
			   void *user_data);

/**
 * ipa_usb_xdci_connect - Peripheral should call this function to start IN &
 * OUT xDCI channels, and connect RNDIS/ECM/MBIM/RMNET.
 * For DPL, only starts IN channel.
 *
 * @ul_chan_params: parameters for allocating UL xDCI channel. containing
 *              required info on event and transfer rings, and IPA EP
 *              configuration
 * @ul_out_params: [out] opaque client handle assigned by IPA to client & DB
 *              registers physical address for UL channel
 * @dl_chan_params: parameters for allocating DL xDCI channel. containing
 *              required info on event and transfer rings, and IPA EP
 *              configuration
 * @dl_out_params: [out] opaque client handle assigned by IPA to client & DB
 *              registers physical address for DL channel
 * @connect_params: handles and scratch params of the required channels,
 *              tethering protocol and the tethering protocol parameters.
 *
 * Note: Should not be called from atomic context
 *
 * @Return 0 on success, negative on failure
 */
int ipa_usb_xdci_connect(struct ipa_usb_xdci_chan_params *ul_chan_params,
			 struct ipa_usb_xdci_chan_params *dl_chan_params,
			 struct ipa_req_chan_out_params *ul_out_params,
			 struct ipa_req_chan_out_params *dl_out_params,
			 struct ipa_usb_xdci_connect_params *connect_params);

/**
 * ipa_usb_xdci_disconnect - Peripheral should call this function to stop
 * IN & OUT xDCI channels
 * For DPL, only stops IN channel.
 *
 * @ul_clnt_hdl:    client handle received from ipa_usb_xdci_connect()
 *                  for OUT channel
 * @dl_clnt_hdl:    client handle received from ipa_usb_xdci_connect()
 *                  for IN channel
 * @teth_prot:      tethering protocol
 *
 * Note: Should not be called from atomic context
 *
 * @Return 0 on success, negative on failure
 */
int ipa_usb_xdci_disconnect(u32 ul_clnt_hdl, u32 dl_clnt_hdl,
			    enum ipa_usb_teth_prot teth_prot);

/**
 * ipa_usb_deinit_teth_prot - Peripheral should call this function to deinit
 * RNDIS/ECM/MBIM/RMNET
 *
 * @teth_prot: tethering protocol
 *
 * @Return 0 on success, negative on failure
 */
int ipa_usb_deinit_teth_prot(enum ipa_usb_teth_prot teth_prot);

/**
 * ipa_usb_xdci_suspend - Peripheral should call this function to suspend
 * IN & OUT or DPL xDCI channels
 *
 * @ul_clnt_hdl: client handle previously obtained from
 *               ipa_usb_xdci_connect() for OUT channel
 * @dl_clnt_hdl: client handle previously obtained from
 *               ipa_usb_xdci_connect() for IN channel
 * @teth_prot:   tethering protocol
 *
 * Note: Should not be called from atomic context
 * Note: for DPL, the ul will be ignored as irrelevant
 *
 * @Return 0 on success, negative on failure
 */
int ipa_usb_xdci_suspend(u32 ul_clnt_hdl, u32 dl_clnt_hdl,
			 enum ipa_usb_teth_prot teth_prot);

/**
 * ipa_usb_xdci_resume - Peripheral should call this function to resume
 * IN & OUT or DPL xDCI channels
 *
 * @ul_clnt_hdl:   client handle received from ipa_usb_xdci_connect()
 *                 for OUT channel
 * @dl_clnt_hdl:   client handle received from ipa_usb_xdci_connect()
 *                 for IN channel
 * @teth_prot:   tethering protocol
 *
 * Note: Should not be called from atomic context
 * Note: for DPL, the ul will be ignored as irrelevant
 *
 * @Return 0 on success, negative on failure
 */
int ipa_usb_xdci_resume(u32 ul_clnt_hdl, u32 dl_clnt_hdl,
			enum ipa_usb_teth_prot teth_prot);

#else /* CONFIG_IPA3 */

static inline int ipa_usb_init_teth_prot(enum ipa_usb_teth_prot teth_prot,
			   struct ipa_usb_teth_params *teth_params,
			   int (*ipa_usb_notify_cb)(enum ipa_usb_notify_event,
			   void *),
			   void *user_data)
{
	return -EPERM;
}

static inline int ipa_usb_xdci_connect(
			 struct ipa_usb_xdci_chan_params *ul_chan_params,
			 struct ipa_usb_xdci_chan_params *dl_chan_params,
			 struct ipa_req_chan_out_params *ul_out_params,
			 struct ipa_req_chan_out_params *dl_out_params,
			 struct ipa_usb_xdci_connect_params *connect_params)
{
	return -EPERM;
}

static inline int ipa_usb_xdci_disconnect(u32 ul_clnt_hdl, u32 dl_clnt_hdl,
			    enum ipa_usb_teth_prot teth_prot)
{
	return -EPERM;
}

static inline int ipa_usb_deinit_teth_prot(enum ipa_usb_teth_prot teth_prot)
{
	return -EPERM;
}

static inline int ipa_usb_xdci_suspend(u32 ul_clnt_hdl, u32 dl_clnt_hdl,
			 enum ipa_usb_teth_prot teth_prot)
{
	return -EPERM;
}

static inline int ipa_usb_xdci_resume(u32 ul_clnt_hdl, u32 dl_clnt_hdl,
			enum ipa_usb_teth_prot teth_prot)
{
	return -EPERM;
}


#endif /* CONFIG_IPA3 */

#endif /* _IPA_USB_H_ */