/*
 * Copyright (c) 2005-2011 Atheros Communications Inc.
 * Copyright (c) 2011-2013 Qualcomm Atheros, Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, 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 _HIF_H_
#define _HIF_H_

#include <linux/kernel.h>
#include "core.h"
#include "debug.h"

struct ath10k_hif_sg_item {
        u16 transfer_id;
        void *transfer_context; /* NULL = tx completion callback not called */
        void *vaddr; /* for debugging mostly */
        u32 paddr;
        u16 len;
};

struct ath10k_hif_cb {
        int (*tx_completion)(struct ath10k *ar,
                             struct sk_buff *wbuf);
        int (*rx_completion)(struct ath10k *ar,
                             struct sk_buff *wbuf);
};

struct ath10k_hif_ops {
        /* send a scatter-gather list to the target */
        int (*tx_sg)(struct ath10k *ar, u8 pipe_id,
                     struct ath10k_hif_sg_item *items, int n_items);

        /* read firmware memory through the diagnose interface */
        int (*diag_read)(struct ath10k *ar, u32 address, void *buf,
                         size_t buf_len);

        int (*diag_write)(struct ath10k *ar, u32 address, const void *data,
                          int nbytes);
        /*
         * API to handle HIF-specific BMI message exchanges, this API is
         * synchronous and only allowed to be called from a context that
         * can block (sleep)
         */
        int (*exchange_bmi_msg)(struct ath10k *ar,
                                void *request, u32 request_len,
                                void *response, u32 *response_len);

        /* Post BMI phase, after FW is loaded. Starts regular operation */
        int (*start)(struct ath10k *ar);

        /* Clean up what start() did. This does not revert to BMI phase. If
         * desired so, call power_down() and power_up() */
        void (*stop)(struct ath10k *ar);

        int (*map_service_to_pipe)(struct ath10k *ar, u16 service_id,
                                   u8 *ul_pipe, u8 *dl_pipe,
                                   int *ul_is_polled, int *dl_is_polled);

        void (*get_default_pipe)(struct ath10k *ar, u8 *ul_pipe, u8 *dl_pipe);

        /*
         * Check if prior sends have completed.
         *
         * Check whether the pipe in question has any completed
         * sends that have not yet been processed.
         * This function is only relevant for HIF pipes that are configured
         * to be polled rather than interrupt-driven.
         */
        void (*send_complete_check)(struct ath10k *ar, u8 pipe_id, int force);

        void (*set_callbacks)(struct ath10k *ar,
                              struct ath10k_hif_cb *callbacks);

        u16 (*get_free_queue_number)(struct ath10k *ar, u8 pipe_id);

        u32 (*read32)(struct ath10k *ar, u32 address);

        void (*write32)(struct ath10k *ar, u32 address, u32 value);

        /* Power up the device and enter BMI transfer mode for FW download */
        int (*power_up)(struct ath10k *ar);

        /* Power down the device and free up resources. stop() must be called
         * before this if start() was called earlier */
        void (*power_down)(struct ath10k *ar);

        int (*suspend)(struct ath10k *ar);
        int (*resume)(struct ath10k *ar);
};

static inline int ath10k_hif_tx_sg(struct ath10k *ar, u8 pipe_id,
                                   struct ath10k_hif_sg_item *items,
                                   int n_items)
{
        return ar->hif.ops->tx_sg(ar, pipe_id, items, n_items);
}

static inline int ath10k_hif_diag_read(struct ath10k *ar, u32 address, void *buf,
                                       size_t buf_len)
{
        return ar->hif.ops->diag_read(ar, address, buf, buf_len);
}

static inline int ath10k_hif_diag_write(struct ath10k *ar, u32 address,
                                        const void *data, int nbytes)
{
        if (!ar->hif.ops->diag_write)
                return -EOPNOTSUPP;

        return ar->hif.ops->diag_write(ar, address, data, nbytes);
}

static inline int ath10k_hif_exchange_bmi_msg(struct ath10k *ar,
                                              void *request, u32 request_len,
                                              void *response, u32 *response_len)
{
        return ar->hif.ops->exchange_bmi_msg(ar, request, request_len,
                                             response, response_len);
}

static inline int ath10k_hif_start(struct ath10k *ar)
{
        return ar->hif.ops->start(ar);
}

static inline void ath10k_hif_stop(struct ath10k *ar)
{
        return ar->hif.ops->stop(ar);
}

static inline int ath10k_hif_map_service_to_pipe(struct ath10k *ar,
                                                 u16 service_id,
                                                 u8 *ul_pipe, u8 *dl_pipe,
                                                 int *ul_is_polled,
                                                 int *dl_is_polled)
{
        return ar->hif.ops->map_service_to_pipe(ar, service_id,
                                                ul_pipe, dl_pipe,
                                                ul_is_polled, dl_is_polled);
}

static inline void ath10k_hif_get_default_pipe(struct ath10k *ar,
                                               u8 *ul_pipe, u8 *dl_pipe)
{
        ar->hif.ops->get_default_pipe(ar, ul_pipe, dl_pipe);
}

static inline void ath10k_hif_send_complete_check(struct ath10k *ar,
                                                  u8 pipe_id, int force)
{
        ar->hif.ops->send_complete_check(ar, pipe_id, force);
}

static inline void ath10k_hif_set_callbacks(struct ath10k *ar,
                                            struct ath10k_hif_cb *callbacks)
{
        ar->hif.ops->set_callbacks(ar, callbacks);
}

static inline u16 ath10k_hif_get_free_queue_number(struct ath10k *ar,
                                                   u8 pipe_id)
{
        return ar->hif.ops->get_free_queue_number(ar, pipe_id);
}

static inline int ath10k_hif_power_up(struct ath10k *ar)
{
        return ar->hif.ops->power_up(ar);
}

static inline void ath10k_hif_power_down(struct ath10k *ar)
{
        ar->hif.ops->power_down(ar);
}

static inline int ath10k_hif_suspend(struct ath10k *ar)
{
        if (!ar->hif.ops->suspend)
                return -EOPNOTSUPP;

        return ar->hif.ops->suspend(ar);
}

static inline int ath10k_hif_resume(struct ath10k *ar)
{
        if (!ar->hif.ops->resume)
                return -EOPNOTSUPP;

        return ar->hif.ops->resume(ar);
}

static inline u32 ath10k_hif_read32(struct ath10k *ar, u32 address)
{
        if (!ar->hif.ops->read32) {
                ath10k_warn(ar, "hif read32 not supported\n");
                return 0xdeaddead;
        }

        return ar->hif.ops->read32(ar, address);
}

static inline void ath10k_hif_write32(struct ath10k *ar,
                                      u32 address, u32 data)
{
        if (!ar->hif.ops->write32) {
                ath10k_warn(ar, "hif write32 not supported\n");
                return;
        }

        ar->hif.ops->write32(ar, address, data);
}

#endif /* _HIF_H_ */