/******************************************************************************
 * rtl871x_io.c
 *
 * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
 * Linux device driver for RTL8192SU
 *
 * 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
 * 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.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
 *
 * Modifications for inclusion into the Linux staging tree are
 * Copyright(c) 2010 Larry Finger. All rights reserved.
 *
 * Contact information:
 * WLAN FAE <wlanfae@realtek.com>
 * Larry Finger <Larry.Finger@lwfinger.net>
 *
 ******************************************************************************/
/*
 *
 * The purpose of rtl871x_io.c
 *
 * a. provides the API
 * b. provides the protocol engine
 * c. provides the software interface between caller and the hardware interface
 *
 * For r8712u, both sync/async operations are provided.
 *
 * Only sync read/write_mem operations are provided.
 *
 */

#define _RTL871X_IO_C_

#include "osdep_service.h"
#include "drv_types.h"
#include "rtl871x_io.h"
#include "osdep_intf.h"
#include "usb_ops.h"

static uint _init_intf_hdl(struct _adapter *padapter,
                           struct intf_hdl *pintf_hdl)
{
        struct  intf_priv       *pintf_priv;
        void (*set_intf_option)(u32 *poption) = NULL;
        void (*set_intf_funs)(struct intf_hdl *pintf_hdl);
        void (*set_intf_ops)(struct _io_ops     *pops);
        uint (*init_intf_priv)(struct intf_priv *pintfpriv);

        set_intf_option = &(r8712_usb_set_intf_option);
        set_intf_funs = &(r8712_usb_set_intf_funs);
        set_intf_ops = &r8712_usb_set_intf_ops;
        init_intf_priv = &r8712_usb_init_intf_priv;
        pintf_priv = pintf_hdl->pintfpriv = (struct intf_priv *)
                     _malloc(sizeof(struct intf_priv));
        if (pintf_priv == NULL)
                goto _init_intf_hdl_fail;
        pintf_hdl->adapter = (u8 *)padapter;
        set_intf_option(&pintf_hdl->intf_option);
        set_intf_funs(pintf_hdl);
        set_intf_ops(&pintf_hdl->io_ops);
        pintf_priv->intf_dev = (u8 *)&(padapter->dvobjpriv);
        if (init_intf_priv(pintf_priv) == _FAIL)
                goto _init_intf_hdl_fail;
        return _SUCCESS;
_init_intf_hdl_fail:
        kfree(pintf_priv);
        return _FAIL;
}

static void _unload_intf_hdl(struct intf_priv *pintfpriv)
{
        void (*unload_intf_priv)(struct intf_priv *pintfpriv);

        unload_intf_priv = &r8712_usb_unload_intf_priv;
        unload_intf_priv(pintfpriv);
        kfree(pintfpriv);
}

static uint register_intf_hdl(u8 *dev, struct intf_hdl *pintfhdl)
{
        struct _adapter *adapter = (struct _adapter *)dev;

        pintfhdl->intf_option = 0;
        pintfhdl->adapter = dev;
        pintfhdl->intf_dev = (u8 *)&(adapter->dvobjpriv);
        if (_init_intf_hdl(adapter, pintfhdl) == false)
                goto register_intf_hdl_fail;
        return _SUCCESS;
register_intf_hdl_fail:
        return false;
}

static  void unregister_intf_hdl(struct intf_hdl *pintfhdl)
{
        _unload_intf_hdl(pintfhdl->pintfpriv);
        memset((u8 *)pintfhdl, 0, sizeof(struct intf_hdl));
}

uint r8712_alloc_io_queue(struct _adapter *adapter)
{
        u32 i;
        struct io_queue *pio_queue;
        struct io_req *pio_req;

        pio_queue = (struct io_queue *)_malloc(sizeof(struct io_queue));
        if (pio_queue == NULL)
                goto alloc_io_queue_fail;
        _init_listhead(&pio_queue->free_ioreqs);
        _init_listhead(&pio_queue->processing);
        _init_listhead(&pio_queue->pending);
        spin_lock_init(&pio_queue->lock);
        pio_queue->pallocated_free_ioreqs_buf = (u8 *)_malloc(NUM_IOREQ *
                                                (sizeof(struct io_req)) + 4);
        if ((pio_queue->pallocated_free_ioreqs_buf) == NULL)
                goto alloc_io_queue_fail;
        memset(pio_queue->pallocated_free_ioreqs_buf, 0,
                        (NUM_IOREQ * (sizeof(struct io_req)) + 4));
        pio_queue->free_ioreqs_buf = pio_queue->pallocated_free_ioreqs_buf + 4
                        - ((addr_t)(pio_queue->pallocated_free_ioreqs_buf)
                        & 3);
        pio_req = (struct io_req *)(pio_queue->free_ioreqs_buf);
        for (i = 0; i < NUM_IOREQ; i++) {
                _init_listhead(&pio_req->list);
                list_insert_tail(&pio_req->list, &pio_queue->free_ioreqs);
                pio_req++;
        }
        if ((register_intf_hdl((u8 *)adapter, &(pio_queue->intf))) == _FAIL)
                goto alloc_io_queue_fail;
        adapter->pio_queue = pio_queue;
        return _SUCCESS;
alloc_io_queue_fail:
        if (pio_queue) {
                kfree(pio_queue->pallocated_free_ioreqs_buf);
                kfree((u8 *)pio_queue);
        }
        adapter->pio_queue = NULL;
        return _FAIL;
}

void r8712_free_io_queue(struct _adapter *adapter)
{
        struct io_queue *pio_queue = (struct io_queue *)(adapter->pio_queue);

        if (pio_queue) {
                kfree(pio_queue->pallocated_free_ioreqs_buf);
                adapter->pio_queue = NULL;
                unregister_intf_hdl(&pio_queue->intf);
                kfree((u8 *)pio_queue);
        }
}