drivers/staging/rtl8712/rtl871x_io.c

   1 /******************************************************************************
   2  * rtl871x_io.c
   3  *
   4  * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
   5  * Linux device driver for RTL8192SU
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  19  *
  20  * Modifications for inclusion into the Linux staging tree are
  21  * Copyright(c) 2010 Larry Finger. All rights reserved.
  22  *
  23  * Contact information:
  24  * WLAN FAE <wlanfae@realtek.com>
  25  * Larry Finger <Larry.Finger@lwfinger.net>
  26  *
  27  ******************************************************************************/
  28 /*
  29  *
  30  * The purpose of rtl871x_io.c
  31  *
  32  * a. provides the API
  33  * b. provides the protocol engine
  34  * c. provides the software interface between caller and the hardware interface
  35  *
  36  * For r8712u, both sync/async operations are provided.
  37  *
  38  * Only sync read/write_mem operations are provided.
  39  *
  40  */
  41
  42 #define _RTL871X_IO_C_
  43
  44 #include "osdep_service.h"
  45 #include "drv_types.h"
  46 #include "rtl871x_io.h"
  47 #include "osdep_intf.h"
  48 #include "usb_ops.h"
  49
  50 static uint _init_intf_hdl(struct _adapter *padapter,
  51                            struct intf_hdl *pintf_hdl)
  52 {
  53         struct  intf_priv       *pintf_priv;
  54         void (*set_intf_option)(u32 *poption) = NULL;
  55         void (*set_intf_funs)(struct intf_hdl *pintf_hdl);
  56         void (*set_intf_ops)(struct _io_ops     *pops);
  57         uint (*init_intf_priv)(struct intf_priv *pintfpriv);
  58
  59         set_intf_option = &(r8712_usb_set_intf_option);
  60         set_intf_funs = &(r8712_usb_set_intf_funs);
  61         set_intf_ops = &r8712_usb_set_intf_ops;
  62         init_intf_priv = &r8712_usb_init_intf_priv;
  63         pintf_priv = pintf_hdl->pintfpriv = (struct intf_priv *)
  64                      _malloc(sizeof(struct intf_priv));
  65         if (pintf_priv == NULL)
  66                 goto _init_intf_hdl_fail;
  67         pintf_hdl->adapter = (u8 *)padapter;
  68         set_intf_option(&pintf_hdl->intf_option);
  69         set_intf_funs(pintf_hdl);
  70         set_intf_ops(&pintf_hdl->io_ops);
  71         pintf_priv->intf_dev = (u8 *)&(padapter->dvobjpriv);
  72         if (init_intf_priv(pintf_priv) == _FAIL)
  73                 goto _init_intf_hdl_fail;
  74         return _SUCCESS;
  75 _init_intf_hdl_fail:
  76         kfree(pintf_priv);
  77         return _FAIL;
  78 }
  79
  80 static void _unload_intf_hdl(struct intf_priv *pintfpriv)
  81 {
  82         void (*unload_intf_priv)(struct intf_priv *pintfpriv);
  83
  84         unload_intf_priv = &r8712_usb_unload_intf_priv;
  85         unload_intf_priv(pintfpriv);
  86         kfree(pintfpriv);
  87 }
  88
  89 static uint register_intf_hdl(u8 *dev, struct intf_hdl *pintfhdl)
  90 {
  91         struct _adapter *adapter = (struct _adapter *)dev;
  92
  93         pintfhdl->intf_option = 0;
  94         pintfhdl->adapter = dev;
  95         pintfhdl->intf_dev = (u8 *)&(adapter->dvobjpriv);
  96         if (_init_intf_hdl(adapter, pintfhdl) == false)
  97                 goto register_intf_hdl_fail;
  98         return _SUCCESS;
  99 register_intf_hdl_fail:
 100         return false;
 101 }
 102
 103 static  void unregister_intf_hdl(struct intf_hdl *pintfhdl)
 104 {
 105         _unload_intf_hdl(pintfhdl->pintfpriv);
 106         memset((u8 *)pintfhdl, 0, sizeof(struct intf_hdl));
 107 }
 108
 109 uint r8712_alloc_io_queue(struct _adapter *adapter)
 110 {
 111         u32 i;
 112         struct io_queue *pio_queue;
 113         struct io_req *pio_req;
 114
 115         pio_queue = (struct io_queue *)_malloc(sizeof(struct io_queue));
 116         if (pio_queue == NULL)
 117                 goto alloc_io_queue_fail;
 118         _init_listhead(&pio_queue->free_ioreqs);
 119         _init_listhead(&pio_queue->processing);
 120         _init_listhead(&pio_queue->pending);
 121         spin_lock_init(&pio_queue->lock);
 122         pio_queue->pallocated_free_ioreqs_buf = (u8 *)_malloc(NUM_IOREQ *
 123                                                 (sizeof(struct io_req)) + 4);
 124         if ((pio_queue->pallocated_free_ioreqs_buf) == NULL)
 125                 goto alloc_io_queue_fail;
 126         memset(pio_queue->pallocated_free_ioreqs_buf, 0,
 127                         (NUM_IOREQ * (sizeof(struct io_req)) + 4));
 128         pio_queue->free_ioreqs_buf = pio_queue->pallocated_free_ioreqs_buf + 4
 129                         - ((addr_t)(pio_queue->pallocated_free_ioreqs_buf)
 130                         & 3);
 131         pio_req = (struct io_req *)(pio_queue->free_ioreqs_buf);
 132         for (i = 0; i < NUM_IOREQ; i++) {
 133                 _init_listhead(&pio_req->list);
 134                 sema_init(&pio_req->sema, 0);
 135                 list_insert_tail(&pio_req->list, &pio_queue->free_ioreqs);
 136                 pio_req++;
 137         }
 138         if ((register_intf_hdl((u8 *)adapter, &(pio_queue->intf))) == _FAIL)
 139                 goto alloc_io_queue_fail;
 140         adapter->pio_queue = pio_queue;
 141         return _SUCCESS;
 142 alloc_io_queue_fail:
 143         if (pio_queue) {
 144                 kfree(pio_queue->pallocated_free_ioreqs_buf);
 145                 kfree((u8 *)pio_queue);
 146         }
 147         adapter->pio_queue = NULL;
 148         return _FAIL;
 149 }
 150
 151 void r8712_free_io_queue(struct _adapter *adapter)
 152 {
 153         struct io_queue *pio_queue = (struct io_queue *)(adapter->pio_queue);
 154
 155         if (pio_queue) {
 156                 kfree(pio_queue->pallocated_free_ioreqs_buf);
 157                 adapter->pio_queue = NULL;
 158                 unregister_intf_hdl(&pio_queue->intf);
 159                 kfree((u8 *)pio_queue);
 160         }
 161 }