drivers/net/wireless/ar9170/cmd.h

   1 /*
   2  * Atheros AR9170 driver
   3  *
   4  * Basic HW register/memory/command access functions
   5  *
   6  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; see the file COPYING.  If not, see
  20  * http://www.gnu.org/licenses/.
  21  *
  22  * This file incorporates work covered by the following copyright and
  23  * permission notice:
  24  *    Copyright (c) 2007-2008 Atheros Communications, Inc.
  25  *
  26  *    Permission to use, copy, modify, and/or distribute this software for any
  27  *    purpose with or without fee is hereby granted, provided that the above
  28  *    copyright notice and this permission notice appear in all copies.
  29  *
  30  *    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  31  *    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  32  *    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  33  *    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  34  *    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  35  *    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  36  *    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  37  */
  38 #ifndef __CMD_H
  39 #define __CMD_H
  40
  41 #include "ar9170.h"
  42
  43 /* basic HW access */
  44 int ar9170_write_mem(struct ar9170 *ar, const __le32 *data, size_t len);
  45 int ar9170_write_reg(struct ar9170 *ar, const u32 reg, const u32 val);
  46 int ar9170_read_reg(struct ar9170 *ar, u32 reg, u32 *val);
  47 int ar9170_echo_test(struct ar9170 *ar, u32 v);
  48
  49 /*
  50  * Macros to facilitate writing multiple registers in a single
  51  * write-combining USB command. Note that when the first group
  52  * fails the whole thing will fail without any others attempted,
  53  * but you won't know which write in the group failed.
  54  */
  55 #define ar9170_regwrite_begin(ar)                                       \
  56 do {                                                                    \
  57         int __nreg = 0, __err = 0;                                      \
  58         struct ar9170 *__ar = ar;
  59
  60 #define ar9170_regwrite(r, v) do {                                      \
  61         __ar->cmdbuf[2 * __nreg + 1] = cpu_to_le32(r);                  \
  62         __ar->cmdbuf[2 * __nreg + 2] = cpu_to_le32(v);                  \
  63         __nreg++;                                                       \
  64         if ((__nreg >= PAYLOAD_MAX/2)) {                                \
  65                 if (IS_ACCEPTING_CMD(__ar))                             \
  66                         __err = ar->exec_cmd(__ar, AR9170_CMD_WREG,     \
  67                                              8 * __nreg,                \
  68                                              (u8 *) &__ar->cmdbuf[1],   \
  69                                              0, NULL);                  \
  70                 __nreg = 0;                                             \
  71                 if (__err)                                              \
  72                         goto __regwrite_out;                            \
  73         }                                                               \
  74 } while (0)
  75
  76 #define ar9170_regwrite_finish()                                        \
  77 __regwrite_out :                                                        \
  78         if (__nreg) {                                                   \
  79                 if (IS_ACCEPTING_CMD(__ar))                             \
  80                         __err = ar->exec_cmd(__ar, AR9170_CMD_WREG,     \
  81                                              8 * __nreg,                \
  82                                              (u8 *) &__ar->cmdbuf[1],   \
  83                                              0, NULL);                  \
  84                 __nreg = 0;                                             \
  85         }
  86
  87 #define ar9170_regwrite_result()                                        \
  88         __err;                                                          \
  89 } while (0);
  90
  91 #endif /* __CMD_H */