drivers/net/wireless/ath/ar9170/cmd.c

   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
  39 #include "ar9170.h"
  40 #include "cmd.h"
  41
  42 int ar9170_write_mem(struct ar9170 *ar, const __le32 *data, size_t len)
  43 {
  44         int err;
  45
  46         if (unlikely(!IS_ACCEPTING_CMD(ar)))
  47                 return 0;
  48
  49         err = ar->exec_cmd(ar, AR9170_CMD_WMEM, len, (u8 *) data, 0, NULL);
  50         if (err)
  51                 wiphy_debug(ar->hw->wiphy, "writing memory failed\n");
  52         return err;
  53 }
  54
  55 int ar9170_write_reg(struct ar9170 *ar, const u32 reg, const u32 val)
  56 {
  57         const __le32 buf[2] = {
  58                 cpu_to_le32(reg),
  59                 cpu_to_le32(val),
  60         };
  61         int err;
  62
  63         if (unlikely(!IS_ACCEPTING_CMD(ar)))
  64                 return 0;
  65
  66         err = ar->exec_cmd(ar, AR9170_CMD_WREG, sizeof(buf),
  67                            (u8 *) buf, 0, NULL);
  68         if (err)
  69                 wiphy_debug(ar->hw->wiphy, "writing reg %#x (val %#x) failed\n",
  70                             reg, val);
  71         return err;
  72 }
  73
  74 int ar9170_read_mreg(struct ar9170 *ar, int nregs, const u32 *regs, u32 *out)
  75 {
  76         int i, err;
  77         __le32 *offs, *res;
  78
  79         if (unlikely(!IS_ACCEPTING_CMD(ar)))
  80                 return 0;
  81
  82         /* abuse "out" for the register offsets, must be same length */
  83         offs = (__le32 *)out;
  84         for (i = 0; i < nregs; i++)
  85                 offs[i] = cpu_to_le32(regs[i]);
  86
  87         /* also use the same buffer for the input */
  88         res = (__le32 *)out;
  89
  90         err = ar->exec_cmd(ar, AR9170_CMD_RREG,
  91                            4 * nregs, (u8 *)offs,
  92                            4 * nregs, (u8 *)res);
  93         if (err)
  94                 return err;
  95
  96         /* convert result to cpu endian */
  97         for (i = 0; i < nregs; i++)
  98                 out[i] = le32_to_cpu(res[i]);
  99
 100         return 0;
 101 }
 102
 103 int ar9170_read_reg(struct ar9170 *ar, u32 reg, u32 *val)
 104 {
 105         return ar9170_read_mreg(ar, 1, &reg, val);
 106 }
 107
 108 int ar9170_echo_test(struct ar9170 *ar, u32 v)
 109 {
 110         __le32 echobuf = cpu_to_le32(v);
 111         __le32 echores;
 112         int err;
 113
 114         if (unlikely(!IS_ACCEPTING_CMD(ar)))
 115                 return -ENODEV;
 116
 117         err = ar->exec_cmd(ar, AR9170_CMD_ECHO,
 118                            4, (u8 *)&echobuf,
 119                            4, (u8 *)&echores);
 120         if (err)
 121                 return err;
 122
 123         if (echobuf != echores)
 124                 return -EINVAL;
 125
 126         return 0;
 127 }