drivers/net/wireless/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                 printk(KERN_DEBUG "%s: writing memory failed\n",
  52                        wiphy_name(ar->hw->wiphy));
  53         return err;
  54 }
  55
  56 int ar9170_write_reg(struct ar9170 *ar, const u32 reg, const u32 val)
  57 {
  58         __le32 buf[2] = {
  59                 cpu_to_le32(reg),
  60                 cpu_to_le32(val),
  61         };
  62         int err;
  63
  64         if (unlikely(!IS_ACCEPTING_CMD(ar)))
  65                 return 0;
  66
  67         err = ar->exec_cmd(ar, AR9170_CMD_WREG, sizeof(buf),
  68                            (u8 *) buf, 0, NULL);
  69         if (err)
  70                 printk(KERN_DEBUG "%s: writing reg %#x (val %#x) failed\n",
  71                        wiphy_name(ar->hw->wiphy), reg, val);
  72         return err;
  73 }
  74
  75 static int ar9170_read_mreg(struct ar9170 *ar, int nregs,
  76                             const u32 *regs, u32 *out)
  77 {
  78         int i, err;
  79         __le32 *offs, *res;
  80
  81         if (unlikely(!IS_ACCEPTING_CMD(ar)))
  82                 return 0;
  83
  84         /* abuse "out" for the register offsets, must be same length */
  85         offs = (__le32 *)out;
  86         for (i = 0; i < nregs; i++)
  87                 offs[i] = cpu_to_le32(regs[i]);
  88
  89         /* also use the same buffer for the input */
  90         res = (__le32 *)out;
  91
  92         err = ar->exec_cmd(ar, AR9170_CMD_RREG,
  93                            4 * nregs, (u8 *)offs,
  94                            4 * nregs, (u8 *)res);
  95         if (err)
  96                 return err;
  97
  98         /* convert result to cpu endian */
  99         for (i = 0; i < nregs; i++)
 100                 out[i] = le32_to_cpu(res[i]);
 101
 102         return 0;
 103 }
 104
 105 int ar9170_read_reg(struct ar9170 *ar, u32 reg, u32 *val)
 106 {
 107         return ar9170_read_mreg(ar, 1, &reg, val);
 108 }
 109
 110 int ar9170_echo_test(struct ar9170 *ar, u32 v)
 111 {
 112         __le32 echobuf = cpu_to_le32(v);
 113         __le32 echores;
 114         int err;
 115
 116         if (unlikely(!IS_ACCEPTING_CMD(ar)))
 117                 return -ENODEV;
 118
 119         err = ar->exec_cmd(ar, AR9170_CMD_ECHO,
 120                            4, (u8 *)&echobuf,
 121                            4, (u8 *)&echores);
 122         if (err)
 123                 return err;
 124
 125         if (echobuf != echores)
 126                 return -EINVAL;
 127
 128         return 0;
 129 }