drivers/net/wireless/ath/carl9170/cmd.c

   1 /*
   2  * Atheros CARL9170 driver
   3  *
   4  * Basic HW register/memory/command access functions
   5  *
   6  * Copyright 2008, Johannes Berg <[email protected]>
   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 <asm/div64.h>
  40 #include "carl9170.h"
  41 #include "cmd.h"
  42
  43 int carl9170_write_reg(struct ar9170 *ar, const u32 reg, const u32 val)
  44 {
  45         const __le32 buf[2] = {
  46                 cpu_to_le32(reg),
  47                 cpu_to_le32(val),
  48         };
  49         int err;
  50
  51         err = carl9170_exec_cmd(ar, CARL9170_CMD_WREG, sizeof(buf),
  52                                 (u8 *) buf, 0, NULL);
  53         if (err) {
  54                 if (net_ratelimit()) {
  55                         wiphy_err(ar->hw->wiphy, "writing reg %#x "
  56                                 "(val %#x) failed (%d)\n", reg, val, err);
  57                 }
  58         }
  59         return err;
  60 }
  61
  62 int carl9170_read_mreg(struct ar9170 *ar, const int nregs,
  63                        const u32 *regs, u32 *out)
  64 {
  65         int i, err;
  66         __le32 *offs, *res;
  67
  68         /* abuse "out" for the register offsets, must be same length */
  69         offs = (__le32 *)out;
  70         for (i = 0; i < nregs; i++)
  71                 offs[i] = cpu_to_le32(regs[i]);
  72
  73         /* also use the same buffer for the input */
  74         res = (__le32 *)out;
  75
  76         err = carl9170_exec_cmd(ar, CARL9170_CMD_RREG,
  77                                 4 * nregs, (u8 *)offs,
  78                                 4 * nregs, (u8 *)res);
  79         if (err) {
  80                 if (net_ratelimit()) {
  81                         wiphy_err(ar->hw->wiphy, "reading regs failed (%d)\n",
  82                                   err);
  83                 }
  84                 return err;
  85         }
  86
  87         /* convert result to cpu endian */
  88         for (i = 0; i < nregs; i++)
  89                 out[i] = le32_to_cpu(res[i]);
  90
  91         return 0;
  92 }
  93
  94 int carl9170_read_reg(struct ar9170 *ar, u32 reg, u32 *val)
  95 {
  96         return carl9170_read_mreg(ar, 1, &reg, val);
  97 }
  98
  99 int carl9170_echo_test(struct ar9170 *ar, const u32 v)
 100 {
 101         u32 echores;
 102         int err;
 103
 104         err = carl9170_exec_cmd(ar, CARL9170_CMD_ECHO,
 105                                 4, (u8 *)&v,
 106                                 4, (u8 *)&echores);
 107         if (err)
 108                 return err;
 109
 110         if (v != echores) {
 111                 wiphy_info(ar->hw->wiphy, "wrong echo %x != %x", v, echores);
 112                 return -EINVAL;
 113         }
 114
 115         return 0;
 116 }
 117
 118 struct carl9170_cmd *carl9170_cmd_buf(struct ar9170 *ar,
 119         const enum carl9170_cmd_oids cmd, const unsigned int len)
 120 {
 121         struct carl9170_cmd *tmp;
 122
 123         tmp = kzalloc(sizeof(struct carl9170_cmd_head) + len, GFP_ATOMIC);
 124         if (tmp) {
 125                 tmp->hdr.cmd = cmd;
 126                 tmp->hdr.len = len;
 127         }
 128
 129         return tmp;
 130 }
 131
 132 int carl9170_reboot(struct ar9170 *ar)
 133 {
 134         struct carl9170_cmd *cmd;
 135         int err;
 136
 137         cmd = carl9170_cmd_buf(ar, CARL9170_CMD_REBOOT_ASYNC, 0);
 138         if (!cmd)
 139                 return -ENOMEM;
 140
 141         err = __carl9170_exec_cmd(ar, cmd, true);
 142         return err;
 143 }
 144
 145 int carl9170_mac_reset(struct ar9170 *ar)
 146 {
 147         return carl9170_exec_cmd(ar, CARL9170_CMD_SWRST,
 148                                  0, NULL, 0, NULL);
 149 }
 150
 151 int carl9170_bcn_ctrl(struct ar9170 *ar, const unsigned int vif_id,
 152                        const u32 mode, const u32 addr, const u32 len)
 153 {
 154         struct carl9170_cmd *cmd;
 155
 156         cmd = carl9170_cmd_buf(ar, CARL9170_CMD_BCN_CTRL_ASYNC,
 157                                sizeof(struct carl9170_bcn_ctrl_cmd));
 158         if (!cmd)
 159                 return -ENOMEM;
 160
 161         cmd->bcn_ctrl.vif_id = cpu_to_le32(vif_id);
 162         cmd->bcn_ctrl.mode = cpu_to_le32(mode);
 163         cmd->bcn_ctrl.bcn_addr = cpu_to_le32(addr);
 164         cmd->bcn_ctrl.bcn_len = cpu_to_le32(len);
 165
 166         return __carl9170_exec_cmd(ar, cmd, true);
 167 }
 168
 169 int carl9170_collect_tally(struct ar9170 *ar)
 170 {
 171         struct carl9170_tally_rsp tally;
 172         struct survey_info *info;
 173         unsigned int tick;
 174         int err;
 175
 176         err = carl9170_exec_cmd(ar, CARL9170_CMD_TALLY, 0, NULL,
 177                                 sizeof(tally), (u8 *)&tally);
 178         if (err)
 179                 return err;
 180
 181         tick = le32_to_cpu(tally.tick);
 182         if (tick) {
 183                 ar->tally.active += le32_to_cpu(tally.active) / tick;
 184                 ar->tally.cca += le32_to_cpu(tally.cca) / tick;
 185                 ar->tally.tx_time += le32_to_cpu(tally.tx_time) / tick;
 186                 ar->tally.rx_total += le32_to_cpu(tally.rx_total);
 187                 ar->tally.rx_overrun += le32_to_cpu(tally.rx_overrun);
 188
 189                 if (ar->channel) {
 190                         info = &ar->survey[ar->channel->hw_value];
 191                         info->time = ar->tally.active;
 192                         info->time_busy = ar->tally.cca;
 193                         info->time_tx = ar->tally.tx_time;
 194                         do_div(info->time, 1000);
 195                         do_div(info->time_busy, 1000);
 196                         do_div(info->time_tx, 1000);
 197                 }
 198         }
 199         return 0;
 200 }
 201
 202 int carl9170_powersave(struct ar9170 *ar, const bool ps)
 203 {
 204         struct carl9170_cmd *cmd;
 205         u32 state;
 206
 207         cmd = carl9170_cmd_buf(ar, CARL9170_CMD_PSM_ASYNC,
 208                                sizeof(struct carl9170_psm));
 209         if (!cmd)
 210                 return -ENOMEM;
 211
 212         if (ps) {
 213                 /* Sleep until next TBTT */
 214                 state = CARL9170_PSM_SLEEP | 1;
 215         } else {
 216                 /* wake up immediately */
 217                 state = 1;
 218         }
 219
 220         cmd->psm.state = cpu_to_le32(state);
 221         return __carl9170_exec_cmd(ar, cmd, true);
 222 }