LXR linux/drivers/net/wireless/ath/ath9k/ar9003

   1/*
   2 * Copyright (c) 2010-2011 Atheros Communications Inc.
   3 *
   4 * Permission to use, copy, modify, and/or distribute this software for any
   5 * purpose with or without fee is hereby granted, provided that the above
   6 * copyright notice and this permission notice appear in all copies.
   7 *
   8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15 */
  16
  17#include "hw.h"
  18#include "hw-ops.h"
  19#include "ar9003_phy.h"
  20#include "ar9003_rtt.h"
  21
  22#define RTT_RESTORE_TIMEOUT          1000
  23#define RTT_ACCESS_TIMEOUT           100
  24#define RTT_BAD_VALUE                0x0bad0bad
  25
  26/*
  27 * RTT (Radio Retention Table) hardware implementation information
  28 *
  29 * There is an internal table (i.e. the rtt) for each chain (or bank).
  30 * Each table contains 6 entries and each entry is corresponding to
  31 * a specific calibration parameter as depicted below.
  32 *  0~2 - DC offset DAC calibration: loop, low, high (offsetI/Q_...)
  33 *  3   - Filter cal (filterfc)
  34 *  4   - RX gain settings
  35 *  5   - Peak detector offset calibration (agc_caldac)
  36 */
  37
  38void ar9003_hw_rtt_enable(struct ath_hw *ah)
  39{
  40        REG_WRITE(ah, AR_PHY_RTT_CTRL, 1);
  41}
  42
  43void ar9003_hw_rtt_disable(struct ath_hw *ah)
  44{
  45        REG_WRITE(ah, AR_PHY_RTT_CTRL, 0);
  46}
  47
  48void ar9003_hw_rtt_set_mask(struct ath_hw *ah, u32 rtt_mask)
  49{
  50        REG_RMW_FIELD(ah, AR_PHY_RTT_CTRL,
  51                      AR_PHY_RTT_CTRL_RESTORE_MASK, rtt_mask);
  52}
  53
  54bool ar9003_hw_rtt_force_restore(struct ath_hw *ah)
  55{
  56        if (!ath9k_hw_wait(ah, AR_PHY_RTT_CTRL,
  57                           AR_PHY_RTT_CTRL_FORCE_RADIO_RESTORE,
  58                           0, RTT_RESTORE_TIMEOUT))
  59                return false;
  60
  61        REG_RMW_FIELD(ah, AR_PHY_RTT_CTRL,
  62                      AR_PHY_RTT_CTRL_FORCE_RADIO_RESTORE, 1);
  63
  64        if (!ath9k_hw_wait(ah, AR_PHY_RTT_CTRL,
  65                           AR_PHY_RTT_CTRL_FORCE_RADIO_RESTORE,
  66                           0, RTT_RESTORE_TIMEOUT))
  67                return false;
  68
  69        return true;
  70}
  71
  72static void ar9003_hw_rtt_load_hist_entry(struct ath_hw *ah, u8 chain,
  73                                          u32 index, u32 data28)
  74{
  75        u32 val;
  76
  77        val = SM(data28, AR_PHY_RTT_SW_RTT_TABLE_DATA);
  78        REG_WRITE(ah, AR_PHY_RTT_TABLE_SW_INTF_1_B(chain), val);
  79
  80        val = SM(0, AR_PHY_RTT_SW_RTT_TABLE_ACCESS) |
  81              SM(1, AR_PHY_RTT_SW_RTT_TABLE_WRITE) |
  82              SM(index, AR_PHY_RTT_SW_RTT_TABLE_ADDR);
  83        REG_WRITE(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain), val);
  84        udelay(1);
  85
  86        val |= SM(1, AR_PHY_RTT_SW_RTT_TABLE_ACCESS);
  87        REG_WRITE(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain), val);
  88        udelay(1);
  89
  90        if (!ath9k_hw_wait(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain),
  91                           AR_PHY_RTT_SW_RTT_TABLE_ACCESS, 0,
  92                           RTT_ACCESS_TIMEOUT))
  93                return;
  94
  95        val &= ~SM(1, AR_PHY_RTT_SW_RTT_TABLE_WRITE);
  96        REG_WRITE(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain), val);
  97        udelay(1);
  98
  99        ath9k_hw_wait(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain),
 100                      AR_PHY_RTT_SW_RTT_TABLE_ACCESS, 0,
 101                      RTT_ACCESS_TIMEOUT);
 102}
 103
 104void ar9003_hw_rtt_load_hist(struct ath_hw *ah)
 105{
 106        int chain, i;
 107
 108        for (chain = 0; chain < AR9300_MAX_CHAINS; chain++) {
 109                if (!(ah->rxchainmask & (1 << chain)))
 110                        continue;
 111                for (i = 0; i < MAX_RTT_TABLE_ENTRY; i++) {
 112                        ar9003_hw_rtt_load_hist_entry(ah, chain, i,
 113                                              ah->caldata->rtt_table[chain][i]);
 114                        ath_dbg(ath9k_hw_common(ah), CALIBRATE,
 115                                "Load RTT value at idx %d, chain %d: 0x%x\n",
 116                                i, chain, ah->caldata->rtt_table[chain][i]);
 117                }
 118        }
 119}
 120
 121static int ar9003_hw_rtt_fill_hist_entry(struct ath_hw *ah, u8 chain, u32 index)
 122{
 123        u32 val;
 124
 125        val = SM(0, AR_PHY_RTT_SW_RTT_TABLE_ACCESS) |
 126              SM(0, AR_PHY_RTT_SW_RTT_TABLE_WRITE) |
 127              SM(index, AR_PHY_RTT_SW_RTT_TABLE_ADDR);
 128
 129        REG_WRITE(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain), val);
 130        udelay(1);
 131
 132        val |= SM(1, AR_PHY_RTT_SW_RTT_TABLE_ACCESS);
 133        REG_WRITE(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain), val);
 134        udelay(1);
 135
 136        if (!ath9k_hw_wait(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain),
 137                           AR_PHY_RTT_SW_RTT_TABLE_ACCESS, 0,
 138                           RTT_ACCESS_TIMEOUT))
 139                return RTT_BAD_VALUE;
 140
 141        val = MS(REG_READ(ah, AR_PHY_RTT_TABLE_SW_INTF_1_B(chain)),
 142                 AR_PHY_RTT_SW_RTT_TABLE_DATA);
 143
 144
 145        return val;
 146}
 147
 148void ar9003_hw_rtt_fill_hist(struct ath_hw *ah)
 149{
 150        int chain, i;
 151
 152        for (chain = 0; chain < AR9300_MAX_CHAINS; chain++) {
 153                if (!(ah->rxchainmask & (1 << chain)))
 154                        continue;
 155                for (i = 0; i < MAX_RTT_TABLE_ENTRY; i++) {
 156                        ah->caldata->rtt_table[chain][i] =
 157                                ar9003_hw_rtt_fill_hist_entry(ah, chain, i);
 158                        ath_dbg(ath9k_hw_common(ah), CALIBRATE,
 159                                "RTT value at idx %d, chain %d is: 0x%x\n",
 160                                i, chain, ah->caldata->rtt_table[chain][i]);
 161                }
 162        }
 163
 164        ah->caldata->rtt_done = true;
 165}
 166
 167void ar9003_hw_rtt_clear_hist(struct ath_hw *ah)
 168{
 169        int chain, i;
 170
 171        for (chain = 0; chain < AR9300_MAX_CHAINS; chain++) {
 172                if (!(ah->rxchainmask & (1 << chain)))
 173                        continue;
 174                for (i = 0; i < MAX_RTT_TABLE_ENTRY; i++)
 175                        ar9003_hw_rtt_load_hist_entry(ah, chain, i, 0);
 176        }
 177
 178        if (ah->caldata)
 179                ah->caldata->rtt_done = false;
 180}
 181
 182bool ar9003_hw_rtt_restore(struct ath_hw *ah, struct ath9k_channel *chan)
 183{
 184        bool restore;
 185
 186        if (!ah->caldata)
 187                return false;
 188
 189        if (!ah->caldata->rtt_done)
 190                return false;
 191
 192        ar9003_hw_rtt_enable(ah);
 193        ar9003_hw_rtt_set_mask(ah, 0x10);
 194
 195        if (!ath9k_hw_rfbus_req(ah)) {
 196                ath_err(ath9k_hw_common(ah), "Could not stop baseband\n");
 197                restore = false;
 198                goto fail;
 199        }
 200
 201        ar9003_hw_rtt_load_hist(ah);
 202        restore = ar9003_hw_rtt_force_restore(ah);
 203
 204fail:
 205        ath9k_hw_rfbus_done(ah);
 206        ar9003_hw_rtt_disable(ah);
 207        return restore;
 208}
 209