package/kernel/mac80211/patches/550-ath9k_entropy_from_adc.patch

   1 --- a/drivers/net/wireless/ath/ath9k/hw.h
   2 +++ b/drivers/net/wireless/ath/ath9k/hw.h
   3 @@ -678,6 +678,7 @@ struct ath_spec_scan {
   4   * @config_pci_powersave:
   5   * @calibrate: periodic calibration for NF, ANI, IQ, ADC gain, ADC-DC
   6   *
   7 + * @get_adc_entropy: get entropy from the raw ADC I/Q output
   8   * @spectral_scan_config: set parameters for spectral scan and enable/disable it
   9   * @spectral_scan_trigger: trigger a spectral scan run
  10   * @spectral_scan_wait: wait for a spectral scan run to finish
  11 @@ -701,6 +702,7 @@ struct ath_hw_ops {
  12                         struct ath_hw_antcomb_conf *antconf);
  13         void (*antdiv_comb_conf_set)(struct ath_hw *ah,
  14                         struct ath_hw_antcomb_conf *antconf);
  15 +       void (*get_adc_entropy)(struct ath_hw *ah, u8 *buf, size_t len);
  16         void (*spectral_scan_config)(struct ath_hw *ah,
  17                                      struct ath_spec_scan *param);
  18         void (*spectral_scan_trigger)(struct ath_hw *ah);
  19 --- a/drivers/net/wireless/ath/ath9k/ar9003_phy.c
  20 +++ b/drivers/net/wireless/ath/ath9k/ar9003_phy.c
  21 @@ -1764,6 +1764,26 @@ static void ar9003_hw_tx99_set_txpower(s
  22                   ATH9K_POW_SM(p_pwr_array[ALL_TARGET_HT40_14],  0));
  23  }
  24
  25 +static void ar9003_hw_get_adc_entropy(struct ath_hw *ah, u8 *buf, size_t len)
  26 +{
  27 +       int i, j;
  28 +
  29 +       REG_RMW_FIELD(ah, AR_PHY_TEST, AR_PHY_TEST_BBB_OBS_SEL, 1);
  30 +       REG_CLR_BIT(ah, AR_PHY_TEST, AR_PHY_TEST_RX_OBS_SEL_BIT5);
  31 +       REG_RMW_FIELD(ah, AR_PHY_TEST_CTL_STATUS, AR_PHY_TEST_CTL_RX_OBS_SEL, 0);
  32 +
  33 +       memset(buf, 0, len);
  34 +       for (i = 0; i < len; i++) {
  35 +               for (j = 0; j < 4; j++) {
  36 +                       u32 regval = REG_READ(ah, AR_PHY_TST_ADC);
  37 +
  38 +                       buf[i] <<= 2;
  39 +                       buf[i] |= (regval & 1) | ((regval & BIT(10)) >> 9);
  40 +                       udelay(1);
  41 +               }
  42 +       }
  43 +}
  44 +
  45  void ar9003_hw_attach_phy_ops(struct ath_hw *ah)
  46  {
  47         struct ath_hw_private_ops *priv_ops = ath9k_hw_private_ops(ah);
  48 @@ -1794,6 +1814,7 @@ void ar9003_hw_attach_phy_ops(struct ath
  49         priv_ops->set_radar_params = ar9003_hw_set_radar_params;
  50         priv_ops->fast_chan_change = ar9003_hw_fast_chan_change;
  51
  52 +       ops->get_adc_entropy = ar9003_hw_get_adc_entropy;
  53         ops->antdiv_comb_conf_get = ar9003_hw_antdiv_comb_conf_get;
  54         ops->antdiv_comb_conf_set = ar9003_hw_antdiv_comb_conf_set;
  55         ops->spectral_scan_config = ar9003_hw_spectral_scan_config;
  56 --- a/drivers/net/wireless/ath/ath9k/init.c
  57 +++ b/drivers/net/wireless/ath/ath9k/init.c
  58 @@ -846,7 +846,8 @@ static void ath9k_init_txpower_limits(st
  59         if (ah->caps.hw_caps & ATH9K_HW_CAP_5GHZ)
  60                 ath9k_init_band_txpower(sc, IEEE80211_BAND_5GHZ);
  61
  62 -       ah->curchan = curchan;
  63 +       if (curchan)
  64 +               ah->curchan = curchan;
  65  }
  66
  67  void ath9k_reload_chainmask_settings(struct ath_softc *sc)
  68 @@ -980,6 +981,18 @@ static void ath9k_set_hw_capab(struct at
  69         SET_IEEE80211_PERM_ADDR(hw, common->macaddr);
  70  }
  71
  72 +static void ath_get_initial_entropy(struct ath_softc *sc)
  73 +{
  74 +       struct ath_hw *ah = sc->sc_ah;
  75 +       char buf[256];
  76 +
  77 +       /* reuse last channel initialized by the tx power test */
  78 +       ath9k_hw_reset(ah, ah->curchan, NULL, false);
  79 +
  80 +       ath9k_hw_get_adc_entropy(ah, buf, sizeof(buf));
  81 +       add_device_randomness(buf, sizeof(buf));
  82 +}
  83 +
  84  int ath9k_init_device(u16 devid, struct ath_softc *sc,
  85                     const struct ath_bus_ops *bus_ops)
  86  {
  87 @@ -1025,6 +1038,8 @@ int ath9k_init_device(u16 devid, struct
  88                 ARRAY_SIZE(ath9k_tpt_blink));
  89  #endif
  90
  91 +       ath_get_initial_entropy(sc);
  92 +
  93         /* Register with mac80211 */
  94         error = ieee80211_register_hw(hw);
  95         if (error)
  96 --- a/drivers/net/wireless/ath/ath9k/hw-ops.h
  97 +++ b/drivers/net/wireless/ath/ath9k/hw-ops.h
  98 @@ -95,6 +95,12 @@ static inline void ath9k_hw_tx99_set_txp
  99                 ath9k_hw_ops(ah)->tx99_set_txpower(ah, power);
 100  }
 101
 102 +static inline void ath9k_hw_get_adc_entropy(struct ath_hw *ah,
 103 +               u8 *buf, size_t len)
 104 +{
 105 +       ath9k_hw_ops(ah)->get_adc_entropy(ah, buf, len);
 106 +}
 107 +
 108  #ifdef CPTCFG_ATH9K_BTCOEX_SUPPORT
 109
 110  static inline void ath9k_hw_set_bt_ant_diversity(struct ath_hw *ah, bool enable)
 111 --- a/drivers/net/wireless/ath/ath9k/link.c
 112 +++ b/drivers/net/wireless/ath/ath9k/link.c
 113 @@ -307,6 +307,11 @@ void ath_ani_calibrate(unsigned long dat
 114         unsigned int timestamp = jiffies_to_msecs(jiffies);
 115         u32 cal_interval, short_cal_interval, long_cal_interval;
 116         unsigned long flags;
 117 +       char buf[256];
 118 +
 119 +       /* gather entropy */
 120 +       ath9k_hw_get_adc_entropy(ah, buf, sizeof(buf));
 121 +       add_device_randomness(buf, sizeof(buf));
 122
 123         if (ah->caldata && test_bit(NFCAL_INTF, &ah->caldata->cal_flags))
 124                 long_cal_interval = ATH_LONG_CALINTERVAL_INT;
 125 --- a/drivers/net/wireless/ath/ath9k/ar5008_phy.c
 126 +++ b/drivers/net/wireless/ath/ath9k/ar5008_phy.c
 127 @@ -1296,9 +1296,30 @@ static void ar5008_hw_set_radar_conf(str
 128         conf->radar_inband = 8;
 129  }
 130
 131 +static void ar5008_hw_get_adc_entropy(struct ath_hw *ah, u8 *buf, size_t len)
 132 +{
 133 +       int i, j;
 134 +
 135 +       REG_RMW_FIELD(ah, AR_PHY_TEST, AR_PHY_TEST_BBB_OBS_SEL, 1);
 136 +       REG_CLR_BIT(ah, AR_PHY_TEST, AR_PHY_TEST_RX_OBS_SEL_BIT5);
 137 +       REG_RMW_FIELD(ah, AR_PHY_TEST2, AR_PHY_TEST2_RX_OBS_SEL, 0);
 138 +
 139 +       memset(buf, 0, len);
 140 +       for (i = 0; i < len; i++) {
 141 +               for (j = 0; j < 4; j++) {
 142 +                       u32 regval = REG_READ(ah, AR_PHY_TST_ADC);
 143 +
 144 +                       buf[i] <<= 2;
 145 +                       buf[i] |= (regval & 1) | ((regval & BIT(9)) >> 8);
 146 +                       udelay(1);
 147 +               }
 148 +       }
 149 +}
 150 +
 151  int ar5008_hw_attach_phy_ops(struct ath_hw *ah)
 152  {
 153         struct ath_hw_private_ops *priv_ops = ath9k_hw_private_ops(ah);
 154 +       struct ath_hw_ops *ops = ath9k_hw_ops(ah);
 155         static const u32 ar5416_cca_regs[6] = {
 156                 AR_PHY_CCA,
 157                 AR_PHY_CH1_CCA,
 158 @@ -1313,6 +1334,8 @@ int ar5008_hw_attach_phy_ops(struct ath_
 159         if (ret)
 160             return ret;
 161
 162 +       ops->get_adc_entropy = ar5008_hw_get_adc_entropy;
 163 +
 164         priv_ops->rf_set_freq = ar5008_hw_set_channel;
 165         priv_ops->spur_mitigate_freq = ar5008_hw_spur_mitigate;
 166
 167 --- a/drivers/net/wireless/ath/ath9k/ar9002_phy.h
 168 +++ b/drivers/net/wireless/ath/ath9k/ar9002_phy.h
 169 @@ -20,6 +20,12 @@
 170  #define PHY_AGC_CLR             0x10000000
 171  #define RFSILENT_BB             0x00002000
 172
 173 +#define AR_PHY_TEST_BBB_OBS_SEL       0x780000
 174 +#define AR_PHY_TEST_BBB_OBS_SEL_S     19
 175 +
 176 +#define AR_PHY_TEST_RX_OBS_SEL_BIT5_S 23
 177 +#define AR_PHY_TEST_RX_OBS_SEL_BIT5   (1 << AR_PHY_TEST_RX_OBS_SEL_BIT5_S)
 178 +
 179  #define AR_PHY_TURBO                0x9804
 180  #define AR_PHY_FC_TURBO_MODE        0x00000001
 181  #define AR_PHY_FC_TURBO_SHORT       0x00000002
 182 @@ -36,6 +42,9 @@
 183
 184  #define AR_PHY_TEST2                   0x9808
 185
 186 +#define AR_PHY_TEST2_RX_OBS_SEL        0x3C00
 187 +#define AR_PHY_TEST2_RX_OBS_SEL_S      10
 188 +
 189  #define AR_PHY_TIMING2           0x9810
 190  #define AR_PHY_TIMING3           0x9814
 191  #define AR_PHY_TIMING3_DSC_MAN   0xFFFE0000
 192 @@ -390,6 +399,8 @@
 193  #define AR_PHY_RFBUS_GRANT       0x9C20
 194  #define AR_PHY_RFBUS_GRANT_EN    0x00000001
 195
 196 +#define AR_PHY_TST_ADC      0x9C24
 197 +
 198  #define AR_PHY_CHAN_INFO_GAIN_DIFF             0x9CF4
 199  #define AR_PHY_CHAN_INFO_GAIN_DIFF_UPPER_LIMIT 320
 200