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ath9k: gather entropy from raw ADC I/Q samples (use the least significant bit only)

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Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 38486
This commit is contained in:
Felix Fietkau 2013-10-20 17:51:17 +00:00
parent 50458fb24c
commit 537e301fab
1 changed files with 200 additions and 0 deletions
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200
package/kernel/mac80211/patches/550-ath9k_entropy_from_adc.patch Normal file
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@ -0,0 +1,200 @@
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -676,6 +676,7 @@ struct ath_spec_scan {
* @config_pci_powersave:
* @calibrate: periodic calibration for NF, ANI, IQ, ADC gain, ADC-DC
*
+ * @get_adc_entropy: get entropy from the raw ADC I/Q output
* @spectral_scan_config: set parameters for spectral scan and enable/disable it
* @spectral_scan_trigger: trigger a spectral scan run
* @spectral_scan_wait: wait for a spectral scan run to finish
@@ -698,6 +699,7 @@ struct ath_hw_ops {
struct ath_hw_antcomb_conf *antconf);
void (*antdiv_comb_conf_set)(struct ath_hw *ah,
struct ath_hw_antcomb_conf *antconf);
+ void (*get_adc_entropy)(struct ath_hw *ah, u8 *buf, size_t len);
void (*spectral_scan_config)(struct ath_hw *ah,
struct ath_spec_scan *param);
void (*spectral_scan_trigger)(struct ath_hw *ah);
--- a/drivers/net/wireless/ath/ath9k/ar9003_phy.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_phy.c
@@ -1609,6 +1609,26 @@ static void ar9003_hw_spectral_scan_wait
}
}
+static void ar9003_hw_get_adc_entropy(struct ath_hw *ah, u8 *buf, size_t len)
+{
+ int i, j;
+
+ REG_RMW_FIELD(ah, AR_PHY_TEST, AR_PHY_TEST_BBB_OBS_SEL, 1);
+ REG_CLR_BIT(ah, AR_PHY_TEST, AR_PHY_TEST_RX_OBS_SEL_BIT5);
+ REG_RMW_FIELD(ah, AR_PHY_TEST_CTL_STATUS, AR_PHY_TEST_CTL_RX_OBS_SEL, 0);
+
+ memset(buf, 0, len);
+ for (i = 0; i < len; i++) {
+ for (j = 0; j < 4; j++) {
+ u32 regval = REG_READ(ah, AR_PHY_TST_ADC);
+
+ buf[i] <<= 2;
+ buf[i] |= (regval & 1) | ((regval & BIT(10)) >> 9);
+ udelay(1);
+ }
+ }
+}
+
void ar9003_hw_attach_phy_ops(struct ath_hw *ah)
{
struct ath_hw_private_ops *priv_ops = ath9k_hw_private_ops(ah);
@@ -1639,6 +1659,7 @@ void ar9003_hw_attach_phy_ops(struct ath
priv_ops->set_radar_params = ar9003_hw_set_radar_params;
priv_ops->fast_chan_change = ar9003_hw_fast_chan_change;
+ ops->get_adc_entropy = ar9003_hw_get_adc_entropy;
ops->antdiv_comb_conf_get = ar9003_hw_antdiv_comb_conf_get;
ops->antdiv_comb_conf_set = ar9003_hw_antdiv_comb_conf_set;
ops->spectral_scan_config = ar9003_hw_spectral_scan_config;
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -794,7 +794,8 @@ static void ath9k_init_txpower_limits(st
if (ah->caps.hw_caps & ATH9K_HW_CAP_5GHZ)
ath9k_init_band_txpower(sc, IEEE80211_BAND_5GHZ);
- ah->curchan = curchan;
+ if (curchan)
+ ah->curchan = curchan;
}
void ath9k_reload_chainmask_settings(struct ath_softc *sc)
@@ -940,6 +941,18 @@ void ath9k_set_hw_capab(struct ath_softc
SET_IEEE80211_PERM_ADDR(hw, common->macaddr);
}
+static void ath_get_initial_entropy(struct ath_softc *sc)
+{
+ struct ath_hw *ah = sc->sc_ah;
+ char buf[256];
+
+ /* reuse last channel initialized by the tx power test */
+ ath9k_hw_reset(ah, ah->curchan, NULL, false);
+
+ ath9k_hw_get_adc_entropy(ah, buf, sizeof(buf));
+ add_device_randomness(buf, sizeof(buf));
+}
+
int ath9k_init_device(u16 devid, struct ath_softc *sc,
const struct ath_bus_ops *bus_ops)
{
@@ -985,6 +998,8 @@ int ath9k_init_device(u16 devid, struct
ARRAY_SIZE(ath9k_tpt_blink));
#endif
+ ath_get_initial_entropy(sc);
+
/* Register with mac80211 */
error = ieee80211_register_hw(hw);
if (error)
--- a/drivers/net/wireless/ath/ath9k/hw-ops.h
+++ b/drivers/net/wireless/ath/ath9k/hw-ops.h
@@ -78,6 +78,12 @@ static inline void ath9k_hw_antdiv_comb_
ath9k_hw_ops(ah)->antdiv_comb_conf_set(ah, antconf);
}
+static inline void ath9k_hw_get_adc_entropy(struct ath_hw *ah,
+ u8 *buf, size_t len)
+{
+ ath9k_hw_ops(ah)->get_adc_entropy(ah, buf, len);
+}
+
#ifdef CPTCFG_ATH9K_BTCOEX_SUPPORT
static inline void ath9k_hw_set_bt_ant_diversity(struct ath_hw *ah, bool enable)
--- a/drivers/net/wireless/ath/ath9k/link.c
+++ b/drivers/net/wireless/ath/ath9k/link.c
@@ -342,6 +342,11 @@ void ath_ani_calibrate(unsigned long dat
unsigned int timestamp = jiffies_to_msecs(jiffies);
u32 cal_interval, short_cal_interval, long_cal_interval;
unsigned long flags;
+ char buf[256];
+
+ /* gather entropy */
+ ath9k_hw_get_adc_entropy(ah, buf, sizeof(buf));
+ add_device_randomness(buf, sizeof(buf));
if (ah->caldata && ah->caldata->nfcal_interference)
long_cal_interval = ATH_LONG_CALINTERVAL_INT;
--- a/drivers/net/wireless/ath/ath9k/ar5008_phy.c
+++ b/drivers/net/wireless/ath/ath9k/ar5008_phy.c
@@ -1299,9 +1299,30 @@ static void ar5008_hw_set_radar_conf(str
conf->radar_inband = 8;
}
+static void ar5008_hw_get_adc_entropy(struct ath_hw *ah, u8 *buf, size_t len)
+{
+ int i, j;
+
+ REG_RMW_FIELD(ah, AR_PHY_TEST, AR_PHY_TEST_BBB_OBS_SEL, 1);
+ REG_CLR_BIT(ah, AR_PHY_TEST, AR_PHY_TEST_RX_OBS_SEL_BIT5);
+ REG_RMW_FIELD(ah, AR_PHY_TEST2, AR_PHY_TEST2_RX_OBS_SEL, 0);
+
+ memset(buf, 0, len);
+ for (i = 0; i < len; i++) {
+ for (j = 0; j < 4; j++) {
+ u32 regval = REG_READ(ah, AR_PHY_TST_ADC);
+
+ buf[i] <<= 2;
+ buf[i] |= (regval & 1) | ((regval & BIT(9)) >> 8);
+ udelay(1);
+ }
+ }
+}
+
int ar5008_hw_attach_phy_ops(struct ath_hw *ah)
{
struct ath_hw_private_ops *priv_ops = ath9k_hw_private_ops(ah);
+ struct ath_hw_ops *ops = ath9k_hw_ops(ah);
static const u32 ar5416_cca_regs[6] = {
AR_PHY_CCA,
AR_PHY_CH1_CCA,
@@ -1316,6 +1337,8 @@ int ar5008_hw_attach_phy_ops(struct ath_
if (ret)
return ret;
+ ops->get_adc_entropy = ar5008_hw_get_adc_entropy;
+
priv_ops->rf_set_freq = ar5008_hw_set_channel;
priv_ops->spur_mitigate_freq = ar5008_hw_spur_mitigate;
--- a/drivers/net/wireless/ath/ath9k/ar9002_phy.h
+++ b/drivers/net/wireless/ath/ath9k/ar9002_phy.h
@@ -20,6 +20,12 @@
#define PHY_AGC_CLR 0x10000000
#define RFSILENT_BB 0x00002000
+#define AR_PHY_TEST_BBB_OBS_SEL 0x780000
+#define AR_PHY_TEST_BBB_OBS_SEL_S 19
+
+#define AR_PHY_TEST_RX_OBS_SEL_BIT5_S 23
+#define AR_PHY_TEST_RX_OBS_SEL_BIT5 (1 << AR_PHY_TEST_RX_OBS_SEL_BIT5_S)
+
#define AR_PHY_TURBO 0x9804
#define AR_PHY_FC_TURBO_MODE 0x00000001
#define AR_PHY_FC_TURBO_SHORT 0x00000002
@@ -36,6 +42,9 @@
#define AR_PHY_TEST2 0x9808
+#define AR_PHY_TEST2_RX_OBS_SEL 0x3C00
+#define AR_PHY_TEST2_RX_OBS_SEL_S 10
+
#define AR_PHY_TIMING2 0x9810
#define AR_PHY_TIMING3 0x9814
#define AR_PHY_TIMING3_DSC_MAN 0xFFFE0000
@@ -390,6 +399,8 @@
#define AR_PHY_RFBUS_GRANT 0x9C20
#define AR_PHY_RFBUS_GRANT_EN 0x00000001
+#define AR_PHY_TST_ADC 0x9C24
+
#define AR_PHY_CHAN_INFO_GAIN_DIFF 0x9CF4
#define AR_PHY_CHAN_INFO_GAIN_DIFF_UPPER_LIMIT 320