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ath9k: export HW random number generator
We measured the FFT-based entropy in 3 ways, Shannon entropy, collision entropy, and directly measured min-entropy. Just to be conservative, we recommend the estimated min-Entropy to be 10 bits per 16-bit value. Analysis was done by Jacobson,David(djacobso@qti.qualcomm.com). Signed-off-by: Miaoqing Pan <miaoqing@qca.qualcomm.com> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
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Miaoqing Pan
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Kalle Valo
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Jul 21, 2015
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/* | ||
* Copyright (c) 2015 Qualcomm Atheros, Inc. | ||
* | ||
* Permission to use, copy, modify, and/or distribute this software for any | ||
* purpose with or without fee is hereby granted, provided that the above | ||
* copyright notice and this permission notice appear in all copies. | ||
* | ||
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | ||
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | ||
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | ||
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | ||
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | ||
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | ||
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | ||
*/ | ||
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#include "ath9k.h" | ||
#include "hw.h" | ||
#include "ar9003_phy.h" | ||
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static int ath9k_rng_data_read(struct hwrng *rng, u32 *data) | ||
{ | ||
u32 v1, v2; | ||
struct ath_softc *sc = (struct ath_softc *)rng->priv; | ||
struct ath_hw *ah = sc->sc_ah; | ||
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ath9k_ps_wakeup(sc); | ||
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REG_RMW_FIELD(ah, AR_PHY_TEST, AR_PHY_TEST_BBB_OBS_SEL, 5); | ||
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); | ||
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v1 = REG_READ(ah, AR_PHY_TST_ADC); | ||
v2 = REG_READ(ah, AR_PHY_TST_ADC); | ||
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ath9k_ps_restore(sc); | ||
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/* wait for data ready */ | ||
if (v1 && v2 && sc->rng_last != v1 && v1 != v2) { | ||
*data = (v1 & 0xffff) | (v2 << 16); | ||
sc->rng_last = v2; | ||
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return sizeof(u32); | ||
} | ||
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sc->rng_last = v2; | ||
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return 0; | ||
} | ||
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void ath9k_rng_register(struct ath_softc *sc) | ||
{ | ||
struct ath_hw *ah = sc->sc_ah; | ||
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if (WARN_ON(sc->rng_initialized)) | ||
return; | ||
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if (!AR_SREV_9300_20_OR_LATER(ah)) | ||
return; | ||
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sc->rng.name = "ath9k"; | ||
sc->rng.data_read = ath9k_rng_data_read; | ||
sc->rng.priv = (unsigned long)sc; | ||
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if (!hwrng_register(&sc->rng)) | ||
sc->rng_initialized = true; | ||
} | ||
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void ath9k_rng_unregister(struct ath_softc *sc) | ||
{ | ||
if (sc->rng_initialized) { | ||
hwrng_unregister(&sc->rng); | ||
sc->rng_initialized = false; | ||
} | ||
} |