[RFC 31/32] ath9k: add external_reset callback to ath9k_platfom_data for AR9330
From: Gabor Juhos <hidden>
Date: 2011-05-31 19:47:48
Subsystem:
atheros ath generic utilities, qualcomm atheros ath9k wireless driver, the rest · Maintainers:
Jeff Johnson, Toke Høiland-Jørgensen, Linus Torvalds
The patch adds a callback to ath9k_platform_data. If the callback is provided by the platform code, then it can be used to hard reset the WMAC device. The callback is required for doing a hard reset of the AR9330 chips to get them working again after a hang. Signed-off-by: Gabor Juhos <redacted> --- drivers/net/wireless/ath/ath9k/hw.c | 35 +++++++++++++++++++++++++++++++++ drivers/net/wireless/ath/ath9k/hw.h | 1 + drivers/net/wireless/ath/ath9k/init.c | 1 + include/linux/ath9k_platform.h | 1 + 4 files changed, 38 insertions(+), 0 deletions(-)
diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 323b6ab..5d373fc 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c@@ -1161,6 +1161,41 @@ static bool ath9k_hw_set_reset(struct ath_hw *ah, int type) rst_flags |= AR_RTC_RC_MAC_COLD; } + if (AR_SREV_9330(ah)) { + int npend = 0; + int i; + + /* AR9330 WAR: + * call external reset function to reset WMAC if: + * - doing a cold reset + * - we have pending frames in the TX queues + */ + + for (i = 0; i < AR_NUM_QCU; i++) { + npend = ath9k_hw_numtxpending(ah, i); + if (npend) + break; + } + + if (ah->external_reset && + (npend || type == ATH9K_RESET_COLD)) { + int reset_err = 0; + + ath_dbg(ath9k_hw_common(ah), ATH_DBG_RESET, + "reset MAC via external reset\n"); + + reset_err = ah->external_reset(); + if (reset_err) { + ath_err(ath9k_hw_common(ah), + "External reset failed, err=%d\n", + reset_err); + return false; + } + + REG_WRITE(ah, AR_RTC_RESET, 1); + } + } + REG_WRITE(ah, AR_RTC_RC, rst_flags); REGWRITE_BUFFER_FLUSH(ah);
diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h
index 8d9ac49..f29a806 100644
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h@@ -864,6 +864,7 @@ struct ath_hw { bool is_clk_25mhz; int (*get_mac_revision)(void); + int (*external_reset)(void); }; struct ath_bus_ops {
diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
index 5ffabb9..f517649 100644
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c@@ -576,6 +576,7 @@ static int ath9k_init_softc(u16 devid, struct ath_softc *sc, u16 subsysid, sc->sc_ah->led_pin = pdata->led_pin; ah->is_clk_25mhz = pdata->is_clk_25mhz; ah->get_mac_revision = pdata->get_mac_revision; + ah->external_reset = pdata->external_reset; } common = ath9k_hw_common(ah);
diff --git a/include/linux/ath9k_platform.h b/include/linux/ath9k_platform.h
index c207607..6e3f54f 100644
--- a/include/linux/ath9k_platform.h
+++ b/include/linux/ath9k_platform.h@@ -31,6 +31,7 @@ struct ath9k_platform_data { bool is_clk_25mhz; int (*get_mac_revision)(void); + int (*external_reset)(void); }; #endif /* _LINUX_ATH9K_PLATFORM_H */
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1.7.2.1