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ath9k: Identify baseband watchdog signatures 

A full HW reset is not required for all baseband watchdog
signatures. Some BB watchdog updates are benign and can
be discarded, some require re-programming of certain registers
and others require a chip reset.

This patch adds a routine to identify such signatures.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Sujith Manoharan 2013-12-24 10:44:23 +05:30 committed by John W. Linville
parent a6bb860be4
commit d88527d3d3
3 changed files with 65 additions and 0 deletions
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62
drivers/net/wireless/ath/ath9k/ar9003_phy.c
View File

@ -1814,6 +1814,68 @@ void ar9003_hw_attach_phy_ops(struct ath_hw *ah)
memcpy(ah->nf_regs, ar9300_cca_regs, sizeof(ah->nf_regs));
}
/*
* Baseband Watchdog signatures:
*
* 0x04000539: BB hang when operating in HT40 DFS Channel.
* Full chip reset is not required, but a recovery
* mechanism is needed.
*
* 0x1300000a: Related to CAC deafness.
* Chip reset is not required.
*
* 0x0400000a: Related to CAC deafness.
* Full chip reset is required.
*
* 0x04000b09: RX state machine gets into an illegal state
* when a packet with unsupported rate is received.
* Full chip reset is required and PHY_RESTART has
* to be disabled.
*
* 0x04000409: Packet stuck on receive.
* Full chip reset is required for all chips except AR9340.
*/
/*
* ar9003_hw_bb_watchdog_check(): Returns true if a chip reset is required.
*/
bool ar9003_hw_bb_watchdog_check(struct ath_hw *ah)
{
u32 val;
switch(ah->bb_watchdog_last_status) {
case 0x04000539:
val = REG_READ(ah, AR_PHY_RADAR_0);
val &= (~AR_PHY_RADAR_0_FIRPWR);
val |= SM(0x7f, AR_PHY_RADAR_0_FIRPWR);
REG_WRITE(ah, AR_PHY_RADAR_0, val);
udelay(1);
val = REG_READ(ah, AR_PHY_RADAR_0);
val &= ~AR_PHY_RADAR_0_FIRPWR;
val |= SM(AR9300_DFS_FIRPWR, AR_PHY_RADAR_0_FIRPWR);
REG_WRITE(ah, AR_PHY_RADAR_0, val);
return false;
case 0x1300000a:
return false;
case 0x0400000a:
case 0x04000b09:
return true;
case 0x04000409:
if (AR_SREV_9340(ah))
return false;
else
return true;
default:
/*
* For any other unknown signatures, do a
* full chip reset.
*/
return true;
}
}
EXPORT_SYMBOL(ar9003_hw_bb_watchdog_check);
void ar9003_hw_bb_watchdog_config(struct ath_hw *ah)
{
struct ath_common *common = ath9k_hw_common(ah);

2
drivers/net/wireless/ath/ath9k/ar9003_phy.h
View File

@ -1334,4 +1334,6 @@
#define AR_PHY_65NM_RXRF_AGC_AGC_OUT 0x00000004
#define AR_PHY_65NM_RXRF_AGC_AGC_OUT_S 2
#define AR9300_DFS_FIRPWR -28
#endif /* AR9003_PHY_H */

1
drivers/net/wireless/ath/ath9k/hw.h
View File

@ -1044,6 +1044,7 @@ void ar9002_hw_enable_async_fifo(struct ath_hw *ah);
* Code specific to AR9003, we stuff these here to avoid callbacks
* for older families
*/
bool ar9003_hw_bb_watchdog_check(struct ath_hw *ah);
void ar9003_hw_bb_watchdog_config(struct ath_hw *ah);
void ar9003_hw_bb_watchdog_read(struct ath_hw *ah);
void ar9003_hw_bb_watchdog_dbg_info(struct ath_hw *ah);