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ath5k: use the common cycle counter / listen time implementation

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Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Felix Fietkau
2010-10-08 22:13:54 +02:00
committed by John W. Linville
parent b5bfc5683d
commit 7109ca5c80
3 changed files with 24 additions and 39 deletions
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37
drivers/net/wireless/ath/ath5k/ani.c
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@@ -355,41 +355,28 @@ ath5k_ani_lower_immunity(struct ath5k_hw *ah, struct ath5k_ani_state *as)
/**
* ath5k_hw_ani_get_listen_time() - Calculate time spent listening
* ath5k_hw_ani_get_listen_time() - Update counters and return listening time
*
* Return an approximation of the time spent "listening" in milliseconds (ms)
* since the last call of this function by deducting the cycles spent
* transmitting and receiving from the total cycle count.
* Save profile count values for debugging/statistics and because we might want
* to use them later.
*
* We assume no one else clears these registers!
* since the last call of this function.
* Save a snapshot of the counter values for debugging/statistics.
*/
static int
ath5k_hw_ani_get_listen_time(struct ath5k_hw *ah, struct ath5k_ani_state *as)
{
struct ath_common *common = ath5k_hw_common(ah);
int listen;
/* freeze */
ath5k_hw_reg_write(ah, AR5K_MIBC_FMC, AR5K_MIBC);
/* read */
as->pfc_cycles = ath5k_hw_reg_read(ah, AR5K_PROFCNT_CYCLE);
as->pfc_busy = ath5k_hw_reg_read(ah, AR5K_PROFCNT_RXCLR);
as->pfc_tx = ath5k_hw_reg_read(ah, AR5K_PROFCNT_TX);
as->pfc_rx = ath5k_hw_reg_read(ah, AR5K_PROFCNT_RX);
/* clear */
ath5k_hw_reg_write(ah, 0, AR5K_PROFCNT_TX);
ath5k_hw_reg_write(ah, 0, AR5K_PROFCNT_RX);
ath5k_hw_reg_write(ah, 0, AR5K_PROFCNT_RXCLR);
ath5k_hw_reg_write(ah, 0, AR5K_PROFCNT_CYCLE);
/* un-freeze */
ath5k_hw_reg_write(ah, 0, AR5K_MIBC);
spin_lock_bh(&common->cc_lock);
/* TODO: where does 44000 come from? (11g clock rate?) */
listen = (as->pfc_cycles - as->pfc_rx - as->pfc_tx) / 44000;
ath_hw_cycle_counters_update(common);
memcpy(&as->last_cc, &common->cc_ani, sizeof(as->last_cc));
/* clears common->cc_ani */
listen = ath_hw_get_listen_time(common);
spin_unlock_bh(&common->cc_lock);
if (as->pfc_cycles == 0 || listen < 0)
return 0;
return listen;
}