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ath9k: merge noisefloor load implementations

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AR5008+ and AR9003 currently use two separate implementations of the
ath9k_hw_loadnf function. There are three main differences:

 - PHY registers for AR9003 are different
 - AR9003 always uses 3 chains, earlier versions are more selective
 - The AR9003 variant contains a fix for NF load timeouts

This patch merges the two implementations into one, storing the
register array in the ath_hw struct. The fix for NF load timeouts is
not just relevant for AR9003, but also important for earlier hardware,
so it's better to just keep one common implementation.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Felix Fietkau
2010-07-11 15:44:42 +02:00
committed by John W. Linville
parent b11b160def
commit bbacee13f4
6 changed files with 114 additions and 181 deletions
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94
drivers/net/wireless/ath/ath9k/calib.c
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@@ -167,6 +167,100 @@ void ath9k_hw_start_nfcal(struct ath_hw *ah)
REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
}
void ath9k_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan)
{
struct ath9k_nfcal_hist *h;
unsigned i, j;
int32_t val;
u8 chainmask;
struct ath_common *common = ath9k_hw_common(ah);
if (AR_SREV_9300_20_OR_LATER(ah))
chainmask = 0x3F;
else if (AR_SREV_9285(ah) || AR_SREV_9271(ah))
chainmask = 0x9;
else if (AR_SREV_9280(ah) || AR_SREV_9287(ah)) {
if ((ah->rxchainmask & 0x2) || (ah->rxchainmask & 0x4))
chainmask = 0x1B;
else
chainmask = 0x09;
} else {
if (ah->rxchainmask & 0x4)
chainmask = 0x3F;
else if (ah->rxchainmask & 0x2)
chainmask = 0x1B;
else
chainmask = 0x09;
}
h = ah->nfCalHist;
for (i = 0; i < NUM_NF_READINGS; i++) {
if (chainmask & (1 << i)) {
val = REG_READ(ah, ah->nf_regs[i]);
val &= 0xFFFFFE00;
val |= (((u32) (h[i].privNF) << 1) & 0x1ff);
REG_WRITE(ah, ah->nf_regs[i], val);
}
}
/*
* Load software filtered NF value into baseband internal minCCApwr
* variable.
*/
REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL,
AR_PHY_AGC_CONTROL_ENABLE_NF);
REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL,
AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
/*
* Wait for load to complete, should be fast, a few 10s of us.
* The max delay was changed from an original 250us to 10000us
* since 250us often results in NF load timeout and causes deaf
* condition during stress testing 12/12/2009
*/
for (j = 0; j < 1000; j++) {
if ((REG_READ(ah, AR_PHY_AGC_CONTROL) &
AR_PHY_AGC_CONTROL_NF) == 0)
break;
udelay(10);
}
/*
* We timed out waiting for the noisefloor to load, probably due to an
* in-progress rx. Simply return here and allow the load plenty of time
* to complete before the next calibration interval. We need to avoid
* trying to load -50 (which happens below) while the previous load is
* still in progress as this can cause rx deafness. Instead by returning
* here, the baseband nf cal will just be capped by our present
* noisefloor until the next calibration timer.
*/
if (j == 1000) {
ath_print(common, ATH_DBG_ANY, "Timeout while waiting for nf "
"to load: AR_PHY_AGC_CONTROL=0x%x\n",
REG_READ(ah, AR_PHY_AGC_CONTROL));
return;
}
/*
* Restore maxCCAPower register parameter again so that we're not capped
* by the median we just loaded. This will be initial (and max) value
* of next noise floor calibration the baseband does.
*/
ENABLE_REGWRITE_BUFFER(ah);
for (i = 0; i < NUM_NF_READINGS; i++) {
if (chainmask & (1 << i)) {
val = REG_READ(ah, ah->nf_regs[i]);
val &= 0xFFFFFE00;
val |= (((u32) (-50) << 1) & 0x1ff);
REG_WRITE(ah, ah->nf_regs[i], val);
}
}
REGWRITE_BUFFER_FLUSH(ah);
DISABLE_REGWRITE_BUFFER(ah);
}
static void ath9k_hw_nf_sanitize(struct ath_hw *ah, s16 *nf)
{
struct ath_common *common = ath9k_hw_common(ah);