ath9k_hw: add a new API for setting tx descriptors

Instead of using lots of different functions with long argument lists,
pull all the necessary information from one struct. This makes the code
easier to read and eliminates the need for copying data between multiple
linked descriptors.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 127 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/ar9003_mac.c b/drivers/net/wireless/ath/ath9k/ar9003_mac.c
index c3179d9bdc38..e3382d5013c5 100644
--- a/drivers/net/wireless/ath/ath9k/ar9003_mac.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_mac.c
@@ -21,6 +21,132 @@ static void ar9003_hw_rx_enable(struct ath_hw *hw)
 	REG_WRITE(hw, AR_CR, 0);
 }
 
+static void
+ar9003_set_txdesc(struct ath_hw *ah, void *ds, struct ath_tx_info *i)
+{
+	struct ar9003_txc *ads = ds;
+	int checksum = 0;
+	u32 val, ctl12, ctl17;
+
+	val = (ATHEROS_VENDOR_ID << AR_DescId_S) |
+	      (1 << AR_TxRxDesc_S) |
+	      (1 << AR_CtrlStat_S) |
+	      (i->qcu << AR_TxQcuNum_S) | 0x17;
+
+	checksum += val;
+	ACCESS_ONCE(ads->info) = val;
+
+	checksum += i->link;
+	ACCESS_ONCE(ads->link) = i->link;
+
+	checksum += i->buf_addr[0];
+	ACCESS_ONCE(ads->data0) = i->buf_addr[0];
+	checksum += i->buf_addr[1];
+	ACCESS_ONCE(ads->data1) = i->buf_addr[1];
+	checksum += i->buf_addr[2];
+	ACCESS_ONCE(ads->data2) = i->buf_addr[2];
+	checksum += i->buf_addr[3];
+	ACCESS_ONCE(ads->data3) = i->buf_addr[3];
+
+	checksum += (val = (i->buf_len[0] << AR_BufLen_S) & AR_BufLen);
+	ACCESS_ONCE(ads->ctl3) = val;
+	checksum += (val = (i->buf_len[1] << AR_BufLen_S) & AR_BufLen);
+	ACCESS_ONCE(ads->ctl5) = val;
+	checksum += (val = (i->buf_len[2] << AR_BufLen_S) & AR_BufLen);
+	ACCESS_ONCE(ads->ctl7) = val;
+	checksum += (val = (i->buf_len[3] << AR_BufLen_S) & AR_BufLen);
+	ACCESS_ONCE(ads->ctl9) = val;
+
+	checksum = (u16) (((checksum & 0xffff) + (checksum >> 16)) & 0xffff);
+	ACCESS_ONCE(ads->ctl10) = checksum;
+
+	if (i->is_first || i->is_last) {
+		ACCESS_ONCE(ads->ctl13) = set11nTries(i->rates, 0)
+			| set11nTries(i->rates, 1)
+			| set11nTries(i->rates, 2)
+			| set11nTries(i->rates, 3)
+			| (i->dur_update ? AR_DurUpdateEna : 0)
+			| SM(0, AR_BurstDur);
+
+		ACCESS_ONCE(ads->ctl14) = set11nRate(i->rates, 0)
+			| set11nRate(i->rates, 1)
+			| set11nRate(i->rates, 2)
+			| set11nRate(i->rates, 3);
+	} else {
+		ACCESS_ONCE(ads->ctl13) = 0;
+		ACCESS_ONCE(ads->ctl14) = 0;
+	}
+
+	ads->ctl20 = 0;
+	ads->ctl21 = 0;
+	ads->ctl22 = 0;
+
+	ctl17 = SM(i->keytype, AR_EncrType);
+	if (!i->is_first) {
+		ACCESS_ONCE(ads->ctl11) = 0;
+		ACCESS_ONCE(ads->ctl12) = i->is_last ? 0 : AR_TxMore;
+		ACCESS_ONCE(ads->ctl15) = 0;
+		ACCESS_ONCE(ads->ctl16) = 0;
+		ACCESS_ONCE(ads->ctl17) = ctl17;
+		ACCESS_ONCE(ads->ctl18) = 0;
+		ACCESS_ONCE(ads->ctl19) = 0;
+		return;
+	}
+
+	ACCESS_ONCE(ads->ctl11) = (i->pkt_len & AR_FrameLen)
+		| (i->flags & ATH9K_TXDESC_VMF ? AR_VirtMoreFrag : 0)
+		| SM(i->txpower, AR_XmitPower)
+		| (i->flags & ATH9K_TXDESC_VEOL ? AR_VEOL : 0)
+		| (i->keyix != ATH9K_TXKEYIX_INVALID ? AR_DestIdxValid : 0)
+		| (i->flags & ATH9K_TXDESC_LOWRXCHAIN ? AR_LowRxChain : 0)
+		| (i->flags & ATH9K_TXDESC_CLRDMASK ? AR_ClrDestMask : 0)
+		| (i->flags & ATH9K_TXDESC_RTSENA ? AR_RTSEnable :
+		   (i->flags & ATH9K_TXDESC_CTSENA ? AR_CTSEnable : 0));
+
+	ctl12 = (i->keyix != ATH9K_TXKEYIX_INVALID ?
+		 SM(i->keyix, AR_DestIdx) : 0)
+		| SM(i->type, AR_FrameType)
+		| (i->flags & ATH9K_TXDESC_NOACK ? AR_NoAck : 0)
+		| (i->flags & ATH9K_TXDESC_EXT_ONLY ? AR_ExtOnly : 0)
+		| (i->flags & ATH9K_TXDESC_EXT_AND_CTL ? AR_ExtAndCtl : 0);
+
+	ctl17 |= (i->flags & ATH9K_TXDESC_LDPC ? AR_LDPC : 0);
+	switch (i->aggr) {
+	case AGGR_BUF_FIRST:
+		ctl17 |= SM(i->aggr_len, AR_AggrLen);
+		/* fall through */
+	case AGGR_BUF_MIDDLE:
+		ctl12 |= AR_IsAggr | AR_MoreAggr;
+		ctl17 |= SM(i->ndelim, AR_PadDelim);
+		break;
+	case AGGR_BUF_LAST:
+		ctl12 |= AR_IsAggr;
+		break;
+	case AGGR_BUF_NONE:
+		break;
+	}
+
+	val = (i->flags & ATH9K_TXDESC_PAPRD) >> ATH9K_TXDESC_PAPRD_S;
+	ctl12 |= SM(val, AR_PAPRDChainMask);
+
+	ACCESS_ONCE(ads->ctl12) = ctl12;
+	ACCESS_ONCE(ads->ctl17) = ctl17;
+
+	ACCESS_ONCE(ads->ctl15) = set11nPktDurRTSCTS(i->rates, 0)
+		| set11nPktDurRTSCTS(i->rates, 1);
+
+	ACCESS_ONCE(ads->ctl16) = set11nPktDurRTSCTS(i->rates, 2)
+		| set11nPktDurRTSCTS(i->rates, 3);
+
+	ACCESS_ONCE(ads->ctl18) = set11nRateFlags(i->rates, 0)
+		| set11nRateFlags(i->rates, 1)
+		| set11nRateFlags(i->rates, 2)
+		| set11nRateFlags(i->rates, 3)
+		| SM(i->rtscts_rate, AR_RTSCTSRate);
+
+	ACCESS_ONCE(ads->ctl19) = AR_Not_Sounding;
+}
+
 static u16 ar9003_calc_ptr_chksum(struct ar9003_txc *ads)
 {
 	int checksum;
@@ -471,6 +597,7 @@ void ar9003_hw_attach_mac_ops(struct ath_hw *hw)
 	ops->rx_enable = ar9003_hw_rx_enable;
 	ops->set_desc_link = ar9003_hw_set_desc_link;
 	ops->get_isr = ar9003_hw_get_isr;
+	ops->set_txdesc = ar9003_set_txdesc;
 	ops->fill_txdesc = ar9003_hw_fill_txdesc;
 	ops->proc_txdesc = ar9003_hw_proc_txdesc;
 	ops->set11n_txdesc = ar9003_hw_set11n_txdesc;