b43: N-PHY: add RX IQ calibrationi for rev < 3

Signed-off-by: NRafał Miłecki <zajec5@gmail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/b43/phy_n.c

@@ -1660,6 +1660,206 @@ static int b43_nphy_cal_tx_iq_lo(struct b43_wldev *dev,
 	return error;
 }
 
+/* http://bcm-v4.sipsolutions.net/802.11/PHY/N/CalRxIqRev2 */
+static int b43_nphy_rev2_cal_rx_iq(struct b43_wldev *dev,
+			struct nphy_txgains target, u8 type, bool debug)
+{
+	struct b43_phy_n *nphy = dev->phy.n;
+	int i, j, index;
+	u8 rfctl[2];
+	u8 afectl_core;
+	u16 tmp[6];
+	u16 cur_hpf1, cur_hpf2, cur_lna;
+	u32 real, imag;
+	enum ieee80211_band band;
+
+	u8 use;
+	u16 cur_hpf;
+	u16 lna[3] = { 3, 3, 1 };
+	u16 hpf1[3] = { 7, 2, 0 };
+	u16 hpf2[3] = { 2, 0, 0 };
+	u32 power[3];
+	u16 gain_save[2];
+	u16 cal_gain[2];
+	struct nphy_iqcal_params cal_params[2];
+	struct nphy_iq_est est;
+	int ret = 0;
+	bool playtone = true;
+	int desired = 13;
+
+	b43_nphy_stay_in_carrier_search(dev, 1);
+
+	if (dev->phy.rev < 2)
+		;/* TODO: Call N PHY Reapply TX Cal Coeffs */
+	/* TODO: Read an N PHY Table with ID 7, length 2, offset 0x110,
+		width 16, and data gain_save */
+	for (i = 0; i < 2; i++) {
+		b43_nphy_iq_cal_gain_params(dev, i, target, &cal_params[i]);
+		cal_gain[i] = cal_params[i].cal_gain;
+	}
+	/* TODO: Write an N PHY Table with ID 7, length 2, offset 0x110,
+		width 16, and data from cal_gain */
+
+	for (i = 0; i < 2; i++) {
+		if (i == 0) {
+			rfctl[0] = B43_NPHY_RFCTL_INTC1;
+			rfctl[1] = B43_NPHY_RFCTL_INTC2;
+			afectl_core = B43_NPHY_AFECTL_C1;
+		} else {
+			rfctl[0] = B43_NPHY_RFCTL_INTC2;
+			rfctl[1] = B43_NPHY_RFCTL_INTC1;
+			afectl_core = B43_NPHY_AFECTL_C2;
+		}
+
+		tmp[1] = b43_phy_read(dev, B43_NPHY_RFSEQCA);
+		tmp[2] = b43_phy_read(dev, afectl_core);
+		tmp[3] = b43_phy_read(dev, B43_NPHY_AFECTL_OVER);
+		tmp[4] = b43_phy_read(dev, rfctl[0]);
+		tmp[5] = b43_phy_read(dev, rfctl[1]);
+
+		b43_phy_maskset(dev, B43_NPHY_RFSEQCA,
+				(u16)~B43_NPHY_RFSEQCA_RXDIS,
+				((1 - i) << B43_NPHY_RFSEQCA_RXDIS_SHIFT));
+		b43_phy_maskset(dev, B43_NPHY_RFSEQCA, ~B43_NPHY_RFSEQCA_TXEN,
+				(1 - i));
+		b43_phy_set(dev, afectl_core, 0x0006);
+		b43_phy_set(dev, B43_NPHY_AFECTL_OVER, 0x0006);
+
+		band = b43_current_band(dev->wl);
+
+		if (nphy->rxcalparams & 0xFF000000) {
+			if (band == IEEE80211_BAND_5GHZ)
+				b43_phy_write(dev, rfctl[0], 0x140);
+			else
+				b43_phy_write(dev, rfctl[0], 0x110);
+		} else {
+			if (band == IEEE80211_BAND_5GHZ)
+				b43_phy_write(dev, rfctl[0], 0x180);
+			else
+				b43_phy_write(dev, rfctl[0], 0x120);
+		}
+
+		if (band == IEEE80211_BAND_5GHZ)
+			b43_phy_write(dev, rfctl[1], 0x148);
+		else
+			b43_phy_write(dev, rfctl[1], 0x114);
+
+		if (nphy->rxcalparams & 0x10000) {
+			b43_radio_maskset(dev, B2055_C1_GENSPARE2, 0xFC,
+					(i + 1));
+			b43_radio_maskset(dev, B2055_C2_GENSPARE2, 0xFC,
+					(2 - i));
+		}
+
+		for (j = 0; i < 4; j++) {
+			if (j < 3) {
+				cur_lna = lna[j];
+				cur_hpf1 = hpf1[j];
+				cur_hpf2 = hpf2[j];
+			} else {
+				if (power[1] > 10000) {
+					use = 1;
+					cur_hpf = cur_hpf1;
+					index = 2;
+				} else {
+					if (power[0] > 10000) {
+						use = 1;
+						cur_hpf = cur_hpf1;
+						index = 1;
+					} else {
+						index = 0;
+						use = 2;
+						cur_hpf = cur_hpf2;
+					}
+				}
+				cur_lna = lna[index];
+				cur_hpf1 = hpf1[index];
+				cur_hpf2 = hpf2[index];
+				cur_hpf += desired - hweight32(power[index]);
+				cur_hpf = clamp_val(cur_hpf, 0, 10);
+				if (use == 1)
+					cur_hpf1 = cur_hpf;
+				else
+					cur_hpf2 = cur_hpf;
+			}
+
+			tmp[0] = ((cur_hpf2 << 8) | (cur_hpf1 << 4) |
+					(cur_lna << 2));
+			/* TODO:Call N PHY RF Ctrl Override with 0x400, tmp[0],
+				3, 0 as arguments */
+			/* TODO: Call N PHY Force RF Seq with 2 as argument */
+			/* TODO: Call N PHT Stop Playback */
+
+			if (playtone) {
+				/* TODO: Call N PHY TX Tone with 4000,
+					(nphy_rxcalparams & 0xffff), 0, 0
+					as arguments and save result as ret */
+				playtone = false;
+			} else {
+				/* TODO: Call N PHY Run Samples with 160,
+					0xFFFF, 0, 0, 0 as arguments */
+			}
+
+			if (ret == 0) {
+				if (j < 3) {
+					b43_nphy_rx_iq_est(dev, &est, 1024, 32,
+									false);
+					if (i == 0) {
+						real = est.i0_pwr;
+						imag = est.q0_pwr;
+					} else {
+						real = est.i1_pwr;
+						imag = est.q1_pwr;
+					}
+					power[i] = ((real + imag) / 1024) + 1;
+				} else {
+					b43_nphy_calc_rx_iq_comp(dev, 1 << i);
+				}
+				/* TODO: Call N PHY Stop Playback */
+			}
+
+			if (ret != 0)
+				break;
+		}
+
+		b43_radio_mask(dev, B2055_C1_GENSPARE2, 0xFC);
+		b43_radio_mask(dev, B2055_C2_GENSPARE2, 0xFC);
+		b43_phy_write(dev, rfctl[1], tmp[5]);
+		b43_phy_write(dev, rfctl[0], tmp[4]);
+		b43_phy_write(dev, B43_NPHY_AFECTL_OVER, tmp[3]);
+		b43_phy_write(dev, afectl_core, tmp[2]);
+		b43_phy_write(dev, B43_NPHY_RFSEQCA, tmp[1]);
+
+		if (ret != 0)
+			break;
+	}
+
+	/* TODO: Call N PHY RF Ctrl Override with 0x400, 0, 3, 1 as arguments*/
+	/* TODO: Call N PHY Force RF Seq with 2 as argument */
+	/* TODO: Write an N PHY Table with ID 7, length 2, offset 0x110,
+		width 16, and data from gain_save */
+
+	b43_nphy_stay_in_carrier_search(dev, 0);
+
+	return ret;
+}
+
+static int b43_nphy_rev3_cal_rx_iq(struct b43_wldev *dev,
+			struct nphy_txgains target, u8 type, bool debug)
+{
+	return -1;
+}
+
+/* http://bcm-v4.sipsolutions.net/802.11/PHY/N/CalRxIq */
+static int b43_nphy_cal_rx_iq(struct b43_wldev *dev,
+			struct nphy_txgains target, u8 type, bool debug)
+{
+	if (dev->phy.rev >= 3)
+		return b43_nphy_rev3_cal_rx_iq(dev, target, type, debug);
+	else
+		return b43_nphy_rev2_cal_rx_iq(dev, target, type, debug);
+}
+
 /*
  * Init N-PHY
  * http://bcm-v4.sipsolutions.net/802.11/PHY/Init/N
@@ -1831,16 +2031,14 @@ int b43_phy_initn(struct b43_wldev *dev)
 		}
 	}
 
-	/*
 	if (!b43_nphy_cal_tx_iq_lo(dev, target, true, false)) {
 		if (b43_nphy_cal_rx_iq(dev, target, 2, 0) == 0)
-			Call N PHY Save Cal
+			;/* Call N PHY Save Cal */
 		else if (nphy->mphase_cal_phase_id == 0)
-			N PHY Periodic Calibration with argument 3
+			;/* N PHY Periodic Calibration with argument 3 */
 	} else {
 		b43_nphy_restore_cal(dev);
 	}
-	*/
 
 	/* b43_nphy_tx_pwr_ctrl_coef_setup(dev); */
 	/* TODO N PHY TX Power Control Enable with argument tx_pwr_state */