b43: Add NPHY channel switch code

This adds code and table data for channel switching on NPHYs.
Signed-off-by: NMichael Buesch <mb@bu3sch.de>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/b43/nphy.c

@@ -35,12 +35,78 @@ void b43_nphy_xmitpower(struct b43_wldev *dev)
 {//TODO
 }
 
+static void b43_chantab_radio_upload(struct b43_wldev *dev,
+				     const struct b43_nphy_channeltab_entry *e)
+{
+	b43_radio_write16(dev, B2055_PLL_REF, e->radio_pll_ref);
+	b43_radio_write16(dev, B2055_RF_PLLMOD0, e->radio_rf_pllmod0);
+	b43_radio_write16(dev, B2055_RF_PLLMOD1, e->radio_rf_pllmod1);
+	b43_radio_write16(dev, B2055_VCO_CAPTAIL, e->radio_vco_captail);
+	b43_radio_write16(dev, B2055_VCO_CAL1, e->radio_vco_cal1);
+	b43_radio_write16(dev, B2055_VCO_CAL2, e->radio_vco_cal2);
+	b43_radio_write16(dev, B2055_PLL_LFC1, e->radio_pll_lfc1);
+	b43_radio_write16(dev, B2055_PLL_LFR1, e->radio_pll_lfr1);
+	b43_radio_write16(dev, B2055_PLL_LFC2, e->radio_pll_lfc2);
+	b43_radio_write16(dev, B2055_LGBUF_CENBUF, e->radio_lgbuf_cenbuf);
+	b43_radio_write16(dev, B2055_LGEN_TUNE1, e->radio_lgen_tune1);
+	b43_radio_write16(dev, B2055_LGEN_TUNE2, e->radio_lgen_tune2);
+	b43_radio_write16(dev, B2055_C1_LGBUF_ATUNE, e->radio_c1_lgbuf_atune);
+	b43_radio_write16(dev, B2055_C1_LGBUF_GTUNE, e->radio_c1_lgbuf_gtune);
+	b43_radio_write16(dev, B2055_C1_RX_RFR1, e->radio_c1_rx_rfr1);
+	b43_radio_write16(dev, B2055_C1_TX_PGAPADTN, e->radio_c1_tx_pgapadtn);
+	b43_radio_write16(dev, B2055_C1_TX_MXBGTRIM, e->radio_c1_tx_mxbgtrim);
+	b43_radio_write16(dev, B2055_C2_LGBUF_ATUNE, e->radio_c2_lgbuf_atune);
+	b43_radio_write16(dev, B2055_C2_LGBUF_GTUNE, e->radio_c2_lgbuf_gtune);
+	b43_radio_write16(dev, B2055_C2_RX_RFR1, e->radio_c2_rx_rfr1);
+	b43_radio_write16(dev, B2055_C2_TX_PGAPADTN, e->radio_c2_tx_pgapadtn);
+	b43_radio_write16(dev, B2055_C2_TX_MXBGTRIM, e->radio_c2_tx_mxbgtrim);
+}
+
+static void b43_chantab_phy_upload(struct b43_wldev *dev,
+				   const struct b43_nphy_channeltab_entry *e)
+{
+	b43_phy_write(dev, B43_NPHY_BW1A, e->phy_bw1a);
+	b43_phy_write(dev, B43_NPHY_BW2, e->phy_bw2);
+	b43_phy_write(dev, B43_NPHY_BW3, e->phy_bw3);
+	b43_phy_write(dev, B43_NPHY_BW4, e->phy_bw4);
+	b43_phy_write(dev, B43_NPHY_BW5, e->phy_bw5);
+	b43_phy_write(dev, B43_NPHY_BW6, e->phy_bw6);
+}
+
+static void b43_nphy_tx_power_fix(struct b43_wldev *dev)
+{
+	//TODO
+}
+
 /* Tune the hardware to a new channel. Don't call this directly.
  * Use b43_radio_selectchannel() */
-void b43_nphy_selectchannel(struct b43_wldev *dev, u8 channel)
+int b43_nphy_selectchannel(struct b43_wldev *dev, u8 channel)
 {
+	const struct b43_nphy_channeltab_entry *tabent;
 
-//TODO
+	tabent = b43_nphy_get_chantabent(dev, channel);
+	if (!tabent)
+		return -ESRCH;
+
+	//FIXME enable/disable band select upper20 in RXCTL
+	if (0 /*FIXME 5Ghz*/)
+		b43_radio_maskset(dev, B2055_MASTER1, 0xFF8F, 0x20);
+	else
+		b43_radio_maskset(dev, B2055_MASTER1, 0xFF8F, 0x50);
+	b43_chantab_radio_upload(dev, tabent);
+	udelay(50);
+	b43_radio_write16(dev, B2055_VCO_CAL10, 5);
+	b43_radio_write16(dev, B2055_VCO_CAL10, 45);
+	b43_radio_write16(dev, B2055_VCO_CAL10, 65);
+	udelay(300);
+	if (0 /*FIXME 5Ghz*/)
+		b43_phy_set(dev, B43_NPHY_BANDCTL, B43_NPHY_BANDCTL_5GHZ);
+	else
+		b43_phy_mask(dev, B43_NPHY_BANDCTL, ~B43_NPHY_BANDCTL_5GHZ);
+	b43_chantab_phy_upload(dev, tabent);
+	b43_nphy_tx_power_fix(dev);
+
+	return 0;
 }
 
 static void b43_radio_init2055_pre(struct b43_wldev *dev)

drivers/net/wireless/b43/nphy.h

@@ -12,6 +12,7 @@
 #define B43_NPHY_CHANNEL			B43_PHY_N(0x005) /* Channel */
 #define B43_NPHY_TXERR				B43_PHY_N(0x007) /* TX error */
 #define B43_NPHY_BANDCTL			B43_PHY_N(0x009) /* Band control */
+#define  B43_NPHY_BANDCTL_5GHZ			0x0001 /* Use the 5GHz band */
 #define B43_NPHY_4WI_ADDR			B43_PHY_N(0x00B) /* Four-wire bus address */
 #define B43_NPHY_4WI_DATAHI			B43_PHY_N(0x00C) /* Four-wire bus data high */
 #define B43_NPHY_4WI_DATALO			B43_PHY_N(0x00D) /* Four-wire bus data low */
@@ -917,7 +918,7 @@ int b43_phy_initn(struct b43_wldev *dev);
 void b43_nphy_radio_turn_on(struct b43_wldev *dev);
 void b43_nphy_radio_turn_off(struct b43_wldev *dev);
 
-void b43_nphy_selectchannel(struct b43_wldev *dev, u8 channel);
+int b43_nphy_selectchannel(struct b43_wldev *dev, u8 channel);
 
 void b43_nphy_xmitpower(struct b43_wldev *dev);
 void b43_nphy_set_rxantenna(struct b43_wldev *dev, int antenna);

drivers/net/wireless/b43/phy.c

@@ -3883,7 +3883,8 @@ int b43_radio_selectchannel(struct b43_wldev *dev,
 	struct b43_phy *phy = &dev->phy;
 	u16 r8, tmp;
 	u16 freq;
-	u16 channelcookie;
+	u16 channelcookie, savedcookie;
+	int err = 0;
 
 	if (channel == 0xFF) {
 		switch (phy->type) {
@@ -3910,12 +3911,15 @@ int b43_radio_selectchannel(struct b43_wldev *dev,
 	if (0 /*FIXME on 5Ghz */)
 		channelcookie |= 0x100;
 	//FIXME set 40Mhz flag if required
+	savedcookie = b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_CHAN);
 	b43_shm_write16(dev, B43_SHM_SHARED, B43_SHM_SH_CHAN, channelcookie);
 
 	switch (phy->type) {
 	case B43_PHYTYPE_A:
-		if (channel > 200)
-			return -EINVAL;
+		if (channel > 200) {
+			err = -EINVAL;
+			goto out;
+		}
 		freq = channel2freq_a(channel);
 
 		r8 = b43_radio_read16(dev, 0x0008);
@@ -3964,8 +3968,10 @@ int b43_radio_selectchannel(struct b43_wldev *dev,
 		b43_phy_xmitpower(dev);	//FIXME correct?
 		break;
 	case B43_PHYTYPE_G:
-		if ((channel < 1) || (channel > 14))
-			return -EINVAL;
+		if ((channel < 1) || (channel > 14)) {
+			err = -EINVAL;
+			goto out;
+		}
 
 		if (synthetic_pu_workaround)
 			b43_synth_pu_workaround(dev, channel);
@@ -3990,7 +3996,9 @@ int b43_radio_selectchannel(struct b43_wldev *dev,
 		}
 		break;
 	case B43_PHYTYPE_N:
-		b43_nphy_selectchannel(dev, channel);
+		err = b43_nphy_selectchannel(dev, channel);
+		if (err)
+			goto out;
 		break;
 	default:
 		B43_WARN_ON(1);
@@ -3999,8 +4007,12 @@ int b43_radio_selectchannel(struct b43_wldev *dev,
 	phy->channel = channel;
 	/* Wait for the radio to tune to the channel and stabilize. */
 	msleep(8);
-
-	return 0;
+out:
+	if (err) {
+		b43_shm_write16(dev, B43_SHM_SHARED,
+				B43_SHM_SH_CHAN, savedcookie);
+	}
+	return err;
 }
 
 void b43_radio_turn_on(struct b43_wldev *dev)

drivers/net/wireless/b43/tables_nphy.h

@@ -4,6 +4,46 @@
 #include <linux/types.h>
 
 
+struct b43_nphy_channeltab_entry {
+	/* The channel number */
+	u8 channel;
+	/* Radio register values on channelswitch */
+	u8 radio_pll_ref;
+	u8 radio_rf_pllmod0;
+	u8 radio_rf_pllmod1;
+	u8 radio_vco_captail;
+	u8 radio_vco_cal1;
+	u8 radio_vco_cal2;
+	u8 radio_pll_lfc1;
+	u8 radio_pll_lfr1;
+	u8 radio_pll_lfc2;
+	u8 radio_lgbuf_cenbuf;
+	u8 radio_lgen_tune1;
+	u8 radio_lgen_tune2;
+	u8 radio_c1_lgbuf_atune;
+	u8 radio_c1_lgbuf_gtune;
+	u8 radio_c1_rx_rfr1;
+	u8 radio_c1_tx_pgapadtn;
+	u8 radio_c1_tx_mxbgtrim;
+	u8 radio_c2_lgbuf_atune;
+	u8 radio_c2_lgbuf_gtune;
+	u8 radio_c2_rx_rfr1;
+	u8 radio_c2_tx_pgapadtn;
+	u8 radio_c2_tx_mxbgtrim;
+	/* PHY register values on channelswitch */
+	u16 phy_bw1a;
+	u16 phy_bw2;
+	u16 phy_bw3;
+	u16 phy_bw4;
+	u16 phy_bw5;
+	u16 phy_bw6;
+	/* The channel frequency in MHz */
+	u16 freq;
+	/* An unknown value */
+	u16 unk2;
+};
+
+
 struct b43_wldev;
 
 /* Upload the default register value table.
@@ -14,4 +54,10 @@ void b2055_upload_inittab(struct b43_wldev *dev,
 			  bool ghz5, bool ignore_uploadflag);
 
 
+/* Get the NPHY Channel Switch Table entry for a channel number.
+ * Returns NULL on failure to find an entry. */
+const struct b43_nphy_channeltab_entry *
+b43_nphy_get_chantabent(struct b43_wldev *dev, u8 channel);
+
+
 #endif /* B43_TABLES_NPHY_H_ */