b43: HT-PHY: implement RSSI polling

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

2 files changed, 100 insertions, 1 deletions

diff --git a/drivers/net/wireless/b43/phy_ht.c b/drivers/net/wireless/b43/phy_ht.c
index 22fdde613a58..ae9cd2978060 100644
--- a/drivers/net/wireless/b43/phy_ht.c
+++ b/drivers/net/wireless/b43/phy_ht.c
@@ -388,6 +388,92 @@ static void b43_phy_ht_tx_tone(struct b43_wldev *dev)
 #endif
 
 /**************************************************
+ * RSSI
+ **************************************************/
+
+#if 0
+static void b43_phy_ht_rssi_select(struct b43_wldev *dev, u8 core_sel,
+                                   u8 rssi_type)
+{
+        static const u16 ctl_regs[3][2] = {
+                { B43_PHY_HT_AFE_C1, B43_PHY_HT_AFE_C1_OVER, },
+                { B43_PHY_HT_AFE_C2, B43_PHY_HT_AFE_C2_OVER, },
+                { B43_PHY_HT_AFE_C3, B43_PHY_HT_AFE_C3_OVER, },
+        };
+        static const u16 radio_r[] = { R2059_SYN, R2059_TXRX0, R2059_RXRX1, };
+        int core;
+
+        if (core_sel == 0) {
+                b43err(dev->wl, "RSSI selection for core off not implemented yet\n");
+        } else {
+                for (core = 0; core < 3; core++) {
+                        /* Check if caller requested a one specific core */
+                        if ((core_sel == 1 && core != 0) ||
+                            (core_sel == 2 && core != 1) ||
+                            (core_sel == 3 && core != 2))
+                                continue;
+
+                        switch (rssi_type) {
+                        case 4:
+                                b43_phy_set(dev, ctl_regs[core][0], 0x3 << 8);
+                                b43_phy_set(dev, ctl_regs[core][0], 0x3 << 10);
+                                b43_phy_set(dev, ctl_regs[core][1], 0x1 << 9);
+                                b43_phy_set(dev, ctl_regs[core][1], 0x1 << 10);
+
+                                b43_radio_set(dev, R2059_RXRX1 | 0xbf, 0x1);
+                                b43_radio_write(dev, radio_r[core] | 0x159,
+                                                0x11);
+                                break;
+                        default:
+                                b43err(dev->wl, "RSSI selection for type %d not implemented yet\n",
+                                       rssi_type);
+                        }
+                }
+        }
+}
+
+static void b43_phy_ht_poll_rssi(struct b43_wldev *dev, u8 type, s32 *buf,
+                                 u8 nsamp)
+{
+        u16 phy_regs_values[12];
+        static const u16 phy_regs_to_save[] = {
+                B43_PHY_HT_AFE_C1, B43_PHY_HT_AFE_C1_OVER,
+                0x848, 0x841,
+                B43_PHY_HT_AFE_C2, B43_PHY_HT_AFE_C2_OVER,
+                0x868, 0x861,
+                B43_PHY_HT_AFE_C3, B43_PHY_HT_AFE_C3_OVER,
+                0x888, 0x881,
+        };
+        u16 tmp[3];
+        int i;
+
+        for (i = 0; i < 12; i++)
+                phy_regs_values[i] = b43_phy_read(dev, phy_regs_to_save[i]);
+
+        b43_phy_ht_rssi_select(dev, 5, type);
+
+        for (i = 0; i < 6; i++)
+                buf[i] = 0;
+
+        for (i = 0; i < nsamp; i++) {
+                tmp[0] = b43_phy_read(dev, B43_PHY_HT_RSSI_C1);
+                tmp[1] = b43_phy_read(dev, B43_PHY_HT_RSSI_C2);
+                tmp[2] = b43_phy_read(dev, B43_PHY_HT_RSSI_C3);
+
+                buf[0] += ((s8)((tmp[0] & 0x3F) << 2)) >> 2;
+                buf[1] += ((s8)(((tmp[0] >> 8) & 0x3F) << 2)) >> 2;
+                buf[2] += ((s8)((tmp[1] & 0x3F) << 2)) >> 2;
+                buf[3] += ((s8)(((tmp[1] >> 8) & 0x3F) << 2)) >> 2;
+                buf[4] += ((s8)((tmp[2] & 0x3F) << 2)) >> 2;
+                buf[5] += ((s8)(((tmp[2] >> 8) & 0x3F) << 2)) >> 2;
+        }
+
+        for (i = 0; i < 12; i++)
+                b43_phy_write(dev, phy_regs_to_save[i], phy_regs_values[i]);
+}
+#endif
+
+/**************************************************
  * Tx/Rx
  **************************************************/
 
@@ -454,12 +540,20 @@ static void b43_phy_ht_tx_power_ctl(struct b43_wldev *dev, bool enable)
 
 static void b43_phy_ht_tx_power_ctl_idle_tssi(struct b43_wldev *dev)
 {
+        struct b43_phy_ht *phy_ht = dev->phy.ht;
+        s32 rssi_buf[6];
+
         /* TODO */
 
         b43_phy_ht_tx_tone(dev);
         udelay(20);
-        /* TODO: poll RSSI */
+        b43_phy_ht_poll_rssi(dev, 4, rssi_buf, 1);
         b43_phy_ht_stop_playback(dev);
+        b43_phy_ht_reset_cca(dev);
+
+        phy_ht->idle_tssi[0] = rssi_buf[0] & 0xff;
+        phy_ht->idle_tssi[1] = rssi_buf[2] & 0xff;
+        phy_ht->idle_tssi[2] = rssi_buf[4] & 0xff;
 
         /* TODO */
 }
diff --git a/drivers/net/wireless/b43/phy_ht.h b/drivers/net/wireless/b43/phy_ht.h
index c51795862b6d..165c5014b7c8 100644
--- a/drivers/net/wireless/b43/phy_ht.h
+++ b/drivers/net/wireless/b43/phy_ht.h
@@ -36,6 +36,9 @@
 #define  B43_PHY_HT_TXPCTL_CMD_C1_PCTLEN        0x8000  /* TX power control enable */
 #define B43_PHY_HT_TXPCTL_CMD_C2                0x222
 #define  B43_PHY_HT_TXPCTL_CMD_C2_INIT          0x007F
+#define B43_PHY_HT_RSSI_C1                      0x219
+#define B43_PHY_HT_RSSI_C2                      0x21A
+#define B43_PHY_HT_RSSI_C3                      0x21B
 
 #define B43_PHY_HT_C1_CLIP1THRES                B43_PHY_OFDM(0x00E)
 #define B43_PHY_HT_C2_CLIP1THRES                B43_PHY_OFDM(0x04E)
@@ -91,6 +94,8 @@ struct b43_phy_ht {
         u8 tx_pwr_idx[3];
 
         s32 bb_mult_save[3];
+
+        u8 idle_tssi[3];
 };