b43: N-PHY: RSSI calibration for rev < 3

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

1 files changed, 155 insertions, 2 deletions

diff --git a/drivers/net/wireless/b43/phy_n.c b/drivers/net/wireless/b43/phy_n.c
index a0e84c428e79..126c0afa5da2 100644
--- a/drivers/net/wireless/b43/phy_n.c
+++ b/drivers/net/wireless/b43/phy_n.c
@@ -685,7 +685,160 @@ static int b43_nphy_poll_rssi(struct b43_wldev *dev, u8 type, s32 *buf,
 /* http://bcm-v4.sipsolutions.net/802.11/PHY/N/RSSICal */
 static void b43_nphy_rev2_rssi_cal(struct b43_wldev *dev, u8 type)
 {
-        /* TODO */
+        int i, j;
+        u8 state[4];
+        u8 code, val;
+        u16 class, override;
+        u8 regs_save_radio[2];
+        u16 regs_save_phy[2];
+        s8 offset[4];
+
+        u16 clip_state[2];
+        u16 clip_off[2] = { 0xFFFF, 0xFFFF };
+        s32 results_min[4] = { };
+        u8 vcm_final[4] = { };
+        s32 results[4][4] = { };
+        s32 miniq[4][2] = { };
+
+        if (type == 2) {
+                code = 0;
+                val = 6;
+        } else if (type < 2) {
+                code = 25;
+                val = 4;
+        } else {
+                B43_WARN_ON(1);
+                return;
+        }
+
+        class = b43_nphy_classifier(dev, 0, 0);
+        b43_nphy_classifier(dev, 7, 4);
+        b43_nphy_read_clip_detection(dev, clip_state);
+        b43_nphy_write_clip_detection(dev, clip_off);
+
+        if (b43_current_band(dev->wl) == IEEE80211_BAND_5GHZ)
+                override = 0x140;
+        else
+                override = 0x110;
+
+        regs_save_phy[0] = b43_phy_read(dev, B43_NPHY_RFCTL_INTC1);
+        regs_save_radio[0] = b43_radio_read16(dev, B2055_C1_PD_RXTX);
+        b43_phy_write(dev, B43_NPHY_RFCTL_INTC1, override);
+        b43_radio_write16(dev, B2055_C1_PD_RXTX, val);
+
+        regs_save_phy[1] = b43_phy_read(dev, B43_NPHY_RFCTL_INTC2);
+        regs_save_radio[1] = b43_radio_read16(dev, B2055_C2_PD_RXTX);
+        b43_phy_write(dev, B43_NPHY_RFCTL_INTC2, override);
+        b43_radio_write16(dev, B2055_C2_PD_RXTX, val);
+
+        state[0] = b43_radio_read16(dev, B2055_C1_PD_RSSIMISC) & 0x07;
+        state[1] = b43_radio_read16(dev, B2055_C2_PD_RSSIMISC) & 0x07;
+        b43_radio_mask(dev, B2055_C1_PD_RSSIMISC, 0xF8);
+        b43_radio_mask(dev, B2055_C2_PD_RSSIMISC, 0xF8);
+        state[2] = b43_radio_read16(dev, B2055_C1_SP_RSSI) & 0x07;
+        state[3] = b43_radio_read16(dev, B2055_C2_SP_RSSI) & 0x07;
+
+        b43_nphy_rssi_select(dev, 5, type);
+        b43_nphy_scale_offset_rssi(dev, 0, 0, 5, 0, type);
+        b43_nphy_scale_offset_rssi(dev, 0, 0, 5, 1, type);
+
+        for (i = 0; i < 4; i++) {
+                u8 tmp[4];
+                for (j = 0; j < 4; j++)
+                        tmp[j] = i;
+                if (type != 1)
+                        b43_nphy_set_rssi_2055_vcm(dev, type, tmp);
+                b43_nphy_poll_rssi(dev, type, results[i], 8);
+                if (type < 2)
+                        for (j = 0; j < 2; j++)
+                                miniq[i][j] = min(results[i][2 * j],
+                                                results[i][2 * j + 1]);
+        }
+
+        for (i = 0; i < 4; i++) {
+                s32 mind = 40;
+                u8 minvcm = 0;
+                s32 minpoll = 249;
+                s32 curr;
+                for (j = 0; j < 4; j++) {
+                        if (type == 2)
+                                curr = abs(results[j][i]);
+                        else
+                                curr = abs(miniq[j][i / 2] - code * 8);
+
+                        if (curr < mind) {
+                                mind = curr;
+                                minvcm = j;
+                        }
+
+                        if (results[j][i] < minpoll)
+                                minpoll = results[j][i];
+                }
+                results_min[i] = minpoll;
+                vcm_final[i] = minvcm;
+        }
+
+        if (type != 1)
+                b43_nphy_set_rssi_2055_vcm(dev, type, vcm_final);
+
+        for (i = 0; i < 4; i++) {
+                offset[i] = (code * 8) - results[vcm_final[i]][i];
+
+                if (offset[i] < 0)
+                        offset[i] = -((abs(offset[i]) + 4) / 8);
+                else
+                        offset[i] = (offset[i] + 4) / 8;
+
+                if (results_min[i] == 248)
+                        offset[i] = code - 32;
+
+                if (i % 2 == 0)
+                        b43_nphy_scale_offset_rssi(dev, 0, offset[i], 1, 0,
+                                                        type);
+                else
+                        b43_nphy_scale_offset_rssi(dev, 0, offset[i], 2, 1,
+                                                        type);
+        }
+
+        b43_radio_maskset(dev, B2055_C1_PD_RSSIMISC, 0xF8, state[0]);
+        b43_radio_maskset(dev, B2055_C1_PD_RSSIMISC, 0xF8, state[1]);
+
+        switch (state[2]) {
+        case 1:
+                b43_nphy_rssi_select(dev, 1, 2);
+                break;
+        case 4:
+                b43_nphy_rssi_select(dev, 1, 0);
+                break;
+        case 2:
+                b43_nphy_rssi_select(dev, 1, 1);
+                break;
+        default:
+                b43_nphy_rssi_select(dev, 1, 1);
+                break;
+        }
+
+        switch (state[3]) {
+        case 1:
+                b43_nphy_rssi_select(dev, 2, 2);
+                break;
+        case 4:
+                b43_nphy_rssi_select(dev, 2, 0);
+                break;
+        default:
+                b43_nphy_rssi_select(dev, 2, 1);
+                break;
+        }
+
+        b43_nphy_rssi_select(dev, 0, type);
+
+        b43_phy_write(dev, B43_NPHY_RFCTL_INTC1, regs_save_phy[0]);
+        b43_radio_write16(dev, B2055_C1_PD_RXTX, regs_save_radio[0]);
+        b43_phy_write(dev, B43_NPHY_RFCTL_INTC2, regs_save_phy[1]);
+        b43_radio_write16(dev, B2055_C2_PD_RXTX, regs_save_radio[1]);
+
+        b43_nphy_classifier(dev, 7, class);
+        b43_nphy_write_clip_detection(dev, clip_state);
 }
 
 /* http://bcm-v4.sipsolutions.net/802.11/PHY/N/RSSICalRev3 */
@@ -867,7 +1020,7 @@ int b43_phy_initn(struct b43_wldev *dev)
                         if (nphy->antsel_type == 2)
                                 ;/*TODO NPHY Superswitch Init with argument 1*/
                         if (nphy->perical != 2) {
-                                /* b43_nphy_rssi_cal(dev); */
+                                b43_nphy_rssi_cal(dev);
                                 if (phy->rev >= 3) {
                                         nphy->cal_orig_pwr_idx[0] =
                                             nphy->txpwrindex[0].index_internal;