ath9k_hw: complete AR9003 calibration

This goes with some new shiny TX IQ calibration that AR9003
hardware family supports.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

4 files changed, 667 insertions, 12 deletions

diff --git a/drivers/net/wireless/ath/ath9k/ar9003_calib.c b/drivers/net/wireless/ath/ath9k/ar9003_calib.c
index f0e8f639ecfd..5e20b4860c7f 100644
--- a/drivers/net/wireless/ath/ath9k/ar9003_calib.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_calib.c
@@ -58,20 +58,108 @@ static void ar9003_hw_setup_calibration(struct ath_hw *ah,
         }
 }
 
+/*
+ * Generic calibration routine.
+ * Recalibrate the lower PHY chips to account for temperature/environment
+ * changes.
+ */
+static bool ar9003_hw_per_calibration(struct ath_hw *ah,
+                                      struct ath9k_channel *ichan,
+                                      u8 rxchainmask,
+                                      struct ath9k_cal_list *currCal)
+{
+        /* Cal is assumed not done until explicitly set below */
+        bool iscaldone = false;
+
+        /* Calibration in progress. */
+        if (currCal->calState == CAL_RUNNING) {
+                /* Check to see if it has finished. */
+                if (!(REG_READ(ah, AR_PHY_TIMING4) & AR_PHY_TIMING4_DO_CAL)) {
+                        /*
+                        * Accumulate cal measures for active chains
+                        */
+                        currCal->calData->calCollect(ah);
+                        ah->cal_samples++;
+
+                        if (ah->cal_samples >=
+                            currCal->calData->calNumSamples) {
+                                unsigned int i, numChains = 0;
+                                for (i = 0; i < AR9300_MAX_CHAINS; i++) {
+                                        if (rxchainmask & (1 << i))
+                                                numChains++;
+                                }
+
+                                /*
+                                * Process accumulated data
+                                */
+                                currCal->calData->calPostProc(ah, numChains);
+
+                                /* Calibration has finished. */
+                                ichan->CalValid |= currCal->calData->calType;
+                                currCal->calState = CAL_DONE;
+                                iscaldone = true;
+                        } else {
+                        /*
+                         * Set-up collection of another sub-sample until we
+                         * get desired number
+                         */
+                        ar9003_hw_setup_calibration(ah, currCal);
+                        }
+                }
+        } else if (!(ichan->CalValid & currCal->calData->calType)) {
+                /* If current cal is marked invalid in channel, kick it off */
+                ath9k_hw_reset_calibration(ah, currCal);
+        }
+
+        return iscaldone;
+}
+
 static bool ar9003_hw_calibrate(struct ath_hw *ah,
                                 struct ath9k_channel *chan,
                                 u8 rxchainmask,
                                 bool longcal)
 {
-        /* TODO */
-        return false;
-}
+        bool iscaldone = true;
+        struct ath9k_cal_list *currCal = ah->cal_list_curr;
+
+        /*
+         * For given calibration:
+         * 1. Call generic cal routine
+         * 2. When this cal is done (isCalDone) if we have more cals waiting
+         *    (eg after reset), mask this to upper layers by not propagating
+         *    isCalDone if it is set to TRUE.
+         *    Instead, change isCalDone to FALSE and setup the waiting cal(s)
+         *    to be run.
+         */
+        if (currCal &&
+            (currCal->calState == CAL_RUNNING ||
+             currCal->calState == CAL_WAITING)) {
+                iscaldone = ar9003_hw_per_calibration(ah, chan,
+                                                      rxchainmask, currCal);
+                if (iscaldone) {
+                        ah->cal_list_curr = currCal = currCal->calNext;
+
+                        if (currCal->calState == CAL_WAITING) {
+                                iscaldone = false;
+                                ath9k_hw_reset_calibration(ah, currCal);
+                        }
+                }
+        }
 
-static bool ar9003_hw_init_cal(struct ath_hw *ah,
-                               struct ath9k_channel *chan)
-{
-        /* TODO */
-        return false;
+        /* Do NF cal only at longer intervals */
+        if (longcal) {
+                /*
+                 * Load the NF from history buffer of the current channel.
+                 * NF is slow time-variant, so it is OK to use a historical
+                 * value.
+                 */
+                ath9k_hw_loadnf(ah, ah->curchan);
+
+                /* start NF calibration, without updating BB NF register */
+                ath9k_hw_start_nfcal(ah);
+        }
+
+        return iscaldone;
 }
 
 static void ar9003_hw_iqcal_collect(struct ath_hw *ah)
@@ -225,13 +313,479 @@ static void ar9003_hw_init_cal_settings(struct ath_hw *ah)
 static bool ar9003_hw_iscal_supported(struct ath_hw *ah,
                                       enum ath9k_cal_types calType)
 {
-        /* TODO */
+        switch (calType & ah->supp_cals) {
+        case IQ_MISMATCH_CAL:
+                /*
+                 * XXX: Run IQ Mismatch for non-CCK only
+                 * Note that CHANNEL_B is never set though.
+                 */
+                return true;
+        case ADC_GAIN_CAL:
+        case ADC_DC_CAL:
+                return false;
+        case TEMP_COMP_CAL:
+                return true;
+        }
+
         return false;
 }
 
-static void ar9003_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan)
+/*
+ * solve 4x4 linear equation used in loopback iq cal.
+ */
+static bool ar9003_hw_solve_iq_cal(struct ath_hw *ah,
+                                   s32 sin_2phi_1,
+                                   s32 cos_2phi_1,
+                                   s32 sin_2phi_2,
+                                   s32 cos_2phi_2,
+                                   s32 mag_a0_d0,
+                                   s32 phs_a0_d0,
+                                   s32 mag_a1_d0,
+                                   s32 phs_a1_d0,
+                                   s32 solved_eq[])
+{
+        s32 f1 = cos_2phi_1 - cos_2phi_2,
+            f3 = sin_2phi_1 - sin_2phi_2,
+            f2;
+        s32 mag_tx, phs_tx, mag_rx, phs_rx;
+        const s32 result_shift = 1 << 15;
+        struct ath_common *common = ath9k_hw_common(ah);
+
+        f2 = (f1 * f1 + f3 * f3) / result_shift;
+
+        if (!f2) {
+                ath_print(common, ATH_DBG_CALIBRATE, "Divide by 0\n");
+                return false;
+        }
+
+        /* mag mismatch, tx */
+        mag_tx = f1 * (mag_a0_d0  - mag_a1_d0) + f3 * (phs_a0_d0 - phs_a1_d0);
+        /* phs mismatch, tx */
+        phs_tx = f3 * (-mag_a0_d0 + mag_a1_d0) + f1 * (phs_a0_d0 - phs_a1_d0);
+
+        mag_tx = (mag_tx / f2);
+        phs_tx = (phs_tx / f2);
+
+        /* mag mismatch, rx */
+        mag_rx = mag_a0_d0 - (cos_2phi_1 * mag_tx + sin_2phi_1 * phs_tx) /
+                 result_shift;
+        /* phs mismatch, rx */
+        phs_rx = phs_a0_d0 + (sin_2phi_1 * mag_tx - cos_2phi_1 * phs_tx) /
+                 result_shift;
+
+        solved_eq[0] = mag_tx;
+        solved_eq[1] = phs_tx;
+        solved_eq[2] = mag_rx;
+        solved_eq[3] = phs_rx;
+
+        return true;
+}
+
+static s32 ar9003_hw_find_mag_approx(struct ath_hw *ah, s32 in_re, s32 in_im)
 {
-        /* TODO */
+        s32 abs_i = abs(in_re),
+            abs_q = abs(in_im),
+            max_abs, min_abs;
+
+        if (abs_i > abs_q) {
+                max_abs = abs_i;
+                min_abs = abs_q;
+        } else {
+                max_abs = abs_q;
+                min_abs = abs_i;
+        }
+
+        return max_abs - (max_abs / 32) + (min_abs / 8) + (min_abs / 4);
+}
+
+#define DELPT 32
+
+static bool ar9003_hw_calc_iq_corr(struct ath_hw *ah,
+                                   s32 chain_idx,
+                                   const s32 iq_res[],
+                                   s32 iqc_coeff[])
+{
+        s32 i2_m_q2_a0_d0, i2_p_q2_a0_d0, iq_corr_a0_d0,
+            i2_m_q2_a0_d1, i2_p_q2_a0_d1, iq_corr_a0_d1,
+            i2_m_q2_a1_d0, i2_p_q2_a1_d0, iq_corr_a1_d0,
+            i2_m_q2_a1_d1, i2_p_q2_a1_d1, iq_corr_a1_d1;
+        s32 mag_a0_d0, mag_a1_d0, mag_a0_d1, mag_a1_d1,
+            phs_a0_d0, phs_a1_d0, phs_a0_d1, phs_a1_d1,
+            sin_2phi_1, cos_2phi_1,
+            sin_2phi_2, cos_2phi_2;
+        s32 mag_tx, phs_tx, mag_rx, phs_rx;
+        s32 solved_eq[4], mag_corr_tx, phs_corr_tx, mag_corr_rx, phs_corr_rx,
+            q_q_coff, q_i_coff;
+        const s32 res_scale = 1 << 15;
+        const s32 delpt_shift = 1 << 8;
+        s32 mag1, mag2;
+        struct ath_common *common = ath9k_hw_common(ah);
+
+        i2_m_q2_a0_d0 = iq_res[0] & 0xfff;
+        i2_p_q2_a0_d0 = (iq_res[0] >> 12) & 0xfff;
+        iq_corr_a0_d0 = ((iq_res[0] >> 24) & 0xff) + ((iq_res[1] & 0xf) << 8);
+
+        if (i2_m_q2_a0_d0 > 0x800)
+                i2_m_q2_a0_d0 = -((0xfff - i2_m_q2_a0_d0) + 1);
+
+        if (i2_p_q2_a0_d0 > 0x800)
+                i2_p_q2_a0_d0 = -((0xfff - i2_p_q2_a0_d0) + 1);
+
+        if (iq_corr_a0_d0 > 0x800)
+                iq_corr_a0_d0 = -((0xfff - iq_corr_a0_d0) + 1);
+
+        i2_m_q2_a0_d1 = (iq_res[1] >> 4) & 0xfff;
+        i2_p_q2_a0_d1 = (iq_res[2] & 0xfff);
+        iq_corr_a0_d1 = (iq_res[2] >> 12) & 0xfff;
+
+        if (i2_m_q2_a0_d1 > 0x800)
+                i2_m_q2_a0_d1 = -((0xfff - i2_m_q2_a0_d1) + 1);
+
+        if (i2_p_q2_a0_d1 > 0x800)
+                i2_p_q2_a0_d1 = -((0xfff - i2_p_q2_a0_d1) + 1);
+
+        if (iq_corr_a0_d1 > 0x800)
+                iq_corr_a0_d1 = -((0xfff - iq_corr_a0_d1) + 1);
+
+        i2_m_q2_a1_d0 = ((iq_res[2] >> 24) & 0xff) + ((iq_res[3] & 0xf) << 8);
+        i2_p_q2_a1_d0 = (iq_res[3] >> 4) & 0xfff;
+        iq_corr_a1_d0 = iq_res[4] & 0xfff;
+
+        if (i2_m_q2_a1_d0 > 0x800)
+                i2_m_q2_a1_d0 = -((0xfff - i2_m_q2_a1_d0) + 1);
+
+        if (i2_p_q2_a1_d0 > 0x800)
+                i2_p_q2_a1_d0 = -((0xfff - i2_p_q2_a1_d0) + 1);
+
+        if (iq_corr_a1_d0 > 0x800)
+                iq_corr_a1_d0 = -((0xfff - iq_corr_a1_d0) + 1);
+
+        i2_m_q2_a1_d1 = (iq_res[4] >> 12) & 0xfff;
+        i2_p_q2_a1_d1 = ((iq_res[4] >> 24) & 0xff) + ((iq_res[5] & 0xf) << 8);
+        iq_corr_a1_d1 = (iq_res[5] >> 4) & 0xfff;
+
+        if (i2_m_q2_a1_d1 > 0x800)
+                i2_m_q2_a1_d1 = -((0xfff - i2_m_q2_a1_d1) + 1);
+
+        if (i2_p_q2_a1_d1 > 0x800)
+                i2_p_q2_a1_d1 = -((0xfff - i2_p_q2_a1_d1) + 1);
+
+        if (iq_corr_a1_d1 > 0x800)
+                iq_corr_a1_d1 = -((0xfff - iq_corr_a1_d1) + 1);
+
+        if ((i2_p_q2_a0_d0 == 0) || (i2_p_q2_a0_d1 == 0) ||
+            (i2_p_q2_a1_d0 == 0) || (i2_p_q2_a1_d1 == 0)) {
+                ath_print(common, ATH_DBG_CALIBRATE,
+                          "Divide by 0:\na0_d0=%d\n"
+                          "a0_d1=%d\na2_d0=%d\na1_d1=%d\n",
+                          i2_p_q2_a0_d0, i2_p_q2_a0_d1,
+                          i2_p_q2_a1_d0, i2_p_q2_a1_d1);
+                return false;
+        }
+
+        mag_a0_d0 = (i2_m_q2_a0_d0 * res_scale) / i2_p_q2_a0_d0;
+        phs_a0_d0 = (iq_corr_a0_d0 * res_scale) / i2_p_q2_a0_d0;
+
+        mag_a0_d1 = (i2_m_q2_a0_d1 * res_scale) / i2_p_q2_a0_d1;
+        phs_a0_d1 = (iq_corr_a0_d1 * res_scale) / i2_p_q2_a0_d1;
+
+        mag_a1_d0 = (i2_m_q2_a1_d0 * res_scale) / i2_p_q2_a1_d0;
+        phs_a1_d0 = (iq_corr_a1_d0 * res_scale) / i2_p_q2_a1_d0;
+
+        mag_a1_d1 = (i2_m_q2_a1_d1 * res_scale) / i2_p_q2_a1_d1;
+        phs_a1_d1 = (iq_corr_a1_d1 * res_scale) / i2_p_q2_a1_d1;
+
+        /* w/o analog phase shift */
+        sin_2phi_1 = (((mag_a0_d0 - mag_a0_d1) * delpt_shift) / DELPT);
+        /* w/o analog phase shift */
+        cos_2phi_1 = (((phs_a0_d1 - phs_a0_d0) * delpt_shift) / DELPT);
+        /* w/  analog phase shift */
+        sin_2phi_2 = (((mag_a1_d0 - mag_a1_d1) * delpt_shift) / DELPT);
+        /* w/  analog phase shift */
+        cos_2phi_2 = (((phs_a1_d1 - phs_a1_d0) * delpt_shift) / DELPT);
+
+        /*
+         * force sin^2 + cos^2 = 1;
+         * find magnitude by approximation
+         */
+        mag1 = ar9003_hw_find_mag_approx(ah, cos_2phi_1, sin_2phi_1);
+        mag2 = ar9003_hw_find_mag_approx(ah, cos_2phi_2, sin_2phi_2);
+
+        if ((mag1 == 0) || (mag2 == 0)) {
+                ath_print(common, ATH_DBG_CALIBRATE,
+                          "Divide by 0: mag1=%d, mag2=%d\n",
+                          mag1, mag2);
+                return false;
+        }
+
+        /* normalization sin and cos by mag */
+        sin_2phi_1 = (sin_2phi_1 * res_scale / mag1);
+        cos_2phi_1 = (cos_2phi_1 * res_scale / mag1);
+        sin_2phi_2 = (sin_2phi_2 * res_scale / mag2);
+        cos_2phi_2 = (cos_2phi_2 * res_scale / mag2);
+
+        /* calculate IQ mismatch */
+        if (!ar9003_hw_solve_iq_cal(ah,
+                             sin_2phi_1, cos_2phi_1,
+                             sin_2phi_2, cos_2phi_2,
+                             mag_a0_d0, phs_a0_d0,
+                             mag_a1_d0,
+                             phs_a1_d0, solved_eq)) {
+                ath_print(common, ATH_DBG_CALIBRATE,
+                          "Call to ar9003_hw_solve_iq_cal() failed.\n");
+                return false;
+        }
+
+        mag_tx = solved_eq[0];
+        phs_tx = solved_eq[1];
+        mag_rx = solved_eq[2];
+        phs_rx = solved_eq[3];
+
+        ath_print(common, ATH_DBG_CALIBRATE,
+                  "chain %d: mag mismatch=%d phase mismatch=%d\n",
+                  chain_idx, mag_tx/res_scale, phs_tx/res_scale);
+
+        if (res_scale == mag_tx) {
+                ath_print(common, ATH_DBG_CALIBRATE,
+                          "Divide by 0: mag_tx=%d, res_scale=%d\n",
+                          mag_tx, res_scale);
+                return false;
+        }
+
+        /* calculate and quantize Tx IQ correction factor */
+        mag_corr_tx = (mag_tx * res_scale) / (res_scale - mag_tx);
+        phs_corr_tx = -phs_tx;
+
+        q_q_coff = (mag_corr_tx * 128 / res_scale);
+        q_i_coff = (phs_corr_tx * 256 / res_scale);
+
+        ath_print(common, ATH_DBG_CALIBRATE,
+                  "tx chain %d: mag corr=%d  phase corr=%d\n",
+                  chain_idx, q_q_coff, q_i_coff);
+
+        if (q_i_coff < -63)
+                q_i_coff = -63;
+        if (q_i_coff > 63)
+                q_i_coff = 63;
+        if (q_q_coff < -63)
+                q_q_coff = -63;
+        if (q_q_coff > 63)
+                q_q_coff = 63;
+
+        iqc_coeff[0] = (q_q_coff * 128) + q_i_coff;
+
+        ath_print(common, ATH_DBG_CALIBRATE,
+                  "tx chain %d: iq corr coeff=%x\n",
+                  chain_idx, iqc_coeff[0]);
+
+        if (-mag_rx == res_scale) {
+                ath_print(common, ATH_DBG_CALIBRATE,
+                          "Divide by 0: mag_rx=%d, res_scale=%d\n",
+                          mag_rx, res_scale);
+                return false;
+        }
+
+        /* calculate and quantize Rx IQ correction factors */
+        mag_corr_rx = (-mag_rx * res_scale) / (res_scale + mag_rx);
+        phs_corr_rx = -phs_rx;
+
+        q_q_coff = (mag_corr_rx * 128 / res_scale);
+        q_i_coff = (phs_corr_rx * 256 / res_scale);
+
+        ath_print(common, ATH_DBG_CALIBRATE,
+                  "rx chain %d: mag corr=%d  phase corr=%d\n",
+                  chain_idx, q_q_coff, q_i_coff);
+
+        if (q_i_coff < -63)
+                q_i_coff = -63;
+        if (q_i_coff > 63)
+                q_i_coff = 63;
+        if (q_q_coff < -63)
+                q_q_coff = -63;
+        if (q_q_coff > 63)
+                q_q_coff = 63;
+
+        iqc_coeff[1] = (q_q_coff * 128) + q_i_coff;
+
+        ath_print(common, ATH_DBG_CALIBRATE,
+                  "rx chain %d: iq corr coeff=%x\n",
+                  chain_idx, iqc_coeff[1]);
+
+        return true;
+}
+
+static void ar9003_hw_tx_iq_cal(struct ath_hw *ah)
+{
+        struct ath_common *common = ath9k_hw_common(ah);
+        const u32 txiqcal_status[AR9300_MAX_CHAINS] = {
+                AR_PHY_TX_IQCAL_STATUS_B0,
+                AR_PHY_TX_IQCAL_STATUS_B1,
+                AR_PHY_TX_IQCAL_STATUS_B2,
+        };
+        const u32 tx_corr_coeff[AR9300_MAX_CHAINS] = {
+                AR_PHY_TX_IQCAL_CORR_COEFF_01_B0,
+                AR_PHY_TX_IQCAL_CORR_COEFF_01_B1,
+                AR_PHY_TX_IQCAL_CORR_COEFF_01_B2,
+        };
+        const u32 rx_corr[AR9300_MAX_CHAINS] = {
+                AR_PHY_RX_IQCAL_CORR_B0,
+                AR_PHY_RX_IQCAL_CORR_B1,
+                AR_PHY_RX_IQCAL_CORR_B2,
+        };
+        const u_int32_t chan_info_tab[] = {
+                AR_PHY_CHAN_INFO_TAB_0,
+                AR_PHY_CHAN_INFO_TAB_1,
+                AR_PHY_CHAN_INFO_TAB_2,
+        };
+        s32 iq_res[6];
+        s32 iqc_coeff[2];
+        s32 i, j;
+        u32 num_chains = 0;
+
+        for (i = 0; i < AR9300_MAX_CHAINS; i++) {
+                if (ah->txchainmask & (1 << i))
+                        num_chains++;
+        }
+
+        REG_RMW_FIELD(ah, AR_PHY_TX_IQCAL_CONTROL_1,
+                      AR_PHY_TX_IQCAQL_CONTROL_1_IQCORR_I_Q_COFF_DELPT,
+                      DELPT);
+        REG_RMW_FIELD(ah, AR_PHY_TX_IQCAL_START,
+                      AR_PHY_TX_IQCAL_START_DO_CAL,
+                      AR_PHY_TX_IQCAL_START_DO_CAL);
+
+        if (!ath9k_hw_wait(ah, AR_PHY_TX_IQCAL_START,
+                           AR_PHY_TX_IQCAL_START_DO_CAL,
+                           0, AH_WAIT_TIMEOUT)) {
+                ath_print(common, ATH_DBG_CALIBRATE,
+                          "Tx IQ Cal not complete.\n");
+                goto TX_IQ_CAL_FAILED;
+        }
+
+        for (i = 0; i < num_chains; i++) {
+                ath_print(common, ATH_DBG_CALIBRATE,
+                          "Doing Tx IQ Cal for chain %d.\n", i);
+
+                if (REG_READ(ah, txiqcal_status[i]) &
+                             AR_PHY_TX_IQCAL_STATUS_FAILED) {
+                        ath_print(common, ATH_DBG_CALIBRATE,
+                                  "Tx IQ Cal failed for chain %d.\n", i);
+                        goto TX_IQ_CAL_FAILED;
+                }
+
+                for (j = 0; j < 3; j++) {
+                        u_int8_t idx = 2 * j,
+                        offset = 4 * j;
+
+                        REG_RMW_FIELD(ah, AR_PHY_CHAN_INFO_MEMORY,
+                                      AR_PHY_CHAN_INFO_TAB_S2_READ, 0);
+
+                        /* 32 bits */
+                        iq_res[idx] = REG_READ(ah, chan_info_tab[i] + offset);
+
+                        REG_RMW_FIELD(ah, AR_PHY_CHAN_INFO_MEMORY,
+                                      AR_PHY_CHAN_INFO_TAB_S2_READ, 1);
+
+                        /* 16 bits */
+                        iq_res[idx+1] = 0xffff & REG_READ(ah,
+                                                          chan_info_tab[i] +
+                                                          offset);
+
+                        ath_print(common, ATH_DBG_CALIBRATE,
+                                  "IQ RES[%d]=0x%x IQ_RES[%d]=0x%x\n",
+                                  idx, iq_res[idx], idx+1, iq_res[idx+1]);
+                }
+
+                if (!ar9003_hw_calc_iq_corr(ah, i, iq_res, iqc_coeff)) {
+                        ath_print(common, ATH_DBG_CALIBRATE,
+                                  "Failed in calculation of IQ correction.\n");
+                        goto TX_IQ_CAL_FAILED;
+                }
+
+                ath_print(common, ATH_DBG_CALIBRATE,
+                          "IQ_COEFF[0] = 0x%x IQ_COEFF[1] = 0x%x\n",
+                          iqc_coeff[0], iqc_coeff[1]);
+
+                REG_RMW_FIELD(ah, tx_corr_coeff[i],
+                              AR_PHY_TX_IQCAL_CORR_COEFF_01_COEFF_TABLE,
+                              iqc_coeff[0]);
+                REG_RMW_FIELD(ah, rx_corr[i],
+                              AR_PHY_RX_IQCAL_CORR_LOOPBACK_IQCORR_Q_Q_COFF,
+                              iqc_coeff[1] >> 7);
+                REG_RMW_FIELD(ah, rx_corr[i],
+                              AR_PHY_RX_IQCAL_CORR_LOOPBACK_IQCORR_Q_I_COFF,
+                              iqc_coeff[1]);
+        }
+
+        REG_RMW_FIELD(ah, AR_PHY_TX_IQCAL_CONTROL_3,
+                      AR_PHY_TX_IQCAL_CONTROL_3_IQCORR_EN, 0x1);
+        REG_RMW_FIELD(ah, AR_PHY_RX_IQCAL_CORR_B0,
+                      AR_PHY_RX_IQCAL_CORR_B0_LOOPBACK_IQCORR_EN, 0x1);
+
+        return;
+
+TX_IQ_CAL_FAILED:
+        ath_print(common, ATH_DBG_CALIBRATE, "Tx IQ Cal failed\n");
+        return;
+}
+
+static bool ar9003_hw_init_cal(struct ath_hw *ah,
+                               struct ath9k_channel *chan)
+{
+        struct ath_common *common = ath9k_hw_common(ah);
+
+        /*
+         * 0x7 = 0b111 , AR9003 needs to be configured for 3-chain mode before
+         * running AGC/TxIQ cals
+         */
+        ar9003_hw_set_chain_masks(ah, 0x7, 0x7);
+
+        /* Calibrate the AGC */
+        REG_WRITE(ah, AR_PHY_AGC_CONTROL,
+                  REG_READ(ah, AR_PHY_AGC_CONTROL) |
+                  AR_PHY_AGC_CONTROL_CAL);
+
+        /* Poll for offset calibration complete */
+        if (!ath9k_hw_wait(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_CAL,
+                           0, AH_WAIT_TIMEOUT)) {
+                ath_print(common, ATH_DBG_CALIBRATE,
+                          "offset calibration failed to "
+                          "complete in 1ms; noisy environment?\n");
+                return false;
+        }
+
+        /* Do Tx IQ Calibration */
+        ar9003_hw_tx_iq_cal(ah);
+
+        /* Revert chainmasks to their original values before NF cal */
+        ar9003_hw_set_chain_masks(ah, ah->rxchainmask, ah->txchainmask);
+
+        /* Initialize list pointers */
+        ah->cal_list = ah->cal_list_last = ah->cal_list_curr = NULL;
+
+        if (ar9003_hw_iscal_supported(ah, IQ_MISMATCH_CAL)) {
+                INIT_CAL(&ah->iq_caldata);
+                INSERT_CAL(ah, &ah->iq_caldata);
+                ath_print(common, ATH_DBG_CALIBRATE,
+                          "enabling IQ Calibration.\n");
+        }
+
+        if (ar9003_hw_iscal_supported(ah, TEMP_COMP_CAL)) {
+                INIT_CAL(&ah->tempCompCalData);
+                INSERT_CAL(ah, &ah->tempCompCalData);
+                ath_print(common, ATH_DBG_CALIBRATE,
+                          "enabling Temperature Compensation Calibration.\n");
+        }
+
+        /* Initialize current pointer to first element in list */
+        ah->cal_list_curr = ah->cal_list;
+
+        if (ah->cal_list_curr)
+                ath9k_hw_reset_calibration(ah, ah->cal_list_curr);
+
+        chan->CalValid = 0;
+
+        return true;
 }
 
 void ar9003_hw_attach_calib_ops(struct ath_hw *ah)
@@ -243,7 +797,6 @@ void ar9003_hw_attach_calib_ops(struct ath_hw *ah)
         priv_ops->init_cal = ar9003_hw_init_cal;
         priv_ops->setup_calibration = ar9003_hw_setup_calibration;
         priv_ops->iscal_supported = ar9003_hw_iscal_supported;
-        priv_ops->loadnf = ar9003_hw_loadnf;
 
         ops->calibrate = ar9003_hw_calibrate;
 }
diff --git a/drivers/net/wireless/ath/ath9k/ar9003_phy.c b/drivers/net/wireless/ath/ath9k/ar9003_phy.c
index 67b3b6518436..fee07fd7a595 100644
--- a/drivers/net/wireless/ath/ath9k/ar9003_phy.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_phy.c
@@ -814,6 +814,105 @@ void ar9003_hw_set_nf_limits(struct ath_hw *ah)
         ah->nf_5g_min = AR_PHY_CCA_MIN_GOOD_VAL_9300_5GHZ;
 }
 
+/*
+ * Find out which of the RX chains are enabled
+ */
+static u32 ar9003_hw_get_rx_chainmask(struct ath_hw *ah)
+{
+        u32 chain = REG_READ(ah, AR_PHY_RX_CHAINMASK);
+        /*
+         * The bits [2:0] indicate the rx chain mask and are to be
+         * interpreted as follows:
+         * 00x => Only chain 0 is enabled
+         * 01x => Chain 1 and 0 enabled
+         * 1xx => Chain 2,1 and 0 enabled
+         */
+        return chain & 0x7;
+}
+
+static void ar9003_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan)
+{
+        struct ath9k_nfcal_hist *h;
+        unsigned i, j;
+        int32_t val;
+        const u32 ar9300_cca_regs[6] = {
+                AR_PHY_CCA_0,
+                AR_PHY_CCA_1,
+                AR_PHY_CCA_2,
+                AR_PHY_EXT_CCA,
+                AR_PHY_EXT_CCA_1,
+                AR_PHY_EXT_CCA_2,
+        };
+        u8 chainmask, rx_chain_status;
+        struct ath_common *common = ath9k_hw_common(ah);
+
+        rx_chain_status = ar9003_hw_get_rx_chainmask(ah);
+
+        chainmask = 0x3F;
+        h = ah->nfCalHist;
+
+        for (i = 0; i < NUM_NF_READINGS; i++) {
+                if (chainmask & (1 << i)) {
+                        val = REG_READ(ah, ar9300_cca_regs[i]);
+                        val &= 0xFFFFFE00;
+                        val |= (((u32) (h[i].privNF) << 1) & 0x1ff);
+                        REG_WRITE(ah, ar9300_cca_regs[i], val);
+                }
+        }
+
+        /*
+         * Load software filtered NF value into baseband internal minCCApwr
+         * variable.
+         */
+        REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL,
+                    AR_PHY_AGC_CONTROL_ENABLE_NF);
+        REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL,
+                    AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
+        REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
+
+        /*
+         * Wait for load to complete, should be fast, a few 10s of us.
+         * The max delay was changed from an original 250us to 10000us
+         * since 250us often results in NF load timeout and causes deaf
+         * condition during stress testing 12/12/2009
+         */
+        for (j = 0; j < 1000; j++) {
+                if ((REG_READ(ah, AR_PHY_AGC_CONTROL) &
+                     AR_PHY_AGC_CONTROL_NF) == 0)
+                        break;
+                udelay(10);
+        }
+
+        /*
+         * We timed out waiting for the noisefloor to load, probably due to an
+         * in-progress rx. Simply return here and allow the load plenty of time
+         * to complete before the next calibration interval.  We need to avoid
+         * trying to load -50 (which happens below) while the previous load is
+         * still in progress as this can cause rx deafness. Instead by returning
+         * here, the baseband nf cal will just be capped by our present
+         * noisefloor until the next calibration timer.
+         */
+        if (j == 1000) {
+                ath_print(common, ATH_DBG_ANY, "Timeout while waiting for nf "
+                          "to load: AR_PHY_AGC_CONTROL=0x%x\n",
+                          REG_READ(ah, AR_PHY_AGC_CONTROL));
+        }
+
+        /*
+         * Restore maxCCAPower register parameter again so that we're not capped
+         * by the median we just loaded.  This will be initial (and max) value
+         * of next noise floor calibration the baseband does.
+         */
+        for (i = 0; i < NUM_NF_READINGS; i++) {
+                if (chainmask & (1 << i)) {
+                        val = REG_READ(ah, ar9300_cca_regs[i]);
+                        val &= 0xFFFFFE00;
+                        val |= (((u32) (-50) << 1) & 0x1ff);
+                        REG_WRITE(ah, ar9300_cca_regs[i], val);
+                }
+        }
+}
+
 void ar9003_hw_attach_phy_ops(struct ath_hw *ah)
 {
         struct ath_hw_private_ops *priv_ops = ath9k_hw_private_ops(ah);
@@ -833,4 +932,5 @@ void ar9003_hw_attach_phy_ops(struct ath_hw *ah)
         priv_ops->set_diversity = ar9003_hw_set_diversity;
         priv_ops->ani_control = ar9003_hw_ani_control;
         priv_ops->do_getnf = ar9003_hw_do_getnf;
+        priv_ops->loadnf = ar9003_hw_loadnf;
 }
diff --git a/drivers/net/wireless/ath/ath9k/eeprom.h b/drivers/net/wireless/ath/ath9k/eeprom.h
index e087e2de6067..c0cd717738c0 100644
--- a/drivers/net/wireless/ath/ath9k/eeprom.h
+++ b/drivers/net/wireless/ath/ath9k/eeprom.h
@@ -155,6 +155,7 @@
 #define AR5416_BCHAN_UNUSED             0xFF
 #define AR5416_MAX_PWR_RANGE_IN_HALF_DB 64
 #define AR5416_MAX_CHAINS               3
+#define AR9300_MAX_CHAINS               3
 #define AR5416_PWR_TABLE_OFFSET_DB     -5
 
 /* Rx gain type values */
diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h
index d28a904606b8..cb0421a910d2 100644
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -611,6 +611,7 @@ struct ath_hw {
         struct ath9k_cal_list adcgain_caldata;
         struct ath9k_cal_list adcdc_calinitdata;
         struct ath9k_cal_list adcdc_caldata;
+        struct ath9k_cal_list tempCompCalData;
         struct ath9k_cal_list *cal_list;
         struct ath9k_cal_list *cal_list_last;
         struct ath9k_cal_list *cal_list_curr;