ath9k: Process the AIC calibration results
authorSujith Manoharan <c_manoha@qca.qualcomm.com>
Sat, 14 Mar 2015 05:57:52 +0000 (11:27 +0530)
committerKalle Valo <kvalo@codeaurora.org>
Fri, 20 Mar 2015 06:27:23 +0000 (08:27 +0200)
This patch adds support for post-processing
the AIC calibration results.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
drivers/net/wireless/ath/ath9k/ar9003_aic.c

index 00aaf4d..51ecc9b 100644 (file)
 #include "ar9003_aic.h"
 #include "reg_aic.h"
 
+static const u8 com_att_db_table[ATH_AIC_MAX_COM_ATT_DB_TABLE] = {
+       0, 3, 9, 15, 21, 27
+};
+
+static const u16 aic_lin_table[ATH_AIC_MAX_AIC_LIN_TABLE] = {
+       8191, 7300, 6506, 5799, 5168, 4606, 4105, 3659,
+       3261, 2906, 2590, 2309, 2057, 1834, 1634, 1457,
+       1298, 1157, 1031, 919,  819,  730,  651,  580,
+       517,  461,  411,  366,  326,  291,  259,  231,
+       206,  183,  163,  146,  130,  116,  103,  92,
+       82,   73,   65,   58,   52,   46,   41,   37,
+       33,   29,   26,   23,   21,   18,   16,   15,
+       13,   12,   10,   9,    8,    7,    7,    6,
+       5,    5,    4,    4,    3
+};
+
 static bool ar9003_hw_is_aic_enabled(struct ath_hw *ah)
 {
        struct ath9k_hw_mci *mci_hw = &ah->btcoex_hw.mci;
@@ -30,6 +46,56 @@ static bool ar9003_hw_is_aic_enabled(struct ath_hw *ah)
        return true;
 }
 
+static int16_t ar9003_aic_find_valid(struct ath_aic_sram_info *cal_sram,
+                                    bool dir, u8 index)
+{
+       int16_t i;
+
+       if (dir) {
+               for (i = index + 1; i < ATH_AIC_MAX_BT_CHANNEL; i++) {
+                       if (cal_sram[i].valid)
+                               break;
+               }
+       } else {
+               for (i = index - 1; i >= 0; i--) {
+                       if (cal_sram[i].valid)
+                               break;
+               }
+       }
+
+       if ((i >= ATH_AIC_MAX_BT_CHANNEL) || (i < 0))
+               i = -1;
+
+       return i;
+}
+
+/*
+ * type 0: aic_lin_table, 1: com_att_db_table
+ */
+static int16_t ar9003_aic_find_index(u8 type, int16_t value)
+{
+       int16_t i = -1;
+
+       if (type == 0) {
+               for (i = ATH_AIC_MAX_AIC_LIN_TABLE - 1; i >= 0; i--) {
+                       if (aic_lin_table[i] >= value)
+                               break;
+               }
+       } else if (type == 1) {
+               for (i = 0; i < ATH_AIC_MAX_COM_ATT_DB_TABLE; i++) {
+                       if (com_att_db_table[i] > value) {
+                               i--;
+                               break;
+                       }
+               }
+
+               if (i >= ATH_AIC_MAX_COM_ATT_DB_TABLE)
+                       i = -1;
+       }
+
+       return i;
+}
+
 static void ar9003_aic_gain_table(struct ath_hw *ah)
 {
        u32 aic_atten_word[19], i;
@@ -186,12 +252,191 @@ static void ar9003_aic_cal_start(struct ath_hw *ah, u8 min_valid_count)
        aic->aic_cal_state = AIC_CAL_STATE_STARTED;
 }
 
+static bool ar9003_aic_cal_post_process(struct ath_hw *ah)
+{
+       struct ath9k_hw_aic *aic = &ah->btcoex_hw.aic;
+       struct ath_aic_sram_info cal_sram[ATH_AIC_MAX_BT_CHANNEL];
+       struct ath_aic_out_info aic_sram[ATH_AIC_MAX_BT_CHANNEL];
+       u32 dir_path_gain_idx, quad_path_gain_idx, value;
+       u32 fixed_com_att_db;
+       int8_t dir_path_sign, quad_path_sign;
+       int16_t i;
+       bool ret = true;
+
+       memset(&cal_sram, 0, sizeof(cal_sram));
+       memset(&aic_sram, 0, sizeof(aic_sram));
+
+       for (i = 0; i < ATH_AIC_MAX_BT_CHANNEL; i++) {
+               value = aic->aic_sram[i];
+
+               cal_sram[i].valid =
+                       MS(value, AR_PHY_AIC_SRAM_VALID);
+               cal_sram[i].rot_quad_att_db =
+                       MS(value, AR_PHY_AIC_SRAM_ROT_QUAD_ATT_DB);
+               cal_sram[i].vga_quad_sign =
+                       MS(value, AR_PHY_AIC_SRAM_VGA_QUAD_SIGN);
+               cal_sram[i].rot_dir_att_db =
+                       MS(value, AR_PHY_AIC_SRAM_ROT_DIR_ATT_DB);
+               cal_sram[i].vga_dir_sign =
+                       MS(value, AR_PHY_AIC_SRAM_VGA_DIR_SIGN);
+               cal_sram[i].com_att_6db =
+                       MS(value, AR_PHY_AIC_SRAM_COM_ATT_6DB);
+
+               if (cal_sram[i].valid) {
+                       dir_path_gain_idx = cal_sram[i].rot_dir_att_db +
+                               com_att_db_table[cal_sram[i].com_att_6db];
+                       quad_path_gain_idx = cal_sram[i].rot_quad_att_db +
+                               com_att_db_table[cal_sram[i].com_att_6db];
+
+                       dir_path_sign = (cal_sram[i].vga_dir_sign) ? 1 : -1;
+                       quad_path_sign = (cal_sram[i].vga_quad_sign) ? 1 : -1;
+
+                       aic_sram[i].dir_path_gain_lin = dir_path_sign *
+                               aic_lin_table[dir_path_gain_idx];
+                       aic_sram[i].quad_path_gain_lin = quad_path_sign *
+                               aic_lin_table[quad_path_gain_idx];
+               }
+       }
+
+       for (i = 0; i < ATH_AIC_MAX_BT_CHANNEL; i++) {
+               int16_t start_idx, end_idx;
+
+               if (cal_sram[i].valid)
+                       continue;
+
+               start_idx = ar9003_aic_find_valid(cal_sram, 0, i);
+               end_idx = ar9003_aic_find_valid(cal_sram, 1, i);
+
+               if (start_idx < 0) {
+                       /* extrapolation */
+                       start_idx = end_idx;
+                       end_idx = ar9003_aic_find_valid(cal_sram, 1, start_idx);
+
+                       if (end_idx < 0) {
+                               ret = false;
+                               break;
+                       }
+
+                       aic_sram[i].dir_path_gain_lin =
+                               ((aic_sram[start_idx].dir_path_gain_lin -
+                                 aic_sram[end_idx].dir_path_gain_lin) *
+                                (start_idx - i) + ((end_idx - i) >> 1)) /
+                               (end_idx - i) +
+                               aic_sram[start_idx].dir_path_gain_lin;
+                       aic_sram[i].quad_path_gain_lin =
+                               ((aic_sram[start_idx].quad_path_gain_lin -
+                                 aic_sram[end_idx].quad_path_gain_lin) *
+                                (start_idx - i) + ((end_idx - i) >> 1)) /
+                               (end_idx - i) +
+                               aic_sram[start_idx].quad_path_gain_lin;
+               }
+
+               if (end_idx < 0) {
+                       /* extrapolation */
+                       end_idx = ar9003_aic_find_valid(cal_sram, 0, start_idx);
+
+                       if (end_idx < 0) {
+                               ret = false;
+                               break;
+                       }
+
+                       aic_sram[i].dir_path_gain_lin =
+                               ((aic_sram[start_idx].dir_path_gain_lin -
+                                 aic_sram[end_idx].dir_path_gain_lin) *
+                                (i - start_idx) + ((start_idx - end_idx) >> 1)) /
+                               (start_idx - end_idx) +
+                               aic_sram[start_idx].dir_path_gain_lin;
+                       aic_sram[i].quad_path_gain_lin =
+                               ((aic_sram[start_idx].quad_path_gain_lin -
+                                 aic_sram[end_idx].quad_path_gain_lin) *
+                                (i - start_idx) + ((start_idx - end_idx) >> 1)) /
+                               (start_idx - end_idx) +
+                               aic_sram[start_idx].quad_path_gain_lin;
+
+               } else if (start_idx >= 0){
+                       /* interpolation */
+                       aic_sram[i].dir_path_gain_lin =
+                               (((end_idx - i) * aic_sram[start_idx].dir_path_gain_lin) +
+                                ((i - start_idx) * aic_sram[end_idx].dir_path_gain_lin) +
+                                ((end_idx - start_idx) >> 1)) /
+                               (end_idx - start_idx);
+                       aic_sram[i].quad_path_gain_lin =
+                               (((end_idx - i) * aic_sram[start_idx].quad_path_gain_lin) +
+                                ((i - start_idx) * aic_sram[end_idx].quad_path_gain_lin) +
+                                ((end_idx - start_idx) >> 1))/
+                               (end_idx - start_idx);
+               }
+       }
+
+       /* From dir/quad_path_gain_lin to sram. */
+       i = ar9003_aic_find_valid(cal_sram, 1, 0);
+       if (i < 0) {
+               i = 0;
+               ret = false;
+       }
+       fixed_com_att_db = com_att_db_table[cal_sram[i].com_att_6db];
+
+       for (i = 0; i < ATH_AIC_MAX_BT_CHANNEL; i++) {
+               int16_t rot_dir_path_att_db, rot_quad_path_att_db;
+
+               aic_sram[i].sram.vga_dir_sign =
+                       (aic_sram[i].dir_path_gain_lin >= 0) ? 1 : 0;
+               aic_sram[i].sram.vga_quad_sign=
+                       (aic_sram[i].quad_path_gain_lin >= 0) ? 1 : 0;
+
+               rot_dir_path_att_db =
+                       ar9003_aic_find_index(0, abs(aic_sram[i].dir_path_gain_lin)) -
+                       fixed_com_att_db;
+               rot_quad_path_att_db =
+                       ar9003_aic_find_index(0, abs(aic_sram[i].quad_path_gain_lin)) -
+                       fixed_com_att_db;
+
+               aic_sram[i].sram.com_att_6db =
+                       ar9003_aic_find_index(1, fixed_com_att_db);
+
+               aic_sram[i].sram.valid = 1;
+
+               aic_sram[i].sram.rot_dir_att_db =
+                       min(max(rot_dir_path_att_db,
+                               (int16_t)ATH_AIC_MIN_ROT_DIR_ATT_DB),
+                           ATH_AIC_MAX_ROT_DIR_ATT_DB);
+               aic_sram[i].sram.rot_quad_att_db =
+                       min(max(rot_quad_path_att_db,
+                               (int16_t)ATH_AIC_MIN_ROT_QUAD_ATT_DB),
+                           ATH_AIC_MAX_ROT_QUAD_ATT_DB);
+       }
+
+       for (i = 0; i < ATH_AIC_MAX_BT_CHANNEL; i++) {
+               aic->aic_sram[i] = (SM(aic_sram[i].sram.vga_dir_sign,
+                                      AR_PHY_AIC_SRAM_VGA_DIR_SIGN) |
+                                   SM(aic_sram[i].sram.vga_quad_sign,
+                                      AR_PHY_AIC_SRAM_VGA_QUAD_SIGN) |
+                                   SM(aic_sram[i].sram.com_att_6db,
+                                      AR_PHY_AIC_SRAM_COM_ATT_6DB) |
+                                   SM(aic_sram[i].sram.valid,
+                                      AR_PHY_AIC_SRAM_VALID) |
+                                   SM(aic_sram[i].sram.rot_dir_att_db,
+                                      AR_PHY_AIC_SRAM_ROT_DIR_ATT_DB) |
+                                   SM(aic_sram[i].sram.rot_quad_att_db,
+                                      AR_PHY_AIC_SRAM_ROT_QUAD_ATT_DB));
+       }
+
+       return ret;
+}
+
 static void ar9003_aic_cal_done(struct ath_hw *ah)
 {
+       struct ath9k_hw_aic *aic = &ah->btcoex_hw.aic;
+
        /* Disable AIC reference signal in BT modem. */
        REG_WRITE(ah, ATH_AIC_BT_JUPITER_CTRL,
                  (REG_READ(ah, ATH_AIC_BT_JUPITER_CTRL) &
                   ~ATH_AIC_BT_AIC_ENABLE));
+
+       if (ar9003_aic_cal_post_process(ah))
+               aic->aic_cal_state = AIC_CAL_STATE_DONE;
+       else
+               aic->aic_cal_state = AIC_CAL_STATE_ERROR;
 }
 
 static u8 ar9003_aic_cal_continue(struct ath_hw *ah, bool cal_once)