ath5k: Read Spur channels from EEPROM

* Read Spur channel information from EEPROM and use default channels
 for RF5413 compatible chips that don't have this info on EEPROM.

 Signed-off-by: Nick Kossifidis <mickflemm@gmail.com>
 Signed-off-by: Bob Copeland <me@bobcopeland.com>

Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 56 insertions, 1 deletions

diff --git a/drivers/net/wireless/ath/ath5k/eeprom.c b/drivers/net/wireless/ath/ath5k/eeprom.c
index c85429d2de3..587c5b8ddc2 100644
--- a/drivers/net/wireless/ath/ath5k/eeprom.c
+++ b/drivers/net/wireless/ath/ath5k/eeprom.c
@@ -1694,9 +1694,40 @@ ath5k_eeprom_read_ctl_info(struct ath5k_hw *ah)
         return 0;
 }
 
+static int
+ath5k_eeprom_read_spur_chans(struct ath5k_hw *ah)
+{
+        struct ath5k_eeprom_info *ee = &ah->ah_capabilities.cap_eeprom;
+        u32 offset;
+        u16 val;
+        int ret = 0, i;
+
+        offset = AR5K_EEPROM_CTL(ee->ee_version) +
+                                AR5K_EEPROM_N_CTLS(ee->ee_version);
+
+        if (ee->ee_version < AR5K_EEPROM_VERSION_5_3) {
+                /* No spur info for 5GHz */
+                ee->ee_spur_chans[0][0] = AR5K_EEPROM_NO_SPUR;
+                /* 2 channels for 2GHz (2464/2420) */
+                ee->ee_spur_chans[0][1] = AR5K_EEPROM_5413_SPUR_CHAN_1;
+                ee->ee_spur_chans[1][1] = AR5K_EEPROM_5413_SPUR_CHAN_2;
+                ee->ee_spur_chans[2][1] = AR5K_EEPROM_NO_SPUR;
+        } else if (ee->ee_version >= AR5K_EEPROM_VERSION_5_3) {
+                for (i = 0; i < AR5K_EEPROM_N_SPUR_CHANS; i++) {
+                        AR5K_EEPROM_READ(offset, val);
+                        ee->ee_spur_chans[i][0] = val;
+                        AR5K_EEPROM_READ(offset + AR5K_EEPROM_N_SPUR_CHANS,
+                                                                        val);
+                        ee->ee_spur_chans[i][1] = val;
+                        offset++;
+                }
+        }
+
+        return ret;
+}
 
 /*
- * Initialize eeprom power tables
+ * Initialize eeprom data structure
  */
 int
 ath5k_eeprom_init(struct ath5k_hw *ah)
@@ -1719,6 +1750,10 @@ ath5k_eeprom_init(struct ath5k_hw *ah)
         if (err < 0)
                 return err;
 
+        err = ath5k_eeprom_read_spur_chans(ah);
+        if (err < 0)
+                return err;
+
         return 0;
 }
 
diff --git a/drivers/net/wireless/ath/ath5k/eeprom.h b/drivers/net/wireless/ath/ath5k/eeprom.h
index b0c0606dea0..df9ffa044ea 100644
--- a/drivers/net/wireless/ath/ath5k/eeprom.h
+++ b/drivers/net/wireless/ath/ath5k/eeprom.h
@@ -211,6 +211,23 @@
 #define AR5K_EEPROM_I_GAIN              10
 #define AR5K_EEPROM_CCK_OFDM_DELTA      15
 #define AR5K_EEPROM_N_IQ_CAL            2
+/* 5GHz/2GHz */
+enum ath5k_eeprom_freq_bands{
+        AR5K_EEPROM_BAND_5GHZ = 0,
+        AR5K_EEPROM_BAND_2GHZ = 1,
+        AR5K_EEPROM_N_FREQ_BANDS,
+};
+/* Spur chans per freq band */
+#define AR5K_EEPROM_N_SPUR_CHANS        5
+/* fbin value for chan 2464 x2 */
+#define AR5K_EEPROM_5413_SPUR_CHAN_1    1640
+/* fbin value for chan 2420 x2 */
+#define AR5K_EEPROM_5413_SPUR_CHAN_2    1200
+#define AR5K_EEPROM_SPUR_CHAN_MASK      0x3FFF
+#define AR5K_EEPROM_NO_SPUR             0x8000
+#define AR5K_SPUR_CHAN_WIDTH                    87
+#define AR5K_SPUR_SYMBOL_WIDTH_BASE_100Hz       3125
+#define AR5K_SPUR_SYMBOL_WIDTH_TURBO_100Hz      6250
 
 #define AR5K_EEPROM_READ(_o, _v) do {                   \
         ret = ath5k_hw_eeprom_read(ah, (_o), &(_v));    \
@@ -436,6 +453,9 @@ struct ath5k_eeprom_info {
         s8      ee_pga_desired_size_turbo[AR5K_EEPROM_N_MODES];
         s8      ee_pd_gain_overlap;
 
+        /* Spur mitigation data (fbin values for spur channels) */
+        u16     ee_spur_chans[AR5K_EEPROM_N_SPUR_CHANS][AR5K_EEPROM_N_FREQ_BANDS];
+
         u32     ee_antenna[AR5K_EEPROM_N_MODES][AR5K_ANT_MAX];
 };