ath5k: Update gain_F calibration code and add documentation

 * Update and cleanup rf gain optimization code

 * Add comments and refferences to docs and use sane function names

 * Use only step index on ath5k_gain, no need to have a pointer to
   the current step since we can determine te step from it's index,
   this also allows us to put all other structs on rfgain.h and cleanup
   ath5k.h a little

 * No need for ah_rfgain variable, we use ah_gain.g_state for everything

 * Tested on RF2112B chip but gain_F calibration is not yet done
   (we will finish this on the next patch where we'll rewrite rf-buffer
   handling)

 * Use initial rf gain settings for 2316 and 2317 SoCs introduced on a previous patch

 It seems big but it's mostly cleanup, very few functional changes have been made on phy.c

  Signed-off-by: Nick Kossifidis <mickflemm@gmail.com>

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

1 files changed, 38 insertions, 2 deletions

diff --git a/drivers/net/wireless/ath5k/rfgain.h b/drivers/net/wireless/ath5k/rfgain.h
index 6dd2ea13ff4..1354d8c392c 100644
--- a/drivers/net/wireless/ath5k/rfgain.h
+++ b/drivers/net/wireless/ath5k/rfgain.h
@@ -441,12 +441,38 @@ static const struct ath5k_ini_rfgain rfgain_2425[] = {
 	{ AR5K_RF_GAIN(63),	{ 0x00000000, 0x000000f9 } },
 };
 
+#define AR5K_GAIN_CRN_FIX_BITS_5111		4
+#define AR5K_GAIN_CRN_FIX_BITS_5112		7
+#define AR5K_GAIN_CRN_MAX_FIX_BITS		AR5K_GAIN_CRN_FIX_BITS_5112
+#define AR5K_GAIN_DYN_ADJUST_HI_MARGIN		15
+#define AR5K_GAIN_DYN_ADJUST_LO_MARGIN		20
+#define AR5K_GAIN_CCK_PROBE_CORR		5
+#define AR5K_GAIN_CCK_OFDM_GAIN_DELTA		15
+#define AR5K_GAIN_STEP_COUNT			10
+
+/* Check if our current measurement is inside our
+ * current variable attenuation window */
+#define AR5K_GAIN_CHECK_ADJUST(_g) 		\
+	((_g)->g_current <= (_g)->g_low || (_g)->g_current >= (_g)->g_high)
+
+struct ath5k_gain_opt_step {
+	s8				gos_param[AR5K_GAIN_CRN_MAX_FIX_BITS];
+	s8				gos_gain;
+};
+
 struct ath5k_gain_opt {
-	u32			go_default;
-	u32			go_steps_count;
+	u8				go_default;
+	u8				go_steps_count;
 	const struct ath5k_gain_opt_step	go_step[AR5K_GAIN_STEP_COUNT];
 };
 
+/*
+ * Parameters on gos_param:
+ * 1) Tx clip PHY register
+ * 2) PWD 90 RF register
+ * 3) PWD 84 RF register
+ * 4) RFGainSel RF register
+ */
 static const struct ath5k_gain_opt rfgain_opt_5111 = {
 	4,
 	9,
@@ -463,6 +489,16 @@ static const struct ath5k_gain_opt rfgain_opt_5111 = {
 	}
 };
 
+/*
+ * Parameters on gos_param:
+ * 1) Mixgain ovr RF register
+ * 2) PWD 138 RF register
+ * 3) PWD 137 RF register
+ * 4) PWD 136 RF register
+ * 5) PWD 132 RF register
+ * 6) PWD 131 RF register
+ * 7) PWD 130 RF register
+ */
 static const struct ath5k_gain_opt rfgain_opt_5112 = {
 	1,
 	8,