ath5k: rates cleanup

cleanup the rates structures used by ath5k. instead of separate driver and
mac80211 rate structures we now setup a static ieee80211_rate array and use it
directly. no conversion between two different rate structures has to be done
any more. a lot of unused and confusing junk was deleted.

renamed ath5k_getchannels into ath5k_setup_bands because this is what it does.
rewrote it to copy the bitrates correctly for each band. this is necessary for
running different hardware with the same driver (e.g. 5211 and 5212 based
cards).

add special handling of rates for AR5211 chipsets: it uses different rate codes
for CCK rates (which are actually like the other chips but with a 0xF mask).

setup a hardware code to rate index reverse mapping table for getting the rate
index of received frames.

the rates for control frames which have to be set in
ath5k_hw_write_rate_duration are now in one single array.

drivers/net/wireless/ath5k/ath5k.h:     Changes-licensed-under: ISC
drivers/net/wireless/ath5k/base.c:      Changes-licensed-under: 3-Clause-BSD
drivers/net/wireless/ath5k/base.h:      Changes-licensed-under: 3-Clause-BSD
drivers/net/wireless/ath5k/hw.c:        Changes-licensed-under: ISC

Signed-off-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 33 insertions, 129 deletions

diff --git a/drivers/net/wireless/ath5k/ath5k.h b/drivers/net/wireless/ath5k/ath5k.h
index 9102eea3c8b..c1b49787366 100644
--- a/drivers/net/wireless/ath5k/ath5k.h
+++ b/drivers/net/wireless/ath5k/ath5k.h
@@ -271,11 +271,6 @@ enum ath5k_driver_mode {
 /* adding this flag to rate_code enables short preamble, see ar5212_reg.h */
 #define AR5K_SET_SHORT_PREAMBLE 0x04
 
-#define HAS_SHPREAMBLE(_ix) \
-	(rt->rates[_ix].modulation == IEEE80211_RATE_SHORT_PREAMBLE)
-#define SHPREAMBLE_FLAG(_ix) \
-	(HAS_SHPREAMBLE(_ix) ? AR5K_SET_SHORT_PREAMBLE : 0)
-
 
 /****************\
   TX DEFINITIONS
@@ -568,152 +563,61 @@ struct ath5k_athchan_2ghz {
 	u16	a2_athchan;
 };
 
+
 /*
  * Rate definitions
- * TODO: Clean them up or move them on mac80211 -most of these infos are
- * 	 used by the rate control algorytm on MadWiFi.
  */
 
-/* Max number of rates on the rate table and what it seems
- * Atheros hardware supports */
-#define AR5K_MAX_RATES 32
-
 /**
- * struct ath5k_rate - rate structure
- * @valid: is this a valid rate for rate control (remove)
- * @modulation: respective mac80211 modulation
- * @rate_kbps: rate in kbit/s
- * @rate_code: hardware rate value, used in &struct ath5k_desc, on RX on
- *     &struct ath5k_rx_status.rs_rate and on TX on
- *     &struct ath5k_tx_status.ts_rate. Seems the ar5xxx harware supports
- *     up to 32 rates, indexed by 1-32. This means we really only need
- *     6 bits for the rate_code.
- * @dot11_rate: respective IEEE-802.11 rate value
- * @control_rate: index of rate assumed to be used to send control frames.
- *     This can be used to set override the value on the rate duration
- *     registers. This is only useful if we can override in the harware at
- *     what rate we want to send control frames at. Note that IEEE-802.11
- *     Ch. 9.6 (after IEEE 802.11g changes) defines the rate at which we
- *     should send ACK/CTS, if we change this value we can be breaking
- *     the spec.
+ * Seems the ar5xxx harware supports up to 32 rates, indexed by 1-32.
  *
- * This structure is used to get the RX rate or set the TX rate on the
+ * The rate code is used to get the RX rate or set the TX rate on the
  * hardware descriptors. It is also used for internal modulation control
  * and settings.
  *
- * On RX after the &struct ath5k_desc is parsed by the appropriate
- * ah_proc_rx_desc() the respective hardware rate value is set in
- * &struct ath5k_rx_status.rs_rate. On TX the desired rate is set in
- * &struct ath5k_tx_status.ts_rate which is later used to setup the
- * &struct ath5k_desc correctly. This is the hardware rate map we are
- * aware of:
+ * This is the hardware rate map we are aware of:
  *
- * rate_code   1       2       3       4       5       6       7       8
+ * rate_code   0x01    0x02    0x03    0x04    0x05    0x06    0x07    0x08
  * rate_kbps   3000    1000    ?       ?       ?       2000    500     48000
  *
- * rate_code   9       10      11      12      13      14      15      16
+ * rate_code   0x09    0x0A    0x0B    0x0C    0x0D    0x0E    0x0F    0x10
  * rate_kbps   24000   12000   6000    54000   36000   18000   9000    ?
  *
  * rate_code   17      18      19      20      21      22      23      24
  * rate_kbps   ?       ?       ?       ?       ?       ?       ?       11000
  *
  * rate_code   25      26      27      28      29      30      31      32
- * rate_kbps   5500    2000    1000    ?       ?       ?       ?       ?
+ * rate_kbps   5500    2000    1000    11000S  5500S   2000S   ?       ?
  *
+ * "S" indicates CCK rates with short preamble.
+ *
+ * AR5211 has different rate codes for CCK (802.11B) rates. It only uses the
+ * lowest 4 bits, so they are the same as below with a 0xF mask.
+ * (0xB, 0xA, 0x9 and 0x8 for 1M, 2M, 5.5M and 11M).
+ * We handle this in ath5k_setup_bands().
  */
-struct ath5k_rate {
-	u8	valid;
-	u32	modulation;
-	u16	rate_kbps;
-	u8	rate_code;
-	u8	dot11_rate;
-	u8	control_rate;
-};
-
-/* XXX: GRR all this stuff to get leds blinking ??? (check out setcurmode) */
-struct ath5k_rate_table {
-	u16	rate_count;
-	u8	rate_code_to_index[AR5K_MAX_RATES];	/* Back-mapping */
-	struct ath5k_rate rates[AR5K_MAX_RATES];
-};
-
-/*
- * Rate tables...
- * TODO: CLEAN THIS !!!
- */
-#define AR5K_RATES_11A { 8, {					\
-	255, 255, 255, 255, 255, 255, 255, 255, 6, 4, 2, 0,	\
-	7, 5, 3, 1, 255, 255, 255, 255, 255, 255, 255, 255,	\
-	255, 255, 255, 255, 255, 255, 255, 255 }, {		\
-	{ 1, 0, 6000, 11, 140, 0 },		\
-	{ 1, 0, 9000, 15, 18, 0 },		\
-	{ 1, 0, 12000, 10, 152, 2 },		\
-	{ 1, 0, 18000, 14, 36, 2 },		\
-	{ 1, 0, 24000, 9, 176, 4 },		\
-	{ 1, 0, 36000, 13, 72, 4 },		\
-	{ 1, 0, 48000, 8, 96, 4 },		\
-	{ 1, 0, 54000, 12, 108, 4 } }		\
-}
-
-#define AR5K_RATES_11B { 4, {						\
-	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,	\
-	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,	\
-	3, 2, 1, 0, 255, 255, 255, 255 }, {				\
-	{ 1, 0, 1000, 27, 130, 0 },	\
-	{ 1, IEEE80211_RATE_SHORT_PREAMBLE, 2000, 26, 132, 1 },	\
-	{ 1, IEEE80211_RATE_SHORT_PREAMBLE, 5500, 25, 139, 1 },	\
-	{ 1, IEEE80211_RATE_SHORT_PREAMBLE, 11000, 24, 150, 1 } }	\
-}
-
-#define AR5K_RATES_11G { 12, {					\
-	255, 255, 255, 255, 255, 255, 255, 255, 10, 8, 6, 4,	\
-	11, 9, 7, 5, 255, 255, 255, 255, 255, 255, 255, 255,	\
-	3, 2, 1, 0, 255, 255, 255, 255 }, {			\
-	{ 1, 0, 1000, 27, 2, 0 },		\
-	{ 1, IEEE80211_RATE_SHORT_PREAMBLE, 2000, 26, 4, 1 },		\
-	{ 1, IEEE80211_RATE_SHORT_PREAMBLE, 5500, 25, 11, 1 },		\
-	{ 1, IEEE80211_RATE_SHORT_PREAMBLE, 11000, 24, 22, 1 },	\
-	{ 0, 0, 6000, 11, 12, 4 },	\
-	{ 0, 0, 9000, 15, 18, 4 },	\
-	{ 1, 0, 12000, 10, 24, 6 },	\
-	{ 1, 0, 18000, 14, 36, 6 },	\
-	{ 1, 0, 24000, 9, 48, 8 },	\
-	{ 1, 0, 36000, 13, 72, 8 },	\
-	{ 1, 0, 48000, 8, 96, 8 },	\
-	{ 1, 0, 54000, 12, 108, 8 } }	\
-}
+#define AR5K_MAX_RATES 32
 
-#define AR5K_RATES_TURBO { 8, {					\
-	255, 255, 255, 255, 255, 255, 255, 255, 6, 4, 2, 0,	\
-	7, 5, 3, 1, 255, 255, 255, 255, 255, 255, 255, 255,	\
-	255, 255, 255, 255, 255, 255, 255, 255 }, {		\
-	{ 1, MODULATION_TURBO, 6000, 11, 140, 0 },	\
-	{ 1, MODULATION_TURBO, 9000, 15, 18, 0 },	\
-	{ 1, MODULATION_TURBO, 12000, 10, 152, 2 },	\
-	{ 1, MODULATION_TURBO, 18000, 14, 36, 2 },	\
-	{ 1, MODULATION_TURBO, 24000, 9, 176, 4 },	\
-	{ 1, MODULATION_TURBO, 36000, 13, 72, 4 },	\
-	{ 1, MODULATION_TURBO, 48000, 8, 96, 4 },	\
-	{ 1, MODULATION_TURBO, 54000, 12, 108, 4 } }	\
-}
+/* B */
+#define ATH5K_RATE_CODE_1M	0x1B
+#define ATH5K_RATE_CODE_2M	0x1A
+#define ATH5K_RATE_CODE_5_5M	0x19
+#define ATH5K_RATE_CODE_11M	0x18
+/* A and G */
+#define ATH5K_RATE_CODE_6M	0x0B
+#define ATH5K_RATE_CODE_9M	0x0F
+#define ATH5K_RATE_CODE_12M	0x0A
+#define ATH5K_RATE_CODE_18M	0x0E
+#define ATH5K_RATE_CODE_24M	0x09
+#define ATH5K_RATE_CODE_36M	0x0D
+#define ATH5K_RATE_CODE_48M	0x08
+#define ATH5K_RATE_CODE_54M	0x0C
+/* XR */
+#define ATH5K_RATE_CODE_XR_500K	0x07
+#define ATH5K_RATE_CODE_XR_1M	0x02
+#define ATH5K_RATE_CODE_XR_2M	0x06
+#define ATH5K_RATE_CODE_XR_3M	0x01
 
-#define AR5K_RATES_XR { 12, {					\
-	255, 3, 1, 255, 255, 255, 2, 0, 10, 8, 6, 4,		\
-	11, 9, 7, 5, 255, 255, 255, 255, 255, 255, 255, 255,	\
-	255, 255, 255, 255, 255, 255, 255, 255 }, {		\
-	{ 1, MODULATION_XR, 500, 7, 129, 0 },		\
-	{ 1, MODULATION_XR, 1000, 2, 139, 1 },		\
-	{ 1, MODULATION_XR, 2000, 6, 150, 2 },		\
-	{ 1, MODULATION_XR, 3000, 1, 150, 3 },		\
-	{ 1, 0, 6000, 11, 140, 4 },	\
-	{ 1, 0, 9000, 15, 18, 4 },	\
-	{ 1, 0, 12000, 10, 152, 6 },	\
-	{ 1, 0, 18000, 14, 36, 6 },	\
-	{ 1, 0, 24000, 9, 176, 8 },	\
-	{ 1, 0, 36000, 13, 72, 8 },	\
-	{ 1, 0, 48000, 8, 96, 8 },	\
-	{ 1, 0, 54000, 12, 108, 8 } }	\
-}
 
 /*
  * Crypto definitions