atheros/ath9k: add common read/write ops and port ath9k to use it

In an effort to make hw code driver core agnostic read
and write operations are defined on the ath_common structure.
This patch adds that and makes ath9k use it. This allows
drivers like ath9k_htc to define its own read/write ops and
still rely on the same hw code. This also paves the way for
sharing code between ath9k/ath5k/ath9k_htc.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath.h

@@ -39,13 +39,19 @@ struct ath_regulatory {
 	struct reg_dmn_pair_mapping *regpair;
 };
 
+struct ath_ops {
+	unsigned int (*read)(void *, u32 reg_offset);
+        void (*write)(void *, u32 val, u32 reg_offset);
+};
+
 struct ath_common {
 	u16 cachelsz;
 	u16 curaid;
 	u8 macaddr[ETH_ALEN];
 	u8 curbssid[ETH_ALEN];
 	u8 bssidmask[ETH_ALEN];
 	struct ath_regulatory regulatory;
+	struct ath_ops *ops;
 };
 
 struct sk_buff *ath_rxbuf_alloc(struct ath_common *common,

drivers/net/wireless/ath/ath9k/ath9k.h

@@ -646,16 +646,6 @@ int ath_get_hal_qnum(u16 queue, struct ath_softc *sc);
 int ath_get_mac80211_qnum(u32 queue, struct ath_softc *sc);
 int ath_cabq_update(struct ath_softc *);
 
-static inline struct ath_common *ath9k_hw_common(struct ath_hw *ah)
-{
-	return &ah->common;
-}
-
-static inline struct ath_regulatory *ath9k_hw_regulatory(struct ath_hw *ah)
-{
-	return &(ath9k_hw_common(ah)->regulatory);
-}
-
 static inline void ath_read_cachesize(struct ath_softc *sc, int *csz)
 {
 	sc->bus_ops->read_cachesize(sc, csz);
@@ -718,8 +708,5 @@ bool ath9k_wiphy_scanning(struct ath_softc *sc);
 void ath9k_wiphy_work(struct work_struct *work);
 bool ath9k_all_wiphys_idle(struct ath_softc *sc);
 
-void ath9k_iowrite32(struct ath_hw *ah, u32 reg_offset, u32 val);
-unsigned int ath9k_ioread32(struct ath_hw *ah, u32 reg_offset);
-
 int ath_tx_get_qnum(struct ath_softc *sc, int qtype, int haltype);
 #endif /* ATH9K_H */

drivers/net/wireless/ath/ath9k/hw.c

@@ -81,38 +81,6 @@ static u32 ath9k_hw_mac_to_clks(struct ath_hw *ah, u32 usecs)
 		return ath9k_hw_mac_clks(ah, usecs);
 }
 
-/*
- * Read and write, they both share the same lock. We do this to serialize
- * reads and writes on Atheros 802.11n PCI devices only. This is required
- * as the FIFO on these devices can only accept sanely 2 requests. After
- * that the device goes bananas. Serializing the reads/writes prevents this
- * from happening.
- */
-
-void ath9k_iowrite32(struct ath_hw *ah, u32 reg_offset, u32 val)
-{
-	if (ah->config.serialize_regmode == SER_REG_MODE_ON) {
-		unsigned long flags;
-		spin_lock_irqsave(&ah->ah_sc->sc_serial_rw, flags);
-		iowrite32(val, ah->ah_sc->mem + reg_offset);
-		spin_unlock_irqrestore(&ah->ah_sc->sc_serial_rw, flags);
-	} else
-		iowrite32(val, ah->ah_sc->mem + reg_offset);
-}
-
-unsigned int ath9k_ioread32(struct ath_hw *ah, u32 reg_offset)
-{
-	u32 val;
-	if (ah->config.serialize_regmode == SER_REG_MODE_ON) {
-		unsigned long flags;
-		spin_lock_irqsave(&ah->ah_sc->sc_serial_rw, flags);
-		val = ioread32(ah->ah_sc->mem + reg_offset);
-		spin_unlock_irqrestore(&ah->ah_sc->sc_serial_rw, flags);
-	} else
-		val = ioread32(ah->ah_sc->mem + reg_offset);
-	return val;
-}
-
 bool ath9k_hw_wait(struct ath_hw *ah, u32 reg, u32 mask, u32 val, u32 timeout)
 {
 	int i;

drivers/net/wireless/ath/ath9k/hw.h

@@ -51,8 +51,11 @@
 #define AT9285_COEX3WIRE_DA_SUBSYSID	0x30ab
 
 /* Register read/write primitives */
-#define REG_WRITE(_ah, _reg, _val) ath9k_iowrite32((_ah), (_reg), (_val))
-#define REG_READ(_ah, _reg) ath9k_ioread32((_ah), (_reg))
+#define REG_WRITE(_ah, _reg, _val) \
+	ath9k_hw_common(_ah)->ops->write((_ah), (_val), (_reg))
+
+#define REG_READ(_ah, _reg) \
+	ath9k_hw_common(_ah)->ops->read((_ah), (_reg))
 
 #define SM(_v, _f)  (((_v) << _f##_S) & _f)
 #define MS(_v, _f)  (((_v) & _f) >> _f##_S)
@@ -588,6 +591,16 @@ struct ath_hw {
 	struct ath_gen_timer_table hw_gen_timers;
 };
 
+static inline struct ath_common *ath9k_hw_common(struct ath_hw *ah)
+{
+	return &ah->common;
+}
+
+static inline struct ath_regulatory *ath9k_hw_regulatory(struct ath_hw *ah)
+{
+	return &(ath9k_hw_common(ah)->regulatory);
+}
+
 /* Initialization, Detach, Reset */
 const char *ath9k_hw_probe(u16 vendorid, u16 devid);
 void ath9k_hw_detach(struct ath_hw *ah);

drivers/net/wireless/ath/ath9k/main.c

@@ -1489,6 +1489,47 @@ static int ath_init_btcoex_timer(struct ath_softc *sc)
 	return 0;
 }
 
+/*
+ * Read and write, they both share the same lock. We do this to serialize
+ * reads and writes on Atheros 802.11n PCI devices only. This is required
+ * as the FIFO on these devices can only accept sanely 2 requests. After
+ * that the device goes bananas. Serializing the reads/writes prevents this
+ * from happening.
+ */
+
+static void ath9k_iowrite32(void *hw_priv, u32 val, u32 reg_offset)
+{
+	struct ath_hw *ah = (struct ath_hw *) hw_priv;
+
+	if (ah->config.serialize_regmode == SER_REG_MODE_ON) {
+		unsigned long flags;
+		spin_lock_irqsave(&ah->ah_sc->sc_serial_rw, flags);
+		iowrite32(val, ah->ah_sc->mem + reg_offset);
+		spin_unlock_irqrestore(&ah->ah_sc->sc_serial_rw, flags);
+	} else
+		iowrite32(val, ah->ah_sc->mem + reg_offset);
+}
+
+static unsigned int ath9k_ioread32(void *hw_priv, u32 reg_offset)
+{
+	struct ath_hw *ah = (struct ath_hw *) hw_priv;
+	u32 val;
+
+	if (ah->config.serialize_regmode == SER_REG_MODE_ON) {
+		unsigned long flags;
+		spin_lock_irqsave(&ah->ah_sc->sc_serial_rw, flags);
+		val = ioread32(ah->ah_sc->mem + reg_offset);
+		spin_unlock_irqrestore(&ah->ah_sc->sc_serial_rw, flags);
+	} else
+		val = ioread32(ah->ah_sc->mem + reg_offset);
+	return val;
+}
+
+static struct ath_ops ath9k_common_ops = {
+	.read = ath9k_ioread32,
+	.write = ath9k_iowrite32,
+};
+
 /*
  * Initialize and fill ath_softc, ath_sofct is the
  * "Software Carrier" struct. Historically it has existed
@@ -1528,6 +1569,7 @@ static int ath_init_softc(u16 devid, struct ath_softc *sc, u16 subsysid)
 	sc->sc_ah = ah;
 
 	common = ath9k_hw_common(ah);
+	common->ops = &ath9k_common_ops;
 
 	/*
 	 * Cache line size is used to size and align various