ath9k: add MAC revision detection for AR9330

The AR9330 1.0 and 1.1 are using the same revision,
thus it is not possible to distinguish the two chips.
The platform setup code can distinguish the chips based
on the SoC revision.

Add a callback function to ath9k_platform_data in order
to allow getting the revision number from the platform code.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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

@@ -251,6 +251,15 @@ static void ath9k_hw_read_revisions(struct ath_hw *ah)
 	case AR5416_AR9100_DEVID:
 		ah->hw_version.macVersion = AR_SREV_VERSION_9100;
 		break;
+	case AR9300_DEVID_AR9330:
+		ah->hw_version.macVersion = AR_SREV_VERSION_9330;
+		if (ah->get_mac_revision) {
+			ah->hw_version.macRev = ah->get_mac_revision();
+		} else {
+			val = REG_READ(ah, AR_SREV);
+			ah->hw_version.macRev = MS(val, AR_SREV_REVISION2);
+		}
+		return;
 	case AR9300_DEVID_AR9340:
 		ah->hw_version.macVersion = AR_SREV_VERSION_9340;
 		val = REG_READ(ah, AR_SREV);

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

@@ -862,6 +862,7 @@ struct ath_hw {
 	u32 ent_mode;
 
 	bool is_clk_25mhz;
+	int (*get_mac_revision)(void);
 };
 
 struct ath_bus_ops {

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

@@ -574,6 +574,7 @@ static int ath9k_init_softc(u16 devid, struct ath_softc *sc, u16 subsysid,
 		sc->sc_ah->gpio_val = pdata->gpio_val;
 		sc->sc_ah->led_pin = pdata->led_pin;
 		ah->is_clk_25mhz = pdata->is_clk_25mhz;
+		ah->get_mac_revision = pdata->get_mac_revision;
 	}
 
 	common = ath9k_hw_common(ah);

include/linux/ath9k_platform.h

@@ -30,6 +30,7 @@ struct ath9k_platform_data {
 	u32 gpio_val;
 
 	bool is_clk_25mhz;
+	int (*get_mac_revision)(void);
 };
 
 #endif /* _LINUX_ATH9K_PLATFORM_H */