ath5k: Add a function to read chipset's MAC revision

Add bus dependent revision read function which is used to
determine chipset's MAC before hardware is initialized.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Wojciech Dubowik <Wojciech.Dubowik@neratec.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath5k/ath5k.h

@@ -1046,6 +1046,7 @@ struct ath5k_hw {
 	u32			ah_phy;
 	u32			ah_mac_srev;
 	u16			ah_mac_version;
+	u16			ah_mac_revision;
 	u16			ah_phy_revision;
 	u16			ah_radio_5ghz_revision;
 	u16			ah_radio_2ghz_revision;
@@ -1156,8 +1157,9 @@ void ath5k_hw_deinit(struct ath5k_hw *ah);
 int ath5k_sysfs_register(struct ath5k_softc *sc);
 void ath5k_sysfs_unregister(struct ath5k_softc *sc);
 
-/*Chip id helper function */
+/*Chip id helper functions */
 const char *ath5k_chip_name(enum ath5k_srev_type type, u_int16_t val);
+int ath5k_hw_read_srev(struct ath5k_hw *ah);
 
 /* LED functions */
 int ath5k_init_leds(struct ath5k_softc *sc);

drivers/net/wireless/ath/ath5k/attach.c

@@ -128,7 +128,8 @@ int ath5k_hw_init(struct ath5k_softc *sc)
 	/*
 	 * Find the mac version
 	 */
-	srev = ath5k_hw_reg_read(ah, AR5K_SREV);
+	ath5k_hw_read_srev(ah);
+	srev = ah->ah_mac_srev;
 	if (srev < AR5K_SREV_AR5311)
 		ah->ah_version = AR5K_AR5210;
 	else if (srev < AR5K_SREV_AR5212)
@@ -136,6 +137,10 @@ int ath5k_hw_init(struct ath5k_softc *sc)
 	else
 		ah->ah_version = AR5K_AR5212;
 
+	/* Get the MAC revision */
+	ah->ah_mac_version = AR5K_REG_MS(srev, AR5K_SREV_VER);
+	ah->ah_mac_revision = AR5K_REG_MS(srev, AR5K_SREV_REV);
+
 	/* Fill the ath5k_hw struct with the needed functions */
 	ret = ath5k_hw_init_desc_functions(ah);
 	if (ret)
@@ -146,9 +151,7 @@ int ath5k_hw_init(struct ath5k_softc *sc)
 	if (ret)
 		goto err;
 
-	/* Get MAC, PHY and RADIO revisions */
-	ah->ah_mac_srev = srev;
-	ah->ah_mac_version = AR5K_REG_MS(srev, AR5K_SREV_VER);
+	/* Get PHY and RADIO revisions */
 	ah->ah_phy_revision = ath5k_hw_reg_read(ah, AR5K_PHY_CHIP_ID) &
 			0xffffffff;
 	ah->ah_radio_5ghz_revision = ath5k_hw_radio_revision(ah,

drivers/net/wireless/ath/ath5k/pci.c

@@ -100,6 +100,12 @@ bool ath5k_pci_eeprom_read(struct ath_common *common, u32 offset, u16 *data)
 	return -ETIMEDOUT;
 }
 
+int ath5k_hw_read_srev(struct ath5k_hw *ah)
+{
+	ah->ah_mac_srev = ath5k_hw_reg_read(ah, AR5K_SREV);
+	return 0;
+}
+
 /* Common ath_bus_opts structure */
 static const struct ath_bus_ops ath_pci_bus_ops = {
 	.ath_bus_type = ATH_PCI,