net: phy: aquantia: report PHY details like firmware version

Add reporting firmware details. These details are available only once
the firmware has finished initializing the chip. This can take some
time and we need to poll for init completion.

v2:
- Propagate timeout in aqr107_wait_reset_complete(). Don't bail out
  completely on timeout because chip may be functional even w/o
  firmware image.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/aquantia_main.c

@@ -70,6 +70,14 @@
 #define MDIO_AN_RX_VEND_STAT3_AFR		BIT(0)
 
 /* Vendor specific 1, MDIO_MMD_VEND1 */
+#define VEND1_GLOBAL_FW_ID			0x0020
+#define VEND1_GLOBAL_FW_ID_MAJOR		GENMASK(15, 8)
+#define VEND1_GLOBAL_FW_ID_MINOR		GENMASK(7, 0)
+
+#define VEND1_GLOBAL_RSVD_STAT1			0xc885
+#define VEND1_GLOBAL_RSVD_STAT1_FW_BUILD_ID	GENMASK(7, 4)
+#define VEND1_GLOBAL_RSVD_STAT1_PROV_ID		GENMASK(3, 0)
+
 #define VEND1_GLOBAL_INT_STD_STATUS		0xfc00
 #define VEND1_GLOBAL_INT_VEND_STATUS		0xfc01
 
@@ -330,14 +338,64 @@ static int aqr107_set_tunable(struct phy_device *phydev,
 	}
 }
 
+/* If we configure settings whilst firmware is still initializing the chip,
+ * then these settings may be overwritten. Therefore make sure chip
+ * initialization has completed. Use presence of the firmware ID as
+ * indicator for initialization having completed.
+ * The chip also provides a "reset completed" bit, but it's cleared after
+ * read. Therefore function would time out if called again.
+ */
+static int aqr107_wait_reset_complete(struct phy_device *phydev)
+{
+	int val, retries = 100;
+
+	do {
+		val = phy_read_mmd(phydev, MDIO_MMD_VEND1, VEND1_GLOBAL_FW_ID);
+		if (val < 0)
+			return val;
+		msleep(20);
+	} while (!val && --retries);
+
+	return val ? 0 : -ETIMEDOUT;
+}
+
+static void aqr107_chip_info(struct phy_device *phydev)
+{
+	u8 fw_major, fw_minor, build_id, prov_id;
+	int val;
+
+	val = phy_read_mmd(phydev, MDIO_MMD_VEND1, VEND1_GLOBAL_FW_ID);
+	if (val < 0)
+		return;
+
+	fw_major = FIELD_GET(VEND1_GLOBAL_FW_ID_MAJOR, val);
+	fw_minor = FIELD_GET(VEND1_GLOBAL_FW_ID_MINOR, val);
+
+	val = phy_read_mmd(phydev, MDIO_MMD_VEND1, VEND1_GLOBAL_RSVD_STAT1);
+	if (val < 0)
+		return;
+
+	build_id = FIELD_GET(VEND1_GLOBAL_RSVD_STAT1_FW_BUILD_ID, val);
+	prov_id = FIELD_GET(VEND1_GLOBAL_RSVD_STAT1_PROV_ID, val);
+
+	phydev_dbg(phydev, "FW %u.%u, Build %u, Provisioning %u\n",
+		   fw_major, fw_minor, build_id, prov_id);
+}
+
 static int aqr107_config_init(struct phy_device *phydev)
 {
+	int ret;
+
 	/* Check that the PHY interface type is compatible */
 	if (phydev->interface != PHY_INTERFACE_MODE_SGMII &&
 	    phydev->interface != PHY_INTERFACE_MODE_2500BASEX &&
 	    phydev->interface != PHY_INTERFACE_MODE_10GKR)
 		return -ENODEV;
 
+	ret = aqr107_wait_reset_complete(phydev);
+	if (!ret)
+		aqr107_chip_info(phydev);
+
 	/* ensure that a latched downshift event is cleared */
 	aqr107_read_downshift_event(phydev);
 
@@ -353,6 +411,10 @@ static int aqcs109_config_init(struct phy_device *phydev)
 	    phydev->interface != PHY_INTERFACE_MODE_2500BASEX)
 		return -ENODEV;
 
+	ret = aqr107_wait_reset_complete(phydev);
+	if (!ret)
+		aqr107_chip_info(phydev);
+
 	/* AQCS109 belongs to a chip family partially supporting 10G and 5G.
 	 * PMA speed ability bits are the same for all members of the family,
 	 * AQCS109 however supports speeds up to 2.5G only.