sfc: Use generic MDIO functions and definitions

Make use of the newly-added generic MDIO clause 45 support and remove
redundant definitions.

Add an 'efx_' prefix to the remaining driver-specific MDIO functions
and remove arguments which are redundant with efx->mdio.prtad.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/sfc/Kconfig

@@ -1,7 +1,7 @@
 config SFC
 	tristate "Solarflare Solarstorm SFC4000 support"
 	depends on PCI && INET
-	select MII
+	select MDIO
 	select CRC32
 	select I2C
 	select I2C_ALGOBIT

drivers/net/sfc/efx.c

@@ -1300,10 +1300,16 @@ static void efx_monitor(struct work_struct *data)
 static int efx_ioctl(struct net_device *net_dev, struct ifreq *ifr, int cmd)
 {
 	struct efx_nic *efx = netdev_priv(net_dev);
+	struct mii_ioctl_data *data = if_mii(ifr);
 
 	EFX_ASSERT_RESET_SERIALISED(efx);
 
-	return generic_mii_ioctl(&efx->mii, if_mii(ifr), cmd, NULL);
+	/* Convert phy_id from older PRTAD/DEVAD format */
+	if ((cmd == SIOCGMIIREG || cmd == SIOCSMIIREG) &&
+	    (data->phy_id & 0xfc00) == 0x0400)
+		data->phy_id ^= MDIO_PHY_ID_C45 | 0x0400;
+
+	return mdio_mii_ioctl(&efx->mdio, data, cmd);
 }
 
 /**************************************************************************
@@ -1945,7 +1951,7 @@ static int efx_init_struct(struct efx_nic *efx, struct efx_nic_type *type,
 	mutex_init(&efx->mac_lock);
 	efx->mac_op = &efx_dummy_mac_operations;
 	efx->phy_op = &efx_dummy_phy_operations;
-	efx->mii.dev = net_dev;
+	efx->mdio.dev = net_dev;
 	INIT_WORK(&efx->phy_work, efx_phy_work);
 	INIT_WORK(&efx->mac_work, efx_mac_work);
 	atomic_set(&efx->netif_stop_count, 1);

drivers/net/sfc/ethtool.c

@@ -10,6 +10,7 @@
 
 #include <linux/netdevice.h>
 #include <linux/ethtool.h>
+#include <linux/mdio.h>
 #include <linux/rtnetlink.h>
 #include "net_driver.h"
 #include "workarounds.h"
@@ -345,8 +346,8 @@ static int efx_ethtool_fill_self_tests(struct efx_nic *efx,
 	unsigned int n = 0, i;
 	enum efx_loopback_mode mode;
 
-	efx_fill_test(n++, strings, data, &tests->mii,
-		      "core", 0, "mii", NULL);
+	efx_fill_test(n++, strings, data, &tests->mdio,
+		      "core", 0, "mdio", NULL);
 	efx_fill_test(n++, strings, data, &tests->nvram,
 		      "core", 0, "nvram", NULL);
 	efx_fill_test(n++, strings, data, &tests->interrupt,
@@ -529,14 +530,7 @@ static int efx_ethtool_nway_reset(struct net_device *net_dev)
 {
 	struct efx_nic *efx = netdev_priv(net_dev);
 
-	if (efx->phy_op->mmds & DEV_PRESENT_BIT(MDIO_MMD_AN)) {
-		mdio_clause45_set_flag(efx, efx->mii.phy_id, MDIO_MMD_AN,
-				       MDIO_MMDREG_CTRL1,
-				       __ffs(BMCR_ANRESTART), true);
-		return 0;
-	}
-
-	return -EOPNOTSUPP;
+	return mdio45_nway_restart(&efx->mdio);
 }
 
 static u32 efx_ethtool_get_link(struct net_device *net_dev)
@@ -689,7 +683,7 @@ static int efx_ethtool_set_pauseparam(struct net_device *net_dev,
 		return -EINVAL;
 	}
 
-	if (!(efx->phy_op->mmds & DEV_PRESENT_BIT(MDIO_MMD_AN)) &&
+	if (!(efx->phy_op->mmds & MDIO_DEVS_AN) &&
 	    (wanted_fc & EFX_FC_AUTO)) {
 		EFX_LOG(efx, "PHY does not support flow control "
 			"autonegotiation\n");
@@ -717,7 +711,7 @@ static int efx_ethtool_set_pauseparam(struct net_device *net_dev,
 	mutex_lock(&efx->mac_lock);
 
 	efx->wanted_fc = wanted_fc;
-	mdio_clause45_set_pause(efx);
+	efx_mdio_set_pause(efx);
 	__efx_reconfigure_port(efx);
 
 	mutex_unlock(&efx->mac_lock);

drivers/net/sfc/falcon.c

@@ -2063,26 +2063,6 @@ int falcon_dma_stats(struct efx_nic *efx, unsigned int done_offset)
  **************************************************************************
  */
 
-/* Use the top bit of the MII PHY id to indicate the PHY type
- * (1G/10G), with the remaining bits as the actual PHY id.
- *
- * This allows us to avoid leaking information from the mii_if_info
- * structure into other data structures.
- */
-#define FALCON_PHY_ID_ID_WIDTH  EFX_WIDTH(MD_PRT_DEV_ADR)
-#define FALCON_PHY_ID_ID_MASK   ((1 << FALCON_PHY_ID_ID_WIDTH) - 1)
-#define FALCON_PHY_ID_WIDTH     (FALCON_PHY_ID_ID_WIDTH + 1)
-#define FALCON_PHY_ID_MASK      ((1 << FALCON_PHY_ID_WIDTH) - 1)
-#define FALCON_PHY_ID_10G       (1 << (FALCON_PHY_ID_WIDTH - 1))
-
-
-/* Packing the clause 45 port and device fields into a single value */
-#define MD_PRT_ADR_COMP_LBN   (MD_PRT_ADR_LBN - MD_DEV_ADR_LBN)
-#define MD_PRT_ADR_COMP_WIDTH  MD_PRT_ADR_WIDTH
-#define MD_DEV_ADR_COMP_LBN    0
-#define MD_DEV_ADR_COMP_WIDTH  MD_DEV_ADR_WIDTH
-
-
 /* Wait for GMII access to complete */
 static int falcon_gmii_wait(struct efx_nic *efx)
 {
@@ -2108,49 +2088,29 @@ static int falcon_gmii_wait(struct efx_nic *efx)
 	return -ETIMEDOUT;
 }
 
-/* Writes a GMII register of a PHY connected to Falcon using MDIO. */
-static void falcon_mdio_write(struct net_device *net_dev, int phy_id,
-			      int addr, int value)
+/* Write an MDIO register of a PHY connected to Falcon. */
+static int falcon_mdio_write(struct net_device *net_dev,
+			     int prtad, int devad, u16 addr, u16 value)
 {
 	struct efx_nic *efx = netdev_priv(net_dev);
-	unsigned int phy_id2 = phy_id & FALCON_PHY_ID_ID_MASK;
 	efx_oword_t reg;
+	int rc;
 
-	/* The 'generic' prt/dev packing in mdio_10g.h is conveniently
-	 * chosen so that the only current user, Falcon, can take the
-	 * packed value and use them directly.
-	 * Fail to build if this assumption is broken.
-	 */
-	BUILD_BUG_ON(FALCON_PHY_ID_10G != MDIO45_XPRT_ID_IS10G);
-	BUILD_BUG_ON(FALCON_PHY_ID_ID_WIDTH != MDIO45_PRT_DEV_WIDTH);
-	BUILD_BUG_ON(MD_PRT_ADR_COMP_LBN != MDIO45_PRT_ID_COMP_LBN);
-	BUILD_BUG_ON(MD_DEV_ADR_COMP_LBN != MDIO45_DEV_ID_COMP_LBN);
-
-	if (phy_id2 == PHY_ADDR_INVALID)
-		return;
-
-	/* See falcon_mdio_read for an explanation. */
-	if (!(phy_id & FALCON_PHY_ID_10G)) {
-		int mmd = ffs(efx->phy_op->mmds) - 1;
-		EFX_TRACE(efx, "Fixing erroneous clause22 write\n");
-		phy_id2 = mdio_clause45_pack(phy_id2, mmd)
-			& FALCON_PHY_ID_ID_MASK;
-	}
-
-	EFX_REGDUMP(efx, "writing GMII %d register %02x with %04x\n", phy_id,
-		    addr, value);
+	EFX_REGDUMP(efx, "writing MDIO %d register %d.%d with 0x%04x\n",
+		    prtad, devad, addr, value);
 
 	spin_lock_bh(&efx->phy_lock);
 
-	/* Check MII not currently being accessed */
-	if (falcon_gmii_wait(efx) != 0)
+	/* Check MDIO not currently being accessed */
+	rc = falcon_gmii_wait(efx);
+	if (rc)
 		goto out;
 
 	/* Write the address/ID register */
 	EFX_POPULATE_OWORD_1(reg, MD_PHY_ADR, addr);
 	falcon_write(efx, &reg, MD_PHY_ADR_REG_KER);
 
-	EFX_POPULATE_OWORD_1(reg, MD_PRT_DEV_ADR, phy_id2);
+	EFX_POPULATE_OWORD_2(reg, MD_PRT_ADR, prtad, MD_DEV_ADR, devad);
 	falcon_write(efx, &reg, MD_ID_REG_KER);
 
 	/* Write data */
@@ -2163,7 +2123,8 @@ static void falcon_mdio_write(struct net_device *net_dev, int phy_id,
 	falcon_write(efx, &reg, MD_CS_REG_KER);
 
 	/* Wait for data to be written */
-	if (falcon_gmii_wait(efx) != 0) {
+	rc = falcon_gmii_wait(efx);
+	if (rc) {
 		/* Abort the write operation */
 		EFX_POPULATE_OWORD_2(reg,
 				     MD_WRC, 0,
@@ -2174,81 +2135,55 @@ static void falcon_mdio_write(struct net_device *net_dev, int phy_id,
 
  out:
 	spin_unlock_bh(&efx->phy_lock);
+	return rc;
 }
 
-/* Reads a GMII register from a PHY connected to Falcon.  If no value
- * could be read, -1 will be returned. */
-static int falcon_mdio_read(struct net_device *net_dev, int phy_id, int addr)
+/* Read an MDIO register of a PHY connected to Falcon. */
+static int falcon_mdio_read(struct net_device *net_dev,
+			    int prtad, int devad, u16 addr)
 {
 	struct efx_nic *efx = netdev_priv(net_dev);
-	unsigned int phy_addr = phy_id & FALCON_PHY_ID_ID_MASK;
 	efx_oword_t reg;
-	int value = -1;
-
-	if (phy_addr == PHY_ADDR_INVALID)
-		return -1;
-
-	/* Our PHY code knows whether it needs to talk clause 22(1G) or 45(10G)
-	 * but the generic Linux code does not make any distinction or have
-	 * any state for this.
-	 * We spot the case where someone tried to talk 22 to a 45 PHY and
-	 * redirect the request to the lowest numbered MMD as a clause45
-	 * request. This is enough to allow simple queries like id and link
-	 * state to succeed. TODO: We may need to do more in future.
-	 */
-	if (!(phy_id & FALCON_PHY_ID_10G)) {
-		int mmd = ffs(efx->phy_op->mmds) - 1;
-		EFX_TRACE(efx, "Fixing erroneous clause22 read\n");
-		phy_addr = mdio_clause45_pack(phy_addr, mmd)
-			& FALCON_PHY_ID_ID_MASK;
-	}
+	int rc;
 
 	spin_lock_bh(&efx->phy_lock);
 
-	/* Check MII not currently being accessed */
-	if (falcon_gmii_wait(efx) != 0)
+	/* Check MDIO not currently being accessed */
+	rc = falcon_gmii_wait(efx);
+	if (rc)
 		goto out;
 
 	EFX_POPULATE_OWORD_1(reg, MD_PHY_ADR, addr);
 	falcon_write(efx, &reg, MD_PHY_ADR_REG_KER);
 
-	EFX_POPULATE_OWORD_1(reg, MD_PRT_DEV_ADR, phy_addr);
+	EFX_POPULATE_OWORD_2(reg, MD_PRT_ADR, prtad, MD_DEV_ADR, devad);
 	falcon_write(efx, &reg, MD_ID_REG_KER);
 
 	/* Request data to be read */
 	EFX_POPULATE_OWORD_2(reg, MD_RDC, 1, MD_GC, 0);
 	falcon_write(efx, &reg, MD_CS_REG_KER);
 
 	/* Wait for data to become available */
-	value = falcon_gmii_wait(efx);
-	if (value == 0) {
+	rc = falcon_gmii_wait(efx);
+	if (rc == 0) {
 		falcon_read(efx, &reg, MD_RXD_REG_KER);
-		value = EFX_OWORD_FIELD(reg, MD_RXD);
-		EFX_REGDUMP(efx, "read from GMII %d register %02x, got %04x\n",
-			    phy_id, addr, value);
+		rc = EFX_OWORD_FIELD(reg, MD_RXD);
+		EFX_REGDUMP(efx, "read from MDIO %d register %d.%d, got %04x\n",
+			    prtad, devad, addr, rc);
 	} else {
 		/* Abort the read operation */
 		EFX_POPULATE_OWORD_2(reg,
 				     MD_RIC, 0,
 				     MD_GC, 1);
 		falcon_write(efx, &reg, MD_CS_REG_KER);
 
-		EFX_LOG(efx, "read from GMII 0x%x register %02x, got "
-			"error %d\n", phy_id, addr, value);
+		EFX_LOG(efx, "read from MDIO %d register %d.%d, got error %d\n",
+			prtad, devad, addr, rc);
 	}
 
  out:
 	spin_unlock_bh(&efx->phy_lock);
-
-	return value;
-}
-
-static void falcon_init_mdio(struct mii_if_info *gmii)
-{
-	gmii->mdio_read = falcon_mdio_read;
-	gmii->mdio_write = falcon_mdio_write;
-	gmii->phy_id_mask = FALCON_PHY_ID_MASK;
-	gmii->reg_num_mask = ((1 << EFX_WIDTH(MD_PHY_ADR)) - 1);
+	return rc;
 }
 
 static int falcon_probe_phy(struct efx_nic *efx)
@@ -2342,9 +2277,11 @@ int falcon_probe_port(struct efx_nic *efx)
 	if (rc)
 		return rc;
 
-	/* Set up GMII structure for PHY */
-	efx->mii.supports_gmii = true;
-	falcon_init_mdio(&efx->mii);
+	/* Set up MDIO structure for PHY */
+	efx->mdio.mmds = efx->phy_op->mmds;
+	efx->mdio.mode_support = MDIO_SUPPORTS_C45 | MDIO_EMULATE_C22;
+	efx->mdio.mdio_read = falcon_mdio_read;
+	efx->mdio.mdio_write = falcon_mdio_write;
 
 	/* Hardware flow ctrl. FalconA RX FIFO too small for pause generation */
 	if (falcon_rev(efx) >= FALCON_REV_B0)
@@ -2761,7 +2698,7 @@ static int falcon_probe_nvconfig(struct efx_nic *efx)
 	if (rc == -EINVAL) {
 		EFX_ERR(efx, "NVRAM is invalid therefore using defaults\n");
 		efx->phy_type = PHY_TYPE_NONE;
-		efx->mii.phy_id = PHY_ADDR_INVALID;
+		efx->mdio.prtad = MDIO_PRTAD_NONE;
 		board_rev = 0;
 		rc = 0;
 	} else if (rc) {
@@ -2771,7 +2708,7 @@ static int falcon_probe_nvconfig(struct efx_nic *efx)
 		struct falcon_nvconfig_board_v3 *v3 = &nvconfig->board_v3;
 
 		efx->phy_type = v2->port0_phy_type;
-		efx->mii.phy_id = v2->port0_phy_addr;
+		efx->mdio.prtad = v2->port0_phy_addr;
 		board_rev = le16_to_cpu(v2->board_revision);
 
 		if (le16_to_cpu(nvconfig->board_struct_ver) >= 3) {
@@ -2793,7 +2730,7 @@ static int falcon_probe_nvconfig(struct efx_nic *efx)
 	/* Read the MAC addresses */
 	memcpy(efx->mac_address, nvconfig->mac_address[0], ETH_ALEN);
 
-	EFX_LOG(efx, "PHY is %d phy_id %d\n", efx->phy_type, efx->mii.phy_id);
+	EFX_LOG(efx, "PHY is %d phy_id %d\n", efx->phy_type, efx->mdio.prtad);
 
 	efx_set_board_info(efx, board_rev);
 

drivers/net/sfc/falcon_hwdefs.h

@@ -456,9 +456,6 @@
 #define MD_PRT_ADR_WIDTH 5
 #define MD_DEV_ADR_LBN 6
 #define MD_DEV_ADR_WIDTH 5
-/* Used for writing both at once */
-#define MD_PRT_DEV_ADR_LBN 6
-#define MD_PRT_DEV_ADR_WIDTH 10
 
 /* PHY management status & mask register (DWORD read only) */
 #define MD_STAT_REG_KER 0xc50

drivers/net/sfc/falcon_xmac.c

@@ -133,7 +133,7 @@ bool falcon_xaui_link_ok(struct efx_nic *efx)
 	/* If the link is up, then check the phy side of the xaui link */
 	if (efx->link_up && link_ok)
 		if (efx->phy_op->mmds & (1 << MDIO_MMD_PHYXS))
-			link_ok = mdio_clause45_phyxgxs_lane_sync(efx);
+			link_ok = efx_mdio_phyxgxs_lane_sync(efx);
 
 	return link_ok;
 }