Merge branch 'broadcom-phy-internal-counters'

Florian Fainelli says:

====================
net: phy: broadcom: Support for PHY counters

This patch series adds support for reading the Broadcom PHYs internal counters.

Changes in v3:

- fixed the allocation of priv->stats in bcm7xxx

Changes in v2:

- fixed modular build reported by kbuild

- constify array of stats
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 113 insertions, 0 deletions

diff --git a/drivers/net/phy/bcm-phy-lib.c b/drivers/net/phy/bcm-phy-lib.c
index 3156ce6d5861..ab9ad689617c 100644
--- a/drivers/net/phy/bcm-phy-lib.c
+++ b/drivers/net/phy/bcm-phy-lib.c
@@ -17,6 +17,7 @@
 #include <linux/mdio.h>
 #include <linux/module.h>
 #include <linux/phy.h>
+#include <linux/ethtool.h>
 
 #define MII_BCM_CHANNEL_WIDTH     0x2000
 #define BCM_CL45VEN_EEE_ADV       0x3c
@@ -317,6 +318,75 @@ int bcm_phy_downshift_set(struct phy_device *phydev, u8 count)
 }
 EXPORT_SYMBOL_GPL(bcm_phy_downshift_set);
 
+struct bcm_phy_hw_stat {
+	const char *string;
+	u8 reg;
+	u8 shift;
+	u8 bits;
+};
+
+/* Counters freeze at either 0xffff or 0xff, better than nothing */
+static const struct bcm_phy_hw_stat bcm_phy_hw_stats[] = {
+	{ "phy_receive_errors", MII_BRCM_CORE_BASE12, 0, 16 },
+	{ "phy_serdes_ber_errors", MII_BRCM_CORE_BASE13, 8, 8 },
+	{ "phy_false_carrier_sense_errors", MII_BRCM_CORE_BASE13, 0, 8 },
+	{ "phy_local_rcvr_nok", MII_BRCM_CORE_BASE14, 8, 8 },
+	{ "phy_remote_rcv_nok", MII_BRCM_CORE_BASE14, 0, 8 },
+};
+
+int bcm_phy_get_sset_count(struct phy_device *phydev)
+{
+	return ARRAY_SIZE(bcm_phy_hw_stats);
+}
+EXPORT_SYMBOL_GPL(bcm_phy_get_sset_count);
+
+void bcm_phy_get_strings(struct phy_device *phydev, u8 *data)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(bcm_phy_hw_stats); i++)
+		memcpy(data + i * ETH_GSTRING_LEN,
+		       bcm_phy_hw_stats[i].string, ETH_GSTRING_LEN);
+}
+EXPORT_SYMBOL_GPL(bcm_phy_get_strings);
+
+#ifndef UINT64_MAX
+#define UINT64_MAX              (u64)(~((u64)0))
+#endif
+
+/* Caller is supposed to provide appropriate storage for the library code to
+ * access the shadow copy
+ */
+static u64 bcm_phy_get_stat(struct phy_device *phydev, u64 *shadow,
+			    unsigned int i)
+{
+	struct bcm_phy_hw_stat stat = bcm_phy_hw_stats[i];
+	int val;
+	u64 ret;
+
+	val = phy_read(phydev, stat.reg);
+	if (val < 0) {
+		ret = UINT64_MAX;
+	} else {
+		val >>= stat.shift;
+		val = val & ((1 << stat.bits) - 1);
+		shadow[i] += val;
+		ret = shadow[i];
+	}
+
+	return ret;
+}
+
+void bcm_phy_get_stats(struct phy_device *phydev, u64 *shadow,
+		       struct ethtool_stats *stats, u64 *data)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(bcm_phy_hw_stats); i++)
+		data[i] = bcm_phy_get_stat(phydev, shadow, i);
+}
+EXPORT_SYMBOL_GPL(bcm_phy_get_stats);
+
 MODULE_DESCRIPTION("Broadcom PHY Library");
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Broadcom Corporation");
diff --git a/drivers/net/phy/bcm-phy-lib.h b/drivers/net/phy/bcm-phy-lib.h
index a117f657c6d7..7c73808cbbde 100644
--- a/drivers/net/phy/bcm-phy-lib.h
+++ b/drivers/net/phy/bcm-phy-lib.h
@@ -42,4 +42,9 @@ int bcm_phy_downshift_get(struct phy_device *phydev, u8 *count);
 
 int bcm_phy_downshift_set(struct phy_device *phydev, u8 count);
 
+int bcm_phy_get_sset_count(struct phy_device *phydev);
+void bcm_phy_get_strings(struct phy_device *phydev, u8 *data);
+void bcm_phy_get_stats(struct phy_device *phydev, u64 *shadow,
+		       struct ethtool_stats *stats, u64 *data);
+
 #endif /* _LINUX_BCM_PHY_LIB_H */
diff --git a/drivers/net/phy/bcm7xxx.c b/drivers/net/phy/bcm7xxx.c
index 5b3be4c67be8..aae00bde5980 100644
--- a/drivers/net/phy/bcm7xxx.c
+++ b/drivers/net/phy/bcm7xxx.c
@@ -45,6 +45,10 @@
 #define AFE_VDAC_OTHERS_0		MISC_ADDR(0x39, 3)
 #define AFE_HPF_TRIM_OTHERS		MISC_ADDR(0x3a, 0)
 
+struct bcm7xxx_phy_priv {
+	u64	*stats;
+};
+
 static void r_rc_cal_reset(struct phy_device *phydev)
 {
 	/* Reset R_CAL/RC_CAL Engine */
@@ -350,6 +354,33 @@ static int bcm7xxx_28nm_set_tunable(struct phy_device *phydev,
 	return genphy_restart_aneg(phydev);
 }
 
+static void bcm7xxx_28nm_get_phy_stats(struct phy_device *phydev,
+				       struct ethtool_stats *stats, u64 *data)
+{
+	struct bcm7xxx_phy_priv *priv = phydev->priv;
+
+	bcm_phy_get_stats(phydev, priv->stats, stats, data);
+}
+
+static int bcm7xxx_28nm_probe(struct phy_device *phydev)
+{
+	struct bcm7xxx_phy_priv *priv;
+
+	priv = devm_kzalloc(&phydev->mdio.dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	phydev->priv = priv;
+
+	priv->stats = devm_kcalloc(&phydev->mdio.dev,
+				   bcm_phy_get_sset_count(phydev), sizeof(u64),
+				   GFP_KERNEL);
+	if (!priv->stats)
+		return -ENOMEM;
+
+	return 0;
+}
+
 #define BCM7XXX_28NM_GPHY(_oui, _name)					\
 {									\
 	.phy_id		= (_oui),					\
@@ -364,6 +395,10 @@ static int bcm7xxx_28nm_set_tunable(struct phy_device *phydev,
 	.resume		= bcm7xxx_28nm_resume,				\
 	.get_tunable	= bcm7xxx_28nm_get_tunable,			\
 	.set_tunable	= bcm7xxx_28nm_set_tunable,			\
+	.get_sset_count	= bcm_phy_get_sset_count,			\
+	.get_strings	= bcm_phy_get_strings,				\
+	.get_stats	= bcm7xxx_28nm_get_phy_stats,			\
+	.probe		= bcm7xxx_28nm_probe,				\
 }
 
 #define BCM7XXX_40NM_EPHY(_oui, _name)					\
diff --git a/include/linux/brcmphy.h b/include/linux/brcmphy.h
index f9f8aaf9c943..4f7d8be9ddbf 100644
--- a/include/linux/brcmphy.h
+++ b/include/linux/brcmphy.h
@@ -244,6 +244,9 @@
 #define LPI_FEATURE_EN_DIG1000X		0x4000
 
 /* Core register definitions*/
+#define MII_BRCM_CORE_BASE12	0x12
+#define MII_BRCM_CORE_BASE13	0x13
+#define MII_BRCM_CORE_BASE14	0x14
 #define MII_BRCM_CORE_BASE1E	0x1E
 #define MII_BRCM_CORE_EXPB0	0xB0
 #define MII_BRCM_CORE_EXPB1	0xB1