[PATCH v2 0/3] net: phy: bcm5481x: add support for BroadR-Reach mode

[PATCH v2 0/3] net: phy: bcm5481x: add support for BroadR-Reach mode

[Kamil Horák - 2N]

PATCH 1 - Add the 1BR10 link mode and capability to switch to 
   BroadR-Reach as a PHY tunable value

PATCH 2 - Add the definitions of LRE registers, necessary to use
   BroadR-Reach modes on the BCM5481x PHY

PATCH 3 - Implementation of the BroadR-Reach modes for the Broadcom
   PHYs

Changes in v2:
  - Divided into multiple patches, removed useless link modes


Kamil Horák - 2N (3):
  net: phy: bcm54811: New link mode for BroadR-Reach
  net: phy: bcm54811: Add LRE registers definitions
  net: phy: bcm-phy-lib: Implement BroadR-Reach link modes

 drivers/net/phy/bcm-phy-lib.c | 122 ++++++++++++
 drivers/net/phy/bcm-phy-lib.h |   4 +
 drivers/net/phy/broadcom.c    | 336 ++++++++++++++++++++++++++++++++--
 drivers/net/phy/phy-core.c    |   9 +-
 include/linux/brcmphy.h       |  91 ++++++++-
 include/uapi/linux/ethtool.h  |   9 +-
 net/ethtool/common.c          |   7 +
 net/ethtool/ioctl.c           |   1 +
 8 files changed, 559 insertions(+), 20 deletions(-)

-- 
2.39.2

[PATCH v2 1/3] net: phy: bcm54811: New link mode for BroadR-Reach

[Kamil Horák - 2N]

Introduce new link modes necessary for the BroadR-Reach mode on
bcm5481x PHY by Broadcom and new PHY tunable to choose between
normal (IEEE) ethernet and BroadR-Reach modes of the PHY.

Signed-off-by: Kamil Horák - 2N <kamilh@axis.com>
---
 drivers/net/phy/phy-core.c   | 9 +++++----
 include/uapi/linux/ethtool.h | 9 ++++++++-
 net/ethtool/common.c         | 7 +++++++
 net/ethtool/ioctl.c          | 1 +
 4 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/drivers/net/phy/phy-core.c b/drivers/net/phy/phy-core.c
index 15f349e5995a..129e223d8985 100644
--- a/drivers/net/phy/phy-core.c
+++ b/drivers/net/phy/phy-core.c
@@ -13,10 +13,9 @@
  */
 const char *phy_speed_to_str(int speed)
 {
-	BUILD_BUG_ON_MSG(__ETHTOOL_LINK_MODE_MASK_NBITS != 102,
-		"Enum ethtool_link_mode_bit_indices and phylib are out of sync. "
-		"If a speed or mode has been added please update phy_speed_to_str "
-		"and the PHY settings array.\n");
+	BUILD_BUG_ON_MSG(__ETHTOOL_LINK_MODE_MASK_NBITS != 103,
+			 "Enum ethtool_link_mode_bit_indices and phylib are out of sync. If a speed or mode has been added please update phy_speed_to_str and the PHY settings array.\n"
+			);
 
 	switch (speed) {
 	case SPEED_10:
@@ -265,6 +264,8 @@ static const struct phy_setting settings[] = {
 	PHY_SETTING(     10, FULL,     10baseT1S_Full		),
 	PHY_SETTING(     10, HALF,     10baseT1S_Half		),
 	PHY_SETTING(     10, HALF,     10baseT1S_P2MP_Half	),
+	PHY_SETTING(     10, FULL,     1BR10			),
+
 };
 #undef PHY_SETTING
 
diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index 041e09c3515d..105432565e6d 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -289,11 +289,18 @@ struct ethtool_tunable {
 #define ETHTOOL_PHY_EDPD_NO_TX			0xfffe
 #define ETHTOOL_PHY_EDPD_DISABLE		0
 
+/*
+ *	BroadR-Reach Mode Control
+ */
+#define ETHTOOL_PHY_BRR_MODE_ON		1
+#define ETHTOOL_PHY_BRR_MODE_OFF	0
+
 enum phy_tunable_id {
 	ETHTOOL_PHY_ID_UNSPEC,
 	ETHTOOL_PHY_DOWNSHIFT,
 	ETHTOOL_PHY_FAST_LINK_DOWN,
 	ETHTOOL_PHY_EDPD,
+	ETHTOOL_PHY_BRR_MODE,
 	/*
 	 * Add your fresh new phy tunable attribute above and remember to update
 	 * phy_tunable_strings[] in net/ethtool/common.c
@@ -1845,7 +1852,7 @@ enum ethtool_link_mode_bit_indices {
 	ETHTOOL_LINK_MODE_10baseT1S_Full_BIT		 = 99,
 	ETHTOOL_LINK_MODE_10baseT1S_Half_BIT		 = 100,
 	ETHTOOL_LINK_MODE_10baseT1S_P2MP_Half_BIT	 = 101,
-
+	ETHTOOL_LINK_MODE_1BR10_BIT			 = 102,
 	/* must be last entry */
 	__ETHTOOL_LINK_MODE_MASK_NBITS
 };
diff --git a/net/ethtool/common.c b/net/ethtool/common.c
index 6b2a360dcdf0..5e37804958e9 100644
--- a/net/ethtool/common.c
+++ b/net/ethtool/common.c
@@ -98,6 +98,7 @@ phy_tunable_strings[__ETHTOOL_PHY_TUNABLE_COUNT][ETH_GSTRING_LEN] = {
 	[ETHTOOL_PHY_DOWNSHIFT]	= "phy-downshift",
 	[ETHTOOL_PHY_FAST_LINK_DOWN] = "phy-fast-link-down",
 	[ETHTOOL_PHY_EDPD]	= "phy-energy-detect-power-down",
+	[ETHTOOL_PHY_BRR_MODE]	= "phy-broadrreach-mode",
 };
 
 #define __LINK_MODE_NAME(speed, type, duplex) \
@@ -211,6 +212,7 @@ const char link_mode_names[][ETH_GSTRING_LEN] = {
 	__DEFINE_LINK_MODE_NAME(10, T1S, Full),
 	__DEFINE_LINK_MODE_NAME(10, T1S, Half),
 	__DEFINE_LINK_MODE_NAME(10, T1S_P2MP, Half),
+	__DEFINE_SPECIAL_MODE_NAME(1BR10, "1BR10"),
 };
 static_assert(ARRAY_SIZE(link_mode_names) == __ETHTOOL_LINK_MODE_MASK_NBITS);
 
@@ -374,6 +376,11 @@ const struct link_mode_info link_mode_params[] = {
 	__DEFINE_LINK_MODE_PARAMS(10, T1S, Full),
 	__DEFINE_LINK_MODE_PARAMS(10, T1S, Half),
 	__DEFINE_LINK_MODE_PARAMS(10, T1S_P2MP, Half),
+	[ETHTOOL_LINK_MODE_1BR10_BIT] = {
+		.speed	= SPEED_10,
+		.lanes  = 1,
+		.duplex = DUPLEX_FULL,
+	},
 };
 static_assert(ARRAY_SIZE(link_mode_params) == __ETHTOOL_LINK_MODE_MASK_NBITS);
 
diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index 5a55270aa86e..9e68c8562fa3 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -2722,6 +2722,7 @@ static int ethtool_phy_tunable_valid(const struct ethtool_tunable *tuna)
 	switch (tuna->id) {
 	case ETHTOOL_PHY_DOWNSHIFT:
 	case ETHTOOL_PHY_FAST_LINK_DOWN:
+	case ETHTOOL_PHY_BRR_MODE:
 		if (tuna->len != sizeof(u8) ||
 		    tuna->type_id != ETHTOOL_TUNABLE_U8)
 			return -EINVAL;
-- 
2.39.2

[PATCH v2 2/3] net: phy: bcm54811: Add LRE registers definitions

[Kamil Horák - 2N]

Add the definitions of LRE registers for Broadcom BCM5481x PHY
Signed-off-by: Kamil Horák - 2N <kamilh@axis.com>
---
 include/linux/brcmphy.h | 91 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 90 insertions(+), 1 deletion(-)

diff --git a/include/linux/brcmphy.h b/include/linux/brcmphy.h
index 1394ba302367..9c0b78c1b6fb 100644
--- a/include/linux/brcmphy.h
+++ b/include/linux/brcmphy.h
@@ -270,16 +270,105 @@
 #define BCM5482_SSD_SGMII_SLAVE		0x15	/* SGMII Slave Register */
 #define BCM5482_SSD_SGMII_SLAVE_EN	0x0002	/* Slave mode enable */
 #define BCM5482_SSD_SGMII_SLAVE_AD	0x0001	/* Slave auto-detection */
+#define BCM5482_SSD_SGMII_SLAVE_AD	0x0001	/* Slave auto-detection */
+
+/* BroadR-Reach LRE Registers. */
+#define MII_BCM54XX_LRECR		0x00	/* LRE Control Register                    */
+#define MII_BCM54XX_LRESR		0x01	/* LRE Status Register                     */
+#define MII_BCM54XX_LREPHYSID1		0x02	/* LRE PHYS ID 1                           */
+#define MII_BCM54XX_LREPHYSID2		0x03	/* LRE PHYS ID 2                           */
+#define MII_BCM54XX_LREANAA		0x04	/* LDS Auto-Negotiation Advertised Ability */
+#define MII_BCM54XX_LREANAC		0x05	/* LDS Auto-Negotiation Advertised Control */
+#define MII_BCM54XX_LREANPT		0x06	/* LDS Ability Next Page Transmit          */
+#define MII_BCM54XX_LRELPA		0x07	/* LDS Link Partner Ability                */
+#define MII_BCM54XX_LRELPNPM		0x08	/* LDS Link Partner Next Page Message      */
+#define MII_BCM54XX_LRELPNPC		0x09	/* LDS Link Partner Next Page Control      */
+#define MII_BCM54XX_LRELDSE		0x0a	/* LDS Expansion Register                  */
+#define MII_BCM54XX_LREES		0x0f	/* LRE Extended Status                     */
+
+/* LRE control register. */
+#define LRECR_RESET			0x8000	/* Reset to default state      */
+#define LRECR_LOOPBACK			0x4000	/* Internal Loopback           */
+#define LRECR_LDSRES			0x2000	/* Restart LDS Process         */
+#define LRECR_LDSEN			0x1000	/* LDS Enable                  */
+#define LRECR_PDOWN			0x0800	/* Enable low power state      */
+#define LRECR_ISOLATE			0x0400	/* Isolate data paths from MII */
+#define LRECR_SPEED100			0x0200	/* Select 100 Mbps             */
+#define LRECR_SPEED10			0x0000	/* Select 10 Mbps              */
+#define LRECR_4PAIRS			0x0020	/* Select 4 Pairs              */
+#define LRECR_2PAIRS			0x0010	/* Select 2 Pairs              */
+#define LRECR_1PAIR			0x0000	/* Select 1 Pair               */
+#define LRECR_MASTER			0x0008	/* Force Master when LDS disabled */
+#define LRECR_SLAVE			0x0000	/* Force Slave when LDS disabled  */
+
+/* LRE status register. */
+#define LRESR_ERCAP			0x0001	/* Ext-reg capability          */
+#define LRESR_JCD			0x0002	/* Jabber detected             */
+#define LRESR_LSTATUS			0x0004	/* Link status                 */
+#define LRESR_LDSABILITY		0x0008	/* Can do LDS                  */
+#define LRESR_8023			0x0010	/* Has IEEE 802.3 Support      */
+#define LRESR_LDSCOMPLETE		0x0020	/* LDS Auto-negotiation complete */
+#define LRESR_MFPS			0x0040	/* Can suppress Management Frames Preamble */
+#define LRESR_RESV			0x0080	/* Unused...                   */
+#define LRESR_ESTATEN			0x0100	/* Extended Status in R15      */
+#define LRESR_10_1PAIR			0x0200	/* Can do 10Mbps 1 Pair        */
+#define LRESR_10_2PAIR			0x0400	/* Can do 10Mbps 2 Pairs       */
+#define LRESR_100_2PAIR			0x0800	/* Can do 100Mbps 2 Pairs      */
+#define LRESR_100_4PAIR			0x1000	/* Can do 100Mbps 4 Pairs      */
+#define LRESR_100_1PAIR			0x2000	/* Can do 100Mbps 1 Pair       */
+
+/* LDS Auto-Negotiation Advertised Ability. */
+#define LREANAA_PAUSE_ASYM		0x8000	/* Can pause asymmetrically    */
+#define LREANAA_PAUSE			0x4000	/* Can pause                   */
+#define LREANAA_100_1PAIR		0x0020	/* Can do 100Mbps 1 Pair       */
+#define LREANAA_100_4PAIR		0x0010	/* Can do 100Mbps 4 Pair       */
+#define LREANAA_100_2PAIR		0x0008	/* Can do 100Mbps 2 Pair       */
+#define LREANAA_10_2PAIR		0x0004	/* Can do 10Mbps 2 Pair        */
+#define LREANAA_10_1PAIR		0x0002	/* Can do 10Mbps 1 Pair        */
+
+#define LRE_ADVERTISE_FULL		(LREANAA_100_1PAIR | LREANAA_100_4PAIR | \
+					 LREANAA_100_2PAIR | LREANAA_10_2PAIR | \
+					 LREANAA_10_1PAIR)
+
+#define LRE_ADVERTISE_ALL		LRE_ADVERTISE_FULL
+
+/* LDS Link Partner Ability. */
+#define LRELPA_PAUSE_ASYM		0x8000	/* Supports asymmetric pause   */
+#define LRELPA_PAUSE			0x4000	/* Supports pause capability   */
+#define LRELPA_100_1PAIR		0x0020	/* 100Mbps 1 Pair capable      */
+#define LRELPA_100_4PAIR		0x0010	/* 100Mbps 4 Pair capable      */
+#define LRELPA_100_2PAIR		0x0008	/* 100Mbps 2 Pair capable      */
+#define LRELPA_10_2PAIR			0x0004	/* 10Mbps 2 Pair capable       */
+#define LRELPA_10_1PAIR			0x0002	/* 10Mbps 1 Pair capable       */
+
+/* LDS Expansion register. */
+#define LDSE_DOWNGRADE			0x8000	/* Can do LDS Speed Downgrade  */
+#define LDSE_MASTER			0x4000	/* Master / Slave              */
+#define LDSE_PAIRS_MASK			0x3000	/* Pair Count Mask             */
+#define LDSE_4PAIRS			0x2000	/* 4 Pairs Connection          */
+#define LDSE_2PAIRS			0x1000	/* 2 Pairs Connection          */
+#define LDSE_1PAIR			0x0000	/* 1 Pair  Connection          */
+#define LDSE_CABLEN_MASK		0x0FFF	/* Cable Length Mask           */
 
 /* BCM54810 Registers */
 #define BCM54810_EXP_BROADREACH_LRE_MISC_CTL	(MII_BCM54XX_EXP_SEL_ER + 0x90)
 #define BCM54810_EXP_BROADREACH_LRE_MISC_CTL_EN	(1 << 0)
 #define BCM54810_SHD_CLK_CTL			0x3
 #define BCM54810_SHD_CLK_CTL_GTXCLK_EN		(1 << 9)
+#define BCM54810_SHD_SCR3_TRDDAPD		0x0100
+
+/* BCM54811 Registers */
+#define BCM54811_EXP_BROADREACH_LRE_OVERLAY_CTL	(MII_BCM54XX_EXP_SEL_ER + 0x9A)
+/* Access Control Override Enable */
+#define BCM54811_EXP_BROADREACH_LRE_OVERLAY_CTL_EN		BIT(15)
+/* Access Control Override Value */
+#define BCM54811_EXP_BROADREACH_LRE_OVERLAY_CTL_OVERRIDE_VAL	BIT(14)
+/* Access Control Value */
+#define BCM54811_EXP_BROADREACH_LRE_OVERLAY_CTL_VAL		BIT(13)
 
 /* BCM54612E Registers */
 #define BCM54612E_EXP_SPARE0		(MII_BCM54XX_EXP_SEL_ETC + 0x34)
-#define BCM54612E_LED4_CLK125OUT_EN	(1 << 1)
+#define BCM54612E_LED4_CLK125OUT_EN	BIT(1)
 
 
 /* Wake-on-LAN registers */
-- 
2.39.2

[PATCH v2 3/3] net: phy: bcm-phy-lib: Implement BroadR-Reach link modes

[Kamil Horák - 2N]

Implement single-pair BroadR-Reach modes on bcm5481x PHY by Broadcom.
Create set of functions alternative to IEEE 802.3 to handle configuration
of these modes on compatible Broadcom PHYs.

Signed-off-by: Kamil Horák - 2N <kamilh@axis.com>
---
 drivers/net/phy/bcm-phy-lib.c | 122 ++++++++++++
 drivers/net/phy/bcm-phy-lib.h |   4 +
 drivers/net/phy/broadcom.c    | 336 ++++++++++++++++++++++++++++++++--
 3 files changed, 448 insertions(+), 14 deletions(-)

diff --git a/drivers/net/phy/bcm-phy-lib.c b/drivers/net/phy/bcm-phy-lib.c
index 876f28fd8256..9fa2a20e641f 100644
--- a/drivers/net/phy/bcm-phy-lib.c
+++ b/drivers/net/phy/bcm-phy-lib.c
@@ -794,6 +794,46 @@ static int _bcm_phy_cable_test_get_status(struct phy_device *phydev,
 	return ret;
 }
 
+static int bcm_setup_forced(struct phy_device *phydev)
+{
+	u16 ctl = 0;
+
+	phydev->pause = 0;
+	phydev->asym_pause = 0;
+
+	if (phydev->speed == SPEED_100)
+		ctl |= LRECR_SPEED100;
+
+	if (phydev->duplex != DUPLEX_FULL)
+		return -EOPNOTSUPP;
+
+	return phy_modify(phydev, MII_BCM54XX_LRECR, LRECR_SPEED100, ctl);
+}
+
+/**
+ * bcm_linkmode_adv_to_mii_adv_t
+ * @advertising: the linkmode advertisement settings
+ *
+ * A small helper function that translates linkmode advertisement
+ * settings to phy autonegotiation advertisements for the
+ * MII_BCM54XX_LREANAA register.
+ */
+static inline u32 bcm_linkmode_adv_to_mii_adv_t(unsigned long *advertising)
+{
+	u32 result = 0;
+
+	if (linkmode_test_bit(ETHTOOL_LINK_MODE_1BR10_BIT, advertising))
+		result |= LREANAA_10_1PAIR;
+	if (linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT1_Full_BIT, advertising))
+		result |= LREANAA_100_1PAIR;
+	if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT, advertising))
+		result |= LRELPA_PAUSE;
+	if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, advertising))
+		result |= LRELPA_PAUSE_ASYM;
+
+	return result;
+}
+
 int bcm_phy_cable_test_start(struct phy_device *phydev)
 {
 	return _bcm_phy_cable_test_start(phydev, false);
@@ -1066,6 +1106,88 @@ int bcm_phy_led_brightness_set(struct phy_device *phydev,
 }
 EXPORT_SYMBOL_GPL(bcm_phy_led_brightness_set);
 
+int bcm_setup_master_slave(struct phy_device *phydev)
+{
+	u16 ctl = 0;
+
+	switch (phydev->master_slave_set) {
+	case MASTER_SLAVE_CFG_MASTER_PREFERRED:
+	case MASTER_SLAVE_CFG_MASTER_FORCE:
+		ctl = LRECR_MASTER;
+		break;
+	case MASTER_SLAVE_CFG_SLAVE_PREFERRED:
+	case MASTER_SLAVE_CFG_SLAVE_FORCE:
+		break;
+	case MASTER_SLAVE_CFG_UNKNOWN:
+	case MASTER_SLAVE_CFG_UNSUPPORTED:
+		return 0;
+	default:
+		phydev_warn(phydev, "Unsupported Master/Slave mode\n");
+		return -EOPNOTSUPP;
+	}
+
+	return phy_modify_changed(phydev, MII_BCM54XX_LRECR, LRECR_MASTER, ctl);
+}
+EXPORT_SYMBOL_GPL(bcm_setup_master_slave);
+
+int bcm_config_aneg(struct phy_device *phydev, bool changed)
+{
+	int err;
+
+	if (genphy_config_eee_advert(phydev))
+		changed = true;
+
+	err = bcm_setup_master_slave(phydev);
+	if (err < 0)
+		return err;
+	else if (err)
+		changed = true;
+
+	if (phydev->autoneg != AUTONEG_ENABLE)
+		return bcm_setup_forced(phydev);
+
+	err = bcm_config_advert(phydev);
+	if (err < 0) /* error */
+		return err;
+	else if (err)
+		changed = true;
+
+	return genphy_check_and_restart_aneg(phydev, changed);
+}
+EXPORT_SYMBOL_GPL(bcm_config_aneg);
+
+/**
+ * bcm_config_advert - sanitize and advertise auto-negotiation parameters
+ * @phydev: target phy_device struct
+ *
+ * Description: Writes MII_BCM54XX_LREANAA with the appropriate values,
+ *   after sanitizing the values to make sure we only advertise
+ *   what is supported.  Returns < 0 on error, 0 if the PHY's advertisement
+ *   hasn't changed, and > 0 if it has changed.
+ */
+int bcm_config_advert(struct phy_device *phydev)
+{
+	int err;
+	u32 adv;
+
+	/* Only allow advertising what this PHY supports */
+	linkmode_and(phydev->advertising, phydev->advertising,
+		     phydev->supported);
+
+	adv = bcm_linkmode_adv_to_mii_adv_t(phydev->advertising);
+
+	/* Setup BroadR-Reach mode advertisement */
+	err = phy_modify_changed(phydev, MII_BCM54XX_LREANAA,
+				 LRE_ADVERTISE_ALL | LREANAA_PAUSE |
+				 LREANAA_PAUSE_ASYM, adv);
+
+	if (err < 0)
+		return err;
+
+	return err > 0 ? 1 : 0;
+}
+EXPORT_SYMBOL_GPL(bcm_config_advert);
+
 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 b52189e45a84..0f6d06c0b7af 100644
--- a/drivers/net/phy/bcm-phy-lib.h
+++ b/drivers/net/phy/bcm-phy-lib.h
@@ -121,4 +121,8 @@ irqreturn_t bcm_phy_wol_isr(int irq, void *dev_id);
 int bcm_phy_led_brightness_set(struct phy_device *phydev,
 			       u8 index, enum led_brightness value);
 
+int bcm_setup_master_slave(struct phy_device *phydev);
+int bcm_config_aneg(struct phy_device *phydev, bool changed);
+int bcm_config_advert(struct phy_device *phydev);
+
 #endif /* _LINUX_BCM_PHY_LIB_H */
diff --git a/drivers/net/phy/broadcom.c b/drivers/net/phy/broadcom.c
index 370e4ed45098..5bb24c1a4428 100644
--- a/drivers/net/phy/broadcom.c
+++ b/drivers/net/phy/broadcom.c
@@ -553,18 +553,46 @@ static int bcm54810_write_mmd(struct phy_device *phydev, int devnum, u16 regnum,
 	return -EOPNOTSUPP;
 }
 
-static int bcm54811_config_init(struct phy_device *phydev)
+static int bcm5481x_get_brrmode(struct phy_device *phydev, u8 *data)
 {
-	int err, reg;
+	int reg;
 
-	/* Disable BroadR-Reach function. */
 	reg = bcm_phy_read_exp(phydev, BCM54810_EXP_BROADREACH_LRE_MISC_CTL);
-	reg &= ~BCM54810_EXP_BROADREACH_LRE_MISC_CTL_EN;
-	err = bcm_phy_write_exp(phydev, BCM54810_EXP_BROADREACH_LRE_MISC_CTL,
-				reg);
-	if (err < 0)
+
+	*data = (reg & BCM54810_EXP_BROADREACH_LRE_MISC_CTL_EN) ?
+				ETHTOOL_PHY_BRR_MODE_ON : ETHTOOL_PHY_BRR_MODE_OFF;
+
+	return 0;
+}
+
+static int bcm5481x_set_brrmode(struct phy_device *phydev, u8 on)
+{
+	int reg;
+	int err;
+
+	reg = bcm_phy_read_exp(phydev, BCM54810_EXP_BROADREACH_LRE_MISC_CTL);
+
+	if (on)
+		reg |= BCM54810_EXP_BROADREACH_LRE_MISC_CTL_EN;
+	else
+		reg &= ~BCM54810_EXP_BROADREACH_LRE_MISC_CTL_EN;
+
+	err = bcm_phy_write_exp(phydev, BCM54810_EXP_BROADREACH_LRE_MISC_CTL, reg);
+	if (err)
 		return err;
 
+	/* Ensure LRE or IEEE register set is accessed according to the brr on/off,
+	 *  thus set the override
+	 */
+	return bcm_phy_write_exp(phydev, BCM54811_EXP_BROADREACH_LRE_OVERLAY_CTL,
+		BCM54811_EXP_BROADREACH_LRE_OVERLAY_CTL_EN |
+		on ? 0 : BCM54811_EXP_BROADREACH_LRE_OVERLAY_CTL_OVERRIDE_VAL);
+}
+
+static int bcm54811_config_init(struct phy_device *phydev)
+{
+	int err, reg;
+
 	err = bcm54xx_config_init(phydev);
 
 	/* Enable CLK125 MUX on LED4 if ref clock is enabled. */
@@ -576,18 +604,16 @@ static int bcm54811_config_init(struct phy_device *phydev)
 			return err;
 	}
 
-	return err;
+	/* Configure BroadR-Reach function. */
+	return  bcm5481x_set_brrmode(phydev, ETHTOOL_PHY_BRR_MODE_OFF);
 }
 
-static int bcm5481_config_aneg(struct phy_device *phydev)
+static int bcm5481x_config_delay_swap(struct phy_device *phydev)
 {
 	struct device_node *np = phydev->mdio.dev.of_node;
 	int ret;
 
-	/* Aneg firstly. */
-	ret = genphy_config_aneg(phydev);
-
-	/* Then we can set up the delay. */
+	/* Set up the delay. */
 	bcm54xx_config_clock_delay(phydev);
 
 	if (of_property_read_bool(np, "enet-phy-lane-swap")) {
@@ -601,6 +627,56 @@ static int bcm5481_config_aneg(struct phy_device *phydev)
 	return ret;
 }
 
+static int bcm5481_config_aneg(struct phy_device *phydev)
+{
+	int ret;
+	u8 brr_mode;
+
+	/* Aneg firstly. */
+	ret = bcm5481x_get_brrmode(phydev, &brr_mode);
+	if (ret)
+		return ret;
+
+	if (brr_mode == ETHTOOL_PHY_BRR_MODE_ON)
+		ret = bcm_config_aneg(phydev, false);
+	else
+		ret = genphy_config_aneg(phydev);
+
+	if (ret)
+		return ret;
+
+	/* Then we can set up the delay and swap. */
+	return bcm5481x_config_delay_swap(phydev);
+}
+
+static int bcm54811_config_aneg(struct phy_device *phydev)
+{
+	int ret;
+	u8 brr_mode;
+
+	/* Aneg firstly. */
+	ret = bcm5481x_get_brrmode(phydev, &brr_mode);
+	if (ret)
+		return ret;
+
+	if (brr_mode == ETHTOOL_PHY_BRR_MODE_ON) {
+		/* BCM54811 is only capable of autonegotiation in IEEE mode */
+		if (phydev->autoneg)
+			return -EOPNOTSUPP;
+
+		ret = bcm_config_aneg(phydev, false);
+
+	} else {
+		ret = genphy_config_aneg(phydev);
+	}
+
+	if (ret)
+		return ret;
+
+	/* Then we can set up the delay and swap. */
+	return bcm5481x_config_delay_swap(phydev);
+}
+
 struct bcm54616s_phy_priv {
 	bool mode_1000bx_en;
 };
@@ -1062,6 +1138,234 @@ static void bcm54xx_link_change_notify(struct phy_device *phydev)
 	bcm_phy_write_exp(phydev, MII_BCM54XX_EXP_EXP08, ret);
 }
 
+static int bcm54811_read_abilities(struct phy_device *phydev)
+{
+	int val, err;
+	int i;
+	static const int modes_array[] = {ETHTOOL_LINK_MODE_100baseT1_Full_BIT,
+					  ETHTOOL_LINK_MODE_1BR10_BIT,
+					  ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
+					  ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
+					  ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
+					  ETHTOOL_LINK_MODE_100baseT_Full_BIT,
+					  ETHTOOL_LINK_MODE_100baseT_Half_BIT,
+					  ETHTOOL_LINK_MODE_10baseT_Full_BIT,
+					  ETHTOOL_LINK_MODE_10baseT_Half_BIT};
+
+	u8 brr_mode;
+
+	for (i = 0; i < ARRAY_SIZE(modes_array); i++)
+		linkmode_clear_bit(modes_array[i], phydev->supported);
+
+	err = bcm5481x_get_brrmode(phydev, &brr_mode);
+
+	if (err)
+		return err;
+
+	if (brr_mode == ETHTOOL_PHY_BRR_MODE_ON) {
+		linkmode_set_bit_array(phy_basic_ports_array,
+				       ARRAY_SIZE(phy_basic_ports_array),
+				       phydev->supported);
+
+		val = phy_read(phydev, MII_BCM54XX_LRESR);
+		if (val < 0)
+			return val;
+
+		linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
+				 phydev->supported, 1);
+		linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT1_Full_BIT,
+				 phydev->supported,
+				 val & LRESR_100_1PAIR);
+		linkmode_mod_bit(ETHTOOL_LINK_MODE_1BR10_BIT,
+				 phydev->supported,
+				 val & LRESR_10_1PAIR);
+	} else {
+		return genphy_read_abilities(phydev);
+	}
+
+	return err;
+}
+
+static int bcm5481x_get_tunable(struct phy_device *phydev,
+				struct ethtool_tunable *tuna, void *data)
+{
+	switch (tuna->id) {
+	case ETHTOOL_PHY_BRR_MODE:
+		return bcm5481x_get_brrmode(phydev, data);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int bcm5481x_set_tunable(struct phy_device *phydev,
+				struct ethtool_tunable *tuna, const void *data)
+{
+	int res;
+
+	switch (tuna->id) {
+	case ETHTOOL_PHY_BRR_MODE:
+		res =  bcm5481x_set_brrmode(phydev, *(const u8 *)data);
+		if (res >= 0)
+			res = bcm54811_read_abilities(phydev);
+		break;
+	default:
+		res = -EOPNOTSUPP;
+	}
+
+	return res;
+}
+
+static int bcm_read_master_slave(struct phy_device *phydev)
+{
+	int cfg, state;
+	int val;
+
+	/* In BroadR-Reach mode we are always capable of master-slave
+	 *  and there is no preferred master or slave configuration
+	 */
+	phydev->master_slave_get = MASTER_SLAVE_CFG_UNKNOWN;
+	phydev->master_slave_state = MASTER_SLAVE_STATE_UNKNOWN;
+
+	val = phy_read(phydev, MII_BCM54XX_LRECR);
+	if (val < 0)
+		return val;
+
+	if ((val & LRECR_LDSEN) == 0) {
+		if (val & LRECR_MASTER)
+			cfg = MASTER_SLAVE_CFG_MASTER_FORCE;
+		else
+			cfg = MASTER_SLAVE_CFG_SLAVE_FORCE;
+	}
+
+	val = phy_read(phydev, MII_BCM54XX_LRELDSE);
+	if (val < 0)
+		return val;
+
+	if (val & LDSE_MASTER)
+		state = MASTER_SLAVE_STATE_MASTER;
+	else
+		state = MASTER_SLAVE_STATE_SLAVE;
+
+	phydev->master_slave_get = cfg;
+	phydev->master_slave_state = state;
+
+	return 0;
+}
+
+/* Read LDS Link Partner Ability in BroadR-Reach mode */
+static int bcm_read_lpa(struct phy_device *phydev)
+{
+	int i, lrelpa;
+
+	if (phydev->autoneg != AUTONEG_ENABLE) {
+		if (!phydev->autoneg_complete) {
+			/* aneg not yet done, reset all relevant bits */
+			static int br_bits[] = { ETHTOOL_LINK_MODE_Autoneg_BIT,
+						 ETHTOOL_LINK_MODE_Pause_BIT,
+						 ETHTOOL_LINK_MODE_Asym_Pause_BIT,
+						 ETHTOOL_LINK_MODE_1BR10_BIT,
+						 ETHTOOL_LINK_MODE_100baseT1_Full_BIT };
+			for (i = 0; i < ARRAY_SIZE(br_bits); i++)
+				linkmode_clear_bit(br_bits[i], phydev->lp_advertising);
+
+			return 0;
+		}
+
+		/* Long-Distance-Signalling Link Partner Ability */
+		lrelpa = phy_read(phydev, MII_BCM54XX_LRELPA);
+		if (lrelpa < 0)
+			return lrelpa;
+
+		linkmode_mod_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
+				 phydev->lp_advertising, lrelpa & LRELPA_PAUSE_ASYM);
+		linkmode_mod_bit(ETHTOOL_LINK_MODE_Pause_BIT,
+				 phydev->lp_advertising, lrelpa & LRELPA_PAUSE);
+		linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT1_Full_BIT,
+				 phydev->lp_advertising, lrelpa & LRELPA_100_1PAIR);
+		linkmode_mod_bit(ETHTOOL_LINK_MODE_1BR10_BIT,
+				 phydev->lp_advertising, lrelpa & LRELPA_10_1PAIR);
+	} else {
+		linkmode_zero(phydev->lp_advertising);
+	}
+
+	return 0;
+}
+
+static int bcm_read_status_fixed(struct phy_device *phydev)
+{
+	int lrecr = phy_read(phydev, MII_BCM54XX_LRECR);
+
+	if (lrecr < 0)
+		return lrecr;
+
+	phydev->duplex = DUPLEX_FULL;
+
+	if (lrecr & LRECR_SPEED100)
+		phydev->speed = SPEED_100;
+	else
+		phydev->speed = SPEED_10;
+
+	return 0;
+}
+
+static int bcm54811_read_status(struct phy_device *phydev)
+{
+	int err;
+	u8 brr_mode;
+
+	err = bcm5481x_get_brrmode(phydev, &brr_mode);
+
+	if (err)
+		return err;
+
+	if (brr_mode == ETHTOOL_PHY_BRR_MODE_ON) {
+		/* Get the status in BroadRReach mode just like genphy_read_status
+		 *   does in normal mode
+		 */
+
+		int err, old_link = phydev->link;
+
+		/* Update the link, but return if there was an error
+		 *  genphy_update_link() functions equally on IEEE and LRE
+		 *  register set
+		 */
+
+		err = genphy_update_link(phydev);
+		if (err)
+			return err;
+
+		/* why bother the PHY if nothing can have changed */
+		if (phydev->autoneg == AUTONEG_ENABLE && old_link && phydev->link)
+			return 0;
+
+		phydev->speed = SPEED_UNKNOWN;
+		phydev->duplex = DUPLEX_UNKNOWN;
+		phydev->pause = 0;
+		phydev->asym_pause = 0;
+
+		err = bcm_read_master_slave(phydev);
+		if (err < 0)
+			return err;
+
+		/* Read LDS Link Partner Ability */
+		err = bcm_read_lpa(phydev);
+		if (err < 0)
+			return err;
+
+		if (phydev->autoneg == AUTONEG_ENABLE && phydev->autoneg_complete) {
+			phy_resolve_aneg_linkmode(phydev);
+		} else if (phydev->autoneg == AUTONEG_DISABLE) {
+			err = bcm_read_status_fixed(phydev);
+			if (err < 0)
+				return err;
+		}
+	} else {
+		err = genphy_read_status(phydev);
+	}
+
+	return err;
+}
+
 static struct phy_driver broadcom_drivers[] = {
 {
 	.phy_id		= PHY_ID_BCM5411,
@@ -1212,9 +1516,13 @@ static struct phy_driver broadcom_drivers[] = {
 	.get_stats	= bcm54xx_get_stats,
 	.probe		= bcm54xx_phy_probe,
 	.config_init    = bcm54811_config_init,
-	.config_aneg    = bcm5481_config_aneg,
+	.config_aneg    = bcm54811_config_aneg,
 	.config_intr    = bcm_phy_config_intr,
 	.handle_interrupt = bcm_phy_handle_interrupt,
+	.read_status	= bcm54811_read_status,
+	.get_tunable	= bcm5481x_get_tunable,
+	.set_tunable	= bcm5481x_set_tunable,
+	.get_features	= bcm54811_read_abilities,
 	.suspend	= bcm54xx_suspend,
 	.resume		= bcm54xx_resume,
 	.link_change_notify	= bcm54xx_link_change_notify,
-- 
2.39.2

Re: [PATCH v2 3/3] net: phy: bcm-phy-lib: Implement BroadR-Reach link modes

[kernel test robot]

Hi Kamil,

kernel test robot noticed the following build warnings:

[auto build test WARNING on net/main]
[also build test WARNING on net-next/main linus/master v6.9-rc6 next-20240503]
[cannot apply to horms-ipvs/master]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Kamil-Hor-k-2N/net-phy-bcm54811-New-link-mode-for-BroadR-Reach/20240503-164308
base:   net/main
patch link:    https://lore.kernel.org/r/20240503083719.899312-4-kamilh%40axis.com
patch subject: [PATCH v2 3/3] net: phy: bcm-phy-lib: Implement BroadR-Reach link modes
config: powerpc-randconfig-r081-20240504 (https://download.01.org/0day-ci/archive/20240504/202405040748.9mCHwtzA-lkp@intel.com/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project 37ae4ad0eef338776c7e2cffb3896153d43dcd90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240504/202405040748.9mCHwtzA-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405040748.9mCHwtzA-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/net/phy/broadcom.c:13:
   In file included from drivers/net/phy/bcm-phy-lib.h:9:
   In file included from include/linux/brcmphy.h:5:
   In file included from include/linux/phy.h:16:
   In file included from include/linux/ethtool.h:18:
   In file included from include/linux/if_ether.h:19:
   In file included from include/linux/skbuff.h:17:
   In file included from include/linux/bvec.h:10:
   In file included from include/linux/highmem.h:8:
   In file included from include/linux/cacheflush.h:5:
   In file included from arch/powerpc/include/asm/cacheflush.h:7:
   In file included from include/linux/mm.h:2210:
   include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     522 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
>> drivers/net/phy/broadcom.c:619:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
     619 |         if (of_property_read_bool(np, "enet-phy-lane-swap")) {
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/net/phy/broadcom.c:627:9: note: uninitialized use occurs here
     627 |         return ret;
         |                ^~~
   drivers/net/phy/broadcom.c:619:2: note: remove the 'if' if its condition is always true
     619 |         if (of_property_read_bool(np, "enet-phy-lane-swap")) {
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/net/phy/broadcom.c:614:9: note: initialize the variable 'ret' to silence this warning
     614 |         int ret;
         |                ^
         |                 = 0
   2 warnings generated.


vim +619 drivers/net/phy/broadcom.c

b0ed0bbfb3046e Kevin Lo         2020-05-16  610  
f1e9c8e593d6ea Kamil Horák - 2N 2024-05-03  611  static int bcm5481x_config_delay_swap(struct phy_device *phydev)
57bb7e222804c6 Anton Vorontsov  2008-03-04  612  {
b14995ac2527b4 Jon Mason        2016-11-04  613  	struct device_node *np = phydev->mdio.dev.of_node;
57bb7e222804c6 Anton Vorontsov  2008-03-04  614  	int ret;
57bb7e222804c6 Anton Vorontsov  2008-03-04  615  
f1e9c8e593d6ea Kamil Horák - 2N 2024-05-03  616  	/* Set up the delay. */
042cb56478152b Tao Ren          2018-11-05  617  	bcm54xx_config_clock_delay(phydev);
57bb7e222804c6 Anton Vorontsov  2008-03-04  618  
b14995ac2527b4 Jon Mason        2016-11-04 @619  	if (of_property_read_bool(np, "enet-phy-lane-swap")) {
b14995ac2527b4 Jon Mason        2016-11-04  620  		/* Lane Swap - Undocumented register...magic! */
b14995ac2527b4 Jon Mason        2016-11-04  621  		ret = bcm_phy_write_exp(phydev, MII_BCM54XX_EXP_SEL_ER + 0x9,
b14995ac2527b4 Jon Mason        2016-11-04  622  					0x11B);
b14995ac2527b4 Jon Mason        2016-11-04  623  		if (ret < 0)
b14995ac2527b4 Jon Mason        2016-11-04  624  			return ret;
b14995ac2527b4 Jon Mason        2016-11-04  625  	}
b14995ac2527b4 Jon Mason        2016-11-04  626  
57bb7e222804c6 Anton Vorontsov  2008-03-04  627  	return ret;
57bb7e222804c6 Anton Vorontsov  2008-03-04  628  }
57bb7e222804c6 Anton Vorontsov  2008-03-04  629  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Re: [PATCH v2 3/3] net: phy: bcm-phy-lib: Implement BroadR-Reach link modes

[Dan Carpenter]

Hi Kamil,

kernel test robot noticed the following build warnings:

https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Kamil-Hor-k-2N/net-phy-bcm54811-New-link-mode-for-BroadR-Reach/20240503-164308
base:   net/main
patch link:    https://lore.kernel.org/r/20240503083719.899312-4-kamilh%40axis.com
patch subject: [PATCH v2 3/3] net: phy: bcm-phy-lib: Implement BroadR-Reach link modes
config: i386-randconfig-141-20240504 (https://download.01.org/0day-ci/archive/20240504/202405041037.sjZak003-lkp@intel.com/config)
compiler: clang version 18.1.4 (https://github.com/llvm/llvm-project e6c3289804a67ea0bb6a86fadbe454dd93b8d855)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
| Closes: https://lore.kernel.org/r/202405041037.sjZak003-lkp@intel.com/

smatch warnings:
drivers/net/phy/broadcom.c:627 bcm5481x_config_delay_swap() error: uninitialized symbol 'ret'.
drivers/net/phy/broadcom.c:1249 bcm_read_master_slave() error: uninitialized symbol 'cfg'.

vim +/ret +627 drivers/net/phy/broadcom.c

f1e9c8e593d6ea Kamil Horák - 2N 2024-05-03  611  static int bcm5481x_config_delay_swap(struct phy_device *phydev)
57bb7e222804c6 Anton Vorontsov  2008-03-04  612  {
b14995ac2527b4 Jon Mason        2016-11-04  613  	struct device_node *np = phydev->mdio.dev.of_node;
57bb7e222804c6 Anton Vorontsov  2008-03-04  614  	int ret;
57bb7e222804c6 Anton Vorontsov  2008-03-04  615  
f1e9c8e593d6ea Kamil Horák - 2N 2024-05-03  616  	/* Set up the delay. */
042cb56478152b Tao Ren          2018-11-05  617  	bcm54xx_config_clock_delay(phydev);
57bb7e222804c6 Anton Vorontsov  2008-03-04  618  
b14995ac2527b4 Jon Mason        2016-11-04  619  	if (of_property_read_bool(np, "enet-phy-lane-swap")) {
b14995ac2527b4 Jon Mason        2016-11-04  620  		/* Lane Swap - Undocumented register...magic! */
b14995ac2527b4 Jon Mason        2016-11-04  621  		ret = bcm_phy_write_exp(phydev, MII_BCM54XX_EXP_SEL_ER + 0x9,
b14995ac2527b4 Jon Mason        2016-11-04  622  					0x11B);
b14995ac2527b4 Jon Mason        2016-11-04  623  		if (ret < 0)
b14995ac2527b4 Jon Mason        2016-11-04  624  			return ret;
b14995ac2527b4 Jon Mason        2016-11-04  625  	}

"ret" not initialized on else path.

b14995ac2527b4 Jon Mason        2016-11-04  626  
57bb7e222804c6 Anton Vorontsov  2008-03-04 @627  	return ret;

Also "return 0;" is always better.

57bb7e222804c6 Anton Vorontsov  2008-03-04  628  }

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki