[PATCH net-next v3 0/6] net: dsa: mv88e6xxx: Peridot/Topaz SERDES changes

[PATCH net-next v3 0/6] net: dsa: mv88e6xxx: Peridot/Topaz SERDES changes

[Marek Behún]

Hello,

this is the third version of changes for the Topaz/Peridot family of
switches. The patches apply on net-next.
Changes since v2:
 - per Vivien's request I merged the three different patches operating
   on code for hidden registers into one patch (second in this series)
 - also per Vivien's request I changed the serdes_get_lane method: its
   return value is now used only if error's occur, as the rest of this
   drivers functions do. Lane number is put into a place pointed to
   by the s8 *lane argument. The error semantics also changed: if there
   is no lane on a port, the function should still return 0 and should
   put -1 into *lane. Negative error value should be returned only if
   a real error occurs, for example when a MDIO read operation failed.
 - also per Vivien's request the mv88e6xxx_serdes_get_lane function was
   put into serdes.h as static inline, since it is just a wrapper
 - the patch that simplified SERDES code for Topaz and Peridot families
   was merged into one patch

Marek

Marek Behún (6):
  net: dsa: mv88e6xxx: support 2500base-x in SGMII IRQ handler
  net: dsa: mv88e6xxx: update code operating on hidden registers
  net: dsa: mv88e6xxx: create serdes_get_lane chip operation
  net: dsa: mv88e6xxx: simplify SERDES code for Topaz and Peridot
  net: dsa: mv88e6xxx: rename port cmode macro
  net: dsa: mv88e6xxx: fully support SERDES on Topaz family

 drivers/net/dsa/mv88e6xxx/Makefile      |   1 +
 drivers/net/dsa/mv88e6xxx/chip.c        |  88 +++-----
 drivers/net/dsa/mv88e6xxx/chip.h        |   3 +
 drivers/net/dsa/mv88e6xxx/port.c        |  98 ++++++---
 drivers/net/dsa/mv88e6xxx/port.h        |  30 ++-
 drivers/net/dsa/mv88e6xxx/port_hidden.c |  70 ++++++
 drivers/net/dsa/mv88e6xxx/serdes.c      | 275 +++++++++++-------------
 drivers/net/dsa/mv88e6xxx/serdes.h      |  27 ++-
 8 files changed, 333 insertions(+), 259 deletions(-)
 create mode 100644 drivers/net/dsa/mv88e6xxx/port_hidden.c

-- 
2.21.0

[PATCH net-next v3 1/6] net: dsa: mv88e6xxx: support 2500base-x in SGMII IRQ handler

[Marek Behún]

The mv88e6390_serdes_irq_link_sgmii IRQ handler reads the SERDES PHY
status register to determine speed, among other things. If cmode of the
port is set to 2500base-x, though, the PHY still reports 1000 Mbps (the
PHY register itself does not differentiate between 1000 Mbps and 2500
Mbps - it thinks it is running at 1000 Mbps, although clock is 2.5x
faster).
Look at the cmode and set SPEED_2500 if cmode is set to 2500base-x.
Also tell mv88e6xxx_port_setup_mac the PHY interface mode corresponding
to current cmode in terms of phy_interface_t.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Vladimir Oltean <olteanv@gmail.com>
Cc: Vivien Didelot <vivien.didelot@gmail.com>
---
 drivers/net/dsa/mv88e6xxx/serdes.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/mv88e6xxx/serdes.c b/drivers/net/dsa/mv88e6xxx/serdes.c
index 20c526c2a9ee..678aaba3d019 100644
--- a/drivers/net/dsa/mv88e6xxx/serdes.c
+++ b/drivers/net/dsa/mv88e6xxx/serdes.c
@@ -505,9 +505,11 @@ int mv88e6390x_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on)
 static void mv88e6390_serdes_irq_link_sgmii(struct mv88e6xxx_chip *chip,
 					    int port, int lane)
 {
+	u8 cmode = chip->ports[port].cmode;
 	struct dsa_switch *ds = chip->ds;
 	int duplex = DUPLEX_UNKNOWN;
 	int speed = SPEED_UNKNOWN;
+	phy_interface_t mode;
 	int link, err;
 	u16 status;
 
@@ -527,7 +529,10 @@ static void mv88e6390_serdes_irq_link_sgmii(struct mv88e6xxx_chip *chip,
 
 		switch (status & MV88E6390_SGMII_PHY_STATUS_SPEED_MASK) {
 		case MV88E6390_SGMII_PHY_STATUS_SPEED_1000:
-			speed = SPEED_1000;
+			if (cmode == MV88E6XXX_PORT_STS_CMODE_2500BASEX)
+				speed = SPEED_2500;
+			else
+				speed = SPEED_1000;
 			break;
 		case MV88E6390_SGMII_PHY_STATUS_SPEED_100:
 			speed = SPEED_100;
@@ -541,8 +546,22 @@ static void mv88e6390_serdes_irq_link_sgmii(struct mv88e6xxx_chip *chip,
 		}
 	}
 
+	switch (cmode) {
+	case MV88E6XXX_PORT_STS_CMODE_SGMII:
+		mode = PHY_INTERFACE_MODE_SGMII;
+		break;
+	case MV88E6XXX_PORT_STS_CMODE_1000BASE_X:
+		mode = PHY_INTERFACE_MODE_1000BASEX;
+		break;
+	case MV88E6XXX_PORT_STS_CMODE_2500BASEX:
+		mode = PHY_INTERFACE_MODE_2500BASEX;
+		break;
+	default:
+		mode = PHY_INTERFACE_MODE_NA;
+	}
+
 	err = mv88e6xxx_port_setup_mac(chip, port, link, speed, duplex,
-				       PAUSE_OFF, PHY_INTERFACE_MODE_NA);
+				       PAUSE_OFF, mode);
 	if (err)
 		dev_err(chip->dev, "can't propagate PHY settings to MAC: %d\n",
 			err);
-- 
2.21.0

[PATCH net-next v3 2/6] net: dsa: mv88e6xxx: update code operating on hidden registers

[Marek Behún]

This patch moves the functions operating on the hidden debug registers
into it's own file, port_hidden.c. The functions prefix is renamed from
mv88e6390_hidden_ to mv88e6xxx_port_hidden_, to be consistent with the
rest of this driver. The macros are prefixed with MV88E6XXX_ prefix, and
are changed not to use the BIT() macro nor bit shifts, since the rest of
the port.h file does not use it.

We also add the support for setting the Block Address field when
operating hidden registers. Marvell's mdio examples for SERDES settings
on Topaz use Block Address 0x7 when reading/writing hidden registers,
and although the specification says that block must be set to 0xf, those
settings are reachable only with Block Address 0x7.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
---
 drivers/net/dsa/mv88e6xxx/Makefile      |  1 +
 drivers/net/dsa/mv88e6xxx/chip.c        | 58 +-------------------
 drivers/net/dsa/mv88e6xxx/port.h        | 22 +++++---
 drivers/net/dsa/mv88e6xxx/port_hidden.c | 70 +++++++++++++++++++++++++
 4 files changed, 87 insertions(+), 64 deletions(-)
 create mode 100644 drivers/net/dsa/mv88e6xxx/port_hidden.c

diff --git a/drivers/net/dsa/mv88e6xxx/Makefile b/drivers/net/dsa/mv88e6xxx/Makefile
index e85755dde90b..aa645ff86f64 100644
--- a/drivers/net/dsa/mv88e6xxx/Makefile
+++ b/drivers/net/dsa/mv88e6xxx/Makefile
@@ -10,6 +10,7 @@ mv88e6xxx-$(CONFIG_NET_DSA_MV88E6XXX_GLOBAL2) += global2_scratch.o
 mv88e6xxx-$(CONFIG_NET_DSA_MV88E6XXX_PTP) += hwtstamp.o
 mv88e6xxx-objs += phy.o
 mv88e6xxx-objs += port.o
+mv88e6xxx-objs += port_hidden.o
 mv88e6xxx-$(CONFIG_NET_DSA_MV88E6XXX_PTP) += ptp.o
 mv88e6xxx-objs += serdes.o
 mv88e6xxx-objs += smi.o
diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index d0bf98c10b2b..ec4274d71145 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -2317,60 +2317,6 @@ static int mv88e6xxx_stats_setup(struct mv88e6xxx_chip *chip)
 	return mv88e6xxx_g1_stats_clear(chip);
 }
 
-/* The mv88e6390 has some hidden registers used for debug and
- * development. The errata also makes use of them.
- */
-static int mv88e6390_hidden_write(struct mv88e6xxx_chip *chip, int port,
-				  int reg, u16 val)
-{
-	u16 ctrl;
-	int err;
-
-	err = mv88e6xxx_port_write(chip, PORT_RESERVED_1A_DATA_PORT,
-				   PORT_RESERVED_1A, val);
-	if (err)
-		return err;
-
-	ctrl = PORT_RESERVED_1A_BUSY | PORT_RESERVED_1A_WRITE |
-	       PORT_RESERVED_1A_BLOCK | port << PORT_RESERVED_1A_PORT_SHIFT |
-	       reg;
-
-	return mv88e6xxx_port_write(chip, PORT_RESERVED_1A_CTRL_PORT,
-				    PORT_RESERVED_1A, ctrl);
-}
-
-static int mv88e6390_hidden_wait(struct mv88e6xxx_chip *chip)
-{
-	int bit = __bf_shf(PORT_RESERVED_1A_BUSY);
-
-	return mv88e6xxx_wait_bit(chip, PORT_RESERVED_1A_CTRL_PORT,
-				  PORT_RESERVED_1A, bit, 0);
-}
-
-
-static int mv88e6390_hidden_read(struct mv88e6xxx_chip *chip, int port,
-				  int reg, u16 *val)
-{
-	u16 ctrl;
-	int err;
-
-	ctrl = PORT_RESERVED_1A_BUSY | PORT_RESERVED_1A_READ |
-	       PORT_RESERVED_1A_BLOCK | port << PORT_RESERVED_1A_PORT_SHIFT |
-	       reg;
-
-	err = mv88e6xxx_port_write(chip, PORT_RESERVED_1A_CTRL_PORT,
-				   PORT_RESERVED_1A, ctrl);
-	if (err)
-		return err;
-
-	err = mv88e6390_hidden_wait(chip);
-	if (err)
-		return err;
-
-	return 	mv88e6xxx_port_read(chip, PORT_RESERVED_1A_DATA_PORT,
-				    PORT_RESERVED_1A, val);
-}
-
 /* Check if the errata has already been applied. */
 static bool mv88e6390_setup_errata_applied(struct mv88e6xxx_chip *chip)
 {
@@ -2379,7 +2325,7 @@ static bool mv88e6390_setup_errata_applied(struct mv88e6xxx_chip *chip)
 	u16 val;
 
 	for (port = 0; port < mv88e6xxx_num_ports(chip); port++) {
-		err = mv88e6390_hidden_read(chip, port, 0, &val);
+		err = mv88e6xxx_port_hidden_read(chip, 0xf, port, 0, &val);
 		if (err) {
 			dev_err(chip->dev,
 				"Error reading hidden register: %d\n", err);
@@ -2412,7 +2358,7 @@ static int mv88e6390_setup_errata(struct mv88e6xxx_chip *chip)
 	}
 
 	for (port = 0; port < mv88e6xxx_num_ports(chip); port++) {
-		err = mv88e6390_hidden_write(chip, port, 0, 0x01c0);
+		err = mv88e6xxx_port_hidden_write(chip, 0xf, port, 0, 0x01c0);
 		if (err)
 			return err;
 	}
diff --git a/drivers/net/dsa/mv88e6xxx/port.h b/drivers/net/dsa/mv88e6xxx/port.h
index 1abf5ea033e2..64c73fd171ee 100644
--- a/drivers/net/dsa/mv88e6xxx/port.h
+++ b/drivers/net/dsa/mv88e6xxx/port.h
@@ -261,14 +261,14 @@
 #define MV88E6095_PORT_IEEE_PRIO_REMAP_4567	0x19
 
 /* Offset 0x1a: Magic undocumented errata register */
-#define PORT_RESERVED_1A			0x1a
-#define PORT_RESERVED_1A_BUSY			BIT(15)
-#define PORT_RESERVED_1A_WRITE			BIT(14)
-#define PORT_RESERVED_1A_READ			0
-#define PORT_RESERVED_1A_PORT_SHIFT		5
-#define PORT_RESERVED_1A_BLOCK			(0xf << 10)
-#define PORT_RESERVED_1A_CTRL_PORT		4
-#define PORT_RESERVED_1A_DATA_PORT		5
+#define MV88E6XXX_PORT_RESERVED_1A		0x1a
+#define MV88E6XXX_PORT_RESERVED_1A_BUSY		0x8000
+#define MV88E6XXX_PORT_RESERVED_1A_WRITE	0x4000
+#define MV88E6XXX_PORT_RESERVED_1A_READ		0x0000
+#define MV88E6XXX_PORT_RESERVED_1A_PORT_SHIFT	5
+#define MV88E6XXX_PORT_RESERVED_1A_BLOCK_SHIFT	10
+#define MV88E6XXX_PORT_RESERVED_1A_CTRL_PORT	0x04
+#define MV88E6XXX_PORT_RESERVED_1A_DATA_PORT	0x05
 
 int mv88e6xxx_port_read(struct mv88e6xxx_chip *chip, int port, int reg,
 			u16 *val);
@@ -353,4 +353,10 @@ int mv88e6095_port_set_upstream_port(struct mv88e6xxx_chip *chip, int port,
 int mv88e6xxx_port_disable_learn_limit(struct mv88e6xxx_chip *chip, int port);
 int mv88e6xxx_port_disable_pri_override(struct mv88e6xxx_chip *chip, int port);
 
+int mv88e6xxx_port_hidden_write(struct mv88e6xxx_chip *chip, int block,
+				int port, int reg, u16 val);
+int mv88e6xxx_port_hidden_wait(struct mv88e6xxx_chip *chip);
+int mv88e6xxx_port_hidden_read(struct mv88e6xxx_chip *chip, int block, int port,
+			       int reg, u16 *val);
+
 #endif /* _MV88E6XXX_PORT_H */
diff --git a/drivers/net/dsa/mv88e6xxx/port_hidden.c b/drivers/net/dsa/mv88e6xxx/port_hidden.c
new file mode 100644
index 000000000000..fc0a45cb4f68
--- /dev/null
+++ b/drivers/net/dsa/mv88e6xxx/port_hidden.c
@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Marvell 88E6xxx Switch Hidden Registers support
+ *
+ * Copyright (c) 2008 Marvell Semiconductor
+ *
+ * Copyright (c) 2019 Andrew Lunn <andrew@lunn.ch>
+ */
+
+#include <linux/bitfield.h>
+
+#include "chip.h"
+#include "port.h"
+
+/* The mv88e6390 and mv88e6341 have some hidden registers used for debug and
+ * development. The errata also makes use of them.
+ */
+int mv88e6xxx_port_hidden_write(struct mv88e6xxx_chip *chip, int block,
+				int port, int reg, u16 val)
+{
+	u16 ctrl;
+	int err;
+
+	err = mv88e6xxx_port_write(chip, MV88E6XXX_PORT_RESERVED_1A_DATA_PORT,
+				   MV88E6XXX_PORT_RESERVED_1A, val);
+	if (err)
+		return err;
+
+	ctrl = MV88E6XXX_PORT_RESERVED_1A_BUSY |
+	       MV88E6XXX_PORT_RESERVED_1A_WRITE |
+	       block << MV88E6XXX_PORT_RESERVED_1A_BLOCK_SHIFT |
+	       port << MV88E6XXX_PORT_RESERVED_1A_PORT_SHIFT |
+	       reg;
+
+	return mv88e6xxx_port_write(chip, MV88E6XXX_PORT_RESERVED_1A_CTRL_PORT,
+				    MV88E6XXX_PORT_RESERVED_1A, ctrl);
+}
+
+int mv88e6xxx_port_hidden_wait(struct mv88e6xxx_chip *chip)
+{
+	int bit = __bf_shf(MV88E6XXX_PORT_RESERVED_1A_BUSY);
+
+	return mv88e6xxx_wait_bit(chip, MV88E6XXX_PORT_RESERVED_1A_CTRL_PORT,
+				  MV88E6XXX_PORT_RESERVED_1A, bit, 0);
+}
+
+int mv88e6xxx_port_hidden_read(struct mv88e6xxx_chip *chip, int block, int port,
+			       int reg, u16 *val)
+{
+	u16 ctrl;
+	int err;
+
+	ctrl = MV88E6XXX_PORT_RESERVED_1A_BUSY |
+	       MV88E6XXX_PORT_RESERVED_1A_READ |
+	       block << MV88E6XXX_PORT_RESERVED_1A_BLOCK_SHIFT |
+	       port << MV88E6XXX_PORT_RESERVED_1A_PORT_SHIFT |
+	       reg;
+
+	err = mv88e6xxx_port_write(chip, MV88E6XXX_PORT_RESERVED_1A_CTRL_PORT,
+				   MV88E6XXX_PORT_RESERVED_1A, ctrl);
+	if (err)
+		return err;
+
+	err = mv88e6xxx_port_hidden_wait(chip);
+	if (err)
+		return err;
+
+	return mv88e6xxx_port_read(chip, MV88E6XXX_PORT_RESERVED_1A_DATA_PORT,
+				   MV88E6XXX_PORT_RESERVED_1A, val);
+}
-- 
2.21.0

Re: [PATCH net-next v3 2/6] net: dsa: mv88e6xxx: update code operating on hidden registers

[Vivien Didelot]

Hi Marek,

On Sun, 25 Aug 2019 05:59:11 +0200, Marek Behún <marek.behun@nic.cz> wrote:
> This patch moves the functions operating on the hidden debug registers
> into it's own file, port_hidden.c. The functions prefix is renamed from
> mv88e6390_hidden_ to mv88e6xxx_port_hidden_, to be consistent with the
> rest of this driver. The macros are prefixed with MV88E6XXX_ prefix, and
> are changed not to use the BIT() macro nor bit shifts, since the rest of
> the port.h file does not use it.
> 
> We also add the support for setting the Block Address field when
> operating hidden registers. Marvell's mdio examples for SERDES settings
> on Topaz use Block Address 0x7 when reading/writing hidden registers,
> and although the specification says that block must be set to 0xf, those
> settings are reachable only with Block Address 0x7.
> 
> Signed-off-by: Marek Behún <marek.behun@nic.cz>

Even though there are several semantic changes here, bisectability is
preserved, and blaming the new functions will easily show which commit
introduced this new API and why. Much more readable and well documented:

Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com>

[PATCH net-next v3 3/6] net: dsa: mv88e6xxx: create serdes_get_lane chip operation

[Marek Behún]

Create a serdes_get_lane() method in the mv88e6xxx operations structure.
Use it instead of calling the different implementations.
Also change the methods so that their return value is used only for
error. The lane number is put into a place referred to by a pointer
given as argument. If the port does not have a lane, put -1 there.
Lanes are phy addresses, so use s8 as their type.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
---
 drivers/net/dsa/mv88e6xxx/chip.c   |   6 ++
 drivers/net/dsa/mv88e6xxx/chip.h   |   3 +
 drivers/net/dsa/mv88e6xxx/port.c   |  14 ++--
 drivers/net/dsa/mv88e6xxx/serdes.c | 130 +++++++++++++++--------------
 drivers/net/dsa/mv88e6xxx/serdes.h |  20 ++++-
 5 files changed, 99 insertions(+), 74 deletions(-)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index ec4274d71145..5a3fff1971b9 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -3255,6 +3255,7 @@ static const struct mv88e6xxx_ops mv88e6190_ops = {
 	.vtu_getnext = mv88e6390_g1_vtu_getnext,
 	.vtu_loadpurge = mv88e6390_g1_vtu_loadpurge,
 	.serdes_power = mv88e6390_serdes_power,
+	.serdes_get_lane = mv88e6390_serdes_get_lane,
 	.serdes_irq_setup = mv88e6390_serdes_irq_setup,
 	.serdes_irq_free = mv88e6390_serdes_irq_free,
 	.gpio_ops = &mv88e6352_gpio_ops,
@@ -3301,6 +3302,7 @@ static const struct mv88e6xxx_ops mv88e6190x_ops = {
 	.vtu_getnext = mv88e6390_g1_vtu_getnext,
 	.vtu_loadpurge = mv88e6390_g1_vtu_loadpurge,
 	.serdes_power = mv88e6390x_serdes_power,
+	.serdes_get_lane = mv88e6390x_serdes_get_lane,
 	.serdes_irq_setup = mv88e6390x_serdes_irq_setup,
 	.serdes_irq_free = mv88e6390x_serdes_irq_free,
 	.gpio_ops = &mv88e6352_gpio_ops,
@@ -3347,6 +3349,7 @@ static const struct mv88e6xxx_ops mv88e6191_ops = {
 	.vtu_getnext = mv88e6390_g1_vtu_getnext,
 	.vtu_loadpurge = mv88e6390_g1_vtu_loadpurge,
 	.serdes_power = mv88e6390_serdes_power,
+	.serdes_get_lane = mv88e6390_serdes_get_lane,
 	.serdes_irq_setup = mv88e6390_serdes_irq_setup,
 	.serdes_irq_free = mv88e6390_serdes_irq_free,
 	.avb_ops = &mv88e6390_avb_ops,
@@ -3483,6 +3486,7 @@ static const struct mv88e6xxx_ops mv88e6290_ops = {
 	.vtu_getnext = mv88e6390_g1_vtu_getnext,
 	.vtu_loadpurge = mv88e6390_g1_vtu_loadpurge,
 	.serdes_power = mv88e6390_serdes_power,
+	.serdes_get_lane = mv88e6390_serdes_get_lane,
 	.serdes_irq_setup = mv88e6390_serdes_irq_setup,
 	.serdes_irq_free = mv88e6390_serdes_irq_free,
 	.gpio_ops = &mv88e6352_gpio_ops,
@@ -3800,6 +3804,7 @@ static const struct mv88e6xxx_ops mv88e6390_ops = {
 	.vtu_getnext = mv88e6390_g1_vtu_getnext,
 	.vtu_loadpurge = mv88e6390_g1_vtu_loadpurge,
 	.serdes_power = mv88e6390_serdes_power,
+	.serdes_get_lane = mv88e6390_serdes_get_lane,
 	.serdes_irq_setup = mv88e6390_serdes_irq_setup,
 	.serdes_irq_free = mv88e6390_serdes_irq_free,
 	.gpio_ops = &mv88e6352_gpio_ops,
@@ -3850,6 +3855,7 @@ static const struct mv88e6xxx_ops mv88e6390x_ops = {
 	.vtu_getnext = mv88e6390_g1_vtu_getnext,
 	.vtu_loadpurge = mv88e6390_g1_vtu_loadpurge,
 	.serdes_power = mv88e6390x_serdes_power,
+	.serdes_get_lane = mv88e6390x_serdes_get_lane,
 	.serdes_irq_setup = mv88e6390x_serdes_irq_setup,
 	.serdes_irq_free = mv88e6390x_serdes_irq_free,
 	.gpio_ops = &mv88e6352_gpio_ops,
diff --git a/drivers/net/dsa/mv88e6xxx/chip.h b/drivers/net/dsa/mv88e6xxx/chip.h
index a406be2f5652..15d0c9f00f54 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.h
+++ b/drivers/net/dsa/mv88e6xxx/chip.h
@@ -443,6 +443,9 @@ struct mv88e6xxx_ops {
 	/* Power on/off a SERDES interface */
 	int (*serdes_power)(struct mv88e6xxx_chip *chip, int port, bool on);
 
+	/* SERDES lane mapping */
+	int (*serdes_get_lane)(struct mv88e6xxx_chip *chip, int port, s8 *lane);
+
 	/* SERDES interrupt handling */
 	int (*serdes_irq_setup)(struct mv88e6xxx_chip *chip, int port);
 	void (*serdes_irq_free)(struct mv88e6xxx_chip *chip, int port);
diff --git a/drivers/net/dsa/mv88e6xxx/port.c b/drivers/net/dsa/mv88e6xxx/port.c
index c95cdb73e5a2..6a1fa5c72fdb 100644
--- a/drivers/net/dsa/mv88e6xxx/port.c
+++ b/drivers/net/dsa/mv88e6xxx/port.c
@@ -395,7 +395,7 @@ phy_interface_t mv88e6390x_port_max_speed_mode(int port)
 int mv88e6390x_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
 			      phy_interface_t mode)
 {
-	int lane;
+	s8 lane;
 	u16 cmode;
 	u16 reg;
 	int err;
@@ -434,9 +434,9 @@ int mv88e6390x_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
 	if (cmode == chip->ports[port].cmode)
 		return 0;
 
-	lane = mv88e6390x_serdes_get_lane(chip, port);
-	if (lane < 0 && lane != -ENODEV)
-		return lane;
+	err = mv88e6xxx_serdes_get_lane(chip, port, &lane);
+	if (err)
+		return err;
 
 	if (lane >= 0) {
 		if (chip->ports[port].serdes_irq) {
@@ -466,9 +466,9 @@ int mv88e6390x_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
 
 		chip->ports[port].cmode = cmode;
 
-		lane = mv88e6390x_serdes_get_lane(chip, port);
-		if (lane < 0)
-			return lane;
+		err = mv88e6xxx_serdes_get_lane(chip, port, &lane);
+		if (err)
+			return err;
 
 		err = mv88e6390x_serdes_power(chip, port, true);
 		if (err)
diff --git a/drivers/net/dsa/mv88e6xxx/serdes.c b/drivers/net/dsa/mv88e6xxx/serdes.c
index 678aaba3d019..a9209465e06b 100644
--- a/drivers/net/dsa/mv88e6xxx/serdes.c
+++ b/drivers/net/dsa/mv88e6xxx/serdes.c
@@ -286,36 +286,33 @@ void mv88e6352_serdes_irq_free(struct mv88e6xxx_chip *chip, int port)
 	chip->ports[port].serdes_irq = 0;
 }
 
-/* Return the SERDES lane address a port is using. Only Ports 9 and 10
- * have SERDES lanes. Returns -ENODEV if a port does not have a lane.
- */
-static int mv88e6390_serdes_get_lane(struct mv88e6xxx_chip *chip, int port)
+int mv88e6390_serdes_get_lane(struct mv88e6xxx_chip *chip, int port, s8 *lane)
 {
 	u8 cmode = chip->ports[port].cmode;
 
+	*lane = -1;
+
 	switch (port) {
 	case 9:
 		if (cmode == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
 		    cmode == MV88E6XXX_PORT_STS_CMODE_SGMII ||
 		    cmode == MV88E6XXX_PORT_STS_CMODE_2500BASEX)
-			return MV88E6390_PORT9_LANE0;
-		return -ENODEV;
+			*lane = MV88E6390_PORT9_LANE0;
+		break;
 	case 10:
 		if (cmode == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
 		    cmode == MV88E6XXX_PORT_STS_CMODE_SGMII ||
 		    cmode == MV88E6XXX_PORT_STS_CMODE_2500BASEX)
-			return MV88E6390_PORT10_LANE0;
-		return -ENODEV;
+			*lane = MV88E6390_PORT10_LANE0;
+		break;
 	default:
-		return -ENODEV;
+		break;
 	}
+
+	return *lane == -1 ? -ENODEV : 0;
 }
 
-/* Return the SERDES lane address a port is using. Ports 9 and 10 can
- * use multiple lanes. If so, return the first lane the port uses.
- * Returns -ENODEV if a port does not have a lane.
- */
-int mv88e6390x_serdes_get_lane(struct mv88e6xxx_chip *chip, int port)
+int mv88e6390x_serdes_get_lane(struct mv88e6xxx_chip *chip, int port, s8 *lane)
 {
 	u8 cmode_port9, cmode_port10, cmode_port;
 
@@ -323,76 +320,80 @@ int mv88e6390x_serdes_get_lane(struct mv88e6xxx_chip *chip, int port)
 	cmode_port10 = chip->ports[10].cmode;
 	cmode_port = chip->ports[port].cmode;
 
+	*lane = -1;
+
 	switch (port) {
 	case 2:
 		if (cmode_port9 == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
 		    cmode_port9 == MV88E6XXX_PORT_STS_CMODE_SGMII ||
 		    cmode_port9 == MV88E6XXX_PORT_STS_CMODE_2500BASEX)
 			if (cmode_port == MV88E6XXX_PORT_STS_CMODE_1000BASE_X)
-				return MV88E6390_PORT9_LANE1;
-		return -ENODEV;
+				*lane = MV88E6390_PORT9_LANE1;
+		break;
 	case 3:
 		if (cmode_port9 == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
 		    cmode_port9 == MV88E6XXX_PORT_STS_CMODE_SGMII ||
 		    cmode_port9 == MV88E6XXX_PORT_STS_CMODE_2500BASEX ||
 		    cmode_port9 == MV88E6XXX_PORT_STS_CMODE_RXAUI)
 			if (cmode_port == MV88E6XXX_PORT_STS_CMODE_1000BASE_X)
-				return MV88E6390_PORT9_LANE2;
-		return -ENODEV;
+				*lane = MV88E6390_PORT9_LANE2;
+		break;
 	case 4:
 		if (cmode_port9 == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
 		    cmode_port9 == MV88E6XXX_PORT_STS_CMODE_SGMII ||
 		    cmode_port9 == MV88E6XXX_PORT_STS_CMODE_2500BASEX ||
 		    cmode_port9 == MV88E6XXX_PORT_STS_CMODE_RXAUI)
 			if (cmode_port == MV88E6XXX_PORT_STS_CMODE_1000BASE_X)
-				return MV88E6390_PORT9_LANE3;
-		return -ENODEV;
+				*lane = MV88E6390_PORT9_LANE3;
+		break;
 	case 5:
 		if (cmode_port10 == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
 		    cmode_port10 == MV88E6XXX_PORT_STS_CMODE_SGMII ||
 		    cmode_port10 == MV88E6XXX_PORT_STS_CMODE_2500BASEX)
 			if (cmode_port == MV88E6XXX_PORT_STS_CMODE_1000BASE_X)
-				return MV88E6390_PORT10_LANE1;
-		return -ENODEV;
+				*lane = MV88E6390_PORT10_LANE1;
+		break;
 	case 6:
 		if (cmode_port10 == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
 		    cmode_port10 == MV88E6XXX_PORT_STS_CMODE_SGMII ||
 		    cmode_port10 == MV88E6XXX_PORT_STS_CMODE_2500BASEX ||
 		    cmode_port10 == MV88E6XXX_PORT_STS_CMODE_RXAUI)
 			if (cmode_port == MV88E6XXX_PORT_STS_CMODE_1000BASE_X)
-				return MV88E6390_PORT10_LANE2;
-		return -ENODEV;
+				*lane = MV88E6390_PORT10_LANE2;
+		break;
 	case 7:
 		if (cmode_port10 == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
 		    cmode_port10 == MV88E6XXX_PORT_STS_CMODE_SGMII ||
 		    cmode_port10 == MV88E6XXX_PORT_STS_CMODE_2500BASEX ||
 		    cmode_port10 == MV88E6XXX_PORT_STS_CMODE_RXAUI)
 			if (cmode_port == MV88E6XXX_PORT_STS_CMODE_1000BASE_X)
-				return MV88E6390_PORT10_LANE3;
-		return -ENODEV;
+				*lane = MV88E6390_PORT10_LANE3;
+		break;
 	case 9:
 		if (cmode_port9 == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
 		    cmode_port9 == MV88E6XXX_PORT_STS_CMODE_SGMII ||
 		    cmode_port9 == MV88E6XXX_PORT_STS_CMODE_2500BASEX ||
 		    cmode_port9 == MV88E6XXX_PORT_STS_CMODE_XAUI ||
 		    cmode_port9 == MV88E6XXX_PORT_STS_CMODE_RXAUI)
-			return MV88E6390_PORT9_LANE0;
-		return -ENODEV;
+			*lane = MV88E6390_PORT9_LANE0;
+		break;
 	case 10:
 		if (cmode_port10 == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
 		    cmode_port10 == MV88E6XXX_PORT_STS_CMODE_SGMII ||
 		    cmode_port10 == MV88E6XXX_PORT_STS_CMODE_2500BASEX ||
 		    cmode_port10 == MV88E6XXX_PORT_STS_CMODE_XAUI ||
 		    cmode_port10 == MV88E6XXX_PORT_STS_CMODE_RXAUI)
-			return MV88E6390_PORT10_LANE0;
-		return -ENODEV;
+			*lane = MV88E6390_PORT10_LANE0;
+		break;
 	default:
-		return -ENODEV;
+		break;
 	}
+
+	return *lane == -1 ? -ENODEV : 0;
 }
 
 /* Set the power on/off for 10GBASE-R and 10GBASE-X4/X2 */
-static int mv88e6390_serdes_power_10g(struct mv88e6xxx_chip *chip, int lane,
+static int mv88e6390_serdes_power_10g(struct mv88e6xxx_chip *chip, s8 lane,
 				      bool on)
 {
 	u16 val, new_val;
@@ -419,7 +420,7 @@ static int mv88e6390_serdes_power_10g(struct mv88e6xxx_chip *chip, int lane,
 }
 
 /* Set the power on/off for SGMII and 1000Base-X */
-static int mv88e6390_serdes_power_sgmii(struct mv88e6xxx_chip *chip, int lane,
+static int mv88e6390_serdes_power_sgmii(struct mv88e6xxx_chip *chip, s8 lane,
 					bool on)
 {
 	u16 val, new_val;
@@ -445,7 +446,7 @@ static int mv88e6390_serdes_power_sgmii(struct mv88e6xxx_chip *chip, int lane,
 }
 
 static int mv88e6390_serdes_power_lane(struct mv88e6xxx_chip *chip, int port,
-				       int lane, bool on)
+				       s8 lane, bool on)
 {
 	u8 cmode = chip->ports[port].cmode;
 
@@ -464,14 +465,14 @@ static int mv88e6390_serdes_power_lane(struct mv88e6xxx_chip *chip, int port,
 
 int mv88e6390_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on)
 {
-	int lane;
-
-	lane = mv88e6390_serdes_get_lane(chip, port);
-	if (lane == -ENODEV)
-		return 0;
+	s8 lane;
+	int err;
 
+	err = mv88e6xxx_serdes_get_lane(chip, port, &lane);
+	if (err)
+		return err;
 	if (lane < 0)
-		return lane;
+		return 0;
 
 	switch (port) {
 	case 9 ... 10:
@@ -483,14 +484,14 @@ int mv88e6390_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on)
 
 int mv88e6390x_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on)
 {
-	int lane;
-
-	lane = mv88e6390x_serdes_get_lane(chip, port);
-	if (lane == -ENODEV)
-		return 0;
+	s8 lane;
+	int err;
 
+	err = mv88e6xxx_serdes_get_lane(chip, port, &lane);
+	if (err)
+		return err;
 	if (lane < 0)
-		return lane;
+		return 0;
 
 	switch (port) {
 	case 2 ... 4:
@@ -503,7 +504,7 @@ int mv88e6390x_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on)
 }
 
 static void mv88e6390_serdes_irq_link_sgmii(struct mv88e6xxx_chip *chip,
-					    int port, int lane)
+					    int port, s8 lane)
 {
 	u8 cmode = chip->ports[port].cmode;
 	struct dsa_switch *ds = chip->ds;
@@ -570,7 +571,7 @@ static void mv88e6390_serdes_irq_link_sgmii(struct mv88e6xxx_chip *chip,
 }
 
 static int mv88e6390_serdes_irq_enable_sgmii(struct mv88e6xxx_chip *chip,
-					     int lane)
+					     s8 lane)
 {
 	return mv88e6390_serdes_write(chip, lane, MDIO_MMD_PHYXS,
 				      MV88E6390_SGMII_INT_ENABLE,
@@ -579,14 +580,14 @@ static int mv88e6390_serdes_irq_enable_sgmii(struct mv88e6xxx_chip *chip,
 }
 
 static int mv88e6390_serdes_irq_disable_sgmii(struct mv88e6xxx_chip *chip,
-					      int lane)
+					      s8 lane)
 {
 	return mv88e6390_serdes_write(chip, lane, MDIO_MMD_PHYXS,
 				      MV88E6390_SGMII_INT_ENABLE, 0);
 }
 
 int mv88e6390_serdes_irq_enable(struct mv88e6xxx_chip *chip, int port,
-				int lane)
+				s8 lane)
 {
 	u8 cmode = chip->ports[port].cmode;
 	int err = 0;
@@ -602,7 +603,7 @@ int mv88e6390_serdes_irq_enable(struct mv88e6xxx_chip *chip, int port,
 }
 
 int mv88e6390_serdes_irq_disable(struct mv88e6xxx_chip *chip, int port,
-				 int lane)
+				 s8 lane)
 {
 	u8 cmode = chip->ports[port].cmode;
 	int err = 0;
@@ -618,7 +619,7 @@ int mv88e6390_serdes_irq_disable(struct mv88e6xxx_chip *chip, int port,
 }
 
 static int mv88e6390_serdes_irq_status_sgmii(struct mv88e6xxx_chip *chip,
-					     int lane, u16 *status)
+					     s8 lane, u16 *status)
 {
 	int err;
 
@@ -635,10 +636,10 @@ static irqreturn_t mv88e6390_serdes_thread_fn(int irq, void *dev_id)
 	irqreturn_t ret = IRQ_NONE;
 	u8 cmode = port->cmode;
 	u16 status;
-	int lane;
 	int err;
+	s8 lane;
 
-	lane = mv88e6390x_serdes_get_lane(chip, port->port);
+	mv88e6xxx_serdes_get_lane(chip, port->port, &lane);
 
 	mv88e6xxx_reg_lock(chip);
 
@@ -663,16 +664,14 @@ static irqreturn_t mv88e6390_serdes_thread_fn(int irq, void *dev_id)
 
 int mv88e6390x_serdes_irq_setup(struct mv88e6xxx_chip *chip, int port)
 {
-	int lane;
 	int err;
+	s8 lane;
 
-	lane = mv88e6390x_serdes_get_lane(chip, port);
-
-	if (lane == -ENODEV)
-		return 0;
-
+	err = mv88e6xxx_serdes_get_lane(chip, port, &lane);
+	if (err)
+		return err;
 	if (lane < 0)
-		return lane;
+		return 0;
 
 	chip->ports[port].serdes_irq = irq_find_mapping(chip->g2_irq.domain,
 							port);
@@ -711,11 +710,14 @@ int mv88e6390_serdes_irq_setup(struct mv88e6xxx_chip *chip, int port)
 
 void mv88e6390x_serdes_irq_free(struct mv88e6xxx_chip *chip, int port)
 {
-	int lane = mv88e6390x_serdes_get_lane(chip, port);
+	int err;
+	s8 lane;
 
-	if (lane == -ENODEV)
+	err = mv88e6xxx_serdes_get_lane(chip, port, &lane);
+	if (err) {
+		dev_err(chip->dev, "Unable to free SERDES irq: %d\n", err);
 		return;
-
+	}
 	if (lane < 0)
 		return;
 
diff --git a/drivers/net/dsa/mv88e6xxx/serdes.h b/drivers/net/dsa/mv88e6xxx/serdes.h
index ff5b94439335..1ddb8fb3aab9 100644
--- a/drivers/net/dsa/mv88e6xxx/serdes.h
+++ b/drivers/net/dsa/mv88e6xxx/serdes.h
@@ -74,7 +74,21 @@
 #define MV88E6390_SGMII_PHY_STATUS_SPD_DPL_VALID BIT(11)
 #define MV88E6390_SGMII_PHY_STATUS_LINK		BIT(10)
 
-int mv88e6390x_serdes_get_lane(struct mv88e6xxx_chip *chip, int port);
+/* Put the SERDES lane address a port is using into *lane. If a port has
+ * multiple lanes, should put the first lane the port is using. If a port does
+ * not have a lane, put -1 into *lane.
+ */
+static inline int mv88e6xxx_serdes_get_lane(struct mv88e6xxx_chip *chip,
+					    int port, s8 *lane)
+{
+	if (!chip->info->ops->serdes_get_lane)
+		return -EOPNOTSUPP;
+
+	return chip->info->ops->serdes_get_lane(chip, port, lane);
+}
+
+int mv88e6390_serdes_get_lane(struct mv88e6xxx_chip *chip, int port, s8 *lane);
+int mv88e6390x_serdes_get_lane(struct mv88e6xxx_chip *chip, int port, s8 *lane);
 int mv88e6341_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on);
 int mv88e6352_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on);
 int mv88e6390_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on);
@@ -89,9 +103,9 @@ int mv88e6352_serdes_get_strings(struct mv88e6xxx_chip *chip,
 int mv88e6352_serdes_get_stats(struct mv88e6xxx_chip *chip, int port,
 			       uint64_t *data);
 int mv88e6390_serdes_irq_enable(struct mv88e6xxx_chip *chip, int port,
-				int lane);
+				s8 lane);
 int mv88e6390_serdes_irq_disable(struct mv88e6xxx_chip *chip, int port,
-				 int lane);
+				 s8 lane);
 int mv88e6352_serdes_irq_setup(struct mv88e6xxx_chip *chip, int port);
 void mv88e6352_serdes_irq_free(struct mv88e6xxx_chip *chip, int port);
 
-- 
2.21.0

Re: [PATCH net-next v3 3/6] net: dsa: mv88e6xxx: create serdes_get_lane chip operation

[Vivien Didelot]

Hi Marek,

On Sun, 25 Aug 2019 05:59:12 +0200, Marek Behún <marek.behun@nic.cz> wrote:
>  void mv88e6390x_serdes_irq_free(struct mv88e6xxx_chip *chip, int port)
>  {
> -	int lane = mv88e6390x_serdes_get_lane(chip, port);
> +	int err;
> +	s8 lane;
>  
> -	if (lane == -ENODEV)
> +	err = mv88e6xxx_serdes_get_lane(chip, port, &lane);
> +	if (err) {
> +		dev_err(chip->dev, "Unable to free SERDES irq: %d\n", err);
>  		return;
> -
> +	}
>  	if (lane < 0)
>  		return;

[...]

> -int mv88e6390x_serdes_get_lane(struct mv88e6xxx_chip *chip, int port);
> +/* Put the SERDES lane address a port is using into *lane. If a port has
> + * multiple lanes, should put the first lane the port is using. If a port does
> + * not have a lane, put -1 into *lane.
> + */
> +static inline int mv88e6xxx_serdes_get_lane(struct mv88e6xxx_chip *chip,
> +					    int port, s8 *lane)
> +{
> +	if (!chip->info->ops->serdes_get_lane)
> +		return -EOPNOTSUPP;
> +
> +	return chip->info->ops->serdes_get_lane(chip, port, lane);
> +}

Using an invalid value is only useful if it can be interpreted by the other
functions of the API. So I would've make lane an u8, assuming it gets modified
only on success, which would result in calls like this one:

    u8 lane;
    int err;

    err = mv88e6xxx_serdes_get_lane(chip, port, &lane);
    if (err) {
        if (err == -ENODEV)
            err = 0;
        return err;
    }

But at least it is well documented, so we can eventually fine tuned later:

Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com>


Thank you!

	Vivien

Re: [PATCH net-next v3 3/6] net: dsa: mv88e6xxx: create serdes_get_lane chip operation

[Vivien Didelot]

On Sun, 25 Aug 2019 05:59:12 +0200, Marek Behún <marek.behun@nic.cz> wrote:
>  int mv88e6390_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on)
>  {
> -	int lane;
> -
> -	lane = mv88e6390_serdes_get_lane(chip, port);
> -	if (lane == -ENODEV)
> -		return 0;
> +	s8 lane;
> +	int err;
>  
> +	err = mv88e6xxx_serdes_get_lane(chip, port, &lane);
> +	if (err)
> +		return err;
>  	if (lane < 0)
> -		return lane;
> +		return 0;

In fact you're also relying on -ENODEV, which is what you return here (and in
other places) instead of 0. So I'm afraid you have to address my comment now...

Re: [PATCH net-next v3 3/6] net: dsa: mv88e6xxx: create serdes_get_lane chip operation

[Marek Behun]

On Sun, 25 Aug 2019 12:12:14 -0400
Vivien Didelot <vivien.didelot@gmail.com> wrote:

> In fact you're also relying on -ENODEV, which is what you return here (and in
> other places) instead of 0. So I'm afraid you have to address my comment now...

Vivien, you are right. I returned -ENODEV for Peridot when no lane was
to be on port. It should return 0.
I am sending v4 now with this corrected, and tested on Turris Mox with
combinations Peridot, Topaz and Peridot + Topaz.

Marek

[PATCH net-next v3 4/6] net: dsa: mv88e6xxx: simplify SERDES code for Topaz and Peridot

[Marek Behún]

By adding an additional serdes_get_lane implementation (for Topaz), we
can merge the implementations of other SERDES functions (powering and
IRQs). We can skip checking port numbers, since the serdes_get_lane()
methods inform if there is no lane on a port or if the lane cannot be
used for given cmode.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
---
 drivers/net/dsa/mv88e6xxx/chip.c   |  18 ++---
 drivers/net/dsa/mv88e6xxx/port.c   |   4 +-
 drivers/net/dsa/mv88e6xxx/serdes.c | 104 ++++++++---------------------
 drivers/net/dsa/mv88e6xxx/serdes.h |   7 +-
 4 files changed, 42 insertions(+), 91 deletions(-)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 5a3fff1971b9..202ccce65b1c 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -2927,7 +2927,8 @@ static const struct mv88e6xxx_ops mv88e6141_ops = {
 	.reset = mv88e6352_g1_reset,
 	.vtu_getnext = mv88e6352_g1_vtu_getnext,
 	.vtu_loadpurge = mv88e6352_g1_vtu_loadpurge,
-	.serdes_power = mv88e6341_serdes_power,
+	.serdes_power = mv88e6390_serdes_power,
+	.serdes_get_lane = mv88e6341_serdes_get_lane,
 	.gpio_ops = &mv88e6352_gpio_ops,
 	.phylink_validate = mv88e6341_phylink_validate,
 };
@@ -3301,10 +3302,10 @@ static const struct mv88e6xxx_ops mv88e6190x_ops = {
 	.rmu_disable = mv88e6390_g1_rmu_disable,
 	.vtu_getnext = mv88e6390_g1_vtu_getnext,
 	.vtu_loadpurge = mv88e6390_g1_vtu_loadpurge,
-	.serdes_power = mv88e6390x_serdes_power,
+	.serdes_power = mv88e6390_serdes_power,
 	.serdes_get_lane = mv88e6390x_serdes_get_lane,
-	.serdes_irq_setup = mv88e6390x_serdes_irq_setup,
-	.serdes_irq_free = mv88e6390x_serdes_irq_free,
+	.serdes_irq_setup = mv88e6390_serdes_irq_setup,
+	.serdes_irq_free = mv88e6390_serdes_irq_free,
 	.gpio_ops = &mv88e6352_gpio_ops,
 	.phylink_validate = mv88e6390x_phylink_validate,
 };
@@ -3621,7 +3622,8 @@ static const struct mv88e6xxx_ops mv88e6341_ops = {
 	.reset = mv88e6352_g1_reset,
 	.vtu_getnext = mv88e6352_g1_vtu_getnext,
 	.vtu_loadpurge = mv88e6352_g1_vtu_loadpurge,
-	.serdes_power = mv88e6341_serdes_power,
+	.serdes_power = mv88e6390_serdes_power,
+	.serdes_get_lane = mv88e6341_serdes_get_lane,
 	.gpio_ops = &mv88e6352_gpio_ops,
 	.avb_ops = &mv88e6390_avb_ops,
 	.ptp_ops = &mv88e6352_ptp_ops,
@@ -3854,10 +3856,10 @@ static const struct mv88e6xxx_ops mv88e6390x_ops = {
 	.rmu_disable = mv88e6390_g1_rmu_disable,
 	.vtu_getnext = mv88e6390_g1_vtu_getnext,
 	.vtu_loadpurge = mv88e6390_g1_vtu_loadpurge,
-	.serdes_power = mv88e6390x_serdes_power,
+	.serdes_power = mv88e6390_serdes_power,
 	.serdes_get_lane = mv88e6390x_serdes_get_lane,
-	.serdes_irq_setup = mv88e6390x_serdes_irq_setup,
-	.serdes_irq_free = mv88e6390x_serdes_irq_free,
+	.serdes_irq_setup = mv88e6390_serdes_irq_setup,
+	.serdes_irq_free = mv88e6390_serdes_irq_free,
 	.gpio_ops = &mv88e6352_gpio_ops,
 	.avb_ops = &mv88e6390_avb_ops,
 	.ptp_ops = &mv88e6352_ptp_ops,
diff --git a/drivers/net/dsa/mv88e6xxx/port.c b/drivers/net/dsa/mv88e6xxx/port.c
index 6a1fa5c72fdb..d20be5327640 100644
--- a/drivers/net/dsa/mv88e6xxx/port.c
+++ b/drivers/net/dsa/mv88e6xxx/port.c
@@ -445,7 +445,7 @@ int mv88e6390x_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
 				return err;
 		}
 
-		err = mv88e6390x_serdes_power(chip, port, false);
+		err = mv88e6390_serdes_power(chip, port, false);
 		if (err)
 			return err;
 	}
@@ -470,7 +470,7 @@ int mv88e6390x_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
 		if (err)
 			return err;
 
-		err = mv88e6390x_serdes_power(chip, port, true);
+		err = mv88e6390_serdes_power(chip, port, true);
 		if (err)
 			return err;
 
diff --git a/drivers/net/dsa/mv88e6xxx/serdes.c b/drivers/net/dsa/mv88e6xxx/serdes.c
index a9209465e06b..1946ccb6694c 100644
--- a/drivers/net/dsa/mv88e6xxx/serdes.c
+++ b/drivers/net/dsa/mv88e6xxx/serdes.c
@@ -286,6 +286,23 @@ void mv88e6352_serdes_irq_free(struct mv88e6xxx_chip *chip, int port)
 	chip->ports[port].serdes_irq = 0;
 }
 
+int mv88e6341_serdes_get_lane(struct mv88e6xxx_chip *chip, int port, s8 *lane)
+{
+	u8 cmode = chip->ports[port].cmode;
+
+	*lane = -1;
+
+	if (port != 5)
+		return 0;
+
+	if (cmode == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
+	    cmode == MV88E6XXX_PORT_STS_CMODE_SGMII ||
+	    cmode == MV88E6XXX_PORT_STS_CMODE_2500BASEX)
+		*lane = MV88E6341_PORT5_LANE;
+
+	return 0;
+}
+
 int mv88e6390_serdes_get_lane(struct mv88e6xxx_chip *chip, int port, s8 *lane)
 {
 	u8 cmode = chip->ports[port].cmode;
@@ -445,26 +462,9 @@ static int mv88e6390_serdes_power_sgmii(struct mv88e6xxx_chip *chip, s8 lane,
 	return err;
 }
 
-static int mv88e6390_serdes_power_lane(struct mv88e6xxx_chip *chip, int port,
-				       s8 lane, bool on)
-{
-	u8 cmode = chip->ports[port].cmode;
-
-	switch (cmode) {
-	case MV88E6XXX_PORT_STS_CMODE_SGMII:
-	case MV88E6XXX_PORT_STS_CMODE_1000BASE_X:
-	case MV88E6XXX_PORT_STS_CMODE_2500BASEX:
-		return mv88e6390_serdes_power_sgmii(chip, lane, on);
-	case MV88E6XXX_PORT_STS_CMODE_XAUI:
-	case MV88E6XXX_PORT_STS_CMODE_RXAUI:
-		return mv88e6390_serdes_power_10g(chip, lane, on);
-	}
-
-	return 0;
-}
-
 int mv88e6390_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on)
 {
+	u8 cmode = chip->ports[port].cmode;
 	s8 lane;
 	int err;
 
@@ -474,30 +474,14 @@ int mv88e6390_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on)
 	if (lane < 0)
 		return 0;
 
-	switch (port) {
-	case 9 ... 10:
-		return mv88e6390_serdes_power_lane(chip, port, lane, on);
-	}
-
-	return 0;
-}
-
-int mv88e6390x_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on)
-{
-	s8 lane;
-	int err;
-
-	err = mv88e6xxx_serdes_get_lane(chip, port, &lane);
-	if (err)
-		return err;
-	if (lane < 0)
-		return 0;
-
-	switch (port) {
-	case 2 ... 4:
-	case 5 ... 7:
-	case 9 ... 10:
-		return mv88e6390_serdes_power_lane(chip, port, lane, on);
+	switch (cmode) {
+	case MV88E6XXX_PORT_STS_CMODE_SGMII:
+	case MV88E6XXX_PORT_STS_CMODE_1000BASE_X:
+	case MV88E6XXX_PORT_STS_CMODE_2500BASEX:
+		return mv88e6390_serdes_power_sgmii(chip, lane, on);
+	case MV88E6XXX_PORT_STS_CMODE_XAUI:
+	case MV88E6XXX_PORT_STS_CMODE_RXAUI:
+		return mv88e6390_serdes_power_10g(chip, lane, on);
 	}
 
 	return 0;
@@ -662,7 +646,7 @@ static irqreturn_t mv88e6390_serdes_thread_fn(int irq, void *dev_id)
 	return ret;
 }
 
-int mv88e6390x_serdes_irq_setup(struct mv88e6xxx_chip *chip, int port)
+int mv88e6390_serdes_irq_setup(struct mv88e6xxx_chip *chip, int port)
 {
 	int err;
 	s8 lane;
@@ -700,15 +684,7 @@ int mv88e6390x_serdes_irq_setup(struct mv88e6xxx_chip *chip, int port)
 	return mv88e6390_serdes_irq_enable(chip, port, lane);
 }
 
-int mv88e6390_serdes_irq_setup(struct mv88e6xxx_chip *chip, int port)
-{
-	if (port < 9)
-		return 0;
-
-	return mv88e6390x_serdes_irq_setup(chip, port);
-}
-
-void mv88e6390x_serdes_irq_free(struct mv88e6xxx_chip *chip, int port)
+void mv88e6390_serdes_irq_free(struct mv88e6xxx_chip *chip, int port)
 {
 	int err;
 	s8 lane;
@@ -732,27 +708,3 @@ void mv88e6390x_serdes_irq_free(struct mv88e6xxx_chip *chip, int port)
 
 	chip->ports[port].serdes_irq = 0;
 }
-
-void mv88e6390_serdes_irq_free(struct mv88e6xxx_chip *chip, int port)
-{
-	if (port < 9)
-		return;
-
-	mv88e6390x_serdes_irq_free(chip, port);
-}
-
-int mv88e6341_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on)
-{
-	u8 cmode = chip->ports[port].cmode;
-
-	if (port != 5)
-		return 0;
-
-	if (cmode == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
-	    cmode == MV88E6XXX_PORT_STS_CMODE_SGMII ||
-	    cmode == MV88E6XXX_PORT_STS_CMODE_2500BASEX)
-		return mv88e6390_serdes_power_sgmii(chip, MV88E6341_ADDR_SERDES,
-						    on);
-
-	return 0;
-}
diff --git a/drivers/net/dsa/mv88e6xxx/serdes.h b/drivers/net/dsa/mv88e6xxx/serdes.h
index 1ddb8fb3aab9..7fded708b05d 100644
--- a/drivers/net/dsa/mv88e6xxx/serdes.h
+++ b/drivers/net/dsa/mv88e6xxx/serdes.h
@@ -28,7 +28,7 @@
 #define MV88E6352_SERDES_INT_STATUS	0x13
 
 
-#define MV88E6341_ADDR_SERDES		0x15
+#define MV88E6341_PORT5_LANE		0x15
 
 #define MV88E6390_PORT9_LANE0		0x09
 #define MV88E6390_PORT9_LANE1		0x12
@@ -87,16 +87,13 @@ static inline int mv88e6xxx_serdes_get_lane(struct mv88e6xxx_chip *chip,
 	return chip->info->ops->serdes_get_lane(chip, port, lane);
 }
 
+int mv88e6341_serdes_get_lane(struct mv88e6xxx_chip *chip, int port, s8 *lane);
 int mv88e6390_serdes_get_lane(struct mv88e6xxx_chip *chip, int port, s8 *lane);
 int mv88e6390x_serdes_get_lane(struct mv88e6xxx_chip *chip, int port, s8 *lane);
-int mv88e6341_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on);
 int mv88e6352_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on);
 int mv88e6390_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on);
-int mv88e6390x_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on);
 int mv88e6390_serdes_irq_setup(struct mv88e6xxx_chip *chip, int port);
 void mv88e6390_serdes_irq_free(struct mv88e6xxx_chip *chip, int port);
-int mv88e6390x_serdes_irq_setup(struct mv88e6xxx_chip *chip, int port);
-void mv88e6390x_serdes_irq_free(struct mv88e6xxx_chip *chip, int port);
 int mv88e6352_serdes_get_sset_count(struct mv88e6xxx_chip *chip, int port);
 int mv88e6352_serdes_get_strings(struct mv88e6xxx_chip *chip,
 				 int port, uint8_t *data);
-- 
2.21.0

Re: [PATCH net-next v3 4/6] net: dsa: mv88e6xxx: simplify SERDES code for Topaz and Peridot

[Vivien Didelot]

Hi Marek,

On Sun, 25 Aug 2019 05:59:13 +0200, Marek Behún <marek.behun@nic.cz> wrote:
> +int mv88e6341_serdes_get_lane(struct mv88e6xxx_chip *chip, int port, s8 *lane)
> +{
> +	u8 cmode = chip->ports[port].cmode;
> +
> +	*lane = -1;
> +
> +	if (port != 5)
> +		return 0;

Aren't you relying on -ENODEV as well?

> +
> +	if (cmode == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
> +	    cmode == MV88E6XXX_PORT_STS_CMODE_SGMII ||
> +	    cmode == MV88E6XXX_PORT_STS_CMODE_2500BASEX)
> +		*lane = MV88E6341_PORT5_LANE;
> +
> +	return 0;
> +}

Re: [PATCH net-next v3 4/6] net: dsa: mv88e6xxx: simplify SERDES code for Topaz and Peridot

[Marek Behun]

On Sun, 25 Aug 2019 12:02:32 -0400
Vivien Didelot <vivien.didelot@gmail.com> wrote:

> Aren't you relying on -ENODEV as well?

Vivien, I am not relying o -ENODEV. I changed the serdes_get_lane
semantics:
 - previously:
   - if port has a lane for current cmode, return given lane number
   - otherwise return -ENODEV
   - if other error occured during serdes_get_lane, return that error
     (this never happened, because all implementations only need port
     number and cmode, and cmode is cached, so no function was called
     that could err)
 - after this commit:
   - if port has a lane for current cmode, return 0 and put lane number
     into *lane
   - otherwise return 0 and put -1 into *lane
   - if error occured, return that error number

I removed the -ENODEV semantics for "no lane on port" event.
There are two reasons for this:
  1. once you requested lane number to be put into a place pointed to
     by a pointer, rather than the return value, the code seemed better
     to me (you may of course disagree, this is a personal opinion) when
     I did:
       if (err)
           return err;
       if (lane < 0)
           return 0;
     rather than
       if (err == -ENODEV)
           return 0;
       if (err)
           return err;
  2. some future implementation may actually need to call some MDIO
     read/write functions, which may or may not return -ENODEV. That
     could conflict with the -ENODEV returned when there is no lane.

Marek

Re: [PATCH net-next v3 4/6] net: dsa: mv88e6xxx: simplify SERDES code for Topaz and Peridot

[Vivien Didelot]

Hi Marek,

On Sun, 25 Aug 2019 18:36:09 +0200, Marek Behun <marek.behun@nic.cz> wrote:
> > Aren't you relying on -ENODEV as well?
> 
> Vivien, I am not relying o -ENODEV. I changed the serdes_get_lane
> semantics:
>  - previously:
>    - if port has a lane for current cmode, return given lane number
>    - otherwise return -ENODEV
>    - if other error occured during serdes_get_lane, return that error
>      (this never happened, because all implementations only need port
>      number and cmode, and cmode is cached, so no function was called
>      that could err)
>  - after this commit:
>    - if port has a lane for current cmode, return 0 and put lane number
>      into *lane
>    - otherwise return 0 and put -1 into *lane
>    - if error occured, return that error number
> 
> I removed the -ENODEV semantics for "no lane on port" event.
> There are two reasons for this:
>   1. once you requested lane number to be put into a place pointed to
>      by a pointer, rather than the return value, the code seemed better
>      to me (you may of course disagree, this is a personal opinion) when
>      I did:
>        if (err)
>            return err;
>        if (lane < 0)
>            return 0;
>      rather than
>        if (err == -ENODEV)
>            return 0;
>        if (err)
>            return err;

A single return path for invalid queries, eventually checking a specific
error, is always more idiomatic and better than checking two places which
could lead in mistakes as your previous patch did. So this is more readable:

    if (err)
        return err;

or:

    if (err && err != -ENODEV)
        return err;

or:

    if (err) {
        if (err = -ENODEV)
            err = 0;
        return err;
    }

>   2. some future implementation may actually need to call some MDIO
>      read/write functions, which may or may not return -ENODEV. That
>      could conflict with the -ENODEV returned when there is no lane.

The current code is already using -ENODEV to inform about "no lane for port",
even if it can be used by lower level functions, same as -EINVAL. That is fine.

So if you have to respin the series again, I would really prefer to see an
unsigned lane parameter, otherwise, fine...


Thanks,

	Vivien

[PATCH net-next v3 5/6] net: dsa: mv88e6xxx: rename port cmode macro

[Marek Behún]

This is a cosmetic update. We are removing the last underscore from
macros MV88E6XXX_PORT_STS_CMODE_100BASE_X and
MV88E6XXX_PORT_STS_CMODE_1000BASE_X. The 2500base-x version does not
have that underscore. Also PHY_INTERFACE_MODE_ macros do not have it
there.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
---
 drivers/net/dsa/mv88e6xxx/port.c   |  4 +--
 drivers/net/dsa/mv88e6xxx/port.h   |  4 +--
 drivers/net/dsa/mv88e6xxx/serdes.c | 48 +++++++++++++++---------------
 3 files changed, 28 insertions(+), 28 deletions(-)

diff --git a/drivers/net/dsa/mv88e6xxx/port.c b/drivers/net/dsa/mv88e6xxx/port.c
index d20be5327640..7183c94a92ec 100644
--- a/drivers/net/dsa/mv88e6xxx/port.c
+++ b/drivers/net/dsa/mv88e6xxx/port.c
@@ -411,7 +411,7 @@ int mv88e6390x_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
 
 	switch (mode) {
 	case PHY_INTERFACE_MODE_1000BASEX:
-		cmode = MV88E6XXX_PORT_STS_CMODE_1000BASE_X;
+		cmode = MV88E6XXX_PORT_STS_CMODE_1000BASEX;
 		break;
 	case PHY_INTERFACE_MODE_SGMII:
 		cmode = MV88E6XXX_PORT_STS_CMODE_SGMII;
@@ -618,7 +618,7 @@ int mv88e6352_port_link_state(struct mv88e6xxx_chip *chip, int port,
 		else
 			state->interface = PHY_INTERFACE_MODE_RGMII;
 		break;
-	case MV88E6XXX_PORT_STS_CMODE_1000BASE_X:
+	case MV88E6XXX_PORT_STS_CMODE_1000BASEX:
 		state->interface = PHY_INTERFACE_MODE_1000BASEX;
 		break;
 	case MV88E6XXX_PORT_STS_CMODE_SGMII:
diff --git a/drivers/net/dsa/mv88e6xxx/port.h b/drivers/net/dsa/mv88e6xxx/port.h
index 64c73fd171ee..04550cb3c3b3 100644
--- a/drivers/net/dsa/mv88e6xxx/port.h
+++ b/drivers/net/dsa/mv88e6xxx/port.h
@@ -43,8 +43,8 @@
 #define MV88E6XXX_PORT_STS_FLOW_CTL		0x0010
 #define MV88E6XXX_PORT_STS_CMODE_MASK		0x000f
 #define MV88E6XXX_PORT_STS_CMODE_RGMII		0x0007
-#define MV88E6XXX_PORT_STS_CMODE_100BASE_X	0x0008
-#define MV88E6XXX_PORT_STS_CMODE_1000BASE_X	0x0009
+#define MV88E6XXX_PORT_STS_CMODE_100BASEX	0x0008
+#define MV88E6XXX_PORT_STS_CMODE_1000BASEX	0x0009
 #define MV88E6XXX_PORT_STS_CMODE_SGMII		0x000a
 #define MV88E6XXX_PORT_STS_CMODE_2500BASEX	0x000b
 #define MV88E6XXX_PORT_STS_CMODE_XAUI		0x000c
diff --git a/drivers/net/dsa/mv88e6xxx/serdes.c b/drivers/net/dsa/mv88e6xxx/serdes.c
index 1946ccb6694c..5bb3aea8a008 100644
--- a/drivers/net/dsa/mv88e6xxx/serdes.c
+++ b/drivers/net/dsa/mv88e6xxx/serdes.c
@@ -73,8 +73,8 @@ static bool mv88e6352_port_has_serdes(struct mv88e6xxx_chip *chip, int port)
 {
 	u8 cmode = chip->ports[port].cmode;
 
-	if ((cmode == MV88E6XXX_PORT_STS_CMODE_100BASE_X) ||
-	    (cmode == MV88E6XXX_PORT_STS_CMODE_1000BASE_X) ||
+	if ((cmode == MV88E6XXX_PORT_STS_CMODE_100BASEX) ||
+	    (cmode == MV88E6XXX_PORT_STS_CMODE_1000BASEX) ||
 	    (cmode == MV88E6XXX_PORT_STS_CMODE_SGMII))
 		return true;
 
@@ -295,7 +295,7 @@ int mv88e6341_serdes_get_lane(struct mv88e6xxx_chip *chip, int port, s8 *lane)
 	if (port != 5)
 		return 0;
 
-	if (cmode == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
+	if (cmode == MV88E6XXX_PORT_STS_CMODE_1000BASEX ||
 	    cmode == MV88E6XXX_PORT_STS_CMODE_SGMII ||
 	    cmode == MV88E6XXX_PORT_STS_CMODE_2500BASEX)
 		*lane = MV88E6341_PORT5_LANE;
@@ -311,13 +311,13 @@ int mv88e6390_serdes_get_lane(struct mv88e6xxx_chip *chip, int port, s8 *lane)
 
 	switch (port) {
 	case 9:
-		if (cmode == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
+		if (cmode == MV88E6XXX_PORT_STS_CMODE_1000BASEX ||
 		    cmode == MV88E6XXX_PORT_STS_CMODE_SGMII ||
 		    cmode == MV88E6XXX_PORT_STS_CMODE_2500BASEX)
 			*lane = MV88E6390_PORT9_LANE0;
 		break;
 	case 10:
-		if (cmode == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
+		if (cmode == MV88E6XXX_PORT_STS_CMODE_1000BASEX ||
 		    cmode == MV88E6XXX_PORT_STS_CMODE_SGMII ||
 		    cmode == MV88E6XXX_PORT_STS_CMODE_2500BASEX)
 			*lane = MV88E6390_PORT10_LANE0;
@@ -341,53 +341,53 @@ int mv88e6390x_serdes_get_lane(struct mv88e6xxx_chip *chip, int port, s8 *lane)
 
 	switch (port) {
 	case 2:
-		if (cmode_port9 == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
+		if (cmode_port9 == MV88E6XXX_PORT_STS_CMODE_1000BASEX ||
 		    cmode_port9 == MV88E6XXX_PORT_STS_CMODE_SGMII ||
 		    cmode_port9 == MV88E6XXX_PORT_STS_CMODE_2500BASEX)
-			if (cmode_port == MV88E6XXX_PORT_STS_CMODE_1000BASE_X)
+			if (cmode_port == MV88E6XXX_PORT_STS_CMODE_1000BASEX)
 				*lane = MV88E6390_PORT9_LANE1;
 		break;
 	case 3:
-		if (cmode_port9 == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
+		if (cmode_port9 == MV88E6XXX_PORT_STS_CMODE_1000BASEX ||
 		    cmode_port9 == MV88E6XXX_PORT_STS_CMODE_SGMII ||
 		    cmode_port9 == MV88E6XXX_PORT_STS_CMODE_2500BASEX ||
 		    cmode_port9 == MV88E6XXX_PORT_STS_CMODE_RXAUI)
-			if (cmode_port == MV88E6XXX_PORT_STS_CMODE_1000BASE_X)
+			if (cmode_port == MV88E6XXX_PORT_STS_CMODE_1000BASEX)
 				*lane = MV88E6390_PORT9_LANE2;
 		break;
 	case 4:
-		if (cmode_port9 == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
+		if (cmode_port9 == MV88E6XXX_PORT_STS_CMODE_1000BASEX ||
 		    cmode_port9 == MV88E6XXX_PORT_STS_CMODE_SGMII ||
 		    cmode_port9 == MV88E6XXX_PORT_STS_CMODE_2500BASEX ||
 		    cmode_port9 == MV88E6XXX_PORT_STS_CMODE_RXAUI)
-			if (cmode_port == MV88E6XXX_PORT_STS_CMODE_1000BASE_X)
+			if (cmode_port == MV88E6XXX_PORT_STS_CMODE_1000BASEX)
 				*lane = MV88E6390_PORT9_LANE3;
 		break;
 	case 5:
-		if (cmode_port10 == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
+		if (cmode_port10 == MV88E6XXX_PORT_STS_CMODE_1000BASEX ||
 		    cmode_port10 == MV88E6XXX_PORT_STS_CMODE_SGMII ||
 		    cmode_port10 == MV88E6XXX_PORT_STS_CMODE_2500BASEX)
-			if (cmode_port == MV88E6XXX_PORT_STS_CMODE_1000BASE_X)
+			if (cmode_port == MV88E6XXX_PORT_STS_CMODE_1000BASEX)
 				*lane = MV88E6390_PORT10_LANE1;
 		break;
 	case 6:
-		if (cmode_port10 == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
+		if (cmode_port10 == MV88E6XXX_PORT_STS_CMODE_1000BASEX ||
 		    cmode_port10 == MV88E6XXX_PORT_STS_CMODE_SGMII ||
 		    cmode_port10 == MV88E6XXX_PORT_STS_CMODE_2500BASEX ||
 		    cmode_port10 == MV88E6XXX_PORT_STS_CMODE_RXAUI)
-			if (cmode_port == MV88E6XXX_PORT_STS_CMODE_1000BASE_X)
+			if (cmode_port == MV88E6XXX_PORT_STS_CMODE_1000BASEX)
 				*lane = MV88E6390_PORT10_LANE2;
 		break;
 	case 7:
-		if (cmode_port10 == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
+		if (cmode_port10 == MV88E6XXX_PORT_STS_CMODE_1000BASEX ||
 		    cmode_port10 == MV88E6XXX_PORT_STS_CMODE_SGMII ||
 		    cmode_port10 == MV88E6XXX_PORT_STS_CMODE_2500BASEX ||
 		    cmode_port10 == MV88E6XXX_PORT_STS_CMODE_RXAUI)
-			if (cmode_port == MV88E6XXX_PORT_STS_CMODE_1000BASE_X)
+			if (cmode_port == MV88E6XXX_PORT_STS_CMODE_1000BASEX)
 				*lane = MV88E6390_PORT10_LANE3;
 		break;
 	case 9:
-		if (cmode_port9 == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
+		if (cmode_port9 == MV88E6XXX_PORT_STS_CMODE_1000BASEX ||
 		    cmode_port9 == MV88E6XXX_PORT_STS_CMODE_SGMII ||
 		    cmode_port9 == MV88E6XXX_PORT_STS_CMODE_2500BASEX ||
 		    cmode_port9 == MV88E6XXX_PORT_STS_CMODE_XAUI ||
@@ -395,7 +395,7 @@ int mv88e6390x_serdes_get_lane(struct mv88e6xxx_chip *chip, int port, s8 *lane)
 			*lane = MV88E6390_PORT9_LANE0;
 		break;
 	case 10:
-		if (cmode_port10 == MV88E6XXX_PORT_STS_CMODE_1000BASE_X ||
+		if (cmode_port10 == MV88E6XXX_PORT_STS_CMODE_1000BASEX ||
 		    cmode_port10 == MV88E6XXX_PORT_STS_CMODE_SGMII ||
 		    cmode_port10 == MV88E6XXX_PORT_STS_CMODE_2500BASEX ||
 		    cmode_port10 == MV88E6XXX_PORT_STS_CMODE_XAUI ||
@@ -476,7 +476,7 @@ int mv88e6390_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on)
 
 	switch (cmode) {
 	case MV88E6XXX_PORT_STS_CMODE_SGMII:
-	case MV88E6XXX_PORT_STS_CMODE_1000BASE_X:
+	case MV88E6XXX_PORT_STS_CMODE_1000BASEX:
 	case MV88E6XXX_PORT_STS_CMODE_2500BASEX:
 		return mv88e6390_serdes_power_sgmii(chip, lane, on);
 	case MV88E6XXX_PORT_STS_CMODE_XAUI:
@@ -535,7 +535,7 @@ static void mv88e6390_serdes_irq_link_sgmii(struct mv88e6xxx_chip *chip,
 	case MV88E6XXX_PORT_STS_CMODE_SGMII:
 		mode = PHY_INTERFACE_MODE_SGMII;
 		break;
-	case MV88E6XXX_PORT_STS_CMODE_1000BASE_X:
+	case MV88E6XXX_PORT_STS_CMODE_1000BASEX:
 		mode = PHY_INTERFACE_MODE_1000BASEX;
 		break;
 	case MV88E6XXX_PORT_STS_CMODE_2500BASEX:
@@ -578,7 +578,7 @@ int mv88e6390_serdes_irq_enable(struct mv88e6xxx_chip *chip, int port,
 
 	switch (cmode) {
 	case MV88E6XXX_PORT_STS_CMODE_SGMII:
-	case MV88E6XXX_PORT_STS_CMODE_1000BASE_X:
+	case MV88E6XXX_PORT_STS_CMODE_1000BASEX:
 	case MV88E6XXX_PORT_STS_CMODE_2500BASEX:
 		err = mv88e6390_serdes_irq_enable_sgmii(chip, lane);
 	}
@@ -594,7 +594,7 @@ int mv88e6390_serdes_irq_disable(struct mv88e6xxx_chip *chip, int port,
 
 	switch (cmode) {
 	case MV88E6XXX_PORT_STS_CMODE_SGMII:
-	case MV88E6XXX_PORT_STS_CMODE_1000BASE_X:
+	case MV88E6XXX_PORT_STS_CMODE_1000BASEX:
 	case MV88E6XXX_PORT_STS_CMODE_2500BASEX:
 		err = mv88e6390_serdes_irq_disable_sgmii(chip, lane);
 	}
@@ -629,7 +629,7 @@ static irqreturn_t mv88e6390_serdes_thread_fn(int irq, void *dev_id)
 
 	switch (cmode) {
 	case MV88E6XXX_PORT_STS_CMODE_SGMII:
-	case MV88E6XXX_PORT_STS_CMODE_1000BASE_X:
+	case MV88E6XXX_PORT_STS_CMODE_1000BASEX:
 	case MV88E6XXX_PORT_STS_CMODE_2500BASEX:
 		err = mv88e6390_serdes_irq_status_sgmii(chip, lane, &status);
 		if (err)
-- 
2.21.0

[PATCH net-next v3 6/6] net: dsa: mv88e6xxx: fully support SERDES on Topaz family

[Marek Behún]

Currently we support SERDES on the Topaz family in a limited way: no
IRQs and the cmode is not writable, thus the mode is determined by
strapping pins.

Marvell's examples though show how to make cmode writable on port 5 and
support SGMII autonegotiation. It is done by writing hidden registers,
for which we already have code.

This patch adds support for making the cmode for the SERDES port
writable on the Topaz family, and enables cmode setting and SERDES IRQs.

Tested on Turris Mox.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
---
 drivers/net/dsa/mv88e6xxx/chip.c |  6 +++
 drivers/net/dsa/mv88e6xxx/port.c | 76 +++++++++++++++++++++++++-------
 drivers/net/dsa/mv88e6xxx/port.h |  4 ++
 3 files changed, 71 insertions(+), 15 deletions(-)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 202ccce65b1c..6525075f6bd3 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -2913,6 +2913,7 @@ static const struct mv88e6xxx_ops mv88e6141_ops = {
 	.port_disable_pri_override = mv88e6xxx_port_disable_pri_override,
 	.port_link_state = mv88e6352_port_link_state,
 	.port_get_cmode = mv88e6352_port_get_cmode,
+	.port_set_cmode = mv88e6341_port_set_cmode,
 	.port_setup_message_port = mv88e6xxx_setup_message_port,
 	.stats_snapshot = mv88e6390_g1_stats_snapshot,
 	.stats_set_histogram = mv88e6095_g1_stats_set_histogram,
@@ -2929,6 +2930,8 @@ static const struct mv88e6xxx_ops mv88e6141_ops = {
 	.vtu_loadpurge = mv88e6352_g1_vtu_loadpurge,
 	.serdes_power = mv88e6390_serdes_power,
 	.serdes_get_lane = mv88e6341_serdes_get_lane,
+	.serdes_irq_setup = mv88e6390_serdes_irq_setup,
+	.serdes_irq_free = mv88e6390_serdes_irq_free,
 	.gpio_ops = &mv88e6352_gpio_ops,
 	.phylink_validate = mv88e6341_phylink_validate,
 };
@@ -3608,6 +3611,7 @@ static const struct mv88e6xxx_ops mv88e6341_ops = {
 	.port_disable_pri_override = mv88e6xxx_port_disable_pri_override,
 	.port_link_state = mv88e6352_port_link_state,
 	.port_get_cmode = mv88e6352_port_get_cmode,
+	.port_set_cmode = mv88e6341_port_set_cmode,
 	.port_setup_message_port = mv88e6xxx_setup_message_port,
 	.stats_snapshot = mv88e6390_g1_stats_snapshot,
 	.stats_set_histogram = mv88e6095_g1_stats_set_histogram,
@@ -3624,6 +3628,8 @@ static const struct mv88e6xxx_ops mv88e6341_ops = {
 	.vtu_loadpurge = mv88e6352_g1_vtu_loadpurge,
 	.serdes_power = mv88e6390_serdes_power,
 	.serdes_get_lane = mv88e6341_serdes_get_lane,
+	.serdes_irq_setup = mv88e6390_serdes_irq_setup,
+	.serdes_irq_free = mv88e6390_serdes_irq_free,
 	.gpio_ops = &mv88e6352_gpio_ops,
 	.avb_ops = &mv88e6390_avb_ops,
 	.ptp_ops = &mv88e6352_ptp_ops,
diff --git a/drivers/net/dsa/mv88e6xxx/port.c b/drivers/net/dsa/mv88e6xxx/port.c
index 7183c94a92ec..908b95434b4d 100644
--- a/drivers/net/dsa/mv88e6xxx/port.c
+++ b/drivers/net/dsa/mv88e6xxx/port.c
@@ -392,17 +392,37 @@ phy_interface_t mv88e6390x_port_max_speed_mode(int port)
 	return PHY_INTERFACE_MODE_NA;
 }
 
-int mv88e6390x_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
-			      phy_interface_t mode)
+static int mv88e6341_port_force_writable_cmode(struct mv88e6xxx_chip *chip,
+					       int port)
+{
+	int err, addr;
+	u16 reg, bits;
+
+	addr = chip->info->port_base_addr + port;
+
+	err = mv88e6xxx_port_hidden_read(chip, 0x7, addr, 0, &reg);
+	if (err)
+		return err;
+
+	bits = MV88E6341_PORT_RESERVED_1A_FORCE_CMODE |
+	       MV88E6341_PORT_RESERVED_1A_SGMII_AN;
+
+	if ((reg & bits) == bits)
+		return 0;
+
+	reg |= bits;
+	return mv88e6xxx_port_hidden_write(chip, 0x7, addr, 0, reg);
+}
+
+static int mv88e6xxx_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
+				    phy_interface_t mode, bool allow_over_2500,
+				    bool make_cmode_writable)
 {
 	s8 lane;
 	u16 cmode;
 	u16 reg;
 	int err;
 
-	if (port != 9 && port != 10)
-		return -EOPNOTSUPP;
-
 	/* Default to a slow mode, so freeing up SERDES interfaces for
 	 * other ports which might use them for SFPs.
 	 */
@@ -421,9 +441,13 @@ int mv88e6390x_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
 		break;
 	case PHY_INTERFACE_MODE_XGMII:
 	case PHY_INTERFACE_MODE_XAUI:
+		if (!allow_over_2500)
+			return -EINVAL;
 		cmode = MV88E6XXX_PORT_STS_CMODE_XAUI;
 		break;
 	case PHY_INTERFACE_MODE_RXAUI:
+		if (!allow_over_2500)
+			return -EINVAL;
 		cmode = MV88E6XXX_PORT_STS_CMODE_RXAUI;
 		break;
 	default:
@@ -457,6 +481,12 @@ int mv88e6390x_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
 		if (err)
 			return err;
 
+		if (make_cmode_writable) {
+			err = mv88e6341_port_force_writable_cmode(chip, port);
+			if (err)
+				return err;
+		}
+
 		reg &= ~MV88E6XXX_PORT_STS_CMODE_MASK;
 		reg |= cmode;
 
@@ -484,21 +514,37 @@ int mv88e6390x_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
 	return 0;
 }
 
+int mv88e6390x_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
+			      phy_interface_t mode)
+{
+	if (port != 9 && port != 10)
+		return -EOPNOTSUPP;
+
+	return mv88e6xxx_port_set_cmode(chip, port, mode, true, false);
+}
+
 int mv88e6390_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
 			     phy_interface_t mode)
 {
-	switch (mode) {
-	case PHY_INTERFACE_MODE_NA:
+	if (port != 9 && port != 10)
+		return -EOPNOTSUPP;
+
+	if (mode == PHY_INTERFACE_MODE_NA)
+		return 0;
+
+	return mv88e6xxx_port_set_cmode(chip, port, mode, false, false);
+}
+
+int mv88e6341_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
+			     phy_interface_t mode)
+{
+	if (port != 5)
+		return -EOPNOTSUPP;
+
+	if (mode == PHY_INTERFACE_MODE_NA)
 		return 0;
-	case PHY_INTERFACE_MODE_XGMII:
-	case PHY_INTERFACE_MODE_XAUI:
-	case PHY_INTERFACE_MODE_RXAUI:
-		return -EINVAL;
-	default:
-		break;
-	}
 
-	return mv88e6390x_port_set_cmode(chip, port, mode);
+	return mv88e6xxx_port_set_cmode(chip, port, mode, false, true);
 }
 
 int mv88e6185_port_get_cmode(struct mv88e6xxx_chip *chip, int port, u8 *cmode)
diff --git a/drivers/net/dsa/mv88e6xxx/port.h b/drivers/net/dsa/mv88e6xxx/port.h
index 04550cb3c3b3..4b7289a1fd8b 100644
--- a/drivers/net/dsa/mv88e6xxx/port.h
+++ b/drivers/net/dsa/mv88e6xxx/port.h
@@ -269,6 +269,8 @@
 #define MV88E6XXX_PORT_RESERVED_1A_BLOCK_SHIFT	10
 #define MV88E6XXX_PORT_RESERVED_1A_CTRL_PORT	0x04
 #define MV88E6XXX_PORT_RESERVED_1A_DATA_PORT	0x05
+#define MV88E6341_PORT_RESERVED_1A_FORCE_CMODE	0x8000
+#define MV88E6341_PORT_RESERVED_1A_SGMII_AN	0x2000
 
 int mv88e6xxx_port_read(struct mv88e6xxx_chip *chip, int port, int reg,
 			u16 *val);
@@ -334,6 +336,8 @@ int mv88e6097_port_pause_limit(struct mv88e6xxx_chip *chip, int port, u8 in,
 			       u8 out);
 int mv88e6390_port_pause_limit(struct mv88e6xxx_chip *chip, int port, u8 in,
 			       u8 out);
+int mv88e6341_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
+			     phy_interface_t mode);
 int mv88e6390_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
 			     phy_interface_t mode);
 int mv88e6390x_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
-- 
2.21.0