diff mbox series

[net-next,v8] net: dsa: mv88e6xxx: implement USXGMII mode for mv88e6393x

Message ID 20230605174442.12493-1-msmulski2@gmail.com (mailing list archive)
State Accepted
Commit 4a56212774acf71a7356026fb11b78228a7ad24d
Delegated to: Netdev Maintainers
Headers show
Series [net-next,v8] net: dsa: mv88e6xxx: implement USXGMII mode for mv88e6393x | expand

Checks

Context Check Description
netdev/series_format success Single patches do not need cover letters
netdev/tree_selection success Clearly marked for net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 8 this patch: 8
netdev/cc_maintainers success CCed 9 of 9 maintainers
netdev/build_clang success Errors and warnings before: 8 this patch: 8
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 8 this patch: 8
netdev/checkpatch warning WARNING: line length of 81 exceeds 80 columns WARNING: line length of 83 exceeds 80 columns WARNING: line length of 85 exceeds 80 columns WARNING: line length of 86 exceeds 80 columns WARNING: line length of 91 exceeds 80 columns WARNING: line length of 93 exceeds 80 columns
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Michal Smulski June 5, 2023, 5:44 p.m. UTC 
From: Michal Smulski <michal.smulski@ooma.com>

Enable USXGMII mode for mv88e6393x chips. Tested on Marvell 88E6191X.

Signed-off-by: Michal Smulski <michal.smulski@ooma.com>
---
Changelist (v7 -> v8):
1. added comments related to the link bit of lp_status register.

 drivers/net/dsa/mv88e6xxx/chip.c   |  3 +-
 drivers/net/dsa/mv88e6xxx/port.c   |  3 ++
 drivers/net/dsa/mv88e6xxx/serdes.c | 47 ++++++++++++++++++++++++++++--
 drivers/net/dsa/mv88e6xxx/serdes.h |  4 +++
 4 files changed, 53 insertions(+), 4 deletions(-)

Comments

patchwork-bot+netdevbpf@kernel.org June 8, 2023, 4:40 a.m. UTC | #1 
Hello:

This patch was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Mon,  5 Jun 2023 10:44:42 -0700 you wrote:
> From: Michal Smulski <michal.smulski@ooma.com>
> 
> Enable USXGMII mode for mv88e6393x chips. Tested on Marvell 88E6191X.
> 
> Signed-off-by: Michal Smulski <michal.smulski@ooma.com>
> ---
> Changelist (v7 -> v8):
> 1. added comments related to the link bit of lp_status register.
> 
> [...]

Here is the summary with links:
  - [net-next,v8] net: dsa: mv88e6xxx: implement USXGMII mode for mv88e6393x
    https://git.kernel.org/netdev/net-next/c/4a56212774ac

You are awesome, thank you!
diff mbox series

Patch

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 2af0c1145d36..8b51756bd805 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -812,11 +812,10 @@  static void mv88e6393x_phylink_get_caps(struct mv88e6xxx_chip *chip, int port,
 			if (!is_6361) {
 				__set_bit(PHY_INTERFACE_MODE_5GBASER, supported);
 				__set_bit(PHY_INTERFACE_MODE_10GBASER, supported);
+				__set_bit(PHY_INTERFACE_MODE_USXGMII, supported);
 				config->mac_capabilities |= MAC_5000FD |
 					MAC_10000FD;
 			}
-			/* FIXME: USXGMII is not supported yet */
-			/* __set_bit(PHY_INTERFACE_MODE_USXGMII, supported); */
 		}
 	}
 
diff --git a/drivers/net/dsa/mv88e6xxx/port.c b/drivers/net/dsa/mv88e6xxx/port.c
index e9b4a6ea4d09..dd66ec902d4c 100644
--- a/drivers/net/dsa/mv88e6xxx/port.c
+++ b/drivers/net/dsa/mv88e6xxx/port.c
@@ -566,6 +566,9 @@  static int mv88e6xxx_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
 	case PHY_INTERFACE_MODE_10GBASER:
 		cmode = MV88E6393X_PORT_STS_CMODE_10GBASER;
 		break;
+	case PHY_INTERFACE_MODE_USXGMII:
+		cmode = MV88E6393X_PORT_STS_CMODE_USXGMII;
+		break;
 	default:
 		cmode = 0;
 	}
diff --git a/drivers/net/dsa/mv88e6xxx/serdes.c b/drivers/net/dsa/mv88e6xxx/serdes.c
index 72faec8f44dc..80167d53212f 100644
--- a/drivers/net/dsa/mv88e6xxx/serdes.c
+++ b/drivers/net/dsa/mv88e6xxx/serdes.c
@@ -683,7 +683,8 @@  int mv88e6393x_serdes_get_lane(struct mv88e6xxx_chip *chip, int port)
 	    cmode == MV88E6XXX_PORT_STS_CMODE_SGMII ||
 	    cmode == MV88E6XXX_PORT_STS_CMODE_2500BASEX ||
 	    cmode == MV88E6393X_PORT_STS_CMODE_5GBASER ||
-	    cmode == MV88E6393X_PORT_STS_CMODE_10GBASER)
+	    cmode == MV88E6393X_PORT_STS_CMODE_10GBASER ||
+	    cmode == MV88E6393X_PORT_STS_CMODE_USXGMII)
 		lane = port;
 
 	return lane;
@@ -984,7 +985,42 @@  static int mv88e6393x_serdes_pcs_get_state_10g(struct mv88e6xxx_chip *chip,
 			state->speed = SPEED_10000;
 		state->duplex = DUPLEX_FULL;
 	}
+	return 0;
+}
+
+/* USXGMII registers for Marvell switch 88e639x are undocumented and this function is based
+ * on some educated guesses. It appears that there are no status bits related to
+ * autonegotiation complete or flow control.
+ */
+static int mv88e639x_serdes_pcs_get_state_usxgmii(struct mv88e6xxx_chip *chip,
+						  int port, int lane,
+						  struct phylink_link_state *state)
+{
+	u16 status, lp_status;
+	int err;
 
+	err = mv88e6390_serdes_read(chip, lane, MDIO_MMD_PHYXS,
+				    MV88E6390_USXGMII_PHY_STATUS, &status);
+	if (err) {
+		dev_err(chip->dev, "can't read Serdes USXGMII PHY status: %d\n", err);
+		return err;
+	}
+	dev_dbg(chip->dev, "USXGMII PHY status: 0x%x\n", status);
+
+	state->link = !!(status & MDIO_USXGMII_LINK);
+	state->an_complete = state->link;
+
+	if (state->link) {
+		err = mv88e6390_serdes_read(chip, lane, MDIO_MMD_PHYXS,
+					    MV88E6390_USXGMII_LP_STATUS, &lp_status);
+		if (err) {
+			dev_err(chip->dev, "can't read Serdes USXGMII LP status: %d\n", err);
+			return err;
+		}
+		dev_dbg(chip->dev, "USXGMII LP status: 0x%x\n", lp_status);
+		/* lp_status appears to include the "link" bit as per USXGMII spec. */
+		phylink_decode_usxgmii_word(state, lp_status);
+	}
 	return 0;
 }
 
@@ -1020,6 +1056,9 @@  int mv88e6393x_serdes_pcs_get_state(struct mv88e6xxx_chip *chip, int port,
 	case PHY_INTERFACE_MODE_10GBASER:
 		return mv88e6393x_serdes_pcs_get_state_10g(chip, port, lane,
 							   state);
+	case PHY_INTERFACE_MODE_USXGMII:
+		return mv88e639x_serdes_pcs_get_state_usxgmii(chip, port, lane,
+							   state);
 
 	default:
 		return -EOPNOTSUPP;
@@ -1173,6 +1212,7 @@  int mv88e6393x_serdes_irq_enable(struct mv88e6xxx_chip *chip, int port,
 		return mv88e6390_serdes_irq_enable_sgmii(chip, lane, enable);
 	case MV88E6393X_PORT_STS_CMODE_5GBASER:
 	case MV88E6393X_PORT_STS_CMODE_10GBASER:
+	case MV88E6393X_PORT_STS_CMODE_USXGMII:
 		return mv88e6393x_serdes_irq_enable_10g(chip, lane, enable);
 	}
 
@@ -1213,6 +1253,7 @@  irqreturn_t mv88e6393x_serdes_irq_status(struct mv88e6xxx_chip *chip, int port,
 		break;
 	case MV88E6393X_PORT_STS_CMODE_5GBASER:
 	case MV88E6393X_PORT_STS_CMODE_10GBASER:
+	case MV88E6393X_PORT_STS_CMODE_USXGMII:
 		err = mv88e6393x_serdes_irq_status_10g(chip, lane, &status);
 		if (err)
 			return err;
@@ -1477,7 +1518,8 @@  static int mv88e6393x_serdes_erratum_5_2(struct mv88e6xxx_chip *chip, int lane,
 	 * to SERDES operating in 10G mode. These registers only apply to 10G
 	 * operation and have no effect on other speeds.
 	 */
-	if (cmode != MV88E6393X_PORT_STS_CMODE_10GBASER)
+	if (cmode != MV88E6393X_PORT_STS_CMODE_10GBASER &&
+	    cmode != MV88E6393X_PORT_STS_CMODE_USXGMII)
 		return 0;
 
 	for (i = 0; i < ARRAY_SIZE(fixes); ++i) {
@@ -1582,6 +1624,7 @@  int mv88e6393x_serdes_power(struct mv88e6xxx_chip *chip, int port, int lane,
 		break;
 	case MV88E6393X_PORT_STS_CMODE_5GBASER:
 	case MV88E6393X_PORT_STS_CMODE_10GBASER:
+	case MV88E6393X_PORT_STS_CMODE_USXGMII:
 		err = mv88e6390_serdes_power_10g(chip, lane, on);
 		break;
 	default:
diff --git a/drivers/net/dsa/mv88e6xxx/serdes.h b/drivers/net/dsa/mv88e6xxx/serdes.h
index 29bb4e91e2f6..e245687ddb1d 100644
--- a/drivers/net/dsa/mv88e6xxx/serdes.h
+++ b/drivers/net/dsa/mv88e6xxx/serdes.h
@@ -48,6 +48,10 @@ 
 #define MV88E6393X_10G_INT_LINK_CHANGE	BIT(2)
 #define MV88E6393X_10G_INT_STATUS	0x9001
 
+/* USXGMII */
+#define MV88E6390_USXGMII_LP_STATUS       0xf0a2
+#define MV88E6390_USXGMII_PHY_STATUS      0xf0a6
+
 /* 1000BASE-X and SGMII */
 #define MV88E6390_SGMII_BMCR		(0x2000 + MII_BMCR)
 #define MV88E6390_SGMII_BMSR		(0x2000 + MII_BMSR)