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-rw-r--r--target/linux/generic/pending-5.4/752-net-phy-add-Broadcom-BCM84881-PHY-driver.patch333
1 files changed, 333 insertions, 0 deletions
diff --git a/target/linux/generic/pending-5.4/752-net-phy-add-Broadcom-BCM84881-PHY-driver.patch b/target/linux/generic/pending-5.4/752-net-phy-add-Broadcom-BCM84881-PHY-driver.patch
new file mode 100644
index 0000000000..a69cf397aa
--- /dev/null
+++ b/target/linux/generic/pending-5.4/752-net-phy-add-Broadcom-BCM84881-PHY-driver.patch
@@ -0,0 +1,333 @@
+From 0f669e10ede7f06bb998373de6a9d169f47fcc66 Mon Sep 17 00:00:00 2001
+From: Russell King <rmk+kernel@armlinux.org.uk>
+Date: Tue, 5 Nov 2019 11:54:30 +0000
+Subject: [PATCH 655/660] net: phy: add Broadcom BCM84881 PHY driver
+
+Add a rudimentary Clause 45 driver for the BCM84881 PHY, found on
+Methode DM7052 SFPs.
+
+Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
+---
+ drivers/net/phy/Kconfig | 5 +
+ drivers/net/phy/Makefile | 1 +
+ drivers/net/phy/bcm84881.c | 290 +++++++++++++++++++++++++++++++++++++
+ 3 files changed, 296 insertions(+)
+ create mode 100644 drivers/net/phy/bcm84881.c
+
+--- a/drivers/net/phy/Kconfig
++++ b/drivers/net/phy/Kconfig
+@@ -280,6 +280,11 @@ config BROADCOM_PHY
+ Currently supports the BCM5411, BCM5421, BCM5461, BCM54616S, BCM5464,
+ BCM5481, BCM54810 and BCM5482 PHYs.
+
++config BCM84881_PHY
++ tristate "Broadcom BCM84881 PHY"
++ ---help---
++ Support the Broadcom BCM84881 PHY.
++
+ config CICADA_PHY
+ tristate "Cicada PHYs"
+ ---help---
+--- a/drivers/net/phy/Makefile
++++ b/drivers/net/phy/Makefile
+@@ -54,6 +54,7 @@ obj-$(CONFIG_BCM87XX_PHY) += bcm87xx.o
+ obj-$(CONFIG_BCM_CYGNUS_PHY) += bcm-cygnus.o
+ obj-$(CONFIG_BCM_NET_PHYLIB) += bcm-phy-lib.o
+ obj-$(CONFIG_BROADCOM_PHY) += broadcom.o
++obj-$(CONFIG_BCM84881_PHY) += bcm84881.o
+ obj-$(CONFIG_CICADA_PHY) += cicada.o
+ obj-$(CONFIG_CORTINA_PHY) += cortina.o
+ obj-$(CONFIG_DAVICOM_PHY) += davicom.o
+--- /dev/null
++++ b/drivers/net/phy/bcm84881.c
+@@ -0,0 +1,290 @@
++// SPDX-License-Identifier: GPL-2.0
++// Broadcom BCM84881 NBASE-T PHY driver, as found on a SFP+ module.
++// Copyright (C) 2019 Russell King, Deep Blue Solutions Ltd.
++//
++// Like the Marvell 88x3310, the Broadcom 84881 changes its host-side
++// interface according to the operating speed between 10GBASE-R,
++// 2500BASE-X and SGMII (but unlike the 88x3310, without the control
++// word).
++//
++// This driver only supports those aspects of the PHY that I'm able to
++// observe and test with the SFP+ module, which is an incomplete subset
++// of what this PHY is able to support. For example, I only assume it
++// supports a single lane Serdes connection, but it may be that the PHY
++// is able to support more than that.
++#include <linux/delay.h>
++#include <linux/module.h>
++#include <linux/phy.h>
++
++enum {
++ MDIO_AN_C22 = 0xffe0,
++};
++
++static int bcm84881_wait_init(struct phy_device *phydev)
++{
++ unsigned int tries = 20;
++ int ret, val;
++
++ do {
++ val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1);
++ if (val < 0) {
++ ret = val;
++ break;
++ }
++ if (!(val & MDIO_CTRL1_RESET)) {
++ ret = 0;
++ break;
++ }
++ if (!--tries) {
++ ret = -ETIMEDOUT;
++ break;
++ }
++ msleep(100);
++ } while (1);
++
++ if (ret)
++ phydev_err(phydev, "%s failed: %d\n", __func__, ret);
++
++ return ret;
++}
++
++static int bcm84881_config_init(struct phy_device *phydev)
++{
++ switch (phydev->interface) {
++ case PHY_INTERFACE_MODE_SGMII:
++ case PHY_INTERFACE_MODE_2500BASEX:
++ case PHY_INTERFACE_MODE_10GKR:
++ break;
++ default:
++ return -ENODEV;
++ }
++ return 0;
++}
++
++static int bcm84881_probe(struct phy_device *phydev)
++{
++ /* This driver requires PMAPMD and AN blocks */
++ const u32 mmd_mask = MDIO_DEVS_PMAPMD | MDIO_DEVS_AN;
++
++ if (!phydev->is_c45 ||
++ (phydev->c45_ids.devices_in_package & mmd_mask) != mmd_mask)
++ return -ENODEV;
++
++ return 0;
++}
++
++static int genphy_c45_an_config_aneg(struct phy_device *phydev)
++{
++ bool changed = false;
++ u32 advertising;
++ int ret;
++
++ phydev->advertising &= phydev->supported;
++ advertising = phydev->advertising;
++
++ ret = phy_modify_mmd_changed(phydev, MDIO_MMD_AN, MDIO_AN_ADVERTISE,
++ ADVERTISE_ALL | ADVERTISE_100BASE4 |
++ ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM,
++ ethtool_adv_to_mii_adv_t(advertising));
++ if (ret < 0)
++ return ret;
++ if (ret > 0)
++ changed = true;
++
++ ret = phy_modify_mmd_changed(phydev, MDIO_MMD_AN, MDIO_AN_10GBT_CTRL,
++ MDIO_AN_10GBT_CTRL_ADV10G,
++ advertising & ADVERTISED_10000baseT_Full ?
++ MDIO_AN_10GBT_CTRL_ADV10G : 0);
++ if (ret < 0)
++ return ret;
++ if (ret > 0)
++ changed = true;
++
++ return genphy_c45_check_and_restart_aneg(phydev, changed);
++}
++
++static int bcm84881_config_aneg(struct phy_device *phydev)
++{
++ bool changed = false;
++ u32 adv;
++ int ret;
++
++ /* Wait for the PHY to finish initialising, otherwise our
++ * advertisement may be overwritten.
++ */
++ ret = bcm84881_wait_init(phydev);
++ if (ret)
++ return ret;
++
++ /* We don't support manual MDI control */
++ phydev->mdix_ctrl = ETH_TP_MDI_AUTO;
++
++ /* disabled autoneg doesn't seem to work with this PHY */
++ if (phydev->autoneg == AUTONEG_DISABLE)
++ return -EINVAL;
++
++ ret = genphy_c45_an_config_aneg(phydev);
++ if (ret < 0)
++ return ret;
++ if (ret > 0)
++ changed = true;
++
++ adv = ethtool_adv_to_mii_ctrl1000_t(phydev->advertising);
++ ret = phy_modify_mmd_changed(phydev, MDIO_MMD_AN,
++ MDIO_AN_C22 + MII_CTRL1000,
++ ADVERTISE_1000FULL | ADVERTISE_1000HALF,
++ adv);
++ if (ret < 0)
++ return ret;
++ if (ret > 0)
++ changed = true;
++
++ return genphy_c45_check_and_restart_aneg(phydev, changed);
++}
++
++static int bcm84881_aneg_done(struct phy_device *phydev)
++{
++ int bmsr, val;
++
++ val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
++ if (val < 0)
++ return val;
++
++ bmsr = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_C22 + MII_BMSR);
++ if (bmsr < 0)
++ return val;
++
++ return !!(val & MDIO_AN_STAT1_COMPLETE) &&
++ !!(bmsr & BMSR_ANEGCOMPLETE);
++}
++
++static int bcm84881_read_status(struct phy_device *phydev)
++{
++ bool autoneg_complete;
++ unsigned int mode;
++ int bmsr, val;
++
++ val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1);
++ if (val < 0)
++ return val;
++
++ if (val & MDIO_AN_CTRL1_RESTART) {
++ phydev->link = 0;
++ return 0;
++ }
++
++ val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
++ if (val < 0)
++ return val;
++
++ bmsr = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_C22 + MII_BMSR);
++ if (bmsr < 0)
++ return val;
++
++ autoneg_complete = !!(val & MDIO_AN_STAT1_COMPLETE) &&
++ !!(bmsr & BMSR_ANEGCOMPLETE);
++ phydev->link = !!(val & MDIO_STAT1_LSTATUS) &&
++ !!(bmsr & BMSR_LSTATUS);
++ if (phydev->autoneg == AUTONEG_ENABLE && !autoneg_complete)
++ phydev->link = false;
++
++ if (!phydev->link)
++ return 0;
++
++ phydev->lp_advertising = 0;
++ phydev->speed = SPEED_UNKNOWN;
++ phydev->duplex = DUPLEX_UNKNOWN;
++ phydev->pause = 0;
++ phydev->asym_pause = 0;
++ phydev->mdix = 0;
++
++ if (autoneg_complete) {
++ val = genphy_c45_read_lpa(phydev);
++ if (val < 0)
++ return val;
++
++ val = phy_read_mmd(phydev, MDIO_MMD_AN,
++ MDIO_AN_C22 + MII_STAT1000);
++ if (val < 0)
++ return val;
++
++ phydev->lp_advertising |= mii_stat1000_to_ethtool_lpa_t(val);
++
++ if (phydev->autoneg == AUTONEG_ENABLE)
++ phy_resolve_aneg_linkmode(phydev);
++ }
++
++ if (phydev->autoneg == AUTONEG_DISABLE) {
++ /* disabled autoneg doesn't seem to work, so force the link
++ * down.
++ */
++ phydev->link = 0;
++ return 0;
++ }
++
++ /* Set the host link mode - we set the phy interface mode and
++ * the speed according to this register so that downshift works.
++ * We leave the duplex setting as per the resolution from the
++ * above.
++ */
++ val = phy_read_mmd(phydev, MDIO_MMD_VEND1, 0x4011);
++ mode = (val & 0x1e) >> 1;
++ if (mode == 1 || mode == 2)
++ phydev->interface = PHY_INTERFACE_MODE_SGMII;
++ else if (mode == 3)
++ phydev->interface = PHY_INTERFACE_MODE_10GKR;
++ else if (mode == 4)
++ phydev->interface = PHY_INTERFACE_MODE_2500BASEX;
++ switch (mode & 7) {
++ case 1:
++ phydev->speed = SPEED_100;
++ break;
++ case 2:
++ phydev->speed = SPEED_1000;
++ break;
++ case 3:
++ phydev->speed = SPEED_10000;
++ break;
++ case 4:
++ phydev->speed = SPEED_2500;
++ break;
++ case 5:
++ phydev->speed = SPEED_5000;
++ break;
++ }
++
++ return genphy_c45_read_mdix(phydev);
++}
++
++static struct phy_driver bcm84881_drivers[] = {
++ {
++ .phy_id = 0xae025150,
++ .phy_id_mask = 0xfffffff0,
++ .name = "Broadcom BCM84881",
++ .features = SUPPORTED_100baseT_Full |
++ SUPPORTED_100baseT_Half |
++ SUPPORTED_1000baseT_Full |
++ SUPPORTED_Autoneg |
++ SUPPORTED_TP |
++ SUPPORTED_FIBRE |
++ SUPPORTED_10000baseT_Full |
++ SUPPORTED_Backplane,
++ .config_init = bcm84881_config_init,
++ .probe = bcm84881_probe,
++ .config_aneg = bcm84881_config_aneg,
++ .aneg_done = bcm84881_aneg_done,
++ .read_status = bcm84881_read_status,
++ },
++};
++
++module_phy_driver(bcm84881_drivers);
++
++/* FIXME: module auto-loading for Clause 45 PHYs seems non-functional */
++static struct mdio_device_id __maybe_unused bcm84881_tbl[] = {
++ { 0xae025150, 0xfffffff0 },
++ { },
++};
++MODULE_AUTHOR("Russell King");
++MODULE_DESCRIPTION("Broadcom BCM84881 PHY driver");
++MODULE_DEVICE_TABLE(mdio, bcm84881_tbl);
++MODULE_LICENSE("GPL");
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