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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/net/phy/ncn26000.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/net/phy/ncn26000.c')
-rw-r--r--drivers/net/phy/ncn26000.c171
1 files changed, 171 insertions, 0 deletions
diff --git a/drivers/net/phy/ncn26000.c b/drivers/net/phy/ncn26000.c
new file mode 100644
index 0000000000..5680584f65
--- /dev/null
+++ b/drivers/net/phy/ncn26000.c
@@ -0,0 +1,171 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
+/*
+ * Driver for the onsemi 10BASE-T1S NCN26000 PHYs family.
+ *
+ * Copyright 2022 onsemi
+ */
+#include <linux/kernel.h>
+#include <linux/bitfield.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mii.h>
+#include <linux/phy.h>
+
+#include "mdio-open-alliance.h"
+
+#define PHY_ID_NCN26000 0x180FF5A1
+
+#define NCN26000_REG_IRQ_CTL 16
+#define NCN26000_REG_IRQ_STATUS 17
+
+// the NCN26000 maps link_ctrl to BMCR_ANENABLE
+#define NCN26000_BCMR_LINK_CTRL_BIT BMCR_ANENABLE
+
+// the NCN26000 maps link_status to BMSR_ANEGCOMPLETE
+#define NCN26000_BMSR_LINK_STATUS_BIT BMSR_ANEGCOMPLETE
+
+#define NCN26000_IRQ_LINKST_BIT BIT(0)
+#define NCN26000_IRQ_PLCAST_BIT BIT(1)
+#define NCN26000_IRQ_LJABBER_BIT BIT(2)
+#define NCN26000_IRQ_RJABBER_BIT BIT(3)
+#define NCN26000_IRQ_PLCAREC_BIT BIT(4)
+#define NCN26000_IRQ_PHYSCOL_BIT BIT(5)
+#define NCN26000_IRQ_RESET_BIT BIT(15)
+
+#define TO_TMR_DEFAULT 32
+
+static int ncn26000_config_init(struct phy_device *phydev)
+{
+ /* HW bug workaround: the default value of the PLCA TO_TIMER should be
+ * 32, where the current version of NCN26000 reports 24. This will be
+ * fixed in future PHY versions. For the time being, we force the
+ * correct default here.
+ */
+ return phy_write_mmd(phydev, MDIO_MMD_VEND2, MDIO_OATC14_PLCA_TOTMR,
+ TO_TMR_DEFAULT);
+}
+
+static int ncn26000_config_aneg(struct phy_device *phydev)
+{
+ /* Note: the NCN26000 supports only P2MP link mode. Therefore, AN is not
+ * supported. However, this function is invoked by phylib to enable the
+ * PHY, regardless of the AN support.
+ */
+ phydev->mdix_ctrl = ETH_TP_MDI_AUTO;
+ phydev->mdix = ETH_TP_MDI;
+
+ // bring up the link
+ return phy_write(phydev, MII_BMCR, NCN26000_BCMR_LINK_CTRL_BIT);
+}
+
+static int ncn26000_read_status(struct phy_device *phydev)
+{
+ /* The NCN26000 reports NCN26000_LINK_STATUS_BIT if the link status of
+ * the PHY is up. It further reports the logical AND of the link status
+ * and the PLCA status in the BMSR_LSTATUS bit.
+ */
+ int ret;
+
+ /* The link state is latched low so that momentary link
+ * drops can be detected. Do not double-read the status
+ * in polling mode to detect such short link drops except
+ * the link was already down.
+ */
+ if (!phy_polling_mode(phydev) || !phydev->link) {
+ ret = phy_read(phydev, MII_BMSR);
+ if (ret < 0)
+ return ret;
+ else if (ret & NCN26000_BMSR_LINK_STATUS_BIT)
+ goto upd_link;
+ }
+
+ ret = phy_read(phydev, MII_BMSR);
+ if (ret < 0)
+ return ret;
+
+upd_link:
+ // update link status
+ if (ret & NCN26000_BMSR_LINK_STATUS_BIT) {
+ phydev->link = 1;
+ phydev->pause = 0;
+ phydev->duplex = DUPLEX_HALF;
+ phydev->speed = SPEED_10;
+ } else {
+ phydev->link = 0;
+ phydev->duplex = DUPLEX_UNKNOWN;
+ phydev->speed = SPEED_UNKNOWN;
+ }
+
+ return 0;
+}
+
+static irqreturn_t ncn26000_handle_interrupt(struct phy_device *phydev)
+{
+ int ret;
+
+ // read and aknowledge the IRQ status register
+ ret = phy_read(phydev, NCN26000_REG_IRQ_STATUS);
+
+ // check only link status changes
+ if (ret < 0 || (ret & NCN26000_REG_IRQ_STATUS) == 0)
+ return IRQ_NONE;
+
+ phy_trigger_machine(phydev);
+ return IRQ_HANDLED;
+}
+
+static int ncn26000_config_intr(struct phy_device *phydev)
+{
+ int ret;
+ u16 irqe;
+
+ if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
+ // acknowledge IRQs
+ ret = phy_read(phydev, NCN26000_REG_IRQ_STATUS);
+ if (ret < 0)
+ return ret;
+
+ // get link status notifications
+ irqe = NCN26000_IRQ_LINKST_BIT;
+ } else {
+ // disable all IRQs
+ irqe = 0;
+ }
+
+ ret = phy_write(phydev, NCN26000_REG_IRQ_CTL, irqe);
+ if (ret != 0)
+ return ret;
+
+ return 0;
+}
+
+static struct phy_driver ncn26000_driver[] = {
+ {
+ PHY_ID_MATCH_MODEL(PHY_ID_NCN26000),
+ .name = "NCN26000",
+ .features = PHY_BASIC_T1S_P2MP_FEATURES,
+ .config_init = ncn26000_config_init,
+ .config_intr = ncn26000_config_intr,
+ .config_aneg = ncn26000_config_aneg,
+ .read_status = ncn26000_read_status,
+ .handle_interrupt = ncn26000_handle_interrupt,
+ .get_plca_cfg = genphy_c45_plca_get_cfg,
+ .set_plca_cfg = genphy_c45_plca_set_cfg,
+ .get_plca_status = genphy_c45_plca_get_status,
+ .soft_reset = genphy_soft_reset,
+ },
+};
+
+module_phy_driver(ncn26000_driver);
+
+static struct mdio_device_id __maybe_unused ncn26000_tbl[] = {
+ { PHY_ID_MATCH_MODEL(PHY_ID_NCN26000) },
+ { }
+};
+
+MODULE_DEVICE_TABLE(mdio, ncn26000_tbl);
+
+MODULE_AUTHOR("Piergiorgio Beruto");
+MODULE_DESCRIPTION("onsemi 10BASE-T1S PHY driver");
+MODULE_LICENSE("Dual BSD/GPL");