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kernel: backport Motorcomm YT6801 PCIe ethernet driver support

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Motorcomm YT6801 is a PCIe ethernet controller based on DWMAC4 IP. It
integrates an GbE phy, supporting WOL, VLAN tagging and various types
of offloading. It ships an on-chip eFuse for storing various vendor
configuration, including MAC address.

The PM and plat_data functions were slightly modified to build with
current kernel.

Signed-off-by: Tianling Shen <cnsztl@immortalwrt.org>
Link: https://github.com/openwrt/openwrt/pull/22923
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
This commit is contained in:
Tianling Shen
2026-03-26 14:05:35 +08:00
committed by Hauke Mehrtens
parent 3956287514
commit 5917c67af9
9 changed files with 1031 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
package/kernel/linux/modules/netdevices.mk
+16
View File
@@ -689,6 +689,22 @@ endef
$(eval $(call KernelPackage,phy-motorcomm))
define KernelPackage/dwmac-motorcomm
SUBMENU:=$(NETWORK_DEVICES_MENU)
TITLE:=Motorcomm PCI DWMAC support
DEPENDS:=@PCI_SUPPORT +kmod-phy-motorcomm +kmod-stmmac-core
KCONFIG:=CONFIG_DWMAC_MOTORCOMM
FILES:=$(LINUX_DIR)/drivers/net/ethernet/stmicro/stmmac/dwmac-motorcomm.ko
AUTOLOAD:=$(call AutoProbe,dwmac-motorcomm,1)
endef
define KernelPackage/dwmac-motorcomm/description
Supports the Motorcomm DWMAC-based PCI Ethernet controllers.
endef
$(eval $(call KernelPackage,dwmac-motorcomm))
define KernelPackage/dsa
SUBMENU:=$(NETWORK_DEVICES_MENU)
TITLE:=Distributed Switch Architecture support
target/linux/generic/backport-6.12/705-01-v7.0-net-phy-motorcomm-Support-YT8531S-PHY-in-YT6801-Ethernet.patch
+36
View File
@@ -0,0 +1,36 @@
From 365e649361cde842c720ffa4b6a22fe092287990 Mon Sep 17 00:00:00 2001
From: Yao Zi <me@ziyao.cc>
Date: Fri, 9 Jan 2026 09:34:44 +0000
Subject: [PATCH] net: phy: motorcomm: Support YT8531S PHY in YT6801 Ethernet
controller
YT6801's internal PHY is confirmed as a GMII-capable variant of YT8531S
by a previous series[1] and reading PHY ID. Add support for
PHY_INTERFACE_MODE_GMII for YT8531S to allow the Ethernet driver to
reuse the PHY code for its internal PHY.
Link: https://lore.kernel.org/all/a48d76ac-db08-46d5-9528-f046a7b541dc@motor-comm.com/ # [1]
Co-developed-by: Frank Sae <Frank.Sae@motor-comm.com>
Signed-off-by: Frank Sae <Frank.Sae@motor-comm.com>
Signed-off-by: Yao Zi <me@ziyao.cc>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/20260109093445.46791-3-me@ziyao.cc
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
drivers/net/phy/motorcomm.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/net/phy/motorcomm.c
+++ b/drivers/net/phy/motorcomm.c
@@ -896,6 +896,10 @@ static int ytphy_rgmii_clk_delay_config(
val |= FIELD_PREP(YT8521_RC1R_RX_DELAY_MASK, rx_reg) |
FIELD_PREP(YT8521_RC1R_GE_TX_DELAY_MASK, tx_reg);
break;
+ case PHY_INTERFACE_MODE_GMII:
+ if (phydev->drv->phy_id != PHY_ID_YT8531S)
+ return -EOPNOTSUPP;
+ return 0;
default: /* do not support other modes */
return -EOPNOTSUPP;
}
target/linux/generic/backport-6.12/705-02-v7.0-net-stmmac-Add-glue-driver-for-Motorcomm-YT6801-ethernet.patch
+472
View File
@@ -0,0 +1,472 @@
From 02ff155ea2812ea25a086665522fd4fa196ef0ce Mon Sep 17 00:00:00 2001
From: Yao Zi <me@ziyao.cc>
Date: Fri, 9 Jan 2026 09:34:45 +0000
Subject: [PATCH] net: stmmac: Add glue driver for Motorcomm YT6801 ethernet
controller
Motorcomm YT6801 is a PCIe ethernet controller based on DWMAC4 IP. It
integrates an GbE phy, supporting WOL, VLAN tagging and various types
of offloading. It ships an on-chip eFuse for storing various vendor
configuration, including MAC address.
This patch adds basic glue code for the controller, allowing it to be
set up and transmit data at a reasonable speed. Features like WOL could
be implemented in the future.
Signed-off-by: Yao Zi <me@ziyao.cc>
Tested-by: Mingcong Bai <jeffbai@aosc.io>
Tested-by: Runhua He <hua@aosc.io>
Tested-by: Xi Ruoyao <xry111@xry111.site>
Reviewed-by: Sai Krishna <saikrishnag@marvell.com>
Link: https://patch.msgid.link/20260109093445.46791-4-me@ziyao.cc
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
drivers/net/ethernet/stmicro/stmmac/Kconfig | 9 +
drivers/net/ethernet/stmicro/stmmac/Makefile | 1 +
.../ethernet/stmicro/stmmac/dwmac-motorcomm.c | 384 ++++++++++++++++++
3 files changed, 394 insertions(+)
create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-motorcomm.c
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -298,6 +298,14 @@ config DWMAC_LOONGSON
This selects the LOONGSON PCI bus support for the stmmac driver,
Support for ethernet controller on Loongson-2K1000 SoC and LS7A1000 bridge.
+config DWMAC_MOTORCOMM
+ tristate "Motorcomm PCI DWMAC support"
+ depends on PCI
+ select MOTORCOMM_PHY
+ help
+ This enables glue driver for Motorcomm DWMAC-based PCI Ethernet
+ controllers. Currently only YT6801 is supported.
+
config STMMAC_PCI
tristate "STMMAC PCI bus support"
depends on STMMAC_ETH && PCI
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -41,4 +41,5 @@ dwmac-altr-socfpga-objs := dwmac-socfpga
obj-$(CONFIG_STMMAC_PCI) += stmmac-pci.o
obj-$(CONFIG_DWMAC_INTEL) += dwmac-intel.o
obj-$(CONFIG_DWMAC_LOONGSON) += dwmac-loongson.o
+obj-$(CONFIG_DWMAC_MOTORCOMM) += dwmac-motorcomm.o
stmmac-pci-objs:= stmmac_pci.o
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-motorcomm.c
@@ -0,0 +1,415 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * DWMAC glue driver for Motorcomm PCI Ethernet controllers
+ *
+ * Copyright (c) 2025-2026 Yao Zi <me@ziyao.cc>
+ */
+
+#include <linux/bits.h>
+#include <linux/dev_printk.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/stmmac.h>
+
+#include "dwmac4.h"
+#include "stmmac.h"
+
+#define DRIVER_NAME "dwmac-motorcomm"
+
+#define PCI_VENDOR_ID_MOTORCOMM 0x1f0a
+
+/* Register definition */
+#define EPHY_CTRL 0x1004
+/* Clearing this bit asserts resets for internal MDIO bus and PHY */
+#define EPHY_MDIO_PHY_RESET BIT(0)
+#define OOB_WOL_CTRL 0x1010
+#define OOB_WOL_CTRL_DIS BIT(0)
+#define MGMT_INT_CTRL0 0x1100
+#define INT_MODERATION 0x1108
+#define INT_MODERATION_RX GENMASK(11, 0)
+#define INT_MODERATION_TX GENMASK(27, 16)
+#define EFUSE_OP_CTRL_0 0x1500
+#define EFUSE_OP_MODE GENMASK(1, 0)
+#define EFUSE_OP_ROW_READ 0x1
+#define EFUSE_OP_START BIT(2)
+#define EFUSE_OP_ADDR GENMASK(15, 8)
+#define EFUSE_OP_CTRL_1 0x1504
+#define EFUSE_OP_DONE BIT(1)
+#define EFUSE_OP_RD_DATA GENMASK(31, 24)
+#define SYS_RESET 0x152c
+#define SYS_RESET_RESET BIT(31)
+#define GMAC_OFFSET 0x2000
+
+/* Constants */
+#define EFUSE_READ_TIMEOUT_US 20000
+#define EFUSE_PATCH_REGION_OFFSET 18
+#define EFUSE_PATCH_MAX_NUM 39
+#define EFUSE_ADDR_MACA0LR 0x1520
+#define EFUSE_ADDR_MACA0HR 0x1524
+
+struct motorcomm_efuse_patch {
+ __le16 addr;
+ __le32 data;
+} __packed;
+
+struct dwmac_motorcomm_priv {
+ void __iomem *base;
+};
+
+static int motorcomm_efuse_read_byte(struct dwmac_motorcomm_priv *priv,
+ u8 offset, u8 *byte)
+{
+ u32 reg;
+ int ret;
+
+ writel(FIELD_PREP(EFUSE_OP_MODE, EFUSE_OP_ROW_READ) |
+ FIELD_PREP(EFUSE_OP_ADDR, offset) |
+ EFUSE_OP_START, priv->base + EFUSE_OP_CTRL_0);
+
+ ret = readl_poll_timeout(priv->base + EFUSE_OP_CTRL_1,
+ reg, reg & EFUSE_OP_DONE, 2000,
+ EFUSE_READ_TIMEOUT_US);
+
+ *byte = FIELD_GET(EFUSE_OP_RD_DATA, reg);
+
+ return ret;
+}
+
+static int motorcomm_efuse_read_patch(struct dwmac_motorcomm_priv *priv,
+ u8 index,
+ struct motorcomm_efuse_patch *patch)
+{
+ u8 *p = (u8 *)patch, offset;
+ int i, ret;
+
+ for (i = 0; i < sizeof(*patch); i++) {
+ offset = EFUSE_PATCH_REGION_OFFSET + sizeof(*patch) * index + i;
+
+ ret = motorcomm_efuse_read_byte(priv, offset, &p[i]);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int motorcomm_efuse_get_patch_value(struct dwmac_motorcomm_priv *priv,
+ u16 addr, u32 *value)
+{
+ struct motorcomm_efuse_patch patch;
+ int i, ret;
+
+ for (i = 0; i < EFUSE_PATCH_MAX_NUM; i++) {
+ ret = motorcomm_efuse_read_patch(priv, i, &patch);
+ if (ret)
+ return ret;
+
+ if (patch.addr == 0) {
+ return -ENOENT;
+ } else if (le16_to_cpu(patch.addr) == addr) {
+ *value = le32_to_cpu(patch.data);
+ return 0;
+ }
+ }
+
+ return -ENOENT;
+}
+
+static int motorcomm_efuse_read_mac(struct device *dev,
+ struct dwmac_motorcomm_priv *priv, u8 *mac)
+{
+ u32 maca0lr, maca0hr;
+ int ret;
+
+ ret = motorcomm_efuse_get_patch_value(priv, EFUSE_ADDR_MACA0LR,
+ &maca0lr);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "failed to read maca0lr from eFuse\n");
+
+ ret = motorcomm_efuse_get_patch_value(priv, EFUSE_ADDR_MACA0HR,
+ &maca0hr);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "failed to read maca0hr from eFuse\n");
+
+ mac[0] = FIELD_GET(GENMASK(15, 8), maca0hr);
+ mac[1] = FIELD_GET(GENMASK(7, 0), maca0hr);
+ mac[2] = FIELD_GET(GENMASK(31, 24), maca0lr);
+ mac[3] = FIELD_GET(GENMASK(23, 16), maca0lr);
+ mac[4] = FIELD_GET(GENMASK(15, 8), maca0lr);
+ mac[5] = FIELD_GET(GENMASK(7, 0), maca0lr);
+
+ return 0;
+}
+
+static void motorcomm_deassert_mdio_phy_reset(struct dwmac_motorcomm_priv *priv)
+{
+ u32 reg = readl(priv->base + EPHY_CTRL);
+
+ reg |= EPHY_MDIO_PHY_RESET;
+
+ writel(reg, priv->base + EPHY_CTRL);
+}
+
+static void motorcomm_reset(struct dwmac_motorcomm_priv *priv)
+{
+ u32 reg = readl(priv->base + SYS_RESET);
+
+ reg &= ~SYS_RESET_RESET;
+ writel(reg, priv->base + SYS_RESET);
+
+ reg |= SYS_RESET_RESET;
+ writel(reg, priv->base + SYS_RESET);
+
+ motorcomm_deassert_mdio_phy_reset(priv);
+}
+
+static void motorcomm_init(struct dwmac_motorcomm_priv *priv)
+{
+ writel(0x0, priv->base + MGMT_INT_CTRL0);
+
+ writel(FIELD_PREP(INT_MODERATION_RX, 200) |
+ FIELD_PREP(INT_MODERATION_TX, 200),
+ priv->base + INT_MODERATION);
+
+ /*
+ * OOB WOL must be disabled during normal operation, or DMA interrupts
+ * cannot be delivered to the host.
+ */
+ writel(OOB_WOL_CTRL_DIS, priv->base + OOB_WOL_CTRL);
+}
+
+static struct plat_stmmacenet_data *
+motorcomm_default_plat_data(struct pci_dev *pdev)
+{
+ struct plat_stmmacenet_data *plat;
+ struct device *dev = &pdev->dev;
+
+ plat = devm_kzalloc(dev, sizeof(*plat), GFP_KERNEL);
+ if (!plat)
+ return NULL;
+
+ plat->mdio_bus_data = devm_kzalloc(dev, sizeof(*plat->mdio_bus_data),
+ GFP_KERNEL);
+ if (!plat->mdio_bus_data)
+ return NULL;
+
+ plat->dma_cfg = devm_kzalloc(dev, sizeof(*plat->dma_cfg), GFP_KERNEL);
+ if (!plat->dma_cfg)
+ return NULL;
+
+ plat->axi = devm_kzalloc(dev, sizeof(*plat->axi), GFP_KERNEL);
+ if (!plat->axi)
+ return NULL;
+
+ plat->dma_cfg->pbl = DEFAULT_DMA_PBL;
+ plat->dma_cfg->pblx8 = true;
+ plat->dma_cfg->txpbl = 32;
+ plat->dma_cfg->rxpbl = 32;
+ plat->dma_cfg->eame = true;
+ plat->dma_cfg->mixed_burst = true;
+
+ plat->axi->axi_wr_osr_lmt = 1;
+ plat->axi->axi_rd_osr_lmt = 1;
+ plat->axi->axi_mb = true;
+ plat->axi->axi_blen[0] = 4;
+ plat->axi->axi_blen[1] = 8;
+ plat->axi->axi_blen[2] = 16;
+ plat->axi->axi_blen[3] = 32;
+
+ plat->bus_id = pci_dev_id(pdev);
+ plat->phy_addr = -1;
+ plat->phy_interface = PHY_INTERFACE_MODE_GMII;
+ /*
+ * YT6801 requires an 25MHz clock input/oscillator to function, which
+ * is likely the source of CSR clock.
+ */
+ plat->clk_csr = STMMAC_CSR_20_35M;
+ plat->tx_coe = 1;
+ plat->rx_coe = 1;
+ plat->maxmtu = JUMBO_LEN;
+ plat->rx_queues_to_use = 1;
+ plat->tx_queues_to_use = 1;
+ plat->clk_ref_rate = 125000000;
+ plat->has_gmac4 = 1;
+ plat->flags = STMMAC_FLAG_TSO_EN;
+
+ return plat;
+}
+
+static void motorcomm_free_irq(void *data)
+{
+ struct pci_dev *pdev = data;
+
+ pci_free_irq_vectors(pdev);
+}
+
+static int motorcomm_setup_irq(struct pci_dev *pdev,
+ struct stmmac_resources *res,
+ struct plat_stmmacenet_data *plat)
+{
+ int ret;
+
+ ret = pci_alloc_irq_vectors(pdev, 6, 6, PCI_IRQ_MSIX);
+ if (ret > 0) {
+ res->rx_irq[0] = pci_irq_vector(pdev, 0);
+ res->tx_irq[0] = pci_irq_vector(pdev, 4);
+ res->irq = pci_irq_vector(pdev, 5);
+
+ plat->flags |= STMMAC_FLAG_MULTI_MSI_EN;
+ } else {
+ dev_info(&pdev->dev, "failed to allocate MSI-X vector: %d\n",
+ ret);
+ dev_info(&pdev->dev, "try MSI instead\n");
+
+ ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI);
+ if (ret < 0)
+ return dev_err_probe(&pdev->dev, ret,
+ "failed to allocate MSI\n");
+
+ res->irq = pci_irq_vector(pdev, 0);
+ }
+
+ return devm_add_action_or_reset(&pdev->dev, motorcomm_free_irq, pdev);
+}
+
+static int motorcomm_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+ struct plat_stmmacenet_data *plat;
+ struct dwmac_motorcomm_priv *priv;
+ struct stmmac_resources res = {};
+ int ret;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ plat = motorcomm_default_plat_data(pdev);
+ if (!plat)
+ return -ENOMEM;
+
+ plat->bsp_priv = priv;
+
+ ret = pcim_enable_device(pdev);
+ if (ret)
+ return dev_err_probe(&pdev->dev, ret,
+ "failed to enable device\n");
+
+ priv->base = pcim_iomap_region(pdev, 0, DRIVER_NAME);
+ if (IS_ERR(priv->base))
+ return dev_err_probe(&pdev->dev, PTR_ERR(priv->base),
+ "failed to map IO region\n");
+
+ pci_set_master(pdev);
+
+ /*
+ * Some PCIe addons cards based on YT6801 don't deliver MSI(X) with ASPM
+ * enabled. Sadly there isn't a reliable way to read out OEM of the
+ * card, so let's disable L1 state unconditionally for safety.
+ */
+ ret = pci_disable_link_state(pdev, PCIE_LINK_STATE_L1);
+ if (ret)
+ dev_warn(&pdev->dev, "failed to disable L1 state: %d\n", ret);
+
+ motorcomm_reset(priv);
+
+ ret = motorcomm_efuse_read_mac(&pdev->dev, priv, res.mac);
+ if (ret == -ENOENT) {
+ dev_warn(&pdev->dev, "eFuse contains no valid MAC address\n");
+ dev_warn(&pdev->dev, "fallback to random MAC address\n");
+
+ eth_random_addr(res.mac);
+ } else if (ret) {
+ return dev_err_probe(&pdev->dev, ret,
+ "failed to read MAC address from eFuse\n");
+ }
+
+ ret = motorcomm_setup_irq(pdev, &res, plat);
+ if (ret)
+ return dev_err_probe(&pdev->dev, ret, "failed to setup IRQ\n");
+
+ motorcomm_init(priv);
+
+ res.addr = priv->base + GMAC_OFFSET;
+
+ return stmmac_dvr_probe(&pdev->dev, plat, &res);
+}
+
+static void motorcomm_remove(struct pci_dev *pdev)
+{
+ stmmac_dvr_remove(&pdev->dev);
+}
+
+static int __maybe_unused motorcomm_dwmac_suspend(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ int ret;
+
+ ret = stmmac_suspend(dev);
+ if (ret)
+ return ret;
+
+ ret = pci_save_state(pdev);
+ if (ret)
+ return ret;
+
+ pci_disable_device(pdev);
+ pci_wake_from_d3(pdev, true);
+
+ return 0;
+}
+
+static int __maybe_unused motorcomm_dwmac_resume(struct device *dev)
+{
+ struct net_device *ndev = dev_get_drvdata(dev);
+ struct stmmac_priv *priv = netdev_priv(ndev);
+ struct pci_dev *pdev = to_pci_dev(dev);
+ int ret;
+
+ pci_restore_state(pdev);
+ pci_set_power_state(pdev, PCI_D0);
+
+ ret = pci_enable_device(pdev);
+ if (ret)
+ return ret;
+
+ pci_set_master(pdev);
+
+ /*
+ * When recovering from D3hot, EPHY_MDIO_PHY_RESET is automatically
+ * asserted, and must be deasserted for normal operation.
+ */
+ motorcomm_deassert_mdio_phy_reset(priv->plat->bsp_priv);
+ motorcomm_init(priv->plat->bsp_priv);
+
+ return stmmac_resume(dev);
+}
+
+static SIMPLE_DEV_PM_OPS(motorcomm_dwmac_pm_ops, motorcomm_dwmac_suspend,
+ motorcomm_dwmac_resume);
+
+static const struct pci_device_id dwmac_motorcomm_pci_id_table[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_MOTORCOMM, 0x6801) },
+ { },
+};
+MODULE_DEVICE_TABLE(pci, dwmac_motorcomm_pci_id_table);
+
+static struct pci_driver dwmac_motorcomm_pci_driver = {
+ .name = DRIVER_NAME,
+ .id_table = dwmac_motorcomm_pci_id_table,
+ .probe = motorcomm_probe,
+ .remove = motorcomm_remove,
+ .driver = {
+ .pm = &motorcomm_dwmac_pm_ops,
+ },
+};
+
+module_pci_driver(dwmac_motorcomm_pci_driver);
+
+MODULE_DESCRIPTION("DWMAC glue driver for Motorcomm PCI Ethernet controllers");
+MODULE_AUTHOR("Yao Zi <me@ziyao.cc>");
+MODULE_LICENSE("GPL");
target/linux/generic/backport-6.18/705-01-v7.0-net-phy-motorcomm-Support-YT8531S-PHY-in-YT6801-Ethernet.patch
+36
View File
@@ -0,0 +1,36 @@
From 365e649361cde842c720ffa4b6a22fe092287990 Mon Sep 17 00:00:00 2001
From: Yao Zi <me@ziyao.cc>
Date: Fri, 9 Jan 2026 09:34:44 +0000
Subject: [PATCH] net: phy: motorcomm: Support YT8531S PHY in YT6801 Ethernet
controller
YT6801's internal PHY is confirmed as a GMII-capable variant of YT8531S
by a previous series[1] and reading PHY ID. Add support for
PHY_INTERFACE_MODE_GMII for YT8531S to allow the Ethernet driver to
reuse the PHY code for its internal PHY.
Link: https://lore.kernel.org/all/a48d76ac-db08-46d5-9528-f046a7b541dc@motor-comm.com/ # [1]
Co-developed-by: Frank Sae <Frank.Sae@motor-comm.com>
Signed-off-by: Frank Sae <Frank.Sae@motor-comm.com>
Signed-off-by: Yao Zi <me@ziyao.cc>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/20260109093445.46791-3-me@ziyao.cc
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
drivers/net/phy/motorcomm.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/net/phy/motorcomm.c
+++ b/drivers/net/phy/motorcomm.c
@@ -910,6 +910,10 @@ static int ytphy_rgmii_clk_delay_config(
val |= FIELD_PREP(YT8521_RC1R_RX_DELAY_MASK, rx_reg) |
FIELD_PREP(YT8521_RC1R_GE_TX_DELAY_MASK, tx_reg);
break;
+ case PHY_INTERFACE_MODE_GMII:
+ if (phydev->drv->phy_id != PHY_ID_YT8531S)
+ return -EOPNOTSUPP;
+ return 0;
default: /* do not support other modes */
return -EOPNOTSUPP;
}
target/linux/generic/backport-6.18/705-02-v7.0-net-stmmac-Add-glue-driver-for-Motorcomm-YT6801-ethernet.patch
+467
View File
@@ -0,0 +1,467 @@
From 02ff155ea2812ea25a086665522fd4fa196ef0ce Mon Sep 17 00:00:00 2001
From: Yao Zi <me@ziyao.cc>
Date: Fri, 9 Jan 2026 09:34:45 +0000
Subject: [PATCH] net: stmmac: Add glue driver for Motorcomm YT6801 ethernet
controller
Motorcomm YT6801 is a PCIe ethernet controller based on DWMAC4 IP. It
integrates an GbE phy, supporting WOL, VLAN tagging and various types
of offloading. It ships an on-chip eFuse for storing various vendor
configuration, including MAC address.
This patch adds basic glue code for the controller, allowing it to be
set up and transmit data at a reasonable speed. Features like WOL could
be implemented in the future.
Signed-off-by: Yao Zi <me@ziyao.cc>
Tested-by: Mingcong Bai <jeffbai@aosc.io>
Tested-by: Runhua He <hua@aosc.io>
Tested-by: Xi Ruoyao <xry111@xry111.site>
Reviewed-by: Sai Krishna <saikrishnag@marvell.com>
Link: https://patch.msgid.link/20260109093445.46791-4-me@ziyao.cc
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
drivers/net/ethernet/stmicro/stmmac/Kconfig | 9 +
drivers/net/ethernet/stmicro/stmmac/Makefile | 1 +
.../ethernet/stmicro/stmmac/dwmac-motorcomm.c | 384 ++++++++++++++++++
3 files changed, 394 insertions(+)
create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-motorcomm.c
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -358,6 +358,14 @@ config DWMAC_LOONGSON
This selects the LOONGSON PCI bus support for the stmmac driver,
Support for ethernet controller on Loongson-2K1000 SoC and LS7A1000 bridge.
+config DWMAC_MOTORCOMM
+ tristate "Motorcomm PCI DWMAC support"
+ depends on PCI
+ select MOTORCOMM_PHY
+ help
+ This enables glue driver for Motorcomm DWMAC-based PCI Ethernet
+ controllers. Currently only YT6801 is supported.
+
config STMMAC_PCI
tristate "STMMAC PCI bus support"
depends on STMMAC_ETH && PCI
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -46,4 +46,5 @@ dwmac-altr-socfpga-objs := dwmac-socfpga
obj-$(CONFIG_STMMAC_PCI) += stmmac-pci.o
obj-$(CONFIG_DWMAC_INTEL) += dwmac-intel.o
obj-$(CONFIG_DWMAC_LOONGSON) += dwmac-loongson.o
+obj-$(CONFIG_DWMAC_MOTORCOMM) += dwmac-motorcomm.o
stmmac-pci-objs:= stmmac_pci.o
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-motorcomm.c
@@ -0,0 +1,410 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * DWMAC glue driver for Motorcomm PCI Ethernet controllers
+ *
+ * Copyright (c) 2025-2026 Yao Zi <me@ziyao.cc>
+ */
+
+#include <linux/bits.h>
+#include <linux/dev_printk.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/stmmac.h>
+
+#include "dwmac4.h"
+#include "stmmac.h"
+
+#define DRIVER_NAME "dwmac-motorcomm"
+
+#define PCI_VENDOR_ID_MOTORCOMM 0x1f0a
+
+/* Register definition */
+#define EPHY_CTRL 0x1004
+/* Clearing this bit asserts resets for internal MDIO bus and PHY */
+#define EPHY_MDIO_PHY_RESET BIT(0)
+#define OOB_WOL_CTRL 0x1010
+#define OOB_WOL_CTRL_DIS BIT(0)
+#define MGMT_INT_CTRL0 0x1100
+#define INT_MODERATION 0x1108
+#define INT_MODERATION_RX GENMASK(11, 0)
+#define INT_MODERATION_TX GENMASK(27, 16)
+#define EFUSE_OP_CTRL_0 0x1500
+#define EFUSE_OP_MODE GENMASK(1, 0)
+#define EFUSE_OP_ROW_READ 0x1
+#define EFUSE_OP_START BIT(2)
+#define EFUSE_OP_ADDR GENMASK(15, 8)
+#define EFUSE_OP_CTRL_1 0x1504
+#define EFUSE_OP_DONE BIT(1)
+#define EFUSE_OP_RD_DATA GENMASK(31, 24)
+#define SYS_RESET 0x152c
+#define SYS_RESET_RESET BIT(31)
+#define GMAC_OFFSET 0x2000
+
+/* Constants */
+#define EFUSE_READ_TIMEOUT_US 20000
+#define EFUSE_PATCH_REGION_OFFSET 18
+#define EFUSE_PATCH_MAX_NUM 39
+#define EFUSE_ADDR_MACA0LR 0x1520
+#define EFUSE_ADDR_MACA0HR 0x1524
+
+struct motorcomm_efuse_patch {
+ __le16 addr;
+ __le32 data;
+} __packed;
+
+struct dwmac_motorcomm_priv {
+ void __iomem *base;
+};
+
+static int motorcomm_efuse_read_byte(struct dwmac_motorcomm_priv *priv,
+ u8 offset, u8 *byte)
+{
+ u32 reg;
+ int ret;
+
+ writel(FIELD_PREP(EFUSE_OP_MODE, EFUSE_OP_ROW_READ) |
+ FIELD_PREP(EFUSE_OP_ADDR, offset) |
+ EFUSE_OP_START, priv->base + EFUSE_OP_CTRL_0);
+
+ ret = readl_poll_timeout(priv->base + EFUSE_OP_CTRL_1,
+ reg, reg & EFUSE_OP_DONE, 2000,
+ EFUSE_READ_TIMEOUT_US);
+
+ *byte = FIELD_GET(EFUSE_OP_RD_DATA, reg);
+
+ return ret;
+}
+
+static int motorcomm_efuse_read_patch(struct dwmac_motorcomm_priv *priv,
+ u8 index,
+ struct motorcomm_efuse_patch *patch)
+{
+ u8 *p = (u8 *)patch, offset;
+ int i, ret;
+
+ for (i = 0; i < sizeof(*patch); i++) {
+ offset = EFUSE_PATCH_REGION_OFFSET + sizeof(*patch) * index + i;
+
+ ret = motorcomm_efuse_read_byte(priv, offset, &p[i]);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int motorcomm_efuse_get_patch_value(struct dwmac_motorcomm_priv *priv,
+ u16 addr, u32 *value)
+{
+ struct motorcomm_efuse_patch patch;
+ int i, ret;
+
+ for (i = 0; i < EFUSE_PATCH_MAX_NUM; i++) {
+ ret = motorcomm_efuse_read_patch(priv, i, &patch);
+ if (ret)
+ return ret;
+
+ if (patch.addr == 0) {
+ return -ENOENT;
+ } else if (le16_to_cpu(patch.addr) == addr) {
+ *value = le32_to_cpu(patch.data);
+ return 0;
+ }
+ }
+
+ return -ENOENT;
+}
+
+static int motorcomm_efuse_read_mac(struct device *dev,
+ struct dwmac_motorcomm_priv *priv, u8 *mac)
+{
+ u32 maca0lr, maca0hr;
+ int ret;
+
+ ret = motorcomm_efuse_get_patch_value(priv, EFUSE_ADDR_MACA0LR,
+ &maca0lr);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "failed to read maca0lr from eFuse\n");
+
+ ret = motorcomm_efuse_get_patch_value(priv, EFUSE_ADDR_MACA0HR,
+ &maca0hr);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "failed to read maca0hr from eFuse\n");
+
+ mac[0] = FIELD_GET(GENMASK(15, 8), maca0hr);
+ mac[1] = FIELD_GET(GENMASK(7, 0), maca0hr);
+ mac[2] = FIELD_GET(GENMASK(31, 24), maca0lr);
+ mac[3] = FIELD_GET(GENMASK(23, 16), maca0lr);
+ mac[4] = FIELD_GET(GENMASK(15, 8), maca0lr);
+ mac[5] = FIELD_GET(GENMASK(7, 0), maca0lr);
+
+ return 0;
+}
+
+static void motorcomm_deassert_mdio_phy_reset(struct dwmac_motorcomm_priv *priv)
+{
+ u32 reg = readl(priv->base + EPHY_CTRL);
+
+ reg |= EPHY_MDIO_PHY_RESET;
+
+ writel(reg, priv->base + EPHY_CTRL);
+}
+
+static void motorcomm_reset(struct dwmac_motorcomm_priv *priv)
+{
+ u32 reg = readl(priv->base + SYS_RESET);
+
+ reg &= ~SYS_RESET_RESET;
+ writel(reg, priv->base + SYS_RESET);
+
+ reg |= SYS_RESET_RESET;
+ writel(reg, priv->base + SYS_RESET);
+
+ motorcomm_deassert_mdio_phy_reset(priv);
+}
+
+static void motorcomm_init(struct dwmac_motorcomm_priv *priv)
+{
+ writel(0x0, priv->base + MGMT_INT_CTRL0);
+
+ writel(FIELD_PREP(INT_MODERATION_RX, 200) |
+ FIELD_PREP(INT_MODERATION_TX, 200),
+ priv->base + INT_MODERATION);
+
+ /*
+ * OOB WOL must be disabled during normal operation, or DMA interrupts
+ * cannot be delivered to the host.
+ */
+ writel(OOB_WOL_CTRL_DIS, priv->base + OOB_WOL_CTRL);
+}
+
+static int motorcomm_suspend(struct device *dev, void *bsp_priv)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ int ret;
+
+ ret = pci_save_state(pdev);
+ if (ret)
+ return ret;
+
+ pci_disable_device(pdev);
+ pci_wake_from_d3(pdev, true);
+
+ return 0;
+}
+
+static int motorcomm_resume(struct device *dev, void *bsp_priv)
+{
+ struct dwmac_motorcomm_priv *priv = bsp_priv;
+ struct pci_dev *pdev = to_pci_dev(dev);
+ int ret;
+
+ pci_restore_state(pdev);
+ pci_set_power_state(pdev, PCI_D0);
+
+ ret = pci_enable_device(pdev);
+ if (ret)
+ return ret;
+
+ pci_set_master(pdev);
+
+ /*
+ * When recovering from D3hot, EPHY_MDIO_PHY_RESET is automatically
+ * asserted, and must be deasserted for normal operation.
+ */
+ motorcomm_deassert_mdio_phy_reset(priv);
+ motorcomm_init(priv);
+
+ return 0;
+}
+
+static struct plat_stmmacenet_data *
+motorcomm_default_plat_data(struct pci_dev *pdev)
+{
+ struct plat_stmmacenet_data *plat;
+ struct device *dev = &pdev->dev;
+
+ plat = devm_kzalloc(dev, sizeof(*plat), GFP_KERNEL);
+ if (!plat)
+ return NULL;
+
+ plat->mdio_bus_data = devm_kzalloc(dev, sizeof(*plat->mdio_bus_data),
+ GFP_KERNEL);
+ if (!plat->mdio_bus_data)
+ return NULL;
+
+ plat->dma_cfg = devm_kzalloc(dev, sizeof(*plat->dma_cfg), GFP_KERNEL);
+ if (!plat->dma_cfg)
+ return NULL;
+
+ plat->axi = devm_kzalloc(dev, sizeof(*plat->axi), GFP_KERNEL);
+ if (!plat->axi)
+ return NULL;
+
+ plat->dma_cfg->pbl = DEFAULT_DMA_PBL;
+ plat->dma_cfg->pblx8 = true;
+ plat->dma_cfg->txpbl = 32;
+ plat->dma_cfg->rxpbl = 32;
+ plat->dma_cfg->eame = true;
+ plat->dma_cfg->mixed_burst = true;
+
+ plat->axi->axi_wr_osr_lmt = 1;
+ plat->axi->axi_rd_osr_lmt = 1;
+ plat->axi->axi_mb = true;
+ plat->axi->axi_blen[0] = 4;
+ plat->axi->axi_blen[1] = 8;
+ plat->axi->axi_blen[2] = 16;
+ plat->axi->axi_blen[3] = 32;
+
+ plat->bus_id = pci_dev_id(pdev);
+ plat->phy_addr = -1;
+ plat->phy_interface = PHY_INTERFACE_MODE_GMII;
+ /*
+ * YT6801 requires an 25MHz clock input/oscillator to function, which
+ * is likely the source of CSR clock.
+ */
+ plat->clk_csr = STMMAC_CSR_20_35M;
+ plat->tx_coe = 1;
+ plat->rx_coe = 1;
+ plat->maxmtu = JUMBO_LEN;
+ plat->rx_queues_to_use = 1;
+ plat->tx_queues_to_use = 1;
+ plat->clk_ref_rate = 125000000;
+ plat->core_type = DWMAC_CORE_GMAC4;
+ plat->suspend = motorcomm_suspend;
+ plat->resume = motorcomm_resume;
+ plat->flags = STMMAC_FLAG_TSO_EN |
+ STMMAC_FLAG_EN_TX_LPI_CLK_PHY_CAP;
+
+ return plat;
+}
+
+static void motorcomm_free_irq(void *data)
+{
+ struct pci_dev *pdev = data;
+
+ pci_free_irq_vectors(pdev);
+}
+
+static int motorcomm_setup_irq(struct pci_dev *pdev,
+ struct stmmac_resources *res,
+ struct plat_stmmacenet_data *plat)
+{
+ int ret;
+
+ ret = pci_alloc_irq_vectors(pdev, 6, 6, PCI_IRQ_MSIX);
+ if (ret > 0) {
+ res->rx_irq[0] = pci_irq_vector(pdev, 0);
+ res->tx_irq[0] = pci_irq_vector(pdev, 4);
+ res->irq = pci_irq_vector(pdev, 5);
+
+ plat->flags |= STMMAC_FLAG_MULTI_MSI_EN;
+ } else {
+ dev_info(&pdev->dev, "failed to allocate MSI-X vector: %d\n",
+ ret);
+ dev_info(&pdev->dev, "try MSI instead\n");
+
+ ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI);
+ if (ret < 0)
+ return dev_err_probe(&pdev->dev, ret,
+ "failed to allocate MSI\n");
+
+ res->irq = pci_irq_vector(pdev, 0);
+ }
+
+ return devm_add_action_or_reset(&pdev->dev, motorcomm_free_irq, pdev);
+}
+
+static int motorcomm_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+ struct plat_stmmacenet_data *plat;
+ struct dwmac_motorcomm_priv *priv;
+ struct stmmac_resources res = {};
+ int ret;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ plat = motorcomm_default_plat_data(pdev);
+ if (!plat)
+ return -ENOMEM;
+
+ plat->bsp_priv = priv;
+
+ ret = pcim_enable_device(pdev);
+ if (ret)
+ return dev_err_probe(&pdev->dev, ret,
+ "failed to enable device\n");
+
+ priv->base = pcim_iomap_region(pdev, 0, DRIVER_NAME);
+ if (IS_ERR(priv->base))
+ return dev_err_probe(&pdev->dev, PTR_ERR(priv->base),
+ "failed to map IO region\n");
+
+ pci_set_master(pdev);
+
+ /*
+ * Some PCIe addons cards based on YT6801 don't deliver MSI(X) with ASPM
+ * enabled. Sadly there isn't a reliable way to read out OEM of the
+ * card, so let's disable L1 state unconditionally for safety.
+ */
+ ret = pci_disable_link_state(pdev, PCIE_LINK_STATE_L1);
+ if (ret)
+ dev_warn(&pdev->dev, "failed to disable L1 state: %d\n", ret);
+
+ motorcomm_reset(priv);
+
+ ret = motorcomm_efuse_read_mac(&pdev->dev, priv, res.mac);
+ if (ret == -ENOENT) {
+ dev_warn(&pdev->dev, "eFuse contains no valid MAC address\n");
+ dev_warn(&pdev->dev, "fallback to random MAC address\n");
+
+ eth_random_addr(res.mac);
+ } else if (ret) {
+ return dev_err_probe(&pdev->dev, ret,
+ "failed to read MAC address from eFuse\n");
+ }
+
+ ret = motorcomm_setup_irq(pdev, &res, plat);
+ if (ret)
+ return dev_err_probe(&pdev->dev, ret, "failed to setup IRQ\n");
+
+ motorcomm_init(priv);
+
+ res.addr = priv->base + GMAC_OFFSET;
+
+ return stmmac_dvr_probe(&pdev->dev, plat, &res);
+}
+
+static void motorcomm_remove(struct pci_dev *pdev)
+{
+ stmmac_dvr_remove(&pdev->dev);
+}
+
+static const struct pci_device_id dwmac_motorcomm_pci_id_table[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_MOTORCOMM, 0x6801) },
+ { },
+};
+MODULE_DEVICE_TABLE(pci, dwmac_motorcomm_pci_id_table);
+
+static struct pci_driver dwmac_motorcomm_pci_driver = {
+ .name = DRIVER_NAME,
+ .id_table = dwmac_motorcomm_pci_id_table,
+ .probe = motorcomm_probe,
+ .remove = motorcomm_remove,
+ .driver = {
+ .pm = &stmmac_simple_pm_ops,
+ },
+};
+
+module_pci_driver(dwmac_motorcomm_pci_driver);
+
+MODULE_DESCRIPTION("DWMAC glue driver for Motorcomm PCI Ethernet controllers");
+MODULE_AUTHOR("Yao Zi <me@ziyao.cc>");
+MODULE_LICENSE("GPL");
target/linux/generic/config-6.12
+1
View File
@@ -1860,6 +1860,7 @@ CONFIG_DVB_MAX_ADAPTERS=16
# CONFIG_DWMAC_LOONGSON is not set
# CONFIG_DWMAC_LPC18XX is not set
# CONFIG_DWMAC_MESON is not set
# CONFIG_DWMAC_MOTORCOMM is not set
# CONFIG_DWMAC_ROCKCHIP is not set
# CONFIG_DWMAC_SOCFPGA is not set
# CONFIG_DWMAC_STI is not set
target/linux/generic/config-6.18
+1
View File
@@ -1946,6 +1946,7 @@ CONFIG_DVB_MAX_ADAPTERS=16
# CONFIG_DWMAC_LOONGSON is not set
# CONFIG_DWMAC_LPC18XX is not set
# CONFIG_DWMAC_MESON is not set
# CONFIG_DWMAC_MOTORCOMM is not set
# CONFIG_DWMAC_ROCKCHIP is not set
# CONFIG_DWMAC_SOCFPGA is not set
# CONFIG_DWMAC_STI is not set
target/linux/generic/hack-6.12/755-net-phy-motorcomm-yt8821-bus-collision-workaround.patch
+1 -1
View File
@@ -59,7 +59,7 @@ Signed-off-by: Jakub Vaněk <linuxtardis@gmail.com>
#define YTPHY_MISC_CONFIG_REG 0xA006
#define YTPHY_MCR_FIBER_SPEED_MASK BIT(0)
#define YTPHY_MCR_FIBER_1000BX (0x1 << 0)
@@ -2659,6 +2662,23 @@ static int yt8821_config_init(struct phy
@@ -2663,6 +2666,23 @@ static int yt8821_config_init(struct phy
int ret;
u16 set;
target/linux/generic/hack-6.18/755-net-phy-motorcomm-yt8821-bus-collision-workaround.patch
+1 -1
View File
@@ -59,7 +59,7 @@ Signed-off-by: Jakub Vaněk <linuxtardis@gmail.com>
#define YTPHY_MISC_CONFIG_REG 0xA006
#define YTPHY_MCR_FIBER_SPEED_MASK BIT(0)
#define YTPHY_MCR_FIBER_1000BX (0x1 << 0)
@@ -2773,6 +2776,23 @@ static int yt8821_config_init(struct phy
@@ -2777,6 +2780,23 @@ static int yt8821_config_init(struct phy
int ret;
u16 set;