1 files changed, 449 insertions, 0 deletions

diff --git a/drivers/net/dwc_eth_qos_intel.c b/drivers/net/dwc_eth_qos_intel.c
new file mode 100644
index 00000000000..a2c68257329
--- /dev/null
+++ b/drivers/net/dwc_eth_qos_intel.c
@@ -0,0 +1,449 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2023-2024 DENX Software Engineering GmbH
+ * Philip Oberfichtner <pro@denx.de>
+ *
+ * Based on linux v6.6.39, especially drivers/net/ethernet/stmicro/stmmac
+ */
+
+#include <asm/io.h>
+#include <dm.h>
+#include <dm/device_compat.h>
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <miiphy.h>
+#include <net.h>
+#include <pci.h>
+
+#include "dwc_eth_qos.h"
+#include "dwc_eth_qos_intel.h"
+
+static struct pci_device_id intel_pci_ids[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_EHL_RGMII1G) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_EHL_SGMII1) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_EHL_SGMII2G5) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_EHL_PSE0_RGMII1G) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_EHL_PSE0_SGMII1G) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_EHL_PSE0_SGMII2G5) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_EHL_PSE1_RGMII1G) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_EHL_PSE1_SGMII1G) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_EHL_PSE1_SGMII2G5) },
+	{}
+};
+
+static int pci_config(struct udevice *dev)
+{
+	u32 val;
+
+	/* Try to enable I/O accesses and bus-mastering */
+	dm_pci_read_config32(dev, PCI_COMMAND, &val);
+	val |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
+	dm_pci_write_config32(dev, PCI_COMMAND, val);
+
+	/* Make sure it worked */
+	dm_pci_read_config32(dev, PCI_COMMAND, &val);
+	if (!(val & PCI_COMMAND_MEMORY)) {
+		dev_err(dev, "%s: Can't enable I/O memory\n", __func__);
+		return -ENOSPC;
+	}
+
+	if (!(val & PCI_COMMAND_MASTER)) {
+		dev_err(dev, "%s: Can't enable bus-mastering\n", __func__);
+		return -EPERM;
+	}
+
+	return 0;
+}
+
+static void limit_fifo_size(struct udevice *dev)
+{
+	/*
+	 * As described in Intel Erratum EHL22, Document Number: 636674-2.1,
+	 * the PSE GbE Controllers advertise a wrong RX and TX fifo size.
+	 * Software should limit this value to 64KB.
+	 */
+	struct eqos_priv *eqos = dev_get_priv(dev);
+
+	eqos->tx_fifo_sz = 0x8000;
+	eqos->rx_fifo_sz = 0x8000;
+}
+
+static int serdes_status_poll(struct udevice *dev,
+			      unsigned char phyaddr, unsigned char phyreg,
+			      unsigned short mask, unsigned short val)
+{
+	struct eqos_priv *eqos = dev_get_priv(dev);
+	unsigned int retries = 10;
+	unsigned short val_rd;
+
+	do {
+		miiphy_read(eqos->mii->name, phyaddr, phyreg, &val_rd);
+		if ((val_rd & mask) == (val & mask))
+			return 0;
+		udelay(POLL_DELAY_US);
+	} while (--retries);
+
+	return -ETIMEDOUT;
+}
+
+ /* Returns -ve if MAC is unknown and 0 on success */
+static int mac_check_pse(const struct udevice *dev, bool *is_pse)
+{
+	struct pci_child_plat *plat = dev_get_parent_plat(dev);
+
+	if (!plat || plat->vendor != PCI_VENDOR_ID_INTEL)
+		return -ENXIO;
+
+	switch (plat->device) {
+	case PCI_DEVICE_ID_INTEL_EHL_PSE0_RGMII1G:
+	case PCI_DEVICE_ID_INTEL_EHL_PSE1_RGMII1G:
+	case PCI_DEVICE_ID_INTEL_EHL_PSE0_SGMII1G:
+	case PCI_DEVICE_ID_INTEL_EHL_PSE1_SGMII1G:
+	case PCI_DEVICE_ID_INTEL_EHL_PSE0_SGMII2G5:
+	case PCI_DEVICE_ID_INTEL_EHL_PSE1_SGMII2G5:
+		*is_pse = 1;
+		return 0;
+
+	case PCI_DEVICE_ID_INTEL_EHL_RGMII1G:
+	case PCI_DEVICE_ID_INTEL_EHL_SGMII1:
+	case PCI_DEVICE_ID_INTEL_EHL_SGMII2G5:
+		*is_pse = 0;
+		return 0;
+	};
+
+	return -ENXIO;
+}
+
+/* Check if we're in 2G5 mode */
+static bool serdes_link_mode_2500(struct udevice *dev)
+{
+	const unsigned char phyad = INTEL_MGBE_ADHOC_ADDR;
+	struct eqos_priv *eqos = dev_get_priv(dev);
+	unsigned short data;
+
+	miiphy_read(eqos->mii->name, phyad, SERDES_GCR, &data);
+	if (FIELD_GET(SERDES_LINK_MODE_MASK, data) == SERDES_LINK_MODE_2G5)
+		return true;
+
+	return false;
+}
+
+static int serdes_powerup(struct udevice *dev)
+{
+	/* Based on linux/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c */
+
+	const unsigned char phyad = INTEL_MGBE_ADHOC_ADDR;
+	struct eqos_priv *eqos = dev_get_priv(dev);
+	unsigned short data;
+	int ret;
+	bool is_pse;
+
+	/* Set the serdes rate and the PCLK rate */
+	miiphy_read(eqos->mii->name, phyad, SERDES_GCR0, &data);
+
+	data &= ~SERDES_RATE_MASK;
+	data &= ~SERDES_PCLK_MASK;
+
+	if (serdes_link_mode_2500(dev))
+		data |= SERDES_RATE_PCIE_GEN2 << SERDES_RATE_PCIE_SHIFT |
+			SERDES_PCLK_37p5MHZ << SERDES_PCLK_SHIFT;
+	else
+		data |= SERDES_RATE_PCIE_GEN1 << SERDES_RATE_PCIE_SHIFT |
+			SERDES_PCLK_70MHZ << SERDES_PCLK_SHIFT;
+
+	miiphy_write(eqos->mii->name, phyad, SERDES_GCR0, data);
+
+	/* assert clk_req */
+	miiphy_read(eqos->mii->name, phyad, SERDES_GCR0, &data);
+	data |= SERDES_PLL_CLK;
+	miiphy_write(eqos->mii->name, phyad, SERDES_GCR0, data);
+
+	/* check for clk_ack assertion */
+	ret = serdes_status_poll(dev, phyad, SERDES_GSR0,
+				 SERDES_PLL_CLK, SERDES_PLL_CLK);
+
+	if (ret) {
+		dev_err(dev, "Serdes PLL clk request timeout\n");
+		return ret;
+	}
+
+	/* assert lane reset*/
+	miiphy_read(eqos->mii->name, phyad, SERDES_GCR0, &data);
+	data |= SERDES_RST;
+	miiphy_write(eqos->mii->name, phyad, SERDES_GCR0, data);
+
+	/* check for assert lane reset reflection */
+	ret = serdes_status_poll(dev, phyad, SERDES_GSR0,
+				 SERDES_RST, SERDES_RST);
+
+	if (ret) {
+		dev_err(dev, "Serdes assert lane reset timeout\n");
+		return ret;
+	}
+
+	/* move power state to P0 */
+	miiphy_read(eqos->mii->name, phyad, SERDES_GCR0, &data);
+	data &= ~SERDES_PWR_ST_MASK;
+	data |= SERDES_PWR_ST_P0 << SERDES_PWR_ST_SHIFT;
+	miiphy_write(eqos->mii->name, phyad, SERDES_GCR0, data);
+
+	/* Check for P0 state */
+	ret = serdes_status_poll(dev, phyad, SERDES_GSR0,
+				 SERDES_PWR_ST_MASK,
+				 SERDES_PWR_ST_P0 << SERDES_PWR_ST_SHIFT);
+
+	if (ret) {
+		dev_err(dev, "Serdes power state P0 timeout.\n");
+		return ret;
+	}
+
+	/* PSE only - ungate SGMII PHY Rx Clock*/
+	ret = mac_check_pse(dev, &is_pse);
+	if (ret) {
+		dev_err(dev, "Failed to determine MAC type.\n");
+		return ret;
+	}
+
+	if (is_pse) {
+		miiphy_read(eqos->mii->name, phyad, SERDES_GCR0, &data);
+		data |= SERDES_PHY_RX_CLK;
+		miiphy_write(eqos->mii->name, phyad, SERDES_GCR0, data);
+	}
+
+	return 0;
+}
+
+static int xpcs_access(struct udevice *dev, int reg, int v)
+{
+	/*
+	 * Common read/write helper function
+	 *
+	 * It may seem a bit odd at a first glance that we use bus->read()
+	 * directly insetad of one of the wrapper functions. But:
+	 *
+	 * (1) phy_read() can't be used because we do not access an acutal PHY,
+	 *     but a MAC-internal submodule.
+	 *
+	 * (2) miiphy_read() can't be used because it assumes MDIO_DEVAD_NONE.
+	 */
+
+	int port = INTEL_MGBE_XPCS_ADDR;
+	int devad = 0x1f;
+	u16 val;
+	struct eqos_priv *eqos;
+	struct mii_dev *bus;
+
+	eqos = dev_get_priv(dev);
+	bus = eqos->mii;
+
+	if (v < 0)
+		return bus->read(bus, port, devad, reg);
+
+	val = v;
+	return bus->write(bus, port, devad, reg, val);
+}
+
+static int xpcs_read(struct udevice *dev, int reg)
+{
+	return xpcs_access(dev, reg, -1);
+}
+
+static int xpcs_write(struct udevice *dev, int reg, u16 val)
+{
+	return xpcs_access(dev, reg, val);
+}
+
+static int xpcs_clr_bits(struct udevice *dev, int reg, u16 bits)
+{
+	int ret;
+
+	ret = xpcs_read(dev, reg);
+	if (ret < 0)
+		return ret;
+
+	ret &= ~bits;
+
+	return xpcs_write(dev, reg, ret);
+}
+
+static int xpcs_set_bits(struct udevice *dev, int reg, u16 bits)
+{
+	int ret;
+
+	ret = xpcs_read(dev, reg);
+	if (ret < 0)
+		return ret;
+
+	ret |= bits;
+
+	return xpcs_write(dev, reg, ret);
+}
+
+static int xpcs_init(struct udevice *dev)
+{
+	/* Based on linux/drivers/net/pcs/pcs-xpcs.c */
+	struct eqos_priv *eqos = dev_get_priv(dev);
+	phy_interface_t interface = eqos->config->interface(dev);
+
+	if (interface != PHY_INTERFACE_MODE_SGMII)
+		return 0;
+
+	if (xpcs_clr_bits(dev, VR_MII_MMD_CTRL,  XPCS_AN_CL37_EN)  ||
+	    xpcs_set_bits(dev, VR_MII_AN_CTRL,   XPCS_MODE_SGMII)  ||
+	    xpcs_set_bits(dev, VR_MII_DIG_CTRL1, XPCS_MAC_AUTO_SW) ||
+	    xpcs_set_bits(dev, VR_MII_MMD_CTRL,  XPCS_AN_CL37_EN))
+		return -EIO;
+
+	return 0;
+}
+
+static int eqos_probe_ressources_intel(struct udevice *dev)
+{
+	int ret;
+
+	ret = eqos_get_base_addr_pci(dev);
+	if (ret) {
+		dev_err(dev, "eqos_get_base_addr_pci failed: %d\n", ret);
+		return ret;
+	}
+
+	limit_fifo_size(dev);
+
+	ret = pci_config(dev);
+	if (ret) {
+		dev_err(dev, "pci_config failed: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+struct eqos_config eqos_intel_config;
+
+/*
+ * overwrite __weak function from eqos_intel.c
+ *
+ * For PCI devices the devcie tree is optional. Choose driver data based on PCI
+ * IDs instead.
+ */
+void *eqos_get_driver_data(struct udevice *dev)
+{
+	const struct pci_device_id *id;
+	const struct pci_child_plat *plat;
+
+	plat = dev_get_parent_plat(dev);
+
+	if (!plat)
+		return NULL;
+
+	/* last intel_pci_ids element is zero initialized */
+	for (id = intel_pci_ids; id->vendor != 0; id++) {
+		if (id->vendor == plat->vendor && id->device == plat->device)
+			return &eqos_intel_config;
+	}
+
+	return NULL;
+}
+
+static int eqos_start_resets_intel(struct udevice *dev)
+{
+	int ret;
+
+	ret = xpcs_init(dev);
+	if (ret) {
+		dev_err(dev, "xpcs init failed.\n");
+		return ret;
+	}
+
+	ret = serdes_powerup(dev);
+	if (ret) {
+		dev_err(dev, "Failed to power up serdes.\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static ulong eqos_get_tick_clk_rate_intel(struct udevice *dev)
+{
+	return 0;
+}
+
+static int eqos_get_enetaddr_intel(struct udevice *dev)
+{
+	/* Assume MAC address is programmed by previous boot stage */
+	struct eth_pdata *plat = dev_get_plat(dev);
+	struct eqos_priv *eqos = dev_get_priv(dev);
+	u8 *lo = (u8 *)&eqos->mac_regs->address0_low;
+	u8 *hi = (u8 *)&eqos->mac_regs->address0_high;
+
+	plat->enetaddr[0] = lo[0];
+	plat->enetaddr[1] = lo[1];
+	plat->enetaddr[2] = lo[2];
+	plat->enetaddr[3] = lo[3];
+	plat->enetaddr[4] = hi[0];
+	plat->enetaddr[5] = hi[1];
+
+	return 0;
+}
+
+static phy_interface_t eqos_get_interface_intel(const struct udevice *dev)
+{
+	struct pci_child_plat *plat = dev_get_parent_plat(dev);
+
+	if (!plat || plat->vendor != PCI_VENDOR_ID_INTEL)
+		return PHY_INTERFACE_MODE_NA;
+
+	switch (plat->device) {
+	/* The GbE Host Controller has no RGMII interface */
+	case PCI_DEVICE_ID_INTEL_EHL_RGMII1G:
+		return PHY_INTERFACE_MODE_NA;
+
+	case PCI_DEVICE_ID_INTEL_EHL_PSE0_RGMII1G:
+	case PCI_DEVICE_ID_INTEL_EHL_PSE1_RGMII1G:
+		return PHY_INTERFACE_MODE_RGMII;
+
+	/* Host SGMII and Host SGMII2G5 share the same device id */
+	case PCI_DEVICE_ID_INTEL_EHL_SGMII1:
+	case PCI_DEVICE_ID_INTEL_EHL_SGMII2G5:
+	case PCI_DEVICE_ID_INTEL_EHL_PSE0_SGMII2G5:
+	case PCI_DEVICE_ID_INTEL_EHL_PSE0_SGMII1G:
+	case PCI_DEVICE_ID_INTEL_EHL_PSE1_SGMII1G:
+	case PCI_DEVICE_ID_INTEL_EHL_PSE1_SGMII2G5:
+		return PHY_INTERFACE_MODE_SGMII;
+	};
+
+	return PHY_INTERFACE_MODE_NA;
+}
+
+static struct eqos_ops eqos_intel_ops = {
+	.eqos_inval_desc = eqos_inval_desc_generic,
+	.eqos_flush_desc = eqos_flush_desc_generic,
+	.eqos_inval_buffer = eqos_inval_buffer_generic,
+	.eqos_flush_buffer = eqos_flush_buffer_generic,
+	.eqos_probe_resources =  eqos_probe_ressources_intel,
+	.eqos_remove_resources = eqos_null_ops,
+	.eqos_stop_resets = eqos_null_ops,
+	.eqos_start_resets = eqos_start_resets_intel,
+	.eqos_stop_clks = eqos_null_ops,
+	.eqos_start_clks = eqos_null_ops,
+	.eqos_calibrate_pads = eqos_null_ops,
+	.eqos_disable_calibration = eqos_null_ops,
+	.eqos_set_tx_clk_speed = eqos_null_ops,
+	.eqos_get_enetaddr = eqos_get_enetaddr_intel,
+	.eqos_get_tick_clk_rate = eqos_get_tick_clk_rate_intel,
+};
+
+struct eqos_config eqos_intel_config = {
+	.reg_access_always_ok = false,
+	.mdio_wait = 10,
+	.swr_wait = 50,
+	.config_mac = EQOS_MAC_RXQ_CTRL0_RXQ0EN_ENABLED_DCB,
+	.config_mac_mdio = EQOS_MAC_MDIO_ADDRESS_CR_250_300,
+	.axi_bus_width = EQOS_AXI_WIDTH_64,
+	.interface = eqos_get_interface_intel,
+	.ops = &eqos_intel_ops
+};
+
+extern U_BOOT_DRIVER(eth_eqos);
+U_BOOT_PCI_DEVICE(eth_eqos, intel_pci_ids);