1 files changed, 536 insertions, 0 deletions

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
new file mode 100644
index 000000000..142bf9120
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
@@ -0,0 +1,536 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright Altera Corporation (C) 2014. All rights reserved.
+ *
+ * Adopted from dwmac-sti.c
+ */
+
+#include <linux/mfd/altera-sysmgr.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_net.h>
+#include <linux/phy.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <linux/stmmac.h>
+
+#include "stmmac.h"
+#include "stmmac_platform.h"
+
+#include "altr_tse_pcs.h"
+
+#define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII 0x0
+#define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RGMII 0x1
+#define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RMII 0x2
+#define SYSMGR_EMACGRP_CTRL_PHYSEL_WIDTH 2
+#define SYSMGR_EMACGRP_CTRL_PHYSEL_MASK 0x00000003
+#define SYSMGR_EMACGRP_CTRL_PTP_REF_CLK_MASK 0x00000010
+#define SYSMGR_GEN10_EMACGRP_CTRL_PTP_REF_CLK_MASK 0x00000100
+
+#define SYSMGR_FPGAGRP_MODULE_REG  0x00000028
+#define SYSMGR_FPGAGRP_MODULE_EMAC 0x00000004
+#define SYSMGR_FPGAINTF_EMAC_REG	0x00000070
+#define SYSMGR_FPGAINTF_EMAC_BIT	0x1
+
+#define EMAC_SPLITTER_CTRL_REG			0x0
+#define EMAC_SPLITTER_CTRL_SPEED_MASK		0x3
+#define EMAC_SPLITTER_CTRL_SPEED_10		0x2
+#define EMAC_SPLITTER_CTRL_SPEED_100		0x3
+#define EMAC_SPLITTER_CTRL_SPEED_1000		0x0
+
+struct socfpga_dwmac;
+struct socfpga_dwmac_ops {
+	int (*set_phy_mode)(struct socfpga_dwmac *dwmac_priv);
+};
+
+struct socfpga_dwmac {
+	u32	reg_offset;
+	u32	reg_shift;
+	struct	device *dev;
+	struct regmap *sys_mgr_base_addr;
+	struct reset_control *stmmac_rst;
+	struct reset_control *stmmac_ocp_rst;
+	void __iomem *splitter_base;
+	bool f2h_ptp_ref_clk;
+	struct tse_pcs pcs;
+	const struct socfpga_dwmac_ops *ops;
+};
+
+static void socfpga_dwmac_fix_mac_speed(void *priv, unsigned int speed)
+{
+	struct socfpga_dwmac *dwmac = (struct socfpga_dwmac *)priv;
+	void __iomem *splitter_base = dwmac->splitter_base;
+	void __iomem *sgmii_adapter_base = dwmac->pcs.sgmii_adapter_base;
+	struct device *dev = dwmac->dev;
+	struct net_device *ndev = dev_get_drvdata(dev);
+	struct phy_device *phy_dev = ndev->phydev;
+	u32 val;
+
+	if (sgmii_adapter_base)
+		writew(SGMII_ADAPTER_DISABLE,
+		       sgmii_adapter_base + SGMII_ADAPTER_CTRL_REG);
+
+	if (splitter_base) {
+		val = readl(splitter_base + EMAC_SPLITTER_CTRL_REG);
+		val &= ~EMAC_SPLITTER_CTRL_SPEED_MASK;
+
+		switch (speed) {
+		case 1000:
+			val |= EMAC_SPLITTER_CTRL_SPEED_1000;
+			break;
+		case 100:
+			val |= EMAC_SPLITTER_CTRL_SPEED_100;
+			break;
+		case 10:
+			val |= EMAC_SPLITTER_CTRL_SPEED_10;
+			break;
+		default:
+			return;
+		}
+		writel(val, splitter_base + EMAC_SPLITTER_CTRL_REG);
+	}
+
+	if (phy_dev && sgmii_adapter_base) {
+		writew(SGMII_ADAPTER_ENABLE,
+		       sgmii_adapter_base + SGMII_ADAPTER_CTRL_REG);
+		tse_pcs_fix_mac_speed(&dwmac->pcs, phy_dev, speed);
+	}
+}
+
+static int socfpga_dwmac_parse_data(struct socfpga_dwmac *dwmac, struct device *dev)
+{
+	struct device_node *np = dev->of_node;
+	struct regmap *sys_mgr_base_addr;
+	u32 reg_offset, reg_shift;
+	int ret, index;
+	struct device_node *np_splitter = NULL;
+	struct device_node *np_sgmii_adapter = NULL;
+	struct resource res_splitter;
+	struct resource res_tse_pcs;
+	struct resource res_sgmii_adapter;
+
+	sys_mgr_base_addr =
+		altr_sysmgr_regmap_lookup_by_phandle(np, "altr,sysmgr-syscon");
+	if (IS_ERR(sys_mgr_base_addr)) {
+		dev_info(dev, "No sysmgr-syscon node found\n");
+		return PTR_ERR(sys_mgr_base_addr);
+	}
+
+	ret = of_property_read_u32_index(np, "altr,sysmgr-syscon", 1, &reg_offset);
+	if (ret) {
+		dev_info(dev, "Could not read reg_offset from sysmgr-syscon!\n");
+		return -EINVAL;
+	}
+
+	ret = of_property_read_u32_index(np, "altr,sysmgr-syscon", 2, &reg_shift);
+	if (ret) {
+		dev_info(dev, "Could not read reg_shift from sysmgr-syscon!\n");
+		return -EINVAL;
+	}
+
+	dwmac->f2h_ptp_ref_clk = of_property_read_bool(np, "altr,f2h_ptp_ref_clk");
+
+	np_splitter = of_parse_phandle(np, "altr,emac-splitter", 0);
+	if (np_splitter) {
+		ret = of_address_to_resource(np_splitter, 0, &res_splitter);
+		of_node_put(np_splitter);
+		if (ret) {
+			dev_info(dev, "Missing emac splitter address\n");
+			return -EINVAL;
+		}
+
+		dwmac->splitter_base = devm_ioremap_resource(dev, &res_splitter);
+		if (IS_ERR(dwmac->splitter_base)) {
+			dev_info(dev, "Failed to mapping emac splitter\n");
+			return PTR_ERR(dwmac->splitter_base);
+		}
+	}
+
+	np_sgmii_adapter = of_parse_phandle(np,
+					    "altr,gmii-to-sgmii-converter", 0);
+	if (np_sgmii_adapter) {
+		index = of_property_match_string(np_sgmii_adapter, "reg-names",
+						 "hps_emac_interface_splitter_avalon_slave");
+
+		if (index >= 0) {
+			if (of_address_to_resource(np_sgmii_adapter, index,
+						   &res_splitter)) {
+				dev_err(dev,
+					"%s: ERROR: missing emac splitter address\n",
+					__func__);
+				ret = -EINVAL;
+				goto err_node_put;
+			}
+
+			dwmac->splitter_base =
+			    devm_ioremap_resource(dev, &res_splitter);
+
+			if (IS_ERR(dwmac->splitter_base)) {
+				ret = PTR_ERR(dwmac->splitter_base);
+				goto err_node_put;
+			}
+		}
+
+		index = of_property_match_string(np_sgmii_adapter, "reg-names",
+						 "gmii_to_sgmii_adapter_avalon_slave");
+
+		if (index >= 0) {
+			if (of_address_to_resource(np_sgmii_adapter, index,
+						   &res_sgmii_adapter)) {
+				dev_err(dev,
+					"%s: ERROR: failed mapping adapter\n",
+					__func__);
+				ret = -EINVAL;
+				goto err_node_put;
+			}
+
+			dwmac->pcs.sgmii_adapter_base =
+			    devm_ioremap_resource(dev, &res_sgmii_adapter);
+
+			if (IS_ERR(dwmac->pcs.sgmii_adapter_base)) {
+				ret = PTR_ERR(dwmac->pcs.sgmii_adapter_base);
+				goto err_node_put;
+			}
+		}
+
+		index = of_property_match_string(np_sgmii_adapter, "reg-names",
+						 "eth_tse_control_port");
+
+		if (index >= 0) {
+			if (of_address_to_resource(np_sgmii_adapter, index,
+						   &res_tse_pcs)) {
+				dev_err(dev,
+					"%s: ERROR: failed mapping tse control port\n",
+					__func__);
+				ret = -EINVAL;
+				goto err_node_put;
+			}
+
+			dwmac->pcs.tse_pcs_base =
+			    devm_ioremap_resource(dev, &res_tse_pcs);
+
+			if (IS_ERR(dwmac->pcs.tse_pcs_base)) {
+				ret = PTR_ERR(dwmac->pcs.tse_pcs_base);
+				goto err_node_put;
+			}
+		}
+	}
+	dwmac->reg_offset = reg_offset;
+	dwmac->reg_shift = reg_shift;
+	dwmac->sys_mgr_base_addr = sys_mgr_base_addr;
+	dwmac->dev = dev;
+	of_node_put(np_sgmii_adapter);
+
+	return 0;
+
+err_node_put:
+	of_node_put(np_sgmii_adapter);
+	return ret;
+}
+
+static int socfpga_get_plat_phymode(struct socfpga_dwmac *dwmac)
+{
+	struct net_device *ndev = dev_get_drvdata(dwmac->dev);
+	struct stmmac_priv *priv = netdev_priv(ndev);
+
+	return priv->plat->interface;
+}
+
+static int socfpga_set_phy_mode_common(int phymode, u32 *val)
+{
+	switch (phymode) {
+	case PHY_INTERFACE_MODE_RGMII:
+	case PHY_INTERFACE_MODE_RGMII_ID:
+	case PHY_INTERFACE_MODE_RGMII_RXID:
+	case PHY_INTERFACE_MODE_RGMII_TXID:
+		*val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RGMII;
+		break;
+	case PHY_INTERFACE_MODE_MII:
+	case PHY_INTERFACE_MODE_GMII:
+	case PHY_INTERFACE_MODE_SGMII:
+		*val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII;
+		break;
+	case PHY_INTERFACE_MODE_RMII:
+		*val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RMII;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int socfpga_gen5_set_phy_mode(struct socfpga_dwmac *dwmac)
+{
+	struct regmap *sys_mgr_base_addr = dwmac->sys_mgr_base_addr;
+	int phymode = socfpga_get_plat_phymode(dwmac);
+	u32 reg_offset = dwmac->reg_offset;
+	u32 reg_shift = dwmac->reg_shift;
+	u32 ctrl, val, module;
+
+	if (socfpga_set_phy_mode_common(phymode, &val)) {
+		dev_err(dwmac->dev, "bad phy mode %d\n", phymode);
+		return -EINVAL;
+	}
+
+	/* Overwrite val to GMII if splitter core is enabled. The phymode here
+	 * is the actual phy mode on phy hardware, but phy interface from
+	 * EMAC core is GMII.
+	 */
+	if (dwmac->splitter_base)
+		val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII;
+
+	/* Assert reset to the enet controller before changing the phy mode */
+	reset_control_assert(dwmac->stmmac_ocp_rst);
+	reset_control_assert(dwmac->stmmac_rst);
+
+	regmap_read(sys_mgr_base_addr, reg_offset, &ctrl);
+	ctrl &= ~(SYSMGR_EMACGRP_CTRL_PHYSEL_MASK << reg_shift);
+	ctrl |= val << reg_shift;
+
+	if (dwmac->f2h_ptp_ref_clk ||
+	    phymode == PHY_INTERFACE_MODE_MII ||
+	    phymode == PHY_INTERFACE_MODE_GMII ||
+	    phymode == PHY_INTERFACE_MODE_SGMII) {
+		regmap_read(sys_mgr_base_addr, SYSMGR_FPGAGRP_MODULE_REG,
+			    &module);
+		module |= (SYSMGR_FPGAGRP_MODULE_EMAC << (reg_shift / 2));
+		regmap_write(sys_mgr_base_addr, SYSMGR_FPGAGRP_MODULE_REG,
+			     module);
+	}
+
+	if (dwmac->f2h_ptp_ref_clk)
+		ctrl |= SYSMGR_EMACGRP_CTRL_PTP_REF_CLK_MASK << (reg_shift / 2);
+	else
+		ctrl &= ~(SYSMGR_EMACGRP_CTRL_PTP_REF_CLK_MASK <<
+			  (reg_shift / 2));
+
+	regmap_write(sys_mgr_base_addr, reg_offset, ctrl);
+
+	/* Deassert reset for the phy configuration to be sampled by
+	 * the enet controller, and operation to start in requested mode
+	 */
+	reset_control_deassert(dwmac->stmmac_ocp_rst);
+	reset_control_deassert(dwmac->stmmac_rst);
+	if (phymode == PHY_INTERFACE_MODE_SGMII) {
+		if (tse_pcs_init(dwmac->pcs.tse_pcs_base, &dwmac->pcs) != 0) {
+			dev_err(dwmac->dev, "Unable to initialize TSE PCS");
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+static int socfpga_gen10_set_phy_mode(struct socfpga_dwmac *dwmac)
+{
+	struct regmap *sys_mgr_base_addr = dwmac->sys_mgr_base_addr;
+	int phymode = socfpga_get_plat_phymode(dwmac);
+	u32 reg_offset = dwmac->reg_offset;
+	u32 reg_shift = dwmac->reg_shift;
+	u32 ctrl, val, module;
+
+	if (socfpga_set_phy_mode_common(phymode, &val))
+		return -EINVAL;
+
+	/* Overwrite val to GMII if splitter core is enabled. The phymode here
+	 * is the actual phy mode on phy hardware, but phy interface from
+	 * EMAC core is GMII.
+	 */
+	if (dwmac->splitter_base)
+		val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII;
+
+	/* Assert reset to the enet controller before changing the phy mode */
+	reset_control_assert(dwmac->stmmac_ocp_rst);
+	reset_control_assert(dwmac->stmmac_rst);
+
+	regmap_read(sys_mgr_base_addr, reg_offset, &ctrl);
+	ctrl &= ~(SYSMGR_EMACGRP_CTRL_PHYSEL_MASK);
+	ctrl |= val;
+
+	if (dwmac->f2h_ptp_ref_clk ||
+	    phymode == PHY_INTERFACE_MODE_MII ||
+	    phymode == PHY_INTERFACE_MODE_GMII ||
+	    phymode == PHY_INTERFACE_MODE_SGMII) {
+		ctrl |= SYSMGR_GEN10_EMACGRP_CTRL_PTP_REF_CLK_MASK;
+		regmap_read(sys_mgr_base_addr, SYSMGR_FPGAINTF_EMAC_REG,
+			    &module);
+		module |= (SYSMGR_FPGAINTF_EMAC_BIT << reg_shift);
+		regmap_write(sys_mgr_base_addr, SYSMGR_FPGAINTF_EMAC_REG,
+			     module);
+	} else {
+		ctrl &= ~SYSMGR_GEN10_EMACGRP_CTRL_PTP_REF_CLK_MASK;
+	}
+
+	regmap_write(sys_mgr_base_addr, reg_offset, ctrl);
+
+	/* Deassert reset for the phy configuration to be sampled by
+	 * the enet controller, and operation to start in requested mode
+	 */
+	reset_control_deassert(dwmac->stmmac_ocp_rst);
+	reset_control_deassert(dwmac->stmmac_rst);
+	if (phymode == PHY_INTERFACE_MODE_SGMII) {
+		if (tse_pcs_init(dwmac->pcs.tse_pcs_base, &dwmac->pcs) != 0) {
+			dev_err(dwmac->dev, "Unable to initialize TSE PCS");
+			return -EINVAL;
+		}
+	}
+	return 0;
+}
+
+static int socfpga_dwmac_probe(struct platform_device *pdev)
+{
+	struct plat_stmmacenet_data *plat_dat;
+	struct stmmac_resources stmmac_res;
+	struct device		*dev = &pdev->dev;
+	int			ret;
+	struct socfpga_dwmac	*dwmac;
+	struct net_device	*ndev;
+	struct stmmac_priv	*stpriv;
+	const struct socfpga_dwmac_ops *ops;
+
+	ops = device_get_match_data(&pdev->dev);
+	if (!ops) {
+		dev_err(&pdev->dev, "no of match data provided\n");
+		return -EINVAL;
+	}
+
+	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
+	if (ret)
+		return ret;
+
+	plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+	if (IS_ERR(plat_dat))
+		return PTR_ERR(plat_dat);
+
+	dwmac = devm_kzalloc(dev, sizeof(*dwmac), GFP_KERNEL);
+	if (!dwmac) {
+		ret = -ENOMEM;
+		goto err_remove_config_dt;
+	}
+
+	dwmac->stmmac_ocp_rst = devm_reset_control_get_optional(dev, "stmmaceth-ocp");
+	if (IS_ERR(dwmac->stmmac_ocp_rst)) {
+		ret = PTR_ERR(dwmac->stmmac_ocp_rst);
+		dev_err(dev, "error getting reset control of ocp %d\n", ret);
+		goto err_remove_config_dt;
+	}
+
+	reset_control_deassert(dwmac->stmmac_ocp_rst);
+
+	ret = socfpga_dwmac_parse_data(dwmac, dev);
+	if (ret) {
+		dev_err(dev, "Unable to parse OF data\n");
+		goto err_remove_config_dt;
+	}
+
+	dwmac->ops = ops;
+	plat_dat->bsp_priv = dwmac;
+	plat_dat->fix_mac_speed = socfpga_dwmac_fix_mac_speed;
+
+	ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
+	if (ret)
+		goto err_remove_config_dt;
+
+	ndev = platform_get_drvdata(pdev);
+	stpriv = netdev_priv(ndev);
+
+	/* The socfpga driver needs to control the stmmac reset to set the phy
+	 * mode. Create a copy of the core reset handle so it can be used by
+	 * the driver later.
+	 */
+	dwmac->stmmac_rst = stpriv->plat->stmmac_rst;
+
+	ret = ops->set_phy_mode(dwmac);
+	if (ret)
+		goto err_dvr_remove;
+
+	return 0;
+
+err_dvr_remove:
+	stmmac_dvr_remove(&pdev->dev);
+err_remove_config_dt:
+	stmmac_remove_config_dt(pdev, plat_dat);
+
+	return ret;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int socfpga_dwmac_resume(struct device *dev)
+{
+	struct net_device *ndev = dev_get_drvdata(dev);
+	struct stmmac_priv *priv = netdev_priv(ndev);
+	struct socfpga_dwmac *dwmac_priv = get_stmmac_bsp_priv(dev);
+
+	dwmac_priv->ops->set_phy_mode(priv->plat->bsp_priv);
+
+	/* Before the enet controller is suspended, the phy is suspended.
+	 * This causes the phy clock to be gated. The enet controller is
+	 * resumed before the phy, so the clock is still gated "off" when
+	 * the enet controller is resumed. This code makes sure the phy
+	 * is "resumed" before reinitializing the enet controller since
+	 * the enet controller depends on an active phy clock to complete
+	 * a DMA reset. A DMA reset will "time out" if executed
+	 * with no phy clock input on the Synopsys enet controller.
+	 * Verified through Synopsys Case #8000711656.
+	 *
+	 * Note that the phy clock is also gated when the phy is isolated.
+	 * Phy "suspend" and "isolate" controls are located in phy basic
+	 * control register 0, and can be modified by the phy driver
+	 * framework.
+	 */
+	if (ndev->phydev)
+		phy_resume(ndev->phydev);
+
+	return stmmac_resume(dev);
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static int __maybe_unused socfpga_dwmac_runtime_suspend(struct device *dev)
+{
+	struct net_device *ndev = dev_get_drvdata(dev);
+	struct stmmac_priv *priv = netdev_priv(ndev);
+
+	stmmac_bus_clks_config(priv, false);
+
+	return 0;
+}
+
+static int __maybe_unused socfpga_dwmac_runtime_resume(struct device *dev)
+{
+	struct net_device *ndev = dev_get_drvdata(dev);
+	struct stmmac_priv *priv = netdev_priv(ndev);
+
+	return stmmac_bus_clks_config(priv, true);
+}
+
+static const struct dev_pm_ops socfpga_dwmac_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(stmmac_suspend, socfpga_dwmac_resume)
+	SET_RUNTIME_PM_OPS(socfpga_dwmac_runtime_suspend, socfpga_dwmac_runtime_resume, NULL)
+};
+
+static const struct socfpga_dwmac_ops socfpga_gen5_ops = {
+	.set_phy_mode = socfpga_gen5_set_phy_mode,
+};
+
+static const struct socfpga_dwmac_ops socfpga_gen10_ops = {
+	.set_phy_mode = socfpga_gen10_set_phy_mode,
+};
+
+static const struct of_device_id socfpga_dwmac_match[] = {
+	{ .compatible = "altr,socfpga-stmmac", .data = &socfpga_gen5_ops },
+	{ .compatible = "altr,socfpga-stmmac-a10-s10", .data = &socfpga_gen10_ops },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, socfpga_dwmac_match);
+
+static struct platform_driver socfpga_dwmac_driver = {
+	.probe  = socfpga_dwmac_probe,
+	.remove = stmmac_pltfr_remove,
+	.driver = {
+		.name           = "socfpga-dwmac",
+		.pm		= &socfpga_dwmac_pm_ops,
+		.of_match_table = socfpga_dwmac_match,
+	},
+};
+module_platform_driver(socfpga_dwmac_driver);
+
+MODULE_LICENSE("GPL v2");