--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Loongson-1 DWMAC glue layer
+ *
+ * Copyright (C) 2011-2023 Keguang Zhang <keguang.zhang@gmail.com>
+ */
+
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include "stmmac.h"
+#include "stmmac_platform.h"
+
+#define LS1B_GMAC0_BASE (0x1fe10000)
+#define LS1B_GMAC1_BASE (0x1fe20000)
+
+/* Loongson-1 SYSCON Registers */
+#define LS1X_SYSCON0 (0x0)
+#define LS1X_SYSCON1 (0x4)
+
+/* Loongson-1B SYSCON Register Bits */
+#define GMAC1_USE_UART1 BIT(4)
+#define GMAC1_USE_UART0 BIT(3)
+
+#define GMAC1_SHUT BIT(13)
+#define GMAC0_SHUT BIT(12)
+
+#define GMAC1_USE_TXCLK BIT(3)
+#define GMAC0_USE_TXCLK BIT(2)
+#define GMAC1_USE_PWM23 BIT(1)
+#define GMAC0_USE_PWM01 BIT(0)
+
+/* Loongson-1C SYSCON Register Bits */
+#define GMAC_SHUT BIT(6)
+
+#define PHY_INTF_SELI GENMASK(30, 28)
+#define PHY_INTF_MII FIELD_PREP(PHY_INTF_SELI, 0)
+#define PHY_INTF_RMII FIELD_PREP(PHY_INTF_SELI, 4)
+
+struct ls1x_dwmac {
+ struct plat_stmmacenet_data *plat_dat;
+ struct regmap *regmap;
+};
+
+static int ls1b_dwmac_syscon_init(struct platform_device *pdev, void *priv)
+{
+ struct ls1x_dwmac *dwmac = priv;
+ struct plat_stmmacenet_data *plat = dwmac->plat_dat;
+ struct regmap *regmap = dwmac->regmap;
+ struct resource *res;
+ unsigned long reg_base;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "Could not get IO_MEM resources\n");
+ return -EINVAL;
+ }
+ reg_base = (unsigned long)res->start;
+
+ if (reg_base == LS1B_GMAC0_BASE) {
+ switch (plat->phy_interface) {
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ regmap_update_bits(regmap, LS1X_SYSCON0,
+ GMAC0_USE_TXCLK | GMAC0_USE_PWM01,
+ 0);
+ break;
+ case PHY_INTERFACE_MODE_MII:
+ regmap_update_bits(regmap, LS1X_SYSCON0,
+ GMAC0_USE_TXCLK | GMAC0_USE_PWM01,
+ GMAC0_USE_TXCLK | GMAC0_USE_PWM01);
+ break;
+ default:
+ dev_err(&pdev->dev, "Unsupported PHY mode %u\n",
+ plat->phy_interface);
+ return -EOPNOTSUPP;
+ }
+
+ regmap_update_bits(regmap, LS1X_SYSCON0, GMAC0_SHUT, 0);
+ } else if (reg_base == LS1B_GMAC1_BASE) {
+ regmap_update_bits(regmap, LS1X_SYSCON0,
+ GMAC1_USE_UART1 | GMAC1_USE_UART0,
+ GMAC1_USE_UART1 | GMAC1_USE_UART0);
+
+ switch (plat->phy_interface) {
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ regmap_update_bits(regmap, LS1X_SYSCON1,
+ GMAC1_USE_TXCLK | GMAC1_USE_PWM23,
+ 0);
+
+ break;
+ case PHY_INTERFACE_MODE_MII:
+ regmap_update_bits(regmap, LS1X_SYSCON1,
+ GMAC1_USE_TXCLK | GMAC1_USE_PWM23,
+ GMAC1_USE_TXCLK | GMAC1_USE_PWM23);
+ break;
+ default:
+ dev_err(&pdev->dev, "Unsupported PHY mode %u\n",
+ plat->phy_interface);
+ return -EOPNOTSUPP;
+ }
+
+ regmap_update_bits(regmap, LS1X_SYSCON1, GMAC1_SHUT, 0);
+ } else {
+ dev_err(&pdev->dev, "Invalid Ethernet MAC base address %lx",
+ reg_base);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int ls1c_dwmac_syscon_init(struct platform_device *pdev, void *priv)
+{
+ struct ls1x_dwmac *dwmac = priv;
+ struct plat_stmmacenet_data *plat = dwmac->plat_dat;
+ struct regmap *regmap = dwmac->regmap;
+
+ switch (plat->phy_interface) {
+ case PHY_INTERFACE_MODE_MII:
+ regmap_update_bits(regmap, LS1X_SYSCON1, PHY_INTF_SELI,
+ PHY_INTF_MII);
+ break;
+ case PHY_INTERFACE_MODE_RMII:
+ regmap_update_bits(regmap, LS1X_SYSCON1, PHY_INTF_SELI,
+ PHY_INTF_RMII);
+ break;
+ default:
+ dev_err(&pdev->dev, "Unsupported PHY-mode %u\n",
+ plat->phy_interface);
+ return -EOPNOTSUPP;
+ }
+
+ regmap_update_bits(regmap, LS1X_SYSCON0, GMAC0_SHUT, 0);
+
+ return 0;
+}
+
+static int ls1x_dwmac_probe(struct platform_device *pdev)
+{
+ struct plat_stmmacenet_data *plat_dat;
+ struct stmmac_resources stmmac_res;
+ struct regmap *regmap;
+ struct ls1x_dwmac *dwmac;
+ int (*init)(struct platform_device *pdev, void *priv);
+ int ret;
+
+ ret = stmmac_get_platform_resources(pdev, &stmmac_res);
+ if (ret)
+ return ret;
+
+ /* Probe syscon */
+ regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
+ "loongson,ls1-syscon");
+ if (IS_ERR(regmap))
+ return dev_err_probe(&pdev->dev, PTR_ERR(regmap),
+ "Unable to find syscon\n");
+
+ init = of_device_get_match_data(&pdev->dev);
+ if (!init) {
+ dev_err(&pdev->dev, "No of match data provided\n");
+ return -EINVAL;
+ }
+
+ dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
+ if (!dwmac)
+ return -ENOMEM;
+
+ plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);
+ if (IS_ERR(plat_dat))
+ return dev_err_probe(&pdev->dev, PTR_ERR(plat_dat),
+ "dt configuration failed\n");
+
+ plat_dat->bsp_priv = dwmac;
+ plat_dat->init = init;
+ dwmac->plat_dat = plat_dat;
+ dwmac->regmap = regmap;
+
+ return devm_stmmac_pltfr_probe(pdev, plat_dat, &stmmac_res);
+}
+
+static const struct of_device_id ls1x_dwmac_match[] = {
+ {
+ .compatible = "loongson,ls1b-gmac",
+ .data = &ls1b_dwmac_syscon_init,
+ },
+ {
+ .compatible = "loongson,ls1c-emac",
+ .data = &ls1c_dwmac_syscon_init,
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ls1x_dwmac_match);
+
+static struct platform_driver ls1x_dwmac_driver = {
+ .probe = ls1x_dwmac_probe,
+ .driver = {
+ .name = "loongson1-dwmac",
+ .of_match_table = ls1x_dwmac_match,
+ },
+};
+module_platform_driver(ls1x_dwmac_driver);
+
+MODULE_AUTHOR("Keguang Zhang <keguang.zhang@gmail.com>");
+MODULE_DESCRIPTION("Loongson-1 DWMAC glue layer");
+MODULE_LICENSE("GPL");
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