--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * T-HEAD DWMAC platform driver
+ *
+ * Copyright (C) 2021 Alibaba Group Holding Limited.
+ * Copyright (C) 2023 Jisheng Zhang <jszhang@kernel.org>
+ *
+ */
+
+#include <linux/bitfield.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_net.h>
+#include <linux/platform_device.h>
+
+#include "stmmac_platform.h"
+
+#define GMAC_CLK_EN 0x00
+#define GMAC_TX_CLK_EN BIT(1)
+#define GMAC_TX_CLK_N_EN BIT(2)
+#define GMAC_TX_CLK_OUT_EN BIT(3)
+#define GMAC_RX_CLK_EN BIT(4)
+#define GMAC_RX_CLK_N_EN BIT(5)
+#define GMAC_EPHY_REF_CLK_EN BIT(6)
+#define GMAC_RXCLK_DELAY_CTRL 0x04
+#define GMAC_RXCLK_BYPASS BIT(15)
+#define GMAC_RXCLK_INVERT BIT(14)
+#define GMAC_RXCLK_DELAY GENMASK(4, 0)
+#define GMAC_TXCLK_DELAY_CTRL 0x08
+#define GMAC_TXCLK_BYPASS BIT(15)
+#define GMAC_TXCLK_INVERT BIT(14)
+#define GMAC_TXCLK_DELAY GENMASK(4, 0)
+#define GMAC_PLLCLK_DIV 0x0c
+#define GMAC_PLLCLK_DIV_EN BIT(31)
+#define GMAC_PLLCLK_DIV_NUM GENMASK(7, 0)
+#define GMAC_GTXCLK_SEL 0x18
+#define GMAC_GTXCLK_SEL_PLL BIT(0)
+#define GMAC_INTF_CTRL 0x1c
+#define PHY_INTF_MASK BIT(0)
+#define PHY_INTF_RGMII FIELD_PREP(PHY_INTF_MASK, 1)
+#define PHY_INTF_MII_GMII FIELD_PREP(PHY_INTF_MASK, 0)
+#define GMAC_TXCLK_OEN 0x20
+#define TXCLK_DIR_MASK BIT(0)
+#define TXCLK_DIR_OUTPUT FIELD_PREP(TXCLK_DIR_MASK, 0)
+#define TXCLK_DIR_INPUT FIELD_PREP(TXCLK_DIR_MASK, 1)
+
+#define GMAC_GMII_RGMII_RATE 125000000
+#define GMAC_MII_RATE 25000000
+
+struct thead_dwmac {
+ struct plat_stmmacenet_data *plat;
+ void __iomem *apb_base;
+ struct device *dev;
+};
+
+static int thead_dwmac_set_phy_if(struct plat_stmmacenet_data *plat)
+{
+ struct thead_dwmac *dwmac = plat->bsp_priv;
+ u32 phyif;
+
+ switch (plat->mac_interface) {
+ case PHY_INTERFACE_MODE_MII:
+ phyif = PHY_INTF_MII_GMII;
+ break;
+ case PHY_INTERFACE_MODE_RGMII:
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ case PHY_INTERFACE_MODE_RGMII_TXID:
+ case PHY_INTERFACE_MODE_RGMII_RXID:
+ phyif = PHY_INTF_RGMII;
+ break;
+ default:
+ dev_err(dwmac->dev, "unsupported phy interface %d\n",
+ plat->mac_interface);
+ return -EINVAL;
+ }
+
+ writel(phyif, dwmac->apb_base + GMAC_INTF_CTRL);
+ return 0;
+}
+
+static int thead_dwmac_set_txclk_dir(struct plat_stmmacenet_data *plat)
+{
+ struct thead_dwmac *dwmac = plat->bsp_priv;
+ u32 txclk_dir;
+
+ switch (plat->mac_interface) {
+ case PHY_INTERFACE_MODE_MII:
+ txclk_dir = TXCLK_DIR_INPUT;
+ break;
+ case PHY_INTERFACE_MODE_RGMII:
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ case PHY_INTERFACE_MODE_RGMII_TXID:
+ case PHY_INTERFACE_MODE_RGMII_RXID:
+ txclk_dir = TXCLK_DIR_OUTPUT;
+ break;
+ default:
+ dev_err(dwmac->dev, "unsupported phy interface %d\n",
+ plat->mac_interface);
+ return -EINVAL;
+ }
+
+ writel(txclk_dir, dwmac->apb_base + GMAC_TXCLK_OEN);
+ return 0;
+}
+
+static void thead_dwmac_fix_speed(void *priv, unsigned int speed, unsigned int mode)
+{
+ struct plat_stmmacenet_data *plat;
+ struct thead_dwmac *dwmac = priv;
+ unsigned long rate;
+ u32 div, reg;
+
+ plat = dwmac->plat;
+
+ switch (plat->mac_interface) {
+ /* For MII, rxc/txc is provided by phy */
+ case PHY_INTERFACE_MODE_MII:
+ return;
+
+ case PHY_INTERFACE_MODE_RGMII:
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ case PHY_INTERFACE_MODE_RGMII_RXID:
+ case PHY_INTERFACE_MODE_RGMII_TXID:
+ rate = clk_get_rate(plat->stmmac_clk);
+ if (!rate || rate % GMAC_GMII_RGMII_RATE != 0 ||
+ rate % GMAC_MII_RATE != 0) {
+ dev_err(dwmac->dev, "invalid gmac rate %ld\n", rate);
+ return;
+ }
+
+ writel(0, dwmac->apb_base + GMAC_PLLCLK_DIV);
+
+ switch (speed) {
+ case SPEED_1000:
+ div = rate / GMAC_GMII_RGMII_RATE;
+ break;
+ case SPEED_100:
+ div = rate / GMAC_MII_RATE;
+ break;
+ case SPEED_10:
+ div = rate * 10 / GMAC_MII_RATE;
+ break;
+ default:
+ dev_err(dwmac->dev, "invalid speed %u\n", speed);
+ return;
+ }
+
+ reg = FIELD_PREP(GMAC_PLLCLK_DIV_EN, 1) |
+ FIELD_PREP(GMAC_PLLCLK_DIV_NUM, div);
+ writel(reg, dwmac->apb_base + GMAC_PLLCLK_DIV);
+ break;
+ default:
+ dev_err(dwmac->dev, "unsupported phy interface %d\n",
+ plat->mac_interface);
+ return;
+ }
+}
+
+static int thead_dwmac_enable_clk(struct plat_stmmacenet_data *plat)
+{
+ struct thead_dwmac *dwmac = plat->bsp_priv;
+ u32 reg;
+
+ switch (plat->mac_interface) {
+ case PHY_INTERFACE_MODE_MII:
+ reg = GMAC_RX_CLK_EN | GMAC_TX_CLK_EN;
+ break;
+
+ case PHY_INTERFACE_MODE_RGMII:
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ case PHY_INTERFACE_MODE_RGMII_RXID:
+ case PHY_INTERFACE_MODE_RGMII_TXID:
+ /* use pll */
+ writel(GMAC_GTXCLK_SEL_PLL, dwmac->apb_base + GMAC_GTXCLK_SEL);
+ reg = GMAC_TX_CLK_EN | GMAC_TX_CLK_N_EN | GMAC_TX_CLK_OUT_EN |
+ GMAC_RX_CLK_EN | GMAC_RX_CLK_N_EN;
+ break;
+
+ default:
+ dev_err(dwmac->dev, "unsupported phy interface %d\n",
+ plat->mac_interface);
+ return -EINVAL;
+ }
+
+ writel(reg, dwmac->apb_base + GMAC_CLK_EN);
+ return 0;
+}
+
+static int thead_dwmac_init(struct platform_device *pdev, void *priv)
+{
+ struct thead_dwmac *dwmac = priv;
+ unsigned int reg;
+ int ret;
+
+ ret = thead_dwmac_set_phy_if(dwmac->plat);
+ if (ret)
+ return ret;
+
+ ret = thead_dwmac_set_txclk_dir(dwmac->plat);
+ if (ret)
+ return ret;
+
+ reg = readl(dwmac->apb_base + GMAC_RXCLK_DELAY_CTRL);
+ reg &= ~(GMAC_RXCLK_DELAY);
+ reg |= FIELD_PREP(GMAC_RXCLK_DELAY, 0);
+ writel(reg, dwmac->apb_base + GMAC_RXCLK_DELAY_CTRL);
+
+ reg = readl(dwmac->apb_base + GMAC_TXCLK_DELAY_CTRL);
+ reg &= ~(GMAC_TXCLK_DELAY);
+ reg |= FIELD_PREP(GMAC_TXCLK_DELAY, 0);
+ writel(reg, dwmac->apb_base + GMAC_TXCLK_DELAY_CTRL);
+
+ return thead_dwmac_enable_clk(dwmac->plat);
+}
+
+static int thead_dwmac_probe(struct platform_device *pdev)
+{
+ struct stmmac_resources stmmac_res;
+ struct plat_stmmacenet_data *plat;
+ struct thead_dwmac *dwmac;
+ void __iomem *apb;
+ int ret;
+
+ ret = stmmac_get_platform_resources(pdev, &stmmac_res);
+ if (ret)
+ return dev_err_probe(&pdev->dev, ret,
+ "failed to get resources\n");
+
+ plat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);
+ if (IS_ERR(plat))
+ return dev_err_probe(&pdev->dev, PTR_ERR(plat),
+ "dt configuration failed\n");
+
+ dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
+ if (!dwmac)
+ return -ENOMEM;
+
+ apb = devm_platform_ioremap_resource(pdev, 1);
+ if (IS_ERR(apb))
+ return dev_err_probe(&pdev->dev, PTR_ERR(apb),
+ "failed to remap gmac apb registers\n");
+
+ dwmac->dev = &pdev->dev;
+ dwmac->plat = plat;
+ dwmac->apb_base = apb;
+ plat->bsp_priv = dwmac;
+ plat->fix_mac_speed = thead_dwmac_fix_speed;
+ plat->init = thead_dwmac_init;
+
+ return devm_stmmac_pltfr_probe(pdev, plat, &stmmac_res);
+}
+
+static const struct of_device_id thead_dwmac_match[] = {
+ { .compatible = "thead,th1520-gmac" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, thead_dwmac_match);
+
+static struct platform_driver thead_dwmac_driver = {
+ .probe = thead_dwmac_probe,
+ .driver = {
+ .name = "thead-dwmac",
+ .pm = &stmmac_pltfr_pm_ops,
+ .of_match_table = thead_dwmac_match,
+ },
+};
+module_platform_driver(thead_dwmac_driver);
+
+MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
+MODULE_AUTHOR("Drew Fustini <drew@pdp7.com>");
+MODULE_DESCRIPTION("T-HEAD DWMAC platform driver");
+MODULE_LICENSE("GPL");
projects / linux-block.git / commitdiff