--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * dwmac-imx.c - DWMAC Specific Glue layer for NXP imx8
+ *
+ * Copyright 2020 NXP
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/gpio/consumer.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_net.h>
+#include <linux/phy.h>
+#include <linux/platform_device.h>
+#include <linux/pm_wakeirq.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/stmmac.h>
+
+#include "stmmac_platform.h"
+
+#define GPR_ENET_QOS_INTF_MODE_MASK GENMASK(21, 16)
+#define GPR_ENET_QOS_INTF_SEL_MII (0x0 << 16)
+#define GPR_ENET_QOS_INTF_SEL_RMII (0x4 << 16)
+#define GPR_ENET_QOS_INTF_SEL_RGMII (0x1 << 16)
+#define GPR_ENET_QOS_CLK_GEN_EN (0x1 << 19)
+#define GPR_ENET_QOS_CLK_TX_CLK_SEL (0x1 << 20)
+#define GPR_ENET_QOS_RGMII_EN (0x1 << 21)
+
+struct imx_dwmac_ops {
+ u32 addr_width;
+ bool mac_rgmii_txclk_auto_adj;
+
+ int (*set_intf_mode)(struct plat_stmmacenet_data *plat_dat);
+};
+
+struct imx_priv_data {
+ struct device *dev;
+ struct clk *clk_tx;
+ struct clk *clk_mem;
+ struct regmap *intf_regmap;
+ u32 intf_reg_off;
+ bool rmii_refclk_ext;
+
+ const struct imx_dwmac_ops *ops;
+ struct plat_stmmacenet_data *plat_dat;
+};
+
+static int imx8mp_set_intf_mode(struct plat_stmmacenet_data *plat_dat)
+{
+ struct imx_priv_data *dwmac = plat_dat->bsp_priv;
+ int val;
+
+ switch (plat_dat->interface) {
+ case PHY_INTERFACE_MODE_MII:
+ val = GPR_ENET_QOS_INTF_SEL_MII;
+ break;
+ case PHY_INTERFACE_MODE_RMII:
+ val = GPR_ENET_QOS_INTF_SEL_RMII;
+ val |= (dwmac->rmii_refclk_ext ? 0 : GPR_ENET_QOS_CLK_TX_CLK_SEL);
+ break;
+ case PHY_INTERFACE_MODE_RGMII:
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ case PHY_INTERFACE_MODE_RGMII_RXID:
+ case PHY_INTERFACE_MODE_RGMII_TXID:
+ val = GPR_ENET_QOS_INTF_SEL_RGMII |
+ GPR_ENET_QOS_RGMII_EN;
+ break;
+ default:
+ pr_debug("imx dwmac doesn't support %d interface\n",
+ plat_dat->interface);
+ return -EINVAL;
+ }
+
+ val |= GPR_ENET_QOS_CLK_GEN_EN;
+ return regmap_update_bits(dwmac->intf_regmap, dwmac->intf_reg_off,
+ GPR_ENET_QOS_INTF_MODE_MASK, val);
+};
+
+static int
+imx8dxl_set_intf_mode(struct plat_stmmacenet_data *plat_dat)
+{
+ int ret = 0;
+
+ /* TBD: depends on imx8dxl scu interfaces to be upstreamed */
+ return ret;
+}
+
+static int imx_dwmac_init(struct platform_device *pdev, void *priv)
+{
+ struct plat_stmmacenet_data *plat_dat;
+ struct imx_priv_data *dwmac = priv;
+ int ret;
+
+ plat_dat = dwmac->plat_dat;
+
+ ret = clk_prepare_enable(dwmac->clk_mem);
+ if (ret) {
+ dev_err(&pdev->dev, "mem clock enable failed\n");
+ return ret;
+ }
+
+ ret = clk_prepare_enable(dwmac->clk_tx);
+ if (ret) {
+ dev_err(&pdev->dev, "tx clock enable failed\n");
+ goto clk_tx_en_failed;
+ }
+
+ if (dwmac->ops->set_intf_mode) {
+ ret = dwmac->ops->set_intf_mode(plat_dat);
+ if (ret)
+ goto intf_mode_failed;
+ }
+
+ return 0;
+
+intf_mode_failed:
+ clk_disable_unprepare(dwmac->clk_tx);
+clk_tx_en_failed:
+ clk_disable_unprepare(dwmac->clk_mem);
+ return ret;
+}
+
+static void imx_dwmac_exit(struct platform_device *pdev, void *priv)
+{
+ struct imx_priv_data *dwmac = priv;
+
+ if (dwmac->clk_tx)
+ clk_disable_unprepare(dwmac->clk_tx);
+ clk_disable_unprepare(dwmac->clk_mem);
+}
+
+static void imx_dwmac_fix_speed(void *priv, unsigned int speed)
+{
+ struct plat_stmmacenet_data *plat_dat;
+ struct imx_priv_data *dwmac = priv;
+ unsigned long rate;
+ int err;
+
+ plat_dat = dwmac->plat_dat;
+
+ if (dwmac->ops->mac_rgmii_txclk_auto_adj ||
+ (plat_dat->interface == PHY_INTERFACE_MODE_RMII) ||
+ (plat_dat->interface == PHY_INTERFACE_MODE_MII))
+ return;
+
+ switch (speed) {
+ case SPEED_1000:
+ rate = 125000000;
+ break;
+ case SPEED_100:
+ rate = 25000000;
+ break;
+ case SPEED_10:
+ rate = 2500000;
+ break;
+ default:
+ dev_err(dwmac->dev, "invalid speed %u\n", speed);
+ return;
+ }
+
+ err = clk_set_rate(dwmac->clk_tx, rate);
+ if (err < 0)
+ dev_err(dwmac->dev, "failed to set tx rate %lu\n", rate);
+}
+
+static int
+imx_dwmac_parse_dt(struct imx_priv_data *dwmac, struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ int err = 0;
+
+ if (of_get_property(np, "snps,rmii_refclk_ext", NULL))
+ dwmac->rmii_refclk_ext = true;
+
+ dwmac->clk_tx = devm_clk_get(dev, "tx");
+ if (IS_ERR(dwmac->clk_tx)) {
+ dev_err(dev, "failed to get tx clock\n");
+ return PTR_ERR(dwmac->clk_tx);
+ }
+
+ dwmac->clk_mem = NULL;
+ if (of_machine_is_compatible("fsl,imx8dxl")) {
+ dwmac->clk_mem = devm_clk_get(dev, "mem");
+ if (IS_ERR(dwmac->clk_mem)) {
+ dev_err(dev, "failed to get mem clock\n");
+ return PTR_ERR(dwmac->clk_mem);
+ }
+ }
+
+ if (of_machine_is_compatible("fsl,imx8mp")) {
+ /* Binding doc describes the propety:
+ is required by i.MX8MP.
+ is optinoal for i.MX8DXL.
+ */
+ dwmac->intf_regmap = syscon_regmap_lookup_by_phandle(np, "intf_mode");
+ if (IS_ERR(dwmac->intf_regmap))
+ return PTR_ERR(dwmac->intf_regmap);
+
+ err = of_property_read_u32_index(np, "intf_mode", 1, &dwmac->intf_reg_off);
+ if (err) {
+ dev_err(dev, "Can't get intf mode reg offset (%d)\n", err);
+ return err;
+ }
+ }
+
+ return err;
+}
+
+static int imx_dwmac_probe(struct platform_device *pdev)
+{
+ struct plat_stmmacenet_data *plat_dat;
+ struct stmmac_resources stmmac_res;
+ struct imx_priv_data *dwmac;
+ const struct imx_dwmac_ops *data;
+ int ret;
+
+ ret = stmmac_get_platform_resources(pdev, &stmmac_res);
+ if (ret)
+ return ret;
+
+ dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
+ if (!dwmac)
+ return PTR_ERR(dwmac);
+
+ plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+ if (IS_ERR(plat_dat))
+ return PTR_ERR(plat_dat);
+
+ data = of_device_get_match_data(&pdev->dev);
+ if (!data) {
+ dev_err(&pdev->dev, "failed to get match data\n");
+ ret = -EINVAL;
+ goto err_match_data;
+ }
+
+ dwmac->ops = data;
+ dwmac->dev = &pdev->dev;
+
+ ret = imx_dwmac_parse_dt(dwmac, &pdev->dev);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to parse OF data\n");
+ goto err_parse_dt;
+ }
+
+ ret = dma_set_mask_and_coherent(&pdev->dev,
+ DMA_BIT_MASK(dwmac->ops->addr_width));
+ if (ret) {
+ dev_err(&pdev->dev, "DMA mask set failed\n");
+ goto err_dma_mask;
+ }
+
+ plat_dat->init = imx_dwmac_init;
+ plat_dat->exit = imx_dwmac_exit;
+ plat_dat->fix_mac_speed = imx_dwmac_fix_speed;
+ plat_dat->bsp_priv = dwmac;
+ dwmac->plat_dat = plat_dat;
+
+ ret = imx_dwmac_init(pdev, dwmac);
+ if (ret)
+ goto err_dwmac_init;
+
+ ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
+ if (ret)
+ goto err_drv_probe;
+
+ return 0;
+
+err_dwmac_init:
+err_drv_probe:
+ imx_dwmac_exit(pdev, plat_dat->bsp_priv);
+err_dma_mask:
+err_parse_dt:
+err_match_data:
+ stmmac_remove_config_dt(pdev, plat_dat);
+ return ret;
+}
+
+static struct imx_dwmac_ops imx8mp_dwmac_data = {
+ .addr_width = 34,
+ .mac_rgmii_txclk_auto_adj = false,
+ .set_intf_mode = imx8mp_set_intf_mode,
+};
+
+static struct imx_dwmac_ops imx8dxl_dwmac_data = {
+ .addr_width = 32,
+ .mac_rgmii_txclk_auto_adj = true,
+ .set_intf_mode = imx8dxl_set_intf_mode,
+};
+
+static const struct of_device_id imx_dwmac_match[] = {
+ { .compatible = "nxp,imx8mp-dwmac-eqos", .data = &imx8mp_dwmac_data },
+ { .compatible = "nxp,imx8dxl-dwmac-eqos", .data = &imx8dxl_dwmac_data },
+ { }
+};
+MODULE_DEVICE_TABLE(of, imx_dwmac_match);
+
+static struct platform_driver imx_dwmac_driver = {
+ .probe = imx_dwmac_probe,
+ .remove = stmmac_pltfr_remove,
+ .driver = {
+ .name = "imx-dwmac",
+ .pm = &stmmac_pltfr_pm_ops,
+ .of_match_table = imx_dwmac_match,
+ },
+};
+module_platform_driver(imx_dwmac_driver);
+
+MODULE_AUTHOR("NXP");
+MODULE_DESCRIPTION("NXP imx8 DWMAC Specific Glue layer");
+MODULE_LICENSE("GPL v2");
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