diff options
Diffstat (limited to 'drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c')
| -rw-r--r-- | drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c new file mode 100644 index 000000000000..4f51a7889642 --- /dev/null +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c @@ -0,0 +1,171 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * StarFive DWMAC platform driver + * + * Copyright (C) 2021 Emil Renner Berthing <kernel@esmil.dk> + * Copyright (C) 2022 StarFive Technology Co., Ltd. + * + */ + +#include <linux/mfd/syscon.h> +#include <linux/of_device.h> +#include <linux/regmap.h> + +#include "stmmac_platform.h" + +#define STARFIVE_DWMAC_PHY_INFT_RGMII 0x1 +#define STARFIVE_DWMAC_PHY_INFT_RMII 0x4 +#define STARFIVE_DWMAC_PHY_INFT_FIELD 0x7U + +struct starfive_dwmac { + struct device *dev; + struct clk *clk_tx; +}; + +static void starfive_dwmac_fix_mac_speed(void *priv, unsigned int speed) +{ + struct starfive_dwmac *dwmac = priv; + unsigned long rate; + int err; + + rate = clk_get_rate(dwmac->clk_tx); + + 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); + break; + } + + err = clk_set_rate(dwmac->clk_tx, rate); + if (err) + dev_err(dwmac->dev, "failed to set tx rate %lu\n", rate); +} + +static int starfive_dwmac_set_mode(struct plat_stmmacenet_data *plat_dat) +{ + struct starfive_dwmac *dwmac = plat_dat->bsp_priv; + struct regmap *regmap; + unsigned int args[2]; + unsigned int mode; + int err; + + switch (plat_dat->interface) { + case PHY_INTERFACE_MODE_RMII: + mode = STARFIVE_DWMAC_PHY_INFT_RMII; + break; + + case PHY_INTERFACE_MODE_RGMII: + case PHY_INTERFACE_MODE_RGMII_ID: + mode = STARFIVE_DWMAC_PHY_INFT_RGMII; + break; + + default: + dev_err(dwmac->dev, "unsupported interface %d\n", + plat_dat->interface); + return -EINVAL; + } + + regmap = syscon_regmap_lookup_by_phandle_args(dwmac->dev->of_node, + "starfive,syscon", + 2, args); + if (IS_ERR(regmap)) + return dev_err_probe(dwmac->dev, PTR_ERR(regmap), "getting the regmap failed\n"); + + /* args[0]:offset args[1]: shift */ + err = regmap_update_bits(regmap, args[0], + STARFIVE_DWMAC_PHY_INFT_FIELD << args[1], + mode << args[1]); + if (err) + return dev_err_probe(dwmac->dev, err, "error setting phy mode\n"); + + return 0; +} + +static int starfive_dwmac_probe(struct platform_device *pdev) +{ + struct plat_stmmacenet_data *plat_dat; + struct stmmac_resources stmmac_res; + struct starfive_dwmac *dwmac; + struct clk *clk_gtx; + int err; + + err = stmmac_get_platform_resources(pdev, &stmmac_res); + if (err) + return dev_err_probe(&pdev->dev, err, + "failed to get resources\n"); + + plat_dat = 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"); + + dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL); + if (!dwmac) + return -ENOMEM; + + dwmac->clk_tx = devm_clk_get_enabled(&pdev->dev, "tx"); + if (IS_ERR(dwmac->clk_tx)) + return dev_err_probe(&pdev->dev, PTR_ERR(dwmac->clk_tx), + "error getting tx clock\n"); + + clk_gtx = devm_clk_get_enabled(&pdev->dev, "gtx"); + if (IS_ERR(clk_gtx)) + return dev_err_probe(&pdev->dev, PTR_ERR(clk_gtx), + "error getting gtx clock\n"); + + /* Generally, the rgmii_tx clock is provided by the internal clock, + * which needs to match the corresponding clock frequency according + * to different speeds. If the rgmii_tx clock is provided by the + * external rgmii_rxin, there is no need to configure the clock + * internally, because rgmii_rxin will be adaptively adjusted. + */ + if (!device_property_read_bool(&pdev->dev, "starfive,tx-use-rgmii-clk")) + plat_dat->fix_mac_speed = starfive_dwmac_fix_mac_speed; + + dwmac->dev = &pdev->dev; + plat_dat->bsp_priv = dwmac; + plat_dat->dma_cfg->dche = true; + + err = starfive_dwmac_set_mode(plat_dat); + if (err) + return err; + + err = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res); + if (err) { + stmmac_remove_config_dt(pdev, plat_dat); + return err; + } + + return 0; +} + +static const struct of_device_id starfive_dwmac_match[] = { + { .compatible = "starfive,jh7110-dwmac" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, starfive_dwmac_match); + +static struct platform_driver starfive_dwmac_driver = { + .probe = starfive_dwmac_probe, + .remove = stmmac_pltfr_remove, + .driver = { + .name = "starfive-dwmac", + .pm = &stmmac_pltfr_pm_ops, + .of_match_table = starfive_dwmac_match, + }, +}; +module_platform_driver(starfive_dwmac_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("StarFive DWMAC platform driver"); +MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>"); +MODULE_AUTHOR("Samin Guo <samin.guo@starfivetech.com>"); |