drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c
Extension
.c
Size
5334 bytes
Lines
183
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct starfive_dwmac_data {
	unsigned int gtxclk_dlychain;
};

struct starfive_dwmac {
	struct device *dev;
	const struct starfive_dwmac_data *data;
	struct clk *sgmii_rx;
};

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];
	int phy_intf_sel;
	int err;

	phy_intf_sel = stmmac_get_phy_intf_sel(plat_dat->phy_interface);
	if (phy_intf_sel != PHY_INTF_SEL_RGMII &&
	    phy_intf_sel != PHY_INTF_SEL_RMII) {
		dev_err(dwmac->dev, "unsupported interface %s\n",
			phy_modes(plat_dat->phy_interface));
		return phy_intf_sel < 0 ? phy_intf_sel : -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],
				 phy_intf_sel << args[1]);
	if (err)
		return dev_err_probe(dwmac->dev, err, "error setting phy mode\n");

	if (dwmac->data) {
		err = regmap_write(regmap, JH7100_SYSMAIN_REGISTER49_DLYCHAIN,
				   dwmac->data->gtxclk_dlychain);
		if (err)
			return dev_err_probe(dwmac->dev, err,
					     "error selecting gtxclk delay chain\n");
	}

	return 0;
}

static int stmmac_starfive_sgmii_set_clk_rate(void *bsp_priv, struct clk *clk_tx_i,
					      phy_interface_t __maybe_unused interface,
					      int speed)
{
	struct starfive_dwmac *dwmac = bsp_priv;
	long rate = rgmii_clock(speed);
	int ret;

	/* MAC clock rate the same as RGMII */
	if (rate < 0)
		return -EINVAL;

	ret = clk_set_rate(clk_tx_i, rate);
	if (ret)
		return ret;

	return clk_set_rate(dwmac->sgmii_rx, rate);
}

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 = 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");

	dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
	if (!dwmac)
		return -ENOMEM;

Annotation

Implementation Notes