diff options
Diffstat (limited to 'drivers/net/designware_starfive.c')
| -rw-r--r-- | drivers/net/designware_starfive.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/drivers/net/designware_starfive.c b/drivers/net/designware_starfive.c new file mode 100644 index 0000000000..aff2cc10e1 --- /dev/null +++ b/drivers/net/designware_starfive.c @@ -0,0 +1,113 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2021 Ahmad Fatoum, Pengutronix + */ + +#include <common.h> +#include <init.h> +#include <linux/reset.h> +#include <linux/regmap.h> +#include <linux/clk.h> +#include <mfd/syscon.h> +#include <soc/starfive/sysmain.h> +#include "designware.h" + +/* + * GMAC_GTXCLK + * bit name access default description + * [31] _gmac_gtxclk enable RW 0x0 "1:enable; 0:disable" + * [30] reserved - 0x0 reserved + * [29:8] reserved - 0x0 reserved + * [7:0] gmac_gtxclk ratio RW 0x4 divider value + * + * 1000M: gtxclk@125M => 500/125 = 0x4 + * 100M: gtxclk@25M => 500/25 = 0x14 + * 10M: gtxclk@2.5M => 500/2.5 = 0xc8 + */ + +#define CLKGEN_BASE 0x11800000 +#define CLKGEN_GMAC_GTXCLK_OFFSET 0x1EC +#define CLKGEN_GMAC_GTXCLK_ADDR (CLKGEN_BASE + CLKGEN_GMAC_GTXCLK_OFFSET) + + +#define CLKGEN_125M_DIV 0x4 +#define CLKGEN_25M_DIV 0x14 +#define CLKGEN_2_5M_DIV 0xc8 + +static void dwmac_fixed_speed(int speed) +{ + /* TODO: move this into clk driver */ + void __iomem *addr = IOMEM(CLKGEN_GMAC_GTXCLK_ADDR); + u32 value; + + value = readl(addr) & (~0x000000FF); + + switch (speed) { + case SPEED_1000: value |= CLKGEN_125M_DIV; break; + case SPEED_100: value |= CLKGEN_25M_DIV; break; + case SPEED_10: value |= CLKGEN_2_5M_DIV; break; + default: return; + } + + writel(value, addr); +} + +static struct dw_eth_drvdata starfive_drvdata = { + .enh_desc = 1, + .fix_mac_speed = dwmac_fixed_speed, +}; + +static int starfive_dwc_ether_probe(struct device *dev) +{ + struct dw_eth_dev *dwc; + struct regmap *regmap; + int ret; + struct clk_bulk_data clks[] = { + { .id = "stmmaceth" }, + { .id = "ptp_ref" }, + { .id = "tx" }, + }; + + regmap = syscon_regmap_lookup_by_phandle(dev->of_node, + "starfive,sysmain"); + if (IS_ERR(regmap)) { + dev_err(dev, "Could not get starfive,sysmain node\n"); + return PTR_ERR(regmap); + } + + ret = clk_bulk_get(dev, ARRAY_SIZE(clks), clks); + if (ret) + return ret; + + ret = clk_bulk_enable(ARRAY_SIZE(clks), clks); + if (ret < 0) + return ret; + + ret = device_reset(dev); + if (ret) + return ret; + + dwc = dwc_drv_probe(dev); + if (IS_ERR(dwc)) + return PTR_ERR(dwc); + + if (phy_interface_mode_is_rgmii(dwc->interface)) { + regmap_update_bits(regmap, SYSMAIN_GMAC_PHY_INTF_SEL, 0x7, 0x1); + regmap_write(regmap, SYSMAIN_GMAC_GTXCLK_DLYCHAIN_SEL, 0x4); + } + + return 0; +} + +static struct of_device_id starfive_dwc_ether_compatible[] = { + { .compatible = "starfive,stmmac", .data = &starfive_drvdata }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, starfive_dwc_ether_compatible); + +static struct driver starfive_dwc_ether_driver = { + .name = "starfive-designware_eth", + .probe = starfive_dwc_ether_probe, + .of_compatible = starfive_dwc_ether_compatible, +}; +device_platform_driver(starfive_dwc_ether_driver); |