diff options
Diffstat (limited to 'drivers/net/ethernet/stmicro/stmmac/dwmac-loongson1.c')
| -rw-r--r-- | drivers/net/ethernet/stmicro/stmmac/dwmac-loongson1.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson1.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson1.c new file mode 100644 index 000000000000..de9aba756aac --- /dev/null +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson1.c @@ -0,0 +1,240 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Loongson-1 DWMAC glue layer + * + * Copyright (C) 2011-2023 Keguang Zhang <keguang.zhang@gmail.com> + */ + +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/phy.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> + +#include "stmmac.h" +#include "stmmac_platform.h" + +#define LS1B_GMAC0_BASE (0x1fe10000) +#define LS1B_GMAC1_BASE (0x1fe20000) + +/* Loongson-1 SYSCON Registers */ +#define LS1X_SYSCON0 (0x0) +#define LS1X_SYSCON1 (0x4) + +/* Loongson-1B SYSCON Register Bits */ +#define GMAC1_USE_UART1 BIT(4) +#define GMAC1_USE_UART0 BIT(3) + +#define GMAC1_SHUT BIT(13) +#define GMAC0_SHUT BIT(12) + +#define GMAC1_USE_TXCLK BIT(3) +#define GMAC0_USE_TXCLK BIT(2) +#define GMAC1_USE_PWM23 BIT(1) +#define GMAC0_USE_PWM01 BIT(0) + +/* Loongson-1C SYSCON Register Bits */ +#define GMAC_SHUT BIT(6) + +#define PHY_INTF_SELI GENMASK(30, 28) + +struct ls1x_dwmac { + struct plat_stmmacenet_data *plat_dat; + struct regmap *regmap; + unsigned int id; +}; + +struct ls1x_data { + int (*setup)(struct platform_device *pdev, + struct plat_stmmacenet_data *plat_dat); + int (*init)(struct device *dev, void *bsp_priv); +}; + +static int ls1b_dwmac_setup(struct platform_device *pdev, + struct plat_stmmacenet_data *plat_dat) +{ + struct ls1x_dwmac *dwmac = plat_dat->bsp_priv; + struct resource *res; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + /* This shouldn't fail - stmmac_get_platform_resources() + * already mapped this resource. + */ + dev_err(&pdev->dev, "Could not get IO_MEM resources\n"); + return -EINVAL; + } + + if (res->start == LS1B_GMAC0_BASE) { + dwmac->id = 0; + } else if (res->start == LS1B_GMAC1_BASE) { + dwmac->id = 1; + } else { + dev_err(&pdev->dev, "Invalid Ethernet MAC base address %pR", + res); + return -EINVAL; + } + + return 0; +} + +static int ls1b_dwmac_syscon_init(struct device *dev, void *priv) +{ + struct ls1x_dwmac *dwmac = priv; + struct plat_stmmacenet_data *plat = dwmac->plat_dat; + struct regmap *regmap = dwmac->regmap; + + if (dwmac->id == 0) { + switch (plat->phy_interface) { + case PHY_INTERFACE_MODE_RGMII_ID: + regmap_update_bits(regmap, LS1X_SYSCON0, + GMAC0_USE_TXCLK | GMAC0_USE_PWM01, + 0); + break; + case PHY_INTERFACE_MODE_MII: + regmap_update_bits(regmap, LS1X_SYSCON0, + GMAC0_USE_TXCLK | GMAC0_USE_PWM01, + GMAC0_USE_TXCLK | GMAC0_USE_PWM01); + break; + default: + dev_err(dev, "Unsupported PHY mode %u\n", + plat->phy_interface); + return -EOPNOTSUPP; + } + + regmap_update_bits(regmap, LS1X_SYSCON0, GMAC0_SHUT, 0); + } else if (dwmac->id == 1) { + regmap_update_bits(regmap, LS1X_SYSCON0, + GMAC1_USE_UART1 | GMAC1_USE_UART0, + GMAC1_USE_UART1 | GMAC1_USE_UART0); + + switch (plat->phy_interface) { + case PHY_INTERFACE_MODE_RGMII_ID: + regmap_update_bits(regmap, LS1X_SYSCON1, + GMAC1_USE_TXCLK | GMAC1_USE_PWM23, + 0); + + break; + case PHY_INTERFACE_MODE_MII: + regmap_update_bits(regmap, LS1X_SYSCON1, + GMAC1_USE_TXCLK | GMAC1_USE_PWM23, + GMAC1_USE_TXCLK | GMAC1_USE_PWM23); + break; + default: + dev_err(dev, "Unsupported PHY mode %u\n", + plat->phy_interface); + return -EOPNOTSUPP; + } + + regmap_update_bits(regmap, LS1X_SYSCON1, GMAC1_SHUT, 0); + } + + return 0; +} + +static int ls1c_dwmac_syscon_init(struct device *dev, void *priv) +{ + struct ls1x_dwmac *dwmac = priv; + struct plat_stmmacenet_data *plat = dwmac->plat_dat; + struct regmap *regmap = dwmac->regmap; + int phy_intf_sel; + + phy_intf_sel = stmmac_get_phy_intf_sel(plat->phy_interface); + if (phy_intf_sel != PHY_INTF_SEL_GMII_MII && + phy_intf_sel != PHY_INTF_SEL_RMII) { + dev_err(dev, "Unsupported PHY-mode %u\n", + plat->phy_interface); + return -EOPNOTSUPP; + } + + regmap_update_bits(regmap, LS1X_SYSCON1, PHY_INTF_SELI, + FIELD_PREP(PHY_INTF_SELI, phy_intf_sel)); + regmap_update_bits(regmap, LS1X_SYSCON0, GMAC0_SHUT, 0); + + return 0; +} + +static int ls1x_dwmac_probe(struct platform_device *pdev) +{ + struct plat_stmmacenet_data *plat_dat; + struct stmmac_resources stmmac_res; + const struct ls1x_data *data; + struct regmap *regmap; + struct ls1x_dwmac *dwmac; + int ret; + + ret = stmmac_get_platform_resources(pdev, &stmmac_res); + if (ret) + return ret; + + /* Probe syscon */ + regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, + "loongson,ls1-syscon"); + if (IS_ERR(regmap)) + return dev_err_probe(&pdev->dev, PTR_ERR(regmap), + "Unable to find syscon\n"); + + data = of_device_get_match_data(&pdev->dev); + if (!data) { + dev_err(&pdev->dev, "No of match data provided\n"); + return -EINVAL; + } + + dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL); + if (!dwmac) + return -ENOMEM; + + 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"); + + plat_dat->bsp_priv = dwmac; + plat_dat->init = data->init; + dwmac->plat_dat = plat_dat; + dwmac->regmap = regmap; + + if (data->setup) { + ret = data->setup(pdev, plat_dat); + if (ret) + return ret; + } + + return devm_stmmac_pltfr_probe(pdev, plat_dat, &stmmac_res); +} + +static const struct ls1x_data ls1b_dwmac_data = { + .setup = ls1b_dwmac_setup, + .init = ls1b_dwmac_syscon_init, +}; + +static const struct ls1x_data ls1c_dwmac_data = { + .init = ls1c_dwmac_syscon_init, +}; + +static const struct of_device_id ls1x_dwmac_match[] = { + { + .compatible = "loongson,ls1b-gmac", + .data = &ls1b_dwmac_data, + }, + { + .compatible = "loongson,ls1c-emac", + .data = &ls1c_dwmac_data, + }, + { } +}; +MODULE_DEVICE_TABLE(of, ls1x_dwmac_match); + +static struct platform_driver ls1x_dwmac_driver = { + .probe = ls1x_dwmac_probe, + .driver = { + .name = "loongson1-dwmac", + .of_match_table = ls1x_dwmac_match, + }, +}; +module_platform_driver(ls1x_dwmac_driver); + +MODULE_AUTHOR("Keguang Zhang <keguang.zhang@gmail.com>"); +MODULE_DESCRIPTION("Loongson-1 DWMAC glue layer"); +MODULE_LICENSE("GPL"); |