This glue driver is created based on the arch-code
implemented earlier with the platform-specific settings.
Use syscon for SYSCON register access.
Partialy based on the previous work by Serge Semin.
Signed-off-by: Keguang Zhang <keguang.zhang@xxxxxxxxx>
---
V1 -> V2: Fix the build errors due to CONFIG_OF being unset
Change struct reg_field definitions to const
Rename the syscon property to "loongson,dwmac-syscon"
Add MII PHY mode for LS1C
drivers/net/ethernet/stmicro/stmmac/Kconfig | 11 +
drivers/net/ethernet/stmicro/stmmac/Makefile | 1 +
.../ethernet/stmicro/stmmac/dwmac-loongson1.c | 273 ++++++++++++++++++
3 files changed, 285 insertions(+)
create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-loongson1.c
diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index 06c6871f8788..a2b9e289aa36 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -239,6 +239,17 @@ config DWMAC_INTEL_PLAT
the stmmac device driver. This driver is used for the Intel Keem Bay
SoC.
+config DWMAC_LOONGSON1
+ tristate "Loongson1 GMAC support"
+ default MACH_LOONGSON32
+ depends on OF && (MACH_LOONGSON32 || COMPILE_TEST)
+ help
+ Support for ethernet controller on Loongson1 SoC.
+
+ This selects Loongson1 SoC glue layer support for the stmmac
+ device driver. This driver is used for Loongson1-based boards
+ like Loongson LS1B/LS1C.
+
config DWMAC_TEGRA
tristate "NVIDIA Tegra MGBE support"
depends on ARCH_TEGRA || COMPILE_TEST
diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index 5b57aee19267..80e598bd4255 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_DWMAC_SUNXI) += dwmac-sunxi.o
obj-$(CONFIG_DWMAC_SUN8I) += dwmac-sun8i.o
obj-$(CONFIG_DWMAC_DWC_QOS_ETH) += dwmac-dwc-qos-eth.o
obj-$(CONFIG_DWMAC_INTEL_PLAT) += dwmac-intel-plat.o
+obj-$(CONFIG_DWMAC_LOONGSON1) += dwmac-loongson1.o
obj-$(CONFIG_DWMAC_GENERIC) += dwmac-generic.o
obj-$(CONFIG_DWMAC_IMX8) += dwmac-imx.o
obj-$(CONFIG_DWMAC_TEGRA) += dwmac-tegra.o
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..5210b5e8ae47
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson1.c
@@ -0,0 +1,273 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Loongson-1 DWMAC glue layer
+ *
+ * Copyright (C) 2011-2023 Keguang Zhang <keguang.zhang@xxxxxxxxx>
+ */
+
+#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"
+
+/* Loongson-1 SYSCON Registers */
+#define LS1X_SYSCON0 (0x0)
+#define LS1X_SYSCON1 (0x4)
+
+struct ls1x_dwmac_syscon {
+ const struct reg_field *reg_fields;
+ unsigned int nr_reg_fields;
+ int (*syscon_init)(struct plat_stmmacenet_data *plat);
+};
+
+struct ls1x_dwmac {
+ struct device *dev;
+ struct plat_stmmacenet_data *plat_dat;
+ const struct ls1x_dwmac_syscon *syscon;
+ struct regmap *regmap;
+ struct regmap_field *regmap_fields[];
+};
+
+enum ls1b_dwmac_syscon_regfield {
+ GMAC1_USE_UART1,
+ GMAC1_USE_UART0,
+ GMAC1_SHUT,
+ GMAC0_SHUT,
+ GMAC1_USE_TXCLK,
+ GMAC0_USE_TXCLK,
+ GMAC1_USE_PWM23,
+ GMAC0_USE_PWM01,
+};
+
+enum ls1c_dwmac_syscon_regfield {
+ GMAC_SHUT,
+ PHY_INTF_SELI,
+};
+
+static const struct reg_field ls1b_dwmac_syscon_regfields[] = {
+ [GMAC1_USE_UART1] = REG_FIELD(LS1X_SYSCON0, 4, 4),
+ [GMAC1_USE_UART0] = REG_FIELD(LS1X_SYSCON0, 3, 3),
+ [GMAC1_SHUT] = REG_FIELD(LS1X_SYSCON1, 13, 13),
+ [GMAC0_SHUT] = REG_FIELD(LS1X_SYSCON1, 12, 12),
+ [GMAC1_USE_TXCLK] = REG_FIELD(LS1X_SYSCON1, 3, 3),
+ [GMAC0_USE_TXCLK] = REG_FIELD(LS1X_SYSCON1, 2, 2),
+ [GMAC1_USE_PWM23] = REG_FIELD(LS1X_SYSCON1, 1, 1),
+ [GMAC0_USE_PWM01] = REG_FIELD(LS1X_SYSCON1, 0, 0)
+};
+
+static const struct reg_field ls1c_dwmac_syscon_regfields[] = {
+ [GMAC_SHUT] = REG_FIELD(LS1X_SYSCON0, 6, 6),
+ [PHY_INTF_SELI] = REG_FIELD(LS1X_SYSCON1, 28, 30)
+};
+
+static int ls1b_dwmac_syscon_init(struct plat_stmmacenet_data *plat)
+{
+ struct ls1x_dwmac *dwmac = plat->bsp_priv;
+ struct regmap_field **regmap_fields = dwmac->regmap_fields;
+
+ if (plat->bus_id) {
+ regmap_field_write(regmap_fields[GMAC1_USE_UART1], 1);
+ regmap_field_write(regmap_fields[GMAC1_USE_UART0], 1);
+
+ switch (plat->phy_interface) {
+ case PHY_INTERFACE_MODE_RGMII:
+ regmap_field_write(regmap_fields[GMAC1_USE_TXCLK], 0);
+ regmap_field_write(regmap_fields[GMAC1_USE_PWM23], 0);
+ break;
+ case PHY_INTERFACE_MODE_MII:
+ regmap_field_write(regmap_fields[GMAC1_USE_TXCLK], 1);
+ regmap_field_write(regmap_fields[GMAC1_USE_PWM23], 1);
+ break;
+ default:
+ dev_err(dwmac->dev, "Unsupported PHY mode %u\n",
+ plat->phy_interface);
+ return -EOPNOTSUPP;
+ }
+
+ regmap_field_write(regmap_fields[GMAC1_SHUT], 0);
+ } else {
+ switch (plat->phy_interface) {
+ case PHY_INTERFACE_MODE_RGMII:
+ regmap_field_write(regmap_fields[GMAC0_USE_TXCLK], 0);
+ regmap_field_write(regmap_fields[GMAC0_USE_PWM01], 0);
+ break;
+ case PHY_INTERFACE_MODE_MII:
+ regmap_field_write(regmap_fields[GMAC0_USE_TXCLK], 1);
+ regmap_field_write(regmap_fields[GMAC0_USE_PWM01], 1);
+ break;
+ default:
+ dev_err(dwmac->dev, "Unsupported PHY mode %u\n",
+ plat->phy_interface);
+ return -EOPNOTSUPP;
+ }
+
+ regmap_field_write(regmap_fields[GMAC0_SHUT], 0);
+ }
+
+ return 0;
+}
+
+static int ls1c_dwmac_syscon_init(struct plat_stmmacenet_data *plat)
+{
+ struct ls1x_dwmac *dwmac = plat->bsp_priv;
+ struct regmap_field **regmap_fields = dwmac->regmap_fields;
+
+ switch (plat->phy_interface) {
+ case PHY_INTERFACE_MODE_MII:
+ regmap_field_write(regmap_fields[PHY_INTF_SELI], 0);
+ break;
+ case PHY_INTERFACE_MODE_RMII:
+ regmap_field_write(regmap_fields[PHY_INTF_SELI], 4);
+ break;
+ default:
+ dev_err(dwmac->dev, "Unsupported PHY-mode %u\n",
+ plat->phy_interface);
+ return -EOPNOTSUPP;
+ }
+
+ regmap_field_write(regmap_fields[GMAC_SHUT], 0);
+
+ return 0;
+}
+
+static const struct ls1x_dwmac_syscon ls1b_dwmac_syscon = {
+ .reg_fields = ls1b_dwmac_syscon_regfields,
+ .nr_reg_fields = ARRAY_SIZE(ls1b_dwmac_syscon_regfields),
+ .syscon_init = ls1b_dwmac_syscon_init,
+};
+
+static const struct ls1x_dwmac_syscon ls1c_dwmac_syscon = {
+ .reg_fields = ls1c_dwmac_syscon_regfields,
+ .nr_reg_fields = ARRAY_SIZE(ls1c_dwmac_syscon_regfields),
+ .syscon_init = ls1c_dwmac_syscon_init,
+};
+
+static int ls1x_dwmac_init(struct platform_device *pdev, void *priv)
+{
+ struct ls1x_dwmac *dwmac = priv;
+ int ret;
+
+ ret = devm_regmap_field_bulk_alloc(dwmac->dev, dwmac->regmap,
+ dwmac->regmap_fields,
+ dwmac->syscon->reg_fields,
+ dwmac->syscon->nr_reg_fields);
+ if (ret)
+ return ret;
+
+ if (dwmac->syscon->syscon_init) {
+ ret = dwmac->syscon->syscon_init(dwmac->plat_dat);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct of_device_id ls1x_dwmac_syscon_match[] = {
+ {
+ .compatible = "loongson,ls1b-dwmac-syscon",
+ .data = &ls1b_dwmac_syscon,
+ },
+ {
+ .compatible = "loongson,ls1c-dwmac-syscon",
+ .data = &ls1c_dwmac_syscon,
+ },
+ { }
+};
+
+static int ls1x_dwmac_probe(struct platform_device *pdev)
+{
+ struct plat_stmmacenet_data *plat_dat;
+ struct stmmac_resources stmmac_res;
+ struct device_node *syscon_np;
+ const struct of_device_id *match;
+ struct regmap *regmap;
+ struct ls1x_dwmac *dwmac;
+ const struct ls1x_dwmac_syscon *syscon;
+ size_t size;
+ int ret;
+
+ ret = stmmac_get_platform_resources(pdev, &stmmac_res);
+ if (ret)
+ return ret;
+
+ /* Probe syscon */
+ syscon_np =
+ of_parse_phandle(pdev->dev.of_node, "loongson,dwmac-syscon", 0);
+ if (!syscon_np) {
+ dev_err(&pdev->dev, "missing loongson,dwmac-syscon property\n");
+ return -ENODEV;
+ }
+
+ match = of_match_node(ls1x_dwmac_syscon_match, syscon_np);
+ if (!match) {
+ dev_err(&pdev->dev, "no matching node found in dtb\n");
+ of_node_put(syscon_np);
+ return -EINVAL;
+ }
+ syscon = (const struct ls1x_dwmac_syscon *)match->data;
+
+ regmap = syscon_node_to_regmap(syscon_np);
+ of_node_put(syscon_np);
+ if (IS_ERR(regmap)) {
+ ret = PTR_ERR(regmap);
+ dev_err(&pdev->dev, "Unable to map syscon: %d\n", ret);
+ return ret;
+ }
+
+ size = syscon->nr_reg_fields * sizeof(struct regmap_field *);
+ dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac) + size, GFP_KERNEL);
+ if (!dwmac)
+ return -ENOMEM;
+
+ plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
+ if (IS_ERR(plat_dat)) {
+ dev_err(&pdev->dev, "dt configuration failed\n");
+ return PTR_ERR(plat_dat);
+ }
+
+ plat_dat->bsp_priv = dwmac;
+ plat_dat->init = ls1x_dwmac_init;
+ dwmac->dev = &pdev->dev;
+ dwmac->plat_dat = plat_dat;
+ dwmac->syscon = syscon;
+ dwmac->regmap = regmap;
+
+ ret = stmmac_pltfr_probe(pdev, plat_dat, &stmmac_res);
+ if (ret)
+ goto err_remove_config_dt;
+
+ return 0;
+
+err_remove_config_dt:
+ if (pdev->dev.of_node)
+ stmmac_remove_config_dt(pdev, plat_dat);
+
+ return ret;
+}
+
+static const struct of_device_id ls1x_dwmac_match[] = {
+ { .compatible = "loongson,ls1b-dwmac" },
+ { .compatible = "loongson,ls1c-dwmac" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ls1x_dwmac_match);
+
+static struct platform_driver ls1x_dwmac_driver = {
+ .probe = ls1x_dwmac_probe,
+ .remove_new = stmmac_pltfr_remove,
+ .driver = {
+ .name = "loongson1-dwmac",
+ .of_match_table = ls1x_dwmac_match,
+ },
+};
+module_platform_driver(ls1x_dwmac_driver);
+
+MODULE_AUTHOR("Keguang Zhang <keguang.zhang@xxxxxxxxx>");
+MODULE_DESCRIPTION("Loongson1 DWMAC glue layer");
+MODULE_LICENSE("GPL");
--
2.39.2
