[PATCH v4 3/4] net: stmmac: Add glue layer for Loongson-1 SoC
From: Keguang Zhang
Date: Wed Aug 30 2023 - 14:55:57 EST
This glue driver is created based on the arch-code
implemented earlier with the platform-specific settings.
Use syscon for SYSCON register access.
Partially based on the previous work by Serge Semin.
Signed-off-by: Keguang Zhang <keguang.zhang@xxxxxxxxx>
---
V3 -> V4: Drop ls1x_dwmac_syscon definition and its instances
Drop three redundant fields from the ls1x_dwmac structure
Drop the ls1x_dwmac_init() method.
Some minor improvements
V2 -> V3: Determine the device ID by physical
base address(suggested by Serge Semin)
Use regmap instead of regmap fields
Use syscon_regmap_lookup_by_phandle()
Some minor fixes
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 | 219 ++++++++++++++++++
3 files changed, 231 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..f1732f15ff87
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson1.c
@@ -0,0 +1,219 @@
+// 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"
+
+#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)
+#define PHY_INTF_MII FIELD_PREP(PHY_INTF_SELI, 0)
+#define PHY_INTF_RMII FIELD_PREP(PHY_INTF_SELI, 4)
+
+struct ls1x_dwmac {
+ struct plat_stmmacenet_data *plat_dat;
+ struct regmap *regmap;
+};
+
+static int ls1b_dwmac_syscon_init(struct platform_device *pdev, void *priv)
+{
+ struct ls1x_dwmac *dwmac = priv;
+ struct plat_stmmacenet_data *plat = dwmac->plat_dat;
+ struct regmap *regmap = dwmac->regmap;
+ struct resource *res;
+ unsigned long reg_base;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "Could not get IO_MEM resources\n");
+ return -EINVAL;
+ }
+ reg_base = (unsigned long)res->start;
+
+ if (reg_base == LS1B_GMAC0_BASE) {
+ 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(&pdev->dev, "Unsupported PHY mode %u\n",
+ plat->phy_interface);
+ return -EOPNOTSUPP;
+ }
+
+ regmap_update_bits(regmap, LS1X_SYSCON0, GMAC0_SHUT, 0);
+ } else if (reg_base == LS1B_GMAC1_BASE) {
+ 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(&pdev->dev, "Unsupported PHY mode %u\n",
+ plat->phy_interface);
+ return -EOPNOTSUPP;
+ }
+
+ regmap_update_bits(regmap, LS1X_SYSCON1, GMAC1_SHUT, 0);
+ } else {
+ dev_err(&pdev->dev, "Invalid Ethernet MAC base address %lx",
+ reg_base);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int ls1c_dwmac_syscon_init(struct platform_device *pdev, void *priv)
+{
+ struct ls1x_dwmac *dwmac = priv;
+ struct plat_stmmacenet_data *plat = dwmac->plat_dat;
+ struct regmap *regmap = dwmac->regmap;
+
+ switch (plat->phy_interface) {
+ case PHY_INTERFACE_MODE_MII:
+ regmap_update_bits(regmap, LS1X_SYSCON1, PHY_INTF_SELI,
+ PHY_INTF_MII);
+ break;
+ case PHY_INTERFACE_MODE_RMII:
+ regmap_update_bits(regmap, LS1X_SYSCON1, PHY_INTF_SELI,
+ PHY_INTF_RMII);
+ break;
+ default:
+ dev_err(&pdev->dev, "Unsupported PHY-mode %u\n",
+ plat->phy_interface);
+ return -EOPNOTSUPP;
+ }
+
+ 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;
+ struct regmap *regmap;
+ struct ls1x_dwmac *dwmac;
+ int (*init)(struct platform_device *pdev, void *priv);
+ 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");
+
+ init = of_device_get_match_data(&pdev->dev);
+ if (!init) {
+ 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 = 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 = init;
+ dwmac->plat_dat = plat_dat;
+ 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:
+ stmmac_remove_config_dt(pdev, plat_dat);
+
+ return ret;
+}
+
+static const struct of_device_id ls1x_dwmac_match[] = {
+ {
+ .compatible = "loongson,ls1b-gmac",
+ .data = &ls1b_dwmac_syscon_init,
+ },
+ {
+ .compatible = "loongson,ls1c-emac",
+ .data = &ls1c_dwmac_syscon_init,
+ },
+ { }
+};
+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("Loongson-1 DWMAC glue layer");
+MODULE_LICENSE("GPL");
--
2.39.2