[PATCH net-next 3/3] net: stmmac: add glue layer for T-HEAD TH1520 SoC
Jisheng Zhang
jszhang at kernel.org
Sun Aug 20 05:02:13 PDT 2023
Add dwmac glue driver to support the dwmac on the T-HEAD TH1520 SoC.
Signed-off-by: Jisheng Zhang <jszhang at kernel.org>
---
drivers/net/ethernet/stmicro/stmmac/Kconfig | 11 +
drivers/net/ethernet/stmicro/stmmac/Makefile | 1 +
.../net/ethernet/stmicro/stmmac/dwmac-thead.c | 304 ++++++++++++++++++
3 files changed, 316 insertions(+)
create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-thead.c
diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index 06c6871f8788..1bf71804c270 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -216,6 +216,17 @@ config DWMAC_SUN8I
stmmac device driver. This driver is used for H3/A83T/A64
EMAC ethernet controller.
+config DWMAC_THEAD
+ tristate "T-HEAD dwmac support"
+ depends on OF && (ARCH_THEAD || COMPILE_TEST)
+ select MFD_SYSCON
+ help
+ Support for ethernet controllers on T-HEAD RISC-V SoCs
+
+ This selects the T-HEAD platform specific glue layer support for
+ the stmmac device driver. This driver is used for T-HEAD TH1520
+ ethernet controller.
+
config DWMAC_IMX8
tristate "NXP IMX8 DWMAC support"
default ARCH_MXC
diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index 5b57aee19267..d73171ed6ad7 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -27,6 +27,7 @@ obj-$(CONFIG_DWMAC_STI) += dwmac-sti.o
obj-$(CONFIG_DWMAC_STM32) += dwmac-stm32.o
obj-$(CONFIG_DWMAC_SUNXI) += dwmac-sunxi.o
obj-$(CONFIG_DWMAC_SUN8I) += dwmac-sun8i.o
+obj-$(CONFIG_DWMAC_THEAD) += dwmac-thead.o
obj-$(CONFIG_DWMAC_DWC_QOS_ETH) += dwmac-dwc-qos-eth.o
obj-$(CONFIG_DWMAC_INTEL_PLAT) += dwmac-intel-plat.o
obj-$(CONFIG_DWMAC_GENERIC) += dwmac-generic.o
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-thead.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-thead.c
new file mode 100644
index 000000000000..1a5a174b88ff
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-thead.c
@@ -0,0 +1,304 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * T-HEAD DWMAC platform driver
+ *
+ * Copyright (C) 2023 Jisheng Zhang <jszhang at kernel.org>
+ * Copyright (C) 2021 Alibaba Group Holding Limited.
+ *
+ */
+
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_net.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include "stmmac_platform.h"
+
+#define GMAC_CLK_EN 0x00
+#define GMAC_TX_CLK_EN BIT(1)
+#define GMAC_TX_CLK_N_EN BIT(2)
+#define GMAC_TX_CLK_OUT_EN BIT(3)
+#define GMAC_RX_CLK_EN BIT(4)
+#define GMAC_RX_CLK_N_EN BIT(5)
+#define GMAC_EPHY_REF_CLK_EN BIT(6)
+#define GMAC_RXCLK_DELAY_CTRL 0x04
+#define GMAC_RXCLK_BYPASS BIT(15)
+#define GMAC_RXCLK_INVERT BIT(14)
+#define GMAC_RXCLK_DELAY_MASK GENMASK(4, 0)
+#define GMAC_RXCLK_DELAY_VAL(x) FIELD_PREP(GMAC_RXCLK_DELAY_MASK, (x))
+#define GMAC_TXCLK_DELAY_CTRL 0x08
+#define GMAC_TXCLK_BYPASS BIT(15)
+#define GMAC_TXCLK_INVERT BIT(14)
+#define GMAC_TXCLK_DELAY_MASK GENMASK(4, 0)
+#define GMAC_TXCLK_DELAY_VAL(x) FIELD_PREP(GMAC_RXCLK_DELAY_MASK, (x))
+#define GMAC_PLLCLK_DIV 0x0c
+#define GMAC_PLLCLK_DIV_EN BIT(31)
+#define GMAC_PLLCLK_DIV_MASK GENMASK(7, 0)
+#define GMAC_PLLCLK_DIV_NUM(x) FIELD_PREP(GMAC_PLLCLK_DIV_MASK, (x))
+#define GMAC_GTXCLK_SEL 0x18
+#define GMAC_GTXCLK_SEL_PLL BIT(0)
+#define GMAC_INTF_CTRL 0x1c
+#define PHY_INTF_MASK BIT(0)
+#define PHY_INTF_RGMII FIELD_PREP(PHY_INTF_MASK, 1)
+#define PHY_INTF_MII_GMII FIELD_PREP(PHY_INTF_MASK, 0)
+#define GMAC_TXCLK_OEN 0x20
+#define TXCLK_DIR_MASK BIT(0)
+#define TXCLK_DIR_OUTPUT FIELD_PREP(TXCLK_DIR_MASK, 0)
+#define TXCLK_DIR_INPUT FIELD_PREP(TXCLK_DIR_MASK, 1)
+
+#define GMAC_GMII_RGMII_RATE 125000000
+#define GMAC_MII_RATE 25000000
+
+struct thead_dwmac {
+ struct plat_stmmacenet_data *plat;
+ struct regmap *apb_regmap;
+ struct device *dev;
+ struct clk *clk_axi;
+ u32 rx_delay;
+ u32 tx_delay;
+};
+
+static int thead_dwmac_set_phy_if(struct plat_stmmacenet_data *plat)
+{
+ struct thead_dwmac *dwmac = plat->bsp_priv;
+ u32 phyif;
+
+ switch (plat->interface) {
+ case PHY_INTERFACE_MODE_MII:
+ phyif = PHY_INTF_MII_GMII;
+ break;
+ case PHY_INTERFACE_MODE_RGMII:
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ case PHY_INTERFACE_MODE_RGMII_TXID:
+ case PHY_INTERFACE_MODE_RGMII_RXID:
+ phyif = PHY_INTF_RGMII;
+ break;
+ default:
+ dev_err(dwmac->dev, "unsupported phy interface %d\n",
+ plat->interface);
+ return -EINVAL;
+ };
+
+ regmap_write(dwmac->apb_regmap, GMAC_INTF_CTRL, phyif);
+
+ return 0;
+}
+
+static int thead_dwmac_set_txclk_dir(struct plat_stmmacenet_data *plat)
+{
+ struct thead_dwmac *dwmac = plat->bsp_priv;
+ u32 txclk_dir;;
+
+ switch (plat->interface) {
+ case PHY_INTERFACE_MODE_MII:
+ txclk_dir = TXCLK_DIR_INPUT;
+ break;
+ case PHY_INTERFACE_MODE_RGMII:
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ case PHY_INTERFACE_MODE_RGMII_TXID:
+ case PHY_INTERFACE_MODE_RGMII_RXID:
+ txclk_dir = TXCLK_DIR_OUTPUT;
+ break;
+ default:
+ dev_err(dwmac->dev, "unsupported phy interface %d\n",
+ plat->interface);
+ return -EINVAL;
+ };
+
+ regmap_write(dwmac->apb_regmap, GMAC_TXCLK_OEN, txclk_dir);
+
+ return 0;
+}
+
+static void thead_dwmac_fix_speed(void *priv, unsigned int speed, unsigned int mode)
+{
+ struct thead_dwmac *dwmac = priv;
+ struct plat_stmmacenet_data *plat = dwmac->plat;
+ unsigned long rate;
+ u32 div;
+
+ switch (plat->interface) {
+ /* For MII, rxc/txc is provided by phy */
+ case PHY_INTERFACE_MODE_MII:
+ return;
+
+ case PHY_INTERFACE_MODE_RGMII:
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ case PHY_INTERFACE_MODE_RGMII_RXID:
+ case PHY_INTERFACE_MODE_RGMII_TXID:
+ rate = clk_get_rate(plat->stmmac_clk);
+ if (!rate || rate % GMAC_GMII_RGMII_RATE != 0 ||
+ rate % GMAC_MII_RATE != 0) {
+ dev_err(dwmac->dev, "invalid gmac rate %ld\n", rate);
+ return;
+ }
+
+ regmap_update_bits(dwmac->apb_regmap, GMAC_PLLCLK_DIV, GMAC_PLLCLK_DIV_EN, 0);
+
+ switch (speed) {
+ case SPEED_1000:
+ div = rate / GMAC_GMII_RGMII_RATE;
+ break;
+ case SPEED_100:
+ div = rate / GMAC_MII_RATE;
+ break;
+ case SPEED_10:
+ div = rate * 10 / GMAC_MII_RATE;
+ break;
+ default:
+ dev_err(dwmac->dev, "invalid speed %u\n", speed);
+ break;
+ }
+ regmap_update_bits(dwmac->apb_regmap, GMAC_PLLCLK_DIV,
+ GMAC_PLLCLK_DIV_MASK, GMAC_PLLCLK_DIV_NUM(div));
+
+ regmap_update_bits(dwmac->apb_regmap, GMAC_PLLCLK_DIV,
+ GMAC_PLLCLK_DIV_EN, GMAC_PLLCLK_DIV_EN);
+ break;
+ default:
+ dev_err(dwmac->dev, "unsupported phy interface %d\n",
+ plat->interface);
+ return;
+ }
+}
+
+static int thead_dwmac_enable_clk(struct plat_stmmacenet_data *plat)
+{
+ struct thead_dwmac *dwmac = plat->bsp_priv;
+ u32 reg;
+
+ switch (plat->interface) {
+ case PHY_INTERFACE_MODE_MII:
+ reg = GMAC_RX_CLK_EN | GMAC_TX_CLK_EN;
+ break;
+
+ case PHY_INTERFACE_MODE_RGMII:
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ case PHY_INTERFACE_MODE_RGMII_RXID:
+ case PHY_INTERFACE_MODE_RGMII_TXID:
+ /* use pll */
+ regmap_write(dwmac->apb_regmap, GMAC_GTXCLK_SEL, GMAC_GTXCLK_SEL_PLL);
+
+ reg = GMAC_TX_CLK_EN | GMAC_TX_CLK_N_EN | GMAC_TX_CLK_OUT_EN |
+ GMAC_RX_CLK_EN | GMAC_RX_CLK_N_EN;
+ break;
+
+ default:
+ dev_err(dwmac->dev, "unsupported phy interface %d\n",
+ plat->interface);
+ return -EINVAL;
+ }
+
+ regmap_write(dwmac->apb_regmap, GMAC_CLK_EN, reg);
+
+ return 0;
+}
+
+static int thead_dwmac_init(struct platform_device *pdev,
+ struct plat_stmmacenet_data *plat)
+{
+ struct thead_dwmac *dwmac = plat->bsp_priv;
+ int ret;
+
+ ret = thead_dwmac_set_phy_if(plat);
+ if (ret)
+ return ret;
+
+ ret = thead_dwmac_set_txclk_dir(plat);
+ if (ret)
+ return ret;
+
+ regmap_write(dwmac->apb_regmap, GMAC_RXCLK_DELAY_CTRL,
+ GMAC_RXCLK_DELAY_VAL(dwmac->rx_delay));
+ regmap_write(dwmac->apb_regmap, GMAC_TXCLK_DELAY_CTRL,
+ GMAC_TXCLK_DELAY_VAL(dwmac->tx_delay));
+
+ thead_dwmac_fix_speed(dwmac, SPEED_1000, 0);
+
+ return thead_dwmac_enable_clk(plat);
+}
+
+static int thead_dwmac_probe(struct platform_device *pdev)
+{
+ struct plat_stmmacenet_data *plat;
+ struct stmmac_resources stmmac_res;
+ struct thead_dwmac *dwmac;
+ struct device_node *np = pdev->dev.of_node;
+ u32 delay_ps;
+ int ret;
+
+ ret = stmmac_get_platform_resources(pdev, &stmmac_res);
+ if (ret)
+ return dev_err_probe(&pdev->dev, ret,
+ "failed to get resources\n");
+
+ plat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
+ if (IS_ERR(plat))
+ return dev_err_probe(&pdev->dev, PTR_ERR(plat),
+ "dt configuration failed\n");
+
+ dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
+ if (!dwmac)
+ return -ENOMEM;
+
+ dwmac->clk_axi = devm_clk_get_enabled(&pdev->dev, "axi");
+ if (IS_ERR(dwmac->clk_axi))
+ return dev_err_probe(&pdev->dev, PTR_ERR(dwmac->clk_axi),
+ "error getting axi clock\n");
+
+ if (!of_property_read_u32(np, "rx-internal-delay-ps", &delay_ps))
+ dwmac->rx_delay = delay_ps;
+ if (!of_property_read_u32(np, "tx-internal-delay-ps", &delay_ps))
+ dwmac->tx_delay = delay_ps;
+
+ dwmac->apb_regmap = syscon_regmap_lookup_by_phandle(np, "thead,gmacapb");
+ if (IS_ERR(dwmac->apb_regmap)) {
+ dev_err(&pdev->dev, "Failed to get gmac apb syscon\n");
+ return PTR_ERR(dwmac->apb_regmap);
+ }
+
+ dwmac->dev = &pdev->dev;
+ dwmac->plat = plat;
+ plat->bsp_priv = dwmac;
+ plat->fix_mac_speed = thead_dwmac_fix_speed;
+
+ ret = thead_dwmac_init(pdev, plat);
+ if (ret)
+ goto err_dvr_probe;
+
+ ret = stmmac_dvr_probe(&pdev->dev, plat, &stmmac_res);
+ if (ret)
+ goto err_dvr_probe;
+
+ return 0;
+
+err_dvr_probe:
+ stmmac_remove_config_dt(pdev, plat);
+
+ return ret;
+}
+
+static const struct of_device_id thead_dwmac_match[] = {
+ { .compatible = "thead,th1520-dwmac" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, thead_dwmac_match);
+
+static struct platform_driver thead_dwmac_driver = {
+ .probe = thead_dwmac_probe,
+ .remove_new = stmmac_pltfr_remove,
+ .driver = {
+ .name = "thead-dwmac",
+ .pm = &stmmac_pltfr_pm_ops,
+ .of_match_table = thead_dwmac_match,
+ },
+};
+module_platform_driver(thead_dwmac_driver);
+
+MODULE_AUTHOR("T-HEAD");
+MODULE_AUTHOR("Jisheng Zhang <jszhang at kernel.org>");
+MODULE_DESCRIPTION("T-HEAD dwmac platform driver");
+MODULE_LICENSE("GPL");
--
2.40.1
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