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Message-ID: <20260120043609.910302-4-inochiama@gmail.com>
Date: Tue, 20 Jan 2026 12:36:08 +0800
From: Inochi Amaoto <inochiama@...il.com>
To: Andrew Lunn <andrew+netdev@...n.ch>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Yixun Lan <dlan@...too.org>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
Richard Cochran <richardcochran@...il.com>,
Paul Walmsley <pjw@...nel.org>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Alexandre Ghiti <alex@...ti.fr>,
"Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
Yanteng Si <siyanteng@...oftware.com.cn>,
Yao Zi <ziyao@...root.org>,
Vladimir Oltean <vladimir.oltean@....com>,
Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
Inochi Amaoto <inochiama@...il.com>,
Choong Yong Liang <yong.liang.choong@...ux.intel.com>,
Maxime Chevallier <maxime.chevallier@...tlin.com>,
Chen-Yu Tsai <wens@...nel.org>,
Shangjuan Wei <weishangjuan@...incomputing.com>,
Boon Khai Ng <boon.khai.ng@...era.com>,
Quentin Schulz <quentin.schulz@...rry.de>,
Giuseppe Cavallaro <peppe.cavallaro@...com>,
Jose Abreu <joabreu@...opsys.com>
Cc: netdev@...r.kernel.org,
devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-riscv@...ts.infradead.org,
spacemit@...ts.linux.dev,
linux-stm32@...md-mailman.stormreply.com,
linux-arm-kernel@...ts.infradead.org,
Longbin Li <looong.bin@...il.com>
Subject: [PATCH net-next 3/3] net: stmmac: Add glue layer for Spacemit K3 SoC
Adds Spacemit dwmac driver support on the Spacemit K3 SoC.
Signed-off-by: Inochi Amaoto <inochiama@...il.com>
---
drivers/net/ethernet/stmicro/stmmac/Kconfig | 12 +
drivers/net/ethernet/stmicro/stmmac/Makefile | 1 +
.../ethernet/stmicro/stmmac/dwmac-spacemit.c | 224 ++++++++++++++++++
3 files changed, 237 insertions(+)
create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-spacemit.c
diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index 907fe2e927f0..583a4692f5da 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -216,6 +216,18 @@ config DWMAC_SOPHGO
for the stmmac device driver. This driver is used for the
ethernet controllers on various Sophgo SoCs.
+config DWMAC_SPACEMIT
+ tristate "Spacemit dwmac support"
+ depends on OF && (ARCH_SPACEMIT || COMPILE_TEST)
+ select MFD_SYSCON
+ default m if ARCH_SPACEMIT
+ help
+ Support for ethernet controllers on Spacemit RISC-V SoCs
+
+ This selects the Spacemit platform specific glue layer support
+ for the stmmac device driver. This driver is used for the
+ Spacemit K3 ethernet controllers.
+
config DWMAC_STARFIVE
tristate "StarFive dwmac support"
depends on OF && (ARCH_STARFIVE || COMPILE_TEST)
diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index 7bf528731034..9e32045631d8 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -27,6 +27,7 @@ obj-$(CONFIG_DWMAC_RZN1) += dwmac-rzn1.o
obj-$(CONFIG_DWMAC_S32) += dwmac-s32.o
obj-$(CONFIG_DWMAC_SOCFPGA) += dwmac-altr-socfpga.o
obj-$(CONFIG_DWMAC_SOPHGO) += dwmac-sophgo.o
+obj-$(CONFIG_DWMAC_SPACEMIT) += dwmac-spacemit.o
obj-$(CONFIG_DWMAC_STARFIVE) += dwmac-starfive.o
obj-$(CONFIG_DWMAC_STI) += dwmac-sti.o
obj-$(CONFIG_DWMAC_STM32) += dwmac-stm32.o
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-spacemit.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-spacemit.c
new file mode 100644
index 000000000000..72744e60d02a
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-spacemit.c
@@ -0,0 +1,224 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Spacemit DWMAC platform driver
+ *
+ * Copyright (C) 2026 Inochi Amaoto <inochiama@...il.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/mfd/syscon.h>
+#include <linux/math.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+
+#include "stmmac_platform.h"
+
+/* ctrl register bits */
+#define PHY_INTF_RGMII BIT(3)
+#define PHY_INTF_MII BIT(4)
+
+#define WAKE_IRQ_EN BIT(9)
+#define PHY_IRQ_EN BIT(12)
+
+/* dline register bits */
+#define RGMII_RX_DLINE_EN BIT(0)
+#define RGMII_RX_DLINE_STEP GENMASK(5, 4)
+#define RGMII_RX_DLINE_CODE GENMASK(15, 8)
+#define RGMII_TX_DLINE_EN BIT(16)
+#define RGMII_TX_DLINE_STEP GENMASK(21, 20)
+#define RGMII_TX_DLINE_CODE GENMASK(31, 24)
+
+#define MAX_DLINE_DELAY_CODE 0xff
+
+struct spacemit_dwmac {
+ struct device *dev;
+ struct clk *tx;
+};
+
+/* Note: the delay step value is at 0.1ps */
+static const unsigned int k3_delay_step_10x[4] = {
+ 367, 493, 559, 685
+};
+
+static int spacemit_dwmac_set_delay(struct regmap *apmu,
+ unsigned int dline_offset,
+ unsigned int tx_code, unsigned int tx_config,
+ unsigned int rx_code, unsigned int rx_config)
+{
+ unsigned int mask, val;
+
+ mask = RGMII_RX_DLINE_STEP | RGMII_TX_DLINE_CODE | RGMII_TX_DLINE_EN |
+ RGMII_TX_DLINE_STEP | RGMII_RX_DLINE_CODE | RGMII_RX_DLINE_EN;
+ val = FIELD_PREP(RGMII_TX_DLINE_CODE, tx_config) |
+ FIELD_PREP(RGMII_TX_DLINE_CODE, tx_code) | RGMII_TX_DLINE_EN |
+ FIELD_PREP(RGMII_TX_DLINE_CODE, rx_config) |
+ FIELD_PREP(RGMII_RX_DLINE_CODE, rx_code) | RGMII_RX_DLINE_EN;
+
+ return regmap_update_bits(apmu, dline_offset, mask, val);
+}
+
+static int spacemit_dwmac_detected_delay_value(unsigned int delay,
+ unsigned int *config)
+{
+ int i;
+ int code, best_code = 0;
+ unsigned int best_delay = 0;
+ unsigned int best_config = 0;
+
+ if (delay == 0)
+ return 0;
+
+ for (i = 0; i < ARRAY_SIZE(k3_delay_step_10x); i++) {
+ unsigned int step = k3_delay_step_10x[i];
+
+ for (code = 1; code <= MAX_DLINE_DELAY_CODE; code++) {
+ /*
+ * Note K3 require a specific factor for calculate
+ * the delay, in this scenario it is 0.9. So the
+ * formula is code * step / 10 * 0.9
+ */
+ unsigned int tmp = code * step * 9 / 10 / 10;
+
+ if (abs(tmp - delay) < abs(best_delay - delay)) {
+ best_code = code;
+ best_delay = tmp;
+ best_config = i;
+ }
+ }
+ }
+
+ *config = best_config;
+
+ return best_code;
+}
+
+static int spacemit_dwmac_fix_delay(struct plat_stmmacenet_data *plat_dat,
+ struct regmap *apmu,
+ unsigned int dline_offset,
+ unsigned int tx_delay, unsigned int rx_delay)
+{
+ bool mac_rxid = rx_delay != 0;
+ bool mac_txid = tx_delay != 0;
+ unsigned int rx_config = 0;
+ unsigned int tx_config = 0;
+ unsigned int rx_code;
+ unsigned int tx_code;
+
+ plat_dat->phy_interface = phy_fix_phy_mode_for_mac_delays(plat_dat->phy_interface,
+ mac_txid,
+ mac_rxid);
+
+ if (plat_dat->phy_interface == PHY_INTERFACE_MODE_NA)
+ return -EINVAL;
+
+ rx_code = spacemit_dwmac_detected_delay_value(rx_delay, &rx_config);
+ tx_code = spacemit_dwmac_detected_delay_value(tx_delay, &tx_config);
+
+ return spacemit_dwmac_set_delay(apmu, dline_offset,
+ tx_code, tx_config,
+ rx_code, rx_config);
+}
+
+static int spacemit_dwmac_update_ifconfig(struct plat_stmmacenet_data *plat_dat,
+ struct stmmac_resources *stmmac_res,
+ struct regmap *apmu,
+ unsigned int ctrl_offset)
+{
+ unsigned int mask = PHY_INTF_MII | PHY_INTF_RGMII | WAKE_IRQ_EN;
+ unsigned int val = 0;
+
+ switch (plat_dat->phy_interface) {
+ case PHY_INTERFACE_MODE_MII:
+ val |= PHY_INTF_MII;
+ break;
+
+ case PHY_INTERFACE_MODE_RMII:
+ break;
+
+ case PHY_INTERFACE_MODE_RGMII:
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ case PHY_INTERFACE_MODE_RGMII_RXID:
+ case PHY_INTERFACE_MODE_RGMII_TXID:
+ val |= PHY_INTF_RGMII;
+ break;
+
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ if (stmmac_res->wol_irq >= 0)
+ val |= WAKE_IRQ_EN;
+
+ return regmap_update_bits(apmu, ctrl_offset, mask, val);
+}
+
+static int spacemit_dwmac_probe(struct platform_device *pdev)
+{
+ struct plat_stmmacenet_data *plat_dat;
+ struct stmmac_resources stmmac_res;
+ struct device *dev = &pdev->dev;
+ unsigned int rx_delay = 0;
+ unsigned int tx_delay = 0;
+ struct regmap *apmu;
+ unsigned int offset[2];
+ int ret;
+
+ ret = stmmac_get_platform_resources(pdev, &stmmac_res);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "failed to get platform resources\n");
+
+ plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);
+ if (IS_ERR(plat_dat))
+ return dev_err_probe(dev, PTR_ERR(plat_dat),
+ "failed to parse DT parameters\n");
+
+ plat_dat->clk_tx_i = devm_clk_get_enabled(&pdev->dev, "tx");
+ if (IS_ERR(plat_dat->clk_tx_i))
+ return dev_err_probe(&pdev->dev, PTR_ERR(plat_dat->clk_tx_i),
+ "failed to get tx clock\n");
+
+ apmu = syscon_regmap_lookup_by_phandle_args(pdev->dev.of_node, "spacemit,apmu", 2, offset);
+ if (IS_ERR(apmu))
+ return dev_err_probe(dev, PTR_ERR(apmu),
+ "Failed to get apmu regmap\n");
+
+ ret = spacemit_dwmac_update_ifconfig(plat_dat, &stmmac_res,
+ apmu, offset[0]);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to configure ifconfig\n");
+
+ of_property_read_u32(pdev->dev.of_node, "tx-internal-delay-ps", &tx_delay);
+ of_property_read_u32(pdev->dev.of_node, "rx-internal-delay-ps", &rx_delay);
+
+ ret = spacemit_dwmac_fix_delay(plat_dat, apmu, offset[1], tx_delay, rx_delay);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to configure delay\n");
+
+ return stmmac_dvr_probe(dev, plat_dat, &stmmac_res);
+}
+
+static const struct of_device_id spacemit_dwmac_match[] = {
+ { .compatible = "spacemit,k3-dwmac" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, spacemit_dwmac_match);
+
+static struct platform_driver spacemit_dwmac_driver = {
+ .probe = spacemit_dwmac_probe,
+ .remove = stmmac_pltfr_remove,
+ .driver = {
+ .name = "spacemit-dwmac",
+ .pm = &stmmac_pltfr_pm_ops,
+ .of_match_table = spacemit_dwmac_match,
+ },
+};
+module_platform_driver(spacemit_dwmac_driver);
+
+MODULE_AUTHOR("Inochi Amaoto <inochiama@...il.com>");
+MODULE_DESCRIPTION("Spacemit DWMAC platform driver");
+MODULE_LICENSE("GPL");
--
2.52.0
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