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// SPDX-License-Identifier: GPL-2.0+
/*
* Spacemit DWMAC platform driver
*
* Copyright (C) 2026 Inochi Amaoto <inochiama@gmail.com>
*/
#include <linux/clk.h>
#include <linux/math.h>
#include <linux/module.h>
#include <linux/mfd/syscon.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 CTRL_PHY_INTF_MODE GENMASK(4, 3)
#define CTRL_PHY_INTF_RMII FIELD_PREP(CTRL_PHY_INTF_MODE, 0)
#define CTRL_PHY_INTF_RGMII FIELD_PREP(CTRL_PHY_INTF_MODE, 1)
#define CTRL_PHY_INTF_MII FIELD_PREP(CTRL_PHY_INTF_MODE, 3)
#define CTRL_LPI_IRQ_EN BIT(9)
#define CTRL_WAKE_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
#define MAX_WORKED_DELAY 2800
/* Note: the delay step value is at 0.1ps */
#define K3_DELAY_STEP 367
struct spacmit_dwmac {
struct regmap *apmu;
unsigned int ctrl_offset;
unsigned int dline_offset;
};
static int spacemit_dwmac_set_delay(struct spacmit_dwmac *dwmac,
unsigned int tx_code, unsigned int rx_code)
{
unsigned int mask, val;
mask = RGMII_TX_DLINE_STEP | RGMII_TX_DLINE_CODE | RGMII_TX_DLINE_EN |
RGMII_RX_DLINE_STEP | RGMII_RX_DLINE_CODE | RGMII_RX_DLINE_EN;
/*
* Since the delay step provided by config 0 is small enough, and
* it can cover the range of the valid delay, so there is no needed
* to use other step config.
*/
val = FIELD_PREP(RGMII_TX_DLINE_STEP, 0) |
FIELD_PREP(RGMII_TX_DLINE_CODE, tx_code) | RGMII_TX_DLINE_EN |
FIELD_PREP(RGMII_RX_DLINE_STEP, 0) |
FIELD_PREP(RGMII_RX_DLINE_CODE, rx_code) | RGMII_RX_DLINE_EN;
return regmap_update_bits(dwmac->apmu, dwmac->dline_offset,
mask, val);
}
static int spacemit_dwmac_detected_delay_value(unsigned int delay)
{
if (delay == 0)
return 0;
if (delay > MAX_WORKED_DELAY)
return -EINVAL;
/*
* 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
*/
return DIV_ROUND_CLOSEST(delay * 10 * 10, K3_DELAY_STEP * 9);
}
static int spacemit_dwmac_fix_delay(struct spacmit_dwmac *dwmac,
unsigned int tx_delay,
unsigned int rx_delay)
{
int rx_code;
int tx_code;
rx_code = spacemit_dwmac_detected_delay_value(rx_delay);
if (rx_code < 0)
return rx_code;
tx_code = spacemit_dwmac_detected_delay_value(tx_delay);
if (tx_code < 0)
return tx_code;
return spacemit_dwmac_set_delay(dwmac, tx_code, rx_code);
}
static int spacemit_dwmac_update_irq_config(struct spacmit_dwmac *dwmac,
struct stmmac_resources *stmmac_res)
{
unsigned int val = stmmac_res->wol_irq >= 0 ? CTRL_WAKE_IRQ_EN : 0;
unsigned int mask = CTRL_WAKE_IRQ_EN;
return regmap_update_bits(dwmac->apmu, dwmac->ctrl_offset,
mask, val);
}
static void spacemit_get_interfaces(struct stmmac_priv *priv, void *bsp_priv,
unsigned long *interfaces)
{
__set_bit(PHY_INTERFACE_MODE_MII, interfaces);
__set_bit(PHY_INTERFACE_MODE_RMII, interfaces);
phy_interface_set_rgmii(interfaces);
}
static int spacemit_set_phy_intf_sel(void *bsp_priv, u8 phy_intf_sel)
{
unsigned int mask = CTRL_PHY_INTF_MODE;
struct spacmit_dwmac *dwmac = bsp_priv;
unsigned int val = 0;
switch (phy_intf_sel) {
case PHY_INTF_SEL_GMII_MII:
val = CTRL_PHY_INTF_MII;
break;
case PHY_INTF_SEL_RMII:
val = CTRL_PHY_INTF_RMII;
break;
case PHY_INTF_SEL_RGMII:
val = CTRL_PHY_INTF_RGMII;
break;
default:
return -EINVAL;
}
return regmap_update_bits(dwmac->apmu, dwmac->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;
struct spacmit_dwmac *dwmac;
unsigned int offset[2];
struct regmap *apmu;
struct clk *clk_tx;
u32 rx_delay = 0;
u32 tx_delay = 0;
int ret;
ret = stmmac_get_platform_resources(pdev, &stmmac_res);
if (ret)
return dev_err_probe(dev, ret,
"failed to get platform resources\n");
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(dev, PTR_ERR(plat_dat),
"failed to parse DT parameters\n");
clk_tx = devm_clk_get_enabled(&pdev->dev, "tx");
if (IS_ERR(clk_tx))
return dev_err_probe(&pdev->dev, PTR_ERR(clk_tx),
"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");
dwmac->apmu = apmu;
dwmac->ctrl_offset = offset[0];
dwmac->dline_offset = offset[1];
ret = spacemit_dwmac_update_irq_config(dwmac, &stmmac_res);
if (ret)
return dev_err_probe(dev, ret, "Failed to configure irq config\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);
plat_dat->get_interfaces = spacemit_get_interfaces;
plat_dat->set_phy_intf_sel = spacemit_set_phy_intf_sel;
plat_dat->bsp_priv = dwmac;
ret = spacemit_dwmac_fix_delay(dwmac, 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@gmail.com>");
MODULE_DESCRIPTION("Spacemit DWMAC platform driver");
MODULE_LICENSE("GPL");
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