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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Loongson-1 DWMAC glue layer
*
* Copyright (C) 2011-2023 Keguang Zhang <keguang.zhang@gmail.com>
*/
#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 = devm_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;
return devm_stmmac_pltfr_probe(pdev, plat_dat, &stmmac_res);
}
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,
.driver = {
.name = "loongson1-dwmac",
.of_match_table = ls1x_dwmac_match,
},
};
module_platform_driver(ls1x_dwmac_driver);
MODULE_AUTHOR("Keguang Zhang <keguang.zhang@gmail.com>");
MODULE_DESCRIPTION("Loongson-1 DWMAC glue layer");
MODULE_LICENSE("GPL");
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