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// SPDX-License-Identifier: GPL-2.0
/* Intel DWMAC platform driver
*
* Copyright(C) 2020 Intel Corporation
*/
#include <linux/ethtool.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/stmmac.h>
#include "dwmac4.h"
#include "stmmac.h"
#include "stmmac_platform.h"
struct intel_dwmac {
struct device *dev;
struct clk *tx_clk;
const struct intel_dwmac_data *data;
};
struct intel_dwmac_data {
void (*fix_mac_speed)(void *priv, unsigned int speed, unsigned int mode);
unsigned long ptp_ref_clk_rate;
unsigned long tx_clk_rate;
bool tx_clk_en;
};
static void kmb_eth_fix_mac_speed(void *priv, unsigned int speed, unsigned int mode)
{
struct intel_dwmac *dwmac = priv;
unsigned long rate;
int ret;
rate = clk_get_rate(dwmac->tx_clk);
switch (speed) {
case SPEED_1000:
rate = 125000000;
break;
case SPEED_100:
rate = 25000000;
break;
case SPEED_10:
rate = 2500000;
break;
default:
dev_err(dwmac->dev, "Invalid speed\n");
break;
}
ret = clk_set_rate(dwmac->tx_clk, rate);
if (ret)
dev_err(dwmac->dev, "Failed to configure tx clock rate\n");
}
static const struct intel_dwmac_data kmb_data = {
.fix_mac_speed = kmb_eth_fix_mac_speed,
.ptp_ref_clk_rate = 200000000,
.tx_clk_rate = 125000000,
.tx_clk_en = true,
};
static const struct of_device_id intel_eth_plat_match[] = {
{ .compatible = "intel,keembay-dwmac", .data = &kmb_data },
{ }
};
MODULE_DEVICE_TABLE(of, intel_eth_plat_match);
static int intel_eth_plat_probe(struct platform_device *pdev)
{
struct plat_stmmacenet_data *plat_dat;
struct stmmac_resources stmmac_res;
struct intel_dwmac *dwmac;
unsigned long rate;
int ret;
ret = stmmac_get_platform_resources(pdev, &stmmac_res);
if (ret)
return ret;
plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);
if (IS_ERR(plat_dat)) {
dev_err(&pdev->dev, "dt configuration failed\n");
return PTR_ERR(plat_dat);
}
dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
if (!dwmac)
return -ENOMEM;
dwmac->dev = &pdev->dev;
dwmac->tx_clk = NULL;
dwmac->data = device_get_match_data(&pdev->dev);
if (dwmac->data) {
if (dwmac->data->fix_mac_speed)
plat_dat->fix_mac_speed = dwmac->data->fix_mac_speed;
/* Enable TX clock */
if (dwmac->data->tx_clk_en) {
dwmac->tx_clk = devm_clk_get(&pdev->dev, "tx_clk");
if (IS_ERR(dwmac->tx_clk))
return PTR_ERR(dwmac->tx_clk);
ret = clk_prepare_enable(dwmac->tx_clk);
if (ret) {
dev_err(&pdev->dev,
"Failed to enable tx_clk\n");
return ret;
}
/* Check and configure TX clock rate */
rate = clk_get_rate(dwmac->tx_clk);
if (dwmac->data->tx_clk_rate &&
rate != dwmac->data->tx_clk_rate) {
rate = dwmac->data->tx_clk_rate;
ret = clk_set_rate(dwmac->tx_clk, rate);
if (ret) {
dev_err(&pdev->dev,
"Failed to set tx_clk\n");
goto err_tx_clk_disable;
}
}
}
/* Check and configure PTP ref clock rate */
rate = clk_get_rate(plat_dat->clk_ptp_ref);
if (dwmac->data->ptp_ref_clk_rate &&
rate != dwmac->data->ptp_ref_clk_rate) {
rate = dwmac->data->ptp_ref_clk_rate;
ret = clk_set_rate(plat_dat->clk_ptp_ref, rate);
if (ret) {
dev_err(&pdev->dev,
"Failed to set clk_ptp_ref\n");
goto err_tx_clk_disable;
}
}
}
plat_dat->bsp_priv = dwmac;
plat_dat->eee_usecs_rate = plat_dat->clk_ptp_rate;
if (plat_dat->eee_usecs_rate > 0) {
u32 tx_lpi_usec;
tx_lpi_usec = (plat_dat->eee_usecs_rate / 1000000) - 1;
writel(tx_lpi_usec, stmmac_res.addr + GMAC_1US_TIC_COUNTER);
}
ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
if (ret)
goto err_tx_clk_disable;
return 0;
err_tx_clk_disable:
if (dwmac->data->tx_clk_en)
clk_disable_unprepare(dwmac->tx_clk);
return ret;
}
static void intel_eth_plat_remove(struct platform_device *pdev)
{
struct intel_dwmac *dwmac = get_stmmac_bsp_priv(&pdev->dev);
stmmac_pltfr_remove(pdev);
if (dwmac->data->tx_clk_en)
clk_disable_unprepare(dwmac->tx_clk);
}
static struct platform_driver intel_eth_plat_driver = {
.probe = intel_eth_plat_probe,
.remove_new = intel_eth_plat_remove,
.driver = {
.name = "intel-eth-plat",
.pm = &stmmac_pltfr_pm_ops,
.of_match_table = intel_eth_plat_match,
},
};
module_platform_driver(intel_eth_plat_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Intel DWMAC platform driver");
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