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/*
* starfive DWMAC platform driver
*
* Copyright (C) 2007-2011 STMicroelectronics Ltd
* Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include "stmmac.h"
#include "stmmac_platform.h"
struct starfive_priv_data {
struct device *dev;
struct clk *clk_ahb;
struct clk *clk_gtx;
struct plat_stmmacenet_data *plat_dat;
};
static void starfive_dwmac_fixe_speed(void *priv, unsigned int speed)
{
struct starfive_priv_data *dwmac = priv;
unsigned long rate;
int err;
/*0x118001ec地址为mac的时钟分频寄存器，低8位为分频值
*mac的root时钟为500M,gtxclk需求的时钟如下：
*1000M: gtxclk为125M，分频值为500/125=0x4
*100M: gtxclk为25M，分频值为500/25=0x14
*10M:gtxclk为2.5M，分频值为500/2.5=0xc8*/
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 %u\n", speed);
return;
}
err = clk_set_rate(dwmac->clk_gtx, rate);
if (err < 0)
dev_err(dwmac->dev, "failed to set tx rate %lu\n", rate);
}
static int starfive_dwmac_init(struct platform_device *pdev, void *priv)
{
struct starfive_priv_data *dwmac = priv;
int ret;
ret = clk_prepare_enable(dwmac->clk_ahb);
if (ret) {
dev_err(&pdev->dev, "gmac ahb clock enable failed\n");
return ret;
}
ret = clk_prepare_enable(dwmac->clk_gtx);
if (ret) {
dev_err(&pdev->dev, "gmac tx clock enable failed\n");
goto clk_tx_en_failed;
}
return 0;
clk_tx_en_failed:
clk_disable_unprepare(dwmac->clk_ahb);
return ret;
}
static void starfive_dwmac_exit(struct platform_device *pdev, void *priv)
{
struct starfive_priv_data *dwmac = priv;
clk_disable_unprepare(dwmac->clk_ahb);
clk_disable_unprepare(dwmac->clk_gtx);
}
static int starfive_dwmac_parse_dt(struct starfive_priv_data *dwmac, struct device *dev)
{
struct device_node *np = dev->of_node;
int err = 0;
dwmac->clk_ahb = devm_clk_get(dev, "gmac_ahb");
if (IS_ERR(dwmac->clk_ahb)) {
dev_err(dev, "failed to get gmac ahb clock\n");
return PTR_ERR(dwmac->clk_ahb);
}
dwmac->clk_gtx = devm_clk_get(dev, "gmac_gtx");
if (IS_ERR(dwmac->clk_gtx)) {
dev_err(dev, "failed to get gmac tx clock\n");
return PTR_ERR(dwmac->clk_gtx);
}
return err;
}
static int dwmac_starfive_probe(struct platform_device *pdev)
{
struct plat_stmmacenet_data *plat_dat;
struct stmmac_resources stmmac_res;
struct starfive_priv_data *dwmac;
int ret;
ret = stmmac_get_platform_resources(pdev, &stmmac_res);
if (ret)
return ret;
dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
if (!dwmac)
return -ENOMEM;
plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
if (IS_ERR(plat_dat))
return PTR_ERR(plat_dat);
dwmac->dev = &pdev->dev;
ret = starfive_dwmac_parse_dt(dwmac, &pdev->dev);
if (ret) {
dev_err(&pdev->dev, "failed to parse OF data\n");
goto err_remove_config_dt;
}
plat_dat->init = starfive_dwmac_init;
plat_dat->exit = starfive_dwmac_exit;
plat_dat->fix_mac_speed = starfive_dwmac_fixe_speed;
plat_dat->bsp_priv = dwmac;
dwmac->plat_dat = plat_dat;
ret = starfive_dwmac_init(pdev, dwmac);
if (ret)
goto err_remove_config_dt;
ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
if (ret)
goto err_exit;
return 0;
err_exit:
starfive_dwmac_exit(pdev, plat_dat->bsp_priv);
err_remove_config_dt:
if (pdev->dev.of_node)
stmmac_remove_config_dt(pdev, plat_dat);
return ret;
}
static const struct of_device_id dwmac_starfive_match[] = {
{ .compatible = "snps,dwmac"},
{ }
};
MODULE_DEVICE_TABLE(of, dwmac_starfive_match);
static struct platform_driver dwmac_starfive_driver = {
.probe = dwmac_starfive_probe,
.remove = stmmac_pltfr_remove,
.driver = {
.name = STMMAC_RESOURCE_NAME,
.pm = &stmmac_pltfr_pm_ops,
.of_match_table = of_match_ptr(dwmac_starfive_match),
},
};
module_platform_driver(dwmac_starfive_driver);
MODULE_DESCRIPTION("starfive dwmac driver");
MODULE_LICENSE("GPL v2");
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