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// SPDX-License-Identifier: GPL-2.0+
/*
* dwmac-renesas-gbeth.c - DWMAC Specific Glue layer for Renesas GBETH
*
* The Rx and Tx clocks are supplied as follows for the GBETH IP.
*
* Rx / Tx
* -------+------------- on / off -------
* |
* | Rx-180 / Tx-180
* +---- not ---- on / off -------
*
* Copyright (C) 2025 Renesas Electronics Corporation
*/
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include "stmmac_platform.h"
struct renesas_gbeth {
struct plat_stmmacenet_data *plat_dat;
struct reset_control *rstc;
struct device *dev;
};
static const char *const renesas_gbeth_clks[] = {
"tx", "tx-180", "rx", "rx-180",
};
static int renesas_gbeth_init(struct platform_device *pdev, void *priv)
{
struct plat_stmmacenet_data *plat_dat;
struct renesas_gbeth *gbeth = priv;
int ret;
plat_dat = gbeth->plat_dat;
ret = reset_control_deassert(gbeth->rstc);
if (ret) {
dev_err(gbeth->dev, "Reset deassert failed\n");
return ret;
}
ret = clk_bulk_prepare_enable(plat_dat->num_clks,
plat_dat->clks);
if (ret)
reset_control_assert(gbeth->rstc);
return ret;
}
static void renesas_gbeth_exit(struct platform_device *pdev, void *priv)
{
struct plat_stmmacenet_data *plat_dat;
struct renesas_gbeth *gbeth = priv;
int ret;
plat_dat = gbeth->plat_dat;
clk_bulk_disable_unprepare(plat_dat->num_clks, plat_dat->clks);
ret = reset_control_assert(gbeth->rstc);
if (ret)
dev_err(gbeth->dev, "Reset assert failed\n");
}
static int renesas_gbeth_probe(struct platform_device *pdev)
{
struct plat_stmmacenet_data *plat_dat;
struct stmmac_resources stmmac_res;
struct device *dev = &pdev->dev;
struct renesas_gbeth *gbeth;
unsigned int i;
int err;
err = stmmac_get_platform_resources(pdev, &stmmac_res);
if (err)
return dev_err_probe(dev, err,
"failed to get 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),
"dt configuration failed\n");
gbeth = devm_kzalloc(dev, sizeof(*gbeth), GFP_KERNEL);
if (!gbeth)
return -ENOMEM;
plat_dat->num_clks = ARRAY_SIZE(renesas_gbeth_clks);
plat_dat->clks = devm_kcalloc(dev, plat_dat->num_clks,
sizeof(*plat_dat->clks), GFP_KERNEL);
if (!plat_dat->clks)
return -ENOMEM;
for (i = 0; i < plat_dat->num_clks; i++)
plat_dat->clks[i].id = renesas_gbeth_clks[i];
err = devm_clk_bulk_get(dev, plat_dat->num_clks, plat_dat->clks);
if (err < 0)
return err;
plat_dat->clk_tx_i = stmmac_pltfr_find_clk(plat_dat, "tx");
if (!plat_dat->clk_tx_i)
return dev_err_probe(dev, -EINVAL,
"error finding tx clock\n");
gbeth->rstc = devm_reset_control_get_exclusive(dev, NULL);
if (IS_ERR(gbeth->rstc))
return PTR_ERR(gbeth->rstc);
gbeth->dev = dev;
gbeth->plat_dat = plat_dat;
plat_dat->bsp_priv = gbeth;
plat_dat->set_clk_tx_rate = stmmac_set_clk_tx_rate;
plat_dat->init = renesas_gbeth_init;
plat_dat->exit = renesas_gbeth_exit;
plat_dat->flags |= STMMAC_FLAG_HWTSTAMP_CORRECT_LATENCY |
STMMAC_FLAG_EN_TX_LPI_CLK_PHY_CAP |
STMMAC_FLAG_SPH_DISABLE;
return devm_stmmac_pltfr_probe(pdev, plat_dat, &stmmac_res);
}
static const struct of_device_id renesas_gbeth_match[] = {
{ .compatible = "renesas,rzv2h-gbeth", },
{ /* Sentinel */ }
};
MODULE_DEVICE_TABLE(of, renesas_gbeth_match);
static struct platform_driver renesas_gbeth_driver = {
.probe = renesas_gbeth_probe,
.driver = {
.name = "renesas-gbeth",
.of_match_table = renesas_gbeth_match,
},
};
module_platform_driver(renesas_gbeth_driver);
MODULE_AUTHOR("Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>");
MODULE_DESCRIPTION("Renesas GBETH DWMAC Specific Glue layer");
MODULE_LICENSE("GPL");
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