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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/of.h>
#include <linux/pcs-rzn1-miic.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/types.h>
#include "stmmac_platform.h"
/**
* struct renesas_gbeth_of_data - OF data for Renesas GBETH
*
* @clks: Array of clock names
* @num_clks: Number of clocks
* @stmmac_flags: Flags for the stmmac driver
* @handle_reset: Flag to indicate if reset control is
* handled by the glue driver or core driver.
* @set_clk_tx_rate: Flag to indicate if Tx clock is fixed or
* set_clk_tx_rate is needed.
* @has_pcs: Flag to indicate if the MAC has a PCS
*/
struct renesas_gbeth_of_data {
const char * const *clks;
u8 num_clks;
u32 stmmac_flags;
bool handle_reset;
bool set_clk_tx_rate;
bool has_pcs;
};
struct renesas_gbeth {
const struct renesas_gbeth_of_data *of_data;
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 const char *const renesas_gmac_clks[] = {
"tx",
};
static int renesas_gmac_pcs_init(struct stmmac_priv *priv)
{
struct device_node *np = priv->device->of_node;
struct device_node *pcs_node;
struct phylink_pcs *pcs;
pcs_node = of_parse_phandle(np, "pcs-handle", 0);
if (pcs_node) {
pcs = miic_create(priv->device, pcs_node);
of_node_put(pcs_node);
if (IS_ERR(pcs))
return PTR_ERR(pcs);
priv->hw->phylink_pcs = pcs;
}
return 0;
}
static void renesas_gmac_pcs_exit(struct stmmac_priv *priv)
{
if (priv->hw->phylink_pcs)
miic_destroy(priv->hw->phylink_pcs);
}
static struct phylink_pcs *renesas_gmac_select_pcs(struct stmmac_priv *priv,
phy_interface_t interface)
{
return priv->hw->phylink_pcs;
}
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)
{
const struct renesas_gbeth_of_data *of_data;
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;
of_data = of_device_get_match_data(&pdev->dev);
gbeth->of_data = of_data;
plat_dat->num_clks = of_data->num_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 = of_data->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");
if (of_data->handle_reset) {
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;
if (of_data->set_clk_tx_rate)
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_EN_TX_LPI_CLK_PHY_CAP |
gbeth->of_data->stmmac_flags;
if (of_data->has_pcs) {
plat_dat->pcs_init = renesas_gmac_pcs_init;
plat_dat->pcs_exit = renesas_gmac_pcs_exit;
plat_dat->select_pcs = renesas_gmac_select_pcs;
}
return devm_stmmac_pltfr_probe(pdev, plat_dat, &stmmac_res);
}
static const struct renesas_gbeth_of_data renesas_gbeth_of_data = {
.clks = renesas_gbeth_clks,
.num_clks = ARRAY_SIZE(renesas_gbeth_clks),
.handle_reset = true,
.set_clk_tx_rate = true,
.stmmac_flags = STMMAC_FLAG_HWTSTAMP_CORRECT_LATENCY |
STMMAC_FLAG_SPH_DISABLE,
};
static const struct renesas_gbeth_of_data renesas_gmac_of_data = {
.clks = renesas_gmac_clks,
.num_clks = ARRAY_SIZE(renesas_gmac_clks),
.stmmac_flags = STMMAC_FLAG_HWTSTAMP_CORRECT_LATENCY,
.has_pcs = true,
};
static const struct of_device_id renesas_gbeth_match[] = {
{ .compatible = "renesas,r9a09g077-gbeth", .data = &renesas_gmac_of_data },
{ .compatible = "renesas,rzv2h-gbeth", .data = &renesas_gbeth_of_data },
{ /* Sentinel */ }
};
MODULE_DEVICE_TABLE(of, renesas_gbeth_match);
static struct platform_driver renesas_gbeth_driver = {
.probe = renesas_gbeth_probe,
.driver = {
.name = "renesas-gbeth",
.pm = &stmmac_pltfr_pm_ops,
.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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