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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Maxime Coquelin , Alexandre Torgue , Richard Cochran , Philipp Zabel , Geert Uytterhoeven , Magnus Damm , "Russell King (Oracle)" , Giuseppe Cavallaro , Jose Abreu Cc: netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-renesas-soc@vger.kernel.org, Prabhakar , Biju Das , Fabrizio Castro , Lad Prabhakar Subject: [PATCH net-next v5 3/3] net: stmmac: Add DWMAC glue layer for Renesas GBETH Date: Mon, 7 Apr 2025 13:03:17 +0100 Message-ID: <20250407120317.127056-4-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250407120317.127056-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20250407120317.127056-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Lad Prabhakar Add the DWMAC glue layer for the GBETH IP found in the Renesas RZ/V2H(P) SoC. Signed-off-by: Lad Prabhakar --- v4->v5 - No change v3->v4 - Maintained reverse christmas tree order in renesas_gbeth_clks_config - Returned err in case of success in renesas_gbeth_probe() v2->v3 - Handle clks from plat_dat - Replaced STMMAC_FLAG_EN_TX_LPI_CLOCKGATING flag with STMMAC_FLAG_EN_TX_LPI_CLK_PHY_CAP. v1->v2 - Dropped __initconst for renesas_gbeth_clks array - Added clks_config callback - Dropped STMMAC_FLAG_RX_CLK_RUNS_IN_LPI flag as this needs investigation. --- drivers/net/ethernet/stmicro/stmmac/Kconfig | 11 ++ drivers/net/ethernet/stmicro/stmmac/Makefile | 1 + .../stmicro/stmmac/dwmac-renesas-gbeth.c | 165 ++++++++++++++++++ 3 files changed, 177 insertions(+) create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth= .c diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethe= rnet/stmicro/stmmac/Kconfig index 3c820ef56775..2c99b23f0faa 100644 --- a/drivers/net/ethernet/stmicro/stmmac/Kconfig +++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig @@ -131,6 +131,17 @@ config DWMAC_QCOM_ETHQOS This selects the Qualcomm ETHQOS glue layer support for the stmmac device driver. =20 +config DWMAC_RENESAS_GBETH + tristate "Renesas RZ/V2H(P) GBETH support" + default ARCH_RENESAS + depends on OF && (ARCH_RENESAS || COMPILE_TEST) + help + Support for Gigabit Ethernet Interface (GBETH) on Renesas + RZ/V2H(P) SoCs. + + This selects the Renesas RZ/V2H(P) Soc specific glue layer support + for the stmmac device driver. + config DWMAC_ROCKCHIP tristate "Rockchip dwmac support" default ARCH_ROCKCHIP diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/eth= ernet/stmicro/stmmac/Makefile index 594883fb4164..91050215511b 100644 --- a/drivers/net/ethernet/stmicro/stmmac/Makefile +++ b/drivers/net/ethernet/stmicro/stmmac/Makefile @@ -20,6 +20,7 @@ obj-$(CONFIG_DWMAC_LPC18XX) +=3D dwmac-lpc18xx.o obj-$(CONFIG_DWMAC_MEDIATEK) +=3D dwmac-mediatek.o obj-$(CONFIG_DWMAC_MESON) +=3D dwmac-meson.o dwmac-meson8b.o obj-$(CONFIG_DWMAC_QCOM_ETHQOS) +=3D dwmac-qcom-ethqos.o +obj-$(CONFIG_DWMAC_RENESAS_GBETH) +=3D dwmac-renesas-gbeth.o obj-$(CONFIG_DWMAC_ROCKCHIP) +=3D dwmac-rk.o obj-$(CONFIG_DWMAC_RZN1) +=3D dwmac-rzn1.o obj-$(CONFIG_DWMAC_S32) +=3D dwmac-s32.o diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c b/dr= ivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c new file mode 100644 index 000000000000..a0f7cacea810 --- /dev/null +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c @@ -0,0 +1,165 @@ +// 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 +#include +#include +#include +#include + +#include "dwmac4.h" +#include "stmmac_platform.h" + +struct renesas_gbeth { + struct plat_stmmacenet_data *plat_dat; + struct reset_control *rstc; + struct device *dev; + void __iomem *regs; +}; + +static const char *const renesas_gbeth_clks[] =3D { + "tx", "tx-180", "rx", "rx-180", +}; + +static struct clk *renesas_gbeth_find_clk(struct plat_stmmacenet_data *pla= t_dat, + const char *name) +{ + for (unsigned int i =3D 0; i < plat_dat->num_clks; i++) + if (!strcmp(plat_dat->clks[i].id, name)) + return plat_dat->clks[i].clk; + + return NULL; +} + +static int renesas_gbeth_clks_config(void *priv, bool enabled) +{ + struct plat_stmmacenet_data *plat_dat; + struct renesas_gbeth *gbeth =3D priv; + int ret; + + plat_dat =3D gbeth->plat_dat; + if (enabled) { + ret =3D reset_control_deassert(gbeth->rstc); + if (ret) { + dev_err(gbeth->dev, "Reset deassert failed\n"); + return ret; + } + + ret =3D clk_bulk_prepare_enable(plat_dat->num_clks, plat_dat->clks); + if (ret) + reset_control_assert(gbeth->rstc); + } else { + clk_bulk_disable_unprepare(plat_dat->num_clks, plat_dat->clks); + ret =3D reset_control_assert(gbeth->rstc); + if (ret) + dev_err(gbeth->dev, "Reset assert failed\n"); + } + + return ret; +} + +static int renesas_gbeth_probe(struct platform_device *pdev) +{ + struct plat_stmmacenet_data *plat_dat; + struct stmmac_resources stmmac_res; + struct device *dev =3D &pdev->dev; + struct renesas_gbeth *gbeth; + unsigned int i; + int err; + + err =3D stmmac_get_platform_resources(pdev, &stmmac_res); + if (err) + return dev_err_probe(dev, err, + "failed to get resources\n"); + + plat_dat =3D 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 =3D devm_kzalloc(dev, sizeof(*gbeth), GFP_KERNEL); + if (!gbeth) + return -ENOMEM; + + plat_dat->num_clks =3D ARRAY_SIZE(renesas_gbeth_clks); + plat_dat->clks =3D devm_kcalloc(dev, plat_dat->num_clks, + sizeof(*plat_dat->clks), GFP_KERNEL); + if (!plat_dat->clks) + return -ENOMEM; + + for (i =3D 0; i < plat_dat->num_clks; i++) + plat_dat->clks[i].id =3D renesas_gbeth_clks[i]; + + err =3D devm_clk_bulk_get(dev, plat_dat->num_clks, plat_dat->clks); + if (err < 0) + return err; + + plat_dat->clk_tx_i =3D renesas_gbeth_find_clk(plat_dat, "tx"); + if (!plat_dat->clk_tx_i) + return dev_err_probe(dev, -EINVAL, + "error finding tx clock\n"); + + gbeth->rstc =3D devm_reset_control_get_exclusive(dev, NULL); + if (IS_ERR(gbeth->rstc)) + return PTR_ERR(gbeth->rstc); + + gbeth->dev =3D dev; + gbeth->regs =3D stmmac_res.addr; + gbeth->plat_dat =3D plat_dat; + plat_dat->bsp_priv =3D gbeth; + plat_dat->set_clk_tx_rate =3D stmmac_set_clk_tx_rate; + plat_dat->clks_config =3D renesas_gbeth_clks_config; + plat_dat->flags |=3D STMMAC_FLAG_HWTSTAMP_CORRECT_LATENCY | + STMMAC_FLAG_EN_TX_LPI_CLK_PHY_CAP | + STMMAC_FLAG_SPH_DISABLE; + + err =3D renesas_gbeth_clks_config(gbeth, true); + if (err) + return err; + + err =3D stmmac_dvr_probe(dev, plat_dat, &stmmac_res); + if (err) + renesas_gbeth_clks_config(gbeth, false); + + return err; +} + +static void renesas_gbeth_remove(struct platform_device *pdev) +{ + stmmac_dvr_remove(&pdev->dev); + + renesas_gbeth_clks_config(get_stmmac_bsp_priv(&pdev->dev), false); +} + +static const struct of_device_id renesas_gbeth_match[] =3D { + { .compatible =3D "renesas,rzv2h-gbeth", }, + { /* Sentinel */ } +}; +MODULE_DEVICE_TABLE(of, renesas_gbeth_match); + +static struct platform_driver renesas_gbeth_driver =3D { + .probe =3D renesas_gbeth_probe, + .remove =3D renesas_gbeth_remove, + .driver =3D { + .name =3D "renesas-gbeth", + .pm =3D &stmmac_pltfr_pm_ops, + .of_match_table =3D renesas_gbeth_match, + }, +}; +module_platform_driver(renesas_gbeth_driver); + +MODULE_AUTHOR("Lad Prabhakar "); +MODULE_DESCRIPTION("Renesas GBETH DWMAC Specific Glue layer"); +MODULE_LICENSE("GPL"); --=20 2.49.0