Re: [PATCH v4 5/7] net: stmmac: Add glue layer for StarFive JH7110 SoCs

[Emil Renner Berthing <emil.renner.berthing@canonical.com>]

On Wed, 18 Jan 2023 at 07:20, Yanhong Wang
<yanhong.wang@starfivetech.com> wrote:
>
> This adds StarFive dwmac driver support on the StarFive JH7110 SoCs.
>
> Signed-off-by: Yanhong Wang <yanhong.wang@starfivetech.com>
> Co-developed-by: Emil Renner Berthing <kernel@esmil.dk>
> Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
> ---
>  MAINTAINERS                                   |   1 +
>  drivers/net/ethernet/stmicro/stmmac/Kconfig   |  12 ++
>  drivers/net/ethernet/stmicro/stmmac/Makefile  |   1 +
>  .../stmicro/stmmac/dwmac-starfive-plat.c      | 118 ++++++++++++++++++
>  4 files changed, 132 insertions(+)
>  create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-starfive-plat.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 56be59bb09f7..5b50b52d3dbb 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -19609,6 +19609,7 @@ F:      include/dt-bindings/clock/starfive*
>  STARFIVE DWMAC GLUE LAYER
>  M:     Yanhong Wang <yanhong.wang@starfivetech.com>
>  S:     Maintained
> +F:     Documentation/devicetree/bindings/net/dwmac-starfive-plat.c
>  F:     Documentation/devicetree/bindings/net/starfive,jh7110-dwmac.yaml
>
>  STARFIVE PINCTRL DRIVER
> diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
> index 31ff35174034..f9a4ad4abd54 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
> +++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
> @@ -235,6 +235,18 @@ config DWMAC_INTEL_PLAT
>           the stmmac device driver. This driver is used for the Intel Keem Bay
>           SoC.
>
> +config DWMAC_STARFIVE_PLAT
> +       tristate "StarFive dwmac support"
> +       depends on OF && COMMON_CLK
> +       depends on STMMAC_ETH
> +       default SOC_STARFIVE
> +       help
> +         Support for ethernet controllers on StarFive RISC-V SoCs
> +
> +         This selects the StarFive platform specific glue layer support for
> +         the stmmac device driver. This driver is used for StarFive JH7110
> +         ethernet controller.
> +
>  config DWMAC_VISCONTI
>         tristate "Toshiba Visconti DWMAC support"
>         default ARCH_VISCONTI
> diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
> index d4e12e9ace4f..a63ab0ab5071 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/Makefile
> +++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
> @@ -31,6 +31,7 @@ obj-$(CONFIG_DWMAC_DWC_QOS_ETH)       += dwmac-dwc-qos-eth.o
>  obj-$(CONFIG_DWMAC_INTEL_PLAT) += dwmac-intel-plat.o
>  obj-$(CONFIG_DWMAC_GENERIC)    += dwmac-generic.o
>  obj-$(CONFIG_DWMAC_IMX8)       += dwmac-imx.o
> +obj-$(CONFIG_DWMAC_STARFIVE_PLAT)      += dwmac-starfive-plat.o

Hi Yanhong,

For the next version could you please drop the _PLAT from the config
symbol and -plat from filename. I know the intel wrapper does the
same, but it's the only one, so lets do like the majority of other
wrappers and not add more different ways of doing things.

>  obj-$(CONFIG_DWMAC_VISCONTI)   += dwmac-visconti.o
>  stmmac-platform-objs:= stmmac_platform.o
>  dwmac-altr-socfpga-objs := altr_tse_pcs.o dwmac-socfpga.o
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive-plat.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive-plat.c
> new file mode 100644
> index 000000000000..e441d920933a
> --- /dev/null
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive-plat.c
> @@ -0,0 +1,118 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * StarFive DWMAC platform driver
> + *
> + * Copyright(C) 2022 StarFive Technology Co., Ltd.
> + *
> + */
> +
> +#include <linux/of_device.h>
> +
> +#include "stmmac_platform.h"
> +
> +struct starfive_dwmac {
> +       struct device *dev;
> +       struct clk *clk_tx;
> +       struct clk *clk_gtx;
> +       struct clk *clk_gtxc;
> +};

I like this name. For the next version could you also
s/starfive_eth_plat_/starfive_dwmac_/ on the function/struct names
below for consistency.

> +
> +static void starfive_eth_plat_fix_mac_speed(void *priv, unsigned int speed)
> +{
> +       struct starfive_dwmac *dwmac = priv;
> +       unsigned long rate;
> +       int err;
> +
> +       rate = clk_get_rate(dwmac->clk_gtx);
> +
> +       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);
> +               break;
> +       }
> +
> +       err = clk_set_rate(dwmac->clk_gtx, rate);
> +       if (err)
> +               dev_err(dwmac->dev, "failed to set tx rate %lu\n", rate);
> +}
> +
> +static int starfive_eth_plat_probe(struct platform_device *pdev)
> +{
> +       struct plat_stmmacenet_data *plat_dat;
> +       struct stmmac_resources stmmac_res;
> +       struct starfive_dwmac *dwmac;
> +       int err;
> +
> +       err = stmmac_get_platform_resources(pdev, &stmmac_res);
> +       if (err)
> +               return err;
> +
> +       plat_dat = 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->clk_tx = devm_clk_get_enabled(&pdev->dev, "tx");
> +       if (IS_ERR(dwmac->clk_tx))
> +               return dev_err_probe(&pdev->dev, PTR_ERR(dwmac->clk_tx),
> +                                               "error getting tx clock\n");
> +
> +       dwmac->clk_gtx = devm_clk_get_enabled(&pdev->dev, "gtx");
> +       if (IS_ERR(dwmac->clk_gtx))
> +               return dev_err_probe(&pdev->dev, PTR_ERR(dwmac->clk_gtx),
> +                                               "error getting gtx clock\n");
> +
> +       dwmac->clk_gtxc = devm_clk_get_enabled(&pdev->dev, "gtxc");
> +       if (IS_ERR(dwmac->clk_gtxc))
> +               return dev_err_probe(&pdev->dev, PTR_ERR(dwmac->clk_gtxc),
> +                                               "error getting gtxc clock\n");
> +
> +       dwmac->dev = &pdev->dev;
> +       plat_dat->fix_mac_speed = starfive_eth_plat_fix_mac_speed;
> +       plat_dat->init = NULL;
> +       plat_dat->bsp_priv = dwmac;
> +       plat_dat->dma_cfg->dche = true;
> +
> +       err = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
> +       if (err) {
> +               stmmac_remove_config_dt(pdev, plat_dat);
> +               return err;
> +       }
> +
> +       return 0;
> +}
> +
> +static const struct of_device_id starfive_eth_plat_match[] = {
> +       { .compatible = "starfive,jh7110-dwmac" },
> +       { }
> +};
> +
> +static struct platform_driver starfive_eth_plat_driver = {
> +       .probe  = starfive_eth_plat_probe,
> +       .remove = stmmac_pltfr_remove,
> +       .driver = {
> +               .name = "starfive-eth-plat",
> +               .pm = &stmmac_pltfr_pm_ops,
> +               .of_match_table = starfive_eth_plat_match,
> +       },
> +};
> +
> +module_platform_driver(starfive_eth_plat_driver);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_DESCRIPTION("StarFive DWMAC platform driver");
> +MODULE_AUTHOR("Yanhong Wang <yanhong.wang@starfivetech.com>");
> --
> 2.17.1
>
>
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