target/linux/starfive/patches-6.1/0044-net-stmmac-Add-glue-layer-for-StarFive-JH7110-SoC.patch

   1 From 7c82049adb0460985dd6a1e5c9b6954d901247d2 Mon Sep 17 00:00:00 2001
   2 From: Samin Guo <samin.guo@starfivetech.com>
   3 Date: Fri, 3 Mar 2023 16:50:58 +0800
   4 Subject: [PATCH 044/122] net: stmmac: Add glue layer for StarFive JH7110 SoC
   5
   6 This adds StarFive dwmac driver support on the StarFive JH7110 SoC.
   7
   8 Tested-by: Tommaso Merciai <tomm.merciai@gmail.com>
   9 Co-developed-by: Emil Renner Berthing <kernel@esmil.dk>
  10 Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
  11 Signed-off-by: Paolo Abeni <pabeni@redhat.com>
  12 Signed-off-by: Samin Guo <samin.guo@starfivetech.com>
  13 ---
  14  MAINTAINERS                                   |   1 +
  15  drivers/net/ethernet/stmicro/stmmac/Kconfig   |  12 ++
  16  drivers/net/ethernet/stmicro/stmmac/Makefile  |   1 +
  17  .../ethernet/stmicro/stmmac/dwmac-starfive.c  | 123 ++++++++++++++++++
  18  4 files changed, 137 insertions(+)
  19  create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c
  20
  21 --- a/MAINTAINERS
  22 +++ b/MAINTAINERS
  23 @@ -19662,6 +19662,7 @@ M:      Emil Renner Berthing <kernel@esmil.dk
  24  M:     Samin Guo <samin.guo@starfivetech.com>
  25  S:     Maintained
  26  F:     Documentation/devicetree/bindings/net/starfive,jh7110-dwmac.yaml
  27 +F:     drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c
  28
  29  STARFIVE JH7110 PLL CLOCK DRIVER
  30  M:     Xingyu Wu <xingyu.wu@starfivetech.com>
  31 --- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
  32 +++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
  33 @@ -165,6 +165,18 @@ config DWMAC_SOCFPGA
  34           for the stmmac device driver. This driver is used for
  35           arria5 and cyclone5 FPGA SoCs.
  36
  37 +config DWMAC_STARFIVE
  38 +       tristate "StarFive dwmac support"
  39 +       depends on OF && (ARCH_STARFIVE || COMPILE_TEST)
  40 +       select MFD_SYSCON
  41 +       default m if ARCH_STARFIVE
  42 +       help
  43 +         Support for ethernet controllers on StarFive RISC-V SoCs
  44 +
  45 +         This selects the StarFive platform specific glue layer support for
  46 +         the stmmac device driver. This driver is used for StarFive JH7110
  47 +         ethernet controller.
  48 +
  49  config DWMAC_STI
  50         tristate "STi GMAC support"
  51         default ARCH_STI
  52 --- a/drivers/net/ethernet/stmicro/stmmac/Makefile
  53 +++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
  54 @@ -23,6 +23,7 @@ obj-$(CONFIG_DWMAC_OXNAS)     += dwmac-oxnas
  55  obj-$(CONFIG_DWMAC_QCOM_ETHQOS)        += dwmac-qcom-ethqos.o
  56  obj-$(CONFIG_DWMAC_ROCKCHIP)   += dwmac-rk.o
  57  obj-$(CONFIG_DWMAC_SOCFPGA)    += dwmac-altr-socfpga.o
  58 +obj-$(CONFIG_DWMAC_STARFIVE)   += dwmac-starfive.o
  59  obj-$(CONFIG_DWMAC_STI)                += dwmac-sti.o
  60  obj-$(CONFIG_DWMAC_STM32)      += dwmac-stm32.o
  61  obj-$(CONFIG_DWMAC_SUNXI)      += dwmac-sunxi.o
  62 --- /dev/null
  63 +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c
  64 @@ -0,0 +1,123 @@
  65 +// SPDX-License-Identifier: GPL-2.0+
  66 +/*
  67 + * StarFive DWMAC platform driver
  68 + *
  69 + * Copyright (C) 2021 Emil Renner Berthing <kernel@esmil.dk>
  70 + * Copyright (C) 2022 StarFive Technology Co., Ltd.
  71 + *
  72 + */
  73 +
  74 +#include <linux/mfd/syscon.h>
  75 +#include <linux/of_device.h>
  76 +#include <linux/regmap.h>
  77 +
  78 +#include "stmmac_platform.h"
  79 +
  80 +struct starfive_dwmac {
  81 +       struct device *dev;
  82 +       struct clk *clk_tx;
  83 +};
  84 +
  85 +static void starfive_dwmac_fix_mac_speed(void *priv, unsigned int speed)
  86 +{
  87 +       struct starfive_dwmac *dwmac = priv;
  88 +       unsigned long rate;
  89 +       int err;
  90 +
  91 +       rate = clk_get_rate(dwmac->clk_tx);
  92 +
  93 +       switch (speed) {
  94 +       case SPEED_1000:
  95 +               rate = 125000000;
  96 +               break;
  97 +       case SPEED_100:
  98 +               rate = 25000000;
  99 +               break;
 100 +       case SPEED_10:
 101 +               rate = 2500000;
 102 +               break;
 103 +       default:
 104 +               dev_err(dwmac->dev, "invalid speed %u\n", speed);
 105 +               break;
 106 +       }
 107 +
 108 +       err = clk_set_rate(dwmac->clk_tx, rate);
 109 +       if (err)
 110 +               dev_err(dwmac->dev, "failed to set tx rate %lu\n", rate);
 111 +}
 112 +
 113 +static int starfive_dwmac_probe(struct platform_device *pdev)
 114 +{
 115 +       struct plat_stmmacenet_data *plat_dat;
 116 +       struct stmmac_resources stmmac_res;
 117 +       struct starfive_dwmac *dwmac;
 118 +       struct clk *clk_gtx;
 119 +       int err;
 120 +
 121 +       err = stmmac_get_platform_resources(pdev, &stmmac_res);
 122 +       if (err)
 123 +               return dev_err_probe(&pdev->dev, err,
 124 +                                    "failed to get resources\n");
 125 +
 126 +       plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
 127 +       if (IS_ERR(plat_dat))
 128 +               return dev_err_probe(&pdev->dev, PTR_ERR(plat_dat),
 129 +                                    "dt configuration failed\n");
 130 +
 131 +       dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
 132 +       if (!dwmac)
 133 +               return -ENOMEM;
 134 +
 135 +       dwmac->clk_tx = devm_clk_get_enabled(&pdev->dev, "tx");
 136 +       if (IS_ERR(dwmac->clk_tx))
 137 +               return dev_err_probe(&pdev->dev, PTR_ERR(dwmac->clk_tx),
 138 +                                    "error getting tx clock\n");
 139 +
 140 +       clk_gtx = devm_clk_get_enabled(&pdev->dev, "gtx");
 141 +       if (IS_ERR(clk_gtx))
 142 +               return dev_err_probe(&pdev->dev, PTR_ERR(clk_gtx),
 143 +                                    "error getting gtx clock\n");
 144 +
 145 +       /* Generally, the rgmii_tx clock is provided by the internal clock,
 146 +        * which needs to match the corresponding clock frequency according
 147 +        * to different speeds. If the rgmii_tx clock is provided by the
 148 +        * external rgmii_rxin, there is no need to configure the clock
 149 +        * internally, because rgmii_rxin will be adaptively adjusted.
 150 +        */
 151 +       if (!device_property_read_bool(&pdev->dev, "starfive,tx-use-rgmii-clk"))
 152 +               plat_dat->fix_mac_speed = starfive_dwmac_fix_mac_speed;
 153 +
 154 +       dwmac->dev = &pdev->dev;
 155 +       plat_dat->bsp_priv = dwmac;
 156 +       plat_dat->dma_cfg->dche = true;
 157 +
 158 +       err = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
 159 +       if (err) {
 160 +               stmmac_remove_config_dt(pdev, plat_dat);
 161 +               return err;
 162 +       }
 163 +
 164 +       return 0;
 165 +}
 166 +
 167 +static const struct of_device_id starfive_dwmac_match[] = {
 168 +       { .compatible = "starfive,jh7110-dwmac" },
 169 +       { /* sentinel */ }
 170 +};
 171 +MODULE_DEVICE_TABLE(of, starfive_dwmac_match);
 172 +
 173 +static struct platform_driver starfive_dwmac_driver = {
 174 +       .probe  = starfive_dwmac_probe,
 175 +       .remove = stmmac_pltfr_remove,
 176 +       .driver = {
 177 +               .name = "starfive-dwmac",
 178 +               .pm = &stmmac_pltfr_pm_ops,
 179 +               .of_match_table = starfive_dwmac_match,
 180 +       },
 181 +};
 182 +module_platform_driver(starfive_dwmac_driver);
 183 +
 184 +MODULE_LICENSE("GPL");
 185 +MODULE_DESCRIPTION("StarFive DWMAC platform driver");
 186 +MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>");
 187 +MODULE_AUTHOR("Samin Guo <samin.guo@starfivetech.com>");