drivers/net/ethernet/stmicro/stmmac/dwmac-meson.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Amlogic Meson6 and Meson8 DWMAC glue layer
   4  *
   5  * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
   6  */
   7
   8 #include <linux/device.h>
   9 #include <linux/ethtool.h>
  10 #include <linux/io.h>
  11 #include <linux/ioport.h>
  12 #include <linux/module.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/stmmac.h>
  15
  16 #include "stmmac_platform.h"
  17
  18 #define ETHMAC_SPEED_100        BIT(1)
  19
  20 struct meson_dwmac {
  21         struct device   *dev;
  22         void __iomem    *reg;
  23 };
  24
  25 static void meson6_dwmac_fix_mac_speed(void *priv, unsigned int speed, unsigned int mode)
  26 {
  27         struct meson_dwmac *dwmac = priv;
  28         unsigned int val;
  29
  30         val = readl(dwmac->reg);
  31
  32         switch (speed) {
  33         case SPEED_10:
  34                 val &= ~ETHMAC_SPEED_100;
  35                 break;
  36         case SPEED_100:
  37                 val |= ETHMAC_SPEED_100;
  38                 break;
  39         }
  40
  41         writel(val, dwmac->reg);
  42 }
  43
  44 static int meson6_dwmac_probe(struct platform_device *pdev)
  45 {
  46         struct plat_stmmacenet_data *plat_dat;
  47         struct stmmac_resources stmmac_res;
  48         struct meson_dwmac *dwmac;
  49         int ret;
  50
  51         ret = stmmac_get_platform_resources(pdev, &stmmac_res);
  52         if (ret)
  53                 return ret;
  54
  55         plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);
  56         if (IS_ERR(plat_dat))
  57                 return PTR_ERR(plat_dat);
  58
  59         dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
  60         if (!dwmac)
  61                 return -ENOMEM;
  62
  63         dwmac->reg = devm_platform_ioremap_resource(pdev, 1);
  64         if (IS_ERR(dwmac->reg))
  65                 return PTR_ERR(dwmac->reg);
  66
  67         plat_dat->bsp_priv = dwmac;
  68         plat_dat->fix_mac_speed = meson6_dwmac_fix_mac_speed;
  69
  70         return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
  71 }
  72
  73 static const struct of_device_id meson6_dwmac_match[] = {
  74         { .compatible = "amlogic,meson6-dwmac" },
  75         { }
  76 };
  77 MODULE_DEVICE_TABLE(of, meson6_dwmac_match);
  78
  79 static struct platform_driver meson6_dwmac_driver = {
  80         .probe  = meson6_dwmac_probe,
  81         .remove_new = stmmac_pltfr_remove,
  82         .driver = {
  83                 .name           = "meson6-dwmac",
  84                 .pm             = &stmmac_pltfr_pm_ops,
  85                 .of_match_table = meson6_dwmac_match,
  86         },
  87 };
  88 module_platform_driver(meson6_dwmac_driver);
  89
  90 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
  91 MODULE_DESCRIPTION("Amlogic Meson6 and Meson8 DWMAC glue layer");
  92 MODULE_LICENSE("GPL v2");