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

   1 /*
   2  * Amlogic Meson6 and Meson8 DWMAC glue layer
   3  *
   4  * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * You should have received a copy of the GNU General Public License
  11  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  12  */
  13
  14 #include <linux/device.h>
  15 #include <linux/ethtool.h>
  16 #include <linux/io.h>
  17 #include <linux/ioport.h>
  18 #include <linux/module.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/stmmac.h>
  21
  22 #include "stmmac_platform.h"
  23
  24 #define ETHMAC_SPEED_100        BIT(1)
  25
  26 struct meson_dwmac {
  27         struct device   *dev;
  28         void __iomem    *reg;
  29 };
  30
  31 static void meson6_dwmac_fix_mac_speed(void *priv, unsigned int speed)
  32 {
  33         struct meson_dwmac *dwmac = priv;
  34         unsigned int val;
  35
  36         val = readl(dwmac->reg);
  37
  38         switch (speed) {
  39         case SPEED_10:
  40                 val &= ~ETHMAC_SPEED_100;
  41                 break;
  42         case SPEED_100:
  43                 val |= ETHMAC_SPEED_100;
  44                 break;
  45         }
  46
  47         writel(val, dwmac->reg);
  48 }
  49
  50 static int meson6_dwmac_probe(struct platform_device *pdev)
  51 {
  52         struct plat_stmmacenet_data *plat_dat;
  53         struct stmmac_resources stmmac_res;
  54         struct meson_dwmac *dwmac;
  55         struct resource *res;
  56         int ret;
  57
  58         ret = stmmac_get_platform_resources(pdev, &stmmac_res);
  59         if (ret)
  60                 return ret;
  61
  62         plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
  63         if (IS_ERR(plat_dat))
  64                 return PTR_ERR(plat_dat);
  65
  66         dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
  67         if (!dwmac) {
  68                 ret = -ENOMEM;
  69                 goto err_remove_config_dt;
  70         }
  71
  72         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
  73         dwmac->reg = devm_ioremap_resource(&pdev->dev, res);
  74         if (IS_ERR(dwmac->reg)) {
  75                 ret = PTR_ERR(dwmac->reg);
  76                 goto err_remove_config_dt;
  77         }
  78
  79         plat_dat->bsp_priv = dwmac;
  80         plat_dat->fix_mac_speed = meson6_dwmac_fix_mac_speed;
  81
  82         ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
  83         if (ret)
  84                 goto err_remove_config_dt;
  85
  86         return 0;
  87
  88 err_remove_config_dt:
  89         stmmac_remove_config_dt(pdev, plat_dat);
  90
  91         return ret;
  92 }
  93
  94 static const struct of_device_id meson6_dwmac_match[] = {
  95         { .compatible = "amlogic,meson6-dwmac" },
  96         { }
  97 };
  98 MODULE_DEVICE_TABLE(of, meson6_dwmac_match);
  99
 100 static struct platform_driver meson6_dwmac_driver = {
 101         .probe  = meson6_dwmac_probe,
 102         .remove = stmmac_pltfr_remove,
 103         .driver = {
 104                 .name           = "meson6-dwmac",
 105                 .pm             = &stmmac_pltfr_pm_ops,
 106                 .of_match_table = meson6_dwmac_match,
 107         },
 108 };
 109 module_platform_driver(meson6_dwmac_driver);
 110
 111 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
 112 MODULE_DESCRIPTION("Amlogic Meson6 and Meson8 DWMAC glue layer");
 113 MODULE_LICENSE("GPL v2");