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

   1 /*
   2  * Amlogic Meson 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 void *meson6_dwmac_setup(struct platform_device *pdev)
  51 {
  52         struct meson_dwmac *dwmac;
  53         struct resource *res;
  54
  55         dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
  56         if (!dwmac)
  57                 return ERR_PTR(-ENOMEM);
  58
  59         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
  60         dwmac->reg = devm_ioremap_resource(&pdev->dev, res);
  61         if (IS_ERR(dwmac->reg))
  62                 return ERR_CAST(dwmac->reg);
  63
  64         return dwmac;
  65 }
  66
  67 static const struct stmmac_of_data meson6_dwmac_data = {
  68         .setup          = meson6_dwmac_setup,
  69         .fix_mac_speed  = meson6_dwmac_fix_mac_speed,
  70 };
  71
  72 static const struct of_device_id meson6_dwmac_match[] = {
  73         { .compatible = "amlogic,meson6-dwmac", .data = &meson6_dwmac_data},
  74         { }
  75 };
  76 MODULE_DEVICE_TABLE(of, meson6_dwmac_match);
  77
  78 static struct platform_driver meson6_dwmac_driver = {
  79         .probe  = stmmac_pltfr_probe,
  80         .remove = stmmac_pltfr_remove,
  81         .driver = {
  82                 .name           = "meson6-dwmac",
  83                 .pm             = &stmmac_pltfr_pm_ops,
  84                 .of_match_table = meson6_dwmac_match,
  85         },
  86 };
  87 module_platform_driver(meson6_dwmac_driver);
  88
  89 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
  90 MODULE_DESCRIPTION("Amlogic Meson DWMAC glue layer");
  91 MODULE_LICENSE("GPL v2");