kernel/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/platform_device.h>
  19 #include <linux/stmmac.h>
  20
  21 #include "stmmac_platform.h"
  22
  23 #define ETHMAC_SPEED_100        BIT(1)
  24
  25 struct meson_dwmac {
  26         struct device   *dev;
  27         void __iomem    *reg;
  28 };
  29
  30 static void meson6_dwmac_fix_mac_speed(void *priv, unsigned int speed)
  31 {
  32         struct meson_dwmac *dwmac = priv;
  33         unsigned int val;
  34
  35         val = readl(dwmac->reg);
  36
  37         switch (speed) {
  38         case SPEED_10:
  39                 val &= ~ETHMAC_SPEED_100;
  40                 break;
  41         case SPEED_100:
  42                 val |= ETHMAC_SPEED_100;
  43                 break;
  44         }
  45
  46         writel(val, dwmac->reg);
  47 }
  48
  49 static void *meson6_dwmac_setup(struct platform_device *pdev)
  50 {
  51         struct meson_dwmac *dwmac;
  52         struct resource *res;
  53
  54         dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
  55         if (!dwmac)
  56                 return ERR_PTR(-ENOMEM);
  57
  58         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
  59         dwmac->reg = devm_ioremap_resource(&pdev->dev, res);
  60         if (IS_ERR(dwmac->reg))
  61                 return ERR_CAST(dwmac->reg);
  62
  63         return dwmac;
  64 }
  65
  66 const struct stmmac_of_data meson6_dwmac_data = {
  67         .setup          = meson6_dwmac_setup,
  68         .fix_mac_speed  = meson6_dwmac_fix_mac_speed,
  69 };