drivers/net/ethernet/stmicro/stmmac/dwmac-lpc18xx.c

   1 /*
   2  * DWMAC glue for NXP LPC18xx/LPC43xx Ethernet
   3  *
   4  * Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com>
   5  *
   6  * This file is licensed under the terms of the GNU General Public
   7  * License version 2. This program is licensed "as is" without any
   8  * warranty of any kind, whether express or implied.
   9  */
  10
  11 #include <linux/mfd/syscon.h>
  12 #include <linux/module.h>
  13 #include <linux/of.h>
  14 #include <linux/of_net.h>
  15 #include <linux/phy.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/regmap.h>
  18 #include <linux/stmmac.h>
  19
  20 #include "stmmac_platform.h"
  21
  22 /* Register defines for CREG syscon */
  23 #define LPC18XX_CREG_CREG6                      0x12c
  24 # define LPC18XX_CREG_CREG6_ETHMODE_MASK        0x7
  25 # define LPC18XX_CREG_CREG6_ETHMODE_MII         0x0
  26 # define LPC18XX_CREG_CREG6_ETHMODE_RMII        0x4
  27
  28 static int lpc18xx_dwmac_probe(struct platform_device *pdev)
  29 {
  30         struct plat_stmmacenet_data *plat_dat;
  31         struct stmmac_resources stmmac_res;
  32         struct regmap *reg;
  33         u8 ethmode;
  34         int ret;
  35
  36         ret = stmmac_get_platform_resources(pdev, &stmmac_res);
  37         if (ret)
  38                 return ret;
  39
  40         plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
  41         if (IS_ERR(plat_dat))
  42                 return PTR_ERR(plat_dat);
  43
  44         plat_dat->has_gmac = true;
  45
  46         reg = syscon_regmap_lookup_by_compatible("nxp,lpc1850-creg");
  47         if (IS_ERR(reg)) {
  48                 dev_err(&pdev->dev, "syscon lookup failed\n");
  49                 ret = PTR_ERR(reg);
  50                 goto err_remove_config_dt;
  51         }
  52
  53         if (plat_dat->interface == PHY_INTERFACE_MODE_MII) {
  54                 ethmode = LPC18XX_CREG_CREG6_ETHMODE_MII;
  55         } else if (plat_dat->interface == PHY_INTERFACE_MODE_RMII) {
  56                 ethmode = LPC18XX_CREG_CREG6_ETHMODE_RMII;
  57         } else {
  58                 dev_err(&pdev->dev, "Only MII and RMII mode supported\n");
  59                 ret = -EINVAL;
  60                 goto err_remove_config_dt;
  61         }
  62
  63         regmap_update_bits(reg, LPC18XX_CREG_CREG6,
  64                            LPC18XX_CREG_CREG6_ETHMODE_MASK, ethmode);
  65
  66         ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
  67         if (ret)
  68                 goto err_remove_config_dt;
  69
  70         return 0;
  71
  72 err_remove_config_dt:
  73         stmmac_remove_config_dt(pdev, plat_dat);
  74
  75         return ret;
  76 }
  77
  78 static const struct of_device_id lpc18xx_dwmac_match[] = {
  79         { .compatible = "nxp,lpc1850-dwmac" },
  80         { }
  81 };
  82 MODULE_DEVICE_TABLE(of, lpc18xx_dwmac_match);
  83
  84 static struct platform_driver lpc18xx_dwmac_driver = {
  85         .probe  = lpc18xx_dwmac_probe,
  86         .remove = stmmac_pltfr_remove,
  87         .driver = {
  88                 .name           = "lpc18xx-dwmac",
  89                 .pm             = &stmmac_pltfr_pm_ops,
  90                 .of_match_table = lpc18xx_dwmac_match,
  91         },
  92 };
  93 module_platform_driver(lpc18xx_dwmac_driver);
  94
  95 MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
  96 MODULE_DESCRIPTION("DWMAC glue for LPC18xx/43xx Ethernet");
  97 MODULE_LICENSE("GPL v2");