drivers/net/dwmac_socfpga.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2018 Marek Vasut <[email protected]>
   4  *
   5  * Altera SoCFPGA EMAC extras
   6  */
   7
   8 #include <common.h>
   9 #include <asm/io.h>
  10 #include <dm.h>
  11 #include <clk.h>
  12 #include <phy.h>
  13 #include <regmap.h>
  14 #include <reset.h>
  15 #include <syscon.h>
  16 #include "designware.h"
  17 #include <dm/device_compat.h>
  18 #include <linux/err.h>
  19
  20 #include <asm/arch/system_manager.h>
  21
  22 struct dwmac_socfpga_platdata {
  23         struct dw_eth_pdata     dw_eth_pdata;
  24         void                    *phy_intf;
  25         u32                     reg_shift;
  26 };
  27
  28 static int dwmac_socfpga_ofdata_to_platdata(struct udevice *dev)
  29 {
  30         struct dwmac_socfpga_platdata *pdata = dev_get_platdata(dev);
  31         struct regmap *regmap;
  32         struct ofnode_phandle_args args;
  33         void *range;
  34         int ret;
  35
  36         ret = dev_read_phandle_with_args(dev, "altr,sysmgr-syscon", NULL,
  37                                          2, 0, &args);
  38         if (ret) {
  39                 dev_err(dev, "Failed to get syscon: %d\n", ret);
  40                 return ret;
  41         }
  42
  43         if (args.args_count != 2) {
  44                 dev_err(dev, "Invalid number of syscon args\n");
  45                 return -EINVAL;
  46         }
  47
  48         regmap = syscon_node_to_regmap(args.node);
  49         if (IS_ERR(regmap)) {
  50                 ret = PTR_ERR(regmap);
  51                 dev_err(dev, "Failed to get regmap: %d\n", ret);
  52                 return ret;
  53         }
  54
  55         range = regmap_get_range(regmap, 0);
  56         if (!range) {
  57                 dev_err(dev, "Failed to get regmap range\n");
  58                 return -ENOMEM;
  59         }
  60
  61         pdata->phy_intf = range + args.args[0];
  62         pdata->reg_shift = args.args[1];
  63
  64         return designware_eth_ofdata_to_platdata(dev);
  65 }
  66
  67 static int dwmac_socfpga_probe(struct udevice *dev)
  68 {
  69         struct dwmac_socfpga_platdata *pdata = dev_get_platdata(dev);
  70         struct eth_pdata *edata = &pdata->dw_eth_pdata.eth_pdata;
  71         struct reset_ctl_bulk reset_bulk;
  72         int ret;
  73         u32 modereg;
  74         u32 modemask;
  75
  76         switch (edata->phy_interface) {
  77         case PHY_INTERFACE_MODE_MII:
  78         case PHY_INTERFACE_MODE_GMII:
  79                 modereg = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII;
  80                 break;
  81         case PHY_INTERFACE_MODE_RMII:
  82                 modereg = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RMII;
  83                 break;
  84         case PHY_INTERFACE_MODE_RGMII:
  85                 modereg = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RGMII;
  86                 break;
  87         default:
  88                 dev_err(dev, "Unsupported PHY mode\n");
  89                 return -EINVAL;
  90         }
  91
  92         ret = reset_get_bulk(dev, &reset_bulk);
  93         if (ret) {
  94                 dev_err(dev, "Failed to get reset: %d\n", ret);
  95                 return ret;
  96         }
  97
  98         reset_assert_bulk(&reset_bulk);
  99
 100         modemask = SYSMGR_EMACGRP_CTRL_PHYSEL_MASK << pdata->reg_shift;
 101         clrsetbits_le32(pdata->phy_intf, modemask,
 102                         modereg << pdata->reg_shift);
 103
 104         reset_release_bulk(&reset_bulk);
 105
 106         return designware_eth_probe(dev);
 107 }
 108
 109 static const struct udevice_id dwmac_socfpga_ids[] = {
 110         { .compatible = "altr,socfpga-stmmac" },
 111         { }
 112 };
 113
 114 U_BOOT_DRIVER(dwmac_socfpga) = {
 115         .name           = "dwmac_socfpga",
 116         .id             = UCLASS_ETH,
 117         .of_match       = dwmac_socfpga_ids,
 118         .ofdata_to_platdata = dwmac_socfpga_ofdata_to_platdata,
 119         .probe          = dwmac_socfpga_probe,
 120         .ops            = &designware_eth_ops,
 121         .priv_auto      = sizeof(struct dw_eth_dev),
 122         .platdata_auto  = sizeof(struct dwmac_socfpga_platdata),
 123         .flags          = DM_FLAG_ALLOC_PRIV_DMA,
 124 };