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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * dwmac-sunxi.c - Allwinner sunxi DWMAC specific glue layer
   4  *
   5  * Copyright (C) 2013 Chen-Yu Tsai
   6  *
   7  * Chen-Yu Tsai  <wens@csie.org>
   8  */
   9
  10 #include <linux/stmmac.h>
  11 #include <linux/clk.h>
  12 #include <linux/module.h>
  13 #include <linux/phy.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/of_net.h>
  16 #include <linux/regulator/consumer.h>
  17
  18 #include "stmmac_platform.h"
  19
  20 struct sunxi_priv_data {
  21         int interface;
  22         int clk_enabled;
  23         struct clk *tx_clk;
  24         struct regulator *regulator;
  25 };
  26
  27 #define SUN7I_GMAC_GMII_RGMII_RATE      125000000
  28 #define SUN7I_GMAC_MII_RATE             25000000
  29
  30 static int sun7i_gmac_init(struct platform_device *pdev, void *priv)
  31 {
  32         struct sunxi_priv_data *gmac = priv;
  33         int ret;
  34
  35         if (gmac->regulator) {
  36                 ret = regulator_enable(gmac->regulator);
  37                 if (ret)
  38                         return ret;
  39         }
  40
  41         /* Set GMAC interface port mode
  42          *
  43          * The GMAC TX clock lines are configured by setting the clock
  44          * rate, which then uses the auto-reparenting feature of the
  45          * clock driver, and enabling/disabling the clock.
  46          */
  47         if (gmac->interface == PHY_INTERFACE_MODE_RGMII) {
  48                 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE);
  49                 clk_prepare_enable(gmac->tx_clk);
  50                 gmac->clk_enabled = 1;
  51         } else {
  52                 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE);
  53                 ret = clk_prepare(gmac->tx_clk);
  54                 if (ret)
  55                         return ret;
  56         }
  57
  58         return 0;
  59 }
  60
  61 static void sun7i_gmac_exit(struct platform_device *pdev, void *priv)
  62 {
  63         struct sunxi_priv_data *gmac = priv;
  64
  65         if (gmac->clk_enabled) {
  66                 clk_disable(gmac->tx_clk);
  67                 gmac->clk_enabled = 0;
  68         }
  69         clk_unprepare(gmac->tx_clk);
  70
  71         if (gmac->regulator)
  72                 regulator_disable(gmac->regulator);
  73 }
  74
  75 static void sun7i_fix_speed(void *priv, unsigned int speed)
  76 {
  77         struct sunxi_priv_data *gmac = priv;
  78
  79         /* only GMII mode requires us to reconfigure the clock lines */
  80         if (gmac->interface != PHY_INTERFACE_MODE_GMII)
  81                 return;
  82
  83         if (gmac->clk_enabled) {
  84                 clk_disable(gmac->tx_clk);
  85                 gmac->clk_enabled = 0;
  86         }
  87         clk_unprepare(gmac->tx_clk);
  88
  89         if (speed == 1000) {
  90                 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE);
  91                 clk_prepare_enable(gmac->tx_clk);
  92                 gmac->clk_enabled = 1;
  93         } else {
  94                 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE);
  95                 clk_prepare(gmac->tx_clk);
  96         }
  97 }
  98
  99 static int sun7i_gmac_probe(struct platform_device *pdev)
 100 {
 101         struct plat_stmmacenet_data *plat_dat;
 102         struct stmmac_resources stmmac_res;
 103         struct sunxi_priv_data *gmac;
 104         struct device *dev = &pdev->dev;
 105         int ret;
 106
 107         ret = stmmac_get_platform_resources(pdev, &stmmac_res);
 108         if (ret)
 109                 return ret;
 110
 111         plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
 112         if (IS_ERR(plat_dat))
 113                 return PTR_ERR(plat_dat);
 114
 115         gmac = devm_kzalloc(dev, sizeof(*gmac), GFP_KERNEL);
 116         if (!gmac) {
 117                 ret = -ENOMEM;
 118                 goto err_remove_config_dt;
 119         }
 120
 121         gmac->interface = of_get_phy_mode(dev->of_node);
 122
 123         gmac->tx_clk = devm_clk_get(dev, "allwinner_gmac_tx");
 124         if (IS_ERR(gmac->tx_clk)) {
 125                 dev_err(dev, "could not get tx clock\n");
 126                 ret = PTR_ERR(gmac->tx_clk);
 127                 goto err_remove_config_dt;
 128         }
 129
 130         /* Optional regulator for PHY */
 131         gmac->regulator = devm_regulator_get_optional(dev, "phy");
 132         if (IS_ERR(gmac->regulator)) {
 133                 if (PTR_ERR(gmac->regulator) == -EPROBE_DEFER) {
 134                         ret = -EPROBE_DEFER;
 135                         goto err_remove_config_dt;
 136                 }
 137                 dev_info(dev, "no regulator found\n");
 138                 gmac->regulator = NULL;
 139         }
 140
 141         /* platform data specifying hardware features and callbacks.
 142          * hardware features were copied from Allwinner drivers. */
 143         plat_dat->tx_coe = 1;
 144         plat_dat->has_gmac = true;
 145         plat_dat->bsp_priv = gmac;
 146         plat_dat->init = sun7i_gmac_init;
 147         plat_dat->exit = sun7i_gmac_exit;
 148         plat_dat->fix_mac_speed = sun7i_fix_speed;
 149
 150         ret = sun7i_gmac_init(pdev, plat_dat->bsp_priv);
 151         if (ret)
 152                 goto err_remove_config_dt;
 153
 154         ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
 155         if (ret)
 156                 goto err_gmac_exit;
 157
 158         return 0;
 159
 160 err_gmac_exit:
 161         sun7i_gmac_exit(pdev, plat_dat->bsp_priv);
 162 err_remove_config_dt:
 163         stmmac_remove_config_dt(pdev, plat_dat);
 164
 165         return ret;
 166 }
 167
 168 static const struct of_device_id sun7i_dwmac_match[] = {
 169         { .compatible = "allwinner,sun7i-a20-gmac" },
 170         { }
 171 };
 172 MODULE_DEVICE_TABLE(of, sun7i_dwmac_match);
 173
 174 static struct platform_driver sun7i_dwmac_driver = {
 175         .probe  = sun7i_gmac_probe,
 176         .remove = stmmac_pltfr_remove,
 177         .driver = {
 178                 .name           = "sun7i-dwmac",
 179                 .pm             = &stmmac_pltfr_pm_ops,
 180                 .of_match_table = sun7i_dwmac_match,
 181         },
 182 };
 183 module_platform_driver(sun7i_dwmac_driver);
 184
 185 MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");
 186 MODULE_DESCRIPTION("Allwinner sunxi DWMAC specific glue layer");
 187 MODULE_LICENSE("GPL");