drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c

   1 /*
   2  * dwmac-stm32.c - DWMAC Specific Glue layer for STM32 MCU
   3  *
   4  * Copyright (C) Alexandre Torgue 2015
   5  * Author:  Alexandre Torgue <alexandre.torgue@gmail.com>
   6  * License terms:  GNU General Public License (GPL), version 2
   7  *
   8  */
   9
  10 #include <linux/clk.h>
  11 #include <linux/kernel.h>
  12 #include <linux/mfd/syscon.h>
  13 #include <linux/module.h>
  14 #include <linux/of.h>
  15 #include <linux/of_device.h>
  16 #include <linux/of_net.h>
  17 #include <linux/phy.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/regmap.h>
  20 #include <linux/slab.h>
  21 #include <linux/stmmac.h>
  22
  23 #include "stmmac_platform.h"
  24
  25 #define MII_PHY_SEL_MASK        BIT(23)
  26
  27 struct stm32_dwmac {
  28         struct clk *clk_tx;
  29         struct clk *clk_rx;
  30         u32 mode_reg;           /* MAC glue-logic mode register */
  31         struct regmap *regmap;
  32         u32 speed;
  33 };
  34
  35 static int stm32_dwmac_init(struct plat_stmmacenet_data *plat_dat)
  36 {
  37         struct stm32_dwmac *dwmac = plat_dat->bsp_priv;
  38         u32 reg = dwmac->mode_reg;
  39         u32 val;
  40         int ret;
  41
  42         val = (plat_dat->interface == PHY_INTERFACE_MODE_MII) ? 0 : 1;
  43         ret = regmap_update_bits(dwmac->regmap, reg, MII_PHY_SEL_MASK, val);
  44         if (ret)
  45                 return ret;
  46
  47         ret = clk_prepare_enable(dwmac->clk_tx);
  48         if (ret)
  49                 return ret;
  50
  51         ret = clk_prepare_enable(dwmac->clk_rx);
  52         if (ret)
  53                 clk_disable_unprepare(dwmac->clk_tx);
  54
  55         return ret;
  56 }
  57
  58 static void stm32_dwmac_clk_disable(struct stm32_dwmac *dwmac)
  59 {
  60         clk_disable_unprepare(dwmac->clk_tx);
  61         clk_disable_unprepare(dwmac->clk_rx);
  62 }
  63
  64 static int stm32_dwmac_parse_data(struct stm32_dwmac *dwmac,
  65                                   struct device *dev)
  66 {
  67         struct device_node *np = dev->of_node;
  68         int err;
  69
  70         /*  Get TX/RX clocks */
  71         dwmac->clk_tx = devm_clk_get(dev, "mac-clk-tx");
  72         if (IS_ERR(dwmac->clk_tx)) {
  73                 dev_err(dev, "No tx clock provided...\n");
  74                 return PTR_ERR(dwmac->clk_tx);
  75         }
  76         dwmac->clk_rx = devm_clk_get(dev, "mac-clk-rx");
  77         if (IS_ERR(dwmac->clk_rx)) {
  78                 dev_err(dev, "No rx clock provided...\n");
  79                 return PTR_ERR(dwmac->clk_rx);
  80         }
  81
  82         /* Get mode register */
  83         dwmac->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscon");
  84         if (IS_ERR(dwmac->regmap))
  85                 return PTR_ERR(dwmac->regmap);
  86
  87         err = of_property_read_u32_index(np, "st,syscon", 1, &dwmac->mode_reg);
  88         if (err)
  89                 dev_err(dev, "Can't get sysconfig mode offset (%d)\n", err);
  90
  91         return err;
  92 }
  93
  94 static int stm32_dwmac_probe(struct platform_device *pdev)
  95 {
  96         struct plat_stmmacenet_data *plat_dat;
  97         struct stmmac_resources stmmac_res;
  98         struct stm32_dwmac *dwmac;
  99         int ret;
 100
 101         ret = stmmac_get_platform_resources(pdev, &stmmac_res);
 102         if (ret)
 103                 return ret;
 104
 105         plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
 106         if (IS_ERR(plat_dat))
 107                 return PTR_ERR(plat_dat);
 108
 109         dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
 110         if (!dwmac)
 111                 return -ENOMEM;
 112
 113         ret = stm32_dwmac_parse_data(dwmac, &pdev->dev);
 114         if (ret) {
 115                 dev_err(&pdev->dev, "Unable to parse OF data\n");
 116                 return ret;
 117         }
 118
 119         plat_dat->bsp_priv = dwmac;
 120
 121         ret = stm32_dwmac_init(plat_dat);
 122         if (ret)
 123                 return ret;
 124
 125         ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
 126         if (ret)
 127                 stm32_dwmac_clk_disable(dwmac);
 128
 129         return ret;
 130 }
 131
 132 static int stm32_dwmac_remove(struct platform_device *pdev)
 133 {
 134         struct net_device *ndev = platform_get_drvdata(pdev);
 135         struct stmmac_priv *priv = netdev_priv(ndev);
 136         int ret = stmmac_dvr_remove(&pdev->dev);
 137
 138         stm32_dwmac_clk_disable(priv->plat->bsp_priv);
 139
 140         return ret;
 141 }
 142
 143 #ifdef CONFIG_PM_SLEEP
 144 static int stm32_dwmac_suspend(struct device *dev)
 145 {
 146         struct net_device *ndev = dev_get_drvdata(dev);
 147         struct stmmac_priv *priv = netdev_priv(ndev);
 148         int ret;
 149
 150         ret = stmmac_suspend(dev);
 151         stm32_dwmac_clk_disable(priv->plat->bsp_priv);
 152
 153         return ret;
 154 }
 155
 156 static int stm32_dwmac_resume(struct device *dev)
 157 {
 158         struct net_device *ndev = dev_get_drvdata(dev);
 159         struct stmmac_priv *priv = netdev_priv(ndev);
 160         int ret;
 161
 162         ret = stm32_dwmac_init(priv->plat);
 163         if (ret)
 164                 return ret;
 165
 166         ret = stmmac_resume(dev);
 167
 168         return ret;
 169 }
 170 #endif /* CONFIG_PM_SLEEP */
 171
 172 SIMPLE_DEV_PM_OPS(stm32_dwmac_pm_ops, stm32_dwmac_suspend, stm32_dwmac_resume);
 173
 174 static const struct of_device_id stm32_dwmac_match[] = {
 175         { .compatible = "st,stm32-dwmac"},
 176         { }
 177 };
 178 MODULE_DEVICE_TABLE(of, stm32_dwmac_match);
 179
 180 static struct platform_driver stm32_dwmac_driver = {
 181         .probe  = stm32_dwmac_probe,
 182         .remove = stm32_dwmac_remove,
 183         .driver = {
 184                 .name           = "stm32-dwmac",
 185                 .pm             = &stm32_dwmac_pm_ops,
 186                 .of_match_table = stm32_dwmac_match,
 187         },
 188 };
 189 module_platform_driver(stm32_dwmac_driver);
 190
 191 MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@gmail.com>");
 192 MODULE_DESCRIPTION("STMicroelectronics MCU DWMAC Specific Glue layer");
 193 MODULE_LICENSE("GPL v2");