drivers/phy/marvell/phy-armada38x-comphy.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2018 Russell King, Deep Blue Solutions Ltd.
   4  *
   5  * Partly derived from CP110 comphy driver by Antoine Tenart
   6  * <antoine.tenart@bootlin.com>
   7  */
   8 #include <linux/delay.h>
   9 #include <linux/iopoll.h>
  10 #include <linux/module.h>
  11 #include <linux/phy/phy.h>
  12 #include <linux/phy.h>
  13 #include <linux/platform_device.h>
  14
  15 #define MAX_A38X_COMPHY 6
  16 #define MAX_A38X_PORTS  3
  17
  18 #define COMPHY_CFG1             0x00
  19 #define  COMPHY_CFG1_GEN_TX(x)          ((x) << 26)
  20 #define  COMPHY_CFG1_GEN_TX_MSK         COMPHY_CFG1_GEN_TX(15)
  21 #define  COMPHY_CFG1_GEN_RX(x)          ((x) << 22)
  22 #define  COMPHY_CFG1_GEN_RX_MSK         COMPHY_CFG1_GEN_RX(15)
  23 #define  GEN_SGMII_1_25GBPS             6
  24 #define  GEN_SGMII_3_125GBPS            8
  25
  26 #define COMPHY_STAT1            0x18
  27 #define  COMPHY_STAT1_PLL_RDY_TX        BIT(3)
  28 #define  COMPHY_STAT1_PLL_RDY_RX        BIT(2)
  29
  30 #define COMPHY_SELECTOR         0xfc
  31
  32 struct a38x_comphy;
  33
  34 struct a38x_comphy_lane {
  35         void __iomem *base;
  36         struct a38x_comphy *priv;
  37         unsigned int n;
  38
  39         int port;
  40 };
  41
  42 struct a38x_comphy {
  43         void __iomem *base;
  44         void __iomem *conf;
  45         struct device *dev;
  46         struct a38x_comphy_lane lane[MAX_A38X_COMPHY];
  47 };
  48
  49 static const u8 gbe_mux[MAX_A38X_COMPHY][MAX_A38X_PORTS] = {
  50         { 0, 0, 0 },
  51         { 4, 5, 0 },
  52         { 0, 4, 0 },
  53         { 0, 0, 4 },
  54         { 0, 3, 0 },
  55         { 0, 0, 3 },
  56 };
  57
  58 static void a38x_set_conf(struct a38x_comphy_lane *lane, bool enable)
  59 {
  60         struct a38x_comphy *priv = lane->priv;
  61         u32 conf;
  62
  63         if (priv->conf) {
  64                 conf = readl_relaxed(priv->conf);
  65                 if (enable)
  66                         conf |= BIT(lane->port);
  67                 else
  68                         conf &= ~BIT(lane->port);
  69                 writel(conf, priv->conf);
  70         }
  71 }
  72
  73 static void a38x_comphy_set_reg(struct a38x_comphy_lane *lane,
  74                                 unsigned int offset, u32 mask, u32 value)
  75 {
  76         u32 val;
  77
  78         val = readl_relaxed(lane->base + offset) & ~mask;
  79         writel(val | value, lane->base + offset);
  80 }
  81
  82 static void a38x_comphy_set_speed(struct a38x_comphy_lane *lane,
  83                                   unsigned int gen_tx, unsigned int gen_rx)
  84 {
  85         a38x_comphy_set_reg(lane, COMPHY_CFG1,
  86                             COMPHY_CFG1_GEN_TX_MSK | COMPHY_CFG1_GEN_RX_MSK,
  87                             COMPHY_CFG1_GEN_TX(gen_tx) |
  88                             COMPHY_CFG1_GEN_RX(gen_rx));
  89 }
  90
  91 static int a38x_comphy_poll(struct a38x_comphy_lane *lane,
  92                             unsigned int offset, u32 mask, u32 value)
  93 {
  94         u32 val;
  95         int ret;
  96
  97         ret = readl_relaxed_poll_timeout_atomic(lane->base + offset, val,
  98                                                 (val & mask) == value,
  99                                                 1000, 150000);
 100
 101         if (ret)
 102                 dev_err(lane->priv->dev,
 103                         "comphy%u: timed out waiting for status\n", lane->n);
 104
 105         return ret;
 106 }
 107
 108 /*
 109  * We only support changing the speed for comphys configured for GBE.
 110  * Since that is all we do, we only poll for PLL ready status.
 111  */
 112 static int a38x_comphy_set_mode(struct phy *phy, enum phy_mode mode, int sub)
 113 {
 114         struct a38x_comphy_lane *lane = phy_get_drvdata(phy);
 115         unsigned int gen;
 116         int ret;
 117
 118         if (mode != PHY_MODE_ETHERNET)
 119                 return -EINVAL;
 120
 121         switch (sub) {
 122         case PHY_INTERFACE_MODE_SGMII:
 123         case PHY_INTERFACE_MODE_1000BASEX:
 124                 gen = GEN_SGMII_1_25GBPS;
 125                 break;
 126
 127         case PHY_INTERFACE_MODE_2500BASEX:
 128                 gen = GEN_SGMII_3_125GBPS;
 129                 break;
 130
 131         default:
 132                 return -EINVAL;
 133         }
 134
 135         a38x_set_conf(lane, false);
 136
 137         a38x_comphy_set_speed(lane, gen, gen);
 138
 139         ret = a38x_comphy_poll(lane, COMPHY_STAT1,
 140                                COMPHY_STAT1_PLL_RDY_TX |
 141                                COMPHY_STAT1_PLL_RDY_RX,
 142                                COMPHY_STAT1_PLL_RDY_TX |
 143                                COMPHY_STAT1_PLL_RDY_RX);
 144
 145         if (ret == 0)
 146                 a38x_set_conf(lane, true);
 147
 148         return ret;
 149 }
 150
 151 static const struct phy_ops a38x_comphy_ops = {
 152         .set_mode       = a38x_comphy_set_mode,
 153         .owner          = THIS_MODULE,
 154 };
 155
 156 static struct phy *a38x_comphy_xlate(struct device *dev,
 157                                      struct of_phandle_args *args)
 158 {
 159         struct a38x_comphy_lane *lane;
 160         struct phy *phy;
 161         u32 val;
 162
 163         if (WARN_ON(args->args[0] >= MAX_A38X_PORTS))
 164                 return ERR_PTR(-EINVAL);
 165
 166         phy = of_phy_simple_xlate(dev, args);
 167         if (IS_ERR(phy))
 168                 return phy;
 169
 170         lane = phy_get_drvdata(phy);
 171         if (lane->port >= 0)
 172                 return ERR_PTR(-EBUSY);
 173
 174         lane->port = args->args[0];
 175
 176         val = readl_relaxed(lane->priv->base + COMPHY_SELECTOR);
 177         val = (val >> (4 * lane->n)) & 0xf;
 178
 179         if (!gbe_mux[lane->n][lane->port] ||
 180             val != gbe_mux[lane->n][lane->port]) {
 181                 dev_warn(lane->priv->dev,
 182                          "comphy%u: not configured for GBE\n", lane->n);
 183                 phy = ERR_PTR(-EINVAL);
 184         }
 185
 186         return phy;
 187 }
 188
 189 static int a38x_comphy_probe(struct platform_device *pdev)
 190 {
 191         struct phy_provider *provider;
 192         struct device_node *child;
 193         struct a38x_comphy *priv;
 194         struct resource *res;
 195         void __iomem *base;
 196
 197         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 198         if (!priv)
 199                 return -ENOMEM;
 200
 201         base = devm_platform_ioremap_resource(pdev, 0);
 202         if (IS_ERR(base))
 203                 return PTR_ERR(base);
 204
 205         priv->dev = &pdev->dev;
 206         priv->base = base;
 207
 208         /* Optional */
 209         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "conf");
 210         if (res) {
 211                 priv->conf = devm_ioremap_resource(&pdev->dev, res);
 212                 if (IS_ERR(priv->conf))
 213                         return PTR_ERR(priv->conf);
 214         }
 215
 216         for_each_available_child_of_node(pdev->dev.of_node, child) {
 217                 struct phy *phy;
 218                 int ret;
 219                 u32 val;
 220
 221                 ret = of_property_read_u32(child, "reg", &val);
 222                 if (ret < 0) {
 223                         dev_err(&pdev->dev, "missing 'reg' property (%d)\n",
 224                                 ret);
 225                         continue;
 226                 }
 227
 228                 if (val >= MAX_A38X_COMPHY || priv->lane[val].base) {
 229                         dev_err(&pdev->dev, "invalid 'reg' property\n");
 230                         continue;
 231                 }
 232
 233                 phy = devm_phy_create(&pdev->dev, child, &a38x_comphy_ops);
 234                 if (IS_ERR(phy)) {
 235                         of_node_put(child);
 236                         return PTR_ERR(phy);
 237                 }
 238
 239                 priv->lane[val].base = base + 0x28 * val;
 240                 priv->lane[val].priv = priv;
 241                 priv->lane[val].n = val;
 242                 priv->lane[val].port = -1;
 243                 phy_set_drvdata(phy, &priv->lane[val]);
 244         }
 245
 246         dev_set_drvdata(&pdev->dev, priv);
 247
 248         provider = devm_of_phy_provider_register(&pdev->dev, a38x_comphy_xlate);
 249
 250         return PTR_ERR_OR_ZERO(provider);
 251 }
 252
 253 static const struct of_device_id a38x_comphy_of_match_table[] = {
 254         { .compatible = "marvell,armada-380-comphy" },
 255         { },
 256 };
 257 MODULE_DEVICE_TABLE(of, a38x_comphy_of_match_table);
 258
 259 static struct platform_driver a38x_comphy_driver = {
 260         .probe  = a38x_comphy_probe,
 261         .driver = {
 262                 .name = "armada-38x-comphy",
 263                 .of_match_table = a38x_comphy_of_match_table,
 264         },
 265 };
 266 module_platform_driver(a38x_comphy_driver);
 267
 268 MODULE_AUTHOR("Russell King <rmk+kernel@armlinux.org.uk>");
 269 MODULE_DESCRIPTION("Common PHY driver for Armada 38x SoCs");
 270 MODULE_LICENSE("GPL v2");