drivers/net/dsa/mt7530-mdio.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 #include <linux/gpio/consumer.h>
   4 #include <linux/mdio.h>
   5 #include <linux/module.h>
   6 #include <linux/pcs/pcs-mtk-lynxi.h>
   7 #include <linux/of_irq.h>
   8 #include <linux/of_mdio.h>
   9 #include <linux/of_net.h>
  10 #include <linux/of_platform.h>
  11 #include <linux/regmap.h>
  12 #include <linux/reset.h>
  13 #include <linux/regulator/consumer.h>
  14 #include <net/dsa.h>
  15
  16 #include "mt7530.h"
  17
  18 static int
  19 mt7530_regmap_write(void *context, unsigned int reg, unsigned int val)
  20 {
  21         struct mt7530_priv *priv = context;
  22         struct mii_bus *bus = priv->bus;
  23         u16 page, r, lo, hi;
  24         int ret;
  25
  26         page = (reg >> 6) & 0x3ff;
  27         r  = (reg >> 2) & 0xf;
  28         lo = val & 0xffff;
  29         hi = val >> 16;
  30
  31         ret = bus->write(bus, priv->mdiodev->addr, 0x1f, page);
  32         if (ret < 0)
  33                 return ret;
  34
  35         ret = bus->write(bus, priv->mdiodev->addr, r, lo);
  36         if (ret < 0)
  37                 return ret;
  38
  39         ret = bus->write(bus, priv->mdiodev->addr, 0x10, hi);
  40         return ret;
  41 }
  42
  43 static int
  44 mt7530_regmap_read(void *context, unsigned int reg, unsigned int *val)
  45 {
  46         struct mt7530_priv *priv = context;
  47         struct mii_bus *bus = priv->bus;
  48         u16 page, r, lo, hi;
  49         int ret;
  50
  51         page = (reg >> 6) & 0x3ff;
  52         r = (reg >> 2) & 0xf;
  53
  54         ret = bus->write(bus, priv->mdiodev->addr, 0x1f, page);
  55         if (ret < 0)
  56                 return ret;
  57
  58         lo = bus->read(bus, priv->mdiodev->addr, r);
  59         hi = bus->read(bus, priv->mdiodev->addr, 0x10);
  60
  61         *val = (hi << 16) | (lo & 0xffff);
  62
  63         return 0;
  64 }
  65
  66 static void
  67 mt7530_mdio_regmap_lock(void *mdio_lock)
  68 {
  69         mutex_lock_nested(mdio_lock, MDIO_MUTEX_NESTED);
  70 }
  71
  72 static void
  73 mt7530_mdio_regmap_unlock(void *mdio_lock)
  74 {
  75         mutex_unlock(mdio_lock);
  76 }
  77
  78 static const struct regmap_bus mt7530_regmap_bus = {
  79         .reg_write = mt7530_regmap_write,
  80         .reg_read = mt7530_regmap_read,
  81 };
  82
  83 static int
  84 mt7531_create_sgmii(struct mt7530_priv *priv)
  85 {
  86         struct regmap_config *mt7531_pcs_config[2] = {};
  87         struct phylink_pcs *pcs;
  88         struct regmap *regmap;
  89         int i, ret = 0;
  90
  91         for (i = priv->p5_sgmii ? 0 : 1; i < 2; i++) {
  92                 mt7531_pcs_config[i] = devm_kzalloc(priv->dev,
  93                                                     sizeof(struct regmap_config),
  94                                                     GFP_KERNEL);
  95                 if (!mt7531_pcs_config[i]) {
  96                         ret = -ENOMEM;
  97                         break;
  98                 }
  99
 100                 mt7531_pcs_config[i]->name = i ? "port6" : "port5";
 101                 mt7531_pcs_config[i]->reg_bits = 16;
 102                 mt7531_pcs_config[i]->val_bits = 32;
 103                 mt7531_pcs_config[i]->reg_stride = 4;
 104                 mt7531_pcs_config[i]->reg_base = MT7531_SGMII_REG_BASE(5 + i);
 105                 mt7531_pcs_config[i]->max_register = 0x17c;
 106                 mt7531_pcs_config[i]->lock = mt7530_mdio_regmap_lock;
 107                 mt7531_pcs_config[i]->unlock = mt7530_mdio_regmap_unlock;
 108                 mt7531_pcs_config[i]->lock_arg = &priv->bus->mdio_lock;
 109
 110                 regmap = devm_regmap_init(priv->dev, &mt7530_regmap_bus, priv,
 111                                           mt7531_pcs_config[i]);
 112                 if (IS_ERR(regmap)) {
 113                         ret = PTR_ERR(regmap);
 114                         break;
 115                 }
 116                 pcs = mtk_pcs_lynxi_create(priv->dev, regmap,
 117                                            MT7531_PHYA_CTRL_SIGNAL3, 0);
 118                 if (!pcs) {
 119                         ret = -ENXIO;
 120                         break;
 121                 }
 122                 priv->ports[5 + i].sgmii_pcs = pcs;
 123         }
 124
 125         if (ret && i)
 126                 mtk_pcs_lynxi_destroy(priv->ports[5].sgmii_pcs);
 127
 128         return ret;
 129 }
 130
 131 static const struct of_device_id mt7530_of_match[] = {
 132         { .compatible = "mediatek,mt7621", .data = &mt753x_table[ID_MT7621], },
 133         { .compatible = "mediatek,mt7530", .data = &mt753x_table[ID_MT7530], },
 134         { .compatible = "mediatek,mt7531", .data = &mt753x_table[ID_MT7531], },
 135         { /* sentinel */ },
 136 };
 137 MODULE_DEVICE_TABLE(of, mt7530_of_match);
 138
 139 static int
 140 mt7530_probe(struct mdio_device *mdiodev)
 141 {
 142         static struct regmap_config *regmap_config;
 143         struct mt7530_priv *priv;
 144         struct device_node *dn;
 145         int ret;
 146
 147         dn = mdiodev->dev.of_node;
 148
 149         priv = devm_kzalloc(&mdiodev->dev, sizeof(*priv), GFP_KERNEL);
 150         if (!priv)
 151                 return -ENOMEM;
 152
 153         priv->bus = mdiodev->bus;
 154         priv->dev = &mdiodev->dev;
 155         priv->mdiodev = mdiodev;
 156
 157         ret = mt7530_probe_common(priv);
 158         if (ret)
 159                 return ret;
 160
 161         /* Use medatek,mcm property to distinguish hardware type that would
 162          * cause a little bit differences on power-on sequence.
 163          * Not MCM that indicates switch works as the remote standalone
 164          * integrated circuit so the GPIO pin would be used to complete
 165          * the reset, otherwise memory-mapped register accessing used
 166          * through syscon provides in the case of MCM.
 167          */
 168         priv->mcm = of_property_read_bool(dn, "mediatek,mcm");
 169         if (priv->mcm) {
 170                 dev_info(&mdiodev->dev, "MT7530 adapts as multi-chip module\n");
 171
 172                 priv->rstc = devm_reset_control_get(&mdiodev->dev, "mcm");
 173                 if (IS_ERR(priv->rstc)) {
 174                         dev_err(&mdiodev->dev, "Couldn't get our reset line\n");
 175                         return PTR_ERR(priv->rstc);
 176                 }
 177         } else {
 178                 priv->reset = devm_gpiod_get_optional(&mdiodev->dev, "reset",
 179                                                       GPIOD_OUT_LOW);
 180                 if (IS_ERR(priv->reset)) {
 181                         dev_err(&mdiodev->dev, "Couldn't get our reset line\n");
 182                         return PTR_ERR(priv->reset);
 183                 }
 184         }
 185
 186         if (priv->id == ID_MT7530) {
 187                 priv->core_pwr = devm_regulator_get(&mdiodev->dev, "core");
 188                 if (IS_ERR(priv->core_pwr))
 189                         return PTR_ERR(priv->core_pwr);
 190
 191                 priv->io_pwr = devm_regulator_get(&mdiodev->dev, "io");
 192                 if (IS_ERR(priv->io_pwr))
 193                         return PTR_ERR(priv->io_pwr);
 194         }
 195
 196         regmap_config = devm_kzalloc(&mdiodev->dev, sizeof(*regmap_config),
 197                                      GFP_KERNEL);
 198         if (!regmap_config)
 199                 return -ENOMEM;
 200
 201         regmap_config->reg_bits = 16;
 202         regmap_config->val_bits = 32;
 203         regmap_config->reg_stride = 4;
 204         regmap_config->max_register = MT7530_CREV;
 205         regmap_config->disable_locking = true;
 206         priv->regmap = devm_regmap_init(priv->dev, &mt7530_regmap_bus, priv,
 207                                         regmap_config);
 208         if (IS_ERR(priv->regmap))
 209                 return PTR_ERR(priv->regmap);
 210
 211         if (priv->id == ID_MT7531)
 212                 priv->create_sgmii = mt7531_create_sgmii;
 213
 214         return dsa_register_switch(priv->ds);
 215 }
 216
 217 static void
 218 mt7530_remove(struct mdio_device *mdiodev)
 219 {
 220         struct mt7530_priv *priv = dev_get_drvdata(&mdiodev->dev);
 221         int ret = 0, i;
 222
 223         if (!priv)
 224                 return;
 225
 226         ret = regulator_disable(priv->core_pwr);
 227         if (ret < 0)
 228                 dev_err(priv->dev,
 229                         "Failed to disable core power: %d\n", ret);
 230
 231         ret = regulator_disable(priv->io_pwr);
 232         if (ret < 0)
 233                 dev_err(priv->dev, "Failed to disable io pwr: %d\n",
 234                         ret);
 235
 236         mt7530_remove_common(priv);
 237
 238         for (i = 0; i < 2; ++i)
 239                 mtk_pcs_lynxi_destroy(priv->ports[5 + i].sgmii_pcs);
 240 }
 241
 242 static void mt7530_shutdown(struct mdio_device *mdiodev)
 243 {
 244         struct mt7530_priv *priv = dev_get_drvdata(&mdiodev->dev);
 245
 246         if (!priv)
 247                 return;
 248
 249         dsa_switch_shutdown(priv->ds);
 250
 251         dev_set_drvdata(&mdiodev->dev, NULL);
 252 }
 253
 254 static struct mdio_driver mt7530_mdio_driver = {
 255         .probe  = mt7530_probe,
 256         .remove = mt7530_remove,
 257         .shutdown = mt7530_shutdown,
 258         .mdiodrv.driver = {
 259                 .name = "mt7530-mdio",
 260                 .of_match_table = mt7530_of_match,
 261         },
 262 };
 263
 264 mdio_module_driver(mt7530_mdio_driver);
 265
 266 MODULE_AUTHOR("Sean Wang <[email protected]>");
 267 MODULE_DESCRIPTION("Driver for Mediatek MT7530 Switch (MDIO)");
 268 MODULE_LICENSE("GPL");