net/mdio-uclass.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2019
   4  * Alex Marginean, NXP
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <malloc.h>
  10 #include <miiphy.h>
  11 #include <dm/device-internal.h>
  12 #include <dm/device_compat.h>
  13 #include <dm/uclass-internal.h>
  14 #include <linux/compat.h>
  15
  16 /* DT node properties for MAC-PHY interface */
  17 #define PHY_MODE_STR_CNT        2
  18 static const char *phy_mode_str[PHY_MODE_STR_CNT] = { "phy-mode",
  19                                                       "phy-connection-type" };
  20 /* DT node properties that reference a PHY node */
  21 #define PHY_HANDLE_STR_CNT      3
  22 const char *phy_handle_str[PHY_HANDLE_STR_CNT] = { "phy-handle",
  23                                                    "phy",
  24                                                    "phy-device" };
  25
  26 void dm_mdio_probe_devices(void)
  27 {
  28         struct udevice *it;
  29         struct uclass *uc;
  30
  31         uclass_get(UCLASS_MDIO, &uc);
  32         uclass_foreach_dev(it, uc) {
  33                 device_probe(it);
  34         }
  35 }
  36
  37 static int dm_mdio_post_bind(struct udevice *dev)
  38 {
  39         const char *dt_name;
  40
  41         /* set a custom name for the MDIO device, if present in DT */
  42         if (ofnode_valid(dev->node)) {
  43                 dt_name = ofnode_read_string(dev->node, "device-name");
  44                 if (dt_name) {
  45                         debug("renaming dev %s to %s\n", dev->name, dt_name);
  46                         device_set_name(dev, dt_name);
  47                 }
  48         }
  49
  50         /*
  51          * MDIO command doesn't like spaces in names, don't allow them to keep
  52          * it happy
  53          */
  54         if (strchr(dev->name, ' ')) {
  55                 debug("\nError: MDIO device name \"%s\" has a space!\n",
  56                       dev->name);
  57                 return -EINVAL;
  58         }
  59
  60         return 0;
  61 }
  62
  63 /*
  64  * Following read/write/reset functions are registered with legacy MII code.
  65  * These are called for PHY operations by upper layers and we further call the
  66  * DM MDIO driver functions.
  67  */
  68 static int mdio_read(struct mii_dev *mii_bus, int addr, int devad, int reg)
  69 {
  70         struct udevice *dev = mii_bus->priv;
  71
  72         return mdio_get_ops(dev)->read(dev, addr, devad, reg);
  73 }
  74
  75 static int mdio_write(struct mii_dev *mii_bus, int addr, int devad, int reg,
  76                       u16 val)
  77 {
  78         struct udevice *dev = mii_bus->priv;
  79
  80         return mdio_get_ops(dev)->write(dev, addr, devad, reg, val);
  81 }
  82
  83 static int mdio_reset(struct mii_dev *mii_bus)
  84 {
  85         struct udevice *dev = mii_bus->priv;
  86
  87         if (mdio_get_ops(dev)->reset)
  88                 return mdio_get_ops(dev)->reset(dev);
  89         else
  90                 return 0;
  91 }
  92
  93 static int dm_mdio_post_probe(struct udevice *dev)
  94 {
  95         struct mdio_perdev_priv *pdata = dev_get_uclass_priv(dev);
  96
  97         pdata->mii_bus = mdio_alloc();
  98         pdata->mii_bus->read = mdio_read;
  99         pdata->mii_bus->write = mdio_write;
 100         pdata->mii_bus->reset = mdio_reset;
 101         pdata->mii_bus->priv = dev;
 102         strncpy(pdata->mii_bus->name, dev->name, MDIO_NAME_LEN - 1);
 103
 104         return mdio_register(pdata->mii_bus);
 105 }
 106
 107 static int dm_mdio_pre_remove(struct udevice *dev)
 108 {
 109         struct mdio_perdev_priv *pdata = dev_get_uclass_priv(dev);
 110         struct mdio_ops *ops = mdio_get_ops(dev);
 111
 112         if (ops->reset)
 113                 ops->reset(dev);
 114         mdio_unregister(pdata->mii_bus);
 115         mdio_free(pdata->mii_bus);
 116
 117         return 0;
 118 }
 119
 120 struct phy_device *dm_mdio_phy_connect(struct udevice *mdiodev, int phyaddr,
 121                                        struct udevice *ethdev,
 122                                        phy_interface_t interface)
 123 {
 124         struct mdio_perdev_priv *pdata = dev_get_uclass_priv(mdiodev);
 125
 126         if (device_probe(mdiodev))
 127                 return NULL;
 128
 129         return phy_connect(pdata->mii_bus, phyaddr, ethdev, interface);
 130 }
 131
 132 static struct phy_device *dm_eth_connect_phy_handle(struct udevice *ethdev,
 133                                                     phy_interface_t interface)
 134 {
 135         u32 phy_addr;
 136         struct udevice *mdiodev;
 137         struct phy_device *phy;
 138         struct ofnode_phandle_args phandle = {.node = ofnode_null()};
 139         int i;
 140
 141         for (i = 0; i < PHY_HANDLE_STR_CNT; i++)
 142                 if (!dev_read_phandle_with_args(ethdev, phy_handle_str[i], NULL,
 143                                                 0, 0, &phandle))
 144                         break;
 145
 146         if (!ofnode_valid(phandle.node)) {
 147                 dev_dbg(dev, "can't find PHY node\n");
 148                 return NULL;
 149         }
 150
 151         /*
 152          * reading 'reg' directly should be fine.  This is a PHY node, the
 153          * address is always size 1 and requires no translation
 154          */
 155         if (ofnode_read_u32(phandle.node, "reg", &phy_addr)) {
 156                 dev_dbg(ethdev, "missing reg property in phy node\n");
 157                 return NULL;
 158         }
 159
 160         if (uclass_get_device_by_ofnode(UCLASS_MDIO,
 161                                         ofnode_get_parent(phandle.node),
 162                                         &mdiodev)) {
 163                 dev_dbg(dev, "can't find MDIO bus for node %s\n",
 164                         ofnode_get_name(ofnode_get_parent(phandle.node)));
 165                 return NULL;
 166         }
 167
 168         phy = dm_mdio_phy_connect(mdiodev, phy_addr, ethdev, interface);
 169
 170         if (phy)
 171                 phy->node = phandle.node;
 172
 173         return phy;
 174 }
 175
 176 /* Connect to a PHY linked in eth DT node */
 177 struct phy_device *dm_eth_phy_connect(struct udevice *ethdev)
 178 {
 179         const char *if_str;
 180         phy_interface_t interface;
 181         struct phy_device *phy;
 182         int i;
 183
 184         if (!ofnode_valid(ethdev->node)) {
 185                 debug("%s: supplied eth dev has no DT node!\n", ethdev->name);
 186                 return NULL;
 187         }
 188
 189         interface = PHY_INTERFACE_MODE_NONE;
 190         for (i = 0; i < PHY_MODE_STR_CNT; i++) {
 191                 if_str = ofnode_read_string(ethdev->node, phy_mode_str[i]);
 192                 if (if_str) {
 193                         interface = phy_get_interface_by_name(if_str);
 194                         break;
 195                 }
 196         }
 197         if (interface < 0)
 198                 interface = PHY_INTERFACE_MODE_NONE;
 199         if (interface == PHY_INTERFACE_MODE_NONE)
 200                 dev_dbg(ethdev, "can't find interface mode, default to NONE\n");
 201
 202         phy = dm_eth_connect_phy_handle(ethdev, interface);
 203
 204         if (!phy)
 205                 return NULL;
 206
 207         phy->interface = interface;
 208
 209         return phy;
 210 }
 211
 212 UCLASS_DRIVER(mdio) = {
 213         .id = UCLASS_MDIO,
 214         .name = "mdio",
 215         .post_bind  = dm_mdio_post_bind,
 216         .post_probe = dm_mdio_post_probe,
 217         .pre_remove = dm_mdio_pre_remove,
 218         .per_device_auto_alloc_size = sizeof(struct mdio_perdev_priv),
 219 };