drivers/net/dsa/mv88e6060.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * net/dsa/mv88e6060.c - Driver for Marvell 88e6060 switch chips
   4  * Copyright (c) 2008-2009 Marvell Semiconductor
   5  */
   6
   7 #include <linux/delay.h>
   8 #include <linux/etherdevice.h>
   9 #include <linux/jiffies.h>
  10 #include <linux/list.h>
  11 #include <linux/module.h>
  12 #include <linux/netdevice.h>
  13 #include <linux/phy.h>
  14 #include <net/dsa.h>
  15 #include "mv88e6060.h"
  16
  17 static int reg_read(struct mv88e6060_priv *priv, int addr, int reg)
  18 {
  19         return mdiobus_read_nested(priv->bus, priv->sw_addr + addr, reg);
  20 }
  21
  22 static int reg_write(struct mv88e6060_priv *priv, int addr, int reg, u16 val)
  23 {
  24         return mdiobus_write_nested(priv->bus, priv->sw_addr + addr, reg, val);
  25 }
  26
  27 static const char *mv88e6060_get_name(struct mii_bus *bus, int sw_addr)
  28 {
  29         int ret;
  30
  31         ret = mdiobus_read(bus, sw_addr + REG_PORT(0), PORT_SWITCH_ID);
  32         if (ret >= 0) {
  33                 if (ret == PORT_SWITCH_ID_6060)
  34                         return "Marvell 88E6060 (A0)";
  35                 if (ret == PORT_SWITCH_ID_6060_R1 ||
  36                     ret == PORT_SWITCH_ID_6060_R2)
  37                         return "Marvell 88E6060 (B0)";
  38                 if ((ret & PORT_SWITCH_ID_6060_MASK) == PORT_SWITCH_ID_6060)
  39                         return "Marvell 88E6060";
  40         }
  41
  42         return NULL;
  43 }
  44
  45 static enum dsa_tag_protocol mv88e6060_get_tag_protocol(struct dsa_switch *ds,
  46                                                         int port,
  47                                                         enum dsa_tag_protocol m)
  48 {
  49         return DSA_TAG_PROTO_TRAILER;
  50 }
  51
  52 static int mv88e6060_switch_reset(struct mv88e6060_priv *priv)
  53 {
  54         int i;
  55         int ret;
  56         unsigned long timeout;
  57
  58         /* Set all ports to the disabled state. */
  59         for (i = 0; i < MV88E6060_PORTS; i++) {
  60                 ret = reg_read(priv, REG_PORT(i), PORT_CONTROL);
  61                 if (ret < 0)
  62                         return ret;
  63                 ret = reg_write(priv, REG_PORT(i), PORT_CONTROL,
  64                                 ret & ~PORT_CONTROL_STATE_MASK);
  65                 if (ret)
  66                         return ret;
  67         }
  68
  69         /* Wait for transmit queues to drain. */
  70         usleep_range(2000, 4000);
  71
  72         /* Reset the switch. */
  73         ret = reg_write(priv, REG_GLOBAL, GLOBAL_ATU_CONTROL,
  74                         GLOBAL_ATU_CONTROL_SWRESET |
  75                         GLOBAL_ATU_CONTROL_LEARNDIS);
  76         if (ret)
  77                 return ret;
  78
  79         /* Wait up to one second for reset to complete. */
  80         timeout = jiffies + 1 * HZ;
  81         while (time_before(jiffies, timeout)) {
  82                 ret = reg_read(priv, REG_GLOBAL, GLOBAL_STATUS);
  83                 if (ret < 0)
  84                         return ret;
  85
  86                 if (ret & GLOBAL_STATUS_INIT_READY)
  87                         break;
  88
  89                 usleep_range(1000, 2000);
  90         }
  91         if (time_after(jiffies, timeout))
  92                 return -ETIMEDOUT;
  93
  94         return 0;
  95 }
  96
  97 static int mv88e6060_setup_global(struct mv88e6060_priv *priv)
  98 {
  99         int ret;
 100
 101         /* Disable discarding of frames with excessive collisions,
 102          * set the maximum frame size to 1536 bytes, and mask all
 103          * interrupt sources.
 104          */
 105         ret = reg_write(priv, REG_GLOBAL, GLOBAL_CONTROL,
 106                         GLOBAL_CONTROL_MAX_FRAME_1536);
 107         if (ret)
 108                 return ret;
 109
 110         /* Disable automatic address learning.
 111          */
 112         return reg_write(priv, REG_GLOBAL, GLOBAL_ATU_CONTROL,
 113                          GLOBAL_ATU_CONTROL_LEARNDIS);
 114 }
 115
 116 static int mv88e6060_setup_port(struct mv88e6060_priv *priv, int p)
 117 {
 118         int addr = REG_PORT(p);
 119         int ret;
 120
 121         /* Do not force flow control, disable Ingress and Egress
 122          * Header tagging, disable VLAN tunneling, and set the port
 123          * state to Forwarding.  Additionally, if this is the CPU
 124          * port, enable Ingress and Egress Trailer tagging mode.
 125          */
 126         ret = reg_write(priv, addr, PORT_CONTROL,
 127                         dsa_is_cpu_port(priv->ds, p) ?
 128                         PORT_CONTROL_TRAILER |
 129                         PORT_CONTROL_INGRESS_MODE |
 130                         PORT_CONTROL_STATE_FORWARDING :
 131                         PORT_CONTROL_STATE_FORWARDING);
 132         if (ret)
 133                 return ret;
 134
 135         /* Port based VLAN map: give each port its own address
 136          * database, allow the CPU port to talk to each of the 'real'
 137          * ports, and allow each of the 'real' ports to only talk to
 138          * the CPU port.
 139          */
 140         ret = reg_write(priv, addr, PORT_VLAN_MAP,
 141                         ((p & 0xf) << PORT_VLAN_MAP_DBNUM_SHIFT) |
 142                         (dsa_is_cpu_port(priv->ds, p) ?
 143                          dsa_user_ports(priv->ds) :
 144                          BIT(dsa_to_port(priv->ds, p)->cpu_dp->index)));
 145         if (ret)
 146                 return ret;
 147
 148         /* Port Association Vector: when learning source addresses
 149          * of packets, add the address to the address database using
 150          * a port bitmap that has only the bit for this port set and
 151          * the other bits clear.
 152          */
 153         return reg_write(priv, addr, PORT_ASSOC_VECTOR, BIT(p));
 154 }
 155
 156 static int mv88e6060_setup_addr(struct mv88e6060_priv *priv)
 157 {
 158         u8 addr[ETH_ALEN];
 159         int ret;
 160         u16 val;
 161
 162         eth_random_addr(addr);
 163
 164         val = addr[0] << 8 | addr[1];
 165
 166         /* The multicast bit is always transmitted as a zero, so the switch uses
 167          * bit 8 for "DiffAddr", where 0 means all ports transmit the same SA.
 168          */
 169         val &= 0xfeff;
 170
 171         ret = reg_write(priv, REG_GLOBAL, GLOBAL_MAC_01, val);
 172         if (ret)
 173                 return ret;
 174
 175         ret = reg_write(priv, REG_GLOBAL, GLOBAL_MAC_23,
 176                         (addr[2] << 8) | addr[3]);
 177         if (ret)
 178                 return ret;
 179
 180         return reg_write(priv, REG_GLOBAL, GLOBAL_MAC_45,
 181                          (addr[4] << 8) | addr[5]);
 182 }
 183
 184 static int mv88e6060_setup(struct dsa_switch *ds)
 185 {
 186         struct mv88e6060_priv *priv = ds->priv;
 187         int ret;
 188         int i;
 189
 190         priv->ds = ds;
 191
 192         ret = mv88e6060_switch_reset(priv);
 193         if (ret < 0)
 194                 return ret;
 195
 196         /* @@@ initialise atu */
 197
 198         ret = mv88e6060_setup_global(priv);
 199         if (ret < 0)
 200                 return ret;
 201
 202         ret = mv88e6060_setup_addr(priv);
 203         if (ret < 0)
 204                 return ret;
 205
 206         for (i = 0; i < MV88E6060_PORTS; i++) {
 207                 ret = mv88e6060_setup_port(priv, i);
 208                 if (ret < 0)
 209                         return ret;
 210         }
 211
 212         return 0;
 213 }
 214
 215 static int mv88e6060_port_to_phy_addr(int port)
 216 {
 217         if (port >= 0 && port < MV88E6060_PORTS)
 218                 return port;
 219         return -1;
 220 }
 221
 222 static int mv88e6060_phy_read(struct dsa_switch *ds, int port, int regnum)
 223 {
 224         struct mv88e6060_priv *priv = ds->priv;
 225         int addr;
 226
 227         addr = mv88e6060_port_to_phy_addr(port);
 228         if (addr == -1)
 229                 return 0xffff;
 230
 231         return reg_read(priv, addr, regnum);
 232 }
 233
 234 static int
 235 mv88e6060_phy_write(struct dsa_switch *ds, int port, int regnum, u16 val)
 236 {
 237         struct mv88e6060_priv *priv = ds->priv;
 238         int addr;
 239
 240         addr = mv88e6060_port_to_phy_addr(port);
 241         if (addr == -1)
 242                 return 0xffff;
 243
 244         return reg_write(priv, addr, regnum, val);
 245 }
 246
 247 static const struct dsa_switch_ops mv88e6060_switch_ops = {
 248         .get_tag_protocol = mv88e6060_get_tag_protocol,
 249         .setup          = mv88e6060_setup,
 250         .phy_read       = mv88e6060_phy_read,
 251         .phy_write      = mv88e6060_phy_write,
 252 };
 253
 254 static int mv88e6060_probe(struct mdio_device *mdiodev)
 255 {
 256         struct device *dev = &mdiodev->dev;
 257         struct mv88e6060_priv *priv;
 258         struct dsa_switch *ds;
 259         const char *name;
 260
 261         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 262         if (!priv)
 263                 return -ENOMEM;
 264
 265         priv->bus = mdiodev->bus;
 266         priv->sw_addr = mdiodev->addr;
 267
 268         name = mv88e6060_get_name(priv->bus, priv->sw_addr);
 269         if (!name)
 270                 return -ENODEV;
 271
 272         dev_info(dev, "switch %s detected\n", name);
 273
 274         ds = devm_kzalloc(dev, sizeof(*ds), GFP_KERNEL);
 275         if (!ds)
 276                 return -ENOMEM;
 277
 278         ds->dev = dev;
 279         ds->num_ports = MV88E6060_PORTS;
 280         ds->priv = priv;
 281         ds->dev = dev;
 282         ds->ops = &mv88e6060_switch_ops;
 283
 284         dev_set_drvdata(dev, ds);
 285
 286         return dsa_register_switch(ds);
 287 }
 288
 289 static void mv88e6060_remove(struct mdio_device *mdiodev)
 290 {
 291         struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
 292
 293         dsa_unregister_switch(ds);
 294 }
 295
 296 static const struct of_device_id mv88e6060_of_match[] = {
 297         {
 298                 .compatible = "marvell,mv88e6060",
 299         },
 300         { /* sentinel */ },
 301 };
 302
 303 static struct mdio_driver mv88e6060_driver = {
 304         .probe  = mv88e6060_probe,
 305         .remove = mv88e6060_remove,
 306         .mdiodrv.driver = {
 307                 .name = "mv88e6060",
 308                 .of_match_table = mv88e6060_of_match,
 309         },
 310 };
 311
 312 mdio_module_driver(mv88e6060_driver);
 313
 314 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
 315 MODULE_DESCRIPTION("Driver for Marvell 88E6060 ethernet switch chip");
 316 MODULE_LICENSE("GPL");
 317 MODULE_ALIAS("platform:mv88e6060");