root/drivers/net/dsa/mv88e6060.c

DEFINITIONS

1. reg_read
2. reg_write
3. mv88e6060_get_name
4. mv88e6060_get_tag_protocol
5. mv88e6060_switch_reset
6. mv88e6060_setup_global
7. mv88e6060_setup_port
8. mv88e6060_setup_addr
9. mv88e6060_setup
10. mv88e6060_port_to_phy_addr
11. mv88e6060_phy_read
12. mv88e6060_phy_write
13. mv88e6060_probe
14. mv88e6060_remove

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