drivers/net/dsa/mv88e6060.c

   1 /*
   2  * net/dsa/mv88e6060.c - Driver for Marvell 88e6060 switch chips
   3  * Copyright (c) 2008-2009 Marvell Semiconductor
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10
  11 #include <linux/delay.h>
  12 #include <linux/etherdevice.h>
  13 #include <linux/jiffies.h>
  14 #include <linux/list.h>
  15 #include <linux/module.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/phy.h>
  18 #include <net/dsa.h>
  19 #include "mv88e6060.h"
  20
  21 static int reg_read(struct dsa_switch *ds, int addr, int reg)
  22 {
  23         struct mv88e6060_priv *priv = ds->priv;
  24
  25         return mdiobus_read_nested(priv->bus, priv->sw_addr + addr, reg);
  26 }
  27
  28 #define REG_READ(addr, reg)                                     \
  29         ({                                                      \
  30                 int __ret;                                      \
  31                                                                 \
  32                 __ret = reg_read(ds, addr, reg);                \
  33                 if (__ret < 0)                                  \
  34                         return __ret;                           \
  35                 __ret;                                          \
  36         })
  37
  38
  39 static int reg_write(struct dsa_switch *ds, int addr, int reg, u16 val)
  40 {
  41         struct mv88e6060_priv *priv = ds->priv;
  42
  43         return mdiobus_write_nested(priv->bus, priv->sw_addr + addr, reg, val);
  44 }
  45
  46 #define REG_WRITE(addr, reg, val)                               \
  47         ({                                                      \
  48                 int __ret;                                      \
  49                                                                 \
  50                 __ret = reg_write(ds, addr, reg, val);          \
  51                 if (__ret < 0)                                  \
  52                         return __ret;                           \
  53         })
  54
  55 static const char *mv88e6060_get_name(struct mii_bus *bus, int sw_addr)
  56 {
  57         int ret;
  58
  59         ret = mdiobus_read(bus, sw_addr + REG_PORT(0), PORT_SWITCH_ID);
  60         if (ret >= 0) {
  61                 if (ret == PORT_SWITCH_ID_6060)
  62                         return "Marvell 88E6060 (A0)";
  63                 if (ret == PORT_SWITCH_ID_6060_R1 ||
  64                     ret == PORT_SWITCH_ID_6060_R2)
  65                         return "Marvell 88E6060 (B0)";
  66                 if ((ret & PORT_SWITCH_ID_6060_MASK) == PORT_SWITCH_ID_6060)
  67                         return "Marvell 88E6060";
  68         }
  69
  70         return NULL;
  71 }
  72
  73 static enum dsa_tag_protocol mv88e6060_get_tag_protocol(struct dsa_switch *ds,
  74                                                         int port)
  75 {
  76         return DSA_TAG_PROTO_TRAILER;
  77 }
  78
  79 static const char *mv88e6060_drv_probe(struct device *dsa_dev,
  80                                        struct device *host_dev, int sw_addr,
  81                                        void **_priv)
  82 {
  83         struct mii_bus *bus = dsa_host_dev_to_mii_bus(host_dev);
  84         struct mv88e6060_priv *priv;
  85         const char *name;
  86
  87         name = mv88e6060_get_name(bus, sw_addr);
  88         if (name) {
  89                 priv = devm_kzalloc(dsa_dev, sizeof(*priv), GFP_KERNEL);
  90                 if (!priv)
  91                         return NULL;
  92                 *_priv = priv;
  93                 priv->bus = bus;
  94                 priv->sw_addr = sw_addr;
  95         }
  96
  97         return name;
  98 }
  99
 100 static int mv88e6060_switch_reset(struct dsa_switch *ds)
 101 {
 102         int i;
 103         int ret;
 104         unsigned long timeout;
 105
 106         /* Set all ports to the disabled state. */
 107         for (i = 0; i < MV88E6060_PORTS; i++) {
 108                 ret = REG_READ(REG_PORT(i), PORT_CONTROL);
 109                 REG_WRITE(REG_PORT(i), PORT_CONTROL,
 110                           ret & ~PORT_CONTROL_STATE_MASK);
 111         }
 112
 113         /* Wait for transmit queues to drain. */
 114         usleep_range(2000, 4000);
 115
 116         /* Reset the switch. */
 117         REG_WRITE(REG_GLOBAL, GLOBAL_ATU_CONTROL,
 118                   GLOBAL_ATU_CONTROL_SWRESET |
 119                   GLOBAL_ATU_CONTROL_LEARNDIS);
 120
 121         /* Wait up to one second for reset to complete. */
 122         timeout = jiffies + 1 * HZ;
 123         while (time_before(jiffies, timeout)) {
 124                 ret = REG_READ(REG_GLOBAL, GLOBAL_STATUS);
 125                 if (ret & GLOBAL_STATUS_INIT_READY)
 126                         break;
 127
 128                 usleep_range(1000, 2000);
 129         }
 130         if (time_after(jiffies, timeout))
 131                 return -ETIMEDOUT;
 132
 133         return 0;
 134 }
 135
 136 static int mv88e6060_setup_global(struct dsa_switch *ds)
 137 {
 138         /* Disable discarding of frames with excessive collisions,
 139          * set the maximum frame size to 1536 bytes, and mask all
 140          * interrupt sources.
 141          */
 142         REG_WRITE(REG_GLOBAL, GLOBAL_CONTROL, GLOBAL_CONTROL_MAX_FRAME_1536);
 143
 144         /* Disable automatic address learning.
 145          */
 146         REG_WRITE(REG_GLOBAL, GLOBAL_ATU_CONTROL,
 147                   GLOBAL_ATU_CONTROL_LEARNDIS);
 148
 149         return 0;
 150 }
 151
 152 static int mv88e6060_setup_port(struct dsa_switch *ds, int p)
 153 {
 154         int addr = REG_PORT(p);
 155
 156         /* Do not force flow control, disable Ingress and Egress
 157          * Header tagging, disable VLAN tunneling, and set the port
 158          * state to Forwarding.  Additionally, if this is the CPU
 159          * port, enable Ingress and Egress Trailer tagging mode.
 160          */
 161         REG_WRITE(addr, PORT_CONTROL,
 162                   dsa_is_cpu_port(ds, p) ?
 163                         PORT_CONTROL_TRAILER |
 164                         PORT_CONTROL_INGRESS_MODE |
 165                         PORT_CONTROL_STATE_FORWARDING :
 166                         PORT_CONTROL_STATE_FORWARDING);
 167
 168         /* Port based VLAN map: give each port its own address
 169          * database, allow the CPU port to talk to each of the 'real'
 170          * ports, and allow each of the 'real' ports to only talk to
 171          * the CPU port.
 172          */
 173         REG_WRITE(addr, PORT_VLAN_MAP,
 174                   ((p & 0xf) << PORT_VLAN_MAP_DBNUM_SHIFT) |
 175                    (dsa_is_cpu_port(ds, p) ? dsa_user_ports(ds) :
 176                     BIT(dsa_to_port(ds, p)->cpu_dp->index)));
 177
 178         /* Port Association Vector: when learning source addresses
 179          * of packets, add the address to the address database using
 180          * a port bitmap that has only the bit for this port set and
 181          * the other bits clear.
 182          */
 183         REG_WRITE(addr, PORT_ASSOC_VECTOR, BIT(p));
 184
 185         return 0;
 186 }
 187
 188 static int mv88e6060_setup_addr(struct dsa_switch *ds)
 189 {
 190         u8 addr[ETH_ALEN];
 191         u16 val;
 192
 193         eth_random_addr(addr);
 194
 195         val = addr[0] << 8 | addr[1];
 196
 197         /* The multicast bit is always transmitted as a zero, so the switch uses
 198          * bit 8 for "DiffAddr", where 0 means all ports transmit the same SA.
 199          */
 200         val &= 0xfeff;
 201
 202         REG_WRITE(REG_GLOBAL, GLOBAL_MAC_01, val);
 203         REG_WRITE(REG_GLOBAL, GLOBAL_MAC_23, (addr[2] << 8) | addr[3]);
 204         REG_WRITE(REG_GLOBAL, GLOBAL_MAC_45, (addr[4] << 8) | addr[5]);
 205
 206         return 0;
 207 }
 208
 209 static int mv88e6060_setup(struct dsa_switch *ds)
 210 {
 211         int ret;
 212         int i;
 213
 214         ret = mv88e6060_switch_reset(ds);
 215         if (ret < 0)
 216                 return ret;
 217
 218         /* @@@ initialise atu */
 219
 220         ret = mv88e6060_setup_global(ds);
 221         if (ret < 0)
 222                 return ret;
 223
 224         ret = mv88e6060_setup_addr(ds);
 225         if (ret < 0)
 226                 return ret;
 227
 228         for (i = 0; i < MV88E6060_PORTS; i++) {
 229                 ret = mv88e6060_setup_port(ds, i);
 230                 if (ret < 0)
 231                         return ret;
 232         }
 233
 234         return 0;
 235 }
 236
 237 static int mv88e6060_port_to_phy_addr(int port)
 238 {
 239         if (port >= 0 && port < MV88E6060_PORTS)
 240                 return port;
 241         return -1;
 242 }
 243
 244 static int mv88e6060_phy_read(struct dsa_switch *ds, int port, int regnum)
 245 {
 246         int addr;
 247
 248         addr = mv88e6060_port_to_phy_addr(port);
 249         if (addr == -1)
 250                 return 0xffff;
 251
 252         return reg_read(ds, addr, regnum);
 253 }
 254
 255 static int
 256 mv88e6060_phy_write(struct dsa_switch *ds, int port, int regnum, u16 val)
 257 {
 258         int addr;
 259
 260         addr = mv88e6060_port_to_phy_addr(port);
 261         if (addr == -1)
 262                 return 0xffff;
 263
 264         return reg_write(ds, addr, regnum, val);
 265 }
 266
 267 static const struct dsa_switch_ops mv88e6060_switch_ops = {
 268         .get_tag_protocol = mv88e6060_get_tag_protocol,
 269         .probe          = mv88e6060_drv_probe,
 270         .setup          = mv88e6060_setup,
 271         .phy_read       = mv88e6060_phy_read,
 272         .phy_write      = mv88e6060_phy_write,
 273 };
 274
 275 static struct dsa_switch_driver mv88e6060_switch_drv = {
 276         .ops            = &mv88e6060_switch_ops,
 277 };
 278
 279 static int __init mv88e6060_init(void)
 280 {
 281         register_switch_driver(&mv88e6060_switch_drv);
 282         return 0;
 283 }
 284 module_init(mv88e6060_init);
 285
 286 static void __exit mv88e6060_cleanup(void)
 287 {
 288         unregister_switch_driver(&mv88e6060_switch_drv);
 289 }
 290 module_exit(mv88e6060_cleanup);
 291
 292 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
 293 MODULE_DESCRIPTION("Driver for Marvell 88E6060 ethernet switch chip");
 294 MODULE_LICENSE("GPL");
 295 MODULE_ALIAS("platform:mv88e6060");