net/dsa/mv88e6060.c

   1 /*
   2  * net/dsa/mv88e6060.c - Driver for Marvell 88e6060 switch chips
   3  * Copyright (c) 2008 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/list.h>
  12 #include <linux/netdevice.h>
  13 #include <linux/phy.h>
  14 #include "dsa_priv.h"
  15
  16 #define REG_PORT(p)             (8 + (p))
  17 #define REG_GLOBAL              0x0f
  18
  19 static int reg_read(struct dsa_switch *ds, int addr, int reg)
  20 {
  21         return mdiobus_read(ds->master_mii_bus, addr, reg);
  22 }
  23
  24 #define REG_READ(addr, reg)                                     \
  25         ({                                                      \
  26                 int __ret;                                      \
  27                                                                 \
  28                 __ret = reg_read(ds, addr, reg);                \
  29                 if (__ret < 0)                                  \
  30                         return __ret;                           \
  31                 __ret;                                          \
  32         })
  33
  34
  35 static int reg_write(struct dsa_switch *ds, int addr, int reg, u16 val)
  36 {
  37         return mdiobus_write(ds->master_mii_bus, addr, reg, val);
  38 }
  39
  40 #define REG_WRITE(addr, reg, val)                               \
  41         ({                                                      \
  42                 int __ret;                                      \
  43                                                                 \
  44                 __ret = reg_write(ds, addr, reg, val);          \
  45                 if (__ret < 0)                                  \
  46                         return __ret;                           \
  47         })
  48
  49 static char *mv88e6060_probe(struct mii_bus *bus, int sw_addr)
  50 {
  51         int ret;
  52
  53         ret = mdiobus_read(bus, REG_PORT(0), 0x03);
  54         if (ret >= 0) {
  55                 ret &= 0xfff0;
  56                 if (ret == 0x0600)
  57                         return "Marvell 88E6060";
  58         }
  59
  60         return NULL;
  61 }
  62
  63 static int mv88e6060_switch_reset(struct dsa_switch *ds)
  64 {
  65         int i;
  66         int ret;
  67
  68         /*
  69          * Set all ports to the disabled state.
  70          */
  71         for (i = 0; i < 6; i++) {
  72                 ret = REG_READ(REG_PORT(i), 0x04);
  73                 REG_WRITE(REG_PORT(i), 0x04, ret & 0xfffc);
  74         }
  75
  76         /*
  77          * Wait for transmit queues to drain.
  78          */
  79         msleep(2);
  80
  81         /*
  82          * Reset the switch.
  83          */
  84         REG_WRITE(REG_GLOBAL, 0x0A, 0xa130);
  85
  86         /*
  87          * Wait up to one second for reset to complete.
  88          */
  89         for (i = 0; i < 1000; i++) {
  90                 ret = REG_READ(REG_GLOBAL, 0x00);
  91                 if ((ret & 0x8000) == 0x0000)
  92                         break;
  93
  94                 msleep(1);
  95         }
  96         if (i == 1000)
  97                 return -ETIMEDOUT;
  98
  99         return 0;
 100 }
 101
 102 static int mv88e6060_setup_global(struct dsa_switch *ds)
 103 {
 104         /*
 105          * Disable discarding of frames with excessive collisions,
 106          * set the maximum frame size to 1536 bytes, and mask all
 107          * interrupt sources.
 108          */
 109         REG_WRITE(REG_GLOBAL, 0x04, 0x0800);
 110
 111         /*
 112          * Enable automatic address learning, set the address
 113          * database size to 1024 entries, and set the default aging
 114          * time to 5 minutes.
 115          */
 116         REG_WRITE(REG_GLOBAL, 0x0a, 0x2130);
 117
 118         return 0;
 119 }
 120
 121 static int mv88e6060_setup_port(struct dsa_switch *ds, int p)
 122 {
 123         int addr = REG_PORT(p);
 124
 125         /*
 126          * Do not force flow control, disable Ingress and Egress
 127          * Header tagging, disable VLAN tunneling, and set the port
 128          * state to Forwarding.  Additionally, if this is the CPU
 129          * port, enable Ingress and Egress Trailer tagging mode.
 130          */
 131         REG_WRITE(addr, 0x04, (p == ds->cpu_port) ? 0x4103 : 0x0003);
 132
 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         REG_WRITE(addr, 0x06,
 140                         ((p & 0xf) << 12) |
 141                          ((p == ds->cpu_port) ?
 142                                 ds->valid_port_mask :
 143                                 (1 << ds->cpu_port)));
 144
 145         /*
 146          * Port Association Vector: when learning source addresses
 147          * of packets, add the address to the address database using
 148          * a port bitmap that has only the bit for this port set and
 149          * the other bits clear.
 150          */
 151         REG_WRITE(addr, 0x0b, 1 << p);
 152
 153         return 0;
 154 }
 155
 156 static int mv88e6060_setup(struct dsa_switch *ds)
 157 {
 158         int i;
 159         int ret;
 160
 161         ret = mv88e6060_switch_reset(ds);
 162         if (ret < 0)
 163                 return ret;
 164
 165         /* @@@ initialise atu */
 166
 167         ret = mv88e6060_setup_global(ds);
 168         if (ret < 0)
 169                 return ret;
 170
 171         for (i = 0; i < 6; i++) {
 172                 ret = mv88e6060_setup_port(ds, i);
 173                 if (ret < 0)
 174                         return ret;
 175         }
 176
 177         return 0;
 178 }
 179
 180 static int mv88e6060_set_addr(struct dsa_switch *ds, u8 *addr)
 181 {
 182         REG_WRITE(REG_GLOBAL, 0x01, (addr[0] << 8) | addr[1]);
 183         REG_WRITE(REG_GLOBAL, 0x02, (addr[2] << 8) | addr[3]);
 184         REG_WRITE(REG_GLOBAL, 0x03, (addr[4] << 8) | addr[5]);
 185
 186         return 0;
 187 }
 188
 189 static int mv88e6060_port_to_phy_addr(int port)
 190 {
 191         if (port >= 0 && port <= 5)
 192                 return port;
 193         return -1;
 194 }
 195
 196 static int mv88e6060_phy_read(struct dsa_switch *ds, int port, int regnum)
 197 {
 198         int addr;
 199
 200         addr = mv88e6060_port_to_phy_addr(port);
 201         if (addr == -1)
 202                 return 0xffff;
 203
 204         return reg_read(ds, addr, regnum);
 205 }
 206
 207 static int
 208 mv88e6060_phy_write(struct dsa_switch *ds, int port, int regnum, u16 val)
 209 {
 210         int addr;
 211
 212         addr = mv88e6060_port_to_phy_addr(port);
 213         if (addr == -1)
 214                 return 0xffff;
 215
 216         return reg_write(ds, addr, regnum, val);
 217 }
 218
 219 static void mv88e6060_poll_link(struct dsa_switch *ds)
 220 {
 221         int i;
 222
 223         for (i = 0; i < DSA_MAX_PORTS; i++) {
 224                 struct net_device *dev;
 225                 int uninitialized_var(port_status);
 226                 int link;
 227                 int speed;
 228                 int duplex;
 229                 int fc;
 230
 231                 dev = ds->ports[i];
 232                 if (dev == NULL)
 233                         continue;
 234
 235                 link = 0;
 236                 if (dev->flags & IFF_UP) {
 237                         port_status = reg_read(ds, REG_PORT(i), 0x00);
 238                         if (port_status < 0)
 239                                 continue;
 240
 241                         link = !!(port_status & 0x1000);
 242                 }
 243
 244                 if (!link) {
 245                         if (netif_carrier_ok(dev)) {
 246                                 printk(KERN_INFO "%s: link down\n", dev->name);
 247                                 netif_carrier_off(dev);
 248                         }
 249                         continue;
 250                 }
 251
 252                 speed = (port_status & 0x0100) ? 100 : 10;
 253                 duplex = (port_status & 0x0200) ? 1 : 0;
 254                 fc = ((port_status & 0xc000) == 0xc000) ? 1 : 0;
 255
 256                 if (!netif_carrier_ok(dev)) {
 257                         printk(KERN_INFO "%s: link up, %d Mb/s, %s duplex, "
 258                                          "flow control %sabled\n", dev->name,
 259                                          speed, duplex ? "full" : "half",
 260                                          fc ? "en" : "dis");
 261                         netif_carrier_on(dev);
 262                 }
 263         }
 264 }
 265
 266 static struct dsa_switch_driver mv88e6060_switch_driver = {
 267         .tag_protocol   = htons(ETH_P_TRAILER),
 268         .probe          = mv88e6060_probe,
 269         .setup          = mv88e6060_setup,
 270         .set_addr       = mv88e6060_set_addr,
 271         .phy_read       = mv88e6060_phy_read,
 272         .phy_write      = mv88e6060_phy_write,
 273         .poll_link      = mv88e6060_poll_link,
 274 };
 275
 276 static int __init mv88e6060_init(void)
 277 {
 278         register_switch_driver(&mv88e6060_switch_driver);
 279         return 0;
 280 }
 281 module_init(mv88e6060_init);
 282
 283 static void __exit mv88e6060_cleanup(void)
 284 {
 285         unregister_switch_driver(&mv88e6060_switch_driver);
 286 }
 287 module_exit(mv88e6060_cleanup);