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/list.h>
  12 #include <linux/module.h>
  13 #include <linux/netdevice.h>
  14 #include <linux/phy.h>
  15 #include <net/dsa.h>
  16
  17 #define REG_PORT(p)             (8 + (p))
  18 #define REG_GLOBAL              0x0f
  19
  20 static int reg_read(struct dsa_switch *ds, int addr, int reg)
  21 {
  22         return mdiobus_read(ds->master_mii_bus, ds->pd->sw_addr + addr, reg);
  23 }
  24
  25 #define REG_READ(addr, reg)                                     \
  26         ({                                                      \
  27                 int __ret;                                      \
  28                                                                 \
  29                 __ret = reg_read(ds, addr, reg);                \
  30                 if (__ret < 0)                                  \
  31                         return __ret;                           \
  32                 __ret;                                          \
  33         })
  34
  35
  36 static int reg_write(struct dsa_switch *ds, int addr, int reg, u16 val)
  37 {
  38         return mdiobus_write(ds->master_mii_bus, ds->pd->sw_addr + addr,
  39                              reg, val);
  40 }
  41
  42 #define REG_WRITE(addr, reg, val)                               \
  43         ({                                                      \
  44                 int __ret;                                      \
  45                                                                 \
  46                 __ret = reg_write(ds, addr, reg, val);          \
  47                 if (__ret < 0)                                  \
  48                         return __ret;                           \
  49         })
  50
  51 static char *mv88e6060_probe(struct mii_bus *bus, int sw_addr)
  52 {
  53         int ret;
  54
  55         ret = mdiobus_read(bus, sw_addr + REG_PORT(0), 0x03);
  56         if (ret >= 0) {
  57                 ret &= 0xfff0;
  58                 if (ret == 0x0600)
  59                         return "Marvell 88E6060";
  60         }
  61
  62         return NULL;
  63 }
  64
  65 static int mv88e6060_switch_reset(struct dsa_switch *ds)
  66 {
  67         int i;
  68         int ret;
  69
  70         /*
  71          * Set all ports to the disabled state.
  72          */
  73         for (i = 0; i < 6; i++) {
  74                 ret = REG_READ(REG_PORT(i), 0x04);
  75                 REG_WRITE(REG_PORT(i), 0x04, ret & 0xfffc);
  76         }
  77
  78         /*
  79          * Wait for transmit queues to drain.
  80          */
  81         msleep(2);
  82
  83         /*
  84          * Reset the switch.
  85          */
  86         REG_WRITE(REG_GLOBAL, 0x0a, 0xa130);
  87
  88         /*
  89          * Wait up to one second for reset to complete.
  90          */
  91         for (i = 0; i < 1000; i++) {
  92                 ret = REG_READ(REG_GLOBAL, 0x00);
  93                 if ((ret & 0x8000) == 0x0000)
  94                         break;
  95
  96                 msleep(1);
  97         }
  98         if (i == 1000)
  99                 return -ETIMEDOUT;
 100
 101         return 0;
 102 }
 103
 104 static int mv88e6060_setup_global(struct dsa_switch *ds)
 105 {
 106         /*
 107          * Disable discarding of frames with excessive collisions,
 108          * set the maximum frame size to 1536 bytes, and mask all
 109          * interrupt sources.
 110          */
 111         REG_WRITE(REG_GLOBAL, 0x04, 0x0800);
 112
 113         /*
 114          * Enable automatic address learning, set the address
 115          * database size to 1024 entries, and set the default aging
 116          * time to 5 minutes.
 117          */
 118         REG_WRITE(REG_GLOBAL, 0x0a, 0x2130);
 119
 120         return 0;
 121 }
 122
 123 static int mv88e6060_setup_port(struct dsa_switch *ds, int p)
 124 {
 125         int addr = REG_PORT(p);
 126
 127         /*
 128          * Do not force flow control, disable Ingress and Egress
 129          * Header tagging, disable VLAN tunneling, and set the port
 130          * state to Forwarding.  Additionally, if this is the CPU
 131          * port, enable Ingress and Egress Trailer tagging mode.
 132          */
 133         REG_WRITE(addr, 0x04, dsa_is_cpu_port(ds, p) ?  0x4103 : 0x0003);
 134
 135         /*
 136          * Port based VLAN map: give each port its own address
 137          * database, allow the CPU port to talk to each of the 'real'
 138          * ports, and allow each of the 'real' ports to only talk to
 139          * the CPU port.
 140          */
 141         REG_WRITE(addr, 0x06,
 142                         ((p & 0xf) << 12) |
 143                          (dsa_is_cpu_port(ds, p) ?
 144                                 ds->phys_port_mask :
 145                                 (1 << ds->dst->cpu_port)));
 146
 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         REG_WRITE(addr, 0x0b, 1 << p);
 154
 155         return 0;
 156 }
 157
 158 static int mv88e6060_setup(struct dsa_switch *ds)
 159 {
 160         int i;
 161         int ret;
 162
 163         ret = mv88e6060_switch_reset(ds);
 164         if (ret < 0)
 165                 return ret;
 166
 167         /* @@@ initialise atu */
 168
 169         ret = mv88e6060_setup_global(ds);
 170         if (ret < 0)
 171                 return ret;
 172
 173         for (i = 0; i < 6; i++) {
 174                 ret = mv88e6060_setup_port(ds, i);
 175                 if (ret < 0)
 176                         return ret;
 177         }
 178
 179         return 0;
 180 }
 181
 182 static int mv88e6060_set_addr(struct dsa_switch *ds, u8 *addr)
 183 {
 184         REG_WRITE(REG_GLOBAL, 0x01, (addr[0] << 8) | addr[1]);
 185         REG_WRITE(REG_GLOBAL, 0x02, (addr[2] << 8) | addr[3]);
 186         REG_WRITE(REG_GLOBAL, 0x03, (addr[4] << 8) | addr[5]);
 187
 188         return 0;
 189 }
 190
 191 static int mv88e6060_port_to_phy_addr(int port)
 192 {
 193         if (port >= 0 && port <= 5)
 194                 return port;
 195         return -1;
 196 }
 197
 198 static int mv88e6060_phy_read(struct dsa_switch *ds, int port, int regnum)
 199 {
 200         int addr;
 201
 202         addr = mv88e6060_port_to_phy_addr(port);
 203         if (addr == -1)
 204                 return 0xffff;
 205
 206         return reg_read(ds, addr, regnum);
 207 }
 208
 209 static int
 210 mv88e6060_phy_write(struct dsa_switch *ds, int port, int regnum, u16 val)
 211 {
 212         int addr;
 213
 214         addr = mv88e6060_port_to_phy_addr(port);
 215         if (addr == -1)
 216                 return 0xffff;
 217
 218         return reg_write(ds, addr, regnum, val);
 219 }
 220
 221 static void mv88e6060_poll_link(struct dsa_switch *ds)
 222 {
 223         int i;
 224
 225         for (i = 0; i < DSA_MAX_PORTS; i++) {
 226                 struct net_device *dev;
 227                 int uninitialized_var(port_status);
 228                 int link;
 229                 int speed;
 230                 int duplex;
 231                 int fc;
 232
 233                 dev = ds->ports[i];
 234                 if (dev == NULL)
 235                         continue;
 236
 237                 link = 0;
 238                 if (dev->flags & IFF_UP) {
 239                         port_status = reg_read(ds, REG_PORT(i), 0x00);
 240                         if (port_status < 0)
 241                                 continue;
 242
 243                         link = !!(port_status & 0x1000);
 244                 }
 245
 246                 if (!link) {
 247                         if (netif_carrier_ok(dev)) {
 248                                 printk(KERN_INFO "%s: link down\n", dev->name);
 249                                 netif_carrier_off(dev);
 250                         }
 251                         continue;
 252                 }
 253
 254                 speed = (port_status & 0x0100) ? 100 : 10;
 255                 duplex = (port_status & 0x0200) ? 1 : 0;
 256                 fc = ((port_status & 0xc000) == 0xc000) ? 1 : 0;
 257
 258                 if (!netif_carrier_ok(dev)) {
 259                         printk(KERN_INFO "%s: link up, %d Mb/s, %s duplex, "
 260                                          "flow control %sabled\n", dev->name,
 261                                          speed, duplex ? "full" : "half",
 262                                          fc ? "en" : "dis");
 263                         netif_carrier_on(dev);
 264                 }
 265         }
 266 }
 267
 268 static struct dsa_switch_driver mv88e6060_switch_driver = {
 269         .tag_protocol   = htons(ETH_P_TRAILER),
 270         .probe          = mv88e6060_probe,
 271         .setup          = mv88e6060_setup,
 272         .set_addr       = mv88e6060_set_addr,
 273         .phy_read       = mv88e6060_phy_read,
 274         .phy_write      = mv88e6060_phy_write,
 275         .poll_link      = mv88e6060_poll_link,
 276 };
 277
 278 static int __init mv88e6060_init(void)
 279 {
 280         register_switch_driver(&mv88e6060_switch_driver);
 281         return 0;
 282 }
 283 module_init(mv88e6060_init);
 284
 285 static void __exit mv88e6060_cleanup(void)
 286 {
 287         unregister_switch_driver(&mv88e6060_switch_driver);
 288 }
 289 module_exit(mv88e6060_cleanup);
 290
 291 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
 292 MODULE_DESCRIPTION("Driver for Marvell 88E6060 ethernet switch chip");
 293 MODULE_LICENSE("GPL");
 294 MODULE_ALIAS("platform:mv88e6060");