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/jiffies.h>
  13 #include <linux/list.h>
  14 #include <linux/module.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/phy.h>
  17 #include <net/dsa.h>
  18
  19 #define REG_PORT(p)             (8 + (p))
  20 #define REG_GLOBAL              0x0f
  21
  22 static int reg_read(struct dsa_switch *ds, int addr, int reg)
  23 {
  24         return mdiobus_read(ds->master_mii_bus, ds->pd->sw_addr + addr, reg);
  25 }
  26
  27 #define REG_READ(addr, reg)                                     \
  28         ({                                                      \
  29                 int __ret;                                      \
  30                                                                 \
  31                 __ret = reg_read(ds, addr, reg);                \
  32                 if (__ret < 0)                                  \
  33                         return __ret;                           \
  34                 __ret;                                          \
  35         })
  36
  37
  38 static int reg_write(struct dsa_switch *ds, int addr, int reg, u16 val)
  39 {
  40         return mdiobus_write(ds->master_mii_bus, ds->pd->sw_addr + addr,
  41                              reg, val);
  42 }
  43
  44 #define REG_WRITE(addr, reg, val)                               \
  45         ({                                                      \
  46                 int __ret;                                      \
  47                                                                 \
  48                 __ret = reg_write(ds, addr, reg, val);          \
  49                 if (__ret < 0)                                  \
  50                         return __ret;                           \
  51         })
  52
  53 static char *mv88e6060_probe(struct mii_bus *bus, int sw_addr)
  54 {
  55         int ret;
  56
  57         ret = mdiobus_read(bus, sw_addr + REG_PORT(0), 0x03);
  58         if (ret >= 0) {
  59                 ret &= 0xfff0;
  60                 if (ret == 0x0600)
  61                         return "Marvell 88E6060";
  62         }
  63
  64         return NULL;
  65 }
  66
  67 static int mv88e6060_switch_reset(struct dsa_switch *ds)
  68 {
  69         int i;
  70         int ret;
  71         unsigned long timeout;
  72
  73         /* Set all ports to the disabled state. */
  74         for (i = 0; i < 6; i++) {
  75                 ret = REG_READ(REG_PORT(i), 0x04);
  76                 REG_WRITE(REG_PORT(i), 0x04, ret & 0xfffc);
  77         }
  78
  79         /* Wait for transmit queues to drain. */
  80         usleep_range(2000, 4000);
  81
  82         /* Reset the switch. */
  83         REG_WRITE(REG_GLOBAL, 0x0a, 0xa130);
  84
  85         /* Wait up to one second for reset to complete. */
  86         timeout = jiffies + 1 * HZ;
  87         while (time_before(jiffies, timeout)) {
  88                 ret = REG_READ(REG_GLOBAL, 0x00);
  89                 if ((ret & 0x8000) == 0x0000)
  90                         break;
  91
  92                 usleep_range(1000, 2000);
  93         }
  94         if (time_after(jiffies, timeout))
  95                 return -ETIMEDOUT;
  96
  97         return 0;
  98 }
  99
 100 static int mv88e6060_setup_global(struct dsa_switch *ds)
 101 {
 102         /* Disable discarding of frames with excessive collisions,
 103          * set the maximum frame size to 1536 bytes, and mask all
 104          * interrupt sources.
 105          */
 106         REG_WRITE(REG_GLOBAL, 0x04, 0x0800);
 107
 108         /* Enable automatic address learning, set the address
 109          * database size to 1024 entries, and set the default aging
 110          * time to 5 minutes.
 111          */
 112         REG_WRITE(REG_GLOBAL, 0x0a, 0x2130);
 113
 114         return 0;
 115 }
 116
 117 static int mv88e6060_setup_port(struct dsa_switch *ds, int p)
 118 {
 119         int addr = REG_PORT(p);
 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         REG_WRITE(addr, 0x04, dsa_is_cpu_port(ds, p) ?  0x4103 : 0x0003);
 127
 128         /* Port based VLAN map: give each port its own address
 129          * database, allow the CPU port to talk to each of the 'real'
 130          * ports, and allow each of the 'real' ports to only talk to
 131          * the CPU port.
 132          */
 133         REG_WRITE(addr, 0x06,
 134                         ((p & 0xf) << 12) |
 135                          (dsa_is_cpu_port(ds, p) ?
 136                                 ds->phys_port_mask :
 137                                 (1 << ds->dst->cpu_port)));
 138
 139         /* Port Association Vector: when learning source addresses
 140          * of packets, add the address to the address database using
 141          * a port bitmap that has only the bit for this port set and
 142          * the other bits clear.
 143          */
 144         REG_WRITE(addr, 0x0b, 1 << p);
 145
 146         return 0;
 147 }
 148
 149 static int mv88e6060_setup(struct dsa_switch *ds)
 150 {
 151         int i;
 152         int ret;
 153
 154         ret = mv88e6060_switch_reset(ds);
 155         if (ret < 0)
 156                 return ret;
 157
 158         /* @@@ initialise atu */
 159
 160         ret = mv88e6060_setup_global(ds);
 161         if (ret < 0)
 162                 return ret;
 163
 164         for (i = 0; i < 6; i++) {
 165                 ret = mv88e6060_setup_port(ds, i);
 166                 if (ret < 0)
 167                         return ret;
 168         }
 169
 170         return 0;
 171 }
 172
 173 static int mv88e6060_set_addr(struct dsa_switch *ds, u8 *addr)
 174 {
 175         REG_WRITE(REG_GLOBAL, 0x01, (addr[0] << 8) | addr[1]);
 176         REG_WRITE(REG_GLOBAL, 0x02, (addr[2] << 8) | addr[3]);
 177         REG_WRITE(REG_GLOBAL, 0x03, (addr[4] << 8) | addr[5]);
 178
 179         return 0;
 180 }
 181
 182 static int mv88e6060_port_to_phy_addr(int port)
 183 {
 184         if (port >= 0 && port <= 5)
 185                 return port;
 186         return -1;
 187 }
 188
 189 static int mv88e6060_phy_read(struct dsa_switch *ds, int port, int regnum)
 190 {
 191         int addr;
 192
 193         addr = mv88e6060_port_to_phy_addr(port);
 194         if (addr == -1)
 195                 return 0xffff;
 196
 197         return reg_read(ds, addr, regnum);
 198 }
 199
 200 static int
 201 mv88e6060_phy_write(struct dsa_switch *ds, int port, int regnum, u16 val)
 202 {
 203         int addr;
 204
 205         addr = mv88e6060_port_to_phy_addr(port);
 206         if (addr == -1)
 207                 return 0xffff;
 208
 209         return reg_write(ds, addr, regnum, val);
 210 }
 211
 212 static void mv88e6060_poll_link(struct dsa_switch *ds)
 213 {
 214         int i;
 215
 216         for (i = 0; i < DSA_MAX_PORTS; i++) {
 217                 struct net_device *dev;
 218                 int uninitialized_var(port_status);
 219                 int link;
 220                 int speed;
 221                 int duplex;
 222                 int fc;
 223
 224                 dev = ds->ports[i];
 225                 if (dev == NULL)
 226                         continue;
 227
 228                 link = 0;
 229                 if (dev->flags & IFF_UP) {
 230                         port_status = reg_read(ds, REG_PORT(i), 0x00);
 231                         if (port_status < 0)
 232                                 continue;
 233
 234                         link = !!(port_status & 0x1000);
 235                 }
 236
 237                 if (!link) {
 238                         if (netif_carrier_ok(dev)) {
 239                                 netdev_info(dev, "link down\n");
 240                                 netif_carrier_off(dev);
 241                         }
 242                         continue;
 243                 }
 244
 245                 speed = (port_status & 0x0100) ? 100 : 10;
 246                 duplex = (port_status & 0x0200) ? 1 : 0;
 247                 fc = ((port_status & 0xc000) == 0xc000) ? 1 : 0;
 248
 249                 if (!netif_carrier_ok(dev)) {
 250                         netdev_info(dev,
 251                                     "link up, %d Mb/s, %s duplex, flow control %sabled\n",
 252                                     speed,
 253                                     duplex ? "full" : "half",
 254                                     fc ? "en" : "dis");
 255                         netif_carrier_on(dev);
 256                 }
 257         }
 258 }
 259
 260 static struct dsa_switch_driver mv88e6060_switch_driver = {
 261         .tag_protocol   = htons(ETH_P_TRAILER),
 262         .probe          = mv88e6060_probe,
 263         .setup          = mv88e6060_setup,
 264         .set_addr       = mv88e6060_set_addr,
 265         .phy_read       = mv88e6060_phy_read,
 266         .phy_write      = mv88e6060_phy_write,
 267         .poll_link      = mv88e6060_poll_link,
 268 };
 269
 270 static int __init mv88e6060_init(void)
 271 {
 272         register_switch_driver(&mv88e6060_switch_driver);
 273         return 0;
 274 }
 275 module_init(mv88e6060_init);
 276
 277 static void __exit mv88e6060_cleanup(void)
 278 {
 279         unregister_switch_driver(&mv88e6060_switch_driver);
 280 }
 281 module_exit(mv88e6060_cleanup);
 282
 283 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
 284 MODULE_DESCRIPTION("Driver for Marvell 88E6060 ethernet switch chip");
 285 MODULE_LICENSE("GPL");
 286 MODULE_ALIAS("platform:mv88e6060");