target/linux/ar71xx/files/drivers/net/dsa/mv88e6063.c

   1 /*
   2  * net/dsa/mv88e6063.c - Driver for Marvell 88e6063 switch chips
   3  * Copyright (c) 2009 Gabor Juhos <juhosg@openwrt.org>
   4  *
   5  * This driver was base on: net/dsa/mv88e6060.c
   6  *   net/dsa/mv88e6063.c - Driver for Marvell 88e6060 switch chips
   7  *   Copyright (c) 2008-2009 Marvell Semiconductor
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  */
  14
  15 #include <linux/version.h>
  16 #include <linux/list.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/phy.h>
  19 #include <net/dsa.h>
  20
  21 #define REG_BASE                0x10
  22 #define REG_PHY(p)              (REG_BASE + (p))
  23 #define REG_PORT(p)             (REG_BASE + 8 + (p))
  24 #define REG_GLOBAL              (REG_BASE + 0x0f)
  25 #define NUM_PORTS               7
  26
  27 static int reg_read(struct dsa_switch *ds, int addr, int reg)
  28 {
  29 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0)
  30         return mdiobus_read(ds->master_mii_bus, addr, reg);
  31 #else
  32         struct mii_bus *bus = dsa_host_dev_to_mii_bus(ds->master_dev);
  33         return mdiobus_read(bus, addr, reg);
  34 #endif
  35 }
  36
  37 #define REG_READ(addr, reg)                                     \
  38         ({                                                      \
  39                 int __ret;                                      \
  40                                                                 \
  41                 __ret = reg_read(ds, addr, reg);                \
  42                 if (__ret < 0)                                  \
  43                         return __ret;                           \
  44                 __ret;                                          \
  45         })
  46
  47
  48 static int reg_write(struct dsa_switch *ds, int addr, int reg, u16 val)
  49 {
  50 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0)
  51         return mdiobus_write(ds->master_mii_bus, addr, reg, val);
  52 #else
  53         struct mii_bus *bus = dsa_host_dev_to_mii_bus(ds->master_dev);
  54         return mdiobus_write(bus, addr, reg, val);
  55 #endif
  56 }
  57
  58 #define REG_WRITE(addr, reg, val)                               \
  59         ({                                                      \
  60                 int __ret;                                      \
  61                                                                 \
  62                 __ret = reg_write(ds, addr, reg, val);          \
  63                 if (__ret < 0)                                  \
  64                         return __ret;                           \
  65         })
  66
  67 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0)
  68 static char *mv88e6063_probe(struct mii_bus *bus, int sw_addr)
  69 #else
  70 static char *mv88e6063_probe(struct device *host_dev, int sw_addr)
  71 #endif
  72 {
  73         struct mii_bus *bus = dsa_host_dev_to_mii_bus(host_dev);
  74         int ret;
  75
  76         ret = mdiobus_read(bus, REG_PORT(0), 0x03);
  77         if (ret >= 0) {
  78                 ret &= 0xfff0;
  79                 if (ret == 0x1530)
  80                         return "Marvell 88E6063";
  81         }
  82
  83         return NULL;
  84 }
  85
  86 static int mv88e6063_switch_reset(struct dsa_switch *ds)
  87 {
  88         int i;
  89         int ret;
  90
  91         /*
  92          * Set all ports to the disabled state.
  93          */
  94         for (i = 0; i < NUM_PORTS; i++) {
  95                 ret = REG_READ(REG_PORT(i), 0x04);
  96                 REG_WRITE(REG_PORT(i), 0x04, ret & 0xfffc);
  97         }
  98
  99         /*
 100          * Wait for transmit queues to drain.
 101          */
 102         msleep(2);
 103
 104         /*
 105          * Reset the switch.
 106          */
 107         REG_WRITE(REG_GLOBAL, 0x0a, 0xa130);
 108
 109         /*
 110          * Wait up to one second for reset to complete.
 111          */
 112         for (i = 0; i < 1000; i++) {
 113                 ret = REG_READ(REG_GLOBAL, 0x00);
 114                 if ((ret & 0x8000) == 0x0000)
 115                         break;
 116
 117                 msleep(1);
 118         }
 119         if (i == 1000)
 120                 return -ETIMEDOUT;
 121
 122         return 0;
 123 }
 124
 125 static int mv88e6063_setup_global(struct dsa_switch *ds)
 126 {
 127         /*
 128          * Disable discarding of frames with excessive collisions,
 129          * set the maximum frame size to 1536 bytes, and mask all
 130          * interrupt sources.
 131          */
 132         REG_WRITE(REG_GLOBAL, 0x04, 0x0800);
 133
 134         /*
 135          * Enable automatic address learning, set the address
 136          * database size to 1024 entries, and set the default aging
 137          * time to 5 minutes.
 138          */
 139         REG_WRITE(REG_GLOBAL, 0x0a, 0x2130);
 140
 141         return 0;
 142 }
 143
 144 static int mv88e6063_setup_port(struct dsa_switch *ds, int p)
 145 {
 146         int addr = REG_PORT(p);
 147
 148         /*
 149          * Do not force flow control, disable Ingress and Egress
 150          * Header tagging, disable VLAN tunneling, and set the port
 151          * state to Forwarding.  Additionally, if this is the CPU
 152          * port, enable Ingress and Egress Trailer tagging mode.
 153          */
 154         REG_WRITE(addr, 0x04, dsa_is_cpu_port(ds, p) ?  0x4103 : 0x0003);
 155
 156         /*
 157          * Port based VLAN map: give each port its own address
 158          * database, allow the CPU port to talk to each of the 'real'
 159          * ports, and allow each of the 'real' ports to only talk to
 160          * the CPU port.
 161          */
 162         REG_WRITE(addr, 0x06,
 163                         ((p & 0xf) << 12) |
 164                          (dsa_is_cpu_port(ds, p) ?
 165                                 ds->phys_port_mask :
 166                                 (1 << ds->dst->cpu_port)));
 167
 168         /*
 169          * Port Association Vector: when learning source addresses
 170          * of packets, add the address to the address database using
 171          * a port bitmap that has only the bit for this port set and
 172          * the other bits clear.
 173          */
 174         REG_WRITE(addr, 0x0b, 1 << p);
 175
 176         return 0;
 177 }
 178
 179 static int mv88e6063_setup(struct dsa_switch *ds)
 180 {
 181         int i;
 182         int ret;
 183
 184         ret = mv88e6063_switch_reset(ds);
 185         if (ret < 0)
 186                 return ret;
 187
 188         /* @@@ initialise atu */
 189
 190         ret = mv88e6063_setup_global(ds);
 191         if (ret < 0)
 192                 return ret;
 193
 194         for (i = 0; i < NUM_PORTS; i++) {
 195                 ret = mv88e6063_setup_port(ds, i);
 196                 if (ret < 0)
 197                         return ret;
 198         }
 199
 200         return 0;
 201 }
 202
 203 static int mv88e6063_set_addr(struct dsa_switch *ds, u8 *addr)
 204 {
 205         REG_WRITE(REG_GLOBAL, 0x01, (addr[0] << 8) | addr[1]);
 206         REG_WRITE(REG_GLOBAL, 0x02, (addr[2] << 8) | addr[3]);
 207         REG_WRITE(REG_GLOBAL, 0x03, (addr[4] << 8) | addr[5]);
 208
 209         return 0;
 210 }
 211
 212 static int mv88e6063_port_to_phy_addr(int port)
 213 {
 214         if (port >= 0 && port <= NUM_PORTS)
 215                 return REG_PHY(port);
 216         return -1;
 217 }
 218
 219 static int mv88e6063_phy_read(struct dsa_switch *ds, int port, int regnum)
 220 {
 221         int addr;
 222
 223         addr = mv88e6063_port_to_phy_addr(port);
 224         if (addr == -1)
 225                 return 0xffff;
 226
 227         return reg_read(ds, addr, regnum);
 228 }
 229
 230 static int
 231 mv88e6063_phy_write(struct dsa_switch *ds, int port, int regnum, u16 val)
 232 {
 233         int addr;
 234
 235         addr = mv88e6063_port_to_phy_addr(port);
 236         if (addr == -1)
 237                 return 0xffff;
 238
 239         return reg_write(ds, addr, regnum, val);
 240 }
 241
 242 static void mv88e6063_poll_link(struct dsa_switch *ds)
 243 {
 244         int i;
 245
 246         for (i = 0; i < DSA_MAX_PORTS; i++) {
 247                 struct net_device *dev;
 248                 int uninitialized_var(port_status);
 249                 int link;
 250                 int speed;
 251                 int duplex;
 252                 int fc;
 253
 254                 dev = ds->ports[i];
 255                 if (dev == NULL)
 256                         continue;
 257
 258                 link = 0;
 259                 if (dev->flags & IFF_UP) {
 260                         port_status = reg_read(ds, REG_PORT(i), 0x00);
 261                         if (port_status < 0)
 262                                 continue;
 263
 264                         link = !!(port_status & 0x1000);
 265                 }
 266
 267                 if (!link) {
 268                         if (netif_carrier_ok(dev)) {
 269                                 printk(KERN_INFO "%s: link down\n", dev->name);
 270                                 netif_carrier_off(dev);
 271                         }
 272                         continue;
 273                 }
 274
 275                 speed = (port_status & 0x0100) ? 100 : 10;
 276                 duplex = (port_status & 0x0200) ? 1 : 0;
 277                 fc = ((port_status & 0xc000) == 0xc000) ? 1 : 0;
 278
 279                 if (!netif_carrier_ok(dev)) {
 280                         printk(KERN_INFO "%s: link up, %d Mb/s, %s duplex, "
 281                                          "flow control %sabled\n", dev->name,
 282                                          speed, duplex ? "full" : "half",
 283                                          fc ? "en" : "dis");
 284                         netif_carrier_on(dev);
 285                 }
 286         }
 287 }
 288
 289 static struct dsa_switch_driver mv88e6063_switch_driver = {
 290         .tag_protocol   = htons(ETH_P_TRAILER),
 291         .probe          = mv88e6063_probe,
 292         .setup          = mv88e6063_setup,
 293         .set_addr       = mv88e6063_set_addr,
 294         .phy_read       = mv88e6063_phy_read,
 295         .phy_write      = mv88e6063_phy_write,
 296         .poll_link      = mv88e6063_poll_link,
 297 };
 298
 299 static int __init mv88e6063_init(void)
 300 {
 301         register_switch_driver(&mv88e6063_switch_driver);
 302         return 0;
 303 }
 304 module_init(mv88e6063_init);
 305
 306 static void __exit mv88e6063_cleanup(void)
 307 {
 308         unregister_switch_driver(&mv88e6063_switch_driver);
 309 }
 310 module_exit(mv88e6063_cleanup);