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 {
  70 #else
  71 static char *mv88e6063_probe(struct device *host_dev, int sw_addr)
  72 {
  73         struct mii_bus *bus = dsa_host_dev_to_mii_bus(host_dev);
  74 #endif
  75         int ret;
  76
  77         ret = mdiobus_read(bus, REG_PORT(0), 0x03);
  78         if (ret >= 0) {
  79                 ret &= 0xfff0;
  80                 if (ret == 0x1530)
  81                         return "Marvell 88E6063";
  82         }
  83
  84         return NULL;
  85 }
  86
  87 static int mv88e6063_switch_reset(struct dsa_switch *ds)
  88 {
  89         int i;
  90         int ret;
  91
  92         /*
  93          * Set all ports to the disabled state.
  94          */
  95         for (i = 0; i < NUM_PORTS; i++) {
  96                 ret = REG_READ(REG_PORT(i), 0x04);
  97                 REG_WRITE(REG_PORT(i), 0x04, ret & 0xfffc);
  98         }
  99
 100         /*
 101          * Wait for transmit queues to drain.
 102          */
 103         msleep(2);
 104
 105         /*
 106          * Reset the switch.
 107          */
 108         REG_WRITE(REG_GLOBAL, 0x0a, 0xa130);
 109
 110         /*
 111          * Wait up to one second for reset to complete.
 112          */
 113         for (i = 0; i < 1000; i++) {
 114                 ret = REG_READ(REG_GLOBAL, 0x00);
 115                 if ((ret & 0x8000) == 0x0000)
 116                         break;
 117
 118                 msleep(1);
 119         }
 120         if (i == 1000)
 121                 return -ETIMEDOUT;
 122
 123         return 0;
 124 }
 125
 126 static int mv88e6063_setup_global(struct dsa_switch *ds)
 127 {
 128         /*
 129          * Disable discarding of frames with excessive collisions,
 130          * set the maximum frame size to 1536 bytes, and mask all
 131          * interrupt sources.
 132          */
 133         REG_WRITE(REG_GLOBAL, 0x04, 0x0800);
 134
 135         /*
 136          * Enable automatic address learning, set the address
 137          * database size to 1024 entries, and set the default aging
 138          * time to 5 minutes.
 139          */
 140         REG_WRITE(REG_GLOBAL, 0x0a, 0x2130);
 141
 142         return 0;
 143 }
 144
 145 static int mv88e6063_setup_port(struct dsa_switch *ds, int p)
 146 {
 147         int addr = REG_PORT(p);
 148
 149         /*
 150          * Do not force flow control, disable Ingress and Egress
 151          * Header tagging, disable VLAN tunneling, and set the port
 152          * state to Forwarding.  Additionally, if this is the CPU
 153          * port, enable Ingress and Egress Trailer tagging mode.
 154          */
 155         REG_WRITE(addr, 0x04, dsa_is_cpu_port(ds, p) ?  0x4103 : 0x0003);
 156
 157         /*
 158          * Port based VLAN map: give each port its own address
 159          * database, allow the CPU port to talk to each of the 'real'
 160          * ports, and allow each of the 'real' ports to only talk to
 161          * the CPU port.
 162          */
 163         REG_WRITE(addr, 0x06,
 164                         ((p & 0xf) << 12) |
 165                          (dsa_is_cpu_port(ds, p) ?
 166                                 ds->phys_port_mask :
 167                                 (1 << ds->dst->cpu_port)));
 168
 169         /*
 170          * Port Association Vector: when learning source addresses
 171          * of packets, add the address to the address database using
 172          * a port bitmap that has only the bit for this port set and
 173          * the other bits clear.
 174          */
 175         REG_WRITE(addr, 0x0b, 1 << p);
 176
 177         return 0;
 178 }
 179
 180 static int mv88e6063_setup(struct dsa_switch *ds)
 181 {
 182         int i;
 183         int ret;
 184
 185         ret = mv88e6063_switch_reset(ds);
 186         if (ret < 0)
 187                 return ret;
 188
 189         /* @@@ initialise atu */
 190
 191         ret = mv88e6063_setup_global(ds);
 192         if (ret < 0)
 193                 return ret;
 194
 195         for (i = 0; i < NUM_PORTS; i++) {
 196                 ret = mv88e6063_setup_port(ds, i);
 197                 if (ret < 0)
 198                         return ret;
 199         }
 200
 201         return 0;
 202 }
 203
 204 static int mv88e6063_set_addr(struct dsa_switch *ds, u8 *addr)
 205 {
 206         REG_WRITE(REG_GLOBAL, 0x01, (addr[0] << 8) | addr[1]);
 207         REG_WRITE(REG_GLOBAL, 0x02, (addr[2] << 8) | addr[3]);
 208         REG_WRITE(REG_GLOBAL, 0x03, (addr[4] << 8) | addr[5]);
 209
 210         return 0;
 211 }
 212
 213 static int mv88e6063_port_to_phy_addr(int port)
 214 {
 215         if (port >= 0 && port <= NUM_PORTS)
 216                 return REG_PHY(port);
 217         return -1;
 218 }
 219
 220 static int mv88e6063_phy_read(struct dsa_switch *ds, int port, int regnum)
 221 {
 222         int addr;
 223
 224         addr = mv88e6063_port_to_phy_addr(port);
 225         if (addr == -1)
 226                 return 0xffff;
 227
 228         return reg_read(ds, addr, regnum);
 229 }
 230
 231 static int
 232 mv88e6063_phy_write(struct dsa_switch *ds, int port, int regnum, u16 val)
 233 {
 234         int addr;
 235
 236         addr = mv88e6063_port_to_phy_addr(port);
 237         if (addr == -1)
 238                 return 0xffff;
 239
 240         return reg_write(ds, addr, regnum, val);
 241 }
 242
 243 static void mv88e6063_poll_link(struct dsa_switch *ds)
 244 {
 245         int i;
 246
 247         for (i = 0; i < DSA_MAX_PORTS; i++) {
 248                 struct net_device *dev;
 249                 int uninitialized_var(port_status);
 250                 int link;
 251                 int speed;
 252                 int duplex;
 253                 int fc;
 254
 255                 dev = ds->ports[i];
 256                 if (dev == NULL)
 257                         continue;
 258
 259                 link = 0;
 260                 if (dev->flags & IFF_UP) {
 261                         port_status = reg_read(ds, REG_PORT(i), 0x00);
 262                         if (port_status < 0)
 263                                 continue;
 264
 265                         link = !!(port_status & 0x1000);
 266                 }
 267
 268                 if (!link) {
 269                         if (netif_carrier_ok(dev)) {
 270                                 printk(KERN_INFO "%s: link down\n", dev->name);
 271                                 netif_carrier_off(dev);
 272                         }
 273                         continue;
 274                 }
 275
 276                 speed = (port_status & 0x0100) ? 100 : 10;
 277                 duplex = (port_status & 0x0200) ? 1 : 0;
 278                 fc = ((port_status & 0xc000) == 0xc000) ? 1 : 0;
 279
 280                 if (!netif_carrier_ok(dev)) {
 281                         printk(KERN_INFO "%s: link up, %d Mb/s, %s duplex, "
 282                                          "flow control %sabled\n", dev->name,
 283                                          speed, duplex ? "full" : "half",
 284                                          fc ? "en" : "dis");
 285                         netif_carrier_on(dev);
 286                 }
 287         }
 288 }
 289
 290 static struct dsa_switch_driver mv88e6063_switch_driver = {
 291         .tag_protocol   = htons(ETH_P_TRAILER),
 292         .probe          = mv88e6063_probe,
 293         .setup          = mv88e6063_setup,
 294         .set_addr       = mv88e6063_set_addr,
 295         .phy_read       = mv88e6063_phy_read,
 296         .phy_write      = mv88e6063_phy_write,
 297         .poll_link      = mv88e6063_poll_link,
 298 };
 299
 300 static int __init mv88e6063_init(void)
 301 {
 302         register_switch_driver(&mv88e6063_switch_driver);
 303         return 0;
 304 }
 305 module_init(mv88e6063_init);
 306
 307 static void __exit mv88e6063_cleanup(void)
 308 {
 309         unregister_switch_driver(&mv88e6063_switch_driver);
 310 }
 311 module_exit(mv88e6063_cleanup);