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 #include "mv88e6060.h"
  19
  20 static int reg_read(struct dsa_switch *ds, int addr, int reg)
  21 {
  22         struct mv88e6060_priv *priv = ds->priv;
  23
  24         return mdiobus_read_nested(priv->bus, priv->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         struct mv88e6060_priv *priv = ds->priv;
  41
  42         return mdiobus_write_nested(priv->bus, priv->sw_addr + addr, reg, val);
  43 }
  44
  45 #define REG_WRITE(addr, reg, val)                               \
  46         ({                                                      \
  47                 int __ret;                                      \
  48                                                                 \
  49                 __ret = reg_write(ds, addr, reg, val);          \
  50                 if (__ret < 0)                                  \
  51                         return __ret;                           \
  52         })
  53
  54 static const char *mv88e6060_get_name(struct mii_bus *bus, int sw_addr)
  55 {
  56         int ret;
  57
  58         ret = mdiobus_read(bus, sw_addr + REG_PORT(0), PORT_SWITCH_ID);
  59         if (ret >= 0) {
  60                 if (ret == PORT_SWITCH_ID_6060)
  61                         return "Marvell 88E6060 (A0)";
  62                 if (ret == PORT_SWITCH_ID_6060_R1 ||
  63                     ret == PORT_SWITCH_ID_6060_R2)
  64                         return "Marvell 88E6060 (B0)";
  65                 if ((ret & PORT_SWITCH_ID_6060_MASK) == PORT_SWITCH_ID_6060)
  66                         return "Marvell 88E6060";
  67         }
  68
  69         return NULL;
  70 }
  71
  72 static enum dsa_tag_protocol mv88e6060_get_tag_protocol(struct dsa_switch *ds)
  73 {
  74         return DSA_TAG_PROTO_TRAILER;
  75 }
  76
  77 static const char *mv88e6060_drv_probe(struct device *dsa_dev,
  78                                        struct device *host_dev, int sw_addr,
  79                                        void **_priv)
  80 {
  81         struct mii_bus *bus = dsa_host_dev_to_mii_bus(host_dev);
  82         struct mv88e6060_priv *priv;
  83         const char *name;
  84
  85         name = mv88e6060_get_name(bus, sw_addr);
  86         if (name) {
  87                 priv = devm_kzalloc(dsa_dev, sizeof(*priv), GFP_KERNEL);
  88                 if (!priv)
  89                         return NULL;
  90                 *_priv = priv;
  91                 priv->bus = bus;
  92                 priv->sw_addr = sw_addr;
  93         }
  94
  95         return name;
  96 }
  97
  98 static int mv88e6060_switch_reset(struct dsa_switch *ds)
  99 {
 100         int i;
 101         int ret;
 102         unsigned long timeout;
 103
 104         /* Set all ports to the disabled state. */
 105         for (i = 0; i < MV88E6060_PORTS; i++) {
 106                 ret = REG_READ(REG_PORT(i), PORT_CONTROL);
 107                 REG_WRITE(REG_PORT(i), PORT_CONTROL,
 108                           ret & ~PORT_CONTROL_STATE_MASK);
 109         }
 110
 111         /* Wait for transmit queues to drain. */
 112         usleep_range(2000, 4000);
 113
 114         /* Reset the switch. */
 115         REG_WRITE(REG_GLOBAL, GLOBAL_ATU_CONTROL,
 116                   GLOBAL_ATU_CONTROL_SWRESET |
 117                   GLOBAL_ATU_CONTROL_ATUSIZE_1024 |
 118                   GLOBAL_ATU_CONTROL_ATE_AGE_5MIN);
 119
 120         /* Wait up to one second for reset to complete. */
 121         timeout = jiffies + 1 * HZ;
 122         while (time_before(jiffies, timeout)) {
 123                 ret = REG_READ(REG_GLOBAL, GLOBAL_STATUS);
 124                 if (ret & GLOBAL_STATUS_INIT_READY)
 125                         break;
 126
 127                 usleep_range(1000, 2000);
 128         }
 129         if (time_after(jiffies, timeout))
 130                 return -ETIMEDOUT;
 131
 132         return 0;
 133 }
 134
 135 static int mv88e6060_setup_global(struct dsa_switch *ds)
 136 {
 137         /* Disable discarding of frames with excessive collisions,
 138          * set the maximum frame size to 1536 bytes, and mask all
 139          * interrupt sources.
 140          */
 141         REG_WRITE(REG_GLOBAL, GLOBAL_CONTROL, GLOBAL_CONTROL_MAX_FRAME_1536);
 142
 143         /* Enable automatic address learning, set the address
 144          * database size to 1024 entries, and set the default aging
 145          * time to 5 minutes.
 146          */
 147         REG_WRITE(REG_GLOBAL, GLOBAL_ATU_CONTROL,
 148                   GLOBAL_ATU_CONTROL_ATUSIZE_1024 |
 149                   GLOBAL_ATU_CONTROL_ATE_AGE_5MIN);
 150
 151         return 0;
 152 }
 153
 154 static int mv88e6060_setup_port(struct dsa_switch *ds, int p)
 155 {
 156         int addr = REG_PORT(p);
 157
 158         /* Do not force flow control, disable Ingress and Egress
 159          * Header tagging, disable VLAN tunneling, and set the port
 160          * state to Forwarding.  Additionally, if this is the CPU
 161          * port, enable Ingress and Egress Trailer tagging mode.
 162          */
 163         REG_WRITE(addr, PORT_CONTROL,
 164                   dsa_is_cpu_port(ds, p) ?
 165                         PORT_CONTROL_TRAILER |
 166                         PORT_CONTROL_INGRESS_MODE |
 167                         PORT_CONTROL_STATE_FORWARDING :
 168                         PORT_CONTROL_STATE_FORWARDING);
 169
 170         /* Port based VLAN map: give each port its own address
 171          * database, allow the CPU port to talk to each of the 'real'
 172          * ports, and allow each of the 'real' ports to only talk to
 173          * the CPU port.
 174          */
 175         REG_WRITE(addr, PORT_VLAN_MAP,
 176                   ((p & 0xf) << PORT_VLAN_MAP_DBNUM_SHIFT) |
 177                    (dsa_is_cpu_port(ds, p) ?
 178                         ds->enabled_port_mask :
 179                         BIT(ds->dst->cpu_port)));
 180
 181         /* Port Association Vector: when learning source addresses
 182          * of packets, add the address to the address database using
 183          * a port bitmap that has only the bit for this port set and
 184          * the other bits clear.
 185          */
 186         REG_WRITE(addr, PORT_ASSOC_VECTOR, BIT(p));
 187
 188         return 0;
 189 }
 190
 191 static int mv88e6060_setup(struct dsa_switch *ds)
 192 {
 193         int ret;
 194         int i;
 195
 196         ret = mv88e6060_switch_reset(ds);
 197         if (ret < 0)
 198                 return ret;
 199
 200         /* @@@ initialise atu */
 201
 202         ret = mv88e6060_setup_global(ds);
 203         if (ret < 0)
 204                 return ret;
 205
 206         for (i = 0; i < MV88E6060_PORTS; i++) {
 207                 ret = mv88e6060_setup_port(ds, i);
 208                 if (ret < 0)
 209                         return ret;
 210         }
 211
 212         return 0;
 213 }
 214
 215 static int mv88e6060_set_addr(struct dsa_switch *ds, u8 *addr)
 216 {
 217         /* Use the same MAC Address as FD Pause frames for all ports */
 218         REG_WRITE(REG_GLOBAL, GLOBAL_MAC_01, (addr[0] << 9) | addr[1]);
 219         REG_WRITE(REG_GLOBAL, GLOBAL_MAC_23, (addr[2] << 8) | addr[3]);
 220         REG_WRITE(REG_GLOBAL, GLOBAL_MAC_45, (addr[4] << 8) | addr[5]);
 221
 222         return 0;
 223 }
 224
 225 static int mv88e6060_port_to_phy_addr(int port)
 226 {
 227         if (port >= 0 && port < MV88E6060_PORTS)
 228                 return port;
 229         return -1;
 230 }
 231
 232 static int mv88e6060_phy_read(struct dsa_switch *ds, int port, int regnum)
 233 {
 234         int addr;
 235
 236         addr = mv88e6060_port_to_phy_addr(port);
 237         if (addr == -1)
 238                 return 0xffff;
 239
 240         return reg_read(ds, addr, regnum);
 241 }
 242
 243 static int
 244 mv88e6060_phy_write(struct dsa_switch *ds, int port, int regnum, u16 val)
 245 {
 246         int addr;
 247
 248         addr = mv88e6060_port_to_phy_addr(port);
 249         if (addr == -1)
 250                 return 0xffff;
 251
 252         return reg_write(ds, addr, regnum, val);
 253 }
 254
 255 static struct dsa_switch_ops mv88e6060_switch_ops = {
 256         .get_tag_protocol = mv88e6060_get_tag_protocol,
 257         .probe          = mv88e6060_drv_probe,
 258         .setup          = mv88e6060_setup,
 259         .set_addr       = mv88e6060_set_addr,
 260         .phy_read       = mv88e6060_phy_read,
 261         .phy_write      = mv88e6060_phy_write,
 262 };
 263
 264 static int __init mv88e6060_init(void)
 265 {
 266         register_switch_driver(&mv88e6060_switch_ops);
 267         return 0;
 268 }
 269 module_init(mv88e6060_init);
 270
 271 static void __exit mv88e6060_cleanup(void)
 272 {
 273         unregister_switch_driver(&mv88e6060_switch_ops);
 274 }
 275 module_exit(mv88e6060_cleanup);
 276
 277 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
 278 MODULE_DESCRIPTION("Driver for Marvell 88E6060 ethernet switch chip");
 279 MODULE_LICENSE("GPL");
 280 MODULE_ALIAS("platform:mv88e6060");