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_to_priv(ds);
  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_to_priv(ds);
  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 const char *mv88e6060_drv_probe(struct device *dsa_dev,
  73                                        struct device *host_dev, int sw_addr,
  74                                        void **_priv)
  75 {
  76         struct mii_bus *bus = dsa_host_dev_to_mii_bus(host_dev);
  77         struct mv88e6060_priv *priv;
  78         const char *name;
  79
  80         name = mv88e6060_get_name(bus, sw_addr);
  81         if (name) {
  82                 priv = devm_kzalloc(dsa_dev, sizeof(*priv), GFP_KERNEL);
  83                 if (!priv)
  84                         return NULL;
  85                 *_priv = priv;
  86                 priv->bus = bus;
  87                 priv->sw_addr = sw_addr;
  88         }
  89
  90         return name;
  91 }
  92
  93 static int mv88e6060_switch_reset(struct dsa_switch *ds)
  94 {
  95         int i;
  96         int ret;
  97         unsigned long timeout;
  98
  99         /* Set all ports to the disabled state. */
 100         for (i = 0; i < MV88E6060_PORTS; i++) {
 101                 ret = REG_READ(REG_PORT(i), PORT_CONTROL);
 102                 REG_WRITE(REG_PORT(i), PORT_CONTROL,
 103                           ret & ~PORT_CONTROL_STATE_MASK);
 104         }
 105
 106         /* Wait for transmit queues to drain. */
 107         usleep_range(2000, 4000);
 108
 109         /* Reset the switch. */
 110         REG_WRITE(REG_GLOBAL, GLOBAL_ATU_CONTROL,
 111                   GLOBAL_ATU_CONTROL_SWRESET |
 112                   GLOBAL_ATU_CONTROL_ATUSIZE_1024 |
 113                   GLOBAL_ATU_CONTROL_ATE_AGE_5MIN);
 114
 115         /* Wait up to one second for reset to complete. */
 116         timeout = jiffies + 1 * HZ;
 117         while (time_before(jiffies, timeout)) {
 118                 ret = REG_READ(REG_GLOBAL, GLOBAL_STATUS);
 119                 if (ret & GLOBAL_STATUS_INIT_READY)
 120                         break;
 121
 122                 usleep_range(1000, 2000);
 123         }
 124         if (time_after(jiffies, timeout))
 125                 return -ETIMEDOUT;
 126
 127         return 0;
 128 }
 129
 130 static int mv88e6060_setup_global(struct dsa_switch *ds)
 131 {
 132         /* Disable discarding of frames with excessive collisions,
 133          * set the maximum frame size to 1536 bytes, and mask all
 134          * interrupt sources.
 135          */
 136         REG_WRITE(REG_GLOBAL, GLOBAL_CONTROL, GLOBAL_CONTROL_MAX_FRAME_1536);
 137
 138         /* Enable automatic address learning, set the address
 139          * database size to 1024 entries, and set the default aging
 140          * time to 5 minutes.
 141          */
 142         REG_WRITE(REG_GLOBAL, GLOBAL_ATU_CONTROL,
 143                   GLOBAL_ATU_CONTROL_ATUSIZE_1024 |
 144                   GLOBAL_ATU_CONTROL_ATE_AGE_5MIN);
 145
 146         return 0;
 147 }
 148
 149 static int mv88e6060_setup_port(struct dsa_switch *ds, int p)
 150 {
 151         int addr = REG_PORT(p);
 152
 153         /* Do not force flow control, disable Ingress and Egress
 154          * Header tagging, disable VLAN tunneling, and set the port
 155          * state to Forwarding.  Additionally, if this is the CPU
 156          * port, enable Ingress and Egress Trailer tagging mode.
 157          */
 158         REG_WRITE(addr, PORT_CONTROL,
 159                   dsa_is_cpu_port(ds, p) ?
 160                         PORT_CONTROL_TRAILER |
 161                         PORT_CONTROL_INGRESS_MODE |
 162                         PORT_CONTROL_STATE_FORWARDING :
 163                         PORT_CONTROL_STATE_FORWARDING);
 164
 165         /* Port based VLAN map: give each port its own address
 166          * database, allow the CPU port to talk to each of the 'real'
 167          * ports, and allow each of the 'real' ports to only talk to
 168          * the CPU port.
 169          */
 170         REG_WRITE(addr, PORT_VLAN_MAP,
 171                   ((p & 0xf) << PORT_VLAN_MAP_DBNUM_SHIFT) |
 172                    (dsa_is_cpu_port(ds, p) ?
 173                         ds->enabled_port_mask :
 174                         BIT(ds->dst->cpu_port)));
 175
 176         /* Port Association Vector: when learning source addresses
 177          * of packets, add the address to the address database using
 178          * a port bitmap that has only the bit for this port set and
 179          * the other bits clear.
 180          */
 181         REG_WRITE(addr, PORT_ASSOC_VECTOR, BIT(p));
 182
 183         return 0;
 184 }
 185
 186 static int mv88e6060_setup(struct dsa_switch *ds)
 187 {
 188         int ret;
 189         int i;
 190
 191         ret = mv88e6060_switch_reset(ds);
 192         if (ret < 0)
 193                 return ret;
 194
 195         /* @@@ initialise atu */
 196
 197         ret = mv88e6060_setup_global(ds);
 198         if (ret < 0)
 199                 return ret;
 200
 201         for (i = 0; i < MV88E6060_PORTS; i++) {
 202                 ret = mv88e6060_setup_port(ds, i);
 203                 if (ret < 0)
 204                         return ret;
 205         }
 206
 207         return 0;
 208 }
 209
 210 static int mv88e6060_set_addr(struct dsa_switch *ds, u8 *addr)
 211 {
 212         /* Use the same MAC Address as FD Pause frames for all ports */
 213         REG_WRITE(REG_GLOBAL, GLOBAL_MAC_01, (addr[0] << 9) | addr[1]);
 214         REG_WRITE(REG_GLOBAL, GLOBAL_MAC_23, (addr[2] << 8) | addr[3]);
 215         REG_WRITE(REG_GLOBAL, GLOBAL_MAC_45, (addr[4] << 8) | addr[5]);
 216
 217         return 0;
 218 }
 219
 220 static int mv88e6060_port_to_phy_addr(int port)
 221 {
 222         if (port >= 0 && port < MV88E6060_PORTS)
 223                 return port;
 224         return -1;
 225 }
 226
 227 static int mv88e6060_phy_read(struct dsa_switch *ds, int port, int regnum)
 228 {
 229         int addr;
 230
 231         addr = mv88e6060_port_to_phy_addr(port);
 232         if (addr == -1)
 233                 return 0xffff;
 234
 235         return reg_read(ds, addr, regnum);
 236 }
 237
 238 static int
 239 mv88e6060_phy_write(struct dsa_switch *ds, int port, int regnum, u16 val)
 240 {
 241         int addr;
 242
 243         addr = mv88e6060_port_to_phy_addr(port);
 244         if (addr == -1)
 245                 return 0xffff;
 246
 247         return reg_write(ds, addr, regnum, val);
 248 }
 249
 250 static struct dsa_switch_driver mv88e6060_switch_driver = {
 251         .tag_protocol   = DSA_TAG_PROTO_TRAILER,
 252         .probe          = mv88e6060_drv_probe,
 253         .setup          = mv88e6060_setup,
 254         .set_addr       = mv88e6060_set_addr,
 255         .phy_read       = mv88e6060_phy_read,
 256         .phy_write      = mv88e6060_phy_write,
 257 };
 258
 259 static int __init mv88e6060_init(void)
 260 {
 261         register_switch_driver(&mv88e6060_switch_driver);
 262         return 0;
 263 }
 264 module_init(mv88e6060_init);
 265
 266 static void __exit mv88e6060_cleanup(void)
 267 {
 268         unregister_switch_driver(&mv88e6060_switch_driver);
 269 }
 270 module_exit(mv88e6060_cleanup);
 271
 272 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
 273 MODULE_DESCRIPTION("Driver for Marvell 88E6060 ethernet switch chip");
 274 MODULE_LICENSE("GPL");
 275 MODULE_ALIAS("platform:mv88e6060");