include/net/dsa.h

   1 /*
   2  * include/net/dsa.h - Driver for Distributed Switch Architecture 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 #ifndef __LINUX_NET_DSA_H
  12 #define __LINUX_NET_DSA_H
  13
  14 #include <linux/if_ether.h>
  15 #include <linux/list.h>
  16 #include <linux/timer.h>
  17 #include <linux/workqueue.h>
  18 #include <linux/of.h>
  19 #include <linux/of_gpio.h>
  20 #include <linux/phy.h>
  21 #include <linux/phy_fixed.h>
  22 #include <linux/ethtool.h>
  23
  24 enum dsa_tag_protocol {
  25         DSA_TAG_PROTO_NONE = 0,
  26         DSA_TAG_PROTO_DSA,
  27         DSA_TAG_PROTO_TRAILER,
  28         DSA_TAG_PROTO_EDSA,
  29         DSA_TAG_PROTO_BRCM,
  30 };
  31
  32 #define DSA_MAX_SWITCHES        4
  33 #define DSA_MAX_PORTS           12
  34
  35 struct dsa_chip_data {
  36         /*
  37          * How to access the switch configuration registers.
  38          */
  39         struct device   *host_dev;
  40         int             sw_addr;
  41
  42         /* set to size of eeprom if supported by the switch */
  43         int             eeprom_len;
  44
  45         /* Device tree node pointer for this specific switch chip
  46          * used during switch setup in case additional properties
  47          * and resources needs to be used
  48          */
  49         struct device_node *of_node;
  50
  51         /*
  52          * The names of the switch's ports.  Use "cpu" to
  53          * designate the switch port that the cpu is connected to,
  54          * "dsa" to indicate that this port is a DSA link to
  55          * another switch, NULL to indicate the port is unused,
  56          * or any other string to indicate this is a physical port.
  57          */
  58         char            *port_names[DSA_MAX_PORTS];
  59         struct device_node *port_dn[DSA_MAX_PORTS];
  60
  61         /*
  62          * An array (with nr_chips elements) of which element [a]
  63          * indicates which port on this switch should be used to
  64          * send packets to that are destined for switch a.  Can be
  65          * NULL if there is only one switch chip.
  66          */
  67         s8              *rtable;
  68
  69         /*
  70          * A switch may have a GPIO line tied to its reset pin. Parse
  71          * this from the device tree, and use it before performing
  72          * switch soft reset.
  73          */
  74         struct gpio_desc *reset;
  75 };
  76
  77 struct dsa_platform_data {
  78         /*
  79          * Reference to a Linux network interface that connects
  80          * to the root switch chip of the tree.
  81          */
  82         struct device   *netdev;
  83         struct net_device *of_netdev;
  84
  85         /*
  86          * Info structs describing each of the switch chips
  87          * connected via this network interface.
  88          */
  89         int             nr_chips;
  90         struct dsa_chip_data    *chip;
  91 };
  92
  93 struct packet_type;
  94
  95 struct dsa_switch_tree {
  96         /*
  97          * Configuration data for the platform device that owns
  98          * this dsa switch tree instance.
  99          */
 100         struct dsa_platform_data        *pd;
 101
 102         /*
 103          * Reference to network device to use, and which tagging
 104          * protocol to use.
 105          */
 106         struct net_device       *master_netdev;
 107         int                     (*rcv)(struct sk_buff *skb,
 108                                        struct net_device *dev,
 109                                        struct packet_type *pt,
 110                                        struct net_device *orig_dev);
 111         enum dsa_tag_protocol   tag_protocol;
 112
 113         /*
 114          * The switch and port to which the CPU is attached.
 115          */
 116         s8                      cpu_switch;
 117         s8                      cpu_port;
 118
 119         /*
 120          * Data for the individual switch chips.
 121          */
 122         struct dsa_switch       *ds[DSA_MAX_SWITCHES];
 123 };
 124
 125 struct dsa_switch {
 126         /*
 127          * Parent switch tree, and switch index.
 128          */
 129         struct dsa_switch_tree  *dst;
 130         int                     index;
 131
 132         /*
 133          * Tagging protocol understood by this switch
 134          */
 135         enum dsa_tag_protocol   tag_protocol;
 136
 137         /*
 138          * Configuration data for this switch.
 139          */
 140         struct dsa_chip_data    *pd;
 141
 142         /*
 143          * The used switch driver.
 144          */
 145         struct dsa_switch_driver        *drv;
 146
 147         /*
 148          * Reference to host device to use.
 149          */
 150         struct device           *master_dev;
 151
 152 #ifdef CONFIG_NET_DSA_HWMON
 153         /*
 154          * Hardware monitoring information
 155          */
 156         char                    hwmon_name[IFNAMSIZ + 8];
 157         struct device           *hwmon_dev;
 158 #endif
 159
 160         /*
 161          * Slave mii_bus and devices for the individual ports.
 162          */
 163         u32                     dsa_port_mask;
 164         u32                     phys_port_mask;
 165         u32                     phys_mii_mask;
 166         struct mii_bus          *slave_mii_bus;
 167         struct net_device       *ports[DSA_MAX_PORTS];
 168 };
 169
 170 static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p)
 171 {
 172         return !!(ds->index == ds->dst->cpu_switch && p == ds->dst->cpu_port);
 173 }
 174
 175 static inline bool dsa_is_dsa_port(struct dsa_switch *ds, int p)
 176 {
 177         return !!((ds->dsa_port_mask) & (1 << p));
 178 }
 179
 180 static inline bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
 181 {
 182         return ds->phys_port_mask & (1 << p) && ds->ports[p];
 183 }
 184
 185 static inline u8 dsa_upstream_port(struct dsa_switch *ds)
 186 {
 187         struct dsa_switch_tree *dst = ds->dst;
 188
 189         /*
 190          * If this is the root switch (i.e. the switch that connects
 191          * to the CPU), return the cpu port number on this switch.
 192          * Else return the (DSA) port number that connects to the
 193          * switch that is one hop closer to the cpu.
 194          */
 195         if (dst->cpu_switch == ds->index)
 196                 return dst->cpu_port;
 197         else
 198                 return ds->pd->rtable[dst->cpu_switch];
 199 }
 200
 201 struct switchdev_trans;
 202 struct switchdev_obj;
 203 struct switchdev_obj_port_fdb;
 204 struct switchdev_obj_port_vlan;
 205
 206 struct dsa_switch_driver {
 207         struct list_head        list;
 208
 209         enum dsa_tag_protocol   tag_protocol;
 210         int                     priv_size;
 211
 212         /*
 213          * Probing and setup.
 214          */
 215         char    *(*probe)(struct device *host_dev, int sw_addr);
 216         int     (*setup)(struct dsa_switch *ds);
 217         int     (*set_addr)(struct dsa_switch *ds, u8 *addr);
 218         u32     (*get_phy_flags)(struct dsa_switch *ds, int port);
 219
 220         /*
 221          * Access to the switch's PHY registers.
 222          */
 223         int     (*phy_read)(struct dsa_switch *ds, int port, int regnum);
 224         int     (*phy_write)(struct dsa_switch *ds, int port,
 225                              int regnum, u16 val);
 226
 227         /*
 228          * Link state adjustment (called from libphy)
 229          */
 230         void    (*adjust_link)(struct dsa_switch *ds, int port,
 231                                 struct phy_device *phydev);
 232         void    (*fixed_link_update)(struct dsa_switch *ds, int port,
 233                                 struct fixed_phy_status *st);
 234
 235         /*
 236          * ethtool hardware statistics.
 237          */
 238         void    (*get_strings)(struct dsa_switch *ds, int port, uint8_t *data);
 239         void    (*get_ethtool_stats)(struct dsa_switch *ds,
 240                                      int port, uint64_t *data);
 241         int     (*get_sset_count)(struct dsa_switch *ds);
 242
 243         /*
 244          * ethtool Wake-on-LAN
 245          */
 246         void    (*get_wol)(struct dsa_switch *ds, int port,
 247                            struct ethtool_wolinfo *w);
 248         int     (*set_wol)(struct dsa_switch *ds, int port,
 249                            struct ethtool_wolinfo *w);
 250
 251         /*
 252          * Suspend and resume
 253          */
 254         int     (*suspend)(struct dsa_switch *ds);
 255         int     (*resume)(struct dsa_switch *ds);
 256
 257         /*
 258          * Port enable/disable
 259          */
 260         int     (*port_enable)(struct dsa_switch *ds, int port,
 261                                struct phy_device *phy);
 262         void    (*port_disable)(struct dsa_switch *ds, int port,
 263                                 struct phy_device *phy);
 264
 265         /*
 266          * EEE setttings
 267          */
 268         int     (*set_eee)(struct dsa_switch *ds, int port,
 269                            struct phy_device *phydev,
 270                            struct ethtool_eee *e);
 271         int     (*get_eee)(struct dsa_switch *ds, int port,
 272                            struct ethtool_eee *e);
 273
 274 #ifdef CONFIG_NET_DSA_HWMON
 275         /* Hardware monitoring */
 276         int     (*get_temp)(struct dsa_switch *ds, int *temp);
 277         int     (*get_temp_limit)(struct dsa_switch *ds, int *temp);
 278         int     (*set_temp_limit)(struct dsa_switch *ds, int temp);
 279         int     (*get_temp_alarm)(struct dsa_switch *ds, bool *alarm);
 280 #endif
 281
 282         /* EEPROM access */
 283         int     (*get_eeprom_len)(struct dsa_switch *ds);
 284         int     (*get_eeprom)(struct dsa_switch *ds,
 285                               struct ethtool_eeprom *eeprom, u8 *data);
 286         int     (*set_eeprom)(struct dsa_switch *ds,
 287                               struct ethtool_eeprom *eeprom, u8 *data);
 288
 289         /*
 290          * Register access.
 291          */
 292         int     (*get_regs_len)(struct dsa_switch *ds, int port);
 293         void    (*get_regs)(struct dsa_switch *ds, int port,
 294                             struct ethtool_regs *regs, void *p);
 295
 296         /*
 297          * Bridge integration
 298          */
 299         int     (*port_bridge_join)(struct dsa_switch *ds, int port,
 300                                     struct net_device *bridge);
 301         void    (*port_bridge_leave)(struct dsa_switch *ds, int port);
 302         void    (*port_stp_state_set)(struct dsa_switch *ds, int port,
 303                                       u8 state);
 304
 305         /*
 306          * VLAN support
 307          */
 308         int     (*port_vlan_filtering)(struct dsa_switch *ds, int port,
 309                                        bool vlan_filtering);
 310         int     (*port_vlan_prepare)(struct dsa_switch *ds, int port,
 311                                      const struct switchdev_obj_port_vlan *vlan,
 312                                      struct switchdev_trans *trans);
 313         void    (*port_vlan_add)(struct dsa_switch *ds, int port,
 314                                  const struct switchdev_obj_port_vlan *vlan,
 315                                  struct switchdev_trans *trans);
 316         int     (*port_vlan_del)(struct dsa_switch *ds, int port,
 317                                  const struct switchdev_obj_port_vlan *vlan);
 318         int     (*port_vlan_dump)(struct dsa_switch *ds, int port,
 319                                   struct switchdev_obj_port_vlan *vlan,
 320                                   int (*cb)(struct switchdev_obj *obj));
 321
 322         /*
 323          * Forwarding database
 324          */
 325         int     (*port_fdb_prepare)(struct dsa_switch *ds, int port,
 326                                     const struct switchdev_obj_port_fdb *fdb,
 327                                     struct switchdev_trans *trans);
 328         void    (*port_fdb_add)(struct dsa_switch *ds, int port,
 329                                 const struct switchdev_obj_port_fdb *fdb,
 330                                 struct switchdev_trans *trans);
 331         int     (*port_fdb_del)(struct dsa_switch *ds, int port,
 332                                 const struct switchdev_obj_port_fdb *fdb);
 333         int     (*port_fdb_dump)(struct dsa_switch *ds, int port,
 334                                  struct switchdev_obj_port_fdb *fdb,
 335                                  int (*cb)(struct switchdev_obj *obj));
 336 };
 337
 338 void register_switch_driver(struct dsa_switch_driver *type);
 339 void unregister_switch_driver(struct dsa_switch_driver *type);
 340 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev);
 341
 342 static inline void *ds_to_priv(struct dsa_switch *ds)
 343 {
 344         return (void *)(ds + 1);
 345 }
 346
 347 static inline bool dsa_uses_tagged_protocol(struct dsa_switch_tree *dst)
 348 {
 349         return dst->rcv != NULL;
 350 }
 351 #endif