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/phy.h>
  20 #include <linux/phy_fixed.h>
  21
  22 enum dsa_tag_protocol {
  23         DSA_TAG_PROTO_NONE = 0,
  24         DSA_TAG_PROTO_DSA,
  25         DSA_TAG_PROTO_TRAILER,
  26         DSA_TAG_PROTO_EDSA,
  27         DSA_TAG_PROTO_BRCM,
  28 };
  29
  30 #define DSA_MAX_SWITCHES        4
  31 #define DSA_MAX_PORTS           12
  32
  33 struct dsa_chip_data {
  34         /*
  35          * How to access the switch configuration registers.
  36          */
  37         struct device   *host_dev;
  38         int             sw_addr;
  39
  40         /* Device tree node pointer for this specific switch chip
  41          * used during switch setup in case additional properties
  42          * and resources needs to be used
  43          */
  44         struct device_node *of_node;
  45
  46         /*
  47          * The names of the switch's ports.  Use "cpu" to
  48          * designate the switch port that the cpu is connected to,
  49          * "dsa" to indicate that this port is a DSA link to
  50          * another switch, NULL to indicate the port is unused,
  51          * or any other string to indicate this is a physical port.
  52          */
  53         char            *port_names[DSA_MAX_PORTS];
  54         struct device_node *port_dn[DSA_MAX_PORTS];
  55
  56         /*
  57          * An array (with nr_chips elements) of which element [a]
  58          * indicates which port on this switch should be used to
  59          * send packets to that are destined for switch a.  Can be
  60          * NULL if there is only one switch chip.
  61          */
  62         s8              *rtable;
  63 };
  64
  65 struct dsa_platform_data {
  66         /*
  67          * Reference to a Linux network interface that connects
  68          * to the root switch chip of the tree.
  69          */
  70         struct device   *netdev;
  71
  72         /*
  73          * Info structs describing each of the switch chips
  74          * connected via this network interface.
  75          */
  76         int             nr_chips;
  77         struct dsa_chip_data    *chip;
  78 };
  79
  80 struct packet_type;
  81
  82 struct dsa_switch_tree {
  83         /*
  84          * Configuration data for the platform device that owns
  85          * this dsa switch tree instance.
  86          */
  87         struct dsa_platform_data        *pd;
  88
  89         /*
  90          * Reference to network device to use, and which tagging
  91          * protocol to use.
  92          */
  93         struct net_device       *master_netdev;
  94         int                     (*rcv)(struct sk_buff *skb,
  95                                        struct net_device *dev,
  96                                        struct packet_type *pt,
  97                                        struct net_device *orig_dev);
  98         enum dsa_tag_protocol   tag_protocol;
  99
 100         /*
 101          * The switch and port to which the CPU is attached.
 102          */
 103         s8                      cpu_switch;
 104         s8                      cpu_port;
 105
 106         /*
 107          * Link state polling.
 108          */
 109         int                     link_poll_needed;
 110         struct work_struct      link_poll_work;
 111         struct timer_list       link_poll_timer;
 112
 113         /*
 114          * Data for the individual switch chips.
 115          */
 116         struct dsa_switch       *ds[DSA_MAX_SWITCHES];
 117 };
 118
 119 struct dsa_switch {
 120         /*
 121          * Parent switch tree, and switch index.
 122          */
 123         struct dsa_switch_tree  *dst;
 124         int                     index;
 125
 126         /*
 127          * Configuration data for this switch.
 128          */
 129         struct dsa_chip_data    *pd;
 130
 131         /*
 132          * The used switch driver.
 133          */
 134         struct dsa_switch_driver        *drv;
 135
 136         /*
 137          * Reference to host device to use.
 138          */
 139         struct device           *master_dev;
 140
 141         /*
 142          * Slave mii_bus and devices for the individual ports.
 143          */
 144         u32                     dsa_port_mask;
 145         u32                     phys_port_mask;
 146         u32                     phys_mii_mask;
 147         struct mii_bus          *slave_mii_bus;
 148         struct net_device       *ports[DSA_MAX_PORTS];
 149 };
 150
 151 static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p)
 152 {
 153         return !!(ds->index == ds->dst->cpu_switch && p == ds->dst->cpu_port);
 154 }
 155
 156 static inline u8 dsa_upstream_port(struct dsa_switch *ds)
 157 {
 158         struct dsa_switch_tree *dst = ds->dst;
 159
 160         /*
 161          * If this is the root switch (i.e. the switch that connects
 162          * to the CPU), return the cpu port number on this switch.
 163          * Else return the (DSA) port number that connects to the
 164          * switch that is one hop closer to the cpu.
 165          */
 166         if (dst->cpu_switch == ds->index)
 167                 return dst->cpu_port;
 168         else
 169                 return ds->pd->rtable[dst->cpu_switch];
 170 }
 171
 172 struct dsa_switch_driver {
 173         struct list_head        list;
 174
 175         enum dsa_tag_protocol   tag_protocol;
 176         int                     priv_size;
 177
 178         /*
 179          * Probing and setup.
 180          */
 181         char    *(*probe)(struct device *host_dev, int sw_addr);
 182         int     (*setup)(struct dsa_switch *ds);
 183         int     (*set_addr)(struct dsa_switch *ds, u8 *addr);
 184         u32     (*get_phy_flags)(struct dsa_switch *ds, int port);
 185
 186         /*
 187          * Access to the switch's PHY registers.
 188          */
 189         int     (*phy_read)(struct dsa_switch *ds, int port, int regnum);
 190         int     (*phy_write)(struct dsa_switch *ds, int port,
 191                              int regnum, u16 val);
 192
 193         /*
 194          * Link state polling and IRQ handling.
 195          */
 196         void    (*poll_link)(struct dsa_switch *ds);
 197
 198         /*
 199          * Link state adjustment (called from libphy)
 200          */
 201         void    (*adjust_link)(struct dsa_switch *ds, int port,
 202                                 struct phy_device *phydev);
 203         void    (*fixed_link_update)(struct dsa_switch *ds, int port,
 204                                 struct fixed_phy_status *st);
 205
 206         /*
 207          * ethtool hardware statistics.
 208          */
 209         void    (*get_strings)(struct dsa_switch *ds, int port, uint8_t *data);
 210         void    (*get_ethtool_stats)(struct dsa_switch *ds,
 211                                      int port, uint64_t *data);
 212         int     (*get_sset_count)(struct dsa_switch *ds);
 213
 214         /*
 215          * ethtool Wake-on-LAN
 216          */
 217         void    (*get_wol)(struct dsa_switch *ds, int port,
 218                            struct ethtool_wolinfo *w);
 219         int     (*set_wol)(struct dsa_switch *ds, int port,
 220                            struct ethtool_wolinfo *w);
 221
 222         /*
 223          * Suspend and resume
 224          */
 225         int     (*suspend)(struct dsa_switch *ds);
 226         int     (*resume)(struct dsa_switch *ds);
 227
 228         /*
 229          * Port enable/disable
 230          */
 231         int     (*port_enable)(struct dsa_switch *ds, int port,
 232                                struct phy_device *phy);
 233         void    (*port_disable)(struct dsa_switch *ds, int port,
 234                                 struct phy_device *phy);
 235 };
 236
 237 void register_switch_driver(struct dsa_switch_driver *type);
 238 void unregister_switch_driver(struct dsa_switch_driver *type);
 239 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev);
 240
 241 static inline void *ds_to_priv(struct dsa_switch *ds)
 242 {
 243         return (void *)(ds + 1);
 244 }
 245
 246 static inline bool dsa_uses_tagged_protocol(struct dsa_switch_tree *dst)
 247 {
 248         return dst->rcv != NULL;
 249 }
 250 #endif