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 #include <linux/ethtool.h> 22 23 enum dsa_tag_protocol { 24 DSA_TAG_PROTO_NONE = 0, 25 DSA_TAG_PROTO_DSA, 26 DSA_TAG_PROTO_TRAILER, 27 DSA_TAG_PROTO_EDSA, 28 DSA_TAG_PROTO_BRCM, 29 }; 30 31 #define DSA_MAX_SWITCHES 4 32 #define DSA_MAX_PORTS 12 33 34 struct dsa_chip_data { 35 /* 36 * How to access the switch configuration registers. 37 */ 38 struct device *host_dev; 39 int sw_addr; 40 41 /* Device tree node pointer for this specific switch chip 42 * used during switch setup in case additional properties 43 * and resources needs to be used 44 */ 45 struct device_node *of_node; 46 47 /* 48 * The names of the switch's ports. Use "cpu" to 49 * designate the switch port that the cpu is connected to, 50 * "dsa" to indicate that this port is a DSA link to 51 * another switch, NULL to indicate the port is unused, 52 * or any other string to indicate this is a physical port. 53 */ 54 char *port_names[DSA_MAX_PORTS]; 55 struct device_node *port_dn[DSA_MAX_PORTS]; 56 57 /* 58 * An array (with nr_chips elements) of which element [a] 59 * indicates which port on this switch should be used to 60 * send packets to that are destined for switch a. Can be 61 * NULL if there is only one switch chip. 62 */ 63 s8 *rtable; 64 }; 65 66 struct dsa_platform_data { 67 /* 68 * Reference to a Linux network interface that connects 69 * to the root switch chip of the tree. 70 */ 71 struct device *netdev; 72 73 /* 74 * Info structs describing each of the switch chips 75 * connected via this network interface. 76 */ 77 int nr_chips; 78 struct dsa_chip_data *chip; 79 }; 80 81 struct packet_type; 82 83 struct dsa_switch_tree { 84 /* 85 * Configuration data for the platform device that owns 86 * this dsa switch tree instance. 87 */ 88 struct dsa_platform_data *pd; 89 90 /* 91 * Reference to network device to use, and which tagging 92 * protocol to use. 93 */ 94 struct net_device *master_netdev; 95 int (*rcv)(struct sk_buff *skb, 96 struct net_device *dev, 97 struct packet_type *pt, 98 struct net_device *orig_dev); 99 enum dsa_tag_protocol tag_protocol; 100 101 /* 102 * The switch and port to which the CPU is attached. 103 */ 104 s8 cpu_switch; 105 s8 cpu_port; 106 107 /* 108 * Link state polling. 109 */ 110 int link_poll_needed; 111 struct work_struct link_poll_work; 112 struct timer_list link_poll_timer; 113 114 /* 115 * Data for the individual switch chips. 116 */ 117 struct dsa_switch *ds[DSA_MAX_SWITCHES]; 118 }; 119 120 struct dsa_switch { 121 /* 122 * Parent switch tree, and switch index. 123 */ 124 struct dsa_switch_tree *dst; 125 int index; 126 127 /* 128 * Configuration data for this switch. 129 */ 130 struct dsa_chip_data *pd; 131 132 /* 133 * The used switch driver. 134 */ 135 struct dsa_switch_driver *drv; 136 137 /* 138 * Reference to host device to use. 139 */ 140 struct device *master_dev; 141 142 /* 143 * Slave mii_bus and devices for the individual ports. 144 */ 145 u32 dsa_port_mask; 146 u32 phys_port_mask; 147 u32 phys_mii_mask; 148 struct mii_bus *slave_mii_bus; 149 struct net_device *ports[DSA_MAX_PORTS]; 150 }; 151 152 static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p) 153 { 154 return !!(ds->index == ds->dst->cpu_switch && p == ds->dst->cpu_port); 155 } 156 157 static inline u8 dsa_upstream_port(struct dsa_switch *ds) 158 { 159 struct dsa_switch_tree *dst = ds->dst; 160 161 /* 162 * If this is the root switch (i.e. the switch that connects 163 * to the CPU), return the cpu port number on this switch. 164 * Else return the (DSA) port number that connects to the 165 * switch that is one hop closer to the cpu. 166 */ 167 if (dst->cpu_switch == ds->index) 168 return dst->cpu_port; 169 else 170 return ds->pd->rtable[dst->cpu_switch]; 171 } 172 173 struct dsa_switch_driver { 174 struct list_head list; 175 176 enum dsa_tag_protocol tag_protocol; 177 int priv_size; 178 179 /* 180 * Probing and setup. 181 */ 182 char *(*probe)(struct device *host_dev, int sw_addr); 183 int (*setup)(struct dsa_switch *ds); 184 int (*set_addr)(struct dsa_switch *ds, u8 *addr); 185 u32 (*get_phy_flags)(struct dsa_switch *ds, int port); 186 187 /* 188 * Access to the switch's PHY registers. 189 */ 190 int (*phy_read)(struct dsa_switch *ds, int port, int regnum); 191 int (*phy_write)(struct dsa_switch *ds, int port, 192 int regnum, u16 val); 193 194 /* 195 * Link state polling and IRQ handling. 196 */ 197 void (*poll_link)(struct dsa_switch *ds); 198 199 /* 200 * Link state adjustment (called from libphy) 201 */ 202 void (*adjust_link)(struct dsa_switch *ds, int port, 203 struct phy_device *phydev); 204 void (*fixed_link_update)(struct dsa_switch *ds, int port, 205 struct fixed_phy_status *st); 206 207 /* 208 * ethtool hardware statistics. 209 */ 210 void (*get_strings)(struct dsa_switch *ds, int port, uint8_t *data); 211 void (*get_ethtool_stats)(struct dsa_switch *ds, 212 int port, uint64_t *data); 213 int (*get_sset_count)(struct dsa_switch *ds); 214 215 /* 216 * ethtool Wake-on-LAN 217 */ 218 void (*get_wol)(struct dsa_switch *ds, int port, 219 struct ethtool_wolinfo *w); 220 int (*set_wol)(struct dsa_switch *ds, int port, 221 struct ethtool_wolinfo *w); 222 223 /* 224 * Suspend and resume 225 */ 226 int (*suspend)(struct dsa_switch *ds); 227 int (*resume)(struct dsa_switch *ds); 228 229 /* 230 * Port enable/disable 231 */ 232 int (*port_enable)(struct dsa_switch *ds, int port, 233 struct phy_device *phy); 234 void (*port_disable)(struct dsa_switch *ds, int port, 235 struct phy_device *phy); 236 237 /* 238 * EEE setttings 239 */ 240 int (*set_eee)(struct dsa_switch *ds, int port, 241 struct phy_device *phydev, 242 struct ethtool_eee *e); 243 int (*get_eee)(struct dsa_switch *ds, int port, 244 struct ethtool_eee *e); 245 }; 246 247 void register_switch_driver(struct dsa_switch_driver *type); 248 void unregister_switch_driver(struct dsa_switch_driver *type); 249 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev); 250 251 static inline void *ds_to_priv(struct dsa_switch *ds) 252 { 253 return (void *)(ds + 1); 254 } 255 256 static inline bool dsa_uses_tagged_protocol(struct dsa_switch_tree *dst) 257 { 258 return dst->rcv != NULL; 259 } 260 #endif 261