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1 | /* |
2 | * include/net/dsa.h - Driver for Distributed Switch Architecture switch chips | |
e84665c9 | 3 | * Copyright (c) 2008-2009 Marvell Semiconductor |
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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 | ||
ea1f51be | 14 | #include <linux/if_ether.h> |
c8f0b869 | 15 | #include <linux/list.h> |
cf50dcc2 BH |
16 | #include <linux/timer.h> |
17 | #include <linux/workqueue.h> | |
18 | ||
e84665c9 LB |
19 | #define DSA_MAX_SWITCHES 4 |
20 | #define DSA_MAX_PORTS 12 | |
21 | ||
22 | struct dsa_chip_data { | |
23 | /* | |
24 | * How to access the switch configuration registers. | |
25 | */ | |
26 | struct device *mii_bus; | |
27 | int sw_addr; | |
28 | ||
29 | /* | |
30 | * The names of the switch's ports. Use "cpu" to | |
31 | * designate the switch port that the cpu is connected to, | |
32 | * "dsa" to indicate that this port is a DSA link to | |
33 | * another switch, NULL to indicate the port is unused, | |
34 | * or any other string to indicate this is a physical port. | |
35 | */ | |
36 | char *port_names[DSA_MAX_PORTS]; | |
37 | ||
38 | /* | |
39 | * An array (with nr_chips elements) of which element [a] | |
40 | * indicates which port on this switch should be used to | |
41 | * send packets to that are destined for switch a. Can be | |
42 | * NULL if there is only one switch chip. | |
43 | */ | |
44 | s8 *rtable; | |
45 | }; | |
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46 | |
47 | struct dsa_platform_data { | |
48 | /* | |
49 | * Reference to a Linux network interface that connects | |
e84665c9 | 50 | * to the root switch chip of the tree. |
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51 | */ |
52 | struct device *netdev; | |
53 | ||
54 | /* | |
e84665c9 LB |
55 | * Info structs describing each of the switch chips |
56 | * connected via this network interface. | |
91da11f8 | 57 | */ |
e84665c9 LB |
58 | int nr_chips; |
59 | struct dsa_chip_data *chip; | |
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60 | }; |
61 | ||
cf50dcc2 BH |
62 | struct dsa_switch_tree { |
63 | /* | |
64 | * Configuration data for the platform device that owns | |
65 | * this dsa switch tree instance. | |
66 | */ | |
67 | struct dsa_platform_data *pd; | |
68 | ||
69 | /* | |
70 | * Reference to network device to use, and which tagging | |
71 | * protocol to use. | |
72 | */ | |
73 | struct net_device *master_netdev; | |
74 | __be16 tag_protocol; | |
75 | ||
76 | /* | |
77 | * The switch and port to which the CPU is attached. | |
78 | */ | |
79 | s8 cpu_switch; | |
80 | s8 cpu_port; | |
81 | ||
82 | /* | |
83 | * Link state polling. | |
84 | */ | |
85 | int link_poll_needed; | |
86 | struct work_struct link_poll_work; | |
87 | struct timer_list link_poll_timer; | |
88 | ||
89 | /* | |
90 | * Data for the individual switch chips. | |
91 | */ | |
92 | struct dsa_switch *ds[DSA_MAX_SWITCHES]; | |
93 | }; | |
94 | ||
c8f0b869 BH |
95 | struct dsa_switch { |
96 | /* | |
97 | * Parent switch tree, and switch index. | |
98 | */ | |
99 | struct dsa_switch_tree *dst; | |
100 | int index; | |
101 | ||
102 | /* | |
103 | * Configuration data for this switch. | |
104 | */ | |
105 | struct dsa_chip_data *pd; | |
106 | ||
107 | /* | |
108 | * The used switch driver. | |
109 | */ | |
110 | struct dsa_switch_driver *drv; | |
111 | ||
112 | /* | |
113 | * Reference to mii bus to use. | |
114 | */ | |
115 | struct mii_bus *master_mii_bus; | |
116 | ||
117 | /* | |
118 | * Slave mii_bus and devices for the individual ports. | |
119 | */ | |
120 | u32 dsa_port_mask; | |
121 | u32 phys_port_mask; | |
122 | struct mii_bus *slave_mii_bus; | |
123 | struct net_device *ports[DSA_MAX_PORTS]; | |
124 | }; | |
125 | ||
126 | static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p) | |
127 | { | |
128 | return !!(ds->index == ds->dst->cpu_switch && p == ds->dst->cpu_port); | |
129 | } | |
130 | ||
131 | static inline u8 dsa_upstream_port(struct dsa_switch *ds) | |
132 | { | |
133 | struct dsa_switch_tree *dst = ds->dst; | |
134 | ||
135 | /* | |
136 | * If this is the root switch (i.e. the switch that connects | |
137 | * to the CPU), return the cpu port number on this switch. | |
138 | * Else return the (DSA) port number that connects to the | |
139 | * switch that is one hop closer to the cpu. | |
140 | */ | |
141 | if (dst->cpu_switch == ds->index) | |
142 | return dst->cpu_port; | |
143 | else | |
144 | return ds->pd->rtable[dst->cpu_switch]; | |
145 | } | |
146 | ||
147 | struct dsa_switch_driver { | |
148 | struct list_head list; | |
149 | ||
150 | __be16 tag_protocol; | |
151 | int priv_size; | |
152 | ||
153 | /* | |
154 | * Probing and setup. | |
155 | */ | |
156 | char *(*probe)(struct mii_bus *bus, int sw_addr); | |
157 | int (*setup)(struct dsa_switch *ds); | |
158 | int (*set_addr)(struct dsa_switch *ds, u8 *addr); | |
159 | ||
160 | /* | |
161 | * Access to the switch's PHY registers. | |
162 | */ | |
163 | int (*phy_read)(struct dsa_switch *ds, int port, int regnum); | |
164 | int (*phy_write)(struct dsa_switch *ds, int port, | |
165 | int regnum, u16 val); | |
166 | ||
167 | /* | |
168 | * Link state polling and IRQ handling. | |
169 | */ | |
170 | void (*poll_link)(struct dsa_switch *ds); | |
171 | ||
172 | /* | |
173 | * ethtool hardware statistics. | |
174 | */ | |
175 | void (*get_strings)(struct dsa_switch *ds, int port, uint8_t *data); | |
176 | void (*get_ethtool_stats)(struct dsa_switch *ds, | |
177 | int port, uint64_t *data); | |
178 | int (*get_sset_count)(struct dsa_switch *ds); | |
179 | }; | |
180 | ||
181 | void register_switch_driver(struct dsa_switch_driver *type); | |
182 | void unregister_switch_driver(struct dsa_switch_driver *type); | |
183 | ||
7fa857ed FF |
184 | static inline void *ds_to_priv(struct dsa_switch *ds) |
185 | { | |
186 | return (void *)(ds + 1); | |
187 | } | |
188 | ||
cf50dcc2 BH |
189 | /* |
190 | * The original DSA tag format and some other tag formats have no | |
191 | * ethertype, which means that we need to add a little hack to the | |
192 | * networking receive path to make sure that received frames get | |
193 | * the right ->protocol assigned to them when one of those tag | |
194 | * formats is in use. | |
195 | */ | |
196 | static inline bool dsa_uses_dsa_tags(struct dsa_switch_tree *dst) | |
197 | { | |
198 | return !!(dst->tag_protocol == htons(ETH_P_DSA)); | |
199 | } | |
cf85d08f | 200 | |
cf50dcc2 BH |
201 | static inline bool dsa_uses_trailer_tags(struct dsa_switch_tree *dst) |
202 | { | |
203 | return !!(dst->tag_protocol == htons(ETH_P_TRAILER)); | |
204 | } | |
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205 | |
206 | #endif |