2 * Thunderbolt Cactus Ridge driver - bus logic (NHI independent)
4 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
10 #include <linux/pci.h>
16 * struct tb_switch - a thunderbolt switch
19 struct tb_regs_switch_header config;
20 struct tb_port *ports;
23 int cap_plug_events; /* offset, zero if not found */
24 bool is_unplugged; /* unplugged, will go away */
29 * struct tb_port - a thunderbolt port, part of a tb_switch
32 struct tb_regs_port_header config;
34 struct tb_port *remote; /* remote port, NULL if not connected */
35 int cap_phy; /* offset, zero if not found */
36 u8 port; /* port number on switch */
37 bool disabled; /* disabled by eeprom */
38 struct tb_port *dual_link_port;
43 * struct tb_path_hop - routing information for a tb_path
45 * Hop configuration is always done on the IN port of a switch.
46 * in_port and out_port have to be on the same switch. Packets arriving on
47 * in_port with "hop" = in_hop_index will get routed to through out_port. The
48 * next hop to take (on out_port->remote) is determined by next_hop_index.
50 * in_counter_index is the index of a counter (in TB_CFG_COUNTERS) on the in
54 struct tb_port *in_port;
55 struct tb_port *out_port;
57 int in_counter_index; /* write -1 to disable counters for this hop. */
62 * enum tb_path_port - path options mask
66 TB_PATH_SOURCE = 1, /* activate on the first hop (out of src) */
67 TB_PATH_INTERNAL = 2, /* activate on other hops (not the first/last) */
68 TB_PATH_DESTINATION = 4, /* activate on the last hop (into dst) */
73 * struct tb_path - a unidirectional path between two ports
75 * A path consists of a number of hops (see tb_path_hop). To establish a PCIe
76 * tunnel two paths have to be created between the two PCIe ports.
81 int nfc_credits; /* non flow controlled credits */
82 enum tb_path_port ingress_shared_buffer;
83 enum tb_path_port egress_shared_buffer;
84 enum tb_path_port ingress_fc_enable;
85 enum tb_path_port egress_fc_enable;
91 struct tb_path_hop *hops;
92 int path_length; /* number of hops */
96 * struct tb_cm_ops - Connection manager specific operations vector
97 * @start: Starts the domain
98 * @stop: Stops the domain
99 * @suspend_noirq: Connection manager specific suspend_noirq
100 * @resume_noirq: Connection manager specific resume_noirq
101 * @hotplug: Handle hotplug event
104 int (*start)(struct tb *tb);
105 void (*stop)(struct tb *tb);
106 int (*suspend_noirq)(struct tb *tb);
107 int (*resume_noirq)(struct tb *tb);
112 * struct tb - main thunderbolt bus structure
113 * @dev: Domain device
114 * @lock: Big lock. Must be held when accessing cfg or any struct
115 * tb_switch / struct tb_port.
116 * @nhi: Pointer to the NHI structure
117 * @ctl: Control channel for this domain
118 * @wq: Ordered workqueue for all domain specific work
119 * @root_switch: Root switch of this domain
120 * @cm_ops: Connection manager specific operations vector
121 * @index: Linux assigned domain number
122 * @privdata: Private connection manager specific data
129 struct workqueue_struct *wq;
130 struct tb_switch *root_switch;
131 const struct tb_cm_ops *cm_ops;
133 unsigned long privdata[0];
136 static inline void *tb_priv(struct tb *tb)
138 return (void *)tb->privdata;
141 /* helper functions & macros */
144 * tb_upstream_port() - return the upstream port of a switch
146 * Every switch has an upstream port (for the root switch it is the NHI).
148 * During switch alloc/init tb_upstream_port()->remote may be NULL, even for
149 * non root switches (on the NHI port remote is always NULL).
151 * Return: Returns the upstream port of the switch.
153 static inline struct tb_port *tb_upstream_port(struct tb_switch *sw)
155 return &sw->ports[sw->config.upstream_port_number];
158 static inline u64 tb_route(struct tb_switch *sw)
160 return ((u64) sw->config.route_hi) << 32 | sw->config.route_lo;
163 static inline int tb_sw_read(struct tb_switch *sw, void *buffer,
164 enum tb_cfg_space space, u32 offset, u32 length)
166 return tb_cfg_read(sw->tb->ctl,
175 static inline int tb_sw_write(struct tb_switch *sw, void *buffer,
176 enum tb_cfg_space space, u32 offset, u32 length)
178 return tb_cfg_write(sw->tb->ctl,
187 static inline int tb_port_read(struct tb_port *port, void *buffer,
188 enum tb_cfg_space space, u32 offset, u32 length)
190 return tb_cfg_read(port->sw->tb->ctl,
199 static inline int tb_port_write(struct tb_port *port, const void *buffer,
200 enum tb_cfg_space space, u32 offset, u32 length)
202 return tb_cfg_write(port->sw->tb->ctl,
211 #define tb_err(tb, fmt, arg...) dev_err(&(tb)->nhi->pdev->dev, fmt, ## arg)
212 #define tb_WARN(tb, fmt, arg...) dev_WARN(&(tb)->nhi->pdev->dev, fmt, ## arg)
213 #define tb_warn(tb, fmt, arg...) dev_warn(&(tb)->nhi->pdev->dev, fmt, ## arg)
214 #define tb_info(tb, fmt, arg...) dev_info(&(tb)->nhi->pdev->dev, fmt, ## arg)
217 #define __TB_SW_PRINT(level, sw, fmt, arg...) \
219 struct tb_switch *__sw = (sw); \
220 level(__sw->tb, "%llx: " fmt, \
221 tb_route(__sw), ## arg); \
223 #define tb_sw_WARN(sw, fmt, arg...) __TB_SW_PRINT(tb_WARN, sw, fmt, ##arg)
224 #define tb_sw_warn(sw, fmt, arg...) __TB_SW_PRINT(tb_warn, sw, fmt, ##arg)
225 #define tb_sw_info(sw, fmt, arg...) __TB_SW_PRINT(tb_info, sw, fmt, ##arg)
228 #define __TB_PORT_PRINT(level, _port, fmt, arg...) \
230 struct tb_port *__port = (_port); \
231 level(__port->sw->tb, "%llx:%x: " fmt, \
232 tb_route(__port->sw), __port->port, ## arg); \
234 #define tb_port_WARN(port, fmt, arg...) \
235 __TB_PORT_PRINT(tb_WARN, port, fmt, ##arg)
236 #define tb_port_warn(port, fmt, arg...) \
237 __TB_PORT_PRINT(tb_warn, port, fmt, ##arg)
238 #define tb_port_info(port, fmt, arg...) \
239 __TB_PORT_PRINT(tb_info, port, fmt, ##arg)
241 struct tb *tb_probe(struct tb_nhi *nhi);
243 extern struct bus_type tb_bus_type;
244 extern struct device_type tb_domain_type;
246 int tb_domain_init(void);
247 void tb_domain_exit(void);
249 struct tb *tb_domain_alloc(struct tb_nhi *nhi, size_t privsize);
250 int tb_domain_add(struct tb *tb);
251 void tb_domain_remove(struct tb *tb);
252 int tb_domain_suspend_noirq(struct tb *tb);
253 int tb_domain_resume_noirq(struct tb *tb);
255 static inline void tb_domain_put(struct tb *tb)
257 put_device(&tb->dev);
260 struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route);
261 void tb_switch_free(struct tb_switch *sw);
262 void tb_switch_suspend(struct tb_switch *sw);
263 int tb_switch_resume(struct tb_switch *sw);
264 int tb_switch_reset(struct tb *tb, u64 route);
265 void tb_sw_set_unplugged(struct tb_switch *sw);
266 struct tb_switch *get_switch_at_route(struct tb_switch *sw, u64 route);
268 int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged);
269 int tb_port_add_nfc_credits(struct tb_port *port, int credits);
270 int tb_port_clear_counter(struct tb_port *port, int counter);
272 int tb_switch_find_vse_cap(struct tb_switch *sw, enum tb_switch_vse_cap vsec);
273 int tb_port_find_cap(struct tb_port *port, enum tb_port_cap cap);
275 struct tb_path *tb_path_alloc(struct tb *tb, int num_hops);
276 void tb_path_free(struct tb_path *path);
277 int tb_path_activate(struct tb_path *path);
278 void tb_path_deactivate(struct tb_path *path);
279 bool tb_path_is_invalid(struct tb_path *path);
281 int tb_drom_read(struct tb_switch *sw);
282 int tb_drom_read_uid_only(struct tb_switch *sw, u64 *uid);
285 static inline int tb_route_length(u64 route)
287 return (fls64(route) + TB_ROUTE_SHIFT - 1) / TB_ROUTE_SHIFT;
290 static inline bool tb_is_upstream_port(struct tb_port *port)
292 return port == tb_upstream_port(port->sw);
296 * tb_downstream_route() - get route to downstream switch
298 * Port must not be the upstream port (otherwise a loop is created).
300 * Return: Returns a route to the switch behind @port.
302 static inline u64 tb_downstream_route(struct tb_port *port)
304 return tb_route(port->sw)
305 | ((u64) port->port << (port->sw->config.depth * 8));