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;
22 int cap_plug_events; /* offset, zero if not found */
23 bool is_unplugged; /* unplugged, will go away */
27 * struct tb_port - a thunderbolt port, part of a tb_switch
30 struct tb_regs_port_header config;
32 struct tb_port *remote; /* remote port, NULL if not connected */
33 int cap_phy; /* offset, zero if not found */
34 u8 port; /* port number on switch */
38 * struct tb_path_hop - routing information for a tb_path
40 * Hop configuration is always done on the IN port of a switch.
41 * in_port and out_port have to be on the same switch. Packets arriving on
42 * in_port with "hop" = in_hop_index will get routed to through out_port. The
43 * next hop to take (on out_port->remote) is determined by next_hop_index.
45 * in_counter_index is the index of a counter (in TB_CFG_COUNTERS) on the in
49 struct tb_port *in_port;
50 struct tb_port *out_port;
52 int in_counter_index; /* write -1 to disable counters for this hop. */
57 * enum tb_path_port - path options mask
61 TB_PATH_SOURCE = 1, /* activate on the first hop (out of src) */
62 TB_PATH_INTERNAL = 2, /* activate on other hops (not the first/last) */
63 TB_PATH_DESTINATION = 4, /* activate on the last hop (into dst) */
68 * struct tb_path - a unidirectional path between two ports
70 * A path consists of a number of hops (see tb_path_hop). To establish a PCIe
71 * tunnel two paths have to be created between the two PCIe ports.
76 int nfc_credits; /* non flow controlled credits */
77 enum tb_path_port ingress_shared_buffer;
78 enum tb_path_port egress_shared_buffer;
79 enum tb_path_port ingress_fc_enable;
80 enum tb_path_port egress_fc_enable;
86 struct tb_path_hop *hops;
87 int path_length; /* number of hops */
92 * struct tb - main thunderbolt bus structure
96 * Big lock. Must be held when accessing cfg or
97 * any struct tb_switch / struct tb_port.
101 struct workqueue_struct *wq; /* ordered workqueue for plug events */
102 struct tb_switch *root_switch;
103 bool hotplug_active; /*
104 * tb_handle_hotplug will stop progressing plug
105 * events and exit if this is not set (it needs to
106 * acquire the lock one more time). Used to drain
107 * wq after cfg has been paused.
112 /* helper functions & macros */
115 * tb_upstream_port() - return the upstream port of a switch
117 * Every switch has an upstream port (for the root switch it is the NHI).
119 * During switch alloc/init tb_upstream_port()->remote may be NULL, even for
120 * non root switches (on the NHI port remote is always NULL).
122 * Return: Returns the upstream port of the switch.
124 static inline struct tb_port *tb_upstream_port(struct tb_switch *sw)
126 return &sw->ports[sw->config.upstream_port_number];
129 static inline u64 tb_route(struct tb_switch *sw)
131 return ((u64) sw->config.route_hi) << 32 | sw->config.route_lo;
134 static inline int tb_sw_read(struct tb_switch *sw, void *buffer,
135 enum tb_cfg_space space, u32 offset, u32 length)
137 return tb_cfg_read(sw->tb->ctl,
146 static inline int tb_sw_write(struct tb_switch *sw, void *buffer,
147 enum tb_cfg_space space, u32 offset, u32 length)
149 return tb_cfg_write(sw->tb->ctl,
158 static inline int tb_port_read(struct tb_port *port, void *buffer,
159 enum tb_cfg_space space, u32 offset, u32 length)
161 return tb_cfg_read(port->sw->tb->ctl,
170 static inline int tb_port_write(struct tb_port *port, void *buffer,
171 enum tb_cfg_space space, u32 offset, u32 length)
173 return tb_cfg_write(port->sw->tb->ctl,
182 #define tb_err(tb, fmt, arg...) dev_err(&(tb)->nhi->pdev->dev, fmt, ## arg)
183 #define tb_WARN(tb, fmt, arg...) dev_WARN(&(tb)->nhi->pdev->dev, fmt, ## arg)
184 #define tb_warn(tb, fmt, arg...) dev_warn(&(tb)->nhi->pdev->dev, fmt, ## arg)
185 #define tb_info(tb, fmt, arg...) dev_info(&(tb)->nhi->pdev->dev, fmt, ## arg)
188 #define __TB_SW_PRINT(level, sw, fmt, arg...) \
190 struct tb_switch *__sw = (sw); \
191 level(__sw->tb, "%llx: " fmt, \
192 tb_route(__sw), ## arg); \
194 #define tb_sw_WARN(sw, fmt, arg...) __TB_SW_PRINT(tb_WARN, sw, fmt, ##arg)
195 #define tb_sw_warn(sw, fmt, arg...) __TB_SW_PRINT(tb_warn, sw, fmt, ##arg)
196 #define tb_sw_info(sw, fmt, arg...) __TB_SW_PRINT(tb_info, sw, fmt, ##arg)
199 #define __TB_PORT_PRINT(level, _port, fmt, arg...) \
201 struct tb_port *__port = (_port); \
202 level(__port->sw->tb, "%llx:%x: " fmt, \
203 tb_route(__port->sw), __port->port, ## arg); \
205 #define tb_port_WARN(port, fmt, arg...) \
206 __TB_PORT_PRINT(tb_WARN, port, fmt, ##arg)
207 #define tb_port_warn(port, fmt, arg...) \
208 __TB_PORT_PRINT(tb_warn, port, fmt, ##arg)
209 #define tb_port_info(port, fmt, arg...) \
210 __TB_PORT_PRINT(tb_info, port, fmt, ##arg)
213 struct tb *thunderbolt_alloc_and_start(struct tb_nhi *nhi);
214 void thunderbolt_shutdown_and_free(struct tb *tb);
216 struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route);
217 void tb_switch_free(struct tb_switch *sw);
218 void tb_sw_set_unpplugged(struct tb_switch *sw);
219 struct tb_switch *get_switch_at_route(struct tb_switch *sw, u64 route);
221 int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged);
222 int tb_port_add_nfc_credits(struct tb_port *port, int credits);
223 int tb_port_clear_counter(struct tb_port *port, int counter);
225 int tb_find_cap(struct tb_port *port, enum tb_cfg_space space, u32 value);
227 struct tb_path *tb_path_alloc(struct tb *tb, int num_hops);
228 void tb_path_free(struct tb_path *path);
229 int tb_path_activate(struct tb_path *path);
230 void tb_path_deactivate(struct tb_path *path);
231 bool tb_path_is_invalid(struct tb_path *path);
234 static inline int tb_route_length(u64 route)
236 return (fls64(route) + TB_ROUTE_SHIFT - 1) / TB_ROUTE_SHIFT;
239 static inline bool tb_is_upstream_port(struct tb_port *port)
241 return port == tb_upstream_port(port->sw);
245 * tb_downstream_route() - get route to downstream switch
247 * Port must not be the upstream port (otherwise a loop is created).
249 * Return: Returns a route to the switch behind @port.
251 static inline u64 tb_downstream_route(struct tb_port *port)
253 return tb_route(port->sw)
254 | ((u64) port->port << (port->sw->config.depth * 8));