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 - main thunderbolt bus structure
42 * Big lock. Must be held when accessing cfg or
43 * any struct tb_switch / struct tb_port.
47 struct workqueue_struct *wq; /* ordered workqueue for plug events */
48 struct tb_switch *root_switch;
49 bool hotplug_active; /*
50 * tb_handle_hotplug will stop progressing plug
51 * events and exit if this is not set (it needs to
52 * acquire the lock one more time). Used to drain
53 * wq after cfg has been paused.
58 /* helper functions & macros */
61 * tb_upstream_port() - return the upstream port of a switch
63 * Every switch has an upstream port (for the root switch it is the NHI).
65 * During switch alloc/init tb_upstream_port()->remote may be NULL, even for
66 * non root switches (on the NHI port remote is always NULL).
68 * Return: Returns the upstream port of the switch.
70 static inline struct tb_port *tb_upstream_port(struct tb_switch *sw)
72 return &sw->ports[sw->config.upstream_port_number];
75 static inline u64 tb_route(struct tb_switch *sw)
77 return ((u64) sw->config.route_hi) << 32 | sw->config.route_lo;
80 static inline int tb_sw_read(struct tb_switch *sw, void *buffer,
81 enum tb_cfg_space space, u32 offset, u32 length)
83 return tb_cfg_read(sw->tb->ctl,
92 static inline int tb_sw_write(struct tb_switch *sw, void *buffer,
93 enum tb_cfg_space space, u32 offset, u32 length)
95 return tb_cfg_write(sw->tb->ctl,
104 static inline int tb_port_read(struct tb_port *port, void *buffer,
105 enum tb_cfg_space space, u32 offset, u32 length)
107 return tb_cfg_read(port->sw->tb->ctl,
116 static inline int tb_port_write(struct tb_port *port, void *buffer,
117 enum tb_cfg_space space, u32 offset, u32 length)
119 return tb_cfg_write(port->sw->tb->ctl,
128 #define tb_err(tb, fmt, arg...) dev_err(&(tb)->nhi->pdev->dev, fmt, ## arg)
129 #define tb_WARN(tb, fmt, arg...) dev_WARN(&(tb)->nhi->pdev->dev, fmt, ## arg)
130 #define tb_warn(tb, fmt, arg...) dev_warn(&(tb)->nhi->pdev->dev, fmt, ## arg)
131 #define tb_info(tb, fmt, arg...) dev_info(&(tb)->nhi->pdev->dev, fmt, ## arg)
134 #define __TB_SW_PRINT(level, sw, fmt, arg...) \
136 struct tb_switch *__sw = (sw); \
137 level(__sw->tb, "%llx: " fmt, \
138 tb_route(__sw), ## arg); \
140 #define tb_sw_WARN(sw, fmt, arg...) __TB_SW_PRINT(tb_WARN, sw, fmt, ##arg)
141 #define tb_sw_warn(sw, fmt, arg...) __TB_SW_PRINT(tb_warn, sw, fmt, ##arg)
142 #define tb_sw_info(sw, fmt, arg...) __TB_SW_PRINT(tb_info, sw, fmt, ##arg)
145 #define __TB_PORT_PRINT(level, _port, fmt, arg...) \
147 struct tb_port *__port = (_port); \
148 level(__port->sw->tb, "%llx:%x: " fmt, \
149 tb_route(__port->sw), __port->port, ## arg); \
151 #define tb_port_WARN(port, fmt, arg...) \
152 __TB_PORT_PRINT(tb_WARN, port, fmt, ##arg)
153 #define tb_port_warn(port, fmt, arg...) \
154 __TB_PORT_PRINT(tb_warn, port, fmt, ##arg)
155 #define tb_port_info(port, fmt, arg...) \
156 __TB_PORT_PRINT(tb_info, port, fmt, ##arg)
159 struct tb *thunderbolt_alloc_and_start(struct tb_nhi *nhi);
160 void thunderbolt_shutdown_and_free(struct tb *tb);
162 struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route);
163 void tb_switch_free(struct tb_switch *sw);
164 void tb_sw_set_unpplugged(struct tb_switch *sw);
165 struct tb_switch *get_switch_at_route(struct tb_switch *sw, u64 route);
167 int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged);
169 int tb_find_cap(struct tb_port *port, enum tb_cfg_space space, u32 value);
172 static inline int tb_route_length(u64 route)
174 return (fls64(route) + TB_ROUTE_SHIFT - 1) / TB_ROUTE_SHIFT;
177 static inline bool tb_is_upstream_port(struct tb_port *port)
179 return port == tb_upstream_port(port->sw);
183 * tb_downstream_route() - get route to downstream switch
185 * Port must not be the upstream port (otherwise a loop is created).
187 * Return: Returns a route to the switch behind @port.
189 static inline u64 tb_downstream_route(struct tb_port *port)
191 return tb_route(port->sw)
192 | ((u64) port->port << (port->sw->config.depth * 8));