/*
* Thunderbolt Cactus Ridge driver - bus logic (NHI independent)
*
* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
*/
#ifndef TB_H_
#define TB_H_
#include <linux/pci.h>
#include "tb_regs.h"
#include "ctl.h"
/**
* struct tb_switch - a thunderbolt switch
*/
struct tb_switch {
struct tb_regs_switch_header config;
struct tb_port *ports;
struct tb *tb;
u64 uid;
int cap_plug_events; /* offset, zero if not found */
bool is_unplugged; /* unplugged, will go away */
u8 *drom;
};
/**
* struct tb_port - a thunderbolt port, part of a tb_switch
*/
struct tb_port {
struct tb_regs_port_header config;
struct tb_switch *sw;
struct tb_port *remote; /* remote port, NULL if not connected */
int cap_phy; /* offset, zero if not found */
u8 port; /* port number on switch */
bool disabled; /* disabled by eeprom */
struct tb_port *dual_link_port;
u8 link_nr:1;
};
/**
* struct tb_path_hop - routing information for a tb_path
*
* Hop configuration is always done on the IN port of a switch.
* in_port and out_port have to be on the same switch. Packets arriving on
* in_port with "hop" = in_hop_index will get routed to through out_port. The
* next hop to take (on out_port->remote) is determined by next_hop_index.
*
* in_counter_index is the index of a counter (in TB_CFG_COUNTERS) on the in
* port.
*/
struct tb_path_hop {
struct tb_port *in_port;
struct tb_port *out_port;
int in_hop_index;
int in_counter_index; /* write -1 to disable counters for this hop. */
int next_hop_index;
};
/**
* enum tb_path_port - path options mask
*/
enum tb_path_port {
TB_PATH_NONE = 0,
TB_PATH_SOURCE = 1, /* activate on the first hop (out of src) */
TB_PATH_INTERNAL = 2, /* activate on other hops (not the first/last) */
TB_PATH_DESTINATION = 4, /* activate on the last hop (into dst) */
TB_PATH_ALL = 7,
};
/**
* struct tb_path - a unidirectional path between two ports
*
* A path consists of a number of hops (see tb_path_hop). To establish a PCIe
* tunnel two paths have to be created between the two PCIe ports.
*
*/
struct tb_path {
struct tb *tb;
int nfc_credits; /* non flow controlled credits */
enum tb_path_port ingress_shared_buffer;
enum tb_path_port egress_shared_buffer;
enum tb_path_port ingress_fc_enable;
enum tb_path_port egress_fc_enable;
int priority:3;
int weight:4;
bool drop_packages;
bool activated;
struct tb_path_hop *hops;
int path_length; /* number of hops */
};
/**
* struct tb - main thunderbolt bus structure
*/
struct tb {
struct mutex lock; /*
* Big lock. Must be held when accessing cfg or
* any struct tb_switch / struct tb_port.
*/
struct tb_nhi *nhi;
struct tb_ctl *ctl;
struct workqueue_struct *wq; /* ordered workqueue for plug events */
struct tb_switch *root_switch;
struct list_head tunnel_list; /* list of active PCIe tunnels */
bool hotplug_active; /*
* tb_handle_hotplug will stop progressing plug
* events and exit if this is not set (it needs to
* acquire the lock one more time). Used to drain
* wq after cfg has been paused.
*/
};
/* helper functions & macros */
/**
* tb_upstream_port() - return the upstream port of a switch
*
* Every switch has an upstream port (for the root switch it is the NHI).
*
* During switch alloc/init tb_upstream_port()->remote may be NULL, even for
* non root switches (on the NHI port remote is always NULL).
*
* Return: Returns the upstream port of the switch.
*/
static inline struct tb_port *tb_upstream_port(struct tb_switch *sw)
{
return &sw->ports[sw->config.upstream_port_number];
}
static inline u64 tb_route(struct tb_switch *sw)
{
return ((u64) sw->config.route_hi) << 32 | sw->config.route_lo;
}
static inline int tb_sw_read(struct tb_switch *sw, void *buffer,
enum tb_cfg_space space, u32 offset, u32 length)
{
return tb_cfg_read(sw->tb->ctl,
buffer,
tb_route(sw),
0,
space,
offset,
length);
}
static inline int tb_sw_write(struct tb_switch *sw, void *buffer,
enum tb_cfg_space space, u32 offset, u32 length)
{
return tb_cfg_write(sw->tb->ctl,
buffer,
tb_route(sw),
0,
space,
offset,
length);
}
static inline int tb_port_read(struct tb_port *port, void *buffer,
enum tb_cfg_space space, u32 offset, u32 length)
{
return tb_cfg_read(port->sw->tb->ctl,
buffer,
tb_route(port->sw),
port->port,
space,
offset,
length);
}
static inline int tb_port_write(struct tb_port *port, void *buffer,
enum tb_cfg_space space, u32 offset, u32 length)
{
return tb_cfg_write(port->sw->tb->ctl,
buffer,
tb_route(port->sw),
port->port,
space,
offset,
length);
}
#define tb_err(tb, fmt, arg...) dev_err(&(tb)->nhi->pdev->dev, fmt, ## arg)
#define tb_WARN(tb, fmt, arg...) dev_WARN(&(tb)->nhi->pdev->dev, fmt, ## arg)
#define tb_warn(tb, fmt, arg...) dev_warn(&(tb)->nhi->pdev->dev, fmt, ## arg)
#define tb_info(tb, fmt, arg...) dev_info(&(tb)->nhi->pdev->dev, fmt, ## arg)
#define __TB_SW_PRINT(level, sw, fmt, arg...) \
do { \
struct tb_switch *__sw = (sw); \
level(__sw->tb, "%llx: " fmt, \
tb_route(__sw), ## arg); \
} while (0)
#define tb_sw_WARN(sw, fmt, arg...) __TB_SW_PRINT(tb_WARN, sw, fmt, ##arg)
#define tb_sw_warn(sw, fmt, arg...) __TB_SW_PRINT(tb_warn, sw, fmt, ##arg)
#define tb_sw_info(sw, fmt, arg...) __TB_SW_PRINT(tb_info, sw, fmt, ##arg)
#define __TB_PORT_PRINT(level, _port, fmt, arg...) \
do { \
struct tb_port *__port = (_port); \
level(__port->sw->tb, "%llx:%x: " fmt, \
tb_route(__port->sw), __port->port, ## arg); \
} while (0)
#define tb_port_WARN(port, fmt, arg...) \
__TB_PORT_PRINT(tb_WARN, port, fmt, ##arg)
#define tb_port_warn(port, fmt, arg...) \
__TB_PORT_PRINT(tb_warn, port, fmt, ##arg)
#define tb_port_info(port, fmt, arg...) \
__TB_PORT_PRINT(tb_info, port, fmt, ##arg)
struct tb *thunderbolt_alloc_and_start(struct tb_nhi *nhi);
void thunderbolt_shutdown_and_free(struct tb *tb);
void thunderbolt_suspend(struct tb *tb);
void thunderbolt_resume(struct tb *tb);
struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route);
void tb_switch_free(struct tb_switch *sw);
void tb_switch_suspend(struct tb_switch *sw);
int tb_switch_resume(struct tb_switch *sw);
int tb_switch_reset(struct tb *tb, u64 route);
void tb_sw_set_unplugged(struct tb_switch *sw);
struct tb_switch *get_switch_at_route(struct tb_switch *sw, u64 route);
int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged);
int tb_port_add_nfc_credits(struct tb_port *port, int credits);
int tb_port_clear_counter(struct tb_port *port, int counter);
int tb_find_cap(struct tb_port *port, enum tb_cfg_space space, enum tb_cap cap);
struct tb_path *tb_path_alloc(struct tb *tb, int num_hops);
void tb_path_free(struct tb_path *path);
int tb_path_activate(struct tb_path *path);
void tb_path_deactivate(struct tb_path *path);
bool tb_path_is_invalid(struct tb_path *path);
int tb_drom_read(struct tb_switch *sw);
int tb_drom_read_uid_only(struct tb_switch *sw, u64 *uid);
static inline int tb_route_length(u64 route)
{
return (fls64(route) + TB_ROUTE_SHIFT - 1) / TB_ROUTE_SHIFT;
}
static inline bool tb_is_upstream_port(struct tb_port *port)
{
return port == tb_upstream_port(port->sw);
}
/**
* tb_downstream_route() - get route to downstream switch
*
* Port must not be the upstream port (otherwise a loop is created).
*
* Return: Returns a route to the switch behind @port.
*/
static inline u64 tb_downstream_route(struct tb_port *port)
{
return tb_route(port->sw)
| ((u64) port->port << (port->sw->config.depth * 8));
}
#endif
