Initial import

1 files changed, 271 insertions, 0 deletions

diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
new file mode 100644
index 000000000..8b0d7cf2b
--- /dev/null
+++ b/drivers/thunderbolt/tb.h
@@ -0,0 +1,271 @@
+/*
+ * 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_unpplugged(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