[PATCH v5 05/15] thunderbolt: Initialize root switch and ports

Andreas Noever
2014-06-03T20:05:00Z

This patch adds the structures tb_switch and tb_port as well as code to
initialize the root switch.

Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
---
drivers/thunderbolt/Makefile | 2 +-
drivers/thunderbolt/switch.c | 186 +++++++++++++++++++++++++++++++++++++++++++
drivers/thunderbolt/tb.c | 8 ++
drivers/thunderbolt/tb.h | 138 ++++++++++++++++++++++++++++++++
4 files changed, 333 insertions(+), 1 deletion(-)
create mode 100644 drivers/thunderbolt/switch.c

diff --git a/drivers/thunderbolt/Makefile b/drivers/thunderbolt/Makefile
index 1f996bb..4ac18d9 100644
--- a/drivers/thunderbolt/Makefile
+++ b/drivers/thunderbolt/Makefile
@@ -1,3 +1,3 @@
obj-${CONFIG_THUNDERBOLT} := thunderbolt.o
-thunderbolt-objs := nhi.o ctl.o tb.o
+thunderbolt-objs := nhi.o ctl.o tb.o switch.o

diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
new file mode 100644
index 0000000..e89121f
--- /dev/null
+++ b/drivers/thunderbolt/switch.c
@@ -0,0 +1,186 @@
+/*
+ * Thunderbolt Cactus Ridge driver - switch/port utility functions
+ *
+ * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
+ */
+
+#include <linux/delay.h>
+
+#include "tb.h"
+
+/* port utility functions */
+
+static const char *tb_port_type(struct tb_regs_port_header *port)
+{
+ switch (port->type >> 16) {
+ case 0:
+ switch ((u8) port->type) {
+ case 0:
+ return "Inactive";
+ case 1:
+ return "Port";
+ case 2:
+ return "NHI";
+ default:
+ return "unknown";
+ }
+ case 0x2:
+ return "Ethernet";
+ case 0x8:
+ return "SATA";
+ case 0xe:
+ return "DP/HDMI";
+ case 0x10:
+ return "PCIe";
+ case 0x20:
+ return "USB";
+ default:
+ return "unknown";
+ }
+}
+
+static void tb_dump_port(struct tb *tb, struct tb_regs_port_header *port)
+{
+ tb_info(tb,
+ " Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n",
+ port->port_number, port->vendor_id, port->device_id,
+ port->revision, port->thunderbolt_version, tb_port_type(port),
+ port->type);
+ tb_info(tb, " Max hop id (in/out): %d/%d\n",
+ port->max_in_hop_id, port->max_out_hop_id);
+ tb_info(tb, " Max counters: %d\n", port->max_counters);
+ tb_info(tb, " NFC Credits: %#x\n", port->nfc_credits);
+}
+
+/**
+ * tb_init_port() - initialize a port
+ *
+ * This is a helper method for tb_switch_alloc. Does not check or initialize
+ * any downstream switches.
+ *
+ * Return: Returns 0 on success or an error code on failure.
+ */
+static int tb_init_port(struct tb_switch *sw, u8 port_nr)
+{
+ int res;
+ struct tb_port *port = &sw->ports[port_nr];
+ port->sw = sw;
+ port->port = port_nr;
+ port->remote = NULL;
+ res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
+ if (res)
+ return res;
+
+ tb_dump_port(sw->tb, &port->config);
+
+ /* TODO: Read dual link port, DP port and more from EEPROM. */
+ return 0;
+
+}
+
+/* switch utility functions */
+
+static void tb_dump_switch(struct tb *tb, struct tb_regs_switch_header *sw)
+{
+ tb_info(tb,
+ " Switch: %x:%x (Revision: %d, TB Version: %d)\n",
+ sw->vendor_id, sw->device_id, sw->revision,
+ sw->thunderbolt_version);
+ tb_info(tb, " Max Port Number: %d\n", sw->max_port_number);
+ tb_info(tb, " Config:\n");
+ tb_info(tb,
+ " Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
+ sw->upstream_port_number, sw->depth,
+ (((u64) sw->route_hi) << 32) | sw->route_lo,
+ sw->enabled, sw->plug_events_delay);
+ tb_info(tb,
+ " unknown1: %#x unknown4: %#x\n",
+ sw->__unknown1, sw->__unknown4);
+}
+
+/**
+ * tb_switch_free() - free a tb_switch and all downstream switches
+ */
+void tb_switch_free(struct tb_switch *sw)
+{
+ int i;
+ /* port 0 is the switch itself and never has a remote */
+ for (i = 1; i <= sw->config.max_port_number; i++) {
+ if (tb_is_upstream_port(&sw->ports[i]))
+ continue;
+ if (sw->ports[i].remote)
+ tb_switch_free(sw->ports[i].remote->sw);
+ sw->ports[i].remote = NULL;
+ }
+
+ kfree(sw->ports);
+ kfree(sw);
+}
+
+/**
+ * tb_switch_alloc() - allocate and initialize a switch
+ *
+ * Return: Returns a NULL on failure.
+ */
+struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route)
+{
+ int i;
+ struct tb_switch *sw;
+ int upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);
+ if (upstream_port < 0)
+ return NULL;
+
+ sw = kzalloc(sizeof(*sw), GFP_KERNEL);
+ if (!sw)
+ return NULL;
+
+ sw->tb = tb;
+ if (tb_cfg_read(tb->ctl, &sw->config, route, 0, 2, 0, 5))
+ goto err;
+ tb_info(tb,
+ "initializing Switch at %#llx (depth: %d, up port: %d)\n",
+ route, tb_route_length(route), upstream_port);
+ tb_info(tb, "old switch config:\n");
+ tb_dump_switch(tb, &sw->config);
+
+ /* configure switch */
+ sw->config.upstream_port_number = upstream_port;
+ sw->config.depth = tb_route_length(route);
+ sw->config.route_lo = route;
+ sw->config.route_hi = route >> 32;
+ sw->config.enabled = 1;
+ /* from here on we may use the tb_sw_* functions & macros */
+
+ if (sw->config.vendor_id != 0x8086)
+ tb_sw_warn(sw, "unknown switch vendor id %#x\n",
+ sw->config.vendor_id);
+
+ if (sw->config.device_id != 0x1547 && sw->config.device_id != 0x1549)
+ tb_sw_warn(sw, "unsupported switch device id %#x\n",
+ sw->config.device_id);
+
+ /* upload configuration */
+ if (tb_sw_write(sw, 1 + (u32 *) &sw->config, TB_CFG_SWITCH, 1, 3))
+ goto err;
+
+ /* initialize ports */
+ sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),
+ GFP_KERNEL);
+ if (!sw->ports)
+ goto err;
+
+ for (i = 0; i <= sw->config.max_port_number; i++) {
+ if (tb_init_port(sw, i))
+ goto err;
+ /* TODO: check if port is disabled (EEPROM) */
+ }
+
+ /* TODO: I2C, IECS, EEPROM, link controller */
+
+ return sw;
+err:
+ kfree(sw->ports);
+ kfree(sw);
+ return NULL;
+}
+
diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index 164dea0..f1b6100 100644
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -71,6 +71,10 @@ void thunderbolt_shutdown_and_free(struct tb *tb)
{
mutex_lock(&tb->lock);

+ if (tb->root_switch)
+ tb_switch_free(tb->root_switch);
+ tb->root_switch = NULL;
+
if (tb->ctl) {
tb_ctl_stop(tb->ctl);
tb_ctl_free(tb->ctl);
@@ -126,6 +130,10 @@ struct tb *thunderbolt_alloc_and_start(struct tb_nhi *nhi)
*/
tb_ctl_start(tb->ctl);

+ tb->root_switch = tb_switch_alloc(tb, 0);
+ if (!tb->root_switch)
+ goto err_locked;
+
/* Allow tb_handle_hotplug to progress events */
tb->hotplug_active = true;
mutex_unlock(&tb->lock);
diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
index 6055dfd..389dbb4 100644
--- a/drivers/thunderbolt/tb.h
+++ b/drivers/thunderbolt/tb.h
@@ -7,9 +7,31 @@
#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;
+};
+
+/**
+ * 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 */
+ u8 port; /* port number on switch */
+};
+
+/**
* struct tb - main thunderbolt bus structure
*/
struct tb {
@@ -20,6 +42,7 @@ struct tb {
struct tb_nhi *nhi;
struct tb_ctl *ctl;
struct workqueue_struct *wq; /* ordered workqueue for plug events */
+ struct tb_switch *root_switch;
bool hotplug_active; /*
* tb_handle_hotplug will stop progressing plug
* events and exit if this is not set (it needs to
@@ -29,7 +52,122 @@ struct tb {

};

+/* 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);

+struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route);
+void tb_switch_free(struct tb_switch *sw);
+
+
+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);
+}
+
#endif
--
2.0.0