thunderbolt: Initialize root switch and ports

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andreas Noever 2014-06-03 22:04:02 +02:00 committed by Greg Kroah-Hartman
parent 7adf60972c
commit a25c8b2fc9
4 changed files with 333 additions and 1 deletions

View File

@ -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

View File

@ -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;
}

View File

@ -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);

View File

@ -7,8 +7,30 @@
#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
*/
@ -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