linux_old1/drivers/thunderbolt/switch.c

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/*
* Thunderbolt Cactus Ridge driver - switch/port utility functions
*
* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
*/
#include <linux/delay.h>
#include <linux/slab.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_port_state() - get connectedness state of a port
*
* The port must have a TB_CAP_PHY (i.e. it should be a real port).
*
* Return: Returns an enum tb_port_state on success or an error code on failure.
*/
static int tb_port_state(struct tb_port *port)
{
struct tb_cap_phy phy;
int res;
if (port->cap_phy == 0) {
tb_port_WARN(port, "does not have a PHY\n");
return -EINVAL;
}
res = tb_port_read(port, &phy, TB_CFG_PORT, port->cap_phy, 2);
if (res)
return res;
return phy.state;
}
/**
* tb_wait_for_port() - wait for a port to become ready
*
* Wait up to 1 second for a port to reach state TB_PORT_UP. If
* wait_if_unplugged is set then we also wait if the port is in state
* TB_PORT_UNPLUGGED (it takes a while for the device to be registered after
* switch resume). Otherwise we only wait if a device is registered but the link
* has not yet been established.
*
* Return: Returns an error code on failure. Returns 0 if the port is not
* connected or failed to reach state TB_PORT_UP within one second. Returns 1
* if the port is connected and in state TB_PORT_UP.
*/
int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)
{
int retries = 10;
int state;
if (!port->cap_phy) {
tb_port_WARN(port, "does not have PHY\n");
return -EINVAL;
}
if (tb_is_upstream_port(port)) {
tb_port_WARN(port, "is the upstream port\n");
return -EINVAL;
}
while (retries--) {
state = tb_port_state(port);
if (state < 0)
return state;
if (state == TB_PORT_DISABLED) {
tb_port_info(port, "is disabled (state: 0)\n");
return 0;
}
if (state == TB_PORT_UNPLUGGED) {
if (wait_if_unplugged) {
/* used during resume */
tb_port_info(port,
"is unplugged (state: 7), retrying...\n");
msleep(100);
continue;
}
tb_port_info(port, "is unplugged (state: 7)\n");
return 0;
}
if (state == TB_PORT_UP) {
tb_port_info(port,
"is connected, link is up (state: 2)\n");
return 1;
}
/*
* After plug-in the state is TB_PORT_CONNECTING. Give it some
* time.
*/
tb_port_info(port,
"is connected, link is not up (state: %d), retrying...\n",
state);
msleep(100);
}
tb_port_warn(port,
"failed to reach state TB_PORT_UP. Ignoring port...\n");
return 0;
}
/**
* tb_port_add_nfc_credits() - add/remove non flow controlled credits to port
*
* Change the number of NFC credits allocated to @port by @credits. To remove
* NFC credits pass a negative amount of credits.
*
* Return: Returns 0 on success or an error code on failure.
*/
int tb_port_add_nfc_credits(struct tb_port *port, int credits)
{
if (credits == 0)
return 0;
tb_port_info(port,
"adding %#x NFC credits (%#x -> %#x)",
credits,
port->config.nfc_credits,
port->config.nfc_credits + credits);
port->config.nfc_credits += credits;
return tb_port_write(port, &port->config.nfc_credits,
TB_CFG_PORT, 4, 1);
}
/**
* tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER
*
* Return: Returns 0 on success or an error code on failure.
*/
int tb_port_clear_counter(struct tb_port *port, int counter)
{
u32 zero[3] = { 0, 0, 0 };
tb_port_info(port, "clearing counter %d\n", counter);
return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3);
}
/**
* 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_port *port)
{
int res;
int cap;
res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
if (res)
return res;
/* Port 0 is the switch itself and has no PHY. */
if (port->config.type == TB_TYPE_PORT && port->port != 0) {
cap = tb_find_cap(port, TB_CFG_PORT, TB_CAP_PHY);
if (cap > 0)
port->cap_phy = cap;
else
tb_port_WARN(port, "non switch port without a PHY\n");
}
tb_dump_port(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);
}
/**
* reset_switch() - reconfigure route, enable and send TB_CFG_PKG_RESET
*
* Return: Returns 0 on success or an error code on failure.
*/
int tb_switch_reset(struct tb *tb, u64 route)
{
struct tb_cfg_result res;
struct tb_regs_switch_header header = {
header.route_hi = route >> 32,
header.route_lo = route,
header.enabled = true,
};
tb_info(tb, "resetting switch at %llx\n", route);
res.err = tb_cfg_write(tb->ctl, ((u32 *) &header) + 2, route,
0, 2, 2, 2);
if (res.err)
return res.err;
res = tb_cfg_reset(tb->ctl, route, TB_CFG_DEFAULT_TIMEOUT);
if (res.err > 0)
return -EIO;
return res.err;
}
struct tb_switch *get_switch_at_route(struct tb_switch *sw, u64 route)
{
u8 next_port = route; /*
* Routes use a stride of 8 bits,
* eventhough a port index has 6 bits at most.
* */
if (route == 0)
return sw;
if (next_port > sw->config.max_port_number)
return NULL;
if (tb_is_upstream_port(&sw->ports[next_port]))
return NULL;
if (!sw->ports[next_port].remote)
return NULL;
return get_switch_at_route(sw->ports[next_port].remote->sw,
route >> TB_ROUTE_SHIFT);
}
/**
* tb_plug_events_active() - enable/disable plug events on a switch
*
* Also configures a sane plug_events_delay of 255ms.
*
* Return: Returns 0 on success or an error code on failure.
*/
static int tb_plug_events_active(struct tb_switch *sw, bool active)
{
u32 data;
int res;
sw->config.plug_events_delay = 0xff;
res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
if (res)
return res;
res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);
if (res)
return res;
if (active) {
data = data & 0xFFFFFF83;
switch (sw->config.device_id) {
case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
break;
default:
data |= 4;
}
} else {
data = data | 0x7c;
}
return tb_sw_write(sw, &data, TB_CFG_SWITCH,
sw->cap_plug_events + 1, 1);
}
/**
* 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;
}
if (!sw->is_unplugged)
tb_plug_events_active(sw, false);
kfree(sw->ports);
kfree(sw->drom);
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;
int cap;
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, TB_CFG_SWITCH, 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);
thunderbolt: Support 1st gen Light Ridge controller Add support for the 1st gen Light Ridge controller, which is built into these systems: iMac12,1 2011 21.5" iMac12,2 2011 27" Macmini5,1 2011 i5 2.3 GHz Macmini5,2 2011 i5 2.5 GHz Macmini5,3 2011 i7 2.0 GHz MacBookPro8,1 2011 13" MacBookPro8,2 2011 15" MacBookPro8,3 2011 17" MacBookPro9,1 2012 15" MacBookPro9,2 2012 13" Light Ridge (CV82524) was the very first copper Thunderbolt controller, introduced 2010 alongside its fiber-optic cousin Light Peak (CVL2510). Consequently the chip suffers from some teething troubles: - MSI is broken for hotplug signaling on the downstream bridges: The chip just never sends an interrupt. It requests 32 MSIs for each of its six bridges and the pcieport driver only allocates one per bridge. However I've verified that even if 32 MSIs are allocated there's no interrupt on hotplug. The only option is thus to disable MSI, which is also what OS X does. Apparently all Thunderbolt chips up to revision 1 of Cactus Ridge 4C are plagued by this issue so quirk those as well. - The chip supports a maximum hop_count of 32, unlike its successors which support only 12. Fixup ring_interrupt_active() to cope with values >= 32. - Another peculiarity is that the chip supports a maximum of 13 ports whereas its successors support 12. However the additional port (#5) seems to be unusable as reading its TB_CFG_PORT config space results in TB_CFG_ERROR_INVALID_CONFIG_SPACE. Add a quirk to mark the port disabled on the root switch, assuming that's necessary on all Macs using this chip. Tested-by: Lukas Wunner <lukas@wunner.de> [MacBookPro9,1] Tested-by: William Brown <william@blackhats.net.au> [MacBookPro8,2] Signed-off-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Andreas Noever <andreas.noever@gmail.com>
2016-03-20 20:57:20 +08:00
if (sw->config.device_id != PCI_DEVICE_ID_INTEL_LIGHT_RIDGE &&
sw->config.device_id != PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C &&
sw->config.device_id != PCI_DEVICE_ID_INTEL_PORT_RIDGE &&
sw->config.device_id != PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE &&
sw->config.device_id != PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE)
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++) {
/* minimum setup for tb_find_cap and tb_drom_read to work */
sw->ports[i].sw = sw;
sw->ports[i].port = i;
}
cap = tb_find_cap(&sw->ports[0], TB_CFG_SWITCH, TB_CAP_PLUG_EVENTS);
if (cap < 0) {
tb_sw_warn(sw, "cannot find TB_CAP_PLUG_EVENTS aborting\n");
goto err;
}
sw->cap_plug_events = cap;
/* read drom */
if (tb_drom_read(sw))
tb_sw_warn(sw, "tb_eeprom_read_rom failed, continuing\n");
tb_sw_info(sw, "uid: %#llx\n", sw->uid);
for (i = 0; i <= sw->config.max_port_number; i++) {
if (sw->ports[i].disabled) {
tb_port_info(&sw->ports[i], "disabled by eeprom\n");
continue;
}
if (tb_init_port(&sw->ports[i]))
goto err;
}
/* TODO: I2C, IECS, link controller */
if (tb_plug_events_active(sw, true))
goto err;
return sw;
err:
kfree(sw->ports);
kfree(sw->drom);
kfree(sw);
return NULL;
}
/**
* tb_sw_set_unplugged() - set is_unplugged on switch and downstream switches
*/
void tb_sw_set_unplugged(struct tb_switch *sw)
{
int i;
if (sw == sw->tb->root_switch) {
tb_sw_WARN(sw, "cannot unplug root switch\n");
return;
}
if (sw->is_unplugged) {
tb_sw_WARN(sw, "is_unplugged already set\n");
return;
}
sw->is_unplugged = true;
for (i = 0; i <= sw->config.max_port_number; i++) {
if (!tb_is_upstream_port(&sw->ports[i]) && sw->ports[i].remote)
tb_sw_set_unplugged(sw->ports[i].remote->sw);
}
}
int tb_switch_resume(struct tb_switch *sw)
{
int i, err;
u64 uid;
tb_sw_info(sw, "resuming switch\n");
err = tb_drom_read_uid_only(sw, &uid);
if (err) {
tb_sw_warn(sw, "uid read failed\n");
return err;
}
if (sw->uid != uid) {
tb_sw_info(sw,
"changed while suspended (uid %#llx -> %#llx)\n",
sw->uid, uid);
return -ENODEV;
}
/* upload configuration */
err = tb_sw_write(sw, 1 + (u32 *) &sw->config, TB_CFG_SWITCH, 1, 3);
if (err)
return err;
err = tb_plug_events_active(sw, true);
if (err)
return err;
/* check for surviving downstream switches */
for (i = 1; i <= sw->config.max_port_number; i++) {
struct tb_port *port = &sw->ports[i];
if (tb_is_upstream_port(port))
continue;
if (!port->remote)
continue;
if (tb_wait_for_port(port, true) <= 0
|| tb_switch_resume(port->remote->sw)) {
tb_port_warn(port,
"lost during suspend, disconnecting\n");
tb_sw_set_unplugged(port->remote->sw);
}
}
return 0;
}
void tb_switch_suspend(struct tb_switch *sw)
{
int i, err;
err = tb_plug_events_active(sw, false);
if (err)
return;
for (i = 1; i <= sw->config.max_port_number; i++) {
if (!tb_is_upstream_port(&sw->ports[i]) && sw->ports[i].remote)
tb_switch_suspend(sw->ports[i].remote->sw);
}
/*
* TODO: invoke tb_cfg_prepare_to_sleep here? does not seem to have any
* effect?
*/
}