* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
*/
+#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/pci.h>
return IRQ_HANDLED;
}
+static int nhi_suspend_noirq(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct tb *tb = pci_get_drvdata(pdev);
+ thunderbolt_suspend(tb);
+ return 0;
+}
+
+static int nhi_resume_noirq(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct tb *tb = pci_get_drvdata(pdev);
+ thunderbolt_resume(tb);
+ return 0;
+}
+
static void nhi_shutdown(struct tb_nhi *nhi)
{
int i;
nhi_shutdown(nhi);
}
+/*
+ * The tunneled pci bridges are siblings of us. Use resume_noirq to reenable
+ * the tunnels asap. A corresponding pci quirk blocks the downstream bridges
+ * resume_noirq until we are done.
+ */
+static const struct dev_pm_ops nhi_pm_ops = {
+ .suspend_noirq = nhi_suspend_noirq,
+ .resume_noirq = nhi_resume_noirq,
+ .freeze_noirq = nhi_suspend_noirq, /*
+ * we just disable hotplug, the
+ * pci-tunnels stay alive.
+ */
+ .restore_noirq = nhi_resume_noirq,
+};
+
struct pci_device_id nhi_ids[] = {
/*
* We have to specify class, the TB bridges use the same device and
.id_table = nhi_ids,
.probe = nhi_probe,
.remove = nhi_remove,
+ .driver.pm = &nhi_pm_ops,
};
static int __init nhi_init(void)
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; /*
}
}
+int tb_switch_resume(struct tb_switch *sw)
+{
+ int i, err;
+ u64 uid;
+ tb_sw_info(sw, "resuming switch\n");
+
+ err = tb_eeprom_read_uid(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_unpplugged(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?
+ */
+}
}
/**
+ * tb_free_unplugged_children() - traverse hierarchy and free unplugged switches
+ */
+static void tb_free_unplugged_children(struct tb_switch *sw)
+{
+ int i;
+ 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 (port->remote->sw->is_unplugged) {
+ tb_switch_free(port->remote->sw);
+ port->remote = NULL;
+ } else {
+ tb_free_unplugged_children(port->remote->sw);
+ }
+ }
+}
+
+
+/**
* find_pci_up_port() - return the first PCIe up port on @sw or NULL
*/
static struct tb_port *tb_find_pci_up_port(struct tb_switch *sw)
return NULL;
}
+void thunderbolt_suspend(struct tb *tb)
+{
+ tb_info(tb, "suspending...\n");
+ mutex_lock(&tb->lock);
+ tb_switch_suspend(tb->root_switch);
+ tb_ctl_stop(tb->ctl);
+ tb->hotplug_active = false; /* signal tb_handle_hotplug to quit */
+ mutex_unlock(&tb->lock);
+ tb_info(tb, "suspend finished\n");
+}
+
+void thunderbolt_resume(struct tb *tb)
+{
+ struct tb_pci_tunnel *tunnel, *n;
+ tb_info(tb, "resuming...\n");
+ mutex_lock(&tb->lock);
+ tb_ctl_start(tb->ctl);
+
+ /* remove any pci devices the firmware might have setup */
+ tb_switch_reset(tb, 0);
+
+ tb_switch_resume(tb->root_switch);
+ tb_free_invalid_tunnels(tb);
+ tb_free_unplugged_children(tb->root_switch);
+ list_for_each_entry_safe(tunnel, n, &tb->tunnel_list, list)
+ tb_pci_restart(tunnel);
+ if (!list_empty(&tb->tunnel_list)) {
+ /*
+ * the pcie links need some time to get going.
+ * 100ms works for me...
+ */
+ tb_info(tb, "tunnels restarted, sleeping for 100ms\n");
+ msleep(100);
+ }
+ /* Allow tb_handle_hotplug to progress events */
+ tb->hotplug_active = true;
+ mutex_unlock(&tb->lock);
+ tb_info(tb, "resume finished\n");
+}
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);
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