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/* Copyright 2020 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* High-priority interrupt tasks implementations */
#include "builtin/assert.h"
#include "common.h"
#include "compile_time_macros.h"
#include "console.h"
#include "ec_commands.h"
#include "task.h"
#include "tcpm/tcpm.h"
#include "timer.h"
#include "usb_pd.h"
#include "usb_pd_tcpm.h"
#include <stdint.h>
#define CPRINTF(format, args...) cprintf(CC_USBPD, format, ##args)
#define CPRINTS(format, args...) cprints(CC_USBPD, format, ##args)
/* Events for pd_interrupt_handler_task */
#define PD_PROCESS_INTERRUPT BIT(0)
/*
* Theoretically, we may need to support up to 1800 USB-PD packets per second
* for intensive operations such as BIST compliance tests. This value has tested
* well preventing watchdog resets with a single bad port partner plugged in.
*/
#define ALERT_STORM_MAX_COUNT 1800
#define ALERT_STORM_INTERVAL SECOND
static uint8_t pd_int_task_id[CONFIG_USB_PD_PORT_MAX_COUNT];
void schedule_deferred_pd_interrupt(const int port)
{
/*
* Don't set event to idle task if task id is 0. This happens when
* not all the port have pd int task, the pd_int_task_id of port
* that doesn't have pd int task is 0.
*/
if (pd_int_task_id[port] != 0)
task_set_event(pd_int_task_id[port], PD_PROCESS_INTERRUPT);
}
static struct {
int count;
timestamp_t time;
} storm_tracker[CONFIG_USB_PD_PORT_MAX_COUNT];
static void service_one_port(int port)
{
timestamp_t now;
tcpc_alert(port);
now = get_time();
if (timestamp_expired(storm_tracker[port].time, &now)) {
/* Reset timer into future */
storm_tracker[port].time.val = now.val + ALERT_STORM_INTERVAL;
/*
* Start at 1 since we are processing an interrupt right
* now
*/
storm_tracker[port].count = 1;
} else if (++storm_tracker[port].count > ALERT_STORM_MAX_COUNT) {
CPRINTS("C%d: Interrupt storm detected."
" Disabling port temporarily",
port);
pd_set_suspend(port, 1);
pd_deferred_resume(port);
}
}
__overridable void board_process_pd_alert(int port)
{
}
/*
* Main task entry point that handles PD interrupts for a single port. These
* interrupts usually come from a TCPC, but may also come from PD-related chips
* sharing the TCPC interrupt line.
*
* @param p The PD port number for which to handle interrupts (pointer is
* reinterpreted as an integer directly).
*/
void pd_interrupt_handler_task(void *p)
{
const int port = (int)((intptr_t)p);
const int port_mask = (PD_STATUS_TCPC_ALERT_0 << port);
ASSERT(port >= 0 && port < CONFIG_USB_PD_PORT_MAX_COUNT);
/*
* If port does not exist, return
*/
if (port >= board_get_usb_pd_port_count())
return;
pd_int_task_id[port] = task_get_current();
while (1) {
const int evt = task_wait_event(-1);
if ((evt & PD_PROCESS_INTERRUPT) == 0)
continue;
/*
* While the interrupt signal is asserted; we have more
* work to do. This effectively makes the interrupt a
* level-interrupt instead of an edge-interrupt without
* having to enable/disable a real level-interrupt in
* multiple locations.
*
* Also, if the port is disabled do not process
* interrupts. Upon existing suspend, we schedule a
* PD_PROCESS_INTERRUPT to check if we missed anything.
*/
while ((tcpc_get_alert_status() & port_mask) &&
pd_is_port_enabled(port)) {
service_one_port(port);
}
board_process_pd_alert(port);
}
}
/*
* This code assumes port alert masks are adjacent to each other.
*/
BUILD_ASSERT(PD_STATUS_TCPC_ALERT_3 == (PD_STATUS_TCPC_ALERT_0 << 3));
/*
* Shared TCPC interrupt handler. The function argument in ec.tasklist
* is the mask of ports to handle. For example:
*
* BIT(USBC_PORT_C2) | BIT(USBC_PORT_C0)
*
* Note that this bitmask is 0-based while PD_STATUS_TCPC_ALERT_<port>
* is not.
*/
#if !defined(CONFIG_ZEPHYR) || defined(CONFIG_HAS_TASK_PD_INT_SHARED)
void pd_shared_alert_task(void *p)
{
const int sources_mask = (int)((intptr_t)p);
int want_alerts = 0;
int port;
int port_mask;
CPRINTS("%s: port mask 0x%02x", __func__, sources_mask);
for (port = 0; port < CONFIG_USB_PD_PORT_MAX_COUNT; ++port) {
if ((sources_mask & BIT(port)) == 0)
continue;
if (!board_is_usb_pd_port_present(port))
continue;
port_mask = PD_STATUS_TCPC_ALERT_0 << port;
want_alerts |= port_mask;
pd_int_task_id[port] = task_get_current();
}
if (want_alerts == 0) {
/*
* None of the configured alert sources are available.
*/
return;
}
while (1) {
const int evt = task_wait_event(-1);
int have_alerts;
if ((evt & PD_PROCESS_INTERRUPT) == 0)
continue;
/*
* While the interrupt signal is asserted; we have more
* work to do. This effectively makes the interrupt a
* level-interrupt instead of an edge-interrupt without
* having to enable/disable a real level-interrupt in
* multiple locations.
*
* Also, if the port is disabled do not process
* interrupts. Upon existing suspend, we schedule a
* PD_PROCESS_INTERRUPT to check if we missed anything.
*/
do {
have_alerts = tcpc_get_alert_status();
have_alerts &= want_alerts;
for (port = 0; port < CONFIG_USB_PD_PORT_MAX_COUNT;
++port) {
port_mask = PD_STATUS_TCPC_ALERT_0 << port;
if ((have_alerts & port_mask) == 0) {
/* skip quiet port */
continue;
}
if (!pd_is_port_enabled(port)) {
/* filter out disabled port */
have_alerts &= ~port_mask;
continue;
}
service_one_port(port);
}
} while (have_alerts != 0);
}
}
#endif /* !CONFIG_ZEPHYR || CONFIG_HAS_TASK_PD_INT_SHARED */
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