| /* Copyright (c) 2013 The Chromium OS Authors. All rights reserved. |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| /* Hardware timer driver API */ |
| |
| #ifndef __CROS_EC_HWTIMER_H |
| #define __CROS_EC_HWTIMER_H |
| |
| /** |
| * Programs when the next timer should fire an interrupt. |
| * deadline: timestamp of the event. |
| */ |
| void __hw_clock_event_set(uint32_t deadline); |
| |
| /* Returns the timestamp of the next programed event */ |
| uint32_t __hw_clock_event_get(void); |
| |
| /* Cancel the next event programed by __hw_clock_event_set */ |
| void __hw_clock_event_clear(void); |
| |
| /* Returns the value of the free-running counter used as clock. */ |
| uint32_t __hw_clock_source_read(void); |
| |
| /* Override the current value of the hardware counter */ |
| void __hw_clock_source_set(uint32_t ts); |
| |
| /** |
| * Enable clock to a timer. |
| * |
| * @param n Timer number to enable/disable |
| * @param enable Enable (!=0) or disable (=0) clock to timer |
| */ |
| void __hw_timer_enable_clock(int n, int enable); |
| |
| /** |
| * Initializes the hardware timer used to provide clock services, using the |
| * specified start timer value. |
| * |
| * It returns the IRQ number of the timer routine. |
| */ |
| int __hw_clock_source_init(uint32_t start_t); |
| |
| /** |
| * Searches the next deadline and program it in the timer hardware. |
| * |
| * overflow: if true, the 32-bit counter as overflowed since the last call. |
| * |
| * This function is exported from the common timers code as an helper for the |
| * hardware timer interrupt routine. |
| */ |
| void process_timers(int overflow); |
| |
| /** |
| * Set up the timer that we will use as a watchdog warning. |
| * |
| * Once this has been set up, we will print a warning shortly before the |
| * real watchdog fires. To avoid this, hwtimer_reset_watchdog() must be |
| * called periodically. |
| * |
| * This is needed since the real watchdog timer (IWDG) does not provide |
| * an interrupt to warn of an impending watchdog reset. |
| */ |
| void hwtimer_setup_watchdog(void); |
| |
| /* Reset the watchdog timer, to avoid the watchdog warning */ |
| void hwtimer_reset_watchdog(void); |
| |
| #endif /* __CROS_EC_HWTIMER_H */ |