2020-04-17 18:54:28 +03:00
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/*
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* Hardware Clocks
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*
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* Copyright GreenSocs 2016-2020
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*
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* Authors:
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* Frederic Konrad
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* Damien Hedde
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef QEMU_HW_CLOCK_H
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#define QEMU_HW_CLOCK_H
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#include "qom/object.h"
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#include "qemu/queue.h"
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#define TYPE_CLOCK "clock"
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#define CLOCK(obj) OBJECT_CHECK(Clock, (obj), TYPE_CLOCK)
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typedef void ClockCallback(void *opaque);
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/*
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* clock store a value representing the clock's period in 2^-32ns unit.
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* It can represent:
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* + periods from 2^-32ns up to 4seconds
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* + frequency from ~0.25Hz 2e10Ghz
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* Resolution of frequency representation decreases with frequency:
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* + at 100MHz, resolution is ~2mHz
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* + at 1Ghz, resolution is ~0.2Hz
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* + at 10Ghz, resolution is ~20Hz
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*/
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#define CLOCK_PERIOD_1SEC (1000000000llu << 32)
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/*
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* macro helpers to convert to hertz / nanosecond
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*/
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#define CLOCK_PERIOD_FROM_NS(ns) ((ns) * (CLOCK_PERIOD_1SEC / 1000000000llu))
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#define CLOCK_PERIOD_TO_NS(per) ((per) / (CLOCK_PERIOD_1SEC / 1000000000llu))
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#define CLOCK_PERIOD_FROM_HZ(hz) (((hz) != 0) ? CLOCK_PERIOD_1SEC / (hz) : 0u)
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#define CLOCK_PERIOD_TO_HZ(per) (((per) != 0) ? CLOCK_PERIOD_1SEC / (per) : 0u)
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/**
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* Clock:
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* @parent_obj: parent class
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* @period: unsigned integer representing the period of the clock
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* @canonical_path: clock path string cache (used for trace purpose)
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* @callback: called when clock changes
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* @callback_opaque: argument for @callback
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* @source: source (or parent in clock tree) of the clock
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* @children: list of clocks connected to this one (it is their source)
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* @sibling: structure used to form a clock list
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*/
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typedef struct Clock Clock;
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struct Clock {
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/*< private >*/
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Object parent_obj;
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/* all fields are private and should not be modified directly */
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/* fields */
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uint64_t period;
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char *canonical_path;
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ClockCallback *callback;
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void *callback_opaque;
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/* Clocks are organized in a clock tree */
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Clock *source;
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QLIST_HEAD(, Clock) children;
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QLIST_ENTRY(Clock) sibling;
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};
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2020-04-06 16:52:44 +03:00
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/*
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* vmstate description entry to be added in device vmsd.
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*/
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extern const VMStateDescription vmstate_clock;
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#define VMSTATE_CLOCK(field, state) \
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VMSTATE_CLOCK_V(field, state, 0)
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#define VMSTATE_CLOCK_V(field, state, version) \
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VMSTATE_STRUCT_POINTER_V(field, state, version, vmstate_clock, Clock)
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2020-04-17 18:54:28 +03:00
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/**
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* clock_setup_canonical_path:
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* @clk: clock
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*
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* compute the canonical path of the clock (used by log messages)
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*/
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void clock_setup_canonical_path(Clock *clk);
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/**
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* clock_set_callback:
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* @clk: the clock to register the callback into
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* @cb: the callback function
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* @opaque: the argument to the callback
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*
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* Register a callback called on every clock update.
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*/
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void clock_set_callback(Clock *clk, ClockCallback *cb, void *opaque);
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/**
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* clock_clear_callback:
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* @clk: the clock to delete the callback from
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*
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* Unregister the callback registered with clock_set_callback.
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*/
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void clock_clear_callback(Clock *clk);
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/**
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* clock_set_source:
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* @clk: the clock.
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* @src: the source clock
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*
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* Setup @src as the clock source of @clk. The current @src period
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* value is also copied to @clk and its subtree but no callback is
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* called.
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* Further @src update will be propagated to @clk and its subtree.
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*/
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void clock_set_source(Clock *clk, Clock *src);
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/**
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* clock_set:
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* @clk: the clock to initialize.
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* @value: the clock's value, 0 means unclocked
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*
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* Set the local cached period value of @clk to @value.
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2020-08-28 12:02:44 +03:00
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*
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* @return: true if the clock is changed.
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2020-04-17 18:54:28 +03:00
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*/
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2020-08-28 12:02:44 +03:00
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bool clock_set(Clock *clk, uint64_t value);
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2020-04-17 18:54:28 +03:00
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2020-08-28 12:02:44 +03:00
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static inline bool clock_set_hz(Clock *clk, unsigned hz)
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2020-04-17 18:54:28 +03:00
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{
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2020-08-28 12:02:44 +03:00
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return clock_set(clk, CLOCK_PERIOD_FROM_HZ(hz));
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2020-04-17 18:54:28 +03:00
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}
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2020-08-28 12:02:44 +03:00
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static inline bool clock_set_ns(Clock *clk, unsigned ns)
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2020-04-17 18:54:28 +03:00
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{
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2020-08-28 12:02:44 +03:00
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return clock_set(clk, CLOCK_PERIOD_FROM_NS(ns));
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2020-04-17 18:54:28 +03:00
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}
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/**
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* clock_propagate:
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* @clk: the clock
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*
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* Propagate the clock period that has been previously configured using
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* @clock_set(). This will update recursively all connected clocks.
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* It is an error to call this function on a clock which has a source.
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* Note: this function must not be called during device inititialization
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* or migration.
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*/
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void clock_propagate(Clock *clk);
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/**
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* clock_update:
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* @clk: the clock to update.
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* @value: the new clock's value, 0 means unclocked
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*
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* Update the @clk to the new @value. All connected clocks will be informed
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* of this update. This is equivalent to call @clock_set() then
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* @clock_propagate().
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*/
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static inline void clock_update(Clock *clk, uint64_t value)
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{
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2020-08-28 12:02:44 +03:00
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if (clock_set(clk, value)) {
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clock_propagate(clk);
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}
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2020-04-17 18:54:28 +03:00
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}
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static inline void clock_update_hz(Clock *clk, unsigned hz)
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{
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clock_update(clk, CLOCK_PERIOD_FROM_HZ(hz));
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}
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static inline void clock_update_ns(Clock *clk, unsigned ns)
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{
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clock_update(clk, CLOCK_PERIOD_FROM_NS(ns));
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}
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/**
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* clock_get:
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* @clk: the clk to fetch the clock
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*
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* @return: the current period.
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*/
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static inline uint64_t clock_get(const Clock *clk)
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{
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return clk->period;
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}
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static inline unsigned clock_get_hz(Clock *clk)
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{
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return CLOCK_PERIOD_TO_HZ(clock_get(clk));
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}
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static inline unsigned clock_get_ns(Clock *clk)
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{
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return CLOCK_PERIOD_TO_NS(clock_get(clk));
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}
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/**
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* clock_is_enabled:
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* @clk: a clock
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*
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* @return: true if the clock is running.
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*/
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static inline bool clock_is_enabled(const Clock *clk)
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{
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return clock_get(clk) != 0;
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}
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#endif /* QEMU_HW_CLOCK_H */
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