Release 4.9 drivers/staging/greybus/timesync_platform.c
/*
* TimeSync API driver.
*
* Copyright 2016 Google Inc.
* Copyright 2016 Linaro Ltd.
*
* Released under the GPLv2 only.
*
* This code reads directly from an ARMv7 memory-mapped timer that lives in
* MMIO space. Since this counter lives inside of MMIO space its shared between
* cores and that means we don't have to worry about issues like TSC on x86
* where each time-stamp-counter (TSC) is local to a particular core.
*
* Register-level access code is based on
* drivers/clocksource/arm_arch_timer.c
*/
#include <linux/cpufreq.h>
#include <linux/of_platform.h>
#include "greybus.h"
#include "arche_platform.h"
#define DEFAULT_FRAMETIME_CLOCK_HZ 19200000
static u32 gb_timesync_clock_frequency;
int (*arche_platform_change_state_cb)(enum arche_platform_state state,
struct gb_timesync_svc *pdata);
EXPORT_SYMBOL_GPL(arche_platform_change_state_cb);
u64 gb_timesync_platform_get_counter(void)
{
return (u64)get_cycles();
}
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u32 gb_timesync_platform_get_clock_rate(void)
{
if (unlikely(!gb_timesync_clock_frequency)) {
gb_timesync_clock_frequency = cpufreq_get(0);
if (!gb_timesync_clock_frequency)
gb_timesync_clock_frequency = DEFAULT_FRAMETIME_CLOCK_HZ;
}
return gb_timesync_clock_frequency;
}
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int gb_timesync_platform_lock_bus(struct gb_timesync_svc *pdata)
{
return arche_platform_change_state_cb(ARCHE_PLATFORM_STATE_TIME_SYNC,
pdata);
}
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void gb_timesync_platform_unlock_bus(void)
{
arche_platform_change_state_cb(ARCHE_PLATFORM_STATE_ACTIVE, NULL);
}
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static const struct of_device_id arch_timer_of_match[] = {
{ .compatible = "google,greybus-frame-time-counter", },
{},
};
int __init gb_timesync_platform_init(void)
{
struct device_node *np;
np = of_find_matching_node(NULL, arch_timer_of_match);
if (!np) {
/* Tolerate not finding to allow BBB etc to continue */
pr_warn("Unable to find a compatible ARMv7 timer\n");
return 0;
}
if (of_property_read_u32(np, "clock-frequency",
&gb_timesync_clock_frequency)) {
pr_err("Unable to find timer clock-frequency\n");
return -ENODEV;
}
return 0;
}
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void gb_timesync_platform_exit(void) {}
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| Total | 212 | 100.00% | 2 | 100.00% |