1348 lines
37 KiB
C
1348 lines
37 KiB
C
/*
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* TimeSync API driver.
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*
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* Copyright 2016 Google Inc.
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* Copyright 2016 Linaro Ltd.
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*
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* Released under the GPLv2 only.
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*/
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#include <linux/debugfs.h>
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#include <linux/hrtimer.h>
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#include "greybus.h"
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#include "timesync.h"
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#include "greybus_trace.h"
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/*
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* Minimum inter-strobe value of one millisecond is chosen because it
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* just-about fits the common definition of a jiffy.
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*
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* Maximum value OTOH is constrained by the number of bits the SVC can fit
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* into a 16 bit up-counter. The SVC configures the timer in microseconds
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* so the maximum allowable value is 65535 microseconds. We clip that value
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* to 10000 microseconds for the sake of using nice round base 10 numbers
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* and since right-now there's no imaginable use-case requiring anything
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* other than a one millisecond inter-strobe time, let alone something
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* higher than ten milliseconds.
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*/
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#define GB_TIMESYNC_STROBE_DELAY_US 1000
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#define GB_TIMESYNC_DEFAULT_OFFSET_US 1000
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/* Work queue timers long, short and SVC strobe timeout */
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#define GB_TIMESYNC_DELAYED_WORK_LONG msecs_to_jiffies(10)
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#define GB_TIMESYNC_DELAYED_WORK_SHORT msecs_to_jiffies(1)
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#define GB_TIMESYNC_MAX_WAIT_SVC msecs_to_jiffies(5000)
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#define GB_TIMESYNC_KTIME_UPDATE msecs_to_jiffies(1000)
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#define GB_TIMESYNC_MAX_KTIME_CONVERSION 15
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/* Reported nanoseconds/femtoseconds per clock */
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static u64 gb_timesync_ns_per_clock;
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static u64 gb_timesync_fs_per_clock;
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/* Maximum difference we will accept converting FrameTime to ktime */
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static u32 gb_timesync_max_ktime_diff;
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/* Reported clock rate */
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static unsigned long gb_timesync_clock_rate;
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/* Workqueue */
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static void gb_timesync_worker(struct work_struct *work);
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/* List of SVCs with one FrameTime per SVC */
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static LIST_HEAD(gb_timesync_svc_list);
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/* Synchronize parallel contexts accessing a valid timesync_svc pointer */
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static DEFINE_MUTEX(gb_timesync_svc_list_mutex);
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/* Structure to convert from FrameTime to timespec/ktime */
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struct gb_timesync_frame_time_data {
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u64 frame_time;
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struct timespec ts;
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};
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struct gb_timesync_svc {
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struct list_head list;
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struct list_head interface_list;
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struct gb_svc *svc;
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struct gb_timesync_host_device *timesync_hd;
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spinlock_t spinlock; /* Per SVC spinlock to sync with ISR */
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struct mutex mutex; /* Per SVC mutex for regular synchronization */
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struct dentry *frame_time_dentry;
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struct dentry *frame_ktime_dentry;
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struct workqueue_struct *work_queue;
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wait_queue_head_t wait_queue;
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struct delayed_work delayed_work;
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struct timer_list ktime_timer;
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/* The current local FrameTime */
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u64 frame_time_offset;
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struct gb_timesync_frame_time_data strobe_data[GB_TIMESYNC_MAX_STROBES];
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struct gb_timesync_frame_time_data ktime_data;
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/* The SVC FrameTime and relative AP FrameTime @ last TIMESYNC_PING */
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u64 svc_ping_frame_time;
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u64 ap_ping_frame_time;
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/* Transitory settings */
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u32 strobe_mask;
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bool offset_down;
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bool print_ping;
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bool capture_ping;
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int strobe;
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/* Current state */
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int state;
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};
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struct gb_timesync_host_device {
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struct list_head list;
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struct gb_host_device *hd;
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u64 ping_frame_time;
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};
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struct gb_timesync_interface {
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struct list_head list;
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struct gb_interface *interface;
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u64 ping_frame_time;
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};
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enum gb_timesync_state {
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GB_TIMESYNC_STATE_INVALID = 0,
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GB_TIMESYNC_STATE_INACTIVE = 1,
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GB_TIMESYNC_STATE_INIT = 2,
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GB_TIMESYNC_STATE_WAIT_SVC = 3,
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GB_TIMESYNC_STATE_AUTHORITATIVE = 4,
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GB_TIMESYNC_STATE_PING = 5,
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GB_TIMESYNC_STATE_ACTIVE = 6,
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};
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static void gb_timesync_ktime_timer_fn(unsigned long data);
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static u64 gb_timesync_adjust_count(struct gb_timesync_svc *timesync_svc,
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u64 counts)
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{
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if (timesync_svc->offset_down)
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return counts - timesync_svc->frame_time_offset;
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else
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return counts + timesync_svc->frame_time_offset;
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}
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/*
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* This function provides the authoritative FrameTime to a calling function. It
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* is designed to be lockless and should remain that way the caller is assumed
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* to be state-aware.
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*/
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static u64 __gb_timesync_get_frame_time(struct gb_timesync_svc *timesync_svc)
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{
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u64 clocks = gb_timesync_platform_get_counter();
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return gb_timesync_adjust_count(timesync_svc, clocks);
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}
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static void gb_timesync_schedule_svc_timeout(struct gb_timesync_svc
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*timesync_svc)
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{
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queue_delayed_work(timesync_svc->work_queue,
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×ync_svc->delayed_work,
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GB_TIMESYNC_MAX_WAIT_SVC);
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}
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static void gb_timesync_set_state(struct gb_timesync_svc *timesync_svc,
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int state)
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{
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switch (state) {
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case GB_TIMESYNC_STATE_INVALID:
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timesync_svc->state = state;
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wake_up(×ync_svc->wait_queue);
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break;
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case GB_TIMESYNC_STATE_INACTIVE:
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timesync_svc->state = state;
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wake_up(×ync_svc->wait_queue);
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break;
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case GB_TIMESYNC_STATE_INIT:
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if (timesync_svc->state != GB_TIMESYNC_STATE_INVALID) {
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timesync_svc->strobe = 0;
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timesync_svc->frame_time_offset = 0;
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timesync_svc->state = state;
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cancel_delayed_work(×ync_svc->delayed_work);
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queue_delayed_work(timesync_svc->work_queue,
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×ync_svc->delayed_work,
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GB_TIMESYNC_DELAYED_WORK_LONG);
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}
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break;
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case GB_TIMESYNC_STATE_WAIT_SVC:
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if (timesync_svc->state == GB_TIMESYNC_STATE_INIT)
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timesync_svc->state = state;
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break;
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case GB_TIMESYNC_STATE_AUTHORITATIVE:
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if (timesync_svc->state == GB_TIMESYNC_STATE_WAIT_SVC) {
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timesync_svc->state = state;
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cancel_delayed_work(×ync_svc->delayed_work);
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queue_delayed_work(timesync_svc->work_queue,
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×ync_svc->delayed_work, 0);
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}
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break;
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case GB_TIMESYNC_STATE_PING:
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if (timesync_svc->state == GB_TIMESYNC_STATE_ACTIVE) {
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timesync_svc->state = state;
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queue_delayed_work(timesync_svc->work_queue,
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×ync_svc->delayed_work,
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GB_TIMESYNC_DELAYED_WORK_SHORT);
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}
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break;
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case GB_TIMESYNC_STATE_ACTIVE:
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if (timesync_svc->state == GB_TIMESYNC_STATE_AUTHORITATIVE ||
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timesync_svc->state == GB_TIMESYNC_STATE_PING) {
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timesync_svc->state = state;
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wake_up(×ync_svc->wait_queue);
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}
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break;
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}
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if (WARN_ON(timesync_svc->state != state)) {
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pr_err("Invalid state transition %d=>%d\n",
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timesync_svc->state, state);
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}
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}
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static void gb_timesync_set_state_atomic(struct gb_timesync_svc *timesync_svc,
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int state)
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{
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unsigned long flags;
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spin_lock_irqsave(×ync_svc->spinlock, flags);
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gb_timesync_set_state(timesync_svc, state);
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spin_unlock_irqrestore(×ync_svc->spinlock, flags);
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}
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static u64 gb_timesync_diff(u64 x, u64 y)
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{
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if (x > y)
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return x - y;
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else
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return y - x;
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}
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static void gb_timesync_adjust_to_svc(struct gb_timesync_svc *svc,
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u64 svc_frame_time, u64 ap_frame_time)
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{
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if (svc_frame_time > ap_frame_time) {
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svc->frame_time_offset = svc_frame_time - ap_frame_time;
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svc->offset_down = false;
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} else {
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svc->frame_time_offset = ap_frame_time - svc_frame_time;
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svc->offset_down = true;
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}
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}
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/*
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* Associate a FrameTime with a ktime timestamp represented as struct timespec
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* Requires the calling context to hold timesync_svc->mutex
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*/
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static void gb_timesync_store_ktime(struct gb_timesync_svc *timesync_svc,
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struct timespec ts, u64 frame_time)
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{
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timesync_svc->ktime_data.ts = ts;
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timesync_svc->ktime_data.frame_time = frame_time;
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}
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/*
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* Find the two pulses that best-match our expected inter-strobe gap and
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* then calculate the difference between the SVC time at the second pulse
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* to the local time at the second pulse.
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*/
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static void gb_timesync_collate_frame_time(struct gb_timesync_svc *timesync_svc,
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u64 *frame_time)
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{
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int i = 0;
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u64 delta, ap_frame_time;
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u64 strobe_delay_ns = GB_TIMESYNC_STROBE_DELAY_US * NSEC_PER_USEC;
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u64 least = 0;
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for (i = 1; i < GB_TIMESYNC_MAX_STROBES; i++) {
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delta = timesync_svc->strobe_data[i].frame_time -
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timesync_svc->strobe_data[i - 1].frame_time;
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delta *= gb_timesync_ns_per_clock;
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delta = gb_timesync_diff(delta, strobe_delay_ns);
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if (!least || delta < least) {
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least = delta;
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gb_timesync_adjust_to_svc(timesync_svc, frame_time[i],
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timesync_svc->strobe_data[i].frame_time);
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ap_frame_time = timesync_svc->strobe_data[i].frame_time;
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ap_frame_time = gb_timesync_adjust_count(timesync_svc,
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ap_frame_time);
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gb_timesync_store_ktime(timesync_svc,
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timesync_svc->strobe_data[i].ts,
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ap_frame_time);
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pr_debug("adjust %s local %llu svc %llu delta %llu\n",
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timesync_svc->offset_down ? "down" : "up",
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timesync_svc->strobe_data[i].frame_time,
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frame_time[i], delta);
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}
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}
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}
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static void gb_timesync_teardown(struct gb_timesync_svc *timesync_svc)
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{
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struct gb_timesync_interface *timesync_interface;
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struct gb_svc *svc = timesync_svc->svc;
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struct gb_interface *interface;
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struct gb_host_device *hd;
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int ret;
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list_for_each_entry(timesync_interface,
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×ync_svc->interface_list, list) {
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interface = timesync_interface->interface;
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ret = gb_interface_timesync_disable(interface);
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if (ret) {
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dev_err(&interface->dev,
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"interface timesync_disable %d\n", ret);
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}
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}
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hd = timesync_svc->timesync_hd->hd;
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ret = hd->driver->timesync_disable(hd);
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if (ret < 0) {
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dev_err(&hd->dev, "host timesync_disable %d\n",
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ret);
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}
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gb_svc_timesync_wake_pins_release(svc);
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gb_svc_timesync_disable(svc);
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gb_timesync_platform_unlock_bus();
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gb_timesync_set_state_atomic(timesync_svc, GB_TIMESYNC_STATE_INACTIVE);
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}
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static void gb_timesync_platform_lock_bus_fail(struct gb_timesync_svc
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*timesync_svc, int ret)
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{
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if (ret == -EAGAIN) {
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gb_timesync_set_state(timesync_svc, timesync_svc->state);
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} else {
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pr_err("Failed to lock timesync bus %d\n", ret);
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gb_timesync_set_state(timesync_svc, GB_TIMESYNC_STATE_INACTIVE);
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}
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}
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static void gb_timesync_enable(struct gb_timesync_svc *timesync_svc)
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{
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struct gb_svc *svc = timesync_svc->svc;
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struct gb_host_device *hd;
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struct gb_timesync_interface *timesync_interface;
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struct gb_interface *interface;
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u64 init_frame_time;
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unsigned long clock_rate = gb_timesync_clock_rate;
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int ret;
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/*
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* Get access to the wake pins in the AP and SVC
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* Release these pins either in gb_timesync_teardown() or in
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* gb_timesync_authoritative()
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*/
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ret = gb_timesync_platform_lock_bus(timesync_svc);
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if (ret < 0) {
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gb_timesync_platform_lock_bus_fail(timesync_svc, ret);
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return;
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}
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ret = gb_svc_timesync_wake_pins_acquire(svc, timesync_svc->strobe_mask);
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if (ret) {
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dev_err(&svc->dev,
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"gb_svc_timesync_wake_pins_acquire %d\n", ret);
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gb_timesync_teardown(timesync_svc);
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return;
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}
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/* Choose an initial time in the future */
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init_frame_time = __gb_timesync_get_frame_time(timesync_svc) + 100000UL;
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/* Send enable command to all relevant participants */
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list_for_each_entry(timesync_interface, ×ync_svc->interface_list,
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list) {
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interface = timesync_interface->interface;
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ret = gb_interface_timesync_enable(interface,
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GB_TIMESYNC_MAX_STROBES,
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init_frame_time,
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GB_TIMESYNC_STROBE_DELAY_US,
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clock_rate);
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if (ret) {
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dev_err(&interface->dev,
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"interface timesync_enable %d\n", ret);
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}
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}
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hd = timesync_svc->timesync_hd->hd;
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ret = hd->driver->timesync_enable(hd, GB_TIMESYNC_MAX_STROBES,
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init_frame_time,
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GB_TIMESYNC_STROBE_DELAY_US,
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clock_rate);
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if (ret < 0) {
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dev_err(&hd->dev, "host timesync_enable %d\n",
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ret);
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}
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gb_timesync_set_state_atomic(timesync_svc, GB_TIMESYNC_STATE_WAIT_SVC);
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ret = gb_svc_timesync_enable(svc, GB_TIMESYNC_MAX_STROBES,
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init_frame_time,
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GB_TIMESYNC_STROBE_DELAY_US,
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clock_rate);
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if (ret) {
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dev_err(&svc->dev,
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"gb_svc_timesync_enable %d\n", ret);
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gb_timesync_teardown(timesync_svc);
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return;
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}
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/* Schedule a timeout waiting for SVC to complete strobing */
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gb_timesync_schedule_svc_timeout(timesync_svc);
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}
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static void gb_timesync_authoritative(struct gb_timesync_svc *timesync_svc)
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{
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struct gb_svc *svc = timesync_svc->svc;
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struct gb_host_device *hd;
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struct gb_timesync_interface *timesync_interface;
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struct gb_interface *interface;
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u64 svc_frame_time[GB_TIMESYNC_MAX_STROBES];
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int ret;
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/* Get authoritative time from SVC and adjust local clock */
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ret = gb_svc_timesync_authoritative(svc, svc_frame_time);
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if (ret) {
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dev_err(&svc->dev,
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"gb_svc_timesync_authoritative %d\n", ret);
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gb_timesync_teardown(timesync_svc);
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return;
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}
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gb_timesync_collate_frame_time(timesync_svc, svc_frame_time);
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/* Transmit authoritative time to downstream slaves */
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hd = timesync_svc->timesync_hd->hd;
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ret = hd->driver->timesync_authoritative(hd, svc_frame_time);
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if (ret < 0)
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dev_err(&hd->dev, "host timesync_authoritative %d\n", ret);
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list_for_each_entry(timesync_interface,
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×ync_svc->interface_list, list) {
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interface = timesync_interface->interface;
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ret = gb_interface_timesync_authoritative(
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interface,
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svc_frame_time);
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if (ret) {
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dev_err(&interface->dev,
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"interface timesync_authoritative %d\n", ret);
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}
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}
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/* Release wake pins */
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gb_svc_timesync_wake_pins_release(svc);
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gb_timesync_platform_unlock_bus();
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/* Transition to state ACTIVE */
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gb_timesync_set_state_atomic(timesync_svc, GB_TIMESYNC_STATE_ACTIVE);
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/* Schedule a ping to verify the synchronized system time */
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timesync_svc->print_ping = true;
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gb_timesync_set_state_atomic(timesync_svc, GB_TIMESYNC_STATE_PING);
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}
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static int __gb_timesync_get_status(struct gb_timesync_svc *timesync_svc)
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{
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int ret = -EINVAL;
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|
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switch (timesync_svc->state) {
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case GB_TIMESYNC_STATE_INVALID:
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case GB_TIMESYNC_STATE_INACTIVE:
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ret = -ENODEV;
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break;
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case GB_TIMESYNC_STATE_INIT:
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case GB_TIMESYNC_STATE_WAIT_SVC:
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case GB_TIMESYNC_STATE_AUTHORITATIVE:
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ret = -EAGAIN;
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break;
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|
case GB_TIMESYNC_STATE_PING:
|
|
case GB_TIMESYNC_STATE_ACTIVE:
|
|
ret = 0;
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This routine takes a FrameTime and derives the difference with-respect
|
|
* to a reference FrameTime/ktime pair. It then returns the calculated
|
|
* ktime based on the difference between the supplied FrameTime and
|
|
* the reference FrameTime.
|
|
*
|
|
* The time difference is calculated to six decimal places. Taking 19.2MHz
|
|
* as an example this means we have 52.083333~ nanoseconds per clock or
|
|
* 52083333~ femtoseconds per clock.
|
|
*
|
|
* Naively taking the count difference and converting to
|
|
* seconds/nanoseconds would quickly see the 0.0833 component produce
|
|
* noticeable errors. For example a time difference of one second would
|
|
* loose 19200000 * 0.08333x nanoseconds or 1.59 seconds.
|
|
*
|
|
* In contrast calculating in femtoseconds the same example of 19200000 *
|
|
* 0.000000083333x nanoseconds per count of error is just 1.59 nanoseconds!
|
|
*
|
|
* Continuing the example of 19.2 MHz we cap the maximum error difference
|
|
* at a worst-case 0.3 microseconds over a potential calculation window of
|
|
* abount 15 seconds, meaning you can convert a FrameTime that is <= 15
|
|
* seconds older/younger than the reference time with a maximum error of
|
|
* 0.2385 useconds. Note 19.2MHz is an example frequency not a requirement.
|
|
*/
|
|
static int gb_timesync_to_timespec(struct gb_timesync_svc *timesync_svc,
|
|
u64 frame_time, struct timespec *ts)
|
|
{
|
|
unsigned long flags;
|
|
u64 delta_fs, counts, sec, nsec;
|
|
bool add;
|
|
int ret = 0;
|
|
|
|
memset(ts, 0x00, sizeof(*ts));
|
|
mutex_lock(×ync_svc->mutex);
|
|
spin_lock_irqsave(×ync_svc->spinlock, flags);
|
|
|
|
ret = __gb_timesync_get_status(timesync_svc);
|
|
if (ret)
|
|
goto done;
|
|
|
|
/* Support calculating ktime upwards or downwards from the reference */
|
|
if (frame_time < timesync_svc->ktime_data.frame_time) {
|
|
add = false;
|
|
counts = timesync_svc->ktime_data.frame_time - frame_time;
|
|
} else {
|
|
add = true;
|
|
counts = frame_time - timesync_svc->ktime_data.frame_time;
|
|
}
|
|
|
|
/* Enforce the .23 of a usecond boundary @ 19.2MHz */
|
|
if (counts > gb_timesync_max_ktime_diff) {
|
|
ret = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
/* Determine the time difference in femtoseconds */
|
|
delta_fs = counts * gb_timesync_fs_per_clock;
|
|
|
|
/* Convert to seconds */
|
|
sec = delta_fs;
|
|
do_div(sec, NSEC_PER_SEC);
|
|
do_div(sec, 1000000UL);
|
|
|
|
/* Get the nanosecond remainder */
|
|
nsec = do_div(delta_fs, sec);
|
|
do_div(nsec, 1000000UL);
|
|
|
|
if (add) {
|
|
/* Add the calculated offset - overflow nanoseconds upwards */
|
|
ts->tv_sec = timesync_svc->ktime_data.ts.tv_sec + sec;
|
|
ts->tv_nsec = timesync_svc->ktime_data.ts.tv_nsec + nsec;
|
|
if (ts->tv_nsec >= NSEC_PER_SEC) {
|
|
ts->tv_sec++;
|
|
ts->tv_nsec -= NSEC_PER_SEC;
|
|
}
|
|
} else {
|
|
/* Subtract the difference over/underflow as necessary */
|
|
if (nsec > timesync_svc->ktime_data.ts.tv_nsec) {
|
|
sec++;
|
|
nsec = nsec + timesync_svc->ktime_data.ts.tv_nsec;
|
|
nsec = do_div(nsec, NSEC_PER_SEC);
|
|
} else {
|
|
nsec = timesync_svc->ktime_data.ts.tv_nsec - nsec;
|
|
}
|
|
/* Cannot return a negative second value */
|
|
if (sec > timesync_svc->ktime_data.ts.tv_sec) {
|
|
ret = -EINVAL;
|
|
goto done;
|
|
}
|
|
ts->tv_sec = timesync_svc->ktime_data.ts.tv_sec - sec;
|
|
ts->tv_nsec = nsec;
|
|
}
|
|
done:
|
|
spin_unlock_irqrestore(×ync_svc->spinlock, flags);
|
|
mutex_unlock(×ync_svc->mutex);
|
|
return ret;
|
|
}
|
|
|
|
static size_t gb_timesync_log_frame_time(struct gb_timesync_svc *timesync_svc,
|
|
char *buf, size_t buflen)
|
|
{
|
|
struct gb_svc *svc = timesync_svc->svc;
|
|
struct gb_host_device *hd;
|
|
struct gb_timesync_interface *timesync_interface;
|
|
struct gb_interface *interface;
|
|
unsigned int len;
|
|
size_t off;
|
|
|
|
/* AP/SVC */
|
|
off = snprintf(buf, buflen, "%s frametime: ap=%llu %s=%llu ",
|
|
greybus_bus_type.name,
|
|
timesync_svc->ap_ping_frame_time, dev_name(&svc->dev),
|
|
timesync_svc->svc_ping_frame_time);
|
|
len = buflen - off;
|
|
|
|
/* APB/GPB */
|
|
if (len < buflen) {
|
|
hd = timesync_svc->timesync_hd->hd;
|
|
off += snprintf(&buf[off], len, "%s=%llu ", dev_name(&hd->dev),
|
|
timesync_svc->timesync_hd->ping_frame_time);
|
|
len = buflen - off;
|
|
}
|
|
|
|
list_for_each_entry(timesync_interface,
|
|
×ync_svc->interface_list, list) {
|
|
if (len < buflen) {
|
|
interface = timesync_interface->interface;
|
|
off += snprintf(&buf[off], len, "%s=%llu ",
|
|
dev_name(&interface->dev),
|
|
timesync_interface->ping_frame_time);
|
|
len = buflen - off;
|
|
}
|
|
}
|
|
if (len < buflen)
|
|
off += snprintf(&buf[off], len, "\n");
|
|
return off;
|
|
}
|
|
|
|
static size_t gb_timesync_log_frame_ktime(struct gb_timesync_svc *timesync_svc,
|
|
char *buf, size_t buflen)
|
|
{
|
|
struct gb_svc *svc = timesync_svc->svc;
|
|
struct gb_host_device *hd;
|
|
struct gb_timesync_interface *timesync_interface;
|
|
struct gb_interface *interface;
|
|
struct timespec ts;
|
|
unsigned int len;
|
|
size_t off;
|
|
|
|
/* AP */
|
|
gb_timesync_to_timespec(timesync_svc, timesync_svc->ap_ping_frame_time,
|
|
&ts);
|
|
off = snprintf(buf, buflen, "%s frametime: ap=%lu.%lu ",
|
|
greybus_bus_type.name, ts.tv_sec, ts.tv_nsec);
|
|
len = buflen - off;
|
|
if (len >= buflen)
|
|
goto done;
|
|
|
|
/* SVC */
|
|
gb_timesync_to_timespec(timesync_svc, timesync_svc->svc_ping_frame_time,
|
|
&ts);
|
|
off += snprintf(&buf[off], len, "%s=%lu.%lu ", dev_name(&svc->dev),
|
|
ts.tv_sec, ts.tv_nsec);
|
|
len = buflen - off;
|
|
if (len >= buflen)
|
|
goto done;
|
|
|
|
/* APB/GPB */
|
|
hd = timesync_svc->timesync_hd->hd;
|
|
gb_timesync_to_timespec(timesync_svc,
|
|
timesync_svc->timesync_hd->ping_frame_time,
|
|
&ts);
|
|
off += snprintf(&buf[off], len, "%s=%lu.%lu ",
|
|
dev_name(&hd->dev),
|
|
ts.tv_sec, ts.tv_nsec);
|
|
len = buflen - off;
|
|
if (len >= buflen)
|
|
goto done;
|
|
|
|
list_for_each_entry(timesync_interface,
|
|
×ync_svc->interface_list, list) {
|
|
interface = timesync_interface->interface;
|
|
gb_timesync_to_timespec(timesync_svc,
|
|
timesync_interface->ping_frame_time,
|
|
&ts);
|
|
off += snprintf(&buf[off], len, "%s=%lu.%lu ",
|
|
dev_name(&interface->dev),
|
|
ts.tv_sec, ts.tv_nsec);
|
|
len = buflen - off;
|
|
if (len >= buflen)
|
|
goto done;
|
|
}
|
|
off += snprintf(&buf[off], len, "\n");
|
|
done:
|
|
return off;
|
|
}
|
|
|
|
/*
|
|
* Send an SVC initiated wake 'ping' to each TimeSync participant.
|
|
* Get the FrameTime from each participant associated with the wake
|
|
* ping.
|
|
*/
|
|
static void gb_timesync_ping(struct gb_timesync_svc *timesync_svc)
|
|
{
|
|
struct gb_svc *svc = timesync_svc->svc;
|
|
struct gb_host_device *hd;
|
|
struct gb_timesync_interface *timesync_interface;
|
|
struct gb_control *control;
|
|
u64 *ping_frame_time;
|
|
int ret;
|
|
|
|
/* Get access to the wake pins in the AP and SVC */
|
|
ret = gb_timesync_platform_lock_bus(timesync_svc);
|
|
if (ret < 0) {
|
|
gb_timesync_platform_lock_bus_fail(timesync_svc, ret);
|
|
return;
|
|
}
|
|
ret = gb_svc_timesync_wake_pins_acquire(svc, timesync_svc->strobe_mask);
|
|
if (ret) {
|
|
dev_err(&svc->dev,
|
|
"gb_svc_timesync_wake_pins_acquire %d\n", ret);
|
|
gb_timesync_teardown(timesync_svc);
|
|
return;
|
|
}
|
|
|
|
/* Have SVC generate a timesync ping */
|
|
timesync_svc->capture_ping = true;
|
|
timesync_svc->svc_ping_frame_time = 0;
|
|
ret = gb_svc_timesync_ping(svc, ×ync_svc->svc_ping_frame_time);
|
|
timesync_svc->capture_ping = false;
|
|
if (ret) {
|
|
dev_err(&svc->dev,
|
|
"gb_svc_timesync_ping %d\n", ret);
|
|
gb_timesync_teardown(timesync_svc);
|
|
return;
|
|
}
|
|
|
|
/* Get the ping FrameTime from each APB/GPB */
|
|
hd = timesync_svc->timesync_hd->hd;
|
|
timesync_svc->timesync_hd->ping_frame_time = 0;
|
|
ret = hd->driver->timesync_get_last_event(hd,
|
|
×ync_svc->timesync_hd->ping_frame_time);
|
|
if (ret)
|
|
dev_err(&hd->dev, "host timesync_get_last_event %d\n", ret);
|
|
|
|
list_for_each_entry(timesync_interface,
|
|
×ync_svc->interface_list, list) {
|
|
control = timesync_interface->interface->control;
|
|
timesync_interface->ping_frame_time = 0;
|
|
ping_frame_time = ×ync_interface->ping_frame_time;
|
|
ret = gb_control_timesync_get_last_event(control,
|
|
ping_frame_time);
|
|
if (ret) {
|
|
dev_err(×ync_interface->interface->dev,
|
|
"gb_control_timesync_get_last_event %d\n", ret);
|
|
}
|
|
}
|
|
|
|
/* Ping success - move to timesync active */
|
|
gb_svc_timesync_wake_pins_release(svc);
|
|
gb_timesync_platform_unlock_bus();
|
|
gb_timesync_set_state_atomic(timesync_svc, GB_TIMESYNC_STATE_ACTIVE);
|
|
}
|
|
|
|
static void gb_timesync_log_ping_time(struct gb_timesync_svc *timesync_svc)
|
|
{
|
|
char *buf;
|
|
|
|
if (!timesync_svc->print_ping)
|
|
return;
|
|
|
|
buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
|
|
if (buf) {
|
|
gb_timesync_log_frame_time(timesync_svc, buf, PAGE_SIZE);
|
|
dev_dbg(×ync_svc->svc->dev, "%s", buf);
|
|
kfree(buf);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Perform the actual work of scheduled TimeSync logic.
|
|
*/
|
|
static void gb_timesync_worker(struct work_struct *work)
|
|
{
|
|
struct delayed_work *delayed_work = to_delayed_work(work);
|
|
struct gb_timesync_svc *timesync_svc =
|
|
container_of(delayed_work, struct gb_timesync_svc, delayed_work);
|
|
|
|
mutex_lock(×ync_svc->mutex);
|
|
|
|
switch (timesync_svc->state) {
|
|
case GB_TIMESYNC_STATE_INIT:
|
|
gb_timesync_enable(timesync_svc);
|
|
break;
|
|
|
|
case GB_TIMESYNC_STATE_WAIT_SVC:
|
|
dev_err(×ync_svc->svc->dev,
|
|
"timeout SVC strobe completion\n");
|
|
gb_timesync_teardown(timesync_svc);
|
|
break;
|
|
|
|
case GB_TIMESYNC_STATE_AUTHORITATIVE:
|
|
gb_timesync_authoritative(timesync_svc);
|
|
break;
|
|
|
|
case GB_TIMESYNC_STATE_PING:
|
|
gb_timesync_ping(timesync_svc);
|
|
gb_timesync_log_ping_time(timesync_svc);
|
|
break;
|
|
|
|
default:
|
|
pr_err("Invalid state %d for delayed work\n",
|
|
timesync_svc->state);
|
|
break;
|
|
}
|
|
|
|
mutex_unlock(×ync_svc->mutex);
|
|
}
|
|
|
|
/*
|
|
* Schedule a new TimeSync INIT or PING operation serialized w/r to
|
|
* gb_timesync_worker().
|
|
*/
|
|
static int gb_timesync_schedule(struct gb_timesync_svc *timesync_svc, int state)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (state != GB_TIMESYNC_STATE_INIT && state != GB_TIMESYNC_STATE_PING)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(×ync_svc->mutex);
|
|
if (timesync_svc->state == GB_TIMESYNC_STATE_INACTIVE ||
|
|
timesync_svc->state == GB_TIMESYNC_STATE_ACTIVE) {
|
|
gb_timesync_set_state_atomic(timesync_svc, state);
|
|
} else {
|
|
ret = -ENODEV;
|
|
}
|
|
mutex_unlock(×ync_svc->mutex);
|
|
return ret;
|
|
}
|
|
|
|
static int __gb_timesync_schedule_synchronous(
|
|
struct gb_timesync_svc *timesync_svc, int state)
|
|
{
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
ret = gb_timesync_schedule(timesync_svc, state);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = wait_event_interruptible(timesync_svc->wait_queue,
|
|
(timesync_svc->state == GB_TIMESYNC_STATE_ACTIVE ||
|
|
timesync_svc->state == GB_TIMESYNC_STATE_INACTIVE ||
|
|
timesync_svc->state == GB_TIMESYNC_STATE_INVALID));
|
|
if (ret)
|
|
return ret;
|
|
|
|
mutex_lock(×ync_svc->mutex);
|
|
spin_lock_irqsave(×ync_svc->spinlock, flags);
|
|
|
|
ret = __gb_timesync_get_status(timesync_svc);
|
|
|
|
spin_unlock_irqrestore(×ync_svc->spinlock, flags);
|
|
mutex_unlock(×ync_svc->mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct gb_timesync_svc *gb_timesync_find_timesync_svc(
|
|
struct gb_host_device *hd)
|
|
{
|
|
struct gb_timesync_svc *timesync_svc;
|
|
|
|
list_for_each_entry(timesync_svc, &gb_timesync_svc_list, list) {
|
|
if (timesync_svc->svc == hd->svc)
|
|
return timesync_svc;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct gb_timesync_interface *gb_timesync_find_timesync_interface(
|
|
struct gb_timesync_svc *timesync_svc,
|
|
struct gb_interface *interface)
|
|
{
|
|
struct gb_timesync_interface *timesync_interface;
|
|
|
|
list_for_each_entry(timesync_interface, ×ync_svc->interface_list, list) {
|
|
if (timesync_interface->interface == interface)
|
|
return timesync_interface;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
int gb_timesync_schedule_synchronous(struct gb_interface *interface)
|
|
{
|
|
int ret;
|
|
struct gb_timesync_svc *timesync_svc;
|
|
|
|
if (!(interface->features & GREYBUS_INTERFACE_FEATURE_TIMESYNC))
|
|
return 0;
|
|
|
|
mutex_lock(&gb_timesync_svc_list_mutex);
|
|
timesync_svc = gb_timesync_find_timesync_svc(interface->hd);
|
|
if (!timesync_svc) {
|
|
ret = -ENODEV;
|
|
goto done;
|
|
}
|
|
|
|
ret = __gb_timesync_schedule_synchronous(timesync_svc,
|
|
GB_TIMESYNC_STATE_INIT);
|
|
done:
|
|
mutex_unlock(&gb_timesync_svc_list_mutex);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gb_timesync_schedule_synchronous);
|
|
|
|
void gb_timesync_schedule_asynchronous(struct gb_interface *interface)
|
|
{
|
|
struct gb_timesync_svc *timesync_svc;
|
|
|
|
if (!(interface->features & GREYBUS_INTERFACE_FEATURE_TIMESYNC))
|
|
return;
|
|
|
|
mutex_lock(&gb_timesync_svc_list_mutex);
|
|
timesync_svc = gb_timesync_find_timesync_svc(interface->hd);
|
|
if (!timesync_svc)
|
|
goto done;
|
|
|
|
gb_timesync_schedule(timesync_svc, GB_TIMESYNC_STATE_INIT);
|
|
done:
|
|
mutex_unlock(&gb_timesync_svc_list_mutex);
|
|
return;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gb_timesync_schedule_asynchronous);
|
|
|
|
static ssize_t gb_timesync_ping_read(struct file *file, char __user *ubuf,
|
|
size_t len, loff_t *offset, bool ktime)
|
|
{
|
|
struct gb_timesync_svc *timesync_svc = file->f_inode->i_private;
|
|
char *buf;
|
|
ssize_t ret = 0;
|
|
|
|
mutex_lock(&gb_timesync_svc_list_mutex);
|
|
mutex_lock(×ync_svc->mutex);
|
|
if (list_empty(×ync_svc->interface_list))
|
|
ret = -ENODEV;
|
|
timesync_svc->print_ping = false;
|
|
mutex_unlock(×ync_svc->mutex);
|
|
if (ret)
|
|
goto done;
|
|
|
|
ret = __gb_timesync_schedule_synchronous(timesync_svc,
|
|
GB_TIMESYNC_STATE_PING);
|
|
if (ret)
|
|
goto done;
|
|
|
|
buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
|
|
if (!buf) {
|
|
ret = -ENOMEM;
|
|
goto done;
|
|
}
|
|
|
|
if (ktime)
|
|
ret = gb_timesync_log_frame_ktime(timesync_svc, buf, PAGE_SIZE);
|
|
else
|
|
ret = gb_timesync_log_frame_time(timesync_svc, buf, PAGE_SIZE);
|
|
if (ret > 0)
|
|
ret = simple_read_from_buffer(ubuf, len, offset, buf, ret);
|
|
kfree(buf);
|
|
done:
|
|
mutex_unlock(&gb_timesync_svc_list_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t gb_timesync_ping_read_frame_time(struct file *file,
|
|
char __user *buf,
|
|
size_t len, loff_t *offset)
|
|
{
|
|
return gb_timesync_ping_read(file, buf, len, offset, false);
|
|
}
|
|
|
|
static ssize_t gb_timesync_ping_read_frame_ktime(struct file *file,
|
|
char __user *buf,
|
|
size_t len, loff_t *offset)
|
|
{
|
|
return gb_timesync_ping_read(file, buf, len, offset, true);
|
|
}
|
|
|
|
static const struct file_operations gb_timesync_debugfs_frame_time_ops = {
|
|
.read = gb_timesync_ping_read_frame_time,
|
|
};
|
|
|
|
static const struct file_operations gb_timesync_debugfs_frame_ktime_ops = {
|
|
.read = gb_timesync_ping_read_frame_ktime,
|
|
};
|
|
|
|
static int gb_timesync_hd_add(struct gb_timesync_svc *timesync_svc,
|
|
struct gb_host_device *hd)
|
|
{
|
|
struct gb_timesync_host_device *timesync_hd;
|
|
|
|
timesync_hd = kzalloc(sizeof(*timesync_hd), GFP_KERNEL);
|
|
if (!timesync_hd)
|
|
return -ENOMEM;
|
|
|
|
WARN_ON(timesync_svc->timesync_hd);
|
|
timesync_hd->hd = hd;
|
|
timesync_svc->timesync_hd = timesync_hd;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void gb_timesync_hd_remove(struct gb_timesync_svc *timesync_svc,
|
|
struct gb_host_device *hd)
|
|
{
|
|
if (timesync_svc->timesync_hd->hd == hd) {
|
|
kfree(timesync_svc->timesync_hd);
|
|
timesync_svc->timesync_hd = NULL;
|
|
return;
|
|
}
|
|
WARN_ON(1);
|
|
}
|
|
|
|
int gb_timesync_svc_add(struct gb_svc *svc)
|
|
{
|
|
struct gb_timesync_svc *timesync_svc;
|
|
int ret;
|
|
|
|
timesync_svc = kzalloc(sizeof(*timesync_svc), GFP_KERNEL);
|
|
if (!timesync_svc)
|
|
return -ENOMEM;
|
|
|
|
timesync_svc->work_queue =
|
|
create_singlethread_workqueue("gb-timesync-work_queue");
|
|
|
|
if (!timesync_svc->work_queue) {
|
|
kfree(timesync_svc);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
mutex_lock(&gb_timesync_svc_list_mutex);
|
|
INIT_LIST_HEAD(×ync_svc->interface_list);
|
|
INIT_DELAYED_WORK(×ync_svc->delayed_work, gb_timesync_worker);
|
|
mutex_init(×ync_svc->mutex);
|
|
spin_lock_init(×ync_svc->spinlock);
|
|
init_waitqueue_head(×ync_svc->wait_queue);
|
|
|
|
timesync_svc->svc = svc;
|
|
timesync_svc->frame_time_offset = 0;
|
|
timesync_svc->capture_ping = false;
|
|
gb_timesync_set_state_atomic(timesync_svc, GB_TIMESYNC_STATE_INACTIVE);
|
|
|
|
timesync_svc->frame_time_dentry =
|
|
debugfs_create_file("frame-time", S_IRUGO, svc->debugfs_dentry,
|
|
timesync_svc,
|
|
&gb_timesync_debugfs_frame_time_ops);
|
|
timesync_svc->frame_ktime_dentry =
|
|
debugfs_create_file("frame-ktime", S_IRUGO, svc->debugfs_dentry,
|
|
timesync_svc,
|
|
&gb_timesync_debugfs_frame_ktime_ops);
|
|
|
|
list_add(×ync_svc->list, &gb_timesync_svc_list);
|
|
ret = gb_timesync_hd_add(timesync_svc, svc->hd);
|
|
if (ret) {
|
|
list_del(×ync_svc->list);
|
|
debugfs_remove(timesync_svc->frame_ktime_dentry);
|
|
debugfs_remove(timesync_svc->frame_time_dentry);
|
|
destroy_workqueue(timesync_svc->work_queue);
|
|
kfree(timesync_svc);
|
|
goto done;
|
|
}
|
|
|
|
init_timer(×ync_svc->ktime_timer);
|
|
timesync_svc->ktime_timer.function = gb_timesync_ktime_timer_fn;
|
|
timesync_svc->ktime_timer.expires = jiffies + GB_TIMESYNC_KTIME_UPDATE;
|
|
timesync_svc->ktime_timer.data = (unsigned long)timesync_svc;
|
|
add_timer(×ync_svc->ktime_timer);
|
|
done:
|
|
mutex_unlock(&gb_timesync_svc_list_mutex);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gb_timesync_svc_add);
|
|
|
|
void gb_timesync_svc_remove(struct gb_svc *svc)
|
|
{
|
|
struct gb_timesync_svc *timesync_svc;
|
|
struct gb_timesync_interface *timesync_interface;
|
|
struct gb_timesync_interface *next;
|
|
|
|
mutex_lock(&gb_timesync_svc_list_mutex);
|
|
timesync_svc = gb_timesync_find_timesync_svc(svc->hd);
|
|
if (!timesync_svc)
|
|
goto done;
|
|
|
|
cancel_delayed_work_sync(×ync_svc->delayed_work);
|
|
|
|
mutex_lock(×ync_svc->mutex);
|
|
|
|
gb_timesync_set_state_atomic(timesync_svc, GB_TIMESYNC_STATE_INVALID);
|
|
del_timer_sync(×ync_svc->ktime_timer);
|
|
gb_timesync_teardown(timesync_svc);
|
|
|
|
gb_timesync_hd_remove(timesync_svc, svc->hd);
|
|
list_for_each_entry_safe(timesync_interface, next,
|
|
×ync_svc->interface_list, list) {
|
|
list_del(×ync_interface->list);
|
|
kfree(timesync_interface);
|
|
}
|
|
debugfs_remove(timesync_svc->frame_ktime_dentry);
|
|
debugfs_remove(timesync_svc->frame_time_dentry);
|
|
destroy_workqueue(timesync_svc->work_queue);
|
|
list_del(×ync_svc->list);
|
|
|
|
mutex_unlock(×ync_svc->mutex);
|
|
|
|
kfree(timesync_svc);
|
|
done:
|
|
mutex_unlock(&gb_timesync_svc_list_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gb_timesync_svc_remove);
|
|
|
|
/*
|
|
* Add a Greybus Interface to the set of TimeSync Interfaces.
|
|
*/
|
|
int gb_timesync_interface_add(struct gb_interface *interface)
|
|
{
|
|
struct gb_timesync_svc *timesync_svc;
|
|
struct gb_timesync_interface *timesync_interface;
|
|
int ret = 0;
|
|
|
|
if (!(interface->features & GREYBUS_INTERFACE_FEATURE_TIMESYNC))
|
|
return 0;
|
|
|
|
mutex_lock(&gb_timesync_svc_list_mutex);
|
|
timesync_svc = gb_timesync_find_timesync_svc(interface->hd);
|
|
if (!timesync_svc) {
|
|
ret = -ENODEV;
|
|
goto done;
|
|
}
|
|
|
|
timesync_interface = kzalloc(sizeof(*timesync_interface), GFP_KERNEL);
|
|
if (!timesync_interface) {
|
|
ret = -ENOMEM;
|
|
goto done;
|
|
}
|
|
|
|
mutex_lock(×ync_svc->mutex);
|
|
timesync_interface->interface = interface;
|
|
list_add(×ync_interface->list, ×ync_svc->interface_list);
|
|
timesync_svc->strobe_mask |= 1 << interface->interface_id;
|
|
mutex_unlock(×ync_svc->mutex);
|
|
|
|
done:
|
|
mutex_unlock(&gb_timesync_svc_list_mutex);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gb_timesync_interface_add);
|
|
|
|
/*
|
|
* Remove a Greybus Interface from the set of TimeSync Interfaces.
|
|
*/
|
|
void gb_timesync_interface_remove(struct gb_interface *interface)
|
|
{
|
|
struct gb_timesync_svc *timesync_svc;
|
|
struct gb_timesync_interface *timesync_interface;
|
|
|
|
if (!(interface->features & GREYBUS_INTERFACE_FEATURE_TIMESYNC))
|
|
return;
|
|
|
|
mutex_lock(&gb_timesync_svc_list_mutex);
|
|
timesync_svc = gb_timesync_find_timesync_svc(interface->hd);
|
|
if (!timesync_svc)
|
|
goto done;
|
|
|
|
timesync_interface = gb_timesync_find_timesync_interface(timesync_svc,
|
|
interface);
|
|
if (!timesync_interface)
|
|
goto done;
|
|
|
|
mutex_lock(×ync_svc->mutex);
|
|
timesync_svc->strobe_mask &= ~(1 << interface->interface_id);
|
|
list_del(×ync_interface->list);
|
|
kfree(timesync_interface);
|
|
mutex_unlock(×ync_svc->mutex);
|
|
done:
|
|
mutex_unlock(&gb_timesync_svc_list_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gb_timesync_interface_remove);
|
|
|
|
/*
|
|
* Give the authoritative FrameTime to the calling function. Returns zero if we
|
|
* are not in GB_TIMESYNC_STATE_ACTIVE.
|
|
*/
|
|
static u64 gb_timesync_get_frame_time(struct gb_timesync_svc *timesync_svc)
|
|
{
|
|
unsigned long flags;
|
|
u64 ret;
|
|
|
|
spin_lock_irqsave(×ync_svc->spinlock, flags);
|
|
if (timesync_svc->state == GB_TIMESYNC_STATE_ACTIVE)
|
|
ret = __gb_timesync_get_frame_time(timesync_svc);
|
|
else
|
|
ret = 0;
|
|
spin_unlock_irqrestore(×ync_svc->spinlock, flags);
|
|
return ret;
|
|
}
|
|
|
|
u64 gb_timesync_get_frame_time_by_interface(struct gb_interface *interface)
|
|
{
|
|
struct gb_timesync_svc *timesync_svc;
|
|
u64 ret = 0;
|
|
|
|
mutex_lock(&gb_timesync_svc_list_mutex);
|
|
timesync_svc = gb_timesync_find_timesync_svc(interface->hd);
|
|
if (!timesync_svc)
|
|
goto done;
|
|
|
|
ret = gb_timesync_get_frame_time(timesync_svc);
|
|
done:
|
|
mutex_unlock(&gb_timesync_svc_list_mutex);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gb_timesync_get_frame_time_by_interface);
|
|
|
|
u64 gb_timesync_get_frame_time_by_svc(struct gb_svc *svc)
|
|
{
|
|
struct gb_timesync_svc *timesync_svc;
|
|
u64 ret = 0;
|
|
|
|
mutex_lock(&gb_timesync_svc_list_mutex);
|
|
timesync_svc = gb_timesync_find_timesync_svc(svc->hd);
|
|
if (!timesync_svc)
|
|
goto done;
|
|
|
|
ret = gb_timesync_get_frame_time(timesync_svc);
|
|
done:
|
|
mutex_unlock(&gb_timesync_svc_list_mutex);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gb_timesync_get_frame_time_by_svc);
|
|
|
|
/* Incrementally updates the conversion base from FrameTime to ktime */
|
|
static void gb_timesync_ktime_timer_fn(unsigned long data)
|
|
{
|
|
struct gb_timesync_svc *timesync_svc =
|
|
(struct gb_timesync_svc *)data;
|
|
unsigned long flags;
|
|
u64 frame_time;
|
|
struct timespec ts;
|
|
|
|
spin_lock_irqsave(×ync_svc->spinlock, flags);
|
|
|
|
if (timesync_svc->state != GB_TIMESYNC_STATE_ACTIVE)
|
|
goto done;
|
|
|
|
ktime_get_ts(&ts);
|
|
frame_time = __gb_timesync_get_frame_time(timesync_svc);
|
|
gb_timesync_store_ktime(timesync_svc, ts, frame_time);
|
|
|
|
done:
|
|
spin_unlock_irqrestore(×ync_svc->spinlock, flags);
|
|
mod_timer(×ync_svc->ktime_timer,
|
|
jiffies + GB_TIMESYNC_KTIME_UPDATE);
|
|
}
|
|
|
|
int gb_timesync_to_timespec_by_svc(struct gb_svc *svc, u64 frame_time,
|
|
struct timespec *ts)
|
|
{
|
|
struct gb_timesync_svc *timesync_svc;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&gb_timesync_svc_list_mutex);
|
|
timesync_svc = gb_timesync_find_timesync_svc(svc->hd);
|
|
if (!timesync_svc) {
|
|
ret = -ENODEV;
|
|
goto done;
|
|
}
|
|
ret = gb_timesync_to_timespec(timesync_svc, frame_time, ts);
|
|
done:
|
|
mutex_unlock(&gb_timesync_svc_list_mutex);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gb_timesync_to_timespec_by_svc);
|
|
|
|
int gb_timesync_to_timespec_by_interface(struct gb_interface *interface,
|
|
u64 frame_time, struct timespec *ts)
|
|
{
|
|
struct gb_timesync_svc *timesync_svc;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&gb_timesync_svc_list_mutex);
|
|
timesync_svc = gb_timesync_find_timesync_svc(interface->hd);
|
|
if (!timesync_svc) {
|
|
ret = -ENODEV;
|
|
goto done;
|
|
}
|
|
|
|
ret = gb_timesync_to_timespec(timesync_svc, frame_time, ts);
|
|
done:
|
|
mutex_unlock(&gb_timesync_svc_list_mutex);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gb_timesync_to_timespec_by_interface);
|
|
|
|
void gb_timesync_irq(struct gb_timesync_svc *timesync_svc)
|
|
{
|
|
unsigned long flags;
|
|
u64 strobe_time;
|
|
bool strobe_is_ping = true;
|
|
struct timespec ts;
|
|
|
|
ktime_get_ts(&ts);
|
|
strobe_time = __gb_timesync_get_frame_time(timesync_svc);
|
|
|
|
spin_lock_irqsave(×ync_svc->spinlock, flags);
|
|
|
|
if (timesync_svc->state == GB_TIMESYNC_STATE_PING) {
|
|
if (!timesync_svc->capture_ping)
|
|
goto done_nolog;
|
|
timesync_svc->ap_ping_frame_time = strobe_time;
|
|
goto done_log;
|
|
} else if (timesync_svc->state != GB_TIMESYNC_STATE_WAIT_SVC) {
|
|
goto done_nolog;
|
|
}
|
|
|
|
timesync_svc->strobe_data[timesync_svc->strobe].frame_time = strobe_time;
|
|
timesync_svc->strobe_data[timesync_svc->strobe].ts = ts;
|
|
|
|
if (++timesync_svc->strobe == GB_TIMESYNC_MAX_STROBES) {
|
|
gb_timesync_set_state(timesync_svc,
|
|
GB_TIMESYNC_STATE_AUTHORITATIVE);
|
|
}
|
|
strobe_is_ping = false;
|
|
done_log:
|
|
trace_gb_timesync_irq(strobe_is_ping, timesync_svc->strobe,
|
|
GB_TIMESYNC_MAX_STROBES, strobe_time);
|
|
done_nolog:
|
|
spin_unlock_irqrestore(×ync_svc->spinlock, flags);
|
|
}
|
|
EXPORT_SYMBOL(gb_timesync_irq);
|
|
|
|
int __init gb_timesync_init(void)
|
|
{
|
|
int ret = 0;
|
|
|
|
ret = gb_timesync_platform_init();
|
|
if (ret) {
|
|
pr_err("timesync platform init fail!\n");
|
|
return ret;
|
|
}
|
|
|
|
gb_timesync_clock_rate = gb_timesync_platform_get_clock_rate();
|
|
|
|
/* Calculate nanoseconds and femtoseconds per clock */
|
|
gb_timesync_fs_per_clock = FSEC_PER_SEC;
|
|
do_div(gb_timesync_fs_per_clock, gb_timesync_clock_rate);
|
|
gb_timesync_ns_per_clock = NSEC_PER_SEC;
|
|
do_div(gb_timesync_ns_per_clock, gb_timesync_clock_rate);
|
|
|
|
/* Calculate the maximum number of clocks we will convert to ktime */
|
|
gb_timesync_max_ktime_diff =
|
|
GB_TIMESYNC_MAX_KTIME_CONVERSION * gb_timesync_clock_rate;
|
|
|
|
pr_info("Time-Sync @ %lu Hz max ktime conversion +/- %d seconds\n",
|
|
gb_timesync_clock_rate, GB_TIMESYNC_MAX_KTIME_CONVERSION);
|
|
return 0;
|
|
}
|
|
|
|
void gb_timesync_exit(void)
|
|
{
|
|
gb_timesync_platform_exit();
|
|
}
|