timer_irq: Rename generic/timer.c to generic/timer_irq.c

Rename the file to make it clear that the code is helper functions for
boards with irq based timers.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

1 files changed, 0 insertions, 117 deletions

diff --git a/src/generic/timer.c b/src/generic/timer.c
deleted file mode 100644
index fba56051..00000000
--- a/src/generic/timer.c
+++ /dev/null
@@ -1,117 +0,0 @@
-// Generic interrupt based timer helper functions
-//
-// Copyright (C) 2017  Kevin O'Connor <kevin@koconnor.net>
-//
-// This file may be distributed under the terms of the GNU GPLv3 license.
-
-#include "autoconf.h" // CONFIG_CLOCK_FREQ
-#include "board/irq.h" // irq_disable
-#include "board/misc.h" // timer_from_us
-#include "command.h" // shutdown
-#include "sched.h" // sched_timer_kick
-
-// In order to use this code the board must still define
-// timer_read_time().  In addition, it must also provide a timer_set()
-// function.
-void timer_set(uint32_t next);
-
-DECL_CONSTANT(CLOCK_FREQ, CONFIG_CLOCK_FREQ);
-
-// Return the number of clock ticks for a given number of microseconds
-uint32_t
-timer_from_us(uint32_t us)
-{
-    return us * (CONFIG_CLOCK_FREQ / 1000000);
-}
-
-// Return true if time1 is before time2.  Always use this function to
-// compare times as regular C comparisons can fail if the counter
-// rolls over.
-uint8_t
-timer_is_before(uint32_t time1, uint32_t time2)
-{
-    return (int32_t)(time1 - time2) < 0;
-}
-
-// Called by main code once every millisecond.  (IRQs disabled.)
-void
-timer_periodic(void)
-{
-}
-
-static uint32_t timer_repeat_until;
-#define TIMER_IDLE_REPEAT_TICKS timer_from_us(500)
-#define TIMER_REPEAT_TICKS timer_from_us(100)
-
-#define TIMER_MIN_TRY_TICKS timer_from_us(1)
-#define TIMER_DEFER_REPEAT_TICKS timer_from_us(5)
-
-// Set the next timer wake time (in absolute clock ticks) or return 1
-// if the next timer is too close to schedule.  Caller must disable
-// irqs.
-static int
-timer_try_set_next(unsigned int next)
-{
-    uint32_t now = timer_read_time();
-    int32_t diff = next - now;
-    if (diff > (int32_t)TIMER_MIN_TRY_TICKS)
-        // Schedule next timer normally.
-        goto done;
-
-    // Next timer is in the past or near future - can't reschedule to it
-    if (likely(timer_is_before(now, timer_repeat_until))) {
-        // Can run more timers from this irq; briefly allow irqs
-        irq_enable();
-        while (diff >= 0) {
-            // Next timer is in the near future - wait for time to occur
-            now = timer_read_time();
-            diff = next - now;
-        }
-        irq_disable();
-        return 0;
-    }
-    if (diff < (int32_t)(-timer_from_us(1000)))
-        goto fail;
-
-    // Too many repeat timers from a single interrupt - force a pause
-    timer_repeat_until = now + TIMER_REPEAT_TICKS;
-    next = now + TIMER_DEFER_REPEAT_TICKS;
-
-done:
-    timer_set(next);
-    return 1;
-fail:
-    shutdown("Rescheduled timer in the past");
-}
-
-// Invoke timers - called from board irq code.
-void
-timer_dispatch_many(void)
-{
-    for (;;) {
-        uint32_t next_waketime = sched_timer_dispatch();
-
-        // Schedule next timer event (or run next timer if it's ready)
-        int res = timer_try_set_next(next_waketime);
-        if (res)
-            break;
-    }
-}
-
-// Periodic background task that temporarily boosts priority of
-// timers.  This helps prioritize timers when tasks are idling.
-static void
-timer_task(void)
-{
-    irq_disable();
-    timer_repeat_until = timer_read_time() + TIMER_IDLE_REPEAT_TICKS;
-    irq_enable();
-}
-DECL_TASK(timer_task);
-
-static void
-timer_irq_shutdown(void)
-{
-    timer_repeat_until = timer_read_time() + TIMER_IDLE_REPEAT_TICKS;
-}
-DECL_SHUTDOWN(timer_irq_shutdown);