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4a0b4262d3
Adds a new HOOK_TICK event which is called every 250ms (LM4) or 500ms (STM32). This will be used to consolidate a number of tasks which do small amounts of work infrequently, and previously needed their own task functions. This CL adds the tick task; subsequent CLs will consolidate watchdog and other tasks into tick hooks. BUG=chrome-os-partner:15714 BRANCH=none TEST=taskinfo shows TICK task as lowest priority Change-Id: I9068ee99d56a5bf5c12afd86ad51998c013f4954 Signed-off-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/36908 Reviewed-by: Simon Glass <sjg@chromium.org>
78 lines
2.0 KiB
C
78 lines
2.0 KiB
C
/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* System hooks for Chrome EC */
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#include "hooks.h"
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#include "link_defs.h"
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#include "timer.h"
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#include "util.h"
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struct hook_ptrs {
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const struct hook_data *start;
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const struct hook_data *end;
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};
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/*
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* Hook data start and end pointers for each type of hook. Must be in same
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* order as enum hook_type.
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*/
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static const struct hook_ptrs hook_list[] = {
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{__hooks_init, __hooks_init_end},
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{__hooks_freq_change, __hooks_freq_change_end},
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{__hooks_sysjump, __hooks_sysjump_end},
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{__hooks_chipset_pre_init, __hooks_chipset_pre_init_end},
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{__hooks_chipset_startup, __hooks_chipset_startup_end},
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{__hooks_chipset_resume, __hooks_chipset_resume_end},
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{__hooks_chipset_suspend, __hooks_chipset_suspend_end},
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{__hooks_chipset_shutdown, __hooks_chipset_shutdown_end},
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{__hooks_ac_change, __hooks_ac_change_end},
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{__hooks_lid_change, __hooks_lid_change_end},
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{__hooks_tick, __hooks_tick_end},
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};
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void hook_notify(enum hook_type type)
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{
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const struct hook_data *start, *end, *p;
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int count, called = 0;
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int last_prio = HOOK_PRIO_FIRST - 1, prio;
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start = hook_list[type].start;
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end = hook_list[type].end;
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count = ((uint32_t)end - (uint32_t)start) / sizeof(struct hook_data);
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/* Call all the hooks in priority order */
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while (called < count) {
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/* Find the lowest remaining priority */
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for (p = start, prio = HOOK_PRIO_LAST + 1; p < end; p++) {
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if (p->priority < prio && p->priority > last_prio)
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prio = p->priority;
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}
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last_prio = prio;
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/* Call all the hooks with that priority */
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for (p = start; p < end; p++) {
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if (p->priority == prio) {
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called++;
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p->routine();
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}
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}
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}
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}
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void hook_task(void)
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{
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while (1) {
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uint64_t t = get_time().val;
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hook_notify(HOOK_TICK);
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/* Use up the rest of our hook tick interval */
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t = get_time().val - t;
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if (t < HOOK_TICK_INTERVAL)
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usleep(HOOK_TICK_INTERVAL - t);
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}
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}
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