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6e157818c1
Currently if an interrupt is pending before it is enabled the interrupt will fire immediately. In most cases this is fine, but if we want to use the interrupt to trigger something like waking the AP it should be sure that it won't immediately fire once enabled. For example: on the Eve board we have the trackpad interrupt run to the AP and the EC in order to support wake from Deep S3 (magic AP state that only the EC can wake it from). This interrupt is used in S0 by the AP while ignored by the EC, and then enabled on the transition to S3 in order to be able to wake. Since it has been active the interrupt may be pending in the EC (depending on the chip), which can result in the interrupt firing immediately and waking the AP. BUG=chrome-os-partner:62224 BRANCH=none TEST=This has been functionally tested on npcx only as that is what I have a use case and system for, the others compile and look right but have not been directly tested. Change-Id: I9e0877d99e7f09f4c30bf9861fbad81c12c059ad Signed-off-by: Duncan Laurie <dlaurie@google.com> Reviewed-on: https://chromium-review.googlesource.com/446962 Reviewed-by: Randall Spangler <rspangler@chromium.org>
79 lines
1.7 KiB
C
79 lines
1.7 KiB
C
/* Copyright (c) 2013 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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/* GPIO module for emulator */
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#include "console.h"
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#include "common.h"
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#include "gpio.h"
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#include "timer.h"
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#include "util.h"
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static int gpio_values[GPIO_COUNT];
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static int gpio_interrupt_enabled[GPIO_COUNT];
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test_mockable void gpio_pre_init(void)
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{
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/* Nothing */
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}
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test_mockable int gpio_get_level(enum gpio_signal signal)
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{
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return gpio_values[signal];
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}
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static int gpio_interrupt_check(uint32_t flags, int old, int new)
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{
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if ((flags & GPIO_INT_F_RISING) && old == 0 && new == 1)
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return 1;
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if ((flags & GPIO_INT_F_FALLING) && old == 1 && new == 0)
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return 1;
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if ((flags & GPIO_INT_F_LOW) && new == 0)
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return 1;
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if ((flags & GPIO_INT_F_HIGH) && new == 1)
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return 1;
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return 0;
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}
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test_mockable void gpio_set_level(enum gpio_signal signal, int value)
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{
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const struct gpio_info *g = gpio_list + signal;
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const uint32_t flags = g->flags;
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const int old_value = gpio_values[signal];
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void (*ih)(enum gpio_signal signal) = gpio_irq_handlers[signal];
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gpio_values[signal] = value;
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if (signal >= GPIO_IH_COUNT || !gpio_interrupt_enabled[signal])
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return;
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if (gpio_interrupt_check(flags, old_value, value))
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ih(signal);
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}
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test_mockable int gpio_enable_interrupt(enum gpio_signal signal)
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{
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gpio_interrupt_enabled[signal] = 1;
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return EC_SUCCESS;
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}
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test_mockable int gpio_clear_pending_interrupt(enum gpio_signal signal)
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{
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return EC_SUCCESS;
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}
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test_mockable void gpio_set_flags_by_mask(uint32_t port, uint32_t mask,
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uint32_t flags)
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{
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/* Nothing */
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}
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test_mockable void gpio_set_alternate_function(uint32_t port, uint32_t mask,
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int func)
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{
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/* Nothing */
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}
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