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OpenCellular/chip/mec1322/gpio.c
Duncan Laurie 6e157818c1 gpio: Add function to clear pending interrupt 
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>
2017-03-01 16:36:24 -08:00

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/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* GPIO module for MEC1322 */
#include "common.h"
#include "gpio.h"
#include "hooks.h"
#include "registers.h"
#include "system.h"
#include "task.h"
#include "timer.h"
#include "util.h"
struct gpio_int_mapping {
int8_t girq_id;
int8_t port_offset;
};
/* Mapping from GPIO port to GIRQ info */
static const struct gpio_int_mapping int_map[22] = {
{11, 0}, {11, 0}, {11, 0}, {11, 0},
{10, 4}, {10, 4}, {10, 4}, {-1, -1},
{-1, -1}, {-1, -1}, {9, 10}, {9, 10},
{9, 10}, {9, 10}, {8, 14}, {8, 14},
{8, 14}, {-1, -1}, {-1, -1}, {-1, -1},
{20, 20}, {20, 20}
};
void gpio_set_alternate_function(uint32_t port, uint32_t mask, int func)
{
int i;
uint32_t val;
while (mask) {
i = __builtin_ffs(mask) - 1;
val = MEC1322_GPIO_CTL(port, i);
val &= ~((1 << 12) | (1 << 13));
/* mux_control = 0 indicates GPIO */
if (func > 0)
val |= (func & 0x3) << 12;
MEC1322_GPIO_CTL(port, i) = val;
mask &= ~(1 << i);
}
}
test_mockable int gpio_get_level(enum gpio_signal signal)
{
uint32_t mask = gpio_list[signal].mask;
int i;
uint32_t val;
if (mask == 0)
return 0;
i = GPIO_MASK_TO_NUM(mask);
val = MEC1322_GPIO_CTL(gpio_list[signal].port, i);
return (val & (1 << 24)) ? 1 : 0;
}
void gpio_set_level(enum gpio_signal signal, int value)
{
uint32_t mask = gpio_list[signal].mask;
int i;
if (mask == 0)
return;
i = GPIO_MASK_TO_NUM(mask);
if (value)
MEC1322_GPIO_CTL(gpio_list[signal].port, i) |= (1 << 16);
else
MEC1322_GPIO_CTL(gpio_list[signal].port, i) &= ~(1 << 16);
}
void gpio_set_flags_by_mask(uint32_t port, uint32_t mask, uint32_t flags)
{
int i;
uint32_t val;
while (mask) {
i = GPIO_MASK_TO_NUM(mask);
mask &= ~(1 << i);
val = MEC1322_GPIO_CTL(port, i);
/*
* Select open drain first, so that we don't glitch the signal
* when changing the line to an output.
*/
if (flags & GPIO_OPEN_DRAIN)
val |= (1 << 8);
else
val &= ~(1 << 8);
if (flags & GPIO_OUTPUT) {
val |= (1 << 9);
val &= ~(1 << 10);
} else {
val &= ~(1 << 9);
val |= (1 << 10);
}
/* Handle pullup / pulldown */
if (flags & GPIO_PULL_UP)
val = (val & ~0x3) | 0x1;
else if (flags & GPIO_PULL_DOWN)
val = (val & ~0x3) | 0x2;
else
val &= ~0x3;
/* Set up interrupt */
if (flags & (GPIO_INT_F_RISING | GPIO_INT_F_FALLING))
val |= (1 << 7);
else
val &= ~(1 << 7);
val &= ~(0x7 << 4);
if ((flags & GPIO_INT_F_RISING) && (flags & GPIO_INT_F_FALLING))
val |= 0x7 << 4;
else if (flags & GPIO_INT_F_RISING)
val |= 0x5 << 4;
else if (flags & GPIO_INT_F_FALLING)
val |= 0x6 << 4;
else if (flags & GPIO_INT_F_HIGH)
val |= 0x1 << 4;
else if (!(flags & GPIO_INT_F_LOW)) /* No interrupt flag set */
val |= 0x4 << 4;
/* Set up level */
if (flags & GPIO_HIGH)
val |= (1 << 16);
else if (flags & GPIO_LOW)
val &= ~(1 << 16);
MEC1322_GPIO_CTL(port, i) = val;
}
}
int gpio_enable_interrupt(enum gpio_signal signal)
{
int i, port, girq_id, bit_id;
if (gpio_list[signal].mask == 0)
return EC_SUCCESS;
i = GPIO_MASK_TO_NUM(gpio_list[signal].mask);
port = gpio_list[signal].port;
girq_id = int_map[port].girq_id;
bit_id = (port - int_map[port].port_offset) * 8 + i;
MEC1322_INT_ENABLE(girq_id) |= (1 << bit_id);
MEC1322_INT_BLK_EN |= (1 << girq_id);
return EC_SUCCESS;
}
int gpio_disable_interrupt(enum gpio_signal signal)
{
int i, port, girq_id, bit_id;
if (gpio_list[signal].mask == 0)
return EC_SUCCESS;
i = GPIO_MASK_TO_NUM(gpio_list[signal].mask);
port = gpio_list[signal].port;
girq_id = int_map[port].girq_id;
bit_id = (port - int_map[port].port_offset) * 8 + i;
MEC1322_INT_DISABLE(girq_id) = (1 << bit_id);
return EC_SUCCESS;
}
int gpio_clear_pending_interrupt(enum gpio_signal signal)
{
int i, port, girq_id, bit_id;
if (gpio_list[signal].mask == 0)
return EC_SUCCESS;
i = GPIO_MASK_TO_NUM(gpio_list[signal].mask);
port = gpio_list[signal].port;
girq_id = int_map[port].girq_id;
bit_id = (port - int_map[port].port_offset) * 8 + i;
/* Clear interrupt source sticky status bit even if not enabled */
MEC1322_INT_SOURCE(girq_id) |= 1 << bit_id;
return EC_SUCCESS;
}
void gpio_pre_init(void)
{
int i;
int flags;
int is_warm = system_is_reboot_warm();
const struct gpio_info *g = gpio_list;
for (i = 0; i < GPIO_COUNT; i++, g++) {
flags = g->flags;
if (flags & GPIO_DEFAULT)
continue;
/*
* If this is a warm reboot, don't set the output levels or
* we'll shut off the AP.
*/
if (is_warm)
flags &= ~(GPIO_LOW | GPIO_HIGH);
gpio_set_flags_by_mask(g->port, g->mask, flags);
/* Use as GPIO, not alternate function */
gpio_set_alternate_function(g->port, g->mask, -1);
}
}
/* Clear any interrupt flags before enabling GPIO interrupt */
#define ENABLE_GPIO_GIRQ(x) \
do { \
MEC1322_INT_SOURCE(x) |= MEC1322_INT_RESULT(x); \
task_enable_irq(MEC1322_IRQ_GIRQ ## x); \
} while (0)
static void gpio_init(void)
{
ENABLE_GPIO_GIRQ(8);
ENABLE_GPIO_GIRQ(9);
ENABLE_GPIO_GIRQ(10);
ENABLE_GPIO_GIRQ(11);
ENABLE_GPIO_GIRQ(20);
}
DECLARE_HOOK(HOOK_INIT, gpio_init, HOOK_PRIO_DEFAULT);
/*****************************************************************************/
/* Interrupt handlers */
/**
* Handler for each GIRQ interrupt. This reads and clears the interrupt bits for
* the GIRQ interrupt, then finds and calls the corresponding GPIO interrupt
* handlers.
*
* @param girq GIRQ index
* @param port_offset GPIO port offset for the given GIRQ
*/
static void gpio_interrupt(int girq, int port_offset)
{
int i, bit;
const struct gpio_info *g = gpio_list;
uint32_t sts = MEC1322_INT_RESULT(girq);
MEC1322_INT_SOURCE(girq) |= sts;
for (i = 0; i < GPIO_IH_COUNT && sts; ++i, ++g) {
bit = (g->port - port_offset) * 8 + __builtin_ffs(g->mask) - 1;
if (sts & (1 << bit))
gpio_irq_handlers[i](i);
sts &= ~(1 << bit);
}
}
#define GPIO_IRQ_FUNC(irqfunc, girq, port_offset) \
void irqfunc(void) \
{ \
gpio_interrupt(girq, port_offset); \
}
GPIO_IRQ_FUNC(__girq_8_interrupt, 8, 14);
GPIO_IRQ_FUNC(__girq_9_interrupt, 9, 10);
GPIO_IRQ_FUNC(__girq_10_interrupt, 10, 4);
GPIO_IRQ_FUNC(__girq_11_interrupt, 11, 0);
GPIO_IRQ_FUNC(__girq_20_interrupt, 20, 20);
#undef GPIO_IRQ_FUNC
/*
* Declare IRQs. Nesting this macro inside the GPIO_IRQ_FUNC macro works
* poorly because DECLARE_IRQ() stringizes its inputs.
*/
DECLARE_IRQ(MEC1322_IRQ_GIRQ8, __girq_8_interrupt, 1);
DECLARE_IRQ(MEC1322_IRQ_GIRQ9, __girq_9_interrupt, 1);
DECLARE_IRQ(MEC1322_IRQ_GIRQ10, __girq_10_interrupt, 1);
DECLARE_IRQ(MEC1322_IRQ_GIRQ11, __girq_11_interrupt, 1);
DECLARE_IRQ(MEC1322_IRQ_GIRQ20, __girq_20_interrupt, 1);
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