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/*
* Tegra Wakeups for NVIDIA SoCs Tegra
*
* Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
*
* Author: Laxman Dewangan <ldewangan@nvidia.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/irqchip/tegra.h>
#include <linux/system-wakeup.h>
#include <mach/irqs.h>
#include <mach/gpio-tegra.h>
int *tegra_gpio_wake_table;
EXPORT_SYMBOL_GPL(tegra_gpio_wake_table);
int *tegra_irq_wake_table;
EXPORT_SYMBOL_GPL(tegra_irq_wake_table);
int tegra_wake_table_len;
EXPORT_SYMBOL_GPL(tegra_wake_table_len);
static int last_gpio = -1;
int tegra_set_wake_gpio(unsigned int wake, int gpio)
{
if (wake >= tegra_wake_table_len)
return -EINVAL;
tegra_irq_wake_table[wake] = -EAGAIN;
tegra_gpio_wake_table[wake] = gpio;
return 0;
}
int tegra_set_wake_irq(unsigned int wake, int irq)
{
if (wake >= tegra_wake_table_len)
return -EINVAL;
tegra_irq_wake_table[wake] = irq;
return 0;
}
int tegra_gpio_to_wake(int gpio)
{
int i;
for (i = 0; i < tegra_wake_table_len; i++) {
if (tegra_gpio_wake_table[i] == gpio) {
pr_info("gpio wake%d for gpio=%d\n", i, gpio);
last_gpio = i;
return i;
}
}
return -EINVAL;
}
void tegra_irq_to_wake(int irq, int *wak_list, int *wak_size)
{
int i;
int bank_irq;
*wak_size = 0;
for (i = 0; i < tegra_wake_table_len; i++) {
if (tegra_irq_wake_table[i] == irq) {
pr_info("Wake%d for irq=%d\n", i, irq);
wak_list[*wak_size] = i;
*wak_size = *wak_size + 1;
}
}
if (*wak_size)
goto out;
/* The gpio set_wake code bubbles the set_wake call up to the irq
* set_wake code. This insures that the nested irq set_wake call
* succeeds, even though it doesn't have to do any pm setup for the
* bank.
*
* This is very fragile - there's no locking, so two callers could
* cause issues with this.
*/
if (last_gpio < 0)
goto out;
bank_irq = tegra_gpio_get_bank_int_nr(tegra_gpio_wake_table[last_gpio]);
if (bank_irq == irq) {
pr_info("gpio bank wake found: wake%d for irq=%d\n", i, irq);
wak_list[*wak_size] = last_gpio;
*wak_size = 1;
}
out:
return;
}
int tegra_wake_to_irq(int wake)
{
int ret;
if (wake < 0)
return -EINVAL;
if (wake >= tegra_wake_table_len)
return -EINVAL;
ret = tegra_irq_wake_table[wake];
if (ret == -EAGAIN) {
ret = tegra_gpio_wake_table[wake];
if (ret != -EINVAL)
ret = gpio_to_irq(ret);
}
return ret;
}
int tegra_set_wake_source(int wake, int irq)
{
if (wake < 0)
return -EINVAL;
if (wake >= tegra_wake_table_len)
return -EINVAL;
tegra_irq_wake_table[wake] = irq;
return 0;
}
int tegra_disable_wake_source(int wake)
{
return tegra_set_wake_source(wake, -EINVAL);
}
int get_wakeup_reason_irq(void)
{
unsigned long long wake_status = tegra_read_pmc_wake_status();
unsigned long long mask_ll = 1ULL;
int irq;
struct irq_desc *desc;
int i;
for (i = 0; i < tegra_wake_table_len; ++i) {
if (mask_ll & wake_status) {
irq = tegra_wake_to_irq(i);
if (!irq)
continue;
desc = irq_to_desc(irq);
if (!desc || !desc->action || !desc->action->name)
continue;
return irq;
}
mask_ll <<= 1;
}
return -EINVAL;
}
EXPORT_SYMBOL_GPL(get_wakeup_reason_irq);
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