155 lines
3.4 KiB
C
155 lines
3.4 KiB
C
/*
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* Copyright (c) 2015 Intel Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <init.h>
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#include <device.h>
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#include <watchdog.h>
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#include <ioapic.h>
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#include "clk.h"
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#include "qm_interrupt.h"
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#include "qm_isr.h"
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#include "qm_wdt.h"
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struct wdt_data {
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struct nano_sem sem;
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};
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#ifdef CONFIG_WDT_QMSI_API_REENTRANCY
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static struct wdt_data wdt_context;
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#define WDT_CONTEXT (&wdt_context)
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static const int reentrancy_protection = 1;
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#else
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#define WDT_CONTEXT (NULL)
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static const int reentrancy_protection;
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#endif /* CONFIG_WDT_QMSI_API_REENTRANCY */
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static void wdt_reentrancy_init(struct device *dev)
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{
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struct wdt_data *context = dev->driver_data;
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if (!reentrancy_protection) {
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return;
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}
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nano_sem_init(&context->sem);
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nano_sem_give(&context->sem);
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}
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static void wdt_critical_region_start(struct device *dev)
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{
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struct wdt_data *context = dev->driver_data;
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if (!reentrancy_protection) {
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return;
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}
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nano_sem_take(&context->sem, TICKS_UNLIMITED);
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}
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static void wdt_critical_region_end(struct device *dev)
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{
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struct wdt_data *context = dev->driver_data;
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if (!reentrancy_protection) {
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return;
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}
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nano_sem_give(&context->sem);
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}
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static void (*user_cb)(struct device *dev);
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static void get_config(struct device *dev, struct wdt_config *cfg)
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{
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cfg->timeout = QM_WDT[QM_WDT_0].wdt_torr;
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cfg->mode = ((QM_WDT[QM_WDT_0].wdt_cr & QM_WDT_MODE) >>
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QM_WDT_MODE_OFFSET);
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cfg->interrupt_fn = user_cb;
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}
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static int set_config(struct device *dev, struct wdt_config *cfg)
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{
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int ret_val = 0;
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qm_wdt_config_t qm_cfg;
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user_cb = cfg->interrupt_fn;
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qm_cfg.timeout = cfg->timeout;
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qm_cfg.mode = (cfg->mode == WDT_MODE_RESET) ?
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QM_WDT_MODE_RESET : QM_WDT_MODE_INTERRUPT_RESET;
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qm_cfg.callback = (void *)user_cb;
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qm_cfg.callback_data = dev;
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wdt_critical_region_start(dev);
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if (qm_wdt_set_config(QM_WDT_0, &qm_cfg)) {
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ret_val = -EIO;
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goto wdt_config_return;
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}
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if (qm_wdt_start(QM_WDT_0)) {
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ret_val = -EIO;
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}
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wdt_config_return:
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wdt_critical_region_end(dev);
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return ret_val;
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}
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static void reload(struct device *dev)
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{
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qm_wdt_reload(QM_WDT_0);
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}
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static void enable(struct device *dev)
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{
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clk_periph_enable(CLK_PERIPH_WDT_REGISTER | CLK_PERIPH_CLK);
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}
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static void disable(struct device *dev)
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{
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clk_periph_disable(CLK_PERIPH_WDT_REGISTER);
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}
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static struct wdt_driver_api api = {
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.enable = enable,
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.disable = disable,
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.get_config = get_config,
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.set_config = set_config,
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.reload = reload,
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};
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static int init(struct device *dev)
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{
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wdt_reentrancy_init(dev);
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IRQ_CONNECT(QM_IRQ_WDT_0, CONFIG_WDT_0_IRQ_PRI,
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qm_wdt_isr_0, 0, IOAPIC_EDGE | IOAPIC_HIGH);
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/* Unmask watchdog interrupt */
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irq_enable(QM_IRQ_WDT_0);
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/* Route watchdog interrupt to Lakemont */
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QM_SCSS_INT->int_watchdog_mask &= ~BIT(0);
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return 0;
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}
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DEVICE_AND_API_INIT(wdt, CONFIG_WDT_0_NAME, init, WDT_CONTEXT, 0,
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PRIMARY, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
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(void *)&api);
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