/*
* omap_wdt.c
*
* Watchdog driver for the TI OMAP 16xx & 24xx/34xx 32KHz (non-secure) watchdog
*
* Author: MontaVista Software, Inc.
* <[email protected]> or <[email protected]>
*
* 2003 (c) MontaVista Software, Inc. This file is licensed under the
* terms of the GNU General Public License version 2. This program is
* licensed "as is" without any warranty of any kind, whether express
* or implied.
*
* History:
*
* 20030527: George G. Davis <[email protected]>
* Initially based on linux-2.4.19-rmk7-pxa1/drivers/char/sa1100_wdt.c
* (c) Copyright 2000 Oleg Drokin <[email protected]>
* Based on SoftDog driver by Alan Cox <[email protected]>
*
* Copyright (c) 2004 Texas Instruments.
* 1. Modified to support OMAP1610 32-KHz watchdog timer
* 2. Ported to 2.6 kernel
*
* Copyright (c) 2005 David Brownell
* Use the driver model and standard identifiers; handle bigger timeouts.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/watchdog.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/moduleparam.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/platform_data/omap-wd-timer.h>
#include "omap_wdt.h"
static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
"(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
static unsigned timer_margin;
module_param(timer_margin, uint, 0);
MODULE_PARM_DESC(timer_margin, "initial watchdog timeout (in seconds)");
struct omap_wdt_dev {
void __iomem *base; /* physical */
struct device *dev;
bool omap_wdt_users;
struct resource *mem;
int wdt_trgr_pattern;
struct mutex lock; /* to avoid races with PM */
};
static void omap_wdt_reload(struct omap_wdt_dev *wdev)
{
void __iomem *base = wdev->base;
/* wait for posted write to complete */
while ((readl_relaxed(base + OMAP_WATCHDOG_WPS)) & 0x08)
cpu_relax();
wdev->wdt_trgr_pattern = ~wdev->wdt_trgr_pattern;
writel_relaxed(wdev->wdt_trgr_pattern, (base + OMAP_WATCHDOG_TGR));
/* wait for posted write to complete */
while ((readl_relaxed(base + OMAP_WATCHDOG_WPS)) & 0x08)
cpu_relax();
/* reloaded WCRR from WLDR */
}
static void omap_wdt_enable(struct omap_wdt_dev *wdev)
{
void __iomem *base = wdev->base;
/* Sequence to enable the watchdog */
writel_relaxed(0xBBBB, base + OMAP_WATCHDOG_SPR);
while ((readl_relaxed(base + OMAP_WATCHDOG_WPS)) & 0x10)
cpu_relax();
writel_relaxed(0x4444, base + OMAP_WATCHDOG_SPR);
while ((readl_relaxed(base + OMAP_WATCHDOG_WPS)) & 0x10)
cpu_relax();
}
static void omap_wdt_disable(struct omap_wdt_dev *wdev)
{
void __iomem *base = wdev->base;
/* sequence required to disable watchdog */
writel_relaxed(0xAAAA, base + OMAP_WATCHDOG_SPR); /* TIMER_MODE */
while (readl_relaxed(base + OMAP_WATCHDOG_WPS) & 0x10)
cpu_relax();
writel_relaxed(0x5555, base + OMAP_WATCHDOG_SPR); /* TIMER_MODE */
while (readl_relaxed(base + OMAP_WATCHDOG_WPS) & 0x10)
cpu_relax();
}
static void omap_wdt_set_timer(struct omap_wdt_dev *wdev,
unsigned int timeout)
{
u32 pre_margin = GET_WLDR_VAL(timeout);
void __iomem *base = wdev->base;
/* just count up at 32 KHz */
while (readl_relaxed(base + OMAP_WATCHDOG_WPS) & 0x04)
cpu_relax();
writel_relaxed(pre_margin, base + OMAP_WATCHDOG_LDR);
while (readl_relaxed(base + OMAP_WATCHDOG_WPS) & 0x04)
cpu_relax();
}
static int omap_wdt_start(struct watchdog_device *wdog)
{
struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
void __iomem *base = wdev->base;
mutex_lock(&wdev->lock);
wdev->omap_wdt_users = true;
pm_runtime_get_sync(wdev->dev);
/* initialize prescaler */
while (readl_relaxed(base + OMAP_WATCHDOG_WPS) & 0x01)
cpu_relax();
writel_relaxed((1 << 5) | (PTV << 2), base + OMAP_WATCHDOG_CNTRL);
while (readl_relaxed(base + OMAP_WATCHDOG_WPS) & 0x01)
cpu_relax();
omap_wdt_set_timer(wdev, wdog->timeout);
omap_wdt_reload(wdev); /* trigger loading of new timeout value */
omap_wdt_enable(wdev);
mutex_unlock(&wdev->lock);
return 0;
}
static int omap_wdt_stop(struct watchdog_device *wdog)
{
struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
mutex_lock(&wdev->lock);
omap_wdt_disable(wdev);
pm_runtime_put_sync(wdev->dev);
wdev->omap_wdt_users = false;
mutex_unlock(&wdev->lock);
return 0;
}
static int omap_wdt_ping(struct watchdog_device *wdog)
{
struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
mutex_lock(&wdev->lock);
omap_wdt_reload(wdev);
mutex_unlock(&wdev->lock);
return 0;
}
static int omap_wdt_set_timeout(struct watchdog_device *wdog,
unsigned int timeout)
{
struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
mutex_lock(&wdev->lock);
omap_wdt_disable(wdev);
omap_wdt_set_timer(wdev, timeout);
omap_wdt_enable(wdev);
omap_wdt_reload(wdev);
wdog->timeout = timeout;
mutex_unlock(&wdev->lock);
return 0;
}
static const struct watchdog_info omap_wdt_info = {
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
.identity = "OMAP Watchdog",
};
static const struct watchdog_ops omap_wdt_ops = {
.owner = THIS_MODULE,
.start = omap_wdt_start,
.stop = omap_wdt_stop,
.ping = omap_wdt_ping,
.set_timeout = omap_wdt_set_timeout,
};
static int omap_wdt_probe(struct platform_device *pdev)
{
struct omap_wd_timer_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct watchdog_device *omap_wdt;
struct resource *res, *mem;
struct omap_wdt_dev *wdev;
u32 rs;
int ret;
omap_wdt = devm_kzalloc(&pdev->dev, sizeof(*omap_wdt), GFP_KERNEL);
if (!omap_wdt)
return -ENOMEM;
/* reserve static register mappings */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENOENT;
mem = devm_request_mem_region(&pdev->dev, res->start,
resource_size(res), pdev->name);
if (!mem)
return -EBUSY;
wdev = devm_kzalloc(&pdev->dev, sizeof(*wdev), GFP_KERNEL);
if (!wdev)
return -ENOMEM;
wdev->omap_wdt_users = false;
wdev->mem = mem;
wdev->dev = &pdev->dev;
wdev->wdt_trgr_pattern = 0x1234;
mutex_init(&wdev->lock);
wdev->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
if (!wdev->base)
return -ENOMEM;
omap_wdt->info = &omap_wdt_info;
omap_wdt->ops = &omap_wdt_ops;
omap_wdt->min_timeout = TIMER_MARGIN_MIN;
omap_wdt->max_timeout = TIMER_MARGIN_MAX;
if (timer_margin >= TIMER_MARGIN_MIN &&
timer_margin <= TIMER_MARGIN_MAX)
omap_wdt->timeout = timer_margin;
else
omap_wdt->timeout = TIMER_MARGIN_DEFAULT;
watchdog_set_drvdata(omap_wdt, wdev);
watchdog_set_nowayout(omap_wdt, nowayout);
platform_set_drvdata(pdev, omap_wdt);
pm_runtime_enable(wdev->dev);
pm_runtime_get_sync(wdev->dev);
if (pdata && pdata->read_reset_sources)
rs = pdata->read_reset_sources();
else
rs = 0;
omap_wdt->bootstatus = (rs & (1 << OMAP_MPU_WD_RST_SRC_ID_SHIFT)) ?
WDIOF_CARDRESET : 0;
omap_wdt_disable(wdev);
ret = watchdog_register_device(omap_wdt);
if (ret) {
pm_runtime_disable(wdev->dev);
return ret;
}
pr_info("OMAP Watchdog Timer Rev 0x%02x: initial timeout %d sec\n",
readl_relaxed(wdev->base + OMAP_WATCHDOG_REV) & 0xFF,
omap_wdt->timeout);
pm_runtime_put_sync(wdev->dev);
return 0;
}
static void omap_wdt_shutdown(struct platform_device *pdev)
{
struct watchdog_device *wdog = platform_get_drvdata(pdev);
struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
mutex_lock(&wdev->lock);
if (wdev->omap_wdt_users) {
omap_wdt_disable(wdev);
pm_runtime_put_sync(wdev->dev);
}
mutex_unlock(&wdev->lock);
}
static int omap_wdt_remove(struct platform_device *pdev)
{
struct watchdog_device *wdog = platform_get_drvdata(pdev);
struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
pm_runtime_disable(wdev->dev);
watchdog_unregister_device(wdog);
return 0;
}
#
omap_wdt.rar_timer omap
版权申诉
55 浏览量
2022-09-23
00:26:15
上传
评论
收藏 4KB RAR 举报
局外狗
- 粉丝: 66
- 资源: 1万+
最新资源
- 基于matlab实现 powell算法 用matlab实现,使用方法内附详细说明.rar
- 基于matlab的手写字体识别程序,并对结果进行保存.rar
- 基于c语言指纹识别demo代码 包括了指纹图像方向图计算、频率计算、gabor滤波器增强,细化,特征点提取,特征点匹配.rar
- 基于c++NSGA-2思想的多目标优化程序,采用进化算法处理多目标实值优化问题.rar
- Linux系统中常用权限管理命令
- Coello Coello等人提出了MOPSO 该程序基于matlab实现针对测试函数matlab程序
- Linux系统中常用权限管理命令
- AIR-AP1815-K9-ME-8-5-182-0.tar For Cisco AP1815
- 实验七.zip
- ESP8266刷固件软件flash-download-tools-v3.6.5,AT固件,机智云固件
资源上传下载、课程学习等过程中有任何疑问或建议,欢迎提出宝贵意见哦~我们会及时处理!
点击此处反馈