mirror of
https://github.com/hardkernel/linux.git
synced 2026-06-10 21:07:02 +09:00
watchdog: add tegra_wdt driver
add a driver for the hardware watchdog timer embedded in NVIDIA Tegra SoCs Change-Id: I45bc829f26f350143d5a07e1f4ddc46d24f3a54c Signed-off-by: Gary King <gking@nvidia.com>
This commit is contained in:
Gary King
@@ -195,6 +195,17 @@ config MPCORE_WATCHDOG
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To compile this driver as a module, choose M here: the
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module will be called mpcore_wdt.
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config TEGRA_WATCHDOG
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tristate "Tegra watchdog"
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depends on ARCH_TEGRA
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help
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Say Y here to include support for the watchdog timer
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embedded in NVIDIA Tegra SoCs.
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To compile this driver as a module, choose M here: the
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module will be called tegra_wdt.
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config EP93XX_WATCHDOG
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tristate "EP93xx Watchdog"
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depends on ARCH_EP93XX
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@@ -38,6 +38,7 @@ obj-$(CONFIG_KS8695_WATCHDOG) += ks8695_wdt.o
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obj-$(CONFIG_S3C2410_WATCHDOG) += s3c2410_wdt.o
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obj-$(CONFIG_SA1100_WATCHDOG) += sa1100_wdt.o
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obj-$(CONFIG_MPCORE_WATCHDOG) += mpcore_wdt.o
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obj-$(CONFIG_TEGRA_WATCHDOG) += tegra_wdt.o
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obj-$(CONFIG_EP93XX_WATCHDOG) += ep93xx_wdt.o
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obj-$(CONFIG_PNX4008_WATCHDOG) += pnx4008_wdt.o
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obj-$(CONFIG_IOP_WATCHDOG) += iop_wdt.o
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381
drivers/watchdog/tegra_wdt.c
Normal file
381
drivers/watchdog/tegra_wdt.c
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@@ -0,0 +1,381 @@
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/*
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* drivers/watchdog/tegra_wdt.c
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*
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* watchdog driver for NVIDIA tegra internal watchdog
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*
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* Copyright (c) 2010, NVIDIA Corporation.
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*
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* based on drivers/watchdog/softdog.c and drivers/watchdog/omap_wdt.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/fs.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/miscdevice.h>
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#include <linux/notifier.h>
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#include <linux/platform_device.h>
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#include <linux/reboot.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/uaccess.h>
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#include <linux/watchdog.h>
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/* minimum and maximum watchdog trigger periods, in seconds */
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#define MIN_WDT_PERIOD 5
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#define MAX_WDT_PERIOD 1000
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#define TIMER_PTV 0x0
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#define TIMER_EN (1 << 31)
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#define TIMER_PERIODIC (1 << 30)
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#define TIMER_PCR 0x4
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#define TIMER_PCR_INTR (1 << 30)
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#define WDT_EN (1 << 5)
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#define WDT_SEL_TMR1 (0 << 4)
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#define WDT_SYS_RST (1 << 2)
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static int heartbeat = 60;
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struct tegra_wdt {
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struct miscdevice miscdev;
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struct notifier_block notifier;
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struct resource *res_src;
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struct resource *res_wdt;
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unsigned long users;
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void __iomem *wdt_source;
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void __iomem *wdt_timer;
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int irq;
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int timeout;
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bool enabled;
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};
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static struct tegra_wdt *tegra_wdt_dev;
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static void tegra_wdt_set_timeout(struct tegra_wdt *wdt, int sec)
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{
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u32 ptv, src;
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ptv = readl(wdt->wdt_timer + TIMER_PTV);
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src = readl(wdt->wdt_source);
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writel(0, wdt->wdt_source);
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wdt->timeout = clamp(sec, MIN_WDT_PERIOD, MAX_WDT_PERIOD);
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if (ptv & TIMER_EN) {
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/* since the watchdog reset occurs when a second interrupt
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* is asserted before the first is processed, program the
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* timer period to one-half of the watchdog period */
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ptv = wdt->timeout * 1000000ul / 2;
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ptv |= (TIMER_EN | TIMER_PERIODIC);
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writel(ptv, wdt->wdt_timer + TIMER_PTV);
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}
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writel(src, wdt->wdt_source);
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}
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static void tegra_wdt_enable(struct tegra_wdt *wdt)
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{
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u32 val;
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val = wdt->timeout * 1000000ul / 2;
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val |= (TIMER_EN | TIMER_PERIODIC);
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writel(val, wdt->wdt_timer + TIMER_PTV);
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val = WDT_EN | WDT_SEL_TMR1 | WDT_SYS_RST;
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writel(val, wdt->wdt_source);
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}
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static void tegra_wdt_disable(struct tegra_wdt *wdt)
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{
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writel(0, wdt->wdt_source);
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writel(0, wdt->wdt_timer + TIMER_PTV);
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}
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static irqreturn_t tegra_wdt_interrupt(int irq, void *dev_id)
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{
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struct tegra_wdt *wdt = dev_id;
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writel(TIMER_PCR_INTR, wdt->wdt_timer + TIMER_PCR);
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return IRQ_HANDLED;
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}
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static int tegra_wdt_notify(struct notifier_block *this,
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unsigned long code, void *dev)
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{
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struct tegra_wdt *wdt = container_of(this, struct tegra_wdt, notifier);
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if (code == SYS_DOWN || code == SYS_HALT)
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tegra_wdt_disable(wdt);
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return NOTIFY_DONE;
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}
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static int tegra_wdt_open(struct inode *inode, struct file *file)
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{
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struct miscdevice *miscdev = file->private_data;
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struct tegra_wdt *wdt = dev_get_drvdata(miscdev->parent);
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if (test_and_set_bit(1, &wdt->users))
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return -EBUSY;
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wdt->enabled = true;
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tegra_wdt_set_timeout(wdt, heartbeat);
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tegra_wdt_enable(wdt);
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file->private_data = wdt;
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return nonseekable_open(inode, file);
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}
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static int tegra_wdt_release(struct inode *inode, struct file *file)
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{
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struct tegra_wdt *wdt = file->private_data;
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#ifndef CONFIG_WATCHDOG_NOWAYOUT
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tegra_wdt_disable(wdt);
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wdt->enabled = false;
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#endif
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wdt->users = 0;
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return 0;
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}
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static long tegra_wdt_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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struct tegra_wdt *wdt = file->private_data;
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static DEFINE_SPINLOCK(lock);
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int new_timeout;
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static const struct watchdog_info ident = {
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.identity = "Tegra Watchdog",
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.options = WDIOF_SETTIMEOUT,
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.firmware_version = 0,
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};
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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return copy_to_user((struct watchdog_info __user *)arg, &ident,
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sizeof(ident));
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case WDIOC_GETSTATUS:
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case WDIOC_GETBOOTSTATUS:
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return put_user(0, (int __user *)arg);
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case WDIOC_KEEPALIVE:
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return 0;
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case WDIOC_SETTIMEOUT:
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if (get_user(new_timeout, (int __user *)arg))
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return -EFAULT;
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spin_lock(&lock);
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tegra_wdt_disable(wdt);
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tegra_wdt_set_timeout(wdt, new_timeout);
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tegra_wdt_enable(wdt);
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spin_unlock(&lock);
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case WDIOC_GETTIMEOUT:
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return put_user(wdt->timeout, (int __user *)arg);
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default:
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return -ENOTTY;
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}
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}
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static ssize_t tegra_wdt_write(struct file *file, const char __user *data,
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size_t len, loff_t *ppos)
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{
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return len;
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}
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static const struct file_operations tegra_wdt_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = tegra_wdt_write,
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.unlocked_ioctl = tegra_wdt_ioctl,
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.open = tegra_wdt_open,
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.release = tegra_wdt_release,
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};
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static int tegra_wdt_probe(struct platform_device *pdev)
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{
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struct resource *res_src, *res_wdt, *res_irq;
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struct tegra_wdt *wdt;
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int ret = 0;
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if (pdev->id != -1) {
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dev_err(&pdev->dev, "only id -1 supported\n");
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return -ENODEV;
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}
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if (tegra_wdt_dev != NULL) {
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dev_err(&pdev->dev, "watchdog already registered\n");
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return -EIO;
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}
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res_src = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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res_wdt = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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if (!res_src || !res_wdt || !res_irq) {
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dev_err(&pdev->dev, "incorrect resources\n");
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return -ENOENT;
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}
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wdt = kzalloc(sizeof(*wdt), GFP_KERNEL);
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if (!wdt) {
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dev_err(&pdev->dev, "out of memory\n");
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return -ENOMEM;
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}
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wdt->irq = -1;
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wdt->miscdev.parent = &pdev->dev;
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wdt->miscdev.minor = WATCHDOG_MINOR;
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wdt->miscdev.name = "watchdog";
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wdt->miscdev.fops = &tegra_wdt_fops;
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wdt->notifier.notifier_call = tegra_wdt_notify;
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res_src = request_mem_region(res_src->start, resource_size(res_src),
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pdev->name);
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res_wdt = request_mem_region(res_wdt->start, resource_size(res_wdt),
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pdev->name);
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if (!res_src || !res_wdt) {
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dev_err(&pdev->dev, "unable to request memory resources\n");
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ret = -EBUSY;
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goto fail;
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}
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wdt->wdt_source = ioremap(res_src->start, resource_size(res_src));
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wdt->wdt_timer = ioremap(res_wdt->start, resource_size(res_wdt));
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if (!wdt->wdt_source || !wdt->wdt_timer) {
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dev_err(&pdev->dev, "unable to map registers\n");
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ret = -ENOMEM;
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goto fail;
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}
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tegra_wdt_disable(wdt);
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ret = request_irq(res_irq->start, tegra_wdt_interrupt, IRQF_DISABLED,
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dev_name(&pdev->dev), wdt);
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if (ret) {
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dev_err(&pdev->dev, "unable to configure IRQ\n");
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goto fail;
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}
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wdt->irq = res_irq->start;
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wdt->res_src = res_src;
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wdt->res_wdt = res_wdt;
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wdt->timeout = heartbeat;
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ret = register_reboot_notifier(&wdt->notifier);
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if (ret) {
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dev_err(&pdev->dev, "cannot register reboot notifier\n");
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goto fail;
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}
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ret = misc_register(&wdt->miscdev);
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if (ret) {
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dev_err(&pdev->dev, "failed to register misc device\n");
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unregister_reboot_notifier(&wdt->notifier);
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goto fail;
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}
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platform_set_drvdata(pdev, wdt);
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tegra_wdt_dev = wdt;
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return 0;
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fail:
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if (wdt->irq != -1)
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free_irq(wdt->irq, wdt);
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if (wdt->wdt_source)
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iounmap(wdt->wdt_source);
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if (wdt->wdt_timer)
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iounmap(wdt->wdt_timer);
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if (res_src)
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release_mem_region(res_src->start, resource_size(res_src));
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if (res_wdt)
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release_mem_region(res_wdt->start, resource_size(res_wdt));
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kfree(wdt);
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return ret;
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}
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static int tegra_wdt_remove(struct platform_device *pdev)
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{
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struct tegra_wdt *wdt = platform_get_drvdata(pdev);
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tegra_wdt_disable(wdt);
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unregister_reboot_notifier(&wdt->notifier);
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misc_deregister(&wdt->miscdev);
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free_irq(wdt->irq, wdt);
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iounmap(wdt->wdt_source);
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iounmap(wdt->wdt_timer);
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release_mem_region(wdt->res_src->start, resource_size(wdt->res_src));
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release_mem_region(wdt->res_wdt->start, resource_size(wdt->res_wdt));
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kfree(wdt);
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tegra_wdt_dev = NULL;
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return 0;
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}
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static int tegra_wdt_suspend(struct platform_device *pdev, pm_message_t state)
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{
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struct tegra_wdt *wdt = platform_get_drvdata(pdev);
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tegra_wdt_disable(wdt);
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return 0;
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}
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static int tegra_wdt_resume(struct platform_device *pdev)
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{
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struct tegra_wdt *wdt = platform_get_drvdata(pdev);
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if (wdt->enabled)
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tegra_wdt_enable(wdt);
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return 0;
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}
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static struct platform_driver tegra_wdt_driver = {
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.probe = tegra_wdt_probe,
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.remove = __devexit_p(tegra_wdt_remove),
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.suspend = tegra_wdt_suspend,
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.resume = tegra_wdt_resume,
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.driver = {
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.owner = THIS_MODULE,
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.name = "tegra_wdt",
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},
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};
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static int __init tegra_wdt_init(void)
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{
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return platform_driver_register(&tegra_wdt_driver);
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}
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static void __exit tegra_wdt_exit(void)
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{
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platform_driver_unregister(&tegra_wdt_driver);
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}
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module_init(tegra_wdt_init);
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module_exit(tegra_wdt_exit);
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MODULE_AUTHOR("NVIDIA Corporation");
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MODULE_DESCRIPTION("Tegra Watchdog Driver");
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module_param(heartbeat, int, 0);
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MODULE_PARM_DESC(heartbeat,
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"Watchdog heartbeat period in seconds");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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MODULE_ALIAS("platform:tegra_wdt");
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Reference in New Issue
Block a user