swh:1:snp:c3bf2749e3476071fa748f67b0ffa2fdc5fe49d9
Tip revision: 31880c37c11e28cb81c70757e38392b42e695dc6 authored by Linus Torvalds on 08 April 2013, 03:49:54 UTC
Linux 3.9-rc6
Linux 3.9-rc6
Tip revision: 31880c3
max63xx_wdt.c
/*
* drivers/char/watchdog/max63xx_wdt.c
*
* Driver for max63{69,70,71,72,73,74} watchdog timers
*
* Copyright (C) 2009 Marc Zyngier <maz@misterjones.org>
*
* 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.
*
* This driver assumes the watchdog pins are memory mapped (as it is
* the case for the Arcom Zeus). Should it be connected over GPIOs or
* another interface, some abstraction will have to be introduced.
*/
#include <linux/err.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/slab.h>
#define DEFAULT_HEARTBEAT 60
#define MAX_HEARTBEAT 60
static unsigned int heartbeat = DEFAULT_HEARTBEAT;
static bool nowayout = WATCHDOG_NOWAYOUT;
/*
* Memory mapping: a single byte, 3 first lower bits to select bit 3
* to ping the watchdog.
*/
#define MAX6369_WDSET (7 << 0)
#define MAX6369_WDI (1 << 3)
static DEFINE_SPINLOCK(io_lock);
static int nodelay;
static void __iomem *wdt_base;
/*
* The timeout values used are actually the absolute minimum the chip
* offers. Typical values on my board are slightly over twice as long
* (10s setting ends up with a 25s timeout), and can be up to 3 times
* the nominal setting (according to the datasheet). So please take
* these values with a grain of salt. Same goes for the initial delay
* "feature". Only max6373/74 have a few settings without this initial
* delay (selected with the "nodelay" parameter).
*
* I also decided to remove from the tables any timeout smaller than a
* second, as it looked completly overkill...
*/
/* Timeouts in second */
struct max63xx_timeout {
u8 wdset;
u8 tdelay;
u8 twd;
};
static struct max63xx_timeout max6369_table[] = {
{ 5, 1, 1 },
{ 6, 10, 10 },
{ 7, 60, 60 },
{ },
};
static struct max63xx_timeout max6371_table[] = {
{ 6, 60, 3 },
{ 7, 60, 60 },
{ },
};
static struct max63xx_timeout max6373_table[] = {
{ 2, 60, 1 },
{ 5, 0, 1 },
{ 1, 3, 3 },
{ 7, 60, 10 },
{ 6, 0, 10 },
{ },
};
static struct max63xx_timeout *current_timeout;
static struct max63xx_timeout *
max63xx_select_timeout(struct max63xx_timeout *table, int value)
{
while (table->twd) {
if (value <= table->twd) {
if (nodelay && table->tdelay == 0)
return table;
if (!nodelay)
return table;
}
table++;
}
return NULL;
}
static int max63xx_wdt_ping(struct watchdog_device *wdd)
{
u8 val;
spin_lock(&io_lock);
val = __raw_readb(wdt_base);
__raw_writeb(val | MAX6369_WDI, wdt_base);
__raw_writeb(val & ~MAX6369_WDI, wdt_base);
spin_unlock(&io_lock);
return 0;
}
static int max63xx_wdt_start(struct watchdog_device *wdd)
{
struct max63xx_timeout *entry = watchdog_get_drvdata(wdd);
u8 val;
spin_lock(&io_lock);
val = __raw_readb(wdt_base);
val &= ~MAX6369_WDSET;
val |= entry->wdset;
__raw_writeb(val, wdt_base);
spin_unlock(&io_lock);
/* check for a edge triggered startup */
if (entry->tdelay == 0)
max63xx_wdt_ping(wdd);
return 0;
}
static int max63xx_wdt_stop(struct watchdog_device *wdd)
{
u8 val;
spin_lock(&io_lock);
val = __raw_readb(wdt_base);
val &= ~MAX6369_WDSET;
val |= 3;
__raw_writeb(val, wdt_base);
spin_unlock(&io_lock);
return 0;
}
static const struct watchdog_info max63xx_wdt_info = {
.options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
.identity = "max63xx Watchdog",
};
static const struct watchdog_ops max63xx_wdt_ops = {
.owner = THIS_MODULE,
.start = max63xx_wdt_start,
.stop = max63xx_wdt_stop,
.ping = max63xx_wdt_ping,
};
static struct watchdog_device max63xx_wdt_dev = {
.info = &max63xx_wdt_info,
.ops = &max63xx_wdt_ops,
};
static int max63xx_wdt_probe(struct platform_device *pdev)
{
struct resource *wdt_mem;
struct max63xx_timeout *table;
table = (struct max63xx_timeout *)pdev->id_entry->driver_data;
if (heartbeat < 1 || heartbeat > MAX_HEARTBEAT)
heartbeat = DEFAULT_HEARTBEAT;
dev_info(&pdev->dev, "requesting %ds heartbeat\n", heartbeat);
current_timeout = max63xx_select_timeout(table, heartbeat);
if (!current_timeout) {
dev_err(&pdev->dev, "unable to satisfy heartbeat request\n");
return -EINVAL;
}
dev_info(&pdev->dev, "using %ds heartbeat with %ds initial delay\n",
current_timeout->twd, current_timeout->tdelay);
heartbeat = current_timeout->twd;
wdt_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
wdt_base = devm_ioremap_resource(&pdev->dev, wdt_mem);
if (IS_ERR(wdt_base))
return PTR_ERR(wdt_base);
max63xx_wdt_dev.timeout = heartbeat;
watchdog_set_nowayout(&max63xx_wdt_dev, nowayout);
watchdog_set_drvdata(&max63xx_wdt_dev, current_timeout);
return watchdog_register_device(&max63xx_wdt_dev);
}
static int max63xx_wdt_remove(struct platform_device *pdev)
{
watchdog_unregister_device(&max63xx_wdt_dev);
return 0;
}
static struct platform_device_id max63xx_id_table[] = {
{ "max6369_wdt", (kernel_ulong_t)max6369_table, },
{ "max6370_wdt", (kernel_ulong_t)max6369_table, },
{ "max6371_wdt", (kernel_ulong_t)max6371_table, },
{ "max6372_wdt", (kernel_ulong_t)max6371_table, },
{ "max6373_wdt", (kernel_ulong_t)max6373_table, },
{ "max6374_wdt", (kernel_ulong_t)max6373_table, },
{ },
};
MODULE_DEVICE_TABLE(platform, max63xx_id_table);
static struct platform_driver max63xx_wdt_driver = {
.probe = max63xx_wdt_probe,
.remove = max63xx_wdt_remove,
.id_table = max63xx_id_table,
.driver = {
.name = "max63xx_wdt",
.owner = THIS_MODULE,
},
};
module_platform_driver(max63xx_wdt_driver);
MODULE_AUTHOR("Marc Zyngier <maz@misterjones.org>");
MODULE_DESCRIPTION("max63xx Watchdog Driver");
module_param(heartbeat, int, 0);
MODULE_PARM_DESC(heartbeat,
"Watchdog heartbeat period in seconds from 1 to "
__MODULE_STRING(MAX_HEARTBEAT) ", default "
__MODULE_STRING(DEFAULT_HEARTBEAT));
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
module_param(nodelay, int, 0);
MODULE_PARM_DESC(nodelay,
"Force selection of a timeout setting without initial delay "
"(max6373/74 only, default=0)");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);