watchdog: Add support for sp5100 chipset TCO
This driver adds /dev/watchdog support for the AMD sp5100 aka SB7x0 chipsets. It follows the same conventions found in other /dev/watchdog drivers. Signed-off-by: Priyanka Gupta <priyankag@google.com> Signed-off-by: Mike Waychison <mikew@google.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Priyanka Gupta
Wim Van Sebroeck
parent
e13752a1de
commit
15e28bf130
4 changed files with 533 additions and 0 deletions
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@ -418,6 +418,17 @@ config F71808E_WDT
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You can compile this driver directly into the kernel, or use
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it as a module. The module will be called f71808e_wdt.
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config SP5100_TCO
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tristate "AMD/ATI SP5100 TCO Timer/Watchdog"
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depends on X86 && PCI
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---help---
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Hardware watchdog driver for the AMD/ATI SP5100 chipset. The TCO
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(Total Cost of Ownership) timer is a watchdog timer that will reboot
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the machine after its expiration. The expiration time can be
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configured with the "heartbeat" parameter.
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To compile this driver as a module, choose M here: the
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module will be called sp5100_tco.
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config GEODE_WDT
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tristate "AMD Geode CS5535/CS5536 Watchdog"
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@ -68,6 +68,7 @@ obj-$(CONFIG_ADVANTECH_WDT) += advantechwdt.o
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obj-$(CONFIG_ALIM1535_WDT) += alim1535_wdt.o
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obj-$(CONFIG_ALIM7101_WDT) += alim7101_wdt.o
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obj-$(CONFIG_F71808E_WDT) += f71808e_wdt.o
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obj-$(CONFIG_SP5100_TCO) += sp5100_tco.o
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obj-$(CONFIG_GEODE_WDT) += geodewdt.o
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obj-$(CONFIG_SC520_WDT) += sc520_wdt.o
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obj-$(CONFIG_SBC_FITPC2_WATCHDOG) += sbc_fitpc2_wdt.o
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480
drivers/watchdog/sp5100_tco.c
Normal file
480
drivers/watchdog/sp5100_tco.c
Normal file
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@ -0,0 +1,480 @@
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/*
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* sp5100_tco : TCO timer driver for sp5100 chipsets
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*
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* (c) Copyright 2009 Google Inc., All Rights Reserved.
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*
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* Based on i8xx_tco.c:
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* (c) Copyright 2000 kernel concepts <nils@kernelconcepts.de>, All Rights
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* Reserved.
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* http://www.kernelconcepts.de
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* See AMD Publication 43009 "AMD SB700/710/750 Register Reference Guide"
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*/
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/*
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* Includes, defines, variables, module parameters, ...
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/types.h>
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/pci.h>
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#include <linux/ioport.h>
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#include <linux/platform_device.h>
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#include <linux/uaccess.h>
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#include <linux/io.h>
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#include "sp5100_tco.h"
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/* Module and version information */
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#define TCO_VERSION "0.01"
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#define TCO_MODULE_NAME "SP5100 TCO timer"
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#define TCO_DRIVER_NAME TCO_MODULE_NAME ", v" TCO_VERSION
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#define PFX TCO_MODULE_NAME ": "
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/* internal variables */
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static void __iomem *tcobase;
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static unsigned int pm_iobase;
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static DEFINE_SPINLOCK(tco_lock); /* Guards the hardware */
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static unsigned long timer_alive;
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static char tco_expect_close;
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static struct pci_dev *sp5100_tco_pci;
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/* the watchdog platform device */
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static struct platform_device *sp5100_tco_platform_device;
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/* module parameters */
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#define WATCHDOG_HEARTBEAT 60 /* 60 sec default heartbeat. */
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static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */
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module_param(heartbeat, int, 0);
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MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (default="
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__MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
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static int nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, int, 0);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started"
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" (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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/*
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* Some TCO specific functions
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*/
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static void tco_timer_start(void)
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{
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u32 val;
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unsigned long flags;
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spin_lock_irqsave(&tco_lock, flags);
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val = readl(SP5100_WDT_CONTROL(tcobase));
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val |= SP5100_WDT_START_STOP_BIT;
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writel(val, SP5100_WDT_CONTROL(tcobase));
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spin_unlock_irqrestore(&tco_lock, flags);
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}
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static void tco_timer_stop(void)
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{
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u32 val;
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unsigned long flags;
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spin_lock_irqsave(&tco_lock, flags);
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val = readl(SP5100_WDT_CONTROL(tcobase));
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val &= ~SP5100_WDT_START_STOP_BIT;
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writel(val, SP5100_WDT_CONTROL(tcobase));
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spin_unlock_irqrestore(&tco_lock, flags);
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}
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static void tco_timer_keepalive(void)
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{
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u32 val;
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unsigned long flags;
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spin_lock_irqsave(&tco_lock, flags);
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val = readl(SP5100_WDT_CONTROL(tcobase));
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val |= SP5100_WDT_TRIGGER_BIT;
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writel(val, SP5100_WDT_CONTROL(tcobase));
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spin_unlock_irqrestore(&tco_lock, flags);
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}
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static int tco_timer_set_heartbeat(int t)
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{
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unsigned long flags;
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if (t < 0 || t > 0xffff)
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return -EINVAL;
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/* Write new heartbeat to watchdog */
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spin_lock_irqsave(&tco_lock, flags);
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writel(t, SP5100_WDT_COUNT(tcobase));
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spin_unlock_irqrestore(&tco_lock, flags);
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heartbeat = t;
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return 0;
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}
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/*
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* /dev/watchdog handling
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*/
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static int sp5100_tco_open(struct inode *inode, struct file *file)
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{
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/* /dev/watchdog can only be opened once */
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if (test_and_set_bit(0, &timer_alive))
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return -EBUSY;
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/* Reload and activate timer */
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tco_timer_start();
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tco_timer_keepalive();
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return nonseekable_open(inode, file);
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}
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static int sp5100_tco_release(struct inode *inode, struct file *file)
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{
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/* Shut off the timer. */
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if (tco_expect_close == 42) {
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tco_timer_stop();
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} else {
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printk(KERN_CRIT PFX
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"Unexpected close, not stopping watchdog!\n");
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tco_timer_keepalive();
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}
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clear_bit(0, &timer_alive);
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tco_expect_close = 0;
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return 0;
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}
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static ssize_t sp5100_tco_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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/* See if we got the magic character 'V' and reload the timer */
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if (len) {
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if (!nowayout) {
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size_t i;
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/* note: just in case someone wrote the magic character
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* five months ago... */
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tco_expect_close = 0;
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/* scan to see whether or not we got the magic character
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*/
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for (i = 0; i != len; i++) {
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char c;
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if (get_user(c, data + i))
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return -EFAULT;
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if (c == 'V')
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tco_expect_close = 42;
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}
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}
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/* someone wrote to us, we should reload the timer */
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tco_timer_keepalive();
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}
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return len;
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}
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static long sp5100_tco_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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int new_options, retval = -EINVAL;
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int new_heartbeat;
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void __user *argp = (void __user *)arg;
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int __user *p = argp;
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static const struct watchdog_info ident = {
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.options = WDIOF_SETTIMEOUT |
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WDIOF_KEEPALIVEPING |
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WDIOF_MAGICCLOSE,
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.firmware_version = 0,
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.identity = TCO_MODULE_NAME,
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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(argp, &ident,
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sizeof(ident)) ? -EFAULT : 0;
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case WDIOC_GETSTATUS:
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case WDIOC_GETBOOTSTATUS:
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return put_user(0, p);
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case WDIOC_SETOPTIONS:
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if (get_user(new_options, p))
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return -EFAULT;
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if (new_options & WDIOS_DISABLECARD) {
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tco_timer_stop();
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retval = 0;
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}
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if (new_options & WDIOS_ENABLECARD) {
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tco_timer_start();
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tco_timer_keepalive();
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retval = 0;
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}
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return retval;
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case WDIOC_KEEPALIVE:
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tco_timer_keepalive();
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return 0;
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case WDIOC_SETTIMEOUT:
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if (get_user(new_heartbeat, p))
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return -EFAULT;
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if (tco_timer_set_heartbeat(new_heartbeat))
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return -EINVAL;
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tco_timer_keepalive();
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/* Fall through */
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case WDIOC_GETTIMEOUT:
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return put_user(heartbeat, p);
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default:
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return -ENOTTY;
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}
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}
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/*
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* Kernel Interfaces
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*/
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static const struct file_operations sp5100_tco_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = sp5100_tco_write,
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.unlocked_ioctl = sp5100_tco_ioctl,
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.open = sp5100_tco_open,
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.release = sp5100_tco_release,
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};
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static struct miscdevice sp5100_tco_miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &sp5100_tco_fops,
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};
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/*
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* Data for PCI driver interface
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*
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* This data only exists for exporting the supported
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* PCI ids via MODULE_DEVICE_TABLE. We do not actually
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* register a pci_driver, because someone else might
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* want to register another driver on the same PCI id.
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*/
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static struct pci_device_id sp5100_tco_pci_tbl[] = {
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{ PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS, PCI_ANY_ID,
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PCI_ANY_ID, },
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{ 0, }, /* End of list */
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};
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MODULE_DEVICE_TABLE(pci, sp5100_tco_pci_tbl);
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/*
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* Init & exit routines
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*/
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static unsigned char __devinit sp5100_tco_setupdevice(void)
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{
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struct pci_dev *dev = NULL;
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u32 val;
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/* Match the PCI device */
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for_each_pci_dev(dev) {
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if (pci_match_id(sp5100_tco_pci_tbl, dev) != NULL) {
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sp5100_tco_pci = dev;
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break;
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}
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}
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if (!sp5100_tco_pci)
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return 0;
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/* Request the IO ports used by this driver */
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pm_iobase = SP5100_IO_PM_INDEX_REG;
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if (!request_region(pm_iobase, SP5100_PM_IOPORTS_SIZE, "SP5100 TCO")) {
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printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
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pm_iobase);
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goto exit;
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}
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/* Find the watchdog base address. */
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outb(SP5100_PM_WATCHDOG_BASE3, SP5100_IO_PM_INDEX_REG);
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val = inb(SP5100_IO_PM_DATA_REG);
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outb(SP5100_PM_WATCHDOG_BASE2, SP5100_IO_PM_INDEX_REG);
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val = val << 8 | inb(SP5100_IO_PM_DATA_REG);
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outb(SP5100_PM_WATCHDOG_BASE1, SP5100_IO_PM_INDEX_REG);
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val = val << 8 | inb(SP5100_IO_PM_DATA_REG);
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outb(SP5100_PM_WATCHDOG_BASE0, SP5100_IO_PM_INDEX_REG);
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/* Low three bits of BASE0 are reserved. */
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val = val << 8 | (inb(SP5100_IO_PM_DATA_REG) & 0xf8);
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tcobase = ioremap(val, SP5100_WDT_MEM_MAP_SIZE);
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if (tcobase == 0) {
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printk(KERN_ERR PFX "failed to get tcobase address\n");
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goto unreg_region;
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}
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/* Enable watchdog decode bit */
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pci_read_config_dword(sp5100_tco_pci,
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SP5100_PCI_WATCHDOG_MISC_REG,
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&val);
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val |= SP5100_PCI_WATCHDOG_DECODE_EN;
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pci_write_config_dword(sp5100_tco_pci,
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SP5100_PCI_WATCHDOG_MISC_REG,
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val);
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/* Enable Watchdog timer and set the resolution to 1 sec. */
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outb(SP5100_PM_WATCHDOG_CONTROL, SP5100_IO_PM_INDEX_REG);
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val = inb(SP5100_IO_PM_DATA_REG);
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val |= SP5100_PM_WATCHDOG_SECOND_RES;
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val &= ~SP5100_PM_WATCHDOG_DISABLE;
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outb(val, SP5100_IO_PM_DATA_REG);
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/* Check that the watchdog action is set to reset the system. */
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val = readl(SP5100_WDT_CONTROL(tcobase));
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val &= ~SP5100_PM_WATCHDOG_ACTION_RESET;
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writel(val, SP5100_WDT_CONTROL(tcobase));
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/* Set a reasonable heartbeat before we stop the timer */
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tco_timer_set_heartbeat(heartbeat);
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/*
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* Stop the TCO before we change anything so we don't race with
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* a zeroed timer.
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*/
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tco_timer_stop();
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/* Done */
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return 1;
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iounmap(tcobase);
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unreg_region:
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release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
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exit:
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return 0;
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}
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static int __devinit sp5100_tco_init(struct platform_device *dev)
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{
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int ret;
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u32 val;
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/* Check whether or not the hardware watchdog is there. If found, then
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* set it up.
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*/
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if (!sp5100_tco_setupdevice())
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return -ENODEV;
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/* Check to see if last reboot was due to watchdog timeout */
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printk(KERN_INFO PFX "Watchdog reboot %sdetected.\n",
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readl(SP5100_WDT_CONTROL(tcobase)) & SP5100_PM_WATCHDOG_FIRED ?
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"" : "not ");
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/* Clear out the old status */
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val = readl(SP5100_WDT_CONTROL(tcobase));
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val &= ~SP5100_PM_WATCHDOG_FIRED;
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writel(val, SP5100_WDT_CONTROL(tcobase));
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/*
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* Check that the heartbeat value is within it's range.
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* If not, reset to the default.
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*/
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if (tco_timer_set_heartbeat(heartbeat)) {
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heartbeat = WATCHDOG_HEARTBEAT;
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tco_timer_set_heartbeat(heartbeat);
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}
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ret = misc_register(&sp5100_tco_miscdev);
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if (ret != 0) {
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printk(KERN_ERR PFX "cannot register miscdev on minor="
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"%d (err=%d)\n",
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WATCHDOG_MINOR, ret);
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goto exit;
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}
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clear_bit(0, &timer_alive);
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printk(KERN_INFO PFX "initialized (0x%p). heartbeat=%d sec"
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" (nowayout=%d)\n",
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tcobase, heartbeat, nowayout);
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return 0;
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exit:
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iounmap(tcobase);
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release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
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return ret;
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}
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static void __devexit sp5100_tco_cleanup(void)
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{
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/* Stop the timer before we leave */
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if (!nowayout)
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tco_timer_stop();
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/* Deregister */
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misc_deregister(&sp5100_tco_miscdev);
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iounmap(tcobase);
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release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
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}
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static int __devexit sp5100_tco_remove(struct platform_device *dev)
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{
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if (tcobase)
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sp5100_tco_cleanup();
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return 0;
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}
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static void sp5100_tco_shutdown(struct platform_device *dev)
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{
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tco_timer_stop();
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}
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|
||||
static struct platform_driver sp5100_tco_driver = {
|
||||
.probe = sp5100_tco_init,
|
||||
.remove = __devexit_p(sp5100_tco_remove),
|
||||
.shutdown = sp5100_tco_shutdown,
|
||||
.driver = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = TCO_MODULE_NAME,
|
||||
},
|
||||
};
|
||||
|
||||
static int __init sp5100_tco_init_module(void)
|
||||
{
|
||||
int err;
|
||||
|
||||
printk(KERN_INFO PFX "SP5100 TCO WatchDog Timer Driver v%s\n",
|
||||
TCO_VERSION);
|
||||
|
||||
err = platform_driver_register(&sp5100_tco_driver);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
sp5100_tco_platform_device = platform_device_register_simple(
|
||||
TCO_MODULE_NAME, -1, NULL, 0);
|
||||
if (IS_ERR(sp5100_tco_platform_device)) {
|
||||
err = PTR_ERR(sp5100_tco_platform_device);
|
||||
goto unreg_platform_driver;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
unreg_platform_driver:
|
||||
platform_driver_unregister(&sp5100_tco_driver);
|
||||
return err;
|
||||
}
|
||||
|
||||
static void __exit sp5100_tco_cleanup_module(void)
|
||||
{
|
||||
platform_device_unregister(sp5100_tco_platform_device);
|
||||
platform_driver_unregister(&sp5100_tco_driver);
|
||||
printk(KERN_INFO PFX "SP5100 TCO Watchdog Module Unloaded.\n");
|
||||
}
|
||||
|
||||
module_init(sp5100_tco_init_module);
|
||||
module_exit(sp5100_tco_cleanup_module);
|
||||
|
||||
MODULE_AUTHOR("Priyanka Gupta");
|
||||
MODULE_DESCRIPTION("TCO timer driver for SP5100 chipset");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|
||||
41
drivers/watchdog/sp5100_tco.h
Normal file
41
drivers/watchdog/sp5100_tco.h
Normal file
|
|
@ -0,0 +1,41 @@
|
|||
/*
|
||||
* sp5100_tco: TCO timer driver for sp5100 chipsets.
|
||||
*
|
||||
* (c) Copyright 2009 Google Inc., All Rights Reserved.
|
||||
*
|
||||
* TCO timer driver for sp5100 chipsets
|
||||
*/
|
||||
|
||||
/*
|
||||
* Some address definitions for the Watchdog
|
||||
*/
|
||||
|
||||
#define SP5100_WDT_MEM_MAP_SIZE 0x08
|
||||
#define SP5100_WDT_CONTROL(base) ((base) + 0x00) /* Watchdog Control */
|
||||
#define SP5100_WDT_COUNT(base) ((base) + 0x04) /* Watchdog Count */
|
||||
|
||||
#define SP5100_WDT_START_STOP_BIT 1
|
||||
#define SP5100_WDT_TRIGGER_BIT (1 << 7)
|
||||
|
||||
#define SP5100_PCI_WATCHDOG_MISC_REG 0x41
|
||||
#define SP5100_PCI_WATCHDOG_DECODE_EN (1 << 3)
|
||||
|
||||
#define SP5100_PM_IOPORTS_SIZE 0x02
|
||||
|
||||
/* These two IO registers are hardcoded and there doesn't seem to be a way to
|
||||
* read them from a register.
|
||||
*/
|
||||
#define SP5100_IO_PM_INDEX_REG 0xCD6
|
||||
#define SP5100_IO_PM_DATA_REG 0xCD7
|
||||
|
||||
#define SP5100_PM_WATCHDOG_CONTROL 0x69
|
||||
#define SP5100_PM_WATCHDOG_BASE0 0x6C
|
||||
#define SP5100_PM_WATCHDOG_BASE1 0x6D
|
||||
#define SP5100_PM_WATCHDOG_BASE2 0x6E
|
||||
#define SP5100_PM_WATCHDOG_BASE3 0x6F
|
||||
|
||||
#define SP5100_PM_WATCHDOG_FIRED (1 << 1)
|
||||
#define SP5100_PM_WATCHDOG_ACTION_RESET (1 << 2)
|
||||
|
||||
#define SP5100_PM_WATCHDOG_DISABLE 1
|
||||
#define SP5100_PM_WATCHDOG_SECOND_RES (3 << 1)
|
||||
Loading…
Reference in a new issue