Release 4.7 drivers/watchdog/sp5100_tco.c

/*
 *      sp5100_tco :    TCO timer driver for sp5100 chipsets
 *
 *      (c) Copyright 2009 Google Inc., All Rights Reserved.
 *
 *      Based on i8xx_tco.c:
 *      (c) Copyright 2000 kernel concepts <nils@kernelconcepts.de>, All Rights
 *      Reserved.
 *                              http://www.kernelconcepts.de
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 *
 *      See AMD Publication 43009 "AMD SB700/710/750 Register Reference Guide",
 *          AMD Publication 45482 "AMD SB800-Series Southbridges Register
 *                                                            Reference Guide"
 */

/*
 *      Includes, defines, variables, module parameters, ...
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/uaccess.h>
#include <linux/io.h>

#include "sp5100_tco.h"

/* Module and version information */

#define TCO_VERSION "0.05"

#define TCO_MODULE_NAME "SP5100 TCO timer"

#define TCO_DRIVER_NAME   TCO_MODULE_NAME ", v" TCO_VERSION

/* internal variables */

static u32 tcobase_phys;

static u32 tco_wdt_fired;

static void __iomem *tcobase;

static unsigned int pm_iobase;
static DEFINE_SPINLOCK(tco_lock);	/* Guards the hardware */

static unsigned long timer_alive;

static char tco_expect_close;

static struct pci_dev *sp5100_tco_pci;

/* the watchdog platform device */

static struct platform_device *sp5100_tco_platform_device;

/* module parameters */


#define WATCHDOG_HEARTBEAT 60	
/* 60 sec default heartbeat. */

static int heartbeat = WATCHDOG_HEARTBEAT;  
/* in seconds */
module_param(heartbeat, int, 0);
MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (default="
		 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");


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) ")");

/*
 * Some TCO specific functions
 */



static bool tco_has_sp5100_reg_layout(struct pci_dev *dev)
{
	return dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS &&
	       dev->revision < 0x40;
}

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static void tco_timer_start(void)
{
	u32 val;
	unsigned long flags;

	spin_lock_irqsave(&tco_lock, flags);
	val = readl(SP5100_WDT_CONTROL(tcobase));
	val |= SP5100_WDT_START_STOP_BIT;
	writel(val, SP5100_WDT_CONTROL(tcobase));
	spin_unlock_irqrestore(&tco_lock, flags);
}

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static void tco_timer_stop(void)
{
	u32 val;
	unsigned long flags;

	spin_lock_irqsave(&tco_lock, flags);
	val = readl(SP5100_WDT_CONTROL(tcobase));
	val &= ~SP5100_WDT_START_STOP_BIT;
	writel(val, SP5100_WDT_CONTROL(tcobase));
	spin_unlock_irqrestore(&tco_lock, flags);
}

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static void tco_timer_keepalive(void)
{
	u32 val;
	unsigned long flags;

	spin_lock_irqsave(&tco_lock, flags);
	val = readl(SP5100_WDT_CONTROL(tcobase));
	val |= SP5100_WDT_TRIGGER_BIT;
	writel(val, SP5100_WDT_CONTROL(tcobase));
	spin_unlock_irqrestore(&tco_lock, flags);
}

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static int tco_timer_set_heartbeat(int t)
{
	unsigned long flags;

	if (t < 0 || t > 0xffff)
		return -EINVAL;

	/* Write new heartbeat to watchdog */
	spin_lock_irqsave(&tco_lock, flags);
	writel(t, SP5100_WDT_COUNT(tcobase));
	spin_unlock_irqrestore(&tco_lock, flags);

	heartbeat = t;
	return 0;
}

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static void tco_timer_enable(void)
{
	int val;

	if (!tco_has_sp5100_reg_layout(sp5100_tco_pci)) {
		/* For SB800 or later */
		/* Set the Watchdog timer resolution to 1 sec */
		outb(SB800_PM_WATCHDOG_CONFIG, SB800_IO_PM_INDEX_REG);
		val = inb(SB800_IO_PM_DATA_REG);
		val |= SB800_PM_WATCHDOG_SECOND_RES;
		outb(val, SB800_IO_PM_DATA_REG);

		/* Enable watchdog decode bit and watchdog timer */
		outb(SB800_PM_WATCHDOG_CONTROL, SB800_IO_PM_INDEX_REG);
		val = inb(SB800_IO_PM_DATA_REG);
		val |= SB800_PCI_WATCHDOG_DECODE_EN;
		val &= ~SB800_PM_WATCHDOG_DISABLE;
		outb(val, SB800_IO_PM_DATA_REG);
	} else {
		/* For SP5100 or SB7x0 */
		/* Enable watchdog decode bit */
		pci_read_config_dword(sp5100_tco_pci,
				      SP5100_PCI_WATCHDOG_MISC_REG,
				      &val);

		val |= SP5100_PCI_WATCHDOG_DECODE_EN;

		pci_write_config_dword(sp5100_tco_pci,
				       SP5100_PCI_WATCHDOG_MISC_REG,
				       val);

		/* Enable Watchdog timer and set the resolution to 1 sec */
		outb(SP5100_PM_WATCHDOG_CONTROL, SP5100_IO_PM_INDEX_REG);
		val = inb(SP5100_IO_PM_DATA_REG);
		val |= SP5100_PM_WATCHDOG_SECOND_RES;
		val &= ~SP5100_PM_WATCHDOG_DISABLE;
		outb(val, SP5100_IO_PM_DATA_REG);
	}
}

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/*
 *      /dev/watchdog handling
 */



static int sp5100_tco_open(struct inode *inode, struct file *file)
{
	/* /dev/watchdog can only be opened once */
	if (test_and_set_bit(0, &timer_alive))
		return -EBUSY;

	/* Reload and activate timer */
	tco_timer_start();
	tco_timer_keepalive();
	return nonseekable_open(inode, file);
}

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static int sp5100_tco_release(struct inode *inode, struct file *file)
{
	/* Shut off the timer. */
	if (tco_expect_close == 42) {
		tco_timer_stop();
	} else {
		pr_crit("Unexpected close, not stopping watchdog!\n");
		tco_timer_keepalive();
	}
	clear_bit(0, &timer_alive);
	tco_expect_close = 0;
	return 0;
}

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static ssize_t sp5100_tco_write(struct file *file, const char __user *data,
				size_t len, loff_t *ppos)
{
	/* See if we got the magic character 'V' and reload the timer */
	if (len) {
		if (!nowayout) {
			size_t i;

			/* note: just in case someone wrote the magic character
                         * five months ago... */
			tco_expect_close = 0;

			/* scan to see whether or not we got the magic character
                         */
			for (i = 0; i != len; i++) {
				char c;
				if (get_user(c, data + i))
					return -EFAULT;
				if (c == 'V')
					tco_expect_close = 42;
			}
		}

		/* someone wrote to us, we should reload the timer */
		tco_timer_keepalive();
	}
	return len;
}

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static long sp5100_tco_ioctl(struct file *file, unsigned int cmd,
			     unsigned long arg)
{
	int new_options, retval = -EINVAL;
	int new_heartbeat;
	void __user *argp = (void __user *)arg;
	int __user *p = argp;
	static const struct watchdog_info ident = {
		.options =		WDIOF_SETTIMEOUT |
					WDIOF_KEEPALIVEPING |
					WDIOF_MAGICCLOSE,
		.firmware_version =	0,
		.identity =		TCO_MODULE_NAME,
        };

	switch (cmd) {
	case WDIOC_GETSUPPORT:
		return copy_to_user(argp, &ident,
			sizeof(ident)) ? -EFAULT : 0;
	case WDIOC_GETSTATUS:
	case WDIOC_GETBOOTSTATUS:
		return put_user(0, p);
	case WDIOC_SETOPTIONS:
		if (get_user(new_options, p))
			return -EFAULT;
		if (new_options & WDIOS_DISABLECARD) {
			tco_timer_stop();
			retval = 0;
		}
		if (new_options & WDIOS_ENABLECARD) {
			tco_timer_start();
			tco_timer_keepalive();
			retval = 0;
		}
		return retval;
	case WDIOC_KEEPALIVE:
		tco_timer_keepalive();
		return 0;
	case WDIOC_SETTIMEOUT:
		if (get_user(new_heartbeat, p))
			return -EFAULT;
		if (tco_timer_set_heartbeat(new_heartbeat))
			return -EINVAL;
		tco_timer_keepalive();
		/* Fall through */
	case WDIOC_GETTIMEOUT:
		return put_user(heartbeat, p);
	default:
		return -ENOTTY;
	}
}

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/*
 * Kernel Interfaces
 */


static const struct file_operations sp5100_tco_fops = {
	.owner =		THIS_MODULE,
	.llseek =		no_llseek,
	.write =		sp5100_tco_write,
	.unlocked_ioctl =	sp5100_tco_ioctl,
	.open =			sp5100_tco_open,
	.release =		sp5100_tco_release,
};


static struct miscdevice sp5100_tco_miscdev = {
	.minor =	WATCHDOG_MINOR,
	.name =		"watchdog",
	.fops =		&sp5100_tco_fops,
};

/*
 * Data for PCI driver interface
 *
 * This data only exists for exporting the supported
 * PCI ids via MODULE_DEVICE_TABLE.  We do not actually
 * register a pci_driver, because someone else might
 * want to register another driver on the same PCI id.
 */

static const struct pci_device_id sp5100_tco_pci_tbl[] = {
	{ PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS, PCI_ANY_ID,
	  PCI_ANY_ID, },
	{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_HUDSON2_SMBUS, PCI_ANY_ID,
	  PCI_ANY_ID, },
	{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_KERNCZ_SMBUS, PCI_ANY_ID,
	  PCI_ANY_ID, },
	{ 0, },			/* End of list */
};
MODULE_DEVICE_TABLE(pci, sp5100_tco_pci_tbl);

/*
 * Init & exit routines
 */


static unsigned char sp5100_tco_setupdevice(void)
{
	struct pci_dev *dev = NULL;
	const char *dev_name = NULL;
	u32 val;
	u32 index_reg, data_reg, base_addr;

	/* Match the PCI device */
	for_each_pci_dev(dev) {
		if (pci_match_id(sp5100_tco_pci_tbl, dev) != NULL) {
			sp5100_tco_pci = dev;
			break;
		}
	}

	if (!sp5100_tco_pci)
		return 0;

	pr_info("PCI Vendor ID: 0x%x, Device ID: 0x%x, Revision ID: 0x%x\n",
		sp5100_tco_pci->vendor, sp5100_tco_pci->device,
		sp5100_tco_pci->revision);

	/*
         * Determine type of southbridge chipset.
         */
	if (tco_has_sp5100_reg_layout(sp5100_tco_pci)) {
		dev_name = SP5100_DEVNAME;
		index_reg = SP5100_IO_PM_INDEX_REG;
		data_reg = SP5100_IO_PM_DATA_REG;
		base_addr = SP5100_PM_WATCHDOG_BASE;
	} else {
		dev_name = SB800_DEVNAME;
		index_reg = SB800_IO_PM_INDEX_REG;
		data_reg = SB800_IO_PM_DATA_REG;
		base_addr = SB800_PM_WATCHDOG_BASE;
	}

	/* Request the IO ports used by this driver */
	pm_iobase = SP5100_IO_PM_INDEX_REG;
	if (!request_region(pm_iobase, SP5100_PM_IOPORTS_SIZE, dev_name)) {
		pr_err("I/O address 0x%04x already in use\n", pm_iobase);
		goto exit;
	}

	/*
         * First, Find the watchdog timer MMIO address from indirect I/O.
         */
	outb(base_addr+3, index_reg);
	val = inb(data_reg);
	outb(base_addr+2, index_reg);
	val = val << 8 | inb(data_reg);
	outb(base_addr+1, index_reg);
	val = val << 8 | inb(data_reg);
	outb(base_addr+0, index_reg);
	/* Low three bits of BASE are reserved */
	val = val << 8 | (inb(data_reg) & 0xf8);

	pr_debug("Got 0x%04x from indirect I/O\n", val);

	/* Check MMIO address conflict */
	if (request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE,
								dev_name))
		goto setup_wdt;
	else
		pr_debug("MMIO address 0x%04x already in use\n", val);

	/*
         * Secondly, Find the watchdog timer MMIO address
         * from SBResource_MMIO register.
         */
	if (tco_has_sp5100_reg_layout(sp5100_tco_pci)) {
		/* Read SBResource_MMIO from PCI config(PCI_Reg: 9Ch) */
		pci_read_config_dword(sp5100_tco_pci,
				      SP5100_SB_RESOURCE_MMIO_BASE, &val);
	} else {
		/* Read SBResource_MMIO from AcpiMmioEn(PM_Reg: 24h) */
		outb(SB800_PM_ACPI_MMIO_EN+3, SB800_IO_PM_INDEX_REG);
		val = inb(SB800_IO_PM_DATA_REG);
		outb(SB800_PM_ACPI_MMIO_EN+2, SB800_IO_PM_INDEX_REG);
		val = val << 8 | inb(SB800_IO_PM_DATA_REG);
		outb(SB800_PM_ACPI_MMIO_EN+1, SB800_IO_PM_INDEX_REG);
		val = val << 8 | inb(SB800_IO_PM_DATA_REG);
		outb(SB800_PM_ACPI_MMIO_EN+0, SB800_IO_PM_INDEX_REG);
		val = val << 8 | inb(SB800_IO_PM_DATA_REG);
	}

	/* The SBResource_MMIO is enabled and mapped memory space? */
	if ((val & (SB800_ACPI_MMIO_DECODE_EN | SB800_ACPI_MMIO_SEL)) ==
						  SB800_ACPI_MMIO_DECODE_EN) {
		/* Clear unnecessary the low twelve bits */
		val &= ~0xFFF;
		/* Add the Watchdog Timer offset to base address. */
		val += SB800_PM_WDT_MMIO_OFFSET;
		/* Check MMIO address conflict */
		if (request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE,
								   dev_name)) {
			pr_debug("Got 0x%04x from SBResource_MMIO register\n",
				val);
			goto setup_wdt;
		} else
			pr_debug("MMIO address 0x%04x already in use\n", val);
	} else
		pr_debug("SBResource_MMIO is disabled(0x%04x)\n", val);

	pr_notice("failed to find MMIO address, giving up.\n");
	goto  unreg_region;

setup_wdt:
	tcobase_phys = val;

	tcobase = ioremap(val, SP5100_WDT_MEM_MAP_SIZE);
	if (!tcobase) {
		pr_err("failed to get tcobase address\n");
		goto unreg_mem_region;
	}

	pr_info("Using 0x%04x for watchdog MMIO address\n", val);

	/* Setup the watchdog timer */
	tco_timer_enable();

	/* Check that the watchdog action is set to reset the system */
	val = readl(SP5100_WDT_CONTROL(tcobase));
	/*
         * Save WatchDogFired status, because WatchDogFired flag is
         * cleared here.
         */
	tco_wdt_fired = val & SP5100_PM_WATCHDOG_FIRED;
	val &= ~SP5100_PM_WATCHDOG_ACTION_RESET;
	writel(val, SP5100_WDT_CONTROL(tcobase));

	/* Set a reasonable heartbeat before we stop the timer */
	tco_timer_set_heartbeat(heartbeat);

	/*
         * Stop the TCO before we change anything so we don't race with
         * a zeroed timer.
         */
	tco_timer_stop();

	/* Done */
	return 1;

unreg_mem_region:
	release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
unreg_region:
	release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
exit:
	return 0;
}

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static int sp5100_tco_init(struct platform_device *dev)
{
	int ret;

	/*
         * Check whether or not the hardware watchdog is there. If found, then
         * set it up.
         */
	if (!sp5100_tco_setupdevice())
		return -ENODEV;

	/* Check to see if last reboot was due to watchdog timeout */
	pr_info("Last reboot was %striggered by watchdog.\n",
		tco_wdt_fired ? "" : "not ");

	/*
         * Check that the heartbeat value is within it's range.
         * If not, reset to the default.
         */
	if (tco_timer_set_heartbeat(heartbeat)) {
		heartbeat = WATCHDOG_HEARTBEAT;
		tco_timer_set_heartbeat(heartbeat);
	}

	ret = misc_register(&sp5100_tco_miscdev);
	if (ret != 0) {
		pr_err("cannot register miscdev on minor=%d (err=%d)\n",
		       WATCHDOG_MINOR, ret);
		goto exit;
	}

	clear_bit(0, &timer_alive);

	/* Show module parameters */
	pr_info("initialized (0x%p). heartbeat=%d sec (nowayout=%d)\n",
		tcobase, heartbeat, nowayout);

	return 0;

exit:
	iounmap(tcobase);
	release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
	release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
	return ret;
}

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static void sp5100_tco_cleanup(void)
{
	/* Stop the timer before we leave */
	if (!nowayout)
		tco_timer_stop();

	/* Deregister */
	misc_deregister(&sp5100_tco_miscdev);
	iounmap(tcobase);
	release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
	release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
}

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static int sp5100_tco_remove(struct platform_device *dev)
{
	if (tcobase)
		sp5100_tco_cleanup();
	return 0;
}

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static void sp5100_tco_shutdown(struct platform_device *dev)
{
	tco_timer_stop();
}

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static struct platform_driver sp5100_tco_driver = {
	.probe		= sp5100_tco_init,
	.remove		= sp5100_tco_remove,
	.shutdown	= sp5100_tco_shutdown,
	.driver		= {
		.name	= TCO_MODULE_NAME,
        },
};



static int __init sp5100_tco_init_module(void)
{
	int err;

	pr_info("SP5100/SB800 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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
priyanka gupta
priyanka gupta
77
95.06%
1
33.33%
joe perches
joe perches
3
3.70%
1
33.33%
takahisa tanaka
takahisa tanaka
1
1.23%
1
33.33%
Total
81
100.00%
3
100.00%



static void __exit sp5100_tco_cleanup_module(void)
{
	platform_device_unregister(sp5100_tco_platform_device);
	platform_driver_unregister(&sp5100_tco_driver);
	pr_info("SP5100/SB800 TCO Watchdog Module Unloaded\n");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
priyanka gupta
priyanka gupta
22
88.00%
1
33.33%
joe perches
joe perches
2
8.00%
1
33.33%
takahisa tanaka
takahisa tanaka
1
4.00%
1
33.33%
Total
25
100.00%
3
100.00%


module_init(sp5100_tco_init_module);

module_exit(sp5100_tco_cleanup_module);

MODULE_AUTHOR("Priyanka Gupta");
MODULE_DESCRIPTION("TCO timer driver for SP5100/SB800 chipset");
MODULE_LICENSE("GPL");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
priyanka gupta
priyanka gupta
1309
64.45%
1
9.09%
takahisa tanaka
takahisa tanaka
555
27.33%
2
18.18%
yinghai lu
yinghai lu
41
2.02%
1
9.09%
huang rui
huang rui
41
2.02%
2
18.18%
lucas stach
lucas stach
34
1.67%
1
9.09%
joe perches
joe perches
33
1.62%
1
9.09%
denis turischev
denis turischev
10
0.49%
1
9.09%
jingoo han
jingoo han
6
0.30%
1
9.09%
wim van sebroeck
wim van sebroeck
2
0.10%
1
9.09%
Total
2031
100.00%
11
100.00%
  
Directory: drivers/watchdog

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