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;
}
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);
}
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;
}
static int nv_tco_release(struct inode *inode, struct file *file)
{
/* Shut off the timer */
if (tco_expect_close == 42) {
tco_timer_stop();
} else {
printk(KERN_CRIT PFX "Unexpected close, not stopping "
"watchdog!\n");
tco_timer_keepalive();
}
clear_bit(0, &timer_alive);
tco_expect_close = 0;
return 0;
}
static int sp5100_tco_release(struct inode *inode, struct file *file)
{
/* Shut off the timer. */
if (tco_expect_close == 42) {
tco_timer_stop();
} else {
// printk(KERN_CRIT PFX
;
tco_timer_keepalive();
}
clear_bit(0, &timer_alive);
tco_expect_close = 0;
return 0;
}
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;
}
}
/*
* 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 DEFINE_PCI_DEVICE_TABLE(sp5100_tco_pci_tbl) = {
{ PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_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 __devinit sp5100_tco_setupdevice(void)
{
struct pci_dev *dev = NULL;
u32 val;
/* 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;
/* Request the IO ports used by this driver */
pm_iobase = SP5100_IO_PM_INDEX_REG;
if (!request_region(pm_iobase, SP5100_PM_IOPORTS_SIZE, "SP5100 TCO")) {
pr_err("I/O address 0x%04x already in use\n", pm_iobase);
goto exit;
}
/* Find the watchdog base address. */
outb(SP5100_PM_WATCHDOG_BASE3, SP5100_IO_PM_INDEX_REG);
val = inb(SP5100_IO_PM_DATA_REG);
outb(SP5100_PM_WATCHDOG_BASE2, SP5100_IO_PM_INDEX_REG);
val = val << 8 | inb(SP5100_IO_PM_DATA_REG);
outb(SP5100_PM_WATCHDOG_BASE1, SP5100_IO_PM_INDEX_REG);
val = val << 8 | inb(SP5100_IO_PM_DATA_REG);
outb(SP5100_PM_WATCHDOG_BASE0, SP5100_IO_PM_INDEX_REG);
/* Low three bits of BASE0 are reserved. */
val = val << 8 | (inb(SP5100_IO_PM_DATA_REG) & 0xf8);
if (!request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE,
"SP5100 TCO")) {
pr_err("mmio address 0x%04x already in use\n", val);
goto unreg_region;
}
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;
}
/* 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);
/* Check that the watchdog action is set to reset the system. */
val = readl(SP5100_WDT_CONTROL(tcobase));
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;
}
static int __devinit sp5100_tco_init(struct platform_device *dev)
{
int ret;
u32 val;
/* 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("Watchdog reboot %sdetected\n",
readl(SP5100_WDT_CONTROL(tcobase)) & SP5100_PM_WATCHDOG_FIRED ?
"" : "not ");
/* Clear out the old status */
val = readl(SP5100_WDT_CONTROL(tcobase));
val &= ~SP5100_PM_WATCHDOG_FIRED;
writel(val, SP5100_WDT_CONTROL(tcobase));
/*
* 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);
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;
}
static void __devexit 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);
}
static int __devexit sp5100_tco_remove(struct platform_device *dev)
{
if (tcobase)
sp5100_tco_cleanup();
return 0;
}
static void sp5100_tco_shutdown(struct platform_device *dev)
{
tco_timer_stop();
}
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;
pr_info("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 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;
}
}
/*
* 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 DEFINE_PCI_DEVICE_TABLE(sp5100_tco_pci_tbl) = {
{ PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_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 Revision ID: 0x%x\n", sp5100_tco_pci->revision);
/*
* Determine type of southbridge chipset.
*/
if (sp5100_tco_pci->revision >= 0x40) {
dev_name = SB800_DEVNAME;
index_reg = SB800_IO_PM_INDEX_REG;
data_reg = SB800_IO_PM_DATA_REG;
base_addr = SB800_PM_WATCHDOG_BASE;
} else {
dev_name = SP5100_DEVNAME;
index_reg = SP5100_IO_PM_INDEX_REG;
data_reg = SP5100_IO_PM_DATA_REG;
base_addr = SP5100_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 (sp5100_tco_pci->revision >= 0x40) {
/* 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);
} else {
/* Read SBResource_MMIO from PCI config(PCI_Reg: 9Ch) */
pci_read_config_dword(sp5100_tco_pci,
SP5100_SB_RESOURCE_MMIO_BASE, &val);
}
/* 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;
}
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;
}
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);
}
static int sp5100_tco_remove(struct platform_device *dev)
{
if (tcobase)
sp5100_tco_cleanup();
return 0;
}
static void sp5100_tco_shutdown(struct platform_device *dev)
{
tco_timer_stop();
}
static struct platform_driver sp5100_tco_driver = {
.probe = sp5100_tco_init,
.remove = 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;
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;
}
static long nv_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_keepalive();
tco_timer_start();
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;
}
}
/*
* Kernel Interfaces
*/
static const struct file_operations nv_tco_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = nv_tco_write,
.unlocked_ioctl = nv_tco_ioctl,
.open = nv_tco_open,
.release = nv_tco_release,
};
static struct miscdevice nv_tco_miscdev = {
.minor = WATCHDOG_MINOR,
.name = "watchdog",
.fops = &nv_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 one day
* want to register another driver on the same PCI id.
*/
static struct pci_device_id tco_pci_tbl[] = {
{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS,
PCI_ANY_ID, PCI_ANY_ID,
},
{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS,
PCI_ANY_ID, PCI_ANY_ID,
},
{ 0, }, /* End of list */
};
MODULE_DEVICE_TABLE(pci, tco_pci_tbl);
/*
* Init & exit routines
*/
static unsigned char __init nv_tco_getdevice(void)
{
struct pci_dev *dev = NULL;
u32 val;
/* Find the PCI device */
for_each_pci_dev(dev) {
if (pci_match_id(tco_pci_tbl, dev) != NULL) {
tco_pci = dev;
break;
}
}
if (!tco_pci)
return 0;
/* Find the base io port */
pci_read_config_dword(tco_pci, 0x64, &val);
val &= 0xffff;
if (val == 0x0001 || val == 0x0000) {
/* Something is wrong here, bar isn't setup */
printk(KERN_ERR PFX "failed to get tcobase address\n");
return 0;
}
val &= 0xff00;
tcobase = val + 0x40;
if (!request_region(tcobase, 0x10, "NV TCO")) {
printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
tcobase);
return 0;
}
/* Set a reasonable heartbeat before we stop the timer */
tco_timer_set_heartbeat(30);
/*
* Stop the TCO before we change anything so we don't race with
* a zeroed timer.
*/
tco_timer_keepalive();
tco_timer_stop();
/* Disable SMI caused by TCO */
if (!request_region(MCP51_SMI_EN(tcobase), 4, "NV TCO")) {
printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
MCP51_SMI_EN(tcobase));
goto out;
}
val = inl(MCP51_SMI_EN(tcobase));
val &= ~MCP51_SMI_EN_TCO;
outl(val, MCP51_SMI_EN(tcobase));
val = inl(MCP51_SMI_EN(tcobase));
release_region(MCP51_SMI_EN(tcobase), 4);
if (val & MCP51_SMI_EN_TCO) {
printk(KERN_ERR PFX "Could not disable SMI caused by TCO\n");
goto out;
}
/* Check chipset's NO_REBOOT bit */
pci_read_config_dword(tco_pci, MCP51_SMBUS_SETUP_B, &val);
val |= MCP51_SMBUS_SETUP_B_TCO_REBOOT;
pci_write_config_dword(tco_pci, MCP51_SMBUS_SETUP_B, val);
pci_read_config_dword(tco_pci, MCP51_SMBUS_SETUP_B, &val);
if (!(val & MCP51_SMBUS_SETUP_B_TCO_REBOOT)) {
printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, reboot "
"disabled by hardware\n");
goto out;
}
return 1;
out:
release_region(tcobase, 0x10);
return 0;
}
static int __devinit nv_tco_init(struct platform_device *dev)
{
int ret;
/* Check whether or not the hardware watchdog is there */
if (!nv_tco_getdevice())
return -ENODEV;
/* Check to see if last reboot was due to watchdog timeout */
printk(KERN_INFO PFX "Watchdog reboot %sdetected.\n",
inl(TCO_STS(tcobase)) & TCO_STS_TCO2TO_STS ? "" : "not ");
/* Clear out the old status */
outl(TCO_STS_RESET, TCO_STS(tcobase));
/*
* 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);
printk(KERN_INFO PFX "heartbeat value must be 2<heartbeat<39, "
"using %d\n", heartbeat);
}
ret = misc_register(&nv_tco_miscdev);
if (ret != 0) {
printk(KERN_ERR PFX "cannot register miscdev on minor=%d "
"(err=%d)\n", WATCHDOG_MINOR, ret);
goto unreg_region;
}
clear_bit(0, &timer_alive);
tco_timer_stop();
printk(KERN_INFO PFX "initialized (0x%04x). heartbeat=%d sec "
"(nowayout=%d)\n", tcobase, heartbeat, nowayout);
return 0;
unreg_region:
release_region(tcobase, 0x10);
return ret;
}
static void __devexit nv_tco_cleanup(void)
{
u32 val;
/* Stop the timer before we leave */
if (!nowayout)
tco_timer_stop();
/* Set the NO_REBOOT bit to prevent later reboots, just for sure */
pci_read_config_dword(tco_pci, MCP51_SMBUS_SETUP_B, &val);
val &= ~MCP51_SMBUS_SETUP_B_TCO_REBOOT;
pci_write_config_dword(tco_pci, MCP51_SMBUS_SETUP_B, val);
pci_read_config_dword(tco_pci, MCP51_SMBUS_SETUP_B, &val);
if (val & MCP51_SMBUS_SETUP_B_TCO_REBOOT) {
printk(KERN_CRIT PFX "Couldn't unset REBOOT bit. Machine may "
"soon reset\n");
}
/* Deregister */
misc_deregister(&nv_tco_miscdev);
release_region(tcobase, 0x10);
}
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;
}
}
/*
* 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, },
{ 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 *