Commit 00b1533f authored by Dave Jones's avatar Dave Jones

[WATCHDOG] amd7xx_tco updates from Zwane, and nuke EXPORT_NO_SYMBOLS

parent c7650146
/*
* AMD 766/768 TCO Timer Driver
* (c) Copyright 2002 Zwane Mwaikambo <zwane@commfireservices.com>
* (c) Copyright 2002 Zwane Mwaikambo <zwane@holomorphy.com>
* All Rights Reserved.
*
* Parts from;
......@@ -34,35 +34,48 @@
#include <linux/init.h>
#include <linux/pci.h>
#define AMDTCO_MODULE_VER "build 20020601"
#define AMDTCO_MODULE_VER "build 20021116"
#define AMDTCO_MODULE_NAME "amd7xx_tco"
#define PFX AMDTCO_MODULE_NAME ": "
#define MAX_TIMEOUT 38 /* max of 38 seconds */
#define MAX_TIMEOUT 38 /* max of 38 seconds, although the system will only
* reset itself after the second timeout */
/* pmbase registers */
#define GLOBAL_SMI_REG 0x2a
#define TCO_EN (1 << 1) /* bit 1 in global SMI register */
#define TCO_RELOAD_REG 0x40 /* bits 0-5 are current count, 6-7 are reserved */
#define TCO_INITVAL_REG 0x41 /* bits 0-5 are value to load, 6-7 are reserved */
#define TCO_TIMEOUT_MASK 0x3f
#define TCO_STATUS1_REG 0x44
#define TCO_STATUS2_REG 0x46
#define NDTO_STS2 (1 << 1) /* we're interested in the second timeout */
#define BOOT_STS (1 << 2) /* will be set if NDTO_STS2 was set before reboot */
#define TCO_CTRL1_REG 0x48
#define TCO_HALT (1 << 11)
#define NO_REBOOT (1 << 10) /* in DevB:3x48 */
static char banner[] __initdata = KERN_INFO PFX AMDTCO_MODULE_VER;
static int timeout = 38;
static char banner[] __initdata = KERN_INFO PFX AMDTCO_MODULE_VER "\n";
static int timeout = MAX_TIMEOUT;
static u32 pmbase; /* PMxx I/O base */
static struct pci_dev *dev;
static struct semaphore open_sem;
spinlock_t amdtco_lock; /* only for device access */
static spinlock_t amdtco_lock; /* only for device access */
static int expect_close = 0;
MODULE_PARM(timeout, "i");
MODULE_PARM_DESC(timeout, "range is 0-38 seconds, default is 38");
static inline u8 seconds_to_ticks(int seconds)
{
/* the internal timer is stored as ticks which decrement
* every 0.6 seconds */
return (seconds * 10) / 6;
}
static inline int ticks_to_seconds(u8 ticks)
{
return (ticks * 6) / 10;
}
static inline int amdtco_status(void)
{
u16 reg;
......@@ -81,28 +94,19 @@ static inline int amdtco_status(void)
static inline void amdtco_ping(void)
{
u8 reg;
spin_lock(&amdtco_lock);
reg = inb(pmbase+TCO_RELOAD_REG);
outb(1 | reg, pmbase+TCO_RELOAD_REG);
spin_unlock(&amdtco_lock);
outb(1, pmbase+TCO_RELOAD_REG);
}
static inline int amdtco_gettimeout(void)
{
return inb(TCO_RELOAD_REG) & TCO_TIMEOUT_MASK;
u8 reg = inb(pmbase+TCO_RELOAD_REG) & TCO_TIMEOUT_MASK;
return ticks_to_seconds(reg);
}
static inline void amdtco_settimeout(unsigned int timeout)
{
u8 reg;
spin_lock(&amdtco_lock);
reg = inb(pmbase+TCO_INITVAL_REG);
reg |= timeout & TCO_TIMEOUT_MASK;
u8 reg = seconds_to_ticks(timeout) & TCO_TIMEOUT_MASK;
outb(reg, pmbase+TCO_INITVAL_REG);
spin_unlock(&amdtco_lock);
}
static inline void amdtco_global_enable(void)
......@@ -110,9 +114,12 @@ static inline void amdtco_global_enable(void)
u16 reg;
spin_lock(&amdtco_lock);
reg = inw(pmbase+GLOBAL_SMI_REG);
reg |= TCO_EN;
outw(reg, pmbase+GLOBAL_SMI_REG);
/* clear NO_REBOOT on DevB:3x48 p97 */
pci_read_config_word(dev, 0x48, &reg);
reg &= ~NO_REBOOT;
pci_write_config_word(dev, 0x48, reg);
spin_unlock(&amdtco_lock);
}
......@@ -146,10 +153,12 @@ static int amdtco_fop_open(struct inode *inode, struct file *file)
if (timeout > MAX_TIMEOUT)
timeout = MAX_TIMEOUT;
amdtco_disable();
amdtco_settimeout(timeout);
amdtco_global_enable();
amdtco_enable();
amdtco_ping();
printk(KERN_INFO PFX "Watchdog enabled, timeout = %d/%d seconds",
printk(KERN_INFO PFX "Watchdog enabled, timeout = %ds of %ds\n",
amdtco_gettimeout(), timeout);
return 0;
......@@ -221,7 +230,7 @@ static int amdtco_fop_release(struct inode *inode, struct file *file)
printk(KERN_INFO PFX "Watchdog disabled\n");
} else {
amdtco_ping();
printk(KERN_CRIT PFX "Unexpected close!, timeout in %d seconds)\n", timeout);
printk(KERN_CRIT PFX "Unexpected close!, timeout in %d seconds\n", timeout);
}
up(&open_sem);
......@@ -249,10 +258,9 @@ static ssize_t amdtco_fop_write(struct file *file, const char *data, size_t len,
}
#endif
amdtco_ping();
return len;
}
return 0;
return len;
}
......@@ -357,6 +365,9 @@ static int __init amdtco_setup(char *str)
if (ints[0] > 0)
timeout = ints[1];
if (!timeout || timeout > MAX_TIMEOUT)
timeout = MAX_TIMEOUT;
return 1;
}
......@@ -366,8 +377,7 @@ __setup("amd7xx_tco=", amdtco_setup);
module_init(amdtco_init);
module_exit(amdtco_exit);
MODULE_AUTHOR("Zwane Mwaikambo <zwane@commfireservices.com>");
MODULE_AUTHOR("Zwane Mwaikambo <zwane@holomorphy.com>");
MODULE_DESCRIPTION("AMD 766/768 TCO Timer Driver");
MODULE_LICENSE("GPL");
EXPORT_NO_SYMBOLS;
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