Subject: [WATCHDOG] v2.6.5 watchdog set_heartbeat + sc520_wdt.c patches
From: Wim Van Sebroeck
Date: Tue Apr 20 2004 - 17:57:04 EST
Hi Linus, Andrew,
please do a
bk pull http://linux-watchdog.bkbits.net/linux-2.6-watchdog
This will update the following files:
drivers/char/watchdog/advantechwdt.c | 21 ++
drivers/char/watchdog/alim1535_wdt.c | 9 -
drivers/char/watchdog/alim7101_wdt.c | 25 ++-
drivers/char/watchdog/i8xx_tco.c | 5
drivers/char/watchdog/pcwd_pci.c | 13 -
drivers/char/watchdog/pcwd_usb.c | 14 -
drivers/char/watchdog/sbc60xxwdt.c | 25 ++-
drivers/char/watchdog/sc520_wdt.c | 257 +++++++++++++++++------------------
drivers/char/watchdog/shwdt.c | 9 -
drivers/char/watchdog/w83627hf_wdt.c | 23 ++-
drivers/char/watchdog/w83877f_wdt.c | 21 +-
drivers/char/watchdog/wafer5823wdt.c | 23 ++-
12 files changed, 240 insertions(+), 205 deletions(-)
through these ChangeSets:
<wim@xxxxxxxxx> (04/04/20 1.1897)
[WATCHDOG] v2.6.5 set_heartbeat-patch
Extract the code to set the heartbeat in a seperate function
and use this function to set the heartbeat/timeout values in
the ioctl and the init code.
<wim@xxxxxxxxx> (04/04/20 1.1898)
[WATCHDOG] v2.6.5 sc520_wdt.c-patch1
Clean-up (general stuff: comments, keep module parameters together, ...)
Added clear definitions for the Watchdog Timer ontrol Register bits
Made start, stop and keepalive return 0 if successful
Fixed nowayout behaviour so that it is consistent with other watchdog drivers
Fixed release behaviour so that it is consistent with other watchdog drivers
Added wdt_set_heartbeat function to set the timeout/heartbeat of the watchdog
Made sure that memory remapping (wdtmrctl) is done before misc_register is started
MMCR_BASE_DEFAULT was wrong (Bug reported by Sean Young: bug 2497)
Tested by Sean Young
<sean@xxxxxxxx> (04/04/20 1.1899)
[WATCHDOG] v2.6.5 sc520_wdt.c-patch2
This patch also removes the cbar usage which is unnecessary. The MMCR is
always available at 0xfffef000; there is no need to use the cbar register
(if mmcr aliasing is enabled, then the MMCR is _also_ available at
another address set by CBAR).
The ChangeSets can also be looked at on:
http://linux-watchdog.bkbits.net:8080/linux-2.6-watchdog
For completeness, I added the patches below.
Greetings,
Wim.
================================================================================
diff -Nru a/drivers/char/watchdog/advantechwdt.c b/drivers/char/watchdog/advantechwdt.c
--- a/drivers/char/watchdog/advantechwdt.c Tue Apr 20 22:04:37 2004
+++ b/drivers/char/watchdog/advantechwdt.c Tue Apr 20 22:04:37 2004
@@ -99,6 +99,16 @@
inb_p(wdt_stop);
}
+static int
+advwdt_set_heartbeat(int t)
+{
+ if ((t < 1) || (t > 63))
+ return -EINVAL;
+
+ timeout = t;
+ return 0;
+}
+
static ssize_t
advwdt_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
{
@@ -153,9 +163,8 @@
case WDIOC_SETTIMEOUT:
if (get_user(new_timeout, (int *)arg))
return -EFAULT;
- if ((new_timeout < 1) || (new_timeout > 63))
+ if (advwdt_set_heartbeat(new_timeout))
return -EINVAL;
- timeout = new_timeout;
advwdt_ping();
/* Fall */
@@ -265,10 +274,10 @@
printk(KERN_INFO "WDT driver for Advantech single board computer initialising.\n");
- if (timeout < 1 || timeout > 63) {
- timeout = WATCHDOG_TIMEOUT;
- printk (KERN_INFO PFX "timeout value must be 1<=x<=63, using %d\n",
- timeout);
+ if (advwdt_set_heartbeat(timeout)) {
+ advwdt_set_heartbeat(WATCHDOG_TIMEOUT);
+ printk (KERN_INFO PFX "timeout value must be 1<=timeout<=63, using %d\n",
+ WATCHDOG_TIMEOUT);
}
if (wdt_stop != wdt_start) {
diff -Nru a/drivers/char/watchdog/alim1535_wdt.c b/drivers/char/watchdog/alim1535_wdt.c
--- a/drivers/char/watchdog/alim1535_wdt.c Tue Apr 20 22:04:37 2004
+++ b/drivers/char/watchdog/alim1535_wdt.c Tue Apr 20 22:04:37 2004
@@ -406,14 +406,11 @@
}
/* Check that the timeout value is within it's range ; if not reset to the default */
- if (timeout < 1 || timeout >= 18000) {
- timeout = WATCHDOG_TIMEOUT;
+ if (ali_settimer(timeout)) {
+ ali_settimer(WATCHDOG_TIMEOUT);
printk(KERN_INFO PFX "timeout value must be 0<timeout<18000, using %d\n",
- timeout);
+ WATCHDOG_TIMEOUT);
}
-
- /* Calculate the watchdog's timeout */
- ali_settimer(timeout);
ret = misc_register(&ali_miscdev);
if (ret != 0) {
diff -Nru a/drivers/char/watchdog/alim7101_wdt.c b/drivers/char/watchdog/alim7101_wdt.c
--- a/drivers/char/watchdog/alim7101_wdt.c Tue Apr 20 22:04:37 2004
+++ b/drivers/char/watchdog/alim7101_wdt.c Tue Apr 20 22:04:37 2004
@@ -143,6 +143,15 @@
next_heartbeat = jiffies + (timeout * HZ);
}
+static int wdt_set_heartbeat(int t)
+{
+ if ((t < 1) || (t > 3600)) /* arbitrary upper limit */
+ return -EINVAL;
+
+ timeout = t;
+ return 0;
+}
+
/*
* /dev/watchdog handling
*/
@@ -245,10 +254,9 @@
if(get_user(new_timeout, (int *)arg))
return -EFAULT;
- if(new_timeout < 1 || new_timeout > 3600) /* arbitrary upper limit */
+ if(wdt_set_heartbeat(new_timeout))
return -EINVAL;
- timeout = new_timeout;
wdt_keepalive();
/* Fall through */
}
@@ -340,16 +348,15 @@
return -EBUSY;
}
- if(timeout < 1 || timeout > 3600) /* arbitrary upper limit */
- {
- timeout = WATCHDOG_TIMEOUT;
- printk(KERN_INFO PFX "timeout value must be 1<=x<=3600, using %d\n",
- timeout);
- }
-
init_timer(&timer);
timer.function = wdt_timer_ping;
timer.data = 1;
+
+ if (wdt_set_heartbeat(timeout)) {
+ wdt_set_heartbeat(WATCHDOG_TIMEOUT);
+ printk(KERN_INFO PFX "timeout value must be 1<=timeout<=3600, using %d\n",
+ WATCHDOG_TIMEOUT);
+ }
rc = misc_register(&wdt_miscdev);
if (rc) {
diff -Nru a/drivers/char/watchdog/i8xx_tco.c b/drivers/char/watchdog/i8xx_tco.c
--- a/drivers/char/watchdog/i8xx_tco.c Tue Apr 20 22:04:37 2004
+++ b/drivers/char/watchdog/i8xx_tco.c Tue Apr 20 22:04:37 2004
@@ -447,10 +447,9 @@
/* 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);
+ tco_timer_set_heartbeat (WATCHDOG_HEARTBEAT);
printk(KERN_INFO PFX "heartbeat value must be 2<heartbeat<39, using %d\n",
- heartbeat);
+ WATCHDOG_HEARTBEAT);
}
ret = register_reboot_notifier(&i8xx_tco_notifier);
diff -Nru a/drivers/char/watchdog/pcwd_pci.c b/drivers/char/watchdog/pcwd_pci.c
--- a/drivers/char/watchdog/pcwd_pci.c Tue Apr 20 22:04:37 2004
+++ b/drivers/char/watchdog/pcwd_pci.c Tue Apr 20 22:04:37 2004
@@ -49,7 +49,7 @@
/* Module and version information */
#define WATCHDOG_VERSION "1.00"
-#define WATCHDOG_DATE "13/03/2004"
+#define WATCHDOG_DATE "18 Apr 2004"
#define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog"
#define WATCHDOG_NAME "pcwd_pci"
#define PFX WATCHDOG_NAME ": "
@@ -73,7 +73,7 @@
#define WD_PCI_TTRP 0x04 /* Temperature Trip status */
/* according to documentation max. time to process a command for the pci
- watchdog card is 100 ms, so we give it 150 ms to do it's job */
+ * watchdog card is 100 ms, so we give it 150 ms to do it's job */
#define PCI_COMMAND_TIMEOUT 150
/* Watchdog's internal commands */
@@ -585,14 +585,11 @@
printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n");
/* Check that the heartbeat value is within it's range ; if not reset to the default */
- if (heartbeat < 1 || heartbeat > 0xFFFF) {
- heartbeat = WATCHDOG_HEARTBEAT;
+ if (pcipcwd_set_heartbeat(heartbeat)) {
+ pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
- heartbeat);
+ WATCHDOG_HEARTBEAT);
}
-
- /* Calculate the watchdog's heartbeat */
- pcipcwd_set_heartbeat(heartbeat);
ret = register_reboot_notifier(&pcipcwd_notifier);
if (ret != 0) {
diff -Nru a/drivers/char/watchdog/pcwd_usb.c b/drivers/char/watchdog/pcwd_usb.c
--- a/drivers/char/watchdog/pcwd_usb.c Tue Apr 20 22:04:37 2004
+++ b/drivers/char/watchdog/pcwd_usb.c Tue Apr 20 22:04:37 2004
@@ -56,7 +56,8 @@
/* Module and Version Information */
-#define DRIVER_VERSION "v1.00 (28/02/2004)"
+#define DRIVER_VERSION "1.00"
+#define DRIVER_DATE "18 Apr 2004"
#define DRIVER_AUTHOR "Wim Van Sebroeck <wim@xxxxxxxxx>"
#define DRIVER_DESC "Berkshire USB-PC Watchdog driver"
#define DRIVER_LICENSE "GPL"
@@ -681,15 +682,12 @@
((option_switches & 0x08) ? "ON" : "OFF"));
/* Check that the heartbeat value is within it's range ; if not reset to the default */
- if (heartbeat < 1 || heartbeat > 0xFFFF) {
- heartbeat = WATCHDOG_HEARTBEAT;
+ if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) {
+ usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT);
printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
- heartbeat);
+ WATCHDOG_HEARTBEAT);
}
- /* Calculate the watchdog's heartbeat */
- usb_pcwd_set_heartbeat(usb_pcwd, heartbeat);
-
retval = register_reboot_notifier(&usb_pcwd_notifier);
if (retval != 0) {
printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
@@ -791,7 +789,7 @@
return result;
}
- printk(KERN_INFO PFX DRIVER_DESC " " DRIVER_VERSION "\n");
+ printk(KERN_INFO PFX DRIVER_DESC " v" DRIVER_VERSION " (" DRIVER_DATE ")\n");
return 0;
}
diff -Nru a/drivers/char/watchdog/sbc60xxwdt.c b/drivers/char/watchdog/sbc60xxwdt.c
--- a/drivers/char/watchdog/sbc60xxwdt.c Tue Apr 20 22:04:37 2004
+++ b/drivers/char/watchdog/sbc60xxwdt.c Tue Apr 20 22:04:37 2004
@@ -162,6 +162,15 @@
next_heartbeat = jiffies + (timeout * HZ);
}
+static int wdt_set_heartbeat(int t)
+{
+ if ((t < 1) || (t > 3600)) /* arbitrary upper limit */
+ return -EINVAL;
+
+ timeout = t;
+ return 0;
+}
+
/*
* /dev/watchdog handling
*/
@@ -275,10 +284,9 @@
if(get_user(new_timeout, (int *)arg))
return -EFAULT;
- if(new_timeout < 1 || new_timeout > 3600) /* arbitrary upper limit */
+ if(wdt_set_heartbeat(new_timeout))
return -EINVAL;
- timeout = new_timeout;
wdt_keepalive();
/* Fall through */
}
@@ -341,13 +349,6 @@
{
int rc = -EBUSY;
- if(timeout < 1 || timeout > 3600) /* arbitrary upper limit */
- {
- timeout = WATCHDOG_TIMEOUT;
- printk(KERN_INFO PFX "timeout value must be 1<=x<=3600, using %d\n",
- timeout);
- }
-
if (!request_region(wdt_start, 1, "SBC 60XX WDT"))
{
printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
@@ -371,6 +372,12 @@
init_timer(&timer);
timer.function = wdt_timer_ping;
timer.data = 0;
+
+ if (wdt_set_heartbeat(timeout)) {
+ wdt_set_heartbeat(WATCHDOG_TIMEOUT);
+ printk(KERN_INFO PFX "timeout value must be 1<=timeout<=3600, using %d\n",
+ WATCHDOG_TIMEOUT);
+ }
rc = misc_register(&wdt_miscdev);
if (rc)
diff -Nru a/drivers/char/watchdog/shwdt.c b/drivers/char/watchdog/shwdt.c
--- a/drivers/char/watchdog/shwdt.c Tue Apr 20 22:04:37 2004
+++ b/drivers/char/watchdog/shwdt.c Tue Apr 20 22:04:37 2004
@@ -395,11 +395,10 @@
clock_division_ratio);
}
- if (sh_wdt_set_heartbeat(heartbeat))
- {
- heartbeat = WATCHDOG_HEARTBEAT;
- printk(KERN_INFO PFX "heartbeat value must be 1<=x<=3600, using %d\n",
- heartbeat);
+ if (sh_wdt_set_heartbeat(heartbeat)) {
+ sh_wdt_set_heartbeat(WATCHDOG_HEARTBEAT);
+ printk(KERN_INFO PFX "heartbeat value must be 1<=heartbeat<=3600, using %d\n",
+ WATCHDOG_HEARTBEAT);
}
init_timer(&timer);
diff -Nru a/drivers/char/watchdog/w83627hf_wdt.c b/drivers/char/watchdog/w83627hf_wdt.c
--- a/drivers/char/watchdog/w83627hf_wdt.c Tue Apr 20 22:04:37 2004
+++ b/drivers/char/watchdog/w83627hf_wdt.c Tue Apr 20 22:04:37 2004
@@ -100,6 +100,16 @@
wdt_ctrl(0);
}
+static int
+wdt_set_heartbeat(int t)
+{
+ if ((t < 1) || (t > 63))
+ return -EINVAL;
+
+ timeout = t;
+ return 0;
+}
+
static ssize_t
wdt_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
{
@@ -154,9 +164,8 @@
case WDIOC_SETTIMEOUT:
if (get_user(new_timeout, (int *)arg))
return -EFAULT;
- if ((new_timeout < 1) || (new_timeout > 63))
+ if (wdt_set_heartbeat(new_timeout))
return -EINVAL;
- timeout = new_timeout;
wdt_ping();
/* Fall */
@@ -264,12 +273,12 @@
{
int ret;
- printk(KERN_INFO "WDT driver for Advantech single board computer initialising.\n");
+ printk(KERN_INFO "WDT driver for the Winbond(TM) W83627HF Super I/O chip initialising.\n");
- if (timeout < 1 || timeout > 63) {
- timeout = WATCHDOG_TIMEOUT;
- printk (KERN_INFO PFX "timeout value must be 1<=x<=63, using %d\n",
- timeout);
+ if (wdt_set_heartbeat(timeout)) {
+ wdt_set_heartbeat(WATCHDOG_TIMEOUT);
+ printk (KERN_INFO PFX "timeout value must be 1<=timeout<=63, using %d\n",
+ WATCHDOG_TIMEOUT);
}
if (!request_region(wdt_io, 1, WATCHDOG_NAME)) {
diff -Nru a/drivers/char/watchdog/w83877f_wdt.c b/drivers/char/watchdog/w83877f_wdt.c
--- a/drivers/char/watchdog/w83877f_wdt.c Tue Apr 20 22:04:37 2004
+++ b/drivers/char/watchdog/w83877f_wdt.c Tue Apr 20 22:04:37 2004
@@ -184,6 +184,15 @@
next_heartbeat = jiffies + (timeout * HZ);
}
+static int wdt_set_heartbeat(int t)
+{
+ if ((t < 1) || (t > 3600)) /* arbitrary upper limit */
+ return -EINVAL;
+
+ timeout = t;
+ return 0;
+}
+
/*
* /dev/watchdog handling
*/
@@ -294,10 +303,9 @@
if(get_user(new_timeout, (int *)arg))
return -EFAULT;
- if(new_timeout < 1 || new_timeout > 3600) /* arbitrary upper limit */
+ if(wdt_set_heartbeat(new_timeout))
return -EINVAL;
- timeout = new_timeout;
wdt_keepalive();
/* Fall through */
}
@@ -361,11 +369,10 @@
spin_lock_init(&wdt_spinlock);
- if(timeout < 1 || timeout > 3600) /* arbitrary upper limit */
- {
- timeout = WATCHDOG_TIMEOUT;
- printk(KERN_INFO PFX "timeout value must be 1<=x<=3600, using %d\n",
- timeout);
+ if (wdt_set_heartbeat(timeout)) {
+ wdt_set_heartbeat(WATCHDOG_TIMEOUT);
+ printk(KERN_INFO PFX "timeout value must be 1<=timeout<=3600, using %d\n",
+ WATCHDOG_TIMEOUT);
}
if (!request_region(ENABLE_W83877F_PORT, 2, "W83877F WDT"))
diff -Nru a/drivers/char/watchdog/wafer5823wdt.c b/drivers/char/watchdog/wafer5823wdt.c
--- a/drivers/char/watchdog/wafer5823wdt.c Tue Apr 20 22:04:37 2004
+++ b/drivers/char/watchdog/wafer5823wdt.c Tue Apr 20 22:04:37 2004
@@ -88,13 +88,21 @@
inb_p(wdt_start);
}
-static void
-wafwdt_stop(void)
+static void wafwdt_stop(void)
{
/* stop watchdog */
inb_p(wdt_stop);
}
+static int wafwdt_set_heartbeat(int t)
+{
+ if ((t < 1) || (t > 255)) /* arbitrary upper limit */
+ return -EINVAL;
+
+ timeout = t;
+ return 0;
+}
+
static ssize_t wafwdt_write(struct file *file, const char *buf, size_t count, loff_t * ppos)
{
/* Can't seek (pwrite) on this device */
@@ -152,9 +160,8 @@
case WDIOC_SETTIMEOUT:
if (get_user(new_timeout, (int *)arg))
return -EFAULT;
- if ((new_timeout < 1) || (new_timeout > 255))
+ if (wafwdt_set_heartbeat(new_timeout))
return -EINVAL;
- timeout = new_timeout;
wafwdt_stop();
wafwdt_start();
/* Fall */
@@ -262,10 +269,10 @@
spin_lock_init(&wafwdt_lock);
- if (timeout < 1 || timeout > 255) {
- timeout = WD_TIMO;
- printk (KERN_INFO PFX "timeout value must be 1<=x<=255, using %d\n",
- timeout);
+ if (wafwdt_set_heartbeat(timeout)) {
+ wafwdt_set_heartbeat(WD_TIMO);
+ printk (KERN_INFO PFX "timeout value must be 1<=timeout<=255, using %d\n",
+ WD_TIMO);
}
if (wdt_stop != wdt_start) {
diff -Nru a/drivers/char/watchdog/sc520_wdt.c b/drivers/char/watchdog/sc520_wdt.c
--- a/drivers/char/watchdog/sc520_wdt.c Tue Apr 20 22:05:02 2004
+++ b/drivers/char/watchdog/sc520_wdt.c Tue Apr 20 22:05:02 2004
@@ -23,22 +23,23 @@
* - Switched to private locks not lock_kernel
* - Used ioremap/writew/readw
* - Added NOWAYOUT support
- *
- * 4/12 - 2002 Changes by Rob Radez <rob@xxxxxxxxxxxxxx>
- * - Change comments
- * - Eliminate fop_llseek
- * - Change CONFIG_WATCHDOG_NOWAYOUT semantics
- * - Add KERN_* tags to printks
- * - fix possible wdt_is_open race
- * - Report proper capabilities in watchdog_info
- * - Add WDIOC_{GETSTATUS, GETBOOTSTATUS, SETTIMEOUT,
- * GETTIMEOUT, SETOPTIONS} ioctls
- * 09/8 - 2003 Changes by Wim Van Sebroeck <wim@xxxxxxxxx>
- * - cleanup of trailing spaces
- * - added extra printk's for startup problems
- * - use module_param
- * - made timeout (the emulated heartbeat) a module_param
- * - made the keepalive ping an internal subroutine
+ * 4/12 - 2002 Changes by Rob Radez <rob@xxxxxxxxxxxxxx>
+ * - Change comments
+ * - Eliminate fop_llseek
+ * - Change CONFIG_WATCHDOG_NOWAYOUT semantics
+ * - Add KERN_* tags to printks
+ * - fix possible wdt_is_open race
+ * - Report proper capabilities in watchdog_info
+ * - Add WDIOC_{GETSTATUS, GETBOOTSTATUS, SETTIMEOUT,
+ * GETTIMEOUT, SETOPTIONS} ioctls
+ * 09/8 - 2003 Changes by Wim Van Sebroeck <wim@xxxxxxxxx>
+ * - cleanup of trailing spaces
+ * - added extra printk's for startup problems
+ * - use module_param
+ * - made timeout (the emulated heartbeat) a module_param
+ * - made the keepalive ping an internal subroutine
+ * 3/27 - 2004 Changes by Sean Young <sean@xxxxxxxx>
+ * - set MMCR_BASE_DEFAULT to 0xfffef000
*
* This WDT driver is different from most other Linux WDT
* drivers in that the driver will ping the watchdog by itself,
@@ -65,8 +66,16 @@
#include <asm/uaccess.h>
#include <asm/system.h>
+#define OUR_NAME "sc520_wdt"
+#define PFX OUR_NAME ": "
+
/*
- * The SC520 can timeout anywhere from 492us to 32.21s.
+ * The AMD Elan SC520 timeout value is 492us times a power of 2 (0-7)
+ *
+ * 0: 492us 2: 1.01s 4: 4.03s 6: 16.22s
+ * 1: 503ms 3: 2.01s 5: 8.05s 7: 32.21s
+ *
+ * We will program the SC520 watchdog for a timeout of 2.01s.
* If we reset the watchdog every ~250ms we should be safe.
*/
@@ -83,25 +92,33 @@
module_param(timeout, int, 0);
MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. (1<=timeout<=3600, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
-/*
- * AMD Elan SC520 timeout value is 492us times a power of 2 (0-7)
- *
- * 0: 492us 2: 1.01s 4: 4.03s 6: 16.22s
- * 1: 503ms 3: 2.01s 5: 8.05s 7: 32.21s
- */
-
-#define TIMEOUT_EXPONENT ( 1 << 3 ) /* 0x08 = 2.01s */
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
-/* #define MMCR_BASE_DEFAULT 0xfffef000 */
-#define MMCR_BASE_DEFAULT ((__u16 *)0xffffe)
-#define OFFS_WDTMRCTL ((unsigned int)0xcb0)
-#define WDT_ENB 0x8000 /* [15] Watchdog Timer Enable */
-#define WDT_WRST_ENB 0x4000 /* [14] Watchdog Timer Reset Enable */
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
-#define OUR_NAME "sc520_wdt"
-#define PFX OUR_NAME ": "
+/*
+ * AMD Elan SC520 - Watchdog Timer Registers
+ */
+#define MMCR_BASE_DEFAULT 0xfffef000 /* The default base address */
+#define OFFS_WDTMRCTL 0xCB0 /* Watchdog Timer Control Register */
-#define WRT_DOG(data) *wdtmrctl=data
+/* WDT Control Register bit definitions */
+#define WDT_EXP_SEL_01 0x0001 /* [01] Time-out = 496 us (with 33 Mhz clk). */
+#define WDT_EXP_SEL_02 0x0002 /* [02] Time-out = 508 ms (with 33 Mhz clk). */
+#define WDT_EXP_SEL_03 0x0004 /* [03] Time-out = 1.02 s (with 33 Mhz clk). */
+#define WDT_EXP_SEL_04 0x0008 /* [04] Time-out = 2.03 s (with 33 Mhz clk). */
+#define WDT_EXP_SEL_05 0x0010 /* [05] Time-out = 4.07 s (with 33 Mhz clk). */
+#define WDT_EXP_SEL_06 0x0020 /* [06] Time-out = 8.13 s (with 33 Mhz clk). */
+#define WDT_EXP_SEL_07 0x0040 /* [07] Time-out = 16.27s (with 33 Mhz clk). */
+#define WDT_EXP_SEL_08 0x0080 /* [08] Time-out = 32.54s (with 33 Mhz clk). */
+#define WDT_IRQ_FLG 0x1000 /* [12] Interrupt Request Flag */
+#define WDT_WRST_ENB 0x4000 /* [14] Watchdog Timer Reset Enable */
+#define WDT_ENB 0x8000 /* [15] Watchdog Timer Enable */
static __u16 *wdtmrctl;
@@ -112,15 +129,6 @@
static char wdt_expect_close;
static spinlock_t wdt_spinlock;
-#ifdef CONFIG_WATCHDOG_NOWAYOUT
-static int nowayout = 1;
-#else
-static int nowayout = 0;
-#endif
-
-module_param(nowayout, int, 0);
-MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
-
/*
* Whack the dog
*/
@@ -147,7 +155,7 @@
}
/*
- * Utility routines
+ * Utility routines
*/
static void wdt_config(int writeval)
@@ -157,10 +165,10 @@
/* buy some time (ping) */
spin_lock_irqsave(&wdt_spinlock, flags);
- dummy=readw(wdtmrctl); /* ensure write synchronization */
+ dummy=readw(wdtmrctl); /* ensure write synchronization */
writew(0xAAAA, wdtmrctl);
writew(0x5555, wdtmrctl);
- /* make WDT configuration register writable one time */
+ /* unlock WDT = make WDT configuration register writable one time */
writew(0x3333, wdtmrctl);
writew(0xCCCC, wdtmrctl);
/* write WDT configuration register */
@@ -168,7 +176,7 @@
spin_unlock_irqrestore(&wdt_spinlock, flags);
}
-static void wdt_startup(void)
+static int wdt_startup(void)
{
next_heartbeat = jiffies + (timeout * HZ);
@@ -176,28 +184,43 @@
timer.expires = jiffies + WDT_INTERVAL;
add_timer(&timer);
- wdt_config(WDT_ENB | WDT_WRST_ENB | TIMEOUT_EXPONENT);
+ /* Start the watchdog */
+ wdt_config(WDT_ENB | WDT_WRST_ENB | WDT_EXP_SEL_04);
+
printk(KERN_INFO PFX "Watchdog timer is now enabled.\n");
+ return 0;
}
-static void wdt_turnoff(void)
+static int wdt_turnoff(void)
{
- if (!nowayout) {
- /* Stop the timer */
- del_timer(&timer);
- wdt_config(0);
- printk(KERN_INFO PFX "Watchdog timer is now disabled...\n");
- }
+ /* Stop the timer */
+ del_timer(&timer);
+
+ /* Stop the watchdog */
+ wdt_config(0);
+
+ printk(KERN_INFO PFX "Watchdog timer is now disabled...\n");
+ return 0;
}
-static void wdt_keepalive(void)
+static int wdt_keepalive(void)
{
/* user land ping */
next_heartbeat = jiffies + (timeout * HZ);
+ return 0;
+}
+
+static int wdt_set_heartbeat(int t)
+{
+ if ((t < 1) || (t > 3600)) /* arbitrary upper limit */
+ return -EINVAL;
+
+ timeout = t;
+ return 0;
}
/*
- * /dev/watchdog handling
+ * /dev/watchdog handling
*/
static ssize_t fop_write(struct file * file, const char * buf, size_t count, loff_t * ppos)
@@ -207,10 +230,8 @@
return -ESPIPE;
/* See if we got the magic character 'V' and reload the timer */
- if(count)
- {
- if (!nowayout)
- {
+ if(count) {
+ if (!nowayout) {
size_t ofs;
/* note: just in case someone wrote the magic character
@@ -248,11 +269,11 @@
static int fop_close(struct inode * inode, struct file * file)
{
- if(wdt_expect_close == 42)
+ if(wdt_expect_close == 42) {
wdt_turnoff();
- else {
- del_timer(&timer);
- printk(KERN_CRIT PFX "device file closed unexpectedly. Will not stop the WDT!\n");
+ } else {
+ printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
+ wdt_keepalive();
}
clear_bit(0, &wdt_is_open);
wdt_expect_close = 0;
@@ -262,8 +283,7 @@
static int fop_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
unsigned long arg)
{
- static struct watchdog_info ident=
- {
+ static struct watchdog_info ident = {
.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
.firmware_version = 1,
.identity = "SC520",
@@ -307,10 +327,9 @@
if(get_user(new_timeout, (int *)arg))
return -EFAULT;
- if(new_timeout < 1 || new_timeout > 3600) /* arbitrary upper limit */
+ if(wdt_set_heartbeat(new_timeout))
return -EINVAL;
- timeout = new_timeout;
wdt_keepalive();
/* Fall through */
}
@@ -351,81 +370,77 @@
* turn the timebomb registers off.
*/
-static struct notifier_block wdt_notifier=
-{
+static struct notifier_block wdt_notifier = {
.notifier_call = wdt_notify_sys,
};
static void __exit sc520_wdt_unload(void)
{
- wdt_turnoff();
+ if (!nowayout)
+ wdt_turnoff();
/* Deregister */
misc_deregister(&wdt_miscdev);
- iounmap(wdtmrctl);
unregister_reboot_notifier(&wdt_notifier);
+ iounmap(wdtmrctl);
}
static int __init sc520_wdt_init(void)
{
int rc = -EBUSY;
unsigned long cbar;
+ unsigned long MMCR_BASE;
spin_lock_init(&wdt_spinlock);
- if(timeout < 1 || timeout > 3600) /* arbitrary upper limit */
- {
- timeout = WATCHDOG_TIMEOUT;
- printk(KERN_INFO PFX "timeout value must be 1<=x<=3600, using %d\n",
- timeout);
- }
-
init_timer(&timer);
timer.function = wdt_timer_ping;
timer.data = 0;
- rc = misc_register(&wdt_miscdev);
- if (rc)
- {
- printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
- wdt_miscdev.minor, rc);
- goto err_out_region2;
- }
-
- rc = register_reboot_notifier(&wdt_notifier);
- if (rc)
- {
- printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
- rc);
- goto err_out_miscdev;
+ /* Check that the timeout value is within it's range ; if not reset to the default */
+ if (wdt_set_heartbeat(timeout)) {
+ wdt_set_heartbeat(WATCHDOG_TIMEOUT);
+ printk(KERN_INFO PFX "timeout value must be 1<=timeout<=3600, using %d\n",
+ WATCHDOG_TIMEOUT);
}
- /* get the Base Address Register */
+ /* get the Base Address Register:
+ * If the ENB bit [31] of CBAR is set => MMCR alias is enabled and MMCR base address is
+ * the contents of CBAR[29-12].
+ * if ENB bit is 0 => MMCR alias is disabled and the MMCR base address is the default
+ * value. */
cbar = inl_p(0xfffc);
printk(KERN_INFO PFX "CBAR: 0x%08lx\n", cbar);
/* check if MMCR aliasing bit is set */
if (cbar & 0x80000000) {
printk(KERN_INFO PFX "MMCR Aliasing enabled.\n");
- wdtmrctl = (__u16 *)(cbar & 0x3fffffff);
+ MMCR_BASE = (cbar & 0x3fffffff);
} else {
- printk(KERN_INFO PFX "!!! WARNING !!!\n"
- "\t MMCR Aliasing found NOT enabled!\n"
- "\t Using default value of: %p\n"
- "\t This has not been tested!\n"
- "\t Please email Scott Jennings <smj@xxxxxxx>\n"
- "\t and Bill Jennings <bj@xxxxxxx> if it works!\n"
- , MMCR_BASE_DEFAULT
- );
- wdtmrctl = MMCR_BASE_DEFAULT;
+ printk(KERN_INFO PFX "MMCR Aliasing NOT enabled. Using default value.\n");
+ MMCR_BASE = MMCR_BASE_DEFAULT;
}
- wdtmrctl = (__u16 *)((char *)wdtmrctl + OFFS_WDTMRCTL);
- wdtmrctl = ioremap((unsigned long)wdtmrctl, 2);
+ wdtmrctl = ioremap((unsigned long)(MMCR_BASE + OFFS_WDTMRCTL), 2);
if (!wdtmrctl) {
- printk (KERN_ERR PFX "Unable to remap memory.\n");
+ printk(KERN_ERR PFX "Unable to remap memory\n");
rc = -ENOMEM;
+ goto err_out_region2;
+ }
+
+ rc = register_reboot_notifier(&wdt_notifier);
+ if (rc) {
+ printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
+ rc);
+ goto err_out_ioremap;
+ }
+
+ rc = misc_register(&wdt_miscdev);
+ if (rc) {
+ printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+ WATCHDOG_MINOR, rc);
goto err_out_notifier;
}
+
printk(KERN_INFO PFX "WDT driver for SC520 initialised. timeout=%d sec (nowayout=%d)\n",
timeout,nowayout);
@@ -433,8 +448,8 @@
err_out_notifier:
unregister_reboot_notifier(&wdt_notifier);
-err_out_miscdev:
- misc_deregister(&wdt_miscdev);
+err_out_ioremap:
+ iounmap(wdtmrctl);
err_out_region2:
return rc;
}
diff -Nru a/drivers/char/watchdog/sc520_wdt.c b/drivers/char/watchdog/sc520_wdt.c
--- a/drivers/char/watchdog/sc520_wdt.c Tue Apr 20 22:05:27 2004
+++ b/drivers/char/watchdog/sc520_wdt.c Tue Apr 20 22:05:27 2004
@@ -39,7 +39,9 @@
* - made timeout (the emulated heartbeat) a module_param
* - made the keepalive ping an internal subroutine
* 3/27 - 2004 Changes by Sean Young <sean@xxxxxxxx>
- * - set MMCR_BASE_DEFAULT to 0xfffef000
+ * - set MMCR_BASE to 0xfffef000
+ * - CBAR does not need to be read
+ * - removed debugging printks
*
* This WDT driver is different from most other Linux WDT
* drivers in that the driver will ping the watchdog by itself,
@@ -104,7 +106,7 @@
/*
* AMD Elan SC520 - Watchdog Timer Registers
*/
-#define MMCR_BASE_DEFAULT 0xfffef000 /* The default base address */
+#define MMCR_BASE 0xfffef000 /* The default base address */
#define OFFS_WDTMRCTL 0xCB0 /* Watchdog Timer Control Register */
/* WDT Control Register bit definitions */
@@ -388,8 +390,6 @@
static int __init sc520_wdt_init(void)
{
int rc = -EBUSY;
- unsigned long cbar;
- unsigned long MMCR_BASE;
spin_lock_init(&wdt_spinlock);
@@ -402,22 +402,6 @@
wdt_set_heartbeat(WATCHDOG_TIMEOUT);
printk(KERN_INFO PFX "timeout value must be 1<=timeout<=3600, using %d\n",
WATCHDOG_TIMEOUT);
- }
-
- /* get the Base Address Register:
- * If the ENB bit [31] of CBAR is set => MMCR alias is enabled and MMCR base address is
- * the contents of CBAR[29-12].
- * if ENB bit is 0 => MMCR alias is disabled and the MMCR base address is the default
- * value. */
- cbar = inl_p(0xfffc);
- printk(KERN_INFO PFX "CBAR: 0x%08lx\n", cbar);
- /* check if MMCR aliasing bit is set */
- if (cbar & 0x80000000) {
- printk(KERN_INFO PFX "MMCR Aliasing enabled.\n");
- MMCR_BASE = (cbar & 0x3fffffff);
- } else {
- printk(KERN_INFO PFX "MMCR Aliasing NOT enabled. Using default value.\n");
- MMCR_BASE = MMCR_BASE_DEFAULT;
}
wdtmrctl = ioremap((unsigned long)(MMCR_BASE + OFFS_WDTMRCTL), 2);
-
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