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authornbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73>2007-12-24 22:47:27 +0000
committernbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73>2007-12-24 22:47:27 +0000
commit0d5a134b783b7743a7ec70b5f43da2eeda3850a1 (patch)
tree954f0828ba02cd2558391d4c40e1ac646f0383be
parent54dcc5811d2a1728a6cc5cb468ac738e6ba5208a (diff)
watchdog driver for RB 532
Here is the driver for the hardware watchdog timer integrated in RB 532 (as part of the SoC IDT 79RC32434). File include/asm-mips/rc32434/integ.h is taken from Mikrotik RB 532 kernel patch. Signed-off-by: Ondrej Zajicek <santiago@crfreenet.org> git-svn-id: svn://svn.openwrt.org/openwrt/trunk@9896 3c298f89-4303-0410-b956-a3cf2f4a3e73
-rw-r--r--target/linux/rb532/files/drivers/char/watchdog/rc32434_wdt.c240
-rw-r--r--target/linux/rb532/files/include/asm-mips/rc32434/integ.h76
-rw-r--r--target/linux/rb532/patches/520-rc32434_wdt.patch43
3 files changed, 359 insertions, 0 deletions
diff --git a/target/linux/rb532/files/drivers/char/watchdog/rc32434_wdt.c b/target/linux/rb532/files/drivers/char/watchdog/rc32434_wdt.c
new file mode 100644
index 0000000000..2266329def
--- /dev/null
+++ b/target/linux/rb532/files/drivers/char/watchdog/rc32434_wdt.c
@@ -0,0 +1,240 @@
+/*
+ * RC32434_WDT 0.01: IDT Interprise 79RC32434 watchdog driver
+ * Copyright (c) Ondrej Zajicek <santiago@crfreenet.org>, 2006
+ *
+ * based on
+ *
+ * SoftDog 0.05: A Software Watchdog Device
+ *
+ * (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/reboot.h>
+#include <linux/smp_lock.h>
+#include <linux/init.h>
+#include <asm/bootinfo.h>
+#include <asm/time.h>
+#include <asm/uaccess.h>
+#include <asm/rc32434/integ.h>
+
+#define DEFAULT_TIMEOUT 15 /* (secs) Default is 15 seconds */
+#define MAX_TIMEOUT 20
+/*
+ * (secs) Max is 20 seconds
+ * (max frequency of counter is ~200 MHz, counter is 32-bit unsigned int)
+ */
+
+#define NAME "rc32434_wdt"
+#define VERSION "0.1"
+
+static INTEG_t rc_wdt = (INTEG_t) INTEG_VirtualAddress;
+
+static int expect_close = 0;
+static int access = 0;
+static int timeout = 0;
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+MODULE_LICENSE("GPL");
+
+
+static inline void start_wdt(void)
+{
+ rc_wdt -> wtcount = 0;
+ rc_wdt -> errcs |= ERRCS_wre_m;
+ rc_wdt -> wtc |= WTC_en_m;
+}
+
+static inline void stop_wdt(void)
+{
+ rc_wdt -> wtc &= ~WTC_en_m;
+ rc_wdt -> errcs &= ~ERRCS_wre_m;
+}
+
+static inline void set_wdt(int new_timeout)
+{
+ u32 cmp = new_timeout * mips_hpt_frequency;
+ u32 state;
+
+ timeout = new_timeout;
+ /*
+ * store and disable WTC
+ */
+ state = rc_wdt -> wtc & WTC_en_m;
+ rc_wdt -> wtc &= ~WTC_en_m;
+
+ rc_wdt -> wtcount = 0;
+ rc_wdt -> wtcompare = cmp;
+
+ /*
+ * restore WTC
+ */
+ rc_wdt -> wtc |= state;
+}
+
+static inline void update_wdt(void)
+{
+ rc_wdt -> wtcount = 0;
+}
+
+/*
+ * Allow only one person to hold it open
+ */
+
+static int wdt_open(struct inode *inode, struct file *file)
+{
+ if (access)
+ return -EBUSY;
+ if (nowayout) {
+ __module_get(THIS_MODULE);
+ }
+ /*
+ * Activate timer
+ */
+ start_wdt();
+ printk(KERN_INFO NAME ": enabling watchdog timer\n");
+ access = 1;
+ return 0;
+}
+
+static int wdt_release(struct inode *inode, struct file *file)
+{
+ /*
+ * Shut off the timer.
+ * Lock it in if it's a module and we set nowayout
+ */
+ if (expect_close && nowayout == 0) {
+ stop_wdt ();
+ printk(KERN_INFO NAME ": disabling watchdog timer\n");
+ module_put(THIS_MODULE);
+ } else {
+ printk (KERN_CRIT NAME ": device closed unexpectedly. WDT will not stop!\n");
+ }
+ access = 0;
+ return 0;
+}
+
+static ssize_t wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos)
+{
+ /*
+ * Refresh the timer.
+ */
+ if (len) {
+ if (!nowayout) {
+ size_t i;
+
+ /* In case it was set long ago */
+ expect_close = 0;
+
+ for (i = 0; i != len; i++) {
+ char c;
+ if (get_user(c, data + i))
+ return -EFAULT;
+ if (c == 'V')
+ expect_close = 1;
+ }
+ }
+ update_wdt ();
+ return len;
+ }
+ return 0;
+}
+
+static int wdt_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ int new_timeout;
+ static struct watchdog_info ident = {
+ .options = WDIOF_SETTIMEOUT |
+ WDIOF_KEEPALIVEPING |
+ WDIOF_MAGICCLOSE,
+ .firmware_version = 0,
+ .identity = "RC32434_WDT Watchdog",
+ };
+ switch (cmd) {
+ default:
+ return -ENOTTY;
+ case WDIOC_GETSUPPORT:
+ if(copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident)))
+ return -EFAULT;
+ return 0;
+ case WDIOC_GETSTATUS:
+ case WDIOC_GETBOOTSTATUS:
+ return put_user(0,(int *)arg);
+ case WDIOC_KEEPALIVE:
+ update_wdt();
+ return 0;
+ case WDIOC_SETTIMEOUT:
+ if (get_user(new_timeout, (int *)arg))
+ return -EFAULT;
+ if (new_timeout < 1)
+ return -EINVAL;
+ if (new_timeout > MAX_TIMEOUT)
+ return -EINVAL;
+ set_wdt(new_timeout);
+ /* Fall */
+ case WDIOC_GETTIMEOUT:
+ return put_user(timeout, (int *)arg);
+ }
+}
+
+static struct file_operations wdt_fops = {
+ owner: THIS_MODULE,
+ llseek: no_llseek,
+ write: wdt_write,
+ ioctl: wdt_ioctl,
+ open: wdt_open,
+ release: wdt_release,
+};
+
+static struct miscdevice wdt_miscdev = {
+ minor: WATCHDOG_MINOR,
+ name: "watchdog",
+ fops: &wdt_fops,
+};
+
+static char banner[] __initdata = KERN_INFO NAME ": Watchdog Timer version " VERSION ", timer margin: %d sec\n";
+
+static int __init watchdog_init(void)
+{
+ int ret;
+
+ /*
+ * There should be check for RC32434 SoC
+ */
+ if (mips_machgroup != MACH_GROUP_MIKROTIK) return -1;
+
+ ret = misc_register(&wdt_miscdev);
+
+ if (ret)
+ return ret;
+
+ stop_wdt();
+ set_wdt(DEFAULT_TIMEOUT);
+
+ printk(banner, timeout);
+
+ return 0;
+}
+
+static void __exit watchdog_exit(void)
+{
+ misc_deregister(&wdt_miscdev);
+}
+
+module_init(watchdog_init);
+module_exit(watchdog_exit);
diff --git a/target/linux/rb532/files/include/asm-mips/rc32434/integ.h b/target/linux/rb532/files/include/asm-mips/rc32434/integ.h
new file mode 100644
index 0000000000..a9e99e4be7
--- /dev/null
+++ b/target/linux/rb532/files/include/asm-mips/rc32434/integ.h
@@ -0,0 +1,76 @@
+#ifndef __IDT_INTEG_H__
+#define __IDT_INTEG_H__
+
+/*******************************************************************************
+ *
+ * Copyright 2002 Integrated Device Technology, Inc.
+ * All rights reserved.
+ *
+ * System Integrity register definition.
+ *
+ * File : $Id: integ.h,v 1.3 2002/06/06 18:34:04 astichte Exp $
+ *
+ * Author : ryan.holmQVist@idt.com
+ * Date : 20011005
+ * Update :
+ * $Log: integ.h,v $
+ * Revision 1.3 2002/06/06 18:34:04 astichte
+ * Added XXX_PhysicalAddress and XXX_VirtualAddress
+ *
+ * Revision 1.2 2002/06/05 18:32:33 astichte
+ * Removed IDTField
+ *
+ * Revision 1.1 2002/05/29 17:33:22 sysarch
+ * jba File moved from vcode/include/idt/acacia
+ *
+ ******************************************************************************/
+
+enum
+{
+ INTEG0_PhysicalAddress = 0x18030000,
+ INTEG_PhysicalAddress = INTEG0_PhysicalAddress, // Default
+
+ INTEG0_VirtualAddress = 0xb8030000,
+ INTEG_VirtualAddress = INTEG0_VirtualAddress, // Default
+} ;
+
+// if you are looing for CEA, try rst.h
+typedef struct
+{
+ u32 filler [0xc] ; // 0x30 bytes unused.
+ u32 errcs ; // sticky use ERRCS_
+ u32 wtcount ; // Watchdog timer count reg.
+ u32 wtcompare ; // Watchdog timer timeout value.
+ u32 wtc ; // Watchdog timer control. use WTC_
+} volatile *INTEG_t ;
+
+enum
+{
+ ERRCS_wto_b = 0, // In INTEG_t -> errcs
+ ERRCS_wto_m = 0x00000001,
+ ERRCS_wne_b = 1, // In INTEG_t -> errcs
+ ERRCS_wne_m = 0x00000002,
+ ERRCS_ucw_b = 2, // In INTEG_t -> errcs
+ ERRCS_ucw_m = 0x00000004,
+ ERRCS_ucr_b = 3, // In INTEG_t -> errcs
+ ERRCS_ucr_m = 0x00000008,
+ ERRCS_upw_b = 4, // In INTEG_t -> errcs
+ ERRCS_upw_m = 0x00000010,
+ ERRCS_upr_b = 5, // In INTEG_t -> errcs
+ ERRCS_upr_m = 0x00000020,
+ ERRCS_udw_b = 6, // In INTEG_t -> errcs
+ ERRCS_udw_m = 0x00000040,
+ ERRCS_udr_b = 7, // In INTEG_t -> errcs
+ ERRCS_udr_m = 0x00000080,
+ ERRCS_sae_b = 8, // In INTEG_t -> errcs
+ ERRCS_sae_m = 0x00000100,
+ ERRCS_wre_b = 9, // In INTEG_t -> errcs
+ ERRCS_wre_m = 0x00000200,
+
+ WTC_en_b = 0, // In INTEG_t -> wtc
+ WTC_en_m = 0x00000001,
+ WTC_to_b = 1, // In INTEG_t -> wtc
+ WTC_to_m = 0x00000002,
+} ;
+
+#endif // __IDT_INTEG_H__
diff --git a/target/linux/rb532/patches/520-rc32434_wdt.patch b/target/linux/rb532/patches/520-rc32434_wdt.patch
new file mode 100644
index 0000000000..7864d1536b
--- /dev/null
+++ b/target/linux/rb532/patches/520-rc32434_wdt.patch
@@ -0,0 +1,43 @@
+diff -ur linux-2.6.22.4.old/arch/mips/kernel/time.c linux-2.6.22.4.new/arch/mips/kernel/time.c
+--- linux-2.6.22.4.old/arch/mips/kernel/time.c 2007-08-21 06:33:06.000000000 +0200
++++ linux-2.6.22.4.new/arch/mips/kernel/time.c 2007-12-24 17:13:43.000000000 +0100
+@@ -478,3 +478,5 @@
+ EXPORT_SYMBOL(to_tm);
+ EXPORT_SYMBOL(rtc_mips_set_time);
+ EXPORT_SYMBOL(rtc_mips_get_time);
++EXPORT_SYMBOL(mips_hpt_frequency);
++
+diff -ur linux-2.6.22.4.old/drivers/char/watchdog/Kconfig linux-2.6.22.4.new/drivers/char/watchdog/Kconfig
+--- linux-2.6.22.4.old/drivers/char/watchdog/Kconfig 2007-08-21 06:33:06.000000000 +0200
++++ linux-2.6.22.4.new/drivers/char/watchdog/Kconfig 2007-12-24 17:13:43.000000000 +0100
+@@ -575,6 +575,19 @@
+ To compile this driver as a module, choose M here: the
+ module will be called rm9k_wdt.
+
++config RC32434_WDT
++ tristate "IDT Interprise 79RC32434 SoC hardware watchdog"
++ depends on WATCHDOG && MIKROTIK_RB500
++ help
++ This is a driver for hardware watchdog integrated in IDT Interprise
++ 79RC32434 SoC. This watchdog simply watches your kernel to make sure
++ it doesn't freeze, and if it does, it reboots your computer after a
++ certain amount of time.
++
++ To compile this driver as a module, choose M here: the module will be
++ called rc32434_wdt.
++
++
+ # S390 Architecture
+
+ config ZVM_WATCHDOG
+diff -ur linux-2.6.22.4.old/drivers/char/watchdog/Makefile linux-2.6.22.4.new/drivers/char/watchdog/Makefile
+--- linux-2.6.22.4.old/drivers/char/watchdog/Makefile 2007-08-21 06:33:06.000000000 +0200
++++ linux-2.6.22.4.new/drivers/char/watchdog/Makefile 2007-12-24 17:13:43.000000000 +0100
+@@ -75,6 +75,7 @@
+ obj-$(CONFIG_INDYDOG) += indydog.o
+ obj-$(CONFIG_WDT_MTX1) += mtx-1_wdt.o
+ obj-$(CONFIG_WDT_RM9K_GPI) += rm9k_wdt.o
++obj-$(CONFIG_RC32434_WDT) += rc32434_wdt.o
+
+ # S390 Architecture
+