openwrt-xburst/target/linux/lantiq/patches-3.2/0057-MIPS-lantiq-falcon-VPE-softdog.patch

From 7ee92edb5569c1cdc676a2635a40b53e8d9d647d Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Thu, 29 Sep 2011 21:29:14 +0200
Subject: [PATCH 57/73] MIPS: lantiq: falcon VPE softdog

---
 arch/mips/include/asm/mach-lantiq/falcon/vpe.h |   44 ++++++++++
 arch/mips/lantiq/falcon/softdog_vpe.c          |  109 ++++++++++++++++++++++++
 2 files changed, 153 insertions(+), 0 deletions(-)
 create mode 100644 arch/mips/include/asm/mach-lantiq/falcon/vpe.h
 create mode 100644 arch/mips/lantiq/falcon/softdog_vpe.c

--- /dev/null
+++ b/arch/mips/include/asm/mach-lantiq/falcon/vpe.h
@@ -0,0 +1,44 @@
+/*
+ *   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.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
+ *
+ *   Copyright (C) 2005 infineon
+ *   Copyright (C) 2007 John Crispin <blogic@openwrt.org>
+ *
+ */
+#ifndef _IFXMIPS_VPE_H__
+#define _IFXMIPS_VPE_H__
+
+/* For the explanation of the APIs please refer the section "MT APRP Kernel
+ * Programming" in AR9 SW Architecture Specification
+ */
+int32_t vpe1_sw_start(void* sw_start_addr, uint32_t tcmask, uint32_t flags);
+int32_t vpe1_sw_stop(uint32_t flags);
+uint32_t vpe1_get_load_addr (uint32_t flags);
+uint32_t vpe1_get_max_mem (uint32_t flags);
+
+int32_t vpe1_set_boot_param(char *field, char *value, char flags);
+int32_t vpe1_get_boot_param(char *field, char **value, char flags);
+
+/* Watchdog APIs */
+extern unsigned long vpe1_wdog_ctr;
+extern unsigned long vpe1_wdog_timeout;
+
+unsigned long vpe1_sw_wdog_start(unsigned long);
+unsigned long vpe1_sw_wdog_stop(unsigned long);
+
+typedef int (*VPE_SW_WDOG_RESET)(unsigned long wdog_cleared_ok_count);
+int32_t vpe1_sw_wdog_register_reset_handler(VPE_SW_WDOG_RESET reset_fn);
+
+#endif
--- /dev/null
+++ b/arch/mips/lantiq/falcon/softdog_vpe.c
@@ -0,0 +1,109 @@
+/*
+** =============================================================================
+** FILE NAME     : softdog_vpe.c
+** MODULES       : LXDB
+** DATE          : 24-03-2008
+** AUTHOR        : LXDB Team
+** DESCRIPTION   : This header file contains the code for the watchdog
+**                 implentation on vpe1 side.
+** REFERENCES    :
+** COPYRIGHT     : Copyright (c) 2008
+**                 Am Campeon 1-12, 85579 Neubiberg, Germany
+** Any use of this software is subject to the conclusion of a respective
+** License agreement. Without such a License agreement no rights to the
+** software are granted
+**
+** HISTORY       :
+** $Date   $Author    $Comment
+** 24-03-2008   LXDB    Initial version
+** ============================================================================
+*/
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/timer.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <linux/jiffies.h>
+
+#include <falcon/vpe.h>
+
+static unsigned long last_wdog_value;
+static unsigned long vpe1_wdog_cleared;
+
+static unsigned long vpe1_wdog_dead;
+static void watchdog_vpe0_fire(unsigned long); /* Called when vpe0 timer expires */
+static void keep_alive_vpe0(unsigned long);
+VPE_SW_WDOG_RESET reset_local_fn;
+
+
+static struct timer_list watchdog_vpe0_ticktock =
+                TIMER_INITIALIZER(watchdog_vpe0_fire, 0, 0);
+
+static void watchdog_vpe0_fire (unsigned long flags)
+{
+	volatile unsigned long *wdog_ctr_value;
+	wdog_ctr_value = (void*)vpe1_wdog_ctr;
+	if (*wdog_ctr_value == last_wdog_value) { /* VPE1 watchdog expiry handling */
+		vpe1_sw_wdog_stop(flags);
+		vpe1_wdog_dead++;
+		printk(KERN_DEBUG "VPE1 watchdog reset handler called\n");
+	/* Call the reset handler function */
+		reset_local_fn(flags);
+	} else { /* Everything is OK on vpe1 side. Continue. */
+		last_wdog_value = *wdog_ctr_value;
+		vpe1_wdog_cleared++;
+		keep_alive_vpe0(flags);
+	}
+}
+
+int32_t vpe1_sw_wdog_register_reset_handler (VPE_SW_WDOG_RESET reset_fn)
+{
+	reset_local_fn = (VPE_SW_WDOG_RESET)reset_fn;
+	return 0;
+}
+
+static void keep_alive_vpe0(unsigned long flags)
+{
+	mod_timer(&watchdog_vpe0_ticktock, jiffies+ vpe1_wdog_timeout );
+}
+
+unsigned long vpe1_sw_wdog_start(unsigned long flags)
+{
+	volatile unsigned long *wdog_ctr_value;
+	wdog_ctr_value = (void*)vpe1_wdog_ctr;
+	*wdog_ctr_value = 0;
+	last_wdog_value = 0;
+	keep_alive_vpe0(flags);
+	return 0;
+}
+
+unsigned long vpe1_sw_wdog_stop(unsigned long flags)
+{
+	del_timer(&watchdog_vpe0_ticktock);
+	return 0;
+}
+
+static int __init watchdog_vpe1_init(void)
+{
+	/* Nothing to be done here */
+	return 0;
+}
+
+static void __exit watchdog_vpe1_exit(void)
+{
+	unsigned long flags=0;
+	vpe1_sw_wdog_stop(flags);
+}
+
+module_init(watchdog_vpe1_init);
+module_exit(watchdog_vpe1_exit);
+
+EXPORT_SYMBOL(vpe1_sw_wdog_register_reset_handler);
+EXPORT_SYMBOL(vpe1_sw_wdog_start);
+EXPORT_SYMBOL(vpe1_sw_wdog_stop);
+
+MODULE_AUTHOR("LXDB");
+MODULE_DESCRIPTION("Software Watchdog For VPE1");
+MODULE_LICENSE("GPL");