57539c1cf9
This submission includes:
- Fix to intel_scu_write() to start watchdog timer the on the
first write, and refresh on subsequent writes.
This enables Open, write, write, ... usage model.
- Moves boot parameter checks from intel_scu_open() to
intel_scu_watchdog_init(), so driver init will fail if these
parameters are out of bounds.
- Adds check for whether process waiting in wait_event_interruptible()
received a signal while it was waiting.
- Other small error handling changes.
Removed the read() method for now as that wass a non-standard behaviour.
Signed-off-by: Donald Johnson <donald.k.johnson@intel.com>
Signed-off-by: Shuduo Sang <shuduo.sang@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
67 lines
2.0 KiB
C
67 lines
2.0 KiB
C
/*
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* Intel_SCU 0.2: An Intel SCU IOH Based Watchdog Device
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* for Intel part #(s):
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* - AF82MP20 PCH
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*
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* Copyright (C) 2009-2010 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General
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* Public License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the Free
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* Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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* The full GNU General Public License is included in this
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* distribution in the file called COPYING.
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*
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*/
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#ifndef __INTEL_SCU_WATCHDOG_H
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#define __INTEL_SCU_WATCHDOG_H
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#define PFX "Intel_SCU: "
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#define WDT_VER "0.3"
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/* minimum time between interrupts */
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#define MIN_TIME_CYCLE 1
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/* Time from warning to reboot is 2 seconds */
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#define DEFAULT_SOFT_TO_HARD_MARGIN 2
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#define MAX_TIME 170
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#define DEFAULT_TIME 5
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#define MAX_SOFT_TO_HARD_MARGIN (MAX_TIME-MIN_TIME_CYCLE)
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/* Ajustment to clock tick frequency to make timing come out right */
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#define FREQ_ADJUSTMENT 8
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struct intel_scu_watchdog_dev {
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ulong driver_open;
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ulong driver_closed;
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u32 timer_started;
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u32 timer_set;
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u32 threshold;
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u32 soft_threshold;
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u32 __iomem *timer_load_count_addr;
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u32 __iomem *timer_current_value_addr;
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u32 __iomem *timer_control_addr;
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u32 __iomem *timer_clear_interrupt_addr;
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u32 __iomem *timer_interrupt_status_addr;
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struct sfi_timer_table_entry *timer_tbl_ptr;
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struct notifier_block intel_scu_notifier;
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struct miscdevice miscdev;
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};
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extern int sfi_mtimer_num;
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/* extern struct sfi_timer_table_entry *sfi_get_mtmr(int hint); */
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#endif /* __INTEL_SCU_WATCHDOG_H */
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