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/*
* platform_wdt.c: Watchdog platform library file
*
* (C) Copyright 2014 Intel Corporation
* Author: David Cohen <david.a.cohen@linux.intel.com>
*
* 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; version 2
* of the License.
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/platform_data/intel-mid_wdt.h>
#include <asm/intel-mid.h>
#include <asm/io_apic.h>
#define TANGIER_EXT_TIMER0_MSI 15
static struct platform_device wdt_dev = {
.name = "intel_mid_wdt",
.id = -1,
};
static int tangier_probe(struct platform_device *pdev)
{
int ioapic;
int irq;
struct intel_mid_wdt_pdata *pdata = pdev->dev.platform_data;
struct io_apic_irq_attr irq_attr = { 0 };
if (!pdata)
return -EINVAL;
irq = pdata->irq;
ioapic = mp_find_ioapic(irq);
if (ioapic >= 0) {
int ret;
irq_attr.ioapic = ioapic;
irq_attr.ioapic_pin = irq;
irq_attr.trigger = 1;
/* irq_attr.polarity = 0; -> Active high */
ret = io_apic_set_pci_routing(NULL, irq, &irq_attr);
if (ret)
return ret;
} else {
dev_warn(&pdev->dev, "cannot find interrupt %d in ioapic\n",
irq);
return -EINVAL;
}
return 0;
}
static struct intel_mid_wdt_pdata tangier_pdata = {
.irq = TANGIER_EXT_TIMER0_MSI,
.probe = tangier_probe,
};
static int __init register_mid_wdt(void)
{
if (intel_mid_identify_cpu() == INTEL_MID_CPU_CHIP_TANGIER) {
wdt_dev.dev.platform_data = &tangier_pdata;
return platform_device_register(&wdt_dev);
}
return -ENODEV;
}
rootfs_initcall(register_mid_wdt);
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