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// SPDX-License-Identifier: GPL-2.0-only
/*
* Intel Merrifield watchdog platform device library file
*
* (C) Copyright 2014 Intel Corporation
* Author: David Cohen <david.a.cohen@linux.intel.com>
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/platform_data/intel-mid_wdt.h>
#include <asm/cpu_device_id.h>
#include <asm/intel-family.h>
#include <asm/io_apic.h>
#include <asm/hw_irq.h>
#define TANGIER_EXT_TIMER0_MSI 12
static struct platform_device wdt_dev = {
.name = "intel_mid_wdt",
.id = -1,
};
static int tangier_probe(struct platform_device *pdev)
{
struct irq_alloc_info info;
struct intel_mid_wdt_pdata *pdata = pdev->dev.platform_data;
int gsi = TANGIER_EXT_TIMER0_MSI;
int irq;
if (!pdata)
return -EINVAL;
/* IOAPIC builds identity mapping between GSI and IRQ on MID */
ioapic_set_alloc_attr(&info, cpu_to_node(0), 1, 0);
irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
if (irq < 0) {
dev_warn(&pdev->dev, "cannot find interrupt %d in ioapic\n", gsi);
return irq;
}
pdata->irq = irq;
return 0;
}
static struct intel_mid_wdt_pdata tangier_pdata = {
.probe = tangier_probe,
};
static const struct x86_cpu_id intel_mid_cpu_ids[] = {
X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT_MID, &tangier_pdata),
{}
};
static int __init register_mid_wdt(void)
{
const struct x86_cpu_id *id;
id = x86_match_cpu(intel_mid_cpu_ids);
if (!id)
return -ENODEV;
wdt_dev.dev.platform_data = (struct intel_mid_wdt_pdata *)id->driver_data;
return platform_device_register(&wdt_dev);
}
arch_initcall(register_mid_wdt);
static void __exit unregister_mid_wdt(void)
{
platform_device_unregister(&wdt_dev);
}
__exitcall(unregister_mid_wdt);
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