1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Intel Merrifield watchdog platform device library file
 4 *
 5 * (C) Copyright 2014 Intel Corporation
 6 * Author: David Cohen <david.a.cohen@linux.intel.com>
 7 */
 8
 9#include <linux/init.h>
10#include <linux/interrupt.h>
11#include <linux/platform_device.h>
12#include <linux/platform_data/intel-mid_wdt.h>
13
14#include <asm/cpu_device_id.h>
15#include <asm/intel-family.h>
16#include <asm/intel-mid.h>
17#include <asm/io_apic.h>
18#include <asm/hw_irq.h>
19
20#define TANGIER_EXT_TIMER0_MSI 12
21
22static struct platform_device wdt_dev = {
23	.name = "intel_mid_wdt",
24	.id = -1,
25};
26
27static int tangier_probe(struct platform_device *pdev)
28{
29	struct irq_alloc_info info;
30	struct intel_mid_wdt_pdata *pdata = pdev->dev.platform_data;
31	int gsi = TANGIER_EXT_TIMER0_MSI;
32	int irq;
33
34	if (!pdata)
35		return -EINVAL;
36
37	/* IOAPIC builds identity mapping between GSI and IRQ on MID */
38	ioapic_set_alloc_attr(&info, cpu_to_node(0), 1, 0);
39	irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
40	if (irq < 0) {
41		dev_warn(&pdev->dev, "cannot find interrupt %d in ioapic\n", gsi);
42		return irq;
43	}
44
45	pdata->irq = irq;
46	return 0;
47}
48
49static struct intel_mid_wdt_pdata tangier_pdata = {
50	.probe = tangier_probe,
51};
52
53static const struct x86_cpu_id intel_mid_cpu_ids[] = {
54	X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT_MID, &tangier_pdata),
55	{}
56};
57
58static int __init register_mid_wdt(void)
59{
60	const struct x86_cpu_id *id;
61
62	id = x86_match_cpu(intel_mid_cpu_ids);
63	if (!id)
64		return -ENODEV;
65
66	wdt_dev.dev.platform_data = (struct intel_mid_wdt_pdata *)id->driver_data;
67	return platform_device_register(&wdt_dev);
68}
69arch_initcall(register_mid_wdt);
70
71static void __exit unregister_mid_wdt(void)
72{
73	platform_device_unregister(&wdt_dev);
74}
75__exitcall(unregister_mid_wdt);