1/*
2 * platform_wdt.c: Watchdog platform library file
3 *
4 * (C) Copyright 2014 Intel Corporation
5 * Author: David Cohen <david.a.cohen@linux.intel.com>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; version 2
10 * of the License.
11 */
12
13#include <linux/init.h>
14#include <linux/interrupt.h>
15#include <linux/platform_device.h>
16#include <linux/platform_data/intel-mid_wdt.h>
17#include <asm/intel-mid.h>
18#include <asm/io_apic.h>
19
20#define TANGIER_EXT_TIMER0_MSI 15
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	int gsi;
30	struct intel_mid_wdt_pdata *pdata = pdev->dev.platform_data;
31
32	if (!pdata)
33		return -EINVAL;
34
35	/* IOAPIC builds identity mapping between GSI and IRQ on MID */
36	gsi = pdata->irq;
37	if (mp_set_gsi_attr(gsi, 1, 0, cpu_to_node(0)) ||
38	    mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC) <= 0) {
39		dev_warn(&pdev->dev, "cannot find interrupt %d in ioapic\n",
40			 gsi);
41		return -EINVAL;
42	}
43
44	return 0;
45}
46
47static struct intel_mid_wdt_pdata tangier_pdata = {
48	.irq = TANGIER_EXT_TIMER0_MSI,
49	.probe = tangier_probe,
50};
51
52static int __init register_mid_wdt(void)
53{
54	if (intel_mid_identify_cpu() == INTEL_MID_CPU_CHIP_TANGIER) {
55		wdt_dev.dev.platform_data = &tangier_pdata;
56		return platform_device_register(&wdt_dev);
57	}
58
59	return -ENODEV;
60}
61
62rootfs_initcall(register_mid_wdt);
63