cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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intel_scu_wdt.c (1761B)

      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);