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