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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Intel Merrifield watchdog platform device library file4 *5 * (C) Copyright 2014 Intel Corporation6 * 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 13#include <asm/cpu_device_id.h>14#include <asm/intel-family.h>15#include <asm/io_apic.h>16#include <asm/hw_irq.h>17 18#include <linux/platform_data/x86/intel-mid_wdt.h>19 20#define TANGIER_EXT_TIMER0_MSI 1221 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_VFM(INTEL_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);76