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75 lines
1.7 KiB
75 lines
1.7 KiB
// 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 <[email protected]> |
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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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