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/io_apic.h> 17 #include <asm/hw_irq.h> 18 19 #define TANGIER_EXT_TIMER0_MSI 12 20 21 static struct platform_device wdt_dev = { 22 .name = "intel_mid_wdt", 23 .id = -1, 24 }; 25 26 static int tangier_probe(struct platform_device *pdev) 27 { 28 struct irq_alloc_info info; 29 struct intel_mid_wdt_pdata *pdata = pdev->dev.platform_data; 30 int gsi = TANGIER_EXT_TIMER0_MSI; 31 int irq; 32 33 if (!pdata) 34 return -EINVAL; 35 36 /* IOAPIC builds identity mapping between GSI and IRQ on MID */ 37 ioapic_set_alloc_attr(&info, cpu_to_node(0), 1, 0); 38 irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info); 39 if (irq < 0) { 40 dev_warn(&pdev->dev, "cannot find interrupt %d in ioapic\n", gsi); 41 return irq; 42 } 43 44 pdata->irq = irq; 45 return 0; 46 } 47 48 static struct intel_mid_wdt_pdata tangier_pdata = { 49 .probe = tangier_probe, 50 }; 51 52 static const struct x86_cpu_id intel_mid_cpu_ids[] = { 53 X86_MATCH_VFM(INTEL_ATOM_SILVERMONT_MID, &tangier_pdata), 54 {} 55 }; 56 57 static int __init register_mid_wdt(void) 58 { 59 const struct x86_cpu_id *id; 60 61 id = x86_match_cpu(intel_mid_cpu_ids); 62 if (!id) 63 return -ENODEV; 64 65 wdt_dev.dev.platform_data = (struct intel_mid_wdt_pdata *)id->driver_data; 66 return platform_device_register(&wdt_dev); 67 } 68 arch_initcall(register_mid_wdt); 69 70 static void __exit unregister_mid_wdt(void) 71 { 72 platform_device_unregister(&wdt_dev); 73 } 74 __exitcall(unregister_mid_wdt); 75