| /* |
| * platform_wdt.c: Watchdog platform library file |
| * |
| * (C) Copyright 2014 Intel Corporation |
| * Author: David Cohen <david.a.cohen@linux.intel.com> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; version 2 |
| * of the License. |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/interrupt.h> |
| #include <linux/platform_device.h> |
| #include <linux/platform_data/intel-mid_wdt.h> |
| #include <asm/intel-mid.h> |
| #include <asm/io_apic.h> |
| |
| #define TANGIER_EXT_TIMER0_MSI 15 |
| |
| static struct platform_device wdt_dev = { |
| .name = "intel_mid_wdt", |
| .id = -1, |
| }; |
| |
| static int tangier_probe(struct platform_device *pdev) |
| { |
| int ioapic; |
| int irq; |
| struct intel_mid_wdt_pdata *pdata = pdev->dev.platform_data; |
| struct io_apic_irq_attr irq_attr = { 0 }; |
| |
| if (!pdata) |
| return -EINVAL; |
| |
| irq = pdata->irq; |
| ioapic = mp_find_ioapic(irq); |
| if (ioapic >= 0) { |
| int ret; |
| irq_attr.ioapic = ioapic; |
| irq_attr.ioapic_pin = irq; |
| irq_attr.trigger = 1; |
| /* irq_attr.polarity = 0; -> Active high */ |
| ret = io_apic_set_pci_routing(NULL, irq, &irq_attr); |
| if (ret) |
| return ret; |
| } else { |
| dev_warn(&pdev->dev, "cannot find interrupt %d in ioapic\n", |
| irq); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static struct intel_mid_wdt_pdata tangier_pdata = { |
| .irq = TANGIER_EXT_TIMER0_MSI, |
| .probe = tangier_probe, |
| }; |
| |
| static int __init register_mid_wdt(void) |
| { |
| if (intel_mid_identify_cpu() == INTEL_MID_CPU_CHIP_TANGIER) { |
| wdt_dev.dev.platform_data = &tangier_pdata; |
| return platform_device_register(&wdt_dev); |
| } |
| |
| return -ENODEV; |
| } |
| |
| rootfs_initcall(register_mid_wdt); |
