| /* |
| * 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 gsi; |
| struct irq_alloc_info info; |
| struct intel_mid_wdt_pdata *pdata = pdev->dev.platform_data; |
| |
| if (!pdata) |
| return -EINVAL; |
| |
| /* IOAPIC builds identity mapping between GSI and IRQ on MID */ |
| gsi = pdata->irq; |
| ioapic_set_alloc_attr(&info, cpu_to_node(0), 1, 0); |
| if (mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info) <= 0) { |
| dev_warn(&pdev->dev, "cannot find interrupt %d in ioapic\n", |
| gsi); |
| 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); |
