projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 78a3bb9e | 1 | /* |
| e5dce286 | 2 | * Intel Merrifield watchdog platform device library file |
| 78a3bb9e DC |
3 | * |
| 4 | * (C) Copyright 2014 Intel Corporation | |
| 5 | * Author: David Cohen <david.a.cohen@linux.intel.com> | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or | |
| 8 | * modify it under the terms of the GNU General Public License | |
| 9 | * as published by the Free Software Foundation; version 2 | |
| 10 | * of the License. | |
| 11 | */ | |
| 12 | ||
| 13 | #include <linux/init.h> | |
| 14 | #include <linux/interrupt.h> | |
| 15 | #include <linux/platform_device.h> | |
| 16 | #include <linux/platform_data/intel-mid_wdt.h> | |
| 8c5c86fb | 17 | |
| 78a3bb9e | 18 | #include <asm/intel-mid.h> |
| 8c5c86fb | 19 | #include <asm/intel_scu_ipc.h> |
| 78a3bb9e DC |
20 | #include <asm/io_apic.h> |
| 21 | ||
| 80354c29 | 22 | #define TANGIER_EXT_TIMER0_MSI 12 |
| 78a3bb9e DC |
23 | |
| 24 | static struct platform_device wdt_dev = { | |
| 25 | .name = "intel_mid_wdt", | |
| 26 | .id = -1, | |
| 27 | }; | |
| 28 | ||
| 29 | static int tangier_probe(struct platform_device *pdev) | |
| 30 | { | |
| c4d05a2c | 31 | struct irq_alloc_info info; |
| 78a3bb9e | 32 | struct intel_mid_wdt_pdata *pdata = pdev->dev.platform_data; |
| 93953395 | 33 | int gsi, irq; |
| 78a3bb9e DC |
34 | |
| 35 | if (!pdata) | |
| 36 | return -EINVAL; | |
| 37 | ||
| a4355e67 JL |
38 | /* IOAPIC builds identity mapping between GSI and IRQ on MID */ |
| 39 | gsi = pdata->irq; | |
| c4d05a2c | 40 | ioapic_set_alloc_attr(&info, cpu_to_node(0), 1, 0); |
| 93953395 AS |
41 | irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info); |
| 42 | if (irq < 0) { | |
| 43 | dev_warn(&pdev->dev, "cannot find interrupt %d in ioapic\n", gsi); | |
| 44 | return irq; | |
| 78a3bb9e DC |
45 | } |
| 46 | ||
| 47 | return 0; | |
| 48 | } | |
| 49 | ||
| 50 | static struct intel_mid_wdt_pdata tangier_pdata = { | |
| 51 | .irq = TANGIER_EXT_TIMER0_MSI, | |
| 52 | .probe = tangier_probe, | |
| 53 | }; | |
| 54 | ||
| 8c5c86fb AS |
55 | static int wdt_scu_status_change(struct notifier_block *nb, |
| 56 | unsigned long code, void *data) | |
| 78a3bb9e | 57 | { |
| 8c5c86fb AS |
58 | if (code == SCU_DOWN) { |
| 59 | platform_device_unregister(&wdt_dev); | |
| 60 | return 0; | |
| 78a3bb9e DC |
61 | } |
| 62 | ||
| 8c5c86fb | 63 | return platform_device_register(&wdt_dev); |
| 78a3bb9e DC |
64 | } |
| 65 | ||
| 8c5c86fb AS |
66 | static struct notifier_block wdt_scu_notifier = { |
| 67 | .notifier_call = wdt_scu_status_change, | |
| 68 | }; | |
| 69 | ||
| 70 | static int __init register_mid_wdt(void) | |
| 71 | { | |
| 72 | if (intel_mid_identify_cpu() != INTEL_MID_CPU_CHIP_TANGIER) | |
| 73 | return -ENODEV; | |
| 74 | ||
| 75 | wdt_dev.dev.platform_data = &tangier_pdata; | |
| 76 | ||
| 77 | /* | |
| 78 | * We need to be sure that the SCU IPC is ready before watchdog device | |
| 79 | * can be registered: | |
| 80 | */ | |
| 81 | intel_scu_notifier_add(&wdt_scu_notifier); | |
| 82 | ||
| 83 | return 0; | |
| 84 | } | |
| e2e2eabb | 85 | arch_initcall(register_mid_wdt); |