1 /*
2 * Copyright (C) 2009 Thomas Gleixner <tglx@linutronix.de>
3 *
4 * For licencing details see kernel-base/COPYING
5 */
6 #include <linux/init.h>
7 #include <linux/ioport.h>
8 #include <linux/export.h>
9 #include <linux/pci.h>
10
11 #include <asm/acpi.h>
12 #include <asm/bios_ebda.h>
13 #include <asm/paravirt.h>
14 #include <asm/pci_x86.h>
15 #include <asm/mpspec.h>
16 #include <asm/setup.h>
17 #include <asm/apic.h>
18 #include <asm/e820/api.h>
19 #include <asm/time.h>
20 #include <asm/irq.h>
21 #include <asm/io_apic.h>
22 #include <asm/hpet.h>
23 #include <asm/memtype.h>
24 #include <asm/tsc.h>
25 #include <asm/iommu.h>
26 #include <asm/mach_traps.h>
27 #include <asm/irqdomain.h>
28
x86_init_noop(void)29 void x86_init_noop(void) { }
x86_init_uint_noop(unsigned int unused)30 void __init x86_init_uint_noop(unsigned int unused) { }
iommu_init_noop(void)31 static int __init iommu_init_noop(void) { return 0; }
iommu_shutdown_noop(void)32 static void iommu_shutdown_noop(void) { }
bool_x86_init_noop(void)33 bool __init bool_x86_init_noop(void) { return false; }
x86_op_int_noop(int cpu)34 void x86_op_int_noop(int cpu) { }
set_rtc_noop(const struct timespec64 * now)35 static __init int set_rtc_noop(const struct timespec64 *now) { return -EINVAL; }
get_rtc_noop(struct timespec64 * now)36 static __init void get_rtc_noop(struct timespec64 *now) { }
37
38 static __initconst const struct of_device_id of_cmos_match[] = {
39 { .compatible = "motorola,mc146818" },
40 {}
41 };
42
43 /*
44 * Allow devicetree configured systems to disable the RTC by setting the
45 * corresponding DT node's status property to disabled. Code is optimized
46 * out for CONFIG_OF=n builds.
47 */
x86_wallclock_init(void)48 static __init void x86_wallclock_init(void)
49 {
50 struct device_node *node = of_find_matching_node(NULL, of_cmos_match);
51
52 if (node && !of_device_is_available(node)) {
53 x86_platform.get_wallclock = get_rtc_noop;
54 x86_platform.set_wallclock = set_rtc_noop;
55 }
56 }
57
58 /*
59 * The platform setup functions are preset with the default functions
60 * for standard PC hardware.
61 */
62 struct x86_init_ops x86_init __initdata = {
63
64 .resources = {
65 .probe_roms = probe_roms,
66 .reserve_resources = reserve_standard_io_resources,
67 .memory_setup = e820__memory_setup_default,
68 },
69
70 .mpparse = {
71 .setup_ioapic_ids = x86_init_noop,
72 .find_smp_config = default_find_smp_config,
73 .get_smp_config = default_get_smp_config,
74 },
75
76 .irqs = {
77 .pre_vector_init = init_ISA_irqs,
78 .intr_init = native_init_IRQ,
79 .intr_mode_select = apic_intr_mode_select,
80 .intr_mode_init = apic_intr_mode_init,
81 .create_pci_msi_domain = native_create_pci_msi_domain,
82 },
83
84 .oem = {
85 .arch_setup = x86_init_noop,
86 .banner = default_banner,
87 },
88
89 .paging = {
90 .pagetable_init = native_pagetable_init,
91 },
92
93 .timers = {
94 .setup_percpu_clockev = setup_boot_APIC_clock,
95 .timer_init = hpet_time_init,
96 .wallclock_init = x86_wallclock_init,
97 },
98
99 .iommu = {
100 .iommu_init = iommu_init_noop,
101 },
102
103 .pci = {
104 .init = x86_default_pci_init,
105 .init_irq = x86_default_pci_init_irq,
106 .fixup_irqs = x86_default_pci_fixup_irqs,
107 },
108
109 .hyper = {
110 .init_platform = x86_init_noop,
111 .guest_late_init = x86_init_noop,
112 .x2apic_available = bool_x86_init_noop,
113 .init_mem_mapping = x86_init_noop,
114 .init_after_bootmem = x86_init_noop,
115 },
116
117 .acpi = {
118 .set_root_pointer = x86_default_set_root_pointer,
119 .get_root_pointer = x86_default_get_root_pointer,
120 .reduced_hw_early_init = acpi_generic_reduced_hw_init,
121 },
122 };
123
124 struct x86_cpuinit_ops x86_cpuinit = {
125 .early_percpu_clock_init = x86_init_noop,
126 .setup_percpu_clockev = setup_secondary_APIC_clock,
127 };
128
default_nmi_init(void)129 static void default_nmi_init(void) { };
130
131 struct x86_platform_ops x86_platform __ro_after_init = {
132 .calibrate_cpu = native_calibrate_cpu_early,
133 .calibrate_tsc = native_calibrate_tsc,
134 .get_wallclock = mach_get_cmos_time,
135 .set_wallclock = mach_set_rtc_mmss,
136 .iommu_shutdown = iommu_shutdown_noop,
137 .is_untracked_pat_range = is_ISA_range,
138 .nmi_init = default_nmi_init,
139 .get_nmi_reason = default_get_nmi_reason,
140 .save_sched_clock_state = tsc_save_sched_clock_state,
141 .restore_sched_clock_state = tsc_restore_sched_clock_state,
142 .hyper.pin_vcpu = x86_op_int_noop,
143 };
144
145 EXPORT_SYMBOL_GPL(x86_platform);
146
147 #if defined(CONFIG_PCI_MSI)
148 struct x86_msi_ops x86_msi __ro_after_init = {
149 .restore_msi_irqs = default_restore_msi_irqs,
150 };
151
152 /* MSI arch specific hooks */
arch_restore_msi_irqs(struct pci_dev * dev)153 void arch_restore_msi_irqs(struct pci_dev *dev)
154 {
155 x86_msi.restore_msi_irqs(dev);
156 }
157 #endif
158
159 struct x86_apic_ops x86_apic_ops __ro_after_init = {
160 .io_apic_read = native_io_apic_read,
161 .restore = native_restore_boot_irq_mode,
162 };
163
