projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 37655163 AS |
1 | /* |
| 2 | * ARM64 Specific Low-Level ACPI Boot Support | |
| 3 | * | |
| 4 | * Copyright (C) 2013-2014, Linaro Ltd. | |
| 5 | * Author: Al Stone <al.stone@linaro.org> | |
| 6 | * Author: Graeme Gregory <graeme.gregory@linaro.org> | |
| 7 | * Author: Hanjun Guo <hanjun.guo@linaro.org> | |
| 8 | * Author: Tomasz Nowicki <tomasz.nowicki@linaro.org> | |
| 9 | * Author: Naresh Bhat <naresh.bhat@linaro.org> | |
| 10 | * | |
| 11 | * This program is free software; you can redistribute it and/or modify | |
| 12 | * it under the terms of the GNU General Public License version 2 as | |
| 13 | * published by the Free Software Foundation. | |
| 14 | */ | |
| 15 | ||
| 16 | #define pr_fmt(fmt) "ACPI: " fmt | |
| 17 | ||
| 18 | #include <linux/acpi.h> | |
| 19 | #include <linux/bootmem.h> | |
| 20 | #include <linux/cpumask.h> | |
| 21 | #include <linux/init.h> | |
| 22 | #include <linux/irq.h> | |
| 23 | #include <linux/irqdomain.h> | |
| 24 | #include <linux/memblock.h> | |
| 25 | #include <linux/smp.h> | |
| 26 | ||
| 27 | int acpi_noirq; /* skip ACPI IRQ initialization */ | |
| 28 | int acpi_disabled; | |
| 29 | EXPORT_SYMBOL(acpi_disabled); | |
| 30 | ||
| 31 | int acpi_pci_disabled; /* skip ACPI PCI scan and IRQ initialization */ | |
| 32 | EXPORT_SYMBOL(acpi_pci_disabled); | |
| 33 | ||
| 34 | /* | |
| 35 | * __acpi_map_table() will be called before page_init(), so early_ioremap() | |
| 36 | * or early_memremap() should be called here to for ACPI table mapping. | |
| 37 | */ | |
| 38 | char *__init __acpi_map_table(unsigned long phys, unsigned long size) | |
| 39 | { | |
| 40 | if (!size) | |
| 41 | return NULL; | |
| 42 | ||
| 43 | return early_memremap(phys, size); | |
| 44 | } | |
| 45 | ||
| 46 | void __init __acpi_unmap_table(char *map, unsigned long size) | |
| 47 | { | |
| 48 | if (!map || !size) | |
| 49 | return; | |
| 50 | ||
| 51 | early_memunmap(map, size); | |
| 52 | } | |
| 53 | ||
| 54 | static int __init acpi_parse_fadt(struct acpi_table_header *table) | |
| 55 | { | |
| 56 | struct acpi_table_fadt *fadt = (struct acpi_table_fadt *)table; | |
| 57 | ||
| 58 | /* | |
| 59 | * Revision in table header is the FADT Major revision, and there | |
| 60 | * is a minor revision of FADT which was introduced by ACPI 5.1, | |
| 61 | * we only deal with ACPI 5.1 or newer revision to get GIC and SMP | |
| 62 | * boot protocol configuration data, or we will disable ACPI. | |
| 63 | */ | |
| 64 | if (table->revision > 5 || | |
| 65 | (table->revision == 5 && fadt->minor_revision >= 1)) | |
| 66 | return 0; | |
| 67 | ||
| 68 | pr_warn("Unsupported FADT revision %d.%d, should be 5.1+, will disable ACPI\n", | |
| 69 | table->revision, fadt->minor_revision); | |
| 70 | disable_acpi(); | |
| 71 | ||
| 72 | return -EINVAL; | |
| 73 | } | |
| 74 | ||
| 75 | /* | |
| 76 | * acpi_boot_table_init() called from setup_arch(), always. | |
| 77 | * 1. find RSDP and get its address, and then find XSDT | |
| 78 | * 2. extract all tables and checksums them all | |
| 79 | * 3. check ACPI FADT revision | |
| 80 | * | |
| 81 | * We can parse ACPI boot-time tables such as MADT after | |
| 82 | * this function is called. | |
| 83 | */ | |
| 84 | void __init acpi_boot_table_init(void) | |
| 85 | { | |
| 86 | /* If acpi_disabled, bail out */ | |
| 87 | if (acpi_disabled) | |
| 88 | return; | |
| 89 | ||
| 90 | /* Initialize the ACPI boot-time table parser. */ | |
| 91 | if (acpi_table_init()) { | |
| 92 | disable_acpi(); | |
| 93 | return; | |
| 94 | } | |
| 95 | ||
| 96 | if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt)) { | |
| 97 | /* disable ACPI if no FADT is found */ | |
| 98 | disable_acpi(); | |
| 99 | pr_err("Can't find FADT\n"); | |
| 100 | } | |
| 101 | } |