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- /*
- * ARM64 Specific Low-Level ACPI Boot Support
- *
- * Copyright (C) 2013-2014, Linaro Ltd.
- * Author: Al Stone <al.stone@linaro.org>
- * Author: Graeme Gregory <graeme.gregory@linaro.org>
- * Author: Hanjun Guo <hanjun.guo@linaro.org>
- * Author: Tomasz Nowicki <tomasz.nowicki@linaro.org>
- * Author: Naresh Bhat <naresh.bhat@linaro.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
- #define pr_fmt(fmt) "ACPI: " fmt
- #include <linux/acpi.h>
- #include <linux/bootmem.h>
- #include <linux/cpumask.h>
- #include <linux/init.h>
- #include <linux/irq.h>
- #include <linux/irqdomain.h>
- #include <linux/memblock.h>
- #include <linux/of_fdt.h>
- #include <linux/smp.h>
- #include <asm/cputype.h>
- #include <asm/cpu_ops.h>
- #include <asm/smp_plat.h>
- #ifdef CONFIG_ACPI_APEI
- # include <linux/efi.h>
- # include <asm/pgtable.h>
- #endif
- int acpi_noirq = 1; /* skip ACPI IRQ initialization */
- int acpi_disabled = 1;
- EXPORT_SYMBOL(acpi_disabled);
- int acpi_pci_disabled = 1; /* skip ACPI PCI scan and IRQ initialization */
- EXPORT_SYMBOL(acpi_pci_disabled);
- static bool param_acpi_off __initdata;
- static bool param_acpi_force __initdata;
- static int __init parse_acpi(char *arg)
- {
- if (!arg)
- return -EINVAL;
- /* "acpi=off" disables both ACPI table parsing and interpreter */
- if (strcmp(arg, "off") == 0)
- param_acpi_off = true;
- else if (strcmp(arg, "force") == 0) /* force ACPI to be enabled */
- param_acpi_force = true;
- else
- return -EINVAL; /* Core will print when we return error */
- return 0;
- }
- early_param("acpi", parse_acpi);
- static int __init dt_scan_depth1_nodes(unsigned long node,
- const char *uname, int depth,
- void *data)
- {
- /*
- * Return 1 as soon as we encounter a node at depth 1 that is
- * not the /chosen node.
- */
- if (depth == 1 && (strcmp(uname, "chosen") != 0))
- return 1;
- return 0;
- }
- /*
- * __acpi_map_table() will be called before page_init(), so early_ioremap()
- * or early_memremap() should be called here to for ACPI table mapping.
- */
- char *__init __acpi_map_table(unsigned long phys, unsigned long size)
- {
- if (!size)
- return NULL;
- return early_memremap(phys, size);
- }
- void __init __acpi_unmap_table(char *map, unsigned long size)
- {
- if (!map || !size)
- return;
- early_memunmap(map, size);
- }
- bool __init acpi_psci_present(void)
- {
- return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_COMPLIANT;
- }
- /* Whether HVC must be used instead of SMC as the PSCI conduit */
- bool __init acpi_psci_use_hvc(void)
- {
- return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_USE_HVC;
- }
- /*
- * acpi_fadt_sanity_check() - Check FADT presence and carry out sanity
- * checks on it
- *
- * Return 0 on success, <0 on failure
- */
- static int __init acpi_fadt_sanity_check(void)
- {
- struct acpi_table_header *table;
- struct acpi_table_fadt *fadt;
- acpi_status status;
- acpi_size tbl_size;
- int ret = 0;
- /*
- * FADT is required on arm64; retrieve it to check its presence
- * and carry out revision and ACPI HW reduced compliancy tests
- */
- status = acpi_get_table_with_size(ACPI_SIG_FADT, 0, &table, &tbl_size);
- if (ACPI_FAILURE(status)) {
- const char *msg = acpi_format_exception(status);
- pr_err("Failed to get FADT table, %s\n", msg);
- return -ENODEV;
- }
- fadt = (struct acpi_table_fadt *)table;
- /*
- * Revision in table header is the FADT Major revision, and there
- * is a minor revision of FADT which was introduced by ACPI 5.1,
- * we only deal with ACPI 5.1 or newer revision to get GIC and SMP
- * boot protocol configuration data.
- */
- if (table->revision < 5 ||
- (table->revision == 5 && fadt->minor_revision < 1)) {
- pr_err("Unsupported FADT revision %d.%d, should be 5.1+\n",
- table->revision, fadt->minor_revision);
- ret = -EINVAL;
- goto out;
- }
- if (!(fadt->flags & ACPI_FADT_HW_REDUCED)) {
- pr_err("FADT not ACPI hardware reduced compliant\n");
- ret = -EINVAL;
- }
- out:
- /*
- * acpi_get_table_with_size() creates FADT table mapping that
- * should be released after parsing and before resuming boot
- */
- early_acpi_os_unmap_memory(table, tbl_size);
- return ret;
- }
- /*
- * acpi_boot_table_init() called from setup_arch(), always.
- * 1. find RSDP and get its address, and then find XSDT
- * 2. extract all tables and checksums them all
- * 3. check ACPI FADT revision
- * 4. check ACPI FADT HW reduced flag
- *
- * We can parse ACPI boot-time tables such as MADT after
- * this function is called.
- *
- * On return ACPI is enabled if either:
- *
- * - ACPI tables are initialized and sanity checks passed
- * - acpi=force was passed in the command line and ACPI was not disabled
- * explicitly through acpi=off command line parameter
- *
- * ACPI is disabled on function return otherwise
- */
- void __init acpi_boot_table_init(void)
- {
- /*
- * Enable ACPI instead of device tree unless
- * - ACPI has been disabled explicitly (acpi=off), or
- * - the device tree is not empty (it has more than just a /chosen node)
- * and ACPI has not been force enabled (acpi=force)
- */
- if (param_acpi_off ||
- (!param_acpi_force && of_scan_flat_dt(dt_scan_depth1_nodes, NULL)))
- return;
- /*
- * ACPI is disabled at this point. Enable it in order to parse
- * the ACPI tables and carry out sanity checks
- */
- enable_acpi();
- /*
- * If ACPI tables are initialized and FADT sanity checks passed,
- * leave ACPI enabled and carry on booting; otherwise disable ACPI
- * on initialization error.
- * If acpi=force was passed on the command line it forces ACPI
- * to be enabled even if its initialization failed.
- */
- if (acpi_table_init() || acpi_fadt_sanity_check()) {
- pr_err("Failed to init ACPI tables\n");
- if (!param_acpi_force)
- disable_acpi();
- }
- }
- #ifdef CONFIG_ACPI_APEI
- pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr)
- {
- /*
- * According to "Table 8 Map: EFI memory types to AArch64 memory
- * types" of UEFI 2.5 section 2.3.6.1, each EFI memory type is
- * mapped to a corresponding MAIR attribute encoding.
- * The EFI memory attribute advises all possible capabilities
- * of a memory region. We use the most efficient capability.
- */
- u64 attr;
- attr = efi_mem_attributes(addr);
- if (attr & EFI_MEMORY_WB)
- return PAGE_KERNEL;
- if (attr & EFI_MEMORY_WT)
- return __pgprot(PROT_NORMAL_WT);
- if (attr & EFI_MEMORY_WC)
- return __pgprot(PROT_NORMAL_NC);
- return __pgprot(PROT_DEVICE_nGnRnE);
- }
- #endif
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