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