346 lines
8.6 KiB
C
346 lines
8.6 KiB
C
/*
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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/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 <asm/cputype.h>
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#include <asm/cpu_ops.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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/* Processors with enabled flag and sane MPIDR */
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static int enabled_cpus;
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/* Boot CPU is valid or not in MADT */
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static bool bootcpu_valid __initdata;
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static bool param_acpi_off __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, "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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* Return 1 as soon as we encounter a node at depth 1 that is
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* not the /chosen node.
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*/
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if (depth == 1 && (strcmp(uname, "chosen") != 0))
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return 1;
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return 0;
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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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char *__init __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(char *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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/**
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* acpi_map_gic_cpu_interface - generates a logical cpu number
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* and map to MPIDR represented by GICC structure
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*/
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static void __init
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acpi_map_gic_cpu_interface(struct acpi_madt_generic_interrupt *processor)
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{
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int i;
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u64 mpidr = processor->arm_mpidr & MPIDR_HWID_BITMASK;
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bool enabled = !!(processor->flags & ACPI_MADT_ENABLED);
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if (mpidr == INVALID_HWID) {
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pr_info("Skip MADT cpu entry with invalid MPIDR\n");
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return;
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}
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total_cpus++;
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if (!enabled)
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return;
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if (enabled_cpus >= NR_CPUS) {
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pr_warn("NR_CPUS limit of %d reached, Processor %d/0x%llx ignored.\n",
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NR_CPUS, total_cpus, mpidr);
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return;
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}
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/* Check if GICC structure of boot CPU is available in the MADT */
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if (cpu_logical_map(0) == mpidr) {
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if (bootcpu_valid) {
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pr_err("Firmware bug, duplicate CPU MPIDR: 0x%llx in MADT\n",
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mpidr);
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return;
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}
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bootcpu_valid = true;
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}
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/*
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* Duplicate MPIDRs are a recipe for disaster. Scan
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* all initialized entries and check for
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* duplicates. If any is found just ignore the CPU.
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*/
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for (i = 1; i < enabled_cpus; i++) {
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if (cpu_logical_map(i) == mpidr) {
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pr_err("Firmware bug, duplicate CPU MPIDR: 0x%llx in MADT\n",
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mpidr);
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return;
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}
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}
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if (!acpi_psci_present())
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return;
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cpu_ops[enabled_cpus] = cpu_get_ops("psci");
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/* CPU 0 was already initialized */
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if (enabled_cpus) {
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if (!cpu_ops[enabled_cpus])
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return;
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if (cpu_ops[enabled_cpus]->cpu_init(NULL, enabled_cpus))
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return;
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/* map the logical cpu id to cpu MPIDR */
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cpu_logical_map(enabled_cpus) = mpidr;
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}
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enabled_cpus++;
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}
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static int __init
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acpi_parse_gic_cpu_interface(struct acpi_subtable_header *header,
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const unsigned long end)
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{
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struct acpi_madt_generic_interrupt *processor;
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processor = (struct acpi_madt_generic_interrupt *)header;
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if (BAD_MADT_ENTRY(processor, end))
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return -EINVAL;
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acpi_table_print_madt_entry(header);
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acpi_map_gic_cpu_interface(processor);
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return 0;
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}
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/* Parse GIC cpu interface entries in MADT for SMP init */
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void __init acpi_init_cpus(void)
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{
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int count, i;
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/*
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* do a partial walk of MADT to determine how many CPUs
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* we have including disabled CPUs, and get information
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* we need for SMP init
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*/
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count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
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acpi_parse_gic_cpu_interface, 0);
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if (!count) {
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pr_err("No GIC CPU interface entries present\n");
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return;
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} else if (count < 0) {
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pr_err("Error parsing GIC CPU interface entry\n");
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return;
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}
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if (!bootcpu_valid) {
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pr_err("MADT missing boot CPU MPIDR, not enabling secondaries\n");
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return;
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}
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for (i = 0; i < enabled_cpus; i++)
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set_cpu_possible(i, true);
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/* Make boot-up look pretty */
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pr_info("%d CPUs enabled, %d CPUs total\n", enabled_cpus, total_cpus);
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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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acpi_size tbl_size;
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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_with_size(ACPI_SIG_FADT, 0, &table, &tbl_size);
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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("Unsupported FADT revision %d.%d, should be 5.1+\n",
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table->revision, fadt->minor_revision);
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ret = -EINVAL;
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goto out;
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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_with_size() 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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early_acpi_os_unmap_memory(table, tbl_size);
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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 ACPI has not been force enabled (acpi=force)
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*/
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if (param_acpi_off ||
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(!param_acpi_force && of_scan_flat_dt(dt_scan_depth1_nodes, NULL)))
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return;
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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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}
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void __init acpi_gic_init(void)
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{
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struct acpi_table_header *table;
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acpi_status status;
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acpi_size tbl_size;
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int err;
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if (acpi_disabled)
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return;
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status = acpi_get_table_with_size(ACPI_SIG_MADT, 0, &table, &tbl_size);
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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 MADT table, %s\n", msg);
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return;
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}
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err = gic_v2_acpi_init(table);
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if (err)
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pr_err("Failed to initialize GIC IRQ controller");
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early_acpi_os_unmap_memory((char *)table, tbl_size);
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}
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