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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>
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);
}
/*
* 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();
}
}
void __init acpi_gic_init(void)
{
struct acpi_table_header *table;
acpi_status status;
acpi_size tbl_size;
int err;
if (acpi_disabled)
return;
status = acpi_get_table_with_size(ACPI_SIG_MADT, 0, &table, &tbl_size);
if (ACPI_FAILURE(status)) {
const char *msg = acpi_format_exception(status);
pr_err("Failed to get MADT table, %s\n", msg);
return;
}
err = gic_v2_acpi_init(table);
if (err)
pr_err("Failed to initialize GIC IRQ controller");
early_acpi_os_unmap_memory((char *)table, tbl_size);
}
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