/*
 *  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);
}

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();
        }
}

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);
}