ARM64 / ACPI: Get RSDP and ACPI boot-time tables

As we want to get ACPI tables to parse and then use the information
for system initialization, we should get the RSDP (Root System
Description Pointer) first, it then locates Extended Root Description
Table (XSDT) which contains all the 64-bit physical address that
pointer to other boot-time tables.

Introduce acpi.c and its related head file in this patch to provide
fundamental needs of extern variables and functions for ACPI core,
and then get boot-time tables as needed.
  - asm/acenv.h for arch specific ACPICA environments and
    implementation, It is needed unconditionally by ACPI core;
  - asm/acpi.h for arch specific variables and functions needed by
    ACPI driver core;
  - acpi.c for ARM64 related ACPI implementation for ACPI driver
    core;

acpi_boot_table_init() is introduced to get RSDP and boot-time tables,
it will be called in setup_arch() before paging_init(), so we should
use eary_memremap() mechanism here to get the RSDP and all the table
pointers.

FADT Major.Minor version was introduced in ACPI 5.1, it is the same
as ACPI version.

In ACPI 5.1, some major gaps are fixed for ARM, such as updates in
MADT table for GIC and SMP init, without those updates, we can not
get the MPIDR for SMP init, and GICv2/3 related init information, so
we can't boot arm64 ACPI properly with table versions predating 5.1.

If firmware provides ACPI tables with ACPI version less than 5.1,
OS has no way to retrieve the configuration data that is necessary
to init SMP boot protocol and the GIC properly, so disable ACPI if
we get an FADT table with version less that 5.1 when acpi_boot_table_init()
called.

CC: Catalin Marinas <catalin.marinas@arm.com>
CC: Will Deacon <will.deacon@arm.com>
CC: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Tested-by: Yijing Wang <wangyijing@huawei.com>
Tested-by: Mark Langsdorf <mlangsdo@redhat.com>
Tested-by: Jon Masters <jcm@redhat.com>
Tested-by: Timur Tabi <timur@codeaurora.org>
Tested-by: Robert Richter <rrichter@cavium.com>
Acked-by: Robert Richter <rrichter@cavium.com>
Acked-by: Olof Johansson <olof@lixom.net>
Acked-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Al Stone <al.stone@linaro.org>
Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
Signed-off-by: Tomasz Nowicki <tomasz.nowicki@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

3 files changed, 107 insertions, 0 deletions

diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index 5ee07eee80c2..fdc7877f2a3c 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -35,6 +35,7 @@ arm64-obj-$(CONFIG_KGDB)		+= kgdb.o
 arm64-obj-$(CONFIG_EFI)                 += efi.o efi-stub.o efi-entry.o
 arm64-obj-$(CONFIG_PCI)                 += pci.o
 arm64-obj-$(CONFIG_ARMV8_DEPRECATED)    += armv8_deprecated.o
+arm64-obj-$(CONFIG_ACPI)                += acpi.o
 
 obj-y                                   += $(arm64-obj-y) vdso/
 obj-m                                   += $(arm64-obj-m)
diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
new file mode 100644
index 000000000000..7abac24d5584
--- /dev/null
+++ b/arch/arm64/kernel/acpi.c
@@ -0,0 +1,101 @@
+/*
+ *  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/smp.h>
+
+int acpi_noirq;                 /* skip ACPI IRQ initialization */
+int acpi_disabled;
+EXPORT_SYMBOL(acpi_disabled);
+
+int acpi_pci_disabled;          /* skip ACPI PCI scan and IRQ initialization */
+EXPORT_SYMBOL(acpi_pci_disabled);
+
+/*
+ * __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);
+}
+
+static int __init acpi_parse_fadt(struct acpi_table_header *table)
+{
+        struct acpi_table_fadt *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, or we will disable ACPI.
+         */
+        if (table->revision > 5 ||
+            (table->revision == 5 && fadt->minor_revision >= 1))
+                return 0;
+
+        pr_warn("Unsupported FADT revision %d.%d, should be 5.1+, will disable ACPI\n",
+                table->revision, fadt->minor_revision);
+        disable_acpi();
+
+        return -EINVAL;
+}
+
+/*
+ * 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
+ *
+ * We can parse ACPI boot-time tables such as MADT after
+ * this function is called.
+ */
+void __init acpi_boot_table_init(void)
+{
+        /* If acpi_disabled, bail out */
+        if (acpi_disabled)
+                return;
+
+        /* Initialize the ACPI boot-time table parser. */
+        if (acpi_table_init()) {
+                disable_acpi();
+                return;
+        }
+
+        if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt)) {
+                /* disable ACPI if no FADT is found */
+                disable_acpi();
+                pr_err("Can't find FADT\n");
+        }
+}
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index e8420f635bd4..4f1a014ace39 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -17,6 +17,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <linux/acpi.h>
 #include <linux/export.h>
 #include <linux/kernel.h>
 #include <linux/stddef.h>
@@ -46,6 +47,7 @@
 #include <linux/efi.h>
 #include <linux/personality.h>
 
+#include <asm/acpi.h>
 #include <asm/fixmap.h>
 #include <asm/cpu.h>
 #include <asm/cputype.h>
@@ -380,6 +382,9 @@ void __init setup_arch(char **cmdline_p)
         efi_init();
         arm64_memblock_init();
 
+        /* Parse the ACPI tables for possible boot-time configuration */
+        acpi_boot_table_init();
+
         paging_init();
         request_standard_resources();