From: Al Stone <al.stone@xxxxxxxxxx>
ACPI core need lots extern variables and functions which should
be provided by arch dependent code to make itself compilable. so
introduce arm-core.c and its related header file here, we need:
- asm/acenv.h for arch specific ACPICA environments and
implementation;
- asm/acpi.h for arch specific variables and functions needed by
ACPI driver core;
- arm-core.c for ARM64 related ACPI implementation for ACPI driver
core;
acpi_boot_table_init() 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. with this patch,
we can get ACPI boot-time tables from firmware on ARM64.
Reviewed-by: Grant Likely <grant.likely@xxxxxxxxxx>
Signed-off-by: Al Stone <al.stone@xxxxxxxxxx>
Signed-off-by: Graeme Gregory <graeme.gregory@xxxxxxxxxx>
Signed-off-by: Tomasz Nowicki <tomasz.nowicki@xxxxxxxxxx>
Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
---
arch/arm64/include/asm/acenv.h | 18 +++++++
arch/arm64/include/asm/acpi.h | 49 ++++++++++++++++++
arch/arm64/kernel/setup.c | 4 ++
drivers/acpi/Makefile | 2 +
drivers/acpi/plat/Makefile | 1 +
drivers/acpi/plat/arm-core.c | 110 ++++++++++++++++++++++++++++++++++++++++
6 files changed, 184 insertions(+)
create mode 100644 arch/arm64/include/asm/acenv.h
create mode 100644 arch/arm64/include/asm/acpi.h
create mode 100644 drivers/acpi/plat/Makefile
create mode 100644 drivers/acpi/plat/arm-core.c
diff --git a/arch/arm64/include/asm/acenv.h b/arch/arm64/include/asm/acenv.h
new file mode 100644
index 0000000..3899ee6
--- /dev/null
+++ b/arch/arm64/include/asm/acenv.h
@@ -0,0 +1,18 @@
+/*
+ * ARM64 specific ACPICA environments and implementation
+ *
+ * Copyright (C) 2014, Linaro Ltd.
+ * Author: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
+ * Author: Graeme Gregory <graeme.gregory@xxxxxxxxxx>
+ *
+ * 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.
+ */
+
+#ifndef _ASM_ACENV_H
+#define _ASM_ACENV_H
+
+#define ACPI_FLUSH_CPU_CACHE() WARN_ONCE(1, "Not currently supported on ARM64")
+
+#endif /* _ASM_ACENV_H */
diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
new file mode 100644
index 0000000..3ea6b84
--- /dev/null
+++ b/arch/arm64/include/asm/acpi.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2013-2014, Linaro Ltd.
+ * Author: Al Stone <al.stone@xxxxxxxxxx>
+ * Author: Graeme Gregory <graeme.gregory@xxxxxxxxxx>
+ * Author: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _ASM_ACPI_H
+#define _ASM_ACPI_H
+
+/* Basic configuration for ACPI */
+#ifdef CONFIG_ACPI
+extern int acpi_disabled;
+extern int acpi_noirq;
+extern int acpi_pci_disabled;
+extern int acpi_strict;
+
+static inline void disable_acpi(void)
+{
+ acpi_disabled = 1;
+ acpi_pci_disabled = 1;
+ acpi_noirq = 1;
+}
+
+/*
+ * The ACPI processor driver for ACPI core code needs this macro.
+ * Temporarily define it to -1 so that the ACPI core can compile,
+ * but update it when we get the hardware ID from the MADT table.
+ */
+#define cpu_physical_id(cpu) -1
+
+static inline bool acpi_arch_is_smp(void)
+{
+ return 1;
+}
+
+#endif /* CONFIG_ACPI */
+
+#endif /*_ASM_ACPI_H*/
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 46d1125..9dedb0b 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -43,6 +43,7 @@
#include <linux/of_fdt.h>
#include <linux/of_platform.h>
#include <linux/efi.h>
+#include <linux/acpi.h>
#include <asm/fixmap.h>
#include <asm/cputype.h>
@@ -385,6 +386,9 @@ 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();
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index b638e95..c50ea88 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -86,3 +86,5 @@ obj-$(CONFIG_ACPI_PROCESSOR_AGGREGATOR) += acpi_pad.o
obj-$(CONFIG_ACPI_APEI) += apei/
obj-$(CONFIG_ACPI_EXTLOG) += acpi_extlog.o
+
+obj-y += plat/
diff --git a/drivers/acpi/plat/Makefile b/drivers/acpi/plat/Makefile
new file mode 100644
index 0000000..46bc65e
--- /dev/null
+++ b/drivers/acpi/plat/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_ARM64) += arm-core.o
diff --git a/drivers/acpi/plat/arm-core.c b/drivers/acpi/plat/arm-core.c
new file mode 100644
index 0000000..c6c7e03
--- /dev/null
+++ b/drivers/acpi/plat/arm-core.c
@@ -0,0 +1,110 @@
+/*
+ * ARM/ARM64 Specific Low-Level ACPI Boot Support
+ *
+ * Copyright (C) 2013-2014, Linaro Ltd.
+ * Author: Al Stone <al.stone@xxxxxxxxxx>
+ * Author: Graeme Gregory <graeme.gregory@xxxxxxxxxx>
+ * Author: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/init.h>
+#include <linux/acpi.h>
+#include <linux/cpumask.h>
+#include <linux/memblock.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/bootmem.h>
+#include <linux/smp.h>
+
+#include <asm/pgtable.h>
+
+/*
+ * We never plan to use RSDT on arm/arm64 as its deprecated in spec but this
+ * variable is still required by the ACPI core
+ */
+u32 acpi_rsdt_forced;
+
+int acpi_noirq; /* skip ACPI IRQ initialization */
+int acpi_strict;
+int acpi_disabled;
+EXPORT_SYMBOL(acpi_disabled);
+
+int acpi_pci_disabled; /* skip ACPI PCI scan and IRQ initialization */
+EXPORT_SYMBOL(acpi_pci_disabled);
+
+enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PLATFORM;
+
+/*
+ * __acpi_map_table() will be called before page_init(), so early_ioremap()
+ * or early_memremap() should be called here.
+ */
+char *__init __acpi_map_table(unsigned long phys, unsigned long size)
+{
+ if (!phys || !size)
+ return NULL;
+
+ return early_memremap(phys, size);
+}
+
+void __init __acpi_unmap_table(char *map, unsigned long size)
+{
+ if (!map || !size)
+ return;
+
+ early_iounmap(map, size);
+}
+
+int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
+{
+ *irq = -1;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
+
+/*
+ * success: return IRQ number (>0)
+ * failure: return =< 0
+ */
+int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
+{
+ return -1;
+}
+EXPORT_SYMBOL_GPL(acpi_register_gsi);
+
+void acpi_unregister_gsi(u32 gsi)
+{
+}
+EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
+
+/*
+ * 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
+ *
+ * We can parse ACPI boot-time tables such as FADT, 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;
+ }
+}
--
1.7.9.5
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