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authorHanjun Guo <hanjun.guo@linaro.org>2014-01-17 20:24:58 +0800
committerGraeme Gregory <graeme.gregory@linaro.org>2014-06-03 09:24:00 +0100
commitd7a0d346eb54e637272099b628f3c32665de5237 (patch)
tree52f92151b6c14bc7a753a6c2598d336b3c3b7086
parenta2d7c80b0390f7a252c018128f5182921d8a5c06 (diff)
downloadleg-kernel-d7a0d346eb54e637272099b628f3c32665de5237.tar.gz
ARM64 / ACPI: Introduce arm_core.c and its related head file
Introduce arm_core.c and its related head file, after this patch, we can get ACPI tables from firmware on ARM64 now. Signed-off-by: Al Stone <al.stone@linaro.org> Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org> Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
-rw-r--r--arch/arm64/include/asm/acpi.h57
-rw-r--r--arch/arm64/kernel/setup.c6
-rw-r--r--drivers/acpi/Makefile2
-rw-r--r--drivers/acpi/plat/Makefile1
-rw-r--r--drivers/acpi/plat/arm-core.c209
5 files changed, 275 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
index cf19dc6c24f6..908d71b7e776 100644
--- a/arch/arm64/include/asm/acpi.h
+++ b/arch/arm64/include/asm/acpi.h
@@ -19,6 +19,43 @@
#ifndef _ASM_ARM64_ACPI_H
#define _ASM_ARM64_ACPI_H
+#include <asm/cacheflush.h>
+
+#include <linux/init.h>
+
+#define COMPILER_DEPENDENT_INT64 s64
+#define COMPILER_DEPENDENT_UINT64 u64
+
+/*
+ * Calling conventions:
+ *
+ * ACPI_SYSTEM_XFACE - Interfaces to host OS (handlers, threads)
+ * ACPI_EXTERNAL_XFACE - External ACPI interfaces
+ * ACPI_INTERNAL_XFACE - Internal ACPI interfaces
+ * ACPI_INTERNAL_VAR_XFACE - Internal variable-parameter list interfaces
+ */
+#define ACPI_SYSTEM_XFACE
+#define ACPI_EXTERNAL_XFACE
+#define ACPI_INTERNAL_XFACE
+#define ACPI_INTERNAL_VAR_XFACE
+
+/* Asm macros */
+#define ACPI_FLUSH_CPU_CACHE() flush_cache_all()
+
+/* 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;
+}
+
static inline bool arch_has_acpi_pdc(void)
{
return false; /* always false for now */
@@ -29,4 +66,24 @@ static inline void arch_acpi_set_pdc_bits(u32 *buf)
return;
}
+static inline void acpi_noirq_set(void) { acpi_noirq = 1; }
+static inline void acpi_disable_pci(void)
+{
+ acpi_pci_disabled = 1;
+ acpi_noirq_set();
+}
+
+/* FIXME: this function should be moved to topology.h when it's ready */
+void arch_fix_phys_package_id(int num, u32 slot);
+
+/* temperally define -1 to make acpi core compilerable */
+#define cpu_physical_id(cpu) -1
+
+#else /* !CONFIG_ACPI */
+#define acpi_disabled 1 /* ACPI sometimes enabled on ARM */
+#define acpi_noirq 1 /* ACPI sometimes enabled on ARM */
+#define acpi_pci_disabled 1 /* ACPI PCI sometimes enabled on ARM */
+#define acpi_strict 1 /* no ACPI spec workarounds on ARM */
+#endif
+
#endif /*_ASM_ARM64_ACPI_H*/
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index e578171b22ff..42b297f6a714 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -42,6 +42,7 @@
#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>
@@ -371,6 +372,11 @@ 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();
+ early_acpi_boot_init();
+ acpi_boot_init();
+
paging_init();
request_standard_resources();
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 7c732c88ef92..551b6e7853f7 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -84,3 +84,5 @@ obj-$(CONFIG_ACPI_PROCESSOR_AGGREGATOR) += acpi_pad.o
obj-$(CONFIG_ACPI_APEI) += apei/
obj-$(CONFIG_ACPI_EXTLOG) += acpi_extlog.o
+
+obj-y += plat/
diff --git a/drivers/acpi/plat/Makefile b/drivers/acpi/plat/Makefile
new file mode 100644
index 000000000000..46bc65eda6d2
--- /dev/null
+++ b/drivers/acpi/plat/Makefile
@@ -0,0 +1 @@
+obj-$(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 000000000000..162a1ab56523
--- /dev/null
+++ b/drivers/acpi/plat/arm-core.c
@@ -0,0 +1,209 @@
+/*
+ * ARM/ARM64 Specific Low-Level ACPI Boot Support
+ *
+ * Copyright (C) 2013, Al Stone <al.stone@linaro.org>
+ * Copyright (C) 2013, Graeme Gregory <graeme.gregory@linaro.org>
+ * Copyright (C) 2013, Hanjun Guo <hanjun.guo@linaro.org>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * 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);
+
+#define PREFIX "ACPI: "
+
+/* FIXME: this function should be moved to topology.c when it is ready */
+void arch_fix_phys_package_id(int num, u32 slot)
+{
+ return;
+}
+EXPORT_SYMBOL_GPL(arch_fix_phys_package_id);
+
+enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PLATFORM;
+
+static unsigned int gsi_to_irq(unsigned int gsi)
+{
+ int irq = irq_create_mapping(NULL, gsi);
+
+ return irq;
+}
+
+/*
+ * __acpi_map_table() will be called before page_init(), so early_ioremap()
+ * or early_memremap() should be called here.
+ *
+ * FIXME: early_io/memremap()/early_iounmap() are not upstream yet on ARM64,
+ * just wait for Mark Salter's patchset accepted by mainline
+ */
+char *__init __acpi_map_table(unsigned long phys, unsigned long size)
+{
+ if (!phys || !size)
+ return NULL;
+
+ /*
+ * temporarily use phys_to_virt(),
+ * should be early_memremap(phys, size) here
+ */
+ return phys_to_virt(phys);
+}
+
+void __init __acpi_unmap_table(char *map, unsigned long size)
+{
+ if (!map || !size)
+ return;
+
+ /* should be early_iounmap(map, size); */
+ return;
+}
+
+int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
+{
+ *irq = gsi_to_irq(gsi);
+
+ 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);
+
+static int __init acpi_parse_fadt(struct acpi_table_header *table)
+{
+ return 0;
+}
+
+static void __init early_acpi_process_madt(void)
+{
+ return;
+}
+
+static void __init acpi_process_madt(void)
+{
+ return;
+}
+
+/*
+ * acpi_boot_table_init() and acpi_boot_init()
+ * called from setup_arch(), always.
+ * 1. checksums all tables
+ * 2. enumerates lapics
+ * 3. enumerates io-apics
+ *
+ * acpi_table_init() is separated to allow reading SRAT without
+ * other side effects.
+ */
+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;
+ }
+}
+
+int __init early_acpi_boot_init(void)
+{
+ /*
+ * If acpi_disabled, bail out
+ */
+ if (acpi_disabled)
+ return -ENODEV;
+
+ /*
+ * Process the Multiple APIC Description Table (MADT), if present
+ */
+ early_acpi_process_madt();
+
+ return 0;
+}
+
+int __init acpi_boot_init(void)
+{
+ /*
+ * If acpi_disabled, bail out
+ */
+ if (acpi_disabled)
+ return -ENODEV;
+
+ acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
+
+ /*
+ * Process the Multiple APIC Description Table (MADT), if present
+ */
+ acpi_process_madt();
+
+ return 0;
+}
+
+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) {
+ disable_acpi();
+ }
+ /* acpi=strict disables out-of-spec workarounds */
+ else if (strcmp(arg, "strict") == 0) {
+ acpi_strict = 1;
+ }
+ return 0;
+}
+early_param("acpi", parse_acpi);