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authorTomasz Nowicki <tomasz.nowicki@linaro.org>2015-03-24 17:02:49 +0300
committerWill Deacon <will.deacon@arm.com>2015-03-26 18:13:07 +0300
commitd60fc3892c4de4a25658786f941690462c5a5bab (patch)
tree79273968cdae4cc73bd97a89e2c646431224e542 /arch/arm64/kernel/acpi.c
parentfbe61ec71ac975279cd47b6c299d5e33f63aac4e (diff)
downloadlinux-d60fc3892c4de4a25658786f941690462c5a5bab.tar.xz
irqchip: Add GICv2 specific ACPI boot support
ACPI kernel uses MADT table for proper GIC initialization. It needs to parse GIC related subtables, collect CPU interface and distributor addresses and call driver initialization function (which is hardware abstraction agnostic). In a similar way, FDT initialize GICv1/2. NOTE: This commit allow to initialize GICv1/2 basic functionality. While now simple GICv2 init call is used, any further GIC features require generic infrastructure for proper ACPI irqchip initialization. That mechanism and stacked irqdomains to support GICv2 MSI/virtualization extension, GICv3/4 and its ITS are considered as next steps. CC: Jason Cooper <jason@lakedaemon.net> CC: Marc Zyngier <marc.zyngier@arm.com> CC: Thomas Gleixner <tglx@linutronix.de> 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: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Jason Cooper <jason@lakedaemon.net> Reviewed-by: Grant Likely <grant.likely@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>
Diffstat (limited to 'arch/arm64/kernel/acpi.c')
-rw-r--r--arch/arm64/kernel/acpi.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
index dec6f8aed3dc..6468f8898530 100644
--- a/arch/arm64/kernel/acpi.c
+++ b/arch/arm64/kernel/acpi.c
@@ -359,3 +359,28 @@ void __init acpi_boot_table_init(void)
pr_err("Can't find FADT\n");
}
}
+
+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);
+}