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authorLorenzo Pieralisi <lorenzo.pieralisi@arm.com>2015-03-24 17:58:51 +0000
committerWill Deacon <will.deacon@arm.com>2015-03-26 15:13:09 +0000
commitd8f4f161e31f3ee9768467344e6cc31a0b9d9249 (patch)
tree428ed2902d784abc052f8160d1f6b3a21849b248
parent33757ded074918eb49243968a82e7c9ec2d71720 (diff)
downloadlinux-d8f4f161e31f3ee9768467344e6cc31a0b9d9249.tar.bz2
ACPI: move arm64 GSI IRQ model to generic GSI IRQ layer
The code deployed to implement GSI linux IRQ numbers mapping on arm64 turns out to be generic enough so that it can be moved to ACPI core code along with its respective config option ACPI_GENERIC_GSI selectable on architectures that can reuse the same code. Current ACPI IRQ mapping code is not integrated in the kernel IRQ domain infrastructure, in particular there is no way to look-up the IRQ domain associated with a particular interrupt controller, so this first version of GSI generic code carries out the GSI<->IRQ mapping relying on the IRQ default domain which is supposed to be always set on a specific architecture in case the domain structure passed to irq_create/find_mapping() functions is missing. This patch moves the arm64 acpi functions that implement the gsi mappings: acpi_gsi_to_irq() acpi_register_gsi() acpi_unregister_gsi() to ACPI core code. Since the generic GSI<->domain mapping is based on IRQ domains, it can be extended as soon as a way to map an interrupt controller to an IRQ domain is implemented for ACPI in the IRQ domain layer. x86 and ia64 code for GSI mappings cannot rely on the generic GSI layer at present for legacy reasons, so they do not select the ACPI_GENERIC_GSI config options and keep relying on their arch specific GSI mapping layer. Cc: Jiang Liu <jiang.liu@linux.intel.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Acked-by: Hanjun Guo <hanjun.guo@linaro.org> Acked-by: Will Deacon <will.deacon@arm.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
-rw-r--r--arch/arm64/Kconfig1
-rw-r--r--arch/arm64/kernel/acpi.c73
-rw-r--r--drivers/acpi/Kconfig3
-rw-r--r--drivers/acpi/Makefile1
-rw-r--r--drivers/acpi/gsi.c105
-rw-r--r--drivers/irqchip/irq-gic.c2
6 files changed, 112 insertions, 73 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index e5aa081b4845..0659db374731 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1,5 +1,6 @@
config ARM64
def_bool y
+ select ACPI_GENERIC_GSI if ACPI
select ACPI_REDUCED_HARDWARE_ONLY if ACPI
select ARCH_BINFMT_ELF_RANDOMIZE_PIE
select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
index fe9d8f0df4a3..a70f7141c0f6 100644
--- a/arch/arm64/kernel/acpi.c
+++ b/arch/arm64/kernel/acpi.c
@@ -76,12 +76,6 @@ static int __init dt_scan_depth1_nodes(unsigned long node,
}
/*
- * Since we're on ARM, the default interrupt routing model
- * clearly has to be GIC.
- */
-enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_GIC;
-
-/*
* __acpi_map_table() will be called before page_init(), so early_ioremap()
* or early_memremap() should be called here to for ACPI table mapping.
*/
@@ -224,73 +218,6 @@ void __init acpi_init_cpus(void)
pr_info("%d CPUs enabled, %d CPUs total\n", enabled_cpus, total_cpus);
}
-int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
-{
- *irq = irq_find_mapping(NULL, 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)
-{
- unsigned int irq;
- unsigned int irq_type;
-
- /*
- * ACPI have no bindings to indicate SPI or PPI, so we
- * use different mappings from DT in ACPI.
- *
- * For FDT
- * PPI interrupt: in the range [0, 15];
- * SPI interrupt: in the range [0, 987];
- *
- * For ACPI, GSI should be unique so using
- * the hwirq directly for the mapping:
- * PPI interrupt: in the range [16, 31];
- * SPI interrupt: in the range [32, 1019];
- */
-
- if (trigger == ACPI_EDGE_SENSITIVE &&
- polarity == ACPI_ACTIVE_LOW)
- irq_type = IRQ_TYPE_EDGE_FALLING;
- else if (trigger == ACPI_EDGE_SENSITIVE &&
- polarity == ACPI_ACTIVE_HIGH)
- irq_type = IRQ_TYPE_EDGE_RISING;
- else if (trigger == ACPI_LEVEL_SENSITIVE &&
- polarity == ACPI_ACTIVE_LOW)
- irq_type = IRQ_TYPE_LEVEL_LOW;
- else if (trigger == ACPI_LEVEL_SENSITIVE &&
- polarity == ACPI_ACTIVE_HIGH)
- irq_type = IRQ_TYPE_LEVEL_HIGH;
- else
- irq_type = IRQ_TYPE_NONE;
-
- /*
- * Since only one GIC is supported in ACPI 5.0, we can
- * create mapping refer to the default domain
- */
- irq = irq_create_mapping(NULL, gsi);
- if (!irq)
- return irq;
-
- /* Set irq type if specified and different than the current one */
- if (irq_type != IRQ_TYPE_NONE &&
- irq_type != irq_get_trigger_type(irq))
- irq_set_irq_type(irq, irq_type);
- return irq;
-}
-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)
{
struct acpi_table_fadt *fadt = (struct acpi_table_fadt *)table;
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index a8f531e2b97c..ab2cbb51c6aa 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -48,6 +48,9 @@ config ACPI_LEGACY_TABLES_LOOKUP
config ARCH_MIGHT_HAVE_ACPI_PDC
bool
+config ACPI_GENERIC_GSI
+ bool
+
config ACPI_SYSTEM_POWER_STATES_SUPPORT
bool
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index db153c6a75d7..8a063e276530 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -56,6 +56,7 @@ ifdef CONFIG_ACPI_VIDEO
acpi-y += video_detect.o
endif
acpi-y += acpi_lpat.o
+acpi-$(CONFIG_ACPI_GENERIC_GSI) += gsi.o
# These are (potentially) separate modules
diff --git a/drivers/acpi/gsi.c b/drivers/acpi/gsi.c
new file mode 100644
index 000000000000..38208f2d0e69
--- /dev/null
+++ b/drivers/acpi/gsi.c
@@ -0,0 +1,105 @@
+/*
+ * ACPI GSI IRQ layer
+ *
+ * Copyright (C) 2015 ARM Ltd.
+ * Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
+ *
+ * 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.
+ */
+#include <linux/acpi.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+
+enum acpi_irq_model_id acpi_irq_model;
+
+static unsigned int acpi_gsi_get_irq_type(int trigger, int polarity)
+{
+ switch (polarity) {
+ case ACPI_ACTIVE_LOW:
+ return trigger == ACPI_EDGE_SENSITIVE ?
+ IRQ_TYPE_EDGE_FALLING :
+ IRQ_TYPE_LEVEL_LOW;
+ case ACPI_ACTIVE_HIGH:
+ return trigger == ACPI_EDGE_SENSITIVE ?
+ IRQ_TYPE_EDGE_RISING :
+ IRQ_TYPE_LEVEL_HIGH;
+ case ACPI_ACTIVE_BOTH:
+ if (trigger == ACPI_EDGE_SENSITIVE)
+ return IRQ_TYPE_EDGE_BOTH;
+ default:
+ return IRQ_TYPE_NONE;
+ }
+}
+
+/**
+ * acpi_gsi_to_irq() - Retrieve the linux irq number for a given GSI
+ * @gsi: GSI IRQ number to map
+ * @irq: pointer where linux IRQ number is stored
+ *
+ * irq location updated with irq value [>0 on success, 0 on failure]
+ *
+ * Returns: linux IRQ number on success (>0)
+ * -EINVAL on failure
+ */
+int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
+{
+ /*
+ * Only default domain is supported at present, always find
+ * the mapping corresponding to default domain by passing NULL
+ * as irq_domain parameter
+ */
+ *irq = irq_find_mapping(NULL, gsi);
+ /*
+ * *irq == 0 means no mapping, that should
+ * be reported as a failure
+ */
+ return (*irq > 0) ? *irq : -EINVAL;
+}
+EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
+
+/**
+ * acpi_register_gsi() - Map a GSI to a linux IRQ number
+ * @dev: device for which IRQ has to be mapped
+ * @gsi: GSI IRQ number
+ * @trigger: trigger type of the GSI number to be mapped
+ * @polarity: polarity of the GSI to be mapped
+ *
+ * Returns: a valid linux IRQ number on success
+ * -EINVAL on failure
+ */
+int acpi_register_gsi(struct device *dev, u32 gsi, int trigger,
+ int polarity)
+{
+ unsigned int irq;
+ unsigned int irq_type = acpi_gsi_get_irq_type(trigger, polarity);
+
+ /*
+ * There is no way at present to look-up the IRQ domain on ACPI,
+ * hence always create mapping referring to the default domain
+ * by passing NULL as irq_domain parameter
+ */
+ irq = irq_create_mapping(NULL, gsi);
+ if (!irq)
+ return -EINVAL;
+
+ /* Set irq type if specified and different than the current one */
+ if (irq_type != IRQ_TYPE_NONE &&
+ irq_type != irq_get_trigger_type(irq))
+ irq_set_irq_type(irq, irq_type);
+ return irq;
+}
+EXPORT_SYMBOL_GPL(acpi_register_gsi);
+
+/**
+ * acpi_unregister_gsi() - Free a GSI<->linux IRQ number mapping
+ * @gsi: GSI IRQ number
+ */
+void acpi_unregister_gsi(u32 gsi)
+{
+ int irq = irq_find_mapping(NULL, gsi);
+
+ irq_dispose_mapping(irq);
+}
+EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index d15a36a93c52..f1efb53faebc 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -1189,6 +1189,8 @@ gic_v2_acpi_init(struct acpi_table_header *table)
*/
gic_init_bases(0, -1, dist_base, cpu_base, 0, NULL);
irq_set_default_host(gic_data[0].domain);
+
+ acpi_irq_model = ACPI_IRQ_MODEL_GIC;
return 0;
}
#endif