Commit fbe61ec7 authored by Hanjun Guo's avatar Hanjun Guo Committed by Will Deacon
Browse files

ARM64 / ACPI: Introduce ACPI_IRQ_MODEL_GIC and register device's gsi 



Introduce ACPI_IRQ_MODEL_GIC which is needed for ARM64 as GIC is
used, and then register device's gsi with the core IRQ subsystem.

acpi_register_gsi() is similar to DT based irq_of_parse_and_map(),
since gsi is unique in the system, so use hwirq number directly
for the mapping.

We are going to implement stacked domains when GICv2m, GICv3, ITS
support are added.

CC: Marc Zyngier <marc.zyngier@arm.com>
Originally-by: default avatarAmit Daniel Kachhap <amit.daniel@samsung.com>
Tested-by: default avatarSuravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Tested-by: default avatarYijing Wang <wangyijing@huawei.com>
Tested-by: default avatarMark Langsdorf <mlangsdo@redhat.com>
Tested-by: default avatarJon Masters <jcm@redhat.com>
Tested-by: default avatarTimur Tabi <timur@codeaurora.org>
Tested-by: default avatarRobert Richter <rrichter@cavium.com>
Acked-by: default avatarRobert Richter <rrichter@cavium.com>
Acked-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: default avatarGrant Likely <grant.likely@linaro.org>
Signed-off-by: default avatarHanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 020295b4

arch/arm64/kernel/acpi.c

+73 −0
Original line number Diff line number Diff line
@@ -75,6 +75,12 @@ static int __init dt_scan_depth1_nodes(unsigned long node, 
	return 0;

}



/*

 * 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.
@@ -218,6 +224,73 @@ 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;

drivers/acpi/bus.c

+3 −0
Original line number Diff line number Diff line
@@ -448,6 +448,9 @@ static int __init acpi_bus_init_irq(void) 
	case ACPI_IRQ_MODEL_IOSAPIC:

		message = "IOSAPIC";

		break;

	case ACPI_IRQ_MODEL_GIC:

		message = "GIC";

		break;

	case ACPI_IRQ_MODEL_PLATFORM:

		message = "platform specific model";

		break;

include/linux/acpi.h

+1 −0
Original line number Diff line number Diff line
@@ -73,6 +73,7 @@ enum acpi_irq_model_id { 
	ACPI_IRQ_MODEL_IOAPIC,

	ACPI_IRQ_MODEL_IOSAPIC,

	ACPI_IRQ_MODEL_PLATFORM,

	ACPI_IRQ_MODEL_GIC,

	ACPI_IRQ_MODEL_COUNT

};

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