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Date: Sat, 07 Mar 2015 23:05:02 +0000
From: Grant Likely <grant.likely@...aro.org>
To: Hanjun Guo <hanjun.guo@...aro.org>,
Catalin Marinas <catalin.marinas@....com>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Will Deacon <will.deacon@....com>,
Olof Johansson <olof@...om.net>
Cc: Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
Arnd Bergmann <arnd@...db.de>,
Mark Rutland <mark.rutland@....com>,
Graeme Gregory <graeme.gregory@...aro.org>,
Sudeep Holla <Sudeep.Holla@....com>,
Jon Masters <jcm@...hat.com>,
Marc Zyngier <marc.zyngier@....com>,
Mark Brown <broonie@...nel.org>,
Robert Richter <rric@...nel.org>,
Timur Tabi <timur@...eaurora.org>,
Ashwin Chaugule <ashwinc@...eaurora.org>,
suravee.suthikulpanit@....com, linux-acpi@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linaro-acpi@...ts.linaro.org, Hanjun Guo <hanjun.guo@...aro.org>
Subject: Re: [PATCH v9 15/21] ARM64 / ACPI: Introduce ACPI_IRQ_MODEL_GIC and
register device's gsi
On Wed, 25 Feb 2015 16:39:55 +0800
, Hanjun Guo <hanjun.guo@...aro.org>
wrote:
> 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@....com>
> Originally-by: Amit Daniel Kachhap <amit.daniel@...sung.com>
> Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
> Tested-by: Yijing Wang <wangyijing@...wei.com>
> Tested-by: Mark Langsdorf <mlangsdo@...hat.com>
> Tested-by: Jon Masters <jcm@...hat.com>
> Tested-by: Timur Tabi <timur@...eaurora.org>
> Tested-by: Robert Richter <rrichter@...ium.com>
> Acked-by: Robert Richter <rrichter@...ium.com>
> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
Reviewed-by: Grant Likely <grant.likely@...aro.org>
> ---
> arch/arm64/kernel/acpi.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++
> drivers/acpi/bus.c | 3 ++
> include/linux/acpi.h | 1 +
> 3 files changed, 77 insertions(+)
>
> diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
> index 0f35d87..31f080e 100644
> --- a/arch/arm64/kernel/acpi.c
> +++ b/arch/arm64/kernel/acpi.c
> @@ -76,6 +76,12 @@ 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.
> */
> @@ -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;
> diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
> index 8b67bd0..c412fdb 100644
> --- a/drivers/acpi/bus.c
> +++ b/drivers/acpi/bus.c
> @@ -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;
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index 0eabd15..c03d8d1 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -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
> };
>
> --
> 1.9.1
>
--
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