On Wed, Mar 11, 2015 at 12:39:41PM +0000, Hanjun Guo 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@xxxxxxx>
> Originally-by: Amit Daniel Kachhap <amit.daniel@xxxxxxxxxxx>
> Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
> Tested-by: Yijing Wang <wangyijing@xxxxxxxxxx>
> Tested-by: Mark Langsdorf <mlangsdo@xxxxxxxxxx>
> Tested-by: Jon Masters <jcm@xxxxxxxxxx>
> Tested-by: Timur Tabi <timur@xxxxxxxxxxxxxx>
> Tested-by: Robert Richter <rrichter@xxxxxxxxxx>
> Acked-by: Robert Richter <rrichter@xxxxxxxxxx>
> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> Reviewed-by: Grant Likely <grant.likely@xxxxxxxxxx>
> Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
> ---
> 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 c9203c0..dec6f8a 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);
I see you've still got this buried in the arch code. Is there any plan to
move it out, as I moaned about this in the last version of the series and
nothing seems to have changed?
Will
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