On 2014-8-19 2:34, Sudeep Holla wrote:
>
>
> On 04/08/14 16:28, 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.
>>
>> Originally-by: Amit Daniel Kachhap <amit.daniel@xxxxxxxxxxx>
>> 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 ac7ab34..621ced8 100644
>> --- a/arch/arm64/kernel/acpi.c
>> +++ b/arch/arm64/kernel/acpi.c
>> @@ -34,6 +34,12 @@ EXPORT_SYMBOL(acpi_pci_disabled);
>> static int enabled_cpus; /* Processors (GICC) with enabled flag in MADT */
>>
>> /*
>> + * 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.
>> */
>> @@ -169,6 +175,73 @@ static int __init
>> acpi_parse_madt_gic_cpu_interface_entries(void)
>> return 0;
>> }
>>
>> +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);
>> +
>
> Not sure if acpi_gsi_to_irq and acpi_{,un}register_gsi belong here.
> These are GIC specific and should belong to GIC driver IMO.
I think we can keep them here as GSI is ACPI specific and they are
not GIC init related.
Thanks
Hanjun
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