Commit 16b2e6e2 authored by Grant Likely's avatar Grant Likely
Browse files

irq_domain: Create common xlate functions that device drivers can use 



Rather than having each interrupt controller driver creating its own barely
unique .xlate function for irq_domain, create a library of translators which
any driver can use directly.

v5: - Remove irq_domain_xlate_pci().  It was incorrect.

Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Mark Salter <msalter@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Milton Miller <miltonm@bga.com>
Tested-by: default avatarOlof Johansson <olof@lixom.net>
parent 6b783f7c

include/linux/irqdomain.h

+12 −0
Original line number Diff line number Diff line
@@ -163,6 +163,18 @@ extern unsigned int irq_linear_revmap(struct irq_domain *host, 
				      irq_hw_number_t hwirq);



extern struct irq_domain_ops irq_domain_simple_ops;



/* stock xlate functions */

int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,

			const u32 *intspec, unsigned int intsize,

			irq_hw_number_t *out_hwirq, unsigned int *out_type);

int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,

			const u32 *intspec, unsigned int intsize,

			irq_hw_number_t *out_hwirq, unsigned int *out_type);

int irq_domain_xlate_onetwocell(struct irq_domain *d, struct device_node *ctrlr,

			const u32 *intspec, unsigned int intsize,

			irq_hw_number_t *out_hwirq, unsigned int *out_type);



#if defined(CONFIG_OF_IRQ)

extern void irq_domain_generate_simple(const struct of_device_id *match,

					u64 phys_base, unsigned int irq_start);

kernel/irq/irqdomain.c

+55 −10
Original line number Diff line number Diff line
@@ -699,25 +699,70 @@ int irq_domain_simple_map(struct irq_domain *d, unsigned int irq, 
	return 0;

}



int irq_domain_simple_xlate(struct irq_domain *d,

			    struct device_node *controller,

/**

 * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings

 *

 * Device Tree IRQ specifier translation function which works with one cell

 * bindings where the cell value maps directly to the hwirq number.

 */

int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,

			     const u32 *intspec, unsigned int intsize,

			     unsigned long *out_hwirq, unsigned int *out_type)

{

	if (d->of_node != controller)

		return -EINVAL;

	if (intsize < 1)

	if (WARN_ON(intsize < 1))

		return -EINVAL;

	*out_hwirq = intspec[0];

	*out_type = IRQ_TYPE_NONE;

	if (intsize > 1)

	return 0;

}

EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);



/**

 * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings

 *

 * Device Tree IRQ specifier translation function which works with two cell

 * bindings where the cell values map directly to the hwirq number

 * and linux irq flags.

 */

int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,

			const u32 *intspec, unsigned int intsize,

			irq_hw_number_t *out_hwirq, unsigned int *out_type)

{

	if (WARN_ON(intsize < 2))

		return -EINVAL;

	*out_hwirq = intspec[0];

	*out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;

	return 0;

}

EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);



/**

 * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings

 *

 * Device Tree IRQ specifier translation function which works with either one

 * or two cell bindings where the cell values map directly to the hwirq number

 * and linux irq flags.

 *

 * Note: don't use this function unless your interrupt controller explicitly

 * supports both one and two cell bindings.  For the majority of controllers

 * the _onecell() or _twocell() variants above should be used.

 */

int irq_domain_xlate_onetwocell(struct irq_domain *d,

				struct device_node *ctrlr,

				const u32 *intspec, unsigned int intsize,

				unsigned long *out_hwirq, unsigned int *out_type)

{

	if (WARN_ON(intsize < 1))

		return -EINVAL;

	*out_hwirq = intspec[0];

	*out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE;

	return 0;

}

EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);



struct irq_domain_ops irq_domain_simple_ops = {

	.map = irq_domain_simple_map,

	.xlate = irq_domain_simple_xlate,

	.xlate = irq_domain_xlate_onetwocell,

};

EXPORT_SYMBOL_GPL(irq_domain_simple_ops);

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