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/* SPDX-License-Identifier: GPL-2.0 */
/*
* IRQ is a type of interrupt controller used on recent Intel SoC.
*
* Copyright 2019 Google LLC
*/
#ifndef __irq_H
#define __irq_H
/*
* Interrupt controller types available. You can find a particular one with
* irq_first_device_type()
*/
enum irq_dev_t {
X86_IRQT_BASE, /* Base controller */
X86_IRQT_ITSS, /* ITSS controller, e.g. on APL */
X86_IRQT_ACPI_GPE, /* ACPI General-Purpose Events controller */
SANDBOX_IRQT_BASE, /* Sandbox testing */
};
/**
* struct irq - A single irq line handled by an interrupt controller
*
* @dev: IRQ device that handles this irq
* @id: ID to identify this irq with the device
*/
struct irq {
struct udevice *dev;
ulong id;
};
/**
* struct irq_ops - Operations for the IRQ
*
* Each IRQ device can handle mulitple IRQ lines
*/
struct irq_ops {
/**
* route_pmc_gpio_gpe() - Get the GPIO for an event
*
* @dev: IRQ device
* @pmc_gpe_num: Event number to check
* @returns GPIO for the event, or -ENOENT if none
*/
int (*route_pmc_gpio_gpe)(struct udevice *dev, uint pmc_gpe_num);
/**
* set_polarity() - Set the IRQ polarity
*
* @dev: IRQ device
* @irq: Interrupt number to set
* @active_low: true if active low, false for active high
* @return 0 if OK, -EINVAL if @irq is invalid
*/
int (*set_polarity)(struct udevice *dev, uint irq, bool active_low);
/**
* snapshot_polarities() - record IRQ polarities for later restore
*
* @dev: IRQ device
* @return 0
*/
int (*snapshot_polarities)(struct udevice *dev);
/**
* restore_polarities() - restore IRQ polarities
*
* @dev: IRQ device
* @return 0
*/
int (*restore_polarities)(struct udevice *dev);
/**
* read_and_clear() - get the value of an interrupt and clear it
*
* Clears the interrupt if pending
*
* @irq: IRQ line
* @return 0 if interrupt is not pending, 1 if it was (and so has been
* cleared), -ve on error
*/
int (*read_and_clear)(struct irq *irq);
/**
* of_xlate - Translate a client's device-tree (OF) irq specifier.
*
* The irq core calls this function as the first step in implementing
* a client's irq_get_by_*() call.
*
* If this function pointer is set to NULL, the irq core will use a
* default implementation, which assumes #interrupt-cells = <1>, and
* that the DT cell contains a simple integer irq ID.
*
* @irq: The irq struct to hold the translation result.
* @args: The irq specifier values from device tree.
* @return 0 if OK, or a negative error code.
*/
int (*of_xlate)(struct irq *irq, struct ofnode_phandle_args *args);
/**
* request - Request a translated irq.
*
* The irq core calls this function as the second step in
* implementing a client's irq_get_by_*() call, following a successful
* xxx_xlate() call, or as the only step in implementing a client's
* irq_request() call.
*
* @irq: The irq struct to request; this has been fille in by
* a previoux xxx_xlate() function call, or by the caller
* of irq_request().
* @return 0 if OK, or a negative error code.
*/
int (*request)(struct irq *irq);
/**
* free - Free a previously requested irq.
*
* This is the implementation of the client irq_free() API.
*
* @irq: The irq to free.
* @return 0 if OK, or a negative error code.
*/
int (*free)(struct irq *irq);
};
#define irq_get_ops(dev) ((struct irq_ops *)(dev)->driver->ops)
/**
* irq_route_pmc_gpio_gpe() - Get the GPIO for an event
*
* @dev: IRQ device
* @pmc_gpe_num: Event number to check
* @returns GPIO for the event, or -ENOENT if none
*/
int irq_route_pmc_gpio_gpe(struct udevice *dev, uint pmc_gpe_num);
/**
* irq_set_polarity() - Set the IRQ polarity
*
* @dev: IRQ device
* @irq: Interrupt number to set
* @active_low: true if active low, false for active high
* @return 0 if OK, -EINVAL if @irq is invalid
*/
int irq_set_polarity(struct udevice *dev, uint irq, bool active_low);
/**
* irq_snapshot_polarities() - record IRQ polarities for later restore
*
* @dev: IRQ device
* @return 0
*/
int irq_snapshot_polarities(struct udevice *dev);
/**
* irq_restore_polarities() - restore IRQ polarities
*
* @dev: IRQ device
* @return 0
*/
int irq_restore_polarities(struct udevice *dev);
/**
* read_and_clear() - get the value of an interrupt and clear it
*
* Clears the interrupt if pending
*
* @dev: IRQ device
* @return 0 if interrupt is not pending, 1 if it was (and so has been
* cleared), -ve on error
*/
int irq_read_and_clear(struct irq *irq);
/**
* irq_get_by_index - Get/request an irq by integer index.
*
* This looks up and requests an irq. The index is relative to the client
* device; each device is assumed to have n irqs associated with it somehow,
* and this function finds and requests one of them. The mapping of client
* device irq indices to provider irqs may be via device-tree
* properties, board-provided mapping tables, or some other mechanism.
*
* @dev: The client device.
* @index: The index of the irq to request, within the client's list of
* irqs.
* @irq: A pointer to a irq struct to initialise.
* @return 0 if OK, or a negative error code.
*/
int irq_get_by_index(struct udevice *dev, int index, struct irq *irq);
/**
* irq_request - Request a irq by provider-specific ID.
*
* This requests a irq using a provider-specific ID. Generally, this function
* should not be used, since irq_get_by_index/name() provide an interface that
* better separates clients from intimate knowledge of irq providers.
* However, this function may be useful in core SoC-specific code.
*
* @dev: The irq provider device.
* @irq: A pointer to a irq struct to initialise. The caller must
* have already initialised any field in this struct which the
* irq provider uses to identify the irq.
* @return 0 if OK, or a negative error code.
*/
int irq_request(struct udevice *dev, struct irq *irq);
/**
* irq_free - Free a previously requested irq.
*
* @irq: A irq struct that was previously successfully requested by
* irq_request/get_by_*().
* @return 0 if OK, or a negative error code.
*/
int irq_free(struct irq *irq);
/**
* irq_first_device_type() - Get a particular interrupt controller
*
* On success this returns an activated interrupt device.
*
* @type: Type to find
* @devp: Returns the device, if found
* @return 0 if OK, -ENODEV if not found, other -ve error if uclass failed to
* probe
*/
int irq_first_device_type(enum irq_dev_t type, struct udevice **devp);
#endif
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