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