1 /* SPDX-License-Identifier: GPL-2.0 */
3 * IRQ is a type of interrupt controller used on recent Intel SoC.
5 * Copyright 2019 Google LLC
12 struct ofnode_phandle_args;
15 * Interrupt controller types available. You can find a particular one with
16 * irq_first_device_type()
19 X86_IRQT_BASE, /* Base controller */
20 X86_IRQT_ITSS, /* ITSS controller, e.g. on APL */
21 X86_IRQT_ACPI_GPE, /* ACPI General-Purpose Events controller */
22 SANDBOX_IRQT_BASE, /* Sandbox testing */
26 * struct irq - A single irq line handled by an interrupt controller
28 * @dev: IRQ device that handles this irq
29 * @id: ID to identify this irq with the device
30 * @flags: Flags associated with this interrupt (IRQ_TYPE_...)
39 * struct irq_ops - Operations for the IRQ
41 * Each IRQ device can handle mulitple IRQ lines
45 * route_pmc_gpio_gpe() - Get the GPIO for an event
48 * @pmc_gpe_num: Event number to check
49 * @returns GPIO for the event, or -ENOENT if none
51 int (*route_pmc_gpio_gpe)(struct udevice *dev, uint pmc_gpe_num);
54 * set_polarity() - Set the IRQ polarity
57 * @irq: Interrupt number to set
58 * @active_low: true if active low, false for active high
59 * @return 0 if OK, -EINVAL if @irq is invalid
61 int (*set_polarity)(struct udevice *dev, uint irq, bool active_low);
64 * snapshot_polarities() - record IRQ polarities for later restore
69 int (*snapshot_polarities)(struct udevice *dev);
72 * restore_polarities() - restore IRQ polarities
77 int (*restore_polarities)(struct udevice *dev);
80 * read_and_clear() - get the value of an interrupt and clear it
82 * Clears the interrupt if pending
85 * @return 0 if interrupt is not pending, 1 if it was (and so has been
86 * cleared), -ve on error
88 int (*read_and_clear)(struct irq *irq);
90 * of_xlate - Translate a client's device-tree (OF) irq specifier.
92 * The irq core calls this function as the first step in implementing
93 * a client's irq_get_by_*() call.
95 * If this function pointer is set to NULL, the irq core will use a
96 * default implementation, which assumes #interrupt-cells = <1>, and
97 * that the DT cell contains a simple integer irq ID.
99 * @irq: The irq struct to hold the translation result.
100 * @args: The irq specifier values from device tree.
101 * @return 0 if OK, or a negative error code.
103 int (*of_xlate)(struct irq *irq, struct ofnode_phandle_args *args);
105 * request - Request a translated irq.
107 * The irq core calls this function as the second step in
108 * implementing a client's irq_get_by_*() call, following a successful
109 * xxx_xlate() call, or as the only step in implementing a client's
110 * irq_request() call.
112 * @irq: The irq struct to request; this has been fille in by
113 * a previoux xxx_xlate() function call, or by the caller
115 * @return 0 if OK, or a negative error code.
117 int (*request)(struct irq *irq);
119 * free - Free a previously requested irq.
121 * This is the implementation of the client irq_free() API.
123 * @irq: The irq to free.
124 * @return 0 if OK, or a negative error code.
126 int (*free)(struct irq *irq);
128 #if CONFIG_IS_ENABLED(ACPIGEN)
130 * get_acpi() - Get the ACPI info for an irq
132 * This converts a irq to an ACPI structure for adding to the ACPI
135 * @irq: irq to convert
136 * @acpi_irq: Output ACPI interrupt information
137 * @return ACPI pin number or -ve on error
139 int (*get_acpi)(const struct irq *irq, struct acpi_irq *acpi_irq);
143 #define irq_get_ops(dev) ((struct irq_ops *)(dev)->driver->ops)
146 * irq_is_valid() - Check if an IRQ is valid
148 * @irq: IRQ description containing device and ID, e.g. previously
149 * returned by irq_get_by_index()
150 * @return true if valid, false if not
152 static inline bool irq_is_valid(const struct irq *irq)
154 return irq->dev != NULL;
158 * irq_route_pmc_gpio_gpe() - Get the GPIO for an event
161 * @pmc_gpe_num: Event number to check
162 * @returns GPIO for the event, or -ENOENT if none
164 int irq_route_pmc_gpio_gpe(struct udevice *dev, uint pmc_gpe_num);
167 * irq_set_polarity() - Set the IRQ polarity
170 * @irq: Interrupt number to set
171 * @active_low: true if active low, false for active high
172 * @return 0 if OK, -EINVAL if @irq is invalid
174 int irq_set_polarity(struct udevice *dev, uint irq, bool active_low);
177 * irq_snapshot_polarities() - record IRQ polarities for later restore
182 int irq_snapshot_polarities(struct udevice *dev);
185 * irq_restore_polarities() - restore IRQ polarities
190 int irq_restore_polarities(struct udevice *dev);
193 * read_and_clear() - get the value of an interrupt and clear it
195 * Clears the interrupt if pending
198 * @return 0 if interrupt is not pending, 1 if it was (and so has been
199 * cleared), -ve on error
201 int irq_read_and_clear(struct irq *irq);
203 struct phandle_2_arg;
205 * irq_get_by_phandle() - Get an irq by its phandle information (of-platadata)
207 * This function is used when of-platdata is enabled.
209 * This looks up an irq using the phandle info. With dtoc, each phandle in the
210 * 'interrupts-extended ' property is transformed into an idx representing the
211 * device. For example:
213 * interrupts-extended = <&acpi_gpe 0x3c 0>;
217 * .interrupts_extended = {6, {0x3c, 0}},},
219 * indicating that the irq is udevice idx 6 in dt-plat.c with a arguments of
220 * 0x3c and 0.This function can return a valid irq given the above
221 * information. In this example it would return an irq containing the
222 * 'acpi_gpe' device and the irq ID 0x3c.
224 * @dev: Device containing the phandle
225 * @cells: Phandle info
226 * @irq: A pointer to a irq struct to initialise
227 * @return 0 if OK, or a negative error code
229 int irq_get_by_phandle(struct udevice *dev, const struct phandle_2_arg *cells,
233 * irq_get_by_index - Get/request an irq by integer index.
235 * This looks up and requests an irq. The index is relative to the client
236 * device; each device is assumed to have n irqs associated with it somehow,
237 * and this function finds and requests one of them. The mapping of client
238 * device irq indices to provider irqs may be via device-tree
239 * properties, board-provided mapping tables, or some other mechanism.
241 * @dev: The client device.
242 * @index: The index of the irq to request, within the client's list of
244 * @irq: A pointer to a irq struct to initialise.
245 * @return 0 if OK, or a negative error code.
247 int irq_get_by_index(struct udevice *dev, int index, struct irq *irq);
250 * irq_request - Request a irq by provider-specific ID.
252 * This requests a irq using a provider-specific ID. Generally, this function
253 * should not be used, since irq_get_by_index/name() provide an interface that
254 * better separates clients from intimate knowledge of irq providers.
255 * However, this function may be useful in core SoC-specific code.
257 * @dev: The irq provider device.
258 * @irq: A pointer to a irq struct to initialise. The caller must
259 * have already initialised any field in this struct which the
260 * irq provider uses to identify the irq.
261 * @return 0 if OK, or a negative error code.
263 int irq_request(struct udevice *dev, struct irq *irq);
266 * irq_free - Free a previously requested irq.
268 * @irq: A irq struct that was previously successfully requested by
269 * irq_request/get_by_*().
270 * @return 0 if OK, or a negative error code.
272 int irq_free(struct irq *irq);
275 * irq_first_device_type() - Get a particular interrupt controller
277 * On success this returns an activated interrupt device.
279 * @type: Type to find
280 * @devp: Returns the device, if found
281 * @return 0 if OK, -ENODEV if not found, other -ve error if uclass failed to
284 int irq_first_device_type(enum irq_dev_t type, struct udevice **devp);
287 * irq_get_acpi() - Get the ACPI info for an irq
289 * This converts a irq to an ACPI structure for adding to the ACPI
292 * @irq: irq to convert
293 * @acpi_irq: Output ACPI interrupt information
294 * @return ACPI pin number or -ve on error
296 int irq_get_acpi(const struct irq *irq, struct acpi_irq *acpi_irq);