Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * ACPI GSI IRQ layer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2015 ARM Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/acpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/irqdomain.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) enum acpi_irq_model_id acpi_irq_model;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) static struct fwnode_handle *acpi_gsi_domain_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  * acpi_gsi_to_irq() - Retrieve the linux irq number for a given GSI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  * @gsi: GSI IRQ number to map
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  * @irq: pointer where linux IRQ number is stored
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  * irq location updated with irq value [>0 on success, 0 on failure]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  * Returns: 0 on success
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  *          -EINVAL on failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	struct irq_domain *d = irq_find_matching_fwnode(acpi_gsi_domain_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 							DOMAIN_BUS_ANY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	*irq = irq_find_mapping(d, gsi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	 * *irq == 0 means no mapping, that should
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	 * be reported as a failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	return (*irq > 0) ? 0 : -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42)  * acpi_register_gsi() - Map a GSI to a linux IRQ number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43)  * @dev: device for which IRQ has to be mapped
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44)  * @gsi: GSI IRQ number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45)  * @trigger: trigger type of the GSI number to be mapped
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46)  * @polarity: polarity of the GSI to be mapped
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48)  * Returns: a valid linux IRQ number on success
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49)  *          -EINVAL on failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) int acpi_register_gsi(struct device *dev, u32 gsi, int trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		      int polarity)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	struct irq_fwspec fwspec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	if (WARN_ON(!acpi_gsi_domain_id)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		pr_warn("GSI: No registered irqchip, giving up\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	fwspec.fwnode = acpi_gsi_domain_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	fwspec.param[0] = gsi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	fwspec.param[1] = acpi_dev_get_irq_type(trigger, polarity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	fwspec.param_count = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	return irq_create_fwspec_mapping(&fwspec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) EXPORT_SYMBOL_GPL(acpi_register_gsi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71)  * acpi_unregister_gsi() - Free a GSI<->linux IRQ number mapping
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72)  * @gsi: GSI IRQ number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) void acpi_unregister_gsi(u32 gsi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	struct irq_domain *d = irq_find_matching_fwnode(acpi_gsi_domain_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 							DOMAIN_BUS_ANY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	int irq = irq_find_mapping(d, gsi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	irq_dispose_mapping(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85)  * acpi_get_irq_source_fwhandle() - Retrieve fwhandle from IRQ resource source.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86)  * @source: acpi_resource_source to use for the lookup.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88)  * Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89)  * Retrieve the fwhandle of the device referenced by the given IRQ resource
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90)  * source.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92)  * Return:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93)  * The referenced device fwhandle or NULL on failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) static struct fwnode_handle *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) acpi_get_irq_source_fwhandle(const struct acpi_resource_source *source)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	struct fwnode_handle *result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	struct acpi_device *device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	acpi_handle handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	acpi_status status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	if (!source->string_length)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		return acpi_gsi_domain_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	status = acpi_get_handle(NULL, source->string_ptr, &handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	if (WARN_ON(ACPI_FAILURE(status)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	device = acpi_bus_get_acpi_device(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	if (WARN_ON(!device))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	result = &device->fwnode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	acpi_bus_put_acpi_device(device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	return result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)  * Context for the resource walk used to lookup IRQ resources.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)  * Contains a return code, the lookup index, and references to the flags
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)  * and fwspec where the result is returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) struct acpi_irq_parse_one_ctx {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	unsigned int index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	unsigned long *res_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	struct irq_fwspec *fwspec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)  * acpi_irq_parse_one_match - Handle a matching IRQ resource.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)  * @fwnode: matching fwnode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)  * @hwirq: hardware IRQ number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)  * @triggering: triggering attributes of hwirq
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)  * @polarity: polarity attributes of hwirq
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)  * @polarity: polarity attributes of hwirq
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)  * @shareable: shareable attributes of hwirq
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)  * @ctx: acpi_irq_parse_one_ctx updated by this function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)  * Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)  * Handle a matching IRQ resource by populating the given ctx with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)  * the information passed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) static inline void acpi_irq_parse_one_match(struct fwnode_handle *fwnode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 					    u32 hwirq, u8 triggering,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 					    u8 polarity, u8 shareable,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 					    struct acpi_irq_parse_one_ctx *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	if (!fwnode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	ctx->rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	*ctx->res_flags = acpi_dev_irq_flags(triggering, polarity, shareable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	ctx->fwspec->fwnode = fwnode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	ctx->fwspec->param[0] = hwirq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	ctx->fwspec->param[1] = acpi_dev_get_irq_type(triggering, polarity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	ctx->fwspec->param_count = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)  * acpi_irq_parse_one_cb - Handle the given resource.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)  * @ares: resource to handle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)  * @context: context for the walk
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)  * Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)  * This is called by acpi_walk_resources passing each resource returned by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)  * the _CRS method. We only inspect IRQ resources. Since IRQ resources
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)  * might contain multiple interrupts we check if the index is within this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)  * one's interrupt array, otherwise we subtract the current resource IRQ
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)  * count from the lookup index to prepare for the next resource.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)  * Once a match is found we call acpi_irq_parse_one_match to populate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)  * the result and end the walk by returning AE_CTRL_TERMINATE.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)  * Return:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)  * AE_OK if the walk should continue, AE_CTRL_TERMINATE if a matching
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)  * IRQ resource was found.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) static acpi_status acpi_irq_parse_one_cb(struct acpi_resource *ares,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 					 void *context)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	struct acpi_irq_parse_one_ctx *ctx = context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	struct acpi_resource_irq *irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	struct acpi_resource_extended_irq *eirq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	struct fwnode_handle *fwnode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	switch (ares->type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	case ACPI_RESOURCE_TYPE_IRQ:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		irq = &ares->data.irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		if (ctx->index >= irq->interrupt_count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 			ctx->index -= irq->interrupt_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 			return AE_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		fwnode = acpi_gsi_domain_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		acpi_irq_parse_one_match(fwnode, irq->interrupts[ctx->index],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 					 irq->triggering, irq->polarity,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 					 irq->shareable, ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		return AE_CTRL_TERMINATE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		eirq = &ares->data.extended_irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		if (eirq->producer_consumer == ACPI_PRODUCER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 			return AE_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		if (ctx->index >= eirq->interrupt_count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 			ctx->index -= eirq->interrupt_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 			return AE_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		fwnode = acpi_get_irq_source_fwhandle(&eirq->resource_source);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		acpi_irq_parse_one_match(fwnode, eirq->interrupts[ctx->index],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 					 eirq->triggering, eirq->polarity,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 					 eirq->shareable, ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		return AE_CTRL_TERMINATE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	return AE_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)  * acpi_irq_parse_one - Resolve an interrupt for a device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)  * @handle: the device whose interrupt is to be resolved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)  * @index: index of the interrupt to resolve
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)  * @fwspec: structure irq_fwspec filled by this function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)  * @flags: resource flags filled by this function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)  * Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)  * Resolves an interrupt for a device by walking its CRS resources to find
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)  * the appropriate ACPI IRQ resource and populating the given struct irq_fwspec
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)  * and flags.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)  * Return:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)  * The result stored in ctx.rc by the callback, or the default -EINVAL value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)  * if an error occurs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) static int acpi_irq_parse_one(acpi_handle handle, unsigned int index,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 			      struct irq_fwspec *fwspec, unsigned long *flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	struct acpi_irq_parse_one_ctx ctx = { -EINVAL, index, flags, fwspec };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	acpi_walk_resources(handle, METHOD_NAME__CRS, acpi_irq_parse_one_cb, &ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	return ctx.rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)  * acpi_irq_get - Lookup an ACPI IRQ resource and use it to initialize resource.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)  * @handle: ACPI device handle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)  * @index:  ACPI IRQ resource index to lookup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)  * @res:    Linux IRQ resource to initialize
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)  * Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)  * Look for the ACPI IRQ resource with the given index and use it to initialize
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)  * the given Linux IRQ resource.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)  * Return:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)  * 0 on success
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)  * -EINVAL if an error occurs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)  * -EPROBE_DEFER if the IRQ lookup/conversion failed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) int acpi_irq_get(acpi_handle handle, unsigned int index, struct resource *res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	struct irq_fwspec fwspec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	struct irq_domain *domain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	rc = acpi_irq_parse_one(handle, index, &fwspec, &flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	domain = irq_find_matching_fwnode(fwspec.fwnode, DOMAIN_BUS_ANY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	if (!domain)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		return -EPROBE_DEFER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	rc = irq_create_fwspec_mapping(&fwspec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	if (rc <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	res->start = rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	res->end = rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	res->flags = flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) EXPORT_SYMBOL_GPL(acpi_irq_get);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)  * acpi_set_irq_model - Setup the GSI irqdomain information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)  * @model: the value assigned to acpi_irq_model
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)  * @fwnode: the irq_domain identifier for mapping and looking up
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)  *          GSI interrupts
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) void __init acpi_set_irq_model(enum acpi_irq_model_id model,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 			       struct fwnode_handle *fwnode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	acpi_irq_model = model;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	acpi_gsi_domain_id = fwnode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)  * acpi_irq_create_hierarchy - Create a hierarchical IRQ domain with the default
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)  *                             GSI domain as its parent.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)  * @flags:      Irq domain flags associated with the domain
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)  * @size:       Size of the domain.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)  * @fwnode:     Optional fwnode of the interrupt controller
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)  * @ops:        Pointer to the interrupt domain callbacks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)  * @host_data:  Controller private data pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) struct irq_domain *acpi_irq_create_hierarchy(unsigned int flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 					     unsigned int size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 					     struct fwnode_handle *fwnode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 					     const struct irq_domain_ops *ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 					     void *host_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	struct irq_domain *d = irq_find_matching_fwnode(acpi_gsi_domain_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 							DOMAIN_BUS_ANY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	if (!d)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	return irq_domain_create_hierarchy(d, flags, size, fwnode, ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 					   host_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) EXPORT_SYMBOL_GPL(acpi_irq_create_hierarchy);