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769 lines
23 KiB
769 lines
23 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* drivers/acpi/resource.c - ACPI device resources interpretation. |
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* |
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* Copyright (C) 2012, Intel Corp. |
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* Author: Rafael J. Wysocki <[email protected]> |
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* |
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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* |
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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*/ |
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|
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#include <linux/acpi.h> |
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#include <linux/device.h> |
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#include <linux/export.h> |
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#include <linux/ioport.h> |
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#include <linux/slab.h> |
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#include <linux/irq.h> |
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|
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#ifdef CONFIG_X86 |
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#define valid_IRQ(i) (((i) != 0) && ((i) != 2)) |
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static inline bool acpi_iospace_resource_valid(struct resource *res) |
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{ |
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/* On X86 IO space is limited to the [0 - 64K] IO port range */ |
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return res->end < 0x10003; |
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} |
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#else |
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#define valid_IRQ(i) (true) |
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/* |
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* ACPI IO descriptors on arches other than X86 contain MMIO CPU physical |
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* addresses mapping IO space in CPU physical address space, IO space |
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* resources can be placed anywhere in the 64-bit physical address space. |
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*/ |
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static inline bool |
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acpi_iospace_resource_valid(struct resource *res) { return true; } |
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#endif |
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|
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#if IS_ENABLED(CONFIG_ACPI_GENERIC_GSI) |
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static inline bool is_gsi(struct acpi_resource_extended_irq *ext_irq) |
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{ |
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return ext_irq->resource_source.string_length == 0 && |
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ext_irq->producer_consumer == ACPI_CONSUMER; |
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} |
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#else |
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static inline bool is_gsi(struct acpi_resource_extended_irq *ext_irq) |
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{ |
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return true; |
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} |
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#endif |
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|
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static bool acpi_dev_resource_len_valid(u64 start, u64 end, u64 len, bool io) |
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{ |
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u64 reslen = end - start + 1; |
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|
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/* |
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* CHECKME: len might be required to check versus a minimum |
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* length as well. 1 for io is fine, but for memory it does |
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* not make any sense at all. |
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* Note: some BIOSes report incorrect length for ACPI address space |
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* descriptor, so remove check of 'reslen == len' to avoid regression. |
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*/ |
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if (len && reslen && start <= end) |
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return true; |
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|
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pr_debug("ACPI: invalid or unassigned resource %s [%016llx - %016llx] length [%016llx]\n", |
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io ? "io" : "mem", start, end, len); |
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|
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return false; |
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} |
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|
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static void acpi_dev_memresource_flags(struct resource *res, u64 len, |
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u8 write_protect) |
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{ |
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res->flags = IORESOURCE_MEM; |
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|
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if (!acpi_dev_resource_len_valid(res->start, res->end, len, false)) |
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res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET; |
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|
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if (write_protect == ACPI_READ_WRITE_MEMORY) |
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res->flags |= IORESOURCE_MEM_WRITEABLE; |
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} |
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|
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static void acpi_dev_get_memresource(struct resource *res, u64 start, u64 len, |
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u8 write_protect) |
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{ |
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res->start = start; |
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res->end = start + len - 1; |
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acpi_dev_memresource_flags(res, len, write_protect); |
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} |
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|
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/** |
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* acpi_dev_resource_memory - Extract ACPI memory resource information. |
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* @ares: Input ACPI resource object. |
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* @res: Output generic resource object. |
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* |
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* Check if the given ACPI resource object represents a memory resource and |
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* if that's the case, use the information in it to populate the generic |
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* resource object pointed to by @res. |
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* |
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* Return: |
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* 1) false with res->flags setting to zero: not the expected resource type |
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* 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource |
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* 3) true: valid assigned resource |
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*/ |
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bool acpi_dev_resource_memory(struct acpi_resource *ares, struct resource *res) |
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{ |
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struct acpi_resource_memory24 *memory24; |
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struct acpi_resource_memory32 *memory32; |
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struct acpi_resource_fixed_memory32 *fixed_memory32; |
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|
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switch (ares->type) { |
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case ACPI_RESOURCE_TYPE_MEMORY24: |
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memory24 = &ares->data.memory24; |
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acpi_dev_get_memresource(res, memory24->minimum << 8, |
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memory24->address_length << 8, |
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memory24->write_protect); |
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break; |
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case ACPI_RESOURCE_TYPE_MEMORY32: |
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memory32 = &ares->data.memory32; |
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acpi_dev_get_memresource(res, memory32->minimum, |
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memory32->address_length, |
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memory32->write_protect); |
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break; |
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case ACPI_RESOURCE_TYPE_FIXED_MEMORY32: |
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fixed_memory32 = &ares->data.fixed_memory32; |
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acpi_dev_get_memresource(res, fixed_memory32->address, |
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fixed_memory32->address_length, |
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fixed_memory32->write_protect); |
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break; |
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default: |
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res->flags = 0; |
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return false; |
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} |
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|
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return !(res->flags & IORESOURCE_DISABLED); |
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} |
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EXPORT_SYMBOL_GPL(acpi_dev_resource_memory); |
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|
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static void acpi_dev_ioresource_flags(struct resource *res, u64 len, |
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u8 io_decode, u8 translation_type) |
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{ |
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res->flags = IORESOURCE_IO; |
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|
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if (!acpi_dev_resource_len_valid(res->start, res->end, len, true)) |
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res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET; |
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|
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if (!acpi_iospace_resource_valid(res)) |
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res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET; |
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|
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if (io_decode == ACPI_DECODE_16) |
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res->flags |= IORESOURCE_IO_16BIT_ADDR; |
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if (translation_type == ACPI_SPARSE_TRANSLATION) |
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res->flags |= IORESOURCE_IO_SPARSE; |
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} |
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|
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static void acpi_dev_get_ioresource(struct resource *res, u64 start, u64 len, |
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u8 io_decode) |
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{ |
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res->start = start; |
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res->end = start + len - 1; |
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acpi_dev_ioresource_flags(res, len, io_decode, 0); |
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} |
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|
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/** |
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* acpi_dev_resource_io - Extract ACPI I/O resource information. |
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* @ares: Input ACPI resource object. |
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* @res: Output generic resource object. |
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* |
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* Check if the given ACPI resource object represents an I/O resource and |
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* if that's the case, use the information in it to populate the generic |
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* resource object pointed to by @res. |
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* |
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* Return: |
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* 1) false with res->flags setting to zero: not the expected resource type |
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* 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource |
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* 3) true: valid assigned resource |
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*/ |
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bool acpi_dev_resource_io(struct acpi_resource *ares, struct resource *res) |
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{ |
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struct acpi_resource_io *io; |
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struct acpi_resource_fixed_io *fixed_io; |
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|
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switch (ares->type) { |
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case ACPI_RESOURCE_TYPE_IO: |
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io = &ares->data.io; |
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acpi_dev_get_ioresource(res, io->minimum, |
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io->address_length, |
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io->io_decode); |
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break; |
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case ACPI_RESOURCE_TYPE_FIXED_IO: |
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fixed_io = &ares->data.fixed_io; |
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acpi_dev_get_ioresource(res, fixed_io->address, |
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fixed_io->address_length, |
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ACPI_DECODE_10); |
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break; |
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default: |
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res->flags = 0; |
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return false; |
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} |
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|
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return !(res->flags & IORESOURCE_DISABLED); |
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} |
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EXPORT_SYMBOL_GPL(acpi_dev_resource_io); |
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|
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static bool acpi_decode_space(struct resource_win *win, |
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struct acpi_resource_address *addr, |
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struct acpi_address64_attribute *attr) |
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{ |
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u8 iodec = attr->granularity == 0xfff ? ACPI_DECODE_10 : ACPI_DECODE_16; |
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bool wp = addr->info.mem.write_protect; |
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u64 len = attr->address_length; |
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u64 start, end, offset = 0; |
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struct resource *res = &win->res; |
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|
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/* |
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* Filter out invalid descriptor according to ACPI Spec 5.0, section |
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* 6.4.3.5 Address Space Resource Descriptors. |
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*/ |
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if ((addr->min_address_fixed != addr->max_address_fixed && len) || |
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(addr->min_address_fixed && addr->max_address_fixed && !len)) |
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pr_debug("ACPI: Invalid address space min_addr_fix %d, max_addr_fix %d, len %llx\n", |
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addr->min_address_fixed, addr->max_address_fixed, len); |
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|
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/* |
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* For bridges that translate addresses across the bridge, |
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* translation_offset is the offset that must be added to the |
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* address on the secondary side to obtain the address on the |
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* primary side. Non-bridge devices must list 0 for all Address |
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* Translation offset bits. |
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*/ |
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if (addr->producer_consumer == ACPI_PRODUCER) |
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offset = attr->translation_offset; |
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else if (attr->translation_offset) |
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pr_debug("ACPI: translation_offset(%lld) is invalid for non-bridge device.\n", |
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attr->translation_offset); |
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start = attr->minimum + offset; |
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end = attr->maximum + offset; |
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|
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win->offset = offset; |
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res->start = start; |
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res->end = end; |
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if (sizeof(resource_size_t) < sizeof(u64) && |
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(offset != win->offset || start != res->start || end != res->end)) { |
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pr_warn("acpi resource window ([%#llx-%#llx] ignored, not CPU addressable)\n", |
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attr->minimum, attr->maximum); |
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return false; |
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} |
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|
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switch (addr->resource_type) { |
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case ACPI_MEMORY_RANGE: |
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acpi_dev_memresource_flags(res, len, wp); |
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break; |
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case ACPI_IO_RANGE: |
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acpi_dev_ioresource_flags(res, len, iodec, |
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addr->info.io.translation_type); |
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break; |
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case ACPI_BUS_NUMBER_RANGE: |
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res->flags = IORESOURCE_BUS; |
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break; |
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default: |
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return false; |
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} |
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|
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if (addr->producer_consumer == ACPI_PRODUCER) |
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res->flags |= IORESOURCE_WINDOW; |
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|
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if (addr->info.mem.caching == ACPI_PREFETCHABLE_MEMORY) |
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res->flags |= IORESOURCE_PREFETCH; |
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|
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return !(res->flags & IORESOURCE_DISABLED); |
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} |
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|
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/** |
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* acpi_dev_resource_address_space - Extract ACPI address space information. |
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* @ares: Input ACPI resource object. |
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* @win: Output generic resource object. |
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* |
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* Check if the given ACPI resource object represents an address space resource |
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* and if that's the case, use the information in it to populate the generic |
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* resource object pointed to by @win. |
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* |
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* Return: |
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* 1) false with win->res.flags setting to zero: not the expected resource type |
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* 2) false with IORESOURCE_DISABLED in win->res.flags: valid unassigned |
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* resource |
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* 3) true: valid assigned resource |
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*/ |
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bool acpi_dev_resource_address_space(struct acpi_resource *ares, |
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struct resource_win *win) |
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{ |
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struct acpi_resource_address64 addr; |
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|
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win->res.flags = 0; |
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if (ACPI_FAILURE(acpi_resource_to_address64(ares, &addr))) |
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return false; |
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|
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return acpi_decode_space(win, (struct acpi_resource_address *)&addr, |
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&addr.address); |
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} |
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EXPORT_SYMBOL_GPL(acpi_dev_resource_address_space); |
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|
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/** |
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* acpi_dev_resource_ext_address_space - Extract ACPI address space information. |
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* @ares: Input ACPI resource object. |
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* @win: Output generic resource object. |
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* |
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* Check if the given ACPI resource object represents an extended address space |
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* resource and if that's the case, use the information in it to populate the |
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* generic resource object pointed to by @win. |
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* |
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* Return: |
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* 1) false with win->res.flags setting to zero: not the expected resource type |
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* 2) false with IORESOURCE_DISABLED in win->res.flags: valid unassigned |
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* resource |
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* 3) true: valid assigned resource |
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*/ |
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bool acpi_dev_resource_ext_address_space(struct acpi_resource *ares, |
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struct resource_win *win) |
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{ |
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struct acpi_resource_extended_address64 *ext_addr; |
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|
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win->res.flags = 0; |
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if (ares->type != ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64) |
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return false; |
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ext_addr = &ares->data.ext_address64; |
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|
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return acpi_decode_space(win, (struct acpi_resource_address *)ext_addr, |
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&ext_addr->address); |
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} |
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EXPORT_SYMBOL_GPL(acpi_dev_resource_ext_address_space); |
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|
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/** |
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* acpi_dev_irq_flags - Determine IRQ resource flags. |
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* @triggering: Triggering type as provided by ACPI. |
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* @polarity: Interrupt polarity as provided by ACPI. |
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* @shareable: Whether or not the interrupt is shareable. |
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*/ |
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unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable) |
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{ |
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unsigned long flags; |
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|
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if (triggering == ACPI_LEVEL_SENSITIVE) |
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flags = polarity == ACPI_ACTIVE_LOW ? |
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IORESOURCE_IRQ_LOWLEVEL : IORESOURCE_IRQ_HIGHLEVEL; |
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else |
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flags = polarity == ACPI_ACTIVE_LOW ? |
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IORESOURCE_IRQ_LOWEDGE : IORESOURCE_IRQ_HIGHEDGE; |
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|
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if (shareable == ACPI_SHARED) |
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flags |= IORESOURCE_IRQ_SHAREABLE; |
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|
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return flags | IORESOURCE_IRQ; |
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} |
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EXPORT_SYMBOL_GPL(acpi_dev_irq_flags); |
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|
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/** |
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* acpi_dev_get_irq_type - Determine irq type. |
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* @triggering: Triggering type as provided by ACPI. |
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* @polarity: Interrupt polarity as provided by ACPI. |
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*/ |
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unsigned int acpi_dev_get_irq_type(int triggering, int polarity) |
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{ |
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switch (polarity) { |
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case ACPI_ACTIVE_LOW: |
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return triggering == ACPI_EDGE_SENSITIVE ? |
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IRQ_TYPE_EDGE_FALLING : |
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IRQ_TYPE_LEVEL_LOW; |
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case ACPI_ACTIVE_HIGH: |
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return triggering == ACPI_EDGE_SENSITIVE ? |
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IRQ_TYPE_EDGE_RISING : |
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IRQ_TYPE_LEVEL_HIGH; |
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case ACPI_ACTIVE_BOTH: |
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if (triggering == ACPI_EDGE_SENSITIVE) |
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return IRQ_TYPE_EDGE_BOTH; |
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fallthrough; |
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default: |
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return IRQ_TYPE_NONE; |
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} |
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} |
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EXPORT_SYMBOL_GPL(acpi_dev_get_irq_type); |
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|
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static void acpi_dev_get_irqresource(struct resource *res, u32 gsi, |
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u8 triggering, u8 polarity, u8 shareable, |
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bool legacy) |
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{ |
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int irq, p, t; |
|
|
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if (!valid_IRQ(gsi)) { |
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irqresource_disabled(res, gsi); |
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return; |
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} |
|
|
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/* |
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* In IO-APIC mode, use overridden attribute. Two reasons: |
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* 1. BIOS bug in DSDT |
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* 2. BIOS uses IO-APIC mode Interrupt Source Override |
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* |
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* We do this only if we are dealing with IRQ() or IRQNoFlags() |
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* resource (the legacy ISA resources). With modern ACPI 5 devices |
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* using extended IRQ descriptors we take the IRQ configuration |
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* from _CRS directly. |
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*/ |
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if (legacy && !acpi_get_override_irq(gsi, &t, &p)) { |
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u8 trig = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE; |
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u8 pol = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH; |
|
|
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if (triggering != trig || polarity != pol) { |
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pr_warn("ACPI: IRQ %d override to %s, %s\n", gsi, |
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t ? "level" : "edge", p ? "low" : "high"); |
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triggering = trig; |
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polarity = pol; |
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} |
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} |
|
|
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res->flags = acpi_dev_irq_flags(triggering, polarity, shareable); |
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irq = acpi_register_gsi(NULL, gsi, triggering, polarity); |
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if (irq >= 0) { |
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res->start = irq; |
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res->end = irq; |
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} else { |
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irqresource_disabled(res, gsi); |
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} |
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} |
|
|
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/** |
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* acpi_dev_resource_interrupt - Extract ACPI interrupt resource information. |
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* @ares: Input ACPI resource object. |
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* @index: Index into the array of GSIs represented by the resource. |
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* @res: Output generic resource object. |
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* |
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* Check if the given ACPI resource object represents an interrupt resource |
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* and @index does not exceed the resource's interrupt count (true is returned |
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* in that case regardless of the results of the other checks)). If that's the |
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* case, register the GSI corresponding to @index from the array of interrupts |
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* represented by the resource and populate the generic resource object pointed |
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* to by @res accordingly. If the registration of the GSI is not successful, |
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* IORESOURCE_DISABLED will be set it that object's flags. |
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* |
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* Return: |
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* 1) false with res->flags setting to zero: not the expected resource type |
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* 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource |
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* 3) true: valid assigned resource |
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*/ |
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bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index, |
|
struct resource *res) |
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{ |
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struct acpi_resource_irq *irq; |
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struct acpi_resource_extended_irq *ext_irq; |
|
|
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switch (ares->type) { |
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case ACPI_RESOURCE_TYPE_IRQ: |
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/* |
|
* Per spec, only one interrupt per descriptor is allowed in |
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* _CRS, but some firmware violates this, so parse them all. |
|
*/ |
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irq = &ares->data.irq; |
|
if (index >= irq->interrupt_count) { |
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irqresource_disabled(res, 0); |
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return false; |
|
} |
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acpi_dev_get_irqresource(res, irq->interrupts[index], |
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irq->triggering, irq->polarity, |
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irq->shareable, true); |
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break; |
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case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
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ext_irq = &ares->data.extended_irq; |
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if (index >= ext_irq->interrupt_count) { |
|
irqresource_disabled(res, 0); |
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return false; |
|
} |
|
if (is_gsi(ext_irq)) |
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acpi_dev_get_irqresource(res, ext_irq->interrupts[index], |
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ext_irq->triggering, ext_irq->polarity, |
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ext_irq->shareable, false); |
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else |
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irqresource_disabled(res, 0); |
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break; |
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default: |
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res->flags = 0; |
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return false; |
|
} |
|
|
|
return true; |
|
} |
|
EXPORT_SYMBOL_GPL(acpi_dev_resource_interrupt); |
|
|
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/** |
|
* acpi_dev_free_resource_list - Free resource from %acpi_dev_get_resources(). |
|
* @list: The head of the resource list to free. |
|
*/ |
|
void acpi_dev_free_resource_list(struct list_head *list) |
|
{ |
|
resource_list_free(list); |
|
} |
|
EXPORT_SYMBOL_GPL(acpi_dev_free_resource_list); |
|
|
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struct res_proc_context { |
|
struct list_head *list; |
|
int (*preproc)(struct acpi_resource *, void *); |
|
void *preproc_data; |
|
int count; |
|
int error; |
|
}; |
|
|
|
static acpi_status acpi_dev_new_resource_entry(struct resource_win *win, |
|
struct res_proc_context *c) |
|
{ |
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struct resource_entry *rentry; |
|
|
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rentry = resource_list_create_entry(NULL, 0); |
|
if (!rentry) { |
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c->error = -ENOMEM; |
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return AE_NO_MEMORY; |
|
} |
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*rentry->res = win->res; |
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rentry->offset = win->offset; |
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resource_list_add_tail(rentry, c->list); |
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c->count++; |
|
return AE_OK; |
|
} |
|
|
|
static acpi_status acpi_dev_process_resource(struct acpi_resource *ares, |
|
void *context) |
|
{ |
|
struct res_proc_context *c = context; |
|
struct resource_win win; |
|
struct resource *res = &win.res; |
|
int i; |
|
|
|
if (c->preproc) { |
|
int ret; |
|
|
|
ret = c->preproc(ares, c->preproc_data); |
|
if (ret < 0) { |
|
c->error = ret; |
|
return AE_ABORT_METHOD; |
|
} else if (ret > 0) { |
|
return AE_OK; |
|
} |
|
} |
|
|
|
memset(&win, 0, sizeof(win)); |
|
|
|
if (acpi_dev_resource_memory(ares, res) |
|
|| acpi_dev_resource_io(ares, res) |
|
|| acpi_dev_resource_address_space(ares, &win) |
|
|| acpi_dev_resource_ext_address_space(ares, &win)) |
|
return acpi_dev_new_resource_entry(&win, c); |
|
|
|
for (i = 0; acpi_dev_resource_interrupt(ares, i, res); i++) { |
|
acpi_status status; |
|
|
|
status = acpi_dev_new_resource_entry(&win, c); |
|
if (ACPI_FAILURE(status)) |
|
return status; |
|
} |
|
|
|
return AE_OK; |
|
} |
|
|
|
static int __acpi_dev_get_resources(struct acpi_device *adev, |
|
struct list_head *list, |
|
int (*preproc)(struct acpi_resource *, void *), |
|
void *preproc_data, char *method) |
|
{ |
|
struct res_proc_context c; |
|
acpi_status status; |
|
|
|
if (!adev || !adev->handle || !list_empty(list)) |
|
return -EINVAL; |
|
|
|
if (!acpi_has_method(adev->handle, method)) |
|
return 0; |
|
|
|
c.list = list; |
|
c.preproc = preproc; |
|
c.preproc_data = preproc_data; |
|
c.count = 0; |
|
c.error = 0; |
|
status = acpi_walk_resources(adev->handle, method, |
|
acpi_dev_process_resource, &c); |
|
if (ACPI_FAILURE(status)) { |
|
acpi_dev_free_resource_list(list); |
|
return c.error ? c.error : -EIO; |
|
} |
|
|
|
return c.count; |
|
} |
|
|
|
/** |
|
* acpi_dev_get_resources - Get current resources of a device. |
|
* @adev: ACPI device node to get the resources for. |
|
* @list: Head of the resultant list of resources (must be empty). |
|
* @preproc: The caller's preprocessing routine. |
|
* @preproc_data: Pointer passed to the caller's preprocessing routine. |
|
* |
|
* Evaluate the _CRS method for the given device node and process its output by |
|
* (1) executing the @preproc() rountine provided by the caller, passing the |
|
* resource pointer and @preproc_data to it as arguments, for each ACPI resource |
|
* returned and (2) converting all of the returned ACPI resources into struct |
|
* resource objects if possible. If the return value of @preproc() in step (1) |
|
* is different from 0, step (2) is not applied to the given ACPI resource and |
|
* if that value is negative, the whole processing is aborted and that value is |
|
* returned as the final error code. |
|
* |
|
* The resultant struct resource objects are put on the list pointed to by |
|
* @list, that must be empty initially, as members of struct resource_entry |
|
* objects. Callers of this routine should use %acpi_dev_free_resource_list() to |
|
* free that list. |
|
* |
|
* The number of resources in the output list is returned on success, an error |
|
* code reflecting the error condition is returned otherwise. |
|
*/ |
|
int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list, |
|
int (*preproc)(struct acpi_resource *, void *), |
|
void *preproc_data) |
|
{ |
|
return __acpi_dev_get_resources(adev, list, preproc, preproc_data, |
|
METHOD_NAME__CRS); |
|
} |
|
EXPORT_SYMBOL_GPL(acpi_dev_get_resources); |
|
|
|
static int is_memory(struct acpi_resource *ares, void *not_used) |
|
{ |
|
struct resource_win win; |
|
struct resource *res = &win.res; |
|
|
|
memset(&win, 0, sizeof(win)); |
|
|
|
return !(acpi_dev_resource_memory(ares, res) |
|
|| acpi_dev_resource_address_space(ares, &win) |
|
|| acpi_dev_resource_ext_address_space(ares, &win)); |
|
} |
|
|
|
/** |
|
* acpi_dev_get_dma_resources - Get current DMA resources of a device. |
|
* @adev: ACPI device node to get the resources for. |
|
* @list: Head of the resultant list of resources (must be empty). |
|
* |
|
* Evaluate the _DMA method for the given device node and process its |
|
* output. |
|
* |
|
* The resultant struct resource objects are put on the list pointed to |
|
* by @list, that must be empty initially, as members of struct |
|
* resource_entry objects. Callers of this routine should use |
|
* %acpi_dev_free_resource_list() to free that list. |
|
* |
|
* The number of resources in the output list is returned on success, |
|
* an error code reflecting the error condition is returned otherwise. |
|
*/ |
|
int acpi_dev_get_dma_resources(struct acpi_device *adev, struct list_head *list) |
|
{ |
|
return __acpi_dev_get_resources(adev, list, is_memory, NULL, |
|
METHOD_NAME__DMA); |
|
} |
|
EXPORT_SYMBOL_GPL(acpi_dev_get_dma_resources); |
|
|
|
/** |
|
* acpi_dev_filter_resource_type - Filter ACPI resource according to resource |
|
* types |
|
* @ares: Input ACPI resource object. |
|
* @types: Valid resource types of IORESOURCE_XXX |
|
* |
|
* This is a helper function to support acpi_dev_get_resources(), which filters |
|
* ACPI resource objects according to resource types. |
|
*/ |
|
int acpi_dev_filter_resource_type(struct acpi_resource *ares, |
|
unsigned long types) |
|
{ |
|
unsigned long type = 0; |
|
|
|
switch (ares->type) { |
|
case ACPI_RESOURCE_TYPE_MEMORY24: |
|
case ACPI_RESOURCE_TYPE_MEMORY32: |
|
case ACPI_RESOURCE_TYPE_FIXED_MEMORY32: |
|
type = IORESOURCE_MEM; |
|
break; |
|
case ACPI_RESOURCE_TYPE_IO: |
|
case ACPI_RESOURCE_TYPE_FIXED_IO: |
|
type = IORESOURCE_IO; |
|
break; |
|
case ACPI_RESOURCE_TYPE_IRQ: |
|
case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
|
type = IORESOURCE_IRQ; |
|
break; |
|
case ACPI_RESOURCE_TYPE_DMA: |
|
case ACPI_RESOURCE_TYPE_FIXED_DMA: |
|
type = IORESOURCE_DMA; |
|
break; |
|
case ACPI_RESOURCE_TYPE_GENERIC_REGISTER: |
|
type = IORESOURCE_REG; |
|
break; |
|
case ACPI_RESOURCE_TYPE_ADDRESS16: |
|
case ACPI_RESOURCE_TYPE_ADDRESS32: |
|
case ACPI_RESOURCE_TYPE_ADDRESS64: |
|
case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64: |
|
if (ares->data.address.resource_type == ACPI_MEMORY_RANGE) |
|
type = IORESOURCE_MEM; |
|
else if (ares->data.address.resource_type == ACPI_IO_RANGE) |
|
type = IORESOURCE_IO; |
|
else if (ares->data.address.resource_type == |
|
ACPI_BUS_NUMBER_RANGE) |
|
type = IORESOURCE_BUS; |
|
break; |
|
default: |
|
break; |
|
} |
|
|
|
return (type & types) ? 0 : 1; |
|
} |
|
EXPORT_SYMBOL_GPL(acpi_dev_filter_resource_type); |
|
|
|
static int acpi_dev_consumes_res(struct acpi_device *adev, struct resource *res) |
|
{ |
|
struct list_head resource_list; |
|
struct resource_entry *rentry; |
|
int ret, found = 0; |
|
|
|
INIT_LIST_HEAD(&resource_list); |
|
ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); |
|
if (ret < 0) |
|
return 0; |
|
|
|
list_for_each_entry(rentry, &resource_list, node) { |
|
if (resource_contains(rentry->res, res)) { |
|
found = 1; |
|
break; |
|
} |
|
|
|
} |
|
|
|
acpi_dev_free_resource_list(&resource_list); |
|
return found; |
|
} |
|
|
|
static acpi_status acpi_res_consumer_cb(acpi_handle handle, u32 depth, |
|
void *context, void **ret) |
|
{ |
|
struct resource *res = context; |
|
struct acpi_device **consumer = (struct acpi_device **) ret; |
|
struct acpi_device *adev; |
|
|
|
if (acpi_bus_get_device(handle, &adev)) |
|
return AE_OK; |
|
|
|
if (acpi_dev_consumes_res(adev, res)) { |
|
*consumer = adev; |
|
return AE_CTRL_TERMINATE; |
|
} |
|
|
|
return AE_OK; |
|
} |
|
|
|
/** |
|
* acpi_resource_consumer - Find the ACPI device that consumes @res. |
|
* @res: Resource to search for. |
|
* |
|
* Search the current resource settings (_CRS) of every ACPI device node |
|
* for @res. If we find an ACPI device whose _CRS includes @res, return |
|
* it. Otherwise, return NULL. |
|
*/ |
|
struct acpi_device *acpi_resource_consumer(struct resource *res) |
|
{ |
|
struct acpi_device *consumer = NULL; |
|
|
|
acpi_get_devices(NULL, acpi_res_consumer_cb, res, (void **) &consumer); |
|
return consumer; |
|
}
|
|
|