| /* |
| * drivers/acpi/resource.c - ACPI device resources interpretation. |
| * |
| * Copyright (C) 2012, Intel Corp. |
| * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
| * |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as published |
| * by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
| * |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| */ |
| |
| #include <linux/acpi.h> |
| #include <linux/device.h> |
| #include <linux/export.h> |
| #include <linux/ioport.h> |
| |
| #ifdef CONFIG_X86 |
| #define valid_IRQ(i) (((i) != 0) && ((i) != 2)) |
| #else |
| #define valid_IRQ(i) (true) |
| #endif |
| |
| static unsigned long acpi_dev_memresource_flags(u64 len, u8 write_protect, |
| bool window) |
| { |
| unsigned long flags = IORESOURCE_MEM; |
| |
| if (len == 0) |
| flags |= IORESOURCE_DISABLED; |
| |
| if (write_protect == ACPI_READ_WRITE_MEMORY) |
| flags |= IORESOURCE_MEM_WRITEABLE; |
| |
| if (window) |
| flags |= IORESOURCE_WINDOW; |
| |
| return flags; |
| } |
| |
| static void acpi_dev_get_memresource(struct resource *res, u64 start, u64 len, |
| u8 write_protect) |
| { |
| res->start = start; |
| res->end = start + len - 1; |
| res->flags = acpi_dev_memresource_flags(len, write_protect, false); |
| } |
| |
| /** |
| * acpi_dev_resource_memory - Extract ACPI memory resource information. |
| * @ares: Input ACPI resource object. |
| * @res: Output generic resource object. |
| * |
| * Check if the given ACPI resource object represents a memory resource and |
| * if that's the case, use the information in it to populate the generic |
| * resource object pointed to by @res. |
| */ |
| bool acpi_dev_resource_memory(struct acpi_resource *ares, struct resource *res) |
| { |
| struct acpi_resource_memory24 *memory24; |
| struct acpi_resource_memory32 *memory32; |
| struct acpi_resource_fixed_memory32 *fixed_memory32; |
| |
| switch (ares->type) { |
| case ACPI_RESOURCE_TYPE_MEMORY24: |
| memory24 = &ares->data.memory24; |
| acpi_dev_get_memresource(res, memory24->minimum, |
| memory24->address_length, |
| memory24->write_protect); |
| break; |
| case ACPI_RESOURCE_TYPE_MEMORY32: |
| memory32 = &ares->data.memory32; |
| acpi_dev_get_memresource(res, memory32->minimum, |
| memory32->address_length, |
| memory32->write_protect); |
| break; |
| case ACPI_RESOURCE_TYPE_FIXED_MEMORY32: |
| fixed_memory32 = &ares->data.fixed_memory32; |
| acpi_dev_get_memresource(res, fixed_memory32->address, |
| fixed_memory32->address_length, |
| fixed_memory32->write_protect); |
| break; |
| default: |
| return false; |
| } |
| return true; |
| } |
| EXPORT_SYMBOL_GPL(acpi_dev_resource_memory); |
| |
| static unsigned int acpi_dev_ioresource_flags(u64 start, u64 end, u8 io_decode, |
| bool window) |
| { |
| int flags = IORESOURCE_IO; |
| |
| if (io_decode == ACPI_DECODE_16) |
| flags |= IORESOURCE_IO_16BIT_ADDR; |
| |
| if (start > end || end >= 0x10003) |
| flags |= IORESOURCE_DISABLED; |
| |
| if (window) |
| flags |= IORESOURCE_WINDOW; |
| |
| return flags; |
| } |
| |
| static void acpi_dev_get_ioresource(struct resource *res, u64 start, u64 len, |
| u8 io_decode) |
| { |
| u64 end = start + len - 1; |
| |
| res->start = start; |
| res->end = end; |
| res->flags = acpi_dev_ioresource_flags(start, end, io_decode, false); |
| } |
| |
| /** |
| * acpi_dev_resource_io - Extract ACPI I/O resource information. |
| * @ares: Input ACPI resource object. |
| * @res: Output generic resource object. |
| * |
| * Check if the given ACPI resource object represents an I/O resource and |
| * if that's the case, use the information in it to populate the generic |
| * resource object pointed to by @res. |
| */ |
| bool acpi_dev_resource_io(struct acpi_resource *ares, struct resource *res) |
| { |
| struct acpi_resource_io *io; |
| struct acpi_resource_fixed_io *fixed_io; |
| |
| switch (ares->type) { |
| case ACPI_RESOURCE_TYPE_IO: |
| io = &ares->data.io; |
| acpi_dev_get_ioresource(res, io->minimum, |
| io->address_length, |
| io->io_decode); |
| break; |
| case ACPI_RESOURCE_TYPE_FIXED_IO: |
| fixed_io = &ares->data.fixed_io; |
| acpi_dev_get_ioresource(res, fixed_io->address, |
| fixed_io->address_length, |
| ACPI_DECODE_10); |
| break; |
| default: |
| return false; |
| } |
| return true; |
| } |
| EXPORT_SYMBOL_GPL(acpi_dev_resource_io); |
| |
| /** |
| * acpi_dev_resource_address_space - Extract ACPI address space information. |
| * @ares: Input ACPI resource object. |
| * @res: Output generic resource object. |
| * |
| * Check if the given ACPI resource object represents an address space resource |
| * and if that's the case, use the information in it to populate the generic |
| * resource object pointed to by @res. |
| */ |
| bool acpi_dev_resource_address_space(struct acpi_resource *ares, |
| struct resource *res) |
| { |
| acpi_status status; |
| struct acpi_resource_address64 addr; |
| bool window; |
| u64 len; |
| u8 io_decode; |
| |
| switch (ares->type) { |
| case ACPI_RESOURCE_TYPE_ADDRESS16: |
| case ACPI_RESOURCE_TYPE_ADDRESS32: |
| case ACPI_RESOURCE_TYPE_ADDRESS64: |
| break; |
| default: |
| return false; |
| } |
| |
| status = acpi_resource_to_address64(ares, &addr); |
| if (ACPI_FAILURE(status)) |
| return true; |
| |
| res->start = addr.minimum; |
| res->end = addr.maximum; |
| window = addr.producer_consumer == ACPI_PRODUCER; |
| |
| switch(addr.resource_type) { |
| case ACPI_MEMORY_RANGE: |
| len = addr.maximum - addr.minimum + 1; |
| res->flags = acpi_dev_memresource_flags(len, |
| addr.info.mem.write_protect, |
| window); |
| break; |
| case ACPI_IO_RANGE: |
| io_decode = addr.granularity == 0xfff ? |
| ACPI_DECODE_10 : ACPI_DECODE_16; |
| res->flags = acpi_dev_ioresource_flags(addr.minimum, |
| addr.maximum, |
| io_decode, window); |
| break; |
| case ACPI_BUS_NUMBER_RANGE: |
| res->flags = IORESOURCE_BUS; |
| break; |
| default: |
| res->flags = 0; |
| } |
| |
| return true; |
| } |
| EXPORT_SYMBOL_GPL(acpi_dev_resource_address_space); |
| |
| /** |
| * acpi_dev_resource_ext_address_space - Extract ACPI address space information. |
| * @ares: Input ACPI resource object. |
| * @res: Output generic resource object. |
| * |
| * Check if the given ACPI resource object represents an extended address space |
| * resource and if that's the case, use the information in it to populate the |
| * generic resource object pointed to by @res. |
| */ |
| bool acpi_dev_resource_ext_address_space(struct acpi_resource *ares, |
| struct resource *res) |
| { |
| struct acpi_resource_extended_address64 *ext_addr; |
| bool window; |
| u64 len; |
| u8 io_decode; |
| |
| if (ares->type != ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64) |
| return false; |
| |
| ext_addr = &ares->data.ext_address64; |
| |
| res->start = ext_addr->minimum; |
| res->end = ext_addr->maximum; |
| window = ext_addr->producer_consumer == ACPI_PRODUCER; |
| |
| switch(ext_addr->resource_type) { |
| case ACPI_MEMORY_RANGE: |
| len = ext_addr->maximum - ext_addr->minimum + 1; |
| res->flags = acpi_dev_memresource_flags(len, |
| ext_addr->info.mem.write_protect, |
| window); |
| break; |
| case ACPI_IO_RANGE: |
| io_decode = ext_addr->granularity == 0xfff ? |
| ACPI_DECODE_10 : ACPI_DECODE_16; |
| res->flags = acpi_dev_ioresource_flags(ext_addr->minimum, |
| ext_addr->maximum, |
| io_decode, window); |
| break; |
| case ACPI_BUS_NUMBER_RANGE: |
| res->flags = IORESOURCE_BUS; |
| break; |
| default: |
| res->flags = 0; |
| } |
| |
| return true; |
| } |
| EXPORT_SYMBOL_GPL(acpi_dev_resource_ext_address_space); |
| |
| /** |
| * acpi_dev_irq_flags - Determine IRQ resource flags. |
| * @triggering: Triggering type as provided by ACPI. |
| * @polarity: Interrupt polarity as provided by ACPI. |
| * @shareable: Whether or not the interrupt is shareable. |
| */ |
| unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable) |
| { |
| unsigned long flags; |
| |
| if (triggering == ACPI_LEVEL_SENSITIVE) |
| flags = polarity == ACPI_ACTIVE_LOW ? |
| IORESOURCE_IRQ_LOWLEVEL : IORESOURCE_IRQ_HIGHLEVEL; |
| else |
| flags = polarity == ACPI_ACTIVE_LOW ? |
| IORESOURCE_IRQ_LOWEDGE : IORESOURCE_IRQ_HIGHEDGE; |
| |
| if (shareable == ACPI_SHARED) |
| flags |= IORESOURCE_IRQ_SHAREABLE; |
| |
| return flags | IORESOURCE_IRQ; |
| } |
| EXPORT_SYMBOL_GPL(acpi_dev_irq_flags); |
| |
| static void acpi_dev_irqresource_disabled(struct resource *res, u32 gsi) |
| { |
| res->start = gsi; |
| res->end = gsi; |
| res->flags = IORESOURCE_IRQ | IORESOURCE_DISABLED; |
| } |
| |
| static void acpi_dev_get_irqresource(struct resource *res, u32 gsi, |
| u8 triggering, u8 polarity, u8 shareable) |
| { |
| int irq, p, t; |
| |
| if (!valid_IRQ(gsi)) { |
| acpi_dev_irqresource_disabled(res, gsi); |
| return; |
| } |
| |
| /* |
| * In IO-APIC mode, use overrided attribute. Two reasons: |
| * 1. BIOS bug in DSDT |
| * 2. BIOS uses IO-APIC mode Interrupt Source Override |
| */ |
| if (!acpi_get_override_irq(gsi, &t, &p)) { |
| u8 trig = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE; |
| u8 pol = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH; |
| |
| if (triggering != trig || polarity != pol) { |
| pr_warning("ACPI: IRQ %d override to %s, %s\n", gsi, |
| t ? "edge" : "level", p ? "low" : "high"); |
| triggering = trig; |
| polarity = pol; |
| } |
| } |
| |
| res->flags = acpi_dev_irq_flags(triggering, polarity, shareable); |
| irq = acpi_register_gsi(NULL, gsi, triggering, polarity); |
| if (irq >= 0) { |
| res->start = irq; |
| res->end = irq; |
| } else { |
| acpi_dev_irqresource_disabled(res, gsi); |
| } |
| } |
| |
| /** |
| * acpi_dev_resource_interrupt - Extract ACPI interrupt resource information. |
| * @ares: Input ACPI resource object. |
| * @index: Index into the array of GSIs represented by the resource. |
| * @res: Output generic resource object. |
| * |
| * Check if the given ACPI resource object represents an interrupt resource |
| * and @index does not exceed the resource's interrupt count (true is returned |
| * in that case regardless of the results of the other checks)). If that's the |
| * case, register the GSI corresponding to @index from the array of interrupts |
| * represented by the resource and populate the generic resource object pointed |
| * to by @res accordingly. If the registration of the GSI is not successful, |
| * IORESOURCE_DISABLED will be set it that object's flags. |
| */ |
| bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index, |
| struct resource *res) |
| { |
| struct acpi_resource_irq *irq; |
| struct acpi_resource_extended_irq *ext_irq; |
| |
| switch (ares->type) { |
| case ACPI_RESOURCE_TYPE_IRQ: |
| /* |
| * Per spec, only one interrupt per descriptor is allowed in |
| * _CRS, but some firmware violates this, so parse them all. |
| */ |
| irq = &ares->data.irq; |
| if (index >= irq->interrupt_count) { |
| acpi_dev_irqresource_disabled(res, 0); |
| return false; |
| } |
| acpi_dev_get_irqresource(res, irq->interrupts[index], |
| irq->triggering, irq->polarity, |
| irq->sharable); |
| break; |
| case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
| ext_irq = &ares->data.extended_irq; |
| if (index >= ext_irq->interrupt_count) { |
| acpi_dev_irqresource_disabled(res, 0); |
| return false; |
| } |
| acpi_dev_get_irqresource(res, ext_irq->interrupts[index], |
| ext_irq->triggering, ext_irq->polarity, |
| ext_irq->sharable); |
| break; |
| default: |
| return false; |
| } |
| |
| return true; |
| } |
| EXPORT_SYMBOL_GPL(acpi_dev_resource_interrupt); |