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/*
* 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>
#include <linux/slab.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;
if (!memory24->minimum && !memory24->address_length)
return false;
acpi_dev_get_memresource(res, memory24->minimum,
memory24->address_length,
memory24->write_protect);
break;
case ACPI_RESOURCE_TYPE_MEMORY32:
memory32 = &ares->data.memory32;
if (!memory32->minimum && !memory32->address_length)
return false;
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;
if (!fixed_memory32->address && !fixed_memory32->address_length)
return false;
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;
if (!io->minimum && !io->address_length)
return false;
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;
if (!fixed_io->address && !fixed_io->address_length)
return false;
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 false;
res->start = addr.address.minimum;
res->end = addr.address.maximum;
window = addr.producer_consumer == ACPI_PRODUCER;
switch(addr.resource_type) {
case ACPI_MEMORY_RANGE:
len = addr.address.maximum - addr.address.minimum + 1;
res->flags = acpi_dev_memresource_flags(len,
addr.info.mem.write_protect,
window);
break;
case ACPI_IO_RANGE:
io_decode = addr.address.granularity == 0xfff ?
ACPI_DECODE_10 : ACPI_DECODE_16;
res->flags = acpi_dev_ioresource_flags(addr.address.minimum,
addr.address.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->address.minimum;
res->end = ext_addr->address.maximum;
window = ext_addr->producer_consumer == ACPI_PRODUCER;
switch(ext_addr->resource_type) {
case ACPI_MEMORY_RANGE:
len = ext_addr->address.maximum - ext_addr->address.minimum + 1;
res->flags = acpi_dev_memresource_flags(
|