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remarkable-linux/drivers/acpi/acpica/exregion.c
Lv Zheng bb42cc224a ACPICA: Update default space handlers. 
This patch adds code that is already in ACPICA upstream, so applying
it can help to reduce the source code differences between Linux and
ACPICA upstream.

This code fragment is only useful for ACPICA utilities and no
functional changes to the Linux kernel should result from it.

[rjw: Changelog]
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-10-31 14:37:31 +01:00

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/******************************************************************************
*
* Module Name: exregion - ACPI default op_region (address space) handlers
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2013, Intel Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#include <acpi/acpi.h>
#include "accommon.h"
#include "acinterp.h"
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME("exregion")
/*******************************************************************************
*
* FUNCTION: acpi_ex_system_memory_space_handler
*
* PARAMETERS: function - Read or Write operation
* address - Where in the space to read or write
* bit_width - Field width in bits (8, 16, or 32)
* value - Pointer to in or out value
* handler_context - Pointer to Handler's context
* region_context - Pointer to context specific to the
* accessed region
*
* RETURN: Status
*
* DESCRIPTION: Handler for the System Memory address space (Op Region)
*
******************************************************************************/
acpi_status
acpi_ex_system_memory_space_handler(u32 function,
acpi_physical_address address,
u32 bit_width,
u64 *value,
void *handler_context, void *region_context)
{
acpi_status status = AE_OK;
void *logical_addr_ptr = NULL;
struct acpi_mem_space_context *mem_info = region_context;
u32 length;
acpi_size map_length;
acpi_size page_boundary_map_length;
#ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
u32 remainder;
#endif
ACPI_FUNCTION_TRACE(ex_system_memory_space_handler);
/* Validate and translate the bit width */
switch (bit_width) {
case 8:
length = 1;
break;
case 16:
length = 2;
break;
case 32:
length = 4;
break;
case 64:
length = 8;
break;
default:
ACPI_ERROR((AE_INFO, "Invalid SystemMemory width %u",
bit_width));
return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
}
#ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
/*
* Hardware does not support non-aligned data transfers, we must verify
* the request.
*/
(void)acpi_ut_short_divide((u64) address, length, NULL, &remainder);
if (remainder != 0) {
return_ACPI_STATUS(AE_AML_ALIGNMENT);
}
#endif
/*
* Does the request fit into the cached memory mapping?
* Is 1) Address below the current mapping? OR
* 2) Address beyond the current mapping?
*/
if ((address < mem_info->mapped_physical_address) ||
(((u64) address + length) > ((u64)
mem_info->mapped_physical_address +
mem_info->mapped_length))) {
/*
* The request cannot be resolved by the current memory mapping;
* Delete the existing mapping and create a new one.
*/
if (mem_info->mapped_length) {
/* Valid mapping, delete it */
acpi_os_unmap_memory(mem_info->mapped_logical_address,
mem_info->mapped_length);
}
/*
* October 2009: Attempt to map from the requested address to the
* end of the region. However, we will never map more than one
* page, nor will we cross a page boundary.
*/
map_length = (acpi_size)
((mem_info->address + mem_info->length) - address);
/*
* If mapping the entire remaining portion of the region will cross
* a page boundary, just map up to the page boundary, do not cross.
* On some systems, crossing a page boundary while mapping regions
* can cause warnings if the pages have different attributes
* due to resource management.
*
* This has the added benefit of constraining a single mapping to
* one page, which is similar to the original code that used a 4k
* maximum window.
*/
page_boundary_map_length =
ACPI_ROUND_UP(address, ACPI_DEFAULT_PAGE_SIZE) - address;
if (page_boundary_map_length == 0) {
page_boundary_map_length = ACPI_DEFAULT_PAGE_SIZE;
}
if (map_length > page_boundary_map_length) {
map_length = page_boundary_map_length;
}
/* Create a new mapping starting at the address given */
mem_info->mapped_logical_address = acpi_os_map_memory((acpi_physical_address) address, map_length);
if (!mem_info->mapped_logical_address) {
ACPI_ERROR((AE_INFO,
"Could not map memory at 0x%8.8X%8.8X, size %u",
ACPI_FORMAT_NATIVE_UINT(address),
(u32) map_length));
mem_info->mapped_length = 0;
return_ACPI_STATUS(AE_NO_MEMORY);
}
/* Save the physical address and mapping size */
mem_info->mapped_physical_address = address;
mem_info->mapped_length = map_length;
}
/*
* Generate a logical pointer corresponding to the address we want to
* access
*/
logical_addr_ptr = mem_info->mapped_logical_address +
((u64) address - (u64) mem_info->mapped_physical_address);
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"System-Memory (width %u) R/W %u Address=%8.8X%8.8X\n",
bit_width, function,
ACPI_FORMAT_NATIVE_UINT(address)));
/*
* Perform the memory read or write
*
* Note: For machines that do not support non-aligned transfers, the target
* address was checked for alignment above. We do not attempt to break the
* transfer up into smaller (byte-size) chunks because the AML specifically
* asked for a transfer width that the hardware may require.
*/
switch (function) {
case ACPI_READ:
*value = 0;
switch (bit_width) {
case 8:
*value = (u64)ACPI_GET8(logical_addr_ptr);
break;
case 16:
*value = (u64)ACPI_GET16(logical_addr_ptr);
break;
case 32:
*value = (u64)ACPI_GET32(logical_addr_ptr);
break;
case 64:
*value = (u64)ACPI_GET64(logical_addr_ptr);
break;
default:
/* bit_width was already validated */
break;
}
break;
case ACPI_WRITE:
switch (bit_width) {
case 8:
ACPI_SET8(logical_addr_ptr, *value);
break;
case 16:
ACPI_SET16(logical_addr_ptr, *value);
break;
case 32:
ACPI_SET32(logical_addr_ptr, *value);
break;
case 64:
ACPI_SET64(logical_addr_ptr, *value);
break;
default:
/* bit_width was already validated */
break;
}
break;
default:
status = AE_BAD_PARAMETER;
break;
}
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_system_io_space_handler
*
* PARAMETERS: function - Read or Write operation
* address - Where in the space to read or write
* bit_width - Field width in bits (8, 16, or 32)
* value - Pointer to in or out value
* handler_context - Pointer to Handler's context
* region_context - Pointer to context specific to the
* accessed region
*
* RETURN: Status
*
* DESCRIPTION: Handler for the System IO address space (Op Region)
*
******************************************************************************/
acpi_status
acpi_ex_system_io_space_handler(u32 function,
acpi_physical_address address,
u32 bit_width,
u64 *value,
void *handler_context, void *region_context)
{
acpi_status status = AE_OK;
u32 value32;
ACPI_FUNCTION_TRACE(ex_system_io_space_handler);
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"System-IO (width %u) R/W %u Address=%8.8X%8.8X\n",
bit_width, function,
ACPI_FORMAT_NATIVE_UINT(address)));
/* Decode the function parameter */
switch (function) {
case ACPI_READ:
status = acpi_hw_read_port((acpi_io_address) address,
&value32, bit_width);
*value = value32;
break;
case ACPI_WRITE:
status = acpi_hw_write_port((acpi_io_address) address,
(u32) * value, bit_width);
break;
default:
status = AE_BAD_PARAMETER;
break;
}
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_pci_config_space_handler
*
* PARAMETERS: function - Read or Write operation
* address - Where in the space to read or write
* bit_width - Field width in bits (8, 16, or 32)
* value - Pointer to in or out value
* handler_context - Pointer to Handler's context
* region_context - Pointer to context specific to the
* accessed region
*
* RETURN: Status
*
* DESCRIPTION: Handler for the PCI Config address space (Op Region)
*
******************************************************************************/
acpi_status
acpi_ex_pci_config_space_handler(u32 function,
acpi_physical_address address,
u32 bit_width,
u64 *value,
void *handler_context, void *region_context)
{
acpi_status status = AE_OK;
struct acpi_pci_id *pci_id;
u16 pci_register;
ACPI_FUNCTION_TRACE(ex_pci_config_space_handler);
/*
* The arguments to acpi_os(Read|Write)pci_configuration are:
*
* pci_segment is the PCI bus segment range 0-31
* pci_bus is the PCI bus number range 0-255
* pci_device is the PCI device number range 0-31
* pci_function is the PCI device function number
* pci_register is the Config space register range 0-255 bytes
*
* value - input value for write, output address for read
*
*/
pci_id = (struct acpi_pci_id *)region_context;
pci_register = (u16) (u32) address;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Pci-Config %u (%u) Seg(%04x) Bus(%04x) Dev(%04x) Func(%04x) Reg(%04x)\n",
function, bit_width, pci_id->segment, pci_id->bus,
pci_id->device, pci_id->function, pci_register));
switch (function) {
case ACPI_READ:
*value = 0;
status = acpi_os_read_pci_configuration(pci_id, pci_register,
value, bit_width);
break;
case ACPI_WRITE:
status = acpi_os_write_pci_configuration(pci_id, pci_register,
*value, bit_width);
break;
default:
status = AE_BAD_PARAMETER;
break;
}
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_cmos_space_handler
*
* PARAMETERS: function - Read or Write operation
* address - Where in the space to read or write
* bit_width - Field width in bits (8, 16, or 32)
* value - Pointer to in or out value
* handler_context - Pointer to Handler's context
* region_context - Pointer to context specific to the
* accessed region
*
* RETURN: Status
*
* DESCRIPTION: Handler for the CMOS address space (Op Region)
*
******************************************************************************/
acpi_status
acpi_ex_cmos_space_handler(u32 function,
acpi_physical_address address,
u32 bit_width,
u64 *value,
void *handler_context, void *region_context)
{
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE(ex_cmos_space_handler);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_pci_bar_space_handler
*
* PARAMETERS: function - Read or Write operation
* address - Where in the space to read or write
* bit_width - Field width in bits (8, 16, or 32)
* value - Pointer to in or out value
* handler_context - Pointer to Handler's context
* region_context - Pointer to context specific to the
* accessed region
*
* RETURN: Status
*
* DESCRIPTION: Handler for the PCI bar_target address space (Op Region)
*
******************************************************************************/
acpi_status
acpi_ex_pci_bar_space_handler(u32 function,
acpi_physical_address address,
u32 bit_width,
u64 *value,
void *handler_context, void *region_context)
{
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE(ex_pci_bar_space_handler);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_data_table_space_handler
*
* PARAMETERS: function - Read or Write operation
* address - Where in the space to read or write
* bit_width - Field width in bits (8, 16, or 32)
* value - Pointer to in or out value
* handler_context - Pointer to Handler's context
* region_context - Pointer to context specific to the
* accessed region
*
* RETURN: Status
*
* DESCRIPTION: Handler for the Data Table address space (Op Region)
*
******************************************************************************/
acpi_status
acpi_ex_data_table_space_handler(u32 function,
acpi_physical_address address,
u32 bit_width,
u64 *value,
void *handler_context, void *region_context)
{
ACPI_FUNCTION_TRACE(ex_data_table_space_handler);
/*
* Perform the memory read or write. The bit_width was already
* validated.
*/
switch (function) {
case ACPI_READ:
ACPI_MEMCPY(ACPI_CAST_PTR(char, value),
ACPI_PHYSADDR_TO_PTR(address),
ACPI_DIV_8(bit_width));
break;
case ACPI_WRITE:
ACPI_MEMCPY(ACPI_PHYSADDR_TO_PTR(address),
ACPI_CAST_PTR(char, value), ACPI_DIV_8(bit_width));
break;
default:
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
return_ACPI_STATUS(AE_OK);
}
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