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linux/drivers/acpi/executer/exregion.c

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/******************************************************************************
*
* Module Name: exregion - ACPI default op_region (address space) handlers
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2005, R. Byron Moore
* 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 <acpi/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,
acpi_integer * 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 window_size;
#ifndef ACPI_MISALIGNED_TRANSFERS
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_DEBUG_PRINT((ACPI_DB_ERROR,
"Invalid system_memory width %d\n",
bit_width));
return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
}
#ifndef ACPI_MISALIGNED_TRANSFERS
/*
* Hardware does not support non-aligned data transfers, we must verify
* the request.
*/
(void)acpi_ut_short_divide((acpi_integer) 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) ||
(((acpi_integer) address + length) > ((acpi_integer)
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);
}
/*
* Don't attempt to map memory beyond the end of the region, and
* constrain the maximum mapping size to something reasonable.
*/
window_size = (acpi_size)
((mem_info->address + mem_info->length) - address);
if (window_size > ACPI_SYSMEM_REGION_WINDOW_SIZE) {
window_size = ACPI_SYSMEM_REGION_WINDOW_SIZE;
}
/* Create a new mapping starting at the address given */
status = acpi_os_map_memory(address, window_size,
(void **)&mem_info->
mapped_logical_address);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Could not map memory at %8.8X%8.8X, size %X\n",
ACPI_FORMAT_UINT64(address),
(u32) window_size));
mem_info->mapped_length = 0;
return_ACPI_STATUS(status);
}
/* Save the physical address and mapping size */
mem_info->mapped_physical_address = address;
mem_info->mapped_length = window_size;
}
/*
* Generate a logical pointer corresponding to the address we want to
* access
*/
logical_addr_ptr = mem_info->mapped_logical_address +
((acpi_integer) address -
(acpi_integer) mem_info->mapped_physical_address);
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"system_memory %d (%d width) Address=%8.8X%8.8X\n",
function, bit_width, ACPI_FORMAT_UINT64(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 = (acpi_integer) * ((u8 *) logical_addr_ptr);
break;
case 16:
*value = (acpi_integer) * ((u16 *) logical_addr_ptr);
break;
case 32:
*value = (acpi_integer) * ((u32 *) logical_addr_ptr);
break;
#if ACPI_MACHINE_WIDTH != 16
case 64:
*value = (acpi_integer) * ((u64 *) logical_addr_ptr);
break;
#endif
default:
/* bit_width was already validated */
break;
}
break;
case ACPI_WRITE:
switch (bit_width) {
case 8:
*(u8 *) logical_addr_ptr = (u8) * value;
break;
case 16:
*(u16 *) logical_addr_ptr = (u16) * value;
break;
case 32:
*(u32 *) logical_addr_ptr = (u32) * value;
break;
#if ACPI_MACHINE_WIDTH != 16
case 64:
*(u64 *) logical_addr_ptr = (u64) * value;
break;
#endif
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,
acpi_integer * 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 %d (%d width) Address=%8.8X%8.8X\n",
function, bit_width, ACPI_FORMAT_UINT64(address)));
/* Decode the function parameter */
switch (function) {
case ACPI_READ:
status = acpi_os_read_port((acpi_io_address) address,
&value32, bit_width);
*value = value32;
break;
case ACPI_WRITE:
status = acpi_os_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,
acpi_integer * 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 %d (%d) 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,
acpi_integer * 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,
acpi_integer * 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,
acpi_integer * value,
void *handler_context, void *region_context)
{
acpi_status status = AE_OK;
u32 byte_width = ACPI_DIV_8(bit_width);
u32 i;
char *logical_addr_ptr;
ACPI_FUNCTION_TRACE("ex_data_table_space_handler");
logical_addr_ptr = ACPI_PHYSADDR_TO_PTR(address);
/* Perform the memory read or write */
switch (function) {
case ACPI_READ:
for (i = 0; i < byte_width; i++) {
((char *)value)[i] = logical_addr_ptr[i];
}
break;
case ACPI_WRITE:
default:
return_ACPI_STATUS(AE_SUPPORT);
}
return_ACPI_STATUS(status);
}
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