path: root/drivers/acpi/tables/tbfadt.c

/******************************************************************************
 *
 * Module Name: tbfadt   - FADT table utilities
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2006, 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/actables.h>

#define _COMPONENT          ACPI_TABLES
ACPI_MODULE_NAME("tbfadt")

/* Local prototypes */
static void inline
acpi_tb_init_generic_address(struct acpi_generic_address *new_gas_struct,
			     u8 bit_width, u64 address);

static void acpi_tb_fadt_register_error(char *register_name, u32 value);

static void acpi_tb_convert_fadt(void);

static void acpi_tb_validate_fadt(void);

/* Table used for conversion of FADT to common format */

typedef struct acpi_fadt_conversion {
	u8 target;
	u8 source;
	u8 length;

} acpi_fadt_conversion;

static struct acpi_fadt_conversion fadt_conversion_table[] = {
	{ACPI_FADT_OFFSET(xpm1a_event_block),
	 ACPI_FADT_OFFSET(pm1a_event_block),
	 ACPI_FADT_OFFSET(pm1_event_length)},
	{ACPI_FADT_OFFSET(xpm1b_event_block),
	 ACPI_FADT_OFFSET(pm1b_event_block),
	 ACPI_FADT_OFFSET(pm1_event_length)},
	{ACPI_FADT_OFFSET(xpm1a_control_block),
	 ACPI_FADT_OFFSET(pm1a_control_block),
	 ACPI_FADT_OFFSET(pm1_control_length)},
	{ACPI_FADT_OFFSET(xpm1b_control_block),
	 ACPI_FADT_OFFSET(pm1b_control_block),
	 ACPI_FADT_OFFSET(pm1_control_length)},
	{ACPI_FADT_OFFSET(xpm2_control_block),
	 ACPI_FADT_OFFSET(pm2_control_block),
	 ACPI_FADT_OFFSET(pm2_control_length)},
	{ACPI_FADT_OFFSET(xpm_timer_block), ACPI_FADT_OFFSET(pm_timer_block),
	 ACPI_FADT_OFFSET(pm_timer_length)},
	{ACPI_FADT_OFFSET(xgpe0_block), ACPI_FADT_OFFSET(gpe0_block),
	 ACPI_FADT_OFFSET(gpe0_block_length)},
	{ACPI_FADT_OFFSET(xgpe1_block), ACPI_FADT_OFFSET(gpe1_block),
	 ACPI_FADT_OFFSET(gpe1_block_length)}
};

#define ACPI_FADT_CONVERSION_ENTRIES        (sizeof (fadt_conversion_table) / sizeof (struct acpi_fadt_conversion))

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_init_generic_address
 *
 * PARAMETERS:  new_gas_struct      - GAS struct to be initialized
 *              bit_width           - Width of this register
 *              Address             - Address of the register
 *
 * RETURN:      None
 *
 * DESCRIPTION: Initialize a GAS structure.
 *
 ******************************************************************************/

static void inline
acpi_tb_init_generic_address(struct acpi_generic_address *new_gas_struct,
			     u8 bit_width, u64 address)
{

	ACPI_MOVE_64_TO_64(&new_gas_struct->address, &address);
	new_gas_struct->space_id = ACPI_ADR_SPACE_SYSTEM_IO;
	new_gas_struct->bit_width = bit_width;
	new_gas_struct->bit_offset = 0;
	new_gas_struct->access_width = 0;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_parse_fadt
 *
 * PARAMETERS:  table_index         - Index for the FADT
 *              Flags               - Flags
 *
 * RETURN:      None
 *
 * DESCRIPTION: Initialize the FADT, DSDT and FACS tables
 *              (FADT contains the addresses of the DSDT and FACS)
 *
 ******************************************************************************/

void acpi_tb_parse_fadt(acpi_native_uint table_index, u8 flags)
{
	u32 length;
	struct acpi_table_header *table;

	/*
	 * Special case for the FADT because of multiple versions and the fact
	 * that it contains pointers to both the DSDT and FACS tables.
	 *
	 * Get a local copy of the FADT and convert it to a common format
	 * Map entire FADT, assumed to be smaller than one page.
	 */
	length = acpi_gbl_root_table_list.tables[table_index].length;

	table =
	    acpi_os_map_memory(acpi_gbl_root_table_list.tables[table_index].
			       address, length);
	if (!table) {
		return;
	}

	/*
	 * Validate the FADT checksum before we copy the table. Ignore
	 * checksum error as we want to try to get the DSDT and FACS.
	 */
	(void)acpi_tb_verify_checksum(table, length);

	/* Copy the entire FADT locally */

	ACPI_MEMSET(&acpi_gbl_FADT, 0, sizeof(struct acpi_table_fadt));

	ACPI_MEMCPY(&acpi_gbl_FADT, table,
		    ACPI_MIN(length, sizeof(struct acpi_table_fadt)));
	acpi_os_unmap_memory(table, length);

	/* Convert local FADT to the common internal format */

	acpi_tb_convert_fadt();

	/* Extract the DSDT and FACS tables from the FADT */

	acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xdsdt,
			      flags, ACPI_SIG_DSDT, ACPI_TABLE_INDEX_DSDT);

	acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xfacs,
			      flags, ACPI_SIG_FACS, ACPI_TABLE_INDEX_FACS);

	/* Validate important FADT values */

	acpi_tb_validate_fadt();
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_convert_fadt
 *
 * PARAMETERS:  None, uses acpi_gbl_FADT
 *
 * RETURN:      None
 *
 * DESCRIPTION: Converts all versions of the FADT to a common internal format.
 *
 * NOTE:        acpi_gbl_FADT must be of size (struct acpi_table_fadt),
 *              and must contain a copy of the actual FADT.
 *
 * ACPICA will use the "X" fields of the FADT for all addresses.
 *
 * "X" fields are optional extensions to the original V1.0 fields. Even if
 * they are present in the structure, they can be optionally not used by
 * setting them to zero. Therefore, we must selectively expand V1.0 fields
 * if the corresponding X field is zero.
 *
 * For ACPI 1.0 FADTs, all address fields are expanded to the corresponding
 * "X" fields.
 *
 * For ACPI 2.0 FADTs, any "X" fields that are NULL are filled in by
 * expanding the corresponding ACPI 1.0 field.
 *
 ******************************************************************************/

static void acpi_tb_convert_fadt(void)
{
	u8 pm1_register_length;
	struct acpi_generic_address *target;
	acpi_native_uint i;

	/* Expand the FACS and DSDT addresses as necessary */

	if (!acpi_gbl_FADT.Xfacs) {
		acpi_gbl_FADT.Xfacs = (u64) acpi_gbl_FADT.facs;
	}

	if (!acpi_gbl_FADT.Xdsdt) {
		acpi_gbl_FADT.Xdsdt = (u64) acpi_gbl_FADT.dsdt;
	}

	/*
	 * Expand the 32-bit V1.0 addresses to the 64-bit "X" generic address
	 * structures as necessary.
	 */
	for (i = 0; i < ACPI_FADT_CONVERSION_ENTRIES; i++) {
		target =
		    ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT,
				 fadt_conversion_table[i].target);

		/* Expand only if the X target is null */

		if (!target->address) {
			acpi_tb_init_generic_address(target,
						     *ACPI_ADD_PTR(u8,
								   &acpi_gbl_FADT,
								   fadt_conversion_table
								   [i].length),
						     (u64) * ACPI_ADD_PTR(u32,
									  &acpi_gbl_FADT,
									  fadt_conversion_table
									  [i].
									  source));
		}
	}

	/*
	 * Calculate separate GAS structs for the PM1 Enable registers.
	 * These addresses do not appear (directly) in the FADT, so it is
	 * useful to calculate them once, here.
	 *
	 * The PM event blocks are split into two register blocks, first is the
	 * PM Status Register block, followed immediately by the PM Enable Register
	 * block. Each is of length (pm1_event_length/2)
	 */
	pm1_register_length = (u8) ACPI_DIV_2(acpi_gbl_FADT.pm1_event_length);

	/* PM1A is required */

	acpi_tb_init_generic_address(&acpi_gbl_xpm1a_enable,
				     pm1_register_length,
				     (acpi_gbl_FADT.xpm1a_event_block.address +
				      pm1_register_length));

	/* PM1B is optional; leave null if not present */

	if (acpi_gbl_FADT.xpm1b_event_block.address) {
		acpi_tb_init_generic_address(&acpi_gbl_xpm1b_enable,
					     pm1_register_length,
					     (acpi_gbl_FADT.xpm1b_event_block.
					      address + pm1_register_length));
	}

	/* Global FADT is the new common V2.0 FADT  */

	acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_tb_validate_fadt
 *
 * PARAMETERS:  None
 *
 * RETURN:      None
 *
 * DESCRIPTION: Validate various ACPI registers in the FADT. For problems,
 *              issue a message, but no status is returned.
 *
 ******************************************************************************/

static void acpi_tb_validate_fadt(void)
{

	/* These length fields have a minimum value */

	if (acpi_gbl_FADT.pm1_event_length < 4) {
		acpi_tb_fadt_register_error("Pm1EventLength",
					    (u32) acpi_gbl_FADT.
					    pm1_event_length);
	}

	if (acpi_gbl_FADT.pm_timer_length < 4) {
		acpi_tb_fadt_register_error("PmTimerLength",
					    (u32) acpi_gbl_FADT.
					    pm_timer_length);
	}

	/* These length and address fields must be non-zero */

	if (!acpi_gbl_FADT.pm1_control_length) {
		acpi_tb_fadt_register_error("Pm1ControlLength", 0);
	}

	if (!acpi_gbl_FADT.xpm1a_event_block.address) {
		acpi_tb_fadt_register_error("XPm1aEventBlock.Address", 0);
	}

	if (!acpi_gbl_FADT.xpm1a_control_block.address) {
		acpi_tb_fadt_register_error("XPm1aControlBlock.Address", 0);
	}

	if (!acpi_gbl_FADT.xpm_timer_block.address) {
		acpi_tb_fadt_register_error("XPmTimerBlock.Address", 0);
	}

	/* If PM2 block is present, must have non-zero length */

	if ((acpi_gbl_FADT.xpm2_control_block.address &&
	     !acpi_gbl_FADT.pm2_control_length)) {
		acpi_tb_fadt_register_error("Pm2ControlLength",
					    (u32) acpi_gbl_FADT.
					    pm2_control_length);
	}

	/* Length of any valid GPE blocks must be a multiple of 2 */

	if (acpi_gbl_FADT.xgpe0_block.address &&
	    (acpi_gbl_FADT.gpe0_block_length & 1)) {
		acpi_tb_fadt_register_error("Gpe0BlockLength",
					    (u32) acpi_gbl_FADT.
					    gpe0_block_length);
	}

	if (acpi_gbl_FADT.xgpe1_block.address &&
	    (acpi_gbl_FADT.gpe1_block_length & 1)) {
		acpi_tb_fadt_register_error("Gpe1BlockLength",
					    (u32) acpi_gbl_FADT.
					    gpe1_block_length);
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_fadt_register_error
 *
 * PARAMETERS:  register_name           - Pointer to string identifying register
 *              Value                   - Actual register contents value
 *
 * RETURN:      None
 *
 * DESCRIPTION: Display FADT warning message
 *
 ******************************************************************************/

static void acpi_tb_fadt_register_error(char *register_name, u32 value)
{

	ACPI_WARNING((AE_INFO, "Invalid FADT value in field \"%s\" = %X",
		      register_name, value));
}