diff options
Diffstat (limited to 'drivers/acpi/acpica/hwregs.c')
| -rw-r--r-- | drivers/acpi/acpica/hwregs.c | 353 |
1 files changed, 353 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/hwregs.c b/drivers/acpi/acpica/hwregs.c new file mode 100644 index 000000000000..4dc43b018517 --- /dev/null +++ b/drivers/acpi/acpica/hwregs.c @@ -0,0 +1,353 @@ + +/******************************************************************************* + * + * Module Name: hwregs - Read/write access functions for the various ACPI + * control and status registers. + * + ******************************************************************************/ + +/* + * Copyright (C) 2000 - 2008, 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 "acnamesp.h" +#include "acevents.h" + +#define _COMPONENT ACPI_HARDWARE +ACPI_MODULE_NAME("hwregs") + +/******************************************************************************* + * + * FUNCTION: acpi_hw_clear_acpi_status + * + * PARAMETERS: None + * + * RETURN: Status + * + * DESCRIPTION: Clears all fixed and general purpose status bits + * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED + * + ******************************************************************************/ +acpi_status acpi_hw_clear_acpi_status(void) +{ + acpi_status status; + acpi_cpu_flags lock_flags = 0; + + ACPI_FUNCTION_TRACE(hw_clear_acpi_status); + + ACPI_DEBUG_PRINT((ACPI_DB_IO, "About to write %04X to %04X\n", + ACPI_BITMASK_ALL_FIXED_STATUS, + (u16) acpi_gbl_FADT.xpm1a_event_block.address)); + + lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock); + + status = acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS, + ACPI_BITMASK_ALL_FIXED_STATUS); + if (ACPI_FAILURE(status)) { + goto unlock_and_exit; + } + + /* Clear the fixed events */ + + if (acpi_gbl_FADT.xpm1b_event_block.address) { + status = acpi_write(ACPI_BITMASK_ALL_FIXED_STATUS, + &acpi_gbl_FADT.xpm1b_event_block); + if (ACPI_FAILURE(status)) { + goto unlock_and_exit; + } + } + + /* Clear the GPE Bits in all GPE registers in all GPE blocks */ + + status = acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block, NULL); + + unlock_and_exit: + acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags); + return_ACPI_STATUS(status); +} + +/******************************************************************************* + * + * FUNCTION: acpi_hw_get_register_bit_mask + * + * PARAMETERS: register_id - Index of ACPI Register to access + * + * RETURN: The bitmask to be used when accessing the register + * + * DESCRIPTION: Map register_id into a register bitmask. + * + ******************************************************************************/ + +struct acpi_bit_register_info *acpi_hw_get_bit_register_info(u32 register_id) +{ + ACPI_FUNCTION_ENTRY(); + + if (register_id > ACPI_BITREG_MAX) { + ACPI_ERROR((AE_INFO, "Invalid BitRegister ID: %X", + register_id)); + return (NULL); + } + + return (&acpi_gbl_bit_register_info[register_id]); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_register_read + * + * PARAMETERS: register_id - ACPI Register ID + * return_value - Where the register value is returned + * + * RETURN: Status and the value read. + * + * DESCRIPTION: Read from the specified ACPI register + * + ******************************************************************************/ +acpi_status +acpi_hw_register_read(u32 register_id, u32 * return_value) +{ + u32 value1 = 0; + u32 value2 = 0; + acpi_status status; + + ACPI_FUNCTION_TRACE(hw_register_read); + + switch (register_id) { + case ACPI_REGISTER_PM1_STATUS: /* 16-bit access */ + + status = acpi_read(&value1, &acpi_gbl_FADT.xpm1a_event_block); + if (ACPI_FAILURE(status)) { + goto exit; + } + + /* PM1B is optional */ + + status = acpi_read(&value2, &acpi_gbl_FADT.xpm1b_event_block); + value1 |= value2; + break; + + case ACPI_REGISTER_PM1_ENABLE: /* 16-bit access */ + + status = acpi_read(&value1, &acpi_gbl_xpm1a_enable); + if (ACPI_FAILURE(status)) { + goto exit; + } + + /* PM1B is optional */ + + status = acpi_read(&value2, &acpi_gbl_xpm1b_enable); + value1 |= value2; + break; + + case ACPI_REGISTER_PM1_CONTROL: /* 16-bit access */ + + status = acpi_read(&value1, &acpi_gbl_FADT.xpm1a_control_block); + if (ACPI_FAILURE(status)) { + goto exit; + } + + status = acpi_read(&value2, &acpi_gbl_FADT.xpm1b_control_block); + value1 |= value2; + break; + + case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */ + + status = acpi_read(&value1, &acpi_gbl_FADT.xpm2_control_block); + break; + + case ACPI_REGISTER_PM_TIMER: /* 32-bit access */ + + status = acpi_read(&value1, &acpi_gbl_FADT.xpm_timer_block); + break; + + case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */ + + status = + acpi_os_read_port(acpi_gbl_FADT.smi_command, &value1, 8); + break; + + default: + ACPI_ERROR((AE_INFO, "Unknown Register ID: %X", register_id)); + status = AE_BAD_PARAMETER; + break; + } + + exit: + + if (ACPI_SUCCESS(status)) { + *return_value = value1; + } + + return_ACPI_STATUS(status); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_register_write + * + * PARAMETERS: register_id - ACPI Register ID + * Value - The value to write + * + * RETURN: Status + * + * DESCRIPTION: Write to the specified ACPI register + * + * NOTE: In accordance with the ACPI specification, this function automatically + * preserves the value of the following bits, meaning that these bits cannot be + * changed via this interface: + * + * PM1_CONTROL[0] = SCI_EN + * PM1_CONTROL[9] + * PM1_STATUS[11] + * + * ACPI References: + * 1) Hardware Ignored Bits: When software writes to a register with ignored + * bit fields, it preserves the ignored bit fields + * 2) SCI_EN: OSPM always preserves this bit position + * + ******************************************************************************/ + +acpi_status acpi_hw_register_write(u32 register_id, u32 value) +{ + acpi_status status; + u32 read_value; + + ACPI_FUNCTION_TRACE(hw_register_write); + + switch (register_id) { + case ACPI_REGISTER_PM1_STATUS: /* 16-bit access */ + + /* Perform a read first to preserve certain bits (per ACPI spec) */ + + status = acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, + &read_value); + if (ACPI_FAILURE(status)) { + goto exit; + } + + /* Insert the bits to be preserved */ + + ACPI_INSERT_BITS(value, ACPI_PM1_STATUS_PRESERVED_BITS, + read_value); + + /* Now we can write the data */ + + status = acpi_write(value, &acpi_gbl_FADT.xpm1a_event_block); + if (ACPI_FAILURE(status)) { + goto exit; + } + + /* PM1B is optional */ + + status = acpi_write(value, &acpi_gbl_FADT.xpm1b_event_block); + break; + + case ACPI_REGISTER_PM1_ENABLE: /* 16-bit access */ + + status = acpi_write(value, &acpi_gbl_xpm1a_enable); + if (ACPI_FAILURE(status)) { + goto exit; + } + + /* PM1B is optional */ + + status = acpi_write(value, &acpi_gbl_xpm1b_enable); + break; + + case ACPI_REGISTER_PM1_CONTROL: /* 16-bit access */ + + /* + * Perform a read first to preserve certain bits (per ACPI spec) + */ + status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL, + &read_value); + if (ACPI_FAILURE(status)) { + goto exit; + } + + /* Insert the bits to be preserved */ + + ACPI_INSERT_BITS(value, ACPI_PM1_CONTROL_PRESERVED_BITS, + read_value); + + /* Now we can write the data */ + + status = acpi_write(value, &acpi_gbl_FADT.xpm1a_control_block); + if (ACPI_FAILURE(status)) { + goto exit; + } + + status = acpi_write(value, &acpi_gbl_FADT.xpm1b_control_block); + break; + + case ACPI_REGISTER_PM1A_CONTROL: /* 16-bit access */ + + status = acpi_write(value, &acpi_gbl_FADT.xpm1a_control_block); + break; + + case ACPI_REGISTER_PM1B_CONTROL: /* 16-bit access */ + + status = acpi_write(value, &acpi_gbl_FADT.xpm1b_control_block); + break; + + case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */ + + status = acpi_write(value, &acpi_gbl_FADT.xpm2_control_block); + break; + + case ACPI_REGISTER_PM_TIMER: /* 32-bit access */ + + status = acpi_write(value, &acpi_gbl_FADT.xpm_timer_block); + break; + + case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */ + + /* SMI_CMD is currently always in IO space */ + + status = + acpi_os_write_port(acpi_gbl_FADT.smi_command, value, 8); + break; + + default: + status = AE_BAD_PARAMETER; + break; + } + + exit: + return_ACPI_STATUS(status); +} |