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);
+}