328 lines
8.4 KiB
C
328 lines
8.4 KiB
C
/*
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* File: pci-acpi.c
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* Purpose: Provide PCI support in ACPI
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*
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* Copyright (C) 2005 David Shaohua Li <shaohua.li@intel.com>
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* Copyright (C) 2004 Tom Long Nguyen <tom.l.nguyen@intel.com>
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* Copyright (C) 2004 Intel Corp.
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*/
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/module.h>
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#include <acpi/acpi.h>
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#include <acpi/acnamesp.h>
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#include <acpi/acresrc.h>
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#include <acpi/acpi_bus.h>
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#include <linux/pci-acpi.h>
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#include "pci.h"
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static u32 ctrlset_buf[3] = {0, 0, 0};
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static u32 global_ctrlsets = 0;
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static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40, 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
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static acpi_status
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acpi_query_osc (
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acpi_handle handle,
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u32 level,
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void *context,
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void **retval )
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{
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acpi_status status;
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struct acpi_object_list input;
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union acpi_object in_params[4];
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struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
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union acpi_object *out_obj;
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u32 osc_dw0;
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acpi_status *ret_status = (acpi_status *)retval;
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/* Setting up input parameters */
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input.count = 4;
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input.pointer = in_params;
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in_params[0].type = ACPI_TYPE_BUFFER;
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in_params[0].buffer.length = 16;
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in_params[0].buffer.pointer = OSC_UUID;
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in_params[1].type = ACPI_TYPE_INTEGER;
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in_params[1].integer.value = 1;
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in_params[2].type = ACPI_TYPE_INTEGER;
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in_params[2].integer.value = 3;
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in_params[3].type = ACPI_TYPE_BUFFER;
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in_params[3].buffer.length = 12;
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in_params[3].buffer.pointer = (u8 *)context;
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status = acpi_evaluate_object(handle, "_OSC", &input, &output);
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if (ACPI_FAILURE (status)) {
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printk(KERN_DEBUG
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"Evaluate _OSC Set fails. Status = 0x%04x\n", status);
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*ret_status = status;
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return status;
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}
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out_obj = output.pointer;
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if (out_obj->type != ACPI_TYPE_BUFFER) {
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printk(KERN_DEBUG
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"Evaluate _OSC returns wrong type\n");
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status = AE_TYPE;
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goto query_osc_out;
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}
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osc_dw0 = *((u32 *) out_obj->buffer.pointer);
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if (osc_dw0) {
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if (osc_dw0 & OSC_REQUEST_ERROR)
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printk(KERN_DEBUG "_OSC request fails\n");
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if (osc_dw0 & OSC_INVALID_UUID_ERROR)
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printk(KERN_DEBUG "_OSC invalid UUID\n");
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if (osc_dw0 & OSC_INVALID_REVISION_ERROR)
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printk(KERN_DEBUG "_OSC invalid revision\n");
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if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) {
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/* Update Global Control Set */
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global_ctrlsets = *((u32 *)(out_obj->buffer.pointer+8));
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status = AE_OK;
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goto query_osc_out;
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}
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status = AE_ERROR;
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goto query_osc_out;
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}
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/* Update Global Control Set */
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global_ctrlsets = *((u32 *)(out_obj->buffer.pointer + 8));
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status = AE_OK;
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query_osc_out:
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kfree(output.pointer);
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*ret_status = status;
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return status;
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}
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static acpi_status
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acpi_run_osc (
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acpi_handle handle,
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void *context)
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{
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acpi_status status;
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struct acpi_object_list input;
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union acpi_object in_params[4];
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struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
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union acpi_object *out_obj;
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u32 osc_dw0;
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/* Setting up input parameters */
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input.count = 4;
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input.pointer = in_params;
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in_params[0].type = ACPI_TYPE_BUFFER;
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in_params[0].buffer.length = 16;
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in_params[0].buffer.pointer = OSC_UUID;
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in_params[1].type = ACPI_TYPE_INTEGER;
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in_params[1].integer.value = 1;
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in_params[2].type = ACPI_TYPE_INTEGER;
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in_params[2].integer.value = 3;
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in_params[3].type = ACPI_TYPE_BUFFER;
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in_params[3].buffer.length = 12;
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in_params[3].buffer.pointer = (u8 *)context;
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status = acpi_evaluate_object(handle, "_OSC", &input, &output);
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if (ACPI_FAILURE (status)) {
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printk(KERN_DEBUG
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"Evaluate _OSC Set fails. Status = 0x%04x\n", status);
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return status;
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}
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out_obj = output.pointer;
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if (out_obj->type != ACPI_TYPE_BUFFER) {
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printk(KERN_DEBUG
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"Evaluate _OSC returns wrong type\n");
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status = AE_TYPE;
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goto run_osc_out;
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}
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osc_dw0 = *((u32 *) out_obj->buffer.pointer);
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if (osc_dw0) {
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if (osc_dw0 & OSC_REQUEST_ERROR)
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printk(KERN_DEBUG "_OSC request fails\n");
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if (osc_dw0 & OSC_INVALID_UUID_ERROR)
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printk(KERN_DEBUG "_OSC invalid UUID\n");
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if (osc_dw0 & OSC_INVALID_REVISION_ERROR)
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printk(KERN_DEBUG "_OSC invalid revision\n");
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if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) {
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printk(KERN_DEBUG "_OSC FW not grant req. control\n");
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status = AE_SUPPORT;
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goto run_osc_out;
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}
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status = AE_ERROR;
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goto run_osc_out;
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}
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status = AE_OK;
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run_osc_out:
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kfree(output.pointer);
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return status;
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}
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/**
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* pci_osc_support_set - register OS support to Firmware
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* @flags: OS support bits
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*
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* Update OS support fields and doing a _OSC Query to obtain an update
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* from Firmware on supported control bits.
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**/
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acpi_status pci_osc_support_set(u32 flags)
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{
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u32 temp;
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acpi_status retval;
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if (!(flags & OSC_SUPPORT_MASKS)) {
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return AE_TYPE;
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}
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ctrlset_buf[OSC_SUPPORT_TYPE] |= (flags & OSC_SUPPORT_MASKS);
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/* do _OSC query for all possible controls */
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temp = ctrlset_buf[OSC_CONTROL_TYPE];
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ctrlset_buf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
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ctrlset_buf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
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acpi_get_devices ( PCI_ROOT_HID_STRING,
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acpi_query_osc,
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ctrlset_buf,
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(void **) &retval );
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ctrlset_buf[OSC_QUERY_TYPE] = !OSC_QUERY_ENABLE;
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ctrlset_buf[OSC_CONTROL_TYPE] = temp;
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if (ACPI_FAILURE(retval)) {
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/* no osc support at all */
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ctrlset_buf[OSC_SUPPORT_TYPE] = 0;
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}
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return AE_OK;
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}
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EXPORT_SYMBOL(pci_osc_support_set);
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/**
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* pci_osc_control_set - commit requested control to Firmware
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* @handle: acpi_handle for the target ACPI object
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* @flags: driver's requested control bits
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*
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* Attempt to take control from Firmware on requested control bits.
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**/
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acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
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{
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acpi_status status;
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u32 ctrlset;
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ctrlset = (flags & OSC_CONTROL_MASKS);
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if (!ctrlset) {
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return AE_TYPE;
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}
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if (ctrlset_buf[OSC_SUPPORT_TYPE] &&
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((global_ctrlsets & ctrlset) != ctrlset)) {
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return AE_SUPPORT;
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}
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ctrlset_buf[OSC_CONTROL_TYPE] |= ctrlset;
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status = acpi_run_osc(handle, ctrlset_buf);
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if (ACPI_FAILURE (status)) {
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ctrlset_buf[OSC_CONTROL_TYPE] &= ~ctrlset;
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}
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return status;
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}
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EXPORT_SYMBOL(pci_osc_control_set);
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/*
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* _SxD returns the D-state with the highest power
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* (lowest D-state number) supported in the S-state "x".
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*
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* If the devices does not have a _PRW
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* (Power Resources for Wake) supporting system wakeup from "x"
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* then the OS is free to choose a lower power (higher number
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* D-state) than the return value from _SxD.
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*
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* But if _PRW is enabled at S-state "x", the OS
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* must not choose a power lower than _SxD --
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* unless the device has an _SxW method specifying
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* the lowest power (highest D-state number) the device
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* may enter while still able to wake the system.
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*
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* ie. depending on global OS policy:
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*
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* if (_PRW at S-state x)
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* choose from highest power _SxD to lowest power _SxW
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* else // no _PRW at S-state x
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* choose highest power _SxD or any lower power
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*
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* currently we simply return _SxD, if present.
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*/
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static int acpi_pci_choose_state(struct pci_dev *pdev, pm_message_t state)
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{
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/* TBD */
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return -ENODEV;
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}
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static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
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{
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acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
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static int state_conv[] = {
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[0] = 0,
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[1] = 1,
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[2] = 2,
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[3] = 3,
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[4] = 3
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};
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int acpi_state = state_conv[(int __force) state];
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if (!handle)
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return -ENODEV;
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return acpi_bus_set_power(handle, acpi_state);
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}
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/* ACPI bus type */
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static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
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{
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struct pci_dev * pci_dev;
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acpi_integer addr;
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pci_dev = to_pci_dev(dev);
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/* Please ref to ACPI spec for the syntax of _ADR */
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addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
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*handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
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if (!*handle)
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return -ENODEV;
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return 0;
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}
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static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle)
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{
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int num;
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unsigned int seg, bus;
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/*
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* The string should be the same as root bridge's name
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* Please look at 'pci_scan_bus_parented'
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*/
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num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus);
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if (num != 2)
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return -ENODEV;
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*handle = acpi_get_pci_rootbridge_handle(seg, bus);
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if (!*handle)
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return -ENODEV;
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return 0;
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}
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static struct acpi_bus_type acpi_pci_bus = {
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.bus = &pci_bus_type,
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.find_device = acpi_pci_find_device,
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.find_bridge = acpi_pci_find_root_bridge,
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};
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static int __init acpi_pci_init(void)
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{
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int ret;
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ret = register_acpi_bus_type(&acpi_pci_bus);
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if (ret)
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return 0;
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platform_pci_choose_state = acpi_pci_choose_state;
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platform_pci_set_power_state = acpi_pci_set_power_state;
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return 0;
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}
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arch_initcall(acpi_pci_init);
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