401 строка
10 KiB
C
401 строка
10 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 <linux/pci-aspm.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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struct acpi_osc_data {
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acpi_handle handle;
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u32 support_set;
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u32 control_set;
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int is_queried;
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u32 query_result;
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struct list_head sibiling;
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};
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static LIST_HEAD(acpi_osc_data_list);
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struct acpi_osc_args {
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u32 capbuf[3];
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u32 query_result;
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};
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static DEFINE_MUTEX(pci_acpi_lock);
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static struct acpi_osc_data *acpi_get_osc_data(acpi_handle handle)
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{
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struct acpi_osc_data *data;
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list_for_each_entry(data, &acpi_osc_data_list, sibiling) {
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if (data->handle == handle)
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return data;
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}
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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return NULL;
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INIT_LIST_HEAD(&data->sibiling);
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data->handle = handle;
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list_add_tail(&data->sibiling, &acpi_osc_data_list);
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return data;
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}
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static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40,
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0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
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static acpi_status acpi_run_osc(acpi_handle handle,
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struct acpi_osc_args *osc_args)
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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, flags = osc_args->capbuf[OSC_QUERY_TYPE];
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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 *)osc_args->capbuf;
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status = acpi_evaluate_object(handle, "_OSC", &input, &output);
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if (ACPI_FAILURE(status))
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return status;
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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 "Evaluate _OSC returns wrong type\n");
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status = AE_TYPE;
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goto out_kfree;
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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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if (flags & OSC_QUERY_ENABLE)
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goto out_success;
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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 out_kfree;
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}
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status = AE_ERROR;
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goto out_kfree;
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}
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out_success:
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if (flags & OSC_QUERY_ENABLE)
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osc_args->query_result =
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*((u32 *)(out_obj->buffer.pointer + 8));
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status = AE_OK;
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out_kfree:
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kfree(output.pointer);
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return status;
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}
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static acpi_status acpi_query_osc(acpi_handle handle,
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u32 level, void *context, void **retval)
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{
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acpi_status status;
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struct acpi_osc_data *osc_data;
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u32 flags = (unsigned long)context, support_set;
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acpi_handle tmp;
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struct acpi_osc_args osc_args;
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status = acpi_get_handle(handle, "_OSC", &tmp);
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if (ACPI_FAILURE(status))
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return status;
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mutex_lock(&pci_acpi_lock);
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osc_data = acpi_get_osc_data(handle);
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if (!osc_data) {
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printk(KERN_ERR "acpi osc data array is full\n");
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status = AE_ERROR;
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goto out;
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}
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/* do _OSC query for all possible controls */
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support_set = osc_data->support_set | (flags & OSC_SUPPORT_MASKS);
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osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
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osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set;
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osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
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status = acpi_run_osc(handle, &osc_args);
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if (ACPI_SUCCESS(status)) {
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osc_data->support_set = support_set;
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osc_data->query_result = osc_args.query_result;
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osc_data->is_queried = 1;
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}
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out:
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mutex_unlock(&pci_acpi_lock);
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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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* @hid: hardware ID
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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, const char *hid)
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{
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if (!(flags & OSC_SUPPORT_MASKS))
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return AE_TYPE;
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acpi_get_devices(hid, acpi_query_osc,
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(void *)(unsigned long)flags, NULL);
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return AE_OK;
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}
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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, control_set;
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acpi_handle tmp;
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struct acpi_osc_data *osc_data;
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struct acpi_osc_args osc_args;
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status = acpi_get_handle(handle, "_OSC", &tmp);
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if (ACPI_FAILURE(status))
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return status;
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mutex_lock(&pci_acpi_lock);
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osc_data = acpi_get_osc_data(handle);
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if (!osc_data) {
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printk(KERN_ERR "acpi osc data array is full\n");
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status = AE_ERROR;
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goto out;
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}
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ctrlset = (flags & OSC_CONTROL_MASKS);
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if (!ctrlset) {
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status = AE_TYPE;
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goto out;
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}
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if (osc_data->is_queried &&
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((osc_data->query_result & ctrlset) != ctrlset)) {
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status = AE_SUPPORT;
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goto out;
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}
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control_set = osc_data->control_set | ctrlset;
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osc_args.capbuf[OSC_QUERY_TYPE] = 0;
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osc_args.capbuf[OSC_SUPPORT_TYPE] = osc_data->support_set;
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osc_args.capbuf[OSC_CONTROL_TYPE] = control_set;
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status = acpi_run_osc(handle, &osc_args);
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if (ACPI_SUCCESS(status))
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osc_data->control_set = control_set;
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out:
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mutex_unlock(&pci_acpi_lock);
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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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static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
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{
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int acpi_state;
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acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL);
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if (acpi_state < 0)
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return PCI_POWER_ERROR;
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switch (acpi_state) {
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case ACPI_STATE_D0:
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return PCI_D0;
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case ACPI_STATE_D1:
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return PCI_D1;
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case ACPI_STATE_D2:
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return PCI_D2;
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case ACPI_STATE_D3:
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return PCI_D3hot;
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}
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return PCI_POWER_ERROR;
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}
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static bool acpi_pci_power_manageable(struct pci_dev *dev)
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{
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acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
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return handle ? acpi_bus_power_manageable(handle) : false;
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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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acpi_handle tmp;
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static const u8 state_conv[] = {
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[PCI_D0] = ACPI_STATE_D0,
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[PCI_D1] = ACPI_STATE_D1,
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[PCI_D2] = ACPI_STATE_D2,
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[PCI_D3hot] = ACPI_STATE_D3,
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[PCI_D3cold] = ACPI_STATE_D3
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};
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int error = -EINVAL;
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/* If the ACPI device has _EJ0, ignore the device */
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if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
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return -ENODEV;
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switch (state) {
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case PCI_D0:
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case PCI_D1:
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case PCI_D2:
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case PCI_D3hot:
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case PCI_D3cold:
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error = acpi_bus_set_power(handle, state_conv[state]);
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}
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if (!error)
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dev_printk(KERN_INFO, &dev->dev,
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"power state changed by ACPI to D%d\n", state);
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return error;
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}
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static bool acpi_pci_can_wakeup(struct pci_dev *dev)
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{
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acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
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return handle ? acpi_bus_can_wakeup(handle) : false;
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}
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static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
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{
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int error = acpi_pm_device_sleep_wake(&dev->dev, enable);
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if (!error)
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dev_printk(KERN_INFO, &dev->dev,
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"wake-up capability %s by ACPI\n",
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enable ? "enabled" : "disabled");
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return error;
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}
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static struct pci_platform_pm_ops acpi_pci_platform_pm = {
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.is_manageable = acpi_pci_power_manageable,
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.set_state = acpi_pci_set_power_state,
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.choose_state = acpi_pci_choose_state,
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.can_wakeup = acpi_pci_can_wakeup,
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.sleep_wake = acpi_pci_sleep_wake,
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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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if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) {
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printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
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pci_no_msi();
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}
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if (acpi_gbl_FADT.boot_flags & BAF_PCIE_ASPM_CONTROL) {
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printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
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pcie_no_aspm();
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}
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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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pci_set_platform_pm(&acpi_pci_platform_pm);
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return 0;
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}
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arch_initcall(acpi_pci_init);
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