![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
210 lines
5.5 KiB
C
210 lines
5.5 KiB
C
/*
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* File: pci-acpi.c
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* Purpose: Provide PCI supports in ACPI
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*
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* Copyright (C) 2004 Intel
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* Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
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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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static u32 ctrlset_buf[3] = {0, 0, 0};
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static u32 global_ctrlsets = 0;
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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;
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union acpi_object out_obj;
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u32 osc_dw0;
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/* Setting up output buffer */
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output.length = sizeof(out_obj) + 3*sizeof(u32);
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output.pointer = &out_obj;
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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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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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return AE_TYPE;
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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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return AE_OK;
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}
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return AE_ERROR;
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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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return AE_OK;
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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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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;
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union acpi_object out_obj;
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u32 osc_dw0;
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/* Setting up output buffer */
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output.length = sizeof(out_obj) + 3*sizeof(u32);
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output.pointer = &out_obj;
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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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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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return AE_TYPE;
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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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return AE_SUPPORT;
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}
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return AE_ERROR;
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}
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return AE_OK;
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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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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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NULL );
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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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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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* @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(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_get_devices ( PCI_ROOT_HID_STRING,
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acpi_run_osc,
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ctrlset_buf,
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NULL );
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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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