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linux/drivers/pci/pci-acpi.c
rajesh.shah@intel.com 427bf532b5 [PATCH] pciehp: request control of each hotplug controller individually 
This patch tweaks the way pciehp requests control of the hotplug
hardware from BIOS. It now tries to invoke the ACPI _OSC method
for a specific hotplug controller only, rather than walking the
entire acpi namespace invoking all possible _OSC methods under
all host bridges. This allows us to gain control of each hotplug
controller individually, even if BIOS fails to give us control of
some other hotplug controller in the system.

Signed-off-by: Rajesh Shah <rajesh.shah@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-11-10 16:09:15 -08:00

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