/*
* File: pci-acpi.c
- * Purpose: Provde PCI support in ACPI
+ * 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>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/module.h>
+#include <linux/pci-aspm.h>
#include <acpi/acpi.h>
-#include <acpi/acnamesp.h>
-#include <acpi/acresrc.h>
#include <acpi/acpi_bus.h>
#include <linux/pci-acpi.h>
+#include <linux/pm_runtime.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 DEFINE_MUTEX(pci_acpi_pm_notify_mtx);
-static acpi_status
-acpi_query_osc (
- acpi_handle handle,
- u32 level,
- void *context,
- void **retval )
+/**
+ * pci_acpi_wake_bus - Wake-up notification handler for root buses.
+ * @handle: ACPI handle of a device the notification is for.
+ * @event: Type of the signaled event.
+ * @context: PCI root bus to wake up devices on.
+ */
+static void pci_acpi_wake_bus(acpi_handle handle, u32 event, 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) {
- /* Update Global Control Set */
- global_ctrlsets = *((u32 *)(out_obj.buffer.pointer+8));
- return AE_OK;
- }
- return AE_ERROR;
- }
+ struct pci_bus *pci_bus = context;
- /* Update Global Control Set */
- global_ctrlsets = *((u32 *)(out_obj.buffer.pointer + 8));
- return AE_OK;
+ if (event == ACPI_NOTIFY_DEVICE_WAKE && pci_bus)
+ pci_pme_wakeup_bus(pci_bus);
}
-
-static acpi_status
-acpi_run_osc (
- acpi_handle handle,
- u32 level,
- void *context,
- void **retval )
+/**
+ * pci_acpi_wake_dev - Wake-up notification handler for PCI devices.
+ * @handle: ACPI handle of a device the notification is for.
+ * @event: Type of the signaled event.
+ * @context: PCI device object to wake up.
+ */
+static void pci_acpi_wake_dev(acpi_handle handle, u32 event, 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;
+ struct pci_dev *pci_dev = context;
+
+ if (event != ACPI_NOTIFY_DEVICE_WAKE || !pci_dev)
+ return;
+
+ if (!pci_dev->pm_cap || !pci_dev->pme_support
+ || pci_check_pme_status(pci_dev)) {
+ if (pci_dev->pme_poll)
+ pci_dev->pme_poll = false;
+
+ pci_wakeup_event(pci_dev);
+ pm_runtime_resume(&pci_dev->dev);
}
- return AE_OK;
+
+ if (pci_dev->subordinate)
+ pci_pme_wakeup_bus(pci_dev->subordinate);
}
/**
- * pci_osc_support_set - register OS support to Firmware
- * @flags: OS support bits
+ * add_pm_notifier - Register PM notifier for given ACPI device.
+ * @dev: ACPI device to add the notifier for.
+ * @context: PCI device or bus to check for PME status if an event is signaled.
*
- * 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)
+ * NOTE: @dev need not be a run-wake or wake-up device to be a valid source of
+ * PM wake-up events. For example, wake-up events may be generated for bridges
+ * if one of the devices below the bridge is signaling PME, even if the bridge
+ * itself doesn't have a wake-up GPE associated with it.
+ */
+static acpi_status add_pm_notifier(struct acpi_device *dev,
+ acpi_notify_handler handler,
+ void *context)
{
- u32 temp;
+ acpi_status status = AE_ALREADY_EXISTS;
- 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;
+ mutex_lock(&pci_acpi_pm_notify_mtx);
+
+ if (dev->wakeup.flags.notifier_present)
+ goto out;
+
+ status = acpi_install_notify_handler(dev->handle,
+ ACPI_SYSTEM_NOTIFY,
+ handler, context);
+ if (ACPI_FAILURE(status))
+ goto out;
+
+ dev->wakeup.flags.notifier_present = true;
+
+ out:
+ mutex_unlock(&pci_acpi_pm_notify_mtx);
+ return status;
}
-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(u32 flags)
+ * remove_pm_notifier - Unregister PM notifier from given ACPI device.
+ * @dev: ACPI device to remove the notifier from.
+ */
+static acpi_status remove_pm_notifier(struct acpi_device *dev,
+ acpi_notify_handler handler)
{
- acpi_status status;
- u32 ctrlset;
+ acpi_status status = AE_BAD_PARAMETER;
- 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_get_devices ( PCI_ROOT_HID_STRING,
- acpi_run_osc,
- ctrlset_buf,
- NULL );
- if (ACPI_FAILURE (status)) {
- ctrlset_buf[OSC_CONTROL_TYPE] &= ~ctrlset;
- }
-
+ mutex_lock(&pci_acpi_pm_notify_mtx);
+
+ if (!dev->wakeup.flags.notifier_present)
+ goto out;
+
+ status = acpi_remove_notify_handler(dev->handle,
+ ACPI_SYSTEM_NOTIFY,
+ handler);
+ if (ACPI_FAILURE(status))
+ goto out;
+
+ dev->wakeup.flags.notifier_present = false;
+
+ out:
+ mutex_unlock(&pci_acpi_pm_notify_mtx);
return status;
}
-EXPORT_SYMBOL(pci_osc_control_set);
+
+/**
+ * pci_acpi_add_bus_pm_notifier - Register PM notifier for given PCI bus.
+ * @dev: ACPI device to add the notifier for.
+ * @pci_bus: PCI bus to walk checking for PME status if an event is signaled.
+ */
+acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev,
+ struct pci_bus *pci_bus)
+{
+ return add_pm_notifier(dev, pci_acpi_wake_bus, pci_bus);
+}
+
+/**
+ * pci_acpi_remove_bus_pm_notifier - Unregister PCI bus PM notifier.
+ * @dev: ACPI device to remove the notifier from.
+ */
+acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev)
+{
+ return remove_pm_notifier(dev, pci_acpi_wake_bus);
+}
+
+/**
+ * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
+ * @dev: ACPI device to add the notifier for.
+ * @pci_dev: PCI device to check for the PME status if an event is signaled.
+ */
+acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
+ struct pci_dev *pci_dev)
+{
+ return add_pm_notifier(dev, pci_acpi_wake_dev, pci_dev);
+}
+
+/**
+ * pci_acpi_remove_pm_notifier - Unregister PCI device PM notifier.
+ * @dev: ACPI device to remove the notifier from.
+ */
+acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev)
+{
+ return remove_pm_notifier(dev, pci_acpi_wake_dev);
+}
/*
* _SxD returns the D-state with the highest power
* 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)
+static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
+{
+ int acpi_state;
+
+ acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL);
+ if (acpi_state < 0)
+ return PCI_POWER_ERROR;
+
+ switch (acpi_state) {
+ case ACPI_STATE_D0:
+ return PCI_D0;
+ case ACPI_STATE_D1:
+ return PCI_D1;
+ case ACPI_STATE_D2:
+ return PCI_D2;
+ case ACPI_STATE_D3_HOT:
+ return PCI_D3hot;
+ case ACPI_STATE_D3_COLD:
+ return PCI_D3cold;
+ }
+ return PCI_POWER_ERROR;
+}
+
+static bool acpi_pci_power_manageable(struct pci_dev *dev)
{
- char dstate_str[] = "_S0D";
- acpi_status status;
- unsigned long val;
- struct device *dev = &pdev->dev;
-
- /* Fixme: the check is wrong after pm_message_t is a struct */
- if ((state >= PM_SUSPEND_MAX) || !DEVICE_ACPI_HANDLE(dev))
- return -EINVAL;
- dstate_str[2] += state; /* _S1D, _S2D, _S3D, _S4D */
- status = acpi_evaluate_integer(DEVICE_ACPI_HANDLE(dev), dstate_str,
- NULL, &val);
- if (ACPI_SUCCESS(status))
- return val;
- return -ENODEV;
+ acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
+
+ return handle ? acpi_bus_power_manageable(handle) : false;
}
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
+ acpi_handle tmp;
+ static const u8 state_conv[] = {
+ [PCI_D0] = ACPI_STATE_D0,
+ [PCI_D1] = ACPI_STATE_D1,
+ [PCI_D2] = ACPI_STATE_D2,
+ [PCI_D3hot] = ACPI_STATE_D3,
+ [PCI_D3cold] = ACPI_STATE_D3
};
- int acpi_state = state_conv[(int __force) state];
+ int error = -EINVAL;
- if (!handle)
+ /* If the ACPI device has _EJ0, ignore the device */
+ if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
return -ENODEV;
- return acpi_bus_set_power(handle, acpi_state);
+
+ switch (state) {
+ case PCI_D0:
+ case PCI_D1:
+ case PCI_D2:
+ case PCI_D3hot:
+ case PCI_D3cold:
+ error = acpi_bus_set_power(handle, state_conv[state]);
+ }
+
+ if (!error)
+ dev_printk(KERN_INFO, &dev->dev,
+ "power state changed by ACPI to D%d\n", state);
+
+ return error;
+}
+
+static bool acpi_pci_can_wakeup(struct pci_dev *dev)
+{
+ acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
+
+ return handle ? acpi_bus_can_wakeup(handle) : false;
+}
+
+static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
+{
+ while (bus->parent) {
+ if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
+ return;
+ bus = bus->parent;
+ }
+
+ /* We have reached the root bus. */
+ if (bus->bridge)
+ acpi_pm_device_sleep_wake(bus->bridge, enable);
}
+static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
+{
+ if (acpi_pci_can_wakeup(dev))
+ return acpi_pm_device_sleep_wake(&dev->dev, enable);
+
+ acpi_pci_propagate_wakeup_enable(dev->bus, enable);
+ return 0;
+}
+
+static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable)
+{
+ while (bus->parent) {
+ struct pci_dev *bridge = bus->self;
+
+ if (bridge->pme_interrupt)
+ return;
+ if (!acpi_pm_device_run_wake(&bridge->dev, enable))
+ return;
+ bus = bus->parent;
+ }
+
+ /* We have reached the root bus. */
+ if (bus->bridge)
+ acpi_pm_device_run_wake(bus->bridge, enable);
+}
+
+static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
+{
+ if (dev->pme_interrupt)
+ return 0;
+
+ if (!acpi_pm_device_run_wake(&dev->dev, enable))
+ return 0;
+
+ acpi_pci_propagate_run_wake(dev->bus, enable);
+ return 0;
+}
+
+static struct pci_platform_pm_ops acpi_pci_platform_pm = {
+ .is_manageable = acpi_pci_power_manageable,
+ .set_state = acpi_pci_set_power_state,
+ .choose_state = acpi_pci_choose_state,
+ .can_wakeup = acpi_pci_can_wakeup,
+ .sleep_wake = acpi_pci_sleep_wake,
+ .run_wake = acpi_pci_run_wake,
+};
/* ACPI bus type */
-static int pci_acpi_find_device(struct device *dev, acpi_handle *handle)
+static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
{
struct pci_dev * pci_dev;
- acpi_integer addr;
+ u64 addr;
pci_dev = to_pci_dev(dev);
/* Please ref to ACPI spec for the syntax of _ADR */
return 0;
}
-static int pci_acpi_find_root_bridge(struct device *dev, acpi_handle *handle)
+static int acpi_pci_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);
+ num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus);
if (num != 2)
return -ENODEV;
*handle = acpi_get_pci_rootbridge_handle(seg, bus);
return 0;
}
-static struct acpi_bus_type pci_acpi_bus = {
+static struct acpi_bus_type acpi_pci_bus = {
.bus = &pci_bus_type,
- .find_device = pci_acpi_find_device,
- .find_bridge = pci_acpi_find_root_bridge,
+ .find_device = acpi_pci_find_device,
+ .find_bridge = acpi_pci_find_root_bridge,
};
-static int __init pci_acpi_init(void)
+static int __init acpi_pci_init(void)
{
int ret;
- ret = register_acpi_bus_type(&pci_acpi_bus);
+ if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
+ printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
+ pci_no_msi();
+ }
+
+ if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
+ printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
+ pcie_no_aspm();
+ }
+
+ ret = register_acpi_bus_type(&acpi_pci_bus);
if (ret)
return 0;
- platform_pci_choose_state = acpi_pci_choose_state;
- platform_pci_set_power_state = acpi_pci_set_power_state;
+ pci_set_platform_pm(&acpi_pci_platform_pm);
return 0;
}
-arch_initcall(pci_acpi_init);
+arch_initcall(acpi_pci_init);
projects / linux-flexiantxendom0-3.2.10.git / blobdiff