3 * Purpose: Provide PCI support in ACPI
5 * Copyright (C) 2005 David Shaohua Li <shaohua.li@intel.com>
6 * Copyright (C) 2004 Tom Long Nguyen <tom.l.nguyen@intel.com>
7 * Copyright (C) 2004 Intel Corp.
10 #include <linux/delay.h>
11 #include <linux/init.h>
12 #include <linux/pci.h>
13 #include <linux/module.h>
14 #include <linux/pci-aspm.h>
15 #include <acpi/acpi.h>
16 #include <acpi/acnamesp.h>
17 #include <acpi/acresrc.h>
18 #include <acpi/acpi_bus.h>
20 #include <linux/pci-acpi.h>
23 struct acpi_osc_data {
29 struct list_head sibiling;
31 static LIST_HEAD(acpi_osc_data_list);
33 struct acpi_osc_args {
38 static DEFINE_MUTEX(pci_acpi_lock);
40 static struct acpi_osc_data *acpi_get_osc_data(acpi_handle handle)
42 struct acpi_osc_data *data;
44 list_for_each_entry(data, &acpi_osc_data_list, sibiling) {
45 if (data->handle == handle)
48 data = kzalloc(sizeof(*data), GFP_KERNEL);
51 INIT_LIST_HEAD(&data->sibiling);
52 data->handle = handle;
53 list_add_tail(&data->sibiling, &acpi_osc_data_list);
57 static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40,
58 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
60 static acpi_status acpi_run_osc(acpi_handle handle,
61 struct acpi_osc_args *osc_args)
64 struct acpi_object_list input;
65 union acpi_object in_params[4];
66 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
67 union acpi_object *out_obj;
68 u32 errors, flags = osc_args->capbuf[OSC_QUERY_TYPE];
70 /* Setting up input parameters */
72 input.pointer = in_params;
73 in_params[0].type = ACPI_TYPE_BUFFER;
74 in_params[0].buffer.length = 16;
75 in_params[0].buffer.pointer = OSC_UUID;
76 in_params[1].type = ACPI_TYPE_INTEGER;
77 in_params[1].integer.value = 1;
78 in_params[2].type = ACPI_TYPE_INTEGER;
79 in_params[2].integer.value = 3;
80 in_params[3].type = ACPI_TYPE_BUFFER;
81 in_params[3].buffer.length = 12;
82 in_params[3].buffer.pointer = (u8 *)osc_args->capbuf;
84 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
85 if (ACPI_FAILURE(status))
89 return AE_NULL_OBJECT;
91 out_obj = output.pointer;
92 if (out_obj->type != ACPI_TYPE_BUFFER) {
93 printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n");
97 /* Need to ignore the bit0 in result code */
98 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
100 if (errors & OSC_REQUEST_ERROR)
101 printk(KERN_DEBUG "_OSC request fails\n");
102 if (errors & OSC_INVALID_UUID_ERROR)
103 printk(KERN_DEBUG "_OSC invalid UUID\n");
104 if (errors & OSC_INVALID_REVISION_ERROR)
105 printk(KERN_DEBUG "_OSC invalid revision\n");
106 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
107 if (flags & OSC_QUERY_ENABLE)
109 printk(KERN_DEBUG "_OSC FW not grant req. control\n");
117 if (flags & OSC_QUERY_ENABLE)
118 osc_args->query_result =
119 *((u32 *)(out_obj->buffer.pointer + 8));
123 kfree(output.pointer);
127 static acpi_status __acpi_query_osc(u32 flags, struct acpi_osc_data *osc_data)
131 struct acpi_osc_args osc_args;
133 /* do _OSC query for all possible controls */
134 support_set = osc_data->support_set | (flags & OSC_SUPPORT_MASKS);
135 osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
136 osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set;
137 osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
139 status = acpi_run_osc(osc_data->handle, &osc_args);
140 if (ACPI_SUCCESS(status)) {
141 osc_data->support_set = support_set;
142 osc_data->query_result = osc_args.query_result;
143 osc_data->is_queried = 1;
150 * pci_acpi_osc_support: Invoke _OSC indicating support for the given feature
151 * @flags: Bitmask of flags to support
153 * See the ACPI spec for the definition of the flags
155 int pci_acpi_osc_support(acpi_handle handle, u32 flags)
159 struct acpi_osc_data *osc_data;
162 status = acpi_get_handle(handle, "_OSC", &tmp);
163 if (ACPI_FAILURE(status))
166 mutex_lock(&pci_acpi_lock);
167 osc_data = acpi_get_osc_data(handle);
169 printk(KERN_ERR "acpi osc data array is full\n");
174 __acpi_query_osc(flags, osc_data);
176 mutex_unlock(&pci_acpi_lock);
181 * pci_osc_control_set - commit requested control to Firmware
182 * @handle: acpi_handle for the target ACPI object
183 * @flags: driver's requested control bits
185 * Attempt to take control from Firmware on requested control bits.
187 acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
190 u32 ctrlset, control_set;
192 struct acpi_osc_data *osc_data;
193 struct acpi_osc_args osc_args;
195 status = acpi_get_handle(handle, "_OSC", &tmp);
196 if (ACPI_FAILURE(status))
199 mutex_lock(&pci_acpi_lock);
200 osc_data = acpi_get_osc_data(handle);
202 printk(KERN_ERR "acpi osc data array is full\n");
207 ctrlset = (flags & OSC_CONTROL_MASKS);
213 /* No need to evaluate _OSC if the control was already granted. */
214 if ((osc_data->control_set & ctrlset) == ctrlset)
217 if (!osc_data->is_queried) {
218 status = __acpi_query_osc(osc_data->support_set, osc_data);
219 if (ACPI_FAILURE(status))
223 if ((osc_data->query_result & ctrlset) != ctrlset) {
228 control_set = osc_data->control_set | ctrlset;
229 osc_args.capbuf[OSC_QUERY_TYPE] = 0;
230 osc_args.capbuf[OSC_SUPPORT_TYPE] = osc_data->support_set;
231 osc_args.capbuf[OSC_CONTROL_TYPE] = control_set;
232 status = acpi_run_osc(handle, &osc_args);
233 if (ACPI_SUCCESS(status))
234 osc_data->control_set = control_set;
236 mutex_unlock(&pci_acpi_lock);
239 EXPORT_SYMBOL(pci_osc_control_set);
242 * _SxD returns the D-state with the highest power
243 * (lowest D-state number) supported in the S-state "x".
245 * If the devices does not have a _PRW
246 * (Power Resources for Wake) supporting system wakeup from "x"
247 * then the OS is free to choose a lower power (higher number
248 * D-state) than the return value from _SxD.
250 * But if _PRW is enabled at S-state "x", the OS
251 * must not choose a power lower than _SxD --
252 * unless the device has an _SxW method specifying
253 * the lowest power (highest D-state number) the device
254 * may enter while still able to wake the system.
256 * ie. depending on global OS policy:
258 * if (_PRW at S-state x)
259 * choose from highest power _SxD to lowest power _SxW
260 * else // no _PRW at S-state x
261 * choose highest power _SxD or any lower power
264 static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
268 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL);
270 return PCI_POWER_ERROR;
272 switch (acpi_state) {
282 return PCI_POWER_ERROR;
285 static bool acpi_pci_power_manageable(struct pci_dev *dev)
287 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
289 return handle ? acpi_bus_power_manageable(handle) : false;
292 static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
294 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
296 static const u8 state_conv[] = {
297 [PCI_D0] = ACPI_STATE_D0,
298 [PCI_D1] = ACPI_STATE_D1,
299 [PCI_D2] = ACPI_STATE_D2,
300 [PCI_D3hot] = ACPI_STATE_D3,
301 [PCI_D3cold] = ACPI_STATE_D3
305 /* If the ACPI device has _EJ0, ignore the device */
306 if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
315 error = acpi_bus_set_power(handle, state_conv[state]);
319 dev_printk(KERN_INFO, &dev->dev,
320 "power state changed by ACPI to D%d\n", state);
325 static bool acpi_pci_can_wakeup(struct pci_dev *dev)
327 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
329 return handle ? acpi_bus_can_wakeup(handle) : false;
332 static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
334 int error = acpi_pm_device_sleep_wake(&dev->dev, enable);
337 dev_printk(KERN_INFO, &dev->dev,
338 "wake-up capability %s by ACPI\n",
339 enable ? "enabled" : "disabled");
343 static struct pci_platform_pm_ops acpi_pci_platform_pm = {
344 .is_manageable = acpi_pci_power_manageable,
345 .set_state = acpi_pci_set_power_state,
346 .choose_state = acpi_pci_choose_state,
347 .can_wakeup = acpi_pci_can_wakeup,
348 .sleep_wake = acpi_pci_sleep_wake,
352 static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
354 struct pci_dev * pci_dev;
357 pci_dev = to_pci_dev(dev);
358 /* Please ref to ACPI spec for the syntax of _ADR */
359 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
360 *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
366 static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle)
369 unsigned int seg, bus;
372 * The string should be the same as root bridge's name
373 * Please look at 'pci_scan_bus_parented'
375 num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus);
378 *handle = acpi_get_pci_rootbridge_handle(seg, bus);
384 static struct acpi_bus_type acpi_pci_bus = {
385 .bus = &pci_bus_type,
386 .find_device = acpi_pci_find_device,
387 .find_bridge = acpi_pci_find_root_bridge,
390 static int __init acpi_pci_init(void)
394 if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) {
395 printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
399 if (acpi_gbl_FADT.boot_flags & BAF_PCIE_ASPM_CONTROL) {
400 printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
404 ret = register_acpi_bus_type(&acpi_pci_bus);
407 pci_set_platform_pm(&acpi_pci_platform_pm);
410 arch_initcall(acpi_pci_init);