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/acpi_bus.h>
18 #include <linux/pci-acpi.h>
21 struct acpi_osc_data {
27 struct list_head sibiling;
29 static LIST_HEAD(acpi_osc_data_list);
31 struct acpi_osc_args {
35 static DEFINE_MUTEX(pci_acpi_lock);
37 static struct acpi_osc_data *acpi_get_osc_data(acpi_handle handle)
39 struct acpi_osc_data *data;
41 list_for_each_entry(data, &acpi_osc_data_list, sibiling) {
42 if (data->handle == handle)
45 data = kzalloc(sizeof(*data), GFP_KERNEL);
48 INIT_LIST_HEAD(&data->sibiling);
49 data->handle = handle;
50 list_add_tail(&data->sibiling, &acpi_osc_data_list);
54 static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40,
55 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
57 static acpi_status acpi_run_osc(acpi_handle handle,
58 struct acpi_osc_args *osc_args, u32 *retval)
61 struct acpi_object_list input;
62 union acpi_object in_params[4];
63 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
64 union acpi_object *out_obj;
65 u32 errors, flags = osc_args->capbuf[OSC_QUERY_TYPE];
67 /* Setting up input parameters */
69 input.pointer = in_params;
70 in_params[0].type = ACPI_TYPE_BUFFER;
71 in_params[0].buffer.length = 16;
72 in_params[0].buffer.pointer = OSC_UUID;
73 in_params[1].type = ACPI_TYPE_INTEGER;
74 in_params[1].integer.value = 1;
75 in_params[2].type = ACPI_TYPE_INTEGER;
76 in_params[2].integer.value = 3;
77 in_params[3].type = ACPI_TYPE_BUFFER;
78 in_params[3].buffer.length = 12;
79 in_params[3].buffer.pointer = (u8 *)osc_args->capbuf;
81 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
82 if (ACPI_FAILURE(status))
86 return AE_NULL_OBJECT;
88 out_obj = output.pointer;
89 if (out_obj->type != ACPI_TYPE_BUFFER) {
90 printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n");
94 /* Need to ignore the bit0 in result code */
95 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
97 if (errors & OSC_REQUEST_ERROR)
98 printk(KERN_DEBUG "_OSC request fails\n");
99 if (errors & OSC_INVALID_UUID_ERROR)
100 printk(KERN_DEBUG "_OSC invalid UUID\n");
101 if (errors & OSC_INVALID_REVISION_ERROR)
102 printk(KERN_DEBUG "_OSC invalid revision\n");
103 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
104 if (flags & OSC_QUERY_ENABLE)
106 printk(KERN_DEBUG "_OSC FW not grant req. control\n");
114 *retval = *((u32 *)(out_obj->buffer.pointer + 8));
118 kfree(output.pointer);
122 static acpi_status __acpi_query_osc(u32 flags, struct acpi_osc_data *osc_data)
125 u32 support_set, result;
126 struct acpi_osc_args osc_args;
128 /* do _OSC query for all possible controls */
129 support_set = osc_data->support_set | (flags & OSC_SUPPORT_MASKS);
130 osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
131 osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set;
132 osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
134 status = acpi_run_osc(osc_data->handle, &osc_args, &result);
135 if (ACPI_SUCCESS(status)) {
136 osc_data->support_set = support_set;
137 osc_data->control_query = result;
138 osc_data->is_queried = 1;
145 * pci_acpi_osc_support: Invoke _OSC indicating support for the given feature
146 * @flags: Bitmask of flags to support
148 * See the ACPI spec for the definition of the flags
150 int pci_acpi_osc_support(acpi_handle handle, u32 flags)
154 struct acpi_osc_data *osc_data;
157 status = acpi_get_handle(handle, "_OSC", &tmp);
158 if (ACPI_FAILURE(status))
161 mutex_lock(&pci_acpi_lock);
162 osc_data = acpi_get_osc_data(handle);
164 printk(KERN_ERR "acpi osc data array is full\n");
169 __acpi_query_osc(flags, osc_data);
171 mutex_unlock(&pci_acpi_lock);
176 * pci_osc_control_set - commit requested control to Firmware
177 * @handle: acpi_handle for the target ACPI object
178 * @flags: driver's requested control bits
180 * Attempt to take control from Firmware on requested control bits.
182 acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
185 u32 control_req, control_set, result;
187 struct acpi_osc_data *osc_data;
188 struct acpi_osc_args osc_args;
190 status = acpi_get_handle(handle, "_OSC", &tmp);
191 if (ACPI_FAILURE(status))
194 mutex_lock(&pci_acpi_lock);
195 osc_data = acpi_get_osc_data(handle);
197 printk(KERN_ERR "acpi osc data array is full\n");
202 control_req = (flags & OSC_CONTROL_MASKS);
208 /* No need to evaluate _OSC if the control was already granted. */
209 if ((osc_data->control_set & control_req) == control_req)
212 if (!osc_data->is_queried) {
213 status = __acpi_query_osc(osc_data->support_set, osc_data);
214 if (ACPI_FAILURE(status))
218 if ((osc_data->control_query & control_req) != control_req) {
223 control_set = osc_data->control_set | control_req;
224 osc_args.capbuf[OSC_QUERY_TYPE] = 0;
225 osc_args.capbuf[OSC_SUPPORT_TYPE] = osc_data->support_set;
226 osc_args.capbuf[OSC_CONTROL_TYPE] = control_set;
227 status = acpi_run_osc(handle, &osc_args, &result);
228 if (ACPI_SUCCESS(status))
229 osc_data->control_set = result;
231 mutex_unlock(&pci_acpi_lock);
234 EXPORT_SYMBOL(pci_osc_control_set);
237 * _SxD returns the D-state with the highest power
238 * (lowest D-state number) supported in the S-state "x".
240 * If the devices does not have a _PRW
241 * (Power Resources for Wake) supporting system wakeup from "x"
242 * then the OS is free to choose a lower power (higher number
243 * D-state) than the return value from _SxD.
245 * But if _PRW is enabled at S-state "x", the OS
246 * must not choose a power lower than _SxD --
247 * unless the device has an _SxW method specifying
248 * the lowest power (highest D-state number) the device
249 * may enter while still able to wake the system.
251 * ie. depending on global OS policy:
253 * if (_PRW at S-state x)
254 * choose from highest power _SxD to lowest power _SxW
255 * else // no _PRW at S-state x
256 * choose highest power _SxD or any lower power
259 static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
263 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL);
265 return PCI_POWER_ERROR;
267 switch (acpi_state) {
277 return PCI_POWER_ERROR;
280 static bool acpi_pci_power_manageable(struct pci_dev *dev)
282 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
284 return handle ? acpi_bus_power_manageable(handle) : false;
287 static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
289 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
291 static const u8 state_conv[] = {
292 [PCI_D0] = ACPI_STATE_D0,
293 [PCI_D1] = ACPI_STATE_D1,
294 [PCI_D2] = ACPI_STATE_D2,
295 [PCI_D3hot] = ACPI_STATE_D3,
296 [PCI_D3cold] = ACPI_STATE_D3
300 /* If the ACPI device has _EJ0, ignore the device */
301 if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
310 error = acpi_bus_set_power(handle, state_conv[state]);
314 dev_printk(KERN_INFO, &dev->dev,
315 "power state changed by ACPI to D%d\n", state);
320 static bool acpi_pci_can_wakeup(struct pci_dev *dev)
322 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
324 return handle ? acpi_bus_can_wakeup(handle) : false;
327 static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
329 int error = acpi_pm_device_sleep_wake(&dev->dev, enable);
332 dev_printk(KERN_INFO, &dev->dev,
333 "wake-up capability %s by ACPI\n",
334 enable ? "enabled" : "disabled");
338 static struct pci_platform_pm_ops acpi_pci_platform_pm = {
339 .is_manageable = acpi_pci_power_manageable,
340 .set_state = acpi_pci_set_power_state,
341 .choose_state = acpi_pci_choose_state,
342 .can_wakeup = acpi_pci_can_wakeup,
343 .sleep_wake = acpi_pci_sleep_wake,
347 static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
349 struct pci_dev * pci_dev;
352 pci_dev = to_pci_dev(dev);
353 /* Please ref to ACPI spec for the syntax of _ADR */
354 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
355 *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
361 static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle)
364 unsigned int seg, bus;
367 * The string should be the same as root bridge's name
368 * Please look at 'pci_scan_bus_parented'
370 num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus);
373 *handle = acpi_get_pci_rootbridge_handle(seg, bus);
379 static struct acpi_bus_type acpi_pci_bus = {
380 .bus = &pci_bus_type,
381 .find_device = acpi_pci_find_device,
382 .find_bridge = acpi_pci_find_root_bridge,
385 static int __init acpi_pci_init(void)
389 if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) {
390 printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
394 if (acpi_gbl_FADT.boot_flags & BAF_PCIE_ASPM_CONTROL) {
395 printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
399 ret = register_acpi_bus_type(&acpi_pci_bus);
402 pci_set_platform_pm(&acpi_pci_platform_pm);
405 arch_initcall(acpi_pci_init);