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 osc_dw0, 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))
88 out_obj = output.pointer;
89 if (out_obj->type != ACPI_TYPE_BUFFER) {
90 printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n");
94 osc_dw0 = *((u32 *)out_obj->buffer.pointer);
96 if (osc_dw0 & OSC_REQUEST_ERROR)
97 printk(KERN_DEBUG "_OSC request fails\n");
98 if (osc_dw0 & OSC_INVALID_UUID_ERROR)
99 printk(KERN_DEBUG "_OSC invalid UUID\n");
100 if (osc_dw0 & OSC_INVALID_REVISION_ERROR)
101 printk(KERN_DEBUG "_OSC invalid revision\n");
102 if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) {
103 if (flags & OSC_QUERY_ENABLE)
105 printk(KERN_DEBUG "_OSC FW not grant req. control\n");
113 if (flags & OSC_QUERY_ENABLE)
114 osc_args->query_result =
115 *((u32 *)(out_obj->buffer.pointer + 8));
119 kfree(output.pointer);
123 static acpi_status acpi_query_osc(acpi_handle handle,
124 u32 level, void *context, void **retval)
127 struct acpi_osc_data *osc_data;
128 u32 flags = (unsigned long)context, support_set;
130 struct acpi_osc_args osc_args;
132 status = acpi_get_handle(handle, "_OSC", &tmp);
133 if (ACPI_FAILURE(status))
136 mutex_lock(&pci_acpi_lock);
137 osc_data = acpi_get_osc_data(handle);
139 printk(KERN_ERR "acpi osc data array is full\n");
144 /* do _OSC query for all possible controls */
145 support_set = osc_data->support_set | (flags & OSC_SUPPORT_MASKS);
146 osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
147 osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set;
148 osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
150 status = acpi_run_osc(handle, &osc_args);
151 if (ACPI_SUCCESS(status)) {
152 osc_data->support_set = support_set;
153 osc_data->query_result = osc_args.query_result;
154 osc_data->is_queried = 1;
157 mutex_unlock(&pci_acpi_lock);
162 * __pci_osc_support_set - register OS support to Firmware
163 * @flags: OS support bits
166 * Update OS support fields and doing a _OSC Query to obtain an update
167 * from Firmware on supported control bits.
169 acpi_status __pci_osc_support_set(u32 flags, const char *hid)
171 if (!(flags & OSC_SUPPORT_MASKS))
174 acpi_get_devices(hid, acpi_query_osc,
175 (void *)(unsigned long)flags, NULL);
180 * pci_osc_control_set - commit requested control to Firmware
181 * @handle: acpi_handle for the target ACPI object
182 * @flags: driver's requested control bits
184 * Attempt to take control from Firmware on requested control bits.
186 acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
189 u32 ctrlset, control_set;
191 struct acpi_osc_data *osc_data;
192 struct acpi_osc_args osc_args;
194 status = acpi_get_handle(handle, "_OSC", &tmp);
195 if (ACPI_FAILURE(status))
198 mutex_lock(&pci_acpi_lock);
199 osc_data = acpi_get_osc_data(handle);
201 printk(KERN_ERR "acpi osc data array is full\n");
206 ctrlset = (flags & OSC_CONTROL_MASKS);
212 if (osc_data->is_queried &&
213 ((osc_data->query_result & ctrlset) != ctrlset)) {
218 control_set = osc_data->control_set | ctrlset;
219 osc_args.capbuf[OSC_QUERY_TYPE] = 0;
220 osc_args.capbuf[OSC_SUPPORT_TYPE] = osc_data->support_set;
221 osc_args.capbuf[OSC_CONTROL_TYPE] = control_set;
222 status = acpi_run_osc(handle, &osc_args);
223 if (ACPI_SUCCESS(status))
224 osc_data->control_set = control_set;
226 mutex_unlock(&pci_acpi_lock);
229 EXPORT_SYMBOL(pci_osc_control_set);
232 * _SxD returns the D-state with the highest power
233 * (lowest D-state number) supported in the S-state "x".
235 * If the devices does not have a _PRW
236 * (Power Resources for Wake) supporting system wakeup from "x"
237 * then the OS is free to choose a lower power (higher number
238 * D-state) than the return value from _SxD.
240 * But if _PRW is enabled at S-state "x", the OS
241 * must not choose a power lower than _SxD --
242 * unless the device has an _SxW method specifying
243 * the lowest power (highest D-state number) the device
244 * may enter while still able to wake the system.
246 * ie. depending on global OS policy:
248 * if (_PRW at S-state x)
249 * choose from highest power _SxD to lowest power _SxW
250 * else // no _PRW at S-state x
251 * choose highest power _SxD or any lower power
254 static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
258 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL);
260 return PCI_POWER_ERROR;
262 switch (acpi_state) {
272 return PCI_POWER_ERROR;
275 static bool acpi_pci_power_manageable(struct pci_dev *dev)
277 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
279 return handle ? acpi_bus_power_manageable(handle) : false;
282 static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
284 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
286 static const u8 state_conv[] = {
287 [PCI_D0] = ACPI_STATE_D0,
288 [PCI_D1] = ACPI_STATE_D1,
289 [PCI_D2] = ACPI_STATE_D2,
290 [PCI_D3hot] = ACPI_STATE_D3,
291 [PCI_D3cold] = ACPI_STATE_D3
295 /* If the ACPI device has _EJ0, ignore the device */
296 if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
305 error = acpi_bus_set_power(handle, state_conv[state]);
309 dev_printk(KERN_INFO, &dev->dev,
310 "power state changed by ACPI to D%d\n", state);
315 static bool acpi_pci_can_wakeup(struct pci_dev *dev)
317 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
319 return handle ? acpi_bus_can_wakeup(handle) : false;
322 static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
324 int error = acpi_pm_device_sleep_wake(&dev->dev, enable);
327 dev_printk(KERN_INFO, &dev->dev,
328 "wake-up capability %s by ACPI\n",
329 enable ? "enabled" : "disabled");
333 static struct pci_platform_pm_ops acpi_pci_platform_pm = {
334 .is_manageable = acpi_pci_power_manageable,
335 .set_state = acpi_pci_set_power_state,
336 .choose_state = acpi_pci_choose_state,
337 .can_wakeup = acpi_pci_can_wakeup,
338 .sleep_wake = acpi_pci_sleep_wake,
342 static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
344 struct pci_dev * pci_dev;
347 pci_dev = to_pci_dev(dev);
348 /* Please ref to ACPI spec for the syntax of _ADR */
349 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
350 *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
356 static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle)
359 unsigned int seg, bus;
362 * The string should be the same as root bridge's name
363 * Please look at 'pci_scan_bus_parented'
365 num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus);
368 *handle = acpi_get_pci_rootbridge_handle(seg, bus);
374 static struct acpi_bus_type acpi_pci_bus = {
375 .bus = &pci_bus_type,
376 .find_device = acpi_pci_find_device,
377 .find_bridge = acpi_pci_find_root_bridge,
380 static int __init acpi_pci_init(void)
384 if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) {
385 printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
389 if (acpi_gbl_FADT.boot_flags & BAF_PCIE_ASPM_CONTROL) {
390 printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
394 ret = register_acpi_bus_type(&acpi_pci_bus);
397 pci_set_platform_pm(&acpi_pci_platform_pm);
400 arch_initcall(acpi_pci_init);