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 <acpi/acpi.h>
15 #include <acpi/acnamesp.h>
16 #include <acpi/acresrc.h>
17 #include <acpi/acpi_bus.h>
19 #include <linux/pci-acpi.h>
22 struct acpi_osc_data {
28 struct list_head sibiling;
30 static LIST_HEAD(acpi_osc_data_list);
32 struct acpi_osc_args {
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)
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 osc_dw0, 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))
85 out_obj = output.pointer;
86 if (out_obj->type != ACPI_TYPE_BUFFER) {
87 printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n");
91 osc_dw0 = *((u32 *)out_obj->buffer.pointer);
93 if (osc_dw0 & OSC_REQUEST_ERROR)
94 printk(KERN_DEBUG "_OSC request fails\n");
95 if (osc_dw0 & OSC_INVALID_UUID_ERROR)
96 printk(KERN_DEBUG "_OSC invalid UUID\n");
97 if (osc_dw0 & OSC_INVALID_REVISION_ERROR)
98 printk(KERN_DEBUG "_OSC invalid revision\n");
99 if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) {
100 if (flags & OSC_QUERY_ENABLE)
102 printk(KERN_DEBUG "_OSC FW not grant req. control\n");
110 if (flags & OSC_QUERY_ENABLE)
111 osc_args->query_result =
112 *((u32 *)(out_obj->buffer.pointer + 8));
116 kfree(output.pointer);
120 static acpi_status acpi_query_osc(acpi_handle handle,
121 u32 level, void *context, void **retval)
124 struct acpi_osc_data *osc_data;
125 u32 flags = (unsigned long)context, support_set;
127 struct acpi_osc_args osc_args;
129 status = acpi_get_handle(handle, "_OSC", &tmp);
130 if (ACPI_FAILURE(status))
133 osc_data = acpi_get_osc_data(handle);
135 printk(KERN_ERR "acpi osc data array is full\n");
139 /* do _OSC query for all possible controls */
140 support_set = osc_data->support_set | (flags & OSC_SUPPORT_MASKS);
141 osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
142 osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set;
143 osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
145 status = acpi_run_osc(handle, &osc_args);
146 if (ACPI_SUCCESS(status)) {
147 osc_data->support_set = support_set;
148 osc_data->query_result = osc_args.query_result;
149 osc_data->is_queried = 1;
156 * __pci_osc_support_set - register OS support to Firmware
157 * @flags: OS support bits
160 * Update OS support fields and doing a _OSC Query to obtain an update
161 * from Firmware on supported control bits.
163 acpi_status __pci_osc_support_set(u32 flags, const char *hid)
165 if (!(flags & OSC_SUPPORT_MASKS))
168 acpi_get_devices(hid, acpi_query_osc,
169 (void *)(unsigned long)flags, NULL);
174 * pci_osc_control_set - commit requested control to Firmware
175 * @handle: acpi_handle for the target ACPI object
176 * @flags: driver's requested control bits
178 * Attempt to take control from Firmware on requested control bits.
180 acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
183 u32 ctrlset, control_set;
185 struct acpi_osc_data *osc_data;
186 struct acpi_osc_args osc_args;
188 status = acpi_get_handle(handle, "_OSC", &tmp);
189 if (ACPI_FAILURE(status))
192 osc_data = acpi_get_osc_data(handle);
194 printk(KERN_ERR "acpi osc data array is full\n");
198 ctrlset = (flags & OSC_CONTROL_MASKS);
202 if (osc_data->is_queried &&
203 ((osc_data->query_result & ctrlset) != ctrlset))
206 control_set = osc_data->control_set | ctrlset;
207 osc_args.capbuf[OSC_QUERY_TYPE] = 0;
208 osc_args.capbuf[OSC_SUPPORT_TYPE] = osc_data->support_set;
209 osc_args.capbuf[OSC_CONTROL_TYPE] = control_set;
210 status = acpi_run_osc(handle, &osc_args);
211 if (ACPI_SUCCESS(status))
212 osc_data->control_set = control_set;
216 EXPORT_SYMBOL(pci_osc_control_set);
219 * _SxD returns the D-state with the highest power
220 * (lowest D-state number) supported in the S-state "x".
222 * If the devices does not have a _PRW
223 * (Power Resources for Wake) supporting system wakeup from "x"
224 * then the OS is free to choose a lower power (higher number
225 * D-state) than the return value from _SxD.
227 * But if _PRW is enabled at S-state "x", the OS
228 * must not choose a power lower than _SxD --
229 * unless the device has an _SxW method specifying
230 * the lowest power (highest D-state number) the device
231 * may enter while still able to wake the system.
233 * ie. depending on global OS policy:
235 * if (_PRW at S-state x)
236 * choose from highest power _SxD to lowest power _SxW
237 * else // no _PRW at S-state x
238 * choose highest power _SxD or any lower power
241 static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
245 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL);
247 return PCI_POWER_ERROR;
249 switch (acpi_state) {
259 return PCI_POWER_ERROR;
262 static bool acpi_pci_power_manageable(struct pci_dev *dev)
264 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
266 return handle ? acpi_bus_power_manageable(handle) : false;
269 static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
271 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
273 static const u8 state_conv[] = {
274 [PCI_D0] = ACPI_STATE_D0,
275 [PCI_D1] = ACPI_STATE_D1,
276 [PCI_D2] = ACPI_STATE_D2,
277 [PCI_D3hot] = ACPI_STATE_D3,
278 [PCI_D3cold] = ACPI_STATE_D3
282 /* If the ACPI device has _EJ0, ignore the device */
283 if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
292 error = acpi_bus_set_power(handle, state_conv[state]);
296 dev_printk(KERN_INFO, &dev->dev,
297 "power state changed by ACPI to D%d\n", state);
302 static bool acpi_pci_can_wakeup(struct pci_dev *dev)
304 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
306 return handle ? acpi_bus_can_wakeup(handle) : false;
309 static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
311 int error = acpi_pm_device_sleep_wake(&dev->dev, enable);
314 dev_printk(KERN_INFO, &dev->dev,
315 "wake-up capability %s by ACPI\n",
316 enable ? "enabled" : "disabled");
320 static struct pci_platform_pm_ops acpi_pci_platform_pm = {
321 .is_manageable = acpi_pci_power_manageable,
322 .set_state = acpi_pci_set_power_state,
323 .choose_state = acpi_pci_choose_state,
324 .can_wakeup = acpi_pci_can_wakeup,
325 .sleep_wake = acpi_pci_sleep_wake,
329 static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
331 struct pci_dev * pci_dev;
334 pci_dev = to_pci_dev(dev);
335 /* Please ref to ACPI spec for the syntax of _ADR */
336 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
337 *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
343 static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle)
346 unsigned int seg, bus;
349 * The string should be the same as root bridge's name
350 * Please look at 'pci_scan_bus_parented'
352 num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus);
355 *handle = acpi_get_pci_rootbridge_handle(seg, bus);
361 static struct acpi_bus_type acpi_pci_bus = {
362 .bus = &pci_bus_type,
363 .find_device = acpi_pci_find_device,
364 .find_bridge = acpi_pci_find_root_bridge,
367 static int __init acpi_pci_init(void)
371 if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) {
372 printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
375 ret = register_acpi_bus_type(&acpi_pci_bus);
378 pci_set_platform_pm(&acpi_pci_platform_pm);
381 arch_initcall(acpi_pci_init);