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 {
25 struct list_head sibiling;
27 static LIST_HEAD(acpi_osc_data_list);
29 struct acpi_osc_args {
34 static DEFINE_MUTEX(pci_acpi_lock);
36 static struct acpi_osc_data *acpi_get_osc_data(acpi_handle handle)
38 struct acpi_osc_data *data;
40 list_for_each_entry(data, &acpi_osc_data_list, sibiling) {
41 if (data->handle == handle)
44 data = kzalloc(sizeof(*data), GFP_KERNEL);
47 INIT_LIST_HEAD(&data->sibiling);
48 data->handle = handle;
49 list_add_tail(&data->sibiling, &acpi_osc_data_list);
53 static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40,
54 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
56 static acpi_status acpi_run_osc(acpi_handle handle,
57 struct acpi_osc_args *osc_args)
60 struct acpi_object_list input;
61 union acpi_object in_params[4];
62 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
63 union acpi_object *out_obj;
64 u32 errors, flags = osc_args->capbuf[OSC_QUERY_TYPE];
66 /* Setting up input parameters */
68 input.pointer = in_params;
69 in_params[0].type = ACPI_TYPE_BUFFER;
70 in_params[0].buffer.length = 16;
71 in_params[0].buffer.pointer = OSC_UUID;
72 in_params[1].type = ACPI_TYPE_INTEGER;
73 in_params[1].integer.value = 1;
74 in_params[2].type = ACPI_TYPE_INTEGER;
75 in_params[2].integer.value = 3;
76 in_params[3].type = ACPI_TYPE_BUFFER;
77 in_params[3].buffer.length = 12;
78 in_params[3].buffer.pointer = (u8 *)osc_args->capbuf;
80 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
81 if (ACPI_FAILURE(status))
85 return AE_NULL_OBJECT;
87 out_obj = output.pointer;
88 if (out_obj->type != ACPI_TYPE_BUFFER) {
89 printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n");
93 /* Need to ignore the bit0 in result code */
94 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
96 if (errors & OSC_REQUEST_ERROR)
97 printk(KERN_DEBUG "_OSC request fails\n");
98 if (errors & OSC_INVALID_UUID_ERROR)
99 printk(KERN_DEBUG "_OSC invalid UUID\n");
100 if (errors & OSC_INVALID_REVISION_ERROR)
101 printk(KERN_DEBUG "_OSC invalid revision\n");
102 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
103 if (flags & OSC_QUERY_ENABLE)
105 printk(KERN_DEBUG "_OSC FW not grant req. control\n");
113 osc_args->ctrl_result =
114 *((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,
127 struct acpi_osc_args osc_args;
129 /* do _OSC query for all possible controls */
130 support_set = osc_data->support_set | (flags & OSC_SUPPORT_MASKS);
131 osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
132 osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set;
133 osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
135 status = acpi_run_osc(osc_data->handle, &osc_args);
136 if (ACPI_SUCCESS(status)) {
137 osc_data->support_set = support_set;
138 *result = osc_args.ctrl_result;
144 static acpi_status acpi_query_osc(acpi_handle handle,
145 u32 level, void *context, void **retval)
148 struct acpi_osc_data *osc_data;
149 u32 flags = (unsigned long)context, dummy;
152 status = acpi_get_handle(handle, "_OSC", &tmp);
153 if (ACPI_FAILURE(status))
156 mutex_lock(&pci_acpi_lock);
157 osc_data = acpi_get_osc_data(handle);
159 printk(KERN_ERR "acpi osc data array is full\n");
163 __acpi_query_osc(flags, osc_data, &dummy);
165 mutex_unlock(&pci_acpi_lock);
170 * __pci_osc_support_set - register OS support to Firmware
171 * @flags: OS support bits
174 * Update OS support fields and doing a _OSC Query to obtain an update
175 * from Firmware on supported control bits.
177 acpi_status __pci_osc_support_set(u32 flags, const char *hid)
179 if (!(flags & OSC_SUPPORT_MASKS))
182 acpi_get_devices(hid, acpi_query_osc,
183 (void *)(unsigned long)flags, NULL);
188 * pci_osc_control_set - commit requested control to Firmware
189 * @handle: acpi_handle for the target ACPI object
190 * @flags: driver's requested control bits
192 * Attempt to take control from Firmware on requested control bits.
194 acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
197 u32 ctrlset, control_set, result;
199 struct acpi_osc_data *osc_data;
200 struct acpi_osc_args osc_args;
202 status = acpi_get_handle(handle, "_OSC", &tmp);
203 if (ACPI_FAILURE(status))
206 mutex_lock(&pci_acpi_lock);
207 osc_data = acpi_get_osc_data(handle);
209 printk(KERN_ERR "acpi osc data array is full\n");
214 ctrlset = (flags & OSC_CONTROL_MASKS);
220 status = __acpi_query_osc(osc_data->support_set, osc_data, &result);
221 if (ACPI_FAILURE(status))
224 if ((result & ctrlset) != ctrlset) {
229 control_set = osc_data->control_set | ctrlset;
230 osc_args.capbuf[OSC_QUERY_TYPE] = 0;
231 osc_args.capbuf[OSC_SUPPORT_TYPE] = osc_data->support_set;
232 osc_args.capbuf[OSC_CONTROL_TYPE] = control_set;
233 status = acpi_run_osc(handle, &osc_args);
234 if (ACPI_SUCCESS(status))
235 osc_data->control_set = control_set;
237 mutex_unlock(&pci_acpi_lock);
240 EXPORT_SYMBOL(pci_osc_control_set);
243 * _SxD returns the D-state with the highest power
244 * (lowest D-state number) supported in the S-state "x".
246 * If the devices does not have a _PRW
247 * (Power Resources for Wake) supporting system wakeup from "x"
248 * then the OS is free to choose a lower power (higher number
249 * D-state) than the return value from _SxD.
251 * But if _PRW is enabled at S-state "x", the OS
252 * must not choose a power lower than _SxD --
253 * unless the device has an _SxW method specifying
254 * the lowest power (highest D-state number) the device
255 * may enter while still able to wake the system.
257 * ie. depending on global OS policy:
259 * if (_PRW at S-state x)
260 * choose from highest power _SxD to lowest power _SxW
261 * else // no _PRW at S-state x
262 * choose highest power _SxD or any lower power
265 static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
269 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL);
271 return PCI_POWER_ERROR;
273 switch (acpi_state) {
283 return PCI_POWER_ERROR;
286 static bool acpi_pci_power_manageable(struct pci_dev *dev)
288 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
290 return handle ? acpi_bus_power_manageable(handle) : false;
293 static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
295 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
297 static const u8 state_conv[] = {
298 [PCI_D0] = ACPI_STATE_D0,
299 [PCI_D1] = ACPI_STATE_D1,
300 [PCI_D2] = ACPI_STATE_D2,
301 [PCI_D3hot] = ACPI_STATE_D3,
302 [PCI_D3cold] = ACPI_STATE_D3
306 /* If the ACPI device has _EJ0, ignore the device */
307 if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
316 error = acpi_bus_set_power(handle, state_conv[state]);
320 dev_printk(KERN_INFO, &dev->dev,
321 "power state changed by ACPI to D%d\n", state);
326 static bool acpi_pci_can_wakeup(struct pci_dev *dev)
328 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
330 return handle ? acpi_bus_can_wakeup(handle) : false;
333 static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
335 int error = acpi_pm_device_sleep_wake(&dev->dev, enable);
338 dev_printk(KERN_INFO, &dev->dev,
339 "wake-up capability %s by ACPI\n",
340 enable ? "enabled" : "disabled");
344 static struct pci_platform_pm_ops acpi_pci_platform_pm = {
345 .is_manageable = acpi_pci_power_manageable,
346 .set_state = acpi_pci_set_power_state,
347 .choose_state = acpi_pci_choose_state,
348 .can_wakeup = acpi_pci_can_wakeup,
349 .sleep_wake = acpi_pci_sleep_wake,
353 static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
355 struct pci_dev * pci_dev;
358 pci_dev = to_pci_dev(dev);
359 /* Please ref to ACPI spec for the syntax of _ADR */
360 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
361 *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
367 static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle)
370 unsigned int seg, bus;
373 * The string should be the same as root bridge's name
374 * Please look at 'pci_scan_bus_parented'
376 num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus);
379 *handle = acpi_get_pci_rootbridge_handle(seg, bus);
385 static struct acpi_bus_type acpi_pci_bus = {
386 .bus = &pci_bus_type,
387 .find_device = acpi_pci_find_device,
388 .find_bridge = acpi_pci_find_root_bridge,
391 static int __init acpi_pci_init(void)
395 if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) {
396 printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
400 if (acpi_gbl_FADT.boot_flags & BAF_PCIE_ASPM_CONTROL) {
401 printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
405 ret = register_acpi_bus_type(&acpi_pci_bus);
408 pci_set_platform_pm(&acpi_pci_platform_pm);
411 arch_initcall(acpi_pci_init);