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 {
37 static DEFINE_MUTEX(pci_acpi_lock);
39 static struct acpi_osc_data *acpi_get_osc_data(acpi_handle handle)
41 struct acpi_osc_data *data;
43 list_for_each_entry(data, &acpi_osc_data_list, sibiling) {
44 if (data->handle == handle)
47 data = kzalloc(sizeof(*data), GFP_KERNEL);
50 INIT_LIST_HEAD(&data->sibiling);
51 data->handle = handle;
52 list_add_tail(&data->sibiling, &acpi_osc_data_list);
56 static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40,
57 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
59 static acpi_status acpi_run_osc(acpi_handle handle,
60 struct acpi_osc_args *osc_args, u32 *retval)
63 struct acpi_object_list input;
64 union acpi_object in_params[4];
65 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
66 union acpi_object *out_obj;
67 u32 errors, flags = osc_args->capbuf[OSC_QUERY_TYPE];
69 /* Setting up input parameters */
71 input.pointer = in_params;
72 in_params[0].type = ACPI_TYPE_BUFFER;
73 in_params[0].buffer.length = 16;
74 in_params[0].buffer.pointer = OSC_UUID;
75 in_params[1].type = ACPI_TYPE_INTEGER;
76 in_params[1].integer.value = 1;
77 in_params[2].type = ACPI_TYPE_INTEGER;
78 in_params[2].integer.value = 3;
79 in_params[3].type = ACPI_TYPE_BUFFER;
80 in_params[3].buffer.length = 12;
81 in_params[3].buffer.pointer = (u8 *)osc_args->capbuf;
83 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
84 if (ACPI_FAILURE(status))
88 return AE_NULL_OBJECT;
90 out_obj = output.pointer;
91 if (out_obj->type != ACPI_TYPE_BUFFER) {
92 printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n");
96 /* Need to ignore the bit0 in result code */
97 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
99 if (errors & OSC_REQUEST_ERROR)
100 printk(KERN_DEBUG "_OSC request fails\n");
101 if (errors & OSC_INVALID_UUID_ERROR)
102 printk(KERN_DEBUG "_OSC invalid UUID\n");
103 if (errors & OSC_INVALID_REVISION_ERROR)
104 printk(KERN_DEBUG "_OSC invalid revision\n");
105 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
106 if (flags & OSC_QUERY_ENABLE)
108 printk(KERN_DEBUG "_OSC FW not grant req. control\n");
116 *retval = *((u32 *)(out_obj->buffer.pointer + 8));
120 kfree(output.pointer);
124 static acpi_status __acpi_query_osc(u32 flags, struct acpi_osc_data *osc_data)
127 u32 support_set, result;
128 struct acpi_osc_args osc_args;
130 /* do _OSC query for all possible controls */
131 support_set = osc_data->support_set | (flags & OSC_SUPPORT_MASKS);
132 osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
133 osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set;
134 osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
136 status = acpi_run_osc(osc_data->handle, &osc_args, &result);
137 if (ACPI_SUCCESS(status)) {
138 osc_data->support_set = support_set;
139 osc_data->control_query = result;
140 osc_data->is_queried = 1;
147 * pci_acpi_osc_support: Invoke _OSC indicating support for the given feature
148 * @flags: Bitmask of flags to support
150 * See the ACPI spec for the definition of the flags
152 int pci_acpi_osc_support(acpi_handle handle, u32 flags)
156 struct acpi_osc_data *osc_data;
159 status = acpi_get_handle(handle, "_OSC", &tmp);
160 if (ACPI_FAILURE(status))
163 mutex_lock(&pci_acpi_lock);
164 osc_data = acpi_get_osc_data(handle);
166 printk(KERN_ERR "acpi osc data array is full\n");
171 __acpi_query_osc(flags, osc_data);
173 mutex_unlock(&pci_acpi_lock);
178 * pci_osc_control_set - commit requested control to Firmware
179 * @handle: acpi_handle for the target ACPI object
180 * @flags: driver's requested control bits
182 * Attempt to take control from Firmware on requested control bits.
184 acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
187 u32 control_req, control_set, result;
189 struct acpi_osc_data *osc_data;
190 struct acpi_osc_args osc_args;
192 status = acpi_get_handle(handle, "_OSC", &tmp);
193 if (ACPI_FAILURE(status))
196 mutex_lock(&pci_acpi_lock);
197 osc_data = acpi_get_osc_data(handle);
199 printk(KERN_ERR "acpi osc data array is full\n");
204 control_req = (flags & OSC_CONTROL_MASKS);
210 /* No need to evaluate _OSC if the control was already granted. */
211 if ((osc_data->control_set & control_req) == control_req)
214 if (!osc_data->is_queried) {
215 status = __acpi_query_osc(osc_data->support_set, osc_data);
216 if (ACPI_FAILURE(status))
220 if ((osc_data->control_query & control_req) != control_req) {
225 control_set = osc_data->control_set | control_req;
226 osc_args.capbuf[OSC_QUERY_TYPE] = 0;
227 osc_args.capbuf[OSC_SUPPORT_TYPE] = osc_data->support_set;
228 osc_args.capbuf[OSC_CONTROL_TYPE] = control_set;
229 status = acpi_run_osc(handle, &osc_args, &result);
230 if (ACPI_SUCCESS(status))
231 osc_data->control_set = result;
233 mutex_unlock(&pci_acpi_lock);
236 EXPORT_SYMBOL(pci_osc_control_set);
239 * _SxD returns the D-state with the highest power
240 * (lowest D-state number) supported in the S-state "x".
242 * If the devices does not have a _PRW
243 * (Power Resources for Wake) supporting system wakeup from "x"
244 * then the OS is free to choose a lower power (higher number
245 * D-state) than the return value from _SxD.
247 * But if _PRW is enabled at S-state "x", the OS
248 * must not choose a power lower than _SxD --
249 * unless the device has an _SxW method specifying
250 * the lowest power (highest D-state number) the device
251 * may enter while still able to wake the system.
253 * ie. depending on global OS policy:
255 * if (_PRW at S-state x)
256 * choose from highest power _SxD to lowest power _SxW
257 * else // no _PRW at S-state x
258 * choose highest power _SxD or any lower power
261 static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
265 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL);
267 return PCI_POWER_ERROR;
269 switch (acpi_state) {
279 return PCI_POWER_ERROR;
282 static bool acpi_pci_power_manageable(struct pci_dev *dev)
284 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
286 return handle ? acpi_bus_power_manageable(handle) : false;
289 static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
291 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
293 static const u8 state_conv[] = {
294 [PCI_D0] = ACPI_STATE_D0,
295 [PCI_D1] = ACPI_STATE_D1,
296 [PCI_D2] = ACPI_STATE_D2,
297 [PCI_D3hot] = ACPI_STATE_D3,
298 [PCI_D3cold] = ACPI_STATE_D3
302 /* If the ACPI device has _EJ0, ignore the device */
303 if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
312 error = acpi_bus_set_power(handle, state_conv[state]);
316 dev_printk(KERN_INFO, &dev->dev,
317 "power state changed by ACPI to D%d\n", state);
322 static bool acpi_pci_can_wakeup(struct pci_dev *dev)
324 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
326 return handle ? acpi_bus_can_wakeup(handle) : false;
329 static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
331 int error = acpi_pm_device_sleep_wake(&dev->dev, enable);
334 dev_printk(KERN_INFO, &dev->dev,
335 "wake-up capability %s by ACPI\n",
336 enable ? "enabled" : "disabled");
340 static struct pci_platform_pm_ops acpi_pci_platform_pm = {
341 .is_manageable = acpi_pci_power_manageable,
342 .set_state = acpi_pci_set_power_state,
343 .choose_state = acpi_pci_choose_state,
344 .can_wakeup = acpi_pci_can_wakeup,
345 .sleep_wake = acpi_pci_sleep_wake,
349 static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
351 struct pci_dev * pci_dev;
354 pci_dev = to_pci_dev(dev);
355 /* Please ref to ACPI spec for the syntax of _ADR */
356 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
357 *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
363 static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle)
366 unsigned int seg, bus;
369 * The string should be the same as root bridge's name
370 * Please look at 'pci_scan_bus_parented'
372 num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus);
375 *handle = acpi_get_pci_rootbridge_handle(seg, bus);
381 static struct acpi_bus_type acpi_pci_bus = {
382 .bus = &pci_bus_type,
383 .find_device = acpi_pci_find_device,
384 .find_bridge = acpi_pci_find_root_bridge,
387 static int __init acpi_pci_init(void)
391 if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) {
392 printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
396 if (acpi_gbl_FADT.boot_flags & BAF_PCIE_ASPM_CONTROL) {
397 printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
401 ret = register_acpi_bus_type(&acpi_pci_bus);
404 pci_set_platform_pm(&acpi_pci_platform_pm);
407 arch_initcall(acpi_pci_init);