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, 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 osc_dw0, 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))
84 out_obj = output.pointer;
85 if (out_obj->type != ACPI_TYPE_BUFFER) {
86 printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n");
90 osc_dw0 = *((u32 *) out_obj->buffer.pointer);
92 if (osc_dw0 & OSC_REQUEST_ERROR)
93 printk(KERN_DEBUG "_OSC request fails\n");
94 if (osc_dw0 & OSC_INVALID_UUID_ERROR)
95 printk(KERN_DEBUG "_OSC invalid UUID\n");
96 if (osc_dw0 & OSC_INVALID_REVISION_ERROR)
97 printk(KERN_DEBUG "_OSC invalid revision\n");
98 if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) {
99 if (flags & OSC_QUERY_ENABLE)
101 printk(KERN_DEBUG "_OSC FW not grant req. control\n");
109 if (flags & OSC_QUERY_ENABLE)
110 osc_args->query_result =
111 *((u32 *)(out_obj->buffer.pointer + 8));
115 kfree(output.pointer);
119 static acpi_status acpi_query_osc(acpi_handle handle,
120 u32 level, void *context, void **retval)
123 struct acpi_osc_data *osc_data;
124 u32 flags = (unsigned long)context, support_set;
126 struct acpi_osc_args osc_args;
128 status = acpi_get_handle(handle, "_OSC", &tmp);
129 if (ACPI_FAILURE(status))
132 osc_data = acpi_get_osc_data(handle);
134 printk(KERN_ERR "acpi osc data array is full\n");
138 /* do _OSC query for all possible controls */
139 support_set = osc_data->support_set | (flags & OSC_SUPPORT_MASKS);
140 osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
141 osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set;
142 osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
144 status = acpi_run_osc(handle, &osc_args);
145 if (ACPI_SUCCESS(status)) {
146 osc_data->support_set = support_set;
147 osc_data->query_result = osc_args.query_result;
148 osc_data->is_queried = 1;
155 * __pci_osc_support_set - register OS support to Firmware
156 * @flags: OS support bits
159 * Update OS support fields and doing a _OSC Query to obtain an update
160 * from Firmware on supported control bits.
162 acpi_status __pci_osc_support_set(u32 flags, const char *hid)
164 if (!(flags & OSC_SUPPORT_MASKS))
167 acpi_get_devices(hid, acpi_query_osc,
168 (void *)(unsigned long)flags, NULL);
173 * pci_osc_control_set - commit requested control to Firmware
174 * @handle: acpi_handle for the target ACPI object
175 * @flags: driver's requested control bits
177 * Attempt to take control from Firmware on requested control bits.
179 acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
182 u32 ctrlset, control_set;
184 struct acpi_osc_data *osc_data;
185 struct acpi_osc_args osc_args;
187 status = acpi_get_handle(handle, "_OSC", &tmp);
188 if (ACPI_FAILURE(status))
191 osc_data = acpi_get_osc_data(handle);
193 printk(KERN_ERR "acpi osc data array is full\n");
197 ctrlset = (flags & OSC_CONTROL_MASKS);
201 if (osc_data->is_queried &&
202 ((osc_data->query_result & ctrlset) != ctrlset))
205 control_set = osc_data->control_set | ctrlset;
206 osc_args.capbuf[OSC_QUERY_TYPE] = 0;
207 osc_args.capbuf[OSC_SUPPORT_TYPE] = osc_data->support_set;
208 osc_args.capbuf[OSC_CONTROL_TYPE] = control_set;
209 status = acpi_run_osc(handle, &osc_args);
210 if (ACPI_SUCCESS(status))
211 osc_data->control_set = control_set;
215 EXPORT_SYMBOL(pci_osc_control_set);
217 #ifdef CONFIG_ACPI_SLEEP
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,
246 acpi_state = acpi_pm_device_sleep_state(&pdev->dev,
247 device_may_wakeup(&pdev->dev), NULL);
249 return PCI_POWER_ERROR;
251 switch (acpi_state) {
261 return PCI_POWER_ERROR;
265 static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
267 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
269 static const u8 state_conv[] = {
270 [PCI_D0] = ACPI_STATE_D0,
271 [PCI_D1] = ACPI_STATE_D1,
272 [PCI_D2] = ACPI_STATE_D2,
273 [PCI_D3hot] = ACPI_STATE_D3,
274 [PCI_D3cold] = ACPI_STATE_D3
279 /* If the ACPI device has _EJ0, ignore the device */
280 if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
289 return acpi_bus_set_power(handle, state_conv[state]);
296 static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
298 struct pci_dev * pci_dev;
301 pci_dev = to_pci_dev(dev);
302 /* Please ref to ACPI spec for the syntax of _ADR */
303 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
304 *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
310 static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle)
313 unsigned int seg, bus;
316 * The string should be the same as root bridge's name
317 * Please look at 'pci_scan_bus_parented'
319 num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus);
322 *handle = acpi_get_pci_rootbridge_handle(seg, bus);
328 static struct acpi_bus_type acpi_pci_bus = {
329 .bus = &pci_bus_type,
330 .find_device = acpi_pci_find_device,
331 .find_bridge = acpi_pci_find_root_bridge,
334 static int __init acpi_pci_init(void)
338 if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) {
339 printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
342 ret = register_acpi_bus_type(&acpi_pci_bus);
345 #ifdef CONFIG_ACPI_SLEEP
346 platform_pci_choose_state = acpi_pci_choose_state;
348 platform_pci_set_power_state = acpi_pci_set_power_state;
351 arch_initcall(acpi_pci_init);