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 static u32 ctrlset_buf[3] = {0, 0, 0};
23 static u32 global_ctrlsets = 0;
24 static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40, 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
34 struct acpi_object_list input;
35 union acpi_object in_params[4];
36 struct acpi_buffer output;
37 union acpi_object out_obj;
40 /* Setting up output buffer */
41 output.length = sizeof(out_obj) + 3*sizeof(u32);
42 output.pointer = &out_obj;
44 /* Setting up input parameters */
46 input.pointer = in_params;
47 in_params[0].type = ACPI_TYPE_BUFFER;
48 in_params[0].buffer.length = 16;
49 in_params[0].buffer.pointer = OSC_UUID;
50 in_params[1].type = ACPI_TYPE_INTEGER;
51 in_params[1].integer.value = 1;
52 in_params[2].type = ACPI_TYPE_INTEGER;
53 in_params[2].integer.value = 3;
54 in_params[3].type = ACPI_TYPE_BUFFER;
55 in_params[3].buffer.length = 12;
56 in_params[3].buffer.pointer = (u8 *)context;
58 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
59 if (ACPI_FAILURE (status)) {
61 "Evaluate _OSC Set fails. Status = 0x%04x\n", status);
64 if (out_obj.type != ACPI_TYPE_BUFFER) {
66 "Evaluate _OSC returns wrong type\n");
69 osc_dw0 = *((u32 *) out_obj.buffer.pointer);
71 if (osc_dw0 & OSC_REQUEST_ERROR)
72 printk(KERN_DEBUG "_OSC request fails\n");
73 if (osc_dw0 & OSC_INVALID_UUID_ERROR)
74 printk(KERN_DEBUG "_OSC invalid UUID\n");
75 if (osc_dw0 & OSC_INVALID_REVISION_ERROR)
76 printk(KERN_DEBUG "_OSC invalid revision\n");
77 if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) {
78 /* Update Global Control Set */
79 global_ctrlsets = *((u32 *)(out_obj.buffer.pointer+8));
85 /* Update Global Control Set */
86 global_ctrlsets = *((u32 *)(out_obj.buffer.pointer + 8));
99 struct acpi_object_list input;
100 union acpi_object in_params[4];
101 struct acpi_buffer output;
102 union acpi_object out_obj;
105 /* Setting up output buffer */
106 output.length = sizeof(out_obj) + 3*sizeof(u32);
107 output.pointer = &out_obj;
109 /* Setting up input parameters */
111 input.pointer = in_params;
112 in_params[0].type = ACPI_TYPE_BUFFER;
113 in_params[0].buffer.length = 16;
114 in_params[0].buffer.pointer = OSC_UUID;
115 in_params[1].type = ACPI_TYPE_INTEGER;
116 in_params[1].integer.value = 1;
117 in_params[2].type = ACPI_TYPE_INTEGER;
118 in_params[2].integer.value = 3;
119 in_params[3].type = ACPI_TYPE_BUFFER;
120 in_params[3].buffer.length = 12;
121 in_params[3].buffer.pointer = (u8 *)context;
123 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
124 if (ACPI_FAILURE (status)) {
126 "Evaluate _OSC Set fails. Status = 0x%04x\n", status);
129 if (out_obj.type != ACPI_TYPE_BUFFER) {
131 "Evaluate _OSC returns wrong type\n");
134 osc_dw0 = *((u32 *) out_obj.buffer.pointer);
136 if (osc_dw0 & OSC_REQUEST_ERROR)
137 printk(KERN_DEBUG "_OSC request fails\n");
138 if (osc_dw0 & OSC_INVALID_UUID_ERROR)
139 printk(KERN_DEBUG "_OSC invalid UUID\n");
140 if (osc_dw0 & OSC_INVALID_REVISION_ERROR)
141 printk(KERN_DEBUG "_OSC invalid revision\n");
142 if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) {
143 printk(KERN_DEBUG "_OSC FW not grant req. control\n");
152 * pci_osc_support_set - register OS support to Firmware
153 * @flags: OS support bits
155 * Update OS support fields and doing a _OSC Query to obtain an update
156 * from Firmware on supported control bits.
158 acpi_status pci_osc_support_set(u32 flags)
162 if (!(flags & OSC_SUPPORT_MASKS)) {
165 ctrlset_buf[OSC_SUPPORT_TYPE] |= (flags & OSC_SUPPORT_MASKS);
167 /* do _OSC query for all possible controls */
168 temp = ctrlset_buf[OSC_CONTROL_TYPE];
169 ctrlset_buf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
170 ctrlset_buf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
171 acpi_get_devices ( PCI_ROOT_HID_STRING,
175 ctrlset_buf[OSC_QUERY_TYPE] = !OSC_QUERY_ENABLE;
176 ctrlset_buf[OSC_CONTROL_TYPE] = temp;
179 EXPORT_SYMBOL(pci_osc_support_set);
182 * pci_osc_control_set - commit requested control to Firmware
183 * @flags: driver's requested control bits
185 * Attempt to take control from Firmware on requested control bits.
187 acpi_status pci_osc_control_set(u32 flags)
192 ctrlset = (flags & OSC_CONTROL_MASKS);
196 if (ctrlset_buf[OSC_SUPPORT_TYPE] &&
197 ((global_ctrlsets & ctrlset) != ctrlset)) {
200 ctrlset_buf[OSC_CONTROL_TYPE] |= ctrlset;
201 status = acpi_get_devices ( PCI_ROOT_HID_STRING,
205 if (ACPI_FAILURE (status)) {
206 ctrlset_buf[OSC_CONTROL_TYPE] &= ~ctrlset;
211 EXPORT_SYMBOL(pci_osc_control_set);
214 * _SxD returns the D-state with the highest power
215 * (lowest D-state number) supported in the S-state "x".
217 * If the devices does not have a _PRW
218 * (Power Resources for Wake) supporting system wakeup from "x"
219 * then the OS is free to choose a lower power (higher number
220 * D-state) than the return value from _SxD.
222 * But if _PRW is enabled at S-state "x", the OS
223 * must not choose a power lower than _SxD --
224 * unless the device has an _SxW method specifying
225 * the lowest power (highest D-state number) the device
226 * may enter while still able to wake the system.
228 * ie. depending on global OS policy:
230 * if (_PRW at S-state x)
231 * choose from highest power _SxD to lowest power _SxW
232 * else // no _PRW at S-state x
233 * choose highest power _SxD or any lower power
235 * currently we simply return _SxD, if present.
238 static int acpi_pci_choose_state(struct pci_dev *pdev, pm_message_t state)
245 static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
247 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
248 static int state_conv[] = {
255 int acpi_state = state_conv[(int __force) state];
259 return acpi_bus_set_power(handle, acpi_state);
264 static int pci_acpi_find_device(struct device *dev, acpi_handle *handle)
266 struct pci_dev * pci_dev;
269 pci_dev = to_pci_dev(dev);
270 /* Please ref to ACPI spec for the syntax of _ADR */
271 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
272 *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
278 static int pci_acpi_find_root_bridge(struct device *dev, acpi_handle *handle)
281 unsigned int seg, bus;
284 * The string should be the same as root bridge's name
285 * Please look at 'pci_scan_bus_parented'
287 num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus);
290 *handle = acpi_get_pci_rootbridge_handle(seg, bus);
296 static struct acpi_bus_type pci_acpi_bus = {
297 .bus = &pci_bus_type,
298 .find_device = pci_acpi_find_device,
299 .find_bridge = pci_acpi_find_root_bridge,
302 static int __init pci_acpi_init(void)
306 ret = register_acpi_bus_type(&pci_acpi_bus);
309 platform_pci_choose_state = acpi_pci_choose_state;
310 platform_pci_set_power_state = acpi_pci_set_power_state;
313 arch_initcall(pci_acpi_init);