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));
97 struct acpi_object_list input;
98 union acpi_object in_params[4];
99 struct acpi_buffer output;
100 union acpi_object out_obj;
103 /* Setting up output buffer */
104 output.length = sizeof(out_obj) + 3*sizeof(u32);
105 output.pointer = &out_obj;
107 /* Setting up input parameters */
109 input.pointer = in_params;
110 in_params[0].type = ACPI_TYPE_BUFFER;
111 in_params[0].buffer.length = 16;
112 in_params[0].buffer.pointer = OSC_UUID;
113 in_params[1].type = ACPI_TYPE_INTEGER;
114 in_params[1].integer.value = 1;
115 in_params[2].type = ACPI_TYPE_INTEGER;
116 in_params[2].integer.value = 3;
117 in_params[3].type = ACPI_TYPE_BUFFER;
118 in_params[3].buffer.length = 12;
119 in_params[3].buffer.pointer = (u8 *)context;
121 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
122 if (ACPI_FAILURE (status)) {
124 "Evaluate _OSC Set fails. Status = 0x%04x\n", status);
127 if (out_obj.type != ACPI_TYPE_BUFFER) {
129 "Evaluate _OSC returns wrong type\n");
132 osc_dw0 = *((u32 *) out_obj.buffer.pointer);
134 if (osc_dw0 & OSC_REQUEST_ERROR)
135 printk(KERN_DEBUG "_OSC request fails\n");
136 if (osc_dw0 & OSC_INVALID_UUID_ERROR)
137 printk(KERN_DEBUG "_OSC invalid UUID\n");
138 if (osc_dw0 & OSC_INVALID_REVISION_ERROR)
139 printk(KERN_DEBUG "_OSC invalid revision\n");
140 if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) {
141 printk(KERN_DEBUG "_OSC FW not grant req. control\n");
150 * pci_osc_support_set - register OS support to Firmware
151 * @flags: OS support bits
153 * Update OS support fields and doing a _OSC Query to obtain an update
154 * from Firmware on supported control bits.
156 acpi_status pci_osc_support_set(u32 flags)
160 if (!(flags & OSC_SUPPORT_MASKS)) {
163 ctrlset_buf[OSC_SUPPORT_TYPE] |= (flags & OSC_SUPPORT_MASKS);
165 /* do _OSC query for all possible controls */
166 temp = ctrlset_buf[OSC_CONTROL_TYPE];
167 ctrlset_buf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
168 ctrlset_buf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
169 acpi_get_devices ( PCI_ROOT_HID_STRING,
173 ctrlset_buf[OSC_QUERY_TYPE] = !OSC_QUERY_ENABLE;
174 ctrlset_buf[OSC_CONTROL_TYPE] = temp;
177 EXPORT_SYMBOL(pci_osc_support_set);
180 * pci_osc_control_set - commit requested control to Firmware
181 * @flags: driver's requested control bits
183 * Attempt to take control from Firmware on requested control bits.
185 acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
190 ctrlset = (flags & OSC_CONTROL_MASKS);
194 if (ctrlset_buf[OSC_SUPPORT_TYPE] &&
195 ((global_ctrlsets & ctrlset) != ctrlset)) {
198 ctrlset_buf[OSC_CONTROL_TYPE] |= ctrlset;
199 status = acpi_run_osc(handle, ctrlset_buf);
200 if (ACPI_FAILURE (status)) {
201 ctrlset_buf[OSC_CONTROL_TYPE] &= ~ctrlset;
206 EXPORT_SYMBOL(pci_osc_control_set);
209 * _SxD returns the D-state with the highest power
210 * (lowest D-state number) supported in the S-state "x".
212 * If the devices does not have a _PRW
213 * (Power Resources for Wake) supporting system wakeup from "x"
214 * then the OS is free to choose a lower power (higher number
215 * D-state) than the return value from _SxD.
217 * But if _PRW is enabled at S-state "x", the OS
218 * must not choose a power lower than _SxD --
219 * unless the device has an _SxW method specifying
220 * the lowest power (highest D-state number) the device
221 * may enter while still able to wake the system.
223 * ie. depending on global OS policy:
225 * if (_PRW at S-state x)
226 * choose from highest power _SxD to lowest power _SxW
227 * else // no _PRW at S-state x
228 * choose highest power _SxD or any lower power
230 * currently we simply return _SxD, if present.
233 static int acpi_pci_choose_state(struct pci_dev *pdev, pm_message_t state)
240 static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
242 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
243 static int state_conv[] = {
250 int acpi_state = state_conv[(int __force) state];
254 return acpi_bus_set_power(handle, acpi_state);
259 static int pci_acpi_find_device(struct device *dev, acpi_handle *handle)
261 struct pci_dev * pci_dev;
264 pci_dev = to_pci_dev(dev);
265 /* Please ref to ACPI spec for the syntax of _ADR */
266 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
267 *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
273 static int pci_acpi_find_root_bridge(struct device *dev, acpi_handle *handle)
276 unsigned int seg, bus;
279 * The string should be the same as root bridge's name
280 * Please look at 'pci_scan_bus_parented'
282 num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus);
285 *handle = acpi_get_pci_rootbridge_handle(seg, bus);
291 static struct acpi_bus_type pci_acpi_bus = {
292 .bus = &pci_bus_type,
293 .find_device = pci_acpi_find_device,
294 .find_bridge = pci_acpi_find_root_bridge,
297 static int __init pci_acpi_init(void)
301 ret = register_acpi_bus_type(&pci_acpi_bus);
304 platform_pci_choose_state = acpi_pci_choose_state;
305 platform_pci_set_power_state = acpi_pci_set_power_state;
308 arch_initcall(pci_acpi_init);