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 = {ACPI_ALLOCATE_BUFFER, NULL};
37 union acpi_object *out_obj;
39 acpi_status *ret_status = (acpi_status *)retval;
42 /* Setting up input parameters */
44 input.pointer = in_params;
45 in_params[0].type = ACPI_TYPE_BUFFER;
46 in_params[0].buffer.length = 16;
47 in_params[0].buffer.pointer = OSC_UUID;
48 in_params[1].type = ACPI_TYPE_INTEGER;
49 in_params[1].integer.value = 1;
50 in_params[2].type = ACPI_TYPE_INTEGER;
51 in_params[2].integer.value = 3;
52 in_params[3].type = ACPI_TYPE_BUFFER;
53 in_params[3].buffer.length = 12;
54 in_params[3].buffer.pointer = (u8 *)context;
56 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
57 if (ACPI_FAILURE (status)) {
61 out_obj = output.pointer;
63 if (out_obj->type != ACPI_TYPE_BUFFER) {
65 "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));
87 /* Update Global Control Set */
88 global_ctrlsets = *((u32 *)(out_obj->buffer.pointer + 8));
92 kfree(output.pointer);
104 struct acpi_object_list input;
105 union acpi_object in_params[4];
106 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
107 union acpi_object *out_obj;
110 /* Setting up input parameters */
112 input.pointer = in_params;
113 in_params[0].type = ACPI_TYPE_BUFFER;
114 in_params[0].buffer.length = 16;
115 in_params[0].buffer.pointer = OSC_UUID;
116 in_params[1].type = ACPI_TYPE_INTEGER;
117 in_params[1].integer.value = 1;
118 in_params[2].type = ACPI_TYPE_INTEGER;
119 in_params[2].integer.value = 3;
120 in_params[3].type = ACPI_TYPE_BUFFER;
121 in_params[3].buffer.length = 12;
122 in_params[3].buffer.pointer = (u8 *)context;
124 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
125 if (ACPI_FAILURE (status))
128 out_obj = output.pointer;
129 if (out_obj->type != ACPI_TYPE_BUFFER) {
131 "Evaluate _OSC returns wrong type\n");
135 osc_dw0 = *((u32 *) out_obj->buffer.pointer);
137 if (osc_dw0 & OSC_REQUEST_ERROR)
138 printk(KERN_DEBUG "_OSC request fails\n");
139 if (osc_dw0 & OSC_INVALID_UUID_ERROR)
140 printk(KERN_DEBUG "_OSC invalid UUID\n");
141 if (osc_dw0 & OSC_INVALID_REVISION_ERROR)
142 printk(KERN_DEBUG "_OSC invalid revision\n");
143 if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) {
144 printk(KERN_DEBUG "_OSC FW not grant req. control\n");
154 kfree(output.pointer);
159 * __pci_osc_support_set - register OS support to Firmware
160 * @flags: OS support bits
162 * Update OS support fields and doing a _OSC Query to obtain an update
163 * from Firmware on supported control bits.
165 acpi_status __pci_osc_support_set(u32 flags, const char *hid)
170 if (!(flags & OSC_SUPPORT_MASKS)) {
173 ctrlset_buf[OSC_SUPPORT_TYPE] |= (flags & OSC_SUPPORT_MASKS);
175 /* do _OSC query for all possible controls */
176 temp = ctrlset_buf[OSC_CONTROL_TYPE];
177 ctrlset_buf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
178 ctrlset_buf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
179 acpi_get_devices(hid,
183 ctrlset_buf[OSC_QUERY_TYPE] = !OSC_QUERY_ENABLE;
184 ctrlset_buf[OSC_CONTROL_TYPE] = temp;
185 if (ACPI_FAILURE(retval)) {
186 /* no osc support at all */
187 ctrlset_buf[OSC_SUPPORT_TYPE] = 0;
193 * pci_osc_control_set - commit requested control to Firmware
194 * @handle: acpi_handle for the target ACPI object
195 * @flags: driver's requested control bits
197 * Attempt to take control from Firmware on requested control bits.
199 acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
204 ctrlset = (flags & OSC_CONTROL_MASKS);
208 if (ctrlset_buf[OSC_SUPPORT_TYPE] &&
209 ((global_ctrlsets & ctrlset) != ctrlset)) {
212 ctrlset_buf[OSC_CONTROL_TYPE] |= ctrlset;
213 status = acpi_run_osc(handle, ctrlset_buf);
214 if (ACPI_FAILURE (status)) {
215 ctrlset_buf[OSC_CONTROL_TYPE] &= ~ctrlset;
220 EXPORT_SYMBOL(pci_osc_control_set);
222 #ifdef CONFIG_ACPI_SLEEP
224 * _SxD returns the D-state with the highest power
225 * (lowest D-state number) supported in the S-state "x".
227 * If the devices does not have a _PRW
228 * (Power Resources for Wake) supporting system wakeup from "x"
229 * then the OS is free to choose a lower power (higher number
230 * D-state) than the return value from _SxD.
232 * But if _PRW is enabled at S-state "x", the OS
233 * must not choose a power lower than _SxD --
234 * unless the device has an _SxW method specifying
235 * the lowest power (highest D-state number) the device
236 * may enter while still able to wake the system.
238 * ie. depending on global OS policy:
240 * if (_PRW at S-state x)
241 * choose from highest power _SxD to lowest power _SxW
242 * else // no _PRW at S-state x
243 * choose highest power _SxD or any lower power
245 * currently we simply return _SxD, if present.
248 static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev,
253 acpi_state = acpi_pm_device_sleep_state(&pdev->dev,
254 device_may_wakeup(&pdev->dev), NULL);
256 return PCI_POWER_ERROR;
258 switch (acpi_state) {
268 return PCI_POWER_ERROR;
272 static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
274 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
276 static int state_conv[] = {
283 int acpi_state = state_conv[(int __force) state];
287 /* If the ACPI device has _EJ0, ignore the device */
288 if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
290 return acpi_bus_set_power(handle, acpi_state);
295 static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
297 struct pci_dev * pci_dev;
300 pci_dev = to_pci_dev(dev);
301 /* Please ref to ACPI spec for the syntax of _ADR */
302 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
303 *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
309 static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle)
312 unsigned int seg, bus;
315 * The string should be the same as root bridge's name
316 * Please look at 'pci_scan_bus_parented'
318 num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus);
321 *handle = acpi_get_pci_rootbridge_handle(seg, bus);
327 static struct acpi_bus_type acpi_pci_bus = {
328 .bus = &pci_bus_type,
329 .find_device = acpi_pci_find_device,
330 .find_bridge = acpi_pci_find_root_bridge,
333 static int __init acpi_pci_init(void)
337 if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) {
338 printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
341 ret = register_acpi_bus_type(&acpi_pci_bus);
344 #ifdef CONFIG_ACPI_SLEEP
345 platform_pci_choose_state = acpi_pci_choose_state;
347 platform_pci_set_power_state = acpi_pci_set_power_state;
350 arch_initcall(acpi_pci_init);