ACPI/PCI: call _OSC support during root bridge discovery
[linux-2.6/mini2440.git] / drivers / pci / pci-acpi.c
blob8a1f02c3c915f520c1e7fb2469f817dceb336cb4
1 /*
2 * File: pci-acpi.c
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.
8 */
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>
21 #include "pci.h"
23 struct acpi_osc_data {
24 acpi_handle handle;
25 u32 support_set;
26 u32 control_set;
27 struct list_head sibiling;
29 static LIST_HEAD(acpi_osc_data_list);
31 struct acpi_osc_args {
32 u32 capbuf[3];
33 u32 ctrl_result;
36 static DEFINE_MUTEX(pci_acpi_lock);
38 static struct acpi_osc_data *acpi_get_osc_data(acpi_handle handle)
40 struct acpi_osc_data *data;
42 list_for_each_entry(data, &acpi_osc_data_list, sibiling) {
43 if (data->handle == handle)
44 return data;
46 data = kzalloc(sizeof(*data), GFP_KERNEL);
47 if (!data)
48 return NULL;
49 INIT_LIST_HEAD(&data->sibiling);
50 data->handle = handle;
51 list_add_tail(&data->sibiling, &acpi_osc_data_list);
52 return data;
55 static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40,
56 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
58 static acpi_status acpi_run_osc(acpi_handle handle,
59 struct acpi_osc_args *osc_args)
61 acpi_status status;
62 struct acpi_object_list input;
63 union acpi_object in_params[4];
64 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
65 union acpi_object *out_obj;
66 u32 errors, flags = osc_args->capbuf[OSC_QUERY_TYPE];
68 /* Setting up input parameters */
69 input.count = 4;
70 input.pointer = in_params;
71 in_params[0].type = ACPI_TYPE_BUFFER;
72 in_params[0].buffer.length = 16;
73 in_params[0].buffer.pointer = OSC_UUID;
74 in_params[1].type = ACPI_TYPE_INTEGER;
75 in_params[1].integer.value = 1;
76 in_params[2].type = ACPI_TYPE_INTEGER;
77 in_params[2].integer.value = 3;
78 in_params[3].type = ACPI_TYPE_BUFFER;
79 in_params[3].buffer.length = 12;
80 in_params[3].buffer.pointer = (u8 *)osc_args->capbuf;
82 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
83 if (ACPI_FAILURE(status))
84 return status;
86 if (!output.length)
87 return AE_NULL_OBJECT;
89 out_obj = output.pointer;
90 if (out_obj->type != ACPI_TYPE_BUFFER) {
91 printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n");
92 status = AE_TYPE;
93 goto out_kfree;
95 /* Need to ignore the bit0 in result code */
96 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
97 if (errors) {
98 if (errors & OSC_REQUEST_ERROR)
99 printk(KERN_DEBUG "_OSC request fails\n");
100 if (errors & OSC_INVALID_UUID_ERROR)
101 printk(KERN_DEBUG "_OSC invalid UUID\n");
102 if (errors & OSC_INVALID_REVISION_ERROR)
103 printk(KERN_DEBUG "_OSC invalid revision\n");
104 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
105 if (flags & OSC_QUERY_ENABLE)
106 goto out_success;
107 printk(KERN_DEBUG "_OSC FW not grant req. control\n");
108 status = AE_SUPPORT;
109 goto out_kfree;
111 status = AE_ERROR;
112 goto out_kfree;
114 out_success:
115 osc_args->ctrl_result =
116 *((u32 *)(out_obj->buffer.pointer + 8));
117 status = AE_OK;
119 out_kfree:
120 kfree(output.pointer);
121 return status;
124 static acpi_status __acpi_query_osc(u32 flags, struct acpi_osc_data *osc_data,
125 u32 *result)
127 acpi_status status;
128 u32 support_set;
129 struct acpi_osc_args osc_args;
131 /* do _OSC query for all possible controls */
132 support_set = osc_data->support_set | (flags & OSC_SUPPORT_MASKS);
133 osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
134 osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set;
135 osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
137 status = acpi_run_osc(osc_data->handle, &osc_args);
138 if (ACPI_SUCCESS(status)) {
139 osc_data->support_set = support_set;
140 *result = osc_args.ctrl_result;
143 return status;
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)
154 u32 dummy;
155 acpi_status status;
156 acpi_handle tmp;
157 struct acpi_osc_data *osc_data;
158 int rc = 0;
160 status = acpi_get_handle(handle, "_OSC", &tmp);
161 if (ACPI_FAILURE(status))
162 return -ENOTTY;
164 mutex_lock(&pci_acpi_lock);
165 osc_data = acpi_get_osc_data(handle);
166 if (!osc_data) {
167 printk(KERN_ERR "acpi osc data array is full\n");
168 rc = -ENOMEM;
169 goto out;
172 __acpi_query_osc(flags, osc_data, &dummy);
173 out:
174 mutex_unlock(&pci_acpi_lock);
175 return rc;
178 static acpi_status acpi_query_osc(acpi_handle handle, u32 level,
179 void *context, void **retval)
181 pci_acpi_osc_support(handle, (unsigned long)context);
182 return AE_OK;
186 * __pci_osc_support_set - register OS support to Firmware
187 * @flags: OS support bits
188 * @hid: hardware ID
190 * Update OS support fields and doing a _OSC Query to obtain an update
191 * from Firmware on supported control bits.
193 acpi_status __pci_osc_support_set(u32 flags, const char *hid)
195 if (!(flags & OSC_SUPPORT_MASKS))
196 return AE_TYPE;
198 acpi_get_devices(hid, acpi_query_osc,
199 (void *)(unsigned long)flags, NULL);
200 return AE_OK;
204 * pci_osc_control_set - commit requested control to Firmware
205 * @handle: acpi_handle for the target ACPI object
206 * @flags: driver's requested control bits
208 * Attempt to take control from Firmware on requested control bits.
210 acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
212 acpi_status status;
213 u32 ctrlset, control_set, result;
214 acpi_handle tmp;
215 struct acpi_osc_data *osc_data;
216 struct acpi_osc_args osc_args;
218 status = acpi_get_handle(handle, "_OSC", &tmp);
219 if (ACPI_FAILURE(status))
220 return status;
222 mutex_lock(&pci_acpi_lock);
223 osc_data = acpi_get_osc_data(handle);
224 if (!osc_data) {
225 printk(KERN_ERR "acpi osc data array is full\n");
226 status = AE_ERROR;
227 goto out;
230 ctrlset = (flags & OSC_CONTROL_MASKS);
231 if (!ctrlset) {
232 status = AE_TYPE;
233 goto out;
236 status = __acpi_query_osc(osc_data->support_set, osc_data, &result);
237 if (ACPI_FAILURE(status))
238 goto out;
240 if ((result & ctrlset) != ctrlset) {
241 status = AE_SUPPORT;
242 goto out;
245 control_set = osc_data->control_set | ctrlset;
246 osc_args.capbuf[OSC_QUERY_TYPE] = 0;
247 osc_args.capbuf[OSC_SUPPORT_TYPE] = osc_data->support_set;
248 osc_args.capbuf[OSC_CONTROL_TYPE] = control_set;
249 status = acpi_run_osc(handle, &osc_args);
250 if (ACPI_SUCCESS(status))
251 osc_data->control_set = control_set;
252 out:
253 mutex_unlock(&pci_acpi_lock);
254 return status;
256 EXPORT_SYMBOL(pci_osc_control_set);
259 * _SxD returns the D-state with the highest power
260 * (lowest D-state number) supported in the S-state "x".
262 * If the devices does not have a _PRW
263 * (Power Resources for Wake) supporting system wakeup from "x"
264 * then the OS is free to choose a lower power (higher number
265 * D-state) than the return value from _SxD.
267 * But if _PRW is enabled at S-state "x", the OS
268 * must not choose a power lower than _SxD --
269 * unless the device has an _SxW method specifying
270 * the lowest power (highest D-state number) the device
271 * may enter while still able to wake the system.
273 * ie. depending on global OS policy:
275 * if (_PRW at S-state x)
276 * choose from highest power _SxD to lowest power _SxW
277 * else // no _PRW at S-state x
278 * choose highest power _SxD or any lower power
281 static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
283 int acpi_state;
285 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL);
286 if (acpi_state < 0)
287 return PCI_POWER_ERROR;
289 switch (acpi_state) {
290 case ACPI_STATE_D0:
291 return PCI_D0;
292 case ACPI_STATE_D1:
293 return PCI_D1;
294 case ACPI_STATE_D2:
295 return PCI_D2;
296 case ACPI_STATE_D3:
297 return PCI_D3hot;
299 return PCI_POWER_ERROR;
302 static bool acpi_pci_power_manageable(struct pci_dev *dev)
304 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
306 return handle ? acpi_bus_power_manageable(handle) : false;
309 static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
311 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
312 acpi_handle tmp;
313 static const u8 state_conv[] = {
314 [PCI_D0] = ACPI_STATE_D0,
315 [PCI_D1] = ACPI_STATE_D1,
316 [PCI_D2] = ACPI_STATE_D2,
317 [PCI_D3hot] = ACPI_STATE_D3,
318 [PCI_D3cold] = ACPI_STATE_D3
320 int error = -EINVAL;
322 /* If the ACPI device has _EJ0, ignore the device */
323 if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
324 return -ENODEV;
326 switch (state) {
327 case PCI_D0:
328 case PCI_D1:
329 case PCI_D2:
330 case PCI_D3hot:
331 case PCI_D3cold:
332 error = acpi_bus_set_power(handle, state_conv[state]);
335 if (!error)
336 dev_printk(KERN_INFO, &dev->dev,
337 "power state changed by ACPI to D%d\n", state);
339 return error;
342 static bool acpi_pci_can_wakeup(struct pci_dev *dev)
344 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
346 return handle ? acpi_bus_can_wakeup(handle) : false;
349 static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
351 int error = acpi_pm_device_sleep_wake(&dev->dev, enable);
353 if (!error)
354 dev_printk(KERN_INFO, &dev->dev,
355 "wake-up capability %s by ACPI\n",
356 enable ? "enabled" : "disabled");
357 return error;
360 static struct pci_platform_pm_ops acpi_pci_platform_pm = {
361 .is_manageable = acpi_pci_power_manageable,
362 .set_state = acpi_pci_set_power_state,
363 .choose_state = acpi_pci_choose_state,
364 .can_wakeup = acpi_pci_can_wakeup,
365 .sleep_wake = acpi_pci_sleep_wake,
368 /* ACPI bus type */
369 static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
371 struct pci_dev * pci_dev;
372 acpi_integer addr;
374 pci_dev = to_pci_dev(dev);
375 /* Please ref to ACPI spec for the syntax of _ADR */
376 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
377 *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
378 if (!*handle)
379 return -ENODEV;
380 return 0;
383 static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle)
385 int num;
386 unsigned int seg, bus;
389 * The string should be the same as root bridge's name
390 * Please look at 'pci_scan_bus_parented'
392 num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus);
393 if (num != 2)
394 return -ENODEV;
395 *handle = acpi_get_pci_rootbridge_handle(seg, bus);
396 if (!*handle)
397 return -ENODEV;
398 return 0;
401 static struct acpi_bus_type acpi_pci_bus = {
402 .bus = &pci_bus_type,
403 .find_device = acpi_pci_find_device,
404 .find_bridge = acpi_pci_find_root_bridge,
407 static int __init acpi_pci_init(void)
409 int ret;
411 if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) {
412 printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
413 pci_no_msi();
416 if (acpi_gbl_FADT.boot_flags & BAF_PCIE_ASPM_CONTROL) {
417 printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
418 pcie_no_aspm();
421 ret = register_acpi_bus_type(&acpi_pci_bus);
422 if (ret)
423 return 0;
424 pci_set_platform_pm(&acpi_pci_platform_pm);
425 return 0;
427 arch_initcall(acpi_pci_init);