/* * File: pci-acpi.c * Purpose: Provide PCI support in ACPI * * Copyright (C) 2005 David Shaohua Li <shaohua.li@intel.com> * Copyright (C) 2004 Tom Long Nguyen <tom.l.nguyen@intel.com> * Copyright (C) 2004 Intel Corp. */ #include <linux/delay.h> #include <linux/init.h> #include <linux/pci.h> #include <linux/module.h> #include <acpi/acpi.h> #include <acpi/acnamesp.h> #include <acpi/acresrc.h> #include <acpi/acpi_bus.h> #include <linux/pci-acpi.h> #include "pci.h" static u32 ctrlset_buf[3] = {0, 0, 0}; static u32 global_ctrlsets = 0; static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40, 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66}; static acpi_status acpi_query_osc ( acpi_handle handle, u32 level, void *context, void **retval ) { acpi_status status; struct acpi_object_list input; union acpi_object in_params[4]; struct acpi_buffer output; union acpi_object out_obj; u32 osc_dw0; /* Setting up output buffer */ output.length = sizeof(out_obj) + 3*sizeof(u32); output.pointer = &out_obj; /* Setting up input parameters */ input.count = 4; input.pointer = in_params; in_params[0].type = ACPI_TYPE_BUFFER; in_params[0].buffer.length = 16; in_params[0].buffer.pointer = OSC_UUID; in_params[1].type = ACPI_TYPE_INTEGER; in_params[1].integer.value = 1; in_params[2].type = ACPI_TYPE_INTEGER; in_params[2].integer.value = 3; in_params[3].type = ACPI_TYPE_BUFFER; in_params[3].buffer.length = 12; in_params[3].buffer.pointer = (u8 *)context; status = acpi_evaluate_object(handle, "_OSC", &input, &output); if (ACPI_FAILURE (status)) { printk(KERN_DEBUG "Evaluate _OSC Set fails. Status = 0x%04x\n", status); return status; } if (out_obj.type != ACPI_TYPE_BUFFER) { printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n"); return AE_TYPE; } osc_dw0 = *((u32 *) out_obj.buffer.pointer); if (osc_dw0) { if (osc_dw0 & OSC_REQUEST_ERROR) printk(KERN_DEBUG "_OSC request fails\n"); if (osc_dw0 & OSC_INVALID_UUID_ERROR) printk(KERN_DEBUG "_OSC invalid UUID\n"); if (osc_dw0 & OSC_INVALID_REVISION_ERROR) printk(KERN_DEBUG "_OSC invalid revision\n"); if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) { /* Update Global Control Set */ global_ctrlsets = *((u32 *)(out_obj.buffer.pointer+8)); return AE_OK; } return AE_ERROR; } /* Update Global Control Set */ global_ctrlsets = *((u32 *)(out_obj.buffer.pointer + 8)); return AE_OK; } static acpi_status acpi_run_osc ( acpi_handle handle, void *context) { acpi_status status; struct acpi_object_list input; union acpi_object in_params[4]; struct acpi_buffer output; union acpi_object out_obj; u32 osc_dw0; /* Setting up output buffer */ output.length = sizeof(out_obj) + 3*sizeof(u32); output.pointer = &out_obj; /* Setting up input parameters */ input.count = 4; input.pointer = in_params; in_params[0].type = ACPI_TYPE_BUFFER; in_params[0].buffer.length = 16; in_params[0].buffer.pointer = OSC_UUID; in_params[1].type = ACPI_TYPE_INTEGER; in_params[1].integer.value = 1; in_params[2].type = ACPI_TYPE_INTEGER; in_params[2].integer.value = 3; in_params[3].type = ACPI_TYPE_BUFFER; in_params[3].buffer.length = 12; in_params[3].buffer.pointer = (u8 *)context; status = acpi_evaluate_object(handle, "_OSC", &input, &output); if (ACPI_FAILURE (status)) { printk(KERN_DEBUG "Evaluate _OSC Set fails. Status = 0x%04x\n", status); return status; } if (out_obj.type != ACPI_TYPE_BUFFER) { printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n"); return AE_TYPE; } osc_dw0 = *((u32 *) out_obj.buffer.pointer); if (osc_dw0) { if (osc_dw0 & OSC_REQUEST_ERROR) printk(KERN_DEBUG "_OSC request fails\n"); if (osc_dw0 & OSC_INVALID_UUID_ERROR) printk(KERN_DEBUG "_OSC invalid UUID\n"); if (osc_dw0 & OSC_INVALID_REVISION_ERROR) printk(KERN_DEBUG "_OSC invalid revision\n"); if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) { printk(KERN_DEBUG "_OSC FW not grant req. control\n"); return AE_SUPPORT; } return AE_ERROR; } return AE_OK; } /** * pci_osc_support_set - register OS support to Firmware * @flags: OS support bits * * Update OS support fields and doing a _OSC Query to obtain an update * from Firmware on supported control bits. **/ acpi_status pci_osc_support_set(u32 flags) { u32 temp; if (!(flags & OSC_SUPPORT_MASKS)) { return AE_TYPE; } ctrlset_buf[OSC_SUPPORT_TYPE] |= (flags & OSC_SUPPORT_MASKS); /* do _OSC query for all possible controls */ temp = ctrlset_buf[OSC_CONTROL_TYPE]; ctrlset_buf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; ctrlset_buf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS; acpi_get_devices ( PCI_ROOT_HID_STRING, acpi_query_osc, ctrlset_buf, NULL ); ctrlset_buf[OSC_QUERY_TYPE] = !OSC_QUERY_ENABLE; ctrlset_buf[OSC_CONTROL_TYPE] = temp; return AE_OK; } EXPORT_SYMBOL(pci_osc_support_set); /** * pci_osc_control_set - commit requested control to Firmware * @handle: acpi_handle for the target ACPI object * @flags: driver's requested control bits * * Attempt to take control from Firmware on requested control bits. **/ acpi_status pci_osc_control_set(acpi_handle handle, u32 flags) { acpi_status status; u32 ctrlset; ctrlset = (flags & OSC_CONTROL_MASKS); if (!ctrlset) { return AE_TYPE; } if (ctrlset_buf[OSC_SUPPORT_TYPE] && ((global_ctrlsets & ctrlset) != ctrlset)) { return AE_SUPPORT; } ctrlset_buf[OSC_CONTROL_TYPE] |= ctrlset; status = acpi_run_osc(handle, ctrlset_buf); if (ACPI_FAILURE (status)) { ctrlset_buf[OSC_CONTROL_TYPE] &= ~ctrlset; } return status; } EXPORT_SYMBOL(pci_osc_control_set); /* * _SxD returns the D-state with the highest power * (lowest D-state number) supported in the S-state "x". * * If the devices does not have a _PRW * (Power Resources for Wake) supporting system wakeup from "x" * then the OS is free to choose a lower power (higher number * D-state) than the return value from _SxD. * * But if _PRW is enabled at S-state "x", the OS * must not choose a power lower than _SxD -- * unless the device has an _SxW method specifying * the lowest power (highest D-state number) the device * may enter while still able to wake the system. * * ie. depending on global OS policy: * * if (_PRW at S-state x) * choose from highest power _SxD to lowest power _SxW * else // no _PRW at S-state x * choose highest power _SxD or any lower power * * currently we simply return _SxD, if present. */ static int acpi_pci_choose_state(struct pci_dev *pdev, pm_message_t state) { /* TBD */ return -ENODEV; } static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) { acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); static int state_conv[] = { [0] = 0, [1] = 1, [2] = 2, [3] = 3, [4] = 3 }; int acpi_state = state_conv[(int __force) state]; if (!handle) return -ENODEV; return acpi_bus_set_power(handle, acpi_state); } /* ACPI bus type */ static int pci_acpi_find_device(struct device *dev, acpi_handle *handle) { struct pci_dev * pci_dev; acpi_integer addr; pci_dev = to_pci_dev(dev); /* Please ref to ACPI spec for the syntax of _ADR */ addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn); *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr); if (!*handle) return -ENODEV; return 0; } static int pci_acpi_find_root_bridge(struct device *dev, acpi_handle *handle) { int num; unsigned int seg, bus; /* * The string should be the same as root bridge's name * Please look at 'pci_scan_bus_parented' */ num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus); if (num != 2) return -ENODEV; *handle = acpi_get_pci_rootbridge_handle(seg, bus); if (!*handle) return -ENODEV; return 0; } static struct acpi_bus_type pci_acpi_bus = { .bus = &pci_bus_type, .find_device = pci_acpi_find_device, .find_bridge = pci_acpi_find_root_bridge, }; static int __init pci_acpi_init(void) { int ret; ret = register_acpi_bus_type(&pci_acpi_bus); if (ret) return 0; platform_pci_choose_state = acpi_pci_choose_state; platform_pci_set_power_state = acpi_pci_set_power_state; return 0; } arch_initcall(pci_acpi_init);