diff options
Diffstat (limited to 'drivers/pci/pci-acpi.c')
| -rw-r--r-- | drivers/pci/pci-acpi.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c new file mode 100644 index 000000000000..968eb32f292d --- /dev/null +++ b/drivers/pci/pci-acpi.c @@ -0,0 +1,209 @@ +/* + * File: pci-acpi.c + * Purpose: Provide PCI supports in ACPI + * + * Copyright (C) 2004 Intel + * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com) + */ + +#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> + +static u32 ctrlset_buf[3] = {0, 0, 0}; +static u32 global_ctrlsets = 0; +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, + 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) { + 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 + * @flags: driver's requested control bits + * + * Attempt to take control from Firmware on requested control bits. + **/ +acpi_status pci_osc_control_set(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_get_devices ( PCI_ROOT_HID_STRING, + acpi_run_osc, + ctrlset_buf, + NULL ); + if (ACPI_FAILURE (status)) { + ctrlset_buf[OSC_CONTROL_TYPE] &= ~ctrlset; + } + + return status; +} +EXPORT_SYMBOL(pci_osc_control_set); |