diff options
author | Kristen Accardi <kristen.c.accardi@intel.com> | 2006-03-03 18:16:05 (GMT) |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-03-23 22:35:17 (GMT) |
commit | 783c49fc506d9afe4784390b556fa25ede5d6d1f (patch) | |
tree | 8090c2251193211129816254f16f10cbb33ed20c /drivers/pci/hotplug/acpi_pcihp.c | |
parent | f5afe8064f3087bead8fea7e32547c2a3ada5fd0 (diff) | |
download | linux-783c49fc506d9afe4784390b556fa25ede5d6d1f.tar.xz |
[PATCH] PCI Hotplug: add common acpi functions to core
shpchprm_acpi.c and pciehprm_acpi.c are nearly identical. In addition,
there are functions in both these files that are also in acpiphp_glue.c.
This patch will remove duplicate functions from shpchp, pciehp, and
acpiphp and move this functionality to pci_hotplug, as it is not
hardware specific. Get rid of shpchprm* and pciehprm* files since they
are no longer needed. shpchprm_nonacpi.c and pciehprm_nonacpi.c are
identical, as well as shpchprm_legacy.c and can be replaced with a
macro.
This patch also changes acpiphp to use the common hpp code.
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/pci/hotplug/acpi_pcihp.c')
-rw-r--r-- | drivers/pci/hotplug/acpi_pcihp.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/acpi_pcihp.c b/drivers/pci/hotplug/acpi_pcihp.c new file mode 100644 index 0000000..0f71353 --- /dev/null +++ b/drivers/pci/hotplug/acpi_pcihp.c @@ -0,0 +1,227 @@ +/* + * Common ACPI functions for hot plug platforms + * + * Copyright (C) 2006 Intel Corporation + * + * All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or (at + * your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for more + * details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * Send feedback to <kristen.c.accardi@intel.com> + * + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/pci.h> +#include <acpi/acpi.h> +#include <acpi/acpi_bus.h> +#include <acpi/actypes.h> +#include "pci_hotplug.h" + +#define METHOD_NAME__SUN "_SUN" +#define METHOD_NAME__HPP "_HPP" +#define METHOD_NAME_OSHP "OSHP" + +/* acpi_path_name + * + * @handle - the acpi_handle of the object who's name you want. + * + * Caller must free buffer. + */ +u8 * acpi_path_name(acpi_handle handle) +{ + acpi_status status; + struct acpi_buffer ret_buf = {ACPI_ALLOCATE_BUFFER, NULL}; + union acpi_object *obj; + + status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &ret_buf); + if (ACPI_FAILURE(status)) { + return NULL; + } + obj = ret_buf.pointer; + return obj->string.pointer; +} +EXPORT_SYMBOL_GPL(acpi_path_name); + + + +static acpi_status +acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp) +{ + acpi_status status; + u8 nui[4]; + struct acpi_buffer ret_buf = { 0, NULL}; + union acpi_object *ext_obj, *package; + u8 *path_name = acpi_path_name(handle); + int i, len = 0; + + /* get _hpp */ + status = acpi_evaluate_object(handle, METHOD_NAME__HPP, NULL, &ret_buf); + switch (status) { + case AE_BUFFER_OVERFLOW: + ret_buf.pointer = kmalloc (ret_buf.length, GFP_KERNEL); + if (!ret_buf.pointer) { + printk(KERN_ERR "%s:%s alloc for _HPP fail\n", + __FUNCTION__, path_name); + acpi_os_free(path_name); + return AE_NO_MEMORY; + } + status = acpi_evaluate_object(handle, METHOD_NAME__HPP, + NULL, &ret_buf); + if (ACPI_SUCCESS(status)) + break; + default: + if (ACPI_FAILURE(status)) { + pr_debug("%s:%s _HPP fail=0x%x\n", __FUNCTION__, + path_name, status); + acpi_os_free(path_name); + return status; + } + } + + ext_obj = (union acpi_object *) ret_buf.pointer; + if (ext_obj->type != ACPI_TYPE_PACKAGE) { + printk(KERN_ERR "%s:%s _HPP obj not a package\n", __FUNCTION__, + path_name); + status = AE_ERROR; + goto free_and_return; + } + + len = ext_obj->package.count; + package = (union acpi_object *) ret_buf.pointer; + for ( i = 0; (i < len) || (i < 4); i++) { + ext_obj = (union acpi_object *) &package->package.elements[i]; + switch (ext_obj->type) { + case ACPI_TYPE_INTEGER: + nui[i] = (u8)ext_obj->integer.value; + break; + default: + printk(KERN_ERR "%s:%s _HPP obj type incorrect\n", + __FUNCTION__, path_name); + status = AE_ERROR; + goto free_and_return; + } + } + + hpp->cache_line_size = nui[0]; + hpp->latency_timer = nui[1]; + hpp->enable_serr = nui[2]; + hpp->enable_perr = nui[3]; + + pr_debug(" _HPP: cache_line_size=0x%x\n", hpp->cache_line_size); + pr_debug(" _HPP: latency timer =0x%x\n", hpp->latency_timer); + pr_debug(" _HPP: enable SERR =0x%x\n", hpp->enable_serr); + pr_debug(" _HPP: enable PERR =0x%x\n", hpp->enable_perr); + +free_and_return: + acpi_os_free(path_name); + kfree(ret_buf.pointer); + return status; +} + + + +/* acpi_run_oshp - get control of hotplug from the firmware + * + * @handle - the handle of the hotplug controller. + */ +acpi_status acpi_run_oshp(acpi_handle handle) +{ + acpi_status status; + u8 *path_name = acpi_path_name(handle); + + /* run OSHP */ + status = acpi_evaluate_object(handle, METHOD_NAME_OSHP, NULL, NULL); + if (ACPI_FAILURE(status)) + printk(KERN_ERR "%s:%s OSHP fails=0x%x\n", __FUNCTION__, + path_name, status); + else + pr_debug("%s:%s OSHP passes\n", __FUNCTION__, path_name); + acpi_os_free(path_name); + return status; +} +EXPORT_SYMBOL_GPL(acpi_run_oshp); + + + +/* acpi_get_hp_params_from_firmware + * + * @dev - the pci_dev of the newly added device + * @hpp - allocated by the caller + */ +acpi_status acpi_get_hp_params_from_firmware(struct pci_dev *dev, + struct hotplug_params *hpp) +{ + acpi_status status = AE_NOT_FOUND; + struct pci_dev *pdev = dev; + + /* + * _HPP settings apply to all child buses, until another _HPP is + * encountered. If we don't find an _HPP for the input pci dev, + * look for it in the parent device scope since that would apply to + * this pci dev. If we don't find any _HPP, use hardcoded defaults + */ + while (pdev && (ACPI_FAILURE(status))) { + acpi_handle handle = DEVICE_ACPI_HANDLE(&(pdev->dev)); + if (!handle) + break; + status = acpi_run_hpp(handle, hpp); + if (!(pdev->bus->parent)) + break; + /* Check if a parent object supports _HPP */ + pdev = pdev->bus->parent->self; + } + return status; +} +EXPORT_SYMBOL_GPL(acpi_get_hp_params_from_firmware); + + +/* acpi_root_bridge - check to see if this acpi object is a root bridge + * + * @handle - the acpi object in question. + */ +int acpi_root_bridge(acpi_handle handle) +{ + acpi_status status; + struct acpi_device_info *info; + struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; + int i; + + status = acpi_get_object_info(handle, &buffer); + if (ACPI_SUCCESS(status)) { + info = buffer.pointer; + if ((info->valid & ACPI_VALID_HID) && + !strcmp(PCI_ROOT_HID_STRING, + info->hardware_id.value)) { + acpi_os_free(buffer.pointer); + return 1; + } + if (info->valid & ACPI_VALID_CID) { + for (i=0; i < info->compatibility_id.count; i++) { + if (!strcmp(PCI_ROOT_HID_STRING, + info->compatibility_id.id[i].value)) { + acpi_os_free(buffer.pointer); + return 1; + } + } + } + acpi_os_free(buffer.pointer); + } + return 0; +} +EXPORT_SYMBOL_GPL(acpi_root_bridge); |