2 * SHPCHPRM ACPI: PHP Resource Manager for ACPI platform
4 * Copyright (C) 2003-2004 Intel Corporation
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or (at
11 * your option) any later version.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
16 * NON INFRINGEMENT. See the GNU General Public License for more
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 * Send feedback to <kristen.c.accardi@intel.com>
27 #include <linux/module.h>
28 #include <linux/kernel.h>
29 #include <linux/types.h>
30 #include <linux/pci.h>
31 #include <acpi/acpi.h>
32 #include <acpi/acpi_bus.h>
33 #include <acpi/actypes.h>
36 #define METHOD_NAME__SUN "_SUN"
37 #define METHOD_NAME__HPP "_HPP"
38 #define METHOD_NAME_OSHP "OSHP"
40 static u8 * acpi_path_name( acpi_handle handle)
43 static u8 path_name[ACPI_PATHNAME_MAX];
44 struct acpi_buffer ret_buf = { ACPI_PATHNAME_MAX, path_name };
46 memset(path_name, 0, sizeof (path_name));
47 status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &ret_buf);
49 if (ACPI_FAILURE(status))
56 acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
60 struct acpi_buffer ret_buf = { 0, NULL};
61 union acpi_object *ext_obj, *package;
62 u8 *path_name = acpi_path_name(handle);
66 status = acpi_evaluate_object(handle, METHOD_NAME__HPP, NULL, &ret_buf);
68 case AE_BUFFER_OVERFLOW:
69 ret_buf.pointer = kmalloc (ret_buf.length, GFP_KERNEL);
70 if (!ret_buf.pointer) {
71 err ("%s:%s alloc for _HPP fail\n", __FUNCTION__,
75 status = acpi_evaluate_object(handle, METHOD_NAME__HPP,
77 if (ACPI_SUCCESS(status))
80 if (ACPI_FAILURE(status)) {
81 dbg("%s:%s _HPP fail=0x%x\n", __FUNCTION__,
87 ext_obj = (union acpi_object *) ret_buf.pointer;
88 if (ext_obj->type != ACPI_TYPE_PACKAGE) {
89 err ("%s:%s _HPP obj not a package\n", __FUNCTION__,
95 len = ext_obj->package.count;
96 package = (union acpi_object *) ret_buf.pointer;
97 for ( i = 0; (i < len) || (i < 4); i++) {
98 ext_obj = (union acpi_object *) &package->package.elements[i];
99 switch (ext_obj->type) {
100 case ACPI_TYPE_INTEGER:
101 nui[i] = (u8)ext_obj->integer.value;
104 err ("%s:%s _HPP obj type incorrect\n", __FUNCTION__,
107 goto free_and_return;
111 hpp->cache_line_size = nui[0];
112 hpp->latency_timer = nui[1];
113 hpp->enable_serr = nui[2];
114 hpp->enable_perr = nui[3];
116 dbg(" _HPP: cache_line_size=0x%x\n", hpp->cache_line_size);
117 dbg(" _HPP: latency timer =0x%x\n", hpp->latency_timer);
118 dbg(" _HPP: enable SERR =0x%x\n", hpp->enable_serr);
119 dbg(" _HPP: enable PERR =0x%x\n", hpp->enable_perr);
122 kfree(ret_buf.pointer);
126 static void acpi_run_oshp(acpi_handle handle)
129 u8 *path_name = acpi_path_name(handle);
132 status = acpi_evaluate_object(handle, METHOD_NAME_OSHP, NULL, NULL);
133 if (ACPI_FAILURE(status)) {
134 err("%s:%s OSHP fails=0x%x\n", __FUNCTION__, path_name,
137 dbg("%s:%s OSHP passes\n", __FUNCTION__, path_name);
141 int shpchprm_get_physical_slot_number(struct controller *ctrl, u32 *sun, u8 busnum, u8 devnum)
143 int offset = devnum - ctrl->slot_device_offset;
145 dbg("%s: ctrl->slot_num_inc %d, offset %d\n", __FUNCTION__, ctrl->slot_num_inc, offset);
146 *sun = (u8) (ctrl->first_slot + ctrl->slot_num_inc *offset);
150 void get_hp_hw_control_from_firmware(struct pci_dev *dev)
153 * OSHP is an optional ACPI firmware control method. If present,
154 * we need to run it to inform BIOS that we will control SHPC
155 * hardware from now on.
157 acpi_handle handle = DEVICE_ACPI_HANDLE(&(dev->dev));
160 acpi_run_oshp(handle);
163 void get_hp_params_from_firmware(struct pci_dev *dev,
164 struct hotplug_params *hpp)
166 acpi_status status = AE_NOT_FOUND;
167 struct pci_dev *pdev = dev;
170 * _HPP settings apply to all child buses, until another _HPP is
171 * encountered. If we don't find an _HPP for the input pci dev,
172 * look for it in the parent device scope since that would apply to
173 * this pci dev. If we don't find any _HPP, use hardcoded defaults
175 while (pdev && (ACPI_FAILURE(status))) {
176 acpi_handle handle = DEVICE_ACPI_HANDLE(&(pdev->dev));
179 status = acpi_run_hpp(handle, hpp);
180 if (!(pdev->bus->parent))
182 /* Check if a parent object supports _HPP */
183 pdev = pdev->bus->parent->self;