415 lines
11 KiB
C
415 lines
11 KiB
C
/*
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* Common ACPI functions for hot plug platforms
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*
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* Copyright (C) 2006 Intel Corporation
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to <kristen.c.accardi@intel.com>
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*
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/pci_hotplug.h>
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#include <acpi/acpi.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/actypes.h>
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#define MY_NAME "acpi_pcihp"
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#define dbg(fmt, arg...) do { if (debug_acpi) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __FUNCTION__ , ## arg); } while (0)
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#define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
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#define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
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#define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg)
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#define METHOD_NAME__SUN "_SUN"
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#define METHOD_NAME__HPP "_HPP"
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#define METHOD_NAME_OSHP "OSHP"
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static int debug_acpi;
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static acpi_status
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decode_type0_hpx_record(union acpi_object *record, struct hotplug_params *hpx)
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{
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int i;
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union acpi_object *fields = record->package.elements;
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u32 revision = fields[1].integer.value;
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switch (revision) {
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case 1:
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if (record->package.count != 6)
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return AE_ERROR;
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for (i = 2; i < 6; i++)
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if (fields[i].type != ACPI_TYPE_INTEGER)
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return AE_ERROR;
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hpx->t0 = &hpx->type0_data;
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hpx->t0->revision = revision;
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hpx->t0->cache_line_size = fields[2].integer.value;
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hpx->t0->latency_timer = fields[3].integer.value;
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hpx->t0->enable_serr = fields[4].integer.value;
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hpx->t0->enable_perr = fields[5].integer.value;
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break;
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default:
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printk(KERN_WARNING
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"%s: Type 0 Revision %d record not supported\n",
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__FUNCTION__, revision);
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return AE_ERROR;
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}
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return AE_OK;
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}
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static acpi_status
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decode_type1_hpx_record(union acpi_object *record, struct hotplug_params *hpx)
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{
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int i;
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union acpi_object *fields = record->package.elements;
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u32 revision = fields[1].integer.value;
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switch (revision) {
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case 1:
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if (record->package.count != 5)
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return AE_ERROR;
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for (i = 2; i < 5; i++)
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if (fields[i].type != ACPI_TYPE_INTEGER)
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return AE_ERROR;
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hpx->t1 = &hpx->type1_data;
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hpx->t1->revision = revision;
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hpx->t1->max_mem_read = fields[2].integer.value;
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hpx->t1->avg_max_split = fields[3].integer.value;
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hpx->t1->tot_max_split = fields[4].integer.value;
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break;
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default:
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printk(KERN_WARNING
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"%s: Type 1 Revision %d record not supported\n",
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__FUNCTION__, revision);
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return AE_ERROR;
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}
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return AE_OK;
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}
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static acpi_status
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decode_type2_hpx_record(union acpi_object *record, struct hotplug_params *hpx)
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{
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int i;
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union acpi_object *fields = record->package.elements;
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u32 revision = fields[1].integer.value;
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switch (revision) {
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case 1:
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if (record->package.count != 18)
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return AE_ERROR;
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for (i = 2; i < 18; i++)
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if (fields[i].type != ACPI_TYPE_INTEGER)
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return AE_ERROR;
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hpx->t2 = &hpx->type2_data;
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hpx->t2->revision = revision;
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hpx->t2->unc_err_mask_and = fields[2].integer.value;
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hpx->t2->unc_err_mask_or = fields[3].integer.value;
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hpx->t2->unc_err_sever_and = fields[4].integer.value;
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hpx->t2->unc_err_sever_or = fields[5].integer.value;
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hpx->t2->cor_err_mask_and = fields[6].integer.value;
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hpx->t2->cor_err_mask_or = fields[7].integer.value;
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hpx->t2->adv_err_cap_and = fields[8].integer.value;
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hpx->t2->adv_err_cap_or = fields[9].integer.value;
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hpx->t2->pci_exp_devctl_and = fields[10].integer.value;
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hpx->t2->pci_exp_devctl_or = fields[11].integer.value;
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hpx->t2->pci_exp_lnkctl_and = fields[12].integer.value;
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hpx->t2->pci_exp_lnkctl_or = fields[13].integer.value;
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hpx->t2->sec_unc_err_sever_and = fields[14].integer.value;
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hpx->t2->sec_unc_err_sever_or = fields[15].integer.value;
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hpx->t2->sec_unc_err_mask_and = fields[16].integer.value;
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hpx->t2->sec_unc_err_mask_or = fields[17].integer.value;
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break;
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default:
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printk(KERN_WARNING
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"%s: Type 2 Revision %d record not supported\n",
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__FUNCTION__, revision);
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return AE_ERROR;
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}
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return AE_OK;
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}
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static acpi_status
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acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx)
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{
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acpi_status status;
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struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
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union acpi_object *package, *record, *fields;
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u32 type;
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int i;
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/* Clear the return buffer with zeros */
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memset(hpx, 0, sizeof(struct hotplug_params));
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status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer);
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if (ACPI_FAILURE(status))
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return status;
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package = (union acpi_object *)buffer.pointer;
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if (package->type != ACPI_TYPE_PACKAGE) {
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status = AE_ERROR;
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goto exit;
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}
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for (i = 0; i < package->package.count; i++) {
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record = &package->package.elements[i];
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if (record->type != ACPI_TYPE_PACKAGE) {
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status = AE_ERROR;
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goto exit;
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}
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fields = record->package.elements;
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if (fields[0].type != ACPI_TYPE_INTEGER ||
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fields[1].type != ACPI_TYPE_INTEGER) {
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status = AE_ERROR;
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goto exit;
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}
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type = fields[0].integer.value;
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switch (type) {
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case 0:
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status = decode_type0_hpx_record(record, hpx);
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if (ACPI_FAILURE(status))
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goto exit;
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break;
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case 1:
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status = decode_type1_hpx_record(record, hpx);
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if (ACPI_FAILURE(status))
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goto exit;
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break;
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case 2:
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status = decode_type2_hpx_record(record, hpx);
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if (ACPI_FAILURE(status))
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goto exit;
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break;
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default:
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printk(KERN_ERR "%s: Type %d record not supported\n",
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__FUNCTION__, type);
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status = AE_ERROR;
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goto exit;
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}
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}
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exit:
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kfree(buffer.pointer);
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return status;
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}
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static acpi_status
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acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
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{
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acpi_status status;
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u8 nui[4];
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struct acpi_buffer ret_buf = { 0, NULL};
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struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object *ext_obj, *package;
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int i, len = 0;
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acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
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/* Clear the return buffer with zeros */
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memset(hpp, 0, sizeof(struct hotplug_params));
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/* get _hpp */
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status = acpi_evaluate_object(handle, METHOD_NAME__HPP, NULL, &ret_buf);
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switch (status) {
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case AE_BUFFER_OVERFLOW:
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ret_buf.pointer = kmalloc (ret_buf.length, GFP_KERNEL);
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if (!ret_buf.pointer) {
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printk(KERN_ERR "%s:%s alloc for _HPP fail\n",
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__FUNCTION__, (char *)string.pointer);
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kfree(string.pointer);
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return AE_NO_MEMORY;
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}
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status = acpi_evaluate_object(handle, METHOD_NAME__HPP,
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NULL, &ret_buf);
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if (ACPI_SUCCESS(status))
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break;
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default:
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if (ACPI_FAILURE(status)) {
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pr_debug("%s:%s _HPP fail=0x%x\n", __FUNCTION__,
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(char *)string.pointer, status);
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kfree(string.pointer);
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return status;
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}
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}
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ext_obj = (union acpi_object *) ret_buf.pointer;
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if (ext_obj->type != ACPI_TYPE_PACKAGE) {
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printk(KERN_ERR "%s:%s _HPP obj not a package\n", __FUNCTION__,
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(char *)string.pointer);
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status = AE_ERROR;
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goto free_and_return;
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}
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len = ext_obj->package.count;
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package = (union acpi_object *) ret_buf.pointer;
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for ( i = 0; (i < len) || (i < 4); i++) {
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ext_obj = (union acpi_object *) &package->package.elements[i];
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switch (ext_obj->type) {
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case ACPI_TYPE_INTEGER:
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nui[i] = (u8)ext_obj->integer.value;
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break;
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default:
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printk(KERN_ERR "%s:%s _HPP obj type incorrect\n",
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__FUNCTION__, (char *)string.pointer);
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status = AE_ERROR;
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goto free_and_return;
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}
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}
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hpp->t0 = &hpp->type0_data;
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hpp->t0->cache_line_size = nui[0];
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hpp->t0->latency_timer = nui[1];
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hpp->t0->enable_serr = nui[2];
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hpp->t0->enable_perr = nui[3];
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pr_debug(" _HPP: cache_line_size=0x%x\n", hpp->t0->cache_line_size);
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pr_debug(" _HPP: latency timer =0x%x\n", hpp->t0->latency_timer);
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pr_debug(" _HPP: enable SERR =0x%x\n", hpp->t0->enable_serr);
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pr_debug(" _HPP: enable PERR =0x%x\n", hpp->t0->enable_perr);
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free_and_return:
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kfree(string.pointer);
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kfree(ret_buf.pointer);
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return status;
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}
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/* acpi_run_oshp - get control of hotplug from the firmware
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*
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* @handle - the handle of the hotplug controller.
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*/
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acpi_status acpi_run_oshp(acpi_handle handle)
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{
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acpi_status status;
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struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL };
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acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
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/* run OSHP */
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status = acpi_evaluate_object(handle, METHOD_NAME_OSHP, NULL, NULL);
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if (ACPI_FAILURE(status))
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if (status != AE_NOT_FOUND)
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printk(KERN_ERR "%s:%s OSHP fails=0x%x\n",
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__FUNCTION__, (char *)string.pointer, status);
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else
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dbg("%s:%s OSHP not found\n",
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__FUNCTION__, (char *)string.pointer);
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else
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pr_debug("%s:%s OSHP passes\n", __FUNCTION__,
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(char *)string.pointer);
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kfree(string.pointer);
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return status;
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}
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EXPORT_SYMBOL_GPL(acpi_run_oshp);
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/* acpi_get_hp_params_from_firmware
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*
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* @bus - the pci_bus of the bus on which the device is newly added
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* @hpp - allocated by the caller
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*/
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acpi_status acpi_get_hp_params_from_firmware(struct pci_bus *bus,
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struct hotplug_params *hpp)
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{
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acpi_status status = AE_NOT_FOUND;
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acpi_handle handle, phandle;
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struct pci_bus *pbus = bus;
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struct pci_dev *pdev;
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do {
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pdev = pbus->self;
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if (!pdev) {
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handle = acpi_get_pci_rootbridge_handle(
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pci_domain_nr(pbus), pbus->number);
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break;
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}
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handle = DEVICE_ACPI_HANDLE(&(pdev->dev));
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pbus = pbus->parent;
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} while (!handle);
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/*
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* _HPP settings apply to all child buses, until another _HPP is
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* encountered. If we don't find an _HPP for the input pci dev,
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* look for it in the parent device scope since that would apply to
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* this pci dev. If we don't find any _HPP, use hardcoded defaults
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*/
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while (handle) {
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status = acpi_run_hpx(handle, hpp);
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if (ACPI_SUCCESS(status))
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break;
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status = acpi_run_hpp(handle, hpp);
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if (ACPI_SUCCESS(status))
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break;
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if (acpi_root_bridge(handle))
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break;
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status = acpi_get_parent(handle, &phandle);
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if (ACPI_FAILURE(status))
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break;
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handle = phandle;
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}
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return status;
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}
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EXPORT_SYMBOL_GPL(acpi_get_hp_params_from_firmware);
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/* acpi_root_bridge - check to see if this acpi object is a root bridge
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*
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* @handle - the acpi object in question.
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*/
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int acpi_root_bridge(acpi_handle handle)
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{
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acpi_status status;
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struct acpi_device_info *info;
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struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
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int i;
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status = acpi_get_object_info(handle, &buffer);
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if (ACPI_SUCCESS(status)) {
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info = buffer.pointer;
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if ((info->valid & ACPI_VALID_HID) &&
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!strcmp(PCI_ROOT_HID_STRING,
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info->hardware_id.value)) {
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kfree(buffer.pointer);
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return 1;
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}
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if (info->valid & ACPI_VALID_CID) {
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for (i=0; i < info->compatibility_id.count; i++) {
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if (!strcmp(PCI_ROOT_HID_STRING,
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info->compatibility_id.id[i].value)) {
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kfree(buffer.pointer);
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return 1;
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}
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}
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}
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kfree(buffer.pointer);
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(acpi_root_bridge);
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module_param(debug_acpi, bool, 0644);
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MODULE_PARM_DESC(debug_acpi, "Debugging mode for ACPI enabled or not");
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