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/* Copyright 2013-2016 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <skiboot.h>
#include <device.h>
#include <string.h>
#include "status_codes.h"
#include "container.h"
#include "tpm_chip.h"
#include "drivers/tpm_i2c_nuvoton.h"
static struct list_head tpm_list = LIST_HEAD_INIT(tpm_list);
int tpm_register_chip(struct dt_node *node, struct tpm_dev *dev,
struct tpm_driver *driver)
{
int i, rc;
uint64_t sml_base;
uint32_t sml_size;
struct tpm_chip *tpm;
i = 0;
list_for_each(&tpm_list, tpm, link) {
if (tpm->node == node) {
/**
* @fwts-label TPMAlreadyRegistered
* @fwts-advice TPM node already registered. The same
* node is being registered twice or there is a
* tpm node duplicate in the device tree
*/
prlog(PR_WARNING, "TPM: tpm%d already registered\n",
tpm->id);
return STB_ERROR;
}
i++;
}
tpm = (struct tpm_chip*) malloc(sizeof(struct tpm_chip));
assert(tpm);
tpm->id = i;
/*
* Read event log info from the tpm device tree node. Both
* linux,sml-base and linux,sml-size properties are documented in
* 'doc/device-tree/tpm.rst'
*/
sml_base = dt_prop_get_u64_def(node, "linux,sml-base", 0);
/* Check if sml-base is really 0 or it just doesn't exist */
if (!sml_base &&
!dt_find_property(node, "linux,sml-base")) {
/**
* @fwts-label TPMSmlBaseNotFound
* @fwts-advice linux,sml-base property not found. This
* indicates a Hostboot bug if the property really
* doesn't exist in the tpm node.
*/
prlog(PR_ERR, "TPM: linux,sml-base property not found "
"tpm node %p\n", node);
goto disable;
}
sml_size = dt_prop_get_u32_def(node, "linux,sml-size", 0);
if (!sml_size) {
/**
* @fwts-label TPMSmlSizeNotFound
* @fwts-advice linux,sml-size property not found. This
* indicates a Hostboot bug if the property really
* doesn't exist in the tpm node.
*/
prlog(PR_ERR, "TPM: linux,sml-size property not found, "
"tpm node %p\n", node);
goto disable;
}
/*
* Initialize the event log manager by walking through the log to identify
* what is the next free position in the log
*/
rc = TpmLogMgr_initializeUsingExistingLog(&tpm->logmgr,
(uint8_t*) sml_base, sml_size);
if (rc) {
/**
* @fwts-label TPMInitEventLogFailed
* @fwts-advice Hostboot creates and adds entries to the
* event log. The failed init function is part of hostboot,
* but the source code is shared with skiboot. If the hostboot
* TpmLogMgr code (or friends) has been updated, the changes
* need to be applied to skiboot as well.
*/
prlog(PR_ERR, "TPM: eventlog init failed: tpm%d rc=%d",
tpm->id, rc);
goto disable;
}
tpm->enabled = true;
tpm->node = node;
tpm->dev = dev;
tpm->driver = driver;
list_add_tail(&tpm_list, &tpm->link);
prlog(PR_NOTICE, "TPM: tpm%d registered: driver=%s felsz=%d\n",
tpm->id, tpm->driver->name, tpm->logmgr.logSize);
return 0;
disable:
dt_add_property_string(node, "status", "disabled");
prlog(PR_NOTICE, "TPM: tpm node %p disabled\n", node);
free(tpm);
return STB_ERROR;
}
void tpm_init(void)
{
if (!list_empty(&tpm_list)) {
/**
* @fwts-label TPMAlreadyInitialized
* @fwts-advice TPM already initialized. Check if tpm is being
* initialized more than once.
*/
prlog(PR_WARNING, "TPM: tpm device(s) already initialized\n");
return;
}
list_head_init(&tpm_list);
/* tpm drivers supported */
tpm_i2c_nuvoton_probe();
if (list_empty(&tpm_list))
/**
* @fwts-label TPMNotInitialized
* @fwts-advice No TPM chip has been initialized. We may not
* have a compatible tpm driver or there is no tpm node in the
* device tree with the expected bindings.
*/
prlog(PR_ERR, "TPM: no tpm chip has been initialized\n");
}
void tpm_cleanup(void)
{
struct tpm_chip *tpm = NULL;
tpm = list_pop(&tpm_list, struct tpm_chip, link);
while (tpm) {
/* deallocate memory */
if (tpm->dev)
free(tpm->dev);
tpm->driver = NULL;
free(tpm);
tpm = list_pop(&tpm_list, struct tpm_chip, link);
}
list_head_init(&tpm_list);
}
void tpm_add_status_property(void) {
struct tpm_chip *tpm;
list_for_each(&tpm_list, tpm, link) {
dt_add_property_string(tpm->node, "status",
tpm->enabled ? "okay" : "disabled");
}
}
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