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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"
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;
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;
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\n",
tpm->id, tpm->driver->name);
return 0;
}
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 */
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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