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/* Copyright (c) 2015-2018, The Linux Foundation. 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 version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/async.h>
#include <linux/mm.h>
#include <linux/of.h>
#include <soc/qcom/scm.h>
#include <linux/device-mapper.h>
#include <soc/qcom/qseecomi.h>
#include <crypto/ice.h>
#include "pfk_ice.h"
#define TZ_ES_CONFIG_SET_ICE_KEY 0x4
#define TZ_ES_INVALIDATE_ICE_KEY 0x3
/* index 0 and 1 is reserved for FDE */
#define MIN_ICE_KEY_INDEX 2
#define MAX_ICE_KEY_INDEX 31
#define TZ_ES_CONFIG_SET_ICE_KEY_ID \
TZ_SYSCALL_CREATE_SMC_ID(TZ_OWNER_SIP, TZ_SVC_ES, \
TZ_ES_CONFIG_SET_ICE_KEY)
#define TZ_ES_INVALIDATE_ICE_KEY_ID \
TZ_SYSCALL_CREATE_SMC_ID(TZ_OWNER_SIP, \
TZ_SVC_ES, TZ_ES_INVALIDATE_ICE_KEY)
#define TZ_ES_CONFIG_SET_ICE_KEY_PARAM_ID \
TZ_SYSCALL_CREATE_PARAM_ID_5( \
TZ_SYSCALL_PARAM_TYPE_VAL, \
TZ_SYSCALL_PARAM_TYPE_BUF_RW, TZ_SYSCALL_PARAM_TYPE_VAL, \
TZ_SYSCALL_PARAM_TYPE_VAL, TZ_SYSCALL_PARAM_TYPE_VAL)
#define TZ_ES_INVALIDATE_ICE_KEY_PARAM_ID \
TZ_SYSCALL_CREATE_PARAM_ID_1( \
TZ_SYSCALL_PARAM_TYPE_VAL)
#define ICE_BUFFER_SIZE 64
enum {
TZ_CIPHER_MODE_XTS_128 = 0,
TZ_CIPHER_MODE_CBC_128 = 1,
TZ_CIPHER_MODE_XTS_256 = 3,
TZ_CIPHER_MODE_CBC_256 = 4
};
static uint8_t ice_buffer[ICE_BUFFER_SIZE];
int qti_pfk_ice_set_key(uint32_t index, uint8_t *key, uint8_t *salt,
char *storage_type, unsigned int data_unit)
{
struct scm_desc desc = {0};
int ret, ret1;
char *tzbuf = (char *)ice_buffer;
char *s_type = storage_type;
uint32_t smc_id = 0;
u32 size = ICE_BUFFER_SIZE / 2;
if (index < MIN_ICE_KEY_INDEX || index > MAX_ICE_KEY_INDEX) {
pr_err("%s Invalid index %d\n", __func__, index);
return -EINVAL;
}
if (!key || !salt) {
pr_err("%s Invalid key/salt\n", __func__);
return -EINVAL;
}
if (!tzbuf) {
pr_err("%s No Memory\n", __func__);
return -ENOMEM;
}
if (s_type == NULL) {
pr_err("%s Invalid Storage type\n", __func__);
return -EINVAL;
}
memset(tzbuf, 0, ICE_BUFFER_SIZE);
memcpy(ice_buffer, key, size);
memcpy(ice_buffer + size, salt, size);
dmac_flush_range(tzbuf, tzbuf + ICE_BUFFER_SIZE);
smc_id = TZ_ES_CONFIG_SET_ICE_KEY_ID;
desc.arginfo = TZ_ES_CONFIG_SET_ICE_KEY_PARAM_ID;
desc.args[0] = index;
desc.args[1] = virt_to_phys(tzbuf);
desc.args[2] = ICE_BUFFER_SIZE;
desc.args[3] = TZ_CIPHER_MODE_XTS_256;
desc.args[4] = data_unit;
ret = qcom_ice_setup_ice_hw((const char *)s_type, true);
if (ret) {
pr_err("%s: could not enable clocks: %d\n", __func__, ret);
goto out;
}
ret = scm_call2_noretry(smc_id, &desc);
if (ret) {
pr_err("%s: Set Key Error: %d\n", __func__, ret);
if (ret == -EBUSY) {
if (qcom_ice_setup_ice_hw((const char *)s_type, false))
pr_err("%s: clock disable failed\n", __func__);
goto out;
}
/*Try to invalidate the key to keep ICE in proper state*/
smc_id = TZ_ES_INVALIDATE_ICE_KEY_ID;
desc.arginfo = TZ_ES_INVALIDATE_ICE_KEY_PARAM_ID;
desc.args[0] = index;
ret1 = scm_call2_noretry(smc_id, &desc);
if (ret1)
pr_err("%s: Invalidate Key Error: %d\n", __func__,
ret1);
}
ret1 = qcom_ice_setup_ice_hw((const char *)s_type, false);
if (ret1)
pr_err("%s: Error %d disabling clocks\n", __func__, ret1);
out:
return ret;
}
int qti_pfk_ice_invalidate_key(uint32_t index, char *storage_type)
{
struct scm_desc desc = {0};
int ret;
uint32_t smc_id = 0;
if (index < MIN_ICE_KEY_INDEX || index > MAX_ICE_KEY_INDEX) {
pr_err("%s Invalid index %d\n", __func__, index);
return -EINVAL;
}
if (storage_type == NULL) {
pr_err("%s Invalid Storage type\n", __func__);
return -EINVAL;
}
smc_id = TZ_ES_INVALIDATE_ICE_KEY_ID;
desc.arginfo = TZ_ES_INVALIDATE_ICE_KEY_PARAM_ID;
desc.args[0] = index;
ret = qcom_ice_setup_ice_hw((const char *)storage_type, true);
if (ret) {
pr_err("%s: could not enable clocks: 0x%x\n", __func__, ret);
return ret;
}
ret = scm_call2_noretry(smc_id, &desc);
if (ret) {
pr_err("%s: Error: 0x%x\n", __func__, ret);
if (qcom_ice_setup_ice_hw((const char *)storage_type, false))
pr_err("%s: could not disable clocks\n", __func__);
} else {
ret = qcom_ice_setup_ice_hw((const char *)storage_type, false);
}
return ret;
}
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