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/* Copyright (c) 2013-2014, 2016, 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/kernel.h>
#include <linux/random.h>
#include <soc/qcom/scm.h>
#include <asm/io.h>
#include <asm/cacheflush.h>
#define TZ_SVC_CRYPTO 10
#define PRNG_CMD_ID 0x01
struct tz_prng_data {
uint8_t *out_buf;
uint32_t out_buf_sz;
} __packed;
DEFINE_SCM_BUFFER(common_scm_buf)
#define RANDOM_BUFFER_SIZE PAGE_SIZE
char random_buffer[RANDOM_BUFFER_SIZE] __aligned(PAGE_SIZE);
void __init init_random_pool(void)
{
struct tz_prng_data data;
int ret;
u32 resp;
struct scm_desc desc;
data.out_buf = (uint8_t *) virt_to_phys(random_buffer);
desc.args[0] = (unsigned long) data.out_buf;
desc.args[1] = data.out_buf_sz = SZ_512;
desc.arginfo = SCM_ARGS(2, SCM_RW, SCM_VAL);
dmac_flush_range(random_buffer, random_buffer + RANDOM_BUFFER_SIZE);
if (!is_scm_armv8())
ret = scm_call_noalloc(TZ_SVC_CRYPTO, PRNG_CMD_ID, &data,
sizeof(data), &resp, sizeof(resp),
common_scm_buf,
SCM_BUFFER_SIZE(common_scm_buf));
else
ret = scm_call2(SCM_SIP_FNID(TZ_SVC_CRYPTO, PRNG_CMD_ID),
&desc);
if (!ret) {
dmac_inv_range(random_buffer, random_buffer +
RANDOM_BUFFER_SIZE);
add_device_randomness(random_buffer, SZ_512);
}
}
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