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/*
* Copyright (c) 2020, The Linux Foundation. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <stddef.h>
#include <lib/mmio.h>
#include <qti_rng.h>
#include <qti_rng_io.h>
int qti_rng_get_data(uint8_t *out, uint32_t out_len)
{
uint32_t tmp_rndm = 0;
uint32_t bytes_left = out_len;
int i = 0;
if (NULL == out || 0 == out_len) {
return -1;
}
/*
* RNG HW initialized at previous boot image.
* RNG clocks are expected to be ON.
*/
do {
/* There is no data to read */
if ((mmio_read_32(SEC_PRNG_STATUS) &
SEC_PRNG_STATUS_DATA_AVAIL_BMSK) == 0) {
continue;
}
while ((tmp_rndm = mmio_read_32(SEC_PRNG_DATA_OUT)) == 0) {
;
}
for (i = 0; i < 4; i++) {
*out = (uint8_t) (tmp_rndm >> (8 * i));
out++;
bytes_left--;
if (bytes_left == 0) {
break;
}
}
} while (bytes_left != 0);
return 0;
}
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