diff options
Diffstat (limited to 'atmel-samd/asf4/samd51/hpl/trng/hpl_trng.c')
| -rw-r--r-- | atmel-samd/asf4/samd51/hpl/trng/hpl_trng.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/atmel-samd/asf4/samd51/hpl/trng/hpl_trng.c b/atmel-samd/asf4/samd51/hpl/trng/hpl_trng.c new file mode 100644 index 000000000..2b1f35a16 --- /dev/null +++ b/atmel-samd/asf4/samd51/hpl/trng/hpl_trng.c @@ -0,0 +1,120 @@ +/** + * \file + * + * \brief True Random Number Generator + * + * Copyright (C) 2015-2016 Atmel Corporation. All rights reserved. + * + * \asf_license_start + * + * \page License + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * 3. The name of Atmel may not be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * 4. This software may only be redistributed and used in connection with an + * Atmel microcontroller product. + * + * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE + * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR + * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + * \asf_license_stop + * + */ + +#include <err_codes.h> +#include <hpl_rand_sync.h> +#include <hpl_trng_config.h> +#include <utils_assert.h> + +static inline int32_t _trng_init(void *hw) +{ + if (hri_trng_get_CTRLA_reg(hw, TRNG_CTRLA_ENABLE)) { + return ERR_DENIED; + } + if (CONF_TRNG_RUNSTDBY) { + hri_trng_set_CTRLA_RUNSTDBY_bit(hw); + } else { + hri_trng_clear_CTRLA_RUNSTDBY_bit(hw); + } + if (CONF_TRNG_DATARDYEO) { + hri_trng_set_EVCTRL_DATARDYEO_bit(hw); + } else { + hri_trng_clear_EVCTRL_DATARDYEO_bit(hw); + } + return ERR_NONE; +} + +int32_t _rand_sync_init(struct _rand_sync_dev *const dev, void *const hw) +{ + int32_t rc; + + ASSERT(dev && hw); + + rc = _trng_init(hw); + if (rc == ERR_NONE) { + dev->prvt = hw; + dev->n_bits = 32; + } + return rc; +} + +void _rand_sync_deinit(struct _rand_sync_dev *const dev) +{ + _rand_sync_disable(dev); +} + +int32_t _rand_sync_enable(struct _rand_sync_dev *const dev) +{ + ASSERT(dev); + ASSERT(dev->prvt); + + hri_trng_set_CTRLA_ENABLE_bit(dev->prvt); + return ERR_NONE; +} + +void _rand_sync_disable(struct _rand_sync_dev *const dev) +{ + ASSERT(dev); + ASSERT(dev->prvt); + + hri_trng_clear_CTRLA_ENABLE_bit(dev->prvt); +} + +int32_t _rand_sync_set_seed(struct _rand_sync_dev *const dev, const uint32_t seed) +{ + (void)dev; + (void)seed; + return ERR_UNSUPPORTED_OP; +} + +uint32_t _rand_sync_read_one(const struct _rand_sync_dev *const dev) +{ + ASSERT(dev); + ASSERT(dev->prvt); + ASSERT(hri_trng_get_CTRLA_reg(dev->prvt, TRNG_CTRLA_ENABLE)); + + while (!hri_trng_get_INTFLAG_reg(dev->prvt, TRNG_INTFLAG_DATARDY)) { + /* Wait until data ready. */ + } + return hri_trng_read_DATA_reg(dev->prvt); +} |