4  * SPDX-License-Identifier: Apache-2.0
37 	      (CONFIG_ENTROPY_SMARTBOND_ISR_POOL_SIZE - 1)) == 0,
41 	      (CONFIG_ENTROPY_SMARTBOND_THR_POOL_SIZE - 1)) == 0,
86 		CRG_TOP->CLK_AMBA_REG |= CRG_TOP_CLK_AMBA_REG_TRNG_CLK_ENABLE_Msk;  in trng_enable()
87 		TRNG->TRNG_CTRL_REG = TRNG_TRNG_CTRL_REG_TRNG_ENABLE_Msk;  in trng_enable()
95 		CRG_TOP->CLK_AMBA_REG &= ~CRG_TOP_CLK_AMBA_REG_TRNG_CLK_ENABLE_Msk;  in trng_enable()
96 		TRNG->TRNG_CTRL_REG = 0;  in trng_enable()
106 	return TRNG->TRNG_FIFOLVL_REG & FIFO_COUNT_MASK;  in trng_available()
114 static int random_word_get(uint8_t buf[4])  in random_word_get()  argument
116 	uint32_t word = 0;  in random_word_get()  local
117 	int retval = -EAGAIN;  in random_word_get()
123 		word = trng_fifo_read();  in random_word_get()
129 	buf[0] = (uint8_t)word;  in random_word_get()
130 	buf[1] = (uint8_t)(word >> 8);  in random_word_get()
131 	buf[2] = (uint8_t)(word >> 16);  in random_word_get()
132 	buf[3] = (uint8_t)(word >> 24);  in random_word_get()
139 	uint32_t last = rngp->last;  in rng_pool_get()
140 	uint32_t mask = rngp->mask;  in rng_pool_get()
147 	first = rngp->first_alloc;  in rng_pool_get()
150 	 * The other_read_in_progress is non-zero if rngp->first_read != first,  in rng_pool_get()
151 	 * which means that lower-priority code (which was interrupted by this  in rng_pool_get()
154 	other_read_in_progress = (rngp->first_read ^ first);  in rng_pool_get()
156 	available = (last - first) & mask;  in rng_pool_get()
165 	rngp->first_alloc = (first + len) & mask;  in rng_pool_get()
168 	while (likely(len--)) {  in rng_pool_get()
169 		*dst++ = rngp->buffer[first];  in rng_pool_get()
180 		rngp->first_read = rngp->first_alloc;  in rng_pool_get()
184 	len = dst - buf;  in rng_pool_get()
185 	available = available - len;  in rng_pool_get()
186 	if (available <= rngp->threshold) {  in rng_pool_get()
195 	uint8_t first = rngp->first_read;  in rng_pool_put()
196 	uint8_t last = rngp->last;  in rng_pool_put()
197 	uint8_t mask = rngp->mask;  in rng_pool_put()
200 	if (((last - first) & mask) == mask) {  in rng_pool_put()
201 		return -ENOBUFS;  in rng_pool_put()
204 	rngp->buffer[last] = byte;  in rng_pool_put()
205 	rngp->last = (last + 1) & mask;  in rng_pool_put()
228 	rngp->first_alloc = 0U;  in rng_pool_init()
229 	rngp->first_read = 0U;  in rng_pool_init()
230 	rngp->last = 0U;  in rng_pool_init()
231 	rngp->mask = size - 1;  in rng_pool_init()
232 	rngp->threshold = threshold;  in rng_pool_init()
237 	uint8_t word[4];  in smartbond_trng_isr()  local
238 	const uint8_t *const limit = word + 4;  in smartbond_trng_isr()
245 		if (random_word_get(word) < 0) {  in smartbond_trng_isr()
246 			/* Nothing in FIFO -> nothing to do */  in smartbond_trng_isr()
249 		ptr = word;  in smartbond_trng_isr()
275 	__ASSERT_NO_MSG(&entropy_smartbond_data == dev->data);  in entropy_smartbond_get_entropy()
290 		len -= bytes;  in entropy_smartbond_get_entropy()
304 	__ASSERT_NO_MSG(&entropy_smartbond_data == dev->data);  in entropy_smartbond_get_entropy_isr()
322 		 * RNG event will set the Cortex-M single-bit event register  in entropy_smartbond_get_entropy_isr()
329 			uint8_t bytes[4];  in entropy_smartbond_get_entropy_isr()
331 			const uint8_t *const limit = bytes + 4;  in entropy_smartbond_get_entropy_isr()
336 				 * SEV-On-Pend feature must be enabled (enabled  in entropy_smartbond_get_entropy_isr()
354 				buf[--len] = *ptr++;  in entropy_smartbond_get_entropy_isr()
391 		ret = -ENOTSUP;  in entropy_smartbond_pm_action()
405 	__ASSERT_NO_MSG(&entropy_smartbond_data == dev->data);  in entropy_smartbond_init()