mirror of
https://github.com/zephyrproject-rtos/zephyr
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acf1939a4c
Convert entropy drivers to use new DT variants of the DEVICE APIs.
DEVICE_AND_API_INIT -> DEVICE_DT_DEFINE
DEVICE_GET -> DEVICE_DT_GET
etc..
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
/*
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* Copyright (c) 2017 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT espressif_esp32_trng
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#include <string.h>
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#include <drivers/entropy.h>
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static inline uint32_t entropy_esp32_get_u32(void)
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{
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/*
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* APB Address: 0x60035144 (Safe,slower writes)
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* DPORT Address: 0x3ff75144 (write bug, fast writes)
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* In this case it won't make a difference because it is read only
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* More info available at:
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* https://www.esp32.com/viewtopic.php?f=2&t=3033&p=14227
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* also check: ECO and Workarounds for Bugs Document, point 3.3
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*/
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volatile uint32_t *rng_data_reg = (uint32_t *)DT_INST_REG_ADDR(0);
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/* Read just once. This is not optimal as the generator has
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* limited throughput due to scarce sources of entropy, specially
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* with the radios turned off. Might want to revisit this.
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*/
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return *rng_data_reg;
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}
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static int entropy_esp32_get_entropy(const struct device *device,
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uint8_t *buf, uint16_t len)
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{
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while (len) {
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uint32_t v = entropy_esp32_get_u32();
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if (len >= sizeof(v)) {
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memcpy(buf, &v, sizeof(v));
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buf += sizeof(v);
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len -= sizeof(v);
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} else {
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memcpy(buf, &v, len);
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break;
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}
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}
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return 0;
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}
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static int entropy_esp32_init(const struct device *device)
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{
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return 0;
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}
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static struct entropy_driver_api entropy_esp32_api_funcs = {
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.get_entropy = entropy_esp32_get_entropy
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};
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DEVICE_DT_INST_DEFINE(0,
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entropy_esp32_init, device_pm_control_nop, NULL, NULL,
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PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
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&entropy_esp32_api_funcs);
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