4  * SPDX-License-Identifier: Apache-2.0
23 #define STM32_BKP_REG_OFFSET		 (TAMP_BASE + offsetof(TAMP_TypeDef, BKP0R) - RTC_BASE)
29 #define STM32_BKP_REG(i)		 (((volatile uint32_t *)config->base_addr)[(i)])
36 	/* BBRAM size in bytes. */
37 	int size;  member
40 static int bbram_stm32_read(const struct device *dev, size_t offset, size_t size, uint8_t *data)  in bbram_stm32_read()  argument
42 	const struct bbram_stm32_config *config = dev->config;  in bbram_stm32_read()
45 	if (size < 1 || offset + size > config->size) {  in bbram_stm32_read()
46 		return -EFAULT;  in bbram_stm32_read()
49 	for (size_t read = 0; read < size; read += to_copy) {  in bbram_stm32_read()  local
50 		reg = STM32_BKP_REG(STM32_BKP_REG_INDEX(offset + read));  in bbram_stm32_read()
51 		begin = STM32_BKP_REG_BYTE_INDEX(offset + read);  in bbram_stm32_read()
52 		to_copy = MIN(STM32_BKP_REG_BYTES - begin, size - read);  in bbram_stm32_read()
53 		bytecpy(data + read, (uint8_t *)&reg + begin, to_copy);  in bbram_stm32_read()
59 static int bbram_stm32_write(const struct device *dev, size_t offset, size_t size,  in bbram_stm32_write()  argument
62 	const struct bbram_stm32_config *config = dev->config;  in bbram_stm32_write()
65 	if (size < 1 || offset + size > config->size) {  in bbram_stm32_write()
66 		return -EFAULT;  in bbram_stm32_write()
73 	for (size_t written = 0; written < size; written += to_copy) {  in bbram_stm32_write()
76 		to_copy = MIN(STM32_BKP_REG_BYTES - begin, size - written);  in bbram_stm32_write()
88 static int bbram_stm32_get_size(const struct device *dev, size_t *size)  in bbram_stm32_get_size()  argument
90 	const struct bbram_stm32_config *config = dev->config;  in bbram_stm32_get_size()
92 	*size = config->size;  in bbram_stm32_get_size()
98 	.read = bbram_stm32_read,
105 	const struct bbram_stm32_config *config = dev->config;  in bbram_stm32_init()
107 	if (!device_is_ready(config->parent)) {  in bbram_stm32_init()
108 		LOG_ERR("Device %s is not ready", config->parent->name);  in bbram_stm32_init()
109 		return -ENODEV;  in bbram_stm32_init()
119 		.size = DT_INST_PROP(inst, st_backup_regs) * STM32_BKP_REG_BYTES,                  \