4  * SPDX-License-Identifier: Apache-2.0
23 #define STM32_BKP_REG_OFFSET		 (TAMP_BASE + offsetof(TAMP_TypeDef, BKP0R) - RTC_BASE)
27 #define STM32_BKP_REG_INDEX(offset)	 ((offset) >> 2)  argument
28 #define STM32_BKP_REG_BYTE_INDEX(offset) ((offset)&0x3UL)  argument
29 #define STM32_BKP_REG(i)		 (((volatile uint32_t *)config->base_addr)[(i)])
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()
43 	uint32_t reg, begin, to_copy;  in bbram_stm32_read()  local
45 	if (size < 1 || offset + size > config->size) {  in bbram_stm32_read()
46 		return -EFAULT;  in bbram_stm32_read()
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()
63 	uint32_t reg, begin, to_copy;  in bbram_stm32_write()  local
65 	if (size < 1 || offset + size > config->size) {  in bbram_stm32_write()
66 		return -EFAULT;  in bbram_stm32_write()
74 		reg = STM32_BKP_REG(STM32_BKP_REG_INDEX(offset + written));  in bbram_stm32_write()
75 		begin = STM32_BKP_REG_BYTE_INDEX(offset + written);  in bbram_stm32_write()
76 		to_copy = MIN(STM32_BKP_REG_BYTES - begin, size - written);  in bbram_stm32_write()
77 		bytecpy((uint8_t *)&reg + begin, data + written, to_copy);  in bbram_stm32_write()
78 		STM32_BKP_REG(STM32_BKP_REG_INDEX(offset + written)) = reg;  in bbram_stm32_write()
90 	const struct bbram_stm32_config *config = dev->config;  in bbram_stm32_get_size()
92 	*size = config->size;  in bbram_stm32_get_size()
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()