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Diffstat (limited to '')
| -rw-r--r-- | include/drivers/st/stm32_i2c.h | 321 |
1 files changed, 321 insertions, 0 deletions
diff --git a/include/drivers/st/stm32_i2c.h b/include/drivers/st/stm32_i2c.h new file mode 100644 index 0000000..170d4cf --- /dev/null +++ b/include/drivers/st/stm32_i2c.h @@ -0,0 +1,321 @@ +/* + * Copyright (c) 2016-2019, STMicroelectronics - All Rights Reserved + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#ifndef STM32_I2C_H +#define STM32_I2C_H + +#include <stdint.h> + +#include <lib/utils_def.h> + +/* Bit definition for I2C_CR1 register */ +#define I2C_CR1_PE BIT(0) +#define I2C_CR1_TXIE BIT(1) +#define I2C_CR1_RXIE BIT(2) +#define I2C_CR1_ADDRIE BIT(3) +#define I2C_CR1_NACKIE BIT(4) +#define I2C_CR1_STOPIE BIT(5) +#define I2C_CR1_TCIE BIT(6) +#define I2C_CR1_ERRIE BIT(7) +#define I2C_CR1_DNF GENMASK(11, 8) +#define I2C_CR1_ANFOFF BIT(12) +#define I2C_CR1_SWRST BIT(13) +#define I2C_CR1_TXDMAEN BIT(14) +#define I2C_CR1_RXDMAEN BIT(15) +#define I2C_CR1_SBC BIT(16) +#define I2C_CR1_NOSTRETCH BIT(17) +#define I2C_CR1_WUPEN BIT(18) +#define I2C_CR1_GCEN BIT(19) +#define I2C_CR1_SMBHEN BIT(22) +#define I2C_CR1_SMBDEN BIT(21) +#define I2C_CR1_ALERTEN BIT(22) +#define I2C_CR1_PECEN BIT(23) + +/* Bit definition for I2C_CR2 register */ +#define I2C_CR2_SADD GENMASK(9, 0) +#define I2C_CR2_RD_WRN BIT(10) +#define I2C_CR2_RD_WRN_OFFSET 10U +#define I2C_CR2_ADD10 BIT(11) +#define I2C_CR2_HEAD10R BIT(12) +#define I2C_CR2_START BIT(13) +#define I2C_CR2_STOP BIT(14) +#define I2C_CR2_NACK BIT(15) +#define I2C_CR2_NBYTES GENMASK(23, 16) +#define I2C_CR2_NBYTES_OFFSET 16U +#define I2C_CR2_RELOAD BIT(24) +#define I2C_CR2_AUTOEND BIT(25) +#define I2C_CR2_PECBYTE BIT(26) + +/* Bit definition for I2C_OAR1 register */ +#define I2C_OAR1_OA1 GENMASK(9, 0) +#define I2C_OAR1_OA1MODE BIT(10) +#define I2C_OAR1_OA1EN BIT(15) + +/* Bit definition for I2C_OAR2 register */ +#define I2C_OAR2_OA2 GENMASK(7, 1) +#define I2C_OAR2_OA2MSK GENMASK(10, 8) +#define I2C_OAR2_OA2NOMASK 0 +#define I2C_OAR2_OA2MASK01 BIT(8) +#define I2C_OAR2_OA2MASK02 BIT(9) +#define I2C_OAR2_OA2MASK03 GENMASK(9, 8) +#define I2C_OAR2_OA2MASK04 BIT(10) +#define I2C_OAR2_OA2MASK05 (BIT(8) | BIT(10)) +#define I2C_OAR2_OA2MASK06 (BIT(9) | BIT(10)) +#define I2C_OAR2_OA2MASK07 GENMASK(10, 8) +#define I2C_OAR2_OA2EN BIT(15) + +/* Bit definition for I2C_TIMINGR register */ +#define I2C_TIMINGR_SCLL GENMASK(7, 0) +#define I2C_TIMINGR_SCLH GENMASK(15, 8) +#define I2C_TIMINGR_SDADEL GENMASK(19, 16) +#define I2C_TIMINGR_SCLDEL GENMASK(23, 20) +#define I2C_TIMINGR_PRESC GENMASK(31, 28) + +/* Bit definition for I2C_TIMEOUTR register */ +#define I2C_TIMEOUTR_TIMEOUTA GENMASK(11, 0) +#define I2C_TIMEOUTR_TIDLE BIT(12) +#define I2C_TIMEOUTR_TIMOUTEN BIT(15) +#define I2C_TIMEOUTR_TIMEOUTB GENMASK(27, 16) +#define I2C_TIMEOUTR_TEXTEN BIT(31) + +/* Bit definition for I2C_ISR register */ +#define I2C_ISR_TXE BIT(0) +#define I2C_ISR_TXIS BIT(1) +#define I2C_ISR_RXNE BIT(2) +#define I2C_ISR_ADDR BIT(3) +#define I2C_ISR_NACKF BIT(4) +#define I2C_ISR_STOPF BIT(5) +#define I2C_ISR_TC BIT(6) +#define I2C_ISR_TCR BIT(7) +#define I2C_ISR_BERR BIT(8) +#define I2C_ISR_ARLO BIT(9) +#define I2C_ISR_OVR BIT(10) +#define I2C_ISR_PECERR BIT(11) +#define I2C_ISR_TIMEOUT BIT(12) +#define I2C_ISR_ALERT BIT(13) +#define I2C_ISR_BUSY BIT(15) +#define I2C_ISR_DIR BIT(16) +#define I2C_ISR_ADDCODE GENMASK(23, 17) + +/* Bit definition for I2C_ICR register */ +#define I2C_ICR_ADDRCF BIT(3) +#define I2C_ICR_NACKCF BIT(4) +#define I2C_ICR_STOPCF BIT(5) +#define I2C_ICR_BERRCF BIT(8) +#define I2C_ICR_ARLOCF BIT(9) +#define I2C_ICR_OVRCF BIT(10) +#define I2C_ICR_PECCF BIT(11) +#define I2C_ICR_TIMOUTCF BIT(12) +#define I2C_ICR_ALERTCF BIT(13) + +enum i2c_speed_e { + I2C_SPEED_STANDARD, /* 100 kHz */ + I2C_SPEED_FAST, /* 400 kHz */ + I2C_SPEED_FAST_PLUS, /* 1 MHz */ +}; + +#define STANDARD_RATE 100000 +#define FAST_RATE 400000 +#define FAST_PLUS_RATE 1000000 + +struct stm32_i2c_init_s { + uint32_t own_address1; /* + * Specifies the first device own + * address. This parameter can be a + * 7-bit or 10-bit address. + */ + + uint32_t addressing_mode; /* + * Specifies if 7-bit or 10-bit + * addressing mode is selected. + * This parameter can be a value of + * @ref I2C_ADDRESSING_MODE. + */ + + uint32_t dual_address_mode; /* + * Specifies if dual addressing mode is + * selected. + * This parameter can be a value of @ref + * I2C_DUAL_ADDRESSING_MODE. + */ + + uint32_t own_address2; /* + * Specifies the second device own + * address if dual addressing mode is + * selected. This parameter can be a + * 7-bit address. + */ + + uint32_t own_address2_masks; /* + * Specifies the acknowledge mask + * address second device own address + * if dual addressing mode is selected + * This parameter can be a value of @ref + * I2C_OWN_ADDRESS2_MASKS. + */ + + uint32_t general_call_mode; /* + * Specifies if general call mode is + * selected. + * This parameter can be a value of @ref + * I2C_GENERAL_CALL_ADDRESSING_MODE. + */ + + uint32_t no_stretch_mode; /* + * Specifies if nostretch mode is + * selected. + * This parameter can be a value of @ref + * I2C_NOSTRETCH_MODE. + */ + + uint32_t rise_time; /* + * Specifies the SCL clock pin rising + * time in nanoseconds. + */ + + uint32_t fall_time; /* + * Specifies the SCL clock pin falling + * time in nanoseconds. + */ + + enum i2c_speed_e speed_mode; /* + * Specifies the I2C clock source + * frequency mode. + * This parameter can be a value of @ref + * i2c_speed_mode_e. + */ + + int analog_filter; /* + * Specifies if the I2C analog noise + * filter is selected. + * This parameter can be 0 (filter + * off), all other values mean filter + * on. + */ + + uint8_t digital_filter_coef; /* + * Specifies the I2C digital noise + * filter coefficient. + * This parameter can be a value + * between 0 and + * STM32_I2C_DIGITAL_FILTER_MAX. + */ +}; + +enum i2c_state_e { + I2C_STATE_RESET = 0x00U, /* Not yet initialized */ + I2C_STATE_READY = 0x20U, /* Ready for use */ + I2C_STATE_BUSY = 0x24U, /* Internal process ongoing */ + I2C_STATE_BUSY_TX = 0x21U, /* Data Transmission ongoing */ + I2C_STATE_BUSY_RX = 0x22U, /* Data Reception ongoing */ +}; + +enum i2c_mode_e { + I2C_MODE_NONE = 0x00U, /* No active communication */ + I2C_MODE_MASTER = 0x10U, /* Communication in Master Mode */ + I2C_MODE_SLAVE = 0x20U, /* Communication in Slave Mode */ + I2C_MODE_MEM = 0x40U /* Communication in Memory Mode */ + +}; + +#define I2C_ERROR_NONE 0x00000000U /* No error */ +#define I2C_ERROR_BERR 0x00000001U /* BERR error */ +#define I2C_ERROR_ARLO 0x00000002U /* ARLO error */ +#define I2C_ERROR_AF 0x00000004U /* ACKF error */ +#define I2C_ERROR_OVR 0x00000008U /* OVR error */ +#define I2C_ERROR_DMA 0x00000010U /* DMA transfer error */ +#define I2C_ERROR_TIMEOUT 0x00000020U /* Timeout error */ +#define I2C_ERROR_SIZE 0x00000040U /* Size Management error */ + +struct i2c_handle_s { + uint32_t i2c_base_addr; /* Registers base address */ + unsigned int dt_status; /* DT nsec/sec status */ + unsigned int clock; /* Clock reference */ + uint8_t lock; /* Locking object */ + enum i2c_state_e i2c_state; /* Communication state */ + enum i2c_mode_e i2c_mode; /* Communication mode */ + uint32_t i2c_err; /* Error code */ +}; + +#define I2C_ADDRESSINGMODE_7BIT 0x00000001U +#define I2C_ADDRESSINGMODE_10BIT 0x00000002U + +#define I2C_DUALADDRESS_DISABLE 0x00000000U +#define I2C_DUALADDRESS_ENABLE I2C_OAR2_OA2EN + +#define I2C_GENERALCALL_DISABLE 0x00000000U +#define I2C_GENERALCALL_ENABLE I2C_CR1_GCEN + +#define I2C_NOSTRETCH_DISABLE 0x00000000U +#define I2C_NOSTRETCH_ENABLE I2C_CR1_NOSTRETCH + +#define I2C_MEMADD_SIZE_8BIT 0x00000001U +#define I2C_MEMADD_SIZE_16BIT 0x00000002U + +#define I2C_RELOAD_MODE I2C_CR2_RELOAD +#define I2C_AUTOEND_MODE I2C_CR2_AUTOEND +#define I2C_SOFTEND_MODE 0x00000000U + +#define I2C_NO_STARTSTOP 0x00000000U +#define I2C_GENERATE_STOP (BIT(31) | I2C_CR2_STOP) +#define I2C_GENERATE_START_READ (BIT(31) | I2C_CR2_START | \ + I2C_CR2_RD_WRN) +#define I2C_GENERATE_START_WRITE (BIT(31) | I2C_CR2_START) + +#define I2C_FLAG_TXE I2C_ISR_TXE +#define I2C_FLAG_TXIS I2C_ISR_TXIS +#define I2C_FLAG_RXNE I2C_ISR_RXNE +#define I2C_FLAG_ADDR I2C_ISR_ADDR +#define I2C_FLAG_AF I2C_ISR_NACKF +#define I2C_FLAG_STOPF I2C_ISR_STOPF +#define I2C_FLAG_TC I2C_ISR_TC +#define I2C_FLAG_TCR I2C_ISR_TCR +#define I2C_FLAG_BERR I2C_ISR_BERR +#define I2C_FLAG_ARLO I2C_ISR_ARLO +#define I2C_FLAG_OVR I2C_ISR_OVR +#define I2C_FLAG_PECERR I2C_ISR_PECERR +#define I2C_FLAG_TIMEOUT I2C_ISR_TIMEOUT +#define I2C_FLAG_ALERT I2C_ISR_ALERT +#define I2C_FLAG_BUSY I2C_ISR_BUSY +#define I2C_FLAG_DIR I2C_ISR_DIR + +#define I2C_RESET_CR2 (I2C_CR2_SADD | I2C_CR2_HEAD10R | \ + I2C_CR2_NBYTES | I2C_CR2_RELOAD | \ + I2C_CR2_RD_WRN) + +#define I2C_TIMEOUT_BUSY_MS 25U + +#define I2C_ANALOGFILTER_ENABLE 0x00000000U +#define I2C_ANALOGFILTER_DISABLE I2C_CR1_ANFOFF + +/* STM32 specific defines */ +#define STM32_I2C_RISE_TIME_DEFAULT 25 /* ns */ +#define STM32_I2C_FALL_TIME_DEFAULT 10 /* ns */ +#define STM32_I2C_SPEED_DEFAULT I2C_SPEED_STANDARD +#define STM32_I2C_ANALOG_FILTER_DELAY_MIN 50 /* ns */ +#define STM32_I2C_ANALOG_FILTER_DELAY_MAX 260 /* ns */ +#define STM32_I2C_DIGITAL_FILTER_MAX 16 + +int stm32_i2c_get_setup_from_fdt(void *fdt, int node, + struct stm32_i2c_init_s *init); +int stm32_i2c_init(struct i2c_handle_s *hi2c, + struct stm32_i2c_init_s *init_data); +int stm32_i2c_mem_write(struct i2c_handle_s *hi2c, uint16_t dev_addr, + uint16_t mem_addr, uint16_t mem_add_size, + uint8_t *p_data, uint16_t size, uint32_t timeout_ms); +int stm32_i2c_mem_read(struct i2c_handle_s *hi2c, uint16_t dev_addr, + uint16_t mem_addr, uint16_t mem_add_size, + uint8_t *p_data, uint16_t size, uint32_t timeout_ms); +int stm32_i2c_master_transmit(struct i2c_handle_s *hi2c, uint16_t dev_addr, + uint8_t *p_data, uint16_t size, + uint32_t timeout_ms); +int stm32_i2c_master_receive(struct i2c_handle_s *hi2c, uint16_t dev_addr, + uint8_t *p_data, uint16_t size, + uint32_t timeout_ms); +bool stm32_i2c_is_device_ready(struct i2c_handle_s *hi2c, uint16_t dev_addr, + uint32_t trials, uint32_t timeout_ms); + +#endif /* STM32_I2C_H */ |