diff options
| author | Juergen Fitschen | 2019-02-22 10:25:22 +0100 |
|---|---|---|
| committer | Wolfram Sang | 2019-03-24 22:41:51 +0100 |
| commit | 9d3ca54b550ca070d3e3ed0c137ed1655fcf2772 (patch) | |
| tree | 5b02bd1a480a674ff5a826d0931d85ecdc0d8a98 /drivers/i2c/busses/i2c-at91.h | |
| parent | i2c: at91: split driver into core and master file (diff) | |
| download | kernel-qcow2-linux-9d3ca54b550ca070d3e3ed0c137ed1655fcf2772.tar.gz kernel-qcow2-linux-9d3ca54b550ca070d3e3ed0c137ed1655fcf2772.tar.xz kernel-qcow2-linux-9d3ca54b550ca070d3e3ed0c137ed1655fcf2772.zip | |
i2c: at91: added slave mode support
Slave mode driver is based on the concept of i2c-designware driver.
Signed-off-by: Juergen Fitschen <me@jue.yt>
[ludovic.desroches@microchip.com: rework Kconfig and replace IS_ENABLED
by defined]
Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c/busses/i2c-at91.h')
| -rw-r--r-- | drivers/i2c/busses/i2c-at91.h | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/drivers/i2c/busses/i2c-at91.h b/drivers/i2c/busses/i2c-at91.h index 636447498b41..be0e7afda529 100644 --- a/drivers/i2c/busses/i2c-at91.h +++ b/drivers/i2c/busses/i2c-at91.h @@ -49,6 +49,10 @@ #define AT91_TWI_IADRSZ_1 0x0100 /* Internal Device Address Size */ #define AT91_TWI_MREAD BIT(12) /* Master Read Direction */ +#define AT91_TWI_SMR 0x0008 /* Slave Mode Register */ +#define AT91_TWI_SMR_SADR_MAX 0x007f +#define AT91_TWI_SMR_SADR(x) (((x) & AT91_TWI_SMR_SADR_MAX) << 16) + #define AT91_TWI_IADR 0x000c /* Internal Address Register */ #define AT91_TWI_CWGR 0x0010 /* Clock Waveform Generator Reg */ @@ -59,13 +63,17 @@ #define AT91_TWI_TXCOMP BIT(0) /* Transmission Complete */ #define AT91_TWI_RXRDY BIT(1) /* Receive Holding Register Ready */ #define AT91_TWI_TXRDY BIT(2) /* Transmit Holding Register Ready */ +#define AT91_TWI_SVREAD BIT(3) /* Slave Read */ +#define AT91_TWI_SVACC BIT(4) /* Slave Access */ #define AT91_TWI_OVRE BIT(6) /* Overrun Error */ #define AT91_TWI_UNRE BIT(7) /* Underrun Error */ #define AT91_TWI_NACK BIT(8) /* Not Acknowledged */ +#define AT91_TWI_EOSACC BIT(11) /* End Of Slave Access */ #define AT91_TWI_LOCK BIT(23) /* TWI Lock due to Frame Errors */ #define AT91_TWI_INT_MASK \ - (AT91_TWI_TXCOMP | AT91_TWI_RXRDY | AT91_TWI_TXRDY | AT91_TWI_NACK) + (AT91_TWI_TXCOMP | AT91_TWI_RXRDY | AT91_TWI_TXRDY | AT91_TWI_NACK \ + | AT91_TWI_SVACC | AT91_TWI_EOSACC) #define AT91_TWI_IER 0x0024 /* Interrupt Enable Register */ #define AT91_TWI_IDR 0x0028 /* Interrupt Disable Register */ @@ -133,6 +141,11 @@ struct at91_twi_dev { bool recv_len_abort; u32 fifo_size; struct at91_twi_dma dma; + bool slave_detected; +#ifdef CONFIG_I2C_AT91_SLAVE_EXPERIMENTAL + unsigned smr; + struct i2c_client *slave; +#endif }; unsigned at91_twi_read(struct at91_twi_dev *dev, unsigned reg); @@ -145,3 +158,18 @@ void at91_init_twi_bus(struct at91_twi_dev *dev); void at91_init_twi_bus_master(struct at91_twi_dev *dev); int at91_twi_probe_master(struct platform_device *pdev, u32 phy_addr, struct at91_twi_dev *dev); + +#ifdef CONFIG_I2C_AT91_SLAVE_EXPERIMENTAL +void at91_init_twi_bus_slave(struct at91_twi_dev *dev); +int at91_twi_probe_slave(struct platform_device *pdev, u32 phy_addr, + struct at91_twi_dev *dev); + +#else +static inline void at91_init_twi_bus_slave(struct at91_twi_dev *dev) {} +static inline int at91_twi_probe_slave(struct platform_device *pdev, + u32 phy_addr, struct at91_twi_dev *dev) +{ + return -EINVAL; +} + +#endif |