1 #ifndef _AT91_I2C_H 2 #define _AT91_I2C_H 3 4 #define TWI_CR_START BIT(0) /* Send a Start Condition */ 5 #define TWI_CR_MSEN BIT(2) /* Master Transfer Enable */ 6 #define TWI_CR_STOP BIT(1) /* Send a Stop Condition */ 7 #define TWI_CR_SVDIS BIT(5) /* Slave Transfer Disable */ 8 #define TWI_CR_SWRST BIT(7) /* Software Reset */ 9 #define TWI_CR_ACMEN BIT(16) /* Alternative Command Mode Enable */ 10 #define TWI_CR_ACMDIS BIT(17) /* Alternative Command Mode Disable */ 11 #define TWI_CR_LOCKCLR BIT(26) /* Lock Clear */ 12 13 #define TWI_MMR_MREAD BIT(12) /* Master Read Direction */ 14 #define TWI_MMR_IADRSZ_1 BIT(8) /* Internal Device Address Size */ 15 16 #define TWI_SR_TXCOMP BIT(0) /* Transmission Complete */ 17 #define TWI_SR_RXRDY BIT(1) /* Receive Holding Register Ready */ 18 #define TWI_SR_TXRDY BIT(2) /* Transmit Holding Register Ready */ 19 #define TWI_SR_OVRE BIT(6) /* Overrun Error */ 20 #define TWI_SR_UNRE BIT(7) /* Underrun Error */ 21 #define TWI_SR_NACK BIT(8) /* Not Acknowledged */ 22 #define TWI_SR_LOCK BIT(23) /* TWI Lock due to Frame Errors */ 23 24 #define TWI_ACR_DATAL(len) ((len) & 0xff) 25 #define TWI_ACR_DIR_READ BIT(8) 26 27 #define TWI_CWGR_HOLD_MAX 0x1f 28 #define TWI_CWGR_HOLD(x) (((x) & TWI_CWGR_HOLD_MAX) << 24) 29 30 struct at91_i2c_regs { 31 u32 cr; 32 u32 mmr; 33 u32 smr; 34 u32 iadr; 35 u32 cwgr; 36 u32 rev_0[3]; 37 u32 sr; 38 u32 ier; 39 u32 idr; 40 u32 imr; 41 u32 rhr; 42 u32 thr; 43 u32 smbtr; 44 u32 rev_1; 45 u32 acr; 46 u32 filtr; 47 u32 rev_2; 48 u32 swmr; 49 u32 fmr; 50 u32 flr; 51 u32 rev_3; 52 u32 fsr; 53 u32 fier; 54 u32 fidr; 55 u32 fimr; 56 u32 rev_4[29]; 57 u32 wpmr; 58 u32 wpsr; 59 u32 rev_5[6]; 60 }; 61 62 struct at91_i2c_pdata { 63 unsigned clk_max_div; 64 unsigned clk_offset; 65 }; 66 67 struct at91_i2c_bus { 68 struct at91_i2c_regs *regs; 69 u32 status; 70 ulong bus_clk_rate; 71 u32 clock_frequency; 72 u32 speed; 73 u32 cwgr_val; 74 const struct at91_i2c_pdata *pdata; 75 }; 76 77 #endif 78
