8800e0fa20
Add i2c driver. Signed-off-by: Songjun Wu <songjun.wu@atmel.com> Reviewed-by: Heiko Schocher <hs@denx.de> Acked-by: Heiko Schocher <hs@denx.de>
78 lines
1.8 KiB
C
78 lines
1.8 KiB
C
#ifndef _AT91_I2C_H
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#define _AT91_I2C_H
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#define TWI_CR_START BIT(0) /* Send a Start Condition */
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#define TWI_CR_MSEN BIT(2) /* Master Transfer Enable */
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#define TWI_CR_STOP BIT(1) /* Send a Stop Condition */
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#define TWI_CR_SVDIS BIT(5) /* Slave Transfer Disable */
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#define TWI_CR_SWRST BIT(7) /* Software Reset */
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#define TWI_CR_ACMEN BIT(16) /* Alternative Command Mode Enable */
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#define TWI_CR_ACMDIS BIT(17) /* Alternative Command Mode Disable */
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#define TWI_CR_LOCKCLR BIT(26) /* Lock Clear */
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#define TWI_MMR_MREAD BIT(12) /* Master Read Direction */
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#define TWI_MMR_IADRSZ_1 BIT(8) /* Internal Device Address Size */
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#define TWI_SR_TXCOMP BIT(0) /* Transmission Complete */
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#define TWI_SR_RXRDY BIT(1) /* Receive Holding Register Ready */
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#define TWI_SR_TXRDY BIT(2) /* Transmit Holding Register Ready */
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#define TWI_SR_OVRE BIT(6) /* Overrun Error */
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#define TWI_SR_UNRE BIT(7) /* Underrun Error */
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#define TWI_SR_NACK BIT(8) /* Not Acknowledged */
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#define TWI_SR_LOCK BIT(23) /* TWI Lock due to Frame Errors */
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#define TWI_ACR_DATAL(len) ((len) & 0xff)
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#define TWI_ACR_DIR_READ BIT(8)
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#define TWI_CWGR_HOLD_MAX 0x1f
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#define TWI_CWGR_HOLD(x) (((x) & TWI_CWGR_HOLD_MAX) << 24)
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struct at91_i2c_regs {
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u32 cr;
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u32 mmr;
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u32 smr;
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u32 iadr;
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u32 cwgr;
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u32 rev_0[3];
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u32 sr;
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u32 ier;
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u32 idr;
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u32 imr;
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u32 rhr;
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u32 thr;
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u32 smbtr;
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u32 rev_1;
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u32 acr;
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u32 filtr;
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u32 rev_2;
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u32 swmr;
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u32 fmr;
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u32 flr;
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u32 rev_3;
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u32 fsr;
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u32 fier;
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u32 fidr;
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u32 fimr;
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u32 rev_4[29];
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u32 wpmr;
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u32 wpsr;
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u32 rev_5[6];
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};
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struct at91_i2c_pdata {
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unsigned clk_max_div;
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unsigned clk_offset;
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};
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struct at91_i2c_bus {
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struct at91_i2c_regs *regs;
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u32 status;
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ulong bus_clk_rate;
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u32 clock_frequency;
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u32 speed;
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u32 cwgr_val;
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const struct at91_i2c_pdata *pdata;
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};
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#endif
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