i2c: atmel: add i2c driver
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>
diff --git a/drivers/i2c/at91_i2c.h b/drivers/i2c/at91_i2c.h
new file mode 100644
index 0000000..87f02bf
--- /dev/null
+++ b/drivers/i2c/at91_i2c.h
@@ -0,0 +1,77 @@
+#ifndef _AT91_I2C_H
+#define _AT91_I2C_H
+
+#define TWI_CR_START BIT(0) /* Send a Start Condition */
+#define TWI_CR_MSEN BIT(2) /* Master Transfer Enable */
+#define TWI_CR_STOP BIT(1) /* Send a Stop Condition */
+#define TWI_CR_SVDIS BIT(5) /* Slave Transfer Disable */
+#define TWI_CR_SWRST BIT(7) /* Software Reset */
+#define TWI_CR_ACMEN BIT(16) /* Alternative Command Mode Enable */
+#define TWI_CR_ACMDIS BIT(17) /* Alternative Command Mode Disable */
+#define TWI_CR_LOCKCLR BIT(26) /* Lock Clear */
+
+#define TWI_MMR_MREAD BIT(12) /* Master Read Direction */
+#define TWI_MMR_IADRSZ_1 BIT(8) /* Internal Device Address Size */
+
+#define TWI_SR_TXCOMP BIT(0) /* Transmission Complete */
+#define TWI_SR_RXRDY BIT(1) /* Receive Holding Register Ready */
+#define TWI_SR_TXRDY BIT(2) /* Transmit Holding Register Ready */
+#define TWI_SR_OVRE BIT(6) /* Overrun Error */
+#define TWI_SR_UNRE BIT(7) /* Underrun Error */
+#define TWI_SR_NACK BIT(8) /* Not Acknowledged */
+#define TWI_SR_LOCK BIT(23) /* TWI Lock due to Frame Errors */
+
+#define TWI_ACR_DATAL(len) ((len) & 0xff)
+#define TWI_ACR_DIR_READ BIT(8)
+
+#define TWI_CWGR_HOLD_MAX 0x1f
+#define TWI_CWGR_HOLD(x) (((x) & TWI_CWGR_HOLD_MAX) << 24)
+
+struct at91_i2c_regs {
+ u32 cr;
+ u32 mmr;
+ u32 smr;
+ u32 iadr;
+ u32 cwgr;
+ u32 rev_0[3];
+ u32 sr;
+ u32 ier;
+ u32 idr;
+ u32 imr;
+ u32 rhr;
+ u32 thr;
+ u32 smbtr;
+ u32 rev_1;
+ u32 acr;
+ u32 filtr;
+ u32 rev_2;
+ u32 swmr;
+ u32 fmr;
+ u32 flr;
+ u32 rev_3;
+ u32 fsr;
+ u32 fier;
+ u32 fidr;
+ u32 fimr;
+ u32 rev_4[29];
+ u32 wpmr;
+ u32 wpsr;
+ u32 rev_5[6];
+};
+
+struct at91_i2c_pdata {
+ unsigned clk_max_div;
+ unsigned clk_offset;
+};
+
+struct at91_i2c_bus {
+ struct at91_i2c_regs *regs;
+ u32 status;
+ ulong bus_clk_rate;
+ u32 clock_frequency;
+ u32 speed;
+ u32 cwgr_val;
+ const struct at91_i2c_pdata *pdata;
+};
+
+#endif