2 * Copyright (c) 2003-2012 Broadcom Corporation
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in
13 * the documentation and/or other materials provided with the
16 * THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
23 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
25 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
26 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 #ifndef __OPENCORE_I2C_H__
32 #define __OPENCORE_I2C_H__
34 /* I2C specific registers */
35 #define OC_I2C_PRESCALE_LO_REG 0x00
36 #define OC_I2C_PRESCALE_HI_REG 0x01
37 #define OC_I2C_CTRL_REG 0x02
38 #define OC_I2C_TRANSMIT_REG 0x03 /* tx and rx - same reg */
39 #define OC_I2C_RECV_REG 0x03 /* tx and rx - same reg */
40 #define OC_I2C_DATA_REG 0x03 /* tx and rx - same reg */
41 #define OC_I2C_CMD_REG 0x04 /* cmd and status - same reg */
42 #define OC_I2C_STATUS_REG 0x04 /* cmd and status - same reg */
44 #define XLP_I2C_CLKFREQ 133333333 /* XLP 133 MHz IO clock */
45 #define XLP_I2C_FREQ 100000 /* default 100kHz */
46 #define I2C_TIMEOUT 500000
49 * These defines pertain to the OpenCores
50 * I2C Master Host Controller used in XLP
53 #define OC_PRESCALER_LO 0
54 #define OC_PRESCALER_HI 1
57 #define OC_CONTROL_EN 0x80
58 #define OC_CONTROL_IEN 0x40
60 #define OC_DATA 3 /* Data TX & RX Reg */
63 #define OC_COMMAND_START 0x90
64 #define OC_COMMAND_STOP 0x40
65 #define OC_COMMAND_READ 0x20
66 #define OC_COMMAND_WRITE 0x10
67 #define OC_COMMAND_RDACK 0x20
68 #define OC_COMMAND_RDNACK 0x28
69 #define OC_COMMAND_IACK 0x01 /* Not used */
71 #define OC_STATUS 4 /* Same as 'command' */
72 #define OC_STATUS_NACK 0x80 /* Did not get an ACK */
73 #define OC_STATUS_BUSY 0x40
74 #define OC_STATUS_AL 0x20 /* Arbitration Lost */
75 #define OC_STATUS_TIP 0x02 /* Transfer in Progress */
76 #define OC_STATUS_IF 0x01 /* Intr. Pending Flag */