1 /* 2 * NVIDIA Tegra I2C controller 3 * 4 * Copyright 2010-2011 NVIDIA Corporation 5 * 6 * This software may be used and distributed according to the 7 * terms of the GNU Public License, Version 2, incorporated 8 * herein by reference. 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * Version 2 as published by the Free Software Foundation. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 22 * MA 02111-1307 USA 23 */ 24 25 #ifndef _TEGRA_I2C_H_ 26 #define _TEGRA_I2C_H_ 27 28 #include <asm/types.h> 29 30 enum { 31 I2C_TIMEOUT_USEC = 10000, /* Wait time for completion */ 32 I2C_FIFO_DEPTH = 8, /* I2C fifo depth */ 33 }; 34 35 enum i2c_transaction_flags { 36 I2C_IS_WRITE = 0x1, /* for I2C write operation */ 37 I2C_IS_10_BIT_ADDRESS = 0x2, /* for 10-bit I2C slave address */ 38 I2C_USE_REPEATED_START = 0x4, /* for repeat start */ 39 I2C_NO_ACK = 0x8, /* for slave that won't generate ACK */ 40 I2C_SOFTWARE_CONTROLLER = 0x10, /* for I2C transfer using GPIO */ 41 I2C_NO_STOP = 0x20, 42 }; 43 44 /* Contians the I2C transaction details */ 45 struct i2c_trans_info { 46 /* flags to indicate the transaction details */ 47 enum i2c_transaction_flags flags; 48 u32 address; /* I2C slave device address */ 49 u32 num_bytes; /* number of bytes to be transferred */ 50 /* 51 * Send/receive buffer. For the I2C send operation this buffer should 52 * be filled with the data to be sent to the slave device. For the I2C 53 * receive operation this buffer is filled with the data received from 54 * the slave device. 55 */ 56 u8 *buf; 57 int is_10bit_address; 58 }; 59 60 struct i2c_control { 61 u32 tx_fifo; 62 u32 rx_fifo; 63 u32 packet_status; 64 u32 fifo_control; 65 u32 fifo_status; 66 u32 int_mask; 67 u32 int_status; 68 }; 69 70 struct dvc_ctlr { 71 u32 ctrl1; /* 00: DVC_CTRL_REG1 */ 72 u32 ctrl2; /* 04: DVC_CTRL_REG2 */ 73 u32 ctrl3; /* 08: DVC_CTRL_REG3 */ 74 u32 status; /* 0C: DVC_STATUS_REG */ 75 u32 ctrl; /* 10: DVC_I2C_CTRL_REG */ 76 u32 addr_data; /* 14: DVC_I2C_ADDR_DATA_REG */ 77 u32 reserved_0[2]; /* 18: */ 78 u32 req; /* 20: DVC_REQ_REGISTER */ 79 u32 addr_data3; /* 24: DVC_I2C_ADDR_DATA_REG_3 */ 80 u32 reserved_1[6]; /* 28: */ 81 u32 cnfg; /* 40: DVC_I2C_CNFG */ 82 u32 cmd_addr0; /* 44: DVC_I2C_CMD_ADDR0 */ 83 u32 cmd_addr1; /* 48: DVC_I2C_CMD_ADDR1 */ 84 u32 cmd_data1; /* 4C: DVC_I2C_CMD_DATA1 */ 85 u32 cmd_data2; /* 50: DVC_I2C_CMD_DATA2 */ 86 u32 reserved_2[2]; /* 54: */ 87 u32 i2c_status; /* 5C: DVC_I2C_STATUS */ 88 struct i2c_control control; /* 60 ~ 78 */ 89 }; 90 91 struct i2c_ctlr { 92 u32 cnfg; /* 00: I2C_I2C_CNFG */ 93 u32 cmd_addr0; /* 04: I2C_I2C_CMD_ADDR0 */ 94 u32 cmd_addr1; /* 08: I2C_I2C_CMD_DATA1 */ 95 u32 cmd_data1; /* 0C: I2C_I2C_CMD_DATA2 */ 96 u32 cmd_data2; /* 10: DVC_I2C_CMD_DATA2 */ 97 u32 reserved_0[2]; /* 14: */ 98 u32 status; /* 1C: I2C_I2C_STATUS */ 99 u32 sl_cnfg; /* 20: I2C_I2C_SL_CNFG */ 100 u32 sl_rcvd; /* 24: I2C_I2C_SL_RCVD */ 101 u32 sl_status; /* 28: I2C_I2C_SL_STATUS */ 102 u32 sl_addr1; /* 2C: I2C_I2C_SL_ADDR1 */ 103 u32 sl_addr2; /* 30: I2C_I2C_SL_ADDR2 */ 104 u32 reserved_1[2]; /* 34: */ 105 u32 sl_delay_count; /* 3C: I2C_I2C_SL_DELAY_COUNT */ 106 u32 reserved_2[4]; /* 40: */ 107 struct i2c_control control; /* 50 ~ 68 */ 108 u32 clk_div; /* 6C: I2C_I2C_CLOCK_DIVISOR */ 109 }; 110 111 /* bit fields definitions for IO Packet Header 1 format */ 112 #define PKT_HDR1_PROTOCOL_SHIFT 4 113 #define PKT_HDR1_PROTOCOL_MASK (0xf << PKT_HDR1_PROTOCOL_SHIFT) 114 #define PKT_HDR1_CTLR_ID_SHIFT 12 115 #define PKT_HDR1_CTLR_ID_MASK (0xf << PKT_HDR1_CTLR_ID_SHIFT) 116 #define PKT_HDR1_PKT_ID_SHIFT 16 117 #define PKT_HDR1_PKT_ID_MASK (0xff << PKT_HDR1_PKT_ID_SHIFT) 118 #define PROTOCOL_TYPE_I2C 1 119 120 /* bit fields definitions for IO Packet Header 2 format */ 121 #define PKT_HDR2_PAYLOAD_SIZE_SHIFT 0 122 #define PKT_HDR2_PAYLOAD_SIZE_MASK (0xfff << PKT_HDR2_PAYLOAD_SIZE_SHIFT) 123 124 /* bit fields definitions for IO Packet Header 3 format */ 125 #define PKT_HDR3_READ_MODE_SHIFT 19 126 #define PKT_HDR3_READ_MODE_MASK (1 << PKT_HDR3_READ_MODE_SHIFT) 127 #define PKT_HDR3_SLAVE_ADDR_SHIFT 0 128 #define PKT_HDR3_SLAVE_ADDR_MASK (0x3ff << PKT_HDR3_SLAVE_ADDR_SHIFT) 129 130 #define DVC_CTRL_REG3_I2C_HW_SW_PROG_SHIFT 26 131 #define DVC_CTRL_REG3_I2C_HW_SW_PROG_MASK \ 132 (1 << DVC_CTRL_REG3_I2C_HW_SW_PROG_SHIFT) 133 134 /* I2C_CNFG */ 135 #define I2C_CNFG_NEW_MASTER_FSM_SHIFT 11 136 #define I2C_CNFG_NEW_MASTER_FSM_MASK (1 << I2C_CNFG_NEW_MASTER_FSM_SHIFT) 137 #define I2C_CNFG_PACKET_MODE_SHIFT 10 138 #define I2C_CNFG_PACKET_MODE_MASK (1 << I2C_CNFG_PACKET_MODE_SHIFT) 139 140 /* I2C_SL_CNFG */ 141 #define I2C_SL_CNFG_NEWSL_SHIFT 2 142 #define I2C_SL_CNFG_NEWSL_MASK (1 << I2C_SL_CNFG_NEWSL_SHIFT) 143 144 /* I2C_FIFO_STATUS */ 145 #define TX_FIFO_FULL_CNT_SHIFT 0 146 #define TX_FIFO_FULL_CNT_MASK (0xf << TX_FIFO_FULL_CNT_SHIFT) 147 #define TX_FIFO_EMPTY_CNT_SHIFT 4 148 #define TX_FIFO_EMPTY_CNT_MASK (0xf << TX_FIFO_EMPTY_CNT_SHIFT) 149 150 /* I2C_INTERRUPT_STATUS */ 151 #define I2C_INT_XFER_COMPLETE_SHIFT 7 152 #define I2C_INT_XFER_COMPLETE_MASK (1 << I2C_INT_XFER_COMPLETE_SHIFT) 153 #define I2C_INT_NO_ACK_SHIFT 3 154 #define I2C_INT_NO_ACK_MASK (1 << I2C_INT_NO_ACK_SHIFT) 155 #define I2C_INT_ARBITRATION_LOST_SHIFT 2 156 #define I2C_INT_ARBITRATION_LOST_MASK (1 << I2C_INT_ARBITRATION_LOST_SHIFT) 157 158 /* I2C_CLK_DIVISOR_REGISTER */ 159 #define CLK_DIV_STD_FAST_MODE 0x19 160 #define CLK_DIV_HS_MODE 1 161 #define CLK_MULT_STD_FAST_MODE 8 162 163 /** 164 * Returns the bus number of the DVC controller 165 * 166 * @return number of bus, or -1 if there is no DVC active 167 */ 168 int tegra_i2c_get_dvc_bus_num(void); 169 170 #endif /* _TEGRA_I2C_H_ */ 171