1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * Copyright (C) 2012-2020  ASPEED Technology Inc.
4  * Copyright 2016 IBM Corporation
5  * Copyright 2017 Google, Inc.
6  */
7 #ifndef __AST_I2C_H_
8 #define __AST_I2C_H_
9 
10 struct ast_i2c_regs {
11 	u32 fcr;
12 	u32 cactcr1;
13 	u32 cactcr2;
14 	u32 icr;
15 	u32 isr;
16 	u32 csr;
17 	u32 sdar;
18 	u32 pbcr;
19 	u32 trbbr;
20 #ifdef CONFIG_ASPEED_AST2500
21 	u32 dma_mbar;
22 	u32 dma_tlr;
23 #endif
24 };
25 
26 /* Device Register Definition */
27 /* 0x00 : I2CD Function Control Register  */
28 #define I2CD_BUFF_SEL_MASK				(0x7 << 20)
29 #define I2CD_BUFF_SEL(x)				(x << 20)
30 #define I2CD_M_SDA_LOCK_EN			(0x1 << 16)
31 #define I2CD_MULTI_MASTER_DIS			(0x1 << 15)
32 #define I2CD_M_SCL_DRIVE_EN		(0x1 << 14)
33 #define I2CD_MSB_STS					(0x1 << 9)
34 #define I2CD_SDA_DRIVE_1T_EN			(0x1 << 8)
35 #define I2CD_M_SDA_DRIVE_1T_EN		(0x1 << 7)
36 #define I2CD_M_HIGH_SPEED_EN		(0x1 << 6)
37 #define I2CD_DEF_ADDR_EN				(0x1 << 5)
38 #define I2CD_DEF_ALERT_EN				(0x1 << 4)
39 #define I2CD_DEF_ARP_EN					(0x1 << 3)
40 #define I2CD_DEF_GCALL_EN				(0x1 << 2)
41 #define I2CD_SLAVE_EN					(0x1 << 1)
42 #define I2CD_MASTER_EN					(0x1)
43 
44 /* 0x04 : I2CD Clock and AC Timing Control Register #1 */
45 /* Base register value. These bits are always set by the driver. */
46 #define I2CD_CACTC_BASE			0xfff00300
47 #define I2CD_TCKHIGH_SHIFT			16
48 #define I2CD_TCKLOW_SHIFT			12
49 #define I2CD_THDDAT_SHIFT			10
50 #define I2CD_TO_DIV_SHIFT			8
51 #define I2CD_BASE_DIV_SHIFT			0
52 
53 /* 0x08 : I2CD Clock and AC Timing Control Register #2 */
54 #define I2CD_tTIMEOUT					1
55 #define I2CD_NO_TIMEOUT_CTRL			0
56 
57 /* 0x0c : I2CD Interrupt Control Register &
58  * 0x10 : I2CD Interrupt Status Register
59  *
60  * These share bit definitions, so use the same values for the enable &
61  * status bits.
62  */
63 #define I2CD_INTR_SDA_DL_TIMEOUT			(0x1 << 14)
64 #define I2CD_INTR_BUS_RECOVER_DONE			(0x1 << 13)
65 #define I2CD_INTR_SMBUS_ALERT			(0x1 << 12)
66 #define I2CD_INTR_SMBUS_ARP_ADDR			(0x1 << 11)
67 #define I2CD_INTR_SMBUS_DEV_ALERT_ADDR		(0x1 << 10)
68 #define I2CD_INTR_SMBUS_DEF_ADDR			(0x1 << 9)
69 #define I2CD_INTR_GCALL_ADDR			(0x1 << 8)
70 #define I2CD_INTR_SLAVE_MATCH			(0x1 << 7)
71 #define I2CD_INTR_SCL_TIMEOUT			(0x1 << 6)
72 #define I2CD_INTR_ABNORMAL				(0x1 << 5)
73 #define I2CD_INTR_NORMAL_STOP			(0x1 << 4)
74 #define I2CD_INTR_ARBIT_LOSS			(0x1 << 3)
75 #define I2CD_INTR_RX_DONE				(0x1 << 2)
76 #define I2CD_INTR_TX_NAK				(0x1 << 1)
77 #define I2CD_INTR_TX_ACK				(0x1 << 0)
78 
79 /* 0x14 : I2CD Command/Status Register   */
80 #define I2CD_SDA_OE					(0x1 << 28)
81 #define I2CD_SDA_O					(0x1 << 27)
82 #define I2CD_SCL_OE					(0x1 << 26)
83 #define I2CD_SCL_O					(0x1 << 25)
84 #define I2CD_TX_TIMING				(0x1 << 24)
85 #define I2CD_TX_STATUS				(0x1 << 23)
86 
87 /* Tx State Machine */
88 #define I2CD_IDLE					0x0
89 #define I2CD_MACTIVE				0x8
90 #define I2CD_MSTART					0x9
91 #define I2CD_MSTARTR				0xa
92 #define I2CD_MSTOP					0xb
93 #define I2CD_MTXD					0xc
94 #define I2CD_MRXACK					0xd
95 #define I2CD_MRXD					0xe
96 #define I2CD_MTXACK				0xf
97 #define I2CD_SWAIT					0x1
98 #define I2CD_SRXD					0x4
99 #define I2CD_STXACK				0x5
100 #define I2CD_STXD					0x6
101 #define I2CD_SRXACK				0x7
102 #define I2CD_RECOVER				0x3
103 
104 #define I2CD_SCL_LINE_STS				(0x1 << 18)
105 #define I2CD_SDA_LINE_STS				(0x1 << 17)
106 #define I2CD_BUS_BUSY_STS				(0x1 << 16)
107 #define I2CD_SDA_OE_OUT_DIR				(0x1 << 15)
108 #define I2CD_SDA_O_OUT_DIR				(0x1 << 14)
109 #define I2CD_SCL_OE_OUT_DIR				(0x1 << 13)
110 #define I2CD_SCL_O_OUT_DIR				(0x1 << 12)
111 #define I2CD_BUS_RECOVER_CMD			(0x1 << 11)
112 #define I2CD_S_ALT_EN				(0x1 << 10)
113 #define I2CD_RX_DMA_ENABLE				(0x1 << 9)
114 #define I2CD_TX_DMA_ENABLE				(0x1 << 8)
115 
116 /* Command Bit */
117 #define I2CD_RX_BUFF_ENABLE				(0x1 << 7)
118 #define I2CD_TX_BUFF_ENABLE				(0x1 << 6)
119 #define I2CD_M_STOP_CMD					(0x1 << 5)
120 #define I2CD_M_S_RX_CMD_LAST			(0x1 << 4)
121 #define I2CD_M_RX_CMD					(0x1 << 3)
122 #define I2CD_S_TX_CMD					(0x1 << 2)
123 #define I2CD_M_TX_CMD					(0x1 << 1)
124 #define I2CD_M_START_CMD				0x1
125 
126 #define I2CD_RX_DATA_SHIFT			8
127 #define I2CD_RX_DATA_MASK			(0xff << I2CD_RX_DATA_SHIFT)
128 
129 #endif				/* __AST_I2C_H_ */
130