1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * (C) Copyright 2004-2010
4 * Texas Instruments, <www.ti.com>
6 #ifndef _OMAP2PLUS_I2C_H_
7 #define _OMAP2PLUS_I2C_H_
11 /* I2C Interrupt Enable Register (I2C_IE): */
12 #define I2C_IE_GC_IE (1 << 5)
13 #define I2C_IE_XRDY_IE (1 << 4) /* Transmit data ready interrupt enable */
14 #define I2C_IE_RRDY_IE (1 << 3) /* Receive data ready interrupt enable */
15 #define I2C_IE_ARDY_IE (1 << 2) /* Register access ready interrupt enable */
16 #define I2C_IE_NACK_IE (1 << 1) /* No acknowledgment interrupt enable */
17 #define I2C_IE_AL_IE (1 << 0) /* Arbitration lost interrupt enable */
19 /* I2C Status Register (I2C_STAT): */
21 #define I2C_STAT_SBD (1 << 15) /* Single byte data */
22 #define I2C_STAT_BB (1 << 12) /* Bus busy */
23 #define I2C_STAT_ROVR (1 << 11) /* Receive overrun */
24 #define I2C_STAT_XUDF (1 << 10) /* Transmit underflow */
25 #define I2C_STAT_AAS (1 << 9) /* Address as slave */
26 #define I2C_STAT_GC (1 << 5)
27 #define I2C_STAT_XRDY (1 << 4) /* Transmit data ready */
28 #define I2C_STAT_RRDY (1 << 3) /* Receive data ready */
29 #define I2C_STAT_ARDY (1 << 2) /* Register access ready */
30 #define I2C_STAT_NACK (1 << 1) /* No acknowledgment interrupt enable */
31 #define I2C_STAT_AL (1 << 0) /* Arbitration lost interrupt enable */
33 /* I2C Interrupt Code Register (I2C_INTCODE): */
35 #define I2C_INTCODE_MASK 7
36 #define I2C_INTCODE_NONE 0
37 #define I2C_INTCODE_AL 1 /* Arbitration lost */
38 #define I2C_INTCODE_NAK 2 /* No acknowledgement/general call */
39 #define I2C_INTCODE_ARDY 3 /* Register access ready */
40 #define I2C_INTCODE_RRDY 4 /* Rcv data ready */
41 #define I2C_INTCODE_XRDY 5 /* Xmit data ready */
43 /* I2C Buffer Configuration Register (I2C_BUF): */
45 #define I2C_BUF_RDMA_EN (1 << 15) /* Receive DMA channel enable */
46 #define I2C_BUF_XDMA_EN (1 << 7) /* Transmit DMA channel enable */
48 /* I2C Configuration Register (I2C_CON): */
50 #define I2C_CON_EN (1 << 15) /* I2C module enable */
51 #define I2C_CON_BE (1 << 14) /* Big endian mode */
52 #define I2C_CON_STB (1 << 11) /* Start byte mode (master mode only) */
53 #define I2C_CON_MST (1 << 10) /* Master/slave mode */
54 #define I2C_CON_TRX (1 << 9) /* Transmitter/receiver mode */
55 /* (master mode only) */
56 #define I2C_CON_XA (1 << 8) /* Expand address */
57 #define I2C_CON_STP (1 << 1) /* Stop condition (master mode only) */
58 #define I2C_CON_STT (1 << 0) /* Start condition (master mode only) */
60 /* I2C System Test Register (I2C_SYSTEST): */
62 #define I2C_SYSTEST_ST_EN (1 << 15) /* System test enable */
63 #define I2C_SYSTEST_FREE (1 << 14) /* Free running mode, on brkpoint) */
64 #define I2C_SYSTEST_TMODE_MASK (3 << 12) /* Test mode select */
65 #define I2C_SYSTEST_TMODE_SHIFT (12) /* Test mode select */
66 #define I2C_SYSTEST_SCL_I (1 << 3) /* SCL line sense input value */
67 #define I2C_SYSTEST_SCL_O (1 << 2) /* SCL line drive output value */
68 #define I2C_SYSTEST_SDA_I (1 << 1) /* SDA line sense input value */
69 #define I2C_SYSTEST_SDA_O (1 << 0) /* SDA line drive output value */
71 /* I2C System Status Register (I2C_SYSS): */
73 #define I2C_SYSS_RDONE (1 << 0) /* Internel reset monitoring */
75 #define I2C_SCLL_SCLL 0
76 #define I2C_SCLL_SCLL_M 0xFF
77 #define I2C_SCLL_HSSCLL 8
78 #define I2C_SCLH_HSSCLL_M 0xFF
79 #define I2C_SCLH_SCLH 0
80 #define I2C_SCLH_SCLH_M 0xFF
81 #define I2C_SCLH_HSSCLH 8
82 #define I2C_SCLH_HSSCLH_M 0xFF
84 #define OMAP_I2C_STANDARD 100000
85 #define OMAP_I2C_FAST_MODE 400000
86 #define OMAP_I2C_HIGH_SPEED 3400000
88 #define SYSTEM_CLOCK_12 12000000
89 #define SYSTEM_CLOCK_13 13000000
90 #define SYSTEM_CLOCK_192 19200000
91 #define SYSTEM_CLOCK_96 96000000
93 /* Use the reference value of 96MHz if not explicitly set by the board */
95 #define I2C_IP_CLK SYSTEM_CLOCK_96
99 * The reference minimum clock for high speed is 19.2MHz.
100 * The linux 2.6.30 kernel uses this value.
101 * The reference minimum clock for fast mode is 9.6MHz
102 * The reference minimum clock for standard mode is 4MHz
103 * In TRM, the value of 12MHz is used.
105 #ifndef I2C_INTERNAL_SAMPLING_CLK
106 #define I2C_INTERNAL_SAMPLING_CLK 19200000
110 * The equation for the low and high time is
111 * tlow = scll + scll_trim = (sampling clock * tlow_duty) / speed
112 * thigh = sclh + sclh_trim = (sampling clock * (1 - tlow_duty)) / speed
114 * If the duty cycle is 50%
116 * tlow = scll + scll_trim = sampling clock / (2 * speed)
117 * thigh = sclh + sclh_trim = sampling clock / (2 * speed)
123 * The linux 4.9 kernel uses
127 * These are the trim values for standard and fast speed
129 #ifndef I2C_FASTSPEED_SCLL_TRIM
130 #define I2C_FASTSPEED_SCLL_TRIM 7
132 #ifndef I2C_FASTSPEED_SCLH_TRIM
133 #define I2C_FASTSPEED_SCLH_TRIM 5
136 /* These are the trim values for high speed */
137 #ifndef I2C_HIGHSPEED_PHASE_ONE_SCLL_TRIM
138 #define I2C_HIGHSPEED_PHASE_ONE_SCLL_TRIM I2C_FASTSPEED_SCLL_TRIM
140 #ifndef I2C_HIGHSPEED_PHASE_ONE_SCLH_TRIM
141 #define I2C_HIGHSPEED_PHASE_ONE_SCLH_TRIM I2C_FASTSPEED_SCLH_TRIM
143 #ifndef I2C_HIGHSPEED_PHASE_TWO_SCLL_TRIM
144 #define I2C_HIGHSPEED_PHASE_TWO_SCLL_TRIM I2C_FASTSPEED_SCLL_TRIM
146 #ifndef I2C_HIGHSPEED_PHASE_TWO_SCLH_TRIM
147 #define I2C_HIGHSPEED_PHASE_TWO_SCLH_TRIM I2C_FASTSPEED_SCLH_TRIM
150 #define I2C_PSC_MAX 0x0f
151 #define I2C_PSC_MIN 0x00
153 #endif /* _OMAP24XX_I2C_H_ */