aboutsummaryrefslogtreecommitdiff
path: root/drivers/i2c/omap24xx_i2c.h
blob: 1f38c232d16461c8f077c40573f637a8957ab2b3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
/*
 * (C) Copyright 2004-2010
 * Texas Instruments, <www.ti.com>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */
#ifndef _OMAP2PLUS_I2C_H_
#define _OMAP2PLUS_I2C_H_

/* I2C masks */

/* I2C Interrupt Enable Register (I2C_IE): */
#define I2C_IE_GC_IE	(1 << 5)
#define I2C_IE_XRDY_IE	(1 << 4) /* Transmit data ready interrupt enable */
#define I2C_IE_RRDY_IE	(1 << 3) /* Receive data ready interrupt enable */
#define I2C_IE_ARDY_IE	(1 << 2) /* Register access ready interrupt enable */
#define I2C_IE_NACK_IE	(1 << 1) /* No acknowledgment interrupt enable */
#define I2C_IE_AL_IE	(1 << 0) /* Arbitration lost interrupt enable */

/* I2C Status Register (I2C_STAT): */

#define I2C_STAT_SBD	(1 << 15) /* Single byte data */
#define I2C_STAT_BB	(1 << 12) /* Bus busy */
#define I2C_STAT_ROVR	(1 << 11) /* Receive overrun */
#define I2C_STAT_XUDF	(1 << 10) /* Transmit underflow */
#define I2C_STAT_AAS	(1 << 9)  /* Address as slave */
#define I2C_STAT_GC	(1 << 5)
#define I2C_STAT_XRDY	(1 << 4)  /* Transmit data ready */
#define I2C_STAT_RRDY	(1 << 3)  /* Receive data ready */
#define I2C_STAT_ARDY	(1 << 2)  /* Register access ready */
#define I2C_STAT_NACK	(1 << 1)  /* No acknowledgment interrupt enable */
#define I2C_STAT_AL	(1 << 0)  /* Arbitration lost interrupt enable */

/* I2C Interrupt Code Register (I2C_INTCODE): */

#define I2C_INTCODE_MASK	7
#define I2C_INTCODE_NONE	0
#define I2C_INTCODE_AL		1	/* Arbitration lost */
#define I2C_INTCODE_NAK		2	/* No acknowledgement/general call */
#define I2C_INTCODE_ARDY	3	/* Register access ready */
#define I2C_INTCODE_RRDY	4	/* Rcv data ready */
#define I2C_INTCODE_XRDY	5	/* Xmit data ready */

/* I2C Buffer Configuration Register (I2C_BUF): */

#define I2C_BUF_RDMA_EN		(1 << 15) /* Receive DMA channel enable */
#define I2C_BUF_XDMA_EN		(1 << 7)  /* Transmit DMA channel enable */

/* I2C Configuration Register (I2C_CON): */

#define I2C_CON_EN	(1 << 15)  /* I2C module enable */
#define I2C_CON_BE	(1 << 14)  /* Big endian mode */
#define I2C_CON_STB	(1 << 11)  /* Start byte mode (master mode only) */
#define I2C_CON_MST	(1 << 10)  /* Master/slave mode */
#define I2C_CON_TRX	(1 << 9)   /* Transmitter/receiver mode */
				   /* (master mode only) */
#define I2C_CON_XA	(1 << 8)   /* Expand address */
#define I2C_CON_STP	(1 << 1)   /* Stop condition (master mode only) */
#define I2C_CON_STT	(1 << 0)   /* Start condition (master mode only) */

/* I2C System Test Register (I2C_SYSTEST): */

#define I2C_SYSTEST_ST_EN	(1 << 15) /* System test enable */
#define I2C_SYSTEST_FREE	(1 << 14) /* Free running mode, on brkpoint) */
#define I2C_SYSTEST_TMODE_MASK	(3 << 12) /* Test mode select */
#define I2C_SYSTEST_TMODE_SHIFT	(12)	  /* Test mode select */
#define I2C_SYSTEST_SCL_I	(1 << 3)  /* SCL line sense input value */
#define I2C_SYSTEST_SCL_O	(1 << 2)  /* SCL line drive output value */
#define I2C_SYSTEST_SDA_I	(1 << 1)  /* SDA line sense input value */
#define I2C_SYSTEST_SDA_O	(1 << 0)  /* SDA line drive output value */

/* I2C System Status Register (I2C_SYSS): */

#define I2C_SYSS_RDONE          (1 << 0)  /* Internel reset monitoring */

#define I2C_SCLL_SCLL		0
#define I2C_SCLL_SCLL_M		0xFF
#define I2C_SCLL_HSSCLL		8
#define I2C_SCLH_HSSCLL_M	0xFF
#define I2C_SCLH_SCLH		0
#define I2C_SCLH_SCLH_M		0xFF
#define I2C_SCLH_HSSCLH		8
#define I2C_SCLH_HSSCLH_M	0xFF

#define OMAP_I2C_STANDARD	100000
#define OMAP_I2C_FAST_MODE	400000
#define OMAP_I2C_HIGH_SPEED	3400000

#define SYSTEM_CLOCK_12		12000000
#define SYSTEM_CLOCK_13		13000000
#define SYSTEM_CLOCK_192	19200000
#define SYSTEM_CLOCK_96		96000000

/* Use the reference value of 96MHz if not explicitly set by the board */
#ifndef I2C_IP_CLK
#define I2C_IP_CLK		SYSTEM_CLOCK_96
#endif

/*
 * The reference minimum clock for high speed is 19.2MHz.
 * The linux 2.6.30 kernel uses this value.
 * The reference minimum clock for fast mode is 9.6MHz
 * The reference minimum clock for standard mode is 4MHz
 * In TRM, the value of 12MHz is used.
 */
#ifndef I2C_INTERNAL_SAMPLING_CLK
#define I2C_INTERNAL_SAMPLING_CLK	19200000
#endif

/*
 * The equation for the low and high time is
 * tlow = scll + scll_trim = (sampling clock * tlow_duty) / speed
 * thigh = sclh + sclh_trim = (sampling clock * (1 - tlow_duty)) / speed
 *
 * If the duty cycle is 50%
 *
 * tlow = scll + scll_trim = sampling clock / (2 * speed)
 * thigh = sclh + sclh_trim = sampling clock / (2 * speed)
 *
 * In TRM
 * scll_trim = 7
 * sclh_trim = 5
 *
 * The linux 2.6.30 kernel uses
 * scll_trim = 6
 * sclh_trim = 6
 *
 * These are the trim values for standard and fast speed
 */
#ifndef I2C_FASTSPEED_SCLL_TRIM
#define I2C_FASTSPEED_SCLL_TRIM		6
#endif
#ifndef I2C_FASTSPEED_SCLH_TRIM
#define I2C_FASTSPEED_SCLH_TRIM		6
#endif

/* These are the trim values for high speed */
#ifndef I2C_HIGHSPEED_PHASE_ONE_SCLL_TRIM
#define I2C_HIGHSPEED_PHASE_ONE_SCLL_TRIM	I2C_FASTSPEED_SCLL_TRIM
#endif
#ifndef I2C_HIGHSPEED_PHASE_ONE_SCLH_TRIM
#define I2C_HIGHSPEED_PHASE_ONE_SCLH_TRIM	I2C_FASTSPEED_SCLH_TRIM
#endif
#ifndef I2C_HIGHSPEED_PHASE_TWO_SCLL_TRIM
#define I2C_HIGHSPEED_PHASE_TWO_SCLL_TRIM	I2C_FASTSPEED_SCLL_TRIM
#endif
#ifndef I2C_HIGHSPEED_PHASE_TWO_SCLH_TRIM
#define I2C_HIGHSPEED_PHASE_TWO_SCLH_TRIM	I2C_FASTSPEED_SCLH_TRIM
#endif

#define I2C_PSC_MAX		0x0f
#define I2C_PSC_MIN		0x00

#endif /* _OMAP24XX_I2C_H_ */