1 /*
2 * i2c_pxa.h
3 *
4 * Copyright (C) 2002 Intrinsyc Software Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 */
11 #ifndef _I2C_PXA_H_
12 #define _I2C_PXA_H_
13
14 #if 0
15 #define DEF_TIMEOUT 3
16 #else
17 /* need a longer timeout if we're dealing with the fact we may well be
18 * looking at a multi-master environment
19 */
20 #define DEF_TIMEOUT 32
21 #endif
22
23 #define BUS_ERROR (-EREMOTEIO)
24 #define XFER_NAKED (-ECONNREFUSED)
25 #define I2C_RETRY (-2000) /* an error has occurred retry transmit */
26
27 /* ICR initialize bit values
28 *
29 * 15. FM 0 (100 Khz operation)
30 * 14. UR 0 (No unit reset)
31 * 13. SADIE 0 (Disables the unit from interrupting on slave addresses
32 * matching its slave address)
33 * 12. ALDIE 0 (Disables the unit from interrupt when it loses arbitration
34 * in master mode)
35 * 11. SSDIE 0 (Disables interrupts from a slave stop detected, in slave mode)
36 * 10. BEIE 1 (Enable interrupts from detected bus errors, no ACK sent)
37 * 9. IRFIE 1 (Enable interrupts from full buffer received)
38 * 8. ITEIE 1 (Enables the I2C unit to interrupt when transmit buffer empty)
39 * 7. GCD 1 (Disables i2c unit response to general call messages as a slave)
40 * 6. IUE 0 (Disable unit until we change settings)
41 * 5. SCLE 1 (Enables the i2c clock output for master mode (drives SCL)
42 * 4. MA 0 (Only send stop with the ICR stop bit)
43 * 3. TB 0 (We are not transmitting a byte initially)
44 * 2. ACKNAK 0 (Send an ACK after the unit receives a byte)
45 * 1. STOP 0 (Do not send a STOP)
46 * 0. START 0 (Do not send a START)
47 *
48 */
49 #define I2C_ICR_INIT (ICR_BEIE | ICR_IRFIE | ICR_ITEIE | ICR_GCD | ICR_SCLE)
50
51 /* I2C status register init values
52 *
53 * 10. BED 1 (Clear bus error detected)
54 * 9. SAD 1 (Clear slave address detected)
55 * 7. IRF 1 (Clear IDBR Receive Full)
56 * 6. ITE 1 (Clear IDBR Transmit Empty)
57 * 5. ALD 1 (Clear Arbitration Loss Detected)
58 * 4. SSD 1 (Clear Slave Stop Detected)
59 */
60 #define I2C_ISR_INIT 0x7FF /* status register init */
61
62 struct i2c_slave_client;
63
64 struct i2c_pxa_platform_data {
65 unsigned int slave_addr;
66 struct i2c_slave_client *slave;
67 unsigned int class;
68 unsigned int use_pio :1;
69 unsigned int fast_mode :1;
70 unsigned int high_mode:1;
71 unsigned char master_code;
72 unsigned long rate;
73 };
74 #endif
75
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