1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * i2c_pxa.h
4 *
5 * Copyright (C) 2002 Intrinsyc Software Inc.
6 */
7 #ifndef _I2C_PXA_H_
8 #define _I2C_PXA_H_
9
10 #if 0
11 #define DEF_TIMEOUT 3
12 #else
13 /* need a longer timeout if we're dealing with the fact we may well be
14 * looking at a multi-master environment
15 */
16 #define DEF_TIMEOUT 32
17 #endif
18
19 #define BUS_ERROR (-EREMOTEIO)
20 #define XFER_NAKED (-ECONNREFUSED)
21 #define I2C_RETRY (-2000) /* an error has occurred retry transmit */
22
23 /* ICR initialize bit values
24 *
25 * 15. FM 0 (100 Khz operation)
26 * 14. UR 0 (No unit reset)
27 * 13. SADIE 0 (Disables the unit from interrupting on slave addresses
28 * matching its slave address)
29 * 12. ALDIE 0 (Disables the unit from interrupt when it loses arbitration
30 * in master mode)
31 * 11. SSDIE 0 (Disables interrupts from a slave stop detected, in slave mode)
32 * 10. BEIE 1 (Enable interrupts from detected bus errors, no ACK sent)
33 * 9. IRFIE 1 (Enable interrupts from full buffer received)
34 * 8. ITEIE 1 (Enables the I2C unit to interrupt when transmit buffer empty)
35 * 7. GCD 1 (Disables i2c unit response to general call messages as a slave)
36 * 6. IUE 0 (Disable unit until we change settings)
37 * 5. SCLE 1 (Enables the i2c clock output for master mode (drives SCL)
38 * 4. MA 0 (Only send stop with the ICR stop bit)
39 * 3. TB 0 (We are not transmitting a byte initially)
40 * 2. ACKNAK 0 (Send an ACK after the unit receives a byte)
41 * 1. STOP 0 (Do not send a STOP)
42 * 0. START 0 (Do not send a START)
43 *
44 */
45 #define I2C_ICR_INIT (ICR_BEIE | ICR_IRFIE | ICR_ITEIE | ICR_GCD | ICR_SCLE)
46
47 /* I2C status register init values
48 *
49 * 10. BED 1 (Clear bus error detected)
50 * 9. SAD 1 (Clear slave address detected)
51 * 7. IRF 1 (Clear IDBR Receive Full)
52 * 6. ITE 1 (Clear IDBR Transmit Empty)
53 * 5. ALD 1 (Clear Arbitration Loss Detected)
54 * 4. SSD 1 (Clear Slave Stop Detected)
55 */
56 #define I2C_ISR_INIT 0x7FF /* status register init */
57
58 struct i2c_slave_client;
59
60 struct i2c_pxa_platform_data {
61 unsigned int slave_addr;
62 struct i2c_slave_client *slave;
63 unsigned int class;
64 unsigned int use_pio :1;
65 unsigned int fast_mode :1;
66 unsigned int high_mode:1;
67 unsigned char master_code;
68 unsigned long rate;
69 };
70 #endif