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1 | /* |
2 | * include/asm-ppc/pmac_low_i2c.h | |
3 | * | |
4 | * Copyright (C) 2003 Ben. Herrenschmidt (benh@kernel.crashing.org) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | */ | |
12 | #ifndef __PMAC_LOW_I2C_H__ | |
13 | #define __PMAC_LOW_I2C_H__ | |
88ced031 | 14 | #ifdef __KERNEL__ |
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15 | |
16 | /* i2c mode (based on the platform functions format) */ | |
17 | enum { | |
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18 | pmac_i2c_mode_dumb = 1, |
19 | pmac_i2c_mode_std = 2, | |
20 | pmac_i2c_mode_stdsub = 3, | |
21 | pmac_i2c_mode_combined = 4, | |
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22 | }; |
23 | ||
24 | /* RW bit in address */ | |
25 | enum { | |
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26 | pmac_i2c_read = 0x01, |
27 | pmac_i2c_write = 0x00 | |
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28 | }; |
29 | ||
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30 | /* i2c bus type */ |
31 | enum { | |
32 | pmac_i2c_bus_keywest = 0, | |
33 | pmac_i2c_bus_pmu = 1, | |
34 | pmac_i2c_bus_smu = 2, | |
35 | }; | |
36 | ||
37 | /* i2c bus features */ | |
38 | enum { | |
39 | /* can_largesub : supports >1 byte subaddresses (SMU only) */ | |
40 | pmac_i2c_can_largesub = 0x00000001u, | |
41 | ||
42 | /* multibus : device node holds multiple busses, bus number is | |
43 | * encoded in bits 0xff00 of "reg" of a given device | |
44 | */ | |
45 | pmac_i2c_multibus = 0x00000002u, | |
46 | }; | |
47 | ||
48 | /* i2c busses in the system */ | |
49 | struct pmac_i2c_bus; | |
50 | struct i2c_adapter; | |
51 | ||
1da177e4 | 52 | /* Init, called early during boot */ |
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53 | extern int pmac_i2c_init(void); |
54 | ||
55 | /* Lookup an i2c bus for a device-node. The node can be either the bus | |
56 | * node itself or a device below it. In the case of a multibus, the bus | |
57 | * node itself is the controller node, else, it's a child of the controller | |
58 | * node | |
59 | */ | |
60 | extern struct pmac_i2c_bus *pmac_i2c_find_bus(struct device_node *node); | |
61 | ||
62 | /* Get the address for an i2c device. This strips the bus number if | |
63 | * necessary. The 7 bits address is returned 1 bit right shifted so that the | |
64 | * direction can be directly ored in | |
65 | */ | |
66 | extern u8 pmac_i2c_get_dev_addr(struct device_node *device); | |
67 | ||
68 | /* Get infos about a bus */ | |
69 | extern struct device_node *pmac_i2c_get_controller(struct pmac_i2c_bus *bus); | |
70 | extern struct device_node *pmac_i2c_get_bus_node(struct pmac_i2c_bus *bus); | |
71 | extern int pmac_i2c_get_type(struct pmac_i2c_bus *bus); | |
72 | extern int pmac_i2c_get_flags(struct pmac_i2c_bus *bus); | |
a28d3af2 | 73 | extern int pmac_i2c_get_channel(struct pmac_i2c_bus *bus); |
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74 | |
75 | /* i2c layer adapter attach/detach */ | |
76 | extern void pmac_i2c_attach_adapter(struct pmac_i2c_bus *bus, | |
77 | struct i2c_adapter *adapter); | |
78 | extern void pmac_i2c_detach_adapter(struct pmac_i2c_bus *bus, | |
79 | struct i2c_adapter *adapter); | |
80 | extern struct i2c_adapter *pmac_i2c_get_adapter(struct pmac_i2c_bus *bus); | |
a28d3af2 | 81 | extern struct pmac_i2c_bus *pmac_i2c_adapter_to_bus(struct i2c_adapter *adapter); |
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82 | |
83 | /* March a device or bus with an i2c adapter structure, to be used by drivers | |
84 | * to match device-tree nodes with i2c adapters during adapter discovery | |
85 | * callbacks | |
86 | */ | |
87 | extern int pmac_i2c_match_adapter(struct device_node *dev, | |
88 | struct i2c_adapter *adapter); | |
89 | ||
1da177e4 | 90 | |
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91 | /* (legacy) Locking functions exposed to i2c-keywest */ |
92 | extern int pmac_low_i2c_lock(struct device_node *np); | |
93 | extern int pmac_low_i2c_unlock(struct device_node *np); | |
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94 | |
95 | /* Access functions for platform code */ | |
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96 | extern int pmac_i2c_open(struct pmac_i2c_bus *bus, int polled); |
97 | extern void pmac_i2c_close(struct pmac_i2c_bus *bus); | |
98 | extern int pmac_i2c_setmode(struct pmac_i2c_bus *bus, int mode); | |
99 | extern int pmac_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize, | |
100 | u32 subaddr, u8 *data, int len); | |
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101 | |
102 | ||
88ced031 | 103 | #endif /* __KERNEL__ */ |
1da177e4 | 104 | #endif /* __PMAC_LOW_I2C_H__ */ |