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__
14 #ifdef __KERNEL__
15 
16 /* i2c mode (based on the platform functions format) */
17 enum {
18 	pmac_i2c_mode_dumb	= 1,
19 	pmac_i2c_mode_std	= 2,
20 	pmac_i2c_mode_stdsub	= 3,
21 	pmac_i2c_mode_combined	= 4,
22 };
23 
24 /* RW bit in address */
25 enum {
26 	pmac_i2c_read		= 0x01,
27 	pmac_i2c_write		= 0x00
28 };
29 
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 
52 /* Init, called early during boot */
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);
73 extern int pmac_i2c_get_channel(struct pmac_i2c_bus *bus);
74 
75 /* i2c layer adapter helpers */
76 extern struct i2c_adapter *pmac_i2c_get_adapter(struct pmac_i2c_bus *bus);
77 extern struct pmac_i2c_bus *pmac_i2c_adapter_to_bus(struct i2c_adapter *adapter);
78 
79 /* March a device or bus with an i2c adapter structure, to be used by drivers
80  * to match device-tree nodes with i2c adapters during adapter discovery
81  * callbacks
82  */
83 extern int pmac_i2c_match_adapter(struct device_node *dev,
84 				  struct i2c_adapter *adapter);
85 
86 
87 /* (legacy) Locking functions exposed to i2c-keywest */
88 extern int pmac_low_i2c_lock(struct device_node *np);
89 extern int pmac_low_i2c_unlock(struct device_node *np);
90 
91 /* Access functions for platform code */
92 extern int pmac_i2c_open(struct pmac_i2c_bus *bus, int polled);
93 extern void pmac_i2c_close(struct pmac_i2c_bus *bus);
94 extern int pmac_i2c_setmode(struct pmac_i2c_bus *bus, int mode);
95 extern int pmac_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize,
96 			 u32 subaddr, u8 *data,  int len);
97 
98 /* Suspend/resume code called by via-pmu directly for now */
99 extern void pmac_pfunc_i2c_suspend(void);
100 extern void pmac_pfunc_i2c_resume(void);
101 
102 #endif /* __KERNEL__ */
103 #endif /* __PMAC_LOW_I2C_H__ */
104