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git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blob - arch/powerpc/include/asm/pmac_low_i2c.h
2 * include/asm-ppc/pmac_low_i2c.h
4 * Copyright (C) 2003 Ben. Herrenschmidt (benh@kernel.crashing.org)
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.
12 #ifndef __PMAC_LOW_I2C_H__
13 #define __PMAC_LOW_I2C_H__
16 /* i2c mode (based on the platform functions format) */
18 pmac_i2c_mode_dumb
= 1,
19 pmac_i2c_mode_std
= 2,
20 pmac_i2c_mode_stdsub
= 3,
21 pmac_i2c_mode_combined
= 4,
24 /* RW bit in address */
32 pmac_i2c_bus_keywest
= 0,
37 /* i2c bus features */
39 /* can_largesub : supports >1 byte subaddresses (SMU only) */
40 pmac_i2c_can_largesub
= 0x00000001u
,
42 /* multibus : device node holds multiple busses, bus number is
43 * encoded in bits 0xff00 of "reg" of a given device
45 pmac_i2c_multibus
= 0x00000002u
,
48 /* i2c busses in the system */
52 /* Init, called early during boot */
53 extern int pmac_i2c_init(void);
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
60 extern struct pmac_i2c_bus
*pmac_i2c_find_bus(struct device_node
*node
);
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
66 extern u8
pmac_i2c_get_dev_addr(struct device_node
*device
);
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
);
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
);
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
83 extern int pmac_i2c_match_adapter(struct device_node
*dev
,
84 struct i2c_adapter
*adapter
);
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
);
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
);
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);
102 #endif /* __KERNEL__ */
103 #endif /* __PMAC_LOW_I2C_H__ */