/arch/powerpc/include/asm/pmac_low_i2c.h

  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) */
 17enum {
 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 */
 25enum {
 26	pmac_i2c_read		= 0x01,
 27	pmac_i2c_write		= 0x00
 28};
 29
 30/* i2c bus type */
 31enum {
 32	pmac_i2c_bus_keywest	= 0,
 33	pmac_i2c_bus_pmu	= 1,
 34	pmac_i2c_bus_smu	= 2,
 35};
 36
 37/* i2c bus features */
 38enum {
 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 */
 49struct pmac_i2c_bus;
 50struct i2c_adapter;
 51
 52/* Init, called early during boot */
 53extern 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 */
 60extern 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 */
 66extern u8 pmac_i2c_get_dev_addr(struct device_node *device);
 67
 68/* Get infos about a bus */
 69extern struct device_node *pmac_i2c_get_controller(struct pmac_i2c_bus *bus);
 70extern struct device_node *pmac_i2c_get_bus_node(struct pmac_i2c_bus *bus);
 71extern int pmac_i2c_get_type(struct pmac_i2c_bus *bus);
 72extern int pmac_i2c_get_flags(struct pmac_i2c_bus *bus);
 73extern int pmac_i2c_get_channel(struct pmac_i2c_bus *bus);
 74
 75/* i2c layer adapter helpers */
 76extern struct i2c_adapter *pmac_i2c_get_adapter(struct pmac_i2c_bus *bus);
 77extern 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 */
 83extern int pmac_i2c_match_adapter(struct device_node *dev,
 84				  struct i2c_adapter *adapter);
 85
 86
 87/* (legacy) Locking functions exposed to i2c-keywest */
 88extern int pmac_low_i2c_lock(struct device_node *np);
 89extern int pmac_low_i2c_unlock(struct device_node *np);
 90
 91/* Access functions for platform code */
 92extern int pmac_i2c_open(struct pmac_i2c_bus *bus, int polled);
 93extern void pmac_i2c_close(struct pmac_i2c_bus *bus);
 94extern int pmac_i2c_setmode(struct pmac_i2c_bus *bus, int mode);
 95extern 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 */
 99extern void pmac_pfunc_i2c_suspend(void);
100extern void pmac_pfunc_i2c_resume(void);
101
102#endif /* __KERNEL__ */
103#endif /* __PMAC_LOW_I2C_H__ */