LXR linux/arch/powerpc/include/asm/pmac_low

   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__ */
 104