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) */
  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__ */