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