Current File : //usr/src/linux-headers-5.15.0-43/arch/powerpc/include/asm/pmac_low_i2c.h
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* include/asm-ppc/pmac_low_i2c.h
*
* Copyright (C) 2003 Ben. Herrenschmidt (benh@kernel.crashing.org)
*/
#ifndef __PMAC_LOW_I2C_H__
#define __PMAC_LOW_I2C_H__
#ifdef __KERNEL__
/* i2c mode (based on the platform functions format) */
enum {
pmac_i2c_mode_dumb = 1,
pmac_i2c_mode_std = 2,
pmac_i2c_mode_stdsub = 3,
pmac_i2c_mode_combined = 4,
};
/* RW bit in address */
enum {
pmac_i2c_read = 0x01,
pmac_i2c_write = 0x00
};
/* i2c bus type */
enum {
pmac_i2c_bus_keywest = 0,
pmac_i2c_bus_pmu = 1,
pmac_i2c_bus_smu = 2,
};
/* i2c bus features */
enum {
/* can_largesub : supports >1 byte subaddresses (SMU only) */
pmac_i2c_can_largesub = 0x00000001u,
/* multibus : device node holds multiple busses, bus number is
* encoded in bits 0xff00 of "reg" of a given device
*/
pmac_i2c_multibus = 0x00000002u,
};
/* i2c busses in the system */
struct pmac_i2c_bus;
struct i2c_adapter;
/* Init, called early during boot */
extern int pmac_i2c_init(void);
/* Lookup an i2c bus for a device-node. The node can be either the bus
* node itself or a device below it. In the case of a multibus, the bus
* node itself is the controller node, else, it's a child of the controller
* node
*/
extern struct pmac_i2c_bus *pmac_i2c_find_bus(struct device_node *node);
/* Get the address for an i2c device. This strips the bus number if
* necessary. The 7 bits address is returned 1 bit right shifted so that the
* direction can be directly ored in
*/
extern u8 pmac_i2c_get_dev_addr(struct device_node *device);
/* Get infos about a bus */
extern struct device_node *pmac_i2c_get_controller(struct pmac_i2c_bus *bus);
extern struct device_node *pmac_i2c_get_bus_node(struct pmac_i2c_bus *bus);
extern int pmac_i2c_get_type(struct pmac_i2c_bus *bus);
extern int pmac_i2c_get_flags(struct pmac_i2c_bus *bus);
extern int pmac_i2c_get_channel(struct pmac_i2c_bus *bus);
/* i2c layer adapter helpers */
extern struct i2c_adapter *pmac_i2c_get_adapter(struct pmac_i2c_bus *bus);
extern struct pmac_i2c_bus *pmac_i2c_adapter_to_bus(struct i2c_adapter *adapter);
/* March a device or bus with an i2c adapter structure, to be used by drivers
* to match device-tree nodes with i2c adapters during adapter discovery
* callbacks
*/
extern int pmac_i2c_match_adapter(struct device_node *dev,
struct i2c_adapter *adapter);
/* (legacy) Locking functions exposed to i2c-keywest */
extern int pmac_low_i2c_lock(struct device_node *np);
extern int pmac_low_i2c_unlock(struct device_node *np);
/* Access functions for platform code */
extern int pmac_i2c_open(struct pmac_i2c_bus *bus, int polled);
extern void pmac_i2c_close(struct pmac_i2c_bus *bus);
extern int pmac_i2c_setmode(struct pmac_i2c_bus *bus, int mode);
extern int pmac_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize,
u32 subaddr, u8 *data, int len);
/* Suspend/resume code called by via-pmu directly for now */
extern void pmac_pfunc_i2c_suspend(void);
extern void pmac_pfunc_i2c_resume(void);
#endif /* __KERNEL__ */
#endif /* __PMAC_LOW_I2C_H__ */
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