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