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| 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
|---|---|
| 2 | /* |
| 3 | * include/asm-ppc/pmac_low_i2c.h |
| 4 | * |
| 5 | * Copyright (C) 2003 Ben. Herrenschmidt (benh@kernel.crashing.org) |
| 6 | */ |
| 7 | #ifndef __PMAC_LOW_I2C_H__ |
| 8 | #define __PMAC_LOW_I2C_H__ |
| 9 | #ifdef __KERNEL__ |
| 10 | |
| 11 | /* i2c mode (based on the platform functions format) */ |
| 12 | enum { |
| 13 | pmac_i2c_mode_dumb = 1, |
| 14 | pmac_i2c_mode_std = 2, |
| 15 | pmac_i2c_mode_stdsub = 3, |
| 16 | pmac_i2c_mode_combined = 4, |
| 17 | }; |
| 18 | |
| 19 | /* RW bit in address */ |
| 20 | enum { |
| 21 | pmac_i2c_read = 0x01, |
| 22 | pmac_i2c_write = 0x00 |
| 23 | }; |
| 24 | |
| 25 | /* i2c bus type */ |
| 26 | enum { |
| 27 | pmac_i2c_bus_keywest = 0, |
| 28 | pmac_i2c_bus_pmu = 1, |
| 29 | pmac_i2c_bus_smu = 2, |
| 30 | }; |
| 31 | |
| 32 | /* i2c bus features */ |
| 33 | enum { |
| 34 | /* can_largesub : supports >1 byte subaddresses (SMU only) */ |
| 35 | pmac_i2c_can_largesub = 0x00000001u, |
| 36 | |
| 37 | /* multibus : device node holds multiple busses, bus number is |
| 38 | * encoded in bits 0xff00 of "reg" of a given device |
| 39 | */ |
| 40 | pmac_i2c_multibus = 0x00000002u, |
| 41 | }; |
| 42 | |
| 43 | /* i2c busses in the system */ |
| 44 | struct pmac_i2c_bus; |
| 45 | struct i2c_adapter; |
| 46 | |
| 47 | /* Init, called early during boot */ |
| 48 | extern int pmac_i2c_init(void); |
| 49 | |
| 50 | /* Lookup an i2c bus for a device-node. The node can be either the bus |
| 51 | * node itself or a device below it. In the case of a multibus, the bus |
| 52 | * node itself is the controller node, else, it's a child of the controller |
| 53 | * node |
| 54 | */ |
| 55 | extern struct pmac_i2c_bus *pmac_i2c_find_bus(struct device_node *node); |
| 56 | |
| 57 | /* Get the address for an i2c device. This strips the bus number if |
| 58 | * necessary. The 7 bits address is returned 1 bit right shifted so that the |
| 59 | * direction can be directly ored in |
| 60 | */ |
| 61 | extern u8 pmac_i2c_get_dev_addr(struct device_node *device); |
| 62 | |
| 63 | /* Get infos about a bus */ |
| 64 | extern struct device_node *pmac_i2c_get_controller(struct pmac_i2c_bus *bus); |
| 65 | extern struct device_node *pmac_i2c_get_bus_node(struct pmac_i2c_bus *bus); |
| 66 | extern int pmac_i2c_get_type(struct pmac_i2c_bus *bus); |
| 67 | extern int pmac_i2c_get_flags(struct pmac_i2c_bus *bus); |
| 68 | extern int pmac_i2c_get_channel(struct pmac_i2c_bus *bus); |
| 69 | |
| 70 | /* i2c layer adapter helpers */ |
| 71 | extern struct i2c_adapter *pmac_i2c_get_adapter(struct pmac_i2c_bus *bus); |
| 72 | extern struct pmac_i2c_bus *pmac_i2c_adapter_to_bus(struct i2c_adapter *adapter); |
| 73 | |
| 74 | /* March a device or bus with an i2c adapter structure, to be used by drivers |
| 75 | * to match device-tree nodes with i2c adapters during adapter discovery |
| 76 | * callbacks |
| 77 | */ |
| 78 | extern int pmac_i2c_match_adapter(struct device_node *dev, |
| 79 | struct i2c_adapter *adapter); |
| 80 | |
| 81 | |
| 82 | /* (legacy) Locking functions exposed to i2c-keywest */ |
| 83 | extern int pmac_low_i2c_lock(struct device_node *np); |
| 84 | extern int pmac_low_i2c_unlock(struct device_node *np); |
| 85 | |
| 86 | /* Access functions for platform code */ |
| 87 | extern int pmac_i2c_open(struct pmac_i2c_bus *bus, int polled); |
| 88 | extern void pmac_i2c_close(struct pmac_i2c_bus *bus); |
| 89 | extern int pmac_i2c_setmode(struct pmac_i2c_bus *bus, int mode); |
| 90 | extern int pmac_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize, |
| 91 | u32 subaddr, u8 *data, int len); |
| 92 | |
| 93 | /* Suspend/resume code called by via-pmu directly for now */ |
| 94 | extern void pmac_pfunc_i2c_suspend(void); |
| 95 | extern void pmac_pfunc_i2c_resume(void); |
| 96 | |
| 97 | #endif /* __KERNEL__ */ |
| 98 | #endif /* __PMAC_LOW_I2C_H__ */ |
| 99 |
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