diff options
Diffstat (limited to 'arch/powerpc/include/asm/pmac_low_i2c.h')
| -rw-r--r-- | arch/powerpc/include/asm/pmac_low_i2c.h | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/pmac_low_i2c.h b/arch/powerpc/include/asm/pmac_low_i2c.h new file mode 100644 index 00000000000..131011bd7e7 --- /dev/null +++ b/arch/powerpc/include/asm/pmac_low_i2c.h @@ -0,0 +1,107 @@ +/* + * include/asm-ppc/pmac_low_i2c.h + * + * Copyright (C) 2003 Ben. Herrenschmidt (benh@kernel.crashing.org) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + */ +#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 attach/detach */ +extern void pmac_i2c_attach_adapter(struct pmac_i2c_bus *bus, + struct i2c_adapter *adapter); +extern void pmac_i2c_detach_adapter(struct pmac_i2c_bus *bus, + struct i2c_adapter *adapter); +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__ */ |