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a28d3af2a2
This is the continuation of the previous patch. This one removes the old PowerMac i2c drivers (i2c-keywest and i2c-pmac-smu) and replaces them both with a single stub driver that uses the new PowerMac low i2c layer. Now that i2c-keywest is gone, the low-i2c code is extended to support interrupt driver transfers. All i2c busses now appear as platform devices. Compatibility with existing drivers should be maintained as the i2c bus names have been kept identical, except for the SMU bus but in that later case, all users has been fixed. With that patch added, matching a device node to an i2c_adapter becomes trivial. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
104 lines
3.3 KiB
C
104 lines
3.3 KiB
C
/*
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* include/asm-ppc/pmac_low_i2c.h
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*
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* Copyright (C) 2003 Ben. Herrenschmidt (benh@kernel.crashing.org)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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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 attach/detach */
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extern void pmac_i2c_attach_adapter(struct pmac_i2c_bus *bus,
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struct i2c_adapter *adapter);
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extern void pmac_i2c_detach_adapter(struct pmac_i2c_bus *bus,
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struct i2c_adapter *adapter);
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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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#endif /* __KERNEL__ */
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#endif /* __PMAC_LOW_I2C_H__ */
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