5b9ca52691
This is the platform function interpreter itself along with the backends for UniN/U3/U4, mac-io, GPIOs and i2c. It adds the ability to execute those do-platform-* scripts in the device-tree (at least for most devices for which a backend is provided). This should replace the clock spreading hacks properly. It might also have an impact on all sort of machines since some of the scripts marked "at init" will now be executed on boot (or some other on sleep/wakeup), those will possibly do things that the kernel didn't do at all, like setting some values into some i2c devices (changing thermal sensor calibration or conversion rate) etc... Thus regression testing is MUCH welcome. Also loook for errors in dmesg. That's also why I've left rather verbose debugging enabled in this version of the patch. (I do expect some Windtunnel G4s to show some errors as they have an i2c clock chip on the PMU bus that uses some primitives that the i2c backend doesn't implement yet. I really need users that have one of those machine to come back to me so we can get that done right, though the errors themselves should be harmless, I suspect the machine might not run at full speed). Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
108 lines
3.4 KiB
C
108 lines
3.4 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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/* 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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