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/*
* Definitions for accessing the Feature Control Register (FCR)
* on Power Macintoshes and similar machines. The FCR lets us
* enable/disable, reset, and power up/down various peripherals.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1998 Paul Mackerras.
*/
#ifndef __ASM_PPC_FEATURE_H
#define __ASM_PPC_FEATURE_H
/*
* The FCR bits for particular features vary somewhat between
* different machines. So we abstract a list of features here
* and let the feature_* routines map them to the actual bits.
*/
enum system_feature {
FEATURE_null,
FEATURE_Serial_reset,
FEATURE_Serial_enable,
FEATURE_Serial_IO_A,
FEATURE_Serial_IO_B,
FEATURE_SWIM3_enable,
FEATURE_MESH_enable,
FEATURE_IDE_enable,
FEATURE_VIA_enable,
FEATURE_CD_power,
FEATURE_Mediabay_reset,
FEATURE_Mediabay_enable,
FEATURE_Mediabay_PCI_enable,
FEATURE_Mediabay_IDE_enable,
FEATURE_Mediabay_floppy_enable,
FEATURE_BMac_reset,
FEATURE_BMac_IO_enable,
FEATURE_Modem_PowerOn,
FEATURE_Modem_Reset,
FEATURE_last,
};
/* Note about the device parameter: Each device gives it's own entry. If NULL,
the feature function will just do nothing and return -EINVAL.
The feature management will walk up the device tree until in reaches a recognized
chip for which features can be changed and it will then apply the necessary
features to that chip. If it's not found, -ENODEV is returned.
Note also that feature_test/set/clear are interrupt-safe provided that they are
called _after_ feature_init() is completed.
*/
/* Test whether a particular feature is enabled. May return -ENODEV*/
extern int feature_test(struct device_node* device, enum system_feature f);
/* Set a particular feature. Returns 0 or -ENODEV */
extern int feature_set(struct device_node* device, enum system_feature f);
/* Clear a particular feature */
extern int feature_clear(struct device_node* device, enum system_feature f);
/* Initialize feature stuff */
extern void feature_init(void);
#endif /* __ASM_PPC_FEATURE_H */
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