i386/linux/linux-2.3.21/include/asm-ppc/feature.h

   1 /*
   2  * Definitions for accessing the Feature Control Register (FCR)
   3  * on Power Macintoshes and similar machines.  The FCR lets us
   4  * enable/disable, reset, and power up/down various peripherals.
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file "COPYING" in the main directory of this archive
   8  * for more details.
   9  *
  10  * Copyright (C) 1998 Paul Mackerras.
  11  */
  12 #ifndef __ASM_PPC_FEATURE_H
  13 #define __ASM_PPC_FEATURE_H
  14
  15 /*
  16  * The FCR bits for particular features vary somewhat between
  17  * different machines.  So we abstract a list of features here
  18  * and let the feature_* routines map them to the actual bits.
  19  */
  20 enum system_feature {
  21         FEATURE_null,
  22         FEATURE_Serial_reset,
  23         FEATURE_Serial_enable,
  24         FEATURE_Serial_IO_A,
  25         FEATURE_Serial_IO_B,
  26         FEATURE_SWIM3_enable,
  27         FEATURE_MESH_enable,
  28         FEATURE_IDE_enable,
  29         FEATURE_VIA_enable,
  30         FEATURE_CD_power,
  31         FEATURE_Mediabay_reset,
  32         FEATURE_Mediabay_enable,
  33         FEATURE_Mediabay_PCI_enable,
  34         FEATURE_Mediabay_IDE_enable,
  35         FEATURE_Mediabay_floppy_enable,
  36         FEATURE_BMac_reset,
  37         FEATURE_BMac_IO_enable,
  38         FEATURE_Modem_Reset,
  39         FEATURE_IDE_DiskPower,
  40         FEATURE_IDE_Reset,
  41         FEATURE_last,
  42 };
  43
  44 /* Note about the device parameter: Each device gives it's own entry. If NULL,
  45    the feature function will just do nothing and return -EINVAL.
  46    The feature management will walk up the device tree until in reaches a recognized
  47    chip for which features can be changed and it will then apply the necessary
  48    features to that chip. If it's not found, -ENODEV is returned.
  49    Note also that feature_test/set/clear are interrupt-safe provided that they are
  50    called _after_ feature_init() is completed.
  51  */
  52
  53 /* Test whether a particular feature is enabled. May return -ENODEV*/
  54 extern int      feature_test(struct device_node* device, enum system_feature f);
  55
  56 /* Set a particular feature. Returns 0 or -ENODEV */
  57 extern int      feature_set(struct device_node* device, enum system_feature f);
  58
  59 /* Clear a particular feature */
  60 extern int      feature_clear(struct device_node* device, enum system_feature f);
  61
  62 /* Initialize feature stuff */
  63 extern void     feature_init(void);
  64
  65
  66 #endif /* __ASM_PPC_FEATURE_H */