include/asm-ppc/ppc4xx_pic.h

   1 /*
   2  * include/asm-ppc/ppc4xx_pic.h
   3  *
   4  * Interrupt controller driver for PowerPC 4xx-based processors.
   5  *
   6  * Copyright (c) 1999 Grant Erickson <grant@lcse.umn.edu>
   7  *
   8  * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
   9  * Copyright (c) 2004 Zultys Technologies
  10  *
  11  * This program is free software; you can redistribute  it and/or modify it
  12  * under  the terms of  the GNU General  Public License as published by the
  13  * Free Software Foundation;  either version 2 of the  License, or (at your
  14  * option) any later version.
  15  */
  16
  17 #ifndef __PPC4XX_PIC_H__
  18 #define __PPC4XX_PIC_H__
  19
  20 #include <linux/types.h>
  21 #include <linux/irq.h>
  22
  23 /* "Fixed" UIC settings (they are chip, not board specific),
  24  * e.g. polarity/triggerring for internal interrupt sources.
  25  *
  26  * Platform port should provide NR_UICS-sized array named ppc4xx_core_uic_cfg
  27  * with these "fixed" settings: .polarity contains exact value which will
  28  * be written (masked with "ext_irq_mask") into UICx_PR register,
  29  * .triggering - to UICx_TR.
  30  *
  31  * Settings for external IRQs can be specified separately by the
  32  * board support code. In this case properly sized array of unsigned
  33  * char named ppc4xx_uic_ext_irq_cfg should be filled with correct
  34  * values using IRQ_SENSE_XXXXX and IRQ_POLARITY_XXXXXXX defines.
  35  *
  36  * If these arrays aren't provided, UIC initialization code keeps firmware
  37  * configuration. Also, ppc4xx_uic_ext_irq_cfg implies ppc4xx_core_uic_cfg
  38  * is defined.
  39  *
  40  * Both ppc4xx_core_uic_cfg and ppc4xx_uic_ext_irq_cfg are declared as
  41  * "weak" symbols in ppc4xx_pic.c
  42  *
  43  */
  44 struct ppc4xx_uic_settings {
  45         u32 polarity;
  46         u32 triggering;
  47         u32 ext_irq_mask;
  48 };
  49
  50 extern void ppc4xx_pic_init(void);
  51
  52 #endif                          /* __PPC4XX_PIC_H__ */