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      1 /*	$NetBSD: i80321_intr.h,v 1.13 2021/08/06 08:58:42 rin Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2001, 2002, 2006 Wasabi Systems, Inc.
      5  * All rights reserved.
      6  *
      7  * Written by Jason R. Thorpe and Steve C. Woodford for Wasabi Systems, Inc.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed for the NetBSD Project by
     20  *	Wasabi Systems, Inc.
     21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     22  *    or promote products derived from this software without specific prior
     23  *    written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     35  * POSSIBILITY OF SUCH DAMAGE.
     36  */
     37 
     38 #ifndef _I80321_INTR_H_
     39 #ifndef _NO_INTR_H_
     40 #define _I80321_INTR_H_
     41 
     42 #define	ARM_IRQ_HANDLER	_C_LABEL(i80321_intr_dispatch)
     43 
     44 #ifndef _LOCORE
     45 
     46 #include <arm/armreg.h>
     47 #include <arm/cpufunc.h>
     48 #include <arm/cpu.h>
     49 
     50 #include <arm/xscale/i80321reg.h>
     51 
     52 static inline void __attribute__((__unused__))
     53 i80321_set_intrmask(void)
     54 {
     55 	extern volatile uint32_t intr_enabled;
     56 
     57 	__asm volatile("mcr p6, 0, %0, c0, c0, 0"
     58 		:
     59 		: "r" (intr_enabled & ICU_INT_HWMASK));
     60 }
     61 
     62 #define INT_HPIMASK	(1u << ICU_INT_HPI)
     63 extern volatile uint32_t intr_enabled;
     64 extern volatile int i80321_ipending;
     65 extern int i80321_imask[];
     66 
     67 static inline void __attribute__((__unused__))
     68 i80321_splx(int new)
     69 {
     70 	int oldirqstate, hwpend;
     71 
     72 	/* Don't let the compiler re-order this code with preceding code */
     73 	__insn_barrier();
     74 
     75 	set_curcpl(new);
     76 
     77 	hwpend = (i80321_ipending & ICU_INT_HWMASK) & ~i80321_imask[new];
     78 	if (hwpend != 0) {
     79 		oldirqstate = disable_interrupts(I32_bit);
     80 		intr_enabled |= hwpend;
     81 		i80321_set_intrmask();
     82 #ifdef I80321_HPI_ENABLED
     83 		if (__predict_false(hwpend & INT_HPIMASK))
     84 			oldirqstate &= ~I32_bit;
     85 #endif
     86 		restore_interrupts(oldirqstate);
     87 	}
     88 
     89 #ifdef __HAVE_FAST_SOFTINTS
     90 	cpu_dosoftints();
     91 #endif
     92 }
     93 
     94 static inline int __attribute__((__unused__))
     95 i80321_splraise(int ipl)
     96 {
     97 	int old = curcpl();
     98 
     99 	if (ipl > old) {
    100 		set_curcpl(ipl);
    101 		/*
    102 		 * Don't let the compiler re-order this code with
    103 		 * subsequent code
    104 		 */
    105 		__insn_barrier();
    106 	}
    107 
    108 	return (old);
    109 }
    110 
    111 static inline int __attribute__((__unused__))
    112 i80321_spllower(int ipl)
    113 {
    114 	int old = curcpl();
    115 	i80321_splx(ipl);
    116 	return(old);
    117 }
    118 
    119 
    120 #if !defined(EVBARM_SPL_NOINLINE)
    121 
    122 #define splx(new)		i80321_splx(new)
    123 #define	_spllower(ipl)		i80321_spllower(ipl)
    124 #define	_splraise(ipl)		i80321_splraise(ipl)
    125 
    126 #else
    127 
    128 int	_splraise(int);
    129 int	_spllower(int);
    130 void	splx(int);
    131 
    132 #endif /* ! EVBARM_SPL_NOINLINE */
    133 
    134 #endif /* _LOCORE */
    135 
    136 #endif /* _NO_INTR_H_ */
    137 #endif /* _I80321_INTR_H_ */
    138