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mvsoc_intr.c revision 1.4 
      1 /*	$NetBSD: mvsoc_intr.c,v 1.4 2012/07/22 17:14:18 jakllsch Exp $	*/
      2 /*
      3  * Copyright (c) 2010 KIYOHARA Takashi
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     18  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
     19  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     23  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
     24  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     25  * POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include <sys/cdefs.h>
     29 __KERNEL_RCSID(0, "$NetBSD: mvsoc_intr.c,v 1.4 2012/07/22 17:14:18 jakllsch Exp $");
     30 
     31 #define _INTR_PRIVATE
     32 
     33 #include <sys/param.h>
     34 #include <sys/proc.h>
     35 
     36 #include <machine/intr.h>
     37 
     38 #include <arm/cpu.h>
     39 #include <arm/pic/picvar.h>
     40 #include <arm/marvell/mvsocreg.h>
     41 #include <arm/marvell/mvsocvar.h>
     42 
     43 
     44 static void mvsoc_bridge_pic_unblock_irqs(struct pic_softc *, size_t, uint32_t);
     45 static void mvsoc_bridge_pic_block_irqs(struct pic_softc *, size_t, uint32_t);
     46 static int mvsoc_bridge_pic_find_pending_irqs(struct pic_softc *);
     47 static void mvsoc_bridge_pic_establish_irq(struct pic_softc *,
     48 					   struct intrsource *);
     49 static void mvsoc_bridge_pic_source_name(struct pic_softc *, int, char *,
     50 					 size_t);
     51 
     52 static const char * const sources[] = {
     53     "CPUSelfInt",      "CPUTimer0IntReq", "CPUTimer1IntReq", "CPUWDTimerIntReq",
     54     "AccessErr",       "Bit64Err",
     55 };
     56 
     57 static struct pic_ops mvsoc_bridge_picops = {
     58 	.pic_unblock_irqs = mvsoc_bridge_pic_unblock_irqs,
     59 	.pic_block_irqs = mvsoc_bridge_pic_block_irqs,
     60 	.pic_find_pending_irqs = mvsoc_bridge_pic_find_pending_irqs,
     61 	.pic_establish_irq = mvsoc_bridge_pic_establish_irq,
     62 	.pic_source_name = mvsoc_bridge_pic_source_name,
     63 };
     64 
     65 struct pic_softc mvsoc_bridge_pic = {
     66 	.pic_ops = &mvsoc_bridge_picops,
     67 	.pic_maxsources = MVSOC_MLMB_MLMBI_NIRQ,
     68 	.pic_name = "mvsoc_bridge",
     69 };
     70 
     71 
     72 void
     73 mvsoc_irq_handler(void *frame)
     74 {
     75 	struct cpu_info * const ci = curcpu();
     76 	const int oldipl = ci->ci_cpl;
     77 	const uint32_t oldipl_mask = __BIT(oldipl);
     78 	int ipl_mask = 0;
     79 
     80 	ci->ci_data.cpu_nintr++;
     81 
     82 	ipl_mask = find_pending_irqs();
     83 
     84 	/*
     85 	 * Record the pending_ipls and deliver them if we can.
     86 	 */
     87 	if ((ipl_mask & ~oldipl_mask) > oldipl_mask)
     88 		pic_do_pending_ints(I32_bit, oldipl, frame);
     89 }
     90 
     91 /*
     92  * Mbus-L to Mbus bridge
     93  */
     94 
     95 void *
     96 mvsoc_bridge_intr_establish(int ih, int ipl, int (*ih_func)(void *), void *arg)
     97 {
     98 
     99 	return intr_establish(mvsoc_bridge_pic.pic_irqbase + ih, ipl,
    100 	    IST_LEVEL_HIGH, ih_func, arg);
    101 }
    102 
    103 /* ARGSUSED */
    104 static void
    105 mvsoc_bridge_pic_unblock_irqs(struct pic_softc *pic, size_t irqbase,
    106 			      uint32_t irq_mask)
    107 {
    108 
    109 	write_mlmbreg(MVSOC_MLMB_MLMBICR,
    110 	    read_mlmbreg(MVSOC_MLMB_MLMBICR) & ~irq_mask);
    111 	write_mlmbreg(MVSOC_MLMB_MLMBIMR,
    112 	    read_mlmbreg(MVSOC_MLMB_MLMBIMR) | irq_mask);
    113 }
    114 
    115 /* ARGSUSED */
    116 static void
    117 mvsoc_bridge_pic_block_irqs(struct pic_softc *pic, size_t irqbase,
    118 			    uint32_t irq_mask)
    119 {
    120 
    121 	write_mlmbreg(MVSOC_MLMB_MLMBIMR,
    122 	    read_mlmbreg(MVSOC_MLMB_MLMBIMR) & ~irq_mask);
    123 }
    124 
    125 static int
    126 mvsoc_bridge_pic_find_pending_irqs(struct pic_softc *pic)
    127 {
    128 	uint32_t pending;
    129 
    130 	pending =
    131 	    read_mlmbreg(MVSOC_MLMB_MLMBICR) & read_mlmbreg(MVSOC_MLMB_MLMBIMR);
    132 
    133 	if (pending == 0)
    134 		return 0;
    135 
    136 	return pic_mark_pending_sources(pic, 0, pending);
    137 }
    138 
    139 /* ARGSUSED */
    140 static void
    141 mvsoc_bridge_pic_establish_irq(struct pic_softc *pic, struct intrsource *is)
    142 {
    143 	/* Nothing */
    144 }
    145 
    146 static void
    147 mvsoc_bridge_pic_source_name(struct pic_softc *pic, int irq, char *buf,
    148 			     size_t len)
    149 {
    150 
    151 	strlcpy(buf, sources[irq], len);
    152 }
    153