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      1 /* $NetBSD: pic_prepivr.c,v 1.9 2017/06/01 02:45:07 chs Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2007 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Tim Rightnour
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: pic_prepivr.c,v 1.9 2017/06/01 02:45:07 chs Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/kmem.h>
     37 #include <sys/kernel.h>
     38 #include <sys/intr.h>
     39 
     40 #include <uvm/uvm_extern.h>
     41 
     42 #include <machine/pio.h>
     43 
     44 #include <powerpc/pic/picvar.h>
     45 
     46 #include <dev/isa/isareg.h>
     47 #include <dev/isa/isavar.h>
     48 
     49 static int  prepivr_get_irq(struct pic_ops *, int);
     50 static int  motivr_get_irq(struct pic_ops *, int);
     51 static void prepivr_establish_irq(struct pic_ops *, int, int, int);
     52 
     53 extern vaddr_t prep_intr_reg;	/* PReP interrupt vector register */
     54 extern uint32_t prep_intr_reg_off; /* IVR offset within the mapped page */
     55 
     56 #define IO_ELCR1	0x4d0
     57 #define IO_ELCR2	0x4d1
     58 
     59 /*
     60  * Prior to calling init_prepivr, the port is expected to have mapped the
     61  * page containing the IVR with mapiodev to prep_intr_reg and set up the
     62  * prep_intr_reg_off.
     63  */
     64 
     65 struct pic_ops *
     66 setup_prepivr(int ivrtype)
     67 {
     68 	struct i8259_ops *prepivr;
     69 	struct pic_ops *pic;
     70 	uint32_t pivr;
     71 
     72 	prepivr = kmem_alloc(sizeof(*prepivr), KM_SLEEP);
     73 	pic = &prepivr->pic;
     74 
     75 	pivr = prep_intr_reg + prep_intr_reg_off;
     76 	pic->pic_numintrs = 16;
     77 	pic->pic_cookie = (void *)pivr;
     78 	pic->pic_enable_irq = i8259_enable_irq;
     79 	pic->pic_reenable_irq = i8259_enable_irq;
     80 	pic->pic_disable_irq = i8259_disable_irq;
     81 	if (ivrtype == PIC_IVR_MOT)
     82 		pic->pic_get_irq = motivr_get_irq;
     83 	else
     84 		pic->pic_get_irq = prepivr_get_irq;
     85 	pic->pic_ack_irq = i8259_ack_irq;
     86 	pic->pic_establish_irq = prepivr_establish_irq;
     87 	pic->pic_finish_setup = NULL;
     88 	strcpy(pic->pic_name, "prepivr");
     89 	pic_add(pic);
     90 	prepivr->pending_events = 0;
     91 	prepivr->enable_mask = 0xffffffff;
     92 	prepivr->irqs = 0;
     93 
     94 	/* initialize the ELCR */
     95 	isa_outb(IO_ELCR1, (0 >> 0) & 0xff);
     96 	isa_outb(IO_ELCR2, (0 >> 8) & 0xff);
     97 	i8259_initialize();
     98 
     99 	return pic;
    100 }
    101 
    102 static void
    103 prepivr_establish_irq(struct pic_ops *pic, int irq, int type, int maxlevel)
    104 {
    105 	u_int8_t elcr[2];
    106 	int icu, bit;
    107 
    108 	icu = irq / 8;
    109 	bit = irq % 8;
    110 	elcr[0] = isa_inb(IO_ELCR1);
    111 	elcr[1] = isa_inb(IO_ELCR2);
    112 
    113 	if (type == IST_LEVEL)
    114 		elcr[icu] |= 1 << bit;
    115 	else
    116 		elcr[icu] &= ~(1 << bit);
    117 
    118 	isa_outb(IO_ELCR1, elcr[0]);
    119 	isa_outb(IO_ELCR2, elcr[1]);
    120 }
    121 
    122 static int
    123 motivr_get_irq(struct pic_ops *pic, int mode)
    124 {
    125 	int irq;
    126 
    127 	irq = i8259_get_irq(pic, mode);
    128 	/* read the IVR to ack it */
    129 	(void)inb(pic->pic_cookie);
    130 
    131 	/* i8259_get_irq will return 255 by itself, so just pass it on */
    132 	return irq;
    133 }
    134 
    135 static int
    136 prepivr_get_irq(struct pic_ops *pic, int mode)
    137 {
    138 	int irq;
    139 
    140 	irq = inb(pic->pic_cookie);
    141 
    142 	if (irq == 0 && mode == PIC_GET_IRQ)
    143 		return 255;
    144 	if (irq == 7 && mode == PIC_GET_RECHECK)
    145 		return 255;
    146 
    147 	return irq;
    148 }
    149