/* $NetBSD: pic_prepivr.c,v 1.9 2017/06/01 02:45:07 chs Exp $ */
/*-
* Copyright (c) 2007 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Tim Rightnour
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pic_prepivr.c,v 1.9 2017/06/01 02:45:07 chs Exp $");
#include <sys/param.h>
#include <sys/kmem.h>
#include <sys/kernel.h>
#include <sys/intr.h>
#include <uvm/uvm_extern.h>
#include <machine/pio.h>
#include <powerpc/pic/picvar.h>
#include <dev/isa/isareg.h>
#include <dev/isa/isavar.h>
static int prepivr_get_irq(struct pic_ops *, int);
static int motivr_get_irq(struct pic_ops *, int);
static void prepivr_establish_irq(struct pic_ops *, int, int, int);
extern vaddr_t prep_intr_reg; /* PReP interrupt vector register */
extern uint32_t prep_intr_reg_off; /* IVR offset within the mapped page */
#define IO_ELCR1 0x4d0
#define IO_ELCR2 0x4d1
/*
* Prior to calling init_prepivr, the port is expected to have mapped the
* page containing the IVR with mapiodev to prep_intr_reg and set up the
* prep_intr_reg_off.
*/
struct pic_ops *
setup_prepivr(int ivrtype)
{
struct i8259_ops *prepivr;
struct pic_ops *pic;
uint32_t pivr;
prepivr = kmem_alloc(sizeof(*prepivr), KM_SLEEP);
pic = &prepivr->pic;
pivr = prep_intr_reg + prep_intr_reg_off;
pic->pic_numintrs = 16;
pic->pic_cookie = (void *)pivr;
pic->pic_enable_irq = i8259_enable_irq;
pic->pic_reenable_irq = i8259_enable_irq;
pic->pic_disable_irq = i8259_disable_irq;
if (ivrtype == PIC_IVR_MOT)
pic->pic_get_irq = motivr_get_irq;
else
pic->pic_get_irq = prepivr_get_irq;
pic->pic_ack_irq = i8259_ack_irq;
pic->pic_establish_irq = prepivr_establish_irq;
pic->pic_finish_setup = NULL;
strcpy(pic->pic_name, "prepivr");
pic_add(pic);
prepivr->pending_events = 0;
prepivr->enable_mask = 0xffffffff;
prepivr->irqs = 0;
/* initialize the ELCR */
isa_outb(IO_ELCR1, (0 >> 0) & 0xff);
isa_outb(IO_ELCR2, (0 >> 8) & 0xff);
i8259_initialize();
return pic;
}
static void
prepivr_establish_irq(struct pic_ops *pic, int irq, int type, int maxlevel)
{
u_int8_t elcr[2];
int icu, bit;
icu = irq / 8;
bit = irq % 8;
elcr[0] = isa_inb(IO_ELCR1);
elcr[1] = isa_inb(IO_ELCR2);
if (type == IST_LEVEL)
elcr[icu] |= 1 << bit;
else
elcr[icu] &= ~(1 << bit);
isa_outb(IO_ELCR1, elcr[0]);
isa_outb(IO_ELCR2, elcr[1]);
}
static int
motivr_get_irq(struct pic_ops *pic, int mode)
{
int irq;
irq = i8259_get_irq(pic, mode);
/* read the IVR to ack it */
(void)inb(pic->pic_cookie);
/* i8259_get_irq will return 255 by itself, so just pass it on */
return irq;
}
static int
prepivr_get_irq(struct pic_ops *pic, int mode)
{
int irq;
irq = inb(pic->pic_cookie);
if (irq == 0 && mode == PIC_GET_IRQ)
return 255;
if (irq == 7 && mode == PIC_GET_RECHECK)
return 255;
return irq;
}
