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324 lines
7.6 KiB
C
324 lines
7.6 KiB
C
/*-
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* Copyright (c) 1998 Doug Rabson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <machine/bus.h>
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#include <sys/malloc.h>
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#include <sys/rman.h>
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#include <isa/isareg.h>
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#include <isa/isavar.h>
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#include <isa/isa_common.h>
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#include <alpha/isa/isavar.h>
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#include <machine/intr.h>
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#include <machine/intrcnt.h>
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#include <machine/resource.h>
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static struct rman isa_irq_rman;
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static struct rman isa_drq_rman;
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static void
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isa_intr_enable(int irq)
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{
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int s = splhigh();
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if (irq < 8)
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outb(IO_ICU1+1, inb(IO_ICU1+1) & ~(1 << irq));
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else
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outb(IO_ICU2+1, inb(IO_ICU2+1) & ~(1 << (irq - 8)));
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splx(s);
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}
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static void
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isa_intr_disable(int irq)
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{
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int s = splhigh();
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if (irq < 8)
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outb(IO_ICU1+1, inb(IO_ICU1+1) | (1 << irq));
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else
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outb(IO_ICU2+1, inb(IO_ICU2+1) | (1 << (irq - 8)));
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splx(s);
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}
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intrmask_t
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isa_irq_pending(void)
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{
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u_char irr1;
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u_char irr2;
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irr1 = inb(IO_ICU1);
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irr2 = inb(IO_ICU2);
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return ((irr2 << 8) | irr1);
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}
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intrmask_t
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isa_irq_mask(void)
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{
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u_char irr1;
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u_char irr2;
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irr1 = inb(IO_ICU1+1);
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irr2 = inb(IO_ICU2+1);
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return ((irr2 << 8) | irr1);
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}
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void
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isa_init(void)
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{
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isa_init_intr();
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}
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void
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isa_init_intr(void)
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{
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static int initted = 0;
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if (initted) return;
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initted = 1;
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isa_irq_rman.rm_start = 0;
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isa_irq_rman.rm_end = 15;
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isa_irq_rman.rm_type = RMAN_ARRAY;
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isa_irq_rman.rm_descr = "ISA Interrupt request lines";
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if (rman_init(&isa_irq_rman)
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|| rman_manage_region(&isa_irq_rman, 0, 1)
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|| rman_manage_region(&isa_irq_rman, 3, 15))
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panic("isa_probe isa_irq_rman");
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isa_drq_rman.rm_start = 0;
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isa_drq_rman.rm_end = 7;
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isa_drq_rman.rm_type = RMAN_ARRAY;
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isa_drq_rman.rm_descr = "ISA DMA request lines";
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if (rman_init(&isa_drq_rman)
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|| rman_manage_region(&isa_drq_rman, 0, 7))
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panic("isa_probe isa_drq_rman");
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/* mask all isa interrupts */
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outb(IO_ICU1+1, 0xff);
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outb(IO_ICU2+1, 0xff);
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/* make sure chaining irq is enabled */
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isa_intr_enable(2);
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}
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struct resource *
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isa_alloc_intr(device_t bus, device_t child, int irq)
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{
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return rman_reserve_resource(&isa_irq_rman, irq, irq, 1,
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0, child);
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}
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int
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isa_release_intr(device_t bus, device_t child, struct resource *r)
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{
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return rman_release_resource(r);
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}
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/*
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* This implementation simply passes the request up to the parent
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* bus, which in our case is the pci chipset device, substituting any
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* configured values if the caller defaulted. We can get away with
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* this because there is no special mapping for ISA resources on this
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* platform. When porting this code to another architecture, it may be
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* necessary to interpose a mapping layer here.
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*
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* We manage our own interrupt resources since ISA interrupts go through
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* the ISA PIC, not the PCI interrupt controller.
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*/
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struct resource *
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isa_alloc_resource(device_t bus, device_t child, int type, int *rid,
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u_long start, u_long end, u_long count, u_int flags)
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{
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/*
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* Consider adding a resource definition. We allow rid 0-1 for
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* irq and drq, 0-3 for memory and 0-7 for ports which is
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* sufficient for isapnp.
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*/
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int passthrough = (device_get_parent(child) != bus);
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int isdefault = (start == 0UL && end == ~0UL);
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struct resource_list *rl;
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struct resource_list_entry *rle;
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struct resource *res;
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if (!passthrough && !isdefault) {
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rl = device_get_ivars(child);
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rle = resource_list_find(rl, type, *rid);
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if (!rle) {
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if (*rid < 0)
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return 0;
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if (type == SYS_RES_IRQ && *rid > 1)
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return 0;
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if (type == SYS_RES_DRQ && *rid > 1)
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return 0;
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if (type != SYS_RES_MEMORY && *rid > 3)
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return 0;
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if (type == SYS_RES_IOPORT && *rid > 7)
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return 0;
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resource_list_add(rl, type, *rid, start, end, count);
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}
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}
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if (type != SYS_RES_IRQ && type != SYS_RES_DRQ)
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return resource_list_alloc(bus, child, type, rid,
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start, end, count, flags);
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if (!passthrough) {
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rl = device_get_ivars(child);
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rle = resource_list_find(rl, type, *rid);
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if (!rle)
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return 0;
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if (rle->res)
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panic("isa_alloc_resource: resource entry is busy");
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if (isdefault) {
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start = end = rle->start;
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count = 1;
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}
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}
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if (type == SYS_RES_IRQ)
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res = rman_reserve_resource(&isa_irq_rman, start, start, 1,
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0, child);
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else
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res = rman_reserve_resource(&isa_drq_rman, start, start, 1,
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0, child);
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if (res && !passthrough) {
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rl = device_get_ivars(child);
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rle = resource_list_find(rl, type, *rid);
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rle->start = rman_get_start(res);
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rle->end = rman_get_end(res);
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rle->count = 1;
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rle->res = res;
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}
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return res;
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}
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int
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isa_release_resource(device_t bus, device_t child, int type, int rid,
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struct resource *res)
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{
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int passthrough = (device_get_parent(child) != bus);
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struct resource_list *rl;
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struct resource_list_entry *rle;
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int error;
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if (type != SYS_RES_IRQ)
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return resource_list_release(bus, child, type, rid, res);
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error = rman_release_resource(res);
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if (!passthrough && !error) {
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rl = device_get_ivars(child);
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rle = resource_list_find(rl, SYS_RES_IRQ, rid);
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if (rle)
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rle->res = NULL;
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else
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error = ENOENT;
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}
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return error;
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}
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struct isa_intr {
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void *ih;
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driver_intr_t *intr;
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void *arg;
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int irq;
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};
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/*
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* Wrap ISA interrupt routines so that we can feed non-specific
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* EOI to the PICs.
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*/
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static void
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isa_handle_intr(void *arg)
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{
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struct isa_intr *ii = arg;
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int irq = ii->irq;
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ii->intr(ii->arg);
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if (ii->irq > 7)
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outb(IO_ICU2, 0x20 | (irq & 7));
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outb(IO_ICU1, 0x20 | (irq > 7 ? 2 : irq));
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}
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int
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isa_setup_intr(device_t dev, device_t child,
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struct resource *irq, int flags,
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driver_intr_t *intr, void *arg, void **cookiep)
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{
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struct isa_intr *ii;
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int error;
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error = rman_activate_resource(irq);
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if (error)
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return error;
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ii = malloc(sizeof(struct isa_intr), M_DEVBUF, M_NOWAIT);
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if (!ii)
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return ENOMEM;
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ii->intr = intr;
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ii->arg = arg;
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ii->irq = irq->r_start;
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error = alpha_setup_intr(0x800 + (irq->r_start << 4),
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isa_handle_intr, ii, &ii->ih,
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&intrcnt[INTRCNT_ISA_IRQ + irq->r_start]);
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if (error) {
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free(ii, M_DEVBUF);
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return error;
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}
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isa_intr_enable(irq->r_start);
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*cookiep = ii;
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if (child)
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device_printf(child, "interrupting at ISA irq %d\n",
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(int)irq->r_start);
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return 0;
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}
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int
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isa_teardown_intr(device_t dev, device_t child,
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struct resource *irq, void *cookie)
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{
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struct isa_intr *ii = cookie;
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alpha_teardown_intr(ii->ih);
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isa_intr_disable(irq->r_start);
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return 0;
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}
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