freebsd-skq/sys/alpha/isa/isa.c
Andrew Gallatin 9720c4f309 Style(9) a comment added in previous commit.
Pointed out by: bde
2003-04-11 13:30:32 +00:00

420 lines
9.6 KiB
C

/*-
* Copyright (c) 1998 Doug Rabson
* All rights reserved.
*
* 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 AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/rman.h>
#include <sys/interrupt.h>
#include <isa/isareg.h>
#include <isa/isavar.h>
#include <isa/isa_common.h>
#include <alpha/isa/isavar.h>
#include <machine/intr.h>
#include <machine/intrcnt.h>
#include <machine/resource.h>
#include <machine/cpuconf.h>
static struct rman isa_irq_rman;
static struct rman isa_drq_rman;
static void
isa_intr_enable(int irq)
{
if (irq < 8)
outb(IO_ICU1+1, inb(IO_ICU1+1) & ~(1 << irq));
else
outb(IO_ICU2+1, inb(IO_ICU2+1) & ~(1 << (irq - 8)));
}
static void
isa_intr_disable(int irq)
{
if (irq < 8)
outb(IO_ICU1+1, inb(IO_ICU1+1) | (1 << irq));
else
outb(IO_ICU2+1, inb(IO_ICU2+1) | (1 << (irq - 8)));
}
intrmask_t
isa_irq_pending(void)
{
u_char irr1;
u_char irr2;
irr1 = inb(IO_ICU1);
irr2 = inb(IO_ICU2);
return ((irr2 << 8) | irr1);
}
intrmask_t
isa_irq_mask(void)
{
u_char irr1;
u_char irr2;
irr1 = inb(IO_ICU1+1);
irr2 = inb(IO_ICU2+1);
return ((irr2 << 8) | irr1);
}
void
isa_init(device_t dev)
{
isa_init_intr();
}
void
isa_init_intr(void)
{
static int initted = 0;
if (initted) return;
initted = 1;
isa_irq_rman.rm_start = 0;
isa_irq_rman.rm_end = 15;
isa_irq_rman.rm_type = RMAN_ARRAY;
isa_irq_rman.rm_descr = "ISA Interrupt request lines";
if (rman_init(&isa_irq_rman)
|| rman_manage_region(&isa_irq_rman, 0, 1)
|| rman_manage_region(&isa_irq_rman, 3, 15))
panic("isa_probe isa_irq_rman");
isa_drq_rman.rm_start = 0;
isa_drq_rman.rm_end = 7;
isa_drq_rman.rm_type = RMAN_ARRAY;
isa_drq_rman.rm_descr = "ISA DMA request lines";
if (rman_init(&isa_drq_rman)
|| rman_manage_region(&isa_drq_rman, 0, 7))
panic("isa_probe isa_drq_rman");
/* mask all isa interrupts */
outb(IO_ICU1+1, 0xff);
outb(IO_ICU2+1, 0xff);
/* make sure chaining irq is enabled */
isa_intr_enable(2);
}
struct resource *
isa_alloc_intr(device_t bus, device_t child, int irq)
{
return rman_reserve_resource(&isa_irq_rman, irq, irq, 1,
0, child);
}
struct resource *
isa_alloc_intrs(device_t bus, device_t child, u_long start, u_long end)
{
return rman_reserve_resource(&isa_irq_rman, start, end,
end - start + 1, 0, child);
}
int
isa_release_intr(device_t bus, device_t child, struct resource *r)
{
return rman_release_resource(r);
}
/*
* This implementation simply passes the request up to the parent
* bus, which in our case is the pci chipset device, substituting any
* configured values if the caller defaulted. We can get away with
* this because there is no special mapping for ISA resources on this
* platform. When porting this code to another architecture, it may be
* necessary to interpose a mapping layer here.
*
* We manage our own interrupt resources since ISA interrupts go through
* the ISA PIC, not the PCI interrupt controller.
*/
struct resource *
isa_alloc_resource(device_t bus, device_t child, int type, int *rid,
u_long start, u_long end, u_long count, u_int flags)
{
/*
* Consider adding a resource definition. We allow rid 0-1 for
* irq and drq, 0-3 for memory and 0-7 for ports which is
* sufficient for isapnp.
*/
int passthrough = (device_get_parent(child) != bus);
int isdefault = (start == 0UL && end == ~0UL);
struct isa_device* idev = DEVTOISA(child);
struct resource_list *rl = &idev->id_resources;
struct resource_list_entry *rle;
struct resource *res;
if (!passthrough && !isdefault) {
rle = resource_list_find(rl, type, *rid);
if (!rle) {
if (*rid < 0)
return 0;
switch (type) {
case SYS_RES_IRQ:
if (*rid >= ISA_NIRQ)
return 0;
break;
case SYS_RES_DRQ:
if (*rid >= ISA_NDRQ)
return 0;
break;
case SYS_RES_MEMORY:
if (*rid >= ISA_NMEM)
return 0;
break;
case SYS_RES_IOPORT:
if (*rid >= ISA_NPORT)
return 0;
break;
default:
return 0;
}
resource_list_add(rl, type, *rid, start, end, count);
}
}
if (type != SYS_RES_IRQ && type != SYS_RES_DRQ)
return resource_list_alloc(rl, bus, child, type, rid,
start, end, count, flags);
if (!passthrough) {
rl = device_get_ivars(child);
rle = resource_list_find(rl, type, *rid);
if (!rle)
return 0;
if (rle->res)
panic("isa_alloc_resource: resource entry is busy");
if (isdefault) {
start = end = rle->start;
count = 1;
}
}
if (type == SYS_RES_IRQ)
res = rman_reserve_resource(&isa_irq_rman, start, start, 1,
0, child);
else
res = rman_reserve_resource(&isa_drq_rman, start, start, 1,
0, child);
if (res && !passthrough) {
rle = resource_list_find(rl, type, *rid);
rle->start = rman_get_start(res);
rle->end = rman_get_end(res);
rle->count = 1;
rle->res = res;
}
return res;
}
int
isa_release_resource(device_t bus, device_t child, int type, int rid,
struct resource *res)
{
int passthrough = (device_get_parent(child) != bus);
struct isa_device* idev = DEVTOISA(child);
struct resource_list *rl = &idev->id_resources;
struct resource_list_entry *rle;
int error;
if (type != SYS_RES_IRQ)
return resource_list_release(rl, bus, child, type, rid, res);
error = rman_release_resource(res);
if (!passthrough && !error) {
rle = resource_list_find(rl, SYS_RES_IRQ, rid);
if (rle)
rle->res = NULL;
else
error = ENOENT;
}
return error;
}
struct isa_intr {
void *ih;
driver_intr_t *intr;
void *arg;
int irq;
};
/*
* Wrap ISA interrupt routines so that we can feed non-specific
* EOI to the PICs.
*/
static void
isa_handle_fast_intr(void *arg)
{
struct isa_intr *ii = arg;
int irq = ii->irq;
ii->intr(ii->arg);
mtx_lock_spin(&icu_lock);
if (irq > 7)
outb(IO_ICU2, 0x20 | (irq & 7));
outb(IO_ICU1, 0x20 | (irq > 7 ? 2 : irq));
mtx_unlock_spin(&icu_lock);
}
static void
isa_handle_intr(void *arg)
{
struct isa_intr *ii = arg;
ii->intr(ii->arg);
}
/*
* Send a non-specific EIO early, then disable the source
*/
static void
isa_disable_intr(int vector)
{
int irq = (vector - 0x800) >> 4;
mtx_lock_spin(&icu_lock);
if (irq > 7)
outb(IO_ICU2, 0x20 | (irq & 7));
outb(IO_ICU1, 0x20 | (irq > 7 ? 2 : irq));
isa_intr_disable(irq);
mtx_unlock_spin(&icu_lock);
}
static void
isa_enable_intr(int vector)
{
int irq;
irq = (vector - 0x800) >> 4;
mtx_lock_spin(&icu_lock);
isa_intr_enable(irq);
mtx_unlock_spin(&icu_lock);
}
int
isa_setup_intr(device_t dev, device_t child,
struct resource *irq, int flags,
driver_intr_t *intr, void *arg, void **cookiep)
{
struct isa_intr *ii;
int error;
if (platform.isa_setup_intr)
return platform.isa_setup_intr(dev, child, irq, flags,
intr, arg, cookiep);
if (irq == NULL)
return ENODEV;
error = rman_activate_resource(irq);
if (error)
return error;
ii = malloc(sizeof(struct isa_intr), M_DEVBUF, M_NOWAIT);
if (!ii)
return ENOMEM;
ii->intr = intr;
ii->arg = arg;
ii->irq = irq->r_start;
error = alpha_setup_intr(
device_get_nameunit(child ? child : dev),
0x800 + (irq->r_start << 4),
((flags & INTR_FAST) ? isa_handle_fast_intr :
isa_handle_intr), ii, flags, &ii->ih,
&intrcnt[INTRCNT_ISA_IRQ + irq->r_start],
isa_disable_intr, isa_enable_intr);
if (error) {
free(ii, M_DEVBUF);
return error;
}
mtx_lock_spin(&icu_lock);
isa_intr_enable(irq->r_start);
mtx_unlock_spin(&icu_lock);
*cookiep = ii;
if (child)
device_printf(child, "interrupting at ISA irq %d\n",
(int)irq->r_start);
return 0;
}
int
isa_teardown_intr(device_t dev, device_t child,
struct resource *irq, void *cookie)
{
struct isa_intr *ii = cookie;
struct intrhand *ih, *handler = (struct intrhand *)ii->ih;
struct ithd *ithread = handler->ih_ithread;
int num_handlers = 0;
mtx_lock(&ithread->it_lock);
TAILQ_FOREACH(ih, &ithread->it_handlers, ih_next)
num_handlers++;
mtx_unlock(&ithread->it_lock);
/*
* Only disable the interrupt in hardware if there are no
* other handlers sharing it.
*/
if (num_handlers == 1) {
mtx_lock_spin(&icu_lock);
isa_intr_disable(irq->r_start);
mtx_unlock_spin(&icu_lock);
if (platform.isa_teardown_intr) {
platform.isa_teardown_intr(dev, child, irq,
cookie);
return 0;
}
}
alpha_teardown_intr(ii->ih);
return 0;
}