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/*
* Copyright 1998 Massachusetts Institute of Technology
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby
* granted, provided that both the above copyright notice and this
* permission notice appear in all copies, that both the above
* copyright notice and this permission notice appear in all
* supporting documentation, and that the name of M.I.T. not be used
* in advertising or publicity pertaining to distribution of the
* software without specific, written prior permission. M.I.T. makes
* no representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied
* warranty.
*
* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
* SHALL M.I.T. 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.
*
* $Id: nexus.c,v 1.14 1999/08/22 19:56:55 peter Exp $
*/
/*
* This code implements a `root nexus' for Intel Architecture
* machines. The function of the root nexus is to serve as an
* attachment point for both processors and buses, and to manage
* resources which are common to all of them. In particular,
* this code implements the core resource managers for interrupt
* requests, DMA requests (which rightfully should be a part of the
* ISA code but it's easier to do it here for now), I/O port addresses,
* and I/O memory address space.
*/
#include "opt_smp.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/interrupt.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/vmparam.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/pmap.h>
#include <machine/ipl.h>
#include <machine/resource.h>
#ifdef APIC_IO
#include <machine/smp.h>
#include <machine/mpapic.h>
#endif
#ifdef PC98
#include <pc98/pc98/pc98.h>
#else
#include <i386/isa/isa.h>
#endif
#include <i386/isa/icu.h>
#include <i386/isa/intr_machdep.h>
static struct rman irq_rman, drq_rman, port_rman, mem_rman;
static int nexus_probe(device_t);
static int nexus_attach(device_t);
static int nexus_print_child(device_t, device_t);
static device_t nexus_add_child(device_t bus, int order, const char *name,
int unit);
static struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
u_long, u_long, u_long, u_int);
static int nexus_activate_resource(device_t, device_t, int, int,
struct resource *);
static int nexus_deactivate_resource(device_t, device_t, int, int,
struct resource *);
static int nexus_release_resource(device_t, device_t, int, int,
struct resource *);
static int nexus_setup_intr(device_t, device_t, struct resource *, int flags,
void (*)(void *), void *, void **);
static int nexus_teardown_intr(device_t, device_t, struct resource *,
void *);
static device_method_t nexus_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, nexus_probe),
DEVMETHOD(device_attach, nexus_attach),
DEVMETHOD(device_detach, bus_generic_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
/* Bus interface */
DEVMETHOD(bus_print_child, nexus_print_child),
DEVMETHOD(bus_add_child, nexus_add_child),
DEVMETHOD(bus_read_ivar, bus_generic_read_ivar),
DEVMETHOD(bus_write_ivar, bus_generic_write_ivar),
DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
DEVMETHOD(bus_release_resource, nexus_release_resource),
DEVMETHOD(bus_activate_resource, nexus_activate_resource),
DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
DEVMETHOD(bus_setup_intr, nexus_setup_intr),
DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
{ 0, 0 }
};
static driver_t nexus_driver = {
"nexus",
nexus_methods,
1, /* no softc */
};
static devclass_t nexus_devclass;
DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
#ifdef APIC_IO
#define LASTIRQ (NINTR - 1)
#else
#define LASTIRQ 15
#endif
static int
nexus_probe(device_t dev)
{
device_quiet(dev); /* suppress attach message for neatness */
/*
* IRQ's are on the mainboard on old systems, but on the ISA part
* of PCI->ISA bridges. There would be multiple sets of IRQs on
* multi-ISA-bus systems. PCI interrupts are routed to the ISA
* component, so in a way, PCI can be a partial child of an ISA bus(!).
* APIC interrupts are global though.
*/
irq_rman.rm_start = 0;
irq_rman.rm_end = LASTIRQ;
irq_rman.rm_type = RMAN_ARRAY;
irq_rman.rm_descr = "Interrupt request lines";
if (rman_init(&irq_rman)
|| rman_manage_region(&irq_rman, 0, 1)
|| rman_manage_region(&irq_rman, 3, LASTIRQ))
panic("nexus_probe irq_rman");
/*
* ISA DMA on PCI systems is implemented in the ISA part of each
* PCI->ISA bridge and the channels can be duplicated if there are
* multiple bridges. (eg: laptops with docking stations)
*/
drq_rman.rm_start = 0;
drq_rman.rm_end = 7;
drq_rman.rm_type = RMAN_ARRAY;
drq_rman.rm_descr = "DMA request lines";
/* XXX drq 0 not available on some machines */
if (rman_init(&drq_rman)
|| rman_manage_region(&drq_rman, 0, 7))
panic("nexus_probe drq_rman");
/*
* However, IO ports and Memory truely are global at this level,
* as are APIC interrupts (however many IO APICS there turn out
* to be on large systems..)
*/
port_rman.rm_start = 0;
port_rman.rm_end = 0xffff;
port_rman.rm_type = RMAN_ARRAY;
port_rman.rm_descr = "I/O ports";
if (rman_init(&port_rman)
|| rman_manage_region(&port_rman, 0, 0xffff))
panic("nexus_probe port_rman");
mem_rman.rm_start = 0;
mem_rman.rm_end = ~0u;
mem_rman.rm_type = RMAN_ARRAY;
mem_rman.rm_descr = "I/O memory addresses";
if (rman_init(&mem_rman)
|| rman_manage_region(&mem_rman, 0, ~0))
panic("nexus_probe mem_rman");
return bus_generic_probe(dev);
}
static int
nexus_attach(device_t dev)
{
device_t child;
/*
* First, deal with the children we know about already
*/
bus_generic_attach(dev);
/*
* And if we didn't see EISA or ISA on a pci bridge, create some
* connection points now so they show up "on motherboard".
*/
if (!devclass_get_device(devclass_find("eisa"), 0)) {
child = device_add_child(dev, "eisa", 0, 0);
if (child == NULL)
panic("nexus_attach eisa");
device_probe_and_attach(child);
}
if (!devclass_get_device(devclass_find("isa"), 0)) {
child = device_add_child(dev, "isa", 0, 0);
if (child == NULL)
panic("nexus_attach isa");
device_probe_and_attach(child);
}
return 0;
}
static int
nexus_print_child(device_t bus, device_t child)
{
int retval = 0;
retval += bus_print_child_header(bus, child);
retval += printf(" on motherboard\n");
return (retval);
}
static device_t
nexus_add_child(device_t bus, int order, const char *name, int unit)
{
return device_add_child_ordered(bus, order, name, unit, 0);
}
/*
* Allocate a resource on behalf of child. NB: child is usually going to be a
* child of one of our descendants, not a direct child of nexus0.
* (Exceptions include npx.)
*/
static struct resource *
nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
u_long start, u_long end, u_long count, u_int flags)
{
struct resource *rv;
struct rman *rm;
int needactivate = flags & RF_ACTIVE;
flags &= ~RF_ACTIVE;
switch (type) {
case SYS_RES_IRQ:
rm = &irq_rman;
break;
case SYS_RES_DRQ:
rm = &drq_rman;
break;
case SYS_RES_IOPORT:
rm = &port_rman;
break;
case SYS_RES_MEMORY:
rm = &mem_rman;
break;
default:
return 0;
}
rv = rman_reserve_resource(rm, start, end, count, flags, child);
if (rv == 0)
return 0;
if (type == SYS_RES_MEMORY) {
caddr_t vaddr = 0;
if (rv->r_end < 1024 * 1024) {
/*
* The first 1Mb is mapped at KERNBASE.
*/
vaddr = (caddr_t)((uintptr_t)KERNBASE + rv->r_start);
} else {
u_int32_t paddr;
u_int32_t psize;
u_int32_t poffs;
paddr = rv->r_start;
psize = rv->r_end - rv->r_start;
poffs = paddr - trunc_page(paddr);
vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs;
}
rman_set_virtual(rv, vaddr);
rman_set_bustag(rv, I386_BUS_SPACE_MEM);
rman_set_bushandle(rv, (bus_space_handle_t) vaddr);
} else if (type == SYS_RES_IOPORT) {
rman_set_bustag(rv, I386_BUS_SPACE_IO);
rman_set_bushandle(rv, rv->r_start);
}
if (needactivate) {
if (bus_activate_resource(child, type, *rid, rv)) {
rman_release_resource(rv);
return 0;
}
}
return rv;
}
static int
nexus_activate_resource(device_t bus, device_t child, int type, int rid,
struct resource *r)
{
return (rman_activate_resource(r));
}
static int
nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
struct resource *r)
{
return (rman_deactivate_resource(r));
}
static int
nexus_release_resource(device_t bus, device_t child, int type, int rid,
struct resource *r)
{
if (r->r_flags & RF_ACTIVE) {
int error = bus_deactivate_resource(child, type, rid, r);
if (error)
return error;
}
return (rman_release_resource(r));
}
/*
* Currently this uses the really grody interface from kern/kern_intr.c
* (which really doesn't belong in kern/anything.c). Eventually, all of
* the code in kern_intr.c and machdep_intr.c should get moved here, since
* this is going to be the official interface.
*/
static int
nexus_setup_intr(device_t bus, device_t child, struct resource *irq,
int flags, void (*ihand)(void *), void *arg, void **cookiep)
{
intrmask_t *mask;
driver_t *driver;
int error, icflags;
char name[32];
/* somebody tried to setup an irq that failed to allocate! */
if (irq == NULL)
panic("nexus_setup_intr: NULL irq resource!");
*cookiep = 0;
if (irq->r_flags & RF_SHAREABLE)
icflags = 0;
else
icflags = INTR_EXCL;
driver = device_get_driver(child);
switch (flags) {
case INTR_TYPE_TTY:
mask = &tty_imask;
break;
case (INTR_TYPE_TTY | INTR_TYPE_FAST):
mask = &tty_imask;
icflags |= INTR_FAST;
break;
case INTR_TYPE_BIO:
mask = &bio_imask;
break;
case INTR_TYPE_NET:
mask = &net_imask;
break;
case INTR_TYPE_CAM:
mask = &cam_imask;
break;
case INTR_TYPE_MISC:
mask = 0;
break;
default:
panic("still using grody create_intr interface");
}
/*
* We depend here on rman_activate_resource() being idempotent.
*/
error = rman_activate_resource(irq);
if (error)
return (error);
snprintf(name, sizeof(name), "%s%d", device_get_name(child),
device_get_unit(child));
*cookiep = inthand_add(name, irq->r_start, ihand, arg,
mask, icflags);
if (*cookiep == NULL)
error = EINVAL; /* XXX ??? */
return (error);
}
static int
nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
{
return (inthand_remove(ih));
}
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