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FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //sys/mips/mips/nexus.c |
/*-
* 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.
*
*/
/*
* This code implements a `root nexus' for MIPS 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 and memory address space.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/mips/mips/nexus.c 221218 2011-04-29 18:41:21Z jhb $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/rman.h>
#include <sys/interrupt.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/bus.h>
#include <machine/intr_machdep.h>
#include <machine/pmap.h>
#include <machine/resource.h>
#include <machine/vmparam.h>
#undef NEXUS_DEBUG
#ifdef NEXUS_DEBUG
#define dprintf printf
#else
#define dprintf(x, arg...)
#endif /* NEXUS_DEBUG */
static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
struct nexus_device {
struct resource_list nx_resources;
};
#define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
#define NUM_MIPS_IRQS 6
static struct rman irq_rman;
static struct rman mem_rman;
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 device_t nexus_add_child(device_t, u_int, const char *, int);
static int nexus_attach(device_t);
static int nexus_deactivate_resource(device_t, device_t, int, int,
struct resource *);
static void nexus_delete_resource(device_t, device_t, int, int);
static struct resource_list *
nexus_get_reslist(device_t, device_t);
static int nexus_get_resource(device_t, device_t, int, int, u_long *,
u_long *);
static void nexus_hinted_child(device_t, const char *, int);
static int nexus_print_child(device_t, device_t);
static int nexus_print_all_resources(device_t dev);
static int nexus_probe(device_t);
static int nexus_release_resource(device_t, device_t, int, int,
struct resource *);
static int nexus_set_resource(device_t, device_t, int, int, u_long,
u_long);
static int nexus_setup_intr(device_t dev, device_t child,
struct resource *res, int flags, driver_filter_t *filt,
driver_intr_t *intr, void *arg, void **cookiep);
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),
/* Bus interface */
DEVMETHOD(bus_add_child, nexus_add_child),
DEVMETHOD(bus_activate_resource,nexus_activate_resource),
DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
DEVMETHOD(bus_delete_resource, nexus_delete_resource),
DEVMETHOD(bus_get_resource, nexus_get_resource),
DEVMETHOD(bus_get_resource_list, nexus_get_reslist),
DEVMETHOD(bus_hinted_child, nexus_hinted_child),
DEVMETHOD(bus_print_child, nexus_print_child),
DEVMETHOD(bus_release_resource, nexus_release_resource),
DEVMETHOD(bus_set_resource, nexus_set_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;
static int
nexus_probe(device_t dev)
{
device_set_desc(dev, "MIPS32 root nexus");
irq_rman.rm_start = 0;
irq_rman.rm_end = NUM_MIPS_IRQS - 1;
irq_rman.rm_type = RMAN_ARRAY;
irq_rman.rm_descr = "Hardware IRQs";
if (rman_init(&irq_rman) != 0 ||
rman_manage_region(&irq_rman, 0, NUM_MIPS_IRQS - 1) != 0) {
panic("%s: irq_rman", __func__);
}
mem_rman.rm_start = 0;
mem_rman.rm_end = ~0ul;
mem_rman.rm_type = RMAN_ARRAY;
mem_rman.rm_descr = "Memory addresses";
if (rman_init(&mem_rman) != 0 ||
rman_manage_region(&mem_rman, 0, ~0) != 0) {
panic("%s: mem_rman", __func__);
}
return (0);
}
static int
nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep)
{
register_t s;
int irq;
s = intr_disable();
irq = rman_get_start(res);
if (irq >= NUM_MIPS_IRQS) {
intr_restore(s);
return (0);
}
cpu_establish_hardintr(device_get_nameunit(child), filt, intr, arg,
irq, flags, cookiep);
intr_restore(s);
return (0);
}
static int
nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
{
printf("Unimplemented %s at %s:%d\n", __func__, __FILE__, __LINE__);
return (0);
}
static int
nexus_attach(device_t dev)
{
bus_generic_probe(dev);
bus_enumerate_hinted_children(dev);
bus_generic_attach(dev);
return (0);
}
static int
nexus_print_child(device_t bus, device_t child)
{
int retval = 0;
retval += bus_print_child_header(bus, child);
retval += nexus_print_all_resources(child);
if (device_get_flags(child))
retval += printf(" flags %#x", device_get_flags(child));
retval += printf(" on %s\n", device_get_nameunit(bus));
return (retval);
}
static int
nexus_print_all_resources(device_t dev)
{
struct nexus_device *ndev = DEVTONX(dev);
struct resource_list *rl = &ndev->nx_resources;
int retval = 0;
if (STAILQ_FIRST(rl))
retval += printf(" at");
retval += resource_list_print_type(rl, "mem", SYS_RES_MEMORY, "%#lx");
retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
return (retval);
}
static void
nexus_hinted_child(device_t bus, const char *dname, int dunit)
{
device_t child;
long maddr;
int msize;
int result;
int irq;
int mem_hints_count;
child = BUS_ADD_CHILD(bus, 0, dname, dunit);
if (child == NULL)
return;
/*
* Set hard-wired resources for hinted child using
* specific RIDs.
*/
mem_hints_count = 0;
if (resource_long_value(dname, dunit, "maddr", &maddr) == 0)
mem_hints_count++;
if (resource_int_value(dname, dunit, "msize", &msize) == 0)
mem_hints_count++;
/* check if all info for mem resource has been provided */
if ((mem_hints_count > 0) && (mem_hints_count < 2)) {
printf("Either maddr or msize hint is missing for %s%d\n",
dname, dunit);
}
else if (mem_hints_count) {
dprintf("%s: discovered hinted child %s at maddr %p(%d)\n",
__func__, device_get_nameunit(child),
(void *)(intptr_t)maddr, msize);
result = bus_set_resource(child, SYS_RES_MEMORY, 0, maddr,
msize);
if (result != 0) {
device_printf(bus,
"warning: bus_set_resource() failed\n");
}
}
if (resource_int_value(dname, dunit, "irq", &irq) == 0) {
result = bus_set_resource(child, SYS_RES_IRQ, 0, irq, 1);
if (result != 0)
device_printf(bus,
"warning: bus_set_resource() failed\n");
}
}
static device_t
nexus_add_child(device_t bus, u_int order, const char *name, int unit)
{
device_t child;
struct nexus_device *ndev;
ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
if (!ndev)
return (0);
resource_list_init(&ndev->nx_resources);
child = device_add_child_ordered(bus, order, name, unit);
if (child == NULL) {
device_printf(bus, "failed to add child: %s%d\n", name, unit);
return (0);
}
/* should we free this in nexus_child_detached? */
device_set_ivars(child, ndev);
return (child);
}
/*
* 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 footbridge.)
*/
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 nexus_device *ndev = DEVTONX(child);
struct resource *rv;
struct resource_list_entry *rle;
struct rman *rm;
int isdefault, needactivate, passthrough;
dprintf("%s: entry (%p, %p, %d, %p, %p, %p, %ld, %d)\n",
__func__, bus, child, type, rid, (void *)(intptr_t)start,
(void *)(intptr_t)end, count, flags);
dprintf("%s: requested rid is %d\n", __func__, *rid);
isdefault = (start == 0UL && end == ~0UL && count == 1);
needactivate = flags & RF_ACTIVE;
passthrough = (device_get_parent(child) != bus);
rle = NULL;
/*
* If this is an allocation of the "default" range for a given RID,
* and we know what the resources for this device are (ie. they aren't
* maintained by a child bus), then work out the start/end values.
*/
if (isdefault) {
rle = resource_list_find(&ndev->nx_resources, type, *rid);
if (rle == NULL)
return (NULL);
if (rle->res != NULL) {
panic("%s: resource entry is busy", __func__);
}
start = rle->start;
end = rle->end;
count = rle->count;
}
switch (type) {
case SYS_RES_IRQ:
rm = &irq_rman;
break;
case SYS_RES_MEMORY:
rm = &mem_rman;
break;
default:
printf("%s: unknown resource type %d\n", __func__, type);
return (0);
}
rv = rman_reserve_resource(rm, start, end, count, flags, child);
if (rv == 0) {
printf("%s: could not reserve resource for %s\n", __func__,
device_get_nameunit(child));
return (0);
}
rman_set_rid(rv, *rid);
if (needactivate) {
if (bus_activate_resource(child, type, *rid, rv)) {
printf("%s: could not activate resource\n", __func__);
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)
{
void *vaddr;
u_int32_t paddr, psize;
/*
* If this is a memory resource, track the direct mapping
* in the uncached MIPS KSEG1 segment.
*/
if (type == SYS_RES_MEMORY) {
paddr = rman_get_start(r);
psize = rman_get_size(r);
vaddr = pmap_mapdev(paddr, psize);
rman_set_virtual(r, vaddr);
rman_set_bustag(r, mips_bus_space_generic);
rman_set_bushandle(r, (bus_space_handle_t)(uintptr_t)vaddr);
}
return (rman_activate_resource(r));
}
static struct resource_list *
nexus_get_reslist(device_t dev, device_t child)
{
struct nexus_device *ndev = DEVTONX(child);
return (&ndev->nx_resources);
}
static int
nexus_set_resource(device_t dev, device_t child, int type, int rid,
u_long start, u_long count)
{
struct nexus_device *ndev = DEVTONX(child);
struct resource_list *rl = &ndev->nx_resources;
struct resource_list_entry *rle;
dprintf("%s: entry (%p, %p, %d, %d, %p, %ld)\n",
__func__, dev, child, type, rid, (void *)(intptr_t)start, count);
rle = resource_list_add(rl, type, rid, start, start + count - 1,
count);
if (rle == NULL)
return (ENXIO);
return (0);
}
static int
nexus_get_resource(device_t dev, device_t child, int type, int rid,
u_long *startp, u_long *countp)
{
struct nexus_device *ndev = DEVTONX(child);
struct resource_list *rl = &ndev->nx_resources;
struct resource_list_entry *rle;
rle = resource_list_find(rl, type, rid);
if (!rle)
return(ENOENT);
if (startp)
*startp = rle->start;
if (countp)
*countp = rle->count;
return (0);
}
static void
nexus_delete_resource(device_t dev, device_t child, int type, int rid)
{
struct nexus_device *ndev = DEVTONX(child);
struct resource_list *rl = &ndev->nx_resources;
dprintf("%s: entry\n", __func__);
resource_list_delete(rl, type, rid);
}
static int
nexus_release_resource(device_t bus, device_t child, int type, int rid,
struct resource *r)
{
dprintf("%s: entry\n", __func__);
if (rman_get_flags(r) & RF_ACTIVE) {
int error = bus_deactivate_resource(child, type, rid, r);
if (error)
return error;
}
return (rman_release_resource(r));
}
static int
nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
struct resource *r)
{
vm_offset_t va;
if (type == SYS_RES_MEMORY) {
va = (vm_offset_t)rman_get_virtual(r);
pmap_unmapdev(va, rman_get_size(r));
}
return (rman_deactivate_resource(r));
}
DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);