freebsd-dev/sys/mips/sibyte/sb_zbbus.c
Andriy Gapon 3d844eddb7 bus_add_child: change type of order parameter to u_int
This reflects actual type used to store and compare child device orders.
Change is mostly done via a Coccinelle (soon to be devel/coccinelle)
semantic patch.
Verified by LINT+modules kernel builds.

Followup to:	r212213
MFC after:	10 days
2010-09-10 11:19:03 +00:00

463 lines
12 KiB
C

/*-
* Copyright (c) 2009 Neelkanth Natu
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/malloc.h>
#include <sys/rman.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <machine/resource.h>
#include <machine/intr_machdep.h>
#include "sb_scd.h"
static MALLOC_DEFINE(M_INTMAP, "sb1250 intmap", "Sibyte 1250 Interrupt Mapper");
static struct mtx zbbus_intr_mtx;
MTX_SYSINIT(zbbus_intr_mtx, &zbbus_intr_mtx, "zbbus_intr_mask/unmask lock",
MTX_SPIN);
/*
* This array holds the mapping between a MIPS hard interrupt and the
* interrupt sources that feed into that it.
*/
static uint64_t hardint_to_intsrc_mask[NHARD_IRQS];
struct sb_intmap {
int intsrc; /* interrupt mapper register number (0 - 63) */
int hardint; /* cpu interrupt from 0 to NHARD_IRQS - 1 */
/*
* The device that the interrupt belongs to. Note that multiple
* devices may share an interrupt. For e.g. PCI_INT_x lines.
*
* The device 'dev' in combination with the 'rid' uniquely
* identify this interrupt source.
*/
device_t dev;
int rid;
SLIST_ENTRY(sb_intmap) next;
};
static SLIST_HEAD(, sb_intmap) sb_intmap_head;
static struct sb_intmap *
sb_intmap_lookup(int intrnum, device_t dev, int rid)
{
struct sb_intmap *map;
SLIST_FOREACH(map, &sb_intmap_head, next) {
if (dev == map->dev && rid == map->rid &&
intrnum == map->hardint)
break;
}
return (map);
}
/*
* Keep track of which (dev,rid,hardint) tuple is using the interrupt source.
*
* We don't actually unmask the interrupt source until the device calls
* a bus_setup_intr() on the resource.
*/
static void
sb_intmap_add(int intrnum, device_t dev, int rid, int intsrc)
{
struct sb_intmap *map;
KASSERT(intrnum >= 0 && intrnum < NHARD_IRQS,
("intrnum is out of range: %d", intrnum));
map = sb_intmap_lookup(intrnum, dev, rid);
if (map) {
KASSERT(intsrc == map->intsrc,
("%s%d allocating SYS_RES_IRQ resource with rid %d "
"with a different intsrc (%d versus %d)",
device_get_name(dev), device_get_unit(dev), rid,
intsrc, map->intsrc));
return;
}
map = malloc(sizeof(*map), M_INTMAP, M_WAITOK | M_ZERO);
map->intsrc = intsrc;
map->hardint = intrnum;
map->dev = dev;
map->rid = rid;
SLIST_INSERT_HEAD(&sb_intmap_head, map, next);
}
static void
sb_intmap_activate(int intrnum, device_t dev, int rid)
{
struct sb_intmap *map;
KASSERT(intrnum >= 0 && intrnum < NHARD_IRQS,
("intrnum is out of range: %d", intrnum));
map = sb_intmap_lookup(intrnum, dev, rid);
if (map) {
/*
* Deliver all interrupts to CPU0.
*/
mtx_lock_spin(&zbbus_intr_mtx);
hardint_to_intsrc_mask[intrnum] |= 1ULL << map->intsrc;
sb_enable_intsrc(0, map->intsrc);
mtx_unlock_spin(&zbbus_intr_mtx);
} else {
/*
* In zbbus_setup_intr() we blindly call sb_intmap_activate()
* for every interrupt activation that comes our way.
*
* We might end up here if we did not "hijack" the SYS_RES_IRQ
* resource in zbbus_alloc_resource().
*/
printf("sb_intmap_activate: unable to activate interrupt %d "
"for device %s%d rid %d.\n", intrnum,
device_get_name(dev), device_get_unit(dev), rid);
}
}
/*
* Replace the default interrupt mask and unmask routines in intr_machdep.c
* with routines that are SMP-friendly. In contrast to the default mask/unmask
* routines in intr_machdep.c these routines do not change the SR.int_mask bits.
*
* Instead they use the interrupt mapper to either mask or unmask all
* interrupt sources feeding into a particular interrupt line of the processor.
*
* This means that these routines have an identical effect irrespective of
* which cpu is executing them. This is important because the ithread may
* be scheduled to run on either of the cpus.
*/
static void
zbbus_intr_mask(void *arg)
{
uint64_t mask;
int irq;
irq = (uintptr_t)arg;
mtx_lock_spin(&zbbus_intr_mtx);
mask = sb_read_intsrc_mask(0);
mask |= hardint_to_intsrc_mask[irq];
sb_write_intsrc_mask(0, mask);
mtx_unlock_spin(&zbbus_intr_mtx);
}
static void
zbbus_intr_unmask(void *arg)
{
uint64_t mask;
int irq;
irq = (uintptr_t)arg;
mtx_lock_spin(&zbbus_intr_mtx);
mask = sb_read_intsrc_mask(0);
mask &= ~hardint_to_intsrc_mask[irq];
sb_write_intsrc_mask(0, mask);
mtx_unlock_spin(&zbbus_intr_mtx);
}
struct zbbus_devinfo {
struct resource_list resources;
};
static MALLOC_DEFINE(M_ZBBUSDEV, "zbbusdev", "zbbusdev");
static int
zbbus_probe(device_t dev)
{
device_set_desc(dev, "Broadcom/Sibyte ZBbus");
return (0);
}
static int
zbbus_attach(device_t dev)
{
if (bootverbose) {
device_printf(dev, "attached.\n");
}
cpu_set_hardintr_mask_func(zbbus_intr_mask);
cpu_set_hardintr_unmask_func(zbbus_intr_unmask);
bus_generic_probe(dev);
bus_enumerate_hinted_children(dev);
bus_generic_attach(dev);
return (0);
}
static void
zbbus_hinted_child(device_t bus, const char *dname, int dunit)
{
device_t child;
long maddr, msize;
int err, irq;
if (resource_disabled(dname, dunit))
return;
child = BUS_ADD_CHILD(bus, 0, dname, dunit);
if (child == NULL) {
panic("zbbus: could not add child %s unit %d\n", dname, dunit);
}
if (bootverbose)
device_printf(bus, "Adding hinted child %s%d\n", dname, dunit);
/*
* Assign any pre-defined resources to the child.
*/
if (resource_long_value(dname, dunit, "msize", &msize) == 0 &&
resource_long_value(dname, dunit, "maddr", &maddr) == 0) {
if (bootverbose) {
device_printf(bus, "Assigning memory resource "
"0x%0lx/%ld to child %s%d\n",
maddr, msize, dname, dunit);
}
err = bus_set_resource(child, SYS_RES_MEMORY, 0, maddr, msize);
if (err) {
device_printf(bus, "Unable to set memory resource "
"0x%0lx/%ld for child %s%d: %d\n",
maddr, msize, dname, dunit, err);
}
}
if (resource_int_value(dname, dunit, "irq", &irq) == 0) {
if (bootverbose) {
device_printf(bus, "Assigning irq resource %d to "
"child %s%d\n", irq, dname, dunit);
}
err = bus_set_resource(child, SYS_RES_IRQ, 0, irq, 1);
if (err) {
device_printf(bus, "Unable to set irq resource %d"
"for child %s%d: %d\n",
irq, dname, dunit, err);
}
}
}
static struct resource *
zbbus_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 *res;
int intrnum, intsrc, isdefault;
struct resource_list *rl;
struct resource_list_entry *rle;
struct zbbus_devinfo *dinfo;
isdefault = (start == 0UL && end == ~0UL && count == 1);
/*
* Our direct child is asking for a default resource allocation.
*/
if (device_get_parent(child) == bus) {
dinfo = device_get_ivars(child);
rl = &dinfo->resources;
rle = resource_list_find(rl, type, *rid);
if (rle) {
if (rle->res)
panic("zbbus_alloc_resource: resource is busy");
if (isdefault) {
start = rle->start;
count = ulmax(count, rle->count);
end = ulmax(rle->end, start + count - 1);
}
} else {
if (isdefault) {
/*
* Our child is requesting a default
* resource allocation but we don't have the
* 'type/rid' tuple in the resource list.
*
* We have to fail the resource allocation.
*/
return (NULL);
} else {
/*
* The child is requesting a non-default
* resource. We just pass the request up
* to our parent. If the resource allocation
* succeeds we will create a resource list
* entry corresponding to that resource.
*/
}
}
} else {
rl = NULL;
rle = NULL;
}
/*
* nexus doesn't know about the interrupt mapper and only wants to
* see the hard irq numbers [0-6]. We translate from the interrupt
* source presented to the mapper to the interrupt number presented
* to the cpu.
*/
if ((count == 1) && (type == SYS_RES_IRQ)) {
intsrc = start;
intrnum = sb_route_intsrc(intsrc);
start = end = intrnum;
} else {
intsrc = -1; /* satisfy gcc */
intrnum = -1;
}
res = bus_generic_alloc_resource(bus, child, type, rid,
start, end, count, flags);
/*
* Keep track of the input into the interrupt mapper that maps
* to the resource allocated by 'child' with resource id 'rid'.
*
* If we don't record the mapping here then we won't be able to
* locate the interrupt source when bus_setup_intr(child,rid) is
* called.
*/
if (res != NULL && intrnum != -1)
sb_intmap_add(intrnum, child, rman_get_rid(res), intsrc);
/*
* If a non-default resource allocation by our child was successful
* then keep track of the resource in the resource list associated
* with the child.
*/
if (res != NULL && rle == NULL && device_get_parent(child) == bus) {
resource_list_add(rl, type, *rid, start, end, count);
rle = resource_list_find(rl, type, *rid);
if (rle == NULL)
panic("zbbus_alloc_resource: cannot find resource");
}
if (rle != NULL) {
KASSERT(device_get_parent(child) == bus,
("rle should be NULL for passthru device"));
rle->res = res;
if (rle->res) {
rle->start = rman_get_start(rle->res);
rle->end = rman_get_end(rle->res);
rle->count = count;
}
}
return (res);
}
static int
zbbus_setup_intr(device_t dev, device_t child, struct resource *irq, int flags,
driver_filter_t *filter, driver_intr_t *intr, void *arg,
void **cookiep)
{
int error;
error = bus_generic_setup_intr(dev, child, irq, flags,
filter, intr, arg, cookiep);
if (error == 0)
sb_intmap_activate(rman_get_start(irq), child,
rman_get_rid(irq));
return (error);
}
static device_t
zbbus_add_child(device_t bus, u_int order, const char *name, int unit)
{
device_t child;
struct zbbus_devinfo *dinfo;
child = device_add_child_ordered(bus, order, name, unit);
if (child != NULL) {
dinfo = malloc(sizeof(struct zbbus_devinfo), M_ZBBUSDEV,
M_WAITOK | M_ZERO);
resource_list_init(&dinfo->resources);
device_set_ivars(child, dinfo);
}
return (child);
}
static struct resource_list *
zbbus_get_resource_list(device_t dev, device_t child)
{
struct zbbus_devinfo *dinfo = device_get_ivars(child);
return (&dinfo->resources);
}
static device_method_t zbbus_methods[] ={
/* Device interface */
DEVMETHOD(device_probe, zbbus_probe),
DEVMETHOD(device_attach, zbbus_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_alloc_resource, zbbus_alloc_resource),
DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
DEVMETHOD(bus_release_resource, bus_generic_release_resource),
DEVMETHOD(bus_get_resource_list,zbbus_get_resource_list),
DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource),
DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource),
DEVMETHOD(bus_delete_resource, bus_generic_rl_delete_resource),
DEVMETHOD(bus_setup_intr, zbbus_setup_intr),
DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
DEVMETHOD(bus_add_child, zbbus_add_child),
DEVMETHOD(bus_hinted_child, zbbus_hinted_child),
{ 0, 0 }
};
static driver_t zbbus_driver = {
"zbbus",
zbbus_methods
};
static devclass_t zbbus_devclass;
DRIVER_MODULE(zbbus, nexus, zbbus_driver, zbbus_devclass, 0, 0);