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/*-
* Copyright (c) 2010 Juli Mallett <jmallett@FreeBSD.org>
* 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/cdefs.h>
__FBSDID("$FreeBSD$");
#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 <sys/rman.h>
#include <sys/malloc.h>
#include <sys/smp.h>
#include <machine/bus.h>
#include <machine/intr_machdep.h>
#include <contrib/octeon-sdk/cvmx.h>
#include <contrib/octeon-sdk/cvmx-interrupt.h>
/*
* This bus sits between devices/buses and nexus and handles CIU interrupts
* and passes everything else through. It should really be a nexus subclass
* or something, but for now this will be sufficient.
*/
#define CIU_IRQ_HARD (0)
#define CIU_IRQ_EN0_BEGIN CVMX_IRQ_WORKQ0
#define CIU_IRQ_EN0_END CVMX_IRQ_BOOTDMA
#define CIU_IRQ_EN0_COUNT ((CIU_IRQ_EN0_END - CIU_IRQ_EN0_BEGIN) + 1)
#define CIU_IRQ_EN1_BEGIN CVMX_IRQ_WDOG0
#define CIU_IRQ_EN1_END CVMX_IRQ_WDOG15
#define CIU_IRQ_EN1_COUNT ((CIU_IRQ_EN1_END - CIU_IRQ_EN1_BEGIN) + 1)
struct ciu_softc {
struct rman irq_rman;
struct resource *ciu_irq;
};
static mips_intrcnt_t ciu_en0_intrcnt[CIU_IRQ_EN0_COUNT];
static mips_intrcnt_t ciu_en1_intrcnt[CIU_IRQ_EN1_COUNT];
static struct intr_event *ciu_en0_intr_events[CIU_IRQ_EN0_COUNT];
static struct intr_event *ciu_en1_intr_events[CIU_IRQ_EN1_COUNT];
static int ciu_probe(device_t);
static int ciu_attach(device_t);
static struct resource *ciu_alloc_resource(device_t, device_t, int, int *,
u_long, u_long, u_long, u_int);
static int ciu_setup_intr(device_t, device_t, struct resource *,
int, driver_filter_t *, driver_intr_t *,
void *, void **);
static int ciu_teardown_intr(device_t, device_t,
struct resource *, void *);
static int ciu_bind_intr(device_t, device_t, struct resource *,
int);
static int ciu_describe_intr(device_t, device_t,
struct resource *, void *,
const char *);
static void ciu_hinted_child(device_t, const char *, int);
static void ciu_en0_intr_mask(void *);
static void ciu_en0_intr_unmask(void *);
#ifdef SMP
static int ciu_en0_intr_bind(void *, u_char);
#endif
static void ciu_en1_intr_mask(void *);
static void ciu_en1_intr_unmask(void *);
#ifdef SMP
static int ciu_en1_intr_bind(void *, u_char);
#endif
static int ciu_intr(void *);
static int
ciu_probe(device_t dev)
{
if (device_get_unit(dev) != 0)
return (ENXIO);
device_set_desc(dev, "Cavium Octeon Central Interrupt Unit");
return (0);
}
static int
ciu_attach(device_t dev)
{
char name[MAXCOMLEN + 1];
struct ciu_softc *sc;
unsigned i;
int error;
int rid;
sc = device_get_softc(dev);
rid = 0;
sc->ciu_irq = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, CIU_IRQ_HARD,
CIU_IRQ_HARD, 1, RF_ACTIVE);
if (sc->ciu_irq == NULL) {
device_printf(dev, "could not allocate irq%d\n", CIU_IRQ_HARD);
return (ENXIO);
}
error = bus_setup_intr(dev, sc->ciu_irq, INTR_TYPE_MISC, ciu_intr,
NULL, sc, NULL);
if (error != 0) {
device_printf(dev, "bus_setup_intr failed: %d\n", error);
return (error);
}
sc->irq_rman.rm_type = RMAN_ARRAY;
sc->irq_rman.rm_descr = "CIU IRQ";
error = rman_init(&sc->irq_rman);
if (error != 0)
return (error);
/*
* We have two contiguous IRQ regions, use a single rman.
*/
error = rman_manage_region(&sc->irq_rman, CIU_IRQ_EN0_BEGIN,
CIU_IRQ_EN1_END);
if (error != 0)
return (error);
for (i = 0; i < CIU_IRQ_EN0_COUNT; i++) {
snprintf(name, sizeof name, "int%d:", i + CIU_IRQ_EN0_BEGIN);
ciu_en0_intrcnt[i] = mips_intrcnt_create(name);
}
for (i = 0; i < CIU_IRQ_EN1_COUNT; i++) {
snprintf(name, sizeof name, "int%d:", i + CIU_IRQ_EN1_BEGIN);
ciu_en1_intrcnt[i] = mips_intrcnt_create(name);
}
bus_generic_probe(dev);
bus_generic_attach(dev);
return (0);
}
static struct resource *
ciu_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;
struct ciu_softc *sc;
sc = device_get_softc(bus);
switch (type) {
case SYS_RES_IRQ:
break;
default:
return (bus_alloc_resource(device_get_parent(bus), type, rid,
start, end, count, flags));
}
/*
* One interrupt at a time for now.
*/
if (start != end)
return (NULL);
res = rman_reserve_resource(&sc->irq_rman, start, end, count, flags,
child);
if (res != NULL)
return (res);
return (NULL);
}
static int
ciu_setup_intr(device_t bus, device_t child, struct resource *res, int flags,
driver_filter_t *filter, driver_intr_t *intr, void *arg,
void **cookiep)
{
struct intr_event *event, **eventp;
void (*mask_func)(void *);
void (*unmask_func)(void *);
int (*bind_func)(void *, u_char);
mips_intrcnt_t intrcnt;
int error;
int irq;
irq = rman_get_start(res);
if (irq <= CIU_IRQ_EN0_END) {
eventp = &ciu_en0_intr_events[irq - CIU_IRQ_EN0_BEGIN];
intrcnt = ciu_en0_intrcnt[irq - CIU_IRQ_EN0_BEGIN];
mask_func = ciu_en0_intr_mask;
unmask_func = ciu_en0_intr_unmask;
#ifdef SMP
bind_func = ciu_en0_intr_bind;
#endif
} else {
eventp = &ciu_en1_intr_events[irq - CIU_IRQ_EN1_BEGIN];
intrcnt = ciu_en1_intrcnt[irq - CIU_IRQ_EN1_BEGIN];
mask_func = ciu_en1_intr_mask;
unmask_func = ciu_en1_intr_unmask;
#ifdef SMP
bind_func = ciu_en1_intr_bind;
#endif
}
#if !defined(SMP)
bind_func = NULL;
#endif
if ((event = *eventp) == NULL) {
error = intr_event_create(eventp, (void *)(uintptr_t)irq, 0,
irq, mask_func, unmask_func, NULL, bind_func, "int%d", irq);
if (error != 0)
return (error);
event = *eventp;
unmask_func((void *)(uintptr_t)irq);
}
intr_event_add_handler(event, device_get_nameunit(child),
filter, intr, arg, intr_priority(flags), flags, cookiep);
mips_intrcnt_setname(intrcnt, event->ie_fullname);
return (0);
}
static int
ciu_teardown_intr(device_t bus, device_t child, struct resource *res,
void *cookie)
{
int error;
error = intr_event_remove_handler(cookie);
if (error != 0)
return (error);
return (0);
}
#ifdef SMP
static int
ciu_bind_intr(device_t bus, device_t child, struct resource *res, int cpu)
{
struct intr_event *event;
int irq;
irq = rman_get_start(res);
if (irq <= CIU_IRQ_EN0_END)
event = ciu_en0_intr_events[irq - CIU_IRQ_EN0_BEGIN];
else
event = ciu_en1_intr_events[irq - CIU_IRQ_EN1_BEGIN];
return (intr_event_bind(event, cpu));
}
#endif
static int
ciu_describe_intr(device_t bus, device_t child, struct resource *res,
void *cookie, const char *descr)
{
struct intr_event *event;
mips_intrcnt_t intrcnt;
int error;
int irq;
irq = rman_get_start(res);
if (irq <= CIU_IRQ_EN0_END) {
event = ciu_en0_intr_events[irq - CIU_IRQ_EN0_BEGIN];
intrcnt = ciu_en0_intrcnt[irq - CIU_IRQ_EN0_BEGIN];
} else {
event = ciu_en1_intr_events[irq - CIU_IRQ_EN1_BEGIN];
intrcnt = ciu_en1_intrcnt[irq - CIU_IRQ_EN1_BEGIN];
}
error = intr_event_describe_handler(event, cookie, descr);
if (error != 0)
return (error);
mips_intrcnt_setname(intrcnt, event->ie_fullname);
return (0);
}
static void
ciu_hinted_child(device_t bus, const char *dname, int dunit)
{
BUS_ADD_CHILD(bus, 0, dname, dunit);
}
static void
ciu_en0_intr_mask(void *arg)
{
uint64_t mask;
int irq;
irq = (uintptr_t)arg;
mask = cvmx_read_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num()*2));
mask &= ~(1ull << (irq - CIU_IRQ_EN0_BEGIN));
cvmx_write_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num()*2), mask);
}
static void
ciu_en0_intr_unmask(void *arg)
{
uint64_t mask;
int irq;
irq = (uintptr_t)arg;
mask = cvmx_read_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num()*2));
mask |= 1ull << (irq - CIU_IRQ_EN0_BEGIN);
cvmx_write_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num()*2), mask);
}
#ifdef SMP
static int
ciu_en0_intr_bind(void *arg, u_char target)
{
uint64_t mask;
int core;
int irq;
irq = (uintptr_t)arg;
CPU_FOREACH(core) {
mask = cvmx_read_csr(CVMX_CIU_INTX_EN0(core*2));
if (core == target)
mask |= 1ull << (irq - CIU_IRQ_EN0_BEGIN);
else
mask &= ~(1ull << (irq - CIU_IRQ_EN0_BEGIN));
cvmx_write_csr(CVMX_CIU_INTX_EN0(core*2), mask);
}
return (0);
}
#endif
static void
ciu_en1_intr_mask(void *arg)
{
uint64_t mask;
int irq;
irq = (uintptr_t)arg;
mask = cvmx_read_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num()*2));
mask &= ~(1ull << (irq - CIU_IRQ_EN1_BEGIN));
cvmx_write_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num()*2), mask);
}
static void
ciu_en1_intr_unmask(void *arg)
{
uint64_t mask;
int irq;
irq = (uintptr_t)arg;
mask = cvmx_read_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num()*2));
mask |= 1ull << (irq - CIU_IRQ_EN1_BEGIN);
cvmx_write_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num()*2), mask);
}
#ifdef SMP
static int
ciu_en1_intr_bind(void *arg, u_char target)
{
uint64_t mask;
int core;
int irq;
irq = (uintptr_t)arg;
CPU_FOREACH(core) {
mask = cvmx_read_csr(CVMX_CIU_INTX_EN1(core*2));
if (core == target)
mask |= 1ull << (irq - CIU_IRQ_EN1_BEGIN);
else
mask &= ~(1ull << (irq - CIU_IRQ_EN1_BEGIN));
cvmx_write_csr(CVMX_CIU_INTX_EN1(core*2), mask);
}
return (0);
}
#endif
static int
ciu_intr(void *arg)
{
struct ciu_softc *sc;
uint64_t en0_sum, en1_sum;
uint64_t en0_mask, en1_mask;
int irq_index;
int error;
sc = arg;
(void)sc;
en0_sum = cvmx_read_csr(CVMX_CIU_INTX_SUM0(cvmx_get_core_num()*2));
en1_sum = cvmx_read_csr(CVMX_CIU_INT_SUM1);
en0_mask = cvmx_read_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num()*2));
en1_mask = cvmx_read_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num()*2));
en0_sum &= en0_mask;
en1_sum &= en1_mask;
if (en0_sum == 0 && en1_sum == 0)
return (FILTER_STRAY);
irq_index = 0;
for (irq_index = 0; en0_sum != 0; irq_index++, en0_sum >>= 1) {
if ((en0_sum & 1) == 0)
continue;
mips_intrcnt_inc(ciu_en0_intrcnt[irq_index]);
error = intr_event_handle(ciu_en0_intr_events[irq_index], NULL);
if (error != 0)
printf("%s: stray en0 irq%d\n", __func__, irq_index);
}
irq_index = 0;
for (irq_index = 0; en1_sum != 0; irq_index++, en1_sum >>= 1) {
if ((en1_sum & 1) == 0)
continue;
mips_intrcnt_inc(ciu_en1_intrcnt[irq_index]);
error = intr_event_handle(ciu_en1_intr_events[irq_index], NULL);
if (error != 0)
printf("%s: stray en1 irq%d\n", __func__, irq_index);
}
return (FILTER_HANDLED);
}
static device_method_t ciu_methods[] = {
DEVMETHOD(device_probe, ciu_probe),
DEVMETHOD(device_attach, ciu_attach),
DEVMETHOD(bus_alloc_resource, ciu_alloc_resource),
DEVMETHOD(bus_activate_resource,bus_generic_activate_resource),
DEVMETHOD(bus_setup_intr, ciu_setup_intr),
DEVMETHOD(bus_teardown_intr, ciu_teardown_intr),
#ifdef SMP
DEVMETHOD(bus_bind_intr, ciu_bind_intr),
#endif
DEVMETHOD(bus_describe_intr, ciu_describe_intr),
DEVMETHOD(bus_add_child, bus_generic_add_child),
DEVMETHOD(bus_hinted_child, ciu_hinted_child),
{ 0, 0 }
};
static driver_t ciu_driver = {
"ciu",
ciu_methods,
sizeof(struct ciu_softc),
};
static devclass_t ciu_devclass;
DRIVER_MODULE(ciu, nexus, ciu_driver, ciu_devclass, 0, 0);
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