freebsd-dev/sys/mips/mediatek/mtk_intr_v2.c
Andrew Turner 9346e9130d Return the struct intr_pic pointer from intr_pic_register. This will be
needed in later changes where we may not be able to lock the pic list lock
to perform a lookup, e.g. from within interrupt context.

Obtained from:	ABT Systems Ltd
Sponsored by:	The FreeBSD Foundation
2016-05-18 15:05:44 +00:00

353 lines
8.2 KiB
C

/*-
* Copyright (c) 2015 Stanislav Galabov
* Copyright (c) 2015 Alexander Kabaev
* 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,
* without modification, immediately at the beginning of the file.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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 "opt_platform.h"
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/ktr.h>
#include <sys/module.h>
#include <sys/malloc.h>
#include <sys/rman.h>
#include <sys/pcpu.h>
#include <sys/proc.h>
#include <sys/cpuset.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/smp.h>
#include <sys/sched.h>
#include <machine/bus.h>
#include <machine/intr.h>
#include <machine/smp.h>
#include <dev/fdt/fdt_common.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include "pic_if.h"
#define MTK_NIRQS 32
#define MTK_IRQ0STAT 0x009c
#define MTK_IRQ1STAT 0x00a0
#define MTK_INTTYPE 0x0000
#define MTK_INTRAW 0x00a4
#define MTK_INTENA 0x0080
#define MTK_INTDIS 0x0078
static int mtk_pic_intr(void *);
struct mtk_pic_irqsrc {
struct intr_irqsrc isrc;
u_int irq;
};
struct mtk_pic_softc {
device_t pic_dev;
void * pic_intrhand;
struct resource * pic_res[2];
struct mtk_pic_irqsrc pic_irqs[MTK_NIRQS];
struct mtx mutex;
uint32_t nirqs;
};
#define PIC_INTR_ISRC(sc, irq) (&(sc)->pic_irqs[(irq)].isrc)
static struct resource_spec mtk_pic_spec[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE }, /* Registers */
{ SYS_RES_IRQ, 0, RF_ACTIVE }, /* Parent interrupt 1 */
// { SYS_RES_IRQ, 1, RF_ACTIVE }, /* Parent interrupt 2 */
{ -1, 0 }
};
static struct ofw_compat_data compat_data[] = {
{ "ralink,mt7628an-intc", 1 },
{ NULL, 0 }
};
#define READ4(_sc, _reg) bus_read_4((_sc)->pic_res[0], _reg)
#define WRITE4(_sc, _reg, _val) bus_write_4((_sc)->pic_res[0], _reg, _val)
static int
mtk_pic_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
return (ENXIO);
device_set_desc(dev, "MTK Interrupt Controller (v2)");
return (BUS_PROBE_DEFAULT);
}
static inline void
pic_irq_unmask(struct mtk_pic_softc *sc, u_int irq)
{
WRITE4(sc, MTK_INTENA, (1u << (irq)));
}
static inline void
pic_irq_mask(struct mtk_pic_softc *sc, u_int irq)
{
WRITE4(sc, MTK_INTDIS, (1u << (irq)));
}
static inline intptr_t
pic_xref(device_t dev)
{
return (OF_xref_from_node(ofw_bus_get_node(dev)));
}
static int
mtk_pic_register_isrcs(struct mtk_pic_softc *sc)
{
int error;
uint32_t irq;
struct intr_irqsrc *isrc;
const char *name;
name = device_get_nameunit(sc->pic_dev);
for (irq = 0; irq < sc->nirqs; irq++) {
sc->pic_irqs[irq].irq = irq;
isrc = PIC_INTR_ISRC(sc, irq);
error = intr_isrc_register(isrc, sc->pic_dev, 0, "%s", name);
if (error != 0) {
/* XXX call intr_isrc_deregister */
device_printf(sc->pic_dev, "%s failed", __func__);
return (error);
}
}
return (0);
}
static int
mtk_pic_attach(device_t dev)
{
struct mtk_pic_softc *sc;
intptr_t xref = pic_xref(dev);
sc = device_get_softc(dev);
if (bus_alloc_resources(dev, mtk_pic_spec, sc->pic_res)) {
device_printf(dev, "could not allocate resources\n");
return (ENXIO);
}
sc->pic_dev = dev;
/* Initialize mutex */
mtx_init(&sc->mutex, "PIC lock", "", MTX_SPIN);
/* Set the number of interrupts */
sc->nirqs = nitems(sc->pic_irqs);
/* Mask all interrupts */
WRITE4(sc, MTK_INTDIS, 0xFFFFFFFF);
/* But enable interrupt generation/masking */
WRITE4(sc, MTK_INTENA, 0x00000000);
/* Set all interrupts to type 0 */
WRITE4(sc, MTK_INTTYPE, 0xFFFFFFFF);
/* Register the interrupts */
if (mtk_pic_register_isrcs(sc) != 0) {
device_printf(dev, "could not register PIC ISRCs\n");
goto cleanup;
}
/*
* Now, when everything is initialized, it's right time to
* register interrupt controller to interrupt framefork.
*/
if (intr_pic_register(dev, xref) == NULL) {
device_printf(dev, "could not register PIC\n");
goto cleanup;
}
if (bus_setup_intr(dev, sc->pic_res[1], INTR_TYPE_CLK,
mtk_pic_intr, NULL, sc, &sc->pic_intrhand)) {
device_printf(dev, "could not setup irq handler\n");
intr_pic_deregister(dev, xref);
goto cleanup;
}
return (0);
cleanup:
bus_release_resources(dev, mtk_pic_spec, sc->pic_res);
return(ENXIO);
}
static int
mtk_pic_intr(void *arg)
{
struct mtk_pic_softc *sc = arg;
struct thread *td;
uint32_t i, intr;
td = curthread;
/* Workaround: do not inflate intr nesting level */
td->td_intr_nesting_level--;
#ifdef _notyet_
intr = READ4(sc, MTK_IRQ1STAT);
while ((i = fls(intr)) != 0) {
i--;
intr &= ~(1u << i);
if (intr_isrc_dispatch(PIC_INTR_ISRC(sc, i),
curthread->td_intr_frame) != 0) {
device_printf(sc->pic_dev,
"Stray interrupt %u detected\n", i);
pic_irq_mask(sc, i);
continue;
}
}
KASSERT(i == 0, ("all interrupts handled"));
#endif
intr = READ4(sc, MTK_IRQ0STAT);
while ((i = fls(intr)) != 0) {
i--;
intr &= ~(1u << i);
if (intr_isrc_dispatch(PIC_INTR_ISRC(sc, i),
curthread->td_intr_frame) != 0) {
device_printf(sc->pic_dev,
"Stray interrupt %u detected\n", i);
pic_irq_mask(sc, i);
continue;
}
}
KASSERT(i == 0, ("all interrupts handled"));
td->td_intr_nesting_level++;
return (FILTER_HANDLED);
}
static int
mtk_pic_map_intr(device_t dev, struct intr_map_data *data,
struct intr_irqsrc **isrcp)
{
#ifdef FDT
struct intr_map_data_fdt *daf;
struct mtk_pic_softc *sc;
if (data->type != INTR_MAP_DATA_FDT)
return (ENOTSUP);
sc = device_get_softc(dev);
daf = (struct intr_map_data_fdt *)data;
if (daf->ncells != 1 || daf->cells[0] >= sc->nirqs)
return (EINVAL);
*isrcp = PIC_INTR_ISRC(sc, daf->cells[0]);
return (0);
#else
return (ENOTSUP);
#endif
}
static void
mtk_pic_enable_intr(device_t dev, struct intr_irqsrc *isrc)
{
u_int irq;
irq = ((struct mtk_pic_irqsrc *)isrc)->irq;
pic_irq_unmask(device_get_softc(dev), irq);
}
static void
mtk_pic_disable_intr(device_t dev, struct intr_irqsrc *isrc)
{
u_int irq;
irq = ((struct mtk_pic_irqsrc *)isrc)->irq;
pic_irq_mask(device_get_softc(dev), irq);
}
static void
mtk_pic_pre_ithread(device_t dev, struct intr_irqsrc *isrc)
{
mtk_pic_disable_intr(dev, isrc);
}
static void
mtk_pic_post_ithread(device_t dev, struct intr_irqsrc *isrc)
{
mtk_pic_enable_intr(dev, isrc);
}
static void
mtk_pic_post_filter(device_t dev, struct intr_irqsrc *isrc)
{
}
static device_method_t mtk_pic_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, mtk_pic_probe),
DEVMETHOD(device_attach, mtk_pic_attach),
/* Interrupt controller interface */
DEVMETHOD(pic_disable_intr, mtk_pic_disable_intr),
DEVMETHOD(pic_enable_intr, mtk_pic_enable_intr),
DEVMETHOD(pic_map_intr, mtk_pic_map_intr),
DEVMETHOD(pic_post_filter, mtk_pic_post_filter),
DEVMETHOD(pic_post_ithread, mtk_pic_post_ithread),
DEVMETHOD(pic_pre_ithread, mtk_pic_pre_ithread),
{ 0, 0 }
};
static driver_t mtk_pic_driver = {
"intc",
mtk_pic_methods,
sizeof(struct mtk_pic_softc),
};
static devclass_t mtk_pic_devclass;
EARLY_DRIVER_MODULE(intc_v2, simplebus, mtk_pic_driver, mtk_pic_devclass, 0, 0,
BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE);