freebsd-dev/sys/arm/ti/aintc.c

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2012 Damjan Marion <dmarion@Freebsd.org>
* All rights reserved.
*
* Based on OMAP3 INTC code by Ben Gray
*
* 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 "opt_platform.h"
#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/proc.h>
#include <sys/rman.h>
#include <machine/bus.h>
#include <machine/intr.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include "pic_if.h"
#define INTC_REVISION 0x00
#define INTC_SYSCONFIG 0x10
#define INTC_SYSSTATUS 0x14
#define INTC_SIR_IRQ 0x40
#define INTC_CONTROL 0x48
#define INTC_THRESHOLD 0x68
#define INTC_MIR_CLEAR(x) (0x88 + ((x) * 0x20))
#define INTC_MIR_SET(x) (0x8C + ((x) * 0x20))
#define INTC_ISR_SET(x) (0x90 + ((x) * 0x20))
#define INTC_ISR_CLEAR(x) (0x94 + ((x) * 0x20))
#define INTC_SIR_SPURIOUS_MASK 0xffffff80
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#define INTC_SIR_ACTIVE_MASK 0x7f
#define INTC_NIRQS 128
struct ti_aintc_irqsrc {
struct intr_irqsrc tai_isrc;
u_int tai_irq;
};
struct ti_aintc_softc {
device_t sc_dev;
struct resource * aintc_res[3];
bus_space_tag_t aintc_bst;
bus_space_handle_t aintc_bsh;
uint8_t ver;
struct ti_aintc_irqsrc aintc_isrcs[INTC_NIRQS];
};
static struct resource_spec ti_aintc_spec[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE },
{ -1, 0 }
};
#define aintc_read_4(_sc, reg) \
bus_space_read_4((_sc)->aintc_bst, (_sc)->aintc_bsh, (reg))
#define aintc_write_4(_sc, reg, val) \
bus_space_write_4((_sc)->aintc_bst, (_sc)->aintc_bsh, (reg), (val))
/* List of compatible strings for FDT tree */
static struct ofw_compat_data compat_data[] = {
{"ti,am33xx-intc", 1},
{"ti,omap2-intc", 1},
{NULL, 0},
};
static inline void
ti_aintc_irq_eoi(struct ti_aintc_softc *sc)
{
aintc_write_4(sc, INTC_CONTROL, 1);
}
static inline void
ti_aintc_irq_mask(struct ti_aintc_softc *sc, u_int irq)
{
aintc_write_4(sc, INTC_MIR_SET(irq >> 5), (1UL << (irq & 0x1F)));
}
static inline void
ti_aintc_irq_unmask(struct ti_aintc_softc *sc, u_int irq)
{
aintc_write_4(sc, INTC_MIR_CLEAR(irq >> 5), (1UL << (irq & 0x1F)));
}
static int
ti_aintc_intr(void *arg)
{
uint32_t irq;
struct ti_aintc_softc *sc = arg;
/* Get active interrupt */
irq = aintc_read_4(sc, INTC_SIR_IRQ);
if ((irq & INTC_SIR_SPURIOUS_MASK) != 0) {
device_printf(sc->sc_dev,
"Spurious interrupt detected (0x%08x)\n", irq);
ti_aintc_irq_eoi(sc);
return (FILTER_HANDLED);
}
/* Only level-sensitive interrupts detection is supported. */
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irq &= INTC_SIR_ACTIVE_MASK;
if (intr_isrc_dispatch(&sc->aintc_isrcs[irq].tai_isrc,
curthread->td_intr_frame) != 0) {
ti_aintc_irq_mask(sc, irq);
ti_aintc_irq_eoi(sc);
device_printf(sc->sc_dev, "Stray irq %u disabled\n", irq);
}
arm_irq_memory_barrier(irq); /* XXX */
return (FILTER_HANDLED);
}
static void
ti_aintc_enable_intr(device_t dev, struct intr_irqsrc *isrc)
{
u_int irq = ((struct ti_aintc_irqsrc *)isrc)->tai_irq;
struct ti_aintc_softc *sc = device_get_softc(dev);
arm_irq_memory_barrier(irq);
ti_aintc_irq_unmask(sc, irq);
}
static void
ti_aintc_disable_intr(device_t dev, struct intr_irqsrc *isrc)
{
u_int irq = ((struct ti_aintc_irqsrc *)isrc)->tai_irq;
struct ti_aintc_softc *sc = device_get_softc(dev);
ti_aintc_irq_mask(sc, irq);
}
static int
ti_aintc_map_intr(device_t dev, struct intr_map_data *data,
struct intr_irqsrc **isrcp)
{
struct intr_map_data_fdt *daf;
struct ti_aintc_softc *sc;
if (data->type != INTR_MAP_DATA_FDT)
return (ENOTSUP);
daf = (struct intr_map_data_fdt *)data;
if (daf->ncells != 1 || daf->cells[0] >= INTC_NIRQS)
return (EINVAL);
sc = device_get_softc(dev);
*isrcp = &sc->aintc_isrcs[daf->cells[0]].tai_isrc;
return (0);
}
static void
ti_aintc_pre_ithread(device_t dev, struct intr_irqsrc *isrc)
{
u_int irq = ((struct ti_aintc_irqsrc *)isrc)->tai_irq;
struct ti_aintc_softc *sc = device_get_softc(dev);
ti_aintc_irq_mask(sc, irq);
ti_aintc_irq_eoi(sc);
}
static void
ti_aintc_post_ithread(device_t dev, struct intr_irqsrc *isrc)
{
ti_aintc_enable_intr(dev, isrc);
}
static void
ti_aintc_post_filter(device_t dev, struct intr_irqsrc *isrc)
{
ti_aintc_irq_eoi(device_get_softc(dev));
}
static int
ti_aintc_pic_attach(struct ti_aintc_softc *sc)
{
struct intr_pic *pic;
int error;
uint32_t irq;
const char *name;
intptr_t xref;
name = device_get_nameunit(sc->sc_dev);
for (irq = 0; irq < INTC_NIRQS; irq++) {
sc->aintc_isrcs[irq].tai_irq = irq;
error = intr_isrc_register(&sc->aintc_isrcs[irq].tai_isrc,
sc->sc_dev, 0, "%s,%u", name, irq);
if (error != 0)
return (error);
}
xref = OF_xref_from_node(ofw_bus_get_node(sc->sc_dev));
pic = intr_pic_register(sc->sc_dev, xref);
if (pic == NULL)
return (ENXIO);
return (intr_pic_claim_root(sc->sc_dev, xref, ti_aintc_intr, sc, 0));
}
static int
ti_aintc_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, "TI AINTC Interrupt Controller");
return (BUS_PROBE_DEFAULT);
}
static int
ti_aintc_attach(device_t dev)
{
struct ti_aintc_softc *sc = device_get_softc(dev);
uint32_t x;
sc->sc_dev = dev;
if (bus_alloc_resources(dev, ti_aintc_spec, sc->aintc_res)) {
device_printf(dev, "could not allocate resources\n");
return (ENXIO);
}
sc->aintc_bst = rman_get_bustag(sc->aintc_res[0]);
sc->aintc_bsh = rman_get_bushandle(sc->aintc_res[0]);
x = aintc_read_4(sc, INTC_REVISION);
device_printf(dev, "Revision %u.%u\n",(x >> 4) & 0xF, x & 0xF);
/* SoftReset */
aintc_write_4(sc, INTC_SYSCONFIG, 2);
/* Wait for reset to complete */
while(!(aintc_read_4(sc, INTC_SYSSTATUS) & 1));
/*Set Priority Threshold */
aintc_write_4(sc, INTC_THRESHOLD, 0xFF);
if (ti_aintc_pic_attach(sc) != 0) {
device_printf(dev, "could not attach PIC\n");
return (ENXIO);
}
return (0);
}
static device_method_t ti_aintc_methods[] = {
DEVMETHOD(device_probe, ti_aintc_probe),
DEVMETHOD(device_attach, ti_aintc_attach),
DEVMETHOD(pic_disable_intr, ti_aintc_disable_intr),
DEVMETHOD(pic_enable_intr, ti_aintc_enable_intr),
DEVMETHOD(pic_map_intr, ti_aintc_map_intr),
DEVMETHOD(pic_post_filter, ti_aintc_post_filter),
DEVMETHOD(pic_post_ithread, ti_aintc_post_ithread),
DEVMETHOD(pic_pre_ithread, ti_aintc_pre_ithread),
{ 0, 0 }
};
static driver_t ti_aintc_driver = {
"ti_aintc",
ti_aintc_methods,
sizeof(struct ti_aintc_softc),
};
static devclass_t ti_aintc_devclass;
EARLY_DRIVER_MODULE(ti_aintc, simplebus, ti_aintc_driver, ti_aintc_devclass,
0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE);
SIMPLEBUS_PNP_INFO(compat_data);