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head/sys/arm/ralink/rt1310_intc.c

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/*-
* Copyright (c) 2010 Jakub Wojciech Klama <jceel@FreeBSD.org>
* Copyright (c) 2015 Hiroki Mori
* 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 "opt_platform.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/types.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/proc.h>
#include <sys/rman.h>
#include <vm/vm.h>
#include <vm/vm_kern.h>
#include <vm/pmap.h>
#include <vm/vm_page.h>
#include <vm/vm_extern.h>
#define _ARM32_BUS_DMA_PRIVATE
#include <machine/bus.h>
#include <machine/intr.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 <arm/ralink/rt1310reg.h>
#define INTC_NIRQS 32
#ifdef INTRNG
#include "pic_if.h"
struct rt1310_irqsrc {
struct intr_irqsrc ri_isrc;
u_int ri_irq;
};
#endif
struct rt1310_intc_softc {
device_t dev;
struct resource * ri_res;
bus_space_tag_t ri_bst;
bus_space_handle_t ri_bsh;
#ifdef INTRNG
struct rt1310_irqsrc ri_isrcs[INTC_NIRQS];
#endif
};
static int rt1310_intc_probe(device_t);
static int rt1310_intc_attach(device_t);
#ifndef INTRNG
static void rt1310_intc_eoi(void *);
#else
static int rt1310_pic_attach(struct rt1310_intc_softc *sc);
#endif
static struct rt1310_intc_softc *intc_softc = NULL;
#define intc_read_4(_sc, _reg) \
bus_space_read_4((_sc)->ri_bst, (_sc)->ri_bsh, (_reg))
#define intc_write_4(_sc, _reg, _val) \
bus_space_write_4((_sc)->ri_bst, (_sc)->ri_bsh, (_reg), (_val))
struct rt1310_irqdef {
u_int ri_trig;
u_int ri_prio;
};
struct rt1310_irqdef irqdef[INTC_NIRQS] = {
{RT_INTC_TRIG_HIGH_LVL, 2}, /* 0 */
{RT_INTC_TRIG_HIGH_LVL, 2},
{RT_INTC_TRIG_HIGH_LVL, 2},
{RT_INTC_TRIG_HIGH_LVL, 1},
{RT_INTC_TRIG_HIGH_LVL, 2},
{RT_INTC_TRIG_HIGH_LVL, 1},
{RT_INTC_TRIG_HIGH_LVL, 1},
{RT_INTC_TRIG_HIGH_LVL, 1},
{RT_INTC_TRIG_HIGH_LVL, 1}, /* 8 */
{RT_INTC_TRIG_HIGH_LVL, 1},
{RT_INTC_TRIG_HIGH_LVL, 2},
{RT_INTC_TRIG_LOW_LVL, 2},
{RT_INTC_TRIG_LOW_LVL, 2},
{RT_INTC_TRIG_LOW_LVL, 4},
{RT_INTC_TRIG_HIGH_LVL, 2},
{RT_INTC_TRIG_HIGH_LVL, 2},
{RT_INTC_TRIG_HIGH_LVL, 2}, /* 16 */
{RT_INTC_TRIG_HIGH_LVL, 2},
{RT_INTC_TRIG_LOW_LVL, 2},
{RT_INTC_TRIG_LOW_LVL, 2},
{RT_INTC_TRIG_LOW_LVL, 2},
{RT_INTC_TRIG_LOW_LVL, 2},
{RT_INTC_TRIG_NEG_EDGE, 2},
{RT_INTC_TRIG_HIGH_LVL, 3},
{RT_INTC_TRIG_HIGH_LVL, 2}, /* 24 */
{RT_INTC_TRIG_POS_EDGE, 2},
{RT_INTC_TRIG_POS_EDGE, 2},
{RT_INTC_TRIG_HIGH_LVL, 2},
{RT_INTC_TRIG_HIGH_LVL, 2},
{RT_INTC_TRIG_POS_EDGE, 2},
{RT_INTC_TRIG_POS_EDGE, 3},
{RT_INTC_TRIG_POS_EDGE, 3},
};
static int
rt1310_intc_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "rt,pic"))
return (ENXIO);
#ifdef INTRNG
device_set_desc(dev, "RT1310 INTRNG Interrupt Controller");
#else
device_set_desc(dev, "RT1310 Interrupt Controller");
#endif
return (BUS_PROBE_DEFAULT);
}
static int
rt1310_intc_attach(device_t dev)
{
struct rt1310_intc_softc *sc = device_get_softc(dev);
int rid = 0;
int i;
if (intc_softc)
return (ENXIO);
sc->dev = dev;
sc->ri_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
if (!sc->ri_res) {
device_printf(dev, "could not alloc resources\n");
return (ENXIO);
}
sc->ri_bst = rman_get_bustag(sc->ri_res);
sc->ri_bsh = rman_get_bushandle(sc->ri_res);
intc_softc = sc;
#ifndef INTRNG
arm_post_filter = rt1310_intc_eoi;
#else
rt1310_pic_attach(sc);
#endif
intc_write_4(sc, RT_INTC_IECR, 0);
intc_write_4(sc, RT_INTC_ICCR, ~0);
for (i = 0; i <= INTC_NIRQS; ++i) {
intc_write_4(sc, RT_INTC_SCR0+i*4,
(irqdef[i].ri_trig << RT_INTC_TRIG_SHIF) |
irqdef[i].ri_prio);
intc_write_4(sc, RT_INTC_SVR0+i*4, i);
}
/* Clear interrupt status registers and disable all interrupts */
intc_write_4(sc, RT_INTC_ICCR, ~0);
intc_write_4(sc, RT_INTC_IMR, 0);
return (0);
}
#ifndef INTRNG
int
arm_get_next_irq(int last)
{
struct rt1310_intc_softc *sc = intc_softc;
uint32_t value;
int i;
value = intc_read_4(sc, RT_INTC_IPR);
for (i = 0; i < 32; i++) {
if (value & (1 << i))
return (i);
}
return (-1);
}
void
arm_mask_irq(uintptr_t nb)
{
struct rt1310_intc_softc *sc = intc_softc;
uint32_t value;
/* Make sure that interrupt isn't active already */
rt1310_intc_eoi((void *)nb);
/* Clear bit in ER register */
value = intc_read_4(sc, RT_INTC_IECR);
value &= ~(1 << nb);
intc_write_4(sc, RT_INTC_IECR, value);
intc_write_4(sc, RT_INTC_IMR, value);
intc_write_4(sc, RT_INTC_ICCR, 1 << nb);
}
void
arm_unmask_irq(uintptr_t nb)
{
struct rt1310_intc_softc *sc = intc_softc;
uint32_t value;
value = intc_read_4(sc, RT_INTC_IECR);
value |= (1 << nb);
intc_write_4(sc, RT_INTC_IMR, value);
intc_write_4(sc, RT_INTC_IECR, value);
}
static void
rt1310_intc_eoi(void *data)
{
struct rt1310_intc_softc *sc = intc_softc;
int nb = (int)data;
intc_write_4(sc, RT_INTC_ICCR, 1 << nb);
if (nb == 0) {
uint32_t value;
value = intc_read_4(sc, RT_INTC_IECR);
value &= ~(1 << nb);
intc_write_4(sc, RT_INTC_IECR, value);
intc_write_4(sc, RT_INTC_IMR, value);
}
}
#else
static void
rt1310_enable_intr(device_t dev, struct intr_irqsrc *isrc)
{
u_int irq;
unsigned int value;
struct rt1310_intc_softc *sc;
sc = intc_softc;
irq = ((struct rt1310_irqsrc *)isrc)->ri_irq;
value = intc_read_4(sc, RT_INTC_IECR);
value |= (1 << irq);
intc_write_4(sc, RT_INTC_IMR, value);
intc_write_4(sc, RT_INTC_IECR, value);
}
static void
rt1310_disable_intr(device_t dev, struct intr_irqsrc *isrc)
{
u_int irq;
unsigned int value;
struct rt1310_intc_softc *sc;
sc = intc_softc;
irq = ((struct rt1310_irqsrc *)isrc)->ri_irq;
/* Clear bit in ER register */
value = intc_read_4(sc, RT_INTC_IECR);
value &= ~(1 << irq);
intc_write_4(sc, RT_INTC_IECR, value);
intc_write_4(sc, RT_INTC_IMR, value);
intc_write_4(sc, RT_INTC_ICCR, 1 << irq);
}
static int
rt1310_map_intr(device_t dev, struct intr_map_data *data,
struct intr_irqsrc **isrcp)
{
struct intr_map_data_fdt *daf;
struct rt1310_intc_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->ri_isrcs[daf->cells[0]].ri_isrc;
return (0);
}
static void
rt1310_pre_ithread(device_t dev, struct intr_irqsrc *isrc)
{
arm_irq_memory_barrier(0);
rt1310_disable_intr(dev, isrc);
}
static void
rt1310_post_ithread(device_t dev, struct intr_irqsrc *isrc)
{
arm_irq_memory_barrier(0);
rt1310_enable_intr(dev, isrc);
}
static void
rt1310_post_filter(device_t dev, struct intr_irqsrc *isrc)
{
u_int irq;
struct rt1310_intc_softc *sc;
arm_irq_memory_barrier(0);
sc = intc_softc;
irq = ((struct rt1310_irqsrc *)isrc)->ri_irq;
intc_write_4(sc, RT_INTC_ICCR, 1 << irq);
}
static int
rt1310_intr(void *arg)
{
uint32_t irq;
struct rt1310_intc_softc *sc = arg;
irq = ffs(intc_read_4(sc, RT_INTC_IPR)) - 1;
if (intr_isrc_dispatch(&sc->ri_isrcs[irq].ri_isrc,
curthread->td_intr_frame) != 0) {
intc_write_4(sc, RT_INTC_ICCR, 1 << irq);
device_printf(sc->dev, "Stray irq %u disabled\n", irq);
}
arm_irq_memory_barrier(0);
return (FILTER_HANDLED);
}
static int
rt1310_pic_attach(struct rt1310_intc_softc *sc)
{
struct intr_pic *pic;
int error;
uint32_t irq;
const char *name;
intptr_t xref;
name = device_get_nameunit(sc->dev);
for (irq = 0; irq < INTC_NIRQS; irq++) {
sc->ri_isrcs[irq].ri_irq = irq;
error = intr_isrc_register(&sc->ri_isrcs[irq].ri_isrc,
sc->dev, 0, "%s,%u", name, irq);
if (error != 0)
return (error);
}
xref = OF_xref_from_node(ofw_bus_get_node(sc->dev));
pic = intr_pic_register(sc->dev, xref);
if (pic == NULL)
return (ENXIO);
return (intr_pic_claim_root(sc->dev, xref, rt1310_intr, sc, 0));
}
#endif
struct fdt_fixup_entry fdt_fixup_table[] = {
{ NULL, NULL }
};
#ifndef INTRNG
static int
fdt_pic_decode_ic(phandle_t node, pcell_t *intr, int *interrupt, int *trig,
int *pol)
{
if (!fdt_is_compatible(node, "lpc,pic"))
return (ENXIO);
*interrupt = fdt32_to_cpu(intr[0]);
*trig = INTR_TRIGGER_CONFORM;
*pol = INTR_POLARITY_CONFORM;
return (0);
}
fdt_pic_decode_t fdt_pic_table[] = {
&fdt_pic_decode_ic,
NULL
};
#endif
static device_method_t rt1310_intc_methods[] = {
DEVMETHOD(device_probe, rt1310_intc_probe),
DEVMETHOD(device_attach, rt1310_intc_attach),
#ifdef INTRNG
DEVMETHOD(pic_disable_intr, rt1310_disable_intr),
DEVMETHOD(pic_enable_intr, rt1310_enable_intr),
DEVMETHOD(pic_map_intr, rt1310_map_intr),
DEVMETHOD(pic_post_filter, rt1310_post_filter),
DEVMETHOD(pic_post_ithread, rt1310_post_ithread),
DEVMETHOD(pic_pre_ithread, rt1310_pre_ithread),
#endif
{ 0, 0 }
};
static driver_t rt1310_intc_driver = {
"pic",
rt1310_intc_methods,
sizeof(struct rt1310_intc_softc),
};
static devclass_t rt1310_intc_devclass;
EARLY_DRIVER_MODULE(pic, simplebus, rt1310_intc_driver, rt1310_intc_devclass, 0, 0, BUS_PASS_INTERRUPT);