freebsd-dev/sys/powerpc/mpc85xx/atpic.c
Marcel Moolenaar 591dea8c59 Mark the cascaded AT interrupt handler as MP safe to avoid having
it grab Giant. The next step would be to make it a filter.
2009-05-31 01:56:06 +00:00

331 lines
8.1 KiB
C

/*-
* Copyright (c) 2009 Marcel Moolenaar
*
* 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 ``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 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/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <machine/intr.h>
#include <machine/intr_machdep.h>
#include <machine/pio.h>
#include <powerpc/mpc85xx/ocpbus.h>
#include <dev/ic/i8259.h>
#include <isa/isareg.h>
#include <isa/isavar.h>
#include "pic_if.h"
#define ATPIC_MASTER 0
#define ATPIC_SLAVE 1
struct atpic_softc {
device_t sc_dev;
/* I/O port resources for master & slave. */
struct resource *sc_res[2];
int sc_rid[2];
/* Our "routing" interrupt */
struct resource *sc_ires;
void *sc_icookie;
int sc_irid;
int sc_vector[16];
uint8_t sc_mask[2];
};
static int atpic_isa_attach(device_t);
static void atpic_isa_identify(driver_t *, device_t);
static int atpic_isa_probe(device_t);
static void atpic_config(device_t, u_int, enum intr_trigger,
enum intr_polarity);
static void atpic_dispatch(device_t, struct trapframe *);
static void atpic_enable(device_t, u_int, u_int);
static void atpic_eoi(device_t, u_int);
static void atpic_ipi(device_t, u_int);
static void atpic_mask(device_t, u_int);
static void atpic_unmask(device_t, u_int);
static device_method_t atpic_isa_methods[] = {
/* Device interface */
DEVMETHOD(device_identify, atpic_isa_identify),
DEVMETHOD(device_probe, atpic_isa_probe),
DEVMETHOD(device_attach, atpic_isa_attach),
/* PIC interface */
DEVMETHOD(pic_config, atpic_config),
DEVMETHOD(pic_dispatch, atpic_dispatch),
DEVMETHOD(pic_enable, atpic_enable),
DEVMETHOD(pic_eoi, atpic_eoi),
DEVMETHOD(pic_ipi, atpic_ipi),
DEVMETHOD(pic_mask, atpic_mask),
DEVMETHOD(pic_unmask, atpic_unmask),
{ 0, 0 },
};
static driver_t atpic_isa_driver = {
"atpic",
atpic_isa_methods,
sizeof(struct atpic_softc)
};
static devclass_t atpic_devclass;
DRIVER_MODULE(atpic, isa, atpic_isa_driver, atpic_devclass, 0, 0);
static struct isa_pnp_id atpic_ids[] = {
{ 0x0000d041 /* PNP0000 */, "AT interrupt controller" },
{ 0 }
};
static __inline uint8_t
atpic_read(struct atpic_softc *sc, int icu, int ofs)
{
uint8_t val;
val = bus_read_1(sc->sc_res[icu], ofs);
return (val);
}
static __inline void
atpic_write(struct atpic_softc *sc, int icu, int ofs, uint8_t val)
{
bus_write_1(sc->sc_res[icu], ofs, val);
bus_barrier(sc->sc_res[icu], ofs, 2 - ofs,
BUS_SPACE_BARRIER_READ|BUS_SPACE_BARRIER_WRITE);
}
static void
atpic_intr(void *arg)
{
atpic_dispatch(pic8259, arg);
}
static void
atpic_isa_identify(driver_t *drv, device_t parent)
{
device_t child;
child = BUS_ADD_CHILD(parent, ISA_ORDER_SENSITIVE, drv->name, -1);
device_set_driver(child, drv);
isa_set_logicalid(child, atpic_ids[0].ip_id);
isa_set_vendorid(child, atpic_ids[0].ip_id);
bus_set_resource(child, SYS_RES_IOPORT, ATPIC_MASTER, IO_ICU1, 2);
bus_set_resource(child, SYS_RES_IOPORT, ATPIC_SLAVE, IO_ICU2, 2);
/* ISA interrupts are routed through external interrupt 0. */
bus_set_resource(child, SYS_RES_IRQ, 0, PIC_IRQ_EXT(0), 1);
}
static int
atpic_isa_probe(device_t dev)
{
int res;
res = ISA_PNP_PROBE(device_get_parent(dev), dev, atpic_ids);
if (res > 0)
return (res);
device_set_desc(dev, "PC/AT compatible PIC");
return (res);
}
static void
atpic_init(struct atpic_softc *sc, int icu)
{
sc->sc_mask[icu] = 0xff - ((icu == ATPIC_MASTER) ? 4 : 0);
atpic_write(sc, icu, 0, ICW1_RESET | ICW1_IC4);
atpic_write(sc, icu, 1, (icu == ATPIC_SLAVE) ? 8 : 0);
atpic_write(sc, icu, 1, (icu == ATPIC_SLAVE) ? 2 : 4);
atpic_write(sc, icu, 1, ICW4_8086);
atpic_write(sc, icu, 1, sc->sc_mask[icu]);
atpic_write(sc, icu, 0, OCW3_SEL | OCW3_RR);
}
static int
atpic_isa_attach(device_t dev)
{
struct atpic_softc *sc;
int error;
sc = device_get_softc(dev);
sc->sc_dev = dev;
error = ENXIO;
sc->sc_rid[ATPIC_MASTER] = 0;
sc->sc_res[ATPIC_MASTER] = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
&sc->sc_rid[ATPIC_MASTER], RF_ACTIVE);
if (sc->sc_res[ATPIC_MASTER] == NULL)
goto fail;
sc->sc_rid[ATPIC_SLAVE] = 1;
sc->sc_res[ATPIC_SLAVE] = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
&sc->sc_rid[ATPIC_SLAVE], RF_ACTIVE);
if (sc->sc_res[ATPIC_SLAVE] == NULL)
goto fail;
sc->sc_irid = 0;
sc->sc_ires = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->sc_irid,
RF_ACTIVE);
if (sc->sc_ires == NULL)
goto fail;
error = bus_setup_intr(dev, sc->sc_ires, INTR_TYPE_MISC | INTR_MPSAFE,
NULL, atpic_intr, NULL, &sc->sc_icookie);
if (error)
goto fail;
atpic_init(sc, ATPIC_SLAVE);
atpic_init(sc, ATPIC_MASTER);
powerpc_register_8259(dev);
return (0);
fail:
if (sc->sc_ires != NULL)
bus_release_resource(dev, SYS_RES_IRQ, sc->sc_irid,
sc->sc_ires);
if (sc->sc_res[ATPIC_SLAVE] != NULL)
bus_release_resource(dev, SYS_RES_IOPORT,
sc->sc_rid[ATPIC_SLAVE], sc->sc_res[ATPIC_SLAVE]);
if (sc->sc_res[ATPIC_MASTER] != NULL)
bus_release_resource(dev, SYS_RES_IOPORT,
sc->sc_rid[ATPIC_MASTER], sc->sc_res[ATPIC_MASTER]);
return (error);
}
/*
* PIC interface.
*/
static void
atpic_config(device_t dev, u_int irq, enum intr_trigger trig,
enum intr_polarity pol)
{
}
static void
atpic_dispatch(device_t dev, struct trapframe *tf)
{
struct atpic_softc *sc;
uint8_t irq;
sc = device_get_softc(dev);
atpic_write(sc, ATPIC_MASTER, 0, OCW3_SEL | OCW3_P);
irq = atpic_read(sc, ATPIC_MASTER, 0);
atpic_write(sc, ATPIC_MASTER, 0, OCW3_SEL | OCW3_RR);
if ((irq & 0x80) == 0)
return;
if (irq == 0x82) {
atpic_write(sc, ATPIC_SLAVE, 0, OCW3_SEL | OCW3_P);
irq = atpic_read(sc, ATPIC_SLAVE, 0) + 8;
atpic_write(sc, ATPIC_SLAVE, 0, OCW3_SEL | OCW3_RR);
if ((irq & 0x80) == 0)
return;
}
powerpc_dispatch_intr(sc->sc_vector[irq & 0x0f], tf);
}
static void
atpic_enable(device_t dev, u_int irq, u_int vector)
{
struct atpic_softc *sc;
sc = device_get_softc(dev);
sc->sc_vector[irq] = vector;
atpic_unmask(dev, irq);
}
static void
atpic_eoi(device_t dev, u_int irq)
{
struct atpic_softc *sc;
sc = device_get_softc(dev);
if (irq > 7)
atpic_write(sc, ATPIC_SLAVE, 0, OCW2_EOI);
atpic_write(sc, ATPIC_MASTER, 0, OCW2_EOI);
}
static void
atpic_ipi(device_t dev, u_int cpu)
{
/* No SMP support. */
}
static void
atpic_mask(device_t dev, u_int irq)
{
struct atpic_softc *sc;
sc = device_get_softc(dev);
if (irq > 7) {
sc->sc_mask[ATPIC_SLAVE] |= 1 << (irq - 8);
atpic_write(sc, ATPIC_SLAVE, 1, sc->sc_mask[ATPIC_SLAVE]);
atpic_write(sc, ATPIC_SLAVE, 0, OCW2_EOI);
} else {
sc->sc_mask[ATPIC_MASTER] |= 1 << irq;
atpic_write(sc, ATPIC_MASTER, 1, sc->sc_mask[ATPIC_MASTER]);
}
atpic_write(sc, ATPIC_MASTER, 0, OCW2_EOI);
}
static void
atpic_unmask(device_t dev, u_int irq)
{
struct atpic_softc *sc;
sc = device_get_softc(dev);
if (irq > 7) {
sc->sc_mask[ATPIC_SLAVE] &= ~(1 << (irq - 8));
atpic_write(sc, ATPIC_SLAVE, 1, sc->sc_mask[ATPIC_SLAVE]);
} else {
sc->sc_mask[ATPIC_MASTER] &= ~(1 << irq);
atpic_write(sc, ATPIC_MASTER, 1, sc->sc_mask[ATPIC_MASTER]);
}
}