freebsd-dev/sys/powerpc/powermac/hrowpic.c
Marcel Moolenaar 77d40ffd98 Revamp the interrupt handling in support of INTR_FILTER. This includes:
o  Revamp the PIC I/F to only abstract the PIC hardware. The
   resource handling has been moved to nexus, where it belongs.
o  Include EOI and MASK+EOI methods to the PIC I/F in support of
   INTR_FILTER.
o  With the allocation of interrupt resources and setup of
   interrupt handlers in the common platform code we can delay
   talking to the PIC hardware after enumeration of all devices.
   Introduce a call to powerpc_intr_enable() in configure_final()
   to achieve that and have powerpc_setup_intr() only program the
   PIC when !cold.
o  As a consequence of the above, remove all early_attach() glue
   from the OpenPIC and Heathrow PIC drivers and have them
   register themselves when they're found during enumeration.
o  Decouple the interrupt vector from the interrupt request line.
   Allocate vectors increasingly so that they can be used for
   the intrcnt index as well. Extend the Heathrow PIC driver to
   translate between IRQ and vector. The OpenPIC driver already
   has the support for vectors in hardware.

Approved by: re (blanket)
2007-08-11 19:25:32 +00:00

272 lines
6.7 KiB
C

/*-
* Copyright 2003 by Peter Grehan. 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.
* 3. 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 ``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.
*
* $FreeBSD$
*/
/*
* A driver for the PIC found in the Heathrow/Paddington MacIO chips.
* This was superseded by an OpenPIC in the Keylargo and beyond
* MacIO versions.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/rman.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/openfirm.h>
#include <machine/bus.h>
#include <machine/intr.h>
#include <machine/intr_machdep.h>
#include <machine/md_var.h>
#include <machine/nexusvar.h>
#include <machine/pio.h>
#include <machine/resource.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <powerpc/powermac/hrowpicvar.h>
#include "pic_if.h"
/*
* MacIO interface
*/
static int hrowpic_probe(device_t);
static int hrowpic_attach(device_t);
static void hrowpic_dispatch(device_t, struct trapframe *);
static void hrowpic_enable(device_t, u_int, u_int);
static void hrowpic_eoi(device_t, u_int);
static void hrowpic_mask(device_t, u_int);
static void hrowpic_unmask(device_t, u_int);
static device_method_t hrowpic_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, hrowpic_probe),
DEVMETHOD(device_attach, hrowpic_attach),
/* PIC interface */
DEVMETHOD(pic_dispatch, hrowpic_dispatch),
DEVMETHOD(pic_enable, hrowpic_enable),
DEVMETHOD(pic_eoi, hrowpic_eoi),
DEVMETHOD(pic_mask, hrowpic_mask),
DEVMETHOD(pic_unmask, hrowpic_unmask),
{ 0, 0 },
};
static driver_t hrowpic_driver = {
"hrowpic",
hrowpic_methods,
sizeof(struct hrowpic_softc)
};
static devclass_t hrowpic_devclass;
DRIVER_MODULE(hrowpic, macio, hrowpic_driver, hrowpic_devclass, 0, 0);
static uint32_t
hrowpic_read_reg(struct hrowpic_softc *sc, u_int reg, u_int bank)
{
if (bank == HPIC_PRIMARY)
reg += HPIC_1ST_OFFSET;
return (bus_space_read_4(sc->sc_bt, sc->sc_bh, reg));
}
static void
hrowpic_write_reg(struct hrowpic_softc *sc, u_int reg, u_int bank,
uint32_t val)
{
if (bank == HPIC_PRIMARY)
reg += HPIC_1ST_OFFSET;
bus_space_write_4(sc->sc_bt, sc->sc_bh, reg, val);
/* XXX Issue a read to force the write to complete. */
bus_space_read_4(sc->sc_bt, sc->sc_bh, reg);
}
static int
hrowpic_probe(device_t dev)
{
const char *type = ofw_bus_get_type(dev);
/*
* OpenPIC cells have a type of "open-pic", so this
* is sufficient to identify a Heathrow cell
*/
if (strcmp(type, "interrupt-controller") != 0)
return (ENXIO);
/*
* The description was already printed out in the nexus
* probe, so don't do it again here
*/
device_set_desc(dev, "Heathrow MacIO interrupt controller");
return (0);
}
static int
hrowpic_attach(device_t dev)
{
struct hrowpic_softc *sc;
sc = device_get_softc(dev);
sc->sc_dev = dev;
sc->sc_rrid = 0;
sc->sc_rres = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->sc_rrid,
RF_ACTIVE);
if (sc->sc_rres == NULL) {
device_printf(dev, "Could not alloc mem resource!\n");
return (ENXIO);
}
sc->sc_bt = rman_get_bustag(sc->sc_rres);
sc->sc_bh = rman_get_bushandle(sc->sc_rres);
/*
* Disable all interrupt sources and clear outstanding interrupts
*/
hrowpic_write_reg(sc, HPIC_ENABLE, HPIC_PRIMARY, 0);
hrowpic_write_reg(sc, HPIC_CLEAR, HPIC_PRIMARY, 0xffffffff);
hrowpic_write_reg(sc, HPIC_ENABLE, HPIC_SECONDARY, 0);
hrowpic_write_reg(sc, HPIC_CLEAR, HPIC_SECONDARY, 0xffffffff);
powerpc_register_pic(dev);
return (0);
}
/*
* Local routines
*/
static void
hrowpic_toggle_irq(struct hrowpic_softc *sc, int irq, int enable)
{
u_int roffset;
u_int rbit;
KASSERT((irq > 0) && (irq < HROWPIC_IRQMAX), ("en irq out of range"));
/*
* Calculate prim/sec register bank for the IRQ, update soft copy,
* and enable the IRQ as an interrupt source
*/
roffset = HPIC_INT_TO_BANK(irq);
rbit = HPIC_INT_TO_REGBIT(irq);
if (enable)
sc->sc_softreg[roffset] |= (1 << rbit);
else
sc->sc_softreg[roffset] &= ~(1 << rbit);
hrowpic_write_reg(sc, HPIC_ENABLE, roffset, sc->sc_softreg[roffset]);
}
/*
* PIC I/F methods.
*/
static void
hrowpic_dispatch(device_t dev, struct trapframe *tf)
{
struct hrowpic_softc *sc;
uint64_t mask;
uint32_t reg;
u_int irq;
sc = device_get_softc(dev);
while (1) {
mask = hrowpic_read_reg(sc, HPIC_STATUS, HPIC_SECONDARY);
reg = hrowpic_read_reg(sc, HPIC_STATUS, HPIC_PRIMARY);
mask = (mask << 32) | reg;
if (mask == 0)
break;
irq = 0;
while (irq < HROWPIC_IRQMAX) {
if (mask & 1)
powerpc_dispatch_intr(sc->sc_vector[irq], tf);
mask >>= 1;
irq++;
}
}
}
static void
hrowpic_enable(device_t dev, u_int irq, u_int vector)
{
struct hrowpic_softc *sc;
sc = device_get_softc(dev);
sc->sc_vector[irq] = vector;
hrowpic_toggle_irq(sc, irq, 1);
}
static void
hrowpic_eoi(device_t dev __unused, u_int irq __unused)
{
struct hrowpic_softc *sc;
int bank;
sc = device_get_softc(dev);
bank = (irq >= 32) ? HPIC_SECONDARY : HPIC_PRIMARY ;
hrowpic_write_reg(sc, HPIC_CLEAR, bank, 1U << (irq & 0x1f));
}
static void
hrowpic_mask(device_t dev, u_int irq)
{
struct hrowpic_softc *sc;
int bank;
sc = device_get_softc(dev);
hrowpic_toggle_irq(sc, irq, 0);
bank = (irq >= 32) ? HPIC_SECONDARY : HPIC_PRIMARY ;
hrowpic_write_reg(sc, HPIC_CLEAR, bank, 1U << (irq & 0x1f));
}
static void
hrowpic_unmask(device_t dev, u_int irq)
{
struct hrowpic_softc *sc;
sc = device_get_softc(dev);
hrowpic_toggle_irq(sc, irq, 1);
}