diff options
Diffstat (limited to 'sys/powerpc/powermac/hrowpic.c')
| -rw-r--r-- | sys/powerpc/powermac/hrowpic.c | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/sys/powerpc/powermac/hrowpic.c b/sys/powerpc/powermac/hrowpic.c new file mode 100644 index 000000000000..cd1a1f17694f --- /dev/null +++ b/sys/powerpc/powermac/hrowpic.c @@ -0,0 +1,278 @@ +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * 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. + */ + +/* + * 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 + * This was superseded by an OpenPIC in the Keylargo and beyond + * MacIO versions.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_machdep.h> +#include <machine/md_var.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, void **); +static void hrowpic_eoi(device_t, u_int, void *); +static void hrowpic_ipi(device_t, u_int); +static void hrowpic_mask(device_t, u_int, void *); +static void hrowpic_unmask(device_t, u_int, void *); + +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_ipi, hrowpic_ipi), + DEVMETHOD(pic_mask, hrowpic_mask), + DEVMETHOD(pic_unmask, hrowpic_unmask), + + { 0, 0 }, +}; + +static driver_t hrowpic_driver = { + "hrowpic", + hrowpic_methods, + sizeof(struct hrowpic_softc) +}; + +DRIVER_MODULE(hrowpic, macio, hrowpic_driver, 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, ofw_bus_get_node(dev), 64, 0, FALSE); + 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")); + + /* + * Humor the SMP layer if it wants to set up an IPI handler. + */ + if (irq == HROWPIC_IRQMAX) + return; + + /* + * 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, void **priv __unused) +{ + 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, u_int irq, void *priv __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_ipi(device_t dev, u_int irq) +{ + /* No SMP support. */ +} + +static void +hrowpic_mask(device_t dev, u_int irq, void *priv __unused) +{ + struct hrowpic_softc *sc; + + sc = device_get_softc(dev); + hrowpic_toggle_irq(sc, irq, 0); +} + +static void +hrowpic_unmask(device_t dev, u_int irq, void *priv __unused) +{ + struct hrowpic_softc *sc; + + sc = device_get_softc(dev); + hrowpic_toggle_irq(sc, irq, 1); +} |