Author: manu Date: Wed Apr 27 20:49:57 2016 New Revision: 298721 URL: https://svnweb.freebsd.org/changeset/base/298721
Log: Add support for the Non-maskable interrupt driver found in the Allwinner A20 and A31 SoCs. This is normally used for the PMU. Reviewed by: andrew Approved by: andrew (mentor) Differential Revision: https://reviews.freebsd.org/D5663 Added: head/sys/arm/allwinner/aw_nmi.c (contents, props changed) Modified: head/sys/arm/allwinner/files.allwinner Added: head/sys/arm/allwinner/aw_nmi.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/arm/allwinner/aw_nmi.c Wed Apr 27 20:49:57 2016 (r298721) @@ -0,0 +1,396 @@ +/*- + * Copyright (c) 2016 Emmanuel Vadot <m...@freebsd.org> + * 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/kernel.h> +#include <sys/module.h> +#include <sys/proc.h> +#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 <dt-bindings/interrupt-controller/irq.h> + +#include "pic_if.h" + +#define NMI_IRQ_CTRL_REG 0x0 +#define NMI_IRQ_LOW_LEVEL 0x0 +#define NMI_IRQ_LOW_EDGE 0x1 +#define NMI_IRQ_HIGH_LEVEL 0x2 +#define NMI_IRQ_HIGH_EDGE 0x3 +#define NMI_IRQ_PENDING_REG 0x4 +#define NMI_IRQ_ACK (1U << 0) +#define A20_NMI_IRQ_ENABLE_REG 0x8 +#define A31_NMI_IRQ_ENABLE_REG 0x34 +#define NMI_IRQ_ENABLE (1U << 0) + +#define SC_NMI_READ(_sc, _reg) bus_read_4(_sc->res[0], _reg) +#define SC_NMI_WRITE(_sc, _reg, _val) bus_write_4(_sc->res[0], _reg, _val) + +static struct resource_spec aw_nmi_res_spec[] = { + { SYS_RES_MEMORY, 0, RF_ACTIVE }, + { SYS_RES_IRQ, 0, RF_ACTIVE }, + { -1, 0, 0 } +}; + +struct aw_nmi_intr { + struct intr_irqsrc isrc; + u_int irq; + enum intr_polarity pol; + enum intr_trigger tri; +}; + +struct aw_nmi_softc { + device_t dev; + struct resource * res[2]; + void * intrcookie; + struct aw_nmi_intr intr; + uint8_t enable_reg; +}; + +#define A20_NMI 1 +#define A31_NMI 2 + +static struct ofw_compat_data compat_data[] = { + {"allwinner,sun7i-a20-sc-nmi", A20_NMI}, + {"allwinner,sun6i-a31-sc-nmi", A31_NMI}, + + {NULL, 0}, +}; + +static int +aw_nmi_intr(void *arg) +{ + struct aw_nmi_softc *sc; + + sc = arg; + + if (SC_NMI_READ(sc, NMI_IRQ_PENDING_REG) == 0) { + device_printf(sc->dev, "Spurious interrupt\n"); + return (FILTER_HANDLED); + } + + if (intr_isrc_dispatch(&sc->intr.isrc, curthread->td_intr_frame) != 0) { + SC_NMI_WRITE(sc, sc->enable_reg, !NMI_IRQ_ENABLE); + device_printf(sc->dev, "Stray interrupt, NMI disabled\n"); + } + + return (FILTER_HANDLED); +} + +static void +aw_nmi_enable_intr(device_t dev, struct intr_irqsrc *isrc) +{ + struct aw_nmi_softc *sc; + + sc = device_get_softc(dev); + + SC_NMI_WRITE(sc, sc->enable_reg, NMI_IRQ_ENABLE); +} + +static void +aw_nmi_disable_intr(device_t dev, struct intr_irqsrc *isrc) +{ + struct aw_nmi_softc *sc; + + sc = device_get_softc(dev); + + SC_NMI_WRITE(sc, sc->enable_reg, !NMI_IRQ_ENABLE); +} + +static int +aw_nmi_map_fdt(device_t dev, u_int ncells, pcell_t *cells, u_int *irqp, + enum intr_polarity *polp, enum intr_trigger *trigp) +{ + u_int irq, tripol; + enum intr_polarity pol; + enum intr_trigger trig; + + if (ncells != 2) { + device_printf(dev, "Invalid #interrupt-cells\n"); + return (EINVAL); + } + + irq = cells[0]; + if (irq != 0) { + device_printf(dev, "Controller only support irq 0\n"); + return (EINVAL); + } + + tripol = cells[1]; + + switch (tripol) { + case IRQ_TYPE_EDGE_RISING: + trig = INTR_TRIGGER_EDGE; + pol = INTR_POLARITY_HIGH; + break; + case IRQ_TYPE_EDGE_FALLING: + trig = INTR_TRIGGER_EDGE; + pol = INTR_POLARITY_LOW; + break; + case IRQ_TYPE_LEVEL_HIGH: + trig = INTR_TRIGGER_LEVEL; + pol = INTR_POLARITY_HIGH; + break; + case IRQ_TYPE_LEVEL_LOW: + trig = INTR_TRIGGER_LEVEL; + pol = INTR_POLARITY_LOW; + break; + default: + device_printf(dev, "unsupported trigger/polarity 0x%2x\n", + tripol); + return (ENOTSUP); + } + + *irqp = irq; + if (polp != NULL) + *polp = pol; + if (trigp != NULL) + *trigp = trig; + return (0); +} + +static int +aw_nmi_map_intr(device_t dev, struct intr_map_data *data, + struct intr_irqsrc **isrcp) +{ + struct aw_nmi_softc *sc; + int error; + u_int irq; + + sc = device_get_softc(dev); + if (data->type != INTR_MAP_DATA_FDT) + return (ENOTSUP); + + error = aw_nmi_map_fdt(dev, data->fdt.ncells, data->fdt.cells, &irq, + NULL, NULL); + if (error == 0) + *isrcp = &sc->intr.isrc; + + return (error); +} + +static int +aw_nmi_setup_intr(device_t dev, struct intr_irqsrc *isrc, + struct resource *res, struct intr_map_data *data) +{ + struct aw_nmi_softc *sc; + struct aw_nmi_intr *nmi_intr; + int error, icfg; + u_int irq; + enum intr_trigger trig; + enum intr_polarity pol; + + sc = device_get_softc(dev); + nmi_intr = (struct aw_nmi_intr *)isrc; + + /* Get config for interrupt. */ + if (data == NULL || data->type != INTR_MAP_DATA_FDT) + return (ENOTSUP); + error = aw_nmi_map_fdt(dev, data->fdt.ncells, data->fdt.cells, &irq, + &pol, &trig); + if (error != 0) + return (error); + if (nmi_intr->irq != irq) + return (EINVAL); + + /* Compare config if this is not first setup. */ + if (isrc->isrc_handlers != 0) { + if (pol != nmi_intr->pol || trig != nmi_intr->tri) + return (EINVAL); + else + return (0); + } + + nmi_intr->pol = pol; + nmi_intr->tri = trig; + + if (trig == INTR_TRIGGER_LEVEL) { + if (pol == INTR_POLARITY_LOW) + icfg = NMI_IRQ_LOW_LEVEL; + else + icfg = NMI_IRQ_HIGH_LEVEL; + } else { + if (pol == INTR_POLARITY_HIGH) + icfg = NMI_IRQ_HIGH_EDGE; + else + icfg = NMI_IRQ_LOW_EDGE; + } + + SC_NMI_WRITE(sc, NMI_IRQ_CTRL_REG, icfg); + + return (0); +} + +static int +aw_nmi_teardown_intr(device_t dev, struct intr_irqsrc *isrc, + struct resource *res, struct intr_map_data *data) +{ + struct aw_nmi_softc *sc; + + sc = device_get_softc(dev); + + if (isrc->isrc_handlers == 0) { + sc->intr.pol = INTR_POLARITY_CONFORM; + sc->intr.tri = INTR_TRIGGER_CONFORM; + + SC_NMI_WRITE(sc, sc->enable_reg, !NMI_IRQ_ENABLE); + } + + return (0); +} + +static void +aw_nmi_pre_ithread(device_t dev, struct intr_irqsrc *isrc) +{ + + aw_nmi_disable_intr(dev, isrc); +} + +static void +aw_nmi_post_ithread(device_t dev, struct intr_irqsrc *isrc) +{ + + arm_irq_memory_barrier(0); + aw_nmi_enable_intr(dev, isrc); +} + +static void +aw_nmi_post_filter(device_t dev, struct intr_irqsrc *isrc) +{ + struct aw_nmi_softc *sc; + + sc = device_get_softc(dev); + + arm_irq_memory_barrier(0); + SC_NMI_WRITE(sc, NMI_IRQ_PENDING_REG, NMI_IRQ_ACK); +} + +static int +aw_nmi_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, "Allwinner NMI Controller"); + return (BUS_PROBE_DEFAULT); +} + +static int +aw_nmi_attach(device_t dev) +{ + struct aw_nmi_softc *sc; + phandle_t xref; + + sc = device_get_softc(dev); + sc->dev = dev; + + if (bus_alloc_resources(dev, aw_nmi_res_spec, sc->res) != 0) { + device_printf(dev, "can't allocate device resources\n"); + return (ENXIO); + } + if ((bus_setup_intr(dev, sc->res[1], INTR_TYPE_MISC, + aw_nmi_intr, NULL, sc, &sc->intrcookie))) { + device_printf(dev, "unable to register interrupt handler\n"); + bus_release_resources(dev, aw_nmi_res_spec, sc->res); + return (ENXIO); + } + + switch (ofw_bus_search_compatible(dev, compat_data)->ocd_data) { + case A20_NMI: + sc->enable_reg = A20_NMI_IRQ_ENABLE_REG; + break; + case A31_NMI: + sc->enable_reg = A31_NMI_IRQ_ENABLE_REG; + break; + } + + /* Disable and clear interrupts */ + SC_NMI_WRITE(sc, sc->enable_reg, !NMI_IRQ_ENABLE); + SC_NMI_WRITE(sc, NMI_IRQ_PENDING_REG, NMI_IRQ_ACK); + + xref = OF_xref_from_node(ofw_bus_get_node(dev)); + /* Register our isrc */ + sc->intr.irq = 0; + sc->intr.pol = INTR_POLARITY_CONFORM; + sc->intr.tri = INTR_TRIGGER_CONFORM; + if (intr_isrc_register(&sc->intr.isrc, sc->dev, 0, "%s,%u", + device_get_nameunit(sc->dev), sc->intr.irq) != 0) + goto error; + + if (intr_pic_register(dev, (intptr_t)xref) != 0) { + device_printf(dev, "could not register pic\n"); + goto error; + } + return (0); + +error: + bus_teardown_intr(dev, sc->res[1], sc->intrcookie); + bus_release_resources(dev, aw_nmi_res_spec, sc->res); + return (ENXIO); +} + +static device_method_t aw_nmi_methods[] = { + DEVMETHOD(device_probe, aw_nmi_probe), + DEVMETHOD(device_attach, aw_nmi_attach), + + /* Interrupt controller interface */ + DEVMETHOD(pic_disable_intr, aw_nmi_disable_intr), + DEVMETHOD(pic_enable_intr, aw_nmi_enable_intr), + DEVMETHOD(pic_map_intr, aw_nmi_map_intr), + DEVMETHOD(pic_setup_intr, aw_nmi_setup_intr), + DEVMETHOD(pic_teardown_intr, aw_nmi_teardown_intr), + DEVMETHOD(pic_post_filter, aw_nmi_post_filter), + DEVMETHOD(pic_post_ithread, aw_nmi_post_ithread), + DEVMETHOD(pic_pre_ithread, aw_nmi_pre_ithread), + + {0, 0}, +}; + +static driver_t aw_nmi_driver = { + "aw_nmi", + aw_nmi_methods, + sizeof(struct aw_nmi_softc), +}; + +static devclass_t aw_nmi_devclass; + +EARLY_DRIVER_MODULE(aw_nmi, simplebus, aw_nmi_driver, + aw_nmi_devclass, 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LAST); Modified: head/sys/arm/allwinner/files.allwinner ============================================================================== --- head/sys/arm/allwinner/files.allwinner Wed Apr 27 20:24:48 2016 (r298720) +++ head/sys/arm/allwinner/files.allwinner Wed Apr 27 20:49:57 2016 (r298721) @@ -10,6 +10,7 @@ arm/allwinner/aw_usbphy.c optional ehci arm/allwinner/a10_gpio.c optional gpio arm/allwinner/a10_mmc.c optional mmc arm/allwinner/a10_sramc.c standard +arm/allwinner/aw_nmi.c optional intrng arm/allwinner/aw_if_dwc.c optional dwc arm/allwinner/aw_rtc.c standard arm/allwinner/aw_wdog.c standard _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
