Differential D5663 Diff 15628 sys/arm/allwinner/aw_nmi.c

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sys/arm/allwinner/aw_nmi.c

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				/*-
				* Copyright (c) 2016 Emmanuel Vadot <manu@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>

				jmcneillUnsubmitted Done Inline Actions I think you can include <dt-bindings/interrupt-controller/irq.h> here instead? jmcneill: I think you can include <dt-bindings/interrupt-controller/irq.h> here instead?
				#ifdef INTRNG

				#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");
				andrewUnsubmitted Done Inline Actions The indentation looks off, it should be tabbed, then 4 spaces. andrew: The indentation looks off, it should be tabbed, then 4 spaces.
				}

				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)
				{
				struct aw_nmi_softc *sc;
				u_int irq, tripol;
				enum intr_polarity pol;
				enum intr_trigger trig;

				sc = device_get_softc(dev);
				andrewUnsubmitted Done Inline Actions Is `sc` used other than to get `dev`? andrew: Is `sc` used other than to get `dev`?

				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;
				andrewUnsubmitted Not Done Inline Actions It fells like we could pull this out to a common function (in a future change). andrew: It fells like we could pull this out to a common function (in a future change).
				default:
				device_printf(sc->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);
				jmcneillUnsubmitted Done Inline Actions There's already an '#ifdef ARM_INTRNG' on line 48 jmcneill: There's already an '#ifdef ARM_INTRNG' on line 48

				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);

				#endif /* INTRNG */