/* $NetBSD: plgpio_acpi.c,v 1.7 2021/01/29 15:49:55 thorpej Exp $ */

/*-
* Copyright (c) 2018 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jared McNeill <[email protected]>.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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>
__KERNEL_RCSID(0, "$NetBSD: plgpio_acpi.c,v 1.7 2021/01/29 15:49:55 thorpej Exp $");

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/cpu.h>
#include <sys/device.h>
#include <sys/gpio.h>

#include <dev/acpi/acpireg.h>
#include <dev/acpi/acpivar.h>
#include <dev/acpi/acpi_intr.h>
#include <dev/acpi/acpi_event.h>

#include <dev/gpio/gpiovar.h>
#include <dev/ic/pl061var.h>
#include <dev/ic/pl061reg.h>

struct plgpio_acpi_softc;

struct plgpio_acpi_softc {
       struct plgpio_softc     sc_base;

       ACPI_HANDLE             sc_handle;

       struct acpi_event *     sc_event[8];
};

static int      plgpio_acpi_match(device_t, cfdata_t, void *);
static void     plgpio_acpi_attach(device_t, device_t, void *);

static void     plgpio_acpi_register_event(void *, struct acpi_event *, ACPI_RESOURCE_GPIO *);
static int      plgpio_acpi_intr(void *);

CFATTACH_DECL_NEW(plgpio_acpi, sizeof(struct plgpio_acpi_softc), plgpio_acpi_match, plgpio_acpi_attach, NULL, NULL);

static const struct device_compatible_entry compat_data[] = {
       { .compat = "ARMH0061" },
       DEVICE_COMPAT_EOL
};

static int
plgpio_acpi_match(device_t parent, cfdata_t cf, void *aux)
{
       struct acpi_attach_args *aa = aux;

       return acpi_compatible_match(aa, compat_data);
}

static void
plgpio_acpi_attach(device_t parent, device_t self, void *aux)
{
       struct plgpio_acpi_softc * const asc = device_private(self);
       struct plgpio_softc * const sc = &asc->sc_base;
       struct acpi_attach_args *aa = aux;
       struct acpi_resources res;
       struct acpi_mem *mem;
       struct acpi_irq *irq;
       ACPI_STATUS rv;
       int error;
       void *ih;

       sc->sc_dev = self;
       asc->sc_handle = aa->aa_node->ad_handle;

       rv = acpi_resource_parse(sc->sc_dev, aa->aa_node->ad_handle, "_CRS",
           &res, &acpi_resource_parse_ops_default);
       if (ACPI_FAILURE(rv))
               return;

       mem = acpi_res_mem(&res, 0);
       if (mem == NULL) {
               aprint_error_dev(self, "couldn't find mem resource\n");
               goto done;
       }

       irq = acpi_res_irq(&res, 0);
       if (irq == NULL) {
               aprint_error_dev(self, "couldn't find irq resource\n");
               goto done;
       }

       sc->sc_dev = self;
       sc->sc_bst = aa->aa_memt;
       error = bus_space_map(sc->sc_bst, mem->ar_base, mem->ar_length, 0, &sc->sc_bsh);
       if (error) {
               aprint_error_dev(self, "couldn't map registers\n");
               return;
       }

       plgpio_attach(sc);

       rv = acpi_event_create_gpio(self, asc->sc_handle, plgpio_acpi_register_event, asc);
       if (ACPI_FAILURE(rv)) {
               if (rv != AE_NOT_FOUND)
                       aprint_error_dev(self, "failed to create events: %s\n", AcpiFormatException(rv));
               goto done;
       }

       ih = acpi_intr_establish(self,
           (uint64_t)(uintptr_t)asc->sc_handle,
           IPL_VM, false, plgpio_acpi_intr, asc, device_xname(self));
       if (ih == NULL)
               aprint_error_dev(self, "couldn't establish interrupt\n");

done:
       acpi_resource_cleanup(&res);
}

static void
plgpio_acpi_register_event(void *priv, struct acpi_event *ev, ACPI_RESOURCE_GPIO *gpio)
{
       struct plgpio_acpi_softc * const asc = priv;
       struct plgpio_softc * const sc = &asc->sc_base;
       uint32_t ibe, iev, is, ie;

       const int pin = gpio->PinTable[0];

       if (pin >= __arraycount(asc->sc_event)) {
               aprint_error_dev(asc->sc_base.sc_dev,
                   "ignoring event for pin %u (out of range)\n", pin);
               return;
       }
       if (asc->sc_event[pin] != NULL) {
               aprint_error_dev(asc->sc_base.sc_dev,
                   "ignoring duplicate pin %u\n", pin);
               return;
       }

       asc->sc_event[pin] = ev;
       asc->sc_base.sc_reserved_mask |= __BIT(pin);

       /*
        * Configure and enable interrupts for this pin.
        */

       ibe = PLGPIO_READ(sc, PL061_GPIOIBE_REG);
       iev = PLGPIO_READ(sc, PL061_GPIOIEV_REG);
       switch (gpio->Polarity) {
       case ACPI_ACTIVE_HIGH:
               ibe &= ~__BIT(pin);
               iev |= __BIT(pin);
               break;
       case ACPI_ACTIVE_LOW:
               ibe &= ~__BIT(pin);
               iev &= ~__BIT(pin);
               break;
       case ACPI_ACTIVE_BOTH:
               ibe |= __BIT(pin);
               break;
       }
       PLGPIO_WRITE(sc, PL061_GPIOIBE_REG, ibe);
       PLGPIO_WRITE(sc, PL061_GPIOIEV_REG, iev);

       is = PLGPIO_READ(sc, PL061_GPIOIS_REG);
       switch (gpio->Triggering) {
       case ACPI_LEVEL_SENSITIVE:
               is |= __BIT(pin);
               break;
       case ACPI_EDGE_SENSITIVE:
               is &= ~__BIT(pin);
               break;
       }
       PLGPIO_WRITE(sc, PL061_GPIOIS_REG, is);

       delay(20);

       PLGPIO_WRITE(sc, PL061_GPIOIC_REG, __BIT(pin));

       ie = PLGPIO_READ(sc, PL061_GPIOIE_REG);
       ie |= __BIT(pin);
       PLGPIO_WRITE(sc, PL061_GPIOIE_REG, ie);
}

static int
plgpio_acpi_intr(void *priv)
{
       struct plgpio_acpi_softc * const asc = priv;
       struct plgpio_softc * const sc = &asc->sc_base;
       uint32_t mis;
       int bit;

       mis = PLGPIO_READ(sc, PL061_GPIOMIS_REG);
       PLGPIO_WRITE(sc, PL061_GPIOIC_REG, mis);

       while ((bit = __builtin_ffs(mis)) != 0) {
               const int pin = bit - 1;
               struct acpi_event * const ev = asc->sc_event[pin];
               KASSERT(ev != NULL);

               acpi_event_notify(ev);

               mis &= ~__BIT(pin);
       }

       return 1;
}

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