/* $NetBSD: argpio.c,v 1.10 2021/08/07 16:18:58 thorpej Exp $ */

/*-
* Copyright (c) 2006 Garrett D'Amore
* All rights reserved.
*
* Written by Garrett D'Amore.
*
* 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: argpio.c,v 1.10 2021/08/07 16:18:58 thorpej Exp $");

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/gpio.h>
#include <sys/intr.h>
#include <sys/kernel.h>
#include <sys/types.h>

#include <mips/atheros/include/arbusvar.h>

#include <dev/gpio/gpiovar.h>
#include <dev/sysmon/sysmonvar.h>
#include <dev/sysmon/sysmon_taskq.h>

#include <mips/atheros/dev/argpioreg.h>

/*
* General Plan:
*
* Register GPIOs for all pins that are _not_ associated with the reset
* pin.  (Possibly also not the system LED.)
*/

struct argpio_softc {
       device_t                sc_dev;
       struct gpio_chipset_tag sc_gc;
       gpio_pin_t              sc_pins[ARGPIO_NPINS];
       int                     sc_npins;
       bus_space_tag_t         sc_st;
       bus_space_handle_t      sc_sh;
       bus_size_t              sc_size;
       int                     sc_caps;
       struct sysmon_pswitch   sc_resetbtn;
       void                    *sc_ih;
       int                     sc_rstpin;
       int                     sc_ledpin;
};

static int argpio_match(device_t, cfdata_t, void *);
static void argpio_attach(device_t, device_t, void *);
static int argpio_intr(void *);
static void argpio_reset_pressed(void *);
static void argpio_ctl(void *, int, int);
static void argpio_write(void *, int, int);
static int argpio_read(void *, int);

CFATTACH_DECL_NEW(argpio, sizeof (struct argpio_softc), argpio_match,
   argpio_attach, NULL, NULL);

#define INPUT(pin)      (1 << (pin))            /* input bit */
#define INTR(pin)       (1 << ((pin) + 8))      /* interrupt bit */
#define SERIAL(pin)     (1 << ((pin) + 16))     /* serial mux bit */

#define GETREG(sc, o)           bus_space_read_4(sc->sc_st, sc->sc_sh, o)
#define PUTREG(sc, o, v)        bus_space_write_4(sc->sc_st, sc->sc_sh, o, v)
#define FLUSH(sc)               bus_space_barrier(sc->sc_st, sc->sc_sh, \
                               0, 12, BUS_SPACE_BARRIER_READ|BUS_SPACE_BARRIER_WRITE)

int
argpio_match(device_t parent, cfdata_t match, void *aux)
{
       struct arbus_attach_args *aa = aux;

       return ((strcmp(aa->aa_name, "argpio") == 0) ? 1 : 0);
}

void
argpio_attach(device_t parent, device_t self, void *aux)
{
       struct argpio_softc *sc = device_private(self);
       struct arbus_attach_args *aa = aux;
       struct gpiobus_attach_args gba;
       prop_number_t   pn;
       int i;
       uint32_t reg;

       sc->sc_dev = self;
       sc->sc_st = aa->aa_bst;
       sc->sc_npins = ARGPIO_NPINS;
       sc->sc_size = aa->aa_size;
       sc->sc_ledpin = -1;
       sc->sc_rstpin = -1;

       if (bus_space_map(sc->sc_st, aa->aa_addr, sc->sc_size, 0,
               &sc->sc_sh) != 0) {
               printf(": unable to map registers!\n");
               return;
       }

       sc->sc_gc.gp_cookie = sc;
       sc->sc_gc.gp_pin_read = argpio_read;
       sc->sc_gc.gp_pin_write = argpio_write;
       sc->sc_gc.gp_pin_ctl = argpio_ctl;

       aprint_normal(": Atheros AR531X GPIO");
       pn = prop_dictionary_get(device_properties(sc->sc_dev), "reset-pin");
       if (pn != NULL) {
               KASSERT(prop_object_type(pn) == PROP_TYPE_NUMBER);
               sc->sc_rstpin = (int)prop_number_integer_value(pn);
               aprint_normal(", reset button pin %d", sc->sc_rstpin);
       }
       pn = prop_dictionary_get(device_properties(sc->sc_dev), "sysled-pin");
       if (pn != NULL) {
               KASSERT(prop_object_type(pn) == PROP_TYPE_NUMBER);
               sc->sc_ledpin = (int)prop_number_integer_value(pn);
               aprint_normal(", system led pin %d", sc->sc_ledpin);
       }

       aprint_normal("\n");

       if (sc->sc_ledpin) {
               sc->sc_ih = arbus_intr_establish(aa->aa_cirq, aa->aa_mirq,
                   argpio_intr, sc);
               if (sc->sc_ih == NULL) {
                       aprint_error_dev(sc->sc_dev,
                           "couldn't establish interrupt\n");
               }
       }

       if (sc->sc_ih) {
               sysmon_task_queue_init();

               sc->sc_resetbtn.smpsw_name = device_xname(sc->sc_dev);
               sc->sc_resetbtn.smpsw_type = PSWITCH_TYPE_RESET;
               if (sysmon_pswitch_register(&sc->sc_resetbtn) != 0) {
                       aprint_normal_dev(sc->sc_dev,
                           "unable to register reset button\n");
               }
       }

       reg = GETREG(sc, GPIO_CR);

       for (i = 0; i < sc->sc_npins; i++) {
               gpio_pin_t      *pp;

               pp = &sc->sc_pins[i];

               if (i == sc->sc_rstpin) {
                       /* configure as interrupt for reset */
                       pp->pin_caps = GPIO_PIN_INPUT;
                       reg &= ~SERIAL(i);
                       reg |= INPUT(i);
                       /* only if we were able to set up the handler, tho' */
                       if (sc->sc_ih != NULL)
                               reg |= INTR(i);

               } else if (i == sc->sc_ledpin) {
                       /* configure as output for LED */
                       pp->pin_caps = GPIO_PIN_OUTPUT;
                       reg &= ~SERIAL(i);
                       reg &= ~INPUT(i);
                       reg &= ~INTR(i);

               } else {
                       if (reg & SERIAL(i)) {
                               /* pin multiplexed with serial bit */
                               pp->pin_caps = 0;
                       } else {
                               pp->pin_caps = GPIO_PIN_INPUT |
                                   GPIO_PIN_OUTPUT;
                       }
               }
       }

       PUTREG(sc, GPIO_CR, reg);
       FLUSH(sc);

       gba.gba_gc = &sc->sc_gc;
       gba.gba_pins = sc->sc_pins;
       gba.gba_npins = sc->sc_npins;
       config_found(sc->sc_dev, &gba, gpiobus_print, CFARGS_NONE);
}

void
argpio_ctl(void *arg, int pin, int flags)
{
       struct argpio_softc     *sc = arg;
       uint32_t                reg;

       reg = GETREG(sc, GPIO_CR);
       if (reg & (SERIAL(pin) | INTR(pin))) {
               printf("pin %d cannot be changed!\n", pin);
               /* don't allow changes to these bits */
               return;
       }
       if (flags & GPIO_PIN_INPUT) {
               reg |= INPUT(pin);
       } else {
               reg &= ~INPUT(pin);
       }

       PUTREG(sc, GPIO_CR, reg);
       FLUSH(sc);
}

void
argpio_write(void *arg, int pin, int value)
{
       struct argpio_softc     *sc = arg;
       uint32_t                reg;

       reg = GETREG(sc, GPIO_DO);
       if (value)
               reg &= ~(1 << pin);
       else
               reg |= (1 << pin);
       PUTREG(sc, GPIO_DO, reg);
       FLUSH(sc);
}

int
argpio_read(void *arg, int pin)
{
       struct argpio_softc     *sc = arg;

       return ((GETREG(sc, GPIO_DI) & (1 << pin)) ?
           GPIO_PIN_HIGH : GPIO_PIN_LOW);
}

void
argpio_reset_pressed(void *arg)
{
       struct argpio_softc     *sc = arg;
       int                     x;

       sysmon_pswitch_event(&sc->sc_resetbtn, PSWITCH_EVENT_PRESSED);

       /* reenable the interrupt */
       x = splhigh();
       PUTREG(sc, GPIO_CR,
           GETREG(sc, GPIO_CR) | INTR(sc->sc_rstpin));
       splx(x);
}

int
argpio_intr(void  *arg)
{
       struct argpio_softc     *sc = arg;

       if (sc->sc_rstpin < 0)
               return 0;

       /* this is an edge triggered interrupt, so disable it for now */
       PUTREG(sc, GPIO_CR, GETREG(sc, GPIO_CR) & ~INTR(sc->sc_rstpin));

       /* no other interrupt on this, so we have to claim it */
       sysmon_task_queue_sched(0, argpio_reset_pressed, sc);

       return 1;
}

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