/* $NetBSD: ibmcd.c,v 1.5 2021/08/07 16:19:14 thorpej Exp $ */

/*
* Copyright (c) 2012 Marc Balmer <[email protected]>
* 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 ``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.
*/

/*
* Driver for the IBM 4810 BSP cash drawer port.
*/

#include <sys/types.h>
#include <sys/param.h>
#include <sys/device.h>
#include <sys/gpio.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/systm.h>

#include <dev/gpio/gpiovar.h>

#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcidevs.h>

/* registers */
#define IBMCD_STATUS            0x00
#define IBMCD_CONTROL           0x01

#define IBMCD_CMD_OPEN          0x6d
#define IBMCD_DO_OPEN           0x01

#define IBMCD_CLOSED            0x80
#define IBMCD_NOT_CONNECTED     0x40

/* GPIO constants */
#define IBMCD_NPINS             3
#define PIN_OPEN                0
#define PIN_STATUS              1
#define PIN_CONNECTED           2

struct ibmcd_softc {
       bus_space_tag_t         sc_iot;
       bus_space_handle_t      sc_ioh;
       bus_size_t              sc_iosize;

       /* GPIO interface */
       struct gpio_chipset_tag sc_gpio_gc;
       gpio_pin_t              sc_gpio_pins[IBMCD_NPINS];
};

static int ibmcd_match(device_t, cfdata_t, void *);
static void ibmcd_attach(device_t, device_t, void *);
static int ibmcd_detach(device_t, int);
#if (__NetBSD_Version__ >= 600000000)
static bool ibmcd_suspend(device_t, const pmf_qual_t *);
static bool ibmcd_resume(device_t, const pmf_qual_t *);
#endif
int ibmcd_gpio_pin_read(void *, int);
void ibmcd_gpio_pin_write(void *, int, int);
void ibmcd_gpio_pin_ctl(void *, int, int);

CFATTACH_DECL2_NEW(ibmcd, sizeof(struct ibmcd_softc), ibmcd_match,
   ibmcd_attach, ibmcd_detach, NULL, NULL, NULL);

static int
ibmcd_match(device_t parent, cfdata_t match, void *aux)
{
       struct pci_attach_args *pa = (struct pci_attach_args *)aux;

       if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_IBM &&
           PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_IBM_4810_BSP)
               return 1;
       return 0;
}

void
ibmcd_attach(device_t parent, device_t self, void *aux)
{
       struct ibmcd_softc *sc = device_private(self);
       struct pci_attach_args *const pa = (struct pci_attach_args *)aux;
       struct gpiobus_attach_args gba;
       pcireg_t memtype;

       aprint_naive("\n");
       memtype = pci_mapreg_type(pa->pa_pc, pa->pa_tag, PCI_MAPREG_START);
       if (pci_mapreg_map(pa, PCI_MAPREG_START, memtype, 0, &sc->sc_iot,
           &sc->sc_ioh, NULL, &sc->sc_iosize)) {
               aprint_error("\n");
               aprint_error_dev(self, "PCI %s region not found\n",
                   memtype == PCI_MAPREG_TYPE_IO ? "I/O" : "memory");
               return;
       }
       aprint_normal(": IBM 4810 BSP cash drawer\n");

#if (__NetBSD_Version__ >= 600000000)
       if (!pmf_device_register(self, ibmcd_suspend, ibmcd_resume))
               aprint_error_dev(self, "couldn't establish power handler\n");
#endif
       /* Initialize pins array */
       sc->sc_gpio_pins[PIN_OPEN].pin_num = 0;
       sc->sc_gpio_pins[PIN_OPEN].pin_caps = GPIO_PIN_OUTPUT;
       sc->sc_gpio_pins[PIN_STATUS].pin_num = 1;
       sc->sc_gpio_pins[PIN_STATUS].pin_caps = GPIO_PIN_INPUT;
       sc->sc_gpio_pins[PIN_CONNECTED].pin_num = 2;
       sc->sc_gpio_pins[PIN_CONNECTED].pin_caps = GPIO_PIN_INPUT;

       /* Create controller tag */
       sc->sc_gpio_gc.gp_cookie = sc;
       sc->sc_gpio_gc.gp_pin_read = ibmcd_gpio_pin_read;
       sc->sc_gpio_gc.gp_pin_write = ibmcd_gpio_pin_write;
       sc->sc_gpio_gc.gp_pin_ctl = ibmcd_gpio_pin_ctl;

       gba.gba_gc = &sc->sc_gpio_gc;
       gba.gba_pins = sc->sc_gpio_pins;
       gba.gba_npins = IBMCD_NPINS;

       /* Attach GPIO framework */
       config_found(self, &gba, gpiobus_print, CFARGS_NONE);

}

static int
ibmcd_detach(device_t self, int flags)
{
       struct ibmcd_softc *sc = device_private(self);

#if (__NetBSD_Version__ >= 600000000)
       pmf_device_deregister(self);
#endif
       if (sc->sc_iosize)
               bus_space_unmap(sc->sc_iot, sc->sc_ioh, sc->sc_iosize);
       return 0;
}

#if (__NetBSD_Version__ >= 600000000)
static bool
ibmcd_resume(device_t self, const pmf_qual_t *qual)
{
       return true;
}

static bool
ibmcd_suspend(device_t self, const pmf_qual_t *qual)
{
       return true;
}
#endif

int
ibmcd_gpio_pin_read(void *arg, int pin)
{
       struct ibmcd_softc *sc = arg;
       uint8_t data;

       data = bus_space_read_1(sc->sc_iot, sc->sc_ioh, IBMCD_STATUS);

       switch (pin) {
       case PIN_STATUS:
               return data & IBMCD_CLOSED ? 0 : 1;
       case PIN_CONNECTED:
               return data & IBMCD_NOT_CONNECTED ? 0 : 1;
       default:
               return 0;
       }
}

void
ibmcd_gpio_pin_write(void *arg, int pin, int value)
{
       struct ibmcd_softc *sc = arg;

       if (pin != PIN_OPEN)
               return;

       bus_space_write_1(sc->sc_iot, sc->sc_ioh, IBMCD_STATUS,
           value ? IBMCD_DO_OPEN : 0);
       bus_space_write_1(sc->sc_iot, sc->sc_ioh, IBMCD_CONTROL,
           IBMCD_CMD_OPEN);
}

void
ibmcd_gpio_pin_ctl(void *arg, int pin, int flags)
{
       /* We ignore pin control requests since the pin functions are fixed. */
}

MODULE(MODULE_CLASS_DRIVER, ibmcd, "pci");

#ifdef _MODULE
#include "ioconf.c"
#endif

static int
ibmcd_modcmd(modcmd_t cmd, void *opaque)
{
       int error;

       error = 0;
       switch (cmd) {
       case MODULE_CMD_INIT:
#ifdef _MODULE
               error = config_init_component(cfdriver_ioconf_ibmcd,
                   cfattach_ioconf_ibmcd, cfdata_ioconf_ibmcd);
               if (error)
                       aprint_error("%s: unable to init component\n",
                           ibmcd_cd.cd_name);
#endif
               break;
       case MODULE_CMD_FINI:
#ifdef _MODULE
               config_fini_component(cfdriver_ioconf_ibmcd,
                   cfattach_ioconf_ibmcd, cfdata_ioconf_ibmcd);
#endif
               break;
       default:
               error = ENOTTY;
       }
       return error;
}

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