/* $NetBSD: tcu.c,v 1.6 2021/08/07 16:19:16 thorpej Exp $ */

/*-
* Copyright (c) 2016, Felix Deichmann
* 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 COPYRIGHT HOLDERS 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.
*/

/*
* flxd TC-USB - TURBOchannel USB host option
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: tcu.c,v 1.6 2021/08/07 16:19:16 thorpej Exp $");

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

#include <sys/bus.h>

#include <dev/tc/tcvar.h>

#include <dev/gpio/gpiovar.h>

#include "gpio.h"
#include "slhci_tcu.h"

#define TCU_GPIO_NPINS  8

#define TCU_CPLD_OFFS   0x80
#define TCU_CPLD_SIZE   (4 * 4)

#define TCU_CFG         0x0
#define   TCU_CFG_RUN   __BIT(7)        /* write-only */
#define   TCU_CFG_S1_1  __BIT(3)        /* read-only */
#define   TCU_CFG_S1_2  __BIT(2)        /* read-only */
#define   TCU_CFG_S1_3  __BIT(1)        /* read-only */
#define   TCU_CFG_S1_4  __BIT(0)        /* read-only */
#define TCU_GPIO_DIR    0x4
#define TCU_GPIO_IN     0x8
#define TCU_GPIO_OUT    0xc

struct tcu_softc {
#if NGPIO > 0
       kmutex_t                sc_gpio_mtx;
       struct gpio_chipset_tag sc_gpio_gc;
       gpio_pin_t              sc_gpio_pins[TCU_GPIO_NPINS];
       bus_space_tag_t         sc_gpio_iot;
       bus_space_handle_t      sc_gpio_ioh;
#endif /* NGPIO > 0 */
};

static int  tcu_match(device_t, cfdata_t, void *);
static void tcu_attach(device_t, device_t, void *);

#if NSLHCI_TCU > 0
static int  tcu_print(void *, const char *);
#endif /* NSLHCI_TCU > 0 */
#if NGPIO > 0
static void tcu_gpio_attach(device_t, device_t, void *);
static int  tcu_gpio_read(void *, int);
static void tcu_gpio_write(void *, int, int);
static void tcu_gpio_ctl(void *, int, int);
#endif /* NGPIO > 0 */

CFATTACH_DECL_NEW(tcu, sizeof(struct tcu_softc),
   tcu_match, tcu_attach, NULL, NULL);

static int
tcu_match(device_t parent, cfdata_t cf, void *aux)
{
       struct tc_attach_args *ta = aux;

       if (strncmp("TC-USB  ", ta->ta_modname, TC_ROM_LLEN))
               return 0;

       return 1;
}

static void
tcu_attach(device_t parent, device_t self, void *aux)
{
       struct tc_attach_args *ta = aux;
       bus_space_tag_t iot = ta->ta_memt;
       bus_space_handle_t ioh;
       int error;
       uint8_t cfg;
       char buf[30];

       printf(": TC-USB\n");

       error = bus_space_map(iot, ta->ta_addr + TCU_CPLD_OFFS, TCU_CPLD_SIZE,
           0, &ioh);
       if (error) {
               aprint_error_dev(self, "bus_space_map() failed (%d)\n", error);
               return;
       }

       /*
        * Force reset in case system didn't. SL811 reset pulse and hold time
        * must be min. 16 clocks long (at 48 MHz clock) each.
        */
       bus_space_write_1(iot, ioh, TCU_CFG, 0);
       DELAY(1000);
       bus_space_write_1(iot, ioh, TCU_CFG, TCU_CFG_RUN);
       DELAY(1000);

       cfg = bus_space_read_1(iot, ioh, TCU_CFG);

       bus_space_unmap(iot, ioh, TCU_CPLD_SIZE);

       /* Display DIP switch configuration. */
       (void)snprintb(buf, sizeof(buf),
           "\177\020"
           "b\3S1-1\0"
           "b\2S1-2\0"
           "b\1S1-3\0"
           "b\0S1-4\0"
           "\0", cfg);
       aprint_normal_dev(self, "config %s\n", buf);

       if ((cfg & TCU_CFG_S1_1) != 0 && ta->ta_busspeed != TC_SPEED_12_5_MHZ)
               aprint_error_dev(self, "warning: switch S1-1 asserted with "
                   "clock != 12.5 MHz\n");

#if NSLHCI_TCU > 0
       /* Attach slhci. */
       (void)config_found(self, aux, tcu_print,
           CFARGS(.iattr = "tcu"));
#endif /* NSLHCI_TCU > 0 */
#if NGPIO > 0
       /* Attach gpio(bus). */
       tcu_gpio_attach(parent, self, aux);
#endif /* NGPIO > 0 */
}

#if NSLHCI_TCU > 0
static int
tcu_print(void *aux, const char *pnp)
{

       /* This function is only used for "slhci at tcu". */
       if (pnp)
               aprint_normal("slhci at %s", pnp);

       return UNCONF;
}
#endif /* NSLHCI_TCU > 0 */

#if NGPIO > 0
static void
tcu_gpio_attach(device_t parent, device_t self, void *aux)
{
       struct tcu_softc *sc = device_private(self);
       struct tc_attach_args *ta = aux;
       struct gpiobus_attach_args gba;
       bus_space_tag_t iot = ta->ta_memt;
       uint32_t v;
       int error;

       sc->sc_gpio_iot = iot;

       error = bus_space_map(iot, ta->ta_addr + TCU_CPLD_OFFS, TCU_CPLD_SIZE,
           0, &sc->sc_gpio_ioh);
       if (error) {
               aprint_error_dev(self, "bus_space_map() failed (%d)\n", error);
               return;
       }

       mutex_init(&sc->sc_gpio_mtx, MUTEX_DEFAULT, IPL_NONE);

       v = bus_space_read_4(sc->sc_gpio_iot, sc->sc_gpio_ioh, TCU_GPIO_DIR);

       for (int pin = 0; pin < TCU_GPIO_NPINS; pin++) {
               sc->sc_gpio_pins[pin].pin_num = pin;
               sc->sc_gpio_pins[pin].pin_caps = GPIO_PIN_INPUT |
                   GPIO_PIN_OUTPUT;
               sc->sc_gpio_pins[pin].pin_flags = (v & (UINT32_C(1) << pin)) ?
                   GPIO_PIN_OUTPUT : GPIO_PIN_INPUT;
               sc->sc_gpio_pins[pin].pin_state = tcu_gpio_read(sc, pin);
       }

       sc->sc_gpio_gc.gp_cookie = sc;
       sc->sc_gpio_gc.gp_pin_read = tcu_gpio_read;
       sc->sc_gpio_gc.gp_pin_write = tcu_gpio_write;
       sc->sc_gpio_gc.gp_pin_ctl = tcu_gpio_ctl;

       memset(&gba, 0, sizeof(gba));

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

       config_found(self, &gba, gpiobus_print,
           CFARGS(.iattr = "gpiobus"));
}

static int
tcu_gpio_read(void *arg, int pin)
{
       struct tcu_softc *sc = arg;
       uint32_t v;

       mutex_enter(&sc->sc_gpio_mtx);
       v = bus_space_read_4(sc->sc_gpio_iot, sc->sc_gpio_ioh, TCU_GPIO_IN);
       mutex_exit(&sc->sc_gpio_mtx);

       return (v & (UINT32_C(1) << pin)) ? GPIO_PIN_HIGH : GPIO_PIN_LOW;
}

static void
tcu_gpio_write(void *arg, int pin, int val)
{
       struct tcu_softc *sc = arg;
       uint32_t v;

       mutex_enter(&sc->sc_gpio_mtx);

       v = bus_space_read_4(sc->sc_gpio_iot, sc->sc_gpio_ioh, TCU_GPIO_OUT);

       if (val == GPIO_PIN_LOW)
               v &= ~(UINT32_C(1) << pin);
       else if (val == GPIO_PIN_HIGH)
               v |= (UINT32_C(1) << pin);

       bus_space_write_4(sc->sc_gpio_iot, sc->sc_gpio_ioh, TCU_GPIO_OUT, v);

       mutex_exit(&sc->sc_gpio_mtx);
}

static void
tcu_gpio_ctl(void *arg, int pin, int flags)
{
       struct tcu_softc *sc = arg;
       uint32_t v;

       mutex_enter(&sc->sc_gpio_mtx);

       v = bus_space_read_4(sc->sc_gpio_iot, sc->sc_gpio_ioh, TCU_GPIO_DIR);

       if (flags & GPIO_PIN_INPUT)
               v &= ~(UINT32_C(1) << pin);
       if (flags & GPIO_PIN_OUTPUT)
               v |= (UINT32_C(1) << pin);

       bus_space_write_4(sc->sc_gpio_iot, sc->sc_gpio_ioh, TCU_GPIO_DIR, v);

       mutex_exit(&sc->sc_gpio_mtx);
}
#endif /* NGPIO > 0 */

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