/* $NetBSD: aupsc.c,v 1.9 2021/08/07 16:18:58 thorpej Exp $ */

/*-
* Copyright (c) 2006 Shigeyuki Fukushima.
* All rights reserved.
*
* Written by Shigeyuki Fukushima.
*
* 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: aupsc.c,v 1.9 2021/08/07 16:18:58 thorpej Exp $");

#include "locators.h"

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

#include <sys/bus.h>
#include <machine/cpu.h>

#include <mips/alchemy/include/aubusvar.h>
#include <mips/alchemy/include/aureg.h>
#include <mips/alchemy/dev/aupscreg.h>
#include <mips/alchemy/dev/aupscvar.h>
#include <mips/alchemy/dev/ausmbus_pscreg.h>

struct aupsc_softc {
       device_t                sc_dev;
       bus_space_tag_t         sc_bust;
       bus_space_handle_t      sc_bush;
       int                     sc_pscsel;
};

const struct aupsc_proto {
       const char *name;
       int protocol;
} aupsc_protos [] = {
       { "ausmbus", AUPSC_SEL_SMBUS },
       { "auspi", AUPSC_SEL_SPI },
#if 0
       { "auaudio" },
       { "aui2s" },
#endif
       { NULL, AUPSC_SEL_DISABLE }
};

static int      aupsc_match(device_t, struct cfdata *, void *);
static void     aupsc_attach(device_t, device_t, void *);
static int      aupsc_submatch(device_t, struct cfdata *, const int *, void *);
static int      aupsc_print(void *, const char *);

static void     aupsc_enable(void *, int);
static void     aupsc_disable(void *);
static void     aupsc_suspend(void *);


CFATTACH_DECL_NEW(aupsc, sizeof(struct aupsc_softc),
       aupsc_match, aupsc_attach, NULL, NULL);

static int
aupsc_match(device_t parent, struct cfdata *cf, void *aux)
{
       struct aubus_attach_args *aa = (struct aubus_attach_args *)aux;

       if (strcmp(aa->aa_name, cf->cf_name) != 0)
               return 0;

       return 1;
}

static void
aupsc_attach(device_t parent, device_t self, void *aux)
{
       int i;
       uint32_t rv;
       struct aupsc_softc *sc = device_private(self);
       struct aubus_attach_args *aa = (struct aubus_attach_args *)aux;
       struct aupsc_attach_args pa;
       struct aupsc_controller ctrl;

       sc->sc_dev = self;
       sc->sc_bust = aa->aa_st;
       if (bus_space_map(sc->sc_bust, aa->aa_addr,
                       AUPSC_SIZE, 0, &sc->sc_bush) != 0) {
               aprint_error(": unable to map device registers\n");
               return;
       }

       /* Initialize PSC_SEL register */
       sc->sc_pscsel = AUPSC_SEL_DISABLE;
       rv = bus_space_read_4(sc->sc_bust, sc->sc_bush, AUPSC_SEL);
       bus_space_write_4(sc->sc_bust, sc->sc_bush,
               AUPSC_SEL, (rv & AUPSC_SEL_PS(AUPSC_SEL_DISABLE)));
       bus_space_write_4(sc->sc_bust, sc->sc_bush,
               AUPSC_CTRL, AUPSC_CTRL_ENA(AUPSC_CTRL_DISABLE));

       aprint_normal(": Alchemy PSC\n");
       aprint_naive("\n");

       ctrl.psc_bust = sc->sc_bust;
       ctrl.psc_bush = sc->sc_bush;
       ctrl.psc_sel = &(sc->sc_pscsel);
       ctrl.psc_enable = aupsc_enable;
       ctrl.psc_disable = aupsc_disable;
       ctrl.psc_suspend = aupsc_suspend;
       pa.aupsc_ctrl = ctrl;
       pa.aupsc_addr = aa->aa_addr;
       pa.aupsc_irq = aa->aa_irq[0];

       for (i = 0 ; aupsc_protos[i].name != NULL ; i++) {
               struct aupsc_protocol_device p;
               uint32_t s;

               pa.aupsc_name = aupsc_protos[i].name;

               p.sc_dev = sc->sc_dev;
               p.sc_ctrl = ctrl;

               aupsc_enable(&p, aupsc_protos[i].protocol);
               s = bus_space_read_4(sc->sc_bust, sc->sc_bush, AUPSC_STAT);
               aupsc_disable(&p);

               if (s & AUPSC_STAT_SR) {
                       config_found(self, &pa, aupsc_print,
                           CFARGS(.submatch = aupsc_submatch));
               }
       }
}

static int
aupsc_submatch(device_t parent, struct cfdata *cf, const int *ldesc, void *aux)
{

       return config_match(parent, cf, aux);
}

static int
aupsc_print(void *aux, const char *pnp)
{
       /*
        * By default we don't want to print anything, because
        * otherwise we see complaints about protocols that aren't
        * configured on every port.  (E.g. each PSC can support 4
        * protocols, but on a typical design, only one protocol can
        * be configured per board.)
        *
        * Basically, this whole thing should be replaced with an
        * indirect configuration mechanism.  Direct configuration
        * doesn't make sense when we absolutely require kernel
        * configuration to operate.
        *
        * Alternatively, a board-specific configuration mechanism
        * could determine this, and provide direct configuration as
        * we do for PCMCIA.
        */

       return QUIET;
}

static void
aupsc_enable(void *arg, int proto)
{
       struct aupsc_protocol_device *sc = arg;
       int i;

       /* XXX: (TODO) setting clock AUPSC_SEL_CLK */
       switch (proto) {
       case AUPSC_SEL_SPI:
       case AUPSC_SEL_I2S:
       case AUPSC_SEL_AC97:
       case AUPSC_SEL_SMBUS:
               break;
       case AUPSC_SEL_DISABLE:
               aupsc_disable(arg);
               break;
       default:
               printf("%s: aupsc_enable: unsupported protocol.\n",
                       device_xname(sc->sc_dev));
               return;
       }

       if (*(sc->sc_ctrl.psc_sel) != AUPSC_SEL_DISABLE) {
               printf("%s: aupsc_enable: please disable first.\n",
                       device_xname(sc->sc_dev));
               return;
       }

       bus_space_write_4(sc->sc_ctrl.psc_bust, sc->sc_ctrl.psc_bush,
                       AUPSC_SEL, AUPSC_SEL_PS(proto));
       bus_space_write_4(sc->sc_ctrl.psc_bust, sc->sc_ctrl.psc_bush,
                       AUPSC_CTRL, AUPSC_CTRL_ENA(AUPSC_CTRL_ENABLE));

       /* wait up to a whole second, but test every 10us */
       for (i = 1000000; i; i -= 10) {
               if (bus_space_read_4(sc->sc_ctrl.psc_bust,
                       sc->sc_ctrl.psc_bush, AUPSC_STAT) & AUPSC_STAT_SR)
                       return;
               delay(10);
       }
}

static void
aupsc_disable(void *arg)
{
       struct aupsc_protocol_device *sc = arg;

       bus_space_write_4(sc->sc_ctrl.psc_bust, sc->sc_ctrl.psc_bush,
                       AUPSC_SEL, AUPSC_SEL_PS(AUPSC_SEL_DISABLE));
       bus_space_write_4(sc->sc_ctrl.psc_bust, sc->sc_ctrl.psc_bush,
                       AUPSC_CTRL, AUPSC_CTRL_ENA(AUPSC_CTRL_DISABLE));
       delay(1);
}

static void
aupsc_suspend(void *arg)
{
       struct aupsc_protocol_device *sc = arg;

       bus_space_write_4(sc->sc_ctrl.psc_bust, sc->sc_ctrl.psc_bush,
                       AUPSC_CTRL, AUPSC_CTRL_ENA(AUPSC_CTRL_SUSPEND));
       delay(1);
}

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