/* $NetBSD: macekbc.c,v 1.9 2019/10/01 18:00:07 chs Exp $ */

/*-
* Copyright (c) 2007 Jared D. McNeill <[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 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.
*/

/*
* SGI MACE PS2 keyboard/mouse controller driver
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: macekbc.c,v 1.9 2019/10/01 18:00:07 chs Exp $");

#include <sys/param.h>
#include <sys/device.h>
#include <sys/syslog.h>
#include <sys/kmem.h>

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

#include <sgimips/mace/macevar.h>

#include <dev/arcbios/arcbios.h>
#include <dev/arcbios/arcbiosvar.h>
#include <dev/pckbport/pckbportvar.h>

#define MACEKBC_TX      0x00
#define MACEKBC_RX      0x08
#define MACEKBC_CTRL    0x10
#define         MACEKBC_CTRL_TXCLKOFF   (1 << 0)
#define         MACEKBC_CTRL_TXON       (1 << 1)
#define         MACEKBC_CTRL_TXINTEN    (1 << 2)
#define         MACEKBC_CTRL_RXINTEN    (1 << 3)
#define         MACEKBC_CTRL_RXCLKON    (1 << 4)
#define         MACEKBC_CTRL_RESET      (1 << 5)
#define MACEKBC_STAT    0x18
#define         MACEKBC_STAT_TXEMPTY    (1 << 3)
#define         MACEKBC_STAT_RXFULL     (1 << 4)

struct macekbc_softc {
       struct macekbc_internal *sc_id;

       bus_space_tag_t         sc_iot;
       bus_space_handle_t      sc_ioh;
};

struct macekbc_internal {
       struct macekbc_softc    *t_sc;
       pckbport_tag_t          t_pt;

       bus_space_tag_t         t_iot;
       bus_space_handle_t      t_ioh[PCKBPORT_NSLOTS];
       int                     t_present[PCKBPORT_NSLOTS];

       void                    *t_rxih;
};

static int      macekbc_intr(void *);
static void     macekbc_reset(struct macekbc_internal *, pckbport_slot_t);

static int      macekbc_xt_translation(void *, pckbport_slot_t, int);
static int      macekbc_send_devcmd(void *, pckbport_slot_t, u_char);
static int      macekbc_poll_data1(void *, pckbport_slot_t);
static void     macekbc_slot_enable(void *, pckbport_slot_t, int);
static void     macekbc_intr_establish(void *, pckbport_slot_t);
static void     macekbc_set_poll(void *, pckbport_slot_t, int);

static int      macekbc_match(device_t, cfdata_t, void *);
static void     macekbc_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(macekbc, sizeof(struct macekbc_softc),
   macekbc_match, macekbc_attach, NULL, NULL);

static struct pckbport_accessops macekbc_ops = {
       .t_xt_translation       = macekbc_xt_translation,
       .t_send_devcmd          = macekbc_send_devcmd,
       .t_poll_data1           = macekbc_poll_data1,
       .t_slot_enable          = macekbc_slot_enable,
       .t_intr_establish       = macekbc_intr_establish,
       .t_set_poll             = macekbc_set_poll,
};

static int
macekbc_match(device_t parent, cfdata_t match, void *aux)
{

       return 1;
}

static void
macekbc_attach(device_t parent, device_t self, void *aux)
{
       struct mace_attach_args *maa;
       struct macekbc_softc *sc;
       struct macekbc_internal *t;
       int slot;
       const char *consdev;

       maa = aux;
       sc = device_private(self);

       aprint_normal(": PS2 controller\n");
       aprint_naive("\n");

       t = kmem_alloc(sizeof(struct macekbc_internal), KM_SLEEP);
       t->t_iot = maa->maa_st;
       for (slot = 0; slot < PCKBPORT_NSLOTS; slot++)
               t->t_present[slot] = 0;
       if (bus_space_subregion(t->t_iot, maa->maa_sh, maa->maa_offset,
           0, &t->t_ioh[PCKBPORT_KBD_SLOT]) != 0) {
               aprint_error("%s: couldn't map kbd registers\n",
                   device_xname(self));
               goto bork;
       }
       if (bus_space_subregion(t->t_iot, maa->maa_sh, maa->maa_offset + 32,
           0, &t->t_ioh[PCKBPORT_AUX_SLOT]) != 0) {
               aprint_error("%s: couldn't map aux registers\n",
                   device_xname(self));
               goto bork;
       }

       if ((t->t_rxih = cpu_intr_establish(maa->maa_intr, maa->maa_intrmask,
           macekbc_intr, t)) == NULL) {
               printf("%s: couldn't establish interrupt\n",
                   device_xname(self));
               goto bork;
       }
       sc->sc_id = t;
       t->t_sc = sc;

       macekbc_reset(t, PCKBPORT_KBD_SLOT);
       macekbc_reset(t, PCKBPORT_AUX_SLOT);

       consdev = arcbios_GetEnvironmentVariable("ConsoleIn");
       if (consdev != NULL && strcmp(consdev, "keyboard()") == 0)
               pckbport_cnattach(t, &macekbc_ops, PCKBPORT_KBD_SLOT);

       t->t_pt = pckbport_attach(t, &macekbc_ops);
       if (pckbport_attach_slot(self, t->t_pt, PCKBPORT_KBD_SLOT))
               t->t_present[PCKBPORT_KBD_SLOT] = 1;
       if (pckbport_attach_slot(self, t->t_pt, PCKBPORT_AUX_SLOT))
               t->t_present[PCKBPORT_AUX_SLOT] = 1;

       return;
bork:
       kmem_free(t, sizeof(struct macekbc_internal));
       return;
}

static int
macekbc_intr(void *opaque)
{
       struct macekbc_internal *t;
       bus_space_tag_t iot;
       bus_space_handle_t ioh;
       uint64_t stat, val;
       pckbport_slot_t slot;
       int rv;

       t = opaque;
       iot = t->t_iot;
       rv = 0;

       for (slot = 0; slot < PCKBPORT_NSLOTS; slot++) {
               if (t->t_present[slot] == 0)
                       continue;

               ioh = t->t_ioh[slot];
               stat = bus_space_read_8(iot, ioh, MACEKBC_STAT);
               if (stat & MACEKBC_STAT_RXFULL) {
                       val = bus_space_read_8(iot, ioh, MACEKBC_RX);
                       pckbportintr(t->t_pt, slot, val & 0xff);
                       rv = 1;
               }
       }

       return rv;
}

static void
macekbc_reset(struct macekbc_internal *t, pckbport_slot_t slot)
{
       bus_space_tag_t iot;
       bus_space_handle_t ioh;
       uint64_t val;

       iot = t->t_iot;
       ioh = t->t_ioh[slot];

       val = bus_space_read_8(iot, ioh, MACEKBC_CTRL);
       val |= MACEKBC_CTRL_TXCLKOFF | MACEKBC_CTRL_RESET;
       bus_space_write_8(iot, ioh, MACEKBC_CTRL, val);

       delay(10000);

       val &= ~(MACEKBC_CTRL_TXCLKOFF | MACEKBC_CTRL_RESET);
       val |= MACEKBC_CTRL_TXON | MACEKBC_CTRL_RXCLKON | MACEKBC_CTRL_RXINTEN;
       bus_space_write_8(iot, ioh, MACEKBC_CTRL, val);

       return;
}

static int
macekbc_wait(struct macekbc_internal *t, pckbport_slot_t slot,
   uint64_t mask, bool set)
{
       bus_space_tag_t iot;
       bus_space_handle_t ioh;
       uint64_t val, tmp;
       int timeout;

       iot = t->t_iot;
       ioh = t->t_ioh[slot];
       val = (set ? mask : 0);
       timeout = 1000;

       while (timeout-- > 0) {
               tmp = bus_space_read_8(iot, ioh, MACEKBC_STAT);
               if ((tmp & mask) == val)
                       return 0;
               delay(10);
       }

       return 1;
}

static int
macekbc_xt_translation(void *opaque, pckbport_slot_t port, int on)
{

       if (on)
               return 0;

       return 1;
}

static int
macekbc_send_devcmd(void *opaque, pckbport_slot_t slot, u_char byte)
{
       struct macekbc_internal *t;
       bus_space_tag_t iot;
       bus_space_handle_t ioh;

       t = opaque;
       iot = t->t_iot;
       ioh = t->t_ioh[slot];

       if (macekbc_wait(t, slot, MACEKBC_STAT_TXEMPTY, 1))
               return 0;

       bus_space_write_8(iot, ioh, MACEKBC_TX, byte & 0xff);

       return 1;
}

static int
macekbc_poll_data1(void *opaque, pckbport_slot_t slot)
{
       struct macekbc_internal *t;
       bus_space_tag_t iot;
       bus_space_handle_t ioh;

       t = opaque;
       iot = t->t_iot;
       ioh = t->t_ioh[slot];

       if (macekbc_wait(t, slot, MACEKBC_STAT_RXFULL, 1)) /* rx full */
               return -1;

       return bus_space_read_8(iot, ioh, MACEKBC_RX) & 0xff;
}

static void
macekbc_slot_enable(void *opaque, pckbport_slot_t slot, int on)
{
       struct macekbc_internal *t;
       bus_space_tag_t iot;
       bus_space_handle_t ioh;
       uint64_t val;

       t = opaque;
       iot = t->t_iot;
       ioh = t->t_ioh[slot];

       val = bus_space_read_8(iot, ioh, MACEKBC_CTRL);
       if (on)
               val |= MACEKBC_CTRL_TXON | MACEKBC_CTRL_RXCLKON;
       else
               val &= ~(MACEKBC_CTRL_TXON | MACEKBC_CTRL_RXCLKON);
       bus_space_write_8(iot, ioh, MACEKBC_CTRL, val);

       return;
}

static void
macekbc_intr_establish(void *opaque, pckbport_slot_t slot)
{

       /* XXX */
       macekbc_set_poll(opaque, slot, 0);

       return;
}

static void
macekbc_set_poll(void *opaque, pckbport_slot_t slot, int on)
{
       struct macekbc_internal *t;
       bus_space_tag_t iot;
       bus_space_handle_t ioh;
       uint64_t val;

       t = opaque;
       iot = t->t_iot;
       ioh = t->t_ioh[slot];

       val = bus_space_read_8(iot, ioh, MACEKBC_CTRL);
       if (on)
               val &= ~MACEKBC_CTRL_RXINTEN;
       else
               val |= MACEKBC_CTRL_RXINTEN;
       bus_space_write_8(iot, ioh, MACEKBC_CTRL, val);

       return;
}

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