/*      $NetBSD: j720kbd.c,v 1.8 2021/08/07 16:18:53 thorpej Exp $      */

/*-
* Copyright (c) 2006 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by IWAMOTO Toshihiro and Peter Postma.
*
* 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.
*/

/* Jornada 720 keyboard driver. */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: j720kbd.c,v 1.8 2021/08/07 16:18:53 thorpej Exp $");

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

#include <machine/bootinfo.h>
#include <machine/config_hook.h>
#include <machine/platid.h>
#include <machine/platid_mask.h>

#include <arm/sa11x0/sa11x0_var.h>
#include <arm/sa11x0/sa11x0_gpioreg.h>
#include <arm/sa11x0/sa11x0_ppcreg.h>
#include <arm/sa11x0/sa11x0_sspreg.h>

#include <dev/hpc/hpckbdvar.h>

#include <hpcarm/dev/j720sspvar.h>

#ifdef DEBUG
#define DPRINTF(arg)    aprint_normal arg
#else
#define DPRINTF(arg)    /* nothing */
#endif

struct j720kbd_chip {
       int                     scc_enabled;

       struct j720ssp_softc    *scc_ssp;

       struct hpckbd_ic_if     scc_if;
       struct hpckbd_if        *scc_hpckbd;
};

struct j720kbd_softc {
       device_t                sc_dev;

       struct j720kbd_chip     *sc_chip;
};

static struct j720kbd_chip j720kbd_chip;

static int      j720kbd_match(device_t, cfdata_t, void *);
static void     j720kbd_attach(device_t, device_t, void *);

static void     j720kbd_cnattach(void);
static void     j720kbd_ifsetup(struct j720kbd_chip *);
static int      j720kbd_input_establish(void *, struct hpckbd_if *);
static int      j720kbd_intr(void *);
static int      j720kbd_poll(void *);
static void     j720kbd_read(struct j720kbd_chip *, char *);

CFATTACH_DECL_NEW(j720kbd, sizeof(struct j720kbd_softc),
   j720kbd_match, j720kbd_attach, NULL, NULL);


static int
j720kbd_match(device_t parent, cfdata_t cf, void *aux)
{

       if (!platid_match(&platid, &platid_mask_MACH_HP_JORNADA_7XX))
               return 0;
       if (strcmp(cf->cf_name, "j720kbd") != 0)
               return 0;

       return 1;
}

static void
j720kbd_attach(device_t parent, device_t self, void *aux)
{
       struct j720kbd_softc *sc = device_private(self);
       struct hpckbd_attach_args haa;

       aprint_normal("\n");

       sc->sc_dev = self;
       sc->sc_chip = &j720kbd_chip;
       sc->sc_chip->scc_ssp = device_private(parent);
       sc->sc_chip->scc_enabled = 0;

       /* Attach console if not using serial. */
       if (!(bootinfo->bi_cnuse & BI_CNUSE_SERIAL))
               j720kbd_cnattach();

       j720kbd_ifsetup(sc->sc_chip);

       /* Install interrupt handler. */
       sa11x0_intr_establish(0, 0, 1, IPL_TTY, j720kbd_intr, sc);

       /* Attach hpckbd. */
       haa.haa_ic = &sc->sc_chip->scc_if;
       config_found(self, &haa, hpckbd_print, CFARGS_NONE);
}

static void
j720kbd_cnattach(void)
{
       struct j720kbd_chip *scc = &j720kbd_chip;

       /* Initialize interface. */
       j720kbd_ifsetup(scc);

       /* Attach console. */
       hpckbd_cnattach(&scc->scc_if);
}

static void
j720kbd_ifsetup(struct j720kbd_chip *scc)
{

       scc->scc_if.hii_ctx = scc;
       scc->scc_if.hii_establish = j720kbd_input_establish;
       scc->scc_if.hii_poll = j720kbd_poll;
}

static int
j720kbd_input_establish(void *ic, struct hpckbd_if *kbdif)
{
       struct j720kbd_chip *scc = ic;

       /* Save hpckbd interface. */
       scc->scc_hpckbd = kbdif;

       scc->scc_enabled = 1;

       return 0;
}

static int
j720kbd_intr(void *arg)
{
       struct j720kbd_softc *sc = arg;
       struct j720ssp_softc *ssp = sc->sc_chip->scc_ssp;

       bus_space_write_4(ssp->sc_iot, ssp->sc_gpioh, SAGPIO_EDR, 1);

       return j720kbd_poll(sc->sc_chip);
}

static int
j720kbd_poll(void *arg)
{
       struct j720kbd_chip *scc = arg;
       int type, key;
       char buf[9], *p;

       if (!scc->scc_enabled) {
               DPRINTF(("j720kbd_poll: !scc_enabled\n"));
               return 0;
       }

       j720kbd_read(scc, buf);

       for (p = buf; *p; p++) {
               type = *p & 0x80 ? 0 : 1;
               key = *p & 0x7f;

               hpckbd_input(scc->scc_hpckbd, type, key);
       }

       return 1;
}

static void
j720kbd_read(struct j720kbd_chip *scc, char *buf)
{
       struct j720ssp_softc *ssp = scc->scc_ssp;
       int data, count;

       bus_space_write_4(ssp->sc_iot, ssp->sc_gpioh, SAGPIO_PCR, 0x2000000);

       /* Send scan keycode command. */
       if (j720ssp_readwrite(ssp, 1, 0x90, &data, 500) < 0 || data != 0x11) {
               DPRINTF(("j720kbd_read: no dummy received\n"));
               goto out;
       }

       /* Read number of scancodes available. */
       if (j720ssp_readwrite(ssp, 0, 0x11, &data, 500) < 0) {
               DPRINTF(("j720kbd_read: unable to read number of scancodes\n"));
               goto out;
       }
       count = data;

       for (; count; count--) {
               if (j720ssp_readwrite(ssp, 0, 0x11, &data, 100) < 0)
                       goto out;
               *buf++ = data;
       }
       *buf = 0;
       bus_space_write_4(ssp->sc_iot, ssp->sc_gpioh, SAGPIO_PSR, 0x2000000);

       return;

out:
       *buf = 0;
       bus_space_write_4(ssp->sc_iot, ssp->sc_gpioh, SAGPIO_PSR, 0x2000000);

       /* reset SSP */
       bus_space_write_4(ssp->sc_iot, ssp->sc_ssph, SASSP_CR0, 0x307);
       delay(100);
       bus_space_write_4(ssp->sc_iot, ssp->sc_ssph, SASSP_CR0, 0x387);

       DPRINTF(("j720kbd_read: error %x\n", data));
}

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