/*      $NetBSD: jazzio.c,v 1.24 2021/08/07 16:18:42 thorpej Exp $      */
/*      $OpenBSD: picabus.c,v 1.11 1999/01/11 05:11:10 millert Exp $    */
/*      NetBSD: tc.c,v 1.2 1995/03/08 00:39:05 cgd Exp  */

/*
* Copyright (c) 1994, 1995 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chris G. Demetriou
* Author: Per Fogelstrom. (Mips R4x00)
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
*  Software Distribution Coordinator  or  [email protected]
*  School of Computer Science
*  Carnegie Mellon University
*  Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: jazzio.c,v 1.24 2021/08/07 16:18:42 thorpej Exp $");

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

#include <sys/bus.h>
#include <machine/pio.h>
#include <machine/autoconf.h>
#include <machine/platform.h>

#include <arc/jazz/jazziovar.h>
#include <arc/jazz/pica.h>
#include <arc/jazz/jazzdmatlbreg.h>
#include <arc/jazz/jazzdmatlbvar.h>
#include <arc/jazz/dma.h>
#include <arc/jazz/pckbc_jazzioreg.h>

#include "ioconf.h"

void arc_sysreset(bus_addr_t, bus_size_t);

struct jazzio_softc {
       device_t sc_dev;
       struct  arc_bus_dma_tag sc_dmat;
       struct  pica_dev *sc_devs;
};

/* Definition of the driver for autoconfig. */
static int      jazziomatch(device_t, cfdata_t, void *);
static void     jazzioattach(device_t, device_t, void *);
static int      jazzioprint(void *, const char *);

CFATTACH_DECL_NEW(jazzio, sizeof(struct jazzio_softc),
   jazziomatch, jazzioattach, NULL, NULL);

static uint32_t jazzio_intr(uint32_t, struct clockframe *);
static int      jazzio_no_handler(void *);

/*
*  Interrupt dispatch table for jazz i/o bus.
*/
struct jazzio_intrhand {
       intr_handler_t  ih_func;        /* Interrupt handler */
       void            *ih_arg;        /* Parameter to send to handler */
       struct evcnt    ih_evcnt;       /* interrupt counter */
       char            ih_evname[32];  /* event counter name */
};

static struct jazzio_intrhand jazzio_intrtab[16];


struct jazzio_config *jazzio_conf = NULL;
struct pica_dev *jazzio_devconfig = NULL;
int jazzio_int_mask = 0;        /* jazz i/o interrupt enable mask */
struct arc_bus_space jazzio_bus;

static int jazzio_found = 0;

static int
jazziomatch(device_t parent, cfdata_t cf, void *aux)
{
       struct confargs *ca = aux;

       /* Make sure that we're looking for a jazzio bus. */
       if (strcmp(ca->ca_name, jazzio_cd.cd_name) != 0)
               return 0;

       return 1;
}

static void
jazzioattach(device_t parent, device_t self, void *aux)
{
       struct jazzio_softc *sc = device_private(self);
       struct jazzio_attach_args ja;
       int i;

       sc->sc_dev = self;

       if (jazzio_conf == NULL)
               panic("jazzio_conf isn't initialized");
       if (jazzio_devconfig == NULL)
               panic("jazzio_devconfig isn't initialized");

       jazzio_found = 1;

       aprint_normal("\n");

       /* keep our CPU device description handy */
       sc->sc_devs = jazzio_devconfig;

       /* initialize interrupt handler table */
       for (i = 0; i < __arraycount(jazzio_intrtab); i++) {
               jazzio_intrtab[i].ih_func = jazzio_no_handler;
               jazzio_intrtab[i].ih_arg = NULL;
       }

       /* set up interrupt handlers */
       (*platform->set_intr)(MIPS_INT_MASK_1, jazzio_intr, ARC_INTPRI_JAZZ);

       /* Initialize jazzio DMA mapping register area and pool */
       jazz_dmatlb_init(&jazzio_bus, jazzio_conf->jc_dmatlbreg);

       /* Create bus_dma_tag */
       jazz_bus_dma_tag_init(&sc->sc_dmat);

       /* Try to configure each jazzio attached device */
       for (i = 0; sc->sc_devs[i].ps_ca.ca_name != NULL; i++) {

               ja.ja_name = sc->sc_devs[i].ps_ca.ca_name;
               ja.ja_bust = &jazzio_bus;
               ja.ja_dmat = &sc->sc_dmat;
               ja.ja_addr = (bus_addr_t)sc->sc_devs[i].ps_base;
               ja.ja_intr = sc->sc_devs[i].ps_ca.ca_slot;
               ja.ja_dma = 0;

               /* Tell the autoconfig machinery we've found the hardware. */
               config_found(self, &ja, jazzioprint, CFARGS_NONE);
       }
}

static int
jazzioprint(void *aux, const char *pnp)
{
       struct jazzio_attach_args *ja = aux;

       if (pnp)
               aprint_normal("%s at %s", ja->ja_name, pnp);
       aprint_normal(" addr 0x%lx", ja->ja_addr);
       if (ja->ja_intr != -1)
               aprint_normal(" intr %d", ja->ja_intr);
       return UNCONF;
}

void
jazzio_intr_establish(int intr, intr_handler_t handler, void *val)
{
       struct jazzio_intrhand *jirp;

       if (intr < 0 || intr >= __arraycount(jazzio_intrtab))
               panic("jazzio intr %d out of range", intr);
       jirp = &jazzio_intrtab[intr];
       if (jirp->ih_func != jazzio_no_handler)
               panic("jazzio intr %d already set to %p", intr, jirp->ih_func);

       jazzio_int_mask |= 1 << intr;
       jirp->ih_func = handler;
       jirp->ih_arg = val;
       snprintf(jirp->ih_evname, sizeof(jirp->ih_evname), "intr %d", intr);
       evcnt_attach_dynamic(&jirp->ih_evcnt, EVCNT_TYPE_INTR,
           NULL, "jazzio", jirp->ih_evname);

       (*jazzio_conf->jc_set_iointr_mask)(jazzio_int_mask);
}

void
jazzio_intr_disestablish(int intr)
{
       struct jazzio_intrhand *jirp;

       jazzio_int_mask &= ~(1 << intr);
       jirp = &jazzio_intrtab[intr];
       jirp->ih_func = jazzio_no_handler;
       jirp->ih_arg = NULL;
       evcnt_detach(&jirp->ih_evcnt);

       (*jazzio_conf->jc_set_iointr_mask)(jazzio_int_mask);
}

static int
jazzio_no_handler(void *arg)
{

       panic("uncaught jazzio interrupt with arg %p", arg);
}

/*
*   Handle jazz i/o interrupt.
*/
uint32_t
jazzio_intr(uint32_t mask, struct clockframe *cf)
{
       unsigned int vector;
       struct jazzio_intrhand *jirp;

       while ((vector = inb(jazzio_conf->jc_iointr_status_reg)) != 0) {
               jirp = &jazzio_intrtab[(vector >> 2) - 1];
               (*jirp->ih_func)(jirp->ih_arg);
               jirp->ih_evcnt.ev_count++;
       }
       return MIPS_INT_MASK_1;
}

void
jazzio_reset(void)
{

       arc_sysreset(PICA_SYS_KBD, JAZZIO_KBCMDP);
}

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