/*      $NetBSD: sio16.c,v 1.28 2021/12/07 22:13:56 andvar Exp $        */

/*
* Copyright (c) 1998, 2001 Matthew R. Green
* 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 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.
*/

/*
* aurora technologies nova16 driver.  this board is an sbus card with
* an external 16 port serial box.  there are two cirrus logic cd180
* 8 port serial chips used in the implementation.
*
* thanks go to Oliver Aldulea <[email protected]> for writing the
* linux driver of this that helped clear up a couple of issues.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sio16.c,v 1.28 2021/12/07 22:13:56 andvar Exp $");

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

#include <machine/autoconf.h>

#include <dev/ic/cd18xxvar.h>
#include <dev/ic/cd18xxreg.h>

#include "ioconf.h"
#include "locators.h"

/* 1600se configuration register bits */
#define SIO16_CONFIGREG_ENABLE_IO    8
#define SIO16_CONFIGREG_ENABLE_IRQ   4

/* 1600se interrupt ackknowledge register bytes */
#define SIO16_MINT_ACK          1       /* modem interrupt acknowledge */
#define SIO16_TINT_ACK          2       /* tx interrupt acknowledge */
#define SIO16_RINT_ACK          3       /* rx interrupt acknowledge */

/*
* device cfattach and cfdriver definitions, plus the routine we pass
* to the cd18xx code or interrupt acknowledgement.
*/
static int      sio16_match(device_t, cfdata_t, void *);
static void     sio16_attach(device_t, device_t, void *);
static u_char   sio16_ackfunc(void *, int who);

/*
* define the sio16 per-device softc.
*/
struct sio16_softc {
       device_t sc_dev;

       /* sbus information */
       bus_space_tag_t sc_tag;                 /* bus tag for below */
       bus_space_handle_t sc_configreg;        /* configuration register */
       bus_space_handle_t sc_reg[2];           /* cd180 register sets */
       bus_space_handle_t sc_ack;              /* interrupt acknowledgement */
#define SIO16_1600SE    0x00000001

       u_int           sc_clk;

       /* cd180 information */
       int             sc_ncd180;

};

CFATTACH_DECL_NEW(siosixteen, sizeof(struct sio16_softc),
   sio16_match, sio16_attach, NULL, NULL);

struct sio16_attach_args {
       bus_space_tag_t         cd_tag;
       bus_space_handle_t      cd_handle;
       u_char                  (*cd_ackfunc)(void *, int);
       void                    *cd_ackfunc_arg;
       u_int                   cd_osc;
};

/*
* device match routine:  is there an sio16 present?
*
* note that we can not put "sio16" in the cfdriver, as this is an
* illegal name, so we have to hard code it here.
*/
#define SIO16_ROM_NAME  "sio16"
int
sio16_match(device_t parent, cfdata_t cf, void *aux)
{
       struct sbus_attach_args *sa = aux;

       /* does the prom think i'm an sio16? */
       if (strcmp(SIO16_ROM_NAME, sa->sa_name) != 0)
               return (0);

       return (1);
}

/*
* device attach routine:  go attach all sub devices.
*/
void
sio16_attach(device_t parent, device_t self, void *aux)
{
       struct sbus_attach_args *sa = aux;
       struct sio16_softc *sc = device_private(self);
       bus_space_handle_t h;
       char *mode, *model;
       int i;

       sc->sc_dev = self;

       if (sa->sa_nreg != 4)
               panic("sio16_attach: got %d registers instead of 4",
                   sa->sa_nreg);

       /* copy our bus tag, we will need it */
       sc->sc_tag = sa->sa_bustag;

       /*
        * sio16 has 4 register mappings.  a single byte configuration
        * register, 2 128 byte regions for the cd180 registers, and
        * a 4 byte region for interrupt acknowledgement.
        */
       if (sbus_bus_map(sa->sa_bustag,
                        sa->sa_reg[0].oa_space,
                        sa->sa_reg[0].oa_base,
                        sa->sa_reg[0].oa_size,
                        0, &h) != 0) {
               printf("%s at sbus: can not map registers 0\n",
                   device_xname(self));
               return;
       }
       sc->sc_configreg = h;
       if (sbus_bus_map(sa->sa_bustag,
                        sa->sa_reg[1].sbr_slot,
                        sa->sa_reg[1].sbr_offset,
                        sa->sa_reg[1].sbr_size,
                        0, &h) != 0) {
               printf("%s at sbus: can not map registers 1\n",
                   device_xname(self));
               return;
       }
       sc->sc_reg[0] = h;
       if (sbus_bus_map(sa->sa_bustag,
                        sa->sa_reg[2].sbr_slot,
                        sa->sa_reg[2].sbr_offset,
                        sa->sa_reg[2].sbr_size,
                        0, &h) != 0) {
               printf("%s at sbus: can not map registers 2\n",
                   device_xname(self));
               return;
       }
       sc->sc_reg[1] = h;
       if (sbus_bus_map(sa->sa_bustag,
                        sa->sa_reg[3].sbr_slot,
                        sa->sa_reg[3].sbr_offset,
                        sa->sa_reg[3].sbr_size,
                        0, &h) != 0) {
               printf("%s at sbus: can not map registers 3\n",
                   device_xname(self));
               return;
       }
       sc->sc_ack = h;

       mode = prom_getpropstring(sa->sa_node, "mode");
       if (mode)
               printf(", %s mode", mode);

       /* get the clock frequency */
       sc->sc_clk = prom_getpropint(sa->sa_node, "clk", 24000);

       model = prom_getpropstring(sa->sa_node, "model");
       if (model == 0) {
               printf(", no model property, bailing\n");
               return;
       }

       /* are we an 1600se? */
       if (strcmp(model, "1600se") == 0) {
               printf(", 16 channels");
               sc->sc_ncd180 = 2;
       } else {
               printf(", don't know model %s, bailing\n", model);
               return;
       }

       /* establish interrupt channel */
       (void)bus_intr_establish(sa->sa_bustag, sa->sa_pri, IPL_TTY,
           cd18xx_hardintr, sc);

       /* reset the board, and turn on interrupts and I/O */
       bus_space_write_1(sa->sa_bustag, sc->sc_configreg, 0, 0);
       delay(100);
       bus_space_write_1(sa->sa_bustag, sc->sc_configreg, 0,
           SIO16_CONFIGREG_ENABLE_IO | SIO16_CONFIGREG_ENABLE_IRQ |
           (((sa->sa_pri) & 0x0f) >> 2));
       delay(10000);

       printf("\n");

       /* finally, configure the clcd's underneath */
       for (i = 0; i < sc->sc_ncd180; i++) {
               struct sio16_attach_args cd;

               cd.cd_tag = sa->sa_bustag;
               cd.cd_osc = sc->sc_clk * 100;
               cd.cd_handle = (bus_space_handle_t)sc->sc_reg[i];
               cd.cd_ackfunc = sio16_ackfunc;
               cd.cd_ackfunc_arg = sc;
               (void)config_found(self, (void *)&cd, NULL, CFARGS_NONE);
       }
}

/*
* note that the addresses used in this function match those assigned
* in clcd_attach() below, or the various service match routines.
*/
u_char
sio16_ackfunc(void *v, int who)
{
       struct sio16_softc *sc = v;
       bus_size_t addr;

       switch (who) {
       case CD18xx_INTRACK_RxINT:
       case CD18xx_INTRACK_REINT:
               addr = SIO16_RINT_ACK;
               break;
       case CD18xx_INTRACK_TxINT:
               addr = SIO16_TINT_ACK;
               break;
       case CD18xx_INTRACK_MxINT:
               addr = SIO16_MINT_ACK;
               break;
       default:
               panic("%s: sio16_ackfunc: unknown ackfunc %d",
                   device_xname(sc->sc_dev), who);
       }
       return (bus_space_read_1(sc->sc_tag, sc->sc_ack, addr));
}

/*
* we attach two `clcd' instances per 1600se, that each call the
* backend cd18xx driver for help.
*/
static int      clcd_match(device_t, cfdata_t, void *);
static void     clcd_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(clcd, sizeof(struct cd18xx_softc),
   clcd_match, clcd_attach, NULL, NULL);

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

       /* XXX */
       return 1;
}

static void
clcd_attach(device_t parent, device_t self, void *aux)
{
       struct cd18xx_softc *sc = device_private(self);
       struct sio16_attach_args *args = aux;

       sc->sc_dev = self;
       sc->sc_tag = args->cd_tag;
       sc->sc_handle = args->cd_handle;
       sc->sc_osc = args->cd_osc;
       sc->sc_ackfunc = args->cd_ackfunc;
       sc->sc_ackfunc_arg = args->cd_ackfunc_arg;
       sc->sc_msmr = SIO16_MINT_ACK;
       sc->sc_tsmr = SIO16_TINT_ACK;
       sc->sc_rsmr = SIO16_RINT_ACK;

       /* call the common code */
       cd18xx_attach(sc);
}

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