/* $NetBSD: mcbus.c,v 1.26 2023/06/19 08:40:29 msaitoh Exp $ */

/*
* Copyright (c) 1998 by Matthew Jacob
* NASA AMES Research Center.
* 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 immediately at the beginning of the file, without modification,
*    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 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 AUTHOR 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.
*/

/*
* Autoconfiguration routines for the MCBUS system
* bus found on AlphaServer 4100 systems.
*/

#include <sys/cdefs.h>                  /* RCS ID & Copyright macro defns */

__KERNEL_RCSID(0, "$NetBSD: mcbus.c,v 1.26 2023/06/19 08:40:29 msaitoh Exp $");

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

#include <machine/autoconf.h>
#include <machine/rpb.h>
#include <machine/pte.h>

#include <alpha/mcbus/mcbusreg.h>
#include <alpha/mcbus/mcbusvar.h>

#include <alpha/pci/mcpciareg.h>

#include "locators.h"

#define KV(_addr)       ((void *)ALPHA_PHYS_TO_K0SEG((_addr)))
#define MCPCIA_EXISTS(mid, gid) \
       (!badaddr((void *)KV(MCPCIA_BRIDGE_ADDR(gid, mid)), sizeof (uint32_t)))

extern struct cfdriver mcbus_cd;

struct mcbus_cpu_busdep mcbus_primary;

static int      mcbusmatch(device_t, cfdata_t, void *);
static void     mcbusattach(device_t, device_t, void *);
static int      mcbusprint(void *, const char *);
static const char *mcbus_node_type_str(uint8_t);

typedef struct {
       uint8_t mcbus_types[MCBUS_MID_MAX];
} mcbus_softc_t;

CFATTACH_DECL_NEW(mcbus, sizeof (mcbus_softc_t),
   mcbusmatch, mcbusattach, NULL, NULL);

/*
* Tru64 UNIX (formerly Digital UNIX (formerly DEC OSF/1)) probes for MCPCIAs
* in the following order:
*
*      5, 4, 7, 6
*
* This is so that the built-in CD-ROM on the internal 53c810 is always
* dka500.  We probe them in the same order, for consistency.
*/
const int mcbus_mcpcia_probe_order[] = { 5, 4, 7, 6 };

extern void mcpcia_config_cleanup(void);

static int
mcbusprint(void *aux, const char *cp)
{
       struct mcbus_dev_attach_args *tap = aux;
       aprint_normal(" mid %d: %s", tap->ma_mid,
           mcbus_node_type_str(tap->ma_type));
       return (UNCONF);
}

static int
mcbusmatch(device_t parent, cfdata_t cf, void *aux)
{
       struct mainbus_attach_args *ma = aux;

       /* Make sure we're looking for a MCBUS. */
       if (strcmp(ma->ma_name, mcbus_cd.cd_name) != 0)
               return (0);

       /*
        * Only available on 4100 processor type platforms.
        */
       if (cputype != ST_DEC_4100)
               return (0);
       return (1);
}

static void
mcbusattach(device_t parent, device_t self, void *aux)
{
       static const char * const bcs[CPU_BCacheMask + 1] = {
               "No", "1MB", "2MB", "4MB",
       };
       struct mcbus_dev_attach_args ta;
       mcbus_softc_t *mbp = device_private(self);
       int i, mid;
       int locs[MCBUSCF_NLOCS];

       printf(": %s BCache\n", mcbus_primary.mcbus_valid ?
           bcs[mcbus_primary.mcbus_bcache] : "Unknown");

       mbp->mcbus_types[0] = MCBUS_TYPE_RES;
       for (mid = 1; mid < MCBUS_MID_MAX; ++mid)
               mbp->mcbus_types[mid] = MCBUS_TYPE_UNK;

       /*
        * Find and "configure" memory.
        */

       /*
        * XXX If we ever support more than one MCBUS, we'll
        * XXX have to probe for them, and map them to unit
        * XXX numbers.
        */
       ta.ma_gid = MCBUS_GID_FROM_INSTANCE(0);
       ta.ma_mid = 1;
       ta.ma_type = MCBUS_TYPE_MEM;
       mbp->mcbus_types[1] = MCBUS_TYPE_MEM;
       locs[MCBUSCF_MID] = 1;
       config_found(self, &ta, mcbusprint,
           CFARGS(.submatch = config_stdsubmatch,
                  .locators = locs));

       /*
        * Now find PCI busses.
        */
       for (i = 0; i < MCPCIA_PER_MCBUS; i++) {
               mid = mcbus_mcpcia_probe_order[i];
               /*
                * XXX If we ever support more than one MCBUS, we'll
                * XXX have to probe for them, and map them to unit
                * XXX numbers.
                */
               ta.ma_gid = MCBUS_GID_FROM_INSTANCE(0);
               ta.ma_mid = mid;
               ta.ma_type = MCBUS_TYPE_PCI;
               locs[MCBUSCF_MID] = mid;
               if (MCPCIA_EXISTS(ta.ma_mid, ta.ma_gid))
                       config_found(self, &ta, mcbusprint,
                           CFARGS(.submatch = config_stdsubmatch,
                                  .locators = locs));
       }

#if 0
       /*
        * Deal with hooking CPU instances to MCBUS module ids.
        *
        * Note that we do this here because it's the read of
        * stupid MCPCIA WHOAMI register that can get us the
        * module ID and type of the configuring CPU.
        */

       if (mcbus_primary.mcbus_valid) {
               mid = mcbus_primary.mcbus_cpu_mid;
               printf("%s mid %d: %s %s\n", device_xname(self),
                   mid, mcbus_node_type_str(MCBUS_TYPE_CPU),
                   bcs[mcbus_primary.mcbus_bcache & 0x7]);
               /*
                * XXX If we ever support more than one MCBUS, we'll
                * XXX have to probe for them, and map them to unit
                * XXX numbers.
                */
               ta.ma_gid = MCBUS_GID_FROM_INSTANCE(0);
               ta.ma_mid = mid;
               ta.ma_type = MCBUS_TYPE_CPU;
               mbp->mcbus_types[mid] = MCBUS_TYPE_CPU;
               locs[MCBUSCF_MID] = mid;
               config_found(self, &ta, mcbusprint,
                   CFARGS(.submatch = config_stdsubmatch,
                          .locators = locs));
       }
#endif

       /*
        * Now clean up after configuring everything.
        *
        * This is an unfortunate layering violation- but
        * we can't enable interrupts until *all* probing
        * is done, but the code and knowledge to clean
        * up after probing and to enable interrupts is
        * down in the MCPCIA layer.
        */
       mcpcia_config_cleanup();
}

static const char *
mcbus_node_type_str(uint8_t type)
{
       switch (type) {
       case MCBUS_TYPE_RES:
               panic ("RESERVED TYPE IN MCBUS_NODE_TYPE_STR");
               break;
       case MCBUS_TYPE_UNK:
               panic ("UNKNOWN TYPE IN MCBUS_NODE_TYPE_STR");
               break;
       case MCBUS_TYPE_MEM:
               return ("Memory");
       case MCBUS_TYPE_CPU:
               return ("CPU");
       case MCBUS_TYPE_PCI:
               return ("PCI Bridge");
       default:
               panic("REALLY UNKNOWN (%x) TYPE IN MCBUS_NODE_TYPE_STR", type);
               break;
       }
}

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