/*      $NetBSD: pq3obio.c,v 1.7 2021/08/07 16:19:02 thorpej Exp $      */
/*-
* Copyright (c) 2010, 2011 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Raytheon BBN Technologies Corp and Defense Advanced Research Projects
* Agency and which was developed by Matt Thomas of 3am Software Foundry.
*
* This material is based upon work supported by the Defense Advanced Research
* Projects Agency and Space and Naval Warfare Systems Center, Pacific, under
* Contract No. N66001-09-C-2073.
* Approved for Public Release, Distribution Unlimited
*
* 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.
*/

#define LBC_PRIVATE

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pq3obio.c,v 1.7 2021/08/07 16:19:02 thorpej Exp $");

#include "locators.h"

#include <sys/param.h>
#include <sys/device.h>
#include <sys/kmem.h>
#include <sys/bus.h>
#include <sys/extent.h>

#include <powerpc/booke/cpuvar.h>
#include <powerpc/booke/e500var.h>
#include <powerpc/booke/e500reg.h>
#include <powerpc/booke/obiovar.h>

#define OBIO_PORTS      8

static int pq3obio_match(device_t, cfdata_t, void *);
static void pq3obio_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(pq3obio, sizeof(struct pq3obio_softc),
  pq3obio_match, pq3obio_attach, NULL, NULL);

static int
pq3obio_match(device_t parent, cfdata_t cf, void *aux)
{

       if (!e500_cpunode_submatch(parent, cf, "lbc", aux))
               return 0;

       return 1;
}

static int
pq3obio_print(void *aux, const char *pnp)
{
       struct generic_attach_args * const ga = aux;

       if (pnp)
               aprint_normal(" at %s", pnp);

       if (ga->ga_cs != OBIOCF_CS_DEFAULT)
               aprint_normal(" cs %d", ga->ga_cs);

       if (ga->ga_addr != OBIOCF_ADDR_DEFAULT) {
               aprint_normal(" addr %#x", ga->ga_addr);
               if (ga->ga_size != OBIOCF_SIZE_DEFAULT)
                       aprint_normal(" size %#x", ga->ga_size);
       }
       if (ga->ga_irq != OBIOCF_IRQ_DEFAULT)
               aprint_normal(" irq %d", ga->ga_irq);

       return UNCONF;
}

static int
pq3obio_search(device_t parent, cfdata_t cf, const int *slocs, void *aux)
{
       struct pq3obio_softc * const sc = device_private(parent);
       struct generic_attach_args ga;
       bool tryagain;

       do {
               const struct pq3lbc_softc *lbc;
               ga.ga_name = "obio";
               ga.ga_addr = cf->cf_loc[OBIOCF_ADDR];
               ga.ga_size = cf->cf_loc[OBIOCF_SIZE];
               ga.ga_irq = cf->cf_loc[OBIOCF_IRQ];
               ga.ga_cs = cf->cf_loc[OBIOCF_CS];
               ga.ga_bst = &sc->sc_obio_bst;

               if (ga.ga_cs != OBIOCF_CS_DEFAULT) {
                       lbc = &sc->sc_lbcs[ga.ga_cs];
                       if ((u_int) ga.ga_cs >= __arraycount(sc->sc_lbcs))
                               return 0;
                       if (ga.ga_addr != OBIOCF_ADDR_DEFAULT) {
                               if (ga.ga_addr < lbc->lbc_base
                                   || ga.ga_addr > lbc->lbc_limit)
                                       return 0;
                       } else {
                               ga.ga_addr = lbc->lbc_base;
                       }
               } else {
                       u_int cs;
                       if (ga.ga_addr == OBIOCF_ADDR_DEFAULT)
                               return 0;
                       for (cs = 0, lbc = sc->sc_lbcs;
                            cs < __arraycount(sc->sc_lbcs);
                            cs++, lbc++) {
                               if (ga.ga_addr >= lbc->lbc_base
                                   && ga.ga_addr <= lbc->lbc_limit) {
                                       ga.ga_cs = cs;
                                       break;
                               }
                       }
                       if (ga.ga_cs == OBIOCF_CS_DEFAULT)
                               return 0;
               }

               if (ga.ga_size != OBIOCF_SIZE_DEFAULT) {
                       if (ga.ga_size >= lbc->lbc_limit - ga.ga_addr)
                               return 0;
               } else {
                       ga.ga_size = lbc->lbc_limit + 1 - lbc->lbc_base;
               }

               tryagain = false;
               if (config_probe(parent, cf, &ga)) {
                       int floc[OBIOCF_NLOCS] = {
                           [OBIOCF_ADDR] = ga.ga_addr,
                           [OBIOCF_SIZE] = ga.ga_size,
                           [OBIOCF_IRQ] = ga.ga_irq,
                           [OBIOCF_CS] = ga.ga_cs,
                       };
                       config_attach(parent, cf, &ga, pq3obio_print,
                           CFARGS(.locators = floc));
                       tryagain = (cf->cf_fstate == FSTATE_STAR);
               }
       } while (tryagain);

       return (0);
}

static const char br_msel_strings[8][6] = {
   [__SHIFTOUT(BR_MSEL_GPCM,BR_MSEL)] = "GPCM",
   [__SHIFTOUT(BR_MSEL_FCM,BR_MSEL)] = "FCM",
   [__SHIFTOUT(BR_MSEL_SDRAM,BR_MSEL)] = "SDRAM",
   [__SHIFTOUT(BR_MSEL_UPMA,BR_MSEL)] = "UPMA",
   [__SHIFTOUT(BR_MSEL_UPMB,BR_MSEL)] = "UPMB",
   [__SHIFTOUT(BR_MSEL_UPMC,BR_MSEL)] = "UPMC",
};

static void
pq3obio_attach(device_t parent, device_t self, void *aux)
{
       struct cpunode_softc * const psc = device_private(parent);
       struct pq3obio_softc * const sc = device_private(self);
       struct cpunode_attach_args * const cna = aux;
       struct cpunode_locators * const cnl = &cna->cna_locs;
       struct powerpc_bus_space * const t = &sc->sc_obio_bst;
       u_int found = 0;
       int error;

       psc->sc_children |= cna->cna_childmask;
       sc->sc_dev = self;
       sc->sc_bst = cna->cna_memt;

       error = bus_space_map(sc->sc_bst, cnl->cnl_addr, cnl->cnl_size, 0,
               &sc->sc_bsh);
       if (error) {
               aprint_error("failed to map registers: %d\n", error);
               return;
       }

       for (u_int i = 0; i < OBIO_PORTS; i++) {
               struct pq3lbc_softc * const lbc = &sc->sc_lbcs[i];
               uint32_t br = bus_space_read_4(sc->sc_bst, sc->sc_bsh, BRn(i));
               if (br & BR_V) {
                       found++;
                       lbc->lbc_br = br;
                       lbc->lbc_or = bus_space_read_4(sc->sc_bst,
                           sc->sc_bsh, ORn(i));
                       lbc->lbc_base = lbc->lbc_br & BR_BA & lbc->lbc_or;
                       lbc->lbc_limit = lbc->lbc_base + ~(lbc->lbc_or & OR_AM);
               }
       }

       aprint_normal(": %u of 8 ports enabled\n", found);
       if (found == 0)
               return;

       t->pbs_base = 0xffffffff;
       t->pbs_limit = 0;
       t->pbs_flags = _BUS_SPACE_BIG_ENDIAN;

       u_int sorted[OBIO_PORTS];
       u_int nsorted = 0;

       for (u_int i = 0; i < OBIO_PORTS; i++) {
               struct pq3lbc_softc * const lbc = &sc->sc_lbcs[i];
               if ((lbc->lbc_br & BR_V) == 0)
                       continue;

               u_int j;
               for (j = 0; j < nsorted; j++) {
                       if (lbc->lbc_base < sc->sc_lbcs[sorted[j]].lbc_base)
                               break;
               }
               for (u_int k = ++nsorted; k > j; k--) {
                       sorted[k] = sorted[k - 1];
               }
               sorted[j] = i;

               if (lbc->lbc_base < t->pbs_base)
                       t->pbs_base = lbc->lbc_base;
               if (lbc->lbc_limit > t->pbs_limit)
                       t->pbs_limit = lbc->lbc_limit;
#if 0
               aprint_normal_dev(sc->sc_dev,
                   "cs%u: br=%#x or=%#x", i, lbc->lbc_br, lbc->lbc_or);
#endif
               u_int n = ffs(~(lbc->lbc_or & OR_AM) + 1) - 1;
               aprint_normal_dev(sc->sc_dev,
                   "cs%u: %u%cB %u-bit %s region at %#x\n",
                   i,
                   1 << (n % 10), " KMGTPE"[n / 10],
                   1 << (__SHIFTOUT(lbc->lbc_br, BR_PS) + 2),
                   br_msel_strings[__SHIFTOUT(lbc->lbc_br,BR_MSEL)],
                   lbc->lbc_base);
       }

       error = bus_space_init(t, device_xname(sc->sc_dev), NULL, 0);
       if (error) {
               aprint_error_dev(sc->sc_dev,
                   "failed to initialize obio bus space: %d\n", error);
               return;
       }

       /*
        * We've created a bus space which covers all the chip selects
        * but there might be gaps inbetween them.  We need to make sure
        * bus_space_map will fail for those.  To do that, we reserve
        * the gaps between the chip-selects.
        */
       for (u_int i = 1; i < found; i++) {
               struct pq3lbc_softc * const lbc_lo = &sc->sc_lbcs[sorted[i-1]];
               struct pq3lbc_softc * const lbc_hi = &sc->sc_lbcs[sorted[i]];
               if (lbc_lo->lbc_limit + 1 == lbc_hi->lbc_base)
                       continue;
               error = extent_alloc_region(t->pbs_extent,
                   lbc_lo->lbc_limit + 1,
                   lbc_hi->lbc_base - (lbc_lo->lbc_limit + 1), 0);
               if (error) {
                       aprint_error_dev(sc->sc_dev,
                           "failed to reserve %#x..%#x: %d\n",
                           lbc_lo->lbc_limit + 1,
                           lbc_hi->lbc_base - 1,
                           error);
                       return;
               }
       }

       /*
        * Now we can do the device configuration to find what might
        * be using obio.
        */
       int locs[OBIOCF_NLOCS];
       locs[OBIOCF_ADDR] = OBIOCF_ADDR_DEFAULT;
       locs[OBIOCF_SIZE] = OBIOCF_SIZE_DEFAULT;
       locs[OBIOCF_CS] = OBIOCF_CS_DEFAULT;
       config_search(self, NULL,
           CFARGS(.search = pq3obio_search,
                  .locators = locs));
}

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