/*      $NetBSD: vsbus.c,v 1.69 2024/02/17 17:41:43 tsutsui Exp $ */
/*
 * Copyright (c) 1996, 1999 Ludd, University of Lule}, Sweden.
 * All rights reserved.
 *
 * This code is derived from software contributed to Ludd by Bertram Barth.
 *
 * 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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vsbus.c,v 1.69 2024/02/17 17:41:43 tsutsui Exp $");

#include "opt_cputype.h"

#define _VAX_BUS_DMA_PRIVATE

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

#include <uvm/uvm_extern.h>

#include <machine/sid.h>
#include <machine/scb.h>
#include <machine/nexus.h>

#include <machine/uvax.h>
#include <machine/ka410.h>
#include <machine/ka420.h>
#include <machine/ka43.h>

#include <machine/mainbus.h>
#include <machine/vsbus.h>

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

static int      vsbus_match(device_t, cfdata_t, void *);
static void     vsbus_attach(device_t, device_t, void *);
static int      vsbus_print(void *, const char *);
static int      vsbus_search(device_t, cfdata_t, const int *, void *);

static SIMPLEQ_HEAD(, vsbus_dma) vsbus_dma;

CFATTACH_DECL_NEW(vsbus, sizeof(struct vsbus_softc),
    vsbus_match, vsbus_attach, NULL, NULL);

static struct vax_bus_dma_tag vsbus_bus_dma_tag = {
        ._dmamap_create         = _bus_dmamap_create,
        ._dmamap_destroy        = _bus_dmamap_destroy,
        ._dmamap_load           = _bus_dmamap_load,
        ._dmamap_load_mbuf      = _bus_dmamap_load_mbuf,
        ._dmamap_load_uio       = _bus_dmamap_load_uio,
        ._dmamap_load_raw       = _bus_dmamap_load_raw,
        ._dmamap_unload         = _bus_dmamap_unload,
        ._dmamap_sync           = _bus_dmamap_sync,
        ._dmamem_alloc          = _bus_dmamem_alloc,
        ._dmamem_free           = _bus_dmamem_free,
        ._dmamem_map            = _bus_dmamem_map,
        ._dmamem_unmap          = _bus_dmamem_unmap,
        ._dmamem_mmap           = _bus_dmamem_mmap,
};

int
vsbus_print(void *aux, const char *name)
{
        struct vsbus_attach_args * const va = aux;

        aprint_normal(" csr 0x%lx vec %o ipl %x maskbit %d", va->va_paddr,
            va->va_cvec & 511, va->va_br, va->va_maskno - 1);
        return UNCONF;
}

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

        return !strcmp("vsbus", ma->ma_type);
}

void
vsbus_attach(device_t parent, device_t self, void *aux)
{
        struct mainbus_attach_args * const ma = aux;
        struct vsbus_softc *sc = device_private(self);
        int dbase, dsize;

        aprint_normal("\n");

        sc->sc_dev = self;
        sc->sc_iot = ma->ma_iot;
        sc->sc_dmatag = vsbus_bus_dma_tag;

        switch (vax_boardtype) {
#if VAX49 || VAX53
        case VAX_BTYP_53:
        case VAX_BTYP_49:
                sc->sc_vsregs = vax_map_physmem(VS_REGS_KA49, 1);
                sc->sc_intreq = (char *)sc->sc_vsregs + 12;
                sc->sc_intclr = (char *)sc->sc_vsregs + 12;
                sc->sc_intmsk = (char *)sc->sc_vsregs + 8;
                vsbus_dma_init(sc, 8192);
                break;
#endif

#if VAX46 || VAX48
        case VAX_BTYP_48:
        case VAX_BTYP_46:
                sc->sc_vsregs = vax_map_physmem(VS_REGS, 1);
                sc->sc_intreq = (char *)sc->sc_vsregs + 15;
                sc->sc_intclr = (char *)sc->sc_vsregs + 15;
                sc->sc_intmsk = (char *)sc->sc_vsregs + 12;
                vsbus_dma_init(sc, 32768);
                break;
#endif

        default:
                sc->sc_vsregs = vax_map_physmem(VS_REGS, 1);
                sc->sc_intreq = (char *)sc->sc_vsregs + 15;
                sc->sc_intclr = (char *)sc->sc_vsregs + 15;
                sc->sc_intmsk = (char *)sc->sc_vsregs + 12;
                if (vax_boardtype == VAX_BTYP_410) {
                        dbase = KA410_DMA_BASE;
                        dsize = KA410_DMA_SIZE;
                } else {
                        dbase = KA420_DMA_BASE;
                        dsize = KA420_DMA_SIZE;
                }
                sc->sc_dmasize = dsize;
                sc->sc_dmaaddr = uvm_km_alloc(kernel_map, dsize, 0,
                    UVM_KMF_VAONLY);
                ioaccess(sc->sc_dmaaddr, dbase, dsize/VAX_NBPG);
                break;
        }

        SIMPLEQ_INIT(&vsbus_dma);
        /*
         * First: find which interrupts we won't care about.
         * There are interrupts that interrupt on a periodic basic
         * that we don't want to interfere with the rest of the 
         * interrupt probing.
         */
        *sc->sc_intmsk = 0;
        *sc->sc_intclr = 0xff;
        DELAY(1000000); /* Wait a second */
        sc->sc_mask = *sc->sc_intreq;
        aprint_normal_dev(self, "interrupt mask %x\n", sc->sc_mask);
        /*
         * now check for all possible devices on this "bus"
         */
        config_search(self, NULL,
            CFARGS(.search = vsbus_search));

        /* Autoconfig finished, enable interrupts */
        *sc->sc_intmsk = ~sc->sc_mask;
}

int
vsbus_search(device_t parent, cfdata_t cf, const int *ldesc, void *aux)
{
        struct vsbus_softc *sc = device_private(parent);
        struct vsbus_attach_args va;
        int i, vec, br;
        u_char c;

        va.va_paddr = cf->cf_loc[VSBUSCF_CSR];
        va.va_addr = vax_map_physmem(va.va_paddr, 1);
        va.va_dmat = &sc->sc_dmatag;
        va.va_memt = sc->sc_iot;

        *sc->sc_intmsk = 0;
        *sc->sc_intclr = 0xff;
        scb_vecref(0, 0); /* Clear vector ref */

        i = config_probe(parent, cf, &va);
        vax_unmap_physmem(va.va_addr, 1);
        c = *sc->sc_intreq & ~sc->sc_mask;
        if (i == 0)
                goto forgetit;
        if (i > 10)
                c = sc->sc_mask; /* Fooling interrupt */
        else if (c == 0)
                goto forgetit;

        *sc->sc_intmsk = c;
        DELAY(100);
        *sc->sc_intmsk = 0;
        va.va_maskno = ffs((u_int)c);
        i = scb_vecref(&vec, &br);
        if (i == 0)
                goto fail;
        if (vec == 0)
                goto fail;

        va.va_br = br;
        va.va_cvec = vec;
        va.va_dmaaddr = sc->sc_dmaaddr;
        va.va_dmasize = sc->sc_dmasize;
        *sc->sc_intmsk = c; /* Allow interrupts during attach */
        config_attach(parent, cf, &va, vsbus_print, CFARGS_NONE);
        *sc->sc_intmsk = 0;
        return 0;

fail:
        printf("%s%d at %s csr 0x%x %s\n",
            cf->cf_name, cf->cf_unit, device_xname(parent),
            cf->cf_loc[VSBUSCF_CSR], (i ? "zero vector" : "didn't interrupt"));
forgetit:
        return 0;
}

/*
 * Sets a new interrupt mask. Returns the old one.
 * Works like spl functions.
 */
unsigned char
vsbus_setmask(int mask)
{
        struct vsbus_softc * const sc = device_lookup_private(&vsbus_cd, 0);
        unsigned char ch;

        if (sc == NULL)
                return 0;

        ch = *sc->sc_intmsk;
        *sc->sc_intmsk = mask;
        return ch;
}

/*
 * Clears the interrupts in mask.
 */
void
vsbus_clrintr(int mask)
{
        struct vsbus_softc * const sc = device_lookup_private(&vsbus_cd, 0);
        if (sc == NULL)
                return;

        *sc->sc_intclr = mask;
}

#define puvtopte(va, pmap) \
        (((vaddr_t)va < 0x40000000) ? \
        &(((pmap)->pm_p0br)[PG_PFNUM(va)]) : \
        &(((pmap)->pm_p1br)[PG_PFNUM(va)]))

/*
 * Copy data from/to a user process' space from the DMA area.
 * Use the physical memory directly.
 */
void
vsbus_copytoproc(struct proc *p, void *fromv, void *tov, int len)
{
        char *from = fromv, *to = tov;
        struct pmap *pm;
        struct pte *pte;
        paddr_t pa;

        if ((vaddr_t)to & KERNBASE) { /* In kernel space */
                memcpy(to, from, len);
                return;
        }

#ifdef DIAGNOSTIC
        if (p == NULL)
                panic("vsbus_copytoproc: no proc");
#endif

        pm = p->p_vmspace->vm_map.pmap;
        pte = puvtopte(trunc_page((vaddr_t)to), pm);
        if ((vaddr_t)to & PGOFSET) {
                int cz = round_page((vaddr_t)to) - (vaddr_t)to;

                pa = (pte->pg_pfn << VAX_PGSHIFT) | (PAGE_SIZE - cz) | KERNBASE;
                memcpy((void *)pa, from, uimin(cz, len));
                from += cz;
                to += cz;
                len -= cz;
                pte += 8; /* XXX */
        }
        while (len > 0) {
                pa = (pte->pg_pfn << VAX_PGSHIFT) | KERNBASE;
                memcpy((void *)pa, from, uimin(PAGE_SIZE, len));
                from += PAGE_SIZE;
                to += PAGE_SIZE;
                len -= PAGE_SIZE;
                pte += 8; /* XXX */
        }
}

void
vsbus_copyfromproc(struct proc *p, void *fromv, void *tov, int len)
{
        char *from = fromv, *to = tov;
        struct pmap *pm;
        struct pte *pte;
        paddr_t pa;

        if ((vaddr_t)from & KERNBASE) { /* In kernel space */
                memcpy(to, from, len);
                return;
        }

#ifdef DIAGNOSTIC
        if (p == NULL)
                panic("vsbus_copyfromproc: no proc");
#endif

        pm = p->p_vmspace->vm_map.pmap;
        pte = puvtopte(trunc_page((vaddr_t)from), pm);
        if ((vaddr_t)from & PGOFSET) {
                int cz = round_page((vaddr_t)from) - (vaddr_t)from;

                pa = (pte->pg_pfn << VAX_PGSHIFT) | (PAGE_SIZE - cz) | KERNBASE;
                memcpy(to, (void *)pa, uimin(cz, len));
                from += cz;
                to += cz;
                len -= cz;
                pte += 8; /* XXX */
        }
        while (len > 0) {
                pa = (pte->pg_pfn << VAX_PGSHIFT) | KERNBASE;
                memcpy(to,  (void *)pa, uimin(PAGE_SIZE, len));
                from += PAGE_SIZE;
                to += PAGE_SIZE;
                len -= PAGE_SIZE;
                pte += 8; /* XXX */
        }
}

/* 
 * There can only be one user of the DMA area on VS2k/VS3100 at one
 * time, so keep track of it here.
 */ 
static int vsbus_active = 0;

void
vsbus_dma_start(struct vsbus_dma *vd)
{
 
        SIMPLEQ_INSERT_TAIL(&vsbus_dma, vd, vd_q);

        if (vsbus_active == 0)
                vsbus_dma_intr();
}
 
void
vsbus_dma_intr(void)
{       
        struct vsbus_dma *vd;
        
        vd = SIMPLEQ_FIRST(&vsbus_dma);
        if (vd == NULL) {
                vsbus_active = 0;
                return;
        }
        vsbus_active = 1;
        SIMPLEQ_REMOVE_HEAD(&vsbus_dma, vd_q);
        (*vd->vd_go)(vd->vd_arg);
}