/* $NetBSD: jensenio_bus_intio.c,v 1.7 2023/12/04 00:32:10 thorpej Exp $ */

/*-
 * Copyright (c) 1999 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe.
 *
 * 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.
 */

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

__KERNEL_RCSID(0, "$NetBSD: jensenio_bus_intio.c,v 1.7 2023/12/04 00:32:10 thorpej Exp $");

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

#include <sys/bus.h>

#include <dev/eisa/eisavar.h>

#include <dev/isa/isavar.h>

#include <alpha/jensenio/jensenioreg.h>
#include <alpha/jensenio/jenseniovar.h>

/* mapping/unmapping */
int             jensenio_intio_map(void *, bus_addr_t, bus_size_t, int,
                    bus_space_handle_t *, int);
void            jensenio_intio_unmap(void *, bus_space_handle_t,
                    bus_size_t, int);
int             jensenio_intio_subregion(void *, bus_space_handle_t,
                    bus_size_t, bus_size_t, bus_space_handle_t *);

/* allocation/deallocation */
        /* Not supported for Internal space */

/* barrier */
static inline void      jensenio_intio_barrier(void *, bus_space_handle_t,
                    bus_size_t, bus_size_t, int);

/* read (single) */
static inline uint8_t   jensenio_intio_read_1(void *, bus_space_handle_t, bus_size_t);

/* read multiple */
void            jensenio_intio_read_multi_1(void *, bus_space_handle_t,
                    bus_size_t, uint8_t *, bus_size_t);

/* read region */
        /* Not supported for Internal space */

/* write (single) */
static inline void      jensenio_intio_write_1(void *, bus_space_handle_t,
                    bus_size_t, uint8_t);

/* write multiple */
void            jensenio_intio_write_multi_1(void *, bus_space_handle_t,
                    bus_size_t, const uint8_t *, bus_size_t);

/* write region */
        /* Not supported for Internal space */

/* set multiple */
void            jensenio_intio_set_multi_1(void *, bus_space_handle_t,
                    bus_size_t, uint8_t, bus_size_t);

/* set region */
        /* Not supported for Internal space */

/* copy */
        /* Not supported for Internal space */

void
jensenio_bus_intio_init(bus_space_tag_t t, void *v)
{

        /*
         * Initialize the bus space tag.
         */

        memset(t, 0, sizeof(*t));

        /* cookie */
        t->abs_cookie =         v;

        /* mapping/unmapping */
        t->abs_map =            jensenio_intio_map;
        t->abs_unmap =          jensenio_intio_unmap;
        t->abs_subregion =      jensenio_intio_subregion;

        /* barrier */
        t->abs_barrier =        jensenio_intio_barrier;

        /* read (single) */
        t->abs_r_1 =            jensenio_intio_read_1;

        /* read multiple */
        t->abs_rm_1 =           jensenio_intio_read_multi_1;

        /* write (single) */
        t->abs_w_1 =            jensenio_intio_write_1;

        /* write multiple */
        t->abs_wm_1 =           jensenio_intio_write_multi_1;

        /* set multiple */
        t->abs_sm_1 =           jensenio_intio_set_multi_1;

        /*
         * Extent map is already set up.
         */
}

int
jensenio_intio_map(void *v, bus_addr_t ioaddr, bus_size_t iosize, int flags,
    bus_space_handle_t *iohp, int acct)
{
        struct jensenio_config *jcp = v;
        int linear = flags & BUS_SPACE_MAP_LINEAR;
        int error;

        /*
         * Can't map i/o space linearly.
         */
        if (linear)
                return (EOPNOTSUPP);

        if (acct) {
#ifdef EXTENT_DEBUG
                printf("intio: allocating 0x%lx to 0x%lx\n", ioaddr,
                    ioaddr + iosize - 1);
#endif
                error = vmem_xalloc_addr(jcp->jc_io_arena, ioaddr, iosize,
                    VM_NOSLEEP);
                if (error) {
#ifdef EXTENT_DEBUG
                        printf("intio: allocation failed (%d)\n", error);
                        /* vmem_print(jcp->jc_io_arena);        XXX */
#endif
                        return (error);
                }
        }

        *iohp = ALPHA_PHYS_TO_K0SEG((ioaddr << 9) + JENSEN_VL82C106);
        return (0);
}

void
jensenio_intio_unmap(void *v, bus_space_handle_t ioh, bus_size_t iosize,
    int acct)
{
        struct jensenio_config *jcp = v;
        bus_addr_t ioaddr;

        if (acct == 0)
                return;

#ifdef EXTENT_DEBUG
        printf("intio: freeing handle 0x%lx for 0x%lx\n", ioh, iosize);
#endif

        ioh = ALPHA_K0SEG_TO_PHYS(ioh);

        ioaddr = (ioh - JENSEN_VL82C106) >> 9;

#ifdef EXTENT_DEBUG
        printf("intio: freeing 0x%lx to 0x%lx\n", ioaddr, ioaddr + iosize - 1);
#endif
        vmem_xfree(jcp->jc_io_arena, ioaddr, iosize);
}

int
jensenio_intio_subregion(void *v, bus_space_handle_t ioh, bus_size_t offset,
    bus_size_t size, bus_space_handle_t *nioh)
{

        *nioh = ioh + (offset << 9);
        return (0);
}

static inline void
jensenio_intio_barrier(void *v, bus_space_handle_t h, bus_size_t o,
    bus_size_t l, int f)
{

        if ((f & BUS_SPACE_BARRIER_READ) != 0)
                alpha_mb();
        else if ((f & BUS_SPACE_BARRIER_WRITE) != 0)
                alpha_wmb();
}

static inline uint8_t
jensenio_intio_read_1(void *v, bus_space_handle_t ioh, bus_size_t off)
{
        register uint32_t *port;

        alpha_mb();

        port = (uint32_t *)(ioh + (off << 9));
        return (*port & 0xff);
}

void
jensenio_intio_read_multi_1(void *v, bus_space_handle_t h, bus_size_t o,
    uint8_t *a, bus_size_t c)
{

        while (c-- > 0) {
                jensenio_intio_barrier(v, h, o, sizeof *a,
                    BUS_SPACE_BARRIER_READ);
                *a++ = jensenio_intio_read_1(v, h, o);
        }
}

static inline void
jensenio_intio_write_1(void *v, bus_space_handle_t ioh, bus_size_t off,
    uint8_t val)
{
        register uint32_t *port;

        port = (uint32_t *)(ioh + (off << 9));
        *port = val;
        alpha_mb();
}

void
jensenio_intio_write_multi_1(void *v, bus_space_handle_t h, bus_size_t o,
    const uint8_t *a, bus_size_t c)
{

        while (c-- > 0) {
                jensenio_intio_write_1(v, h, o, *a++);
                jensenio_intio_barrier(v, h, o, sizeof *a,
                    BUS_SPACE_BARRIER_WRITE);
        }
}

void
jensenio_intio_set_multi_1(void *v, bus_space_handle_t h, bus_size_t o,
    uint8_t val, bus_size_t c)
{

        while (c-- > 0) {
                jensenio_intio_write_1(v, h, o, val);
                jensenio_intio_barrier(v, h, o, sizeof val,
                    BUS_SPACE_BARRIER_WRITE);
        }
}