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      1 /*	$NetBSD: bus_mem.c,v 1.14 2017/05/22 16:39:40 ragge Exp $ */
      2 /*
      3  * Copyright (c) 1998 Matt Thomas
      4  * All rights reserved.
      5  *
      6  * This code is derived from software contributed to Ludd by Bertram Barth.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: bus_mem.c,v 1.14 2017/05/22 16:39:40 ragge Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/systm.h>
     34 #include <sys/types.h>
     35 #include <sys/cpu.h>
     36 #include <sys/bus.h>
     37 #include <sys/device.h>
     38 #include <sys/intr.h>
     39 #include <sys/kernel.h>
     40 
     41 #include <uvm/uvm_extern.h>
     42 
     43 
     44 static int
     45 vax_mem_bus_space_map(
     46 	void *t,
     47 	bus_addr_t pa,
     48 	bus_size_t size,
     49 	int cacheable,
     50 	bus_space_handle_t *bshp,
     51 	int f2)
     52 {
     53 	vaddr_t va;
     54 
     55 	size += (pa & VAX_PGOFSET);	/* have to include the byte offset */
     56 	va = uvm_km_alloc(kernel_map, size, 0, UVM_KMF_VAONLY | UVM_KMF_NOWAIT);
     57 	if (va == 0)
     58 		return (ENOMEM);
     59 
     60 	*bshp = (bus_space_handle_t)(va + (pa & VAX_PGOFSET));
     61 
     62 	ioaccess(va, pa, (size + VAX_NBPG - 1) >> VAX_PGSHIFT);
     63 
     64 	return 0;
     65 }
     66 
     67 static int
     68 vax_mem_bus_space_subregion(
     69 	void *t,
     70 	bus_space_handle_t h,
     71 	bus_size_t o,
     72 	bus_size_t s,
     73 	bus_space_handle_t *hp)
     74 {
     75 	*hp = h + o;
     76 	return (0);
     77 }
     78 
     79 static void
     80 vax_mem_bus_space_unmap(
     81 	void *t,
     82 	bus_space_handle_t h,
     83 	bus_size_t size,
     84 	int f)
     85 {
     86 	u_long va = trunc_page(h);
     87 	u_long endva = round_page(h + size);
     88 
     89         /*
     90          * Free the kernel virtual mapping.
     91          */
     92 	iounaccess(va, size >> VAX_PGSHIFT);
     93 	uvm_km_free(kernel_map, va, endva - va, UVM_KMF_VAONLY);
     94 }
     95 
     96 static int
     97 vax_mem_bus_space_alloc(
     98 	void *t,
     99 	bus_addr_t rs,
    100 	bus_addr_t re,
    101 	bus_size_t s,
    102 	bus_size_t a,
    103 	bus_size_t b,
    104 	int f,
    105 	bus_addr_t *ap,
    106 	bus_space_handle_t *hp)
    107 {
    108 	panic("vax_mem_bus_alloc not implemented");
    109 }
    110 
    111 static void
    112 vax_mem_bus_space_free(
    113 	void *t,
    114 	bus_space_handle_t h,
    115 	bus_size_t s)
    116 {
    117 	panic("vax_mem_bus_free not implemented");
    118 }
    119 
    120 static paddr_t
    121 vax_mem_bus_space_mmap(void *v, bus_addr_t addr, off_t off, int prot, int flags)
    122 {
    123 	bus_addr_t rv;
    124 
    125 	rv = addr + off;
    126 	return btop(rv);
    127 }
    128 
    129 struct vax_bus_space vax_mem_bus_space = {
    130 	NULL,
    131 	vax_mem_bus_space_map,
    132 	vax_mem_bus_space_unmap,
    133 	vax_mem_bus_space_subregion,
    134 	vax_mem_bus_space_alloc,
    135 	vax_mem_bus_space_free,
    136 	vax_mem_bus_space_mmap,
    137 };
    138