1 /* $NetBSD: bus_space_sparse.c,v 1.21 2023/12/20 06:36:02 thorpej Exp $ */
2 /* NetBSD: bus_machdep.c,v 1.1 2000/01/26 18:48:00 drochner Exp */
3
4 /*-
5 * Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by Charles M. Hannum and by Jason R. Thorpe of the Numerical Aerospace
10 * Simulation Facility, NASA Ames Research Center.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 /*
35 * For sparse bus space
36 *
37 * This bus_space uses KSEG2 mapping, if the physical address is not
38 * accessible via KSEG0/KSEG1.
39 */
40
41 #include <sys/cdefs.h>
42 __KERNEL_RCSID(0, "$NetBSD: bus_space_sparse.c,v 1.21 2023/12/20 06:36:02 thorpej Exp $");
43
44 #include <sys/param.h>
45 #include <sys/bus.h>
46 #include <sys/systm.h>
47
48 #include <uvm/uvm_extern.h>
49
50 #include <mips/locore.h>
51 #include <mips/pte.h>
52
53 extern paddr_t kvtophys(vaddr_t); /* XXX */
54
55 void
arc_sparse_bus_space_init(bus_space_tag_t bst,const char * name,paddr_t paddr,bus_addr_t start,bus_size_t size)56 arc_sparse_bus_space_init(bus_space_tag_t bst, const char *name, paddr_t paddr,
57 bus_addr_t start, bus_size_t size)
58 {
59
60 arc_bus_space_init(bst, name, paddr, ARC_BUS_SPACE_UNMAPPED,
61 start, size);
62 bst->bs_compose_handle = arc_sparse_bus_space_compose_handle;
63 bst->bs_dispose_handle = arc_sparse_bus_space_dispose_handle;
64 bst->bs_paddr = arc_sparse_bus_space_paddr;
65 }
66
67 int
arc_sparse_bus_space_compose_handle(bus_space_tag_t bst,bus_addr_t addr,bus_size_t size,int flags,bus_space_handle_t * bshp)68 arc_sparse_bus_space_compose_handle(bus_space_tag_t bst, bus_addr_t addr,
69 bus_size_t size, int flags, bus_space_handle_t *bshp)
70 {
71 bus_size_t offset = addr - bst->bs_start;
72 /*
73 * Since all buses can be linearly mappable, we don't have to check
74 * BUS_SPACE_MAP_LINEAR and BUS_SPACE_MAP_PREFETCHABLE.
75 */
76 const bool cacheable = (flags & BUS_SPACE_MAP_CACHEABLE) != 0;
77 const u_int pmap_flags = cacheable ? PMAP_WRITE_BACK : 0;
78
79 /*
80 * XXX - `bst->bs_pbase' must be page aligned,
81 * mips_trunc/round_page() cannot treat paddr_t due to overflow.
82 */
83 paddr_t start = bst->bs_pbase + mips_trunc_page(offset);
84 paddr_t end = bst->bs_pbase + mips_round_page(offset + size);
85
86 if (end <= MIPS_KSEG1_START - MIPS_KSEG0_START) {
87 /* mappable on KSEG0 or KSEG1 */
88 *bshp = (cacheable ?
89 MIPS_PHYS_TO_KSEG0(start) :
90 MIPS_PHYS_TO_KSEG1(start));
91 } else {
92 vaddr_t vaddr = uvm_km_alloc(kernel_map, (vsize_t)(end - start),
93 0, UVM_KMF_VAONLY | UVM_KMF_NOWAIT);
94
95 if (vaddr == 0)
96 panic("arc_sparse_bus_space_compose_handle: "
97 "cannot allocate KVA 0x%llx..0x%llx",
98 start, end);
99 for (vaddr_t va = vaddr; start < end;
100 start += PAGE_SIZE, va += PAGE_SIZE) {
101 pmap_kenter_pa(va, start, VM_PROT_READ|VM_PROT_WRITE,
102 pmap_flags);
103 }
104 pmap_update(pmap_kernel());
105 vaddr += (offset & PGOFSET);
106 *bshp = vaddr;
107 }
108 return 0;
109 }
110
111 int
arc_sparse_bus_space_dispose_handle(bus_space_tag_t bst,bus_space_handle_t bsh,bus_size_t size)112 arc_sparse_bus_space_dispose_handle(bus_space_tag_t bst, bus_space_handle_t bsh,
113 bus_size_t size)
114 {
115 vaddr_t start = mips_trunc_page(bsh);
116 vaddr_t end = mips_round_page(bsh + size);
117
118 if (start < MIPS_KSEG2_START) /* KSEG0/KSEG1 */
119 return 0;
120
121 pmap_kremove(start, end - start);
122 pmap_update(pmap_kernel());
123 uvm_km_free(kernel_map, start, end - start, UVM_KMF_VAONLY);
124 return 0;
125 }
126
127 int
arc_sparse_bus_space_paddr(bus_space_tag_t bst,bus_space_handle_t bsh,paddr_t * pap)128 arc_sparse_bus_space_paddr(bus_space_tag_t bst, bus_space_handle_t bsh,
129 paddr_t *pap)
130 {
131
132 *pap = kvtophys(bsh);
133 return 0;
134 }
135