1 /* $NetBSD: obio_space.c,v 1.6 2023/04/21 14:58:34 skrll Exp $ */
2
3 /*
4 * Copyright (c) 2001, 2002, 2003 Wasabi Systems, Inc.
5 * All rights reserved.
6 *
7 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed for the NetBSD Project by
20 * Wasabi Systems, Inc.
21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22 * or promote products derived from this software without specific prior
23 * written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38 /*
39 * bus_space functions for IQ80321 on-board devices
40 */
41
42 #include <sys/cdefs.h>
43 __KERNEL_RCSID(0, "$NetBSD: obio_space.c,v 1.6 2023/04/21 14:58:34 skrll Exp $");
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47
48 #include <uvm/uvm_extern.h>
49
50 #include <sys/bus.h>
51
52 /* Prototypes for all the bus_space structure functions */
53 bs_protos(obio);
54 bs_protos(generic);
55 bs_protos(generic_armv4);
56 bs_protos(bs_notimpl);
57
58 /*
59 * The obio bus space tag. This is constant for all instances, so
60 * we never have to explicitly "create" it.
61 */
62 struct bus_space obio_bs_tag = {
63 /* cookie */
64 .bs_cookie = (void *) 0,
65
66 /* mapping/unmapping */
67 .bs_map = obio_bs_map,
68 .bs_unmap = obio_bs_unmap,
69 .bs_subregion = obio_bs_subregion,
70
71 /* allocation/deallocation */
72 .bs_alloc = obio_bs_alloc,
73 .bs_free = obio_bs_free,
74
75 /* get kernel virtual address */
76 .bs_vaddr = obio_bs_vaddr,
77
78 /* mmap */
79 .bs_mmap = bs_notimpl_bs_mmap,
80
81 /* barrier */
82 .bs_barrier = obio_bs_barrier,
83
84 /* read (single) */
85 .bs_r_1 = generic_bs_r_1,
86 .bs_r_2 = generic_armv4_bs_r_2,
87 .bs_r_4 = generic_bs_r_4,
88 .bs_r_8 = bs_notimpl_bs_r_8,
89
90 /* read multiple */
91 .bs_rm_1 = generic_bs_rm_1,
92 .bs_rm_2 = generic_armv4_bs_rm_2,
93 .bs_rm_4 = bs_notimpl_bs_rm_4,
94 .bs_rm_8 = bs_notimpl_bs_rm_8,
95
96 /* read region */
97 .bs_rr_1 = generic_bs_rr_1,
98 .bs_rr_2 = bs_notimpl_bs_rr_2,
99 .bs_rr_4 = bs_notimpl_bs_rr_4,
100 .bs_rr_8 = bs_notimpl_bs_rr_8,
101
102 /* write (single) */
103 .bs_w_1 = generic_bs_w_1,
104 .bs_w_2 = generic_armv4_bs_w_2,
105 .bs_w_4 = generic_bs_w_4,
106 .bs_w_8 = bs_notimpl_bs_w_8,
107
108 /* write multiple */
109 .bs_wm_1 = generic_bs_wm_1,
110 .bs_wm_2 = generic_armv4_bs_wm_2,
111 .bs_wm_4 = bs_notimpl_bs_wm_4,
112 .bs_wm_8 = bs_notimpl_bs_wm_8,
113
114 /* write region */
115 .bs_wr_1 = bs_notimpl_bs_wr_1,
116 .bs_wr_2 = bs_notimpl_bs_wr_2,
117 .bs_wr_4 = bs_notimpl_bs_wr_4,
118 .bs_wr_8 = bs_notimpl_bs_wr_8,
119
120 /* set multiple */
121 .bs_sm_1 = bs_notimpl_bs_sm_1,
122 .bs_sm_2 = bs_notimpl_bs_sm_2,
123 .bs_sm_4 = bs_notimpl_bs_sm_4,
124 .bs_sm_8 = bs_notimpl_bs_sm_8,
125
126 /* set region */
127 .bs_sr_1 = bs_notimpl_bs_sr_1,
128 .bs_sr_2 = bs_notimpl_bs_sr_2,
129 .bs_sr_4 = bs_notimpl_bs_sr_4,
130 .bs_sr_8 = bs_notimpl_bs_sr_8,
131
132 /* copy */
133 .bs_c_1 = bs_notimpl_bs_c_1,
134 .bs_c_2 = bs_notimpl_bs_c_2,
135 .bs_c_4 = bs_notimpl_bs_c_4,
136 .bs_c_8 = bs_notimpl_bs_c_8,
137 };
138
139 int
obio_bs_map(void * t,bus_addr_t bpa,bus_size_t size,int flag,bus_space_handle_t * bshp)140 obio_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int flag,
141 bus_space_handle_t *bshp)
142 {
143 const struct pmap_devmap *pd;
144 paddr_t startpa, endpa, pa, offset;
145 vaddr_t va;
146
147 if ((pd = pmap_devmap_find_pa(bpa, size)) != NULL) {
148 /* Device was statically mapped. */
149 *bshp = pd->pd_va + (bpa - pd->pd_pa);
150 return 0;
151 }
152
153 endpa = round_page(bpa + size);
154 offset = bpa & PAGE_MASK;
155 startpa = trunc_page(bpa);
156
157 va = uvm_km_alloc(kernel_map, endpa - startpa, 0,
158 UVM_KMF_VAONLY | UVM_KMF_NOWAIT);
159 if (va == 0)
160 return ENOMEM;
161
162 *bshp = va + offset;
163
164 const int pmapflags =
165 (flag & (BUS_SPACE_MAP_CACHEABLE|BUS_SPACE_MAP_PREFETCHABLE))
166 ? 0
167 : PMAP_NOCACHE;
168
169 for (pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) {
170 pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE, pmapflags);
171 }
172 pmap_update(pmap_kernel());
173
174 return 0;
175 }
176
177 int
obio_bs_alloc(void * t,bus_addr_t rstart,bus_addr_t rend,bus_size_t size,bus_size_t alignment,bus_size_t boundary,int flags,bus_addr_t * bpap,bus_space_handle_t * bshp)178 obio_bs_alloc(void *t, bus_addr_t rstart, bus_addr_t rend, bus_size_t size,
179 bus_size_t alignment, bus_size_t boundary, int flags, bus_addr_t *bpap,
180 bus_space_handle_t *bshp)
181 {
182
183 panic("obio_bs_alloc(): not implemented");
184 }
185
186
187 void
obio_bs_unmap(void * t,bus_space_handle_t bsh,bus_size_t size)188 obio_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size)
189 {
190 vaddr_t va, endva;
191
192 if (pmap_devmap_find_va(bsh, size) != NULL) {
193 /* Device was statically mapped; nothing to do. */
194 return;
195 }
196
197 endva = round_page(bsh + size);
198 va = trunc_page(bsh);
199
200 pmap_kremove(va, endva - va);
201 uvm_km_free(kernel_map, va, endva - va, UVM_KMF_VAONLY);
202 }
203
204 void
obio_bs_free(void * t,bus_space_handle_t bsh,bus_size_t size)205 obio_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size)
206 {
207
208 panic("obio_bs_free(): not implemented");
209 }
210
211 int
obio_bs_subregion(void * t,bus_space_handle_t bsh,bus_size_t offset,bus_size_t size,bus_space_handle_t * nbshp)212 obio_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset,
213 bus_size_t size, bus_space_handle_t *nbshp)
214 {
215
216 *nbshp = bsh + offset;
217 return 0;
218 }
219
220 void *
obio_bs_vaddr(void * t,bus_space_handle_t bsh)221 obio_bs_vaddr(void *t, bus_space_handle_t bsh)
222 {
223
224 return (void *)bsh;
225 }
226
227 void
obio_bs_barrier(void * t,bus_space_handle_t bsh,bus_size_t offset,bus_size_t len,int flags)228 obio_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset,
229 bus_size_t len, int flags)
230 {
231
232 /* Nothing to do. */
233 }
234