1 /* $NetBSD: sa11x0_io.c,v 1.22 2023/04/21 15:00:48 skrll Exp $ */
2
3 /*
4 * Copyright (c) 1997 Mark Brinicombe.
5 * Copyright (c) 1997 Causality Limited.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by Ichiro FUKUHARA.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by Mark Brinicombe.
22 * 4. The name of the company nor the name of the author may be used to
23 * endorse or promote products derived from this software without specific
24 * prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
28 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
30 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
31 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
32 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39 /*
40 * bus_space I/O functions for sa11x0
41 */
42
43 #include <sys/cdefs.h>
44 __KERNEL_RCSID(0, "$NetBSD: sa11x0_io.c,v 1.22 2023/04/21 15:00:48 skrll Exp $");
45
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/queue.h>
49
50 #include <uvm/uvm.h>
51
52 #include <sys/bus.h>
53 #include <machine/pmap.h>
54
55 /* Prototypes for all the bus_space structure functions */
56
57 bs_protos(sa11x0);
58 bs_protos(bs_notimpl);
59
60 /* Declare the sa11x0 bus space tag */
61
62 struct bus_space sa11x0_bs_tag = {
63 /* cookie */
64 .bs_cookie = NULL,
65
66 /* mapping/unmapping */
67 .bs_map = sa11x0_bs_map,
68 .bs_unmap = sa11x0_bs_unmap,
69 .bs_subregion = sa11x0_bs_subregion,
70
71 /* allocation/deallocation */
72 .bs_alloc = sa11x0_bs_alloc,
73 .bs_free = sa11x0_bs_free,
74
75 /* get kernel virtual address */
76 .bs_vaddr = sa11x0_bs_vaddr,
77
78 /* mmap bus space for userland */
79 .bs_mmap = sa11x0_bs_mmap,
80
81 /* barrier */
82 .bs_barrier = sa11x0_bs_barrier,
83
84 /* read (single) */
85 .bs_r_1 = sa11x0_bs_r_1,
86 .bs_r_2 = sa11x0_bs_r_2,
87 .bs_r_4 = sa11x0_bs_r_4,
88 .bs_r_8 = bs_notimpl_bs_r_8,
89
90 /* read multiple */
91 .bs_rm_1 = sa11x0_bs_rm_1,
92 .bs_rm_2 = sa11x0_bs_rm_2,
93 .bs_rm_4 = sa11x0_bs_rm_4,
94 .bs_rm_8 = bs_notimpl_bs_rm_8,
95
96 /* read region */
97 .bs_rr_1 = bs_notimpl_bs_rr_1,
98 .bs_rr_2 = sa11x0_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 = sa11x0_bs_w_1,
104 .bs_w_2 = sa11x0_bs_w_2,
105 .bs_w_4 = sa11x0_bs_w_4,
106 .bs_w_8 = bs_notimpl_bs_w_8,
107
108 /* write multiple */
109 .bs_wm_1 = sa11x0_bs_wm_1,
110 .bs_wm_2 = sa11x0_bs_wm_2,
111 .bs_wm_4 = sa11x0_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 = sa11x0_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 = sa11x0_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 = sa11x0_bs_c_2,
135 .bs_c_4 = bs_notimpl_bs_c_4,
136 .bs_c_8 = bs_notimpl_bs_c_8,
137 };
138
139 /* bus space functions */
140
141 int
sa11x0_bs_map(void * t,bus_addr_t bpa,bus_size_t size,int flags,bus_space_handle_t * bshp)142 sa11x0_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int flags,
143 bus_space_handle_t *bshp)
144 {
145 u_long startpa, endpa, pa;
146 vaddr_t va;
147 const struct pmap_devmap *pd;
148
149 if ((pd = pmap_devmap_find_pa(bpa, size)) != NULL) {
150 /* Device was statically mapped. */
151 *bshp = pd->pd_va + (bpa - pd->pd_pa);
152 return 0;
153 }
154
155 startpa = trunc_page(bpa);
156 endpa = round_page(bpa + size);
157
158 /* XXX use extent manager to check duplicate mapping */
159
160 va = uvm_km_alloc(kernel_map, endpa - startpa, 0,
161 UVM_KMF_VAONLY | UVM_KMF_NOWAIT);
162 if (!va)
163 return ENOMEM;
164
165 *bshp = (bus_space_handle_t)(va + (bpa - startpa));
166
167 const int pmapflags =
168 (flags & (BUS_SPACE_MAP_CACHEABLE|BUS_SPACE_MAP_PREFETCHABLE))
169 ? 0
170 : PMAP_NOCACHE;
171
172 for (pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) {
173 pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE, pmapflags);
174 }
175 pmap_update(pmap_kernel());
176
177 return 0;
178 }
179
180 int
sa11x0_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 cacheable,bus_addr_t * bpap,bus_space_handle_t * bshp)181 sa11x0_bs_alloc(void *t, bus_addr_t rstart, bus_addr_t rend, bus_size_t size,
182 bus_size_t alignment, bus_size_t boundary, int cacheable,
183 bus_addr_t *bpap, bus_space_handle_t *bshp)
184 {
185
186 panic("sa11x0_bs_alloc(): Help!");
187 }
188
189 void
sa11x0_bs_unmap(void * t,bus_space_handle_t bsh,bus_size_t size)190 sa11x0_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size)
191 {
192 vaddr_t va, endva;
193
194 if (pmap_devmap_find_va(bsh, size) != NULL) {
195 /* Device was statically mapped; nothing to do. */
196 return;
197 }
198
199 va = trunc_page(bsh);
200 endva = round_page(bsh + size);
201
202 pmap_kremove(va, endva - va);
203 pmap_update(pmap_kernel());
204
205 uvm_km_free(kernel_map, va, endva - va, UVM_KMF_VAONLY);
206 }
207
208 void
sa11x0_bs_free(void * t,bus_space_handle_t bsh,bus_size_t size)209 sa11x0_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size)
210 {
211
212 panic("sa11x0_bs_free(): Help!");
213 }
214
215 int
sa11x0_bs_subregion(void * t,bus_space_handle_t bsh,bus_size_t offset,bus_size_t size,bus_space_handle_t * nbshp)216 sa11x0_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset,
217 bus_size_t size, bus_space_handle_t *nbshp)
218 {
219
220 *nbshp = bsh + offset;
221 return 0;
222 }
223
224 paddr_t
sa11x0_bs_mmap(void * t,bus_addr_t paddr,off_t offset,int prot,int flags)225 sa11x0_bs_mmap(void *t, bus_addr_t paddr, off_t offset, int prot, int flags)
226 {
227 /*
228 * mmap from address `paddr+offset' for one page
229 */
230 return arm_btop((paddr + offset));
231 }
232
233 void *
sa11x0_bs_vaddr(void * t,bus_space_handle_t bsh)234 sa11x0_bs_vaddr(void *t, bus_space_handle_t bsh)
235 {
236 return (void *)bsh;
237 }
238
239 void
sa11x0_bs_barrier(void * t,bus_space_handle_t bsh,bus_size_t offset,bus_size_t len,int flags)240 sa11x0_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset,
241 bus_size_t len, int flags)
242 {
243
244 }
245