1 /* $NetBSD: mainbus_io.c,v 1.24 2018/03/16 17:56:32 ryo Exp $ */
2
3 /*
4 * Copyright (c) 1997 Mark Brinicombe.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Mark Brinicombe.
18 * 4. The name of the company nor the name of the author may be used to
19 * endorse or promote products derived from this software without specific
20 * prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
26 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
27 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
28 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 /*
36 * bus_space I/O functions for mainbus
37 */
38
39 #include <sys/cdefs.h>
40 __KERNEL_RCSID(0, "$NetBSD: mainbus_io.c,v 1.24 2018/03/16 17:56:32 ryo Exp $");
41
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/queue.h>
45
46 #include <uvm/uvm.h>
47
48 #include <sys/bus.h>
49 #include <machine/pmap.h>
50
51 /* Proto types for all the bus_space structure functions */
52
53 bs_protos(mainbus);
54 bs_protos(bs_notimpl);
55
56 /* Declare the mainbus bus space tag */
57
58 struct bus_space mainbus_bs_tag = {
59 /* cookie */
60 .bs_cookie = NULL,
61
62 /* mapping/unmapping */
63 .bs_map = mainbus_bs_map,
64 .bs_unmap = mainbus_bs_unmap,
65 .bs_subregion = mainbus_bs_subregion,
66
67 /* allocation/deallocation */
68 .bs_alloc = mainbus_bs_alloc,
69 .bs_free = mainbus_bs_free,
70
71 /* get kernel virtual address */
72 .bs_vaddr = NULL, /* there is no linear mapping */
73
74 /* Mmap bus space for user */
75 .bs_mmap = mainbus_bs_mmap,
76
77 /* barrier */
78 .bs_barrier = mainbus_bs_barrier,
79
80 /* read (single) */
81 .bs_r_1 = mainbus_bs_r_1,
82 .bs_r_2 = mainbus_bs_r_2,
83 .bs_r_4 = mainbus_bs_r_4,
84 .bs_r_8 = bs_notimpl_bs_r_8,
85
86 /* read multiple */
87 .bs_rm_1 =bs_notimpl_bs_rm_1,
88 .bs_rm_2 = mainbus_bs_rm_2,
89 .bs_rm_4 = bs_notimpl_bs_rm_4,
90 .bs_rm_8 = bs_notimpl_bs_rm_8,
91
92 /* read region */
93 .bs_rr_1 = bs_notimpl_bs_rr_1,
94 .bs_rr_2 = bs_notimpl_bs_rr_2,
95 .bs_rr_4 = bs_notimpl_bs_rr_4,
96 .bs_rr_8 = bs_notimpl_bs_rr_8,
97
98 /* write (single) */
99 .bs_w_1 = mainbus_bs_w_1,
100 .bs_w_2 = mainbus_bs_w_2,
101 .bs_w_4 = mainbus_bs_w_4,
102 .bs_w_8 = bs_notimpl_bs_w_8,
103
104 /* write multiple */
105 .bs_wm_1 = mainbus_bs_wm_1,
106 .bs_wm_2 = mainbus_bs_wm_2,
107 .bs_wm_4 = bs_notimpl_bs_wm_4,
108 .bs_wm_8 = bs_notimpl_bs_wm_8,
109
110 /* write region */
111 .bs_wr_1 = bs_notimpl_bs_wr_1,
112 .bs_wr_2 = bs_notimpl_bs_wr_2,
113 .bs_wr_4 = bs_notimpl_bs_wr_4,
114 .bs_wr_8 = bs_notimpl_bs_wr_8,
115
116 .bs_sm_1 = bs_notimpl_bs_sm_1,
117 .bs_sm_2 = bs_notimpl_bs_sm_2,
118 .bs_sm_4 = bs_notimpl_bs_sm_4,
119 .bs_sm_8 = bs_notimpl_bs_sm_8,
120
121 /* set region */
122 .bs_sr_1 = bs_notimpl_bs_sr_1,
123 .bs_sr_2 = bs_notimpl_bs_sr_2,
124 .bs_sr_4 = bs_notimpl_bs_sr_4,
125 .bs_sr_8 = bs_notimpl_bs_sr_8,
126
127 /* copy */
128 .bs_c_1 = bs_notimpl_bs_c_1,
129 .bs_c_2 = bs_notimpl_bs_c_2,
130 .bs_c_4 = bs_notimpl_bs_c_4,
131 .bs_c_8 = bs_notimpl_bs_c_8,
132
133 #ifdef __BUS_SPACE_HAS_STREAM_METHODS
134 /* stream methods */
135 /* read (single) */
136 .bs_r_1_s = mainbus_bs_r_1,
137 .bs_r_2_s = mainbus_bs_r_2,
138 .bs_r_4_s = mainbus_bs_r_4,
139 .bs_r_8_s = bs_notimpl_bs_r_8,
140
141 /* read multiple */
142 .bs_rm_1_s = bs_notimpl_bs_rm_1,
143 .bs_rm_2_s = mainbus_bs_rm_2,
144 .bs_rm_4_s = bs_notimpl_bs_rm_4,
145 .bs_rm_8_s = bs_notimpl_bs_rm_8,
146
147 /* read region */
148 .bs_rr_1_s = bs_notimpl_bs_rr_1,
149 .bs_rr_2_s = bs_notimpl_bs_rr_2,
150 .bs_rr_4_s = bs_notimpl_bs_rr_4,
151 .bs_rr_8_s = bs_notimpl_bs_rr_8,
152
153 /* write (single) */
154 .bs_w_1_s = mainbus_bs_w_1,
155 .bs_w_2_s = mainbus_bs_w_2,
156 .bs_w_4_s = mainbus_bs_w_4,
157 .bs_w_8_s = bs_notimpl_bs_w_8,
158
159 /* write multiple */
160 .bs_wm_1_s = mainbus_bs_wm_1,
161 .bs_wm_2_s = mainbus_bs_wm_2,
162 .bs_wm_4_s = bs_notimpl_bs_wm_4,
163 .bs_wm_8_s = bs_notimpl_bs_wm_8,
164
165 /* write region */
166 .bs_wr_1_s = bs_notimpl_bs_wr_1,
167 .bs_wr_2_s = bs_notimpl_bs_wr_2,
168 .bs_wr_4_s = bs_notimpl_bs_wr_4,
169 .bs_wr_8_s = bs_notimpl_bs_wr_8,
170 #endif
171 };
172
173 /* bus space functions */
174
175 int
mainbus_bs_map(void * t,bus_addr_t bpa,bus_size_t size,int flags,bus_space_handle_t * bshp)176 mainbus_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int flags, bus_space_handle_t *bshp)
177 {
178 u_long startpa, endpa, pa;
179 vaddr_t va;
180
181 if ((u_long)bpa > (u_long)KERNEL_BASE) {
182 /* XXX This is a temporary hack to aid transition. */
183 *bshp = bpa;
184 return(0);
185 }
186
187 startpa = trunc_page(bpa);
188 endpa = round_page(bpa + size);
189
190 /* XXX use extent manager to check duplicate mapping */
191
192 va = uvm_km_alloc(kernel_map, endpa - startpa, 0,
193 UVM_KMF_VAONLY | UVM_KMF_NOWAIT);
194 if (! va)
195 return(ENOMEM);
196
197 *bshp = (bus_space_handle_t)(va + (bpa - startpa));
198
199 const int pmapflags =
200 (flags & (BUS_SPACE_MAP_CACHEABLE|BUS_SPACE_MAP_PREFETCHABLE))
201 ? 0
202 : PMAP_NOCACHE;
203 for (pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) {
204 pmap_kenter_pa(va, pa, VM_PROT_READ|VM_PROT_WRITE, pmapflags);
205 }
206 pmap_update(pmap_kernel());
207
208 return(0);
209 }
210
211 int
mainbus_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)212 mainbus_bs_alloc(void *t, bus_addr_t rstart, bus_addr_t rend,
213 bus_size_t size, bus_size_t alignment, bus_size_t boundary,
214 int cacheable,
215 bus_addr_t *bpap, bus_space_handle_t *bshp)
216 {
217 panic("mainbus_bs_alloc(): Help!");
218 }
219
220
221 void
mainbus_bs_unmap(void * t,bus_space_handle_t bsh,bus_size_t size)222 mainbus_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size)
223 {
224 /*
225 * Temporary implementation
226 */
227 }
228
229 void
mainbus_bs_free(void * t,bus_space_handle_t bsh,bus_size_t size)230 mainbus_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size)
231 {
232
233 panic("mainbus_bs_free(): Help!");
234 /* mainbus_bs_unmap() does all that we need to do. */
235 /* mainbus_bs_unmap(t, bsh, size);*/
236 }
237
238 int
mainbus_bs_subregion(void * t,bus_space_handle_t bsh,bus_size_t offset,bus_size_t size,bus_space_handle_t * nbshp)239 mainbus_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset, bus_size_t size, bus_space_handle_t *nbshp)
240 {
241
242 *nbshp = bsh + (offset << 2);
243 return (0);
244 }
245
246 paddr_t
mainbus_bs_mmap(void * t,bus_addr_t paddr,off_t offset,int prot,int flags)247 mainbus_bs_mmap(void *t, bus_addr_t paddr, off_t offset, int prot, int flags)
248 {
249 /*
250 * mmap from address `paddr+offset' for one page
251 */
252 return (arm_btop((paddr + offset)));
253 }
254
255 void
mainbus_bs_barrier(void * t,bus_space_handle_t bsh,bus_size_t offset,bus_size_t len,int flags)256 mainbus_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset, bus_size_t len, int flags)
257 {
258 }
259
260 /* End of mainbus_io.c */
261