1 /* $NetBSD: ep93xx_space.c,v 1.7 2021/11/21 08:25:26 skrll Exp $ */
2
3 /*
4 * Copyright (c) 2004 Jesse Off
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 *
16 * THIS SOFTWARE IS PROVIDED BY ICHIRO FUKUHARA ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL ICHIRO FUKUHARA OR THE VOICES IN HIS HEAD BE LIABLE FOR
20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: ep93xx_space.c,v 1.7 2021/11/21 08:25:26 skrll Exp $");
31
32 /*
33 * bus_space I/O functions for ep93xx
34 */
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/queue.h>
39
40 #include <uvm/uvm.h>
41
42 #include <sys/bus.h>
43
44 #include <arm/ep93xx/ep93xxreg.h>
45 #include <arm/ep93xx/ep93xxvar.h>
46
47 /* Proto types for all the bus_space structure functions */
48 bs_protos(ep93xx);
49 bs_protos(generic);
50 bs_protos(generic_armv4);
51 bs_protos(bs_notimpl);
52
53 struct bus_space ep93xx_bs_tag = {
54 /* cookie */
55 .bs_cookie = (void *) 0,
56
57 /* mapping/unmapping */
58 .bs_map = ep93xx_bs_map,
59 .bs_unmap = ep93xx_bs_unmap,
60 .bs_subregion = ep93xx_bs_subregion,
61
62 /* allocation/deallocation */
63 .bs_alloc = ep93xx_bs_alloc,
64 .bs_free = ep93xx_bs_free,
65
66 /* get kernel virtual address */
67 .bs_vaddr = ep93xx_bs_vaddr,
68
69 /* mmap bus space for userland */
70 .bs_mmap = ep93xx_bs_mmap,
71
72 /* barrier */
73 .bs_barrier = ep93xx_bs_barrier,
74
75 /* read (single) */
76 .bs_r_1 = generic_bs_r_1,
77 .bs_r_2 = generic_armv4_bs_r_2,
78 .bs_r_4 = generic_bs_r_4,
79 .bs_r_8 = bs_notimpl_bs_r_8,
80
81 /* read multiple */
82 .bs_rm_1 = generic_bs_rm_1,
83 .bs_rm_2 = generic_armv4_bs_rm_2,
84 .bs_rm_4 = generic_bs_rm_4,
85 .bs_rm_8 = bs_notimpl_bs_rm_8,
86
87 /* read region */
88 .bs_rr_1 = generic_bs_rr_1,
89 .bs_rr_2 = generic_armv4_bs_rr_2,
90 .bs_rr_4 = generic_bs_rr_4,
91 .bs_rr_8 = bs_notimpl_bs_rr_8,
92
93 /* write (single) */
94 .bs_w_1 = generic_bs_w_1,
95 .bs_w_2 = generic_armv4_bs_w_2,
96 .bs_w_4 = generic_bs_w_4,
97 .bs_w_8 = bs_notimpl_bs_w_8,
98
99 /* write multiple */
100 .bs_wm_1 = generic_bs_wm_1,
101 .bs_wm_2 = generic_armv4_bs_wm_2,
102 .bs_wm_4 = generic_bs_wm_4,
103 .bs_wm_8 = bs_notimpl_bs_wm_8,
104
105 /* write region */
106 .bs_wr_1 = generic_bs_wr_1,
107 .bs_wr_2 = generic_armv4_bs_wr_2,
108 .bs_wr_4 = generic_bs_wr_4,
109 .bs_wr_8 = bs_notimpl_bs_wr_8,
110
111 /* set multiple */
112 .bs_sm_1 = bs_notimpl_bs_sm_1,
113 .bs_sm_2 = bs_notimpl_bs_sm_2,
114 .bs_sm_4 = bs_notimpl_bs_sm_4,
115 .bs_sm_8 = bs_notimpl_bs_sm_8,
116
117 /* set region */
118 .bs_sr_1 = bs_notimpl_bs_sr_1,
119 .bs_sr_2 = generic_armv4_bs_sr_2,
120 .bs_sr_4 = generic_bs_sr_4,
121 .bs_sr_8 = bs_notimpl_bs_sr_8,
122
123 /* copy */
124 .bs_c_1 = bs_notimpl_bs_c_1,
125 .bs_c_2 = generic_armv4_bs_c_2,
126 .bs_c_4 = bs_notimpl_bs_c_4,
127 .bs_c_8 = bs_notimpl_bs_c_8,
128 };
129
130 int
ep93xx_bs_map(void * t,bus_addr_t bpa,bus_size_t size,int cacheable,bus_space_handle_t * bshp)131 ep93xx_bs_map(void *t, bus_addr_t bpa, bus_size_t size,
132 int cacheable, bus_space_handle_t *bshp)
133 {
134 const struct pmap_devmap *pd;
135
136 paddr_t startpa;
137 paddr_t endpa;
138 paddr_t pa;
139 paddr_t offset;
140 vaddr_t va;
141
142 if ((pd = pmap_devmap_find_pa(bpa, size)) != NULL) {
143 /* Device was statically mapped. */
144 *bshp = pd->pd_va + (bpa - pd->pd_pa);
145 return 0;
146 }
147
148 endpa = round_page(bpa + size);
149 offset = bpa & PAGE_MASK;
150 startpa = trunc_page(bpa);
151
152 /* Get some VM. */
153 va = uvm_km_alloc(kernel_map, endpa - startpa, 0,
154 UVM_KMF_VAONLY | UVM_KMF_NOWAIT);
155 if (va == 0)
156 return ENOMEM;
157
158 /* Store the bus space handle */
159 *bshp = va + offset;
160
161 /* Now map the pages */
162 for (pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) {
163 pmap_enter(pmap_kernel(), va, pa,
164 VM_PROT_READ | VM_PROT_WRITE,
165 VM_PROT_READ | VM_PROT_WRITE | PMAP_WIRED);
166 }
167 pmap_update(pmap_kernel());
168
169 return(0);
170 }
171
172 void
ep93xx_bs_unmap(void * t,bus_space_handle_t bsh,bus_size_t size)173 ep93xx_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size)
174 {
175 vaddr_t va;
176 vaddr_t endva;
177
178 if (pmap_devmap_find_va(bsh, size) != NULL) {
179 /* Device was statically mapped; nothing to do. */
180 return;
181 }
182
183 endva = round_page(bsh + size);
184 va = trunc_page(bsh);
185
186 pmap_remove(pmap_kernel(), va, endva);
187 pmap_update(pmap_kernel());
188 uvm_km_free(kernel_map, va, endva - va, UVM_KMF_VAONLY);
189 }
190
191 int
ep93xx_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)192 ep93xx_bs_alloc(void *t, bus_addr_t rstart, bus_addr_t rend,
193 bus_size_t size, bus_size_t alignment, bus_size_t boundary, int cacheable,
194 bus_addr_t *bpap, bus_space_handle_t *bshp)
195 {
196 panic("ep93xx_bs_alloc(): not implemented\n");
197 }
198
199 void
ep93xx_bs_free(void * t,bus_space_handle_t bsh,bus_size_t size)200 ep93xx_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size)
201 {
202 panic("ep93xx_bs_free(): not implemented\n");
203 }
204
205 int
ep93xx_bs_subregion(void * t,bus_space_handle_t bsh,bus_size_t offset,bus_size_t size,bus_space_handle_t * nbshp)206 ep93xx_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset,
207 bus_size_t size, bus_space_handle_t *nbshp)
208 {
209 *nbshp = bsh + offset;
210 return (0);
211 }
212
213 void *
ep93xx_bs_vaddr(void * t,bus_space_handle_t bsh)214 ep93xx_bs_vaddr(void *t, bus_space_handle_t bsh)
215 {
216 return ((void *)bsh);
217 }
218
219 paddr_t
ep93xx_bs_mmap(void * t,bus_addr_t addr,off_t off,int prot,int flags)220 ep93xx_bs_mmap(void *t, bus_addr_t addr, off_t off, int prot, int flags)
221 {
222 /* Not supported. */
223 return (-1);
224 }
225
226 void
ep93xx_bs_barrier(void * t,bus_space_handle_t bsh,bus_size_t offset,bus_size_t len,int flags)227 ep93xx_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset,
228 bus_size_t len, int flags)
229 {
230 /* NULL */
231 }
232 /* End of ep93xx_space.c */
233