1/*	$NetBSD: obio_space.c,v 1.2 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 Tungsten on-board devices
40 */
41
42#include <sys/cdefs.h>
43__KERNEL_RCSID(0, "$NetBSD: obio_space.c,v 1.2 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 */
53bs_protos(obio);
54bs_protos(generic);
55bs_protos(generic_armv4);
56bs_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 */
62struct 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 = bs_notimpl_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 = bs_notimpl_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
139int
140obio_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
177int
178obio_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
187void
188obio_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
204void
205obio_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size)
206{
207
208	panic("obio_bs_free(): not implemented");
209}
210
211int
212obio_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
220void *
221obio_bs_vaddr(void *t, bus_space_handle_t bsh)
222{
223
224	return ((void *)bsh);
225}
226
227void
228obio_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