obio_space.c revision 1.11 
1/*	$NetBSD: obio_space.c,v 1.11 2011/07/01 20:41:16 dyoung 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 1.11 2011/07/01 20:41:16 dyoung 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	(void *) 0,
65
66	/* mapping/unmapping */
67	obio_bs_map,
68	obio_bs_unmap,
69	obio_bs_subregion,
70
71	/* allocation/deallocation */
72	obio_bs_alloc,
73	obio_bs_free,
74
75	/* get kernel virtual address */
76	obio_bs_vaddr,
77
78	/* mmap */
79	bs_notimpl_bs_mmap,
80
81	/* barrier */
82	obio_bs_barrier,
83
84	/* read (single) */
85	generic_bs_r_1,
86	generic_armv4_bs_r_2,
87	generic_bs_r_4,
88	bs_notimpl_bs_r_8,
89
90	/* read multiple */
91	generic_bs_rm_1,
92	generic_armv4_bs_rm_2,
93	bs_notimpl_bs_rm_4,
94	bs_notimpl_bs_rm_8,
95
96	/* read region */
97	generic_bs_rr_1,
98	bs_notimpl_bs_rr_2,
99	bs_notimpl_bs_rr_4,
100	bs_notimpl_bs_rr_8,
101
102	/* write (single) */
103	generic_bs_w_1,
104	generic_armv4_bs_w_2,
105	generic_bs_w_4,
106	bs_notimpl_bs_w_8,
107
108	/* write multiple */
109	generic_bs_wm_1,
110	generic_armv4_bs_wm_2,
111	bs_notimpl_bs_wm_4,
112	bs_notimpl_bs_wm_8,
113
114	/* write region */
115	bs_notimpl_bs_wr_1,
116	bs_notimpl_bs_wr_2,
117	bs_notimpl_bs_wr_4,
118	bs_notimpl_bs_wr_8,
119
120	/* set multiple */
121	bs_notimpl_bs_sm_1,
122	bs_notimpl_bs_sm_2,
123	bs_notimpl_bs_sm_4,
124	bs_notimpl_bs_sm_8,
125
126	/* set region */
127	bs_notimpl_bs_sr_1,
128	bs_notimpl_bs_sr_2,
129	bs_notimpl_bs_sr_4,
130	bs_notimpl_bs_sr_8,
131
132	/* copy */
133	bs_notimpl_bs_c_1,
134	bs_notimpl_bs_c_2,
135	bs_notimpl_bs_c_4,
136	bs_notimpl_bs_c_8,
137};
138
139int
140obio_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int flags,
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	pt_entry_t *pte;
147
148	if ((pd = pmap_devmap_find_pa(bpa, size)) != NULL) {
149		/* Device was statically mapped. */
150		*bshp = pd->pd_va + (bpa - pd->pd_pa);
151		return (0);
152	}
153
154	endpa = round_page(bpa + size);
155	offset = bpa & PAGE_MASK;
156	startpa = trunc_page(bpa);
157
158	va = uvm_km_alloc(kernel_map, endpa - startpa, 0,
159	    UVM_KMF_VAONLY | UVM_KMF_NOWAIT);
160	if (va == 0)
161		return (ENOMEM);
162
163	*bshp = va + offset;
164
165	for (pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) {
166		pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE, 0);
167		pte = vtopte(va);
168		*pte &= ~L2_S_CACHE_MASK;
169		PTE_SYNC(pte);
170	}
171	pmap_update(pmap_kernel());
172
173	return (0);
174}
175
176int
177obio_bs_alloc(void *t, bus_addr_t rstart, bus_addr_t rend, bus_size_t size,
178    bus_size_t alignment, bus_size_t boundary, int flags, bus_addr_t *bpap,
179    bus_space_handle_t *bshp)
180{
181
182	panic("obio_bs_alloc(): not implemented");
183}
184
185
186void
187obio_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size)
188{
189	vaddr_t va, endva;
190
191	if (pmap_devmap_find_va(bsh, size) != NULL) {
192		/* Device was statically mapped; nothing to do. */
193		return;
194	}
195
196	endva = round_page(bsh + size);
197	va = trunc_page(bsh);
198
199	pmap_kremove(va, endva - va);
200	uvm_km_free(kernel_map, va, endva - va, UVM_KMF_VAONLY);
201}
202
203void
204obio_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size)
205{
206
207	panic("obio_bs_free(): not implemented");
208}
209
210int
211obio_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset,
212    bus_size_t size, bus_space_handle_t *nbshp)
213{
214
215	*nbshp = bsh + offset;
216	return (0);
217}
218
219void *
220obio_bs_vaddr(void *t, bus_space_handle_t bsh)
221{
222
223	return ((void *)bsh);
224}
225
226void
227obio_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset,
228    bus_size_t len, int flags)
229{
230
231	/* Nothing to do. */
232}
233