obio_space.c revision 1.4 
1/*	$NetBSD: obio_space.c,v 1.4 2003/01/02 23:04:08 briggs Exp $	*/
2
3/*
4 * Copyright (c) 2001, 2002 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/param.h>
43#include <sys/systm.h>
44
45#include <uvm/uvm_extern.h>
46
47#include <machine/bus.h>
48
49#include "iq80321reg.h"
50
51/* Prototypes for all the bus_space structure functions */
52bs_protos(obio);
53bs_protos(generic);
54bs_protos(generic_armv4);
55bs_protos(bs_notimpl);
56
57/*
58 * The obio bus space tag.  This is constant for all instances, so
59 * we never have to explicitly "create" it.
60 */
61struct bus_space obio_bs_tag = {
62	/* cookie */
63	(void *) 0,
64
65	/* mapping/unmapping */
66	obio_bs_map,
67	obio_bs_unmap,
68	obio_bs_subregion,
69
70	/* allocation/deallocation */
71	obio_bs_alloc,
72	obio_bs_free,
73
74	/* get kernel virtual address */
75	obio_bs_vaddr,
76
77	/* mmap */
78	bs_notimpl_bs_mmap,
79
80	/* barrier */
81	obio_bs_barrier,
82
83	/* read (single) */
84	generic_bs_r_1,
85	generic_armv4_bs_r_2,
86	generic_bs_r_4,
87	bs_notimpl_bs_r_8,
88
89	/* read multiple */
90	generic_bs_rm_1,
91	bs_notimpl_bs_rm_2,
92	bs_notimpl_bs_rm_4,
93	bs_notimpl_bs_rm_8,
94
95	/* read region */
96	generic_bs_rr_1,
97	bs_notimpl_bs_rr_2,
98	bs_notimpl_bs_rr_4,
99	bs_notimpl_bs_rr_8,
100
101	/* write (single) */
102	generic_bs_w_1,
103	generic_armv4_bs_w_2,
104	generic_bs_w_4,
105	bs_notimpl_bs_w_8,
106
107	/* write multiple */
108	generic_bs_wm_1,
109	bs_notimpl_bs_wm_2,
110	bs_notimpl_bs_wm_4,
111	bs_notimpl_bs_wm_8,
112
113	/* write region */
114	bs_notimpl_bs_wr_1,
115	bs_notimpl_bs_wr_2,
116	bs_notimpl_bs_wr_4,
117	bs_notimpl_bs_wr_8,
118
119	/* set multiple */
120	bs_notimpl_bs_sm_1,
121	bs_notimpl_bs_sm_2,
122	bs_notimpl_bs_sm_4,
123	bs_notimpl_bs_sm_8,
124
125	/* set region */
126	bs_notimpl_bs_sr_1,
127	bs_notimpl_bs_sr_2,
128	bs_notimpl_bs_sr_4,
129	bs_notimpl_bs_sr_8,
130
131	/* copy */
132	bs_notimpl_bs_c_1,
133	bs_notimpl_bs_c_2,
134	bs_notimpl_bs_c_4,
135	bs_notimpl_bs_c_8,
136};
137
138int
139obio_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int flags,
140    bus_space_handle_t *bshp)
141{
142	uint32_t startpa, endpa, pa;
143	vaddr_t va;
144	pt_entry_t *pte;
145
146	if (bpa > IQ80321_IOPXS_VBASE) {
147		/*
148		 * IQ80321 on-board devices are mapped VA==PA.  All
149		 * addresses we're provided, therefore, don't need
150		 * any additional mapping.
151		 */
152		*bshp = bpa;
153	} else {
154		/*
155		 * Some devices, however, may lie outside the
156		 * already-mapped space (notably flash).
157		 */
158		startpa = trunc_page(bpa);
159		endpa = round_page(bpa + size);
160
161		/* XXX use some extent to check for duplicate mappings? */
162
163		va = uvm_km_valloc(kernel_map, endpa - startpa);
164		if (! va)
165			return ENOMEM;
166
167		*bshp = (bus_space_handle_t) (va + (bpa - startpa));
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);
171			pte = vtopte(va);
172			*pte &= ~L2_S_CACHE_MASK;
173			PTE_SYNC(pte);
174		}
175		pmap_update(pmap_kernel());
176	}
177
178	return 0;
179}
180
181int
182obio_bs_alloc(void *t, bus_addr_t rstart, bus_addr_t rend, bus_size_t size,
183    bus_size_t alignment, bus_size_t boundary, int flags, bus_addr_t *bpap,
184    bus_space_handle_t *bshp)
185{
186
187	panic("obio_bs_alloc(): not implemented");
188}
189
190
191void
192obio_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size)
193{
194
195	/* Nothing to do. */
196	/* XXX -- technically, if we alloc and map above, we should
197	 * unmap and free here, but we bail on this for now.
198	 */
199}
200
201void
202obio_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size)
203{
204
205	panic("obio_bs_free(): not implemented");
206}
207
208int
209obio_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset,
210    bus_size_t size, bus_space_handle_t *nbshp)
211{
212
213	*nbshp = bsh + offset;
214	return (0);
215}
216
217void *
218obio_bs_vaddr(void *t, bus_space_handle_t bsh)
219{
220
221	return ((void *)bsh);
222}
223
224void
225obio_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset,
226    bus_size_t len, int flags)
227{
228
229	/* Nothing to do. */
230}
231