obio_space.c revision 1.2 
1/*	$NetBSD: obio_space.c,v 1.2 2002/03/19 01:36:13 briggs Exp $	*/
2
3/*
4 * Copyright (c) 2001 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 IQ80310 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 "iq80310reg.h"
50
51/* Prototypes for all the bus_space structure functions */
52bs_protos(obio);
53bs_protos(bs_notimpl);
54
55/*
56 * The obio bus space tag.  This is constant for all instances, so
57 * we never have to explicitly "create" it.
58 */
59struct bus_space obio_bs_tag = {
60	/* cookie */
61	(void *) 0,
62
63	/* mapping/unmapping */
64	obio_bs_map,
65	obio_bs_unmap,
66	obio_bs_subregion,
67
68	/* allocation/deallocation */
69	obio_bs_alloc,
70	obio_bs_free,
71
72	/* get kernel virtual address */
73	obio_bs_vaddr,
74
75	/* mmap */
76	bs_notimpl_bs_mmap,
77
78	/* barrier */
79	obio_bs_barrier,
80
81	/* read (single) */
82	obio_bs_r_1,
83	bs_notimpl_bs_r_2,
84	obio_bs_r_4,
85	bs_notimpl_bs_r_8,
86
87	/* read multiple */
88	obio_bs_rm_1,
89	bs_notimpl_bs_rm_2,
90	bs_notimpl_bs_rm_4,
91	bs_notimpl_bs_rm_8,
92
93	/* read region */
94	obio_bs_rr_1,
95	bs_notimpl_bs_rr_2,
96	bs_notimpl_bs_rr_4,
97	bs_notimpl_bs_rr_8,
98
99	/* write (single) */
100	obio_bs_w_1,
101	bs_notimpl_bs_w_2,
102	obio_bs_w_4,
103	bs_notimpl_bs_w_8,
104
105	/* write multiple */
106	obio_bs_wm_1,
107	bs_notimpl_bs_wm_2,
108	bs_notimpl_bs_wm_4,
109	bs_notimpl_bs_wm_8,
110
111	/* write region */
112	bs_notimpl_bs_wr_1,
113	bs_notimpl_bs_wr_2,
114	bs_notimpl_bs_wr_4,
115	bs_notimpl_bs_wr_8,
116
117	/* set multiple */
118	bs_notimpl_bs_sm_1,
119	bs_notimpl_bs_sm_2,
120	bs_notimpl_bs_sm_4,
121	bs_notimpl_bs_sm_8,
122
123	/* set region */
124	bs_notimpl_bs_sr_1,
125	bs_notimpl_bs_sr_2,
126	bs_notimpl_bs_sr_4,
127	bs_notimpl_bs_sr_8,
128
129	/* copy */
130	bs_notimpl_bs_c_1,
131	bs_notimpl_bs_c_2,
132	bs_notimpl_bs_c_4,
133	bs_notimpl_bs_c_8,
134};
135
136int
137obio_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int flags,
138    bus_space_handle_t *bshp)
139{
140	u_long startpa, endpa, pa;
141	vaddr_t va;
142	pt_entry_t *pte;
143
144	if (bpa > IQ80310_OBIO_BASE) {
145
146		/*
147		 * IQ80310 on-board devices are mapped VA==PA.  All addresses
148		 * we're provided, therefore, don't need any additional mapping.
149		 */
150		*bshp = bpa;
151
152	} else {
153
154		/*
155		 * Some devices actually lie outside the range above.
156		 * Notably: flash.
157		 */
158		startpa = trunc_page(bpa);
159		endpa = round_page(bpa + size);
160
161		/* XXX use extent manager to check duplicate mapping */
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 = pmap_pte(pmap_kernel(), va);
172			*pte &= ~PT_CACHEABLE;
173		}
174		pmap_update(pmap_kernel());
175
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\n");
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\n");
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