obio_space.c revision 1.6 
1/*	$NetBSD: obio_space.c,v 1.6 2002/04/12 19:02:31 thorpej 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(generic);
54bs_protos(bs_notimpl);
55
56/*
57 * The obio bus space tag.  This is constant for all instances, so
58 * we never have to explicitly "create" it.
59 */
60struct bus_space obio_bs_tag = {
61	/* cookie */
62	(void *) 0,
63
64	/* mapping/unmapping */
65	obio_bs_map,
66	obio_bs_unmap,
67	obio_bs_subregion,
68
69	/* allocation/deallocation */
70	obio_bs_alloc,
71	obio_bs_free,
72
73	/* get kernel virtual address */
74	obio_bs_vaddr,
75
76	/* mmap */
77	bs_notimpl_bs_mmap,
78
79	/* barrier */
80	obio_bs_barrier,
81
82	/* read (single) */
83	generic_bs_r_1,
84	bs_notimpl_bs_r_2,
85	generic_bs_r_4,
86	bs_notimpl_bs_r_8,
87
88	/* read multiple */
89	generic_bs_rm_1,
90	bs_notimpl_bs_rm_2,
91	bs_notimpl_bs_rm_4,
92	bs_notimpl_bs_rm_8,
93
94	/* read region */
95	generic_bs_rr_1,
96	bs_notimpl_bs_rr_2,
97	bs_notimpl_bs_rr_4,
98	bs_notimpl_bs_rr_8,
99
100	/* write (single) */
101	generic_bs_w_1,
102	bs_notimpl_bs_w_2,
103	generic_bs_w_4,
104	bs_notimpl_bs_w_8,
105
106	/* write multiple */
107	generic_bs_wm_1,
108	bs_notimpl_bs_wm_2,
109	bs_notimpl_bs_wm_4,
110	bs_notimpl_bs_wm_8,
111
112	/* write region */
113	bs_notimpl_bs_wr_1,
114	bs_notimpl_bs_wr_2,
115	bs_notimpl_bs_wr_4,
116	bs_notimpl_bs_wr_8,
117
118	/* set multiple */
119	bs_notimpl_bs_sm_1,
120	bs_notimpl_bs_sm_2,
121	bs_notimpl_bs_sm_4,
122	bs_notimpl_bs_sm_8,
123
124	/* set region */
125	bs_notimpl_bs_sr_1,
126	bs_notimpl_bs_sr_2,
127	bs_notimpl_bs_sr_4,
128	bs_notimpl_bs_sr_8,
129
130	/* copy */
131	bs_notimpl_bs_c_1,
132	bs_notimpl_bs_c_2,
133	bs_notimpl_bs_c_4,
134	bs_notimpl_bs_c_8,
135};
136
137int
138obio_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int flags,
139    bus_space_handle_t *bshp)
140{
141	u_long startpa, endpa, pa;
142	vaddr_t va;
143	pt_entry_t *pte;
144
145	if (bpa > IQ80310_OBIO_BASE) {
146
147		/*
148		 * IQ80310 on-board devices are mapped VA==PA.  All addresses
149		 * we're provided, therefore, don't need any additional mapping.
150		 */
151		*bshp = bpa;
152
153	} else {
154
155		/*
156		 * Some devices actually lie outside the range above.
157		 * Notably: flash.
158		 */
159		startpa = trunc_page(bpa);
160		endpa = round_page(bpa + size);
161
162		/* XXX use extent manager to check duplicate mapping */
163
164		va = uvm_km_valloc(kernel_map, endpa - startpa);
165		if (! va)
166			return(ENOMEM);
167
168		*bshp = (bus_space_handle_t)(va + (bpa - startpa));
169
170		for (pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) {
171			pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE);
172			pte = vtopte(va);
173			*pte &= ~L2_S_CACHE_MASK;
174		}
175		pmap_update(pmap_kernel());
176
177	}
178
179	return 0;
180}
181
182int
183obio_bs_alloc(void *t, bus_addr_t rstart, bus_addr_t rend, bus_size_t size,
184    bus_size_t alignment, bus_size_t boundary, int flags, bus_addr_t *bpap,
185    bus_space_handle_t *bshp)
186{
187
188	panic("obio_bs_alloc(): not implemented\n");
189}
190
191
192void
193obio_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size)
194{
195
196	/* Nothing to do. */
197	/* XXX -- technically, if we alloc and map above, we should
198	 * unmap and free here, but we bail on this for now.
199	 */
200}
201
202void
203obio_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size)
204{
205
206	panic("obio_bs_free(): not implemented\n");
207}
208
209int
210obio_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset,
211    bus_size_t size, bus_space_handle_t *nbshp)
212{
213
214	*nbshp = bsh + offset;
215	return (0);
216}
217
218void *
219obio_bs_vaddr(void *t, bus_space_handle_t bsh)
220{
221
222	return ((void *)bsh);
223}
224
225void
226obio_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset,
227    bus_size_t len, int flags)
228{
229
230	/* Nothing to do. */
231}
232