sa11x0_io.c revision 1.12 
1/*	$NetBSD: sa11x0_io.c,v 1.12 2003/07/15 00:24:51 lukem Exp $	*/
2
3/*
4 * Copyright (c) 1997 Mark Brinicombe.
5 * Copyright (c) 1997 Causality Limited.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by Ichiro FUKUHARA.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 *    must display the following acknowledgement:
21 *	This product includes software developed by Mark Brinicombe.
22 * 4. The name of the company nor the name of the author may be used to
23 *    endorse or promote products derived from this software without specific
24 *    prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
28 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
30 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
31 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
32 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39/*
40 * bus_space I/O functions for sa11x0
41 */
42
43#include <sys/cdefs.h>
44__KERNEL_RCSID(0, "$NetBSD: sa11x0_io.c,v 1.12 2003/07/15 00:24:51 lukem Exp $");
45
46#include <sys/param.h>
47#include <sys/systm.h>
48#include <sys/queue.h>
49
50#include <uvm/uvm.h>
51
52#include <machine/bus.h>
53#include <machine/pmap.h>
54
55/* Proto types for all the bus_space structure functions */
56
57bs_protos(sa11x0);
58bs_protos(bs_notimpl);
59
60/* Declare the sa11x0 bus space tag */
61
62struct bus_space sa11x0_bs_tag = {
63	/* cookie */
64	NULL,
65
66	/* mapping/unmapping */
67	sa11x0_bs_map,
68	sa11x0_bs_unmap,
69	sa11x0_bs_subregion,
70
71	/* allocation/deallocation */
72	sa11x0_bs_alloc,
73	sa11x0_bs_free,
74
75	/* get kernel virtual address */
76	sa11x0_bs_vaddr,
77
78	/* mmap bus space for userland */
79	sa11x0_bs_mmap,
80
81	/* barrier */
82	sa11x0_bs_barrier,
83
84	/* read (single) */
85	sa11x0_bs_r_1,
86	sa11x0_bs_r_2,
87	sa11x0_bs_r_4,
88	bs_notimpl_bs_r_8,
89
90	/* read multiple */
91	sa11x0_bs_rm_1,
92	sa11x0_bs_rm_2,
93	sa11x0_bs_rm_4,
94	bs_notimpl_bs_rm_8,
95
96	/* read region */
97	bs_notimpl_bs_rr_1,
98	sa11x0_bs_rr_2,
99	bs_notimpl_bs_rr_4,
100	bs_notimpl_bs_rr_8,
101
102	/* write (single) */
103	sa11x0_bs_w_1,
104	sa11x0_bs_w_2,
105	sa11x0_bs_w_4,
106	bs_notimpl_bs_w_8,
107
108	/* write multiple */
109	sa11x0_bs_wm_1,
110	sa11x0_bs_wm_2,
111	sa11x0_bs_wm_4,
112	bs_notimpl_bs_wm_8,
113
114	/* write region */
115	bs_notimpl_bs_wr_1,
116	sa11x0_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	sa11x0_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	sa11x0_bs_c_2,
135	bs_notimpl_bs_c_4,
136	bs_notimpl_bs_c_8,
137};
138
139/* bus space functions */
140
141int
142sa11x0_bs_map(t, bpa, size, cacheable, bshp)
143	void *t;
144	bus_addr_t bpa;
145	bus_size_t size;
146	int cacheable;
147	bus_space_handle_t *bshp;
148{
149	u_long startpa, endpa, pa;
150	vaddr_t va;
151	pt_entry_t *pte;
152
153#ifdef hpcarm
154	if ((u_long)bpa > (u_long)KERNEL_BASE) {
155		/* XXX This is a temporary hack to aid transition. */
156		*bshp = bpa;
157		return(0);
158	}
159#endif
160
161	startpa = trunc_page(bpa);
162	endpa = round_page(bpa + size);
163
164	/* XXX use extent manager to check duplicate mapping */
165
166	va = uvm_km_valloc(kernel_map, endpa - startpa);
167	if (! va)
168		return(ENOMEM);
169
170	*bshp = (bus_space_handle_t)(va + (bpa - startpa));
171
172	for(pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) {
173		pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE);
174		pte = vtopte(va);
175		if (cacheable == 0) {
176			*pte &= ~L2_S_CACHE_MASK;
177			PTE_SYNC(pte);
178		}
179	}
180	pmap_update(pmap_kernel());
181
182	return(0);
183}
184
185int
186sa11x0_bs_alloc(t, rstart, rend, size, alignment, boundary, cacheable,
187    bpap, bshp)
188	void *t;
189	bus_addr_t rstart, rend;
190	bus_size_t size, alignment, boundary;
191	int cacheable;
192	bus_addr_t *bpap;
193	bus_space_handle_t *bshp;
194{
195	panic("sa11x0_alloc(): Help!");
196}
197
198
199void
200sa11x0_bs_unmap(t, bsh, size)
201	void *t;
202	bus_space_handle_t bsh;
203	bus_size_t size;
204{
205	/*
206	 * Temporary implementation
207	 */
208}
209
210void
211sa11x0_bs_free(t, bsh, size)
212	void *t;
213	bus_space_handle_t bsh;
214	bus_size_t size;
215{
216
217	panic("sa11x0_free(): Help!");
218	/* sa11x0_unmap() does all that we need to do. */
219/*	sa11x0_unmap(t, bsh, size);*/
220}
221
222int
223sa11x0_bs_subregion(t, bsh, offset, size, nbshp)
224	void *t;
225	bus_space_handle_t bsh;
226	bus_size_t offset, size;
227	bus_space_handle_t *nbshp;
228{
229
230	*nbshp = bsh + offset;
231	return (0);
232}
233
234paddr_t
235sa11x0_bs_mmap(t, paddr, offset, prot, flags)
236	void *t;
237	bus_addr_t paddr;
238	off_t offset;
239	int prot;
240	int flags;
241{
242	/*
243	 * mmap from address `paddr+offset' for one page
244	 */
245	 return (arm_btop((paddr + offset)));
246}
247
248void *
249sa11x0_bs_vaddr(t, bsh)
250	void *t;
251	bus_space_handle_t bsh;
252{
253	return ((void *)bsh);
254}
255
256void
257sa11x0_bs_barrier(t, bsh, offset, len, flags)
258	void *t;
259	bus_space_handle_t bsh;
260	bus_size_t offset, len;
261	int flags;
262{
263/* NULL */
264}
265
266/* End of sa11x0_io.c */
267