sa11x0_io.c revision 1.19 
1/*	$NetBSD: sa11x0_io.c,v 1.19 2011/07/01 20:31:39 dyoung 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 1.19 2011/07/01 20:31:39 dyoung 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 <sys/bus.h>
53#include <machine/pmap.h>
54
55/* Prototypes 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(void *t, bus_addr_t bpa, bus_size_t size, int cacheable,
143    bus_space_handle_t *bshp)
144{
145	u_long startpa, endpa, pa;
146	vaddr_t va;
147	pt_entry_t *pte;
148	const struct pmap_devmap *pd;
149
150	if ((pd = pmap_devmap_find_pa(bpa, size)) != NULL) {
151                /* Device was statically mapped. */
152		*bshp = pd->pd_va + (bpa - pd->pd_pa);
153		return 0;
154	}
155
156	startpa = trunc_page(bpa);
157	endpa = round_page(bpa + size);
158
159	/* XXX use extent manager to check duplicate mapping */
160
161	va = uvm_km_alloc(kernel_map, endpa - startpa, 0,
162	    UVM_KMF_VAONLY | UVM_KMF_NOWAIT);
163	if (!va)
164		return ENOMEM;
165
166	*bshp = (bus_space_handle_t)(va + (bpa - startpa));
167
168	for (pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) {
169		pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE, 0);
170		pte = vtopte(va);
171		if (cacheable == 0) {
172			*pte &= ~L2_S_CACHE_MASK;
173			PTE_SYNC(pte);
174		}
175	}
176	pmap_update(pmap_kernel());
177
178	return 0;
179}
180
181int
182sa11x0_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 cacheable,
184    bus_addr_t *bpap, bus_space_handle_t *bshp)
185{
186
187	panic("sa11x0_bs_alloc(): Help!");
188}
189
190void
191sa11x0_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size)
192{
193	vaddr_t va, endva;
194
195	if (pmap_devmap_find_va(bsh, size) != NULL) {
196		/* Device was statically mapped; nothing to do. */
197		return;
198	}
199
200	va = trunc_page(bsh);
201	endva = round_page(bsh + size);
202
203	pmap_kremove(va, endva - va);
204	pmap_update(pmap_kernel());
205
206	uvm_km_free(kernel_map, va, endva - va, UVM_KMF_VAONLY);
207}
208
209void
210sa11x0_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size)
211{
212
213	panic("sa11x0_bs_free(): Help!");
214}
215
216int
217sa11x0_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset,
218    bus_size_t size, bus_space_handle_t *nbshp)
219{
220
221	*nbshp = bsh + offset;
222	return 0;
223}
224
225paddr_t
226sa11x0_bs_mmap(void *t, bus_addr_t paddr, off_t offset, int prot, int flags)
227{
228	/*
229	 * mmap from address `paddr+offset' for one page
230	 */
231	 return arm_btop((paddr + offset));
232}
233
234void *
235sa11x0_bs_vaddr(void *t, bus_space_handle_t bsh)
236{
237	return (void *)bsh;
238}
239
240void
241sa11x0_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset,
242    bus_size_t len, int flags)
243{
244
245}
246