ep93xx_space.c revision 1.3 
1/*	$NetBSD: ep93xx_space.c,v 1.3 2005/11/24 13:08:32 yamt Exp $ */
2
3/*
4 * Copyright (c) 2004 Jesse Off
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by Ichiro FUKUHARA.
18 * 4. The name of the company nor the name of the author may be used to
19 *    endorse or promote products derived from this software without specific
20 *    prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY ICHIRO FUKUHARA ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL ICHIRO FUKUHARA OR THE VOICES IN HIS HEAD BE LIABLE FOR
26 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36__KERNEL_RCSID(0, "$NetBSD: ep93xx_space.c,v 1.3 2005/11/24 13:08:32 yamt Exp $");
37
38/*
39 * bus_space I/O functions for ep93xx
40 */
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/queue.h>
45
46#include <uvm/uvm.h>
47
48#include <machine/bus.h>
49
50#include <arm/ep93xx/ep93xxreg.h>
51#include <arm/ep93xx/ep93xxvar.h>
52
53/* Proto types for all the bus_space structure functions */
54bs_protos(ep93xx);
55bs_protos(generic);
56bs_protos(generic_armv4);
57bs_protos(bs_notimpl);
58
59struct bus_space ep93xx_bs_tag = {
60	/* cookie */
61	(void *) 0,
62
63	/* mapping/unmapping */
64	ep93xx_bs_map,
65	ep93xx_bs_unmap,
66	ep93xx_bs_subregion,
67
68	/* allocation/deallocation */
69	ep93xx_bs_alloc,
70	ep93xx_bs_free,
71
72	/* get kernel virtual address */
73	ep93xx_bs_vaddr,
74
75	/* mmap bus space for userland */
76	ep93xx_bs_mmap,
77
78	/* barrier */
79	ep93xx_bs_barrier,
80
81	/* read (single) */
82        generic_bs_r_1,
83        generic_armv4_bs_r_2,
84        generic_bs_r_4,
85        bs_notimpl_bs_r_8,
86
87        /* read multiple */
88        generic_bs_rm_1,
89        generic_armv4_bs_rm_2,
90        generic_bs_rm_4,
91        bs_notimpl_bs_rm_8,
92
93        /* read region */
94        generic_bs_rr_1,
95        generic_armv4_bs_rr_2,
96        generic_bs_rr_4,
97        bs_notimpl_bs_rr_8,
98
99        /* write (single) */
100        generic_bs_w_1,
101        generic_armv4_bs_w_2,
102        generic_bs_w_4,
103        bs_notimpl_bs_w_8,
104
105        /* write multiple */
106        generic_bs_wm_1,
107        generic_armv4_bs_wm_2,
108        generic_bs_wm_4,
109        bs_notimpl_bs_wm_8,
110
111        /* write region */
112        generic_bs_wr_1,
113        generic_armv4_bs_wr_2,
114        generic_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        generic_armv4_bs_sr_2,
126        generic_bs_sr_4,
127        bs_notimpl_bs_sr_8,
128
129        /* copy */
130        bs_notimpl_bs_c_1,
131        generic_armv4_bs_c_2,
132        bs_notimpl_bs_c_4,
133        bs_notimpl_bs_c_8,
134};
135
136int
137ep93xx_bs_map(void *t, bus_addr_t bpa, bus_size_t size,
138	      int cacheable, bus_space_handle_t *bshp)
139{
140	const struct pmap_devmap	*pd;
141
142	paddr_t		startpa;
143        paddr_t		endpa;
144        paddr_t		pa;
145        paddr_t		offset;
146        vaddr_t		va;
147
148	if ((pd = pmap_devmap_find_pa(bpa, size)) != NULL) {
149		/* Device was statically mapped. */
150		*bshp = pd->pd_va + (bpa - pd->pd_pa);
151		return 0;
152	}
153
154	endpa = round_page(bpa + size);
155	offset = bpa & PAGE_MASK;
156	startpa = trunc_page(bpa);
157
158	/* Get some VM.  */
159	va = uvm_km_alloc(kernel_map, endpa - startpa, 0,
160	    UVM_KMF_VAONLY | UVM_KMF_NOWAIT);
161	if (va == 0)
162		return ENOMEM;
163
164	/* Store the bus space handle */
165	*bshp = va + offset;
166
167	/* Now map the pages */
168	for (pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) {
169		pmap_enter(pmap_kernel(), va, pa,
170		    VM_PROT_READ | VM_PROT_WRITE,
171		    VM_PROT_READ | VM_PROT_WRITE | PMAP_WIRED);
172	}
173	pmap_update(pmap_kernel());
174
175	return(0);
176}
177
178void
179ep93xx_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size)
180{
181	vaddr_t	va;
182	vaddr_t	endva;
183
184	if (pmap_devmap_find_va(bsh, size) != NULL) {
185		/* Device was statically mapped; nothing to do. */
186		return;
187	}
188
189	endva = round_page(bsh + size);
190	va = trunc_page(bsh);
191
192	pmap_remove(pmap_kernel(), va, endva);
193	pmap_update(pmap_kernel());
194	uvm_km_free(kernel_map, va, endva - va, UVM_KMF_VAONLY);
195}
196
197int
198ep93xx_bs_alloc(void *t, bus_addr_t rstart, bus_addr_t rend,
199	bus_size_t size, bus_size_t alignment, bus_size_t boundary, int cacheable,
200	bus_addr_t *bpap, bus_space_handle_t *bshp)
201{
202	panic("ep93xx_bs_alloc(): not implemented\n");
203}
204
205void
206ep93xx_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size)
207{
208	panic("ep93xx_bs_free(): not implemented\n");
209}
210
211int
212ep93xx_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset,
213	bus_size_t size, bus_space_handle_t *nbshp)
214{
215	*nbshp = bsh + offset;
216	return (0);
217}
218
219void *
220ep93xx_bs_vaddr(void *t, bus_space_handle_t bsh)
221{
222	return ((void *)bsh);
223}
224
225paddr_t
226ep93xx_bs_mmap(void *t, bus_addr_t addr, off_t off, int prot, int flags)
227{
228	/* Not supported. */
229	return (-1);
230}
231
232void
233ep93xx_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset,
234    bus_size_t len, int flags)
235{
236/* NULL */
237}
238/* End of ep93xx_space.c */
239