1/*	$NetBSD: sa11x0_io.c,v 1.22 2023/04/21 15:00:48 skrll 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 1.22 2023/04/21 15:00:48 skrll 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	.bs_cookie = NULL,
65
66	/* mapping/unmapping */
67	.bs_map = sa11x0_bs_map,
68	.bs_unmap = sa11x0_bs_unmap,
69	.bs_subregion = sa11x0_bs_subregion,
70
71	/* allocation/deallocation */
72	.bs_alloc = sa11x0_bs_alloc,
73	.bs_free = sa11x0_bs_free,
74
75	/* get kernel virtual address */
76	.bs_vaddr = sa11x0_bs_vaddr,
77
78	/* mmap bus space for userland */
79	.bs_mmap = sa11x0_bs_mmap,
80
81	/* barrier */
82	.bs_barrier = sa11x0_bs_barrier,
83
84	/* read (single) */
85	.bs_r_1 = sa11x0_bs_r_1,
86	.bs_r_2 = sa11x0_bs_r_2,
87	.bs_r_4 = sa11x0_bs_r_4,
88	.bs_r_8 = bs_notimpl_bs_r_8,
89
90	/* read multiple */
91	.bs_rm_1 = sa11x0_bs_rm_1,
92	.bs_rm_2 = sa11x0_bs_rm_2,
93	.bs_rm_4 = sa11x0_bs_rm_4,
94	.bs_rm_8 = bs_notimpl_bs_rm_8,
95
96	/* read region */
97	.bs_rr_1 = bs_notimpl_bs_rr_1,
98	.bs_rr_2 = sa11x0_bs_rr_2,
99	.bs_rr_4 = bs_notimpl_bs_rr_4,
100	.bs_rr_8 = bs_notimpl_bs_rr_8,
101
102	/* write (single) */
103	.bs_w_1 = sa11x0_bs_w_1,
104	.bs_w_2 = sa11x0_bs_w_2,
105	.bs_w_4 = sa11x0_bs_w_4,
106	.bs_w_8 = bs_notimpl_bs_w_8,
107
108	/* write multiple */
109	.bs_wm_1 = sa11x0_bs_wm_1,
110	.bs_wm_2 = sa11x0_bs_wm_2,
111	.bs_wm_4 = sa11x0_bs_wm_4,
112	.bs_wm_8 = bs_notimpl_bs_wm_8,
113
114	/* write region */
115	.bs_wr_1 = bs_notimpl_bs_wr_1,
116	.bs_wr_2 = sa11x0_bs_wr_2,
117	.bs_wr_4 = bs_notimpl_bs_wr_4,
118	.bs_wr_8 = bs_notimpl_bs_wr_8,
119
120	/* set multiple */
121	.bs_sm_1 = bs_notimpl_bs_sm_1,
122	.bs_sm_2 = bs_notimpl_bs_sm_2,
123	.bs_sm_4 = bs_notimpl_bs_sm_4,
124	.bs_sm_8 = bs_notimpl_bs_sm_8,
125
126	/* set region */
127	.bs_sr_1 = bs_notimpl_bs_sr_1,
128	.bs_sr_2 = sa11x0_bs_sr_2,
129	.bs_sr_4 = bs_notimpl_bs_sr_4,
130	.bs_sr_8 = bs_notimpl_bs_sr_8,
131
132	/* copy */
133	.bs_c_1 = bs_notimpl_bs_c_1,
134	.bs_c_2 = sa11x0_bs_c_2,
135	.bs_c_4 = bs_notimpl_bs_c_4,
136	.bs_c_8 = 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 flags,
143    bus_space_handle_t *bshp)
144{
145	u_long startpa, endpa, pa;
146	vaddr_t va;
147	const struct pmap_devmap *pd;
148
149	if ((pd = pmap_devmap_find_pa(bpa, size)) != NULL) {
150                /* Device was statically mapped. */
151		*bshp = pd->pd_va + (bpa - pd->pd_pa);
152		return 0;
153	}
154
155	startpa = trunc_page(bpa);
156	endpa = round_page(bpa + size);
157
158	/* XXX use extent manager to check duplicate mapping */
159
160	va = uvm_km_alloc(kernel_map, endpa - startpa, 0,
161	    UVM_KMF_VAONLY | UVM_KMF_NOWAIT);
162	if (!va)
163		return ENOMEM;
164
165	*bshp = (bus_space_handle_t)(va + (bpa - startpa));
166
167	const int pmapflags =
168	    (flags & (BUS_SPACE_MAP_CACHEABLE|BUS_SPACE_MAP_PREFETCHABLE))
169		? 0
170		: PMAP_NOCACHE;
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, pmapflags);
174	}
175	pmap_update(pmap_kernel());
176
177	return 0;
178}
179
180int
181sa11x0_bs_alloc(void *t, bus_addr_t rstart, bus_addr_t rend, bus_size_t size,
182    bus_size_t alignment, bus_size_t boundary, int cacheable,
183    bus_addr_t *bpap, bus_space_handle_t *bshp)
184{
185
186	panic("sa11x0_bs_alloc(): Help!");
187}
188
189void
190sa11x0_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size)
191{
192	vaddr_t va, endva;
193
194	if (pmap_devmap_find_va(bsh, size) != NULL) {
195		/* Device was statically mapped; nothing to do. */
196		return;
197	}
198
199	va = trunc_page(bsh);
200	endva = round_page(bsh + size);
201
202	pmap_kremove(va, endva - va);
203	pmap_update(pmap_kernel());
204
205	uvm_km_free(kernel_map, va, endva - va, UVM_KMF_VAONLY);
206}
207
208void
209sa11x0_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size)
210{
211
212	panic("sa11x0_bs_free(): Help!");
213}
214
215int
216sa11x0_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset,
217    bus_size_t size, bus_space_handle_t *nbshp)
218{
219
220	*nbshp = bsh + offset;
221	return 0;
222}
223
224paddr_t
225sa11x0_bs_mmap(void *t, bus_addr_t paddr, off_t offset, int prot, int flags)
226{
227	/*
228	 * mmap from address `paddr+offset' for one page
229	 */
230	 return arm_btop((paddr + offset));
231}
232
233void *
234sa11x0_bs_vaddr(void *t, bus_space_handle_t bsh)
235{
236	return (void *)bsh;
237}
238
239void
240sa11x0_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset,
241    bus_size_t len, int flags)
242{
243
244}
245