1 /* $NetBSD: bonito_iobc.c,v 1.5 2011/07/10 23:13:22 matt Exp $ */
2
3 /*-
4 * Copyright (c) 2002 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /*
33 * Code to manipulate the I/O Buffer Cache on the BONITO.
34 *
35 * The BONITO snoops uncached access to memory (e.g. via KSEG1); we only
36 * need to deal with the IOBC for DMA to cached memory.
37 *
38 * Note: This only applies to the 32-bit BONITO; BONITO64's IOBC
39 * is coherent.
40 */
41
42 #include <sys/cdefs.h>
43 __KERNEL_RCSID(0, "$NetBSD: bonito_iobc.c,v 1.5 2011/07/10 23:13:22 matt Exp $");
44
45 #include <sys/param.h>
46 #include <sys/intr.h>
47
48 #include <mips/locore.h>
49
50 #include <mips/bonito/bonitoreg.h>
51 #include <mips/bonito/bonitovar.h>
52
53 #define CACHECMD_INVAL 0
54 #define CACHECMD_WBINV 1
55 #define CACHECMD_RDTAG 2
56 #define CACHECMD_WQFLUSH 3
57
58 #define IOBC_LINESIZE 32
59 #define IOBC_LINESHIFT 5
60 #define IOBC_NLINES 4
61
62 #define TAG_LOCK 0x80000000
63 #define TAG_WBACK 0x40000000
64 #define TAG_PFPEND 0x20000000
65 #define TAG_PEND 0x10000000
66 #define TAG_MOD 0x08000000
67 #define TAG_PFDVAL 0x04000000
68 #define TAG_DVAL 0x02000000
69 #define TAG_AVAL 0x01000000
70 #define TAG_ADDR 0x00ffffff
71
72 #define IOBC_LOCK(s) (s) = splhigh()
73 #define IOBC_UNLOCK(s) splx((s))
74
75 static void
bonito_iobc_cmd(uint32_t cmd,uint32_t line)76 bonito_iobc_cmd(uint32_t cmd, uint32_t line)
77 {
78 uint32_t ctrl;
79
80 ctrl = (cmd << BONITO_PCICACHECTRL_CACHECMD_SHIFT) |
81 (line << BONITO_PCICACHECTRL_CACHECMDLINE_SHIFT);
82
83 REGVAL(BONITO_PCICACHECTRL) = ctrl;
84 wbflush();
85
86 REGVAL(BONITO_PCICACHECTRL) = ctrl | BONITO_PCICACHECTRL_CMDEXEC;
87 wbflush();
88
89 while (REGVAL(BONITO_PCICACHECTRL) & BONITO_PCICACHECTRL_CMDEXEC)
90 /* spin */ ;
91
92 REGVAL(BONITO_PCICACHECTRL) = ctrl;
93 wbflush();
94 }
95
96 /*
97 * bonito_iobc_wbinv_range:
98 *
99 * Write-back and invalidate the specified range in
100 * the BONITO IOBC.
101 */
102 void
bonito_iobc_wbinv_range(paddr_t pa,psize_t size)103 bonito_iobc_wbinv_range(paddr_t pa, psize_t size)
104 {
105 uint32_t line, tag;
106 paddr_t tagaddr;
107 int s;
108
109 IOBC_LOCK(s);
110
111 for (line = 0; line < IOBC_NLINES; line++) {
112 bonito_iobc_cmd(CACHECMD_RDTAG, line);
113 tag = REGVAL(BONITO_PCICACHETAG);
114 if (tag & TAG_AVAL) {
115 tagaddr = (tag & TAG_ADDR) << IOBC_LINESHIFT;
116 if (tagaddr < (pa + size) &&
117 (tagaddr + IOBC_LINESIZE) > pa)
118 bonito_iobc_cmd(CACHECMD_WBINV, line);
119 }
120 }
121 bonito_iobc_cmd(CACHECMD_WQFLUSH, 0);
122
123 IOBC_UNLOCK(s);
124 }
125
126 /*
127 * bonito_iobc_inv_range:
128 *
129 * Invalidate the specified range in the BONITO IOBC.
130 */
131 void
bonito_iobc_inv_range(paddr_t pa,psize_t size)132 bonito_iobc_inv_range(paddr_t pa, psize_t size)
133 {
134 uint32_t line, tag;
135 paddr_t tagaddr;
136 int s;
137
138 IOBC_LOCK(s);
139
140 for (line = 0; line < IOBC_NLINES; line++) {
141 bonito_iobc_cmd(CACHECMD_RDTAG, line);
142 tag = REGVAL(BONITO_PCICACHETAG);
143 if (tag & TAG_AVAL) {
144 tagaddr = (tag & TAG_ADDR) << IOBC_LINESHIFT;
145 if (tagaddr < (pa + size) &&
146 (tagaddr + IOBC_LINESIZE) > pa)
147 bonito_iobc_cmd(CACHECMD_INVAL, line);
148 }
149 }
150 bonito_iobc_cmd(CACHECMD_WQFLUSH, 0);
151
152 IOBC_UNLOCK(s);
153 }
154