1 /* $NetBSD: bonito_iobc.c,v 1.1 2002/01/09 00:43:38 thorpej 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Code to manipulate the I/O Buffer Cache on the BONITO. 41 * 42 * The BONITO snoops uncached access to memory (e.g. via KSEG1); we only 43 * need to deal with the IOBC for DMA to cached memory. 44 * 45 * Note: This only applies to the 32-bit BONITO; BONITO64's IOBC 46 * is coherent. 47 */ 48 49 #include <sys/param.h> 50 51 #include <machine/locore.h> 52 #include <machine/intr.h> 53 54 #include <mips/bonito/bonitoreg.h> 55 #include <mips/bonito/bonitovar.h> 56 57 #define CACHECMD_INVAL 0 58 #define CACHECMD_WBINV 1 59 #define CACHECMD_RDTAG 2 60 #define CACHECMD_WQFLUSH 3 61 62 #define IOBC_LINESIZE 32 63 #define IOBC_LINESHIFT 5 64 #define IOBC_NLINES 4 65 66 #define TAG_LOCK 0x80000000 67 #define TAG_WBACK 0x40000000 68 #define TAG_PFPEND 0x20000000 69 #define TAG_PEND 0x10000000 70 #define TAG_MOD 0x08000000 71 #define TAG_PFDVAL 0x04000000 72 #define TAG_DVAL 0x02000000 73 #define TAG_AVAL 0x01000000 74 #define TAG_ADDR 0x00ffffff 75 76 #define IOBC_LOCK(s) (s) = splhigh() 77 #define IOBC_UNLOCK(s) splx((s)) 78 79 static void 80 bonito_iobc_cmd(uint32_t cmd, uint32_t line) 81 { 82 uint32_t ctrl; 83 84 ctrl = (cmd << BONITO_PCICACHECTRL_CACHECMD_SHIFT) | 85 (line << BONITO_PCICACHECTRL_CACHECMDLINE_SHIFT); 86 87 REGVAL(BONITO_PCICACHECTRL) = ctrl; 88 wbflush(); 89 90 REGVAL(BONITO_PCICACHECTRL) = ctrl | BONITO_PCICACHECTRL_CMDEXEC; 91 wbflush(); 92 93 while (REGVAL(BONITO_PCICACHECTRL) & BONITO_PCICACHECTRL_CMDEXEC) 94 /* spin */ ; 95 96 REGVAL(BONITO_PCICACHECTRL) = ctrl; 97 wbflush(); 98 } 99 100 /* 101 * bonito_iobc_wbinv_range: 102 * 103 * Write-back and invalidate the specified range in 104 * the BONITO IOBC. 105 */ 106 void 107 bonito_iobc_wbinv_range(paddr_t pa, psize_t size) 108 { 109 uint32_t line, tag; 110 paddr_t tagaddr; 111 int s; 112 113 IOBC_LOCK(s); 114 115 for (line = 0; line < IOBC_NLINES; line++) { 116 bonito_iobc_cmd(CACHECMD_RDTAG, line); 117 tag = REGVAL(BONITO_PCICACHETAG); 118 if (tag & TAG_AVAL) { 119 tagaddr = (tag & TAG_ADDR) << IOBC_LINESHIFT; 120 if (tagaddr < (pa + size) && 121 (tagaddr + IOBC_LINESIZE) > pa) 122 bonito_iobc_cmd(CACHECMD_WBINV, line); 123 } 124 } 125 bonito_iobc_cmd(CACHECMD_WQFLUSH, 0); 126 127 IOBC_UNLOCK(s); 128 } 129 130 /* 131 * bonito_iobc_inv_range: 132 * 133 * Invalidate the specified range in the BONITO IOBC. 134 */ 135 void 136 bonito_iobc_inv_range(paddr_t pa, psize_t size) 137 { 138 uint32_t line, tag; 139 paddr_t tagaddr; 140 int s; 141 142 IOBC_LOCK(s); 143 144 for (line = 0; line < IOBC_NLINES; line++) { 145 bonito_iobc_cmd(CACHECMD_RDTAG, line); 146 tag = REGVAL(BONITO_PCICACHETAG); 147 if (tag & TAG_AVAL) { 148 tagaddr = (tag & TAG_ADDR) << IOBC_LINESHIFT; 149 if (tagaddr < (pa + size) && 150 (tagaddr + IOBC_LINESIZE) > pa) 151 bonito_iobc_cmd(CACHECMD_INVAL, line); 152 } 153 } 154 bonito_iobc_cmd(CACHECMD_WQFLUSH, 0); 155 156 IOBC_UNLOCK(s); 157 } 158