1 /* $NetBSD: bonito_iobc.c,v 1.4 2008/04/28 20:23:28 martin 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 1.4 2008/04/28 20:23:28 martin Exp $"); 44 45 #include <sys/param.h> 46 47 #include <machine/locore.h> 48 #include <machine/intr.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 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 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 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