sys/arch/mips/bonito/bonito_iobc.c

   1 /*      $NetBSD: bonito_iobc.c,v 1.3 2005/12/11 12:18:07 christos 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 1.3 2005/12/11 12:18:07 christos 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 }