154 lines
4.2 KiB
C
154 lines
4.2 KiB
C
/* $NetBSD: bonito_iobc.c,v 1.5 2011/07/10 23:13:22 matt Exp $ */
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/*-
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* Copyright (c) 2002 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Code to manipulate the I/O Buffer Cache on the BONITO.
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*
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* The BONITO snoops uncached access to memory (e.g. via KSEG1); we only
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* need to deal with the IOBC for DMA to cached memory.
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*
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* Note: This only applies to the 32-bit BONITO; BONITO64's IOBC
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* is coherent.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: bonito_iobc.c,v 1.5 2011/07/10 23:13:22 matt Exp $");
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#include <sys/param.h>
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#include <sys/intr.h>
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#include <mips/locore.h>
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#include <mips/bonito/bonitoreg.h>
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#include <mips/bonito/bonitovar.h>
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#define CACHECMD_INVAL 0
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#define CACHECMD_WBINV 1
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#define CACHECMD_RDTAG 2
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#define CACHECMD_WQFLUSH 3
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#define IOBC_LINESIZE 32
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#define IOBC_LINESHIFT 5
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#define IOBC_NLINES 4
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#define TAG_LOCK 0x80000000
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#define TAG_WBACK 0x40000000
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#define TAG_PFPEND 0x20000000
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#define TAG_PEND 0x10000000
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#define TAG_MOD 0x08000000
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#define TAG_PFDVAL 0x04000000
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#define TAG_DVAL 0x02000000
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#define TAG_AVAL 0x01000000
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#define TAG_ADDR 0x00ffffff
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#define IOBC_LOCK(s) (s) = splhigh()
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#define IOBC_UNLOCK(s) splx((s))
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static void
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bonito_iobc_cmd(uint32_t cmd, uint32_t line)
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{
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uint32_t ctrl;
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ctrl = (cmd << BONITO_PCICACHECTRL_CACHECMD_SHIFT) |
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(line << BONITO_PCICACHECTRL_CACHECMDLINE_SHIFT);
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REGVAL(BONITO_PCICACHECTRL) = ctrl;
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wbflush();
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REGVAL(BONITO_PCICACHECTRL) = ctrl | BONITO_PCICACHECTRL_CMDEXEC;
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wbflush();
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while (REGVAL(BONITO_PCICACHECTRL) & BONITO_PCICACHECTRL_CMDEXEC)
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/* spin */ ;
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REGVAL(BONITO_PCICACHECTRL) = ctrl;
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wbflush();
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}
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/*
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* bonito_iobc_wbinv_range:
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*
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* Write-back and invalidate the specified range in
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* the BONITO IOBC.
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*/
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void
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bonito_iobc_wbinv_range(paddr_t pa, psize_t size)
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{
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uint32_t line, tag;
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paddr_t tagaddr;
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int s;
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IOBC_LOCK(s);
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for (line = 0; line < IOBC_NLINES; line++) {
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bonito_iobc_cmd(CACHECMD_RDTAG, line);
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tag = REGVAL(BONITO_PCICACHETAG);
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if (tag & TAG_AVAL) {
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tagaddr = (tag & TAG_ADDR) << IOBC_LINESHIFT;
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if (tagaddr < (pa + size) &&
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(tagaddr + IOBC_LINESIZE) > pa)
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bonito_iobc_cmd(CACHECMD_WBINV, line);
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}
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}
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bonito_iobc_cmd(CACHECMD_WQFLUSH, 0);
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IOBC_UNLOCK(s);
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}
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/*
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* bonito_iobc_inv_range:
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*
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* Invalidate the specified range in the BONITO IOBC.
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*/
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void
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bonito_iobc_inv_range(paddr_t pa, psize_t size)
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{
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uint32_t line, tag;
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paddr_t tagaddr;
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int s;
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IOBC_LOCK(s);
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for (line = 0; line < IOBC_NLINES; line++) {
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bonito_iobc_cmd(CACHECMD_RDTAG, line);
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tag = REGVAL(BONITO_PCICACHETAG);
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if (tag & TAG_AVAL) {
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tagaddr = (tag & TAG_ADDR) << IOBC_LINESHIFT;
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if (tagaddr < (pa + size) &&
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(tagaddr + IOBC_LINESIZE) > pa)
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bonito_iobc_cmd(CACHECMD_INVAL, line);
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}
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}
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bonito_iobc_cmd(CACHECMD_WQFLUSH, 0);
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IOBC_UNLOCK(s);
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}
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