NetBSD/sys/arch/mips/bonito/bonito_iobc.c

161 lines
4.6 KiB
C

/* $NetBSD: bonito_iobc.c,v 1.3 2005/12/11 12:18:07 christos Exp $ */
/*-
* Copyright (c) 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Code to manipulate the I/O Buffer Cache on the BONITO.
*
* The BONITO snoops uncached access to memory (e.g. via KSEG1); we only
* need to deal with the IOBC for DMA to cached memory.
*
* Note: This only applies to the 32-bit BONITO; BONITO64's IOBC
* is coherent.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: bonito_iobc.c,v 1.3 2005/12/11 12:18:07 christos Exp $");
#include <sys/param.h>
#include <machine/locore.h>
#include <machine/intr.h>
#include <mips/bonito/bonitoreg.h>
#include <mips/bonito/bonitovar.h>
#define CACHECMD_INVAL 0
#define CACHECMD_WBINV 1
#define CACHECMD_RDTAG 2
#define CACHECMD_WQFLUSH 3
#define IOBC_LINESIZE 32
#define IOBC_LINESHIFT 5
#define IOBC_NLINES 4
#define TAG_LOCK 0x80000000
#define TAG_WBACK 0x40000000
#define TAG_PFPEND 0x20000000
#define TAG_PEND 0x10000000
#define TAG_MOD 0x08000000
#define TAG_PFDVAL 0x04000000
#define TAG_DVAL 0x02000000
#define TAG_AVAL 0x01000000
#define TAG_ADDR 0x00ffffff
#define IOBC_LOCK(s) (s) = splhigh()
#define IOBC_UNLOCK(s) splx((s))
static void
bonito_iobc_cmd(uint32_t cmd, uint32_t line)
{
uint32_t ctrl;
ctrl = (cmd << BONITO_PCICACHECTRL_CACHECMD_SHIFT) |
(line << BONITO_PCICACHECTRL_CACHECMDLINE_SHIFT);
REGVAL(BONITO_PCICACHECTRL) = ctrl;
wbflush();
REGVAL(BONITO_PCICACHECTRL) = ctrl | BONITO_PCICACHECTRL_CMDEXEC;
wbflush();
while (REGVAL(BONITO_PCICACHECTRL) & BONITO_PCICACHECTRL_CMDEXEC)
/* spin */ ;
REGVAL(BONITO_PCICACHECTRL) = ctrl;
wbflush();
}
/*
* bonito_iobc_wbinv_range:
*
* Write-back and invalidate the specified range in
* the BONITO IOBC.
*/
void
bonito_iobc_wbinv_range(paddr_t pa, psize_t size)
{
uint32_t line, tag;
paddr_t tagaddr;
int s;
IOBC_LOCK(s);
for (line = 0; line < IOBC_NLINES; line++) {
bonito_iobc_cmd(CACHECMD_RDTAG, line);
tag = REGVAL(BONITO_PCICACHETAG);
if (tag & TAG_AVAL) {
tagaddr = (tag & TAG_ADDR) << IOBC_LINESHIFT;
if (tagaddr < (pa + size) &&
(tagaddr + IOBC_LINESIZE) > pa)
bonito_iobc_cmd(CACHECMD_WBINV, line);
}
}
bonito_iobc_cmd(CACHECMD_WQFLUSH, 0);
IOBC_UNLOCK(s);
}
/*
* bonito_iobc_inv_range:
*
* Invalidate the specified range in the BONITO IOBC.
*/
void
bonito_iobc_inv_range(paddr_t pa, psize_t size)
{
uint32_t line, tag;
paddr_t tagaddr;
int s;
IOBC_LOCK(s);
for (line = 0; line < IOBC_NLINES; line++) {
bonito_iobc_cmd(CACHECMD_RDTAG, line);
tag = REGVAL(BONITO_PCICACHETAG);
if (tag & TAG_AVAL) {
tagaddr = (tag & TAG_ADDR) << IOBC_LINESHIFT;
if (tagaddr < (pa + size) &&
(tagaddr + IOBC_LINESIZE) > pa)
bonito_iobc_cmd(CACHECMD_INVAL, line);
}
}
bonito_iobc_cmd(CACHECMD_WQFLUSH, 0);
IOBC_UNLOCK(s);
}