Home | History | Annotate | Line # | Download | only in bonito
bonito_iobc.c revision 1.1.20.3
      1  1.1.20.3    skrll /*	$NetBSD: bonito_iobc.c,v 1.1.20.3 2004/09/21 13:18:38 skrll Exp $	*/
      2       1.1  thorpej 
      3       1.1  thorpej /*-
      4       1.1  thorpej  * Copyright (c) 2002 The NetBSD Foundation, Inc.
      5       1.1  thorpej  * All rights reserved.
      6       1.1  thorpej  *
      7       1.1  thorpej  * This code is derived from software contributed to The NetBSD Foundation
      8       1.1  thorpej  * by Jason R. Thorpe.
      9       1.1  thorpej  *
     10       1.1  thorpej  * Redistribution and use in source and binary forms, with or without
     11       1.1  thorpej  * modification, are permitted provided that the following conditions
     12       1.1  thorpej  * are met:
     13       1.1  thorpej  * 1. Redistributions of source code must retain the above copyright
     14       1.1  thorpej  *    notice, this list of conditions and the following disclaimer.
     15       1.1  thorpej  * 2. Redistributions in binary form must reproduce the above copyright
     16       1.1  thorpej  *    notice, this list of conditions and the following disclaimer in the
     17       1.1  thorpej  *    documentation and/or other materials provided with the distribution.
     18       1.1  thorpej  * 3. All advertising materials mentioning features or use of this software
     19       1.1  thorpej  *    must display the following acknowledgement:
     20       1.1  thorpej  *	This product includes software developed by the NetBSD
     21       1.1  thorpej  *	Foundation, Inc. and its contributors.
     22       1.1  thorpej  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23       1.1  thorpej  *    contributors may be used to endorse or promote products derived
     24       1.1  thorpej  *    from this software without specific prior written permission.
     25       1.1  thorpej  *
     26       1.1  thorpej  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27       1.1  thorpej  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28       1.1  thorpej  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29       1.1  thorpej  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30       1.1  thorpej  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31       1.1  thorpej  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32       1.1  thorpej  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33       1.1  thorpej  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34       1.1  thorpej  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35       1.1  thorpej  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36       1.1  thorpej  * POSSIBILITY OF SUCH DAMAGE.
     37       1.1  thorpej  */
     38       1.1  thorpej 
     39       1.1  thorpej /*
     40       1.1  thorpej  * Code to manipulate the I/O Buffer Cache on the BONITO.
     41       1.1  thorpej  *
     42       1.1  thorpej  * The BONITO snoops uncached access to memory (e.g. via KSEG1); we only
     43       1.1  thorpej  * need to deal with the IOBC for DMA to cached memory.
     44       1.1  thorpej  *
     45       1.1  thorpej  * Note: This only applies to the 32-bit BONITO; BONITO64's IOBC
     46       1.1  thorpej  * is coherent.
     47       1.1  thorpej  */
     48       1.1  thorpej 
     49  1.1.20.1    skrll #include <sys/cdefs.h>
     50  1.1.20.3    skrll __KERNEL_RCSID(0, "$NetBSD: bonito_iobc.c,v 1.1.20.3 2004/09/21 13:18:38 skrll Exp $");
     51  1.1.20.1    skrll 
     52       1.1  thorpej #include <sys/param.h>
     53       1.1  thorpej 
     54       1.1  thorpej #include <machine/locore.h>
     55       1.1  thorpej #include <machine/intr.h>
     56       1.1  thorpej 
     57       1.1  thorpej #include <mips/bonito/bonitoreg.h>
     58       1.1  thorpej #include <mips/bonito/bonitovar.h>
     59       1.1  thorpej 
     60       1.1  thorpej #define	CACHECMD_INVAL		0
     61       1.1  thorpej #define	CACHECMD_WBINV		1
     62       1.1  thorpej #define	CACHECMD_RDTAG		2
     63       1.1  thorpej #define	CACHECMD_WQFLUSH	3
     64       1.1  thorpej 
     65       1.1  thorpej #define	IOBC_LINESIZE		32
     66       1.1  thorpej #define	IOBC_LINESHIFT		5
     67       1.1  thorpej #define	IOBC_NLINES		4
     68       1.1  thorpej 
     69       1.1  thorpej #define	TAG_LOCK		0x80000000
     70       1.1  thorpej #define	TAG_WBACK		0x40000000
     71       1.1  thorpej #define	TAG_PFPEND		0x20000000
     72       1.1  thorpej #define	TAG_PEND		0x10000000
     73       1.1  thorpej #define	TAG_MOD			0x08000000
     74       1.1  thorpej #define	TAG_PFDVAL		0x04000000
     75       1.1  thorpej #define	TAG_DVAL		0x02000000
     76       1.1  thorpej #define	TAG_AVAL		0x01000000
     77       1.1  thorpej #define	TAG_ADDR		0x00ffffff
     78       1.1  thorpej 
     79       1.1  thorpej #define	IOBC_LOCK(s)		(s) = splhigh()
     80       1.1  thorpej #define	IOBC_UNLOCK(s)		splx((s))
     81       1.1  thorpej 
     82       1.1  thorpej static void
     83       1.1  thorpej bonito_iobc_cmd(uint32_t cmd, uint32_t line)
     84       1.1  thorpej {
     85       1.1  thorpej 	uint32_t ctrl;
     86       1.1  thorpej 
     87       1.1  thorpej 	ctrl = (cmd << BONITO_PCICACHECTRL_CACHECMD_SHIFT) |
     88       1.1  thorpej 	       (line << BONITO_PCICACHECTRL_CACHECMDLINE_SHIFT);
     89       1.1  thorpej 
     90       1.1  thorpej 	REGVAL(BONITO_PCICACHECTRL) = ctrl;
     91       1.1  thorpej 	wbflush();
     92       1.1  thorpej 
     93       1.1  thorpej 	REGVAL(BONITO_PCICACHECTRL) = ctrl | BONITO_PCICACHECTRL_CMDEXEC;
     94       1.1  thorpej 	wbflush();
     95       1.1  thorpej 
     96       1.1  thorpej 	while (REGVAL(BONITO_PCICACHECTRL) & BONITO_PCICACHECTRL_CMDEXEC)
     97       1.1  thorpej 		/* spin */ ;
     98       1.1  thorpej 
     99       1.1  thorpej 	REGVAL(BONITO_PCICACHECTRL) = ctrl;
    100       1.1  thorpej 	wbflush();
    101       1.1  thorpej }
    102       1.1  thorpej 
    103       1.1  thorpej /*
    104       1.1  thorpej  * bonito_iobc_wbinv_range:
    105       1.1  thorpej  *
    106       1.1  thorpej  *	Write-back and invalidate the specified range in
    107       1.1  thorpej  *	the BONITO IOBC.
    108       1.1  thorpej  */
    109       1.1  thorpej void
    110       1.1  thorpej bonito_iobc_wbinv_range(paddr_t pa, psize_t size)
    111       1.1  thorpej {
    112       1.1  thorpej 	uint32_t line, tag;
    113       1.1  thorpej 	paddr_t tagaddr;
    114       1.1  thorpej 	int s;
    115       1.1  thorpej 
    116       1.1  thorpej 	IOBC_LOCK(s);
    117       1.1  thorpej 
    118       1.1  thorpej 	for (line = 0; line < IOBC_NLINES; line++) {
    119       1.1  thorpej 		bonito_iobc_cmd(CACHECMD_RDTAG, line);
    120       1.1  thorpej 		tag = REGVAL(BONITO_PCICACHETAG);
    121       1.1  thorpej 		if (tag & TAG_AVAL) {
    122       1.1  thorpej 			tagaddr = (tag & TAG_ADDR) << IOBC_LINESHIFT;
    123       1.1  thorpej 			if (tagaddr < (pa + size) &&
    124       1.1  thorpej 			    (tagaddr + IOBC_LINESIZE) > pa)
    125       1.1  thorpej 				bonito_iobc_cmd(CACHECMD_WBINV, line);
    126       1.1  thorpej 		}
    127       1.1  thorpej 	}
    128       1.1  thorpej 	bonito_iobc_cmd(CACHECMD_WQFLUSH, 0);
    129       1.1  thorpej 
    130       1.1  thorpej 	IOBC_UNLOCK(s);
    131       1.1  thorpej }
    132       1.1  thorpej 
    133       1.1  thorpej /*
    134       1.1  thorpej  * bonito_iobc_inv_range:
    135       1.1  thorpej  *
    136       1.1  thorpej  *	Invalidate the specified range in the BONITO IOBC.
    137       1.1  thorpej  */
    138       1.1  thorpej void
    139       1.1  thorpej bonito_iobc_inv_range(paddr_t pa, psize_t size)
    140       1.1  thorpej {
    141       1.1  thorpej 	uint32_t line, tag;
    142       1.1  thorpej 	paddr_t tagaddr;
    143       1.1  thorpej 	int s;
    144       1.1  thorpej 
    145       1.1  thorpej 	IOBC_LOCK(s);
    146       1.1  thorpej 
    147       1.1  thorpej 	for (line = 0; line < IOBC_NLINES; line++) {
    148       1.1  thorpej 		bonito_iobc_cmd(CACHECMD_RDTAG, line);
    149       1.1  thorpej 		tag = REGVAL(BONITO_PCICACHETAG);
    150       1.1  thorpej 		if (tag & TAG_AVAL) {
    151       1.1  thorpej 			tagaddr = (tag & TAG_ADDR) << IOBC_LINESHIFT;
    152       1.1  thorpej 			if (tagaddr < (pa + size) &&
    153       1.1  thorpej 			    (tagaddr + IOBC_LINESIZE) > pa)
    154       1.1  thorpej 				bonito_iobc_cmd(CACHECMD_INVAL, line);
    155       1.1  thorpej 		}
    156       1.1  thorpej 	}
    157       1.1  thorpej 	bonito_iobc_cmd(CACHECMD_WQFLUSH, 0);
    158       1.1  thorpej 
    159       1.1  thorpej 	IOBC_UNLOCK(s);
    160       1.1  thorpej }
    161