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      1 /*	$NetBSD: bonito_iobc.c,v 1.5 2011/07/10 23:13:22 matt 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 1.5 2011/07/10 23:13:22 matt Exp $");
     44 
     45 #include <sys/param.h>
     46 #include <sys/intr.h>
     47 
     48 #include <mips/locore.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