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      1 /*	$NetBSD: iommu.c,v 1.19 2023/12/20 05:18:00 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jeremy Cooper.
      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  * Set-up functions for the Sun3x DVMA I/O Mapper.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 __KERNEL_RCSID(0, "$NetBSD: iommu.c,v 1.19 2023/12/20 05:18:00 thorpej Exp $");
     38 
     39 #include <sys/param.h>
     40 #include <sys/systm.h>
     41 #include <sys/device.h>
     42 #include <sys/conf.h>
     43 #include <sys/buf.h>
     44 #include <sys/proc.h>
     45 
     46 #include <machine/autoconf.h>
     47 
     48 #include <sun3/sun3x/iommu.h>
     49 #include <sun3/sun3x/obio.h>
     50 
     51 #define IOMMU_SIZE	(IOMMU_NENT * sizeof(iommu_pde_t))
     52 
     53 static int  iommu_match(device_t, cfdata_t, void *);
     54 static void iommu_attach(device_t, device_t, void *);
     55 
     56 CFATTACH_DECL_NEW(iommu, 0,
     57     iommu_match, iommu_attach, NULL, NULL);
     58 
     59 static iommu_pde_t *iommu_va;
     60 
     61 static int
     62 iommu_match(device_t parent, cfdata_t cf, void *args)
     63 {
     64 	/* This driver only supports one instance. */
     65 	if (iommu_va)
     66 		return 0;
     67 
     68 	return 1;
     69 }
     70 
     71 static void
     72 iommu_attach(device_t parent, device_t self, void *args)
     73 {
     74 	struct confargs *ca = args;
     75 
     76 	iommu_va = (iommu_pde_t *)bus_mapin(ca->ca_bustype, ca->ca_paddr,
     77 	    IOMMU_SIZE);
     78 
     79 	aprint_normal("\n");
     80 }
     81 
     82 void
     83 iommu_enter(uint32_t sa, uint32_t pa)
     84 {
     85 	int pn;
     86 
     87 #ifdef	DIAGNOSTIC
     88 	if (sa > (1<<24))
     89 		panic("%s: bad sa", __func__);
     90 #endif
     91 
     92 	/* Convert the slave address into a page index. */
     93 	pn = IOMMU_BTOP(sa);
     94 
     95 	/* Mask the physical address to insure it is page aligned */
     96 	pa &= IOMMU_PDE_PA;
     97 	pa |= IOMMU_PDE_DT_VALID;
     98 
     99 	iommu_va[pn].addr.raw = pa;
    100 }
    101 
    102 void
    103 iommu_remove(uint32_t sa, uint32_t len)
    104 {
    105 	int pn;
    106 
    107 #ifdef	DIAGNOSTIC
    108 	if (sa > (1<<24))
    109 		panic("%s: bad sa", __func__);
    110 #endif
    111 
    112 	pn = IOMMU_BTOP(sa);
    113 	while (len > 0) {
    114 		iommu_va[pn++].addr.raw = IOMMU_PDE_DT_INVALID;
    115 		len -= IOMMU_PAGE_SIZE;
    116 	}
    117 }
    118