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ipi_openpic.c revision 1.3 
      1 /* $NetBSD: ipi_openpic.c,v 1.3 2008/04/08 02:33:03 garbled Exp $ */
      2 /*-
      3  * Copyright (c) 2007 The NetBSD Foundation, Inc.
      4  * All rights reserved.
      5  *
      6  * This code is derived from software contributed to The NetBSD Foundation
      7  * by Tim Rightnour
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *        This product includes software developed by the NetBSD
     20  *        Foundation, Inc. and its contributors.
     21  * 4. Neither the name of The NetBSD Foundation nor the names of its
     22  *    contributors may be used to endorse or promote products derived
     23  *    from this software without specific prior written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     26  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     35  * POSSIBILITY OF SUCH DAMAGE.
     36  */
     37 
     38 #include <sys/cdefs.h>
     39 __KERNEL_RCSID(0, "$NetBSD: ipi_openpic.c,v 1.3 2008/04/08 02:33:03 garbled Exp $");
     40 
     41 #include "opt_multiprocessor.h"
     42 #include <sys/param.h>
     43 #include <sys/malloc.h>
     44 #include <sys/kernel.h>
     45 
     46 #include <uvm/uvm_extern.h>
     47 
     48 #include <machine/pio.h>
     49 #include <powerpc/openpic.h>
     50 #include <powerpc/atomic.h>
     51 
     52 #include <arch/powerpc/pic/picvar.h>
     53 #include <arch/powerpc/pic/ipivar.h>
     54 
     55 #ifdef MULTIPROCESSOR
     56 
     57 extern struct ipi_ops ipiops;
     58 extern volatile u_long IPI[CPU_MAXNUM];
     59 static void openpic_send_ipi(int, u_long);
     60 static void openpic_establish_ipi(int, int, void *);
     61 
     62 void
     63 setup_openpic_ipi(void)
     64 {
     65 	uint32_t x;
     66 
     67 	ipiops.ppc_send_ipi = openpic_send_ipi;
     68 	ipiops.ppc_establish_ipi = openpic_establish_ipi;
     69 	ipiops.ppc_ipi_vector = IPI_VECTOR;
     70 
     71 	/* Some (broken) openpic's byteswap on read, but not write. */
     72 	openpic_write(OPENPIC_IPI_VECTOR(0), OPENPIC_IMASK);
     73 	x = openpic_read(OPENPIC_IPI_VECTOR(0));
     74 	if (x != OPENPIC_IMASK)
     75 		x = bswap32(openpic_read(OPENPIC_IPI_VECTOR(1)));
     76 	else
     77 		x = openpic_read(OPENPIC_IPI_VECTOR(1));
     78 	x &= ~(OPENPIC_IMASK | OPENPIC_PRIORITY_MASK | OPENPIC_VECTOR_MASK);
     79 	x |= (15 << OPENPIC_PRIORITY_SHIFT) | ipiops.ppc_ipi_vector;
     80 	openpic_write(OPENPIC_IPI_VECTOR(1), x);
     81 }
     82 
     83 static void
     84 openpic_send_ipi(int target, u_long mesg)
     85 {
     86 	int cpumask = 0, i;
     87 
     88 	switch(target) {
     89 		case IPI_T_ALL:
     90 			for (i = 0; i < ncpu; i++) {
     91 				cpumask |= 1 << i;
     92 				atomic_setbits_ulong(&IPI[i], mesg);
     93 			}
     94 			break;
     95 		case IPI_T_NOTME:
     96 			for (i = 0; i < ncpu; i++) {
     97 				if (i != curcpu()->ci_index)
     98 					cpumask |= 1 << i;
     99 				atomic_setbits_ulong(&IPI[i], mesg);
    100 			}
    101 			break;
    102 		default:
    103 			cpumask = 1 << target;
    104 			atomic_setbits_ulong(&IPI[target], mesg);
    105 	}
    106 	openpic_write(OPENPIC_IPI(curcpu()->ci_index, 1), cpumask);
    107 }
    108 
    109 static void
    110 openpic_establish_ipi(int type, int level, void *ih_args)
    111 {
    112 /*
    113  * XXX
    114  * for now we catch IPIs early in pic_handle_intr() so no need to do anything
    115  * here
    116  */
    117 #if 0
    118 	intr_establish(ipiops.ppc_ipi_vector, type, level, ppcipi_intr,
    119 	    ih_args);
    120 #endif
    121 }
    122 
    123 #endif /*MULTIPROCESSOR*/
    124