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      1 /*	$NetBSD: pic_iocc.c,v 1.6 2020/11/21 15:52:32 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2007 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Tim Rightnour
      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 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: pic_iocc.c,v 1.6 2020/11/21 15:52:32 thorpej Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/kmem.h>
     37 #include <sys/kernel.h>
     38 #include <sys/bus.h>
     39 
     40 #include <uvm/uvm_extern.h>
     41 
     42 #include <machine/pio.h>
     43 #include <machine/intr.h>
     44 #include <machine/iocc.h>
     45 
     46 #include <arch/powerpc/pic/picvar.h>
     47 
     48 struct pic_ops *setup_iocc(void);
     49 
     50 static void iocc_set_priority(int, int, int);
     51 static int iocc_get_irq(struct pic_ops *, int);
     52 static void iocc_enable_irq(struct pic_ops *, int, int);
     53 static void iocc_ack_irq(struct pic_ops *, int);
     54 static void iocc_disable_irq(struct pic_ops *, int);
     55 
     56 struct pic_ops *
     57 setup_iocc(void)
     58 {
     59 	struct pic_ops *pic;
     60 	int i;
     61 
     62 	pic = kmem_alloc(sizeof(struct pic_ops), KM_SLEEP);
     63 	pic->pic_numintrs = 16;
     64 	pic->pic_cookie = (void *)NULL;
     65 	pic->pic_enable_irq = iocc_enable_irq;
     66 	pic->pic_reenable_irq = iocc_enable_irq;
     67 	pic->pic_disable_irq = iocc_disable_irq;
     68 	pic->pic_get_irq = iocc_get_irq;
     69 	pic->pic_ack_irq = iocc_ack_irq;
     70 	pic->pic_establish_irq = dummy_pic_establish_intr;
     71 	pic->pic_finish_setup = NULL;
     72 	strcpy(pic->pic_name, "iocc");
     73 	pic_add(pic);
     74 
     75 	/* set all priorities as high */
     76 	for (i=0; i < pic->pic_numintrs; i++)
     77 		iocc_set_priority(0, 0, i);
     78 	return(pic);
     79 }
     80 
     81 /*
     82  * the IOCC IER is a bitmask of pending IRQs, where only 0-15 are valid
     83  */
     84 static int
     85 iocc_get_irq(struct pic_ops *pic, int mode)
     86 {
     87         int irq;
     88         uint32_t rv = 0;
     89 
     90         rv = in32rb(RS6000_BUS_SPACE_IO + IOCC_IRR);
     91         if (rv == 0)
     92                 return 255;
     93 
     94         irq = 31 - __builtin_clz(rv);
     95         if (irq >= 0 && irq < 16)
     96                 return irq;
     97         return 255;
     98 }
     99 
    100 /* enable an IRQ on the IOCC */
    101 static void
    102 iocc_enable_irq(struct pic_ops *pic, int irq, int type)
    103 {
    104         uint32_t mask;
    105 
    106         mask = in32rb(RS6000_BUS_SPACE_IO + IOCC_IEE);
    107         mask |= 1 << irq;
    108         out32rb(RS6000_BUS_SPACE_IO + IOCC_IEE, mask);
    109 }
    110 
    111 /* disable an IRQ on the IOCC */
    112 static void
    113 iocc_disable_irq(struct pic_ops *pic, int irq)
    114 {
    115         uint32_t mask;
    116 
    117         mask = in32rb(RS6000_BUS_SPACE_IO + IOCC_IEE);
    118         mask &= ~(1 << irq);
    119         out32rb(RS6000_BUS_SPACE_IO + IOCC_IEE, mask);
    120 }
    121 
    122 /* Issue an EOI to the IOCC */
    123 static void
    124 iocc_ack_irq(struct pic_ops *pic, int irq)
    125 {
    126         out32rb(RS6000_BUS_SPACE_IO + IOCC_EOI(irq), 0x1); /* val is ignored */
    127 }
    128 
    129 /* set interrupt priority and destination */
    130 static void
    131 iocc_set_priority(int cpu, int pri, int irq)
    132 {
    133         uint32_t x;
    134 
    135         x = pri;
    136         x |= cpu<<8;
    137         out32rb(RS6000_BUS_SPACE_IO + IOCC_XIVR(irq), x);
    138 }
    139