1/* $NetBSD: pic_prepivr.c,v 1.9 2017/06/01 02:45:07 chs 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_prepivr.c,v 1.9 2017/06/01 02:45:07 chs Exp $"); 34 35#include <sys/param.h> 36#include <sys/kmem.h> 37#include <sys/kernel.h> 38#include <sys/intr.h> 39 40#include <uvm/uvm_extern.h> 41 42#include <machine/pio.h> 43 44#include <powerpc/pic/picvar.h> 45 46#include <dev/isa/isareg.h> 47#include <dev/isa/isavar.h> 48 49static int prepivr_get_irq(struct pic_ops *, int); 50static int motivr_get_irq(struct pic_ops *, int); 51static void prepivr_establish_irq(struct pic_ops *, int, int, int); 52 53extern vaddr_t prep_intr_reg; /* PReP interrupt vector register */ 54extern uint32_t prep_intr_reg_off; /* IVR offset within the mapped page */ 55 56#define IO_ELCR1 0x4d0 57#define IO_ELCR2 0x4d1 58 59/* 60 * Prior to calling init_prepivr, the port is expected to have mapped the 61 * page containing the IVR with mapiodev to prep_intr_reg and set up the 62 * prep_intr_reg_off. 63 */ 64 65struct pic_ops * 66setup_prepivr(int ivrtype) 67{ 68 struct i8259_ops *prepivr; 69 struct pic_ops *pic; 70 uint32_t pivr; 71 72 prepivr = kmem_alloc(sizeof(*prepivr), KM_SLEEP); 73 pic = &prepivr->pic; 74 75 pivr = prep_intr_reg + prep_intr_reg_off; 76 pic->pic_numintrs = 16; 77 pic->pic_cookie = (void *)pivr; 78 pic->pic_enable_irq = i8259_enable_irq; 79 pic->pic_reenable_irq = i8259_enable_irq; 80 pic->pic_disable_irq = i8259_disable_irq; 81 if (ivrtype == PIC_IVR_MOT) 82 pic->pic_get_irq = motivr_get_irq; 83 else 84 pic->pic_get_irq = prepivr_get_irq; 85 pic->pic_ack_irq = i8259_ack_irq; 86 pic->pic_establish_irq = prepivr_establish_irq; 87 pic->pic_finish_setup = NULL; 88 strcpy(pic->pic_name, "prepivr"); 89 pic_add(pic); 90 prepivr->pending_events = 0; 91 prepivr->enable_mask = 0xffffffff; 92 prepivr->irqs = 0; 93 94 /* initialize the ELCR */ 95 isa_outb(IO_ELCR1, (0 >> 0) & 0xff); 96 isa_outb(IO_ELCR2, (0 >> 8) & 0xff); 97 i8259_initialize(); 98 99 return pic; 100} 101 102static void 103prepivr_establish_irq(struct pic_ops *pic, int irq, int type, int maxlevel) 104{ 105 u_int8_t elcr[2]; 106 int icu, bit; 107 108 icu = irq / 8; 109 bit = irq % 8; 110 elcr[0] = isa_inb(IO_ELCR1); 111 elcr[1] = isa_inb(IO_ELCR2); 112 113 if (type == IST_LEVEL) 114 elcr[icu] |= 1 << bit; 115 else 116 elcr[icu] &= ~(1 << bit); 117 118 isa_outb(IO_ELCR1, elcr[0]); 119 isa_outb(IO_ELCR2, elcr[1]); 120} 121 122static int 123motivr_get_irq(struct pic_ops *pic, int mode) 124{ 125 int irq; 126 127 irq = i8259_get_irq(pic, mode); 128 /* read the IVR to ack it */ 129 (void)inb(pic->pic_cookie); 130 131 /* i8259_get_irq will return 255 by itself, so just pass it on */ 132 return irq; 133} 134 135static int 136prepivr_get_irq(struct pic_ops *pic, int mode) 137{ 138 int irq; 139 140 irq = inb(pic->pic_cookie); 141 142 if (irq == 0 && mode == PIC_GET_IRQ) 143 return 255; 144 if (irq == 7 && mode == PIC_GET_RECHECK) 145 return 255; 146 147 return irq; 148} 149