1 /* $NetBSD: pic_prepivr.c,v 1.8 2012/07/28 23:11:01 matt 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 1.8 2012/07/28 23:11:01 matt 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 49 static int prepivr_get_irq(struct pic_ops *, int); 50 static int motivr_get_irq(struct pic_ops *, int); 51 static void prepivr_establish_irq(struct pic_ops *, int, int, int); 52 53 extern vaddr_t prep_intr_reg; /* PReP interrupt vector register */ 54 extern 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 65 struct pic_ops * 66 setup_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 KASSERT(prepivr != NULL); 74 pic = &prepivr->pic; 75 76 pivr = prep_intr_reg + prep_intr_reg_off; 77 pic->pic_numintrs = 16; 78 pic->pic_cookie = (void *)pivr; 79 pic->pic_enable_irq = i8259_enable_irq; 80 pic->pic_reenable_irq = i8259_enable_irq; 81 pic->pic_disable_irq = i8259_disable_irq; 82 if (ivrtype == PIC_IVR_MOT) 83 pic->pic_get_irq = motivr_get_irq; 84 else 85 pic->pic_get_irq = prepivr_get_irq; 86 pic->pic_ack_irq = i8259_ack_irq; 87 pic->pic_establish_irq = prepivr_establish_irq; 88 pic->pic_finish_setup = NULL; 89 strcpy(pic->pic_name, "prepivr"); 90 pic_add(pic); 91 prepivr->pending_events = 0; 92 prepivr->enable_mask = 0xffffffff; 93 prepivr->irqs = 0; 94 95 /* initialize the ELCR */ 96 isa_outb(IO_ELCR1, (0 >> 0) & 0xff); 97 isa_outb(IO_ELCR2, (0 >> 8) & 0xff); 98 i8259_initialize(); 99 100 return pic; 101 } 102 103 static void 104 prepivr_establish_irq(struct pic_ops *pic, int irq, int type, int maxlevel) 105 { 106 u_int8_t elcr[2]; 107 int icu, bit; 108 109 icu = irq / 8; 110 bit = irq % 8; 111 elcr[0] = isa_inb(IO_ELCR1); 112 elcr[1] = isa_inb(IO_ELCR2); 113 114 if (type == IST_LEVEL) 115 elcr[icu] |= 1 << bit; 116 else 117 elcr[icu] &= ~(1 << bit); 118 119 isa_outb(IO_ELCR1, elcr[0]); 120 isa_outb(IO_ELCR2, elcr[1]); 121 } 122 123 static int 124 motivr_get_irq(struct pic_ops *pic, int mode) 125 { 126 int irq; 127 128 irq = i8259_get_irq(pic, mode); 129 /* read the IVR to ack it */ 130 (void)inb(pic->pic_cookie); 131 132 /* i8259_get_irq will return 255 by itself, so just pass it on */ 133 return irq; 134 } 135 136 static int 137 prepivr_get_irq(struct pic_ops *pic, int mode) 138 { 139 int irq; 140 141 irq = inb(pic->pic_cookie); 142 143 if (irq == 0 && mode == PIC_GET_IRQ) 144 return 255; 145 if (irq == 7 && mode == PIC_GET_RECHECK) 146 return 255; 147 148 return irq; 149 } 150