1 /* $NetBSD: pic_iocc.c,v 1.4 2011/07/18 17:26:56 dyoung 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 1.4 2011/07/18 17:26:56 dyoung Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/malloc.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 = malloc(sizeof(struct pic_ops), M_DEVBUF, M_NOWAIT); 63 KASSERT(pic != NULL); 64 65 pic->pic_numintrs = 16; 66 pic->pic_cookie = (void *)NULL; 67 pic->pic_enable_irq = iocc_enable_irq; 68 pic->pic_reenable_irq = iocc_enable_irq; 69 pic->pic_disable_irq = iocc_disable_irq; 70 pic->pic_get_irq = iocc_get_irq; 71 pic->pic_ack_irq = iocc_ack_irq; 72 pic->pic_establish_irq = dummy_pic_establish_intr; 73 pic->pic_finish_setup = NULL; 74 strcpy(pic->pic_name, "iocc"); 75 pic_add(pic); 76 77 /* set all priorities as high */ 78 for (i=0; i < pic->pic_numintrs; i++) 79 iocc_set_priority(0, 0, i); 80 return(pic); 81 } 82 83 /* 84 * the IOCC IER is a bitmask of pending IRQs, where only 0-15 are valid 85 */ 86 static int 87 iocc_get_irq(struct pic_ops *pic, int mode) 88 { 89 int irq; 90 uint32_t rv = 0; 91 92 rv = in32rb(RS6000_BUS_SPACE_IO + IOCC_IRR); 93 if (rv == 0) 94 return 255; 95 96 irq = 31 - __builtin_clz(rv); 97 if (irq >= 0 && irq < 16) 98 return irq; 99 return 255; 100 } 101 102 /* enable an IRQ on the IOCC */ 103 static void 104 iocc_enable_irq(struct pic_ops *pic, int irq, int type) 105 { 106 uint32_t mask; 107 108 mask = in32rb(RS6000_BUS_SPACE_IO + IOCC_IEE); 109 mask |= 1 << irq; 110 out32rb(RS6000_BUS_SPACE_IO + IOCC_IEE, mask); 111 } 112 113 /* disable an IRQ on the IOCC */ 114 static void 115 iocc_disable_irq(struct pic_ops *pic, int irq) 116 { 117 uint32_t mask; 118 119 mask = in32rb(RS6000_BUS_SPACE_IO + IOCC_IEE); 120 mask &= ~(1 << irq); 121 out32rb(RS6000_BUS_SPACE_IO + IOCC_IEE, mask); 122 } 123 124 /* Issue an EOI to the IOCC */ 125 static void 126 iocc_ack_irq(struct pic_ops *pic, int irq) 127 { 128 out32rb(RS6000_BUS_SPACE_IO + IOCC_EOI(irq), 0x1); /* val is ignored */ 129 } 130 131 /* set interrupt priority and destination */ 132 static void 133 iocc_set_priority(int cpu, int pri, int irq) 134 { 135 uint32_t x; 136 137 x = pri; 138 x |= cpu<<8; 139 out32rb(RS6000_BUS_SPACE_IO + IOCC_XIVR(irq), x); 140 } 141