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