isa_milan.c revision 1.10
1 /* $NetBSD: isa_milan.c,v 1.10 2009/03/14 14:45:56 dsl Exp $ */ 2 3 /*- 4 * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Leo Weppelman. 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: isa_milan.c,v 1.10 2009/03/14 14:45:56 dsl Exp $"); 34 35 #include <sys/types.h> 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/device.h> 39 40 #include <dev/isa/isavar.h> 41 #include <dev/isa/isareg.h> 42 43 #include <machine/iomap.h> 44 45 void isa_bus_init(void); 46 47 static void new_imask(void); 48 static void isa_callback(int); 49 50 /* 51 * Bitmask of currently enabled isa interrupts. Used by new_imask(). 52 */ 53 static u_int16_t imask_enable = 0xffff; 54 55 #define IRQ_SLAVE 2 /* Slave at level 2 */ 56 #define MILAN_MAX_ISA_INTS 16 /* Max. number of vectors */ 57 #define ICU_OFFSET 0 /* Interrupt vector base */ 58 59 #define WICU(icu, val) *(volatile u_int8_t*)(icu) = val 60 61 static isa_intr_info_t milan_isa_iinfo[MILAN_MAX_ISA_INTS]; 62 63 void 64 isa_bus_init() 65 { 66 volatile u_int8_t *icu; 67 68 /* 69 * Initialize both the icu's: 70 * - enter Special Mask Mode 71 * - Block all interrupts 72 */ 73 icu = (u_int8_t*)(AD_8259_MASTER); 74 75 icu[0] = 0x11; /* reset; program device, four bytes */ 76 icu[1] = ICU_OFFSET; /* starting at this vector index */ 77 icu[1] = (1 << IRQ_SLAVE); /* slave on line 2 */ 78 icu[1] = 1; /* 8086 mode */ 79 icu[1] = 0xff; /* leave interrupts masked */ 80 icu[0] = 0x68; /* special mask mode */ 81 icu[0] = 0x0a; /* Read IRR by default. */ 82 83 icu = (u_int8_t*)(AD_8259_SLAVE); 84 85 icu[0] = 0x11; /* reset; program device, four bytes */ 86 icu[1] = ICU_OFFSET + 8; /* starting at this vector index */ 87 icu[1] = IRQ_SLAVE; /* slave on line 2 */ 88 icu[1] = 1; /* 8086 mode */ 89 icu[1] = 0xff; /* leave interrupts masked */ 90 icu[0] = 0x68; /* special mask mode */ 91 icu[0] = 0x0a; /* Read IRR by default. */ 92 } 93 94 /* 95 * Determine and activate new interrupt mask by scanning the milan_isa_iinfo 96 * array for enabled interrupts. 97 */ 98 static void 99 new_imask() 100 { 101 int irq; 102 u_int16_t nmask = 0; 103 104 for (irq = 0; irq < MILAN_MAX_ISA_INTS; irq++) { 105 if (milan_isa_iinfo[irq].ifunc != NULL) 106 nmask |= 1 << irq; 107 if (nmask >= 0x100) 108 nmask |= 1 << IRQ_SLAVE; 109 } 110 imask_enable = ~nmask; 111 WICU(AD_8259_MASTER+1, imask_enable & 0xff); 112 WICU(AD_8259_SLAVE+1 , (imask_enable >> 8) & 0xff); 113 } 114 115 static void 116 isa_callback(vector) 117 int vector; 118 { 119 isa_intr_info_t *iinfo_p; 120 int s; 121 122 iinfo_p = &milan_isa_iinfo[vector]; 123 124 s = splx(iinfo_p->ipl); 125 (void) (iinfo_p->ifunc)(iinfo_p->iarg); 126 if (vector > 7) 127 WICU(AD_8259_SLAVE, 0x60 | (vector & 7)); 128 else WICU(AD_8259_MASTER, 0x60 | (vector & 7)); 129 splx(s); 130 } 131 132 void milan_isa_intr(int, int); 133 void 134 milan_isa_intr(vector, sr) 135 int vector, sr; 136 { 137 isa_intr_info_t *iinfo_p; 138 int s; 139 140 if (vector >= MILAN_MAX_ISA_INTS) { 141 printf("milan_isa_intr: Bogus vector %d\n", vector); 142 return; 143 } 144 145 /* Ack cascade 0x60 == Specific EOI */ 146 if (vector > 7) 147 WICU(AD_8259_MASTER, 0x60|IRQ_SLAVE); 148 149 iinfo_p = &milan_isa_iinfo[vector]; 150 if (iinfo_p->ifunc == NULL) { 151 printf("milan_isa_intr: Stray interrupt: %d (mask:%04x)\n", 152 vector, imask_enable); 153 return; 154 } 155 if ((sr & PSL_IPL) >= (iinfo_p->ipl & PSL_IPL)) { 156 /* 157 * We're running at a too high priority now. 158 */ 159 add_sicallback((si_farg)isa_callback, (void*)vector, 0); 160 } 161 else { 162 s = splx(iinfo_p->ipl); 163 (void) (iinfo_p->ifunc)(iinfo_p->iarg); 164 if (vector > 7) 165 WICU(AD_8259_SLAVE, 0x60 | (vector & 7)); 166 else WICU(AD_8259_MASTER, 0x60 | (vector & 7)); 167 splx(s); 168 } 169 } 170 171 /* 172 * Try to allocate a free interrupt... On the Milan, we have available: 173 * 5, 9, 10, 11, 13. Or in a bitmask: 0x1720. 174 */ 175 #define MILAN_AVAIL_ISA_INTS 0x1720 176 177 int 178 isa_intr_alloc(ic, mask, type, irq) 179 isa_chipset_tag_t ic; 180 int mask; 181 int type; 182 int *irq; 183 { 184 int i; 185 186 /* 187 * Say no to impossible questions... 188 */ 189 if (!(mask &= MILAN_AVAIL_ISA_INTS)) 190 return 1; 191 192 for (i = 0; i < MILAN_MAX_ISA_INTS; i++) { 193 if (mask & (1<<i)) { 194 if (milan_isa_iinfo[i].ifunc == NULL) { 195 *irq = i; 196 return 0; 197 } 198 } 199 } 200 return (1); 201 } 202 203 void * 204 isa_intr_establish(ic, irq, type, level, ih_fun, ih_arg) 205 isa_chipset_tag_t ic; 206 int irq, type, level; 207 int (*ih_fun)(void *); 208 void *ih_arg; 209 { 210 isa_intr_info_t *iinfo_p; 211 212 iinfo_p = &milan_isa_iinfo[irq]; 213 214 if (iinfo_p->ifunc != NULL) { 215 printf("isa_intr_establish: interrupt %d was already " 216 "established\n", irq); 217 return NULL; 218 } 219 220 iinfo_p->slot = 0; /* Unused on Milan */ 221 iinfo_p->ihand = NULL; /* Unused on Milan */ 222 iinfo_p->ipl = level; 223 iinfo_p->ifunc = ih_fun; 224 iinfo_p->iarg = ih_arg; 225 226 new_imask(); 227 return(iinfo_p); 228 } 229 230 void 231 isa_intr_disestablish(ic, handler) 232 isa_chipset_tag_t ic; 233 void *handler; 234 { 235 isa_intr_info_t *iinfo_p = (isa_intr_info_t *)handler; 236 237 if (iinfo_p->ifunc == NULL) 238 panic("isa_intr_disestablish: interrupt was not established"); 239 240 iinfo_p->ifunc = NULL; 241 new_imask(); 242 } 243
Indexes created Fri Oct 03 02:09:57 GMT 2025