1 /* 2 * Copyright (c) 2009 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Sepherosa Ziehau <sepherosa@gmail.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/param.h> 36 #include <sys/bus.h> 37 #include <sys/interrupt.h> 38 #include <sys/kernel.h> 39 #include <sys/machintr.h> 40 #include <sys/systm.h> 41 #include <sys/thread2.h> 42 43 #include <contrib/dev/acpica/source/include/acpi.h> 44 45 #include "acpi_sdt_var.h" 46 #include "acpi_sci_var.h" 47 48 #define FADT_VPRINTF(fmt, arg...) \ 49 do { \ 50 if (bootverbose) \ 51 kprintf("ACPI FADT: " fmt , ##arg); \ 52 } while (0) 53 54 struct acpi_sci_mode { 55 enum intr_trigger sci_trig; 56 enum intr_polarity sci_pola; 57 }; 58 59 static int acpi_sci_irq = -1; 60 static enum intr_trigger acpi_sci_trig = INTR_TRIGGER_CONFORM; 61 static enum intr_polarity acpi_sci_pola = INTR_POLARITY_CONFORM; 62 static const struct acpi_sci_mode *acpi_sci_mode1 = NULL; 63 64 static const struct acpi_sci_mode acpi_sci_modes[] = { 65 /* 66 * NOTE: Order is critical 67 */ 68 { INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW }, 69 { INTR_TRIGGER_LEVEL, INTR_POLARITY_HIGH }, 70 { INTR_TRIGGER_EDGE, INTR_POLARITY_HIGH }, 71 { INTR_TRIGGER_EDGE, INTR_POLARITY_LOW }, 72 73 /* Required last entry */ 74 { INTR_TRIGGER_CONFORM, INTR_POLARITY_CONFORM } 75 }; 76 77 static void 78 fadt_probe(void) 79 { 80 ACPI_TABLE_FADT *fadt; 81 vm_paddr_t fadt_paddr; 82 enum intr_trigger trig; 83 enum intr_polarity pola; 84 int enabled = 1; 85 char *env; 86 87 fadt_paddr = sdt_search(ACPI_SIG_FADT); 88 if (fadt_paddr == 0) { 89 kprintf("fadt_probe: can't locate FADT\n"); 90 return; 91 } 92 93 fadt = sdt_sdth_map(fadt_paddr); 94 KKASSERT(fadt != NULL); 95 96 /* 97 * FADT in ACPI specification 1.0 - 6.0 98 */ 99 if (fadt->Header.Revision < 1 || fadt->Header.Revision > 6) { 100 kprintf("fadt_probe: unknown FADT revision %d\n", 101 fadt->Header.Revision); 102 } 103 104 if (fadt->Header.Length < ACPI_FADT_V1_SIZE) { 105 kprintf("fadt_probe: invalid FADT length %u (< %u)\n", 106 fadt->Header.Length, ACPI_FADT_V1_SIZE); 107 goto back; 108 } 109 110 kgetenv_int("hw.acpi.sci.enabled", &enabled); 111 if (!enabled) 112 goto back; 113 114 acpi_sci_irq = fadt->SciInterrupt; 115 116 env = kgetenv("hw.acpi.sci.trigger"); 117 if (env == NULL) 118 goto back; 119 120 trig = INTR_TRIGGER_CONFORM; 121 if (strcmp(env, "edge") == 0) 122 trig = INTR_TRIGGER_EDGE; 123 else if (strcmp(env, "level") == 0) 124 trig = INTR_TRIGGER_LEVEL; 125 126 kfreeenv(env); 127 128 if (trig == INTR_TRIGGER_CONFORM) 129 goto back; 130 131 env = kgetenv("hw.acpi.sci.polarity"); 132 if (env == NULL) 133 goto back; 134 135 pola = INTR_POLARITY_CONFORM; 136 if (strcmp(env, "high") == 0) 137 pola = INTR_POLARITY_HIGH; 138 else if (strcmp(env, "low") == 0) 139 pola = INTR_POLARITY_LOW; 140 141 kfreeenv(env); 142 143 if (pola == INTR_POLARITY_CONFORM) 144 goto back; 145 146 acpi_sci_trig = trig; 147 acpi_sci_pola = pola; 148 back: 149 if (acpi_sci_irq >= 0) { 150 FADT_VPRINTF("SCI irq %d, %s/%s\n", acpi_sci_irq, 151 intr_str_trigger(acpi_sci_trig), 152 intr_str_polarity(acpi_sci_pola)); 153 } else { 154 FADT_VPRINTF("SCI is disabled\n"); 155 } 156 sdt_sdth_unmap(&fadt->Header); 157 } 158 SYSINIT(fadt_probe, SI_BOOT2_PRESMP, SI_ORDER_SECOND, fadt_probe, 0); 159 160 static void 161 acpi_sci_dummy_intr(void *dummy __unused, void *frame __unused) 162 { 163 } 164 165 static boolean_t 166 acpi_sci_test(const struct acpi_sci_mode *mode) 167 { 168 void *sci_desc; 169 long last_cnt; 170 171 FADT_VPRINTF("SCI testing %s/%s\n", 172 intr_str_trigger(mode->sci_trig), 173 intr_str_polarity(mode->sci_pola)); 174 175 last_cnt = get_interrupt_counter(acpi_sci_irq, 0); 176 177 machintr_legacy_intr_config(acpi_sci_irq, 178 mode->sci_trig, mode->sci_pola); 179 180 sci_desc = register_int(acpi_sci_irq, 181 acpi_sci_dummy_intr, NULL, "sci", NULL, 182 INTR_EXCL | INTR_CLOCK | 183 INTR_NOPOLL | INTR_MPSAFE | INTR_NOENTROPY, 0); 184 185 DELAY(100 * 1000); 186 187 unregister_int(sci_desc, 0); 188 189 if (get_interrupt_counter(acpi_sci_irq, 0) - last_cnt < 20) { 190 acpi_sci_trig = mode->sci_trig; 191 acpi_sci_pola = mode->sci_pola; 192 193 kprintf("ACPI FADT: SCI select %s/%s\n", 194 intr_str_trigger(acpi_sci_trig), 195 intr_str_polarity(acpi_sci_pola)); 196 return TRUE; 197 } 198 return FALSE; 199 } 200 201 void 202 acpi_sci_config(void) 203 { 204 const struct acpi_sci_mode *mode; 205 206 KKASSERT(mycpuid == 0); 207 208 if (machintr_legacy_intr_find(acpi_sci_irq, 209 INTR_TRIGGER_CONFORM, INTR_POLARITY_CONFORM) < 0) { 210 kprintf("ACPI FADT: SCI irq %d is invalid, disable\n", 211 acpi_sci_irq); 212 acpi_sci_irq = -1; 213 return; 214 } 215 216 if (acpi_sci_irq < 0) 217 return; 218 219 if (acpi_sci_trig != INTR_TRIGGER_CONFORM) { 220 KKASSERT(acpi_sci_pola != INTR_POLARITY_CONFORM); 221 machintr_legacy_intr_config(acpi_sci_irq, 222 acpi_sci_trig, acpi_sci_pola); 223 return; 224 } 225 226 kprintf("ACPI FADT: SCI testing interrupt mode ...\n"); 227 if (acpi_sci_mode1 != NULL) { 228 if (acpi_sci_test(acpi_sci_mode1)) 229 return; 230 } 231 for (mode = acpi_sci_modes; mode->sci_trig != INTR_TRIGGER_CONFORM; 232 ++mode) { 233 if (mode == acpi_sci_mode1) 234 continue; 235 if (acpi_sci_test(mode)) 236 return; 237 } 238 239 kprintf("ACPI FADT: no suitable interrupt mode for SCI, disable\n"); 240 acpi_sci_irq = -1; 241 } 242 243 int 244 acpi_sci_enabled(void) 245 { 246 if (acpi_sci_irq >= 0) 247 return 1; 248 else 249 return 0; 250 } 251 252 int 253 acpi_sci_pci_shareable(void) 254 { 255 if (acpi_sci_irq >= 0 && 256 acpi_sci_trig == INTR_TRIGGER_LEVEL && 257 acpi_sci_pola == INTR_POLARITY_LOW) 258 return 1; 259 else 260 return 0; 261 } 262 263 int 264 acpi_sci_irqno(void) 265 { 266 return acpi_sci_irq; 267 } 268 269 void 270 acpi_sci_setmode1(enum intr_trigger trig, enum intr_polarity pola) 271 { 272 const struct acpi_sci_mode *mode; 273 274 for (mode = acpi_sci_modes; mode->sci_trig != INTR_TRIGGER_CONFORM; 275 ++mode) { 276 if (mode->sci_trig == trig && mode->sci_pola == pola) { 277 acpi_sci_mode1 = mode; 278 return; 279 } 280 } 281 } 282