acpi/fadt: Make sure that SCI IRQ is valid
[dragonfly.git] / sys / platform / pc32 / acpica5 / acpi_fadt.c
CommitLineData
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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>
52234ee9 37#include <sys/interrupt.h>
05ba9093 38#include <sys/kernel.h>
5e2a2352 39#include <sys/machintr.h>
05ba9093 40#include <sys/systm.h>
6355d931 41#include <sys/thread2.h>
05ba9093 42
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43#include "acpi_sdt.h"
44#include "acpi_sdt_var.h"
5e2a2352 45#include "acpi_sci_var.h"
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46
47#define FADT_VPRINTF(fmt, arg...) \
48do { \
49 if (bootverbose) \
50 kprintf("ACPI FADT: " fmt , ##arg); \
51} while (0)
52
53/* Fixed ACPI Description Table */
54struct acpi_fadt {
55 struct acpi_sdth fadt_hdr;
56 uint32_t fadt_fw_ctrl;
57 uint32_t fadt_dsdt;
58 uint8_t fadt_rsvd1;
59 uint8_t fadt_pm_prof;
60 uint16_t fadt_sci_int;
61 uint32_t fadt_smi_cmd;
62 uint8_t fadt_acpi_en;
63 uint8_t fadt_acpi_dis;
64 uint8_t fadt_s4bios;
65 uint8_t fadt_pstate;
66 /* More ... */
67} __packed;
68
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69struct acpi_sci_mode {
70 enum intr_trigger sci_trig;
71 enum intr_polarity sci_pola;
72};
73
05ba9093 74static int acpi_sci_irq = -1;
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75static enum intr_trigger acpi_sci_trig = INTR_TRIGGER_CONFORM;
76static enum intr_polarity acpi_sci_pola = INTR_POLARITY_CONFORM;
05ba9093 77
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78static const struct acpi_sci_mode acpi_sci_modes[] = {
79 /*
80 * NOTE: Order is critical
81 */
82 { INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW },
83 { INTR_TRIGGER_LEVEL, INTR_POLARITY_HIGH },
84 { INTR_TRIGGER_EDGE, INTR_POLARITY_HIGH },
85 { INTR_TRIGGER_EDGE, INTR_POLARITY_LOW },
86
87 /* Required last entry */
88 { INTR_TRIGGER_CONFORM, INTR_POLARITY_CONFORM }
89};
90
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91static void
92fadt_probe(void)
93{
94 struct acpi_fadt *fadt;
95 vm_paddr_t fadt_paddr;
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96 enum intr_trigger trig;
97 enum intr_polarity pola;
98 int enabled = 1;
99 char *env;
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100
101 fadt_paddr = sdt_search(ACPI_FADT_SIG);
102 if (fadt_paddr == 0) {
103 kprintf("fadt_probe: can't locate FADT\n");
104 return;
105 }
106
107 fadt = sdt_sdth_map(fadt_paddr);
108 KKASSERT(fadt != NULL);
109
110 /*
111 * FADT in ACPI specification 1.0 - 4.0
112 */
113 if (fadt->fadt_hdr.sdth_rev < 1 || fadt->fadt_hdr.sdth_rev > 4) {
114 kprintf("fadt_probe: unsupported FADT revision %d\n",
115 fadt->fadt_hdr.sdth_rev);
116 goto back;
117 }
118
119 if (fadt->fadt_hdr.sdth_len < sizeof(*fadt)) {
120 kprintf("fadt_probe: invalid FADT length %u\n",
121 fadt->fadt_hdr.sdth_len);
122 goto back;
123 }
124
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125 kgetenv_int("hw.acpi.sci.enabled", &enabled);
126 if (!enabled)
127 goto back;
128
05ba9093 129 acpi_sci_irq = fadt->fadt_sci_int;
05ba9093 130
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131 env = kgetenv("hw.acpi.sci.trigger");
132 if (env == NULL)
133 goto back;
134
135 trig = INTR_TRIGGER_CONFORM;
136 if (strcmp(env, "edge") == 0)
137 trig = INTR_TRIGGER_EDGE;
138 else if (strcmp(env, "level") == 0)
139 trig = INTR_TRIGGER_LEVEL;
140
141 kfreeenv(env);
142
143 if (trig == INTR_TRIGGER_CONFORM)
144 goto back;
145
146 env = kgetenv("hw.acpi.sci.polarity");
147 if (env == NULL)
148 goto back;
149
150 pola = INTR_POLARITY_CONFORM;
151 if (strcmp(env, "high") == 0)
152 pola = INTR_POLARITY_HIGH;
153 else if (strcmp(env, "low") == 0)
154 pola = INTR_POLARITY_LOW;
155
156 kfreeenv(env);
157
158 if (pola == INTR_POLARITY_CONFORM)
159 goto back;
160
161 acpi_sci_trig = trig;
162 acpi_sci_pola = pola;
05ba9093 163back:
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164 if (acpi_sci_irq >= 0) {
165 FADT_VPRINTF("SCI irq %d, %s/%s\n", acpi_sci_irq,
166 intr_str_trigger(acpi_sci_trig),
167 intr_str_polarity(acpi_sci_pola));
168 } else {
169 FADT_VPRINTF("SCI is disabled\n");
170 }
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171 sdt_sdth_unmap(&fadt->fadt_hdr);
172}
173SYSINIT(fadt_probe, SI_BOOT2_PRESMP, SI_ORDER_SECOND, fadt_probe, 0);
5e2a2352 174
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175static void
176acpi_sci_dummy_intr(void *dummy __unused, void *frame __unused)
177{
178}
179
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180void
181acpi_sci_config(void)
182{
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183 const struct acpi_sci_mode *mode;
184
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185 KKASSERT(mycpuid == 0);
186
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187 if (machintr_legacy_intr_find(acpi_sci_irq,
188 INTR_TRIGGER_CONFORM, INTR_POLARITY_CONFORM) < 0) {
189 kprintf("ACPI FADT: SCI irq %d is invalid, disable\n",
190 acpi_sci_irq);
191 acpi_sci_irq = -1;
192 return;
193 }
194
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195 if (acpi_sci_irq < 0)
196 return;
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197
198 if (acpi_sci_trig != INTR_TRIGGER_CONFORM) {
199 KKASSERT(acpi_sci_pola != INTR_POLARITY_CONFORM);
bec969af 200 machintr_legacy_intr_config(acpi_sci_irq,
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201 acpi_sci_trig, acpi_sci_pola);
202 return;
203 }
204
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205 kprintf("ACPI FADT: SCI testing interrupt mode ...\n");
206 for (mode = acpi_sci_modes; mode->sci_trig != INTR_TRIGGER_CONFORM;
207 ++mode) {
208 void *sci_desc;
209 long last_cnt;
210
211 FADT_VPRINTF("SCI testing %s/%s\n",
212 intr_str_trigger(mode->sci_trig),
213 intr_str_polarity(mode->sci_pola));
214
c83c147e 215 last_cnt = get_interrupt_counter(acpi_sci_irq, 0);
5e2a2352 216
bec969af 217 machintr_legacy_intr_config(acpi_sci_irq,
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218 mode->sci_trig, mode->sci_pola);
219
220 sci_desc = register_int(acpi_sci_irq,
221 acpi_sci_dummy_intr, NULL, "sci", NULL,
222 INTR_EXCL | INTR_CLOCK |
6355d931 223 INTR_NOPOLL | INTR_MPSAFE | INTR_NOENTROPY, 0);
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224
225 DELAY(100 * 1000);
226
6355d931 227 unregister_int(sci_desc, 0);
52234ee9 228
c83c147e 229 if (get_interrupt_counter(acpi_sci_irq, 0) - last_cnt < 20) {
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230 acpi_sci_trig = mode->sci_trig;
231 acpi_sci_pola = mode->sci_pola;
232
233 kprintf("ACPI FADT: SCI select %s/%s\n",
234 intr_str_trigger(acpi_sci_trig),
235 intr_str_polarity(acpi_sci_pola));
236 return;
237 }
5e2a2352 238 }
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239
240 kprintf("ACPI FADT: no suitable interrupt mode for SCI, disable\n");
241 acpi_sci_irq = -1;
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242}
243
244int
245acpi_sci_enabled(void)
246{
247 if (acpi_sci_irq >= 0)
248 return 1;
249 else
250 return 0;
251}
252
253int
254acpi_sci_pci_shariable(void)
255{
256 if (acpi_sci_irq >= 0 &&
257 acpi_sci_trig == INTR_TRIGGER_LEVEL &&
258 acpi_sci_pola == INTR_POLARITY_LOW)
259 return 1;
260 else
261 return 0;
262}
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263
264int
265acpi_sci_irqno(void)
266{
267 return acpi_sci_irq;
268}