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acpi_timer.c (80442) acpi_timer.c (80602)
1/*-
2 * Copyright (c) 2000, 2001 Michael Smith
3 * Copyright (c) 2000 BSDi
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:

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19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
1/*-
2 * Copyright (c) 2000, 2001 Michael Smith
3 * Copyright (c) 2000 BSDi
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:

--- 10 unchanged lines hidden (view full) ---

19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * $FreeBSD: head/sys/dev/acpica/acpi_timer.c 80442 2001-07-27 09:01:13Z msmith $
27 * $FreeBSD: head/sys/dev/acpica/acpi_timer.c 80602 2001-07-30 08:57:55Z msmith $
28 */
28 */
29/*
30 * ----------------------------------------------------------------------------
31 * "THE BEER-WARE LICENSE" (Revision 42):
32 * <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
33 * can do whatever you want with this stuff. If we meet some day, and you think
34 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
35 * ----------------------------------------------------------------------------
36 */
37#include "opt_acpi.h"
38#include <sys/param.h>
39#include <sys/bus.h>
40#include <sys/kernel.h>
41#include <sys/sysctl.h>
42#include <sys/timetc.h>
43
44#include <machine/bus_pio.h>

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63#define _COMPONENT ACPI_SYSTEM
64MODULE_NAME("TIMER")
65
66static device_t acpi_timer_dev;
67struct resource *acpi_timer_reg;
68#define TIMER_READ bus_space_read_4(rman_get_bustag(acpi_timer_reg), \
69 rman_get_bushandle(acpi_timer_reg), \
70 0)
29#include "opt_acpi.h"
30#include <sys/param.h>
31#include <sys/bus.h>
32#include <sys/kernel.h>
33#include <sys/sysctl.h>
34#include <sys/timetc.h>
35
36#include <machine/bus_pio.h>

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55#define _COMPONENT ACPI_SYSTEM
56MODULE_NAME("TIMER")
57
58static device_t acpi_timer_dev;
59struct resource *acpi_timer_reg;
60#define TIMER_READ bus_space_read_4(rman_get_bustag(acpi_timer_reg), \
61 rman_get_bushandle(acpi_timer_reg), \
62 0)
71static int acpi_timer_flags;
72/*
73 * ] 20. ACPI Timer Errata
74 * ]
75 * ] Problem: The power management timer may return improper result when
76 * ] read. Although the timer value settles properly after incrementing,
77 * ] while incrementing there is a 3nS window every 69.8nS where the
78 * ] timer value is indeterminate (a 4.2% chance that the data will be
79 * ] incorrect when read). As a result, the ACPI free running count up
80 * ] timer specification is violated due to erroneous reads. Implication:
81 * ] System hangs due to the "inaccuracy" of the timer when used by
82 * ] software for time critical events and delays.
83 * ]
84 * ] Workaround: Read the register twice and compare.
85 * ] Status: This will not be fixed in the PIIX4 or PIIX4E, it is fixed
86 * ] in the PIIX4M.
87 *
88 * The counter is in other words not latched to the PCI bus clock when
89 * read. Notice the workaround isn't: We need to read until we have
90 * three monotonic samples and then use the middle one, otherwise we are
91 * not protected against the fact that the bits can be wrong in two
92 * directions. If we only cared about monosity two reads would be enough.
93 */
94#define TFLAG_NEED_PIIX_WAR (1 << 0)
95
96static u_int acpi_timer_frequency = 14318182/4;
97
98static void acpi_timer_identify(driver_t *driver, device_t parent);
99static int acpi_timer_probe(device_t dev);
100static int acpi_timer_attach(device_t dev);
63
64static u_int acpi_timer_frequency = 14318182/4;
65
66static void acpi_timer_identify(driver_t *driver, device_t parent);
67static int acpi_timer_probe(device_t dev);
68static int acpi_timer_attach(device_t dev);
101static int acpi_timer_pci_probe(device_t dev);
102static unsigned acpi_timer_get_timecount(struct timecounter *tc);
103static int acpi_timer_sysctl_freq(SYSCTL_HANDLER_ARGS);
104static void acpi_timer_test(void);
105
106/*
107 * Driver hung off ACPI.
108 */
109static device_method_t acpi_timer_methods[] = {

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119 acpi_timer_methods,
120 0,
121};
122
123devclass_t acpi_timer_devclass;
124DRIVER_MODULE(acpi_timer, acpi, acpi_timer_driver, acpi_timer_devclass, 0, 0);
125
126/*
69static unsigned acpi_timer_get_timecount(struct timecounter *tc);
70static int acpi_timer_sysctl_freq(SYSCTL_HANDLER_ARGS);
71static void acpi_timer_test(void);
72
73/*
74 * Driver hung off ACPI.
75 */
76static device_method_t acpi_timer_methods[] = {

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86 acpi_timer_methods,
87 0,
88};
89
90devclass_t acpi_timer_devclass;
91DRIVER_MODULE(acpi_timer, acpi, acpi_timer_driver, acpi_timer_devclass, 0, 0);
92
93/*
127 * Chipset workaround driver hung off PCI.
128 */
129static device_method_t acpi_timer_pci_methods[] = {
130 DEVMETHOD(device_probe, acpi_timer_pci_probe),
131 {0, 0}
132};
133
134static driver_t acpi_timer_pci_driver = {
135 "acpi_timer_pci",
136 acpi_timer_pci_methods,
137 0,
138};
139
140devclass_t acpi_timer_pci_devclass;
141DRIVER_MODULE(acpi_timer_pci, pci, acpi_timer_pci_driver, acpi_timer_pci_devclass, 0, 0);
142
143/*
144 * Timecounter.
145 */
146static struct timecounter acpi_timer_timecounter = {
147 acpi_timer_get_timecount,
148 0,
149 0xffffff,
150 0,
151 "ACPI"

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182 bus_set_resource(dev, SYS_RES_IOPORT, rid, AcpiGbl_FADT->V1_PmTmrBlk, sizeof(u_int32_t));
183 if ((acpi_timer_reg = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 0, ~0, 1, RF_ACTIVE)) == NULL) {
184 device_printf(dev, "couldn't allocate I/O resource (port 0x%x)\n", AcpiGbl_FADT->V1_PmTmrBlk);
185 return_VOID;
186 }
187 if (getenv("debug.acpi.timer_test") != NULL)
188 acpi_timer_test();
189
94 * Timecounter.
95 */
96static struct timecounter acpi_timer_timecounter = {
97 acpi_timer_get_timecount,
98 0,
99 0xffffff,
100 0,
101 "ACPI"

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132 bus_set_resource(dev, SYS_RES_IOPORT, rid, AcpiGbl_FADT->V1_PmTmrBlk, sizeof(u_int32_t));
133 if ((acpi_timer_reg = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 0, ~0, 1, RF_ACTIVE)) == NULL) {
134 device_printf(dev, "couldn't allocate I/O resource (port 0x%x)\n", AcpiGbl_FADT->V1_PmTmrBlk);
135 return_VOID;
136 }
137 if (getenv("debug.acpi.timer_test") != NULL)
138 acpi_timer_test();
139
140 acpi_timer_timecounter.tc_get_timecount = acpi_timer_get_timecount;
190 acpi_timer_timecounter.tc_frequency = acpi_timer_frequency;
191 tc_init(&acpi_timer_timecounter);
192
193 sprintf(desc, "%d-bit timer at 3.579545MHz", AcpiGbl_FADT->TmrValExt ? 32 : 24);
194 device_set_desc_copy(dev, desc);
195
196 return_VOID;
197}

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206
207static int
208acpi_timer_attach(device_t dev)
209{
210 return(0);
211}
212
213/*
141 acpi_timer_timecounter.tc_frequency = acpi_timer_frequency;
142 tc_init(&acpi_timer_timecounter);
143
144 sprintf(desc, "%d-bit timer at 3.579545MHz", AcpiGbl_FADT->TmrValExt ? 32 : 24);
145 device_set_desc_copy(dev, desc);
146
147 return_VOID;
148}

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157
158static int
159acpi_timer_attach(device_t dev)
160{
161 return(0);
162}
163
164/*
214 * Look at PCI devices as they go past, and if we detect a PIIX4 older than
215 * the PIIX4M, set the PIIX_WAR flag.
216 *
217 * XXX do we know that other timecounters work? Interesting question.
218 */
219static int
220acpi_timer_pci_probe(device_t dev)
221{
222 if ((pci_get_vendor(dev) == 0x8086) &&
223 (pci_get_device(dev) == 0x7113) &&
224 (pci_get_revid(dev) < 0x03)) {
225 acpi_timer_flags |= TFLAG_NEED_PIIX_WAR;
226 device_printf(acpi_timer_dev, "enabling PIIX4 timer workaround\n");
227 }
228
229 return(ENXIO); /* we never match anything */
230}
231
232/*
233 * Fetch current time value from hardware.
165 * Fetch current time value from hardware.
234 *
235 * XXX This is currently written to be "correct", not
236 * "fast". Optimisation is strongly indicated.
237 */
238static unsigned
239acpi_timer_get_timecount(struct timecounter *tc)
240{
166 */
167static unsigned
168acpi_timer_get_timecount(struct timecounter *tc)
169{
241 unsigned u1, u2, u3;
242
243 if (acpi_timer_flags & TFLAG_NEED_PIIX_WAR) {
244 u2 = TIMER_READ;
245 u3 = TIMER_READ;
246 do {
247 u1 = u2;
248 u2 = u3;
249 u3 = TIMER_READ;
250 } while (u1 > u2 || u2 > u3);
251 return (u2);
252 } else {
253 return(TIMER_READ);
254 }
170 return(TIMER_READ);
255}
256
257/*
258 * Timecounter freqency adjustment interface.
259 */
260static int
261acpi_timer_sysctl_freq(SYSCTL_HANDLER_ARGS)
262{

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303 u1, u2, u3);
304 }
305 u1 = u2;
306 u2 = u3;
307 u3 = TIMER_READ;
308 }
309}
310
171}
172
173/*
174 * Timecounter freqency adjustment interface.
175 */
176static int
177acpi_timer_sysctl_freq(SYSCTL_HANDLER_ARGS)
178{

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219 u1, u2, u3);
220 }
221 u1 = u2;
222 u2 = u3;
223 u3 = TIMER_READ;
224 }
225}
226
227/*
228 * Chipset workaround driver hung off PCI.
229 *
230 * ] 20. ACPI Timer Errata
231 * ]
232 * ] Problem: The power management timer may return improper result when
233 * ] read. Although the timer value settles properly after incrementing,
234 * ] while incrementing there is a 3nS window every 69.8nS where the
235 * ] timer value is indeterminate (a 4.2% chance that the data will be
236 * ] incorrect when read). As a result, the ACPI free running count up
237 * ] timer specification is violated due to erroneous reads. Implication:
238 * ] System hangs due to the "inaccuracy" of the timer when used by
239 * ] software for time critical events and delays.
240 * ]
241 * ] Workaround: Read the register twice and compare.
242 * ] Status: This will not be fixed in the PIIX4 or PIIX4E, it is fixed
243 * ] in the PIIX4M.
244 *
245 * The counter is in other words not latched to the PCI bus clock when
246 * read. Notice the workaround isn't: We need to read until we have
247 * three monotonic samples and then use the middle one, otherwise we are
248 * not protected against the fact that the bits can be wrong in two
249 * directions. If we only cared about monosity two reads would be enough.
250 */
251
252static int acpi_timer_pci_probe(device_t dev);
253static unsigned acpi_timer_get_timecount_piix(struct timecounter *tc);
254
255static device_method_t acpi_timer_pci_methods[] = {
256 DEVMETHOD(device_probe, acpi_timer_pci_probe),
257 {0, 0}
258};
259
260static driver_t acpi_timer_pci_driver = {
261 "acpi_timer_pci",
262 acpi_timer_pci_methods,
263 0,
264};
265
266devclass_t acpi_timer_pci_devclass;
267DRIVER_MODULE(acpi_timer_pci, pci, acpi_timer_pci_driver, acpi_timer_pci_devclass, 0, 0);
268
269/*
270 * Look at PCI devices as they go past, and if we detect a PIIX4 older than
271 * the PIIX4M, use an alternate get_timecount routine.
272 *
273 * XXX do we know that other timecounters work? Perhaps we should test them?
274 */
275static int
276acpi_timer_pci_probe(device_t dev)
277{
278 if ((pci_get_vendor(dev) == 0x8086) &&
279 (pci_get_device(dev) == 0x7113) &&
280 (pci_get_revid(dev) < 0x03)) {
281 acpi_timer_timecounter.tc_get_timecount = acpi_timer_get_timecount_piix;
282 acpi_timer_timecounter.tc_name = "ACPI-PIIX";
283 device_printf(acpi_timer_dev, "enabling PIIX4 timer workaround\n");
284 }
285
286 return(ENXIO); /* we never match anything */
287}
288
289/*
290 * Read the buggy PIIX4 ACPI timer and compensate for its behaviour.
291 */
292static unsigned
293acpi_timer_get_timecount_piix(struct timecounter *tc)
294{
295 unsigned u1, u2, u3;
296
297 u2 = TIMER_READ;
298 u3 = TIMER_READ;
299 do {
300 u1 = u2;
301 u2 = u3;
302 u3 = TIMER_READ;
303 } while (u1 > u2 || u2 > u3);
304 return (u2);
305}
306