*****************************************************************************/
/*
- * Copyright (C) 2000 - 2004, R. Byron Moore
+ * Copyright (C) 2000 - 2006, R. Byron Moore
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
#include <acpi/acpi.h>
#define _COMPONENT ACPI_HARDWARE
- ACPI_MODULE_NAME ("hwtimer")
-
+ACPI_MODULE_NAME("hwtimer")
/******************************************************************************
*
* FUNCTION: acpi_get_timer_resolution
*
- * PARAMETERS: none
+ * PARAMETERS: Resolution - Where the resolution is returned
*
- * RETURN: Number of bits of resolution in the PM Timer (24 or 32).
+ * RETURN: Status and timer resolution
*
- * DESCRIPTION: Obtains resolution of the ACPI PM Timer.
+ * DESCRIPTION: Obtains resolution of the ACPI PM Timer (24 or 32 bits).
*
******************************************************************************/
-
-acpi_status
-acpi_get_timer_resolution (
- u32 *resolution)
+acpi_status acpi_get_timer_resolution(u32 * resolution)
{
- ACPI_FUNCTION_TRACE ("acpi_get_timer_resolution");
-
+ ACPI_FUNCTION_TRACE(acpi_get_timer_resolution);
if (!resolution) {
- return_ACPI_STATUS (AE_BAD_PARAMETER);
+ return_ACPI_STATUS(AE_BAD_PARAMETER);
}
- if (0 == acpi_gbl_FADT->tmr_val_ext) {
+ if (acpi_gbl_FADT->tmr_val_ext == 0) {
*resolution = 24;
- }
- else {
+ } else {
*resolution = 32;
}
- return_ACPI_STATUS (AE_OK);
+ return_ACPI_STATUS(AE_OK);
}
+ACPI_EXPORT_SYMBOL(acpi_get_timer_resolution)
/******************************************************************************
*
* FUNCTION: acpi_get_timer
*
- * PARAMETERS: none
+ * PARAMETERS: Ticks - Where the timer value is returned
*
- * RETURN: Current value of the ACPI PM Timer (in ticks).
+ * RETURN: Status and current timer value (ticks)
*
- * DESCRIPTION: Obtains current value of ACPI PM Timer.
+ * DESCRIPTION: Obtains current value of ACPI PM Timer (in ticks).
*
******************************************************************************/
-
-acpi_status
-acpi_get_timer (
- u32 *ticks)
+acpi_status acpi_get_timer(u32 * ticks)
{
- acpi_status status;
-
-
- ACPI_FUNCTION_TRACE ("acpi_get_timer");
+ acpi_status status;
+ ACPI_FUNCTION_TRACE(acpi_get_timer);
if (!ticks) {
- return_ACPI_STATUS (AE_BAD_PARAMETER);
+ return_ACPI_STATUS(AE_BAD_PARAMETER);
}
- status = acpi_hw_low_level_read (32, ticks, &acpi_gbl_FADT->xpm_tmr_blk);
+ status = acpi_hw_low_level_read(32, ticks, &acpi_gbl_FADT->xpm_tmr_blk);
- return_ACPI_STATUS (status);
+ return_ACPI_STATUS(status);
}
+ACPI_EXPORT_SYMBOL(acpi_get_timer)
/******************************************************************************
*
* FUNCTION: acpi_get_timer_duration
*
- * PARAMETERS: start_ticks
- * end_ticks
- * time_elapsed
+ * PARAMETERS: start_ticks - Starting timestamp
+ * end_ticks - End timestamp
+ * time_elapsed - Where the elapsed time is returned
*
- * RETURN: time_elapsed
+ * RETURN: Status and time_elapsed
*
* DESCRIPTION: Computes the time elapsed (in microseconds) between two
* PM Timer time stamps, taking into account the possibility of
* Note that this function accommodates only a single timer
* rollover. Thus for 24-bit timers, this function should only
* be used for calculating durations less than ~4.6 seconds
- * (~20 minutes for 32-bit timers) -- calculations below
+ * (~20 minutes for 32-bit timers) -- calculations below:
*
* 2**24 Ticks / 3,600,000 Ticks/Sec = 4.66 sec
* 2**32 Ticks / 3,600,000 Ticks/Sec = 1193 sec or 19.88 minutes
*
******************************************************************************/
-
acpi_status
-acpi_get_timer_duration (
- u32 start_ticks,
- u32 end_ticks,
- u32 *time_elapsed)
+acpi_get_timer_duration(u32 start_ticks, u32 end_ticks, u32 * time_elapsed)
{
- u32 delta_ticks = 0;
- union uint64_overlay normalized_ticks;
- acpi_status status;
- acpi_integer out_quotient;
-
-
- ACPI_FUNCTION_TRACE ("acpi_get_timer_duration");
+ acpi_status status;
+ u32 delta_ticks;
+ acpi_integer quotient;
+ ACPI_FUNCTION_TRACE(acpi_get_timer_duration);
if (!time_elapsed) {
- return_ACPI_STATUS (AE_BAD_PARAMETER);
+ return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/*
* Compute Tick Delta:
- * -------------------
- * Handle (max one) timer rollovers on 24- versus 32-bit timers.
+ * Handle (max one) timer rollovers on 24-bit versus 32-bit timers.
*/
if (start_ticks < end_ticks) {
delta_ticks = end_ticks - start_ticks;
- }
- else if (start_ticks > end_ticks) {
- if (0 == acpi_gbl_FADT->tmr_val_ext) {
+ } else if (start_ticks > end_ticks) {
+ if (acpi_gbl_FADT->tmr_val_ext == 0) {
+
/* 24-bit Timer */
- delta_ticks = (((0x00FFFFFF - start_ticks) + end_ticks) & 0x00FFFFFF);
- }
- else {
+ delta_ticks =
+ (((0x00FFFFFF - start_ticks) +
+ end_ticks) & 0x00FFFFFF);
+ } else {
/* 32-bit Timer */
delta_ticks = (0xFFFFFFFF - start_ticks) + end_ticks;
}
- }
- else {
+ } else { /* start_ticks == end_ticks */
+
*time_elapsed = 0;
- return_ACPI_STATUS (AE_OK);
+ return_ACPI_STATUS(AE_OK);
}
/*
- * Compute Duration:
- * -----------------
- *
- * Requires a 64-bit divide:
+ * Compute Duration (Requires a 64-bit multiply and divide):
*
* time_elapsed = (delta_ticks * 1000000) / PM_TIMER_FREQUENCY;
*/
- normalized_ticks.full = ((u64) delta_ticks) * 1000000;
+ status = acpi_ut_short_divide(((u64) delta_ticks) * 1000000,
+ PM_TIMER_FREQUENCY, "ient, NULL);
- status = acpi_ut_short_divide (&normalized_ticks.full, PM_TIMER_FREQUENCY,
- &out_quotient, NULL);
-
- *time_elapsed = (u32) out_quotient;
- return_ACPI_STATUS (status);
+ *time_elapsed = (u32) quotient;
+ return_ACPI_STATUS(status);
}
-
+ACPI_EXPORT_SYMBOL(acpi_get_timer_duration)
git://git.onelab.eu / linux-2.6.git / blobdiff