1 files changed, 203 insertions, 0 deletions

diff --git a/drivers/acpi/hardware/hwtimer.c b/drivers/acpi/hardware/hwtimer.c
new file mode 100644
index 000000000000..1906167d7294
--- /dev/null
+++ b/drivers/acpi/hardware/hwtimer.c
@@ -0,0 +1,203 @@
+
+/******************************************************************************
+ *
+ * Name: hwtimer.c - ACPI Power Management Timer Interface
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2005, R. Byron Moore
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ *    substantially similar to the "NO WARRANTY" disclaimer below
+ *    ("Disclaimer") and any redistribution must be conditioned upon
+ *    including a substantially similar Disclaimer requirement for further
+ *    binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ *    of any contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ */
+
+#include <linux/module.h>
+
+#include <acpi/acpi.h>
+
+#define _COMPONENT          ACPI_HARDWARE
+         ACPI_MODULE_NAME    ("hwtimer")
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    acpi_get_timer_resolution
+ *
+ * PARAMETERS:  Resolution          - Where the resolution is returned
+ *
+ * RETURN:      Status and timer resolution
+ *
+ * DESCRIPTION: Obtains resolution of the ACPI PM Timer (24 or 32 bits).
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_get_timer_resolution (
+        u32                             *resolution)
+{
+        ACPI_FUNCTION_TRACE ("acpi_get_timer_resolution");
+
+
+        if (!resolution) {
+                return_ACPI_STATUS (AE_BAD_PARAMETER);
+        }
+
+        if (0 == acpi_gbl_FADT->tmr_val_ext) {
+                *resolution = 24;
+        }
+        else {
+                *resolution = 32;
+        }
+
+        return_ACPI_STATUS (AE_OK);
+}
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    acpi_get_timer
+ *
+ * PARAMETERS:  Ticks               - Where the timer value is returned
+ *
+ * RETURN:      Status and current ticks
+ *
+ * DESCRIPTION: Obtains current value of ACPI PM Timer (in ticks).
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_get_timer (
+        u32                             *ticks)
+{
+        acpi_status                     status;
+
+
+        ACPI_FUNCTION_TRACE ("acpi_get_timer");
+
+
+        if (!ticks) {
+                return_ACPI_STATUS (AE_BAD_PARAMETER);
+        }
+
+        status = acpi_hw_low_level_read (32, ticks, &acpi_gbl_FADT->xpm_tmr_blk);
+
+        return_ACPI_STATUS (status);
+}
+EXPORT_SYMBOL(acpi_get_timer);
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    acpi_get_timer_duration
+ *
+ * PARAMETERS:  start_ticks         - Starting timestamp
+ *              end_ticks           - End timestamp
+ *              time_elapsed        - Where the elapsed time is returned
+ *
+ * RETURN:      Status and time_elapsed
+ *
+ * DESCRIPTION: Computes the time elapsed (in microseconds) between two
+ *              PM Timer time stamps, taking into account the possibility of
+ *              rollovers, the timer resolution, and timer frequency.
+ *
+ *              The PM Timer's clock ticks at roughly 3.6 times per
+ *              _microsecond_, and its clock continues through Cx state
+ *              transitions (unlike many CPU timestamp counters) -- making it
+ *              a versatile and accurate timer.
+ *
+ *              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:
+ *
+ *              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_status                     status;
+        u32                             delta_ticks;
+        acpi_integer                    quotient;
+
+
+        ACPI_FUNCTION_TRACE ("acpi_get_timer_duration");
+
+
+        if (!time_elapsed) {
+                return_ACPI_STATUS (AE_BAD_PARAMETER);
+        }
+
+        /*
+         * Compute Tick Delta:
+         * 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) {
+                        /* 24-bit Timer */
+
+                        delta_ticks = (((0x00FFFFFF - start_ticks) + end_ticks) & 0x00FFFFFF);
+                }
+                else {
+                        /* 32-bit Timer */
+
+                        delta_ticks = (0xFFFFFFFF - start_ticks) + end_ticks;
+                }
+        }
+        else /* start_ticks == end_ticks */ {
+                *time_elapsed = 0;
+                return_ACPI_STATUS (AE_OK);
+        }
+
+        /*
+         * Compute Duration (Requires a 64-bit multiply and divide):
+         *
+         * time_elapsed = (delta_ticks * 1000000) / PM_TIMER_FREQUENCY;
+         */
+        status = acpi_ut_short_divide (((u64) delta_ticks) * 1000000,
+                         PM_TIMER_FREQUENCY, &quotient, NULL);
+
+        *time_elapsed = (u32) quotient;
+        return_ACPI_STATUS (status);
+}
+EXPORT_SYMBOL(acpi_get_timer_duration);
+