mirror of
https://github.com/apache/nuttx.git
synced 2026-05-20 04:16:35 +08:00
Add SAM3/4 RTT driver. From Bob Doiron
This commit is contained in:
Gregory Nutt
@@ -134,6 +134,10 @@ ifeq ($(CONFIG_SAM34_RTC),y)
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CHIP_CSRCS += sam_rtc.c
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endif
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ifeq ($(CONFIG_SAM34_RTT),y)
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CHIP_CSRCS += sam_rtt.c
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endif
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ifeq ($(CONFIG_SAM34_WDT),y)
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CHIP_CSRCS += sam_wdt.c
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endif
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@@ -54,20 +54,25 @@
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#include "up_arch.h"
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#include "sam_rtc.h"
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#if defined(CONFIG_RTC_HIRES) && defined (CONFIG_SAM34_RTT)
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# include "sam_rtt.h"
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# include "sam_periphclks.h"
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#endif
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#ifdef CONFIG_RTC
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/************************************************************************************
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* Pre-processor Definitions
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************************************************************************************/
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/* Configuration ********************************************************************/
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/* This RTC implementation supports only date/time RTC hardware */
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#ifndef CONFIG_RTC_DATETIME
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# error "CONFIG_RTC_DATETIME must be set to use this driver"
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#endif
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#ifdef CONFIG_RTC_HIRES
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# error "CONFIG_RTC_HIRES must NOT be set with this driver"
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# if !defined(CONFIG_SAM34_RTT)
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# error RTT is required to emulate high resolution RTC
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# endif
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# if (CONFIG_RTC_FREQUENCY > 32768) || ((32768 % CONFIG_RTC_FREQUENCY) != 0)
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# error CONFIG_RTC_FREQUENCY must be an integer division of 32768
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# endif
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#endif
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#if defined(CONFIG_RTC_ALARM) && !defined(CONFIG_SCHED_WORKQUEUE)
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@@ -119,6 +124,12 @@ struct work_s g_alarmwork;
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volatile bool g_rtc_enabled = false;
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/* g_rtt_offset holds the rtt->rtc count offset */
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#if defined(CONFIG_RTC_HIRES) && defined (CONFIG_SAM34_RTT)
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uint32_t g_rtt_offset = 0;
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#endif
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/************************************************************************************
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* Private Functions
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************************************************************************************/
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@@ -302,6 +313,40 @@ static int rtc_interrupt(int irq, void *context)
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}
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#endif
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/************************************************************************************
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* Name: rtc_sync
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*
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* Description:
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* Waits and returns immediately after 1 sec tick. For best accuracy,
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* call with interrupts disabled.
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*
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* Returns value of the TIMR register
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*
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************************************************************************************/
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static uint32_t rtc_sync(void)
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{
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uint32_t r0, r1;
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/* Get start second (stable) */
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do
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{
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r0 = getreg32(SAM_RTC_TIMR);
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}
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while (r0 != getreg32(SAM_RTC_TIMR));
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/* Now read until it changes */
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do
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{
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r1 = getreg32(SAM_RTC_TIMR);
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}
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while (r1 == r0);
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return r1;
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}
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/************************************************************************************
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* Public Functions
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************************************************************************************/
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@@ -370,6 +415,32 @@ int up_rtcinitialize(void)
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#endif
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#if defined(CONFIG_RTC_HIRES) && defined (CONFIG_SAM34_RTT)
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/* Using the RTT for subsecond ticks. */
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sam_rtt_enableclk();
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/* Disable ints, set prescaler, start counter */
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putreg32(RTT_MR_RTPRES(32768/CONFIG_RTC_FREQUENCY) | RTT_MR_RTTRST, SAM_RTT_MR);
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/* wait for a second tick to get the RTT offset.
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* Interrupts are assumed to still be off at this point.
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*/
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rtc_sync();
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/* Probably safe to read the RTT_VR register now since the clock just ticked,
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* but we'll be careful anyway.
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*/
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do
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{
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g_rtt_offset = getreg32(SAM_RTT_VR);
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}
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while(getreg32(SAM_RTT_VR) != g_rtt_offset);
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#endif
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rtc_dumpregs("After Initialization");
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return OK;
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}
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@@ -681,4 +752,55 @@ int up_rtc_setalarm(FAR const struct timespec *tp, alarmcb_t callback)
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}
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#endif
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/************************************************************************************
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* Name: up_rtc_gettime
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*
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* Description:
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* Get the current time from the high resolution RTC clock/counter. This interface
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* is only supported by the high-resolution RTC/counter hardware implementation.
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* It is used to replace the system timer.
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*
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* Input Parameters:
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* tp - The location to return the high resolution time value.
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno on failure
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*
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************************************************************************************/
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#if defined(CONFIG_RTC_HIRES) && defined (CONFIG_SAM34_RTT)
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int up_rtc_gettime(FAR struct timespec *tp)
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{
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/* This is a hack to emulate a high resolution rtc using the rtt */
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uint32_t rtc_cal, rtc_tim, rtt_val;
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struct tm t;
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do
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{
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rtc_cal = getreg32(SAM_RTC_CALR);
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rtc_tim = getreg32(SAM_RTC_TIMR);
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rtt_val = getreg32(SAM_RTT_VR);
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} while((rtc_cal != getreg32(SAM_RTC_CALR)) ||
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(rtc_tim != getreg32(SAM_RTC_TIMR)) ||
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(rtt_val != getreg32(SAM_RTT_VR)));
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t.tm_sec = rtc_bcd2bin((rtc_tim & RTC_TIMR_SEC_MASK) >> RTC_TIMR_SEC_SHIFT);
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t.tm_min = rtc_bcd2bin((rtc_tim & RTC_TIMR_MIN_MASK) >> RTC_TIMR_MIN_SHIFT);
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t.tm_hour = rtc_bcd2bin((rtc_tim & RTC_TIMR_HOUR_MASK) >> RTC_TIMR_HOUR_SHIFT);
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t.tm_mday = rtc_bcd2bin((rtc_cal & RTC_CALR_DATE_MASK) >> RTC_CALR_DATE_SHIFT);
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t.tm_mon = rtc_bcd2bin((rtc_cal & RTC_CALR_MONTH_MASK) >> RTC_CALR_MONTH_SHIFT);
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t.tm_year = (rtc_bcd2bin((rtc_cal & RTC_CALR_CENT_MASK) >> RTC_CALR_CENT_SHIFT) * 100)
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+ rtc_bcd2bin((rtc_cal & RTC_CALR_YEAR_MASK) >> RTC_CALR_YEAR_SHIFT)
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- 1900;
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tp->tv_sec = mktime(&t);
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tp->tv_nsec = (((rtt_val-g_rtt_offset) & (CONFIG_RTC_FREQUENCY-1)) * 1000000000ULL) /
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CONFIG_RTC_FREQUENCY;
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return OK;
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}
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#endif
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#endif /* CONFIG_RTC */
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File diff suppressed because it is too large
Load Diff
@@ -0,0 +1,100 @@
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/****************************************************************************
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* arch/arm/src/sam34/sam_rtt.h
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Authors: Gregory Nutt <gnutt@nuttx.org>
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* Bob Doiron
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __ARCH_ARM_SRC_SAM34_RTT_H
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#define __ARCH_ARM_SRC_SAM34_RTT_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include "chip.h"
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#include "chip/sam_rtt.h"
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#ifdef CONFIG_TIMER
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef __ASSEMBLY__
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#undef EXTERN
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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#if defined(CONFIG_SAM34_RTT)
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/****************************************************************************
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* Name: sam_rttinitialize
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*
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* Description:
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* Initialize the timer. The timer is initialized and registers as
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* 'devpath. The initial state of the timer is disabled.
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*
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* Input Parameters:
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* devpath - The full path to the timer. This should be of the form
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* /dev/rtt0
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*
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* Returned Values:
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* None
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*
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****************************************************************************/
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void sam_rttinitialize(FAR const char *devpath);
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#endif // CONFIG_SAM34_RTT
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_TIMER */
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#endif /* __ARCH_ARM_SRC_SAM34_RTT_H */
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+23
-24
@@ -106,7 +106,6 @@ struct sam34_lowerhalf_s
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uint32_t clkticks; /* actual clock ticks for current interval */
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bool started; /* The timer has been started */
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uint16_t periphid; /* peripheral id */
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uint16_t debug;
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};
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/****************************************************************************
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@@ -134,7 +133,7 @@ static int sam34_getstatus(FAR struct timer_lowerhalf_s *lower,
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FAR struct timer_status_s *status);
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static int sam34_settimeout(FAR struct timer_lowerhalf_s *lower,
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uint32_t timeout);
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static tccb_t sam34_capture(FAR struct timer_lowerhalf_s *lower,
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static tccb_t sam34_sethandler(FAR struct timer_lowerhalf_s *lower,
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tccb_t handler);
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static int sam34_ioctl(FAR struct timer_lowerhalf_s *lower, int cmd,
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unsigned long arg);
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@@ -150,7 +149,7 @@ static const struct timer_ops_s g_tcops =
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.stop = sam34_stop,
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.getstatus = sam34_getstatus,
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.settimeout = sam34_settimeout,
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.capture = sam34_capture,
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.sethandler = sam34_sethandler,
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.ioctl = sam34_ioctl,
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};
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@@ -267,15 +266,13 @@ static void sam34_putreg(uint32_t val, uint32_t addr)
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static int sam34_interrupt(int irq, FAR void *context)
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{
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FAR struct sam34_lowerhalf_s *priv = &g_tcdevs[irq-SAM_IRQ_TC0];
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uint16_t regval;
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tcvdbg("Entry\n");
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DEBUGASSERT((irq >= SAM_IRQ_TC0) && (irq <= SAM_IRQ_TC5));
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/* Check if the interrupt is really pending */
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regval = sam34_getreg(priv->base + SAM_TC_SR_OFFSET);
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if ((regval & TC_INT_CPCS) != 0)
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if ((sam34_getreg(priv->base + SAM_TC_SR_OFFSET) & TC_INT_CPCS) != 0)
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{
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uint32_t timeout;
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@@ -283,7 +280,7 @@ static int sam34_interrupt(int irq, FAR void *context)
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if (priv->handler && priv->handler(&priv->timeout))
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{
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/* Calculate new ticks */
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/* Calculate new ticks / dither adjustment */
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priv->clkticks = ((uint64_t)(priv->adjustment + priv->timeout))*TC_FCLK / 1000000;
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@@ -323,7 +320,7 @@ static int sam34_interrupt(int irq, FAR void *context)
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static int sam34_start(FAR struct timer_lowerhalf_s *lower)
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{
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FAR struct sam34_lowerhalf_s *priv = (FAR struct sam34_lowerhalf_s *)lower;
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uint32_t mr_val = 0;
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uint32_t mr_val;
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tcvdbg("Entry\n");
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DEBUGASSERT(priv);
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@@ -335,13 +332,14 @@ static int sam34_start(FAR struct timer_lowerhalf_s *lower)
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sam_enableperiph0(priv->periphid); /* Enable peripheral clock */
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sam34_putreg(TC_CCR_CLKDIS, priv->base + SAM_TC_CCR_OFFSET); /* Disable counter */
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sam34_putreg(0, priv->base + SAM_TC_CV_OFFSET); /* clear counter */
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/* TC_CMR_WAVE - waveform mode
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* TC_CMR_WAVSEL_UPAUTO - reset on RC compare (interval timer)
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* TC_CMR_TCCLKS_TIMERCLOCK5 = SCLK
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*/
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mr_val |= (TC_CMR_WAVE + TC_CMR_WAVSEL_UPAUTO + TC_CMR_TCCLKS_TIMERCLOCK5);
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mr_val = (TC_CMR_WAVE + TC_CMR_WAVSEL_UPAUTO + TC_CMR_TCCLKS_TIMERCLOCK5);
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sam34_putreg(mr_val, priv->base + SAM_TC_CMR_OFFSET);
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sam34_putreg(priv->clkticks, priv->base + SAM_TC_RC_OFFSET); /* Set interval */
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@@ -381,7 +379,7 @@ static int sam34_stop(FAR struct timer_lowerhalf_s *lower)
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tcvdbg("Entry\n");
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DEBUGASSERT(priv);
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if(!priv->started)
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if (!priv->started)
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{
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return -EINVAL;
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}
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@@ -430,7 +428,7 @@ static int sam34_getstatus(FAR struct timer_lowerhalf_s *lower,
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if (priv->handler)
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{
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status->flags |= TCFLAGS_CAPTURE;
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status->flags |= TCFLAGS_HANDLER;
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}
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/* Return the actual timeout is milliseconds */
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@@ -440,7 +438,7 @@ static int sam34_getstatus(FAR struct timer_lowerhalf_s *lower,
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/* Get the time remaining until the timer expires (in microseconds) */
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elapsed = sam34_getreg(priv->base + SAM_TC_CV_OFFSET);
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status->timeleft = (priv->timeout * elapsed) / (priv->clkticks + 1); /* TODO - check on this +1 */
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status->timeleft = ((uint64_t)priv->timeout * elapsed) / (priv->clkticks + 1); /* TODO - check on this +1 */
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tcvdbg(" flags : %08x\n", status->flags);
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tcvdbg(" timeout : %d\n", status->timeout);
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@@ -470,6 +468,12 @@ static int sam34_settimeout(FAR struct timer_lowerhalf_s *lower,
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FAR struct sam34_lowerhalf_s *priv = (FAR struct sam34_lowerhalf_s *)lower;
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DEBUGASSERT(priv);
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if (priv->started)
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{
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return -EPERM;
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}
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tcvdbg("Entry: timeout=%d\n", timeout);
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/* Can this timeout be represented? */
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@@ -486,21 +490,17 @@ static int sam34_settimeout(FAR struct timer_lowerhalf_s *lower,
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timeout = (1000000ULL * priv->clkticks) / TC_FCLK; /* Truncated timeout */
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priv->adjustment = priv->timeout - timeout; /* Truncated time to be added to next interval (dither) */
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tcvdbg("fwdt=%d reload=%d timout=%d, adjustment=%d\n",
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TC_FCLK, reload, priv->timeout, priv->adjustment);
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/* Don't commit to MR register until started! */
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tcvdbg("fclk=%d clkticks=%d timout=%d, adjustment=%d\n",
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TC_FCLK, priv->clkticks, priv->timeout, priv->adjustment);
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return OK;
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}
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/****************************************************************************
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* Name: sam34_capture
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* Name: sam34_sethandler
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*
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* Description:
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* Don't reset on timer timeout; instead, call this user provider
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* timeout handler. NOTE: Providing handler==NULL will restore the reset
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* behavior.
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* Call this user provided timeout handler.
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*
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* Input Parameters:
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* lower - A pointer the publicly visible representation of the "lower-half"
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@@ -511,13 +511,12 @@ static int sam34_settimeout(FAR struct timer_lowerhalf_s *lower,
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*
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* Returned Values:
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* The previous timer expiration function pointer or NULL is there was
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* no previous function pointer, i.e., if the previous behavior was
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* reset-on-expiration (NULL is also returned if an error occurs).
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* no previous function pointer.
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*
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****************************************************************************/
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static tccb_t sam34_capture(FAR struct timer_lowerhalf_s *lower,
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tccb_t handler)
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static tccb_t sam34_sethandler(FAR struct timer_lowerhalf_s *lower,
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tccb_t handler)
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{
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FAR struct sam34_lowerhalf_s *priv = (FAR struct sam34_lowerhalf_s *)lower;
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irqstate_t flags;
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