2014-04-22 21:42:38 +02:00
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/****************************************************************************
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* arch/arm/src/sam34/sam_tc.c
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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 Dioron
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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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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/arch.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/timer.h>
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#include <arch/board/board.h>
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#include "up_arch.h"
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#include "sam_tc.h"
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#include "sam_periphclks.h"
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#if defined(CONFIG_TIMER) && (defined(CONFIG_SAM34_TC0) || \
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defined(CONFIG_SAM34_TC1) || defined(CONFIG_SAM34_TC2) || \
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defined(CONFIG_SAM34_TC3) || defined(CONFIG_SAM34_TC4) || \
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defined(CONFIG_SAM34_TC5))
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/****************************************************************************
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* Pre-Processor Definitions
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****************************************************************************/
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/* Clocking *****************************************************************/
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/* TODO: Allow selection of any of the input clocks */
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2014-09-08 14:14:59 +02:00
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#define TC_FCLK (BOARD_SCLK_FREQUENCY)
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2014-04-22 21:42:38 +02:00
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#define TC_MAXTIMEOUT ((1000000ULL * (1ULL + TC_RVALUE_MASK)) / TC_FCLK)
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/* Configuration ************************************************************/
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/* Debug ********************************************************************/
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/* Non-standard debug that may be enabled just for testing the timer
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* driver. NOTE: that only lldbg types are used so that the output is
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* immediately available.
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*/
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#ifdef CONFIG_DEBUG_TIMER
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# define tcdbg lldbg
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# define tcvdbg llvdbg
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#else
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# define tcdbg(x...)
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# define tcvdbg(x...)
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#endif
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* This structure provides the private representation of the "lower-half"
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* driver state structure. This structure must be cast-compatible with the
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* timer_lowerhalf_s structure.
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*/
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struct sam34_lowerhalf_s
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{
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FAR const struct timer_ops_s *ops; /* Lower half operations */
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2014-04-30 22:10:02 +02:00
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/* Private data */
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uint32_t base; /* Base address of the timer */
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tccb_t handler; /* Current user interrupt handler */
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uint32_t timeout; /* The current timeout value (us) */
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uint32_t adjustment; /* time lost due to clock resolution truncation (us) */
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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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2014-04-30 22:46:26 +02:00
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uint16_t periphid; /* peripheral id */
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2014-04-22 21:42:38 +02:00
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* Register operations ******************************************************/
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#if defined(CONFIG_SAM34_TC_REGDEBUG) && defined(CONFIG_DEBUG)
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static uint32_t sam34_getreg(uint32_t addr);
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static void sam34_putreg(uint32_t val, uint32_t addr);
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#else
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# define sam34_getreg(addr) getreg32(addr)
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# define sam34_putreg(val,addr) putreg32(val,addr)
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#endif
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2014-04-30 22:10:02 +02:00
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/* Interrupt handling *******************************************************/
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2014-04-22 21:42:38 +02:00
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static int sam34_interrupt(int irq, FAR void *context);
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/* "Lower half" driver methods **********************************************/
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static int sam34_start(FAR struct timer_lowerhalf_s *lower);
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static int sam34_stop(FAR struct timer_lowerhalf_s *lower);
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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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2014-05-05 22:35:37 +02:00
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static tccb_t sam34_sethandler(FAR struct timer_lowerhalf_s *lower,
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2014-04-30 22:10:02 +02:00
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tccb_t handler);
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2014-04-22 21:42:38 +02:00
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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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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* "Lower half" driver methods */
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static const struct timer_ops_s g_tcops =
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{
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.start = sam34_start,
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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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2014-05-05 22:35:37 +02:00
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.sethandler = sam34_sethandler,
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2014-04-22 21:42:38 +02:00
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.ioctl = sam34_ioctl,
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};
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/* "Lower half" driver state */
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2014-04-30 22:46:26 +02:00
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/* TODO - allocating all 6 now, even though we might not need them.
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* May want to allocate the right number to not be wasteful.
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*/
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static struct sam34_lowerhalf_s g_tcdevs[6];
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2014-04-22 21:42:38 +02:00
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: sam34_getreg
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*
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* Description:
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* Get the contents of a register
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*
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****************************************************************************/
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#if defined(CONFIG_SAM34_TC_REGDEBUG) && defined(CONFIG_DEBUG)
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static uint32_t sam34_getreg(uint32_t addr)
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{
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static uint32_t prevaddr = 0;
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static uint32_t count = 0;
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static uint32_t preval = 0;
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/* Read the value from the register */
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uint32_t val = getreg32(addr);
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/* Is this the same value that we read from the same registe last time? Are
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* we polling the register? If so, suppress some of the output.
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*/
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if (addr == prevaddr && val == preval)
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{
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if (count == 0xffffffff || ++count > 3)
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{
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if (count == 4)
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{
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lldbg("...\n");
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}
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return val;
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}
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}
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/* No this is a new address or value */
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else
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{
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/* Did we print "..." for the previous value? */
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if (count > 3)
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{
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/* Yes.. then show how many times the value repeated */
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lldbg("[repeats %d more times]\n", count-3);
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}
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/* Save the new address, value, and count */
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prevaddr = addr;
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preval = val;
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count = 1;
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}
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/* Show the register value read */
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lldbg("%08lx->%08lx\n", addr, val);
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return val;
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}
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#endif
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/****************************************************************************
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* Name: sam34_putreg
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*
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* Description:
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* Set the contents of an SAM34 register to a value
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*
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****************************************************************************/
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#if defined(CONFIG_SAM34_TC_REGDEBUG) && defined(CONFIG_DEBUG)
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static void sam34_putreg(uint32_t val, uint32_t addr)
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{
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/* Show the register value being written */
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lldbg("%08lx<-%08lx\n", addr, val);
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/* Write the value */
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putreg32(val, addr);
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}
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#endif
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/****************************************************************************
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* Name: sam34_interrupt
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*
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* Description:
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* TC interrupt
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*
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* Input Parameters:
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* Usual interrupt handler arguments.
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*
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* Returned Values:
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* Always returns OK.
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*
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****************************************************************************/
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static int sam34_interrupt(int irq, FAR void *context)
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{
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2014-04-30 22:46:26 +02:00
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FAR struct sam34_lowerhalf_s *priv = &g_tcdevs[irq-SAM_IRQ_TC0];
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2014-04-22 21:42:38 +02:00
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tcvdbg("Entry\n");
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2014-04-30 22:46:26 +02:00
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DEBUGASSERT((irq >= SAM_IRQ_TC0) && (irq <= SAM_IRQ_TC5));
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2014-04-22 21:42:38 +02:00
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/* Check if the interrupt is really pending */
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2014-05-05 22:35:37 +02:00
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if ((sam34_getreg(priv->base + SAM_TC_SR_OFFSET) & TC_INT_CPCS) != 0)
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2014-04-22 21:42:38 +02:00
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{
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2014-04-30 22:10:02 +02:00
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uint32_t timeout;
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2015-01-13 22:55:54 +01:00
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/* Is there a registered handler? If the handler has been nullified,
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* the timer will be stopped.
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*/
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2014-04-22 21:42:38 +02:00
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2014-04-30 22:10:02 +02:00
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if (priv->handler && priv->handler(&priv->timeout))
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{
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2014-05-05 22:35:37 +02:00
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/* Calculate new ticks / dither adjustment */
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2014-04-30 22:10:02 +02:00
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priv->clkticks = ((uint64_t)(priv->adjustment + priv->timeout))*TC_FCLK / 1000000;
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/* Set next interval interval. TODO: make sure the interval is not so soon it will be missed! */
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2014-04-30 22:46:26 +02:00
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sam34_putreg(priv->clkticks, priv->base + SAM_TC_RC_OFFSET);
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2014-04-30 22:10:02 +02:00
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timeout = (1000000ULL * priv->clkticks) / TC_FCLK; /* trucated timeout */
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priv->adjustment = (priv->adjustment + priv->timeout) - timeout; /* truncated time to be added to next interval (dither) */
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}
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2015-01-13 22:55:54 +01:00
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else
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2014-04-30 22:10:02 +02:00
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{
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2015-01-13 22:55:54 +01:00
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/* No handler or the handler returned false.. stop the timer */
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2014-04-30 22:46:26 +02:00
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sam34_stop((FAR struct timer_lowerhalf_s *)priv);
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2015-01-13 22:55:54 +01:00
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tcvdbg("Stopped\n");
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2014-04-30 22:10:02 +02:00
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}
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2014-04-22 21:42:38 +02:00
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2014-04-30 22:46:26 +02:00
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/* TC_INT_CPCS is cleared by reading SAM_TCx_SR */
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2014-04-22 21:42:38 +02:00
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}
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return OK;
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}
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/****************************************************************************
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* Name: sam34_start
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*
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* Description:
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* Start the timer, resetting the time to the current timeout,
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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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* driver state structure.
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*
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* Returned Values:
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* Zero on success; a negated errno value on failure.
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*
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****************************************************************************/
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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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2014-05-05 22:35:37 +02:00
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uint32_t mr_val;
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2014-04-22 21:42:38 +02:00
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tcvdbg("Entry\n");
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DEBUGASSERT(priv);
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2014-04-30 22:46:26 +02:00
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if (priv->started)
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2014-04-30 22:10:02 +02:00
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{
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return -EINVAL;
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}
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2014-04-30 22:46:26 +02:00
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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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2014-05-05 22:35:37 +02:00
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sam34_putreg(0, priv->base + SAM_TC_CV_OFFSET); /* clear counter */
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2014-04-22 21:42:38 +02:00
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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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2014-05-05 22:35:37 +02:00
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mr_val = (TC_CMR_WAVE + TC_CMR_WAVSEL_UPAUTO + TC_CMR_TCCLKS_TIMERCLOCK5);
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2014-04-30 22:46:26 +02:00
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sam34_putreg(mr_val, priv->base + SAM_TC_CMR_OFFSET);
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2014-04-22 21:42:38 +02:00
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2014-04-30 22:46:26 +02:00
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sam34_putreg(priv->clkticks, priv->base + SAM_TC_RC_OFFSET); /* Set interval */
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2014-04-22 21:42:38 +02:00
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2014-04-30 22:10:02 +02:00
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if (priv->handler)
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2014-04-22 21:42:38 +02:00
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{
|
2014-04-30 22:10:02 +02:00
|
|
|
/* Clear status and enable interrupt */
|
2014-04-22 21:42:38 +02:00
|
|
|
|
2014-04-30 22:46:26 +02:00
|
|
|
sam34_getreg(priv->base + SAM_TC_SR_OFFSET); /* Clear status */
|
|
|
|
sam34_putreg(TC_INT_CPCS, priv->base + SAM_TC_IER_OFFSET); /* Enable interrupt */
|
2014-04-22 21:42:38 +02:00
|
|
|
}
|
|
|
|
|
2014-04-30 22:46:26 +02:00
|
|
|
sam34_putreg(TC_CCR_SWTRG + TC_CCR_CLKEN, priv->base + SAM_TC_CCR_OFFSET); /* Start counter */
|
2014-04-22 21:42:38 +02:00
|
|
|
|
|
|
|
priv->started = true;
|
|
|
|
return OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: sam34_stop
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Stop the timer
|
|
|
|
*
|
|
|
|
* Input Parameters:
|
|
|
|
* lower - A pointer the publicly visible representation of the "lower-half"
|
|
|
|
* driver state structure.
|
|
|
|
*
|
|
|
|
* Returned Values:
|
|
|
|
* Zero on success; a negated errno value on failure.
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
static int sam34_stop(FAR struct timer_lowerhalf_s *lower)
|
|
|
|
{
|
2014-04-30 22:10:02 +02:00
|
|
|
FAR struct sam34_lowerhalf_s *priv = (FAR struct sam34_lowerhalf_s *)lower;
|
2014-04-22 21:42:38 +02:00
|
|
|
tcvdbg("Entry\n");
|
2014-04-30 22:10:02 +02:00
|
|
|
DEBUGASSERT(priv);
|
|
|
|
|
2014-05-05 22:35:37 +02:00
|
|
|
if (!priv->started)
|
2014-04-30 22:10:02 +02:00
|
|
|
{
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2014-04-30 22:46:26 +02:00
|
|
|
sam34_putreg(TC_CCR_CLKDIS, priv->base + SAM_TC_CCR_OFFSET); /* Disable counter */
|
|
|
|
sam34_putreg(TC_INT_ALL, priv->base + SAM_TC_IDR_OFFSET); /* Disable all ints */
|
|
|
|
sam_disableperiph0(priv->periphid); /* Disable peripheral clock */
|
|
|
|
|
2014-04-30 22:10:02 +02:00
|
|
|
priv->started = false;
|
2014-04-22 21:42:38 +02:00
|
|
|
|
|
|
|
return OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: sam34_getstatus
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Get the current timer status
|
|
|
|
*
|
|
|
|
* Input Parameters:
|
2014-04-30 22:10:02 +02:00
|
|
|
* lower - A pointer the publicly visible representation of the "lower-half"
|
|
|
|
* driver state structure.
|
|
|
|
* status - The location to return the status information.
|
2014-04-22 21:42:38 +02:00
|
|
|
*
|
|
|
|
* Returned Values:
|
|
|
|
* Zero on success; a negated errno value on failure.
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
static int sam34_getstatus(FAR struct timer_lowerhalf_s *lower,
|
|
|
|
FAR struct timer_status_s *status)
|
|
|
|
{
|
|
|
|
FAR struct sam34_lowerhalf_s *priv = (FAR struct sam34_lowerhalf_s *)lower;
|
|
|
|
uint32_t elapsed;
|
|
|
|
|
|
|
|
tcvdbg("Entry\n");
|
|
|
|
DEBUGASSERT(priv);
|
|
|
|
|
|
|
|
/* Return the status bit */
|
|
|
|
|
|
|
|
status->flags = 0;
|
|
|
|
if (priv->started)
|
|
|
|
{
|
|
|
|
status->flags |= TCFLAGS_ACTIVE;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (priv->handler)
|
|
|
|
{
|
2014-05-05 22:35:37 +02:00
|
|
|
status->flags |= TCFLAGS_HANDLER;
|
2014-04-22 21:42:38 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Return the actual timeout is milliseconds */
|
|
|
|
|
|
|
|
status->timeout = priv->timeout;
|
|
|
|
|
|
|
|
/* Get the time remaining until the timer expires (in microseconds) */
|
|
|
|
|
2014-04-30 22:46:26 +02:00
|
|
|
elapsed = sam34_getreg(priv->base + SAM_TC_CV_OFFSET);
|
2014-05-05 22:35:37 +02:00
|
|
|
status->timeleft = ((uint64_t)priv->timeout * elapsed) / (priv->clkticks + 1); /* TODO - check on this +1 */
|
2014-04-22 21:42:38 +02:00
|
|
|
|
|
|
|
tcvdbg(" flags : %08x\n", status->flags);
|
|
|
|
tcvdbg(" timeout : %d\n", status->timeout);
|
|
|
|
tcvdbg(" timeleft : %d\n", status->timeleft);
|
|
|
|
return OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: sam34_settimeout
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Set a new timeout value (and reset the timer)
|
|
|
|
*
|
|
|
|
* Input Parameters:
|
|
|
|
* lower - A pointer the publicly visible representation of the "lower-half"
|
|
|
|
* driver state structure.
|
2014-04-30 22:10:02 +02:00
|
|
|
* timeout - The new timeout value in milliseconds.
|
2014-04-22 21:42:38 +02:00
|
|
|
*
|
|
|
|
* Returned Values:
|
|
|
|
* Zero on success; a negated errno value on failure.
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
static int sam34_settimeout(FAR struct timer_lowerhalf_s *lower,
|
|
|
|
uint32_t timeout)
|
|
|
|
{
|
|
|
|
FAR struct sam34_lowerhalf_s *priv = (FAR struct sam34_lowerhalf_s *)lower;
|
|
|
|
|
|
|
|
DEBUGASSERT(priv);
|
2014-05-05 22:35:37 +02:00
|
|
|
|
|
|
|
if (priv->started)
|
|
|
|
{
|
|
|
|
return -EPERM;
|
|
|
|
}
|
|
|
|
|
2014-04-22 21:42:38 +02:00
|
|
|
tcvdbg("Entry: timeout=%d\n", timeout);
|
|
|
|
|
|
|
|
/* Can this timeout be represented? */
|
|
|
|
|
|
|
|
if (timeout < 1 || timeout > TC_MAXTIMEOUT)
|
|
|
|
{
|
|
|
|
tcdbg("Cannot represent timeout=%lu > %lu\n",
|
|
|
|
timeout, TC_MAXTIMEOUT);
|
|
|
|
return -ERANGE;
|
|
|
|
}
|
|
|
|
|
2014-04-30 22:10:02 +02:00
|
|
|
priv->timeout = timeout; /* Intended timeout */
|
|
|
|
priv->clkticks = (((uint64_t)timeout * TC_FCLK) / 1000000); /* Actual clock ticks */
|
|
|
|
timeout = (1000000ULL * priv->clkticks) / TC_FCLK; /* Truncated timeout */
|
|
|
|
priv->adjustment = priv->timeout - timeout; /* Truncated time to be added to next interval (dither) */
|
2014-04-22 21:42:38 +02:00
|
|
|
|
2014-05-05 22:35:37 +02:00
|
|
|
tcvdbg("fclk=%d clkticks=%d timout=%d, adjustment=%d\n",
|
|
|
|
TC_FCLK, priv->clkticks, priv->timeout, priv->adjustment);
|
2014-04-22 21:42:38 +02:00
|
|
|
|
|
|
|
return OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
2014-05-05 22:35:37 +02:00
|
|
|
* Name: sam34_sethandler
|
2014-04-22 21:42:38 +02:00
|
|
|
*
|
|
|
|
* Description:
|
2014-05-05 22:35:37 +02:00
|
|
|
* Call this user provided timeout handler.
|
2014-04-22 21:42:38 +02:00
|
|
|
*
|
|
|
|
* Input Parameters:
|
|
|
|
* lower - A pointer the publicly visible representation of the "lower-half"
|
|
|
|
* driver state structure.
|
|
|
|
* newhandler - The new timer expiration function pointer. If this
|
|
|
|
* function pointer is NULL, then the reset-on-expiration
|
|
|
|
* behavior is restored,
|
|
|
|
*
|
|
|
|
* Returned Values:
|
|
|
|
* The previous timer expiration function pointer or NULL is there was
|
2014-05-05 22:35:37 +02:00
|
|
|
* no previous function pointer.
|
2014-04-22 21:42:38 +02:00
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
2014-05-05 22:35:37 +02:00
|
|
|
static tccb_t sam34_sethandler(FAR struct timer_lowerhalf_s *lower,
|
|
|
|
tccb_t handler)
|
2014-04-22 21:42:38 +02:00
|
|
|
{
|
|
|
|
FAR struct sam34_lowerhalf_s *priv = (FAR struct sam34_lowerhalf_s *)lower;
|
|
|
|
irqstate_t flags;
|
2014-04-30 22:10:02 +02:00
|
|
|
tccb_t oldhandler;
|
|
|
|
|
|
|
|
flags = irqsave();
|
2014-04-22 21:42:38 +02:00
|
|
|
|
|
|
|
DEBUGASSERT(priv);
|
|
|
|
tcvdbg("Entry: handler=%p\n", handler);
|
|
|
|
|
|
|
|
/* Get the old handler return value */
|
2014-04-30 22:10:02 +02:00
|
|
|
|
2014-04-22 21:42:38 +02:00
|
|
|
oldhandler = priv->handler;
|
|
|
|
|
|
|
|
/* Save the new handler */
|
|
|
|
|
|
|
|
priv->handler = handler;
|
|
|
|
|
|
|
|
irqrestore(flags);
|
|
|
|
return oldhandler;
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: sam34_ioctl
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Any ioctl commands that are not recognized by the "upper-half" driver
|
|
|
|
* are forwarded to the lower half driver through this method.
|
|
|
|
*
|
|
|
|
* Input Parameters:
|
|
|
|
* lower - A pointer the publicly visible representation of the "lower-half"
|
|
|
|
* driver state structure.
|
2014-04-30 22:10:02 +02:00
|
|
|
* cmd - The ioctl command value
|
2014-04-22 21:42:38 +02:00
|
|
|
* arg - The optional argument that accompanies the 'cmd'. The
|
|
|
|
* interpretation of this argument depends on the particular
|
|
|
|
* command.
|
|
|
|
*
|
|
|
|
* Returned Values:
|
|
|
|
* Zero on success; a negated errno value on failure.
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
static int sam34_ioctl(FAR struct timer_lowerhalf_s *lower, int cmd,
|
|
|
|
unsigned long arg)
|
|
|
|
{
|
|
|
|
FAR struct sam34_lowerhalf_s *priv = (FAR struct sam34_lowerhalf_s *)lower;
|
|
|
|
int ret = -ENOTTY;
|
|
|
|
|
|
|
|
DEBUGASSERT(priv);
|
|
|
|
tcvdbg("Entry: cmd=%d arg=%ld\n", cmd, arg);
|
2015-02-25 15:05:35 +01:00
|
|
|
UNUSED(priv);
|
2014-04-22 21:42:38 +02:00
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Public Functions
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: sam_tcinitialize
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Initialize the timer. The timer is initialized and
|
|
|
|
* registers as 'devpath'.
|
|
|
|
*
|
|
|
|
* Input Parameters:
|
|
|
|
* devpath - The full path to the timer. This should be of the form
|
|
|
|
* /dev/tc0
|
|
|
|
*
|
|
|
|
* Returned Values:
|
|
|
|
* None
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
void sam_tcinitialize(FAR const char *devpath, int irq)
|
|
|
|
{
|
2014-04-30 22:46:26 +02:00
|
|
|
FAR struct sam34_lowerhalf_s *priv = &g_tcdevs[irq-SAM_IRQ_TC0];
|
2014-04-22 21:42:38 +02:00
|
|
|
|
|
|
|
tcvdbg("Entry: devpath=%s\n", devpath);
|
2014-04-30 22:46:26 +02:00
|
|
|
DEBUGASSERT((irq >= SAM_IRQ_TC0) && (irq <= SAM_IRQ_TC5));
|
2014-04-22 21:42:38 +02:00
|
|
|
|
|
|
|
/* Initialize the driver state structure. Here we assume: (1) the state
|
|
|
|
* structure lies in .bss and was zeroed at reset time. (2) This function
|
|
|
|
* is only called once so it is never necessary to re-zero the structure.
|
|
|
|
*/
|
|
|
|
|
2014-04-30 22:46:26 +02:00
|
|
|
switch(irq)
|
|
|
|
{
|
|
|
|
#if defined(CONFIG_SAM34_TC0)
|
|
|
|
case SAM_IRQ_TC0:
|
|
|
|
priv->base = SAM_TC0_BASE;
|
|
|
|
priv->periphid = SAM_PID_TC0;
|
|
|
|
break;
|
|
|
|
#endif
|
2014-04-22 21:42:38 +02:00
|
|
|
|
2014-04-30 22:46:26 +02:00
|
|
|
#if defined(CONFIG_SAM34_TC1)
|
|
|
|
case SAM_IRQ_TC1:
|
|
|
|
priv->base = SAM_TC1_BASE;
|
|
|
|
priv->periphid = SAM_PID_TC1;
|
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#if defined(CONFIG_SAM34_TC2)
|
|
|
|
case SAM_IRQ_TC2:
|
|
|
|
priv->base = SAM_TC2_BASE;
|
|
|
|
priv->periphid = SAM_PID_TC2;
|
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#if defined(CONFIG_SAM34_TC3)
|
|
|
|
case SAM_IRQ_TC3:
|
|
|
|
priv->base = SAM_TC3_BASE;
|
|
|
|
priv->periphid = SAM_PID_TC3;
|
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#if defined(CONFIG_SAM34_TC4)
|
|
|
|
case SAM_IRQ_TC4:
|
|
|
|
priv->base = SAM_TC4_BASE;
|
|
|
|
priv->periphid = SAM_PID_TC4;
|
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#if defined(CONFIG_SAM34_TC5)
|
|
|
|
case SAM_IRQ_TC5:
|
|
|
|
priv->base = SAM_TC5_BASE;
|
|
|
|
priv->periphid = SAM_PID_TC5;
|
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
default:
|
|
|
|
ASSERT(0);
|
|
|
|
}
|
|
|
|
|
|
|
|
priv->ops = &g_tcops;
|
2014-04-22 21:42:38 +02:00
|
|
|
|
|
|
|
(void)irq_attach(irq, sam34_interrupt);
|
|
|
|
|
2014-04-30 22:46:26 +02:00
|
|
|
/* Enable NVIC interrupt. */
|
2014-04-22 21:42:38 +02:00
|
|
|
|
|
|
|
up_enable_irq(irq);
|
|
|
|
|
|
|
|
/* Register the timer driver as /dev/timerX */
|
|
|
|
|
|
|
|
(void)timer_register(devpath, (FAR struct timer_lowerhalf_s *)priv);
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif /* CONFIG_TIMER && CONFIG_SAM34_TCx */
|