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arch/xmc4 Add tickless support

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This commit is contained in:
Nicolas Lemblé
2024-02-21 15:01:38 +01:00
committed by Alan Carvalho de Assis
parent be482cd830
commit 63782c7ff2
5 changed files with 837 additions and 0 deletions
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arch/arm/Kconfig
+1
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@@ -600,6 +600,7 @@ config ARCH_CHIP_XMC4
select ARCH_HAVE_I2CRESET
select ARM_HAVE_MPU_UNIFIED
select ARMV7M_HAVE_STACKCHECK
select ARCH_HAVE_TICKLESS
---help---
Infineon XMC4xxx(ARM Cortex-M4) architectures
arch/arm/src/xmc4/Make.defs
+3
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@@ -25,6 +25,7 @@ include armv7-m/Make.defs
CHIP_CSRCS = xmc4_allocateheap.c xmc4_clockconfig.c xmc4_clockutils.c
CHIP_CSRCS += xmc4_clrpend.c xmc4_flash.c xmc4_gpio.c xmc4_irq.c
CHIP_CSRCS += xmc4_lowputc.c xmc4_serial.c xmc4_start.c xmc4_usic.c
CHIP_CSRCS += xmc4_ccu4.c
# Configuration-dependent Kinetis files
@@ -34,6 +35,8 @@ endif
ifneq ($(CONFIG_SCHED_TICKLESS),y)
CHIP_CSRCS += xmc4_timerisr.c
else
CHIP_CSRCS += xmc4_tickless.c
endif
ifeq ($(CONFIG_BUILD_PROTECTED),y)
arch/arm/src/xmc4/xmc4_ccu4.c
+195
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@@ -0,0 +1,195 @@
/****************************************************************************
* arch/arm/src/xmc4/xmc4_ccu4.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* XMC CCU Driver
*
* For now, this file contains only helper methods mandatory for xmc tickless
* feature. Contibutions are welcomed.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <arch/board/board.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include "arm_internal.h"
#include "hardware/xmc4_ccu4.h"
#include "xmc4_ccu4.h"
#define CCU4_NDIVIDERS 15
static const uint8_t g_log2divider[CCU4_NDIVIDERS] =
{
1, /* TIMER_CLOCK1 -> div2 */
2, /* TIMER_CLOCK1 -> div4 */
3, /* TIMER_CLOCK2 -> div8 */
4, /* TIMER_CLOCK2 -> div16 */
5, /* TIMER_CLOCK3 -> div32 */
6, /* TIMER_CLOCK3 -> div64 */
7, /* TIMER_CLOCK4 -> div128 */
8, /* TIMER_CLOCK4 -> div256 */
9, /* TIMER_CLOCK4 -> div512 */
10, /* TIMER_CLOCK4 -> div1024 */
11, /* TIMER_CLOCK4 -> div2048 */
12, /* TIMER_CLOCK4 -> div4096 */
13, /* TIMER_CLOCK4 -> div8192 */
14, /* TIMER_CLOCK4 -> div16384 */
15 /* TIMER_CLOCK4 -> div32769 */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: xmc4_ccu4_divfreq_lookup
*
* Description:
* Given the TC input frequency (Ftcin) and a divider index, return the
* value of the divided frequency
*
* Input Parameters:
* ftcin - TC input frequency
* ndx - Divider index
*
* Returned Value:
* The divided frequency value
*
****************************************************************************/
static uint32_t xmc4_ccu4_divfreq_lookup(uint32_t ftcin, int ndx)
{
return ftcin >> g_log2divider[ndx];
}
/****************************************************************************
* Name: xmc4_ccu4_freqdiv_lookup
*
* Description:
* Given the TC input frequency (Ftcin) and a divider index, return the
* value of the Ftcin divider.
*
* Input Parameters:
* ftcin - TC input frequency
* ndx - Divider index
*
* Returned Value:
* The Ftcin input divider value
*
****************************************************************************/
static int xmc4_ccu4_freqdiv_lookup(uint32_t ftcin, int ndx)
{
return 1 << g_log2divider[ndx];
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: xmc4_ccu4_divisor
*
* Description:
* Finds the best MCK divisor given the timer frequency and MCK. The
* result is guaranteed to satisfy the following equation:
*
* (Ftcin / (div * 65536)) <= freq <= (Ftcin / dev)
*
* where:
* freq - the desired frequency
* Ftcin - The timer/counter input frequency
* div - With DIV being the highest possible value.
*
* Input Parameters:
* frequency Desired timer frequency.
* div Divisor value.
* pssiv PSSIV field value for divisor.
*
* Returned Value:
* Zero (OK) if a proper divisor has been found, otherwise a negated errno
* value indicating the nature of the failure.
*
****************************************************************************/
int xmc4_ccu4_divisor(uint32_t frequency, uint32_t *div, uint32_t *pssiv)
{
uint32_t ftcin = BOARD_CCU_FREQUENCY;
int ndx = 0;
tmrinfo("frequency=%" PRIu32 "\n", frequency);
/* Satisfy lower bound. That is, the value of the divider such that:
*
* frequency >= (tc_input_frequency * 65536) / divider.
*/
while (frequency < (xmc4_ccu4_divfreq_lookup(ftcin, ndx) >> 16))
{
if (++ndx > CCU4_NDIVIDERS)
{
/* If no divisor can be found, return -ERANGE */
tmrerr("ERROR: Lower bound search failed\n");
return -ERANGE;
}
}
/* Try to maximize DIV while still satisfying upper bound. That the
* value of the divider such that:
*
* frequency < tc_input_frequency / divider.
*/
for (; ndx < (CCU4_NDIVIDERS - 1); ndx++)
{
if (frequency > xmc4_ccu4_divfreq_lookup(ftcin, ndx + 1))
{
break;
}
}
/* Return the divider value */
if (div)
{
uint32_t value = xmc4_ccu4_freqdiv_lookup(ftcin, ndx);
tmrinfo("return div=%lu\n", (unsigned long)value);
*div = value;
}
/* Return the PSSIV selection */
if (pssiv)
{
tmrinfo("return pssiv=%d\n", ndx + 1);
*pssiv = ndx + 1;
}
return OK;
}
arch/arm/src/xmc4/xmc4_ccu4.h
+64
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@@ -0,0 +1,64 @@
/****************************************************************************
* arch/arm/src/xmc4/xmc4_ccu4.h
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
#ifndef __ARCH_ARM_SRC_XMC4_XMC4_CCU4_H
#define __ARCH_ARM_SRC_XMC4_XMC4_CCU4_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
/****************************************************************************
* Public Functions Prototypes
****************************************************************************/
/****************************************************************************
* Name: xmc4_ccu4_divisor
*
* Description:
* Finds the best MCK divisor given the timer frequency and MCK. The
* result is guaranteed to satisfy the following equation:
*
* (Ftcin / (div * 65536)) <= freq <= (Ftcin / dev)
*
* where:
* freq - the desired frequency
* Ftcin - The timer/counter input frequency
* div - With DIV being the highest possible value.
*
* Input Parameters:
* frequency Desired timer frequency.
* div Divisor value.
* pssiv PSSIV field value for divisor.
*
* Returned Value:
* Zero (OK) if a proper divisor has been found, otherwise a negated errno
* value indicating the nature of the failure.
*
****************************************************************************/
int xmc4_ccu4_divisor(uint32_t frequency, uint32_t *div, uint32_t *pssiv);
#endif
arch/arm/src/xmc4/xmc4_tickless.c
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