91 lines
2.6 KiB
C
91 lines
2.6 KiB
C
/****************************************************************************
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* arch/arm/src/am335x/am335x_pinmux.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <sys/types.h>
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#include <stdint.h>
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#include <assert.h>
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#include <errno.h>
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#include "arm_internal.h"
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#include "am335x_pinmux.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: am335x_pinmux_configure
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*
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* Description:
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* This function writes the encoded pad configuration to the Pad Control
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* register.
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*
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****************************************************************************/
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int am335x_pinmux_configure(uintptr_t padctl, pinmux_pinset_t muxset)
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{
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uint32_t regval = 0;
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uint32_t value;
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/* Select mux mode */
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value = (muxset & PINMUX_MODE_MASK) >> PINMUX_MODE_SHIFT;
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regval |= PADCTL_MUXMODE(value);
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/* Select pull up/down type */
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if ((muxset & PINMUX_PULL_TYPE_UP) != 0)
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{
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regval |= PADCTL_PULLUP_EN;
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}
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/* Select pull up/down enable */
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if ((muxset & PINMUX_PULL_UP_DISABLE) != 0)
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{
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regval |= PADCTL_PULLUDDIS;
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}
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/* Select receive enable */
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if ((muxset & PINMUX_RX_ENABLE) != 0)
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{
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regval |= PADCTL_RXACTIVE;
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}
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/* Select slow/fast slew rate */
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if ((muxset & PINMUX_SLEW_SLOW) != 0)
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{
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regval |= PADCTL_SLEWCTRL;
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}
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/* Write the result to the specified Pad Control register */
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putreg32(regval, padctl);
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return OK;
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}
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