260 lines
7.2 KiB
C
260 lines
7.2 KiB
C
/*
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* Copyright (c) 2013, Texas Instruments Incorporated - http://www.ti.com/
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* All rights reserved.
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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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* 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 the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software 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 HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \addtogroup cc2538-udma
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* @{
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*
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* \file
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* Implementation of the cc2538 micro-DMA driver
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*/
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#include "contiki-conf.h"
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#include "dev/udma.h"
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#include "dev/nvic.h"
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#include "reg.h"
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#include <stdint.h>
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#include <string.h>
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/*---------------------------------------------------------------------------*/
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struct channel_ctrl {
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uint32_t src_end_ptr;
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uint32_t dst_end_ptr;
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uint32_t ctrl_word;
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uint32_t unused;
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};
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static volatile struct channel_ctrl channel_config[UDMA_CONF_MAX_CHANNEL + 1]
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__attribute__ ((section(".udma_channel_control_table")));
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/*---------------------------------------------------------------------------*/
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void
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udma_init()
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{
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memset((void *)&channel_config, 0, sizeof(channel_config));
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REG(UDMA_CFG) = UDMA_CFG_MASTEN;
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REG(UDMA_CTLBASE) = (uint32_t)(&channel_config);
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NVIC_EnableIRQ(UDMA_SW_IRQn);
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NVIC_EnableIRQ(UDMA_ERR_IRQn);
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}
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/*---------------------------------------------------------------------------*/
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void
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udma_set_channel_src(uint8_t channel, uint32_t src_end)
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{
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if(channel > UDMA_CONF_MAX_CHANNEL) {
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return;
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}
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channel_config[channel].src_end_ptr = src_end;
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}
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/*---------------------------------------------------------------------------*/
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void
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udma_set_channel_dst(uint8_t channel, uint32_t dst_end)
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{
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if(channel > UDMA_CONF_MAX_CHANNEL) {
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return;
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}
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channel_config[channel].dst_end_ptr = dst_end;
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}
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/*---------------------------------------------------------------------------*/
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void
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udma_set_channel_control_word(uint8_t channel, uint32_t ctrl)
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{
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if(channel > UDMA_CONF_MAX_CHANNEL) {
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return;
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}
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channel_config[channel].ctrl_word = ctrl;
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}
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/*---------------------------------------------------------------------------*/
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void
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udma_set_channel_assignment(uint8_t channel, uint8_t enc)
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{
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uint32_t base_chmap = UDMA_CHMAP0;
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uint8_t shift;
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if(channel > UDMA_CONF_MAX_CHANNEL) {
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return;
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}
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/* Calculate the address of the relevant CHMAP register */
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base_chmap += (channel >> 3) * 4;
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/* Calculate the shift value for the correct CHMAP register bits */
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shift = (channel & 0x07);
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/* Read CHMAPx value, zero out channel's bits and write the new value */
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REG(base_chmap) = (REG(base_chmap) & ~(0x0F << shift)) | (enc << shift);
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}
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/*---------------------------------------------------------------------------*/
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void
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udma_channel_enable(uint8_t channel)
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{
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if(channel > UDMA_CONF_MAX_CHANNEL) {
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return;
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}
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REG(UDMA_ENASET) |= 1 << channel;
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}
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/*---------------------------------------------------------------------------*/
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void
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udma_channel_disable(uint8_t channel)
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{
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if(channel > UDMA_CONF_MAX_CHANNEL) {
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return;
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}
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/* Writes of 0 have no effect, this no need for RMW */
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REG(UDMA_ENACLR) = 1 << channel;
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}
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/*---------------------------------------------------------------------------*/
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void
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udma_channel_use_alternate(uint8_t channel)
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{
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if(channel > UDMA_CONF_MAX_CHANNEL) {
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return;
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}
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REG(UDMA_ALTSET) |= 1 << channel;
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}
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/*---------------------------------------------------------------------------*/
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void
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udma_channel_use_primary(uint8_t channel)
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{
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if(channel > UDMA_CONF_MAX_CHANNEL) {
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return;
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}
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/* Writes of 0 have no effect, this no need for RMW */
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REG(UDMA_ALTCLR) = 1 << channel;
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}
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/*---------------------------------------------------------------------------*/
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void
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udma_channel_prio_set_high(uint8_t channel)
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{
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if(channel > UDMA_CONF_MAX_CHANNEL) {
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return;
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}
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REG(UDMA_PRIOSET) |= 1 << channel;
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}
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/*---------------------------------------------------------------------------*/
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void
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udma_channel_prio_set_default(uint8_t channel)
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{
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if(channel > UDMA_CONF_MAX_CHANNEL) {
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return;
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}
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/* Writes of 0 have no effect, this no need for RMW */
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REG(UDMA_PRIOCLR) = 1 << channel;
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}
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/*---------------------------------------------------------------------------*/
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void
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udma_channel_use_burst(uint8_t channel)
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{
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if(channel > UDMA_CONF_MAX_CHANNEL) {
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return;
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}
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REG(UDMA_USEBURSTSET) |= 1 << channel;
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}
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/*---------------------------------------------------------------------------*/
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void
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udma_channel_use_single(uint8_t channel)
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{
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if(channel > UDMA_CONF_MAX_CHANNEL) {
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return;
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}
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/* Writes of 0 have no effect, this no need for RMW */
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REG(UDMA_USEBURSTCLR) = 1 << channel;
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}
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/*---------------------------------------------------------------------------*/
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void
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udma_channel_mask_set(uint8_t channel)
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{
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if(channel > UDMA_CONF_MAX_CHANNEL) {
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return;
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}
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REG(UDMA_REQMASKSET) |= 1 << channel;
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}
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/*---------------------------------------------------------------------------*/
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void
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udma_channel_mask_clr(uint8_t channel)
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{
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if(channel > UDMA_CONF_MAX_CHANNEL) {
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return;
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}
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/* Writes of 0 have no effect, this no need for RMW */
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REG(UDMA_REQMASKCLR) = 1 << channel;
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}
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/*---------------------------------------------------------------------------*/
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void
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udma_channel_sw_request(uint8_t channel)
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{
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if(channel > UDMA_CONF_MAX_CHANNEL) {
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return;
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}
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REG(UDMA_SWREQ) |= 1 << channel;
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}
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/*---------------------------------------------------------------------------*/
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uint8_t
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udma_channel_get_mode(uint8_t channel)
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{
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if(channel > UDMA_CONF_MAX_CHANNEL) {
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return 0;
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}
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return (channel_config[channel].ctrl_word & 0x07);
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}
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/*---------------------------------------------------------------------------*/
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void
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udma_isr()
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{
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/* Simply clear Channel interrupt status for now */
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REG(UDMA_CHIS) = UDMA_CHIS_CHIS;
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}
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/*---------------------------------------------------------------------------*/
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void
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udma_err_isr()
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{
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/* Stub Implementation, just clear the error flag */
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REG(UDMA_ERRCLR) = 1;
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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