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/*
* Copyright © 2012 Keith Packard <keithp@keithp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "ao.h"
#define NUM_DMA 7
struct ao_dma_config {
void (*isr)(int arg);
int arg;
};
uint8_t ao_dma_done[NUM_DMA];
static struct ao_dma_config ao_dma_config[NUM_DMA];
static uint8_t ao_dma_allocated[NUM_DMA];
static uint8_t ao_dma_mutex[NUM_DMA];
static uint8_t ao_dma_active;
static void
ao_dma_isr(uint8_t index) {
/* Get channel interrupt bits */
uint32_t isr = stm_dma.isr & (STM_DMA_ISR_MASK <<
STM_DMA_ISR(index));
/* Ack them */
stm_dma.ifcr = isr;
if (ao_dma_config[index].isr)
(*ao_dma_config[index].isr)(ao_dma_config[index].arg);
else {
ao_dma_done[index] = 1;
ao_wakeup(&ao_dma_done[index]);
}
}
void stm_dma1_channel1_isr(void) { ao_dma_isr(STM_DMA_INDEX(1)); }
void stm_dma1_channel2_isr(void) { ao_dma_isr(STM_DMA_INDEX(2)); }
void stm_dma1_channel3_isr(void) { ao_dma_isr(STM_DMA_INDEX(3)); }
void stm_dma1_channel4_isr(void) { ao_dma_isr(STM_DMA_INDEX(4)); }
void stm_dma1_channel5_isr(void) { ao_dma_isr(STM_DMA_INDEX(5)); }
void stm_dma1_channel6_isr(void) { ao_dma_isr(STM_DMA_INDEX(6)); }
void stm_dma1_channel7_isr(void) { ao_dma_isr(STM_DMA_INDEX(7)); }
void
ao_dma_set_transfer(uint8_t index,
volatile void *peripheral,
void *memory,
uint16_t count,
uint32_t ccr)
{
if (ao_dma_allocated[index]) {
if (ao_dma_mutex[index])
ao_panic(AO_PANIC_DMA);
ao_dma_mutex[index] = 1;
} else
ao_mutex_get(&ao_dma_mutex[index]);
ao_arch_critical(
if (ao_dma_active++ == 0)
stm_rcc.ahbenr |= (1 << STM_RCC_AHBENR_DMA1EN);
);
stm_dma.channel[index].ccr = ccr | (1 << STM_DMA_CCR_TCIE);
stm_dma.channel[index].cndtr = count;
stm_dma.channel[index].cpar = peripheral;
stm_dma.channel[index].cmar = memory;
ao_dma_config[index].isr = NULL;
}
void
ao_dma_set_isr(uint8_t index, void (*isr)(int), int arg)
{
ao_dma_config[index].arg = arg;
ao_dma_config[index].isr = isr;
}
void
ao_dma_start(uint8_t index)
{
ao_dma_done[index] = 0;
stm_dma.channel[index].ccr |= (1 << STM_DMA_CCR_EN);
}
void
ao_dma_done_transfer(uint8_t index)
{
stm_dma.channel[index].ccr &= ~(1 << STM_DMA_CCR_EN);
ao_arch_critical(
if (--ao_dma_active == 0)
stm_rcc.ahbenr &= ~(1 << STM_RCC_AHBENR_DMA1EN);
);
if (ao_dma_allocated[index])
ao_dma_mutex[index] = 0;
else
ao_mutex_put(&ao_dma_mutex[index]);
}
void
ao_dma_abort(uint8_t index)
{
stm_dma.channel[index].ccr &= ~(1 << STM_DMA_CCR_EN);
ao_wakeup(&ao_dma_done[index]);
}
void
ao_dma_alloc(uint8_t index)
{
if (ao_dma_allocated[index])
ao_panic(AO_PANIC_DMA);
ao_dma_allocated[index] = 1;
}
void
ao_dma_init(void)
{
int index;
for (index = 0; index < STM_NUM_DMA; index++) {
stm_nvic_set_enable(STM_ISR_DMA1_CHANNEL1_POS + index);
stm_nvic_set_priority(STM_ISR_DMA1_CHANNEL1_POS + index, 4);
ao_dma_allocated[index] = 0;
ao_dma_mutex[index] = 0;
}
}
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