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tinySA/os/hal/platforms/STM32/DMAv1/stm32_dma.c

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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT 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; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT 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, see <http://www.gnu.org/licenses/>.
*/
/**
* @file stm32_dma.c
* @brief STM32 DMA helper driver code.
*
* @addtogroup STM32_DMA
* @details DMA sharing helper driver. In the STM32 the DMA channels are a
* shared resource, this driver allows to allocate and free DMA
* channels at runtime in order to allow all the other device
* drivers to coordinate the access to the resource.
* @note The DMA ISR handlers are all declared into this module because
* sharing, the various device drivers can associate a callback to
* IRSs when allocating channels.
* @{
*/
#include "ch.h"
#include "hal.h"
#if defined(STM32_DMA_REQUIRED) || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/**
* @brief DMA ISR redirector type.
*/
typedef struct {
stm32_dmaisr_t dmaisrfunc;
void *dmaisrparam;
} dma_isr_redir_t;
static uint32_t dmamsk1;
static dma_isr_redir_t dma1[7];
#if STM32_HAS_DMA2
static uint32_t dmamsk2;
static dma_isr_redir_t dma2[5];
#endif
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/**
* @brief DMA1 channel 1 shared interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(DMA1_Ch1_IRQHandler) {
uint32_t isr;
CH_IRQ_PROLOGUE();
isr = STM32_DMA1->ISR >> (STM32_DMA_CHANNEL_1 * 4);
dmaClearChannel(STM32_DMA1, STM32_DMA_CHANNEL_1);
if (dma1[0].dmaisrfunc)
dma1[0].dmaisrfunc(dma1[0].dmaisrparam, isr);
CH_IRQ_EPILOGUE();
}
/**
* @brief DMA1 channel 2 shared interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(DMA1_Ch2_IRQHandler) {
uint32_t isr;
CH_IRQ_PROLOGUE();
isr = STM32_DMA1->ISR >> (STM32_DMA_CHANNEL_2 * 4);
dmaClearChannel(STM32_DMA1, STM32_DMA_CHANNEL_2);
if (dma1[1].dmaisrfunc)
dma1[1].dmaisrfunc(dma1[1].dmaisrparam, isr);
CH_IRQ_EPILOGUE();
}
/**
* @brief DMA1 channel 3 shared interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(DMA1_Ch3_IRQHandler) {
uint32_t isr;
CH_IRQ_PROLOGUE();
isr = STM32_DMA1->ISR >> (STM32_DMA_CHANNEL_3 * 4);
dmaClearChannel(STM32_DMA1, STM32_DMA_CHANNEL_3);
if (dma1[2].dmaisrfunc)
dma1[2].dmaisrfunc(dma1[2].dmaisrparam, isr);
CH_IRQ_EPILOGUE();
}
/**
* @brief DMA1 channel 4 shared interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(DMA1_Ch4_IRQHandler) {
uint32_t isr;
CH_IRQ_PROLOGUE();
isr = STM32_DMA1->ISR >> (STM32_DMA_CHANNEL_4 * 4);
dmaClearChannel(STM32_DMA1, STM32_DMA_CHANNEL_4);
if (dma1[3].dmaisrfunc)
dma1[3].dmaisrfunc(dma1[3].dmaisrparam, isr);
CH_IRQ_EPILOGUE();
}
/**
* @brief DMA1 channel 5 shared interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(DMA1_Ch5_IRQHandler) {
uint32_t isr;
CH_IRQ_PROLOGUE();
isr = STM32_DMA1->ISR >> (STM32_DMA_CHANNEL_5 * 4);
dmaClearChannel(STM32_DMA1, STM32_DMA_CHANNEL_5);
if (dma1[4].dmaisrfunc)
dma1[4].dmaisrfunc(dma1[4].dmaisrparam, isr);
CH_IRQ_EPILOGUE();
}
/**
* @brief DMA1 channel 6 shared interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(DMA1_Ch6_IRQHandler) {
uint32_t isr;
CH_IRQ_PROLOGUE();
isr = STM32_DMA1->ISR >> (STM32_DMA_CHANNEL_6 * 4);
dmaClearChannel(STM32_DMA1, STM32_DMA_CHANNEL_6);
if (dma1[5].dmaisrfunc)
dma1[5].dmaisrfunc(dma1[5].dmaisrparam, isr);
CH_IRQ_EPILOGUE();
}
/**
* @brief DMA1 channel 7 shared interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(DMA1_Ch7_IRQHandler) {
uint32_t isr;
CH_IRQ_PROLOGUE();
isr = STM32_DMA1->ISR >> (STM32_DMA_CHANNEL_7 * 4);
dmaClearChannel(STM32_DMA1, STM32_DMA_CHANNEL_7);
if (dma1[6].dmaisrfunc)
dma1[6].dmaisrfunc(dma1[6].dmaisrparam, isr);
CH_IRQ_EPILOGUE();
}
#if STM32_HAS_DMA2 || defined(__DOXYGEN__)
/**
* @brief DMA2 channel 1 shared interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(DMA2_Ch1_IRQHandler) {
uint32_t isr;
CH_IRQ_PROLOGUE();
isr = STM32_DMA2->ISR >> (STM32_DMA_CHANNEL_1 * 4);
dmaClearChannel(STM32_DMA2, STM32_DMA_CHANNEL_1);
if (dma2[0].dmaisrfunc)
dma2[0].dmaisrfunc(dma2[0].dmaisrparam, isr);
CH_IRQ_EPILOGUE();
}
/**
* @brief DMA2 channel 2 shared interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(DMA2_Ch2_IRQHandler) {
uint32_t isr;
CH_IRQ_PROLOGUE();
isr = STM32_DMA2->ISR >> (STM32_DMA_CHANNEL_2 * 4);
dmaClearChannel(STM32_DMA2, STM32_DMA_CHANNEL_2);
if (dma2[1].dmaisrfunc)
dma2[1].dmaisrfunc(dma2[1].dmaisrparam, isr);
CH_IRQ_EPILOGUE();
}
/**
* @brief DMA2 channel 3 shared interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(DMA2_Ch3_IRQHandler) {
uint32_t isr;
CH_IRQ_PROLOGUE();
isr = STM32_DMA2->ISR >> (STM32_DMA_CHANNEL_3 * 4);
dmaClearChannel(STM32_DMA2, STM32_DMA_CHANNEL_3);
if (dma2[2].dmaisrfunc)
dma2[2].dmaisrfunc(dma2[2].dmaisrparam, isr);
CH_IRQ_EPILOGUE();
}
#if defined(STM32F10X_CL) || defined(__DOXYGEN__)
/**
* @brief DMA2 channel 4 shared interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(DMA2_Ch4_IRQHandler) {
uint32_t isr;
CH_IRQ_PROLOGUE();
isr = STM32_DMA2->ISR >> (STM32_DMA_CHANNEL_4 * 4);
dmaClearChannel(STM32_DMA2, STM32_DMA_CHANNEL_4);
if (dma2[3].dmaisrfunc)
dma2[3].dmaisrfunc(dma2[3].dmaisrparam, isr);
CH_IRQ_EPILOGUE();
}
/**
* @brief DMA2 channel 5 shared interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(DMA2_Ch5_IRQHandler) {
uint32_t isr;
CH_IRQ_PROLOGUE();
isr = STM32_DMA2->ISR >> (STM32_DMA_CHANNEL_5 * 4);
dmaClearChannel(STM32_DMA2, STM32_DMA_CHANNEL_5);
if (dma2[4].dmaisrfunc)
dma2[4].dmaisrfunc(dma2[4].dmaisrparam, isr);
CH_IRQ_EPILOGUE();
}
#else /* !STM32F10X_CL */
/**
* @brief DMA2 channels 4 and 5 shared interrupt handler.
* @note This IRQ is shared between DMA2 channels 4 and 5 so it is a
* bit less efficient because an extra check.
*
* @isr
*/
CH_IRQ_HANDLER(DMA2_Ch4_5_IRQHandler) {
uint32_t isr;
CH_IRQ_PROLOGUE();
/* Check on channel 4.*/
isr = STM32_DMA2->ISR >> (STM32_DMA_CHANNEL_5 * 4);
if (isr & DMA_ISR_GIF1) {
dmaClearChannel(STM32_DMA2, STM32_DMA_CHANNEL_5);
if (dma2[3].dmaisrfunc)
dma2[3].dmaisrfunc(dma2[3].dmaisrparam, isr);
}
/* Check on channel 5.*/
isr = STM32_DMA2->ISR >> (STM32_DMA_CHANNEL_4 * 4);
if (isr & DMA_ISR_GIF1) {
dmaClearChannel(STM32_DMA2, STM32_DMA_CHANNEL_5);
if (dma2[4].dmaisrfunc)
dma2[4].dmaisrfunc(dma2[4].dmaisrparam, isr);
}
CH_IRQ_EPILOGUE();
}
#endif /* !STM32F10X_CL */
#endif /* STM32_HAS_DMA2 */
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief STM32 DMA helper initialization.
*
* @init
*/
void dmaInit(void) {
int i;
dmamsk1 = 0;
for (i = STM32_DMA_CHANNEL_7; i >= STM32_DMA_CHANNEL_1; i--) {
dmaDisableChannel(STM32_DMA1, i);
dma1[i].dmaisrfunc = NULL;
}
STM32_DMA1->IFCR = 0xFFFFFFFF;
#if STM32_HAS_DMA2
dmamsk2 = 0;
for (i = STM32_DMA_CHANNEL_5; i >= STM32_DMA_CHANNEL_1; i--) {
dmaDisableChannel(STM32_DMA2, i);
dma2[i].dmaisrfunc = NULL;
}
STM32_DMA1->IFCR = 0xFFFFFFFF;
#endif
}
/**
* @brief Allocates a DMA channel.
* @details The channel is allocated and, if required, the DMA clock enabled.
* Trying to allocate a channel already allocated is an illegal
* operation and is trapped if assertions are enabled.
* @pre The channel must not be already in use.
* @post The channel is allocated and the default ISR handler redirected
* to the specified function.
* @post The channel must be freed using @p dmaRelease() before it can
* be reused with another peripheral.
* @note This function can be invoked in both ISR or thread context.
*
* @param[in] dma DMA controller id
* @param[in] channel requested channel id
* @param[in] func handling function pointer, can be @p NULL
* @param[in] param a parameter to be passed to the handling function
*
* @special
*/
void dmaAllocate(uint32_t dma, uint32_t channel,
stm32_dmaisr_t func, void *param) {
#if STM32_HAS_DMA2
switch (dma) {
case STM32_DMA1_ID:
#else
(void)dma;
#endif
/* Check if the channel is already taken.*/
chDbgAssert((dmamsk1 & (1 << channel)) == 0,
"dmaAllocate(), #1", "already allocated");
/* If the DMA unit was idle then the clock is enabled.*/
if (dmamsk1 == 0) {
RCC->AHBENR |= RCC_AHBENR_DMA1EN;
DMA1->IFCR = 0x0FFFFFFF;
}
dmamsk1 |= 1 << channel;
dma1[channel].dmaisrfunc = func;
dma1[channel].dmaisrparam = param;
#if STM32_HAS_DMA2
break;
case STM32_DMA2_ID:
/* Check if the channel is already taken.*/
chDbgAssert((dmamsk2 & (1 << channel)) == 0,
"dmaAllocate(), #2", "already allocated");
/* If the DMA unit was idle then the clock is enabled.*/
if (dmamsk2 == 0) {
RCC->AHBENR |= RCC_AHBENR_DMA2EN;
DMA2->IFCR = 0x0FFFFFFF;
}
dmamsk2 |= 1 << channel;
dma2[channel].dmaisrfunc = func;
dma2[channel].dmaisrparam = param;
break;
}
#endif
}
/**
* @brief Releases a DMA channel.
* @details The channel is freed and, if required, the DMA clock disabled.
* Trying to release a unallocated channel is an illegal operation
* and is trapped if assertions are enabled.
* @pre The channel must have been allocated using @p dmaRequest().
* @post The channel is again available.
* @note This function can be invoked in both ISR or thread context.
*
* @param[in] dma DMA controller id
* @param[in] channel requested channel id
*
* @special
*/
void dmaRelease(uint32_t dma, uint32_t channel) {
#if STM32_HAS_DMA2
switch (dma) {
case STM32_DMA1_ID:
#else
(void)dma;
#endif
/* Check if the channel is not taken.*/
chDbgAssert((dmamsk1 & (1 << channel)) != 0,
"dmaRelease(), #1", "not allocated");
dma1[channel].dmaisrfunc = NULL;
dmamsk1 &= ~(1 << channel);
if (dmamsk1 == 0)
RCC->AHBENR &= ~RCC_AHBENR_DMA1EN;
#if STM32_HAS_DMA2
break;
case STM32_DMA2_ID:
/* Check if the channel is not taken.*/
chDbgAssert((dmamsk2 & (1 << channel)) != 0,
"dmaRelease(), #2", "not allocated");
dma2[channel].dmaisrfunc = NULL;
dmamsk2 &= ~(1 << channel);
if (dmamsk2 == 0)
RCC->AHBENR &= ~RCC_AHBENR_DMA2EN;
break;
}
#endif
}
#endif /* STM32_DMA_REQUIRED */
/** @} */
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