/**************************************************************************** * arch/arm/src/stm32/stm32f10xxx_dma.c * * Copyright (C) 2009, 2011-2012 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include #include "up_arch.h" #include "up_internal.h" #include "os_internal.h" #include "chip.h" #include "stm32_dma.h" #include "stm32_internal.h" /* Only for the STM32F10xx family for now */ #ifdef CONFIG_STM32_STM32F10XX /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ #define DMA1_NCHANNELS 7 #if STM32_NDMA > 1 # define DMA2_NCHANNELS 5 # define DMA_NCHANNELS (DMA1_NCHANNELS+DMA2_NCHANNELS) #else # define DMA_NCHANNELS DMA1_NCHANNELS #endif #ifndef CONFIG_DMA_PRI # define CONFIG_DMA_PRI NVIC_SYSH_PRIORITY_DEFAULT #endif /* Convert the DMA channel base address to the DMA register block address */ #define DMA_BASE(ch) (ch & 0xfffffc00) /**************************************************************************** * Private Types ****************************************************************************/ /* This structure descibes one DMA channel */ struct stm32_dma_s { uint8_t chan; /* DMA channel number (0-6) */ uint8_t irq; /* DMA channel IRQ number */ sem_t sem; /* Used to wait for DMA channel to become available */ uint32_t base; /* DMA register channel base address */ dma_callback_t callback; /* Callback invoked when the DMA completes */ void *arg; /* Argument passed to callback function */ }; /**************************************************************************** * Private Data ****************************************************************************/ /* This array describes the state of each DMA */ static struct stm32_dma_s g_dma[DMA_NCHANNELS] = { { .chan = 0, .irq = STM32_IRQ_DMA1CH1, .base = STM32_DMA1_BASE + STM32_DMACHAN_OFFSET(0), }, { .chan = 1, .irq = STM32_IRQ_DMA1CH2, .base = STM32_DMA1_BASE + STM32_DMACHAN_OFFSET(1), }, { .chan = 2, .irq = STM32_IRQ_DMA1CH3, .base = STM32_DMA1_BASE + STM32_DMACHAN_OFFSET(2), }, { .chan = 3, .irq = STM32_IRQ_DMA1CH4, .base = STM32_DMA1_BASE + STM32_DMACHAN_OFFSET(3), }, { .chan = 4, .irq = STM32_IRQ_DMA1CH5, .base = STM32_DMA1_BASE + STM32_DMACHAN_OFFSET(4), }, { .chan = 5, .irq = STM32_IRQ_DMA1CH6, .base = STM32_DMA1_BASE + STM32_DMACHAN_OFFSET(5), }, { .chan = 6, .irq = STM32_IRQ_DMA1CH7, .base = STM32_DMA1_BASE + STM32_DMACHAN_OFFSET(6), }, #if STM32_NDMA > 1 { .chan = 0, .irq = STM32_IRQ_DMA2CH1, .base = STM32_DMA2_BASE + STM32_DMACHAN_OFFSET(0), }, { .chan = 1, .irq = STM32_IRQ_DMA2CH2, .base = STM32_DMA2_BASE + STM32_DMACHAN_OFFSET(1), }, { .chan = 2, .irq = STM32_IRQ_DMA2CH3, .base = STM32_DMA2_BASE + STM32_DMACHAN_OFFSET(2), }, { .chan = 3, #ifdef CONFIG_STM32_CONNECTIVITYLINE .irq = STM32_IRQ_DMA2CH4, #else .irq = STM32_IRQ_DMA2CH45, #endif .base = STM32_DMA2_BASE + STM32_DMACHAN_OFFSET(3), }, { .chan = 4, #ifdef CONFIG_STM32_CONNECTIVITYLINE .irq = STM32_IRQ_DMA2CH5, #else .irq = STM32_IRQ_DMA2CH45, #endif .base = STM32_DMA2_BASE + STM32_DMACHAN_OFFSET(4), }, #endif }; /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * DMA register access functions ****************************************************************************/ /* Get non-channel register from DMA1 or DMA2 */ static inline uint32_t dmabase_getreg(struct stm32_dma_s *dmach, uint32_t offset) { return getreg32(DMA_BASE(dmach->base) + offset); } /* Write to non-channel register in DMA1 or DMA2 */ static inline void dmabase_putreg(struct stm32_dma_s *dmach, uint32_t offset, uint32_t value) { putreg32(value, DMA_BASE(dmach->base) + offset); } /* Get channel register from DMA1 or DMA2 */ static inline uint32_t dmachan_getreg(struct stm32_dma_s *dmach, uint32_t offset) { return getreg32(dmach->base + offset); } /* Write to channel register in DMA1 or DMA2 */ static inline void dmachan_putreg(struct stm32_dma_s *dmach, uint32_t offset, uint32_t value) { putreg32(value, dmach->base + offset); } /************************************************************************************ * Name: stm32_dmatake() and stm32_dmagive() * * Description: * Used to get exclusive access to a DMA channel. * ************************************************************************************/ static void stm32_dmatake(FAR struct stm32_dma_s *dmach) { /* Take the semaphore (perhaps waiting) */ while (sem_wait(&dmach->sem) != 0) { /* The only case that an error should occur here is if the wait was awakened * by a signal. */ ASSERT(errno == EINTR); } } static inline void stm32_dmagive(FAR struct stm32_dma_s *dmach) { (void)sem_post(&dmach->sem); } /************************************************************************************ * Name: stm32_dmachandisable * * Description: * Disable the DMA channel * ************************************************************************************/ static void stm32_dmachandisable(struct stm32_dma_s *dmach) { uint32_t regval; /* Disable all interrupts at the DMA controller */ regval = dmachan_getreg(dmach, STM32_DMACHAN_CCR_OFFSET); regval &= ~DMA_CCR_ALLINTS; /* Disable the DMA channel */ regval &= ~DMA_CCR_EN; dmachan_putreg(dmach, STM32_DMACHAN_CCR_OFFSET, regval); /* Clear pending channel interrupts */ dmabase_putreg(dmach, STM32_DMA_IFCR_OFFSET, DMA_ISR_CHAN_MASK(dmach->chan)); } /************************************************************************************ * Name: stm32_dmainterrupt * * Description: * DMA interrupt handler * ************************************************************************************/ static int stm32_dmainterrupt(int irq, void *context) { struct stm32_dma_s *dmach; uint32_t isr; int chndx = 0; /* Get the channel structure from the interrupt number */ if (irq >= STM32_IRQ_DMA1CH1 && irq <= STM32_IRQ_DMA1CH7) { chndx = irq - STM32_IRQ_DMA1CH1; } else #if STM32_NDMA > 1 #ifdef CONFIG_STM32_CONNECTIVITYLINE if (irq >= STM32_IRQ_DMA2CH1 && irq <= STM32_IRQ_DMA2CH5) #else if (irq >= STM32_IRQ_DMA2CH1 && irq <= STM32_IRQ_DMA2CH45) #endif { chndx = irq - STM32_IRQ_DMA2CH1 + DMA1_NCHANNELS; } else #endif { PANIC(OSERR_INTERNAL); } dmach = &g_dma[chndx]; /* Get the interrupt status (for this channel only) -- not currently used */ isr = dmabase_getreg(dmach, STM32_DMA_ISR_OFFSET) & DMA_ISR_CHAN_MASK(dmach->chan); /* Disable the DMA channel */ stm32_dmachandisable(dmach); /* Invoke the callback */ if (dmach->callback) { dmach->callback(dmach, isr >> DMA_ISR_CHAN_SHIFT(dmach->chan), dmach->arg); } return OK; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: stm32_dmainitialize * * Description: * Initialize the DMA subsystem * * Returned Value: * None * ****************************************************************************/ void weak_function up_dmainitialize(void) { struct stm32_dma_s *dmach; int chndx; /* Initialize each DMA channel */ for (chndx = 0; chndx < DMA_NCHANNELS; chndx++) { dmach = &g_dma[chndx]; sem_init(&dmach->sem, 0, 1); /* Attach DMA interrupt vectors */ (void)irq_attach(dmach->irq, stm32_dmainterrupt); /* Disable the DMA channel */ stm32_dmachandisable(dmach); /* Enable the IRQ at the NVIC (still disabled at the DMA controller) */ up_enable_irq(dmach->irq); /* Set the interrrupt priority */ up_prioritize_irq(dmach->irq, CONFIG_DMA_PRI); } } /**************************************************************************** * Name: stm32_dmachannel * * Description: * Allocate a DMA channel. This function gives the caller mutually * exclusive access to the DMA channel specified by the 'chndx' argument. * DMA channels are shared on the STM32: Devices sharing the same DMA * channel cannot do DMA concurrently! See the DMACHAN_* definitions in * stm32_dma.h. * * If the DMA channel is not available, then stm32_dmachannel() will wait * until the holder of the channel relinquishes the channel by calling * stm32_dmafree(). WARNING: If you have two devices sharing a DMA * channel and the code never releases the channel, the stm32_dmachannel * call for the other will hang forever in this function! Don't let your * design do that! * * Hmm.. I suppose this interface could be extended to make a non-blocking * version. Feel free to do that if that is what you need. * * Input parameter: * chndx - Identifies the stream/channel resource. For the STM32 F1, this * is simply the channel number as provided by the DMACHAN_* definitions * in chip/stm32f10xxx_dma.h. * * Returned Value: * Provided that 'chndx' is valid, this function ALWAYS returns a non-NULL, * void* DMA channel handle. (If 'chndx' is invalid, the function will * assert if debug is enabled or do something ignorant otherwise). * * Assumptions: * - The caller does not hold he DMA channel. * - The caller can wait for the DMA channel to be freed if it is no * available. * ****************************************************************************/ DMA_HANDLE stm32_dmachannel(unsigned int chndx) { struct stm32_dma_s *dmach = &g_dma[chndx]; DEBUGASSERT(chndx < DMA_NCHANNELS); /* Get exclusive access to the DMA channel -- OR wait until the channel * is available if it is currently being used by another driver */ stm32_dmatake(dmach); /* The caller now has exclusive use of the DMA channel */ return (DMA_HANDLE)dmach; } /**************************************************************************** * Name: stm32_dmafree * * Description: * Release a DMA channel. If another thread is waiting for this DMA channel * in a call to stm32_dmachannel, then this function will re-assign the * DMA channel to that thread and wake it up. NOTE: The 'handle' used * in this argument must NEVER be used again until stm32_dmachannel() is * called again to re-gain access to the channel. * * Returned Value: * None * * Assumptions: * - The caller holds the DMA channel. * - There is no DMA in progress * ****************************************************************************/ void stm32_dmafree(DMA_HANDLE handle) { struct stm32_dma_s *dmach = (struct stm32_dma_s *)handle; DEBUGASSERT(handle != NULL); /* Release the channel */ stm32_dmagive(dmach); } /**************************************************************************** * Name: stm32_dmasetup * * Description: * Configure DMA before using * ****************************************************************************/ void stm32_dmasetup(DMA_HANDLE handle, uint32_t paddr, uint32_t maddr, size_t ntransfers, uint32_t ccr) { struct stm32_dma_s *dmach = (struct stm32_dma_s *)handle; uint32_t regval; /* Set the peripheral register address in the DMA_CPARx register. The data * will be moved from/to this address to/from the memory after the * peripheral event. */ dmachan_putreg(dmach, STM32_DMACHAN_CPAR_OFFSET, paddr); /* Set the memory address in the DMA_CMARx register. The data will be * written to or read from this memory after the peripheral event. */ dmachan_putreg(dmach, STM32_DMACHAN_CMAR_OFFSET, maddr); /* Configure the total number of data to be transferred in the DMA_CNDTRx * register. After each peripheral event, this value will be decremented. */ dmachan_putreg(dmach, STM32_DMACHAN_CNDTR_OFFSET, ntransfers); /* Configure the channel priority using the PL[1:0] bits in the DMA_CCRx * register. Configure data transfer direction, circular mode, peripheral & memory * incremented mode, peripheral & memory data size, and interrupt after * half and/or full transfer in the DMA_CCRx register. */ regval = dmachan_getreg(dmach, STM32_DMACHAN_CCR_OFFSET); regval &= ~(DMA_CCR_MEM2MEM|DMA_CCR_PL_MASK|DMA_CCR_MSIZE_MASK|DMA_CCR_PSIZE_MASK| DMA_CCR_MINC|DMA_CCR_PINC|DMA_CCR_CIRC|DMA_CCR_DIR); ccr &= (DMA_CCR_MEM2MEM|DMA_CCR_PL_MASK|DMA_CCR_MSIZE_MASK|DMA_CCR_PSIZE_MASK| DMA_CCR_MINC|DMA_CCR_PINC|DMA_CCR_CIRC|DMA_CCR_DIR); regval |= ccr; dmachan_putreg(dmach, STM32_DMACHAN_CCR_OFFSET, regval); } /**************************************************************************** * Name: stm32_dmastart * * Description: * Start the DMA transfer * * Assumptions: * - DMA handle allocated by stm32_dmachannel() * - No DMA in progress * ****************************************************************************/ void stm32_dmastart(DMA_HANDLE handle, dma_callback_t callback, void *arg, bool half) { struct stm32_dma_s *dmach = (struct stm32_dma_s *)handle; uint32_t ccr; DEBUGASSERT(handle != NULL); /* Save the callback info. This will be invoked whent the DMA commpletes */ dmach->callback = callback; dmach->arg = arg; /* Activate the channel by setting the ENABLE bit in the DMA_CCRx register. * As soon as the channel is enabled, it can serve any DMA request from the * peripheral connected on the channel. */ ccr = dmachan_getreg(dmach, STM32_DMACHAN_CCR_OFFSET); ccr |= DMA_CCR_EN; /* Once half of the bytes are transferred, the half-transfer flag (HTIF) is * set and an interrupt is generated if the Half-Transfer Interrupt Enable * bit (HTIE) is set. At the end of the transfer, the Transfer Complete Flag * (TCIF) is set and an interrupt is generated if the Transfer Complete * Interrupt Enable bit (TCIE) is set. */ ccr |= (half ? (DMA_CCR_HTIE|DMA_CCR_TEIE) : (DMA_CCR_TCIE|DMA_CCR_TEIE)); dmachan_putreg(dmach, STM32_DMACHAN_CCR_OFFSET, ccr); } /**************************************************************************** * Name: stm32_dmastop * * Description: * Cancel the DMA. After stm32_dmastop() is called, the DMA channel is * reset and stm32_dmasetup() must be called before stm32_dmastart() can be * called again * * Assumptions: * - DMA handle allocated by stm32_dmachannel() * ****************************************************************************/ void stm32_dmastop(DMA_HANDLE handle) { struct stm32_dma_s *dmach = (struct stm32_dma_s *)handle; stm32_dmachandisable(dmach); } /**************************************************************************** * Name: stm32_dmasample * * Description: * Sample DMA register contents * * Assumptions: * - DMA handle allocated by stm32_dmachannel() * ****************************************************************************/ #ifdef CONFIG_DEBUG_DMA void stm32_dmasample(DMA_HANDLE handle, struct stm32_dmaregs_s *regs) { struct stm32_dma_s *dmach = (struct stm32_dma_s *)handle; irqstate_t flags; flags = irqsave(); regs->isr = dmabase_getreg(dmach, STM32_DMA_ISR_OFFSET); regs->ccr = dmachan_getreg(dmach, STM32_DMACHAN_CCR_OFFSET); regs->cndtr = dmachan_getreg(dmach, STM32_DMACHAN_CNDTR_OFFSET); regs->cpar = dmachan_getreg(dmach, STM32_DMACHAN_CPAR_OFFSET); regs->cmar = dmachan_getreg(dmach, STM32_DMACHAN_CMAR_OFFSET); irqrestore(flags); } #endif /**************************************************************************** * Name: stm32_dmadump * * Description: * Dump previously sampled DMA register contents * * Assumptions: * - DMA handle allocated by stm32_dmachannel() * ****************************************************************************/ #ifdef CONFIG_DEBUG_DMA void stm32_dmadump(DMA_HANDLE handle, const struct stm32_dmaregs_s *regs, const char *msg) { struct stm32_dma_s *dmach = (struct stm32_dma_s *)handle; uint32_t dmabase = DMA_BASE(dmach->base); dmadbg("DMA Registers: %s\n", msg); dmadbg(" ISRC[%08x]: %08x\n", dmabase + STM32_DMA_ISR_OFFSET, regs->isr); dmadbg(" CCR[%08x]: %08x\n", dmach->base + STM32_DMACHAN_CCR_OFFSET, regs->ccr); dmadbg(" CNDTR[%08x]: %08x\n", dmach->base + STM32_DMACHAN_CNDTR_OFFSET, regs->cndtr); dmadbg(" CPAR[%08x]: %08x\n", dmach->base + STM32_DMACHAN_CPAR_OFFSET, regs->cpar); dmadbg(" CMAR[%08x]: %08x\n", dmach->base + STM32_DMACHAN_CMAR_OFFSET, regs->cmar); } #endif #endif /* CONFIG_STM32_STM32F10XX */