/**************************************************************************** * arch/arm/src/stm32f0l0g0/stm32_dma_v1.c * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include "arm_arch.h" #include "arm_internal.h" #include "sched/sched.h" #include "chip.h" #include "stm32_dma.h" #include "stm32.h" /* This file supports the STM32 DMA IP core version 1 - F0, F1, F3, L0, L1, * L4 * * F0, L0 and L4 have the additional CSELR register which is used to remap * the DMA requests for each channel. */ #ifdef CONFIG_STM32F0L0G0_HAVE_DMAMUX # error DMAMUX not supported yet #endif /**************************************************************************** * 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 /* Convert the DMA channel base address to the DMA register block address */ #define DMA_BASE(ch) (ch & 0xfffffc00) /**************************************************************************** * Private Types ****************************************************************************/ /* This structure describes one DMA channel */ struct stm32_dma_s { uint8_t chan; /* DMA channel number (0-6) */ #ifdef DMA_HAVE_CSELR uint8_t function; /* DMA peripheral connected to this channel (0-7) */ #endif 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, .irq = STM32_IRQ_DMA2CH4, .base = STM32_DMA2_BASE + STM32_DMACHAN_OFFSET(3), }, { .chan = 4, .irq = STM32_IRQ_DMA2CH5, .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 int stm32_dmatake(FAR struct stm32_dma_s *dmach) { return nxsem_wait_uninterruptible(&dmach->sem); } static inline void stm32_dmagive(FAR struct stm32_dma_s *dmach) { nxsem_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, FAR void *arg) { 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 if (irq >= STM32_IRQ_DMA2CH1 && irq <= STM32_IRQ_DMA2CH5) { chndx = irq - STM32_IRQ_DMA2CH1 + DMA1_NCHANNELS; } else #endif { DEBUGPANIC(); } dmach = &g_dma[chndx]; /* Get the interrupt status (for this channel only) */ isr = dmabase_getreg(dmach, STM32_DMA_ISR_OFFSET) & DMA_ISR_CHAN_MASK(dmach->chan); /* Clear the interrupts we are handling */ dmabase_putreg(dmach, STM32_DMA_IFCR_OFFSET, isr); /* 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 arm_dma_initialize(void) { struct stm32_dma_s *dmach; int chndx; /* Initialize each DMA channel */ for (chndx = 0; chndx < DMA_NCHANNELS; chndx++) { dmach = &g_dma[chndx]; nxsem_init(&dmach->sem, 0, 1); /* Attach DMA interrupt vectors */ irq_attach(dmach->irq, stm32_dmainterrupt, NULL); /* Disable the DMA channel */ stm32_dmachandisable(dmach); /* Enable the IRQ at the NVIC (still disabled at the DMA controller) */ up_enable_irq(dmach->irq); } } /**************************************************************************** * 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 Parameters: * 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 chndef) { int chndx = 0; struct stm32_dma_s *dmach = NULL; int ret; #ifdef DMA_HAVE_CSELR chndx = (chndef & DMACHAN_SETTING_CHANNEL_MASK) >> DMACHAN_SETTING_CHANNEL_SHIFT; #else chndx = chndef; #endif 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 */ ret = stm32_dmatake(dmach); if (ret < 0) { return NULL; } /* The caller now has exclusive use of the DMA channel */ #ifdef DMA_HAVE_CSELR /* Define the peripheral that will use the channel. This is stored until * dmasetup is called. */ dmach->function = (chndef & DMACHAN_SETTING_FUNCTION_MASK) >> DMACHAN_SETTING_FUNCTION_SHIFT; #endif 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; /* Then DMA_CNDTRx register can only be modified if the DMA channel is * disabled. */ regval = dmachan_getreg(dmach, STM32_DMACHAN_CCR_OFFSET); regval &= ~(DMA_CCR_EN); dmachan_putreg(dmach, STM32_DMACHAN_CCR_OFFSET, 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 * and 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); #ifdef DMA_HAVE_CSELR /* Define peripheral indicated in dmach->function */ regval = dmabase_getreg(dmach, STM32_DMA_CSELR_OFFSET); regval &= ~(0x0f << (dmach->chan << 2)); regval |= (dmach->function << (dmach->chan << 2)); dmabase_putreg(dmach, STM32_DMA_CSELR_OFFSET, regval); #endif } /**************************************************************************** * 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 completes */ 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; /* In normal mode, interrupt at either half or full completion. In circular * mode, always interrupt on buffer wrap, and optionally interrupt at the * halfway point. */ if ((ccr & DMA_CCR_CIRC) == 0) { /* 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)); } else { /* In nonstop mode, when the transfer completes it immediately resets * and starts again. The transfer-complete interrupt is thus always * enabled, and the half-complete interrupt can be used in circular * mode to determine when the buffer is half-full or in double-buffered * mode to determine when one of the two buffers is full. */ ccr |= (half ? DMA_CCR_HTIE : 0) | 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_dmaresidual * * Description: * Returns the number of bytes remaining to be transferred * * Assumptions: * - DMA handle allocated by stm32_dmachannel() * ****************************************************************************/ size_t stm32_dmaresidual(DMA_HANDLE handle) { struct stm32_dma_s *dmach = (struct stm32_dma_s *)handle; return dmachan_getreg(dmach, STM32_DMACHAN_CNDTR_OFFSET); } /**************************************************************************** * Name: stm32_dmacapable * * Description: * Check if the DMA controller can transfer data to/from given memory * address. This depends on the internal connections in the ARM bus matrix * of the processor. Note that this only applies to memory addresses, it * will return false for any peripheral address. * * Returned Value: * True, if transfer is possible. * ****************************************************************************/ #ifdef CONFIG_STM32F0L0G0_DMACAPABLE bool stm32_dmacapable(uintptr_t maddr, uint32_t count, uint32_t ccr) { uint32_t transfer_size; uint32_t mend; /* Verify that the address conforms to the memory transfer size. * Transfers to/from memory performed by the DMA controller are * required to be aligned to their size. * * See ST RM0090 rev4, section 9.3.11 * * Compute mend inline to avoid a possible non-constant integer * multiply. */ switch (ccr & DMA_CCR_MSIZE_MASK) { case DMA_CCR_MSIZE_8BITS: transfer_size = 1; mend = maddr + count - 1; break; case DMA_CCR_MSIZE_16BITS: transfer_size = 2; mend = maddr + (count << 1) - 1; break; case DMA_CCR_MSIZE_32BITS: transfer_size = 4; mend = maddr + (count << 2) - 1; break; default: return false; } if ((maddr & (transfer_size - 1)) != 0) { return false; } /* Verify that the transfer is to a memory region that supports DMA. */ if ((maddr & STM32_REGION_MASK) != (mend & STM32_REGION_MASK)) { return false; } switch (maddr & STM32_REGION_MASK) { case STM32_SRAM_BASE: case STM32_CODE_BASE: /* All RAM and flash is supported */ return true; default: /* Everything else is unsupported by DMA */ return false; } } #endif /**************************************************************************** * Name: stm32_dmasample * * Description: * Sample DMA register contents * * Assumptions: * - DMA handle allocated by stm32_dmachannel() * ****************************************************************************/ #ifdef CONFIG_DEBUG_DMA_INFO 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 = enter_critical_section(); regs->isr = dmabase_getreg(dmach, STM32_DMA_ISR_OFFSET); #ifdef DMA_HAVE_CSELR regs->cselr = dmabase_getreg(dmach, STM32_DMA_CSELR_OFFSET); #endif 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); leave_critical_section(flags); } #endif /**************************************************************************** * Name: stm32_dmadump * * Description: * Dump previously sampled DMA register contents * * Assumptions: * - DMA handle allocated by stm32_dmachannel() * ****************************************************************************/ #ifdef CONFIG_DEBUG_DMA_INFO 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); dmainfo("DMA Registers: %s\n", msg); dmainfo(" ISRC[%08x]: %08x\n", dmabase + STM32_DMA_ISR_OFFSET, regs->isr); #ifdef DMA_HAVE_CSELR dmainfo(" CSELR[%08x]: %08x\n", dmabase + STM32_DMA_CSELR_OFFSET, regs->cselr); #endif dmainfo(" CCR[%08x]: %08x\n", dmach->base + STM32_DMACHAN_CCR_OFFSET, regs->ccr); dmainfo(" CNDTR[%08x]: %08x\n", dmach->base + STM32_DMACHAN_CNDTR_OFFSET, regs->cndtr); dmainfo(" CPAR[%08x]: %08x\n", dmach->base + STM32_DMACHAN_CPAR_OFFSET, regs->cpar); dmainfo(" CMAR[%08x]: %08x\n", dmach->base + STM32_DMACHAN_CMAR_OFFSET, regs->cmar); } #endif #ifdef CONFIG_ARCH_HIPRI_INTERRUPT /**************************************************************************** * Name: stm32_dma_intack * * Description: * Public visible interface to acknowledge interrupts on DMA channel * ****************************************************************************/ void stm32_dma_intack(unsigned int chndx, uint32_t isr) { struct stm32_dma_s *dmach = &g_dma[chndx]; dmabase_putreg(dmach, STM32_DMA_IFCR_OFFSET, isr); } /**************************************************************************** * Name: stm32_dma_intget * * Description: * Public visible interface to get pending interrupts from DMA channel * ****************************************************************************/ uint32_t stm32_dma_intget(unsigned int chndx) { struct stm32_dma_s *dmach = &g_dma[chndx]; return dmabase_getreg(dmach, STM32_DMA_ISR_OFFSET) & DMA_ISR_CHAN_MASK(dmach->chan); } #endif /* CONFIG_ARCH_HIPRI_INTERRUPT */