diff options
Diffstat (limited to 'nuttx/arch/arm/src/stm32/stm32f10xxx_dma.c')
| -rw-r--r-- | nuttx/arch/arm/src/stm32/stm32f10xxx_dma.c | 610 |
1 files changed, 610 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/stm32/stm32f10xxx_dma.c b/nuttx/arch/arm/src/stm32/stm32f10xxx_dma.c new file mode 100644 index 000000000..eaa719e41 --- /dev/null +++ b/nuttx/arch/arm/src/stm32/stm32f10xxx_dma.c @@ -0,0 +1,610 @@ +/**************************************************************************** + * arch/arm/src/stm32/stm32f10xxx_dma.c + * + * Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * 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 <nuttx/config.h> + +#include <stdint.h> +#include <stdbool.h> +#include <semaphore.h> +#include <debug.h> +#include <errno.h> + +#include <nuttx/irq.h> +#include <nuttx/arch.h> +#include <arch/irq.h> + +#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_CONNECTIVITY_LINE + .irq = STM32_IRQ_DMA2CH4, +#else + .irq = STM32_IRQ_DMA2CH45, +#endif + .base = STM32_DMA2_BASE + STM32_DMACHAN_OFFSET(3), + }, + { + .chan = 4, +#ifdef CONFIG_STM32_CONNECTIVITY_LINE + .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_CONNECTIVITY_LINE + 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. + * + * 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(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 */ |