/************************************************************************************ * arch/arm/src/sam34/sam_dmac.h * * Copyright (C) 2009-2011, 2013 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. * ************************************************************************************/ #ifndef __ARCH_ARM_SRC_SAM34_SAM_DMAC_H #define __ARCH_ARM_SRC_SAM34_SAM_DMAC_H /************************************************************************************ * Included Files ************************************************************************************/ #include #include #include "chip.h" /************************************************************************************ * Definitions ************************************************************************************/ /* Configuration ********************************************************************/ #ifndef CONFIG_DEBUG # undef CONFIG_DEBUG_DMA #endif /* DMA ******************************************************************************/ /* Flags used to characterize the desired DMA channel. The naming convention is that * one side is the peripheral and the other is memory (however, the interface could still * be used if, for example, both sides were memory although the naming would be awkward) */ /* Unchange-able properties of the channel */ #define DMACH_FLAG_FLOWCONTROL (1 << 0) /* Bit 0: Channel supports flow control */ #define DMACH_FLAG_FIFOSIZE_SHIFT (1) /* Bit 1: Size of DMA FIFO */ #define DMACH_FLAG_FIFOSIZE_MASK (1 << DMACH_FLAG_FIFOSIZE_SHIFT) # define DMACH_FLAG_FIFO_8BYTES (0 << DMACH_FLAG_FIFOSIZE_SHIFT) /* 8 bytes */ # define DMACH_FLAG_FIFO_32BYTES (1 << DMACH_FLAG_FIFOSIZE_SHIFT) /* 32 bytes */ /* Configurable properties of the channel */ #define DMACH_FLAG_BURST_LARGEST 0 /* Largest length AHB burst */ #define DMACH_FLAG_BURST_HALF 1 /* Half FIFO size */ #define DMACH_FLAG_BURST_SINGLE 2 /* Single AHB access */ #define DMACH_FLAG_FIFOCFG_SHIFT (2) /* Bits 2-3: FIFO configuration */ #define DMACH_FLAG_FIFOCFG_MASK (3 << DMACH_FLAG_FIFOCFG_SHIFT) # define DMACH_FLAG_FIFOCFG_LARGEST (DMACH_FLAG_BURST_LARGEST << DMACH_FLAG_FIFOCFG_SHIFT) # define DMACH_FLAG_FIFOCFG_HALF (DMACH_FLAG_BURST_HALF << DMACH_FLAG_FIFOCFG_SHIFT) # define DMACH_FLAG_FIFOCFG_SINGLE (DMACH_FLAG_BURST_SINGLE << DMACH_FLAG_FIFOCFG_SHIFT) /* Peripheral endpoint characteristics */ #define DMACH_FLAG_PERIPHPID_SHIFT (4) /* Bits 4-7: Peripheral PID */ #define DMACH_FLAG_PERIPHPID_MASK (15 << DMACH_FLAG_PERIPHPID_SHIFT) #define DMACH_FLAG_PERIPHH2SEL (1 << 8) /* Bits 8: HW handshaking */ #define DMACH_FLAG_PERIPHISPERIPH (1 << 9) /* Bits 9: 0=memory; 1=peripheral */ #define DMACH_FLAG_PERIPHWIDTH_SHIFT (10) /* Bits 10-11: Peripheral width */ #define DMACH_FLAG_PERIPHWIDTH_MASK (3 << DMACH_FLAG_PERIPHWIDTH_SHIFT) # define DMACH_FLAG_PERIPHWIDTH_8BITS (0 << DMACH_FLAG_PERIPHWIDTH_SHIFT) /* 8 bits */ # define DMACH_FLAG_PERIPHWIDTH_16BITS (1 << DMACH_FLAG_PERIPHWIDTH_SHIFT) /* 16 bits */ # define DMACH_FLAG_PERIPHWIDTH_32BITS (2 << DMACH_FLAG_PERIPHWIDTH_SHIFT) /* 32 bits */ #define DMACH_FLAG_PERIPHINCREMENT (1 << 12) /* Bit 12: Autoincrement peripheral address */ #define DMACH_FLAG_PERIPHCHUNKSIZE (1 << 13) /* Bit 13: Peripheral chunk size */ # define DMACH_FLAG_PERIPHCHUNKSIZE_1 (0) /* Peripheral chunksize = 1 */ # define DMACH_FLAG_PERIPHCHUNKSIZE_4 DMACH_FLAG_PERIPHCHUNKSIZE /* Peripheral chunksize = 4 */ /* Memory endpoint characteristics */ #define DMACH_FLAG_MEMPID_SHIFT (14) /* Bits 14-17: Memory PID */ #define DMACH_FLAG_MEMPID_MASK (15 << DMACH_FLAG_PERIPHPID_SHIFT) #define DMACH_FLAG_MEMH2SEL (1 << 18) /* Bits 18: HW handshaking */ #define DMACH_FLAG_MEMISPERIPH (1 << 19) /* Bits 19: 0=memory; 1=peripheral */ #define DMACH_FLAG_MEMWIDTH_SHIFT (20) /* Bits 20-21: Memory width */ #define DMACH_FLAG_MEMWIDTH_MASK (3 << DMACH_FLAG_MEMWIDTH_SHIFT) # define DMACH_FLAG_MEMWIDTH_8BITS (0 << DMACH_FLAG_MEMWIDTH_SHIFT) /* 8 bits */ # define DMACH_FLAG_MEMWIDTH_16BITS (1 << DMACH_FLAG_MEMWIDTH_SHIFT) /* 16 bits */ # define DMACH_FLAG_MEMWIDTH_32BITS (2 << DMACH_FLAG_MEMWIDTH_SHIFT) /* 32 bits */ #define DMACH_FLAG_MEMINCREMENT (1 << 22) /* Bit 22: Autoincrement memory address */ #define DMACH_FLAG_MEMCHUNKSIZE (1 << 22) /* Bit 23: Memory chunk size */ # define DMACH_FLAG_MEMCHUNKSIZE_1 (0) /* Memory chunksize = 1 */ # define DMACH_FLAG_MEMCHUNKSIZE_4 DMACH_FLAG_MEMCHUNKSIZE /* Memory chunksize = 4 */ /************************************************************************************ * Public Types ************************************************************************************/ typedef FAR void *DMA_HANDLE; typedef void (*dma_callback_t)(DMA_HANDLE handle, void *arg, int result); /* The following is used for sampling DMA registers when CONFIG DEBUG_DMA is selected */ #ifdef CONFIG_DEBUG_DMA struct sam_dmaregs_s { /* Global Registers */ uint32_t gcfg; /* DMAC Global Configuration Register */ uint32_t en; /* DMAC Enable Register */ uint32_t sreq; /* DMAC Software Single Request Register */ uint32_t creq; /* DMAC Software Chunk Transfer Request Register */ uint32_t last; /* DMAC Software Last Transfer Flag Register */ uint32_t ebcimr; /* DMAC Error Mask */ uint32_t ebcisr; /* DMAC Error Status */ uint32_t chsr; /* DMAC Channel Handler Status Register */ /* Channel Registers */ uint32_t saddr; /* DMAC Channel Source Address Register */ uint32_t daddr; /* DMAC Channel Destination Address Register */ uint32_t dscr; /* DMAC Channel Descriptor Address Register */ uint32_t ctrla; /* DMAC Channel Control A Register */ uint32_t ctrlb; /* DMAC Channel Control B Register */ uint32_t cfg; /* DMAC Channel Configuration Register */ }; #endif /************************************************************************************ * Inline Functions ************************************************************************************/ #ifndef __ASSEMBLY__ /************************************************************************************ * Public Data ************************************************************************************/ #undef EXTERN #if defined(__cplusplus) #define EXTERN extern "C" extern "C" { #else #define EXTERN extern #endif /************************************************************************************ * Public Function Prototypes ************************************************************************************/ /**************************************************************************** * Name: sam_dmachannel * * Description: * Allocate a DMA channel. This function sets aside a DMA channel with * the required FIFO size and flow control capabilities (determined by * dma_flags) then gives the caller exclusive access to the DMA channel. * * The naming convention in all of the DMA interfaces is that one side is * the 'peripheral' and the other is 'memory'. Howerver, the interface * could still be used if, for example, both sides were memory although * the naming would be awkward. * * Returned Value: * If a DMA channel if the required FIFO size is available, this function * returns a non-NULL, void* DMA channel handle. NULL is returned on any * failure. * ****************************************************************************/ DMA_HANDLE sam_dmachannel(uint32_t dmach_flags); /**************************************************************************** * Name: sam_dmafree * * Description: * Release a DMA channel. NOTE: The 'handle' used in this argument must * NEVER be used again until sam_dmachannel() is called again to re-gain * a valid handle. * * Returned Value: * None * ****************************************************************************/ void sam_dmafree(DMA_HANDLE handle); /**************************************************************************** * Name: sam_dmatxsetup * * Description: * Configure DMA for transmit of one buffer (memory to peripheral). This * function may be called multiple times to handle large and/or dis- * continuous transfers. Calls to sam_dmatxsetup() and sam_dmarxsetup() * must not be intermixed on the same transfer, however. * ****************************************************************************/ int sam_dmatxsetup(DMA_HANDLE handle, uint32_t paddr, uint32_t maddr, size_t nbytes); /**************************************************************************** * Name: sam_dmarxsetup * * Description: * Configure DMA for receipt of one buffer (peripheral to memory). This * function may be called multiple times to handle large and/or dis- * continuous transfers. Calls to sam_dmatxsetup() and sam_dmarxsetup() * must not be intermixed on the same transfer, however. * ****************************************************************************/ int sam_dmarxsetup(DMA_HANDLE handle, uint32_t paddr, uint32_t maddr, size_t nbytes); /**************************************************************************** * Name: sam_dmastart * * Description: * Start the DMA transfer * ****************************************************************************/ int sam_dmastart(DMA_HANDLE handle, dma_callback_t callback, void *arg); /**************************************************************************** * Name: sam_dmastop * * Description: * Cancel the DMA. After sam_dmastop() is called, the DMA channel is * reset and sam_dmarx/txsetup() must be called before sam_dmastart() can be * called again * ****************************************************************************/ void sam_dmastop(DMA_HANDLE handle); /**************************************************************************** * Name: sam_dmasample * * Description: * Sample DMA register contents * ****************************************************************************/ #ifdef CONFIG_DEBUG_DMA void sam_dmasample(DMA_HANDLE handle, struct sam_dmaregs_s *regs); #else # define sam_dmasample(handle,regs) #endif /**************************************************************************** * Name: sam_dmadump * * Description: * Dump previously sampled DMA register contents * ****************************************************************************/ #ifdef CONFIG_DEBUG_DMA void sam_dmadump(DMA_HANDLE handle, const struct sam_dmaregs_s *regs, const char *msg); #else # define sam_dmadump(handle,regs,msg) #endif #undef EXTERN #if defined(__cplusplus) } #endif #endif /* __ASSEMBLY__ */ #endif /* __ARCH_ARM_SRC_SAM34_SAM_DMAC_H */