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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2010-04-02 16:23:10 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2010-04-02 16:23:10 +0000 |
commit | 254b4a115e40ff6f0b160b12e6bf139a7f6b0532 (patch) | |
tree | f8844321cf121d5850ae5cdd569b14417d3fd139 /nuttx | |
parent | cb55abfbb0ad9ce15b3b1863f05ba209356ad69c (diff) | |
download | px4-nuttx-254b4a115e40ff6f0b160b12e6bf139a7f6b0532.tar.gz px4-nuttx-254b4a115e40ff6f0b160b12e6bf139a7f6b0532.tar.bz2 px4-nuttx-254b4a115e40ff6f0b160b12e6bf139a7f6b0532.zip |
DMA driver now compiles
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2569 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx')
-rwxr-xr-x | nuttx/arch/arm/src/sam3u/Make.defs | 19 | ||||
-rwxr-xr-x | nuttx/arch/arm/src/sam3u/sam3u_dmac.c | 409 | ||||
-rwxr-xr-x | nuttx/arch/arm/src/sam3u/sam3u_dmac.h | 6 | ||||
-rwxr-xr-x | nuttx/arch/arm/src/sam3u/sam3u_internal.h | 4 |
4 files changed, 242 insertions, 196 deletions
diff --git a/nuttx/arch/arm/src/sam3u/Make.defs b/nuttx/arch/arm/src/sam3u/Make.defs index 9f6f03e5f..44d618913 100755 --- a/nuttx/arch/arm/src/sam3u/Make.defs +++ b/nuttx/arch/arm/src/sam3u/Make.defs @@ -33,8 +33,12 @@ # ############################################################################ +# The start-up, "head", file + HEAD_ASRC = sam3u_vectors.S +# Common ARM and Cortex-M3 files + CMN_ASRCS = up_saveusercontext.S up_fullcontextrestore.S up_switchcontext.S CMN_CSRCS = up_assert.c up_blocktask.c up_copystate.c up_createstack.c \ up_mdelay.c up_udelay.c up_exit.c up_idle.c up_initialize.c \ @@ -44,8 +48,19 @@ CMN_CSRCS = up_assert.c up_blocktask.c up_copystate.c up_createstack.c \ up_sigdeliver.c up_unblocktask.c up_usestack.c up_doirq.c \ up_hardfault.c up_svcall.c +# Required SAM3U files + CHIP_ASRCS = CHIP_CSRCS = sam3u_allocateheap.c sam3u_clockconfig.c sam3u_gpioirq.c \ - sam3u_hsmci.c sam3u_irq.c sam3u_lowputc.c sam3u_pio.c \ - sam3u_serial.c sam3u_start.c sam3u_timerisr.c + sam3u_irq.c sam3u_lowputc.c sam3u_pio.c sam3u_serial.c \ + sam3u_start.c sam3u_timerisr.c + +# Configuration-dependent SAM3U files + +ifeq ($(CONFIG_SAM3U_DMA),y) +CHIP_CSRCS += sam3u_dmac.c +endif +ifeq ($(CONFIG_SAM3U_HSMCI),y) +CHIP_CSRCS += sam3u_hsmci.c +endif diff --git a/nuttx/arch/arm/src/sam3u/sam3u_dmac.c b/nuttx/arch/arm/src/sam3u/sam3u_dmac.c index 2a5253c8f..489d81bc1 100755 --- a/nuttx/arch/arm/src/sam3u/sam3u_dmac.c +++ b/nuttx/arch/arm/src/sam3u/sam3u_dmac.c @@ -41,6 +41,7 @@ #include <stdint.h> #include <stdbool.h> +#include <string.h> #include <semaphore.h> #include <debug.h> #include <errno.h> @@ -53,8 +54,10 @@ #include "up_internal.h" #include "os_internal.h" #include "chip.h" -#include "sam3u_dmac.h" + #include "sam3u_internal.h" +#include "sam3u_pmc.h" +#include "sam3u_dmac.h" /**************************************************************************** * Pre-processor Definitions @@ -73,7 +76,7 @@ #endif #if CONFIG_SAM3U_NLLDESC < CONFIG_SAM3U_NDMACHAN -# warning "At least CONFIG_SAM3U_NDMACHAN descriptors must be allocated */ +# warning "At least CONFIG_SAM3U_NDMACHAN descriptors must be allocated" # undef CONFIG_SAM3U_NLLDESC # define CONFIG_SAM3U_NLLDESC CONFIG_SAM3U_NDMACHAN @@ -84,7 +87,6 @@ #define DMACHAN_CTRLB_BOTHDSCR \ (DMACHAN_CTRLB_SRCDSCR | DMACHAN_CTRLB_DSTDSCR) - /**************************************************************************** * Private Types ****************************************************************************/ @@ -97,13 +99,11 @@ struct sam3u_dma_s bool inuse; /* TRUE: The DMA channel is in use */ uint32_t flags; /* DMA channel flags */ uint32_t base; /* DMA register channel base address */ + uint32_t cfg; /* Pre-calculated CFG register for transfer */ dma_callback_t callback; /* Callback invoked when the DMA completes */ void *arg; /* Argument passed to callback function */ - uint16_t bufsize; /* Transfer buffer size in bytes */ struct dma_linklist_s *llhead; /* DMA link list head */ struct dma_linklist_s *lltail; /* DMA link list head */ - volatile uint16_t remaining; /* Total number of bytes remaining to be transferred */ - int result; /* Transfer result (OK or negated errno) */ }; /**************************************************************************** @@ -157,17 +157,17 @@ static struct sam3u_dma_s g_dma[CONFIG_SAM3U_NDMACHAN] = { .chan = 0, - .flags = DMACH_FLAG_FIFO_8BYTES; + .flags = DMACH_FLAG_FIFO_8BYTES, .base = SAM3U_DMACHAN0_BASE, }, { .chan = 1, - .flags = DMACH_FLAG_FIFO_8BYTES; + .flags = DMACH_FLAG_FIFO_8BYTES, .base = SAM3U_DMACHAN1_BASE, }, { .chan = 2, - .flags = DMACH_FLAG_FIFO_8BYTES; + .flags = DMACH_FLAG_FIFO_8BYTES, .base = SAM3U_DMACHAN2_BASE, }, { @@ -211,7 +211,7 @@ static inline void sam3u_givechsem(void) (void)sem_post(&g_chsem); } -**************************************************************************** +/**************************************************************************** * Name: sam3u_takedsem() and sam3u_givedsem() * * Description: @@ -267,24 +267,70 @@ static unsigned int sam3u_fifosize(uint8_t dmach_flags) * ****************************************************************************/ -static inline boolean sam3u_flowcontrol(uint8_t dmach_flags) +static inline bool sam3u_flowcontrol(uint8_t dmach_flags) { return ((dmach_flags & DMACH_FLAG_FLOWCONTROL) != 0); } /**************************************************************************** - * Name: sam3u_flowcontrol + * Name: sam3u_fifocfg * * Description: * Decode the FIFO config from the flags * ****************************************************************************/ -static uint32_t sam3u_fifocfg(struct sam3u_dma_s *dmach) +static inline uint32_t sam3u_fifocfg(struct sam3u_dma_s *dmach) { unsigned int ndx = (dmach->flags & DMACH_FLAG_FIFOCFG_MASK) >> DMACH_FLAG_FIFOCFG_SHIFT; DEBUGASSERT(ndx < 3); - return sam3u_fifocfg[ndx]; + return g_fifocfg[ndx]; +} + +/**************************************************************************** + * Name: sam3u_txcfg + * + * Description: + * Decode the the flags to get the correct CFG register bit settings for + * a transmit (memory to peripheral) transfer. + * + ****************************************************************************/ + +static inline uint32_t sam3u_txcfg(struct sam3u_dma_s *dmach) +{ + uint32_t regval; + + /* Set transfer (memory to peripheral) DMA channel configuration register */ + + regval = (((dmach->flags & DMACH_FLAG_MEMPID_MASK) >> DMACH_FLAG_MEMPID_SHIFT) << DMACHAN_CFG_SRCPER_SHIFT); + regval |= (dmach->flags & DMACH_FLAG_MEMH2SEL) != 0 ? DMACHAN_CFG_SRCH2SEL : 0; + regval |= (((dmach->flags & DMACH_FLAG_PERIPHPID_MASK) >> DMACH_FLAG_PERIPHPID_SHIFT) << DMACHAN_CFG_DSTPER_SHIFT); + regval |= (dmach->flags & DMACH_FLAG_PERIPHH2SEL) != 0 ? DMACHAN_CFG_DSTH2SEL : 0; + regval |= sam3u_fifocfg(dmach); + return regval; +} + +/**************************************************************************** + * Name: sam3u_rxcfg + * + * Description: + * Decode the the flags to get the correct CFG register bit settings for + * a receive (peripheral to memory) transfer. + * + ****************************************************************************/ + +static inline uint32_t sam3u_rxcfg(struct sam3u_dma_s *dmach) +{ + uint32_t regval; + + /* Set received (peripheral to memory) DMA channel config */ + + regval = (((dmach->flags & DMACH_FLAG_PERIPHPID_MASK) >> DMACH_FLAG_PERIPHPID_SHIFT) << DMACHAN_CFG_SRCPER_SHIFT); + regval |= (dmach->flags & DMACH_FLAG_PERIPHH2SEL) != 0 ? DMACHAN_CFG_SRCH2SEL : 0; + regval |= (((dmach->flags & DMACH_FLAG_MEMPID_MASK) >> DMACH_FLAG_MEMPID_SHIFT) << DMACHAN_CFG_DSTPER_SHIFT); + regval |= (dmach->flags & DMACH_FLAG_MEMH2SEL) != 0 ? DMACHAN_CFG_DSTH2SEL : 0; + regval |= sam3u_fifocfg(dmach); + return regval; } /**************************************************************************** @@ -359,7 +405,8 @@ sam3u_txctrlabits(struct sam3u_dma_s *dmach) * ****************************************************************************/ -static inline uint32_t sam3u_txctrla(uint32_t dmasize, uint32_t txctrlabits) +static inline uint32_t sam3u_txctrla(struct sam3u_dma_s *dmach, + uint32_t dmasize, uint32_t txctrlabits) { /* Set the buffer transfer size field. This is the number of transfers to * be performed, that is, the number of source width transfers to perform. @@ -379,7 +426,7 @@ static inline uint32_t sam3u_txctrla(uint32_t dmasize, uint32_t txctrlabits) } /**************************************************************************** - * Name: sam3u_setrxctrla + * Name: sam3u_rxctrlabits * * Description: * Decode the the flags to get the correct CTRLA register bit settings for @@ -389,8 +436,7 @@ static inline uint32_t sam3u_txctrla(uint32_t dmasize, uint32_t txctrlabits) * ****************************************************************************/ -static inline uint32_t -sam3u_setrxctrla(struct sam3u_dma_s *dmach) +static inline uint32_t sam3u_rxctrlabits(struct sam3u_dma_s *dmach) { uint32_t regval; unsigned int ndx; @@ -450,7 +496,8 @@ sam3u_setrxctrla(struct sam3u_dma_s *dmach) * ****************************************************************************/ -static inline uint32_t sam3u_rxctrla(uint32_t dmasize, uint32_t txctrlabits) +static inline uint32_t sam3u_rxctrla(struct sam3u_dma_s *dmach, + uint32_t dmasize, uint32_t txctrlabits) { /* Set the buffer transfer size field. This is the number of transfers to * be performed, that is, the number of source width transfers to perform. @@ -478,7 +525,7 @@ static inline uint32_t sam3u_rxctrla(uint32_t dmasize, uint32_t txctrlabits) * ****************************************************************************/ -static inline void sam3u_txctrlb(struct sam3u_dma_s *dmach) +static inline uint32_t sam3u_txctrlb(struct sam3u_dma_s *dmach) { uint32_t regval; @@ -543,7 +590,7 @@ static inline void sam3u_txctrlb(struct sam3u_dma_s *dmach) if ((dmach->flags & DMACH_FLAG_PERIPHINCREMENT) == 0) { - regval |= DMACHAN_CTRLB_DESTINCR_FIXED; + regval |= DMACHAN_CTRLB_DSTINCR_FIXED; } return regval; } @@ -557,7 +604,7 @@ static inline void sam3u_txctrlb(struct sam3u_dma_s *dmach) * ****************************************************************************/ -static inline void sam3u_rxctrlb(struct sam3u_dma_s *dmach) +static inline uint32_t sam3u_rxctrlb(struct sam3u_dma_s *dmach) { uint32_t regval; @@ -613,39 +660,21 @@ static inline void sam3u_rxctrlb(struct sam3u_dma_s *dmach) /* Select source address incrementing */ - if (dmach->flags & DMACH_FLAG_PERIPHINCREMENT) == 0) + if ((dmach->flags & DMACH_FLAG_PERIPHINCREMENT) == 0) { regval |= DMACHAN_CTRLB_SRCINCR_FIXED; } /* Select address incrementing */ - if (dmach->flags & DMACH_FLAG_MEMINCREMENT) 0= 0) + if ((dmach->flags & DMACH_FLAG_MEMINCREMENT) == 0) { - regval |= DMACHAN_CTRLB_DESTINCR_FIXED; + regval |= DMACHAN_CTRLB_DSTINCR_FIXED; } return regval; } /**************************************************************************** - * Name: sam3u_flowcontrol - * - * Description: - * Select flow control - * - ****************************************************************************/ - -static inline void sam3u_flowcontrol(struct sam3u_dma_s *dmach, uint32_t setting) -{ - uint32_t regval; - - regval = getreg32(dmach->base + SAM3U_DMACHAN_CTRLB_OFFSET); - regval &= ~(DMACHAN_CTRLB_FC_MASK); - regval |= setting; - putreg(regval, dmach->base + SAM3U_DMACHAN_CTRLB_OFFSET); -} - -/**************************************************************************** * Name: sam3u_allocdesc * * Description: @@ -661,7 +690,7 @@ static inline void sam3u_flowcontrol(struct sam3u_dma_s *dmach, uint32_t setting static struct dma_linklist_s * sam3u_allocdesc(struct sam3u_dma_s *dmach, struct dma_linklist_s *prev, - uint23_t src, uint32_t dest, uint32_t ctrla, uint32_t ctrlb) + uint32_t src, uint32_t dest, uint32_t ctrla, uint32_t ctrlb) { struct dma_linklist_s *desc = NULL; int i; @@ -698,7 +727,7 @@ sam3u_allocdesc(struct sam3u_dma_s *dmach, struct dma_linklist_s *prev, desc->dest = dest; /* Destination address */ desc->ctrla = ctrla; /* Control A value */ desc->ctrlb = ctrlb; /* Control B value */ - desc->desc = 0; /* Descriptor address */ + desc->next = 0; /* Next descriptor address */ /* And then hook it at the tail of the link list */ @@ -737,10 +766,6 @@ sam3u_allocdesc(struct sam3u_dma_s *dmach, struct dma_linklist_s *prev, desc->ctrlb |= DMACHAN_CTRLB_BOTHDSCR; dmach->lltail = desc; - - /* Increment the total number of bytes to be transferred */ - - dmach->bufsize += nbytes; break; } } @@ -774,15 +799,10 @@ static void sam3u_freelinklist(struct sam3u_dma_s *dmach) * channel */ - desc = dmach->llhead + desc = dmach->llhead; dmach->llhead = NULL; dmach->lltail = NULL; - /* No transfer in progress */ - - dmach->remaining = 0; - dmach->bufsize = 0; - /* Reset each descriptor in the link list (thereby freeing them) */ while (desc != NULL) @@ -818,15 +838,15 @@ static int sam3u_txbuffer(struct sam3u_dma_s *dmach, uint32_t paddr, if (dmach->llhead) { - regval = dmach->llhead.ctrla; - ctrlb = dmach->llhead.ctrlb; + regval = dmach->llhead->ctrla; + ctrlb = dmach->llhead->ctrlb; } else { regval = sam3u_txctrlabits(dmach); - ctrla = sam3u_txctrlb(dmach); + ctrlb = sam3u_txctrlb(dmach); } - ctrla = sam3u_txctrla(regval, nbytes); + ctrla = sam3u_txctrla(dmach, regval, nbytes); /* Add the new link list entry */ @@ -834,6 +854,12 @@ static int sam3u_txbuffer(struct sam3u_dma_s *dmach, uint32_t paddr, { return -ENOMEM; } + + /* Pre-calculate the transmit CFG register setting (it won't be used until + * the DMA is started). + */ + + dmach->cfg = sam3u_txcfg(dmach); return OK; } @@ -860,22 +886,28 @@ static int sam3u_rxbuffer(struct sam3u_dma_s *dmach, uint32_t paddr, if (dmach->llhead) { - regval = dmach->llhead.ctrla; - ctrlb = dmach->llhead.ctrlb; + regval = dmach->llhead->ctrla; + ctrlb = dmach->llhead->ctrlb; } else { regval = sam3u_rxctrlabits(dmach); ctrlb = sam3u_rxctrlb(dmach); } - ctrla = sam3u_rxctrla(regval, nbytes); + ctrla = sam3u_rxctrla(dmach, regval, nbytes); /* Add the new link list entry */ - if (!sam3u_allocdesc(dmach, dmach->lltail, maddr, paddr, ctrla, ctrlb)) + if (!sam3u_allocdesc(dmach, dmach->lltail, paddr, maddr, ctrla, ctrlb)) { return -ENOMEM; } + + /* Pre-calculate the receive CFG register setting (it won't be used until + * the DMA is started). + */ + + dmach->cfg = sam3u_rxcfg(dmach); return OK; } @@ -889,12 +921,6 @@ static int sam3u_rxbuffer(struct sam3u_dma_s *dmach, uint32_t paddr, static inline int sam3u_single(struct sam3u_dma_s *dmach) { - -Transfer Type AUTO SRC_REP DST_REP SRC_DSCR DST_DSCR BTSIZE SADDR DADDR Other - 1) Single Buffer or Last 0 – – 1 1 USR USR USR USR -buffer of a multiple buffer -transfer - struct dma_linklist_s *llhead = dmach->llhead; /* Clear any pending interrupts from any previous DMAC transfer by reading @@ -925,22 +951,25 @@ transfer DEBUGASSERT((llhead->ctrlb & DMACHAN_CTRLB_BOTHDSCR) == DMACHAN_CTRLB_BOTHDSCR); /* Set up the CFG register */ - #error missing logic + + putreg32(dmach->cfg, dmach->base + SAM3U_DMACHAN_CFG_OFFSET); + /* Enable the channel by writing a ‘1’ to the CHER enable bit */ - #error missing logic - - /* Make sure that bit 0 of the EN register is enabled */ - -5. Source and destination request single and chunk DMAC transactions to transfer the - buffer of data (assuming non-memory peripherals). The DMAC acknowledges at the - completion of every transaction (chunk and single) in the buffer and carry out the buffer - transfer. -6. Once the transfer completes, hardware sets the interrupts and disables the channel. At - this time you can either respond to the buffer Complete or Transfer Complete interrupts, - or poll for the Channel Handler Status Register (DMAC_CHSR.ENABLE[n]) bit until it is - cleared by hardware, to detect when the transfer is complete. -} + putreg32(DMAC_CHER_ENA(dmach->chan), SAM3U_DMAC_CHER); + + /* The DMA has been started. Once the transfer completes, hardware sets the + * interrupts and disables the channel. We will received buffer complete and + * transfer complete interrupts. + * + * Enable error, buffer complete and transfer complete interrupts. + * (Since there is only a single buffer, we don't need the buffer complete + * interrupt). + */ + + putreg32(DMAC_EBC_CBTCINTS(dmach->chan), SAM3U_DMAC_EBCIER); + return OK; +} /**************************************************************************** * Name: sam3u_multiple @@ -952,13 +981,6 @@ transfer static inline int sam3u_multiple(struct sam3u_dma_s *dmach) { -Transfer Type AUTO SRC_REP DST_REP SRC_DSCR DST_DSCR BTSIZE SADDR DADDR Other - 1) Single Buffer or Last 0 – – 1 1 USR USR USR USR -buffer of a multiple buffer -transfer - 4) Multi Buffer transfer 0 – – 0 0 LLI LLI LLI LLI -with LLI support - struct dma_linklist_s *llhead = dmach->llhead; DEBUGASSERT(llhead != NULL && llhead->src != 0); @@ -966,11 +988,7 @@ with LLI support /* Check the first and last CTRLB values */ DEBUGASSERT((llhead->ctrlb & DMACHAN_CTRLB_BOTHDSCR) == 0); - DEBUGASSERT((lltail->ctrlb & DMACHAN_CTRLB_BOTHDSCR) == DMACHAN_CTRLB_BOTHDSCR); - - /* Write the channel configuration information into the CFG register */ - -#error missing logic + DEBUGASSERT((dmach->lltail->ctrlb & DMACHAN_CTRLB_BOTHDSCR) == DMACHAN_CTRLB_BOTHDSCR); /* Clear any pending interrupts from any previous DMAC transfer by reading the * status register @@ -982,50 +1000,69 @@ with LLI support putreg32(llhead->ctrlb, dmach->base + SAM3U_DMACHAN_CTRLA_OFFSET); -/* Program the DMAC_CTRLBx, DMAC_CFGx registers according to Row 4 as shown in - Table 40-1 on page 1060. */ - #error missing logic + /* Set up the CTRLB register */ + + putreg32(llhead->ctrlb, dmach->base + SAM3U_DMACHAN_CTRLA_OFFSET); + + /* Write the channel configuration information into the CFG register */ + + putreg32(dmach->cfg, dmach->base + SAM3U_DMACHAN_CFG_OFFSET); /* Program the DSCR register with the pointer to the firstlink list entry. */ - putreg32((uint32_t)dmach->llhead, dmac->base + SAM3U_DMACHAN_DSCR_OFFSET); - - #error missing logic - -/* Finally, enable the channel by writing a ‘1’ to the CHER enable */ - #error missing logic - -14. The DMAC fetches the first LLI from the location pointed to by DMAC_DSCRx(0). - Note: The LLI.DMAC_SADDRx, LLI. DMAC_DADDRx, LLI.DMAC_DSCRx, LLI.DMAC_CTRLAx and - LLI.DMAC_CTRLBx registers are fetched. The DMAC automatically reprograms the - DMAC_SADDRx, DMAC_DADDRx, DMAC_DSCRx, DMAC_CTRLBx and DMAC_CTRLAx channel - registers from the DMAC_DSCRx(0). - -15. Source and destination request single and chunk DMAC transactions to transfer the - buffer of data (assuming non-memory peripheral). The DMAC acknowledges at the - completion of every transaction (chunk and single) in the buffer and carry out the buffer - transfer. - -16. Once the buffer of data is transferred, the DMAC_CTRLAx register is written out to system - memory at the same location and on the same layer where it was originally - fetched, that is, the location of the DMAC_CTRLAx register of the linked list item - fetched prior to the start of the buffer transfer. Only DMAC_CTRLAx register is written - out because only the DMAC_CTRLAx.BTSIZE and DMAC_CTRLAX.DONE bits have - been updated by DMAC hardware. Additionally, the DMAC_CTRLAx.DONE bit is - asserted when the buffer transfer has completed. - Note: Do not poll the DMAC_CTRLAx.DONE bit in the DMAC memory map. Instead, poll the - LLI.DMAC_CTRLAx.DONE bit in the LLI for that buffer. If the poll LLI.DMAC_CTRLAx.DONE bit is - asserted, then this buffer transfer has completed. This LLI.DMAC_CTRLAx.DONE bit was cleared - at the start of the transfer. -17. The DMAC does not wait for the buffer interrupt to be cleared, but continues fetching - the next LLI from the memory location pointed to by current DMAC_DSCRx register - and automatically reprograms the DMAC_SADDRx, DMAC_DADDRx, DMAC_DSCRx, - DMAC_CTRLAx and DMAC_CTRLBx channel registers. The DMAC transfer continues - until the DMAC determines that the DMAC_CTRLBx and DMAC_DSCRx registers at - the end of a buffer transfer match described in Row 1 of Table 40-1 on page 1060. The - DMAC then knows that the previous buffer transferred was the last buffer in the DMAC - transfer. The DMAC transfer might look like that shown in Figure 40-5 on page 1064 + putreg32((uint32_t)llhead, dmach->base + SAM3U_DMACHAN_DSCR_OFFSET); + + /* Finally, enable the channel by writing a ‘1’ to the CHER enable */ + + putreg32(DMAC_CHER_ENA(dmach->chan), SAM3U_DMAC_CHER); + + /* As each buffer of data is transferred, the CTRLA register is written back + * into the link list entry. The CTRLA contains updated BTSIZE and DONE bits. + * Additionally, the CTRLA DONE bit is asserted when the buffer transfer has completed. + * + * The DMAC transfer continues until the CTRLB register disables the descriptor + * (DSCR bits) registers at the final buffer tranfer. + * + * Enable error, buffer complete and transfer complete interrupts. We + * don't really need the buffer complete interrupts, but we will take them + * just to handle stall conditions. + */ + + putreg32(DMAC_EBC_CHANINTS(dmach->chan), SAM3U_DMAC_EBCIER); + return OK; +} + +/**************************************************************************** + * Name: sam3u_dmasterminate + * + * Description: + * Terminate the DMA transfer and disable the DMA channel + * + ****************************************************************************/ + +static void sam3u_dmaterminate(struct sam3u_dma_s *dmach, int result) +{ + /* Disable all channel interrupts */ + + putreg32(DMAC_EBC_CHANINTS(dmach->chan), SAM3U_DMAC_EBCIDR); + + /* Disable the channel by writing one to the write-only channel disable register */ + + putreg32(DMAC_CHDR_DIS(dmach->chan), SAM3U_DMAC_CHDR); + + /* Free the linklist */ + + sam3u_freelinklist(dmach); + + /* Perform the DMA complete callback */ + + if (dmach->callback) + { + dmach->callback((DMA_HANDLE)dmach, dmach->arg, result); + } + dmach->callback = NULL; + dmach->arg = NULL; } /**************************************************************************** @@ -1038,55 +1075,53 @@ with LLI support static int sam3u_dmainterrupt(int irq, void *context) { - struct sam3u_dma_s *dmach; + struct sam3u_dma_s *dmach; unsigned int chndx; uint32_t regval; - /* Get the DMAC status register value */ + /* Get the DMAC status register value. Ignore all masked interrupt + * status bits. + */ - regval = getreg32(SAM3U_DMAC_EBCISR); + regval = getreg32(SAM3U_DMAC_EBCISR) & getreg32(SAM3U_DMAC_EBCIMR); - /* Check if the any buffer transfer has completed */ + /* Check if the any transfer has completed */ if (regval & DMAC_EBC_BTC_MASK) { - /* Check each channel status */ + /* Yes.. Check each bit to see which channel has interrupted */ - for (chndx = 0; chndx < DMA_CHANNEL_NUM; chndx++) + for (chndx = 0; chndx < CONFIG_SAM3U_NDMACHAN; chndx++) { - /* Are interrupts enabled for this channel? */ + /* Are any interrupts pending for this channel? */ - if ((regval & DMAC_EBC_BTC(chndx)) != 0) + if ((regval & DMAC_EBC_CHANINTS(chndx)) != 0) { - /* Subtract the number of bytes transferred so far */ - - dmach->remaining -= dmach->bufsize ???????; + dmach = &g_dma[chndx]; - /* Is the transfer finished? */ - - if (dmach->remaining == 0) - { - /* Disable Buffer Transfer Complete interrupts */ + /* Yes.. Did an error occur? */ - dmach = &g_dma[chndx]; - putreg32(DMAC_EBC_BTC(dmach->chan), SAM3U_DMAC_EBCIDR); + if ((regval & DMAC_EBC_ERR(chndx)) != 0) + { + /* Yes... Terminate the transfer with an error? */ - /* Disable the DMA channel */ + sam3u_dmaterminate(dmach, -EIO); + } - putreg32(DMAC_CHDR_DIS(dmach->chan), SAM3U_DMAC_CHDR); - - /* Free the linklist */ - - sam3u_freelinklist(dmach); + /* Is the transfer complete? */ - /* Perform the DMA complete callback */ + else if ((regval & DMAC_EBC_CBTC(chndx)) != 0) + { + /* Yes.. Terminate the transfer with success */ - if (dmach->callback) - { - dmach->callback(dmach->arg, dmach->result); - } + sam3u_dmaterminate(dmach, OK); } - else + + /* Otherwise, this must be a Bufffer Transfer Complete (BTC) + * interrupt as part of a multiple buffer transfer. + */ + + else /* f ((regval & DMAC_EBC_BTC(chndx)) != 0) */ { /* Write the KEEPON field to clear the STALL states */ @@ -1121,7 +1156,7 @@ void weak_function up_dmainitialize(void) /* Disable all DMA interrupts */ - putreg32(DMAC_DBC_ERR_ALLINTS, SAM3U_DMAC_EBCIDR); + putreg32(DMAC_EBC_ALLINTS, SAM3U_DMAC_EBCIDR); /* Disable all DMA channels */ @@ -1141,8 +1176,8 @@ void weak_function up_dmainitialize(void) /* Initialize semaphores */ - sem_init(g_chsem, 0, 1); - sem_init(g_chsem, 0, CONFIG_SAM3U_NDMACHAN); + sem_init(&g_chsem, 0, 1); + sem_init(&g_chsem, 0, CONFIG_SAM3U_NDMACHAN); } /**************************************************************************** @@ -1165,11 +1200,10 @@ void weak_function up_dmainitialize(void) * ****************************************************************************/ -DMA_HANDLE sam3u_dmachannel(uint16_t dmach_flags) +DMA_HANDLE sam3u_dmachannel(uint32_t dmach_flags) { struct sam3u_dma_s *dmach; unsigned int chndx; - uint32_t regval; /* Get the search parameters */ @@ -1210,11 +1244,7 @@ DMA_HANDLE sam3u_dmachannel(uint16_t dmach_flags) */ dmach->flags &= (DMACH_FLAG_FLOWCONTROL | DMACH_FLAG_FIFOSIZE_MASK); - dmach->flags |= (dma_flags & ~((DMACH_FLAG_FLOWCONTROL | DMACH_FLAG_FIFOSIZE_MASK))); - - /* Initialize the transfer state */ - - dmach->remaining = 0; + dmach->flags |= (dmach_flags & ~((DMACH_FLAG_FLOWCONTROL | DMACH_FLAG_FIFOSIZE_MASK))); break; } } @@ -1254,19 +1284,17 @@ void sam3u_dmafree(DMA_HANDLE handle) * 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 sam3u_dmatxsetup() and sam3u_dmatxsetup() + * continuous transfers. Calls to sam3u_dmatxsetup() and sam3u_dmarxsetup() * must not be intermixed on the same transfer, however. * ****************************************************************************/ -int sam3u_dmarxsetup(DMA_HANDLE handle, uint32_t paddr, uint32_t maddr, size_t nbytes) +int sam3u_dmatxsetup(DMA_HANDLE handle, uint32_t paddr, uint32_t maddr, size_t nbytes) { struct sam3u_dma_s *dmach = (struct sam3u_dma_s *)handle; - uint32_t regval; int ret = OK; DEBUGASSERT(dmach && dmach->llhead != NULL && dmach->lltail != 0); - DEBUGASSERT(dmach->remaining == 0); /* If this is a large transfer, break it up into smaller buffers */ @@ -1285,12 +1313,12 @@ int sam3u_dmarxsetup(DMA_HANDLE handle, uint32_t paddr, uint32_t maddr, size_t n * do do). */ - if (dmach->flags & DMACH_FLAG_PERIPHINCREMENT) != 0) + if ((dmach->flags & DMACH_FLAG_PERIPHINCREMENT) != 0) { paddr += DMACHAN_CTRLA_BTSIZE_MAX; } - if (dmach->flags & DMACH_FLAG_MEMINCREMENT) != 0) + if ((dmach->flags & DMACH_FLAG_MEMINCREMENT) != 0) { maddr += DMACHAN_CTRLA_BTSIZE_MAX; } @@ -1303,6 +1331,7 @@ int sam3u_dmarxsetup(DMA_HANDLE handle, uint32_t paddr, uint32_t maddr, size_t n { ret = sam3u_txbuffer(dmach, paddr, maddr, nbytes); } + return ret; } /**************************************************************************** @@ -1311,7 +1340,7 @@ int sam3u_dmarxsetup(DMA_HANDLE handle, uint32_t paddr, uint32_t maddr, size_t n * 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 sam3u_dmatxsetup() and sam3u_dmatxsetup() + * continuous transfers. Calls to sam3u_dmatxsetup() and sam3u_dmarxsetup() * must not be intermixed on the same transfer, however. * ****************************************************************************/ @@ -1319,7 +1348,6 @@ int sam3u_dmarxsetup(DMA_HANDLE handle, uint32_t paddr, uint32_t maddr, size_t n int sam3u_dmarxsetup(DMA_HANDLE handle, uint32_t paddr, uint32_t maddr, size_t nbytes) { struct sam3u_dma_s *dmach = (struct sam3u_dma_s *)handle; - uint32_t regval; int ret = OK; DEBUGASSERT(dmach && dmach->llhead != NULL && dmach->lltail != 0); @@ -1341,12 +1369,12 @@ int sam3u_dmarxsetup(DMA_HANDLE handle, uint32_t paddr, uint32_t maddr, size_t n * do do). */ - if (dmach->flags & DMACH_FLAG_PERIPHINCREMENT) != 0) + if ((dmach->flags & DMACH_FLAG_PERIPHINCREMENT) != 0) { paddr += DMACHAN_CTRLA_BTSIZE_MAX; } - if (dmach->flags & DMACH_FLAG_MEMINCREMENT) != 0) + if ((dmach->flags & DMACH_FLAG_MEMINCREMENT) != 0) { maddr += DMACHAN_CTRLA_BTSIZE_MAX; } @@ -1359,6 +1387,7 @@ int sam3u_dmarxsetup(DMA_HANDLE handle, uint32_t paddr, uint32_t maddr, size_t n { ret = sam3u_rxbuffer(dmach, paddr, maddr, nbytes); } + return ret; } /**************************************************************************** @@ -1408,19 +1437,17 @@ int sam3u_dmastart(DMA_HANDLE handle, dma_callback_t callback, void *arg) * reset and sam3u_dmasetup() must be called before sam3u_dmastart() can be * called again * - * Assumptions: - * - DMA handle allocated by sam3u_dmachannel() - * ****************************************************************************/ void sam3u_dmastop(DMA_HANDLE handle) { struct sam3u_dma_s *dmach = (struct sam3u_dma_s *)handle; - - /* Disable the channel by writing one to the write-only channel disable register */ + irqstate_t flags; DEBUGASSERT(dmach != NULL); - putreg32(DMAC_CHDR_DIS(dmach->chan), SAM3U_DMAC_CHDR); + flags = irqsave(); + sam3u_dmaterminate(dmach, -EINTR); + irqrestore(flags); } /**************************************************************************** diff --git a/nuttx/arch/arm/src/sam3u/sam3u_dmac.h b/nuttx/arch/arm/src/sam3u/sam3u_dmac.h index 8a8758481..523eaf686 100755 --- a/nuttx/arch/arm/src/sam3u/sam3u_dmac.h +++ b/nuttx/arch/arm/src/sam3u/sam3u_dmac.h @@ -263,7 +263,11 @@ # define DMAC_EBC_ERR1 (1 << (DMAC_EBC_ERR_SHIFT+1))
# define DMAC_EBC_ERR2 (1 << (DMAC_EBC_ERR_SHIFT+2))
# define DMAC_EBC_ERR3 (1 << (DMAC_EBC_ERR_SHIFT+3))
-#define DMAC_DBC_ERR_ALLINTS (0x000f0f0f)
+
+#define DMAC_EBC_BTCINTS(n) (0x00010001 << (n)) /* BTC + ERR interrupts */
+#define DMAC_EBC_CBTCINTS(n) (0x00010100 << (n)) /* CBT + ERR interrupts */
+#define DMAC_EBC_CHANINTS(n) (0x00010101 << (n)) /* All channel interrupts */
+#define DMAC_EBC_ALLINTS (0x000f0f0f) /* All interrupts */
/* DMAC Channel Handler Enable Register */
diff --git a/nuttx/arch/arm/src/sam3u/sam3u_internal.h b/nuttx/arch/arm/src/sam3u/sam3u_internal.h index 67c1bafca..a0b0837d7 100755 --- a/nuttx/arch/arm/src/sam3u/sam3u_internal.h +++ b/nuttx/arch/arm/src/sam3u/sam3u_internal.h @@ -566,8 +566,8 @@ EXTERN void sam3u_dmafree(DMA_HANDLE handle); * ****************************************************************************/ -EXTERN void sam3u_dmatxsetup(DMA_HANDLE handle, uint32_t paddr, uint32_t maddr, - size_t nbytes); +EXTERN int sam3u_dmatxsetup(DMA_HANDLE handle, uint32_t paddr, uint32_t maddr, + size_t nbytes); /**************************************************************************** * Name: sam3u_dmarxsetup |