sergiotarxz/nuttx
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

DMA driver now compiles

Browse Source 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2569 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2010-04-02 16:23:10 +00:00
parent 6ea90bb7b8
commit 38b8ec5a20
4 changed files with 238 additions and 192 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
arch/arm/src/sam3u/Make.defs
View File

@ -33,8 +33,12 @@
# #
############################################################################ ############################################################################
# The start-up, "head", file
HEAD_ASRC = sam3u_vectors.S HEAD_ASRC = sam3u_vectors.S
# Common ARM and Cortex-M3 files
CMN_ASRCS = up_saveusercontext.S up_fullcontextrestore.S up_switchcontext.S 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 \ 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 \ 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_sigdeliver.c up_unblocktask.c up_usestack.c up_doirq.c \
up_hardfault.c up_svcall.c up_hardfault.c up_svcall.c
# Required SAM3U files
CHIP_ASRCS = CHIP_ASRCS =
CHIP_CSRCS = sam3u_allocateheap.c sam3u_clockconfig.c sam3u_gpioirq.c \ CHIP_CSRCS = sam3u_allocateheap.c sam3u_clockconfig.c sam3u_gpioirq.c \
sam3u_hsmci.c sam3u_irq.c sam3u_lowputc.c sam3u_pio.c \ sam3u_irq.c sam3u_lowputc.c sam3u_pio.c sam3u_serial.c \
sam3u_serial.c sam3u_start.c sam3u_timerisr.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

395
arch/arm/src/sam3u/sam3u_dmac.c
View File

@ -41,6 +41,7 @@
#include <stdint.h> #include <stdint.h>
#include <stdbool.h> #include <stdbool.h>
#include <string.h>
#include <semaphore.h> #include <semaphore.h>
#include <debug.h> #include <debug.h>
#include <errno.h> #include <errno.h>
@ -53,8 +54,10 @@
#include "up_internal.h" #include "up_internal.h"
#include "os_internal.h" #include "os_internal.h"
#include "chip.h" #include "chip.h"
#include "sam3u_dmac.h"
#include "sam3u_internal.h" #include "sam3u_internal.h"
#include "sam3u_pmc.h"
#include "sam3u_dmac.h"
/**************************************************************************** /****************************************************************************
* Pre-processor Definitions * Pre-processor Definitions
@ -73,7 +76,7 @@
#endif #endif
#if CONFIG_SAM3U_NLLDESC < CONFIG_SAM3U_NDMACHAN #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 # undef CONFIG_SAM3U_NLLDESC
# define CONFIG_SAM3U_NLLDESC CONFIG_SAM3U_NDMACHAN # define CONFIG_SAM3U_NLLDESC CONFIG_SAM3U_NDMACHAN
@ -84,7 +87,6 @@
#define DMACHAN_CTRLB_BOTHDSCR \ #define DMACHAN_CTRLB_BOTHDSCR \
(DMACHAN_CTRLB_SRCDSCR | DMACHAN_CTRLB_DSTDSCR) (DMACHAN_CTRLB_SRCDSCR | DMACHAN_CTRLB_DSTDSCR)
/**************************************************************************** /****************************************************************************
* Private Types * Private Types
****************************************************************************/ ****************************************************************************/
@ -97,13 +99,11 @@ struct sam3u_dma_s
bool inuse; /* TRUE: The DMA channel is in use */ bool inuse; /* TRUE: The DMA channel is in use */
uint32_t flags; /* DMA channel flags */ uint32_t flags; /* DMA channel flags */
uint32_t base; /* DMA register channel base address */ 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 */ dma_callback_t callback; /* Callback invoked when the DMA completes */
void *arg; /* Argument passed to callback function */ 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 *llhead; /* DMA link list head */
struct dma_linklist_s *lltail; /* 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, .chan = 0,
.flags = DMACH_FLAG_FIFO_8BYTES; .flags = DMACH_FLAG_FIFO_8BYTES,
.base = SAM3U_DMACHAN0_BASE, .base = SAM3U_DMACHAN0_BASE,
}, },
{ {
.chan = 1, .chan = 1,
.flags = DMACH_FLAG_FIFO_8BYTES; .flags = DMACH_FLAG_FIFO_8BYTES,
.base = SAM3U_DMACHAN1_BASE, .base = SAM3U_DMACHAN1_BASE,
}, },
{ {
.chan = 2, .chan = 2,
.flags = DMACH_FLAG_FIFO_8BYTES; .flags = DMACH_FLAG_FIFO_8BYTES,
.base = SAM3U_DMACHAN2_BASE, .base = SAM3U_DMACHAN2_BASE,
}, },
{ {
@ -211,7 +211,7 @@ static inline void sam3u_givechsem(void)
(void)sem_post(&g_chsem); (void)sem_post(&g_chsem);
} }
**************************************************************************** /****************************************************************************
* Name: sam3u_takedsem() and sam3u_givedsem() * Name: sam3u_takedsem() and sam3u_givedsem()
* *
* Description: * 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); return ((dmach_flags & DMACH_FLAG_FLOWCONTROL) != 0);
} }
/**************************************************************************** /****************************************************************************
* Name: sam3u_flowcontrol * Name: sam3u_fifocfg
* *
* Description: * Description:
* Decode the FIFO config from the flags * 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; unsigned int ndx = (dmach->flags & DMACH_FLAG_FIFOCFG_MASK) >> DMACH_FLAG_FIFOCFG_SHIFT;
DEBUGASSERT(ndx < 3); 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 /* 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. * 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: * Description:
* Decode the the flags to get the correct CTRLA register bit settings for * 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 static inline uint32_t sam3u_rxctrlabits(struct sam3u_dma_s *dmach)
sam3u_setrxctrla(struct sam3u_dma_s *dmach)
{ {
uint32_t regval; uint32_t regval;
unsigned int ndx; 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 /* 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. * 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; uint32_t regval;
@ -543,7 +590,7 @@ static inline void sam3u_txctrlb(struct sam3u_dma_s *dmach)
if ((dmach->flags & DMACH_FLAG_PERIPHINCREMENT) == 0) if ((dmach->flags & DMACH_FLAG_PERIPHINCREMENT) == 0)
{ {
regval |= DMACHAN_CTRLB_DESTINCR_FIXED; regval |= DMACHAN_CTRLB_DSTINCR_FIXED;
} }
return regval; 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; uint32_t regval;
@ -613,38 +660,20 @@ static inline void sam3u_rxctrlb(struct sam3u_dma_s *dmach)
/* Select source address incrementing */ /* Select source address incrementing */
if (dmach->flags & DMACH_FLAG_PERIPHINCREMENT) == 0) if ((dmach->flags & DMACH_FLAG_PERIPHINCREMENT) == 0)
{ {
regval |= DMACHAN_CTRLB_SRCINCR_FIXED; regval |= DMACHAN_CTRLB_SRCINCR_FIXED;
} }
/* Select address incrementing */ /* 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; 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 * Name: sam3u_allocdesc
* *
@ -661,7 +690,7 @@ static inline void sam3u_flowcontrol(struct sam3u_dma_s *dmach, uint32_t setting
static struct dma_linklist_s * static struct dma_linklist_s *
sam3u_allocdesc(struct sam3u_dma_s *dmach, struct dma_linklist_s *prev, 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; struct dma_linklist_s *desc = NULL;
int i; int i;
@ -698,7 +727,7 @@ sam3u_allocdesc(struct sam3u_dma_s *dmach, struct dma_linklist_s *prev,
desc->dest = dest; /* Destination address */ desc->dest = dest; /* Destination address */
desc->ctrla = ctrla; /* Control A value */ desc->ctrla = ctrla; /* Control A value */
desc->ctrlb = ctrlb; /* Control B 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 */ /* 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; desc->ctrlb |= DMACHAN_CTRLB_BOTHDSCR;
dmach->lltail = desc; dmach->lltail = desc;
/* Increment the total number of bytes to be transferred */
dmach->bufsize += nbytes;
break; break;
} }
} }
@ -774,15 +799,10 @@ static void sam3u_freelinklist(struct sam3u_dma_s *dmach)
* channel * channel
*/ */
desc = dmach->llhead desc = dmach->llhead;
dmach->llhead = NULL; dmach->llhead = NULL;
dmach->lltail = NULL; dmach->lltail = NULL;
/* No transfer in progress */
dmach->remaining = 0;
dmach->bufsize = 0;
/* Reset each descriptor in the link list (thereby freeing them) */ /* Reset each descriptor in the link list (thereby freeing them) */
while (desc != NULL) while (desc != NULL)
@ -818,15 +838,15 @@ static int sam3u_txbuffer(struct sam3u_dma_s *dmach, uint32_t paddr,
if (dmach->llhead) if (dmach->llhead)
{ {
regval = dmach->llhead.ctrla; regval = dmach->llhead->ctrla;
ctrlb = dmach->llhead.ctrlb; ctrlb = dmach->llhead->ctrlb;
} }
else else
{ {
regval = sam3u_txctrlabits(dmach); 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 */ /* Add the new link list entry */
@ -834,6 +854,12 @@ static int sam3u_txbuffer(struct sam3u_dma_s *dmach, uint32_t paddr,
{ {
return -ENOMEM; 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; return OK;
} }
@ -860,22 +886,28 @@ static int sam3u_rxbuffer(struct sam3u_dma_s *dmach, uint32_t paddr,
if (dmach->llhead) if (dmach->llhead)
{ {
regval = dmach->llhead.ctrla; regval = dmach->llhead->ctrla;
ctrlb = dmach->llhead.ctrlb; ctrlb = dmach->llhead->ctrlb;
} }
else else
{ {
regval = sam3u_rxctrlabits(dmach); regval = sam3u_rxctrlabits(dmach);
ctrlb = sam3u_rxctrlb(dmach); ctrlb = sam3u_rxctrlb(dmach);
} }
ctrla = sam3u_rxctrla(regval, nbytes); ctrla = sam3u_rxctrla(dmach, regval, nbytes);
/* Add the new link list entry */ /* 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; 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; 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) 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; struct dma_linklist_s *llhead = dmach->llhead;
/* Clear any pending interrupts from any previous DMAC transfer by reading /* Clear any pending interrupts from any previous DMAC transfer by reading
@ -925,23 +951,26 @@ transfer
DEBUGASSERT((llhead->ctrlb & DMACHAN_CTRLB_BOTHDSCR) == DMACHAN_CTRLB_BOTHDSCR); DEBUGASSERT((llhead->ctrlb & DMACHAN_CTRLB_BOTHDSCR) == DMACHAN_CTRLB_BOTHDSCR);
/* Set up the CFG register */ /* 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 */ /* 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 */ putreg32(DMAC_CHER_ENA(dmach->chan), SAM3U_DMAC_CHER);
5. Source and destination request single and chunk DMAC transactions to transfer the /* The DMA has been started. Once the transfer completes, hardware sets the
buffer of data (assuming non-memory peripherals). The DMAC acknowledges at the * interrupts and disables the channel. We will received buffer complete and
completion of every transaction (chunk and single) in the buffer and carry out the buffer * transfer complete interrupts.
transfer. *
6. Once the transfer completes, hardware sets the interrupts and disables the channel. At * Enable error, buffer complete and transfer complete interrupts.
this time you can either respond to the buffer Complete or Transfer Complete interrupts, * (Since there is only a single buffer, we don't need the buffer complete
or poll for the Channel Handler Status Register (DMAC_CHSR.ENABLE[n]) bit until it is * interrupt).
cleared by hardware, to detect when the transfer is complete. */
putreg32(DMAC_EBC_CBTCINTS(dmach->chan), SAM3U_DMAC_EBCIER);
return OK;
} }
/**************************************************************************** /****************************************************************************
* Name: sam3u_multiple * Name: sam3u_multiple
* *
@ -952,13 +981,6 @@ transfer
static inline int sam3u_multiple(struct sam3u_dma_s *dmach) 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; struct dma_linklist_s *llhead = dmach->llhead;
DEBUGASSERT(llhead != NULL && llhead->src != 0); DEBUGASSERT(llhead != NULL && llhead->src != 0);
@ -966,11 +988,7 @@ with LLI support
/* Check the first and last CTRLB values */ /* Check the first and last CTRLB values */
DEBUGASSERT((llhead->ctrlb & DMACHAN_CTRLB_BOTHDSCR) == 0); DEBUGASSERT((llhead->ctrlb & DMACHAN_CTRLB_BOTHDSCR) == 0);
DEBUGASSERT((lltail->ctrlb & DMACHAN_CTRLB_BOTHDSCR) == DMACHAN_CTRLB_BOTHDSCR); DEBUGASSERT((dmach->lltail->ctrlb & DMACHAN_CTRLB_BOTHDSCR) == DMACHAN_CTRLB_BOTHDSCR);
/* Write the channel configuration information into the CFG register */
#error missing logic
/* Clear any pending interrupts from any previous DMAC transfer by reading the /* Clear any pending interrupts from any previous DMAC transfer by reading the
* status register * status register
@ -982,50 +1000,69 @@ with LLI support
putreg32(llhead->ctrlb, dmach->base + SAM3U_DMACHAN_CTRLA_OFFSET); putreg32(llhead->ctrlb, dmach->base + SAM3U_DMACHAN_CTRLA_OFFSET);
/* Program the DMAC_CTRLBx, DMAC_CFGx registers according to Row 4 as shown in /* Set up the CTRLB register */
Table 40-1 on page 1060. */
#error missing logic 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. */ /* Program the DSCR register with the pointer to the firstlink list entry. */
putreg32((uint32_t)dmach->llhead, dmac->base + SAM3U_DMACHAN_DSCR_OFFSET); putreg32((uint32_t)llhead, dmach->base + SAM3U_DMACHAN_DSCR_OFFSET);
#error missing logic
/* Finally, enable the channel by writing a ‘1’ to the CHER enable */ /* 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). putreg32(DMAC_CHER_ENA(dmach->chan), SAM3U_DMAC_CHER);
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 /* As each buffer of data is transferred, the CTRLA register is written back
buffer of data (assuming non-memory peripheral). The DMAC acknowledges at the * into the link list entry. The CTRLA contains updated BTSIZE and DONE bits.
completion of every transaction (chunk and single) in the buffer and carry out the buffer * Additionally, the CTRLA DONE bit is asserted when the buffer transfer has completed.
transfer. *
* 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.
*/
16. Once the buffer of data is transferred, the DMAC_CTRLAx register is written out to system putreg32(DMAC_EBC_CHANINTS(dmach->chan), SAM3U_DMAC_EBCIER);
memory at the same location and on the same layer where it was originally return OK;
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
/****************************************************************************
* 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;
} }
/**************************************************************************** /****************************************************************************
@ -1042,51 +1079,49 @@ static int sam3u_dmainterrupt(int irq, void *context)
unsigned int chndx; unsigned int chndx;
uint32_t regval; 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) 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 ???????;
/* Is the transfer finished? */
if (dmach->remaining == 0)
{
/* Disable Buffer Transfer Complete interrupts */
dmach = &g_dma[chndx]; dmach = &g_dma[chndx];
putreg32(DMAC_EBC_BTC(dmach->chan), SAM3U_DMAC_EBCIDR);
/* Disable the DMA channel */ /* Yes.. Did an error occur? */
putreg32(DMAC_CHDR_DIS(dmach->chan), SAM3U_DMAC_CHDR); if ((regval & DMAC_EBC_ERR(chndx)) != 0)
/* Free the linklist */
sam3u_freelinklist(dmach);
/* Perform the DMA complete callback */
if (dmach->callback)
{ {
dmach->callback(dmach->arg, dmach->result); /* Yes... Terminate the transfer with an error? */
sam3u_dmaterminate(dmach, -EIO);
} }
/* Is the transfer complete? */
else if ((regval & DMAC_EBC_CBTC(chndx)) != 0)
{
/* Yes.. Terminate the transfer with success */
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 */ /* Write the KEEPON field to clear the STALL states */
@ -1121,7 +1156,7 @@ void weak_function up_dmainitialize(void)
/* Disable all DMA interrupts */ /* Disable all DMA interrupts */
putreg32(DMAC_DBC_ERR_ALLINTS, SAM3U_DMAC_EBCIDR); putreg32(DMAC_EBC_ALLINTS, SAM3U_DMAC_EBCIDR);
/* Disable all DMA channels */ /* Disable all DMA channels */
@ -1141,8 +1176,8 @@ void weak_function up_dmainitialize(void)
/* Initialize semaphores */ /* Initialize semaphores */
sem_init(g_chsem, 0, 1); sem_init(&g_chsem, 0, 1);
sem_init(g_chsem, 0, CONFIG_SAM3U_NDMACHAN); 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; struct sam3u_dma_s *dmach;
unsigned int chndx; unsigned int chndx;
uint32_t regval;
/* Get the search parameters */ /* 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 &= (DMACH_FLAG_FLOWCONTROL | DMACH_FLAG_FIFOSIZE_MASK);
dmach->flags |= (dma_flags & ~((DMACH_FLAG_FLOWCONTROL | DMACH_FLAG_FIFOSIZE_MASK))); dmach->flags |= (dmach_flags & ~((DMACH_FLAG_FLOWCONTROL | DMACH_FLAG_FIFOSIZE_MASK)));
/* Initialize the transfer state */
dmach->remaining = 0;
break; break;
} }
} }
@ -1254,19 +1284,17 @@ void sam3u_dmafree(DMA_HANDLE handle)
* Description: * Description:
* Configure DMA for transmit of one buffer (memory to peripheral). This * Configure DMA for transmit of one buffer (memory to peripheral). This
* function may be called multiple times to handle large and/or dis- * 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. * 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; struct sam3u_dma_s *dmach = (struct sam3u_dma_s *)handle;
uint32_t regval;
int ret = OK; int ret = OK;
DEBUGASSERT(dmach && dmach->llhead != NULL && dmach->lltail != 0); DEBUGASSERT(dmach && dmach->llhead != NULL && dmach->lltail != 0);
DEBUGASSERT(dmach->remaining == 0);
/* If this is a large transfer, break it up into smaller buffers */ /* 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). * do do).
*/ */
if (dmach->flags & DMACH_FLAG_PERIPHINCREMENT) != 0) if ((dmach->flags & DMACH_FLAG_PERIPHINCREMENT) != 0)
{ {
paddr += DMACHAN_CTRLA_BTSIZE_MAX; paddr += DMACHAN_CTRLA_BTSIZE_MAX;
} }
if (dmach->flags & DMACH_FLAG_MEMINCREMENT) != 0) if ((dmach->flags & DMACH_FLAG_MEMINCREMENT) != 0)
{ {
maddr += DMACHAN_CTRLA_BTSIZE_MAX; 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); 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: * Description:
* Configure DMA for receipt of one buffer (peripheral to memory). This * Configure DMA for receipt of one buffer (peripheral to memory). This
* function may be called multiple times to handle large and/or dis- * 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. * 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) 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; struct sam3u_dma_s *dmach = (struct sam3u_dma_s *)handle;
uint32_t regval;
int ret = OK; int ret = OK;
DEBUGASSERT(dmach && dmach->llhead != NULL && dmach->lltail != 0); 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). * do do).
*/ */
if (dmach->flags & DMACH_FLAG_PERIPHINCREMENT) != 0) if ((dmach->flags & DMACH_FLAG_PERIPHINCREMENT) != 0)
{ {
paddr += DMACHAN_CTRLA_BTSIZE_MAX; paddr += DMACHAN_CTRLA_BTSIZE_MAX;
} }
if (dmach->flags & DMACH_FLAG_MEMINCREMENT) != 0) if ((dmach->flags & DMACH_FLAG_MEMINCREMENT) != 0)
{ {
maddr += DMACHAN_CTRLA_BTSIZE_MAX; 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); 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 * reset and sam3u_dmasetup() must be called before sam3u_dmastart() can be
* called again * called again
* *
* Assumptions:
* - DMA handle allocated by sam3u_dmachannel()
*
****************************************************************************/ ****************************************************************************/
void sam3u_dmastop(DMA_HANDLE handle) void sam3u_dmastop(DMA_HANDLE handle)
{ {
struct sam3u_dma_s *dmach = (struct sam3u_dma_s *)handle; struct sam3u_dma_s *dmach = (struct sam3u_dma_s *)handle;
irqstate_t flags;
/* Disable the channel by writing one to the write-only channel disable register */
DEBUGASSERT(dmach != NULL); DEBUGASSERT(dmach != NULL);
putreg32(DMAC_CHDR_DIS(dmach->chan), SAM3U_DMAC_CHDR); flags = irqsave();
sam3u_dmaterminate(dmach, -EINTR);
irqrestore(flags);
} }
/**************************************************************************** /****************************************************************************

6
arch/arm/src/sam3u/sam3u_dmac.h
View File

@ -263,7 +263,11 @@
# define DMAC_EBC_ERR1 (1 << (DMAC_EBC_ERR_SHIFT+1)) # define DMAC_EBC_ERR1 (1 << (DMAC_EBC_ERR_SHIFT+1))
# define DMAC_EBC_ERR2 (1 << (DMAC_EBC_ERR_SHIFT+2)) # define DMAC_EBC_ERR2 (1 << (DMAC_EBC_ERR_SHIFT+2))
# define DMAC_EBC_ERR3 (1 << (DMAC_EBC_ERR_SHIFT+3)) # 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 */ /* DMAC Channel Handler Enable Register */

2
arch/arm/src/sam3u/sam3u_internal.h
View File

@ -566,7 +566,7 @@ EXTERN void sam3u_dmafree(DMA_HANDLE handle);
* *
****************************************************************************/ ****************************************************************************/
EXTERN void sam3u_dmatxsetup(DMA_HANDLE handle, uint32_t paddr, uint32_t maddr, EXTERN int sam3u_dmatxsetup(DMA_HANDLE handle, uint32_t paddr, uint32_t maddr,
size_t nbytes); size_t nbytes);
/**************************************************************************** /****************************************************************************