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

A little more DMA logic

Browse Source 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2558 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2010-03-28 16:10:36 +00:00
parent 09f6529421
commit 24ba927450
4 changed files with 179 additions and 83 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

185
arch/arm/src/sam3u/sam3u_dmac.c
View File

@ -69,12 +69,13 @@
struct sam3u_dma_s
{
uint8_t chan; /* DMA channel number (0-6) */
uint8_t flags; /* DMA channel flags */
bool inuse; /* TRUE: The DMA channel is in use */
uint16_t flags; /* DMA channel flags */
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 */
volatile uint16_t xfrsize; /* Total transfer size */
uint16_t bufsize; /* Transfer buffer size in bytes */
volatile uint16_t remaining; /* Total number of bytes remaining to be transferred */
};
/****************************************************************************
@ -85,6 +86,22 @@ struct sam3u_dma_s
static sem_t g_dmasem;
/* CTRLA field lookups */
static const uint32_t g_srcwidth[3] =
{
DMACHAN_CTRLA_SRCWIDTH_BYTE,
DMACHAN_CTRLA_SRCWIDTH_HWORD,
DMACHAN_CTRLA_SRCWIDTH_WORD
};
static const uint32_t g_destwidth[3] =
{
DMACHAN_CTRLA_DSTWIDTH_BYTE,
DMACHAN_CTRLA_DSTWIDTH_HWORD,
DMACHAN_CTRLA_DSTWIDTH_WORD
};
/* This array describes the state of each DMA */
static struct sam3u_dma_s g_dma[CONFIG_SAM3U_NDMACHAN] =
@ -201,42 +218,23 @@ static inline void
sam3u_settxctrla(struct sam3u_dma_s *dmach, uint32_t dmasize, uint32_t otherbits)
{
uint32_t regval;
uint32_t flags;
unsigned int ndx;
DEBUGASSERT(dmach && dmasize <= DMACHAN_CTRLA_BTSIZE_MAX);
regval = (dmasize << DMACHAN_CTRLA_BTSIZE_SHIFT) | otherbits;
/* Since this is a transmit, the source is described by the memeory selections */
flags = dmach->flags & DMACH_FLAG_MEMWIDTH_MASK;
if (flags == DMACH_FLAG_MEMWIDTH_8BITS)
{
regval |= DMACHAN_CTRLA_SRCWIDTH_BYTE;
}
else if (flags == DMACH_FLAG_MEMWIDTH_16BITS)
{
regval |= DMACHAN_CTRLA_SRCWIDTH_HWORD;
}
else /* if (flags == DMACH_FLAG_MEMWIDTH_32BITS) */
{
regval |= DMACHAN_CTRLA_SRCWIDTH_WORD;
}
ndx = (dmach->flags & DMACH_FLAG_MEMWIDTH_MASK) >> DMACH_FLAG_MEMWIDTH_SHIFT;
DEBUGASSERT(ndx < 3);
regval |= g_srcwidth[ndx];
return regval;
/* Since this is a transmit, the destination is described by the peripheral selections */
flags = dmach->flags & DMACH_FLAG_PERIPHWIDTH_MASK;
if (flags == DMACH_FLAG_PERIPHWIDTH_8BITS)
{
regval |= DMACHAN_CTRLA_DSTWIDTH_BYTE;
}
else if (flags == DMACH_FLAG_PERIPHWIDTH_16BITS)
{
regval |= DMACHAN_CTRLA_DSTWIDTH_HWORD;
}
else /* if (flags == DMACH_FLAG_PERIPHWIDTH_32BITS) */
{
regval |= DMACHAN_CTRLA_DSTWIDTH_WORD;
}
ndx = (dmach->flags & DMACH_FLAG_PERIPHWIDTH_MASK) >> DMACH_FLAG_PERIPHWIDTH_SHIFT;
DEBUGASSERT(ndx < 3);
regval |= g_destwidth[ndx];
return regval;
}
@ -252,46 +250,110 @@ sam3u_settxctrla(struct sam3u_dma_s *dmach, uint32_t dmasize, uint32_t otherbits
static inline void
sam3u_setrxctrla(struct sam3u_dma_s *dmach, uint32_t dmasize, uint32_t otherbits)
{
uint32_t regval;
uint32_t flags;
uint32_t regval;
unsigned int ndx;
DEBUGASSERT(dmach && dmasize <= DMACHAN_CTRLA_BTSIZE_MAX);
regval = (dmasize << DMACHAN_CTRLA_BTSIZE_SHIFT) | otherbits;
/* Since this is a receive, the source is described by the peripheral selections */
flags = dmach->flags & DMACH_FLAG_PERIPHWIDTH_MASK;
if (flags == DMACH_FLAG_PERIPHWIDTH_8BITS)
{
regval |= DMACHAN_CTRLA_SRCWIDTH_BYTE;
}
else if (flags == DMACH_FLAG_PERIPHWIDTH_16BITS)
{
regval |= DMACHAN_CTRLA_SRCWIDTH_HWORD;
}
else /* if (flags == DMACH_FLAG_PERIPHWIDTH_32BITS) */
{
regval |= DMACHAN_CTRLA_SRCWIDTH_WORD;
}
ndx = (dmach->flags & DMACH_FLAG_PERIPHWIDTH_MASK) >> DMACH_FLAG_PERIPHWIDTH_SHIFT;
DEBUGASSERT(ndx < 3);
regval |= g_srcwidth[ndx];
/* Since this is a receive, the destination is described by the memory selections */
flags = dmach->flags & DMACH_FLAG_MEMWIDTH_MASK;
if (flags == DMACH_FLAG_MEMWIDTH_8BITS)
{
regval |= DMACHAN_CTRLA_DSTWIDTH_BYTE;
}
else if (flags == DMACH_FLAG_MEMWIDTH_16BITS)
{
regval |= DMACHAN_CTRLA_DSTWIDTH_HWORD;
}
else /* if (flags == DMACH_FLAG_MEMWIDTH_32BITS) */
{
regval |= DMACHAN_CTRLA_DSTWIDTH_WORD;
}
ndx = (dmach->flags & DMACH_FLAG_MEMWIDTH_MASK) >> DMACH_FLAG_MEMWIDTH_SHIFT;
DEBUGASSERT(ndx < 3);
regval |= g_destwidth[ndx];
return regval;
}
/************************************************************************************
* Name: sam3u_srcctrlb
*
* Description:
* Set source related CTRLB fields
*
************************************************************************************/
static void sam3u_srcctrlb(struct sam3u_dma_s *dmach, bool lli, bool autoincr)
{
uint32_t regval;
/* Fetch CTRLB and clear the configurable bits */
regval = getreg32(dmach->base + SAM3U_DMACHAN_CTRLB_OFFSET);
regval &= ~ (DMACHAN_CTRLB_SRCDSCR | DMACHAN_CTRLB_SRCINCR_MASK | 1<<31);
/* Disable the source descriptor if we are not using the LLI transfer mode */
if (lli)
{
regval |= DMACHAN_CTRLB_SRCDSCR;
}
/* Select address incrementing */
regval |= autoincr ? DMACHAN_CTRLB_SRCINCR_INCR ? DMACHAN_CTRLB_SRCINCR_FIXED;
/* Save the updated CTRLB value */
putreg32(regval, dmach->base + SAM3U_DMACHAN_CTRLB_OFFSET)
}
/************************************************************************************
* Name: sam3u_destctrlb
*
* Description:
* Set destination related CTRLB fields
*
************************************************************************************/
static void sam3u_destctrlb(struct sam3u_dma_s *dmach, bool lli, bool autoincr)
{
uint32_t regval;
/* Fetch CTRLB and clear the configurable bits */
regval = getreg32(dmach->base + SAM3U_DMACHAN_CTRLB_OFFSET);
regval &= ~ (DMACHAN_CTRLB_DSTDSCR | DMACHAN_CTRLB_DSTINCR_MASK);
/* Disable the source descriptor if we are not using the LLI transfer mode */
if (lli)
{
regval |= DMACHAN_CTRLB_DSTDSCR;
}
/* Select address incrementing */
regval |= autoincr ? DMACHAN_CTRLB_DESTINCR_INCR ? DMACHAN_CTRLB_DESTINCR_FIXED;
/* Save the updated CTRLB value */
putreg32(regval, dmach->base + SAM3U_DMACHAN_CTRLB_OFFSET)
}
/************************************************************************************
* 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_dmainterrupt
*
@ -355,6 +417,11 @@ void weak_function up_dmainitialize(void)
* 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
@ -362,7 +429,7 @@ void weak_function up_dmainitialize(void)
*
****************************************************************************/
DMA_HANDLE sam3u_dmachannel(uint8_t dmach_flags)
DMA_HANDLE sam3u_dmachannel(uint16_t dmach_flags)
{
struct sam3u_dma_s *dmach;
unsigned int chndx;
@ -406,7 +473,7 @@ DMA_HANDLE sam3u_dmachannel(uint8_t dmach_flags)
/* Initialize the transfer state */
dmach->xfrsize = 0;
dmach->remaining = 0;
break;
}
}

12
arch/arm/src/sam3u/sam3u_dmac.h
View File

@ -360,8 +360,8 @@
/* DMAC Channel n [n = 0..3] Control B Register */
#define DMACHAN_CTRLB_SRCDSCR (1 << 16) /* Bit 16: Source uffer Descriptor Fetch operation disabled */
#define DMACHAN_CTRLB_DSTDSCR (1 << 20) /* Bit 20: Dest Buffer Descriptor Fetch operation disabled */
#define DMACHAN_CTRLB_SRCDSCR (1 << 16) /* Bit 16: Source buffer descriptor fetch operation disabled */
#define DMACHAN_CTRLB_DSTDSCR (1 << 20) /* Bit 20: Dest buffer descriptor fetch operation disabled */
#define DMACHAN_CTRLB_FC_SHIFT (21) /* Bits 21-22: Flow controller */
#define DMACHAN_CTRLB_FC_MASK (3 << DMACHAN_CTRLB_FC_SHIFT)
# define DMACHAN_CTRLB_FC_M2M (0 << DMACHAN_CTRLB_FC_SHIFT) /* Memory-to-Memory */
@ -380,7 +380,7 @@
/* DMAC Channel n [n = 0..3] Configuration Register */
#define DMACHAN_CFG_SRCPER_SHIFT (0) /* Bits 0-3: Chanel source associated with peripheral ID */
#define DMACHAN_CFG_SRCPER_SHIFT (0) /* Bits 0-3: Channel source associated with peripheral ID */
#define DMACHAN_CFG_SRCPER_MASK (15 << DMACHAN_CFG_SRCPER_SHIFT)
#define DMACHAN_CFG_DSTPER_SHIFT (4) /* Bits 4-7: Channel dest associated with peripheral ID */
#define DMACHAN_CFG_DSTPER_MASK (15 << DMACHAN_CFG_DSTPER_SHIFT)
@ -401,6 +401,12 @@
# define DMACHAN_CFG_FIFOCFG_HALF (1 << DMACHAN_CFG_FIFOCFG_SHIFT) /* Half FIFO size */
# define DMACHAN_CFG_FIFOCFG_SINGLE (2 << DMACHAN_CFG_FIFOCFG_SHIFT) /* Single AHB access */
/* DMA Peripheral IDs *******************************************************************/
#define DMACHAN_PID_MCI0 0
#define DMACHAN_PID_SSC 3
#define DMACHAN_PID_MCI1 13
/****************************************************************************************
* Public Types
****************************************************************************************/

4
arch/arm/src/sam3u/sam3u_hsmci.c
View File

@ -120,7 +120,9 @@
/* DMA configuration flags */
#define DMA_FLAGS \
(DMACH_FLAG_FIFO_8BYTES|DMACH_FLAG_SRCWIDTH_32BITS|DMACH_FLAG_DESTWIDTH_32BITS|DMACH_FLAG_MEMINCREMENT)
((DMACHAN_PID_MCI0 << DMACH_FLAG_PERIPHPID_SHIFT) | \
DMACH_FLAG_PERIPHH2SEL | DMACH_FLAG_PERIPHLLIMODE | DMACH_FLAG_PERIPHWIDTH_32BITS | \
DMACH_FLAG_MEMLLIMODE | DMACH_FLAG_MEMWIDTH_32BITS | DMACH_FLAG_MEMINCREMENT)
/* FIFO sizes */

61
arch/arm/src/sam3u/sam3u_internal.h
View File

@ -297,23 +297,39 @@
* be used if, for example, both sides were memory although the naming would be awkward)
*/
#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 */
#define DMACH_FLAG_PERIPHWIDTH_SHIFT (2) /* Bits 2-3: 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) /* 16 bits */
#define DMACH_FLAG_PERIPHINCREMENT (1 << 4) /* Bit 4: Autoincrement peripheral address */
#define DMACH_FLAG_MEMWIDTH_SHIFT (5) /* Bits 5-6: 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) /* 16 bits */
#define DMACH_FLAG_MEMINCREMENT (1 << 7) /* Bit 7: Autoincrement memory address */
/* 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 */
/* Peripheral endpoint characteristics */
#define DMACH_FLAG_PERIPHPID_SHIFT (2) /* Bits 2-5: Peripheral PID */
#define DMACH_FLAG_PERIPHPID_MASK (15 << DMACH_FLAG_PERIPHPID_SHIFT)
#define DMACH_FLAG_PERIPHH2SEL (1 << 6) /* Bits 6: HW handshaking */
#define DMACH_FLAG_PERIPHWIDTH_SHIFT (7) /* Bits 7-8: 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) /* 16 bits */
#define DMACH_FLAG_PERIPHINCREMENT (1 << 9) /* Bit 9: Autoincrement peripheral address */
#define DMACH_FLAG_PERIPHLLIMODE (1 << 10) /* Bit 10: Use link list descriptors */
/* Memory endpoint characteristics */
#define DMACH_FLAG_MEMPID_SHIFT (11) /* Bits 11-14: Memory PID */
#define DMACH_FLAG_MEMPID_MASK (15 << DMACH_FLAG_PERIPHPID_SHIFT)
#define DMACH_FLAG_MEMH2SEL (1 << 15) /* Bits 15: HW handshaking */
#define DMACH_FLAG_MEMWIDTH_SHIFT (16) /* Bits 16-17: 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) /* 16 bits */
#define DMACH_FLAG_MEMINCREMENT (1 << 18) /* Bit 18: Autoincrement memory address */
#define DMACH_FLAG_MEMLLIMODE (1 << 19) /* Bit 19: Use link list descriptors */
/************************************************************************************
* Public Types
@ -492,6 +508,11 @@ EXTERN void sam3u_gpioirqdisable(int irq);
* 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
@ -499,7 +520,7 @@ EXTERN void sam3u_gpioirqdisable(int irq);
*
****************************************************************************/
EXTERN DMA_HANDLE sam3u_dmachannel(uint8_t dmach_flags);
EXTERN DMA_HANDLE sam3u_dmachannel(uint32_t dmach_flags);
/****************************************************************************
* Name: sam3u_dmafree
@ -520,7 +541,7 @@ EXTERN void sam3u_dmafree(DMA_HANDLE handle);
* Name: sam3u_dmatxsetup
*
* Description:
* Configure DMA for transmit (memory to periphal) before using
* Configure DMA for transmit (memory to periphal).
*
****************************************************************************/
@ -531,7 +552,7 @@ EXTERN void sam3u_dmatxsetup(DMA_HANDLE handle, uint32_t paddr, uint32_t maddr,
* Name: sam3u_dmarxsetup
*
* Description:
* Configure DMA for receive (peripheral to memory) before using
* Configure DMA for receive (peripheral to memory).
*
****************************************************************************/