dma.c File Reference

DMA Controller. More...

Macros
PI Status Register Bit Definitions
#define	PI_STATUS_DMA_BUSY   ( 1 << 0 )
	PI DMA Busy.
#define	PI_STATUS_IO_BUSY   ( 1 << 1 )
	PI IO Busy.
#define	PI_STATUS_ERROR   ( 1 << 2 )
	PI Error.

Functions
bool	io_accessible (uint32_t pi_address)
	Check whether the specified PI address can be accessed doing I/O from CPU.
volatile int	dma_busy (void)
	Return whether the DMA controller is currently busy.
void	dma_read_raw_async (void *ram_address, unsigned long pi_address, unsigned long len)
	Start reading data from a peripheral through PI DMA (low-level)
void	dma_write_raw_async (const void *ram_address, unsigned long pi_address, unsigned long len)
	Start writing data to a peripheral through PI DMA (low-level)
void	dma_read_async (void *ram_pointer, unsigned long pi_address, unsigned long len)
	Start reading data from a peripheral through PI DMA.
void	dma_wait (void)
	Wait until an async DMA or I/O transfer is finished.
void	dma_read (void *ram_address, unsigned long pi_address, unsigned long len)
	Read data from a peripheral through PI DMA, waiting for completion.
void	dma_write (const void *ram_address, unsigned long rom_address, unsigned long len)
	Write to a peripheral.
uint32_t	io_read (uint32_t pi_address)
	Read a 32 bit integer from a peripheral using the CPU.
void	io_write (uint32_t pi_address, uint32_t data)
	Write a 32 bit integer to a peripheral using the CPU.

Detailed Description

DMA Controller.

Author

Jennifer Taylor drago.nosp@m.nmin.nosp@m.ded@d.nosp@m.rago.nosp@m.nmind.nosp@m.ed.c.nosp@m.om

Giovanni Bajo giova.nosp@m.nnib.nosp@m.ajo@g.nosp@m.mail.nosp@m..com