sys-spi.c File Reference

#include <io.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <types.h>
#include <timer.h>
#include <log.h>
#include <sys-clk.h>
#include <sys-dma.h>
#include <sys-gpio.h>
#include "sys-spi.h"

Include dependency graph for sys-spi.c:

Enumerations
enum	{   SPI_GCR = 0x04 , SPI_TCR = 0x08 , SPI_IER = 0x10 , SPI_ISR = 0x14 ,   SPI_FCR = 0x18 , SPI_FSR = 0x1c , SPI_WCR = 0x20 , SPI_CCR = 0x24 ,   SPI_DLY = 0x28 , SPI_MBC = 0x30 , SPI_MTC = 0x34 , SPI_BCC = 0x38 ,   SPI_TXD = 0x200 , SPI_RXD = 0x300 }
enum	{   SPI_GCR_SRST_POS = 31 , SPI_GCR_SRST_MSK = (1 << SPI_GCR_SRST_POS) , SPI_GCR_TPEN_POS = 7 , SPI_GCR_TPEN_MSK = (1 << SPI_GCR_TPEN_POS) ,   SPI_GCR_MODE_POS = 1 , SPI_GCR_MODE_MSK = (1 << SPI_GCR_MODE_POS) , SPI_GCR_EN_POS = 0 , SPI_GCR_EN_MSK = (1 << SPI_GCR_EN_POS) }
enum	{   SPI_BCC_DUAL_RX = (1 << 28) , SPI_BCC_QUAD_IO = (1 << 29) , SPI_BCC_STC_MSK = (0x00ffffff) , SPI_BCC_DUM_POS = 24 ,   SPI_BCC_DUM_MSK = (0xf << SPI_BCC_DUM_POS) }
enum	{ SPI_MBC_CNT_MSK = (0x00ffffff) }
enum	{ SPI_MTC_CNT_MSK = (0x00ffffff) }
enum	{   SPI_TCR_SPOL_POS = 2 , SPI_TCR_SPOL_MSK = (1 << SPI_TCR_SPOL_POS) , SPI_TCR_SS_OWNER_POS = 6 , SPI_TCR_SS_OWNER_MSK = (1 << SPI_TCR_SS_OWNER_POS) ,   SPI_TCR_DHB_POS = 8 , SPI_TCR_DHB_MSK = (1 << SPI_TCR_DHB_POS) , SPI_TCR_SDC_POS = 11 , SPI_TCR_SDC_MSK = (1 << SPI_TCR_SDC_POS) ,   SPI_TCR_SDM_POS = 13 , SPI_TCR_SDM_MSK = (1 << SPI_TCR_SDM_POS) }
enum	{   SPI_FCR_RX_LEVEL_POS = 0 , SPI_FCR_RX_LEVEL_MSK = (0xff < SPI_FCR_RX_LEVEL_POS) , SPI_FCR_RX_DRQEN_POS = 8 , SPI_FCR_RX_DRQEN_MSK = (0x1 << SPI_FCR_RX_DRQEN_POS) ,   SPI_FCR_RX_TESTEN_POS = 14 , SPI_FCR_RX_TESTEN_MSK = (0x1 << SPI_FCR_RX_TESTEN_POS) , SPI_FCR_RX_RST_POS = 15 , SPI_FCR_RX_RST_MSK = (0x1 << SPI_FCR_RX_RST_POS) ,   SPI_FCR_TX_LEVEL_POS = 16 , SPI_FCR_TX_LEVEL_MSK = (0xff << SPI_FCR_TX_LEVEL_POS) , SPI_FCR_TX_DRQEN_POS = 24 , SPI_FCR_TX_DRQEN_MSK = (0x1 << SPI_FCR_TX_DRQEN_POS) ,   SPI_FCR_TX_TESTEN_POS = 30 , SPI_FCR_TX_TESTEN_MSK = (0x1 << SPI_FCR_TX_TESTEN_POS) , SPI_FCR_TX_RST_POS = 31 , SPI_FCR_TX_RST_MSK = (0x1 << SPI_FCR_TX_RST_POS) }
enum	{ SPI_FSR_RF_CNT_POS = 0 , SPI_FSR_RF_CNT_MSK = (0xff << SPI_FSR_RF_CNT_POS) , SPI_FSR_TF_CNT_POS = 16 , SPI_FSR_TF_CNT_MSK = (0xff << SPI_FSR_TF_CNT_POS) }

Functions
static uint32_t	sunxi_spi_set_clk (sunxi_spi_t *spi, u32 spi_clk, u32 mclk, u32 cdr2)
static int	spi_clk_init (sunxi_spi_t *spi, uint32_t mod_clk)
static void	spi_reset_fifo (sunxi_spi_t *spi)
static uint32_t	spi_query_txfifo (sunxi_spi_t *spi)
static uint32_t	spi_query_rxfifo (sunxi_spi_t *spi)
static int	spi_dma_cfg (void)
static int	spi_dma_init (void)
static void	sunxi_spi_gpio_init (sunxi_spi_t *spi)
static int	sunxi_spi_get_clk (sunxi_spi_t *spi)
int	sunxi_spi_init (sunxi_spi_t *spi)
	Initializes the SPI interface.
void	sunxi_spi_disable (sunxi_spi_t *spi)
	Disables the SPI interface.
static void	spi_set_counters (sunxi_spi_t *spi, int txlen, int rxlen, int stxlen, int dummylen)
static void	spi_write_tx_fifo (sunxi_spi_t *spi, uint8_t *buf, uint32_t len)
static uint32_t	spi_read_rx_fifo (sunxi_spi_t *spi, uint8_t *buf, uint32_t len)
static void	spi_set_io_mode (sunxi_spi_t *spi, spi_io_mode_t mode)
int	sunxi_spi_transfer (sunxi_spi_t *spi, spi_io_mode_t mode, void *txbuf, uint32_t txlen, void *rxbuf, uint32_t rxlen)
	Performs SPI data transfer.

Variables
static sunxi_dma_set_t	spi_rx_dma
static u32	spi_rx_dma_hd

Enumeration Type Documentation

anonymous enum

anonymous enum

Enumerator
SPI_GCR
SPI_TCR
SPI_IER
SPI_ISR
SPI_FCR
SPI_FSR
SPI_WCR
SPI_CCR
SPI_DLY
SPI_MBC
SPI_MTC
SPI_BCC
SPI_TXD
SPI_RXD

anonymous enum

anonymous enum

Enumerator
SPI_GCR_SRST_POS
SPI_GCR_SRST_MSK
SPI_GCR_TPEN_POS
SPI_GCR_TPEN_MSK
SPI_GCR_MODE_POS
SPI_GCR_MODE_MSK
SPI_GCR_EN_POS
SPI_GCR_EN_MSK

anonymous enum

anonymous enum

Enumerator
SPI_BCC_DUAL_RX
SPI_BCC_QUAD_IO
SPI_BCC_STC_MSK
SPI_BCC_DUM_POS
SPI_BCC_DUM_MSK

anonymous enum

anonymous enum

Enumerator
SPI_MBC_CNT_MSK

anonymous enum

anonymous enum

Enumerator
SPI_MTC_CNT_MSK

anonymous enum

anonymous enum

Enumerator
SPI_TCR_SPOL_POS
SPI_TCR_SPOL_MSK
SPI_TCR_SS_OWNER_POS
SPI_TCR_SS_OWNER_MSK
SPI_TCR_DHB_POS
SPI_TCR_DHB_MSK
SPI_TCR_SDC_POS
SPI_TCR_SDC_MSK
SPI_TCR_SDM_POS
SPI_TCR_SDM_MSK

anonymous enum

anonymous enum

Enumerator
SPI_FCR_RX_LEVEL_POS
SPI_FCR_RX_LEVEL_MSK
SPI_FCR_RX_DRQEN_POS
SPI_FCR_RX_DRQEN_MSK
SPI_FCR_RX_TESTEN_POS
SPI_FCR_RX_TESTEN_MSK
SPI_FCR_RX_RST_POS
SPI_FCR_RX_RST_MSK
SPI_FCR_TX_LEVEL_POS
SPI_FCR_TX_LEVEL_MSK
SPI_FCR_TX_DRQEN_POS
SPI_FCR_TX_DRQEN_MSK
SPI_FCR_TX_TESTEN_POS
SPI_FCR_TX_TESTEN_MSK
SPI_FCR_TX_RST_POS
SPI_FCR_TX_RST_MSK

anonymous enum

anonymous enum

Enumerator
SPI_FSR_RF_CNT_POS
SPI_FSR_RF_CNT_MSK
SPI_FSR_TF_CNT_POS
SPI_FSR_TF_CNT_MSK

Function Documentation

spi_clk_init()

static int spi_clk_init ( sunxi_spi_t *  spi, uint32_t  mod_clk  )

static

spi_dma_cfg()

static int spi_dma_cfg ( void  )

static

spi_dma_init()

static int spi_dma_init ( void  )

static

spi_query_rxfifo()

static uint32_t spi_query_rxfifo ( sunxi_spi_t *  spi )

inlinestatic

spi_query_txfifo()

static uint32_t spi_query_txfifo ( sunxi_spi_t *  spi )

inlinestatic

spi_read_rx_fifo()

static uint32_t spi_read_rx_fifo ( sunxi_spi_t *  spi, uint8_t *  buf, uint32_t  len  )

static

spi_reset_fifo()

static void spi_reset_fifo ( sunxi_spi_t *  spi )

static

spi_set_counters()

static void spi_set_counters ( sunxi_spi_t *  spi, int  txlen, int  rxlen, int  stxlen, int  dummylen  )

static

spi_set_io_mode()

static void spi_set_io_mode ( sunxi_spi_t *  spi, spi_io_mode_t  mode  )

static

spi_write_tx_fifo()

static void spi_write_tx_fifo ( sunxi_spi_t *  spi, uint8_t *  buf, uint32_t  len  )

static

sunxi_spi_disable()

void sunxi_spi_disable

(

sunxi_spi_t *

spi

)

Disables the SPI interface.

This function disables the SPI bus, deinitializes DMA (if used), and deinitializes the SPI clock. It is called when the SPI interface is no longer needed or when performing cleanup operations.

Parameters

spi	Pointer to the SPI structure containing configuration and register information.

sunxi_spi_get_clk()

static int sunxi_spi_get_clk ( sunxi_spi_t *  spi )

static

sunxi_spi_gpio_init()

static void sunxi_spi_gpio_init ( sunxi_spi_t *  spi )

static

sunxi_spi_init()

int sunxi_spi_init

(

sunxi_spi_t *

spi

)

Initializes the SPI interface.

This function initializes the SPI interface by configuring the GPIO pins, clock, bus, and counters. If a DMA handle is set, DMA mode is used for data transfers. The function calls several other SPI initialization functions to set up the SPI hardware.

Parameters

spi	Pointer to the SPI structure containing configuration and register information.

Returns

0 on success.

sunxi_spi_set_clk()

static uint32_t sunxi_spi_set_clk ( sunxi_spi_t *  spi, u32  spi_clk, u32  mclk, u32  cdr2  )

static

sunxi_spi_transfer()

int sunxi_spi_transfer	(	sunxi_spi_t *	spi,
		spi_io_mode_t	mode,
		void *	txbuf,
		uint32_t	txlen,
		void *	rxbuf,
		uint32_t	rxlen
	)

Performs SPI data transfer.

This function initiates a data transfer on the SPI bus. The transfer can be either full-duplex (both transmission and reception) or half-duplex (only transmission or reception). The transfer is done based on the specified SPI I/O mode. The function handles both transmit and receive operations, including the use of DMA if required for large transfers.

Parameters

spi	Pointer to the SPI structure containing configuration and register information.
mode	The I/O mode to use for the transfer (e.g., single, dual, quad).
txbuf	Pointer to the transmission buffer.
txlen	Length of the transmission data in bytes.
rxbuf	Pointer to the reception buffer.
rxlen	Length of the reception data in bytes.

Returns

The total number of bytes transferred (txlen + rxlen).

Variable Documentation

spi_rx_dma

sunxi_dma_set_t spi_rx_dma

static

spi_rx_dma_hd

u32 spi_rx_dma_hd

static