ssp.c File Reference

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <mach/irqs.h>
#include <asm/hardware/ssp.h>

Go to the source code of this file.

Macros
#define	TIMEOUT   100000

Functions
int	ssp_write_word (u16 data)
int	ssp_read_word (u16 *data)
int	ssp_flush (void)
void	ssp_enable (void)
void	ssp_disable (void)
void	ssp_save_state (struct ssp_state *ssp)
void	ssp_restore_state (struct ssp_state *ssp)
int	ssp_init (void)
void	ssp_exit (void)
	MODULE_AUTHOR ("Russell King")
	MODULE_DESCRIPTION ("SA11x0 SSP PIO driver")
	MODULE_LICENSE ("GPL")
	EXPORT_SYMBOL (ssp_write_word)
	EXPORT_SYMBOL (ssp_read_word)
	EXPORT_SYMBOL (ssp_flush)
	EXPORT_SYMBOL (ssp_enable)
	EXPORT_SYMBOL (ssp_disable)
	EXPORT_SYMBOL (ssp_save_state)
	EXPORT_SYMBOL (ssp_restore_state)
	EXPORT_SYMBOL (ssp_init)
	EXPORT_SYMBOL (ssp_exit)

Macro Definition Documentation

#define TIMEOUT   100000

Definition at line 26 of file ssp.c.

Function Documentation

EXPORT_SYMBOL

(

ssp_write_word

)

EXPORT_SYMBOL

(

ssp_read_word

)

EXPORT_SYMBOL

(

ssp_flush

)

EXPORT_SYMBOL

(

ssp_enable

)

EXPORT_SYMBOL

(

ssp_disable

)

EXPORT_SYMBOL

(

ssp_save_state

)

EXPORT_SYMBOL

(

ssp_restore_state

)

EXPORT_SYMBOL

(

ssp_init

)

EXPORT_SYMBOL

(

ssp_exit

)

MODULE_AUTHOR

(

"Russell King"

)

MODULE_DESCRIPTION

(

"SA11x0 SSP PIO driver"

)

MODULE_LICENSE

(

"GPL"

)

void ssp_disable

(

void

)

ssp_disable - shut down the SSP port

Turn off the SSP port, optionally powering it down.

Definition at line 150 of file ssp.c.

void ssp_enable

(

void

)

ssp_enable - enable the SSP port

Turn on the SSP port.

Definition at line 140 of file ssp.c.

void ssp_exit

(

void

)

ssp_exit - undo the effects of ssp_init

release and free resources for the SSP port.

Definition at line 223 of file ssp.c.

int ssp_flush

(

void

)

ssp_flush - flush the transmit and receive FIFOs

Wait for the SSP to idle, and ensure that the receive FIFO is empty.

The caller is expected to perform the necessary locking.

Returns: %-ETIMEDOUT timeout occurred 0 success

Definition at line 118 of file ssp.c.

int ssp_init

(

void

)

ssp_init - setup the SSP port

initialise and claim resources for the SSP port.

Returns: %-ENODEV if the SSP port is unavailable %-EBUSY if the resources are already in use %0 on success

Definition at line 194 of file ssp.c.

int ssp_read_word

(

u16 *

data

)

ssp_read_word - read a word from the SSP port

Wait for a data word in the SSP receive FIFO, and return the received data. Data is LSB justified.

Note: Currently, if data is not expected to be received, this function will wait for ever.

The caller is expected to perform the necessary locking.

Returns: %-ETIMEDOUT timeout occurred 16-bit data success

Definition at line 91 of file ssp.c.

void ssp_restore_state

(

struct ssp_state *

ssp

)

ssp_restore_state - restore a previously saved SSP configuration : pointer to configuration saved by ssp_save_state

Restore the SSP configuration saved previously by ssp_save_state.

Definition at line 175 of file ssp.c.

void ssp_save_state

(

struct ssp_state *

ssp

)

ssp_save_state - save the SSP configuration : pointer to structure to save SSP configuration

Save the configured SSP state for suspend.

Definition at line 161 of file ssp.c.

int ssp_write_word

(

u16

data

)

ssp_write_word - write a word to the SSP port : 16-bit, MSB justified data to write.

Wait for a free entry in the SSP transmit FIFO, and write a data word to the SSP port. Wait for the SSP port to start sending the data.

The caller is expected to perform the necessary locking.

Returns: %-ETIMEDOUT timeout occurred 0 success

Definition at line 54 of file ssp.c.