i2c.c File Reference

#include <device/mmio.h>
#include <assert.h>
#include <console/console.h>
#include <delay.h>
#include <device/i2c_simple.h>
#include <soc/clk.h>
#include <soc/i2c.h>
#include <soc/periph.h>
#include <timer.h>

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Data Structures
struct	i2c_regs
struct	s3c24x0_i2c_bus

Macros
#define	I2C_TIMEOUT_US   (1000 * USECS_PER_MSEC)

Enumerations
enum	{ I2cConIntPending = 0x1 << 4 , I2cConIntEn = 0x1 << 5 , I2cConAckGen = 0x1 << 7 }
enum	{   I2cStatAck = 0x1 << 0 , I2cStatAddrZero = 0x1 << 1 , I2cStatAddrSlave = 0x1 << 2 , I2cStatArb = 0x1 << 3 ,   I2cStatEnable = 0x1 << 4 , I2cStatStartStop = 0x1 << 5 , I2cStatBusy = 0x1 << 5 , I2cStatModeMask = 0x3 << 6 ,   I2cStatSlaveRecv = 0x0 << 6 , I2cStatSlaveXmit = 0x1 << 6 , I2cStatMasterRecv = 0x2 << 6 , I2cStatMasterXmit = 0x3 << 6 }

Functions
static int	i2c_int_pending (struct i2c_regs *regs)
static void	i2c_clear_int (struct i2c_regs *regs)
static void	i2c_ack_enable (struct i2c_regs *regs)
static void	i2c_ack_disable (struct i2c_regs *regs)
static int	i2c_got_ack (struct i2c_regs *regs)
static int	i2c_wait_for_idle (struct i2c_regs *regs, int timeout_us)
static int	i2c_wait_for_int (struct i2c_regs *regs, int timeout_us)
static int	i2c_send_stop (struct i2c_regs *regs)
static int	i2c_send_start (struct i2c_regs *regs, int read, int chip)
static int	i2c_xmit_buf (struct i2c_regs *regs, uint8_t *data, int len)
static int	i2c_recv_buf (struct i2c_regs *regs, uint8_t *data, int len)
int	platform_i2c_transfer (unsigned int bus, struct i2c_msg *segments, int seg_count)
void	i2c_init (unsigned int bus, int speed, int slaveadd)

Variables
static struct s3c24x0_i2c_bus	i2c_busses []

Macro Definition Documentation

I2C_TIMEOUT_US

#define I2C_TIMEOUT_US   (1000 * USECS_PER_MSEC)

Definition at line 13 of file i2c.c.

Enumeration Type Documentation

anonymous enum

anonymous enum

Enumerator
I2cConIntPending
I2cConIntEn
I2cConAckGen

Definition at line 35 of file i2c.c.

anonymous enum

anonymous enum

Enumerator
I2cStatAck
I2cStatAddrZero
I2cStatAddrSlave
I2cStatArb
I2cStatEnable
I2cStatStartStop
I2cStatBusy
I2cStatModeMask
I2cStatSlaveRecv
I2cStatSlaveXmit
I2cStatMasterRecv
I2cStatMasterXmit

Definition at line 41 of file i2c.c.

Function Documentation

i2c_ack_disable()

static void i2c_ack_disable ( struct i2c_regs *  regs )

static

Definition at line 115 of file i2c.c.

References I2cConAckGen, read8(), and write8().

Referenced by i2c_recv_buf().

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i2c_ack_enable()

static void i2c_ack_enable ( struct i2c_regs *  regs )

static

Definition at line 110 of file i2c.c.

References I2cConAckGen, read8(), and write8().

Referenced by i2c_recv_buf(), and i2c_xmit_buf().

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i2c_clear_int()

static void i2c_clear_int ( struct i2c_regs *  regs )

static

Definition at line 105 of file i2c.c.

References I2cConIntPending, read8(), and write8().

Referenced by i2c_recv_buf(), i2c_send_start(), i2c_send_stop(), and i2c_xmit_buf().

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i2c_got_ack()

static int i2c_got_ack ( struct i2c_regs *  regs )

static

Definition at line 120 of file i2c.c.

References I2cStatAck, and read8().

Referenced by i2c_send_start(), and i2c_xmit_buf().

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i2c_init()

void i2c_init	(	unsigned int	bus,
		int	speed,
		int	slaveadd
	)

Definition at line 249 of file i2c.c.

i2c_int_pending()

static int i2c_int_pending ( struct i2c_regs *  regs )

static

Definition at line 100 of file i2c.c.

References I2cConIntPending, and read8().

Referenced by i2c_wait_for_int().

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i2c_recv_buf()

static int i2c_recv_buf ( struct i2c_regs *  regs, uint8_t *  data, int  len  )

static

Definition at line 198 of file i2c.c.

References ASSERT, i2c_ack_disable(), i2c_ack_enable(), i2c_clear_int(), i2c_wait_for_int(), and read8().

Referenced by platform_i2c_transfer().

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i2c_send_start()

static int i2c_send_start ( struct i2c_regs *  regs, int  read, int  chip  )

static

Definition at line 157 of file i2c.c.

References chip, i2c_clear_int(), i2c_got_ack(), I2C_TIMEOUT_US, i2c_wait_for_int(), I2cStatEnable, I2cStatMasterRecv, I2cStatMasterXmit, I2cStatStartStop, and write8().

Referenced by platform_i2c_transfer().

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i2c_send_stop()

static int i2c_send_stop ( struct i2c_regs *  regs )

static

Definition at line 149 of file i2c.c.

References i2c_clear_int(), I2C_TIMEOUT_US, i2c_wait_for_idle(), I2cStatEnable, I2cStatModeMask, read8(), and write8().

Referenced by platform_i2c_transfer().

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i2c_wait_for_idle()

static int i2c_wait_for_idle ( struct i2c_regs *  regs, int  timeout_us  )

static

Definition at line 125 of file i2c.c.

References BIOS_ERR, DIV_ROUND_UP, I2cStatBusy, printk, read8(), and udelay().

Referenced by i2c_send_stop(), and platform_i2c_transfer().

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i2c_wait_for_int()

static int i2c_wait_for_int ( struct i2c_regs *  regs, int  timeout_us  )

static

Definition at line 137 of file i2c.c.

References BIOS_ERR, DIV_ROUND_UP, i2c_int_pending(), printk, and udelay().

Referenced by i2c_recv_buf(), i2c_send_start(), and i2c_xmit_buf().

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i2c_xmit_buf()

static int i2c_xmit_buf ( struct i2c_regs *  regs, uint8_t *  data, int  len  )

static

Definition at line 175 of file i2c.c.

References ASSERT, BIOS_INFO, i2c_ack_enable(), i2c_clear_int(), i2c_got_ack(), i2c_wait_for_int(), printk, and write8().

Referenced by platform_i2c_transfer().

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platform_i2c_transfer()

int platform_i2c_transfer	(	unsigned int	bus,
		struct i2c_msg *	segments,
		int	seg_count
	)

Definition at line 219 of file i2c.c.

References i2c_msg::buf, i2c_msg::flags, i2c_busses, I2C_M_RD, i2c_recv_buf(), i2c_send_start(), i2c_send_stop(), I2C_TIMEOUT_US, i2c_wait_for_idle(), i2c_xmit_buf(), I2cStatEnable, I2cStatMasterXmit, i2c_msg::len, s3c24x0_i2c_bus::regs, i2c_msg::slave, and write8().

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Variable Documentation

i2c_busses

struct s3c24x0_i2c_bus i2c_busses[]

static

Definition at line 1 of file i2c.c.

Referenced by i2c_init(), and platform_i2c_transfer().