#ifdef CONFIG_HARD_I2C
-/*
- * - CFG_I2C_SPEED
- * - I2C_PXA_SLAVE_ADDR
+/*
+ * - CFG_I2C_SPEED
+ * - I2C_PXA_SLAVE_ADDR
*/
#include <asm/arch/hardware.h>
#include <asm/arch/pxa-regs.h>
#include <i2c.h>
-//#define DEBUG_I2C 1 /* activate local debugging output */
+/*#define DEBUG_I2C 1 /###* activate local debugging output */
#define I2C_PXA_SLAVE_ADDR 0x1 /* slave pxa unit address */
#define I2C_ICR_INIT (ICR_BEIE | ICR_IRFIE | ICR_ITEIE | ICR_GCD | ICR_SCLE)
#define I2C_ISR_INIT 0x7FF
#define I2C_COND_STOP 2
/* Shall the current transfer be ack/nacked or being waited for it? */
-#define I2C_ACKNAK_WAITACK 1
+#define I2C_ACKNAK_WAITACK 1
#define I2C_ACKNAK_SENDACK 2
#define I2C_ACKNAK_SENDNAK 4
/* All transfers are described by this data structure */
struct i2c_msg {
u8 condition;
- u8 acknack;
- u8 direction;
+ u8 acknack;
+ u8 direction;
u8 data;
};
/**
- * i2c_pxa_reset: - reset the host controller
+ * i2c_pxa_reset: - reset the host controller
*
*/
static void i2c_reset( void )
{
ICR &= ~ICR_IUE; /* disable unit */
- ICR |= ICR_UR; /* reset the unit */
- udelay(100);
- ICR &= ~ICR_IUE; /* disable unit */
- CKEN |= CKEN14_I2C; /* set the global I2C clock on */
- ISAR = I2C_PXA_SLAVE_ADDR; /* set our slave address */
- ICR = I2C_ICR_INIT; /* set control register values */
- ISR = I2C_ISR_INIT; /* set clear interrupt bits */
- ICR |= ICR_IUE; /* enable unit */
- udelay(100);
+ ICR |= ICR_UR; /* reset the unit */
+ udelay(100);
+ ICR &= ~ICR_IUE; /* disable unit */
+ CKEN |= CKEN14_I2C; /* set the global I2C clock on */
+ ISAR = I2C_PXA_SLAVE_ADDR; /* set our slave address */
+ ICR = I2C_ICR_INIT; /* set control register values */
+ ISR = I2C_ISR_INIT; /* set clear interrupt bits */
+ ICR |= ICR_IUE; /* enable unit */
+ udelay(100);
}
/**
- * i2c_isr_set_cleared: - wait until certain bits of the I2C status register
+ * i2c_isr_set_cleared: - wait until certain bits of the I2C status register
* are set and cleared
*
- * @return: 0 in case of success, 1 means timeout (no match within 10 ms).
+ * @return: 0 in case of success, 1 means timeout (no match within 10 ms).
*/
static int i2c_isr_set_cleared( unsigned long set_mask, unsigned long cleared_mask )
if( timeout-- < 0 ) return 0;
}
- return 1;
+ return 1;
}
/**
* i2c_transfer: - Transfer one byte over the i2c bus
*
- * This function can tranfer a byte over the i2c bus in both directions.
- * It is used by the public API functions.
+ * This function can tranfer a byte over the i2c bus in both directions.
+ * It is used by the public API functions.
*
* @return: 0: transfer successful
* -1: message is empty
* -4: receive timeout
* -5: illegal parameters
* -6: bus is busy and couldn't be aquired
- */
+ */
int i2c_transfer(struct i2c_msg *msg)
{
int ret;
- if (!msg)
+ if (!msg)
goto transfer_error_msg_empty;
switch(msg->direction) {
ICR &= ~ICR_STOP;
IDBR = msg->data;
if (msg->condition == I2C_COND_START) ICR |= ICR_START;
- if (msg->condition == I2C_COND_STOP) ICR |= ICR_STOP;
+ if (msg->condition == I2C_COND_STOP) ICR |= ICR_STOP;
if (msg->acknack == I2C_ACKNAK_SENDNAK) ICR |= ICR_ACKNAK;
if (msg->acknack == I2C_ACKNAK_SENDACK) ICR &= ~ICR_ACKNAK;
ICR &= ~ICR_ALDIE;
- ICR |= ICR_TB;
+ ICR |= ICR_TB;
/* transmit register empty? */
- if (!i2c_isr_set_cleared(ISR_ITE,0))
+ if (!i2c_isr_set_cleared(ISR_ITE,0))
goto transfer_error_transmit_timeout;
/* clear 'transmit empty' state */
/* wait for ACK from slave */
if (msg->acknack == I2C_ACKNAK_WAITACK)
- if (!i2c_isr_set_cleared(0,ISR_ACKNAK))
+ if (!i2c_isr_set_cleared(0,ISR_ACKNAK))
goto transfer_error_ack_missing;
break;
ICR |= ICR_TB;
/* receive register full? */
- if (!i2c_isr_set_cleared(ISR_IRF,0))
- goto transfer_error_receive_timeout;
+ if (!i2c_isr_set_cleared(ISR_IRF,0))
+ goto transfer_error_receive_timeout;
msg->data = IDBR;
}
- return 0;
+ return 0;
-transfer_error_msg_empty:
+transfer_error_msg_empty:
PRINTD(("i2c_transfer: error: 'msg' is empty\n"));
ret = -1; goto i2c_transfer_finish;
void i2c_init(int speed, int slaveaddr)
{
-#ifdef CFG_I2C_INIT_BOARD
+#ifdef CFG_I2C_INIT_BOARD
/* call board specific i2c bus reset routine before accessing the */
/* environment, which might be in a chip on that bus. For details */
/* about this problem see doc/I2C_Edge_Conditions. */
/**
* i2c_probe: - Test if a chip answers for a given i2c address
*
- * @chip: address of the chip which is searched for
+ * @chip: address of the chip which is searched for
* @return: 0 if a chip was found, -1 otherwhise
*/
* i2c_read: - Read multiple bytes from an i2c device
*
* The higher level routines take into account that this function is only
- * called with len < page length of the device (see configuration file)
+ * called with len < page length of the device (see configuration file)
*
* @chip: address of the chip which is to be read
* @addr: i2c data address within the chip
msg.data = (chip << 1);
msg.data &= 0xFE;
if ((ret=i2c_transfer(&msg))) return -1;
-
+
/*
- * send memory address bytes;
- * alen defines how much bytes we have to send.
+ * send memory address bytes;
+ * alen defines how much bytes we have to send.
*/
- //addr &= ((1 << CFG_EEPROM_PAGE_WRITE_BITS)-1);
+ /*addr &= ((1 << CFG_EEPROM_PAGE_WRITE_BITS)-1); */
addr_bytes[0] = (u8)((addr >> 0) & 0x000000FF);
addr_bytes[1] = (u8)((addr >> 8) & 0x000000FF);
addr_bytes[2] = (u8)((addr >> 16) & 0x000000FF);
msg.data = addr_bytes[alen];
if ((ret=i2c_transfer(&msg))) return -1;
}
-
+
/* start read sequence */
PRINTD(("i2c_read: start read sequence\n"));
/* read bytes; send NACK at last byte */
while (len--) {
- if (len==0) {
+ if (len==0) {
msg.condition = I2C_COND_STOP;
msg.acknack = I2C_ACKNAK_SENDNAK;
} else {
* i2c_write: - Write multiple bytes to an i2c device
*
* The higher level routines take into account that this function is only
- * called with len < page length of the device (see configuration file)
+ * called with len < page length of the device (see configuration file)
*
* @chip: address of the chip which is to be written
* @addr: i2c data address within the chip
* @alen: length of the i2c data address (1..2 bytes)
- * @buffer: where to find the data to be written
+ * @buffer: where to find the data to be written
* @len: how much byte do we want to read
* @return: 0 in case of success
*/
msg.data = (chip << 1);
msg.data &= 0xFE;
if (i2c_transfer(&msg)) return -1;
-
+
/*
- * send memory address bytes;
- * alen defines how much bytes we have to send.
+ * send memory address bytes;
+ * alen defines how much bytes we have to send.
*/
addr_bytes[0] = (u8)((addr >> 0) & 0x000000FF);
addr_bytes[1] = (u8)((addr >> 8) & 0x000000FF);
msg.data = addr_bytes[alen];
if (i2c_transfer(&msg)) return -1;
}
-
+
/* write bytes; send NACK at last byte */
while (len--) {
PRINTD(("i2c_write: writing byte (0x%08x)=0x%02x\n",(unsigned int)buffer,*buffer));
- if (len==0)
+ if (len==0)
msg.condition = I2C_COND_STOP;
else
msg.condition = I2C_COND_NORMAL;
msg.acknack = I2C_ACKNAK_WAITACK;
msg.direction = I2C_WRITE;
msg.data = *(buffer++);
-
+
if (i2c_transfer(&msg)) return -1;
}
projects / karo-tx-uboot.git / blobdiff