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path: root/drivers/s3c24x0_i2c.c
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Diffstat (limited to 'drivers/s3c24x0_i2c.c')
-rw-r--r--drivers/s3c24x0_i2c.c196
1 files changed, 104 insertions, 92 deletions
diff --git a/drivers/s3c24x0_i2c.c b/drivers/s3c24x0_i2c.c
index b501761..eeb6cf6 100644
--- a/drivers/s3c24x0_i2c.c
+++ b/drivers/s3c24x0_i2c.c
@@ -39,103 +39,114 @@
#ifdef CONFIG_HARD_I2C
-#define IIC_WRITE 0
-#define IIC_READ 1
+#define I2C_WRITE 0
+#define I2C_READ 1
-#define IIC_OK 0
-#define IIC_NOK 1
-#define IIC_NACK 2
-#define IIC_NOK_LA 3 /* Lost arbitration */
-#define IIC_NOK_TOUT 4 /* time out */
+#define I2C_OK 0
+#define I2C_NOK 1
+#define I2C_NACK 2
+#define I2C_NOK_LA 3 /* Lost arbitration */
+#define I2C_NOK_TOUT 4 /* time out */
-#define IICSTAT_BSY 0x20 /* Busy bit */
-#define IICSTAT_NACK 0x01 /* Nack bit */
-#define IICCON_IRPND 0x10 /* Interrupt pending bit */
-#define IIC_MODE_MT 0xC0 /* Master Transmit Mode */
-#define IIC_MODE_MR 0x80 /* Master Receive Mode */
-#define IIC_START_STOP 0x20 /* START / STOP */
-#define IIC_TXRX_ENA 0x10 /* I2C Tx/Rx enable */
+#define I2CSTAT_BSY 0x20 /* Busy bit */
+#define I2CSTAT_NACK 0x01 /* Nack bit */
+#define I2CCON_IRPND 0x10 /* Interrupt pending bit */
+#define I2C_MODE_MT 0xC0 /* Master Transmit Mode */
+#define I2C_MODE_MR 0x80 /* Master Receive Mode */
+#define I2C_START_STOP 0x20 /* START / STOP */
+#define I2C_TXRX_ENA 0x10 /* I2C Tx/Rx enable */
-#define IIC_TIMEOUT 1 /* 1 seconde */
+#define I2C_TIMEOUT 1 /* 1 seconde */
-static int GetIICSDA(void)
+static int GetI2CSDA(void)
{
- return (rGPEDAT & 0x8000) >> 15;
+ S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
+
+ return (gpio->GPEDAT & 0x8000) >> 15;
}
#if 0
-static void SetIICSDA(int x)
+static void SetI2CSDA(int x)
{
rGPEDAT = (rGPEDAT & ~0x8000) | (x&1) << 15;
}
#endif
-static void SetIICSCL(int x)
+static void SetI2CSCL(int x)
{
- rGPEDAT = (rGPEDAT & ~0x4000) | (x&1) << 14;
+ S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
+
+ gpio->GPEDAT = (gpio->GPEDAT & ~0x4000) | (x&1) << 14;
}
static int WaitForXfer(void)
{
+ S3C24X0_I2C * const i2c = S3C24X0_GetBase_I2C();
int i, status;
- i = IIC_TIMEOUT * 1000;
- status = rIICCON;
- while ((i > 0) && !(status & IICCON_IRPND)) {
+ i = I2C_TIMEOUT * 1000;
+ status = i2c->IICCON;
+ while ((i > 0) && !(status & I2CCON_IRPND)) {
udelay(1000);
- status = rIICCON;
+ status = i2c->IICCON;
i--;
}
- return(status & IICCON_IRPND) ? IIC_OK : IIC_NOK_TOUT;
+ return(status & I2CCON_IRPND) ? I2C_OK : I2C_NOK_TOUT;
}
static int IsACK(void)
{
- return(!(rIICSTAT & IICSTAT_NACK));
+ S3C24X0_I2C * const i2c = S3C24X0_GetBase_I2C();
+
+ return(!(i2c->IICSTAT & I2CSTAT_NACK));
}
static void ReadWriteByte(void)
{
- rIICCON &= ~IICCON_IRPND;
+ S3C24X0_I2C * const i2c = S3C24X0_GetBase_I2C();
+
+ i2c->IICCON &= ~I2CCON_IRPND;
}
void i2c_init (int speed, int slaveadd)
{
+ S3C24X0_I2C * const i2c = S3C24X0_GetBase_I2C();
+ S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
ulong freq, pres = 16, div;
int i, status;
/* wait for some time to give previous transfer a chance to finish */
- i = IIC_TIMEOUT * 1000;
- status = rIICSTAT;
- while ((i > 0) && (status & IICSTAT_BSY)) {
+ i = I2C_TIMEOUT * 1000;
+ status = i2c->IICSTAT;
+ while ((i > 0) && (status & I2CSTAT_BSY)) {
udelay(1000);
- status = rIICSTAT;
+ status = i2c->IICSTAT;
i--;
}
- if ((status & IICSTAT_BSY) || GetIICSDA() == 0) {
- ulong old_gpecon = rGPECON;
+ if ((status & I2CSTAT_BSY) || GetI2CSDA() == 0) {
+ ulong old_gpecon = gpio->GPECON;
/* bus still busy probably by (most) previously interrupted transfer */
- /* set IICSDA and IICSCL (GPE15, GPE14) to GPIO */
- rGPECON = (rGPECON & ~0xF0000000) | 0x10000000;
+ /* set I2CSDA and I2CSCL (GPE15, GPE14) to GPIO */
+ gpio->GPECON = (gpio->GPECON & ~0xF0000000) | 0x10000000;
- /* toggle IICSCL until bus idle */
- SetIICSCL(0); udelay(1000);
+ /* toggle I2CSCL until bus idle */
+ SetI2CSCL(0); udelay(1000);
i = 10;
- while ((i > 0) && (GetIICSDA() != 1)) {
- SetIICSCL(1); udelay(1000);
- SetIICSCL(0); udelay(1000);
+ while ((i > 0) && (GetI2CSDA() != 1)) {
+ SetI2CSCL(1); udelay(1000);
+ SetI2CSCL(0); udelay(1000);
i--;
}
- SetIICSCL(1); udelay(1000);
+ SetI2CSCL(1); udelay(1000);
/* restore pin functions */
- rGPECON = old_gpecon;
+ gpio->GPECON = old_gpecon;
}
/* calculate prescaler and divisor values */
@@ -150,13 +161,13 @@ void i2c_init (int speed, int slaveadd)
/* set prescaler, divisor according to freq, also set
ACKGEN, IRQ */
- rIICCON = (div & 0x0F) | 0xA0 | ((pres == 512) ? 0x40 : 0);
+ i2c->IICCON = (div & 0x0F) | 0xA0 | ((pres == 512) ? 0x40 : 0);
/* init to SLAVE REVEIVE and set slaveaddr */
- rIICSTAT = 0;
- rIICADD = slaveadd;
+ i2c->IICSTAT = 0;
+ i2c->IICADD = slaveadd;
/* program Master Transmit (and implicit STOP) */
- rIICSTAT = IIC_MODE_MT | IIC_TXRX_ENA;
+ i2c->IICSTAT = I2C_MODE_MT | I2C_TXRX_ENA;
}
@@ -176,142 +187,143 @@ int i2c_transfer(unsigned char cmd_type,
unsigned char data[],
unsigned short data_len)
{
+ S3C24X0_I2C * const i2c = S3C24X0_GetBase_I2C();
int i, status, result;
if (data == 0 || data_len == 0) {
/*Don't support data transfer of no length or to address 0*/
printf( "i2c_transfer: bad call\n" );
- return IIC_NOK;
+ return I2C_NOK;
}
//CheckDelay();
/* Check I2C bus idle */
- i = IIC_TIMEOUT * 1000;
- status = rIICSTAT;
- while ((i > 0) && (status & IICSTAT_BSY)) {
+ i = I2C_TIMEOUT * 1000;
+ status = i2c->IICSTAT;
+ while ((i > 0) && (status & I2CSTAT_BSY)) {
udelay(1000);
- status = rIICSTAT;
+ status = i2c->IICSTAT;
i--;
}
- if (status & IICSTAT_BSY) {
- result = IIC_NOK_TOUT;
+ if (status & I2CSTAT_BSY) {
+ result = I2C_NOK_TOUT;
return(result);
}
- rIICCON |= 0x80;
+ i2c->IICCON |= 0x80;
- result = IIC_OK;
+ result = I2C_OK;
switch (cmd_type) {
- case IIC_WRITE:
+ case I2C_WRITE:
if (addr && addr_len) {
- rIICDS = chip;
+ i2c->IICDS = chip;
/* send START */
- rIICSTAT = IIC_MODE_MT | IIC_TXRX_ENA | IIC_START_STOP;
+ i2c->IICSTAT = I2C_MODE_MT | I2C_TXRX_ENA | I2C_START_STOP;
i = 0;
- while ((i < addr_len) && (result == IIC_OK)) {
+ while ((i < addr_len) && (result == I2C_OK)) {
result = WaitForXfer();
- rIICDS = addr[i];
+ i2c->IICDS = addr[i];
ReadWriteByte();
i++;
}
i = 0;
- while ((i < data_len) && (result == IIC_OK)) {
+ while ((i < data_len) && (result == I2C_OK)) {
result = WaitForXfer();
- rIICDS = data[i];
+ i2c->IICDS = data[i];
ReadWriteByte();
i++;
}
} else {
- rIICDS = chip;
+ i2c->IICDS = chip;
/* send START */
- rIICSTAT = IIC_MODE_MT | IIC_TXRX_ENA | IIC_START_STOP;
+ i2c->IICSTAT = I2C_MODE_MT | I2C_TXRX_ENA | I2C_START_STOP;
i = 0;
- while ((i < data_len) && (result = IIC_OK)) {
+ while ((i < data_len) && (result = I2C_OK)) {
result = WaitForXfer();
- rIICDS = data[i];
+ i2c->IICDS = data[i];
ReadWriteByte();
i++;
}
}
- if (result == IIC_OK)
+ if (result == I2C_OK)
result = WaitForXfer();
/* send STOP */
- rIICSTAT = IIC_MODE_MR | IIC_TXRX_ENA;
+ i2c->IICSTAT = I2C_MODE_MR | I2C_TXRX_ENA;
ReadWriteByte();
break;
- case IIC_READ:
+ case I2C_READ:
if (addr && addr_len) {
- rIICSTAT = IIC_MODE_MT | IIC_TXRX_ENA;
- rIICDS = chip;
+ i2c->IICSTAT = I2C_MODE_MT | I2C_TXRX_ENA;
+ i2c->IICDS = chip;
/* send START */
- rIICSTAT |= IIC_START_STOP;
+ i2c->IICSTAT |= I2C_START_STOP;
result = WaitForXfer();
if (IsACK()) {
i = 0;
- while ((i < addr_len) && (result == IIC_OK)) {
- rIICDS = addr[i];
+ while ((i < addr_len) && (result == I2C_OK)) {
+ i2c->IICDS = addr[i];
ReadWriteByte();
result = WaitForXfer();
i++;
}
- rIICDS = chip;
+ i2c->IICDS = chip;
/* resend START */
- rIICSTAT = IIC_MODE_MR | IIC_TXRX_ENA | IIC_START_STOP;
+ i2c->IICSTAT = I2C_MODE_MR | I2C_TXRX_ENA | I2C_START_STOP;
ReadWriteByte();
result = WaitForXfer();
i = 0;
- while ((i < data_len) && (result == IIC_OK)) {
+ while ((i < data_len) && (result == I2C_OK)) {
/* disable ACK for final READ */
if (i == data_len - 1)
- rIICCON &= ~0x80;
+ i2c->IICCON &= ~0x80;
ReadWriteByte();
result = WaitForXfer();
- data[i] = rIICDS;
+ data[i] = i2c->IICDS;
i++;
}
} else {
- result = IIC_NACK;
+ result = I2C_NACK;
}
} else {
- rIICSTAT = IIC_MODE_MR | IIC_TXRX_ENA;
- rIICDS = chip;
+ i2c->IICSTAT = I2C_MODE_MR | I2C_TXRX_ENA;
+ i2c->IICDS = chip;
/* send START */
- rIICSTAT |= IIC_START_STOP;
+ i2c->IICSTAT |= I2C_START_STOP;
result = WaitForXfer();
if (IsACK()) {
i = 0;
- while ((i < data_len) && (result == IIC_OK)) {
+ while ((i < data_len) && (result == I2C_OK)) {
/* disable ACK for final READ */
if (i == data_len - 1)
- rIICCON &= ~0x80;
+ i2c->IICCON &= ~0x80;
ReadWriteByte();
result = WaitForXfer();
- data[i] = rIICDS;
+ data[i] = i2c->IICDS;
i++;
}
} else {
- result = IIC_NACK;
+ result = I2C_NACK;
}
}
/* send STOP */
- rIICSTAT = IIC_MODE_MR | IIC_TXRX_ENA;
+ i2c->IICSTAT = I2C_MODE_MR | I2C_TXRX_ENA;
ReadWriteByte();
break;
default:
printf( "i2c_transfer: bad call\n" );
- result = IIC_NOK;
+ result = I2C_NOK;
break;
}
@@ -329,7 +341,7 @@ int i2c_probe (uchar chip)
* address was <ACK>ed (i.e. there was a chip at that address which
* drove the data line low).
*/
- return(i2c_transfer (IIC_READ, chip << 1, 0, 0, buf, 1) != IIC_OK);
+ return(i2c_transfer (I2C_READ, chip << 1, 0, 0, buf, 1) != I2C_OK);
}
int i2c_read (uchar chip, uint addr, int alen, uchar * buffer, int len)
@@ -365,7 +377,7 @@ int i2c_read (uchar chip, uint addr, int alen, uchar * buffer, int len)
if( alen > 0 )
chip |= ((addr >> (alen * 8)) & CFG_I2C_EEPROM_ADDR_OVERFLOW);
#endif
- if( (ret = i2c_transfer(IIC_READ, chip<<1, &xaddr[4-alen], alen, buffer, len )) != 0) {
+ if( (ret = i2c_transfer(I2C_READ, chip<<1, &xaddr[4-alen], alen, buffer, len )) != 0) {
printf( "I2c read: failed %d\n", ret);
return 1;
}
@@ -403,7 +415,7 @@ int i2c_write (uchar chip, uint addr, int alen, uchar * buffer, int len)
if( alen > 0 )
chip |= ((addr >> (alen * 8)) & CFG_I2C_EEPROM_ADDR_OVERFLOW);
#endif
- return (i2c_transfer(IIC_WRITE, chip<<1, &xaddr[4-alen], alen, buffer, len ) != 0);
+ return (i2c_transfer(I2C_WRITE, chip<<1, &xaddr[4-alen], alen, buffer, len ) != 0);
}
#endif /* CONFIG_HARD_I2C */
generated by cgit v1.1 at 2024-11-22 23:01:03 +0000