aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/staging/sm750fb/ddk750_hwi2c.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/staging/sm750fb/ddk750_hwi2c.c')
-rw-r--r--drivers/staging/sm750fb/ddk750_hwi2c.c244
1 files changed, 121 insertions, 123 deletions
diff --git a/drivers/staging/sm750fb/ddk750_hwi2c.c b/drivers/staging/sm750fb/ddk750_hwi2c.c
index 7826376ed705..5ddac430aea2 100644
--- a/drivers/staging/sm750fb/ddk750_hwi2c.c
+++ b/drivers/staging/sm750fb/ddk750_hwi2c.c
@@ -10,70 +10,70 @@
int hwI2CInit(
- unsigned char busSpeedMode
+unsigned char busSpeedMode
)
{
- unsigned int value;
+ unsigned int value;
- /* Enable GPIO 30 & 31 as IIC clock & data */
+ /* Enable GPIO 30 & 31 as IIC clock & data */
value = PEEK32(GPIO_MUX);
- value = FIELD_SET(value, GPIO_MUX, 30, I2C) |
- FIELD_SET(0, GPIO_MUX, 31, I2C);
+ value = FIELD_SET(value, GPIO_MUX, 30, I2C) |
+ FIELD_SET(0, GPIO_MUX, 31, I2C);
POKE32(GPIO_MUX, value);
- /* Enable Hardware I2C power.
- TODO: Check if we need to enable GPIO power?
- */
- enableI2C(1);
-
- /* Enable the I2C Controller and set the bus speed mode */
- value = PEEK32(I2C_CTRL);
- if (busSpeedMode == 0)
- value = FIELD_SET(value, I2C_CTRL, MODE, STANDARD);
- else
- value = FIELD_SET(value, I2C_CTRL, MODE, FAST);
- value = FIELD_SET(value, I2C_CTRL, EN, ENABLE);
- POKE32(I2C_CTRL, value);
-
- return 0;
+ /* Enable Hardware I2C power.
+ TODO: Check if we need to enable GPIO power?
+ */
+ enableI2C(1);
+
+ /* Enable the I2C Controller and set the bus speed mode */
+ value = PEEK32(I2C_CTRL);
+ if (busSpeedMode == 0)
+ value = FIELD_SET(value, I2C_CTRL, MODE, STANDARD);
+ else
+ value = FIELD_SET(value, I2C_CTRL, MODE, FAST);
+ value = FIELD_SET(value, I2C_CTRL, EN, ENABLE);
+ POKE32(I2C_CTRL, value);
+
+ return 0;
}
void hwI2CClose(void)
{
- unsigned int value;
+ unsigned int value;
- /* Disable I2C controller */
- value = PEEK32(I2C_CTRL);
- value = FIELD_SET(value, I2C_CTRL, EN, DISABLE);
- POKE32(I2C_CTRL, value);
+ /* Disable I2C controller */
+ value = PEEK32(I2C_CTRL);
+ value = FIELD_SET(value, I2C_CTRL, EN, DISABLE);
+ POKE32(I2C_CTRL, value);
- /* Disable I2C Power */
- enableI2C(0);
+ /* Disable I2C Power */
+ enableI2C(0);
- /* Set GPIO 30 & 31 back as GPIO pins */
- value = PEEK32(GPIO_MUX);
- value = FIELD_SET(value, GPIO_MUX, 30, GPIO);
- value = FIELD_SET(value, GPIO_MUX, 31, GPIO);
- POKE32(GPIO_MUX, value);
+ /* Set GPIO 30 & 31 back as GPIO pins */
+ value = PEEK32(GPIO_MUX);
+ value = FIELD_SET(value, GPIO_MUX, 30, GPIO);
+ value = FIELD_SET(value, GPIO_MUX, 31, GPIO);
+ POKE32(GPIO_MUX, value);
}
static long hwI2CWaitTXDone(void)
{
- unsigned int timeout;
+ unsigned int timeout;
- /* Wait until the transfer is completed. */
- timeout = HWI2C_WAIT_TIMEOUT;
+ /* Wait until the transfer is completed. */
+ timeout = HWI2C_WAIT_TIMEOUT;
while ((FIELD_GET(PEEK32(I2C_STATUS), I2C_STATUS, TX) != I2C_STATUS_TX_COMPLETED) &&
- (timeout != 0))
+ (timeout != 0))
timeout--;
if (timeout == 0)
- return (-1);
+ return (-1);
- return 0;
+ return 0;
}
@@ -91,53 +91,52 @@ static long hwI2CWaitTXDone(void)
* Total number of bytes those are actually written.
*/
static unsigned int hwI2CWriteData(
- unsigned char deviceAddress,
- unsigned int length,
- unsigned char *pBuffer
+ unsigned char deviceAddress,
+ unsigned int length,
+ unsigned char *pBuffer
)
{
- unsigned char count, i;
- unsigned int totalBytes = 0;
+ unsigned char count, i;
+ unsigned int totalBytes = 0;
- /* Set the Device Address */
- POKE32(I2C_SLAVE_ADDRESS, deviceAddress & ~0x01);
+ /* Set the Device Address */
+ POKE32(I2C_SLAVE_ADDRESS, deviceAddress & ~0x01);
- /* Write data.
- * Note:
- * Only 16 byte can be accessed per i2c start instruction.
- */
- do
- {
- /* Reset I2C by writing 0 to I2C_RESET register to clear the previous status. */
- POKE32(I2C_RESET, 0);
+ /* Write data.
+ * Note:
+ * Only 16 byte can be accessed per i2c start instruction.
+ */
+ do {
+ /* Reset I2C by writing 0 to I2C_RESET register to clear the previous status. */
+ POKE32(I2C_RESET, 0);
- /* Set the number of bytes to be written */
- if (length < MAX_HWI2C_FIFO)
- count = length - 1;
- else
- count = MAX_HWI2C_FIFO - 1;
- POKE32(I2C_BYTE_COUNT, count);
+ /* Set the number of bytes to be written */
+ if (length < MAX_HWI2C_FIFO)
+ count = length - 1;
+ else
+ count = MAX_HWI2C_FIFO - 1;
+ POKE32(I2C_BYTE_COUNT, count);
- /* Move the data to the I2C data register */
- for (i = 0; i <= count; i++)
- POKE32(I2C_DATA0 + i, *pBuffer++);
+ /* Move the data to the I2C data register */
+ for (i = 0; i <= count; i++)
+ POKE32(I2C_DATA0 + i, *pBuffer++);
- /* Start the I2C */
- POKE32(I2C_CTRL, FIELD_SET(PEEK32(I2C_CTRL), I2C_CTRL, CTRL, START));
+ /* Start the I2C */
+ POKE32(I2C_CTRL, FIELD_SET(PEEK32(I2C_CTRL), I2C_CTRL, CTRL, START));
- /* Wait until the transfer is completed. */
- if (hwI2CWaitTXDone() != 0)
- break;
+ /* Wait until the transfer is completed. */
+ if (hwI2CWaitTXDone() != 0)
+ break;
- /* Substract length */
- length -= (count + 1);
+ /* Substract length */
+ length -= (count + 1);
- /* Total byte written */
- totalBytes += (count + 1);
+ /* Total byte written */
+ totalBytes += (count + 1);
- } while (length > 0);
+ } while (length > 0);
- return totalBytes;
+ return totalBytes;
}
@@ -158,53 +157,52 @@ static unsigned int hwI2CWriteData(
* Total number of actual bytes read from the slave device
*/
static unsigned int hwI2CReadData(
- unsigned char deviceAddress,
- unsigned int length,
- unsigned char *pBuffer
+ unsigned char deviceAddress,
+ unsigned int length,
+ unsigned char *pBuffer
)
{
- unsigned char count, i;
- unsigned int totalBytes = 0;
+ unsigned char count, i;
+ unsigned int totalBytes = 0;
- /* Set the Device Address */
- POKE32(I2C_SLAVE_ADDRESS, deviceAddress | 0x01);
+ /* Set the Device Address */
+ POKE32(I2C_SLAVE_ADDRESS, deviceAddress | 0x01);
- /* Read data and save them to the buffer.
- * Note:
- * Only 16 byte can be accessed per i2c start instruction.
- */
- do
- {
- /* Reset I2C by writing 0 to I2C_RESET register to clear all the status. */
- POKE32(I2C_RESET, 0);
+ /* Read data and save them to the buffer.
+ * Note:
+ * Only 16 byte can be accessed per i2c start instruction.
+ */
+ do {
+ /* Reset I2C by writing 0 to I2C_RESET register to clear all the status. */
+ POKE32(I2C_RESET, 0);
- /* Set the number of bytes to be read */
- if (length <= MAX_HWI2C_FIFO)
- count = length - 1;
- else
- count = MAX_HWI2C_FIFO - 1;
- POKE32(I2C_BYTE_COUNT, count);
+ /* Set the number of bytes to be read */
+ if (length <= MAX_HWI2C_FIFO)
+ count = length - 1;
+ else
+ count = MAX_HWI2C_FIFO - 1;
+ POKE32(I2C_BYTE_COUNT, count);
- /* Start the I2C */
- POKE32(I2C_CTRL, FIELD_SET(PEEK32(I2C_CTRL), I2C_CTRL, CTRL, START));
+ /* Start the I2C */
+ POKE32(I2C_CTRL, FIELD_SET(PEEK32(I2C_CTRL), I2C_CTRL, CTRL, START));
- /* Wait until transaction done. */
- if (hwI2CWaitTXDone() != 0)
- break;
+ /* Wait until transaction done. */
+ if (hwI2CWaitTXDone() != 0)
+ break;
- /* Save the data to the given buffer */
- for (i = 0; i <= count; i++)
- *pBuffer++ = PEEK32(I2C_DATA0 + i);
+ /* Save the data to the given buffer */
+ for (i = 0; i <= count; i++)
+ *pBuffer++ = PEEK32(I2C_DATA0 + i);
- /* Substract length by 16 */
- length -= (count + 1);
+ /* Substract length by 16 */
+ length -= (count + 1);
- /* Number of bytes read. */
- totalBytes += (count + 1);
+ /* Number of bytes read. */
+ totalBytes += (count + 1);
- } while (length > 0);
+ } while (length > 0);
- return totalBytes;
+ return totalBytes;
}
@@ -222,16 +220,16 @@ static unsigned int hwI2CReadData(
* Register value
*/
unsigned char hwI2CReadReg(
- unsigned char deviceAddress,
- unsigned char registerIndex
+ unsigned char deviceAddress,
+ unsigned char registerIndex
)
{
- unsigned char value = (0xFF);
+ unsigned char value = (0xFF);
- if (hwI2CWriteData(deviceAddress, 1, &registerIndex) == 1)
- hwI2CReadData(deviceAddress, 1, &value);
+ if (hwI2CWriteData(deviceAddress, 1, &registerIndex) == 1)
+ hwI2CReadData(deviceAddress, 1, &value);
- return value;
+ return value;
}
@@ -252,19 +250,19 @@ unsigned char hwI2CReadReg(
* -1 - Fail
*/
int hwI2CWriteReg(
- unsigned char deviceAddress,
- unsigned char registerIndex,
- unsigned char data
+ unsigned char deviceAddress,
+ unsigned char registerIndex,
+ unsigned char data
)
{
- unsigned char value[2];
+ unsigned char value[2];
- value[0] = registerIndex;
- value[1] = data;
- if (hwI2CWriteData(deviceAddress, 2, value) == 2)
- return 0;
+ value[0] = registerIndex;
+ value[1] = data;
+ if (hwI2CWriteData(deviceAddress, 2, value) == 2)
+ return 0;
- return (-1);
+ return (-1);
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.