diff options
Diffstat (limited to 'drivers/staging/sm750fb/ddk750_swi2c.c')
| -rw-r--r-- | drivers/staging/sm750fb/ddk750_swi2c.c | 448 |
1 files changed, 218 insertions, 230 deletions
diff --git a/drivers/staging/sm750fb/ddk750_swi2c.c b/drivers/staging/sm750fb/ddk750_swi2c.c index 901b3737f1ed..5133bccf17bd 100644 --- a/drivers/staging/sm750fb/ddk750_swi2c.c +++ b/drivers/staging/sm750fb/ddk750_swi2c.c @@ -96,15 +96,14 @@ static void swI2CWait(void) it's more reliable than counter loop .. write 0x61 to 0x3ce and read from 0x3cf */ - while(peekIO(0x3ce,0x61) & 0x10); + while (peekIO(0x3ce, 0x61) & 0x10); #else - int i, Temp; + int i, Temp; - for(i=0; i<600; i++) - { - Temp = i; - Temp += i; - } + for (i = 0; i < 600; i++) { + Temp = i; + Temp += i; + } #endif } @@ -122,27 +121,24 @@ static void swI2CWait(void) */ void swI2CSCL(unsigned char value) { - unsigned long ulGPIOData; - unsigned long ulGPIODirection; - - ulGPIODirection = PEEK32(g_i2cClkGPIODataDirReg); - if (value) /* High */ - { - /* Set direction as input. This will automatically pull the signal up. */ - ulGPIODirection &= ~(1 << g_i2cClockGPIO); - POKE32(g_i2cClkGPIODataDirReg, ulGPIODirection); - } - else /* Low */ - { - /* Set the signal down */ - ulGPIOData = PEEK32(g_i2cClkGPIODataReg); - ulGPIOData &= ~(1 << g_i2cClockGPIO); - POKE32(g_i2cClkGPIODataReg, ulGPIOData); - - /* Set direction as output */ - ulGPIODirection |= (1 << g_i2cClockGPIO); - POKE32(g_i2cClkGPIODataDirReg, ulGPIODirection); - } + unsigned long ulGPIOData; + unsigned long ulGPIODirection; + + ulGPIODirection = PEEK32(g_i2cClkGPIODataDirReg); + if (value) { /* High */ + /* Set direction as input. This will automatically pull the signal up. */ + ulGPIODirection &= ~(1 << g_i2cClockGPIO); + POKE32(g_i2cClkGPIODataDirReg, ulGPIODirection); + } else { /* Low */ + /* Set the signal down */ + ulGPIOData = PEEK32(g_i2cClkGPIODataReg); + ulGPIOData &= ~(1 << g_i2cClockGPIO); + POKE32(g_i2cClkGPIODataReg, ulGPIOData); + + /* Set direction as output */ + ulGPIODirection |= (1 << g_i2cClockGPIO); + POKE32(g_i2cClkGPIODataDirReg, ulGPIODirection); + } } /* @@ -159,27 +155,24 @@ void swI2CSCL(unsigned char value) */ void swI2CSDA(unsigned char value) { - unsigned long ulGPIOData; - unsigned long ulGPIODirection; - - ulGPIODirection = PEEK32(g_i2cDataGPIODataDirReg); - if (value) /* High */ - { - /* Set direction as input. This will automatically pull the signal up. */ - ulGPIODirection &= ~(1 << g_i2cDataGPIO); - POKE32(g_i2cDataGPIODataDirReg, ulGPIODirection); - } - else /* Low */ - { - /* Set the signal down */ - ulGPIOData = PEEK32(g_i2cDataGPIODataReg); - ulGPIOData &= ~(1 << g_i2cDataGPIO); - POKE32(g_i2cDataGPIODataReg, ulGPIOData); - - /* Set direction as output */ - ulGPIODirection |= (1 << g_i2cDataGPIO); - POKE32(g_i2cDataGPIODataDirReg, ulGPIODirection); - } + unsigned long ulGPIOData; + unsigned long ulGPIODirection; + + ulGPIODirection = PEEK32(g_i2cDataGPIODataDirReg); + if (value) { /* High */ + /* Set direction as input. This will automatically pull the signal up. */ + ulGPIODirection &= ~(1 << g_i2cDataGPIO); + POKE32(g_i2cDataGPIODataDirReg, ulGPIODirection); + } else { /* Low */ + /* Set the signal down */ + ulGPIOData = PEEK32(g_i2cDataGPIODataReg); + ulGPIOData &= ~(1 << g_i2cDataGPIO); + POKE32(g_i2cDataGPIODataReg, ulGPIOData); + + /* Set direction as output */ + ulGPIODirection |= (1 << g_i2cDataGPIO); + POKE32(g_i2cDataGPIODataDirReg, ulGPIODirection); + } } /* @@ -190,23 +183,22 @@ void swI2CSDA(unsigned char value) */ static unsigned char swI2CReadSDA(void) { - unsigned long ulGPIODirection; - unsigned long ulGPIOData; - - /* Make sure that the direction is input (High) */ - ulGPIODirection = PEEK32(g_i2cDataGPIODataDirReg); - if ((ulGPIODirection & (1 << g_i2cDataGPIO)) != (~(1 << g_i2cDataGPIO))) - { - ulGPIODirection &= ~(1 << g_i2cDataGPIO); - POKE32(g_i2cDataGPIODataDirReg, ulGPIODirection); - } - - /* Now read the SDA line */ - ulGPIOData = PEEK32(g_i2cDataGPIODataReg); - if (ulGPIOData & (1 << g_i2cDataGPIO)) - return 1; - else - return 0; + unsigned long ulGPIODirection; + unsigned long ulGPIOData; + + /* Make sure that the direction is input (High) */ + ulGPIODirection = PEEK32(g_i2cDataGPIODataDirReg); + if ((ulGPIODirection & (1 << g_i2cDataGPIO)) != (~(1 << g_i2cDataGPIO))) { + ulGPIODirection &= ~(1 << g_i2cDataGPIO); + POKE32(g_i2cDataGPIODataDirReg, ulGPIODirection); + } + + /* Now read the SDA line */ + ulGPIOData = PEEK32(g_i2cDataGPIODataReg); + if (ulGPIOData & (1 << g_i2cDataGPIO)) + return 1; + else + return 0; } /* @@ -214,7 +206,7 @@ static unsigned char swI2CReadSDA(void) */ static void swI2CAck(void) { - return; /* Single byte read is ok without it. */ + return; /* Single byte read is ok without it. */ } /* @@ -222,10 +214,10 @@ static void swI2CAck(void) */ static void swI2CStart(void) { - /* Start I2C */ - swI2CSDA(1); - swI2CSCL(1); - swI2CSDA(0); + /* Start I2C */ + swI2CSDA(1); + swI2CSCL(1); + swI2CSDA(0); } /* @@ -233,10 +225,10 @@ static void swI2CStart(void) */ static void swI2CStop(void) { - /* Stop the I2C */ - swI2CSCL(1); - swI2CSDA(0); - swI2CSDA(1); + /* Stop the I2C */ + swI2CSCL(1); + swI2CSDA(0); + swI2CSDA(1); } /* @@ -251,60 +243,58 @@ static void swI2CStop(void) */ static long swI2CWriteByte(unsigned char data) { - unsigned char value = data; - int i; - - /* Sending the data bit by bit */ - for (i=0; i<8; i++) - { - /* Set SCL to low */ - swI2CSCL(0); - - /* Send data bit */ - if ((value & 0x80) != 0) - swI2CSDA(1); - else - swI2CSDA(0); - - swI2CWait(); - - /* Toggle clk line to one */ - swI2CSCL(1); - swI2CWait(); - - /* Shift byte to be sent */ - value = value << 1; - } - - /* Set the SCL Low and SDA High (prepare to get input) */ - swI2CSCL(0); - swI2CSDA(1); - - /* Set the SCL High for ack */ - swI2CWait(); - swI2CSCL(1); - swI2CWait(); - - /* Read SDA, until SDA==0 */ - for(i=0; i<0xff; i++) - { - if (!swI2CReadSDA()) - break; - - swI2CSCL(0); - swI2CWait(); - swI2CSCL(1); - swI2CWait(); - } - - /* Set the SCL Low and SDA High */ - swI2CSCL(0); - swI2CSDA(1); - - if (i<0xff) - return 0; - else - return -1; + unsigned char value = data; + int i; + + /* Sending the data bit by bit */ + for (i = 0; i < 8; i++) { + /* Set SCL to low */ + swI2CSCL(0); + + /* Send data bit */ + if ((value & 0x80) != 0) + swI2CSDA(1); + else + swI2CSDA(0); + + swI2CWait(); + + /* Toggle clk line to one */ + swI2CSCL(1); + swI2CWait(); + + /* Shift byte to be sent */ + value = value << 1; + } + + /* Set the SCL Low and SDA High (prepare to get input) */ + swI2CSCL(0); + swI2CSDA(1); + + /* Set the SCL High for ack */ + swI2CWait(); + swI2CSCL(1); + swI2CWait(); + + /* Read SDA, until SDA==0 */ + for (i = 0; i < 0xff; i++) { + if (!swI2CReadSDA()) + break; + + swI2CSCL(0); + swI2CWait(); + swI2CSCL(1); + swI2CWait(); + } + + /* Set the SCL Low and SDA High */ + swI2CSCL(0); + swI2CSDA(1); + + if (i < 0xff) + return 0; + else + return -1; } /* @@ -319,32 +309,31 @@ static long swI2CWriteByte(unsigned char data) */ static unsigned char swI2CReadByte(unsigned char ack) { - int i; - unsigned char data = 0; + int i; + unsigned char data = 0; - for(i=7; i>=0; i--) - { - /* Set the SCL to Low and SDA to High (Input) */ - swI2CSCL(0); - swI2CSDA(1); - swI2CWait(); + for (i = 7; i >= 0; i--) { + /* Set the SCL to Low and SDA to High (Input) */ + swI2CSCL(0); + swI2CSDA(1); + swI2CWait(); - /* Set the SCL High */ - swI2CSCL(1); - swI2CWait(); + /* Set the SCL High */ + swI2CSCL(1); + swI2CWait(); - /* Read data bits from SDA */ - data |= (swI2CReadSDA() << i); - } + /* Read data bits from SDA */ + data |= (swI2CReadSDA() << i); + } - if (ack) - swI2CAck(); + if (ack) + swI2CAck(); - /* Set the SCL Low and SDA High */ - swI2CSCL(0); - swI2CSDA(1); + /* Set the SCL Low and SDA High */ + swI2CSCL(0); + swI2CSDA(1); - return data; + return data; } /* @@ -361,29 +350,29 @@ static unsigned char swI2CReadByte(unsigned char ack) static long swI2CInit_SM750LE(unsigned char i2cClkGPIO, unsigned char i2cDataGPIO) { - int i; + int i; - /* Initialize the GPIO pin for the i2c Clock Register */ - g_i2cClkGPIODataReg = GPIO_DATA_SM750LE; - g_i2cClkGPIODataDirReg = GPIO_DATA_DIRECTION_SM750LE; + /* Initialize the GPIO pin for the i2c Clock Register */ + g_i2cClkGPIODataReg = GPIO_DATA_SM750LE; + g_i2cClkGPIODataDirReg = GPIO_DATA_DIRECTION_SM750LE; - /* Initialize the Clock GPIO Offset */ - g_i2cClockGPIO = i2cClkGPIO; + /* Initialize the Clock GPIO Offset */ + g_i2cClockGPIO = i2cClkGPIO; - /* Initialize the GPIO pin for the i2c Data Register */ - g_i2cDataGPIODataReg = GPIO_DATA_SM750LE; - g_i2cDataGPIODataDirReg = GPIO_DATA_DIRECTION_SM750LE; + /* Initialize the GPIO pin for the i2c Data Register */ + g_i2cDataGPIODataReg = GPIO_DATA_SM750LE; + g_i2cDataGPIODataDirReg = GPIO_DATA_DIRECTION_SM750LE; - /* Initialize the Data GPIO Offset */ - g_i2cDataGPIO = i2cDataGPIO; + /* Initialize the Data GPIO Offset */ + g_i2cDataGPIO = i2cDataGPIO; - /* Note that SM750LE don't have GPIO MUX and power is always on */ + /* Note that SM750LE don't have GPIO MUX and power is always on */ - /* Clear the i2c lines. */ - for(i=0; i<9; i++) - swI2CStop(); + /* Clear the i2c lines. */ + for (i = 0; i < 9; i++) + swI2CStop(); - return 0; + return 0; } /* @@ -398,49 +387,49 @@ static long swI2CInit_SM750LE(unsigned char i2cClkGPIO, * 0 - Success */ long swI2CInit( - unsigned char i2cClkGPIO, - unsigned char i2cDataGPIO + unsigned char i2cClkGPIO, + unsigned char i2cDataGPIO ) { - int i; + int i; - /* Return 0 if the GPIO pins to be used is out of range. The range is only from [0..63] */ - if ((i2cClkGPIO > 31) || (i2cDataGPIO > 31)) - return -1; + /* Return 0 if the GPIO pins to be used is out of range. The range is only from [0..63] */ + if ((i2cClkGPIO > 31) || (i2cDataGPIO > 31)) + return -1; - if (getChipType() == SM750LE) - return swI2CInit_SM750LE(i2cClkGPIO, i2cDataGPIO); + if (getChipType() == SM750LE) + return swI2CInit_SM750LE(i2cClkGPIO, i2cDataGPIO); - /* Initialize the GPIO pin for the i2c Clock Register */ - g_i2cClkGPIOMuxReg = GPIO_MUX; - g_i2cClkGPIODataReg = GPIO_DATA; - g_i2cClkGPIODataDirReg = GPIO_DATA_DIRECTION; + /* Initialize the GPIO pin for the i2c Clock Register */ + g_i2cClkGPIOMuxReg = GPIO_MUX; + g_i2cClkGPIODataReg = GPIO_DATA; + g_i2cClkGPIODataDirReg = GPIO_DATA_DIRECTION; - /* Initialize the Clock GPIO Offset */ - g_i2cClockGPIO = i2cClkGPIO; + /* Initialize the Clock GPIO Offset */ + g_i2cClockGPIO = i2cClkGPIO; - /* Initialize the GPIO pin for the i2c Data Register */ - g_i2cDataGPIOMuxReg = GPIO_MUX; - g_i2cDataGPIODataReg = GPIO_DATA; - g_i2cDataGPIODataDirReg = GPIO_DATA_DIRECTION; + /* Initialize the GPIO pin for the i2c Data Register */ + g_i2cDataGPIOMuxReg = GPIO_MUX; + g_i2cDataGPIODataReg = GPIO_DATA; + g_i2cDataGPIODataDirReg = GPIO_DATA_DIRECTION; - /* Initialize the Data GPIO Offset */ - g_i2cDataGPIO = i2cDataGPIO; + /* Initialize the Data GPIO Offset */ + g_i2cDataGPIO = i2cDataGPIO; - /* Enable the GPIO pins for the i2c Clock and Data (GPIO MUX) */ - POKE32(g_i2cClkGPIOMuxReg, - PEEK32(g_i2cClkGPIOMuxReg) & ~(1 << g_i2cClockGPIO)); - POKE32(g_i2cDataGPIOMuxReg, - PEEK32(g_i2cDataGPIOMuxReg) & ~(1 << g_i2cDataGPIO)); + /* Enable the GPIO pins for the i2c Clock and Data (GPIO MUX) */ + POKE32(g_i2cClkGPIOMuxReg, + PEEK32(g_i2cClkGPIOMuxReg) & ~(1 << g_i2cClockGPIO)); + POKE32(g_i2cDataGPIOMuxReg, + PEEK32(g_i2cDataGPIOMuxReg) & ~(1 << g_i2cDataGPIO)); - /* Enable GPIO power */ - enableGPIO(1); + /* Enable GPIO power */ + enableGPIO(1); - /* Clear the i2c lines. */ - for(i=0; i<9; i++) - swI2CStop(); + /* Clear the i2c lines. */ + for (i = 0; i < 9; i++) + swI2CStop(); - return 0; + return 0; } /* @@ -455,30 +444,30 @@ long swI2CInit( * Register value */ unsigned char swI2CReadReg( - unsigned char deviceAddress, - unsigned char registerIndex + unsigned char deviceAddress, + unsigned char registerIndex ) { - unsigned char data; + unsigned char data; - /* Send the Start signal */ - swI2CStart(); + /* Send the Start signal */ + swI2CStart(); - /* Send the device address */ - swI2CWriteByte(deviceAddress); + /* Send the device address */ + swI2CWriteByte(deviceAddress); - /* Send the register index */ - swI2CWriteByte(registerIndex); + /* Send the register index */ + swI2CWriteByte(registerIndex); - /* Get the bus again and get the data from the device read address */ - swI2CStart(); - swI2CWriteByte(deviceAddress + 1); - data = swI2CReadByte(1); + /* Get the bus again and get the data from the device read address */ + swI2CStart(); + swI2CWriteByte(deviceAddress + 1); + data = swI2CReadByte(1); - /* Stop swI2C and release the bus */ - swI2CStop(); + /* Stop swI2C and release the bus */ + swI2CStop(); - return data; + return data; } /* @@ -495,28 +484,27 @@ unsigned char swI2CReadReg( * -1 - Fail */ long swI2CWriteReg( - unsigned char deviceAddress, - unsigned char registerIndex, - unsigned char data + unsigned char deviceAddress, + unsigned char registerIndex, + unsigned char data ) { - long returnValue = 0; + long returnValue = 0; - /* Send the Start signal */ - swI2CStart(); + /* Send the Start signal */ + swI2CStart(); - /* Send the device address and read the data. All should return success - in order for the writing processed to be successful - */ - if ((swI2CWriteByte(deviceAddress) != 0) || - (swI2CWriteByte(registerIndex) != 0) || - (swI2CWriteByte(data) != 0)) - { - returnValue = -1; - } + /* Send the device address and read the data. All should return success + in order for the writing processed to be successful + */ + if ((swI2CWriteByte(deviceAddress) != 0) || + (swI2CWriteByte(registerIndex) != 0) || + (swI2CWriteByte(data) != 0)) { + returnValue = -1; + } - /* Stop i2c and release the bus */ - swI2CStop(); + /* Stop i2c and release the bus */ + swI2CStop(); - return returnValue; + return returnValue; } |