/*
* Iic Post Initialization Procedure
* Need to be called after Interrupt system is configured.
*/
int IicInitPost(XIic *IicInstPtr) {
// Setup Handlers for transmit and reception
XIic_SetSendHandler(IicInstPtr, IicInstPtr, (XIic_Handler) IicSendHandler);
XIic_SetRecvHandler(IicInstPtr, IicInstPtr, (XIic_Handler) IicRecvHandler);
XIic_SetStatusHandler(IicInstPtr, IicInstPtr, (XIic_StatusHandler) IicStatusHandler);
// Release reset on the PCA9548 IIC Switch
XIic_SetGpOutput(IicInstPtr, 0xFF);
XIic_SetGpOutput(IicInstPtr, 0x00);
return XST_SUCCESS;
}
/** Shared device initialization code */
static int __devinit xilinx_iic_setup(
struct device *device,
struct device_node *node,
struct resource *r_mem,
struct resource *r_irq,
u32 ten_bit_addr,
u32 gpo_width) {
XIic_Config xiic_cfg;
struct xiic_data *dev;
char *scan_results;
int error;
/* Allocate the dev and zero it out. */
dev = kmalloc(sizeof(struct xiic_data), GFP_KERNEL);
if (!dev) {
dev_err(device, "Cannot allocate struct xiic_data\n");
error = -ENOMEM;
goto out2;
}
memset(dev, 0, sizeof(struct xiic_data));
dev_set_drvdata(device, dev);
dev->irq = r_irq->start;
/* initialize fields to satisfy i2c */
dev->index = 0;
init_completion(&dev->complete);
memset(&xiic_cfg, 0, sizeof(XIic_Config));
xiic_cfg.DeviceId = 0;
/* Change the addresses to be virtual; save the old ones to restore. */
dev->base = r_mem->start;
xiic_cfg.BaseAddress =
(u32) ioremap(r_mem->start, r_mem->end - r_mem->start + 1);
dev->remapped = 1;
down(&cfg_sem);
xiic_cfg.Has10BitAddr = (int)ten_bit_addr;
xiic_cfg.GpOutWidth = (u8)gpo_width;
/* Tell the Xilinx code to bring this IIC interface up. */
if (XIic_CfgInitialize(&dev->Iic, &xiic_cfg, xiic_cfg.BaseAddress) !=
XST_SUCCESS) {
up(&cfg_sem);
dev_err(device, "could not initialize device.\n");
error = -ENODEV;
goto out;
}
up(&cfg_sem);
XIic_SetRecvHandler(&dev->Iic, (void *)dev, RecvHandler);
XIic_SetSendHandler(&dev->Iic, (void *)dev, SendHandler);
XIic_SetStatusHandler(&dev->Iic, (void *)dev, StatusHandler);
/* Grab the IRQ */
error = request_irq(dev->irq, xiic_interrupt, 0, dev->adap.name, dev);
if (error) {
dev_err(device, "could not allocate interrupt %d.\n", dev->irq);
goto out;
}
dev->reqirq = 1;
if (XIic_Start(&dev->Iic) != XST_SUCCESS) {
dev_err(device, "could not start device\n");
error = -ENODEV;
goto out;
}
dev->started = 1;
/* Now tell the core I2C code about our new device. */
strcpy(dev->adap.name, "xilinx-iic");
dev->adap.dev.of_node = node;
dev->adap.algo = &xiic_algo;
dev->adap.algo_data = NULL;
dev->adap.timeout = XIIC_TIMEOUT;
dev->adap.retries = XIIC_RETRY;
error = i2c_add_adapter(&dev->adap);
if (error) {
dev_err(device, "could not add i2c adapter\n");
goto out;
}
dev->added = 1;
printk("%s #%d at 0x%08X mapped to 0x%08X, irq=%d\n",
dev->adap.name, dev->index,
dev->base, (unsigned int)dev->Iic.BaseAddress, dev->irq);
if (scan) {
scan_results = xilinx_iic_do_scan(dev);
if (scan_results) {
printk(scan_results);
kfree(scan_results);
}
}
of_i2c_register_devices(&dev->adap);
error = device_create_file(device, &dev_attr_scan);
out:
if (error)
xilinx_iic_remove(device);
out2:
return error;
}
static int __init xilinx_iic_probe(struct of_device *of_dev,
const struct of_device_id *match)
{
XIic_Config xiic_cfg;
struct xiic_data *dev;
char *scan_results;
struct resource mem;
struct device_node *dev_node = of_dev->node;
int error;
const u32 *did;
/* Allocate the dev and zero it out. */
dev = kzalloc(sizeof(struct xiic_data), SLAB_KERNEL);
if (!dev) {
dev_err(&of_dev->dev, "Cannot allocate struct xiic_data\n");
error = -ENOMEM;
goto out2;
}
dev_set_drvdata(&of_dev->dev, dev);
/* get resources from device tree */
dev->irq = irq_of_parse_and_map(dev_node, 0);
if (dev->irq == 0 /* NOIRQ */ ) {
error = -ENODEV;
goto out;
}
if (of_address_to_resource(dev_node, 0, &mem)) {
error = -ENODEV;
goto out;
}
/* initialize fields to satisfy i2c */
strcpy(dev->adap.name, of_dev->dev.bus_id);
did = of_get_property(dev_node, "index", NULL);
if (did == NULL) {
printk
("%s: Can not get device index from device tree, assume 0\n",
__FUNCTION__);
dev->index = 0;
} else
dev->index = *did;
init_completion(&dev->complete);
memset(&xiic_cfg, 0, sizeof(XIic_Config));
xiic_cfg.DeviceId = dev->index;
/* Change the addresses to be virtual; save the old ones to restore. */
dev->base = mem.start;
xiic_cfg.BaseAddress =
(u32) ioremap(mem.start, mem.end - mem.start + 1);
dev->remapped = 1;
down(&cfg_sem);
/* Tell the Xilinx code to bring this IIC interface up. */
if (XIic_CfgInitialize(&dev->Iic, &xiic_cfg, xiic_cfg.BaseAddress) !=
XST_SUCCESS) {
up(&cfg_sem);
dev_err(&of_dev->dev, "could not initialize device.\n");
error = -ENODEV;
goto out;
}
up(&cfg_sem);
XIic_SetRecvHandler(&dev->Iic, (void *)dev, RecvHandler);
XIic_SetSendHandler(&dev->Iic, (void *)dev, SendHandler);
XIic_SetStatusHandler(&dev->Iic, (void *)dev, StatusHandler);
/* Grab the IRQ */
error = request_irq(dev->irq, xiic_interrupt, 0, dev->adap.name, dev);
if (error) {
dev_err(&of_dev->dev, "could not allocate interrupt %d.\n",
dev->irq);
goto out;
}
dev->reqirq = 1;
if (XIic_Start(&dev->Iic) != XST_SUCCESS) {
dev_err(&of_dev->dev, "could not start device\n");
error = -ENODEV;
goto out;
}
dev->started = 1;
/* Now tell the core I2C code about our new device. */
/*
* SAATODO: Get a real ID (perhaps I2C_HW_XILINX) after
* initial release. Will need to email [email protected]
* per http://www2.lm-sensors.nu/~lm78/support.html
*/
dev->adap.id = I2C_DRIVERID_I2CDEV;
dev->adap.algo = &xiic_algo;
dev->adap.algo_data = NULL;
dev->adap.timeout = XIIC_TIMEOUT;
dev->adap.retries = XIIC_RETRY;
error = i2c_add_adapter(&dev->adap);
if (error) {
dev_err(&of_dev->dev, "could not add i2c adapter\n");
goto out;
}
dev->added = 1;
printk("%s #%d at 0x%08X mapped to 0x%08X, irq=%d\n",
dev->adap.name, dev->index,
dev->base, dev->Iic.BaseAddress, dev->irq);
if (scan) {
scan_results = xilinx_iic_do_scan(dev);
if (scan_results) {
printk(scan_results);
kfree(scan_results);
}
}
device_create_file(&of_dev->dev, &dev_attr_scan);
out:
if (error)
xilinx_iic_remove(of_dev);
out2:
return error;
}
static int __init xilinx_iic_probe(struct device *device)
{
XIic_Config xiic_cfg;
struct platform_device *pdev = to_platform_device(device);
struct xiic_data *dev;
char *scan_results;
struct resource *mem;
int error;
/* Allocate the dev and zero it out. */
dev = kzalloc(sizeof(struct xiic_data), SLAB_KERNEL);
if (!dev) {
dev_err(device, "Cannot allocate struct xiic_data\n");
error = -ENOMEM;
goto out2;
}
dev_set_drvdata(device, dev);
/* get resources from resource list of passed platform_device */
dev->irq = platform_get_irq(pdev, 0);
if (dev->irq == 0 /* NOIRQ */ ) {
error = -ENODEV;
goto out;
}
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem) {
error = -ENODEV;
goto out;
}
/* initialize fields to satisfy i2c */
strcpy(dev->adap.name, device->bus_id);
dev->index = pdev->id;
init_completion(&dev->complete);
memset(&xiic_cfg, 0, sizeof(XIic_Config));
xiic_cfg.DeviceId = pdev->id;
/* Change the addresses to be virtual; save the old ones to restore. */
dev->base = mem->start;
xiic_cfg.BaseAddress =
(u32) ioremap(mem->start, mem->end - mem->start + 1);
dev->remapped = 1;
down(&cfg_sem);
/* Tell the Xilinx code to bring this IIC interface up. */
if (XIic_CfgInitialize(&dev->Iic, &xiic_cfg, xiic_cfg.BaseAddress) !=
XST_SUCCESS) {
up(&cfg_sem);
dev_err(device, "could not initialize device.\n");
error = -ENODEV;
goto out;
}
up(&cfg_sem);
XIic_SetRecvHandler(&dev->Iic, (void *)dev, RecvHandler);
XIic_SetSendHandler(&dev->Iic, (void *)dev, SendHandler);
XIic_SetStatusHandler(&dev->Iic, (void *)dev, StatusHandler);
/* Grab the IRQ */
error = request_irq(dev->irq, xiic_interrupt, 0, dev->adap.name, dev);
if (error) {
dev_err(device, "could not allocate interrupt %d.\n", dev->irq);
goto out;
}
dev->reqirq = 1;
if (XIic_Start(&dev->Iic) != XST_SUCCESS) {
dev_err(device, "could not start device\n");
error = -ENODEV;
goto out;
}
dev->started = 1;
/* Now tell the core I2C code about our new device. */
/*
* SAATODO: Get a real ID (perhaps I2C_HW_XILINX) after
* initial release. Will need to email [email protected]
* per http://www2.lm-sensors.nu/~lm78/support.html
*/
dev->adap.id = xiic_algo.id | I2C_DRIVERID_EXP0;
dev->adap.algo = &xiic_algo;
dev->adap.algo_data = NULL;
dev->adap.timeout = XIIC_TIMEOUT;
dev->adap.retries = XIIC_RETRY;
error = i2c_add_adapter(&dev->adap);
if (error) {
dev_err(device, "could not add i2c adapter\n");
goto out;
}
dev->added = 1;
printk("%s #%d at 0x%08X mapped to 0x%08X, irq=%d\n",
dev->adap.name, dev->index,
dev->base, dev->Iic.BaseAddress, dev->irq);
if (scan) {
scan_results = xilinx_iic_do_scan(dev);
if (scan_results) {
printk(scan_results);
kfree(scan_results);
}
}
device_create_file(device, &dev_attr_scan);
out:
if (error)
xilinx_iic_remove(device);
out2:
return error;
}
/**
* The function reads the temperature of the IIC temperature sensor on the
* IIC bus. It initializes the IIC device driver and sets it up to communicate
* with the temperature sensor. This function does contain a loop that polls
* for completion of the IIC processing such that it may not return if
* interrupts or the hardware are not working.
*
* @param IicDeviceId is the XPAR_<IIC_instance>_DEVICE_ID value from
* xparameters.h for the IIC Device
* @param TempSensorAddress is the address of the Temperature Sensor device
* on the IIC bus
* @param TemperaturePtr is the data byte read from the temperature sensor
*
* @return XST_SUCCESS to indicate success, else XST_FAILURE to indicate
* a Failure.
*
* @note None.
*
*******************************************************************************/
int TempSensorExample(u16 IicDeviceId, u8 TempSensorAddress, u8 *TemperaturePtr)
{
int Status;
static int Initialized = FALSE;
XIic_Config *ConfigPtr; /* Pointer to configuration data */
if (!Initialized) {
Initialized = TRUE;
/*
* Initialize the IIC driver so that it is ready to use.
*/
ConfigPtr = XIic_LookupConfig(IicDeviceId);
if (ConfigPtr == NULL) {
return XST_FAILURE;
}
Status = XIic_CfgInitialize(&Iic, ConfigPtr,
ConfigPtr->BaseAddress);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Setup handler to process the asynchronous events which occur,
* the driver is only interrupt driven such that this must be
* done prior to starting the device.
*/
XIic_SetRecvHandler(&Iic, (void *)&HandlerInfo, RecvHandler);
XIic_SetStatusHandler(&Iic, (void *)&HandlerInfo,
StatusHandler);
/*
* Connect the ISR to the interrupt and enable interrupts.
*/
Status = SetupInterruptSystem(&Iic);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Start the IIC driver such that it is ready to send and
* receive messages on the IIC interface, set the address
* to send to which is the temperature sensor address
*/
XIic_Start(&Iic);
XIic_SetAddress(&Iic, XII_ADDR_TO_SEND_TYPE, TempSensorAddress);
}
/*
* Clear updated flags such that they can be polled to indicate
* when the handler information has changed asynchronously and
* initialize the status which will be returned to a default value
*/
HandlerInfo.EventStatusUpdated = FALSE;
HandlerInfo.RecvBytesUpdated = FALSE;
Status = XST_FAILURE;
/*
* Attempt to receive a byte of data from the temperature sensor
* on the IIC interface, ignore the return value since this example is
* a single master system such that the IIC bus should not ever be busy
*/
(void)XIic_MasterRecv(&Iic, TemperaturePtr, 1);
/*
* The message is being received from the temperature sensor,
* wait for it to complete by polling the information that is
* updated asynchronously by interrupt processing
*/
while(1) {
if(HandlerInfo.RecvBytesUpdated == TRUE) {
/*
* The device information has been updated for receive
* processing,if all bytes received (1), indicate
* success
*/
if (HandlerInfo.RemainingRecvBytes == 0) {
Status = XST_SUCCESS;
}
break;
}
/*
* Any event status which occurs indicates there was an error,
* so return unsuccessful, for this example there should be no
* status events since there is a single master on the bus
*/
if (HandlerInfo.EventStatusUpdated == TRUE) {
break;
}
}
return Status;
}
/* TMP3_SetupInterruptSystem()
**
** Parameters:
** InstancePtr: PmodTMP3 object to get data from
** interruptDeviceID: Device ID of the interrupt controller
** interruptID: The vector ID of the TMP3 I2C interrupt
**
** Return Value:
** A status indicating XST_SUCCESS or a value that is contained in
** xstatus.h.
**
** Errors:
** none
**
** Description:
** This function sets up the interrupt system for the example. The processing
** contained in this function assumes the hardware system was built with
** and interrupt controller.
**
*****************************************************************************/
int TMP3_SetupInterruptSystem(PmodTMP3* InstancePtr, u32 interruptDeviceID, u32 interruptID, void* SendHandler, void* ReceiveHandler)
{
int Result;
#ifdef XPAR_XINTC_NUM_INSTANCES
INTC *IntcInstancePtr = &InstancePtr->intc;
/*
* Initialize the interrupt controller driver so that it's ready to use.
* specify the device ID that was generated in xparameters.h
*/
Result = XIntc_Initialize(IntcInstancePtr, interruptDeviceID);
if (Result != XST_SUCCESS) {
return Result;
}
/* Hook up interrupt service routine */
XIntc_Connect(IntcInstancePtr, interruptID,
(Xil_ExceptionHandler)XIic_InterruptHandler, &InstancePtr->TMP3Iic);
/* Enable the interrupt vector at the interrupt controller */
XIntc_Enable(IntcInstancePtr, interruptID);
/*
* Start the interrupt controller such that interrupts are recognized
* and handled by the processor
*/
Result = XIntc_Start(IntcInstancePtr, XIN_REAL_MODE);
if (Result != XST_SUCCESS) {
return Result;
}
XIic_SetSendHandler(&InstancePtr->TMP3Iic, InstancePtr, (XIic_Handler)SendHandler);
XIic_SetRecvHandler(&InstancePtr->TMP3Iic, InstancePtr, (XIic_Handler)ReceiveHandler);
/*
* Initialize the exception table and register the interrupt
* controller handler with the exception table
*/
Xil_ExceptionInit();
Xil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_INT,
(Xil_ExceptionHandler)INTC_HANDLER, IntcInstancePtr);
/* Enable non-critical exceptions */
Xil_ExceptionEnable();
#endif
#ifdef XPAR_SCUGIC_0_DEVICE_ID
INTC *IntcInstancePtr = &InstancePtr->intc;
XScuGic_Config *IntcConfig;
/*
* Initialize the interrupt controller driver so that it is ready to
* use.
*/
IntcConfig = XScuGic_LookupConfig(interruptDeviceID);
if (NULL == IntcConfig) {
return XST_FAILURE;
}
Result = XScuGic_CfgInitialize(IntcInstancePtr, IntcConfig,
IntcConfig->CpuBaseAddress);
if (Result != XST_SUCCESS) {
return XST_FAILURE;
}
XScuGic_SetPriorityTriggerType(IntcInstancePtr, interruptID,
0xA0, 0x3);
/*
* Connect the interrupt handler that will be called when an
* interrupt occurs for the device.
*/
Result = XScuGic_Connect(IntcInstancePtr, interruptID,
(Xil_ExceptionHandler)XIic_InterruptHandler, &InstancePtr->TMP3Iic);
if (Result != XST_SUCCESS) {
return Result;
}
/*
* Enable the interrupt for the device.
*/
XScuGic_Enable(IntcInstancePtr, interruptID);
XIic_SetSendHandler(&InstancePtr->TMP3Iic, InstancePtr, (XIic_Handler)SendHandler);
XIic_SetRecvHandler(&InstancePtr->TMP3Iic, InstancePtr, (XIic_Handler)ReceiveHandler);
XIic_SetStatusHandler(&InstancePtr->TMP3Iic, InstancePtr, (XIic_Handler)StatusHandler);
/*
* Initialize the exception table and register the interrupt
* controller handler with the exception table
*/
Xil_ExceptionInit();
Xil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_INT,
(Xil_ExceptionHandler)INTC_HANDLER, IntcInstancePtr);
/* Enable non-critical exceptions */
Xil_ExceptionEnable();
#endif
return XST_SUCCESS;
}
