Hi,
I am writing a device driver for PCI-X card in linux. Card memory is mapped
to BAR-2 register.
I got the physical address from BAR-2 using pci_resource_start() function.
Then i try to get virtual address using ioremap_nocache(). But it returns
virtual address as 0xffffffff.Pls help me to resolve the issue./***************************************************************************
* Function Name : PCINRZProbe()
*
* Interface Description: This function is used to configure for the PCI
* NRZ Tester card device driver. This will be
* called from kernel when pci_module_init()
* called from device driver.
*
* Input Value : PCI device configuration and ID structures passed
* by kernel.
*
* Return Value : EFAIL - Device is not configured properly.
* SUCCESS -.Device is configured suceesfully
****************************************************************************/
int
__devinit PCINRZProbe(struct pci_dev *pstPciDev,
const struct pci_device_id *id){/*** To get the result **/
int16 iResult = 0;
struct page *page;
MSG("Probe Module of the PCI-NRZ is called - \n");/**** Enable the PCI device ********/
if (pci_enable_device(pstPciDev)){
MSG("PCI Tester Card Device Driver is not"
" enabled in probe function\n");
return -EIO;
}/*** Allocate the memory for PCI NRZ Tester card configuration
structure ****/
if ((pstCard = kmalloc(sizeof(struct pci_nrz), GFP_KERNEL)) == NULL)
{
MSG("Out of memory for PCI NRZ Tester card configuration\n");
return -ENOMEM;
}/** Initializing the card configuration structure memory with 0***/
memset(pstCard, 0, sizeof(*pstCard));
/* Have the link to pcidev structure */
pstCard->pstPCI_Dev = pstPciDev;/* Get the FPGA register starting address */
/*PCINRZGetBARValue(PCI_BAR_0); commented for time being *//* Get the Rx/Tx buffer starting address */
printk("About to read the BAR-2 value- ");
PCINRZGetBARValue(PCI_BAR_2);/* Get the IRQ number from PCI dev structure allocated by kernel */
iResult = pci_read_config_byte(pstPciDev,
PCI_INTERRUPT_LINE, &(pstCard->irq));
if(iResult) {
/** IRQ is not allocated **/
MSG("IRQ is not allocated for PCI NRZ Tester card\n");
kfree(pstCard);
//kfree(pstCard->RxBuffer);
//kfree(pstCard->TxBuffer);
return EFAIL;
}
MSG("IRQ number allocated for PCI Tester card DD is %d\n", pstCard->irq);
/* Set the PCI device as Master */
//pci_set_master(pstPciDev);/* Register the IRQ with ISR handler */
if (request_irq(pstCard->irq, &PCINRZisr, SA_SHIRQ,
DEVICE_NAME, pstCard)) {
MSG("Unable to register irq %d with ISR Handler \n", pstCard->irq);
kfree(pstCard);
//kfree(pstCard->RxBuffer);
//kfree(pstCard->TxBuffer);
return EFAIL;
}/* Set the driver structure */
pci_set_drvdata(pstPciDev, pstCard);/* Register char driver */pstCard->uiDevMajorNo = 0;
iResult = register_chrdev(pstCard->uiDevMajorNo,
DEVICE_NAME, &stPciNrzDrvfops);
if (iResult < 0)
{
MSG("Couldn't register PCI Tester card device driver\n");
/* Free the IRQ */
free_irq(pstCard->irq, pstCard);
/* Release the memory regions already allocated */
kfree(pstCard);
//kfree(pstCard->RxBuffer);
//kfree(pstCard->TxBuffer);
return EFAIL;
}
else
{
pstCard->uiDevMajorNo = iResult;
MSG("PCI NRZ Tester DD is registered with major number %d, %d\n",
pstCard->uiDevMajorNo, iResult);
}
/* Initialize the wait queue head */
init_waitqueue_head(&(pstCard->WaitQueue));
/* Set the flag to know that driver is registered */
pstCard->bDriverSet = TRUE;
/* Return successfully */
return SUCCESS;
}/***************************************************************************
* Function Name : PCINRZGetBARValue()
*
* Interface Description: This function is used to get the base address of
* FPGA register and base address of
* Rx/Tx Buffer.
*
* Input Value : None.
*
* Return Value : None.
*
****************************************************************************/
static void
PCINRZGetBARValue(int16 iBarNo)
{
/* Used to get the PCI configuration BAR register values */
ulong64 ulResult = 0;
if(PCI_BAR_2 == iBarNo)
{
/* Read the BAR value to get FPGA starting address */
/* Get the FPGA Base address */
ulResult = pci_resource_start(pstCard->pstPCI_Dev, PCI_BAR_2);
pstCard->uiFPGARegStartAddr = ulResult;/* Get the FPGA End address */
ulResult = pci_resource_end(pstCard->pstPCI_Dev, PCI_BAR_2);
pstCard->uiFPGARegEndAddr = ulResult;/* Get the FPGA Register length */
pstCard->uiFPGARegMemLen = pci_resource_len(pstCard->pstPCI_Dev,
PCI_BAR_2);
/* Get the FPGA Register flag - whether it is IO or memory */
pstCard->bFPGARegFlag = pci_resource_flags(pstCard->pstPCI_Dev,
PCI_BAR_2);
/* Request memory region for Tx Buffer */
if(request_mem_region(pstCard->uiFPGARegStartAddr,
pstCard->uiFPGARegMemLen, DEVICE_NAME))
{
/* Remap the physical address to virtual address
with non-cacheable*/
pstCard->uiFPGARegStartVirAddr =
ioremap(pstCard->uiFPGARegStartAddr, pstCard->uiFPGARegMemLen);
printk("Physical address of the BAR-2 is %x - \n",
pstCard->uiFPGARegStartAddr);
printk("Virtual address of the BAR-2 is %x - \n", (pstCard->uiFPGARegStartVirAddr));
printk("About to write and read ifrom FPGA Registers - \n");if(pstCard->uiFPGARegStartVirAddr)
{
writel(0xAAAA, (pstCard->uiFPGARegStartVirAddr + 0x2000));
uiResult = readl((pstCard->uiFPGARegStartVirAddr + 0x2000) );
printk("Value read from FPGA register-1 is %x - \n",uiResult);writel(0xAAAA, (pstCard->uiFPGARegStartVirAddr + 0x2004));
uiResult = readl((pstCard->uiFPGARegStartVirAddr + 0x2004) );
printk("Value read from FPGA register is %x - \n",uiResult);uiResult = readl((pstCard->uiFPGARegStartVirAddr + 0x200C) );
printk("Value read from FPGA register is %x - \n",uiResult);uiResult = readl((pstCard->uiFPGARegStartVirAddr + 0x2010) );
printk("Value read from FPGA register is %x - \n",uiResult);
}
}
}
}
Regards,
Munees.
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