I have been struggling with creating a driver for my FPGA card. My issue seems
to be that I haven't been able to pass the pointer information for the pci_dev.
When registering the device there is no way, from my limited understanding, to
attach information to the device that is created, in my case /dev/rtdm/cms_fpga
.
So while the pci_probe works fine and show me the address of BAR0 there is no
way to pass that data to my .open or .ioctl_rt. I tried creating my stucture
globally but that didn't seem to help. The following is a sample of the module
as it currently is, any help would be greatly appreciated.
struct cms_fpga_struct
{
rtdm_lock_t lock;
struct pci_dev *pcidev;
resource_size_t mmio;
struct cms_fpga_context context;
};
static struct cms_fpga_struct *fpga ;
static struct pci_device_id pci_ids[] =
{
{
PCI_DEVICE(0x1204, 0xec30),
//.driver_data = (unsigned long)&fpga
},
{}
};
static struct rtdm_driver CMS_Xenomai_Driver =
{
.profile_info = RTDM_PROFILE_INFO(cms,
RTDM_CLASS_EXPERIMENTAL,
1,
1),
.device_flags = RTDM_NAMED_DEVICE|RTDM_EXCLUSIVE,
.device_count = 1,
.context_size = sizeof(struct cms_fpga_struct),
.ops =
{
.open = cms_open,
.ioctl_rt = cms_ioctl,
.ioctl_nrt= cms_ioctl,
.write_rt = NULL , //pci_write,
.write_nrt= NULL ,
.read_rt = NULL , //pci_read,
.read_nrt = NULL
}
};
static int pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
int ret;
int err = 0 ;
static struct cms_fpga_struct *fpga;
rtdm_printk (KERN_DEBUG "Probe 1 %llx", fpga);
struct rtdm_device *dev;
dev = kmalloc(sizeof(struct rtdm_device) + RTDM_MAX_DEVNAME_LEN, GFP_KERNEL);
fpga = kmalloc(sizeof(struct cms_fpga_struct), GFP_KERNEL);
if(!dev) goto out; //cleanup;
dev->driver = &CMS_Xenomai_Driver;
dev->label = "cms_fpga";
dev->device_data=(unsigned long long *)fpga;
rtdm_printk(KERN_DEBUG "Probe 2 %llx", fpga);
ret = rtdm_dev_register(dev);
// if(!id->driver_data)
// {
// rtdm_printk(KERN_DEBUG "No id->driver_data");
// return -ENODEV;
// }
// fpga = id->driver_data;
rtdm_printk (KERN_DEBUG "Probe 3 %llx", fpga);
if(fpga == NULL)
{
rtdm_printk(KERN_DEBUG "fpga == NULL");
return -ENOMEM;
}
//memset(fpga, 0, sizeof(struct cms_fpga_struct));
rtdm_lock_init(&fpga->lock);
if (pci_enable_device(pdev) < 0)
{
rtdm_printk(KERN_ERR "FPGA PCI Not enableded");
goto out;
}
fpga->pcidev = pdev;
ret = pci_request_region(pdev, BAR_MEM, "CMS-FPGA");
if(ret < 0)
{
rtdm_printk(KERN_DEBUG "Request region failed @ %0x", fpga->mmio);
}
fpga->mmio=pci_resource_start(pdev,BAR_MEM);
dev_info(&(pdev->dev), "MMIO starts at %llx", fpga->mmio);
rtdm_printk(KERN_DEBUG "Probe 4 %llx", dev->device_data);
return err;
out:
kfree(fpga);
return -1;
}
NOTICE: This e-mail message and all attachments transmitted with it may contain
trade secrets and confidential information intended solely for the use of the
addressee. If the reader of this message is not the intended recipient, you are
hereby notified that any reading, dissemination, distribution, copying, or
other use of this message or its attachments is strictly prohibited. If you
have received this message in error, please notify the sender immediately by
telephone at 407-679-9716, and delete this message and all copies and backups
thereof. Thank you
