Hello All:
I have been tasked with writing a driver for my companies digital radio.
The card has 16K of PCI space at BAR0. I need to memory map this into user
space, and provide DMA and isr handling. First things first i want to get
the mapping working. When i run the code below after inserting the module
i seg. fault. I know this is what happens when engineers have to write
code, but can someone point me in the right direction?
Thanks!!!
/Patrick
+========================================================+
Patrick Jennings | jennings@red-river.com
Red River | Direct Phone (972) 671-9636
Radio Products Group | Main Phone (972) 671-9570
797 North Grove Road | Fax (972) 671-9572
Suite 101 | www.red-river.com
Richardson,TX 75081 |
[driver.c]
#define VEND_ID 0x1171
#define DEV_ID 0xA050
#define CARD_NAME "Model 300"
#define M300_MAJOR 240
int redriver_init_module(void)
{
int status;
struct pci_dev *pcidev=NULL;
unsigned long databuf;
printk("<1>Red River Module Init\n");
SET_MODULE_OWNER(&redriver_fops);
pcidev = pci_find_device(VEND_ID, DEV_ID, pcidev);
if(pcidev == NULL)
{
printk("<1>Couldn't find a red river device\n");
return ENODEV;
}
status = pci_enable_device(pcidev);
if(status)
{
printk("<1>Error enabling device\n");
return(status);
}
status = register_chrdev(M300_MAJOR, CARD_NAME, &redriver_fops);
if(status)
{
printk("<1>Couldn't register najor number for %s\n", CARD_NAME);
}
redriver_device_data.io_base_start = (unsigned long
*)pci_resource_start(pcidev, 0);
redriver_device_data.io_base_stop = (unsigned long
*)pci_resource_end(pcidev, 0);
printk("M300:IO_BASE: 0x%x\n", redriver_device_data.io_base_start);
databuf = *(redriver_device_data.io_base_start+(0x590));
printk("Firm rev register 0x%x\n",databuf);
return 0;
}
int redriver_remap_mmap(struct file * flip, struct vm_area_struct *vma)
{
vma->vm_flags |= (VM_RESERVED | VM_IO);
if(remap_page_range(vma->vm_start, redriver_device_data.io_base_start,
vma->vm_end-vma->vm_start,vma->vm_page_prot))
return -EAGAIN;
vma->vm_ops = &redriver_remap_vm_ops;
redriver_vma_open(vma);
return 0;
}
module_init(redriver_init_module);
module_exit(redriver_cleanup_module);
[testprog.c]
int main(void)
{
int fd;
unsigned long *vadr;
unsigned long read_data;
printf("%s\n",PROG_NAME);
printf("%s\n",__DATE__);
fd = open("/dev/model300_0", O_RDWR);
if(fd == -1)
{
printf("Error opening device\n");
return(-1);
}
else
{
printf("Device opend OK\n");
}
vadr = mmap(NULL, 0x, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
if(vadr)
{
printf("Error opening memory!\n");
exit(-1);
}
read_data = *(vadr+0x590/4) //Read 0x590 firm reg register
printf("Data is 0x%x\n",read_data);
close(fd);
return(0);
}
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This archive was generated by hypermail 2b29 : Mon Oct 07 2002 - 22:00:59 EST