I'm stuck trying to get this to work and I don't know why what I am
doing doesn't work. I'm hoping maybe someone on here has a suggestion.
The piece of code below is suppose to take a PADDR and memory map it to
a kernel address. The output I get from the code below is shown here:
PCI: Enabling device: (0002:08:00.0), cmd 3
vm_area->phys_addr=0x0008080100040000
vaddr=0x0000000136180000
nr_pages=32
page protection =0x9C08080100040690
I/O address location mapped
ioread32 RegBase[0] = 0x00000000
vread RegBase[0] = 0x00000000
PCI: Enabling device: (0002:09:00.0), cmd 3
vm_area->phys_addr=0x0008080110040000
vaddr=0x0000000136200000
nr_pages=32
page protection =0x9C08080110040690
I/O address location mapped
ioread32 RegBase[0] = 0x00000000
vread RegBase[0] = 0x00000000
PCI: Enabling device: (0002:0a:00.0), cmd 3
vm_area->phys_addr=0x0008080120040000
vaddr=0x0000000136280000
nr_pages=32
page protection =0x9C08080120040690
I/O address location mapped
ioread32 RegBase[0] = 0x00000000
vread RegBase[0] = 0x00000000
PCI: Enabling device: (0002:0b:00.0), cmd 3
vm_area->phys_addr=0x0008080130040000
vaddr=0x0000000136300000
nr_pages=32
page protection =0x9C08080130040690
I/O address location mapped
ioread32 RegBase[0] = 0x00000000
vread RegBase[0] = 0x00000000
I know I should be getting 0x00EA0408 from RegBase[0].
Do you see anything obvious that is wrong?
void __iomem *ioremap_prefetch(unsigned long offset, unsigned long size)
{
struct vm_struct *vm_area = NULL;
unsigned long vaddr;
int error = 0, tmp_val;
pgprot_t prot = __pgprot(pgprot_val(PAGE_SHARED) |
(_PAGE_PADDR_4V &
offset));
void __iomem *ret_addr;
/*
* Get Contiguous Kernel Virtual Memory Area. Note:
get_vm_area will
* page align the area to use.
*/
vm_area = get_vm_area(size, VM_IOREMAP | VM_NO_GUARD);
if (!vm_area) {
printk("Unable to allocate Contiguous Virtual Memory
for Mapping
\n");
error = 1;
goto done;
}
vm_area->phys_addr = (phys_addr_t)offset;
vm_area->nr_pages = size / PAGE_SIZE;
vaddr = (unsigned long)vm_area->addr;
printk("vm_area->phys_addr=0x%016llX\n", (unsigned long
long)vm_area->ph
ys_addr);
printk("vaddr=0x%016llX\n", (unsigned long long)vaddr);
printk("nr_pages=%d\n", vm_area->nr_pages);
printk("page protection =0x%08lX\n", (unsigned
long)pgprot_val(prot));
if(ioremap_page_range((unsigned long)vm_area->addr,
(unsigned long)vm_area->addr + size,
vm_area->phys_addr, prot)) {
printk("Unable to Map Page Range.\n");
error = 1;
goto done;
}
else {
printk("I/O address location mapped\n");
ret_addr = vm_area->addr;
printk("ioread32 RegBase[0] = 0x%08X\n",
ioread32(ret_addr));
vread((char *)&tmp_val, ret_addr, 4);
printk("vread RegBase[0] = 0x%08X\n", tmp_val);
}
done:
if(error) {
/*
* Cleanup After oneself
*/
free_vm_area(vm_area);
ret_addr = 0;
}
return (ret_addr);
//return ((void __iomem *)offset);
}
Thanks In Advance,
Joe
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