IDE + DMA setup - no interrupts
Posted: Tue Dec 30, 2014 7:52 am
Hello there,
I've read the following post in this forum: http://forum.osdev.org/viewtopic.php?t=19056
Unfortunately I'm facing the same problems as the author of this post (but with qemu). PIO is working but if I try to switch to UDMA/DMA I get no more interrupts.
Maybe somone has already a working driver and can help me do overcome this problem. I've tried the same things as in the above montioned post stated, so it is obviouse to me that there is something missing in the list of things todo . Ar, maybe this helps you to help: I can get interrupts when i forget to set the EOT bit in the PRD, of course no data has been transfered then.
Thx for your patience and help
Edit: Here is my code, it is only the snippet setting up the transfer, i've double checked the addresses they are fullfilling the requierment (alignment)
I've read the following post in this forum: http://forum.osdev.org/viewtopic.php?t=19056
Unfortunately I'm facing the same problems as the author of this post (but with qemu). PIO is working but if I try to switch to UDMA/DMA I get no more interrupts.
Maybe somone has already a working driver and can help me do overcome this problem. I've tried the same things as in the above montioned post stated, so it is obviouse to me that there is something missing in the list of things todo . Ar, maybe this helps you to help: I can get interrupts when i forget to set the EOT bit in the PRD, of course no data has been transfered then.
Thx for your patience and help
Edit: Here is my code, it is only the snippet setting up the transfer, i've double checked the addresses they are fullfilling the requierment (alignment)
Code: Select all
descriptors_[0].setAddress((uint32)calculatePhysicalAddressOfKernelAddress((pointer)data), num_sectors * 256);
descriptors_[0].setEot();
outbp(bus_master_base_ + BM_COMMAND, 0x0);
outportl(bus_master_base_ + BM_PRD_ADDR, (uint32)calculatePhysicalAddressOfKernelAddress((pointer)descriptors_));
outbp(bus_master_base_ + BM_COMMAND, 0x1);
outbp(port + 6, (drive | head)); // drive and head selection
outbp(port + 2, num_sectors); // number of sectors to read
outbp(port + 3, sect); // starting sector
outbp(port + 4, lo); // cylinder low
outbp(port + 5, high); // cylinder high
/* Wait for drive to set DRDY */
jiffies = 0;
while (!(inbp(port + 7) & 0x40) && jiffies++ < IO_TIMEOUT)
ArchInterrupts::yieldIfIFSet();
if (jiffies >= IO_TIMEOUT)
{
TIMEOUT_WARNING();
return -1;
}
outbp(port + 7, 0xC8);
debug("Send UDMA read request for %d sectors\n", num_sectors);