- if supported, override BSY/DRQ flags and start the port anyway if it
times out with DET=3h status during device detection;
- no longer rely on the device signature to be set; unless a valid
signature is obtained, try both ATA and ATAPI device identification.
- do not start a port before the BSY and DRQ flags have been cleared;
as such, poll on device status rather than signature availability.
- change "ahci_sig_timeout" to "ahci_device_timeout" variable setting
accordingly; this variable determines the polling duration before a
newly attached device is given up on, and uses 30 seconds as default;
- use port connect changes (PCS/X/DET->1h) to kick off polling for an
attached device; detachment is still detected by means of PhyRdy
status changes (PRCS/N/DET<->3h).
- the "ahci_sig_timeout" variable now denotes the entire checking
period, and the delay between checks has been hardcoded; what was
previously "ahci_sig_checks" is now computed from those two;
- timeout values are no longer used for both millisecond and clock
tick values, and better typed;
- the computation of timeouts is no longer off by half a second.
This patch adds support for executing multiple concurrent requests on
different devices on the same AHCI controller. The libdriver library
has been extended to include a generic multithreading interface, and
the AHCI driver has been extended to make use of this interface.
The original version of this code has been written by Arne Welzel.
- check the DF status flag after each command
- increase I/O timeout from 15 to 30 seconds
- share some code between ATA and ATAPI after all
- produce more accurate errors on DIOCEJECT
- rename AHCI_ID_SIZE to the more appropriate ATA_ID_SIZE
- rearrange ahci.h in a now more sensible way
