The fifo size of ep0 is 64 bytes, and if the packet size grater than
64 bytes, the driver would have to fill up the fifo multiple times,
and before filling up the fifo, the driver should make sure the fifo
is empty by checking fifo empty indication.
However there is a hardware bug that the fifo empty indication is
somehow a bit earlier than fifo reset. So if I don't add an extra
delay here, the data might be corrupted. (i.e., 1 byte missing)
After a couple of tests, it truns out that 1 usec is good enough.
This workaround should be applied to all hardware revisions.
Signed-off-by: Kuo-Jung Su <dantesu@faraday-tech.com>
CC: Marek Vasut <marex@denx.de>
Since hardware revision 1.11.0, the following interrupt status
registers are now W1C (i.e., write 1 clear):
1. Interrupt Source Group 0 Register (0x144) (EP0 Abort: BIT5)
2. Interrupt Source Group 2 Register (0x14C) (All bits)
And before revision 1.11.0, these registers are all R/W.
Which means software must write a 0 to clear the status.
Signed-off-by: Kuo-Jung Su <dantesu@faraday-tech.com>
CC: Marek Vasut <marex@denx.de>
The Faraday FOTG210 is an OTG chip which could operate
as either an EHCI Host or a USB Device at a time.
Signed-off-by: Kuo-Jung Su <dantesu@faraday-tech.com>
CC: Marek Vasut <marex@denx.de>
Kuo-Jung Su
Wolfgang Denk