According to the OPEN Alliance 10Base-T1x standard (point 7.7), it is
mandatory to read at least single data chunk (no matter if received data
is valid or not) to deassert the interrupt in the LAN865x (then the tc6
structure fields are also updated from the footer).
Current approach with reading OA_BUFSTS register was providing the
required information (RCA and TXC), but could cause transmission "stalls"
as this operation (i.e. control, not data transmission) is not causing
deassertion of the interrupt IRQ_N line from OA TC6 compliant device.
With this patch - the transmission is always performed at least once, so
interrupt is always deasserted.
As the functionality of oa_tc6_update_buf_info() - i.e reading value of
RCA and TXC - has been replaced with extracting data from footer, this
function can be safely removed.
Signed-off-by: Lukasz Majewski <lukma@denx.de>
The code to handle OA TC6 compliant device's status is generic and can
be moved to device agnostic driver (oa_tc6.c).
Moreover, the original code has been augmented with LOG_WRN() messages.
Signed-off-by: Lukasz Majewski <lukma@denx.de>
The RCA and RBA fields in OA_BUFSTS register are stored with 8 bits each.
On the other hand, when one receives those values in footer, the value
is saturated to 5 bits due to 32 bit size constrain of the footer itself.
To avoid any mismatches - the values read from OA_BUFSTS are saturated
as well.
Signed-off-by: Lukasz Majewski <lukma@denx.de>
Zephyr's network stack has issues with network IP header split across
fragments.
To alleviate this problem, the frame would be now aligned to first byte
of the chunk. This would ensure that the header is stored at one network
buffer fragment (as we explicitly set its size to 64B).
Signed-off-by: Lukasz Majewski <lukma@denx.de>
The OA TC6 driver requires some bits manipulations in control registers.
Up till now - it has been implemented as an explicit set of read and write
registers' operations.
One good example would be the oa_tc6_set_protected_ctrl() implementation,
which used such scheme.
This patch brings dedicated function for this operation; oa_tc6_reg_rmw().
The aforementioned oa_tc6_set_protected_ctrl() function now uses it
internally.
Signed-off-by: Lukasz Majewski <lukma@denx.de>
Those files provide generic functions to handle transmission between chip
conforming OA TC6 standard and Zephyr's network stack represented by
struct net_pkt.
The communication is performed via SPI and is focused on reduced memory
footprint (works with SOC equipped with 32 KiB of RAM) and robustness of
operation.
Signed-off-by: Lukasz Majewski <lukma@denx.de>
