Use dev_phys_to_bus() to convert CPU addresses of DMA descriptors
into bus addresses of DMA descriptors. This is necessary on hardware
which does not have 1:1 mapping between CPU and memory addressed by
the DMA. This has no impact on other hardware which does not need
this conversion.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

At the very early stage when PHY ID is being auto-detected, the
PHY device is not yet instantiated and rswitch_etha .phydev is
still NULL. Add missing check for this condition and perform C22
fallback access in this PHY ID auto-detection case.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

Add support for the Renesas Ethernet Switch3 (RSW3) controller,
present in R-Car Gen5 SoCs such as R-Car X5H (R8A78000). The
hardware offset differences are handled via driver match data.

The driver newly detects whether the switch prot is connected
to xPCS or not, and if so, turns on MIOC bit 3. This is new on
R-Car X5H. GWCKSC register is also programmed only on X5H. The
rest of the operation is identical to RSwitch2.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: Tam Nguyen <tam.nguyen.xa@renesas.com>
Signed-off-by: Phong Hoang <phong.hoang.wz@renesas.com>
Signed-off-by: Thanh Quan <thanh.quan.xn@renesas.com>
Signed-off-by: Hai Pham <hai.pham.ud@renesas.com>

The MPIC_MDC_CLK clock setting value differs between R-Car S4
and R-Car X5H. Parametrize the value in preparation for R-Car
X5H addition into this driver. No functional change.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

The GWDCBAC0, GWDCBAC1, FWPBFCSDC, CABPIRM register offsets changed
between R-Car S4 and R-Car X5H. Parametrize their offsets in preparation
for R-Car X5H addition into this driver. No functional change.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

Inline FWRO, CARO, GWRO, TARO, RMRO macros directly into the
follow up register macros. FWRO, CARO, GWRO, TARO are already
zero, drop them. RMRO is 0x1000, increment all registers which
add RMRO by 0x1000 directly. No functional change.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

The forwarding engine CSD register offset changed between the
R-Car S4 and R-Car X5H. Parametrize this offset in preparation
for R-Car X5H addition into this driver. Clean up the macro
parameter names and make them more obvious. No functional change.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

The total port counts differ across variants of this IP in
R-Car S4 and R-Car X5H. Parametrize port count in preparation
for R-Car X5H addition into this driver. No functional change.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

The COMA, ETHA, GWCA offsets differ across variants of this IP in
R-Car S4 and R-Car X5H. Parametrize these offsets in preparation
for R-Car X5H addition into this driver. No functional change.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

This IP does support operating MII and SerDes via different ports.
Currently, the driver assumes that MII and SerDes are always bound
together on the same port, but this may not be the case. Implement
support for controlling MII and SerDes separately.

While the change is extensive, the gist of the change is to pass
pointer to the selected port registers to MII or SerDes functions,
depending on which port and operations should be done on that port.
Each combined ETHA instance contains both MII and SerDes register
pointers, which may not point to the same port, and passes those
registers to MII and SerDes functions respectively to control the
MII or SerDes of each port.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>