litmus-rt-ext-res.git/drivers/net/ethernet/faraday, branch EXT-RES

net/faraday: Stop NCSI device on shutdown

2016-10-04T06:11:51+00:00

This stops NCSI device when closing the network device so that the
NCSI device can be reenabled later.

Signed-off-by: Gavin Shan 
Reviewed-by: Joel Stanley 
Signed-off-by: David S. Miller

net/faraday: Mask out PHYSTS_CHG interrupt

2016-09-22T07:31:14+00:00

The PHYSTS_CHG (the ftgmac100's PHY IRQ) is telling the system to go
look at the PHY registers for a link status change.

The interrupt was causing issues on Aspeed SoC where some board designs
had an active high configuration, some active low, and in some cases
repurposed for other functions. When misconfigured Linux would chew 100%
of CPU cycles servicing interrupts:

 [   20.280000] ftgmac100 1e660000.ethernet eth0: [ISR] = 0x200: PHYSTS_CHG
 [   20.280000] ftgmac100 1e660000.ethernet eth0: [ISR] = 0x200: PHYSTS_CHG
 [   20.280000] ftgmac100 1e660000.ethernet eth0: [ISR] = 0x200: PHYSTS_CHG
 [   20.300000] ftgmac100 1e660000.ethernet eth0: [ISR] = 0x200: PHYSTS_CHG

While in the ftgmac100 IP can be configured for high, low and edge
sensitivity the current driver always polls the PHY, so we chose to mask
out the interrupt.

See https://patchwork.ozlabs.org/patch/672099/ for more discussion.

Signed-off-by: Joel Stanley 
Signed-off-by: David S. Miller

net/faraday: Configure old MDIO interface on Aspeed SoCs

2016-09-22T07:31:14+00:00

The Aspeed SoCs have a new MDIO interface as an option in the G4 and G5
SoCs. The old one is still available, so select it in order to remain
compatible with the ftgmac100 driver.

Signed-off-by: Joel Stanley 
Signed-off-by: David S. Miller

net/faraday: Clear stale interrupts

2016-09-22T07:31:14+00:00

There is stale interrupt (PHYSTS_CHG in ISR, bit#6 in 0x0) from
the bootloader (uboot) when enabling the MAC. The stale interrupts
aren't part of kernel and should be cleared.

This clears the stale interrupts in ISR (0x0) when enabling the MAC.

Signed-off-by: Gavin Shan 
Signed-off-by: Joel Stanley 
Signed-off-by: David S. Miller

net/faraday: Adapt for Aspeed SoCs

2016-09-22T07:31:14+00:00

The RXDES and TXDES registers bits in the ftgmac100 indicates EDO{R,T}R
at bit position 15 for the Faraday Tech IP. However, the version of this
IP present in the Aspeed SoCs has these bits at position 30 in the
registers.

It appers that ast2400 SoCs support both positions, with the 15th bit
marked as reserved but still functional. In the ast2500 this bit is
reused for another function, so we need a work around.

This was confirmed with engineers from Aspeed that using bit 30 is
correct for both the ast2400 and ast2500 SoCs.

Signed-off-by: Joel Stanley 
Signed-off-by: David S. Miller

net/faraday: Make EDO{R,T}R bits configurable

2016-09-22T07:31:14+00:00

These bits are #defined at a fixed location. In order to support future
hardware that has chosen to move these bits around move the bits into a
member of the struct ftgmac100.

Signed-off-by: Andrew Jeffery 
Signed-off-by: Joel Stanley 
Signed-off-by: David S. Miller

net/faraday: Separate rx page storage from rxdesc

2016-09-22T07:31:14+00:00

The ftgmac100 hardware revision in e.g. the Aspeed AST2500 no longer
reserves all bits in RXDES#2 but instead uses the bottom 16 bits to
store MAC frame metadata. Avoid corruption by shifting struct page
pointers out to their own member in struct ftgmac100.

Signed-off-by: Andrew Jeffery 
Signed-off-by: Joel Stanley 
Signed-off-by: David S. Miller

net/faraday: Disallow using reversed MAC address from hardware

2016-07-21T04:05:18+00:00

The initial MAC address is retrieved from hardware if it's not
provided by device-tree. The reserved MAC address from hardware
will be used if non-reserved MAC address is invalid. It will
cause mismatched MAC address seen by hardware and software.

This disallows using the reserved hardware MAC address to avoid
the mismatched MAC address seen by hardware and software.

Fixes: 113ce107afe9 ("net/faraday: Read MAC address from chip")
Suggested-by: David Laight 
Suggested-by: Benjamin Herrenschmidt 
Signed-off-by: Gavin Shan 
Signed-off-by: David S. Miller

net/faraday: Mask PHY interrupt with NCSI mode

2016-07-20T03:49:18+00:00

Bogus PHY interrupts are observed. This masks the PHY interrupt
when the interface works in NCSI mode as there is no attached
PHY under the circumstance.

Signed-off-by: Gavin Shan 
Acked-by: Joel Stanley 
Signed-off-by: David S. Miller

net/faraday: Match driver according to compatible property

2016-07-20T03:49:18+00:00

This matches the driver with devices compatible with "faraday,ftgmac100"
declared in the device tree. Originally, device's name from device
tree for it.

Signed-off-by: Gavin Shan 
Acked-by: Joel Stanley 
Signed-off-by: David S. Miller