[PATCH 1/3] net: Add support for Broadcom GENETv5 Ethernet controller

[Stefan Wahren <stefan.wahren@i2se.com>]

Am 20.12.19 um 20:29 schrieb Stefan Wahren:
> Hi Andre,
>
> Am 18.12.19 um 12:59 schrieb Andre Przywara:
>> From: Amit Singh Tomar <amittomer25@gmail.com>
>>
>> The Broadcom GENET Ethernet MACs are used in several MIPS based SoCs
>> and in the Broadcom 2711/2838 SoC used on the Raspberry Pi 4.
>> There is no publicly available documentation, so this driver is based
>> on the Linux driver. Compared to that the queue management is
>> drastically simplified, also we only support version 5 of the IP and
>> RGMII connections between MAC and PHY, as used on the RPi4.
>>
>> Signed-off-by: Amit Singh Tomar <amittomer25@gmail.com>
>> Reviewed-by: Andre Przywara <andre.przywara@arm.com>
>> [Andre: heavy cleanup and a few fixes]
>> Signed-off-by: Andre Przywara <andre.przywara@arm.com>
>> ---
>>  drivers/net/Kconfig    |   7 +
>>  drivers/net/Makefile   |   1 +
>>  drivers/net/bcmgenet.c | 702 +++++++++++++++++++++++++++++++++++++++++
>>  3 files changed, 710 insertions(+)
>>  create mode 100644 drivers/net/bcmgenet.c
>>
> ...
>> +
>> +/* We only support RGMII (as used on the RPi4). */
>> +static int bcmgenet_interface_set(struct bcmgenet_eth_priv *priv)
>> +{
>> +	phy_interface_t phy_mode = priv->interface;
>> +
>> +	switch (phy_mode) {
>> +	case PHY_INTERFACE_MODE_RGMII:
>> +		writel(PORT_MODE_EXT_GPHY, priv->mac_reg + SYS_PORT_CTRL);
>> +		break;
> This doesn't match the current Linux upstream kernel / DTS. We consider
> the PHY mode in the downstream DTS as wrong. It should be
> PHY_INTERFACE_MODE_RGMII_RXID. So please add this to keep compatibility
> to the upstream devicetree.
>
> Please following this series [1] for more information.
>
> Thank you a lot for this work
>
> Stefan
>
> [1] - https://marc.info/?l=linux-netdev&m=157350191805462&w=2

Except of this, i noticed another issue with current u-boot. It
complains about misaligned access:

U-Boot 2020.01-rc5-00007-g5111518-dirty (Dec 23 2019 - 19:25:49 +0100)
 
DRAM:  948 MiB
RPI 4 Model B (0xc03112)
MMC:   sdhci at 7e300000: 0, emmc2 at 7e340000: 1
Loading Environment from FAT... Card did not respond to voltage select!
In:    serial
Out:   serial
Err:   serial
Net:   eth0: ethernet at 7d580000
Hit any key to stop autoboot:  0
Card did not respond to voltage select!
switch to partitions #0, OK
mmc1 is current device
Scanning mmc 1:1...
Found U-Boot script /boot.scr
213 bytes read in 73 ms (2 KiB/s)
## Executing script at 02400000
Card did not respond to voltage select!
Wrong Image Format for bootm command
ERROR: can't get kernel image!
SCRIPT FAILED: continuing...
30395 bytes read in 53 ms (559.6 KiB/s)
ethernet at 7d580000 Waiting for PHY auto negotiation to complete.. done
BOOTP broadcast 1
CACHE: Misaligned operation at range [3b3ed1c0, 3b3ed316]
CACHE: Misaligned operation at range [3b3ed1c0, 3b3ed316]
DHCP client bound to address 192.168.1.171 (15 ms)
*** Warning: no boot file name; using 'C0A801AB.img'
Using ethernet at 7d580000 device
TFTP from server 192.168.1.1; our IP address is 192.168.1.171
Filename 'C0A801AB.img'.
Load address: 0x200000
Loading: CACHE: Misaligned operation at range [3b3ec640, 3b3ec66a]