topic Re: SJA1105 configuration in i.MX Processors

SJA1105 configuration

amol_kulkarni1 — Wed, 27 Jul 2022 20:04:28 GMT

I have attached our hardware design of how iMX8 is connected to SJA1105 and then to KSZ8873 and TJA1101.

1. CPU port from iMX8 to SJA is connected on port0

2. KSZ8873 which is MAC+PHY that is it also behaves like switch connected to port4

2. TJA1101 BroadR phy connected to port2

Issue

Unable to ping the device

I think I got the SJA1105 driver up it is verifying the device ID.

KSZ and TJA device ID's are also successfully verified

below is my dts configuration

SJA1105 Configuration

&ecspi1 {
fsl,spi-num-chipselects = <1>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_ecspi1 &pinctrl_ecspi1_cs>;
cs-gpios = <&gpio5 9 GPIO_ACTIVE_LOW>; /* Check this pin if required as we are using SS0 for chip select */
status = "okay";
##address-cells = <1>
#size-cells = <0>;

switch: sja1105@1 {
reg = <0x0>;
#address-cells = <1>;
#size-cells = <0>;
compatible = "nxp,sja1105q";
spi-max-frequency = <4000000>;
spi-cpha;
fsl,spi-cs-sck-delay = <1000>;
fsl,spi-sck-cs-delay = <1000>;
ports {
#address-cells = <1>;
#size-cells = <0>;
port@0 {
label = "swp0";
ethernet = <&fec>;
phy-mode = "rmii";
reg = <0>;
fixed-link {
speed = <100>;
full-duplex;
};
};
port@1 {
label = "swp1";
fixed-link = <0 1 100 0 0>;
phy-mode = "mii";
reg = <1>;
};
port@2 {
label = "swp2";
phy-handle = <&fec_phy1>;
phy-mode = "mii";
reg = <2>;
};
port@3 {
label = "swp3";
fixed-link = <0 1 100 0 0>;
phy-mode = "mii";
reg = <3>;
};
port@4 {
label = "swp4";
//phy-handle = <&fec_phy2>;
phy-mode = "mii";
reg = <4>;
fixed-link {
speed = <100>;
full-duplex;
};
};
};
};
};

FEC Configuration

&fec {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_fec>;
phy-mode = "rmii";
phy-reset-gpios = <&gpio3 19 GPIO_ACTIVE_LOW>;
phy-reset-post-delay = <100>;
fsl,magic-packet;
status = "okay";

fixed-link {
speed = <100>;
full-duplex;
};

mdio {
compatible = "snps,dwmac-mdio";
#address-cells = <1>;
#size-cells = <0>;

fec_phy1: fec-phy@0 {
compatible = "ethernet-phy-ieee802.3-c22";
reg = <0>;
eee-broken-1000t;
tja110x,refclk_in;
};
};

};

Issue

Unable to ping the device

I think I got the SJA1105 driver up it is verifying the device ID.

KSZ and TJA device ID's are also successfully verified

ip link output
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000
link/ether d2:38:41:00:11:65 brd ff:ff:ff:ff:ff:ff
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000
link/ether 1e:29:0c:9a:d7:58 brd ff:ff:ff:ff:ff:ff
4: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UP mode DEFAULT group default qlen 10
link/can
5: can1: <NOARP,ECHO> mtu 16 qdisc noop state DOWN mode DEFAULT group default qlen 10
link/can
6: swp1@eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
link/ether d2:38:41:00:11:65 brd ff:ff:ff:ff:ff:ff
7: swp2@eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
link/ether d2:38:41:00:11:65 brd ff:ff:ff:ff:ff:ff
8: swp3@eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
link/ether d2:38:41:00:11:65 brd ff:ff:ff:ff:ff:ff
9: swp4@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
link/ether d2:38:41:00:11:65 brd ff:ff:ff:ff:ff:ff

ip route output

192.168.0.0/24 dev eth1 proto kernel scope link src 192.168.0.30
192.168.0.0/24 dev swp4 proto kernel scope link src 192.168.0.20

I dont know what am i missing but unable to ping our HW.

Re: SJA1105 configuration

riteshmpatel — Tue, 09 Aug 2022 11:45:39 GMT

H @amol_kulkarni1,

Hope you are doing well.

Apologies for delay in response.

Could you please try doing loopback and share the logs?

Thanks & Regards,

Ritesh M Patel

Re: SJA1105 configuration

amol_kulkarni1 — Tue, 23 Aug 2022 02:33:37 GMT

I have made some more changes as below.

We have RMII interface between iMX8 and SJA1105.
We don't have the oscillator connected to ref clock so we have to generate the ref clock.
Found that SJA1105 in PHY can't provide the clock to imx8.
so now generated the clock of 50 MHZ from imx8 SJA1105.

After making these changes now I see ARP packets are going to connected device in my case I have connected PC at KSZ8873.

I check in Wireshark and found the ARP packets are reaching PC and PC is responding back with MAC address.

But looks like these packets are dropped below are ethtool outputs

root@imx8-ccomgx2-base:~# ethtool -S eth0 | grep -v ': 0'

NIC statistics:

mmc_tx_octetcount_gb: 2224

mmc_tx_framecount_gb: 26

mmc_tx_broadcastframe_g: 1

mmc_tx_multicastframe_g: 16

mmc_tx_64_octets_gb: 2

mmc_tx_65_to_127_octets_gb: 24

mmc_tx_unicast_gb: 9

mmc_tx_multicast_gb: 16

mmc_tx_broadcast_gb: 1

mmc_tx_octetcount_g: 2224

mmc_tx_framecount_g: 26

mmc_rx_framecount_gb: 4117

mmc_rx_octetcount_gb: 459131

mmc_rx_octetcount_g: 459131

mmc_rx_broadcastframe_g: 4086

mmc_rx_multicastframe_g: 21

mmc_rx_64_octets_gb: 3339

mmc_rx_65_to_127_octets_gb: 92

mmc_rx_128_to_255_octets_gb: 5

mmc_rx_256_to_511_octets_gb: 681

mmc_rx_unicast_g: 10

mmc_rx_ipc_intr_mask: 1073692671

mmc_rx_ipv4_gd: 777

mmc_rx_ipv4_gd_octets: 231359

mmc_rx_ipv6_gd_octets: 72

mmc_rx_ipv6_gd: 1

mmc_rx_udp_gd: 769

mmc_rx_icmp_gd: 9

mmc_rx_udp_gd_octets: 215307

mmc_rx_icmp_gd_octets: 544

threshold: 1

tx_pkt_n: 26

rx_pkt_n: 4117

normal_irq_n: 4100

rx_normal_irq_n: 4099

napi_poll: 8224

tx_normal_irq_n: 4100

tx_clean: 4125

tx_set_ic_bit: 1

ip_csum_bypassed: 3339

ipv4_pkt_rcvd: 777

ipv6_pkt_rcvd: 1

no_ptp_rx_msg_type_ext: 4117

root@imx8-ccomgx2-base:~# ethtool -S swp4 | grep -v ': 0'

NIC statistics:

tx_packets: 3301

tx_bytes: 139186

n_rxfrm: 2973

n_rxbyte: 312110

n_txfrm: 3904

n_txbyte: 420158

n_egr_disabled: 5

qlevel_hwm_0: 1

root@imx8-ccomgx2-base:~#

Questions

When I load the SJA1105 driver I see the following message, based on below message I understand that swp2 and swp4 are not initialized. Why am I getting this error?

[ 103.534901] sja1105 spi1.0 swp4 (uninitialized PHY [30be0000.ethernet-1:01] driver [Micrel KSZ8873MLL Switch]

[ 103.560539] sja1105 spi1.0 swp4 (uninitialized phy: setting supported 00,00000000,0000024a advertising 00,00000000,0000024a

[ 102.452530] sja1105 spi1.0 swp2 (uninitialized PHY [30be0000.ethernet-1:00] driver [NXP TJA1101]

[ 102.477021] sja1105 spi1.0 swp2 (uninitialized phy: setting supported 00,00000000,0000024a advertising 00,00000000,00000000

is the SJA1105 driver provided is compatible with imx8mp?
Do I need to worry about the VLAN id here?

How am I testing

ifconfig eth0 up (Not assigning the IP address, just making interface up )

ifconfig swp4 192.168.1.20 up (This port is were KSZ8873 phy is connected)

ping 192.168.1.103 (PC IP address)

Re: SJA1105 configuration

riteshmpatel — Fri, 02 Sep 2022 11:34:08 GMT

Hi Amol,

Hope you are doing well.

Apologies for delay in response.

Kindly delete the FEC node from FEC configurations and update the device tree as per below link:

https://www.kernel.org/doc/Documentation/devicetree/bindings/net/dsa/sja1105.txt

Thanks & Regards,

Ritesh M Patel