DCAN doesn't work on DRA7-evm(E1) version

zumeng chen

Intellectual 650 points

Hi experts,

I might do wrong instructions, so I describe how I did validation on the board:

1. connect directly J2 and J3 (H-H, L-L), and leave J1 no-POP

2. canconfig can0/1 bitrate 50000 ctrlmode triple-sampling on

3. ip link set can0/1 up

These process are OK, and we can see interrupts as well.

4. cansend can0 -i 0x10 0x11 0x22 0x33 0x44 0x55 0x66 0x77 0x88

5. candump can1

Nothing

The weird thing is the interrupt counter of can0 will always increase, even if I remove the connection between J2 and J3.

kernel version and commit id are the following:

3.8.13

commit 7c7bc6be666f87c9c9d4e2f47dfb52180cf01c8c
Merge: 71a6fd5 6b70f21
Author: Somnath Mukherjee <somnath@ti.com>
Date: Fri Jul 11 17:43:44 2014 +0530

over 9 years ago

0 zumeng chen over 9 years ago

Intellectual 650 points

The same process works well on am335x.

0 Yanko Todorov-XID over 9 years ago in reply to zumeng chen

TI__Mastermind 29520 points

Hello Zumeng,

I assume that DCAN driver support is not enabled in TI's SW releases for DRA7 devices.

Could you point which SW release runs on your DRA7 board? (GLSDK or 6AK.1.1)

I suggest you to apply some modifications in configuration of your kernel.

By means of menuconfig, please check CAN network settings:

Networking support  --->
    <M>   CAN bus subsystem support ---> 
        --- CAN bus subsystem support
        <M>   Raw CAN Protocol (raw access with CAN-ID filtering)
        <M>   Broadcast Manager CAN Protocol (with content filtering)
              CAN Device Drivers  --->
                  <M> Virtual Local CAN Interface (vcan)
                  <M> Platform CAN drivers with Netlink support
                  [*]   CAN bit-timing calculation   
                  <M> Microchip 251x series SPI CAN Controller


I suggest you to see and apply D_CAN driver, discussed in this thread - http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/t/181918.aspx 

I checked for d_can driver in 6AK.1.1 Android release for DRA7xx and I confirm that d_can driver is not available. 
For implementing d_can in your SW, use as reference following patches:
ti814x: can: d_can: Add platform data for ti814x device - http://arago-project.org/git/projects/?p=linux-omap3.git;a=commit;h=c09024d0abb6ebdb7b4fbb422a92e11741b0bebc
ti814x: can: d_can: DCAN config added to ti8148_evm_defconfig  - http://arago-project.org/git/projects/?p=linux-omap3.git;a=commit;h=96f6237871d9c5929724a21c85b8e8eabe034aa4
can: d_can: Add support for Bosch D_CAN controller - http://arago-project.org/git/projects/?p=linux-omap3.git;a=commit;h=c5ed71c6de64db6fdf09d07bcb47dcd7189f7bac 

I also will apply this sequence to enable D_CAN on my board.

Best regards,
Yanko

0 zumeng chen over 9 years ago in reply to Yanko Todorov-XID

Intellectual 650 points

Hi Yanko,

It's the latest glsdk-3.8.y, and I have already setup these stuffs, and got the device can0/1

and it seems the initialization and interrupt handler register is OK. Just can't send/receive

messages like am335x.

Cheers,

Zumeng

0 Shawn Yang over 9 years ago in reply to Yanko Todorov-XID

TI__Intellectual 1285 points

hi team:

I've checked thread and add the D_CAN stuff, but it still didn't work, I didn't see the /dev/can*

here is my kernel config 2146.config_can.txt

here is the log 6765.dcan_withoutstuff.txt

Any suggestions?

0 Yanko Todorov-XID over 9 years ago in reply to Shawn Yang

TI__Mastermind 29520 points

Shawn,

Please follow the sequence, described in DCAN driver guide.

http://processors.wiki.ti.com/index.php/AM335x_DCAN_Driver_Guide

Best regards,

Yanko

0 Shawn Yang over 9 years ago in reply to Yanko Todorov-XID

TI__Intellectual 1285 points

hi Yanko,

I've made all the necessary change I know. My problems is after boot up, there is no DCAN device node, it seems the driver didn't work.

719 CONFIG_CAN=y
720 CONFIG_CAN_RAW=y
721 CONFIG_CAN_BCM=y
722 # CONFIG_CAN_GW is not set
723
724 #
725 # CAN Device Drivers
726 #
727 CONFIG_CAN_VCAN=y
728 CONFIG_CAN_SLCAN=y
729 CONFIG_CAN_DEV=y
730 CONFIG_CAN_CALC_BITTIMING=y
731 # CONFIG_CAN_TI_HECC is not set
732 # CONFIG_CAN_MCP251X is not set
733 # CONFIG_CAN_GRCAN is not set
734 # CONFIG_CAN_SJA1000 is not set
735 CONFIG_CAN_D_CAN=y
736 CONFIG_CAN_D_CAN_PLATFORM=y
737 # CONFIG_CAN_CC770 is not set

0 Yanko Todorov-XID over 9 years ago in reply to Shawn Yang

TI__Mastermind 29520 points

Hello Shawn,

Did you enable DCAN modules in dra7.dtsi file.

dcan1: d_can@4ae3c000{
           compatible = "bosch,d_can";
           ti,hwmods = "dcan1";
           reg = <0x4ae3c000 0x2000
                   0x4a002558 0x4>;
           interrupts = <0 81 0x4>;
           clocks = <&sys_clkin1>;
           flags = <0x5>;
           status = "disabled";    - "okay"
       };

       dcan2: d_can@48480000 {
           compatible = "bosch,d_can";
           ti,hwmods = "dcan2";
           reg = <0x48480000 0x2000
                   0x4a002558 0x4>;
           interrupts = <0 82 0x4>;
           clocks = <&sys_clkin1>;
           flags = <0x6>;
           status = "disabled"; "okay"
       };

Best regards,

Yanko

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DCAN doesn't work on DRA7-evm(E1) version