RMII on IMX6Q

christophe · ‎09-20-2013

Hi all,

I've connected a lan8720 with imx6q, following doc recommandations. Component seems to correctly respond but there's no way to ping .

I've read in posts that imx6 kernel doesn't support rmii no longer, and that a patch is necessary. Is it the case ? I join schematics and config.

MX6Q_PAD_ENET_MDIO__ENET_MDIO,

MX6Q_PAD_ENET_MDC__ENET_MDC,

MX6Q_PAD_ENET_TX_EN__ENET_TX_EN,

MX6Q_PAD_ENET_CRS_DV__ENET_RX_EN,

MX6Q_PAD_ENET_RXD0__ENET_RDATA_0,

MX6Q_PAD_ENET_RXD1__ENET_RDATA_1,

MX6Q_PAD_ENET_TXD0__ENET_TDATA_0,

MX6Q_PAD_ENET_TXD1__ENET_TDATA_1,

MX6Q_PAD_ENET_RX_ER__ENET_RX_ER,

MX6Q_PAD_RGMII_TX_CTL__ENET_ANATOP_ETHERNET_REF_OUT, /* Clock ref input */

MX6Q_PAD_EIM_D17__GPIO_3_17, /* Reset RMII */

MX6Q_PAD_EIM_D16__GPIO_3_16, /* Int RMII */

I use an external 50 MHz ref clock. Init in the kernel is like below:

- reset MX6Q_PAD_EIM_D17__GPIO_3_1

- Bit 21 to 0: mxc_iomux_set_gpr_register(1, 21, 1, 0);

- imx6_init_fec(fec_data);

static struct fec_platform_data fec_data __initdata =

{

.init = mx6q_sabresd_fec_phy_init,

.phy = PHY_INTERFACE_MODE_RMII,

};

In uboot:

/*

* get enet tx reference clk from internal clock from anatop

* GPR1[21] = 1

*/

reg = readl(IOMUXC_BASE_ADDR + 0x4);

// reg |= (0x1 << 21);

reg |= (0x0 << 21); /* External clock chosen */

writel(reg, IOMUXC_BASE_ADDR + 0x4);

And the modif in fec_init()

#if defined(CONFIG_MX6Q) || defined(CONFIG_MX6DL)

/* RGMII */

// fecp->rcr &= ~(0x100);

// fecp->rcr |= 0x44;

/* RMII */

fecp->rcr &= ~(0x40);

fecp->rcr |= 0x104;

#endif

And the log:

CPU: Freescale i.MX6 family TO1.2 at 792 MHz

Temperature: 40 C, calibration data 0x5b350a7d

mx6q pll1: 792MHz

mx6q pll2: 528MHz

mx6q pll3: 480MHz

mx6q pll8: 50MHz

ipg clock : 66000000Hz

ipg per clock : 66000000Hz

uart clock : 80000000Hz

cspi clock : 60000000Hz

ahb clock : 132000000Hz

axi clock : 264000000Hz

emi_slow clock: 132000000Hz

ddr clock : 528000000Hz

usdhc1 clock : 198000000Hz

usdhc2 clock : 198000000Hz

usdhc3 clock : 198000000Hz

usdhc4 clock : 198000000Hz

nfc clock : 24000000Hz

Board: i.MX6Q-SABRESD: unknown-board Board: 0x63012 [POR ]

Boot Device: SD

I2C: ready

DRAM: 1 GB

MMC: FSL_USDHC: 0,FSL_USDHC: 1

CLKCTL_CSCDR3 108410x

CLKCTL_CHSCCDR 2a9530x

In: serial

Out: serial

Err: serial

Found PFUZE100! deviceid=10,revid=11

Net: got MAC address from IIM: 00:00:00:00:00:00

FEC0 [PRIME]

Hit any key to stop autoboot: 0

mmc0 is current device

MMC read: dev # 0, block # 2048, count 8192 ... 8192 blocks read: OK

## Booting kernel from Legacy Image at 10800000 ...

Image Name: Linux-3.0.35-2310-gc27cb38

Image Type: ARM Linux Kernel Image (uncompressed)

Data Size: 3430328 Bytes = 3.3 MB

Load Address: 10008000

Entry Point: 10008000

Verifying Checksum ... OK

Loading Kernel Image ... OK

OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel.

Linux version 3.0.35-2310-gc27cb38 (lucid@ubuntu) (gcc version 4.6.2 20110630 (prerelease) (Freescale MAD -- Linaro 2011.07 -- Built at 2011/08/10 09:20) ) #156 SMP PREEMPT Fri Sep 20 08:40:07 CEST 2013

CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7), cr=10c53c7d

CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache

Machine: Freescale i.MX 6Quad/DualLite/Solo Sabre-SD Board

Ignoring unrecognised tag 0x54410008

Memory policy: ECC disabled, Data cache writealloc

CPU identified as i.MX6Q, silicon rev 1.2

PERCPU: Embedded 7 pages/cpu @8c008000 s5440 r8192 d15040 u32768

Built 1 zonelists in Zone order, mobility grouping on. Total pages: 227328

Kernel command line: console=ttymxc0,115200 video=mxcfb0:dev=lcd,720P60R1,if=RGB24 video=mxcfb1:dev=ldb,LDB-XGA,if=RGB666 video=mxcfb2:dev=lcd,720P60R1,if=RGB32 video=mxcfb3:off root=/dev/mmcblk0p1 rw rootwait

PID hash table entries: 4096 (order: 2, 16384 bytes)

Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)

Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)

Memory: 640MB 256MB = 896MB total

Memory: 901296k/901296k available, 147280k reserved, 0K highmem

Virtual kernel memory layout:

vector : 0xffff0000 - 0xffff1000 ( 4 kB)

fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)

DMA : 0xf4600000 - 0xffe00000 ( 184 MB)

vmalloc : 0xc0800000 - 0xf2000000 ( 792 MB)

lowmem : 0x80000000 - 0xc0000000 (1024 MB)

pkmap : 0x7fe00000 - 0x80000000 ( 2 MB)

modules : 0x7f000000 - 0x7fe00000 ( 14 MB)

.init : 0x80008000 - 0x80036000 ( 184 kB)

.text : 0x80036000 - 0x8065081c (6251 kB)

.data : 0x80652000 - 0x806ac300 ( 361 kB)

.bss : 0x806ac324 - 0x806f6d74 ( 299 kB)

SLUB: Genslabs=13, HWalign=32, Order=0-3, MinObjects=0, CPUs=2, Nodes=1

Preemptible hierarchical RCU implementation.

NR_IRQS:496

MXC GPIO hardware

sched_clock: 32 bits at 3000kHz, resolution 333ns, wraps every 1431655ms

arm_max_freq=1

MXC_Early serial console at MMIO 0x2020000 (options '115200')

bootconsole [ttymxc0] enabled

Console: colour dummy device 80x30

Calibrating delay loop... 1581.05 BogoMIPS (lpj=7905280)

pid_max: default: 32768 minimum: 301

Mount-cache hash table entries: 512

CPU: Testing write buffer coherency: ok

hw perfevents: enabled with ARMv7 Cortex-A9 PMU driver, 7 counters available

CPU1: Booted secondary processor

Brought up 2 CPUs

SMP: Total of 2 processors activated (3162.11 BogoMIPS).

print_constraints: dummy:

NET: Registered protocol family 16

print_constraints: vddpu: 725 <--> 1300 mV at 700 mV fast normal

print_constraints: vddcore: 725 <--> 1300 mV at 1150 mV fast normal

print_constraints: vddsoc: 725 <--> 1300 mV at 1200 mV fast normal

print_constraints: vdd2p5: 2000 <--> 2775 mV at 2400 mV fast normal

print_constraints: vdd1p1: 800 <--> 1400 mV at 1100 mV fast normal

print_constraints: vdd3p0: 2625 <--> 3400 mV at 3000 mV fast normal

hw-breakpoint: found 6 breakpoint and 1 watchpoint registers.

hw-breakpoint: 1 breakpoint(s) reserved for watchpoint single-step.

hw-breakpoint: maximum watchpoint size is 4 bytes.

L310 cache controller enabled

l2x0: 16 ways, CACHE_ID 0x410000c7, AUX_CTRL 0x02070000, Cache size: 1048576 B

bio: create slab <bio-0> at 0

mxs-dma mxs-dma-apbh: initialized

print_constraints: vmmc: 3300 mV

SCSI subsystem initialized

spi_imx imx6q-ecspi.0: probed

spi_imx imx6q-ecspi.1: probed

usbcore: registered new interface driver usbfs

usbcore: registered new interface driver hub

usbcore: registered new device driver usb

Freescale USB OTG Driver loaded, $Revision: 1.55 $

i2c i2c-1: Failed to register i2c client pfuze100 at 0x08 (-16)

i2c i2c-1: Can't create device at 0x08

i2c i2c-2: Invalid 7-bit I2C address 0x00

i2c i2c-2: Can't create device at 0x00

imx-ipuv3 imx-ipuv3.0: IPU DMFC NORMAL mode: 1(0~1), 5B(4,5), 5F(6,7)

imx-ipuv3 imx-ipuv3.1: IPU DMFC NORMAL mode: 1(0~1), 5B(4,5), 5F(6,7)

mxc_mipi_csi2 mxc_mipi_csi2: i.MX MIPI CSI2 driver probed

mxc_mipi_csi2 mxc_mipi_csi2: i.MX MIPI CSI2 dphy version is 0x3130302a

MIPI CSI2 driver module loaded

Advanced Linux Sound Architecture Driver Version 1.0.24.

i2c-core: driver [max17135] using legacy suspend method

i2c-core: driver [max17135] using legacy resume method

Switching to clocksource mxc_timer1

NET: Registered protocol family 2

IP route cache hash table entries: 32768 (order: 5, 131072 bytes)

TCP established hash table entries: 131072 (order: 8, 1048576 bytes)

TCP bind hash table entries: 65536 (order: 7, 786432 bytes)

TCP: Hash tables configured (established 131072 bind 65536)

TCP reno registered

UDP hash table entries: 512 (order: 2, 16384 bytes)

UDP-Lite hash table entries: 512 (order: 2, 16384 bytes)

NET: Registered protocol family 1

RPC: Registered named UNIX socket transport module.

RPC: Registered udp transport module.

RPC: Registered tcp transport module.

RPC: Registered tcp NFSv4.1 backchannel transport module.

PMU: registered new PMU device of type 0

Static Power Management for Freescale i.MX6

wait mode is enabled for i.MX6

cpaddr = c0880000 suspend_iram_base=c08fc000

PM driver module loaded

IMX usb wakeup probe

add wake up source irq 75

IMX usb wakeup probe

cpu regulator init ldo=0

i.MXC CPU frequency driver

msgmni has been set to 1760

alg: No test for stdrng (krng)

io scheduler noop registered

io scheduler deadline registered

io scheduler cfq registered (default)

mxc_mipi_dsi mxc_mipi_dsi: i.MX MIPI DSI driver probed

MIPI DSI driver module loaded

mxc_sdc_fb mxc_sdc_fb.0: register mxc display driver lcd

Register driver LCD MODE IPU0 DI0 : 720P60R1

Console: switching to colour frame buffer device 90x80

mxc_sdc_fb mxc_sdc_fb.1: register mxc display driver ldb

_regulator_get: get() with no identifier

mxc_sdc_fb mxc_sdc_fb.2: register mxc display driver lcd

Register driver LCD MODE IPU0 DI0 : 720P60R1

mxc_sdc_fb mxc_sdc_fb.2: ipu0-di0 already in use

mxc_sdc_fb: probe of mxc_sdc_fb.2 failed with error -16

mxc_sdc_fb mxc_sdc_fb.3: Can't get fb option for mxcfb3!

imx-sdma imx-sdma: loaded firmware 1.1

imx-sdma imx-sdma: initialized

Serial: IMX driver

imx-uart.0: ttymxc0 at MMIO 0x2020000 (irq = 58) is a IMX

console [ttymxc0] enabled, bootconsole disabled

loop: module loaded

GPMI NAND driver registered. (IMX)

FEC Ethernet Driver

fec_enet_mii_bus: probed

ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver

fsl-ehci fsl-ehci.0: Freescale On-Chip EHCI Host Controller

fsl-ehci fsl-ehci.0: new USB bus registered, assigned bus number 1

fsl-ehci fsl-ehci.0: irq 75, io base 0x02184000

fsl-ehci fsl-ehci.0: USB 2.0 started, EHCI 1.00

hub 1-0:1.0: USB hub found

hub 1-0:1.0: 1 port detected

add wake up source irq 72

fsl-ehci fsl-ehci.1: Freescale On-Chip EHCI Host Controller

fsl-ehci fsl-ehci.1: new USB bus registered, assigned bus number 2

fsl-ehci fsl-ehci.1: irq 72, io base 0x02184200

fsl-ehci fsl-ehci.1: USB 2.0 started, EHCI 1.00

hub 2-0:1.0: USB hub found

hub 2-0:1.0: 1 port detected

Initializing USB Mass Storage driver...

usbcore: registered new interface driver usb-storage

USB Mass Storage support registered.

ARC USBOTG Device Controller driver (1 August 2005)

egalax_ts 1-0004: egalax_ts: failed to read firmware version

egalax_ts: probe of 1-0004 failed with error -5

egalax_ts 2-0004: egalax_ts: failed to read firmware version

egalax_ts: probe of 2-0004 failed with error -5

snvs_rtc snvs_rtc.0: rtc core: registered snvs_rtc as rtc0

i2c /dev entries driver

Linux video capture interface: v2.00

mxc_v4l2_output mxc_v4l2_output.0: V4L2 device registered as video16

mxc_v4l2_output mxc_v4l2_output.0: V4L2 device registered as video17

mxc_v4l2_output mxc_v4l2_output.0: V4L2 device registered as video18

imx2-wdt imx2-wdt.0: IMX2+ Watchdog Timer enabled. timeout=60s (nowayout=1)

sdhci: Secure Digital Host Controller Interface driver

sdhci: Copyright(c) Pierre Ossman

sdhci sdhci-esdhc-imx.0: no write-protect pin available!

sdhci sdhci-esdhc-imx.0: no card-detect pin available!

mmc0: no vmmc regulator found

mmc0: SDHCI controller on platform [sdhci-esdhc-imx.0] using DMA

mmc1: SDHCI controller on platform [sdhci-esdhc-imx.1] using DMA

mxc_vdoa mxc_vdoa: i.MX Video Data Order Adapter(VDOA) driver probed

VPU initialized

mxc_asrc registered

Thermal calibration data is 0x5b350a7d

Anatop Thermal registered as thermal_zone0

anatop_thermal_probe: default cooling device is cpufreq!

usbcore: registered new interface driver usbhid

usbhid: USB HID core driver

usbcore: registered new interface driver snd-usb-audio

Cirrus Logic CS42888 ALSA SoC Codec Driver

i2c-core: driver [cs42888] using legacy suspend method

i2c-core: driver [cs42888] using legacy resume method

imx_3stack asoc driver

ALSA device list:

No soundcards found.

NET: Registered protocol family 26

TCP cubic registered

NET: Registered protocol family 17

lib80211: common routines for IEEE802.11 drivers

VFP support v0.3: implementor 41 architecture 3 part 30 variant 9 rev 4

Bus freq driver module loaded

Bus freq driver Enabled

mxc_dvfs_core_probe

DVFS driver module loaded

snvs_rtc snvs_rtc.0: setting system clock to 1970-01-01 00:00:00 UTC (0)

Waiting for root device /dev/mmcblk0p1...

mmc0: host does not support reading read-only switch. assuming write-enable.

mmc0: new high speed SDHC card at address e624

mmcblk0: mmc0:e624 SU04G 3.69 GiB

mmcblk0: p1

EXT3-fs: barriers not enabled

EXT3-fs (mmcblk0p1): warning: maximal mount count reached, running e2fsck is recommended

kjournald starting. Commit interval 5 seconds

EXT3-fs (mmcblk0p1): using internal journal

EXT3-fs (mmcblk0p1): recovery complete

EXT3-fs (mmcblk0p1): mounted filesystem with writeback data mode

VFS: Mounted root (ext3 filesystem) on device 179:1.

Freeing init memory: 184K

starting pid 1242, tty '': '/etc/rc.d/rcS'

Mounting /proc and /sys

Starting the hotplug events dispatcher udevd

udevd (1251): /proc/1251/oom_adj is deprecated, please use /proc/1251/oom_score_adj instead.

Synthesizing initial hotplug events

Mounting filesystems

mount: mounting usbfs on /proc/bus/usb failed: No such file or directory

Changing password for root

New password:

Bad password: too short

Retype password:

passwd: can't create '/etc/shadow+': File exists

passwd: can't update password file /etc/shadow

eth0: Freescale FEC PHY driver [Generic PHY] (mii_bus:phy_addr=1:00, irq=-1)

PHY: 1:00 - Link is Up - 100/Full

root@ /$ ifconfig -a

eth0 Link encap:Ethernet HWaddr 1E:ED:19:27:1A:B3

inet addr:192.168.1.115 Bcast:192.168.1.255 Mask:255.255.255.0

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:0 errors:0 dropped:0 overruns:0 frame:0

TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

lo Link encap:Local Loopback

LOOPBACK MTU:16436 Metric:1

RX packets:0 errors:0 dropped:0 overruns:0 frame:0

TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

Thank for your help,

Christophe

christophe · ‎09-23-2013

Hi Weidong,

A good idea but it doesn't solved the issue.

rgds,

Christophe

View solution in original post

PraveenM · ‎01-11-2015

Also on RMII mode why do we need the ENET_REF_CLK Pad (V22) to be connected with External Clock source?

Thanks,

christophe · ‎01-16-2015

Hi,

1- You can use GPIO16 instead of MX6Q_PAD_RGMII_TX_CTL. I don't do like that because gpio16 is busy with something else in my board.

2- You can use an external oscillator or not. The external oscillator choice is more precise and safe. It seems to me imx had problems with that in the past.

3- I no longer use interrupt signal (not muxed now).

Christophe

PraveenM · ‎01-16-2015

Thanks for the response.

Our hardware is based on imx6Solo + RMII, the RGMII_TX_CTL is used for something else and we have a Driver code for imx6Q + RGMII.

I have modified the Driver code of imx6Q + RGMII to work for imx6Solo + RMII. For some reason I see the transmit is not working at all.

sinanakman · ‎01-16-2015

Hi Paveen

Are you able to put your PHY in loopback mode to see if

the issue is at FEC level or something to do with your PHY.

Regards

Sinan Akman

PraveenM · ‎01-16-2015

The MAC is able to communicate with the PHY chip on MDC and MDIO lines. Also the PHY link up / down interrupts are triggered without issues.

So I did not try the loopback on the PHY. I have to try the loopback on the MAC side.

These are my settings for GPIO16 (R2) <--- 50MHz EXT Clock --> TLK105L PHY:

GPR[21] = 0 //Disable internal clock

CCM_CCGR1[10] = 0x3 //Enable ENET Clk

GPIO16 SION = 1 //Receive the clock from external osc

GPIO16 Mode = 2 //Use this as CLK_REF for RMII

Thanks,

sinanakman · ‎01-16-2015

Hi Paveen

So, with a scope do you see data on mdio, correct clock on mdc and the generated external

clock is clean ? I'd suggest to check if any of these is missing.

Regards

Sinan Akman

PraveenM · ‎01-16-2015

Yes, I have validated those. I will cross check those again.

On the other note, the uboot code has transmit buffer size as 2 and Receive buffer as 64. Also the uboot code has tx buffer flush instructions before sending. I do not have all those in my driver code (which works okay for imx6Quad + RGMII) and my Tx buffer / Rx buffer are set to 64. Not sure whether the code difference we have in uboot are related to some imx6solo race condition issue. I am trying to get these extra uboot patch code on my driver to see if that resolves the problem.

Is the behavior of imx6Solo Ethernet differs from imx6Quad?

sinanakman · ‎01-16-2015

Hi Praveen

No the behaviour should be same, except of course solo/dual lite

has different reg map than quad.

You seemed to be porting part of uboot. Can't you just

use the latest uboot from the mainline and have that run

on your board. BTW, where do you see uboot xmit buffer

size is set to 2. Can you provide, file name, line number.

Regards

Sinan Akman

PraveenM · ‎01-16-2015

We are using the Nucleus Driver code and working on debug mode using probe.

I am going to work on customizing the uboot if this Nucleus Driver does not work.

Regarding the size, I am using Nitrogen6lite evb board uboot code as reference.

Refer to

File: fec_mux.h

Function: static int fec_alloc_descs(struct fec_priv *fec)

sinanakman · ‎01-16-2015

Hi Praveen

I don't know what Nitrogen evb included uboot is but I took a

look at the mainline uboot code as it seems it is not the buffers

but the number of tx descriptors is set to 2 (It actually

uses one descriptor but having 2 desc apparently prevents

a race condition). And it looks like you do need to flash for

dma to work properly. So please add the flash code and

perhaps also use only 2 (effectively 1) tx descriptors.

I suggest refer to mainline uboot code rather than the

version you are using.

Hope this helps

Regards

Sinan Akman

PraveenM · ‎01-16-2015

Sinan,

Yes, it is the number of TX desc, we have that as 64 in our code and we dont have the data flush.

I will cross check with mainline uboot also.

Thanks.

PraveenM · ‎01-11-2015

Hello Christophe,

We have a problem in using imx6Solo and TLK105L PHY chip on RMII mode. The transmit interrupt never triggered. I have configured the GPR, SION and IOMUX correctly.

Our schematics looks like yours with the following changes:

GPIO16 <---- External Clock ----->PHY

RGMII_TX_CTL is used for other peripheral and not connected to clock as you have mentioned.

any inputs would be a great help.

Thanks.

christophe · ‎09-23-2013

Weidong,

I've just finished to add Fugan Duan's modifs for rmii into the kenel, and it solved the issue.

Nevertheless, thanks for your help.

Rgds,

Christophe.

mikeredd · ‎12-10-2013

Where can I find "Fugan Duan's modifs".

Thanks.

-Mike

christophe · ‎09-23-2013

Hi Weidong,

A good idea but it doesn't solved the issue.

rgds,

Christophe

weidong_sun · ‎09-21-2013

Hello,Chrisophe,

I didn't find issue from BSP setting, But It seems that there is a little issue in schematic. Please pull up MDIO pin to VDDIO via a 1.5K-resistor. Then try it again.

regards,

Weidong

RMII on IMX6Q

RMII on IMX6Q

i.MX6Quad

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