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KSZ9031 phy support for the 3.2 kernel
Added by Timothy Entinger over 7 years ago
We are using a Critical Link BSP for the MitySOM using the AM335x and a baseboard that has the Micrel KSZ9031 ethernet phy on it. For a distro, we are using TI's old Arago distribution running the 3.2 kernel. Support for the phy was not available from Micrel for the 3.2 kernel and Critical Link provided us a branch of the kernel with the phy working.
We now have a need to limit the ethernet phy to 10/100 mbps, but have found that the standard linux tools (ethtool and mii-tool) are not able to set this mode. The tools do not work because the micrel.c file for the phy's does not have an entry for the KSZ9031. Rather the board file does the setup of the phy chip directly. We are not certain which driver (cspw maybe?) the kernel is associating with the phy after it boots.
In U-boot, we can succesfully put the phy into different modes using the mii command.
Here are some of the things we have tried.
1) Writing to the phy's internal registers after the kernel reset's the phy at start-up.
//Added this code to the am335x_ksz9031_phy_fixup function.
val = 0x0000;
val = 0x2000 | 0x0100; //Disable autonegotiation; Set speed to 100 full duplex
//write to the basic control register
if (phy_write(phydev, 0, val) < 0) {
pr_err("Error setting speed to 100mbps full duplex\n");
return 1;
}
Also tried this code instead
//Read contents of 1000 Base-t control register
val = phy_read(phydev, 9);
if (val < 0) {
pr_err("Error reading 1000 Base-t control reg \n");
return val;
}
val &= 0xFCFF; //Disable bits 8, 9; do not advertise 1000 on autonegotiation
if (phy_write(phydev, 9, val) < 0) {
pr_err("Error writing to 1000 Base-t control reg\n");
return 1;
}
2) Setting the preferred mode of the phy in U-boot and booting the kernel (with and without the reset enabled).
Extra comments:
Results of Ethtool
root@jcimity335x:~# ethtool eth0
Settings for eth0:
Current message level: 0x00000000 (0)
Link detected: yes
Here is a dump of the phy's internal registers on booting after it has been reset by the GPIO line with no modifcations other than to read and print the register contents at the end of am335x_ksz9031_phy_fixup. The phy works properly here, but will autonegotiate to 1000 mbps.
[ 5.726531] Register 0 contents: 0x1140 [ 5.730438] Register 1 contents: 0x796d [ 5.734619] Register 2 contents: 0x22 [ 5.738525] Register 3 contents: 0x1621 [ 5.742645] Register 4 contents: 0x1e1 [ 5.746673] Register 5 contents: 0xcde1 [ 5.750793] Register 6 contents: 0xf [ 5.754638] Register 7 contents: 0x2001 [ 5.758728] Register 8 contents: 0x444d [ 5.762847] Register 9 contents: 0x300 [ 5.766876] Register 10 contents: 0x3cff [ 5.771057] Register 11 contents: 0x0 [ 5.774963] Register 12 contents: 0x0 [ 5.778869] Register 13 contents: 0x0 [ 5.782775] Register 14 contents: 0x0 [ 5.786712] Register 15 contents: 0x3000 [ 5.790863] Register 16 contents: 0x0 [ 5.794769] Register 17 contents: 0xf4 [ 5.798828] Register 18 contents: 0x0 [ 5.802734] Register 19 contents: 0xb87e [ 5.806976] Register 20 contents: 0x44fe [ 5.811157] Register 21 contents: 0x0 [ 5.815063] Register 22 contents: 0x0 [ 5.818969] Register 23 contents: 0x200 [ 5.823059] Register 24 contents: 0x0 [ 5.826995] Register 25 contents: 0x0 [ 5.830902] Register 26 contents: 0x0 [ 5.834808] Register 27 contents: 0x2f [ 5.838836] Register 28 contents: 0x0 [ 5.842742] Register 29 contents: 0x0 [ 5.846679] Register 30 contents: 0x0 [ 5.850585] Register 31 contents: 0x349
Replies (6)
RE: KSZ9031 phy support for the 3.2 kernel - Added by Jonathan Cormier over 7 years ago
I recently worked on this a bit.
Here are some u-boot patches to disable gigabit in u-boot. This won't affect linux as you've noticed.
http://support.criticallink.com/gitweb/?p=u-boot-mityarm-335x.git;a=commit;h=ae1697ccf66a6d57347780600a94cd11bb7fd2f9
http://support.criticallink.com/gitweb/?p=u-boot-mityarm-335x.git;a=commit;h=d0fb2f3476faf112d79aacb779bdf49ee3fdf691
This is just an example of setting the "disable_giga" env field in the som.c file. You could always store it in the uEnv.txt file if booting from sd card or save it to nand using saveenv.
http://support.criticallink.com/gitweb/?p=u-boot-mityarm-335x.git;a=commit;h=8d62235e67f74c84940de71173194ebc67e5a2c6
I'll follow up with a post for the kernel.
RE: KSZ9031 phy support for the 3.2 kernel - Added by Jonathan Cormier over 7 years ago
Timothy Entinger wrote:
We are using a Critical Link BSP for the MitySOM using the AM335x and a baseboard that has the Micrel KSZ9031 ethernet phy on it. For a distro, we are using TI's old Arago distribution running the 3.2 kernel. Support for the phy was not available from Micrel for the 3.2 kernel and Critical Link provided us a branch of the kernel with the phy working.
We now have a need to limit the ethernet phy to 10/100 mbps, but have found that the standard linux tools (ethtool and mii-tool) are not able to set this mode. The tools do not work because the micrel.c file for the phy's does not have an entry for the KSZ9031. Rather the board file does the setup of the phy chip directly. We are not certain which driver (cspw maybe?) the kernel is associating with the phy after it boots.
In the 3.2 kernel, looking at drivers/net/phy/micrel.c. There does appear to be an entry for the KSZ9031 phy.
http://support.criticallink.com/gitweb/?p=linux-mityarm-335x.git;a=blob;f=drivers/net/phy/micrel.c;h=94c7d8fd0f5a82d878b0f28cf42709ca1bf5ead5;hb=HEAD#l415
And we enable the "CONFIG_MICREL_PHY=y" in our defconfig.
Note that the auto negotiation is configured in genphy_config_advert():
http://support.criticallink.com/gitweb/?p=linux-mityarm-335x.git;a=blob;f=drivers/net/phy/phy_device.c;h=56d91914b36c2d3ce7a4ffd4bc6330bc64de27ec;hb=HEAD#l573
Note on line 573 it masks advertising based on supported however on line 606 it won't configure the gigabit registers if gigabit isn't supported. So its important to only clear the phydev->advertising gigabit fields and not the phydev->supported gigabit fields.
In your phy fixup you should be able to do something similar to the u-boot patch to disable advertising.
+ phydev->advertising &= ~(SUPPORTED_1000baseT_Half | + SUPPORTED_1000baseT_Full);
If this doesn't work, I would add some print statements into the genphy_config_advert() and your fixup code to make sure your fixup is running and setting the field correctly.
RE: KSZ9031 phy support for the 3.2 kernel - Added by Jonathan Cormier over 7 years ago
Note to confirm the Micrel phy driver is getting loaded.
root@mitysom-335x ~ $ dmesg | grep -i phy [ 1.760589] davinci_mdio davinci_mdio.0: detected phy mask fffffffb [ 1.771453] davinci_mdio davinci_mdio.0: phy[2]: device 0:02, driver Micrel KSZ9031 Gigabit PHY [ 8.746978] PHY 0:00 not found [ 8.750213] net eth0: CPSW phy found : id is : 0x221622 [ 14.746246] PHY: 0:02 - Link is Up - 1000/Full
RE: KSZ9031 phy support for the 3.2 kernel - Added by Timothy Entinger over 7 years ago
I haven't tried you're suggestions yet. I will be able to this afternoon.
The kernel source we're using is much further back on the development tree, here's my dmesg output when I boot.
root@jcimity335x:~# dmesg | grep -i phy
[ 0.126525] PHY reset
[ 1.441070] UBI: physical eraseblock size: 262144 bytes (256 KiB)
[ 5.718750] davinci_mdio davinci_mdio.0: detected phy mask fffffffe
[ 5.856353] davinci_mdio davinci_mdio.0: phy0: device 0:00, driver unknown
[ 14.189697] CPSW phy found : id is : 0x221621
[ 14.204559] PHY 0:01 not found
[ 24.185089] PHY: 0:00 - Link is Up - 1000/Full
Is it possible that just updating the micrel.c file will be enough to get proper support from ethtool?
RE: KSZ9031 phy support for the 3.2 kernel - Added by Jonathan Cormier over 7 years ago
Looking at my JCI kernel branch it does show that it was before we added the micrel phy support. You mentioned we gave you a more updated version with micrel support?
Do you have the following commits in your kernel tree? If so then you just need to enable CONFIG_MICREL_PHY=y
2014-05-22 09:03 Cormier,Jonathan o [jcormier/micrel_test] phy/micrel: KSZ9031 disable Asym Pause support 2014-05-19 16:01 Cormier,Jonathan o ARM: MitySOM: config: Enabled micrel phy support 2013-09-19 19:40 Patrice Vilchez o phy/micrel: Add suspend/resume support to Micrel PHYs 2013-08-13 09:59 Dinh Nguyen o phy: micrel: Add definitions for common Micrel PHY registers 2013-08-21 01:46 Sean Cross o net/phy: micrel: Add OF configuration support for ksz9021 2013-08-06 17:29 Jingoo Han o net: phy: micrel: Staticize ksz8873mll_read_status() 2013-03-10 22:50 Hector Palacios o phy/micrel: move flag handling to function for common use 2013-03-10 22:50 Hector Palacios o phy/micrel: Add support for KSZ8031 2013-02-28 08:45 Vlastimil Kosar o net/phy: micrel: Disable asymmetric pause for KSZ9021 2013-01-23 14:05 David J. Choi o drivers/net/phy/micrel_phy: Add support for new PHYs 2012-11-21 05:38 Jean-Christophe P~ o net: add micrel KSZ8873MLL switch support 2012-09-23 16:58 Marek Vasut o phy/micrel: Add missing header to micrel_phy.h 2012-09-23 16:58 Marek Vasut o phy/micrel: Rename KS80xx to KSZ80xx 2012-09-23 16:58 Marek Vasut o phy/micrel: Implement support for KSZ8021 2012-07-04 05:44 Christian Hohnsta~ o phylib: Support registering a bunch of drivers 2012-06-17 22:52 Jason Wang o phy/micrel: change phy_id_mask for KSZ9021 and KS8001 2012-05-21 14:20 Nobuhiro Iwamatsu o phy/micrel: Fix ID of KSZ9021 2014-05-21 15:20 Cormier,Jonathan o omap2/devices: Set phy_id to NULL to set it to be autodiscovered
You should be able to merge in the changes from the following tag without getting a ton of the newer commits.
mitysom_AM335XPSP_04.06.00.07
List of commits between the JCI branch and the mitysom_AM335XPSP_04.06.00.07 tag. Most of these are micrel phy related.
2014-12-22 15:20 Cormier, Jonathan o [mitysom_AM335XPSP_04.06.00.07] ARM: MitySOM: Fix unused warnings 2014-12-19 17:50 Cormier, Jonathan o ARM: MitySOM: TIWI: Fix TIWI defconfig 2014-12-19 11:34 Cormier, Jonathan o ARM: MitySOM: TIWI: Add WARN for when kernel is misconfigured 2014-12-18 14:23 Cormier, Jonathan o [tiwi-v3.2] ARM: MitySOM: TIWI: Support for CL AM335X TIWI module 2014-12-17 17:04 Cormier, Jonathan o ARM: MitySOM: TIWI: Add BLE PN option 2014-12-17 16:53 Cormier, Jonathan o ARM: MitySOM: TIWI: Support for CL AM335X TIWI module - defconfig 2014-12-17 16:07 Cormier, Jonathan o ARM: MitySOM: TIWI: Support for CL AM335X TIWI module - Kconfig 2014-12-18 10:57 Cormier, Jonathan o ARM: MitySOM: Add/Fix __init and __initdata tags in devkit baseboard 2014-12-18 10:21 Cormier, Jonathan o ARM: MitySOM: Fix comment and style issue 2014-12-17 17:23 Cormier, Jonathan o ARM: MitySOM: Fix Section mismatches 2014-07-08 17:08 Cormier,Jonathan o ARM: MitySOM: Add support for 1GB nand 2014-06-13 14:58 Gregory Dias o mitysom335x: defconfig: Modified to add OTG support for the kernel on both USB ports. 2014-05-23 13:20 Cormier,Jonathan o omap2: irq: Enable INTC_PENDING_IRQ3 register check for AM335x 2014-05-22 09:03 Cormier,Jonathan o [jcormier/micrel_test] phy/micrel: KSZ9031 disable Asym Pause support 2014-05-19 16:01 Cormier,Jonathan o ARM: MitySOM: config: Enabled micrel phy support 2013-09-19 19:40 Patrice Vilchez o phy/micrel: Add suspend/resume support to Micrel PHYs 2013-08-13 09:59 Dinh Nguyen o phy: micrel: Add definitions for common Micrel PHY registers 2013-08-21 01:46 Sean Cross o net/phy: micrel: Add OF configuration support for ksz9021 2013-08-06 17:29 Jingoo Han o net: phy: micrel: Staticize ksz8873mll_read_status() 2013-03-10 22:50 Hector Palacios o phy/micrel: move flag handling to function for common use 2013-03-10 22:50 Hector Palacios o phy/micrel: Add support for KSZ8031 2013-02-28 08:45 Vlastimil Kosar o net/phy: micrel: Disable asymmetric pause for KSZ9021 2013-01-23 14:05 David J. Choi o drivers/net/phy/micrel_phy: Add support for new PHYs 2012-11-21 05:38 Jean-Christophe P~ o net: add micrel KSZ8873MLL switch support 2012-09-23 16:58 Marek Vasut o phy/micrel: Add missing header to micrel_phy.h 2012-09-23 16:58 Marek Vasut o phy/micrel: Rename KS80xx to KSZ80xx 2012-09-23 16:58 Marek Vasut o phy/micrel: Implement support for KSZ8021 2012-07-04 05:44 Christian Hohnsta~ o phylib: Support registering a bunch of drivers 2012-06-17 22:52 Jason Wang o phy/micrel: change phy_id_mask for KSZ9021 and KS8001 2012-05-21 14:20 Nobuhiro Iwamatsu o phy/micrel: Fix ID of KSZ9021 2014-05-21 15:20 Cormier,Jonathan o omap2/devices: Set phy_id to NULL to set it to be autodiscovered 2014-05-21 15:19 Cormier,Jonathan o net/phy: Add ability to select first phy detected 2014-05-16 10:02 Cormier,Jonathan o ARM: MitySOM: Changed MityARM to MitySOM in baseboard 2014-05-06 15:57 Gregory Dias o ARM: MitySOM: Changed a few places in the config file and board file to rebrand from MityARM to MitySOM. 2014-04-08 17:24 Cormier,Jonathan o ARM: MitySOM: config: Build ti tsc driver as module. Generates large amount of interrupts and normally there is no touchscreen attached. 2014-04-08 11:17 Cormier,Jonathan o ARM: MitySOM: config: Enable DEVTMPFS in config 2014-02-27 14:57 Cormier,Jonathan │ o [JCI] [jcormier/JCI] [wanda/JCI] am335x: Update partition scheme for JCI
RE: KSZ9031 phy support for the 3.2 kernel - Added by Timothy Entinger over 7 years ago
Hi Everyone,
Merging in the changes from the tag (mitysom_AM335XPSP_04.06.00.07) worked for us to limit the ethernet speeds for the phy.
I removed the phy fixup function that was being called.
To reduce the speeds I modified the phy config table for the 9031 and set it to basic features instead of gigabit.
.phy_id = PHY_ID_KSZ9031,
.phy_id_mask = 0x00fffff0,
.name = "Micrel KSZ9031 Reduced Gigabit PHY",
.features = (PHY_BASIC_FEATURES | SUPPORTED_Pause),
.flags = PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT,
.config_init = kszphy_config_init,
.config_aneg = genphy_config_aneg,
.read_status = genphy_read_status,
.ack_interrupt = kszphy_ack_interrupt,
.config_intr = ksz9021_config_intr,
.suspend = genphy_suspend,
.resume = genphy_resume,
.driver = { .owner = THIS_MODULE, },
Thank you for the quick responses and support.
