u-boot: add 10Gbps retimer configurations

ClearFog CX boards rev 1.3 and newer contains on carrier board retimers
to support 100Gbps DAC cables.
When configuring the SERDEses to 10Gbps the retimer configuration needs
to be changed to lock on 10.3125Gbps rate on both the ingress (i2c
address 0x23) and egress (i2c address 0x22) retimers.
Signed-off-by: Rabeeh Khoury <rabeeh@solid-run.com>

patches/u-boot-LSDK-20.04/0029-lx2160acex7-add-10Gbps-retimer-configuration.patch

+From abc79c9532750adfc37f3869bf0c17a2e665df41 Mon Sep 17 00:00:00 2001
+From: Rabeeh Khoury <rabeeh@solid-run.com>
+Date: Wed, 30 Dec 2020 19:52:00 +0200
+Subject: [PATCH 29/29] lx2160acex7: add 10Gbps retimer configuration
+
+Signed-off-by: Rabeeh Khoury <rabeeh@solid-run.com>
+---
+ board/solidrun/lx2160a/eth_lx2160acex7.c | 47 ++++++++++++++++++++++--
+ 1 file changed, 44 insertions(+), 3 deletions(-)
+
+diff --git a/board/solidrun/lx2160a/eth_lx2160acex7.c b/board/solidrun/lx2160a/eth_lx2160acex7.c
+index f286f72e..a754d3fd 100644
+--- a/board/solidrun/lx2160a/eth_lx2160acex7.c
++++ b/board/solidrun/lx2160a/eth_lx2160acex7.c
+@@ -53,7 +53,11 @@ void setup_retimer_25g(int chnum)
+ 		printf ("ERROR : DS250DF410 retimer not found\n");
+ 		return;
+ 	}
+-	printf ("Found retimer... Setting up channels 0..%d as 25Gbps\n",chnum - 1);
++	if (chnum > 0)
++		printf ("Setting up retimer channels 1..%d as 25Gbps\n",chnum);
++	if (chnum < 4)
++		printf ("Setting up retimer channels %d..4 as 10Gbps\n",chnum+1);
++
+ 	dm_i2c_reg_write(dev, 0xff, 0x1); /* Enable channel specific access */
+ 	/*
+ 	 * Setup 25Gbps channel on 0..chnum.
+@@ -71,8 +75,42 @@ void setup_retimer_25g(int chnum)
+ 		dm_i2c_reg_write(dev, 0x3f, 0x44);
+ 		dm_i2c_reg_write(dev, 0x0a, 0x00); /* Release CDR */
+ 	}
+-
+-	/* TODO: Setup other channels as 10Gbps */
++	if (chnum < 4) {
++		/* Setup the rest of the channels as 10g */
++		for (i = chnum ; i < 4; i++) {
++			dm_i2c_reg_write(dev, 0xfc, 1 << i);
++			dm_i2c_reg_write(dev, 0x00, 0x4); /* Reset channel registers */
++			dm_i2c_reg_write(dev, 0x0a, 0xc); /* Assert CDR reset */
++			dm_i2c_reg_write(dev, 0x3d, 0x8f); /* Enable pre/post and set main cursor to 0xf */
++			dm_i2c_reg_write(dev, 0x3e, 0x44); /* Set pre-cursor to -4 */
++			/* Set post-cursor of channel #0 to -4 */
++			dm_i2c_reg_write(dev, 0x3f, 0x44);
++			dm_i2c_reg_write(dev, 0x2f, 0x04); /* Set rate to 10.3125 Gbps */
++			dm_i2c_reg_write(dev, 0x0a, 0x00); /* Release CDR */
++		}
++		ret = i2c_get_chip_for_busnum(0, 0x22, 1, &dev);
++		if (ret) {
++			printf ("ERROR: Retimer at address 0x22 not found\n");
++			return;
++		}
++		ret = dm_i2c_read(dev, 0xf1, &reg, 1); /* Get full device ID */
++		if (ret) {
++			printf ("ERROR: Could not get retimer device ID\n");
++			return;
++		}
++		if (reg != 0x10) {
++			printf ("ERROR : DS250DF410 retimer not found\n");
++			return;
++		}
++		dm_i2c_reg_write(dev, 0xff, 0x1); /* Enable channel specific access */
++		for (i = chnum ; i < 4; i++) {
++			dm_i2c_reg_write(dev, 0xfc, 1 << i);
++			dm_i2c_reg_write(dev, 0x00, 0x4); /* Reset channel registers */
++			dm_i2c_reg_write(dev, 0x0a, 0xc); /* Assert CDR reset */
++			dm_i2c_reg_write(dev, 0x2f, 0x04); /* Set rate to 10.3125 Gbps */
++			dm_i2c_reg_write(dev, 0x0a, 0x00); /* Release CDR */
++		}
++	}
+ }
+ 
+ int board_eth_init(bd_t *bis)
+@@ -100,6 +138,9 @@ int board_eth_init(bd_t *bis)
+ 			      RGMII_PHY_ADDR1);
+ 	reg = (struct memac_mdio_controller *)CONFIG_SYS_FSL_WRIOP1_MDIO2;
+ 	switch (srds_s1) {
++		case 8:
++			setup_retimer_25g(0);
++			break;
+ 		case 13:
+ 		case 14:
+ 		case 15:
+-- 
+2.25.1
+