net: Add NIC controller driver for OcteonTX

Adds support for Network Interface controllers found on
OcteonTX SoC platforms.

Signed-off-by: Suneel Garapati <sgarapati@marvell.com>
Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Joe Hershberger <joe.hershberger@ni.com>

1 files changed, 124 insertions, 0 deletions

diff --git a/drivers/net/octeontx/xcv.c b/drivers/net/octeontx/xcv.c
new file mode 100644
index 00000000000..8dd558b1bf2
--- /dev/null
+++ b/drivers/net/octeontx/xcv.c
@@ -0,0 +1,124 @@
+// SPDX-License-Identifier:    GPL-2.0
+/*
+ * Copyright (C) 2018 Marvell International Ltd.
+ */
+
+#include <config.h>
+#include <dm.h>
+#include <errno.h>
+#include <fdt_support.h>
+#include <pci.h>
+#include <malloc.h>
+#include <miiphy.h>
+#include <misc.h>
+#include <net.h>
+#include <netdev.h>
+#include <asm/io.h>
+#include <linux/delay.h>
+#include <linux/libfdt.h>
+
+#include <asm/arch/csrs/csrs-xcv.h>
+
+#define XCVX_BASE		0x87E0DB000000ULL
+
+/* Initialize XCV block */
+void xcv_init_hw(void)
+{
+	union xcvx_reset reset;
+	union xcvx_dll_ctl xcv_dll_ctl;
+
+	/* Take the DLL out of reset */
+	reset.u = readq(XCVX_BASE + XCVX_RESET(0));
+	reset.s.dllrst = 0;
+	writeq(reset.u, XCVX_BASE + XCVX_RESET(0));
+
+	/* Take the clock tree out of reset */
+	reset.u = readq(XCVX_BASE + XCVX_RESET(0));
+	reset.s.clkrst = 0;
+	writeq(reset.u, XCVX_BASE + XCVX_RESET(0));
+
+	/* Once the 125MHz ref clock is stable, wait 10us for DLL to lock */
+	udelay(10);
+
+	/* Optionally, bypass the DLL setting */
+	xcv_dll_ctl.u = readq(XCVX_BASE + XCVX_DLL_CTL(0));
+	xcv_dll_ctl.s.clkrx_set = 0;
+	xcv_dll_ctl.s.clkrx_byp = 1;
+	xcv_dll_ctl.s.clktx_byp = 0;
+	writeq(xcv_dll_ctl.u, XCVX_BASE + XCVX_DLL_CTL(0));
+
+	/* Enable the compensation controller */
+	reset.u = readq(XCVX_BASE + XCVX_RESET(0));
+	reset.s.comp = 1;
+	writeq(reset.u, XCVX_BASE + XCVX_RESET(0));
+	reset.u = readq(XCVX_BASE + XCVX_RESET(0));
+
+	/* Wait for 1040 reference clock cycles for the compensation state
+	 * machine lock.
+	 */
+	udelay(100);
+
+	/* Enable the XCV block */
+	reset.u = readq(XCVX_BASE + XCVX_RESET(0));
+	reset.s.enable = 1;
+	writeq(reset.u, XCVX_BASE + XCVX_RESET(0));
+
+	/* set XCV(0)_RESET[CLKRST] to 1 */
+	reset.u = readq(XCVX_BASE + XCVX_RESET(0));
+	reset.s.clkrst = 1;
+	writeq(reset.u, XCVX_BASE + XCVX_RESET(0));
+}
+
+/*
+ * Configure XCV link based on the speed
+ * link_up   : Set to 1 when link is up otherwise 0
+ * link_speed: The speed of the link.
+ */
+void xcv_setup_link(bool link_up, int link_speed)
+{
+	union xcvx_ctl xcv_ctl;
+	union xcvx_reset reset;
+	union xcvx_batch_crd_ret xcv_crd_ret;
+	int speed = 2;
+
+	/* Check RGMII link */
+	if (link_speed == 100)
+		speed = 1;
+	else if (link_speed == 10)
+		speed = 0;
+
+	if (link_up) {
+		/* Set operating speed */
+		xcv_ctl.u = readq(XCVX_BASE + XCVX_CTL(0));
+		xcv_ctl.s.speed = speed;
+		writeq(xcv_ctl.u, XCVX_BASE + XCVX_CTL(0));
+
+		/* Datapaths come out of reset
+		 * - The datapath resets will disengage BGX from the
+		 *   RGMII interface
+		 * - XCV will continue to return TX credits for each tick
+		 *   that is sent on the TX data path
+		 */
+		reset.u = readq(XCVX_BASE + XCVX_RESET(0));
+		reset.s.tx_dat_rst_n = 1;
+		reset.s.rx_dat_rst_n = 1;
+		writeq(reset.u, XCVX_BASE + XCVX_RESET(0));
+
+		/* Enable packet flow */
+		reset.u = readq(XCVX_BASE + XCVX_RESET(0));
+		reset.s.tx_pkt_rst_n = 1;
+		reset.s.rx_pkt_rst_n = 1;
+		writeq(reset.u, XCVX_BASE + XCVX_RESET(0));
+
+		xcv_crd_ret.u = readq(XCVX_BASE + XCVX_BATCH_CRD_RET(0));
+		xcv_crd_ret.s.crd_ret = 1;
+		writeq(xcv_crd_ret.u, XCVX_BASE + XCVX_BATCH_CRD_RET(0));
+	} else {
+		/* Enable packet flow */
+		reset.u = readq(XCVX_BASE + XCVX_RESET(0));
+		reset.s.tx_pkt_rst_n = 0;
+		reset.s.rx_pkt_rst_n = 0;
+		writeq(reset.u, XCVX_BASE + XCVX_RESET(0));
+		reset.u = readq(XCVX_BASE + XCVX_RESET(0));
+	}
+}