mips: octeon: Add cvmx-helper-sgmii.c

Import cvmx-helper-sgmii.c from 2013 U-Boot. It will be used by the later
added drivers to support networking on the MIPS Octeon II / III
platforms.

Signed-off-by: Aaron Williams <awilliams@marvell.com>
Signed-off-by: Stefan Roese <sr@denx.de>

1 files changed, 781 insertions, 0 deletions

diff --git a/arch/mips/mach-octeon/cvmx-helper-sgmii.c b/arch/mips/mach-octeon/cvmx-helper-sgmii.c
new file mode 100644
index 00000000000..b789ad5d191
--- /dev/null
+++ b/arch/mips/mach-octeon/cvmx-helper-sgmii.c
@@ -0,0 +1,781 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018-2022 Marvell International Ltd.
+ *
+ * Functions for SGMII initialization, configuration,
+ * and monitoring.
+ */
+
+#include <time.h>
+#include <log.h>
+#include <linux/delay.h>
+
+#include <mach/cvmx-regs.h>
+#include <mach/cvmx-csr.h>
+#include <mach/cvmx-bootmem.h>
+#include <mach/octeon-model.h>
+#include <mach/cvmx-fuse.h>
+#include <mach/octeon-feature.h>
+#include <mach/cvmx-qlm.h>
+#include <mach/octeon_qlm.h>
+#include <mach/cvmx-pcie.h>
+#include <mach/cvmx-coremask.h>
+
+#include <mach/cvmx-agl-defs.h>
+#include <mach/cvmx-bgxx-defs.h>
+#include <mach/cvmx-ciu-defs.h>
+#include <mach/cvmx-gmxx-defs.h>
+#include <mach/cvmx-ipd-defs.h>
+#include <mach/cvmx-pcsx-defs.h>
+#include <mach/cvmx-pki-defs.h>
+#include <mach/cvmx-xcv-defs.h>
+
+#include <mach/cvmx-helper.h>
+#include <mach/cvmx-helper-board.h>
+#include <mach/cvmx-helper-cfg.h>
+
+/**
+ * @INTERNAL
+ * Perform initialization required only once for an SGMII port.
+ *
+ * @param interface to init
+ * @param index     Index of prot on the interface
+ *
+ * @return Zero on success, negative on failure
+ */
+static int __cvmx_helper_sgmii_hardware_init_one_time(int interface, int index)
+{
+	const u64 clock_mhz = 1200; /* todo: fixme */
+	union cvmx_pcsx_miscx_ctl_reg pcsx_miscx_ctl_reg;
+	union cvmx_pcsx_linkx_timer_count_reg pcsx_linkx_timer_count_reg;
+	union cvmx_gmxx_prtx_cfg gmxx_prtx_cfg;
+
+	if (!cvmx_helper_is_port_valid(interface, index))
+		return 0;
+
+	/* Disable GMX */
+	gmxx_prtx_cfg.u64 = csr_rd(CVMX_GMXX_PRTX_CFG(index, interface));
+	gmxx_prtx_cfg.s.en = 0;
+	csr_wr(CVMX_GMXX_PRTX_CFG(index, interface), gmxx_prtx_cfg.u64);
+
+	/*
+	 * Write PCS*_LINK*_TIMER_COUNT_REG[COUNT] with the
+	 * appropriate value. 1000BASE-X specifies a 10ms
+	 * interval. SGMII specifies a 1.6ms interval.
+	 */
+	pcsx_miscx_ctl_reg.u64 =
+		csr_rd(CVMX_PCSX_MISCX_CTL_REG(index, interface));
+	/* Adjust the MAC mode if requested by device tree */
+	pcsx_miscx_ctl_reg.s.mac_phy =
+		cvmx_helper_get_mac_phy_mode(interface, index);
+	pcsx_miscx_ctl_reg.s.mode =
+		cvmx_helper_get_1000x_mode(interface, index);
+	csr_wr(CVMX_PCSX_MISCX_CTL_REG(index, interface),
+	       pcsx_miscx_ctl_reg.u64);
+
+	pcsx_linkx_timer_count_reg.u64 =
+		csr_rd(CVMX_PCSX_LINKX_TIMER_COUNT_REG(index, interface));
+	if (pcsx_miscx_ctl_reg.s.mode)
+		/* 1000BASE-X */
+		pcsx_linkx_timer_count_reg.s.count =
+			(10000ull * clock_mhz) >> 10;
+	else
+		/* SGMII */
+		pcsx_linkx_timer_count_reg.s.count =
+			(1600ull * clock_mhz) >> 10;
+
+	csr_wr(CVMX_PCSX_LINKX_TIMER_COUNT_REG(index, interface),
+	       pcsx_linkx_timer_count_reg.u64);
+
+	/*
+	 * Write the advertisement register to be used as the
+	 * tx_Config_Reg<D15:D0> of the autonegotiation.  In
+	 * 1000BASE-X mode, tx_Config_Reg<D15:D0> is PCS*_AN*_ADV_REG.
+	 * In SGMII PHY mode, tx_Config_Reg<D15:D0> is
+	 * PCS*_SGM*_AN_ADV_REG.  In SGMII MAC mode,
+	 * tx_Config_Reg<D15:D0> is the fixed value 0x4001, so this
+	 * step can be skipped.
+	 */
+	if (pcsx_miscx_ctl_reg.s.mode) {
+		/* 1000BASE-X */
+		union cvmx_pcsx_anx_adv_reg pcsx_anx_adv_reg;
+
+		pcsx_anx_adv_reg.u64 =
+			csr_rd(CVMX_PCSX_ANX_ADV_REG(index, interface));
+		pcsx_anx_adv_reg.s.rem_flt = 0;
+		pcsx_anx_adv_reg.s.pause = 3;
+		pcsx_anx_adv_reg.s.hfd = 1;
+		pcsx_anx_adv_reg.s.fd = 1;
+		csr_wr(CVMX_PCSX_ANX_ADV_REG(index, interface),
+		       pcsx_anx_adv_reg.u64);
+	} else {
+		if (pcsx_miscx_ctl_reg.s.mac_phy) {
+			/* PHY Mode */
+			union cvmx_pcsx_sgmx_an_adv_reg pcsx_sgmx_an_adv_reg;
+
+			pcsx_sgmx_an_adv_reg.u64 = csr_rd(
+				CVMX_PCSX_SGMX_AN_ADV_REG(index, interface));
+			pcsx_sgmx_an_adv_reg.s.dup = 1;
+			pcsx_sgmx_an_adv_reg.s.speed = 2;
+			csr_wr(CVMX_PCSX_SGMX_AN_ADV_REG(index, interface),
+			       pcsx_sgmx_an_adv_reg.u64);
+		} else {
+			/* MAC Mode - Nothing to do */
+		}
+	}
+	return 0;
+}
+
+static int __cvmx_helper_need_g15618(void)
+{
+	if (OCTEON_IS_MODEL(OCTEON_CN63XX) ||
+	    OCTEON_IS_MODEL(OCTEON_CN66XX_PASS1_X) ||
+	    OCTEON_IS_MODEL(OCTEON_CN68XX))
+		return 1;
+	else
+		return 0;
+}
+
+/**
+ * @INTERNAL
+ * Initialize the SERTES link for the first time or after a loss
+ * of link.
+ *
+ * @param interface to init
+ * @param index     Index of prot on the interface
+ *
+ * @return Zero on success, negative on failure
+ */
+static int __cvmx_helper_sgmii_hardware_init_link(int interface, int index)
+{
+	union cvmx_pcsx_mrx_control_reg control_reg;
+	union cvmx_pcsx_miscx_ctl_reg pcsx_miscx_ctl_reg;
+	bool phy_mode;
+	bool an_disable; /** Disable autonegotiation */
+	bool mode_1000x; /** 1000Base-X mode */
+
+	if (!cvmx_helper_is_port_valid(interface, index))
+		return 0;
+
+	/*
+	 * Take PCS through a reset sequence.
+	 * PCS*_MR*_CONTROL_REG[PWR_DN] should be cleared to zero.
+	 * Write PCS*_MR*_CONTROL_REG[RESET]=1 (while not changing the
+	 * value of the other PCS*_MR*_CONTROL_REG bits).  Read
+	 * PCS*_MR*_CONTROL_REG[RESET] until it changes value to
+	 * zero.
+	 */
+	control_reg.u64 = csr_rd(CVMX_PCSX_MRX_CONTROL_REG(index, interface));
+
+	/*
+	 * Errata G-15618 requires disabling PCS soft reset in CN63XX
+	 * pass upto 2.1.
+	 */
+	if (!__cvmx_helper_need_g15618()) {
+		control_reg.s.reset = 1;
+		csr_wr(CVMX_PCSX_MRX_CONTROL_REG(index, interface),
+		       control_reg.u64);
+		if (CVMX_WAIT_FOR_FIELD64(
+			    CVMX_PCSX_MRX_CONTROL_REG(index, interface),
+			    cvmx_pcsx_mrx_control_reg_t, reset, ==, 0, 10000)) {
+			debug("SGMII%x: Timeout waiting for port %d to finish reset\n",
+			      interface, index);
+			return -1;
+		}
+	}
+
+	/*
+	 * Write PCS*_MR*_CONTROL_REG[RST_AN]=1 to ensure a fresh
+	 * sgmii negotiation starts.
+	 */
+	phy_mode = cvmx_helper_get_mac_phy_mode(interface, index);
+	an_disable = (phy_mode ||
+		      !cvmx_helper_get_port_autonegotiation(interface, index));
+
+	control_reg.s.an_en = !an_disable;
+
+	/* Force a PCS reset by powering down the PCS interface
+	 * This is needed to deal with broken Qualcomm/Atheros PHYs and switches
+	 * which never recover if PCS is not power cycled.  The alternative
+	 * is to power cycle or hardware reset the Qualcomm devices whenever
+	 * SGMII is initialized.
+	 *
+	 * This is needed for the QCA8033 PHYs as well as the QCA833X switches
+	 * to work.  The QCA8337 switch has additional SGMII problems and is
+	 * best avoided if at all possible.  Failure to power cycle PCS prevents
+	 * any traffic from flowing between Octeon and Qualcomm devices if there
+	 * is a warm reset.  Even a software reset to the Qualcomm device will
+	 * not work.
+	 *
+	 * Note that this problem has been reported between Qualcomm and other
+	 * vendor's processors as well so this problem is not unique to
+	 * Qualcomm and Octeon.
+	 *
+	 * Power cycling PCS doesn't hurt anything with non-Qualcomm devices
+	 * other than adding a 25ms delay during initialization.
+	 */
+	control_reg.s.pwr_dn = 1;
+	csr_wr(CVMX_PCSX_MRX_CONTROL_REG(index, interface), control_reg.u64);
+	csr_rd(CVMX_PCSX_MRX_CONTROL_REG(index, interface));
+
+	/* 25ms should be enough, 10ms is too short */
+	mdelay(25);
+
+	control_reg.s.pwr_dn = 0;
+	csr_wr(CVMX_PCSX_MRX_CONTROL_REG(index, interface), control_reg.u64);
+
+	/* The Cortina PHY runs in 1000base-X mode */
+	mode_1000x = cvmx_helper_get_1000x_mode(interface, index);
+	pcsx_miscx_ctl_reg.u64 =
+		csr_rd(CVMX_PCSX_MISCX_CTL_REG(index, interface));
+	pcsx_miscx_ctl_reg.s.mode = mode_1000x;
+	pcsx_miscx_ctl_reg.s.mac_phy = phy_mode;
+	csr_wr(CVMX_PCSX_MISCX_CTL_REG(index, interface),
+	       pcsx_miscx_ctl_reg.u64);
+	if (an_disable)
+		/* In PHY mode we can't query the link status so we just
+		 * assume that the link is up.
+		 */
+		return 0;
+
+	/*
+	 * Wait for PCS*_MR*_STATUS_REG[AN_CPT] to be set, indicating
+	 * that sgmii autonegotiation is complete. In MAC mode this
+	 * isn't an ethernet link, but a link between Octeon and the
+	 * PHY.
+	 */
+	if (CVMX_WAIT_FOR_FIELD64(CVMX_PCSX_MRX_STATUS_REG(index, interface),
+				  union cvmx_pcsx_mrx_status_reg, an_cpt, ==, 1,
+				  10000)) {
+		debug("SGMII%x: Port %d link timeout\n", interface, index);
+		return -1;
+	}
+	return 0;
+}
+
+/**
+ * @INTERNAL
+ * Configure an SGMII link to the specified speed after the SERTES
+ * link is up.
+ *
+ * @param interface to init
+ * @param index     Index of prot on the interface
+ * @param link_info Link state to configure
+ *
+ * @return Zero on success, negative on failure
+ */
+static int
+__cvmx_helper_sgmii_hardware_init_link_speed(int interface, int index,
+					     cvmx_helper_link_info_t link_info)
+{
+	int is_enabled;
+	union cvmx_gmxx_prtx_cfg gmxx_prtx_cfg;
+	union cvmx_pcsx_miscx_ctl_reg pcsx_miscx_ctl_reg;
+
+	if (!cvmx_helper_is_port_valid(interface, index))
+		return 0;
+
+	/* Disable GMX before we make any changes. Remember the enable state */
+	gmxx_prtx_cfg.u64 = csr_rd(CVMX_GMXX_PRTX_CFG(index, interface));
+	is_enabled = gmxx_prtx_cfg.s.en;
+	gmxx_prtx_cfg.s.en = 0;
+	csr_wr(CVMX_GMXX_PRTX_CFG(index, interface), gmxx_prtx_cfg.u64);
+
+	/* Wait for GMX to be idle */
+	if (CVMX_WAIT_FOR_FIELD64(CVMX_GMXX_PRTX_CFG(index, interface),
+				  cvmx_gmxx_prtx_cfg_t, rx_idle, ==, 1,
+				  10000) ||
+	    CVMX_WAIT_FOR_FIELD64(CVMX_GMXX_PRTX_CFG(index, interface),
+				  cvmx_gmxx_prtx_cfg_t, tx_idle, ==, 1,
+				  10000)) {
+		debug("SGMII%d: Timeout waiting for port %d to be idle\n",
+		      interface, index);
+		return -1;
+	}
+
+	/* Read GMX CFG again to make sure the disable completed */
+	gmxx_prtx_cfg.u64 = csr_rd(CVMX_GMXX_PRTX_CFG(index, interface));
+
+	/*
+	 * Get the misc control for PCS. We will need to set the
+	 * duplication amount.
+	 */
+	pcsx_miscx_ctl_reg.u64 =
+		csr_rd(CVMX_PCSX_MISCX_CTL_REG(index, interface));
+
+	/*
+	 * Use GMXENO to force the link down if the status we get says
+	 * it should be down.
+	 */
+	pcsx_miscx_ctl_reg.s.gmxeno = !link_info.s.link_up;
+
+	/* Only change the duplex setting if the link is up */
+	if (link_info.s.link_up)
+		gmxx_prtx_cfg.s.duplex = link_info.s.full_duplex;
+
+	/* Do speed based setting for GMX */
+	switch (link_info.s.speed) {
+	case 10:
+		gmxx_prtx_cfg.s.speed = 0;
+		gmxx_prtx_cfg.s.speed_msb = 1;
+		gmxx_prtx_cfg.s.slottime = 0;
+		/* Setting from GMX-603 */
+		pcsx_miscx_ctl_reg.s.samp_pt = 25;
+		csr_wr(CVMX_GMXX_TXX_SLOT(index, interface), 64);
+		csr_wr(CVMX_GMXX_TXX_BURST(index, interface), 0);
+		break;
+	case 100:
+		gmxx_prtx_cfg.s.speed = 0;
+		gmxx_prtx_cfg.s.speed_msb = 0;
+		gmxx_prtx_cfg.s.slottime = 0;
+		pcsx_miscx_ctl_reg.s.samp_pt = 0x5;
+		csr_wr(CVMX_GMXX_TXX_SLOT(index, interface), 64);
+		csr_wr(CVMX_GMXX_TXX_BURST(index, interface), 0);
+		break;
+	case 1000:
+		gmxx_prtx_cfg.s.speed = 1;
+		gmxx_prtx_cfg.s.speed_msb = 0;
+		gmxx_prtx_cfg.s.slottime = 1;
+		pcsx_miscx_ctl_reg.s.samp_pt = 1;
+		csr_wr(CVMX_GMXX_TXX_SLOT(index, interface), 512);
+		if (gmxx_prtx_cfg.s.duplex)
+			/* full duplex */
+			csr_wr(CVMX_GMXX_TXX_BURST(index, interface), 0);
+		else
+			/* half duplex */
+			csr_wr(CVMX_GMXX_TXX_BURST(index, interface), 8192);
+		break;
+	default:
+		break;
+	}
+
+	/* Write the new misc control for PCS */
+	csr_wr(CVMX_PCSX_MISCX_CTL_REG(index, interface),
+	       pcsx_miscx_ctl_reg.u64);
+
+	/* Write the new GMX settings with the port still disabled */
+	csr_wr(CVMX_GMXX_PRTX_CFG(index, interface), gmxx_prtx_cfg.u64);
+
+	/* Read GMX CFG again to make sure the config completed */
+	gmxx_prtx_cfg.u64 = csr_rd(CVMX_GMXX_PRTX_CFG(index, interface));
+
+	/* Restore the enabled / disabled state */
+	gmxx_prtx_cfg.s.en = is_enabled;
+	csr_wr(CVMX_GMXX_PRTX_CFG(index, interface), gmxx_prtx_cfg.u64);
+
+	return 0;
+}
+
+/**
+ * @INTERNAL
+ * Bring up the SGMII interface to be ready for packet I/O but
+ * leave I/O disabled using the GMX override. This function
+ * follows the bringup documented in 10.6.3 of the manual.
+ *
+ * @param interface to bringup
+ * @param num_ports Number of ports on the interface
+ *
+ * @return Zero on success, negative on failure
+ */
+static int __cvmx_helper_sgmii_hardware_init(int interface, int num_ports)
+{
+	int index;
+	int do_link_set = 1;
+
+	/*
+	 * CN63XX Pass 1.0 errata G-14395 requires the QLM De-emphasis
+	 * be programmed.
+	 */
+	if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_0)) {
+		union cvmx_ciu_qlm2 ciu_qlm;
+
+		ciu_qlm.u64 = csr_rd(CVMX_CIU_QLM2);
+		ciu_qlm.s.txbypass = 1;
+		ciu_qlm.s.txdeemph = 0xf;
+		ciu_qlm.s.txmargin = 0xd;
+		csr_wr(CVMX_CIU_QLM2, ciu_qlm.u64);
+	}
+
+	/*
+	 * CN63XX Pass 2.x errata G-15273 requires the QLM De-emphasis
+	 * be programmed when using a 156.25Mhz ref clock.
+	 */
+	if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS2_X)) {
+		/* Read the QLM speed pins */
+		union cvmx_mio_rst_boot mio_rst_boot;
+
+		mio_rst_boot.u64 = csr_rd(CVMX_MIO_RST_BOOT);
+
+		if (mio_rst_boot.cn63xx.qlm2_spd == 4) {
+			union cvmx_ciu_qlm2 ciu_qlm;
+
+			ciu_qlm.u64 = csr_rd(CVMX_CIU_QLM2);
+			ciu_qlm.s.txbypass = 1;
+			ciu_qlm.s.txdeemph = 0x0;
+			ciu_qlm.s.txmargin = 0xf;
+			csr_wr(CVMX_CIU_QLM2, ciu_qlm.u64);
+		}
+	}
+
+	__cvmx_helper_setup_gmx(interface, num_ports);
+
+	for (index = 0; index < num_ports; index++) {
+		int ipd_port = cvmx_helper_get_ipd_port(interface, index);
+
+		if (!cvmx_helper_is_port_valid(interface, index))
+			continue;
+		__cvmx_helper_sgmii_hardware_init_one_time(interface, index);
+		if (do_link_set)
+			__cvmx_helper_sgmii_link_set(ipd_port,
+						     __cvmx_helper_sgmii_link_get(ipd_port));
+	}
+
+	return 0;
+}
+
+int __cvmx_helper_sgmii_enumerate(int xiface)
+{
+	if (OCTEON_IS_MODEL(OCTEON_CNF71XX))
+		return 2;
+	if (OCTEON_IS_MODEL(OCTEON_CN70XX)) {
+		struct cvmx_xiface xi =
+			cvmx_helper_xiface_to_node_interface(xiface);
+		enum cvmx_qlm_mode qlm_mode =
+			cvmx_qlm_get_dlm_mode(0, xi.interface);
+
+		if (qlm_mode == CVMX_QLM_MODE_SGMII)
+			return 1;
+		else if (qlm_mode == CVMX_QLM_MODE_QSGMII)
+			return 4;
+		return 0;
+	}
+	return 4;
+}
+
+/**
+ * @INTERNAL
+ * Probe a SGMII interface and determine the number of ports
+ * connected to it. The SGMII interface should still be down after
+ * this call.
+ *
+ * @param xiface Interface to probe
+ *
+ * @return Number of ports on the interface. Zero to disable.
+ */
+int __cvmx_helper_sgmii_probe(int xiface)
+{
+	struct cvmx_xiface xi = cvmx_helper_xiface_to_node_interface(xiface);
+	int interface = xi.interface;
+	union cvmx_gmxx_inf_mode mode;
+	int ports;
+
+	/*
+	 * Check if QLM is configured correct for SGMII, verify the
+	 * speed as well as mode.
+	 */
+	if (OCTEON_IS_OCTEON2()) {
+		int qlm = cvmx_qlm_interface(xiface);
+
+		if (cvmx_qlm_get_mode(qlm) != CVMX_QLM_MODE_SGMII)
+			return 0;
+	}
+
+	/* Do not enable the interface if is not in SGMII mode */
+	ports = __cvmx_helper_sgmii_enumerate(xiface);
+
+	if (ports <= 0)
+		return 0;
+
+	/*
+	 * Due to errata GMX-700 on CN56XXp1.x and CN52XXp1.x, the
+	 * interface needs to be enabled before IPD otherwise per port
+	 * backpressure may not work properly.
+	 */
+	mode.u64 = csr_rd(CVMX_GMXX_INF_MODE(interface));
+	mode.s.en = 1;
+	csr_wr(CVMX_GMXX_INF_MODE(interface), mode.u64);
+
+	return ports;
+}
+
+/**
+ * @INTERNAL
+ * Bringup and enable a SGMII interface. After this call packet
+ * I/O should be fully functional. This is called with IPD
+ * enabled but PKO disabled.
+ *
+ * @param xiface Interface to bring up
+ *
+ * @return Zero on success, negative on failure
+ */
+int __cvmx_helper_sgmii_enable(int xiface)
+{
+	int num_ports = cvmx_helper_ports_on_interface(xiface);
+	struct cvmx_xiface xi = cvmx_helper_xiface_to_node_interface(xiface);
+	int interface = xi.interface;
+	int index;
+
+	/* Setup PKND and BPID */
+	if (octeon_has_feature(OCTEON_FEATURE_PKND)) {
+		for (index = 0; index < num_ports; index++) {
+			union cvmx_gmxx_bpid_msk bpid_msk;
+			union cvmx_gmxx_bpid_mapx bpid_map;
+			union cvmx_gmxx_prtx_cfg gmxx_prtx_cfg;
+
+			if (!cvmx_helper_is_port_valid(interface, index))
+				continue;
+			/* Setup PKIND */
+			gmxx_prtx_cfg.u64 =
+				csr_rd(CVMX_GMXX_PRTX_CFG(index, interface));
+			gmxx_prtx_cfg.s.pknd =
+				cvmx_helper_get_pknd(interface, index);
+			csr_wr(CVMX_GMXX_PRTX_CFG(index, interface),
+			       gmxx_prtx_cfg.u64);
+
+			/* Setup BPID */
+			bpid_map.u64 =
+				csr_rd(CVMX_GMXX_BPID_MAPX(index, interface));
+			bpid_map.s.val = 1;
+			bpid_map.s.bpid =
+				cvmx_helper_get_bpid(interface, index);
+			csr_wr(CVMX_GMXX_BPID_MAPX(index, interface),
+			       bpid_map.u64);
+
+			bpid_msk.u64 = csr_rd(CVMX_GMXX_BPID_MSK(interface));
+			bpid_msk.s.msk_or |= (1 << index);
+			bpid_msk.s.msk_and &= ~(1 << index);
+			csr_wr(CVMX_GMXX_BPID_MSK(interface), bpid_msk.u64);
+		}
+	}
+
+	__cvmx_helper_sgmii_hardware_init(interface, num_ports);
+
+	/* CN68XX adds the padding and FCS in PKO, not GMX */
+	if (OCTEON_IS_MODEL(OCTEON_CN68XX)) {
+		union cvmx_gmxx_txx_append gmxx_txx_append_cfg;
+
+		for (index = 0; index < num_ports; index++) {
+			if (!cvmx_helper_is_port_valid(interface, index))
+				continue;
+			gmxx_txx_append_cfg.u64 =
+				csr_rd(CVMX_GMXX_TXX_APPEND(index, interface));
+			gmxx_txx_append_cfg.s.fcs = 0;
+			gmxx_txx_append_cfg.s.pad = 0;
+			csr_wr(CVMX_GMXX_TXX_APPEND(index, interface),
+			       gmxx_txx_append_cfg.u64);
+		}
+	}
+
+	/* Enable running disparity check for QSGMII interface */
+	if (OCTEON_IS_MODEL(OCTEON_CN70XX) && num_ports > 1) {
+		union cvmx_gmxx_qsgmii_ctl qsgmii_ctl;
+
+		qsgmii_ctl.u64 = 0;
+		qsgmii_ctl.s.disparity = 1;
+		csr_wr(CVMX_GMXX_QSGMII_CTL(interface), qsgmii_ctl.u64);
+	}
+
+	for (index = 0; index < num_ports; index++) {
+		union cvmx_gmxx_txx_append append_cfg;
+		union cvmx_gmxx_txx_sgmii_ctl sgmii_ctl;
+		union cvmx_gmxx_prtx_cfg gmxx_prtx_cfg;
+
+		if (!cvmx_helper_is_port_valid(interface, index))
+			continue;
+		/*
+		 * Clear the align bit if preamble is set to attain
+		 * maximum tx rate.
+		 */
+		append_cfg.u64 = csr_rd(CVMX_GMXX_TXX_APPEND(index, interface));
+		sgmii_ctl.u64 =
+			csr_rd(CVMX_GMXX_TXX_SGMII_CTL(index, interface));
+		sgmii_ctl.s.align = append_cfg.s.preamble ? 0 : 1;
+		csr_wr(CVMX_GMXX_TXX_SGMII_CTL(index, interface),
+		       sgmii_ctl.u64);
+
+		gmxx_prtx_cfg.u64 =
+			csr_rd(CVMX_GMXX_PRTX_CFG(index, interface));
+		gmxx_prtx_cfg.s.en = 1;
+		csr_wr(CVMX_GMXX_PRTX_CFG(index, interface), gmxx_prtx_cfg.u64);
+	}
+	return 0;
+}
+
+/**
+ * @INTERNAL
+ * Return the link state of an IPD/PKO port as returned by
+ * auto negotiation. The result of this function may not match
+ * Octeon's link config if auto negotiation has changed since
+ * the last call to cvmx_helper_link_set().
+ *
+ * @param ipd_port IPD/PKO port to query
+ *
+ * @return Link state
+ */
+cvmx_helper_link_info_t __cvmx_helper_sgmii_link_get(int ipd_port)
+{
+	cvmx_helper_link_info_t result;
+	union cvmx_pcsx_miscx_ctl_reg pcsx_miscx_ctl_reg;
+	int interface = cvmx_helper_get_interface_num(ipd_port);
+	int index = cvmx_helper_get_interface_index_num(ipd_port);
+	union cvmx_pcsx_mrx_control_reg pcsx_mrx_control_reg;
+	int speed = 1000;
+	int qlm;
+
+	result.u64 = 0;
+
+	if (!cvmx_helper_is_port_valid(interface, index))
+		return result;
+
+	if (OCTEON_IS_MODEL(OCTEON_CN66XX)) {
+		union cvmx_gmxx_inf_mode inf_mode;
+
+		inf_mode.u64 = csr_rd(CVMX_GMXX_INF_MODE(interface));
+		if (inf_mode.s.rate & (1 << index))
+			speed = 2500;
+		else
+			speed = 1000;
+	} else if (OCTEON_IS_MODEL(OCTEON_CN6XXX)) {
+		qlm = cvmx_qlm_interface(interface);
+		speed = cvmx_qlm_get_gbaud_mhz(qlm) * 8 / 10;
+	} else if (OCTEON_IS_MODEL(OCTEON_CNF71XX)) {
+		speed = cvmx_qlm_get_gbaud_mhz(0) * 8 / 10;
+	} else if (OCTEON_IS_MODEL(OCTEON_CN70XX)) {
+		speed = cvmx_qlm_get_gbaud_mhz(0) * 8 / 10;
+		if (cvmx_qlm_get_dlm_mode(0, interface) == CVMX_QLM_MODE_SGMII)
+			speed >>= 1;
+		else
+			speed >>= 2;
+	}
+
+	pcsx_mrx_control_reg.u64 =
+		csr_rd(CVMX_PCSX_MRX_CONTROL_REG(index, interface));
+	if (pcsx_mrx_control_reg.s.loopbck1) {
+		/* Force 1Gbps full duplex link for internal loopback */
+		result.s.link_up = 1;
+		result.s.full_duplex = 1;
+		result.s.speed = speed;
+		return result;
+	}
+
+	pcsx_miscx_ctl_reg.u64 =
+		csr_rd(CVMX_PCSX_MISCX_CTL_REG(index, interface));
+	if (pcsx_miscx_ctl_reg.s.mac_phy ||
+	    cvmx_helper_get_port_force_link_up(interface, index)) {
+		/* PHY Mode */
+		/* Note that this also works for 1000base-X mode */
+
+		result.s.speed = speed;
+		result.s.full_duplex = 1;
+		result.s.link_up = 1;
+		return result;
+	}
+
+	/* MAC Mode */
+	return __cvmx_helper_board_link_get(ipd_port);
+}
+
+/**
+ * @INTERNAL
+ * Configure an IPD/PKO port for the specified link state. This
+ * function does not influence auto negotiation at the PHY level.
+ * The passed link state must always match the link state returned
+ * by cvmx_helper_link_get(). It is normally best to use
+ * cvmx_helper_link_autoconf() instead.
+ *
+ * @param ipd_port  IPD/PKO port to configure
+ * @param link_info The new link state
+ *
+ * @return Zero on success, negative on failure
+ */
+int __cvmx_helper_sgmii_link_set(int ipd_port,
+				 cvmx_helper_link_info_t link_info)
+{
+	union cvmx_pcsx_mrx_control_reg control_reg;
+	int interface = cvmx_helper_get_interface_num(ipd_port);
+	int index = cvmx_helper_get_interface_index_num(ipd_port);
+
+	if (!cvmx_helper_is_port_valid(interface, index))
+		return 0;
+
+	/* For some devices, i.e. the Qualcomm QCA8337 switch we need to power
+	 * down the PCS interface when the link goes down and power it back
+	 * up when the link returns.
+	 */
+	if (link_info.s.link_up || !__cvmx_helper_need_g15618()) {
+		__cvmx_helper_sgmii_hardware_init_link(interface, index);
+	} else {
+		union cvmx_pcsx_miscx_ctl_reg pcsx_miscx_ctl_reg;
+
+		pcsx_miscx_ctl_reg.u64 =
+			csr_rd(CVMX_PCSX_MISCX_CTL_REG(index, interface));
+
+		/* Disable autonegotiation when MAC mode is enabled or
+		 * autonegotiation is disabled.
+		 */
+		control_reg.u64 =
+			csr_rd(CVMX_PCSX_MRX_CONTROL_REG(index, interface));
+		if (pcsx_miscx_ctl_reg.s.mac_phy == 0 ||
+		    !cvmx_helper_get_port_autonegotiation(interface, index)) {
+			control_reg.s.an_en = 0;
+			control_reg.s.spdmsb = 1;
+			control_reg.s.spdlsb = 0;
+			control_reg.s.dup = 1;
+		}
+		csr_wr(CVMX_PCSX_MRX_CONTROL_REG(index, interface),
+		       control_reg.u64);
+		csr_rd(CVMX_PCSX_MRX_CONTROL_REG(index, interface));
+		/*
+		 * Use GMXENO to force the link down it will get
+		 * reenabled later...
+		 */
+		pcsx_miscx_ctl_reg.s.gmxeno = 1;
+		csr_wr(CVMX_PCSX_MISCX_CTL_REG(index, interface),
+		       pcsx_miscx_ctl_reg.u64);
+		csr_rd(CVMX_PCSX_MISCX_CTL_REG(index, interface));
+		return 0;
+	}
+	return __cvmx_helper_sgmii_hardware_init_link_speed(interface, index,
+							    link_info);
+}
+
+/**
+ * @INTERNAL
+ * Configure a port for internal and/or external loopback. Internal loopback
+ * causes packets sent by the port to be received by Octeon. External loopback
+ * causes packets received from the wire to sent out again.
+ *
+ * @param ipd_port IPD/PKO port to loopback.
+ * @param enable_internal
+ *                 Non zero if you want internal loopback
+ * @param enable_external
+ *                 Non zero if you want external loopback
+ *
+ * @return Zero on success, negative on failure.
+ */
+int __cvmx_helper_sgmii_configure_loopback(int ipd_port, int enable_internal,
+					   int enable_external)
+{
+	int interface = cvmx_helper_get_interface_num(ipd_port);
+	int index = cvmx_helper_get_interface_index_num(ipd_port);
+	union cvmx_pcsx_mrx_control_reg pcsx_mrx_control_reg;
+	union cvmx_pcsx_miscx_ctl_reg pcsx_miscx_ctl_reg;
+
+	if (!cvmx_helper_is_port_valid(interface, index))
+		return 0;
+
+	pcsx_mrx_control_reg.u64 =
+		csr_rd(CVMX_PCSX_MRX_CONTROL_REG(index, interface));
+	pcsx_mrx_control_reg.s.loopbck1 = enable_internal;
+	csr_wr(CVMX_PCSX_MRX_CONTROL_REG(index, interface),
+	       pcsx_mrx_control_reg.u64);
+
+	pcsx_miscx_ctl_reg.u64 =
+		csr_rd(CVMX_PCSX_MISCX_CTL_REG(index, interface));
+	pcsx_miscx_ctl_reg.s.loopbck2 = enable_external;
+	csr_wr(CVMX_PCSX_MISCX_CTL_REG(index, interface),
+	       pcsx_miscx_ctl_reg.u64);
+
+	__cvmx_helper_sgmii_hardware_init_link(interface, index);
+	return 0;
+}