[PATCH v2 20/52] mips: octeon: Add cvmx-helper-rgmii.c

Stefan Roese
2022-04-07T07:24:24Z

Import cvmx-helper-rgmii.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>
---
arch/mips/mach-octeon/cvmx-helper-rgmii.c | 398 ++++++++++++++++++++++
1 file changed, 398 insertions(+)
create mode 100644 arch/mips/mach-octeon/cvmx-helper-rgmii.c

diff --git a/arch/mips/mach-octeon/cvmx-helper-rgmii.c b/arch/mips/mach-octeon/cvmx-helper-rgmii.c
new file mode 100644
index 000000000000..dc19c3bc1d9b
--- /dev/null
+++ b/arch/mips/mach-octeon/cvmx-helper-rgmii.c
@@ -0,0 +1,398 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018-2022 Marvell International Ltd.
+ *
+ * Functions for RGMII/GMII/MII initialization, configuration,
+ * and monitoring.
+ */
+
+#include <log.h>
+#include <time.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-helper.h>
+#include <mach/cvmx-helper-board.h>
+
+#include <mach/cvmx-hwpko.h>
+
+#include <mach/cvmx-asxx-defs.h>
+#include <mach/cvmx-dbg-defs.h>
+#include <mach/cvmx-gmxx-defs.h>
+#include <mach/cvmx-npi-defs.h>
+#include <mach/cvmx-pko-defs.h>
+
+/**
+ * @INTERNAL
+ * Probe RGMII ports and determine the number present
+ *
+ * @param xiface Interface to probe
+ *
+ * @return Number of RGMII/GMII/MII ports (0-4).
+ */
+int __cvmx_helper_rgmii_probe(int xiface)
+{
+ struct cvmx_xiface xi = cvmx_helper_xiface_to_node_interface(xiface);
+ int num_ports = 0;
+ union cvmx_gmxx_inf_mode mode;
+
+ mode.u64 = csr_rd(CVMX_GMXX_INF_MODE(xi.interface));
+
+ if (mode.s.type)
+ debug("ERROR: Unsupported Octeon model in %s\n", __func__);
+ else
+ debug("ERROR: Unsupported Octeon model in %s\n", __func__);
+ return num_ports;
+}
+
+/**
+ * @INTERNAL
+ * Configure all of the ASX, GMX, and PKO regsiters required
+ * to get RGMII to function on the supplied interface.
+ *
+ * @param xiface PKO Interface to configure (0 or 1)
+ *
+ * @return Zero on success
+ */
+int __cvmx_helper_rgmii_enable(int xiface)
+{
+ struct cvmx_xiface xi = cvmx_helper_xiface_to_node_interface(xiface);
+ int interface = xi.interface;
+ int num_ports = cvmx_helper_ports_on_interface(interface);
+ int port;
+ union cvmx_gmxx_inf_mode mode;
+ union cvmx_asxx_tx_prt_en asx_tx;
+ union cvmx_asxx_rx_prt_en asx_rx;
+
+ mode.u64 = csr_rd(CVMX_GMXX_INF_MODE(interface));
+
+ if (num_ports == -1)
+ return -1;
+ if (mode.s.en == 0)
+ return -1;
+
+ /* Configure the ASX registers needed to use the RGMII ports */
+ asx_tx.u64 = 0;
+ asx_tx.s.prt_en = cvmx_build_mask(num_ports);
+ csr_wr(CVMX_ASXX_TX_PRT_EN(interface), asx_tx.u64);
+
+ asx_rx.u64 = 0;
+ asx_rx.s.prt_en = cvmx_build_mask(num_ports);
+ csr_wr(CVMX_ASXX_RX_PRT_EN(interface), asx_rx.u64);
+
+ /* Configure the GMX registers needed to use the RGMII ports */
+ for (port = 0; port < num_ports; port++) {
+ /*
+ * Configure more flexible RGMII preamble
+ * checking. Pass 1 doesn't support this feature.
+ */
+ union cvmx_gmxx_rxx_frm_ctl frm_ctl;
+
+ frm_ctl.u64 = csr_rd(CVMX_GMXX_RXX_FRM_CTL(port, interface));
+ /* New field, so must be compile time */
+ frm_ctl.s.pre_free = 1;
+ csr_wr(CVMX_GMXX_RXX_FRM_CTL(port, interface), frm_ctl.u64);
+
+ /*
+ * Each pause frame transmitted will ask for about 10M
+ * bit times before resume. If buffer space comes
+ * available before that time has expired, an XON
+ * pause frame (0 time) will be transmitted to restart
+ * the flow.
+ */
+ csr_wr(CVMX_GMXX_TXX_PAUSE_PKT_TIME(port, interface), 20000);
+ csr_wr(CVMX_GMXX_TXX_PAUSE_PKT_INTERVAL(port, interface),
+ 19000);
+
+ csr_wr(CVMX_ASXX_TX_CLK_SETX(port, interface), 24);
+ csr_wr(CVMX_ASXX_RX_CLK_SETX(port, interface), 24);
+ }
+
+ __cvmx_helper_setup_gmx(interface, num_ports);
+
+ /* enable the ports now */
+ for (port = 0; port < num_ports; port++) {
+ union cvmx_gmxx_prtx_cfg gmx_cfg;
+
+ cvmx_helper_link_autoconf(
+ cvmx_helper_get_ipd_port(interface, port));
+ gmx_cfg.u64 = csr_rd(CVMX_GMXX_PRTX_CFG(port, interface));
+ gmx_cfg.s.en = 1;
+ csr_wr(CVMX_GMXX_PRTX_CFG(port, interface), gmx_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_rgmii_link_get(int ipd_port)
+{
+ int interface = cvmx_helper_get_interface_num(ipd_port);
+ int index = cvmx_helper_get_interface_index_num(ipd_port);
+ union cvmx_asxx_prt_loop asxx_prt_loop;
+
+ asxx_prt_loop.u64 = csr_rd(CVMX_ASXX_PRT_LOOP(interface));
+ if (asxx_prt_loop.s.int_loop & (1 << index)) {
+ /* Force 1Gbps full duplex on internal loopback */
+ cvmx_helper_link_info_t result;
+
+ result.u64 = 0;
+ result.s.full_duplex = 1;
+ result.s.link_up = 1;
+ result.s.speed = 1000;
+ return result;
+ } else {
+ return __cvmx_helper_board_link_get(ipd_port);
+ }
+}
+
+/**
+ * @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_gmii_link_get(int ipd_port)
+{
+ cvmx_helper_link_info_t result;
+ int index = cvmx_helper_get_interface_index_num(ipd_port);
+
+ if (index == 0) {
+ result = __cvmx_helper_rgmii_link_get(ipd_port);
+ } else {
+ result.s.full_duplex = 1;
+ result.s.link_up = 1;
+ result.s.speed = 1000;
+ }
+
+ return result;
+}
+
+/**
+ * @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_rgmii_link_set(int ipd_port,
+ cvmx_helper_link_info_t link_info)
+{
+ int result = 0;
+ int interface = cvmx_helper_get_interface_num(ipd_port);
+ int index = cvmx_helper_get_interface_index_num(ipd_port);
+ union cvmx_gmxx_prtx_cfg original_gmx_cfg;
+ union cvmx_gmxx_prtx_cfg new_gmx_cfg;
+ union cvmx_pko_mem_queue_qos pko_mem_queue_qos;
+ union cvmx_pko_mem_queue_qos pko_mem_queue_qos_save[16];
+ union cvmx_gmxx_tx_ovr_bp gmx_tx_ovr_bp;
+ union cvmx_gmxx_tx_ovr_bp gmx_tx_ovr_bp_save;
+ int i;
+
+ /* Read the current settings so we know the current enable state */
+ original_gmx_cfg.u64 = csr_rd(CVMX_GMXX_PRTX_CFG(index, interface));
+ new_gmx_cfg = original_gmx_cfg;
+
+ /* Disable the lowest level RX */
+ csr_wr(CVMX_ASXX_RX_PRT_EN(interface),
+ csr_rd(CVMX_ASXX_RX_PRT_EN(interface)) & ~(1 << index));
+
+ memset(pko_mem_queue_qos_save, 0, sizeof(pko_mem_queue_qos_save));
+ /* Disable all queues so that TX should become idle */
+ for (i = 0; i < cvmx_pko_get_num_queues(ipd_port); i++) {
+ int queue = cvmx_pko_get_base_queue(ipd_port) + i;
+
+ csr_wr(CVMX_PKO_REG_READ_IDX, queue);
+ pko_mem_queue_qos.u64 = csr_rd(CVMX_PKO_MEM_QUEUE_QOS);
+ pko_mem_queue_qos.s.pid = ipd_port;
+ pko_mem_queue_qos.s.qid = queue;
+ pko_mem_queue_qos_save[i] = pko_mem_queue_qos;
+ pko_mem_queue_qos.s.qos_mask = 0;
+ csr_wr(CVMX_PKO_MEM_QUEUE_QOS, pko_mem_queue_qos.u64);
+ }
+
+ /* Disable backpressure */
+ gmx_tx_ovr_bp.u64 = csr_rd(CVMX_GMXX_TX_OVR_BP(interface));
+ gmx_tx_ovr_bp_save = gmx_tx_ovr_bp;
+ gmx_tx_ovr_bp.s.bp &= ~(1 << index);
+ gmx_tx_ovr_bp.s.en |= 1 << index;
+ csr_wr(CVMX_GMXX_TX_OVR_BP(interface), gmx_tx_ovr_bp.u64);
+ csr_rd(CVMX_GMXX_TX_OVR_BP(interface));
+
+ /*
+ * Poll the GMX state machine waiting for it to become
+ * idle. Preferably we should only change speed when it is
+ * idle. If it doesn't become idle we will still do the speed
+ * change, but there is a slight chance that GMX will
+ * lockup.
+ */
+ csr_wr(CVMX_NPI_DBG_SELECT, interface * 0x800 + index * 0x100 + 0x880);
+ CVMX_WAIT_FOR_FIELD64(CVMX_DBG_DATA, cvmx_dbg_data_t, data & 7, ==, 0,
+ 10000);
+ CVMX_WAIT_FOR_FIELD64(CVMX_DBG_DATA, cvmx_dbg_data_t, data & 0xf, ==, 0,
+ 10000);
+
+ /* Disable the port before we make any changes */
+ new_gmx_cfg.s.en = 0;
+ csr_wr(CVMX_GMXX_PRTX_CFG(index, interface), new_gmx_cfg.u64);
+ csr_rd(CVMX_GMXX_PRTX_CFG(index, interface));
+
+ /* Set full/half duplex */
+ if (!link_info.s.link_up)
+ /* Force full duplex on down links */
+ new_gmx_cfg.s.duplex = 1;
+ else
+ new_gmx_cfg.s.duplex = link_info.s.full_duplex;
+
+ /* Set the link speed. Anything unknown is set to 1Gbps */
+ if (link_info.s.speed == 10) {
+ new_gmx_cfg.s.slottime = 0;
+ new_gmx_cfg.s.speed = 0;
+ } else if (link_info.s.speed == 100) {
+ new_gmx_cfg.s.slottime = 0;
+ new_gmx_cfg.s.speed = 0;
+ } else {
+ new_gmx_cfg.s.slottime = 1;
+ new_gmx_cfg.s.speed = 1;
+ }
+
+ /* Adjust the clocks */
+ if (link_info.s.speed == 10) {
+ csr_wr(CVMX_GMXX_TXX_CLK(index, interface), 50);
+ csr_wr(CVMX_GMXX_TXX_SLOT(index, interface), 0x40);
+ csr_wr(CVMX_GMXX_TXX_BURST(index, interface), 0);
+ } else if (link_info.s.speed == 100) {
+ csr_wr(CVMX_GMXX_TXX_CLK(index, interface), 5);
+ csr_wr(CVMX_GMXX_TXX_SLOT(index, interface), 0x40);
+ csr_wr(CVMX_GMXX_TXX_BURST(index, interface), 0);
+ } else {
+ csr_wr(CVMX_GMXX_TXX_CLK(index, interface), 1);
+ csr_wr(CVMX_GMXX_TXX_SLOT(index, interface), 0x200);
+ csr_wr(CVMX_GMXX_TXX_BURST(index, interface), 0x2000);
+ }
+
+ /* Do a read to make sure all setup stuff is complete */
+ csr_rd(CVMX_GMXX_PRTX_CFG(index, interface));
+
+ /* Save the new GMX setting without enabling the port */
+ csr_wr(CVMX_GMXX_PRTX_CFG(index, interface), new_gmx_cfg.u64);
+
+ /* Enable the lowest level RX */
+ if (link_info.s.link_up)
+ csr_wr(CVMX_ASXX_RX_PRT_EN(interface),
+ csr_rd(CVMX_ASXX_RX_PRT_EN(interface)) | (1 << index));
+
+ /* Re-enable the TX path */
+ for (i = 0; i < cvmx_pko_get_num_queues(ipd_port); i++) {
+ int queue = cvmx_pko_get_base_queue(ipd_port) + i;
+
+ csr_wr(CVMX_PKO_REG_READ_IDX, queue);
+ csr_wr(CVMX_PKO_MEM_QUEUE_QOS, pko_mem_queue_qos_save[i].u64);
+ }
+
+ /* Restore backpressure */
+ csr_wr(CVMX_GMXX_TX_OVR_BP(interface), gmx_tx_ovr_bp_save.u64);
+
+ /* Restore the GMX enable state. Port config is complete */
+ new_gmx_cfg.s.en = original_gmx_cfg.s.en;
+ csr_wr(CVMX_GMXX_PRTX_CFG(index, interface), new_gmx_cfg.u64);
+
+ return result;
+}
+
+/**
+ * @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_rgmii_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);
+ int original_enable;
+ union cvmx_gmxx_prtx_cfg gmx_cfg;
+ union cvmx_asxx_prt_loop asxx_prt_loop;
+
+ /* Read the current enable state and save it */
+ gmx_cfg.u64 = csr_rd(CVMX_GMXX_PRTX_CFG(index, interface));
+ original_enable = gmx_cfg.s.en;
+ /* Force port to be disabled */
+ gmx_cfg.s.en = 0;
+ if (enable_internal) {
+ /* Force speed if we're doing internal loopback */
+ gmx_cfg.s.duplex = 1;
+ gmx_cfg.s.slottime = 1;
+ gmx_cfg.s.speed = 1;
+ csr_wr(CVMX_GMXX_TXX_CLK(index, interface), 1);
+ csr_wr(CVMX_GMXX_TXX_SLOT(index, interface), 0x200);
+ csr_wr(CVMX_GMXX_TXX_BURST(index, interface), 0x2000);
+ }
+ csr_wr(CVMX_GMXX_PRTX_CFG(index, interface), gmx_cfg.u64);
+
+ /* Set the loopback bits */
+ asxx_prt_loop.u64 = csr_rd(CVMX_ASXX_PRT_LOOP(interface));
+ if (enable_internal)
+ asxx_prt_loop.s.int_loop |= 1 << index;
+ else
+ asxx_prt_loop.s.int_loop &= ~(1 << index);
+ if (enable_external)
+ asxx_prt_loop.s.ext_loop |= 1 << index;
+ else
+ asxx_prt_loop.s.ext_loop &= ~(1 << index);
+ csr_wr(CVMX_ASXX_PRT_LOOP(interface), asxx_prt_loop.u64);
+
+ /* Force enables in internal loopback */
+ if (enable_internal) {
+ u64 tmp;
+
+ tmp = csr_rd(CVMX_ASXX_TX_PRT_EN(interface));
+ csr_wr(CVMX_ASXX_TX_PRT_EN(interface), (1 << index) | tmp);
+ tmp = csr_rd(CVMX_ASXX_RX_PRT_EN(interface));
+ csr_wr(CVMX_ASXX_RX_PRT_EN(interface), (1 << index) | tmp);
+ original_enable = 1;
+ }
+
+ /* Restore the enable state */
+ gmx_cfg.s.en = original_enable;
+ csr_wr(CVMX_GMXX_PRTX_CFG(index, interface), gmx_cfg.u64);
+ return 0;
+}
--
2.35.1