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-rw-r--r--arch/mips/cavium-octeon/executive/cvmx-helper-util.c363
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diff --git a/arch/mips/cavium-octeon/executive/cvmx-helper-util.c b/arch/mips/cavium-octeon/executive/cvmx-helper-util.c
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+/***********************license start***************
+ * Author: Cavium Networks
+ *
+ * Contact: support@caviumnetworks.com
+ * This file is part of the OCTEON SDK
+ *
+ * Copyright (c) 2003-2008 Cavium Networks
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, Version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
+ * NONINFRINGEMENT. See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this file; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ * or visit http://www.gnu.org/licenses/.
+ *
+ * This file may also be available under a different license from Cavium.
+ * Contact Cavium Networks for more information
+ ***********************license end**************************************/
+
+/*
+ * Small helper utilities.
+ */
+#include <linux/kernel.h>
+
+#include <asm/octeon/octeon.h>
+
+#include <asm/octeon/cvmx-config.h>
+
+#include <asm/octeon/cvmx-fpa.h>
+#include <asm/octeon/cvmx-pip.h>
+#include <asm/octeon/cvmx-pko.h>
+#include <asm/octeon/cvmx-ipd.h>
+#include <asm/octeon/cvmx-spi.h>
+
+#include <asm/octeon/cvmx-helper.h>
+#include <asm/octeon/cvmx-helper-util.h>
+
+#include <asm/octeon/cvmx-ipd-defs.h>
+
+/**
+ * Convert a interface mode into a human readable string
+ *
+ * @mode: Mode to convert
+ *
+ * Returns String
+ */
+const char *cvmx_helper_interface_mode_to_string(cvmx_helper_interface_mode_t
+ mode)
+{
+ switch (mode) {
+ case CVMX_HELPER_INTERFACE_MODE_DISABLED:
+ return "DISABLED";
+ case CVMX_HELPER_INTERFACE_MODE_RGMII:
+ return "RGMII";
+ case CVMX_HELPER_INTERFACE_MODE_GMII:
+ return "GMII";
+ case CVMX_HELPER_INTERFACE_MODE_SPI:
+ return "SPI";
+ case CVMX_HELPER_INTERFACE_MODE_PCIE:
+ return "PCIE";
+ case CVMX_HELPER_INTERFACE_MODE_XAUI:
+ return "XAUI";
+ case CVMX_HELPER_INTERFACE_MODE_SGMII:
+ return "SGMII";
+ case CVMX_HELPER_INTERFACE_MODE_PICMG:
+ return "PICMG";
+ case CVMX_HELPER_INTERFACE_MODE_NPI:
+ return "NPI";
+ case CVMX_HELPER_INTERFACE_MODE_LOOP:
+ return "LOOP";
+ }
+ return "UNKNOWN";
+}
+
+/**
+ * Setup Random Early Drop on a specific input queue
+ *
+ * @queue: Input queue to setup RED on (0-7)
+ * @pass_thresh:
+ * Packets will begin slowly dropping when there are less than
+ * this many packet buffers free in FPA 0.
+ * @drop_thresh:
+ * All incoming packets will be dropped when there are less
+ * than this many free packet buffers in FPA 0.
+ * Returns Zero on success. Negative on failure
+ */
+static int cvmx_helper_setup_red_queue(int queue, int pass_thresh,
+ int drop_thresh)
+{
+ union cvmx_ipd_qosx_red_marks red_marks;
+ union cvmx_ipd_red_quex_param red_param;
+
+ /* Set RED to begin dropping packets when there are pass_thresh buffers
+ left. It will linearly drop more packets until reaching drop_thresh
+ buffers */
+ red_marks.u64 = 0;
+ red_marks.s.drop = drop_thresh;
+ red_marks.s.pass = pass_thresh;
+ cvmx_write_csr(CVMX_IPD_QOSX_RED_MARKS(queue), red_marks.u64);
+
+ /* Use the actual queue 0 counter, not the average */
+ red_param.u64 = 0;
+ red_param.s.prb_con =
+ (255ul << 24) / (red_marks.s.pass - red_marks.s.drop);
+ red_param.s.avg_con = 1;
+ red_param.s.new_con = 255;
+ red_param.s.use_pcnt = 1;
+ cvmx_write_csr(CVMX_IPD_RED_QUEX_PARAM(queue), red_param.u64);
+ return 0;
+}
+
+/**
+ * Setup Random Early Drop to automatically begin dropping packets.
+ *
+ * @pass_thresh:
+ * Packets will begin slowly dropping when there are less than
+ * this many packet buffers free in FPA 0.
+ * @drop_thresh:
+ * All incoming packets will be dropped when there are less
+ * than this many free packet buffers in FPA 0.
+ * Returns Zero on success. Negative on failure
+ */
+int cvmx_helper_setup_red(int pass_thresh, int drop_thresh)
+{
+ union cvmx_ipd_portx_bp_page_cnt page_cnt;
+ union cvmx_ipd_bp_prt_red_end ipd_bp_prt_red_end;
+ union cvmx_ipd_red_port_enable red_port_enable;
+ int queue;
+ int interface;
+ int port;
+
+ /* Disable backpressure based on queued buffers. It needs SW support */
+ page_cnt.u64 = 0;
+ page_cnt.s.bp_enb = 0;
+ page_cnt.s.page_cnt = 100;
+ for (interface = 0; interface < 2; interface++) {
+ for (port = cvmx_helper_get_first_ipd_port(interface);
+ port < cvmx_helper_get_last_ipd_port(interface); port++)
+ cvmx_write_csr(CVMX_IPD_PORTX_BP_PAGE_CNT(port),
+ page_cnt.u64);
+ }
+
+ for (queue = 0; queue < 8; queue++)
+ cvmx_helper_setup_red_queue(queue, pass_thresh, drop_thresh);
+
+ /* Shutoff the dropping based on the per port page count. SW isn't
+ decrementing it right now */
+ ipd_bp_prt_red_end.u64 = 0;
+ ipd_bp_prt_red_end.s.prt_enb = 0;
+ cvmx_write_csr(CVMX_IPD_BP_PRT_RED_END, ipd_bp_prt_red_end.u64);
+
+ red_port_enable.u64 = 0;
+ red_port_enable.s.prt_enb = 0xfffffffffull;
+ red_port_enable.s.avg_dly = 10000;
+ red_port_enable.s.prb_dly = 10000;
+ cvmx_write_csr(CVMX_IPD_RED_PORT_ENABLE, red_port_enable.u64);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cvmx_helper_setup_red);
+
+/**
+ * Setup the common GMX settings that determine the number of
+ * ports. These setting apply to almost all configurations of all
+ * chips.
+ *
+ * @interface: Interface to configure
+ * @num_ports: Number of ports on the interface
+ *
+ * Returns Zero on success, negative on failure
+ */
+int __cvmx_helper_setup_gmx(int interface, int num_ports)
+{
+ union cvmx_gmxx_tx_prts gmx_tx_prts;
+ union cvmx_gmxx_rx_prts gmx_rx_prts;
+ union cvmx_pko_reg_gmx_port_mode pko_mode;
+ union cvmx_gmxx_txx_thresh gmx_tx_thresh;
+ int index;
+
+ /* Tell GMX the number of TX ports on this interface */
+ gmx_tx_prts.u64 = cvmx_read_csr(CVMX_GMXX_TX_PRTS(interface));
+ gmx_tx_prts.s.prts = num_ports;
+ cvmx_write_csr(CVMX_GMXX_TX_PRTS(interface), gmx_tx_prts.u64);
+
+ /* Tell GMX the number of RX ports on this interface. This only
+ ** applies to *GMII and XAUI ports */
+ if (cvmx_helper_interface_get_mode(interface) ==
+ CVMX_HELPER_INTERFACE_MODE_RGMII
+ || cvmx_helper_interface_get_mode(interface) ==
+ CVMX_HELPER_INTERFACE_MODE_SGMII
+ || cvmx_helper_interface_get_mode(interface) ==
+ CVMX_HELPER_INTERFACE_MODE_GMII
+ || cvmx_helper_interface_get_mode(interface) ==
+ CVMX_HELPER_INTERFACE_MODE_XAUI) {
+ if (num_ports > 4) {
+ cvmx_dprintf("__cvmx_helper_setup_gmx: Illegal "
+ "num_ports\n");
+ return -1;
+ }
+
+ gmx_rx_prts.u64 = cvmx_read_csr(CVMX_GMXX_RX_PRTS(interface));
+ gmx_rx_prts.s.prts = num_ports;
+ cvmx_write_csr(CVMX_GMXX_RX_PRTS(interface), gmx_rx_prts.u64);
+ }
+
+ /* Skip setting CVMX_PKO_REG_GMX_PORT_MODE on 30XX, 31XX, and 50XX */
+ if (!OCTEON_IS_MODEL(OCTEON_CN30XX) && !OCTEON_IS_MODEL(OCTEON_CN31XX)
+ && !OCTEON_IS_MODEL(OCTEON_CN50XX)) {
+ /* Tell PKO the number of ports on this interface */
+ pko_mode.u64 = cvmx_read_csr(CVMX_PKO_REG_GMX_PORT_MODE);
+ if (interface == 0) {
+ if (num_ports == 1)
+ pko_mode.s.mode0 = 4;
+ else if (num_ports == 2)
+ pko_mode.s.mode0 = 3;
+ else if (num_ports <= 4)
+ pko_mode.s.mode0 = 2;
+ else if (num_ports <= 8)
+ pko_mode.s.mode0 = 1;
+ else
+ pko_mode.s.mode0 = 0;
+ } else {
+ if (num_ports == 1)
+ pko_mode.s.mode1 = 4;
+ else if (num_ports == 2)
+ pko_mode.s.mode1 = 3;
+ else if (num_ports <= 4)
+ pko_mode.s.mode1 = 2;
+ else if (num_ports <= 8)
+ pko_mode.s.mode1 = 1;
+ else
+ pko_mode.s.mode1 = 0;
+ }
+ cvmx_write_csr(CVMX_PKO_REG_GMX_PORT_MODE, pko_mode.u64);
+ }
+
+ /*
+ * Set GMX to buffer as much data as possible before starting
+ * transmit. This reduces the chances that we have a TX under
+ * run due to memory contention. Any packet that fits entirely
+ * in the GMX FIFO can never have an under run regardless of
+ * memory load.
+ */
+ gmx_tx_thresh.u64 = cvmx_read_csr(CVMX_GMXX_TXX_THRESH(0, interface));
+ if (OCTEON_IS_MODEL(OCTEON_CN30XX) || OCTEON_IS_MODEL(OCTEON_CN31XX)
+ || OCTEON_IS_MODEL(OCTEON_CN50XX)) {
+ /* These chips have a fixed max threshold of 0x40 */
+ gmx_tx_thresh.s.cnt = 0x40;
+ } else {
+ /* Choose the max value for the number of ports */
+ if (num_ports <= 1)
+ gmx_tx_thresh.s.cnt = 0x100 / 1;
+ else if (num_ports == 2)
+ gmx_tx_thresh.s.cnt = 0x100 / 2;
+ else
+ gmx_tx_thresh.s.cnt = 0x100 / 4;
+ }
+ /*
+ * SPI and XAUI can have lots of ports but the GMX hardware
+ * only ever has a max of 4.
+ */
+ if (num_ports > 4)
+ num_ports = 4;
+ for (index = 0; index < num_ports; index++)
+ cvmx_write_csr(CVMX_GMXX_TXX_THRESH(index, interface),
+ gmx_tx_thresh.u64);
+
+ return 0;
+}
+
+/**
+ * Returns the IPD/PKO port number for a port on the given
+ * interface.
+ *
+ * @interface: Interface to use
+ * @port: Port on the interface
+ *
+ * Returns IPD/PKO port number
+ */
+int cvmx_helper_get_ipd_port(int interface, int port)
+{
+ switch (interface) {
+ case 0:
+ return port;
+ case 1:
+ return port + 16;
+ case 2:
+ return port + 32;
+ case 3:
+ return port + 36;
+ case 4:
+ return port + 40;
+ case 5:
+ return port + 44;
+ }
+ return -1;
+}
+EXPORT_SYMBOL_GPL(cvmx_helper_get_ipd_port);
+
+/**
+ * Returns the interface number for an IPD/PKO port number.
+ *
+ * @ipd_port: IPD/PKO port number
+ *
+ * Returns Interface number
+ */
+int cvmx_helper_get_interface_num(int ipd_port)
+{
+ if (ipd_port < 16)
+ return 0;
+ else if (ipd_port < 32)
+ return 1;
+ else if (ipd_port < 36)
+ return 2;
+ else if (ipd_port < 40)
+ return 3;
+ else if (ipd_port < 44)
+ return 4;
+ else if (ipd_port < 48)
+ return 5;
+ else
+ cvmx_dprintf("cvmx_helper_get_interface_num: Illegal IPD "
+ "port number\n");
+
+ return -1;
+}
+EXPORT_SYMBOL_GPL(cvmx_helper_get_interface_num);
+
+/**
+ * Returns the interface index number for an IPD/PKO port
+ * number.
+ *
+ * @ipd_port: IPD/PKO port number
+ *
+ * Returns Interface index number
+ */
+int cvmx_helper_get_interface_index_num(int ipd_port)
+{
+ if (ipd_port < 32)
+ return ipd_port & 15;
+ else if (ipd_port < 36)
+ return ipd_port & 3;
+ else if (ipd_port < 40)
+ return ipd_port & 3;
+ else if (ipd_port < 44)
+ return ipd_port & 3;
+ else if (ipd_port < 48)
+ return ipd_port & 3;
+ else
+ cvmx_dprintf("cvmx_helper_get_interface_index_num: "
+ "Illegal IPD port number\n");
+
+ return -1;
+}
+EXPORT_SYMBOL_GPL(cvmx_helper_get_interface_index_num);