| /***********************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); |
