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Diffstat (limited to '')
| -rw-r--r-- | arch/mips/cavium-octeon/executive/cvmx-helper-util.c | 363 |
1 files changed, 363 insertions, 0 deletions
diff --git a/arch/mips/cavium-octeon/executive/cvmx-helper-util.c b/arch/mips/cavium-octeon/executive/cvmx-helper-util.c new file mode 100644 index 000000000..53b912745 --- /dev/null +++ b/arch/mips/cavium-octeon/executive/cvmx-helper-util.c @@ -0,0 +1,363 @@ +/***********************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); |