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