arch/mips/cavium-octeon/executive/cvmx-helper-xaui.c

   1 /***********************license start***************
   2  * Author: Cavium Networks
   3  *
   4  * Contact: support@caviumnetworks.com
   5  * This file is part of the OCTEON SDK
   6  *
   7  * Copyright (c) 2003-2008 Cavium Networks
   8  *
   9  * This file is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License, Version 2, as
  11  * published by the Free Software Foundation.
  12  *
  13  * This file is distributed in the hope that it will be useful, but
  14  * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
  15  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
  16  * NONINFRINGEMENT.  See the GNU General Public License for more
  17  * details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this file; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  22  * or visit http://www.gnu.org/licenses/.
  23  *
  24  * This file may also be available under a different license from Cavium.
  25  * Contact Cavium Networks for more information
  26  ***********************license end**************************************/
  27
  28 /*
  29  * Functions for XAUI initialization, configuration,
  30  * and monitoring.
  31  *
  32  */
  33
  34 #include <asm/octeon/octeon.h>
  35
  36 #include <asm/octeon/cvmx-config.h>
  37
  38 #include <asm/octeon/cvmx-helper.h>
  39
  40 #include <asm/octeon/cvmx-pko-defs.h>
  41 #include <asm/octeon/cvmx-gmxx-defs.h>
  42 #include <asm/octeon/cvmx-pcsxx-defs.h>
  43
  44 void __cvmx_interrupt_gmxx_enable(int interface);
  45 void __cvmx_interrupt_pcsx_intx_en_reg_enable(int index, int block);
  46 void __cvmx_interrupt_pcsxx_int_en_reg_enable(int index);
  47
  48 int __cvmx_helper_xaui_enumerate(int interface)
  49 {
  50         union cvmx_gmxx_hg2_control gmx_hg2_control;
  51
  52         /* If HiGig2 is enabled return 16 ports, otherwise return 1 port */
  53         gmx_hg2_control.u64 = cvmx_read_csr(CVMX_GMXX_HG2_CONTROL(interface));
  54         if (gmx_hg2_control.s.hg2tx_en)
  55                 return 16;
  56         else
  57                 return 1;
  58 }
  59
  60 /**
  61  * Probe a XAUI interface and determine the number of ports
  62  * connected to it. The XAUI interface should still be down
  63  * after this call.
  64  *
  65  * @interface: Interface to probe
  66  *
  67  * Returns Number of ports on the interface. Zero to disable.
  68  */
  69 int __cvmx_helper_xaui_probe(int interface)
  70 {
  71         int i;
  72         union cvmx_gmxx_inf_mode mode;
  73
  74         /*
  75          * Due to errata GMX-700 on CN56XXp1.x and CN52XXp1.x, the
  76          * interface needs to be enabled before IPD otherwise per port
  77          * backpressure may not work properly.
  78          */
  79         mode.u64 = cvmx_read_csr(CVMX_GMXX_INF_MODE(interface));
  80         mode.s.en = 1;
  81         cvmx_write_csr(CVMX_GMXX_INF_MODE(interface), mode.u64);
  82
  83         __cvmx_helper_setup_gmx(interface, 1);
  84
  85         /*
  86          * Setup PKO to support 16 ports for HiGig2 virtual
  87          * ports. We're pointing all of the PKO packet ports for this
  88          * interface to the XAUI. This allows us to use HiGig2
  89          * backpressure per port.
  90          */
  91         for (i = 0; i < 16; i++) {
  92                 union cvmx_pko_mem_port_ptrs pko_mem_port_ptrs;
  93                 pko_mem_port_ptrs.u64 = 0;
  94                 /*
  95                  * We set each PKO port to have equal priority in a
  96                  * round robin fashion.
  97                  */
  98                 pko_mem_port_ptrs.s.static_p = 0;
  99                 pko_mem_port_ptrs.s.qos_mask = 0xff;
 100                 /* All PKO ports map to the same XAUI hardware port */
 101                 pko_mem_port_ptrs.s.eid = interface * 4;
 102                 pko_mem_port_ptrs.s.pid = interface * 16 + i;
 103                 cvmx_write_csr(CVMX_PKO_MEM_PORT_PTRS, pko_mem_port_ptrs.u64);
 104         }
 105         return __cvmx_helper_xaui_enumerate(interface);
 106 }
 107
 108 /**
 109  * Bringup and enable a XAUI interface. After this call packet
 110  * I/O should be fully functional. This is called with IPD
 111  * enabled but PKO disabled.
 112  *
 113  * @interface: Interface to bring up
 114  *
 115  * Returns Zero on success, negative on failure
 116  */
 117 int __cvmx_helper_xaui_enable(int interface)
 118 {
 119         union cvmx_gmxx_prtx_cfg gmx_cfg;
 120         union cvmx_pcsxx_control1_reg xauiCtl;
 121         union cvmx_pcsxx_misc_ctl_reg xauiMiscCtl;
 122         union cvmx_gmxx_tx_xaui_ctl gmxXauiTxCtl;
 123         union cvmx_gmxx_rxx_int_en gmx_rx_int_en;
 124         union cvmx_gmxx_tx_int_en gmx_tx_int_en;
 125         union cvmx_pcsxx_int_en_reg pcsx_int_en_reg;
 126
 127         /* Setup PKND */
 128         if (octeon_has_feature(OCTEON_FEATURE_PKND)) {
 129                 gmx_cfg.u64 = cvmx_read_csr(CVMX_GMXX_PRTX_CFG(0, interface));
 130                 gmx_cfg.s.pknd = cvmx_helper_get_ipd_port(interface, 0);
 131                 cvmx_write_csr(CVMX_GMXX_PRTX_CFG(0, interface), gmx_cfg.u64);
 132         }
 133
 134         /* (1) Interface has already been enabled. */
 135
 136         /* (2) Disable GMX. */
 137         xauiMiscCtl.u64 = cvmx_read_csr(CVMX_PCSXX_MISC_CTL_REG(interface));
 138         xauiMiscCtl.s.gmxeno = 1;
 139         cvmx_write_csr(CVMX_PCSXX_MISC_CTL_REG(interface), xauiMiscCtl.u64);
 140
 141         /* (3) Disable GMX and PCSX interrupts. */
 142         gmx_rx_int_en.u64 = cvmx_read_csr(CVMX_GMXX_RXX_INT_EN(0, interface));
 143         cvmx_write_csr(CVMX_GMXX_RXX_INT_EN(0, interface), 0x0);
 144         gmx_tx_int_en.u64 = cvmx_read_csr(CVMX_GMXX_TX_INT_EN(interface));
 145         cvmx_write_csr(CVMX_GMXX_TX_INT_EN(interface), 0x0);
 146         pcsx_int_en_reg.u64 = cvmx_read_csr(CVMX_PCSXX_INT_EN_REG(interface));
 147         cvmx_write_csr(CVMX_PCSXX_INT_EN_REG(interface), 0x0);
 148
 149         /* (4) Bring up the PCSX and GMX reconciliation layer. */
 150         /* (4)a Set polarity and lane swapping. */
 151         /* (4)b */
 152         gmxXauiTxCtl.u64 = cvmx_read_csr(CVMX_GMXX_TX_XAUI_CTL(interface));
 153         /* Enable better IFG packing and improves performance */
 154         gmxXauiTxCtl.s.dic_en = 1;
 155         gmxXauiTxCtl.s.uni_en = 0;
 156         cvmx_write_csr(CVMX_GMXX_TX_XAUI_CTL(interface), gmxXauiTxCtl.u64);
 157
 158         /* (4)c Aply reset sequence */
 159         xauiCtl.u64 = cvmx_read_csr(CVMX_PCSXX_CONTROL1_REG(interface));
 160         xauiCtl.s.lo_pwr = 0;
 161
 162         /* Issuing a reset here seems to hang some CN68XX chips. */
 163         if (!OCTEON_IS_MODEL(OCTEON_CN68XX_PASS1_X) &&
 164             !OCTEON_IS_MODEL(OCTEON_CN68XX_PASS2_X))
 165                 xauiCtl.s.reset = 1;
 166
 167         cvmx_write_csr(CVMX_PCSXX_CONTROL1_REG(interface), xauiCtl.u64);
 168
 169         /* Wait for PCS to come out of reset */
 170         if (CVMX_WAIT_FOR_FIELD64
 171             (CVMX_PCSXX_CONTROL1_REG(interface), union cvmx_pcsxx_control1_reg,
 172              reset, ==, 0, 10000))
 173                 return -1;
 174         /* Wait for PCS to be aligned */
 175         if (CVMX_WAIT_FOR_FIELD64
 176             (CVMX_PCSXX_10GBX_STATUS_REG(interface),
 177              union cvmx_pcsxx_10gbx_status_reg, alignd, ==, 1, 10000))
 178                 return -1;
 179         /* Wait for RX to be ready */
 180         if (CVMX_WAIT_FOR_FIELD64
 181             (CVMX_GMXX_RX_XAUI_CTL(interface), union cvmx_gmxx_rx_xaui_ctl,
 182                     status, ==, 0, 10000))
 183                 return -1;
 184
 185         /* (6) Configure GMX */
 186         gmx_cfg.u64 = cvmx_read_csr(CVMX_GMXX_PRTX_CFG(0, interface));
 187         gmx_cfg.s.en = 0;
 188         cvmx_write_csr(CVMX_GMXX_PRTX_CFG(0, interface), gmx_cfg.u64);
 189
 190         /* Wait for GMX RX to be idle */
 191         if (CVMX_WAIT_FOR_FIELD64
 192             (CVMX_GMXX_PRTX_CFG(0, interface), union cvmx_gmxx_prtx_cfg,
 193                     rx_idle, ==, 1, 10000))
 194                 return -1;
 195         /* Wait for GMX TX to be idle */
 196         if (CVMX_WAIT_FOR_FIELD64
 197             (CVMX_GMXX_PRTX_CFG(0, interface), union cvmx_gmxx_prtx_cfg,
 198                     tx_idle, ==, 1, 10000))
 199                 return -1;
 200
 201         /* GMX configure */
 202         gmx_cfg.u64 = cvmx_read_csr(CVMX_GMXX_PRTX_CFG(0, interface));
 203         gmx_cfg.s.speed = 1;
 204         gmx_cfg.s.speed_msb = 0;
 205         gmx_cfg.s.slottime = 1;
 206         cvmx_write_csr(CVMX_GMXX_TX_PRTS(interface), 1);
 207         cvmx_write_csr(CVMX_GMXX_TXX_SLOT(0, interface), 512);
 208         cvmx_write_csr(CVMX_GMXX_TXX_BURST(0, interface), 8192);
 209         cvmx_write_csr(CVMX_GMXX_PRTX_CFG(0, interface), gmx_cfg.u64);
 210
 211         /* (7) Clear out any error state */
 212         cvmx_write_csr(CVMX_GMXX_RXX_INT_REG(0, interface),
 213                        cvmx_read_csr(CVMX_GMXX_RXX_INT_REG(0, interface)));
 214         cvmx_write_csr(CVMX_GMXX_TX_INT_REG(interface),
 215                        cvmx_read_csr(CVMX_GMXX_TX_INT_REG(interface)));
 216         cvmx_write_csr(CVMX_PCSXX_INT_REG(interface),
 217                        cvmx_read_csr(CVMX_PCSXX_INT_REG(interface)));
 218
 219         /* Wait for receive link */
 220         if (CVMX_WAIT_FOR_FIELD64
 221             (CVMX_PCSXX_STATUS1_REG(interface), union cvmx_pcsxx_status1_reg,
 222              rcv_lnk, ==, 1, 10000))
 223                 return -1;
 224         if (CVMX_WAIT_FOR_FIELD64
 225             (CVMX_PCSXX_STATUS2_REG(interface), union cvmx_pcsxx_status2_reg,
 226              xmtflt, ==, 0, 10000))
 227                 return -1;
 228         if (CVMX_WAIT_FOR_FIELD64
 229             (CVMX_PCSXX_STATUS2_REG(interface), union cvmx_pcsxx_status2_reg,
 230              rcvflt, ==, 0, 10000))
 231                 return -1;
 232
 233         cvmx_write_csr(CVMX_GMXX_RXX_INT_EN(0, interface), gmx_rx_int_en.u64);
 234         cvmx_write_csr(CVMX_GMXX_TX_INT_EN(interface), gmx_tx_int_en.u64);
 235         cvmx_write_csr(CVMX_PCSXX_INT_EN_REG(interface), pcsx_int_en_reg.u64);
 236
 237         cvmx_helper_link_autoconf(cvmx_helper_get_ipd_port(interface, 0));
 238
 239         /* (8) Enable packet reception */
 240         xauiMiscCtl.s.gmxeno = 0;
 241         cvmx_write_csr(CVMX_PCSXX_MISC_CTL_REG(interface), xauiMiscCtl.u64);
 242
 243         gmx_cfg.u64 = cvmx_read_csr(CVMX_GMXX_PRTX_CFG(0, interface));
 244         gmx_cfg.s.en = 1;
 245         cvmx_write_csr(CVMX_GMXX_PRTX_CFG(0, interface), gmx_cfg.u64);
 246
 247         __cvmx_interrupt_pcsx_intx_en_reg_enable(0, interface);
 248         __cvmx_interrupt_pcsx_intx_en_reg_enable(1, interface);
 249         __cvmx_interrupt_pcsx_intx_en_reg_enable(2, interface);
 250         __cvmx_interrupt_pcsx_intx_en_reg_enable(3, interface);
 251         __cvmx_interrupt_pcsxx_int_en_reg_enable(interface);
 252         __cvmx_interrupt_gmxx_enable(interface);
 253
 254         return 0;
 255 }
 256
 257 /**
 258  * Return the link state of an IPD/PKO port as returned by
 259  * auto negotiation. The result of this function may not match
 260  * Octeon's link config if auto negotiation has changed since
 261  * the last call to cvmx_helper_link_set().
 262  *
 263  * @ipd_port: IPD/PKO port to query
 264  *
 265  * Returns Link state
 266  */
 267 cvmx_helper_link_info_t __cvmx_helper_xaui_link_get(int ipd_port)
 268 {
 269         int interface = cvmx_helper_get_interface_num(ipd_port);
 270         union cvmx_gmxx_tx_xaui_ctl gmxx_tx_xaui_ctl;
 271         union cvmx_gmxx_rx_xaui_ctl gmxx_rx_xaui_ctl;
 272         union cvmx_pcsxx_status1_reg pcsxx_status1_reg;
 273         cvmx_helper_link_info_t result;
 274
 275         gmxx_tx_xaui_ctl.u64 = cvmx_read_csr(CVMX_GMXX_TX_XAUI_CTL(interface));
 276         gmxx_rx_xaui_ctl.u64 = cvmx_read_csr(CVMX_GMXX_RX_XAUI_CTL(interface));
 277         pcsxx_status1_reg.u64 =
 278             cvmx_read_csr(CVMX_PCSXX_STATUS1_REG(interface));
 279         result.u64 = 0;
 280
 281         /* Only return a link if both RX and TX are happy */
 282         if ((gmxx_tx_xaui_ctl.s.ls == 0) && (gmxx_rx_xaui_ctl.s.status == 0) &&
 283             (pcsxx_status1_reg.s.rcv_lnk == 1)) {
 284                 result.s.link_up = 1;
 285                 result.s.full_duplex = 1;
 286                 result.s.speed = 10000;
 287         } else {
 288                 /* Disable GMX and PCSX interrupts. */
 289                 cvmx_write_csr(CVMX_GMXX_RXX_INT_EN(0, interface), 0x0);
 290                 cvmx_write_csr(CVMX_GMXX_TX_INT_EN(interface), 0x0);
 291                 cvmx_write_csr(CVMX_PCSXX_INT_EN_REG(interface), 0x0);
 292         }
 293         return result;
 294 }
 295
 296 /**
 297  * Configure an IPD/PKO port for the specified link state. This
 298  * function does not influence auto negotiation at the PHY level.
 299  * The passed link state must always match the link state returned
 300  * by cvmx_helper_link_get(). It is normally best to use
 301  * cvmx_helper_link_autoconf() instead.
 302  *
 303  * @ipd_port:  IPD/PKO port to configure
 304  * @link_info: The new link state
 305  *
 306  * Returns Zero on success, negative on failure
 307  */
 308 int __cvmx_helper_xaui_link_set(int ipd_port, cvmx_helper_link_info_t link_info)
 309 {
 310         int interface = cvmx_helper_get_interface_num(ipd_port);
 311         union cvmx_gmxx_tx_xaui_ctl gmxx_tx_xaui_ctl;
 312         union cvmx_gmxx_rx_xaui_ctl gmxx_rx_xaui_ctl;
 313
 314         gmxx_tx_xaui_ctl.u64 = cvmx_read_csr(CVMX_GMXX_TX_XAUI_CTL(interface));
 315         gmxx_rx_xaui_ctl.u64 = cvmx_read_csr(CVMX_GMXX_RX_XAUI_CTL(interface));
 316
 317         /* If the link shouldn't be up, then just return */
 318         if (!link_info.s.link_up)
 319                 return 0;
 320
 321         /* Do nothing if both RX and TX are happy */
 322         if ((gmxx_tx_xaui_ctl.s.ls == 0) && (gmxx_rx_xaui_ctl.s.status == 0))
 323                 return 0;
 324
 325         /* Bring the link up */
 326         return __cvmx_helper_xaui_enable(interface);
 327 }
 328
 329 /**
 330  * Configure a port for internal and/or external loopback. Internal loopback
 331  * causes packets sent by the port to be received by Octeon. External loopback
 332  * causes packets received from the wire to sent out again.
 333  *
 334  * @ipd_port: IPD/PKO port to loopback.
 335  * @enable_internal:
 336  *                 Non zero if you want internal loopback
 337  * @enable_external:
 338  *                 Non zero if you want external loopback
 339  *
 340  * Returns Zero on success, negative on failure.
 341  */
 342 extern int __cvmx_helper_xaui_configure_loopback(int ipd_port,
 343                                                  int enable_internal,
 344                                                  int enable_external)
 345 {
 346         int interface = cvmx_helper_get_interface_num(ipd_port);
 347         union cvmx_pcsxx_control1_reg pcsxx_control1_reg;
 348         union cvmx_gmxx_xaui_ext_loopback gmxx_xaui_ext_loopback;
 349
 350         /* Set the internal loop */
 351         pcsxx_control1_reg.u64 =
 352             cvmx_read_csr(CVMX_PCSXX_CONTROL1_REG(interface));
 353         pcsxx_control1_reg.s.loopbck1 = enable_internal;
 354         cvmx_write_csr(CVMX_PCSXX_CONTROL1_REG(interface),
 355                        pcsxx_control1_reg.u64);
 356
 357         /* Set the external loop */
 358         gmxx_xaui_ext_loopback.u64 =
 359             cvmx_read_csr(CVMX_GMXX_XAUI_EXT_LOOPBACK(interface));
 360         gmxx_xaui_ext_loopback.s.en = enable_external;
 361         cvmx_write_csr(CVMX_GMXX_XAUI_EXT_LOOPBACK(interface),
 362                        gmxx_xaui_ext_loopback.u64);
 363
 364         /* Take the link through a reset */
 365         return __cvmx_helper_xaui_enable(interface);
 366 }