arch/mips/cavium-octeon/executive/cvmx-spi.c

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This source file includes following definitions.
cvmx_spi_get_callbacks
cvmx_spi_set_callbacks
cvmx_spi_start_interface
cvmx_spi_restart_interface
cvmx_spi_reset_cb
cvmx_spi_calendar_setup_cb
cvmx_spi_clock_detect_cb
cvmx_spi_training_cb
cvmx_spi_calendar_sync_cb
cvmx_spi_interface_up_cb
   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  *
  30  * Support library for the SPI
  31  */
  32 #include <asm/octeon/octeon.h>
  33 
  34 #include <asm/octeon/cvmx-config.h>
  35 
  36 #include <asm/octeon/cvmx-pko.h>
  37 #include <asm/octeon/cvmx-spi.h>
  38 
  39 #include <asm/octeon/cvmx-spxx-defs.h>
  40 #include <asm/octeon/cvmx-stxx-defs.h>
  41 #include <asm/octeon/cvmx-srxx-defs.h>
  42 
  43 #define INVOKE_CB(function_p, args...)          \
  44         do {                                    \
  45                 if (function_p) {               \
  46                         res = function_p(args); \
  47                         if (res)                \
  48                                 return res;     \
  49                 }                               \
  50         } while (0)
  51 
  52 #if CVMX_ENABLE_DEBUG_PRINTS
  53 static const char *modes[] =
  54     { "UNKNOWN", "TX Halfplex", "Rx Halfplex", "Duplex" };
  55 #endif
  56 
  57 /* Default callbacks, can be overridden
  58  *  using cvmx_spi_get_callbacks/cvmx_spi_set_callbacks
  59  */
  60 static cvmx_spi_callbacks_t cvmx_spi_callbacks = {
  61         .reset_cb = cvmx_spi_reset_cb,
  62         .calendar_setup_cb = cvmx_spi_calendar_setup_cb,
  63         .clock_detect_cb = cvmx_spi_clock_detect_cb,
  64         .training_cb = cvmx_spi_training_cb,
  65         .calendar_sync_cb = cvmx_spi_calendar_sync_cb,
  66         .interface_up_cb = cvmx_spi_interface_up_cb
  67 };
  68 
  69 /**
  70  * Get current SPI4 initialization callbacks
  71  *
  72  * @callbacks:  Pointer to the callbacks structure.to fill
  73  *
  74  * Returns Pointer to cvmx_spi_callbacks_t structure.
  75  */
  76 void cvmx_spi_get_callbacks(cvmx_spi_callbacks_t *callbacks)
  77 {
  78         memcpy(callbacks, &cvmx_spi_callbacks, sizeof(cvmx_spi_callbacks));
  79 }
  80 
  81 /**
  82  * Set new SPI4 initialization callbacks
  83  *
  84  * @new_callbacks:  Pointer to an updated callbacks structure.
  85  */
  86 void cvmx_spi_set_callbacks(cvmx_spi_callbacks_t *new_callbacks)
  87 {
  88         memcpy(&cvmx_spi_callbacks, new_callbacks, sizeof(cvmx_spi_callbacks));
  89 }
  90 
  91 /**
  92  * Initialize and start the SPI interface.
  93  *
  94  * @interface: The identifier of the packet interface to configure and
  95  *                  use as a SPI interface.
  96  * @mode:      The operating mode for the SPI interface. The interface
  97  *                  can operate as a full duplex (both Tx and Rx data paths
  98  *                  active) or as a halfplex (either the Tx data path is
  99  *                  active or the Rx data path is active, but not both).
 100  * @timeout:   Timeout to wait for clock synchronization in seconds
 101  * @num_ports: Number of SPI ports to configure
 102  *
 103  * Returns Zero on success, negative of failure.
 104  */
 105 int cvmx_spi_start_interface(int interface, cvmx_spi_mode_t mode, int timeout,
 106                              int num_ports)
 107 {
 108         int res = -1;
 109 
 110         if (!(OCTEON_IS_MODEL(OCTEON_CN38XX) || OCTEON_IS_MODEL(OCTEON_CN58XX)))
 111                 return res;
 112 
 113         /* Callback to perform SPI4 reset */
 114         INVOKE_CB(cvmx_spi_callbacks.reset_cb, interface, mode);
 115 
 116         /* Callback to perform calendar setup */
 117         INVOKE_CB(cvmx_spi_callbacks.calendar_setup_cb, interface, mode,
 118                   num_ports);
 119 
 120         /* Callback to perform clock detection */
 121         INVOKE_CB(cvmx_spi_callbacks.clock_detect_cb, interface, mode, timeout);
 122 
 123         /* Callback to perform SPI4 link training */
 124         INVOKE_CB(cvmx_spi_callbacks.training_cb, interface, mode, timeout);
 125 
 126         /* Callback to perform calendar sync */
 127         INVOKE_CB(cvmx_spi_callbacks.calendar_sync_cb, interface, mode,
 128                   timeout);
 129 
 130         /* Callback to handle interface coming up */
 131         INVOKE_CB(cvmx_spi_callbacks.interface_up_cb, interface, mode);
 132 
 133         return res;
 134 }
 135 
 136 /**
 137  * This routine restarts the SPI interface after it has lost synchronization
 138  * with its correspondent system.
 139  *
 140  * @interface: The identifier of the packet interface to configure and
 141  *                  use as a SPI interface.
 142  * @mode:      The operating mode for the SPI interface. The interface
 143  *                  can operate as a full duplex (both Tx and Rx data paths
 144  *                  active) or as a halfplex (either the Tx data path is
 145  *                  active or the Rx data path is active, but not both).
 146  * @timeout:   Timeout to wait for clock synchronization in seconds
 147  *
 148  * Returns Zero on success, negative of failure.
 149  */
 150 int cvmx_spi_restart_interface(int interface, cvmx_spi_mode_t mode, int timeout)
 151 {
 152         int res = -1;
 153 
 154         if (!(OCTEON_IS_MODEL(OCTEON_CN38XX) || OCTEON_IS_MODEL(OCTEON_CN58XX)))
 155                 return res;
 156 
 157         cvmx_dprintf("SPI%d: Restart %s\n", interface, modes[mode]);
 158 
 159         /* Callback to perform SPI4 reset */
 160         INVOKE_CB(cvmx_spi_callbacks.reset_cb, interface, mode);
 161 
 162         /* NOTE: Calendar setup is not performed during restart */
 163         /*       Refer to cvmx_spi_start_interface() for the full sequence */
 164 
 165         /* Callback to perform clock detection */
 166         INVOKE_CB(cvmx_spi_callbacks.clock_detect_cb, interface, mode, timeout);
 167 
 168         /* Callback to perform SPI4 link training */
 169         INVOKE_CB(cvmx_spi_callbacks.training_cb, interface, mode, timeout);
 170 
 171         /* Callback to perform calendar sync */
 172         INVOKE_CB(cvmx_spi_callbacks.calendar_sync_cb, interface, mode,
 173                   timeout);
 174 
 175         /* Callback to handle interface coming up */
 176         INVOKE_CB(cvmx_spi_callbacks.interface_up_cb, interface, mode);
 177 
 178         return res;
 179 }
 180 EXPORT_SYMBOL_GPL(cvmx_spi_restart_interface);
 181 
 182 /**
 183  * Callback to perform SPI4 reset
 184  *
 185  * @interface: The identifier of the packet interface to configure and
 186  *                  use as a SPI interface.
 187  * @mode:      The operating mode for the SPI interface. The interface
 188  *                  can operate as a full duplex (both Tx and Rx data paths
 189  *                  active) or as a halfplex (either the Tx data path is
 190  *                  active or the Rx data path is active, but not both).
 191  *
 192  * Returns Zero on success, non-zero error code on failure (will cause
 193  * SPI initialization to abort)
 194  */
 195 int cvmx_spi_reset_cb(int interface, cvmx_spi_mode_t mode)
 196 {
 197         union cvmx_spxx_dbg_deskew_ctl spxx_dbg_deskew_ctl;
 198         union cvmx_spxx_clk_ctl spxx_clk_ctl;
 199         union cvmx_spxx_bist_stat spxx_bist_stat;
 200         union cvmx_spxx_int_msk spxx_int_msk;
 201         union cvmx_stxx_int_msk stxx_int_msk;
 202         union cvmx_spxx_trn4_ctl spxx_trn4_ctl;
 203         int index;
 204         uint64_t MS = cvmx_sysinfo_get()->cpu_clock_hz / 1000;
 205 
 206         /* Disable SPI error events while we run BIST */
 207         spxx_int_msk.u64 = cvmx_read_csr(CVMX_SPXX_INT_MSK(interface));
 208         cvmx_write_csr(CVMX_SPXX_INT_MSK(interface), 0);
 209         stxx_int_msk.u64 = cvmx_read_csr(CVMX_STXX_INT_MSK(interface));
 210         cvmx_write_csr(CVMX_STXX_INT_MSK(interface), 0);
 211 
 212         /* Run BIST in the SPI interface */
 213         cvmx_write_csr(CVMX_SRXX_COM_CTL(interface), 0);
 214         cvmx_write_csr(CVMX_STXX_COM_CTL(interface), 0);
 215         spxx_clk_ctl.u64 = 0;
 216         spxx_clk_ctl.s.runbist = 1;
 217         cvmx_write_csr(CVMX_SPXX_CLK_CTL(interface), spxx_clk_ctl.u64);
 218         __delay(10 * MS);
 219         spxx_bist_stat.u64 = cvmx_read_csr(CVMX_SPXX_BIST_STAT(interface));
 220         if (spxx_bist_stat.s.stat0)
 221                 cvmx_dprintf
 222                     ("ERROR SPI%d: BIST failed on receive datapath FIFO\n",
 223                      interface);
 224         if (spxx_bist_stat.s.stat1)
 225                 cvmx_dprintf("ERROR SPI%d: BIST failed on RX calendar table\n",
 226                              interface);
 227         if (spxx_bist_stat.s.stat2)
 228                 cvmx_dprintf("ERROR SPI%d: BIST failed on TX calendar table\n",
 229                              interface);
 230 
 231         /* Clear the calendar table after BIST to fix parity errors */
 232         for (index = 0; index < 32; index++) {
 233                 union cvmx_srxx_spi4_calx srxx_spi4_calx;
 234                 union cvmx_stxx_spi4_calx stxx_spi4_calx;
 235 
 236                 srxx_spi4_calx.u64 = 0;
 237                 srxx_spi4_calx.s.oddpar = 1;
 238                 cvmx_write_csr(CVMX_SRXX_SPI4_CALX(index, interface),
 239                                srxx_spi4_calx.u64);
 240 
 241                 stxx_spi4_calx.u64 = 0;
 242                 stxx_spi4_calx.s.oddpar = 1;
 243                 cvmx_write_csr(CVMX_STXX_SPI4_CALX(index, interface),
 244                                stxx_spi4_calx.u64);
 245         }
 246 
 247         /* Re enable reporting of error interrupts */
 248         cvmx_write_csr(CVMX_SPXX_INT_REG(interface),
 249                        cvmx_read_csr(CVMX_SPXX_INT_REG(interface)));
 250         cvmx_write_csr(CVMX_SPXX_INT_MSK(interface), spxx_int_msk.u64);
 251         cvmx_write_csr(CVMX_STXX_INT_REG(interface),
 252                        cvmx_read_csr(CVMX_STXX_INT_REG(interface)));
 253         cvmx_write_csr(CVMX_STXX_INT_MSK(interface), stxx_int_msk.u64);
 254 
 255         /* Setup the CLKDLY right in the middle */
 256         spxx_clk_ctl.u64 = 0;
 257         spxx_clk_ctl.s.seetrn = 0;
 258         spxx_clk_ctl.s.clkdly = 0x10;
 259         spxx_clk_ctl.s.runbist = 0;
 260         spxx_clk_ctl.s.statdrv = 0;
 261         /* This should always be on the opposite edge as statdrv */
 262         spxx_clk_ctl.s.statrcv = 1;
 263         spxx_clk_ctl.s.sndtrn = 0;
 264         spxx_clk_ctl.s.drptrn = 0;
 265         spxx_clk_ctl.s.rcvtrn = 0;
 266         spxx_clk_ctl.s.srxdlck = 0;
 267         cvmx_write_csr(CVMX_SPXX_CLK_CTL(interface), spxx_clk_ctl.u64);
 268         __delay(100 * MS);
 269 
 270         /* Reset SRX0 DLL */
 271         spxx_clk_ctl.s.srxdlck = 1;
 272         cvmx_write_csr(CVMX_SPXX_CLK_CTL(interface), spxx_clk_ctl.u64);
 273 
 274         /* Waiting for Inf0 Spi4 RX DLL to lock */
 275         __delay(100 * MS);
 276 
 277         /* Enable dynamic alignment */
 278         spxx_trn4_ctl.s.trntest = 0;
 279         spxx_trn4_ctl.s.jitter = 1;
 280         spxx_trn4_ctl.s.clr_boot = 1;
 281         spxx_trn4_ctl.s.set_boot = 0;
 282         if (OCTEON_IS_MODEL(OCTEON_CN58XX))
 283                 spxx_trn4_ctl.s.maxdist = 3;
 284         else
 285                 spxx_trn4_ctl.s.maxdist = 8;
 286         spxx_trn4_ctl.s.macro_en = 1;
 287         spxx_trn4_ctl.s.mux_en = 1;
 288         cvmx_write_csr(CVMX_SPXX_TRN4_CTL(interface), spxx_trn4_ctl.u64);
 289 
 290         spxx_dbg_deskew_ctl.u64 = 0;
 291         cvmx_write_csr(CVMX_SPXX_DBG_DESKEW_CTL(interface),
 292                        spxx_dbg_deskew_ctl.u64);
 293 
 294         return 0;
 295 }
 296 
 297 /**
 298  * Callback to setup calendar and miscellaneous settings before clock detection
 299  *
 300  * @interface: The identifier of the packet interface to configure and
 301  *                  use as a SPI interface.
 302  * @mode:      The operating mode for the SPI interface. The interface
 303  *                  can operate as a full duplex (both Tx and Rx data paths
 304  *                  active) or as a halfplex (either the Tx data path is
 305  *                  active or the Rx data path is active, but not both).
 306  * @num_ports: Number of ports to configure on SPI
 307  *
 308  * Returns Zero on success, non-zero error code on failure (will cause
 309  * SPI initialization to abort)
 310  */
 311 int cvmx_spi_calendar_setup_cb(int interface, cvmx_spi_mode_t mode,
 312                                int num_ports)
 313 {
 314         int port;
 315         int index;
 316         if (mode & CVMX_SPI_MODE_RX_HALFPLEX) {
 317                 union cvmx_srxx_com_ctl srxx_com_ctl;
 318                 union cvmx_srxx_spi4_stat srxx_spi4_stat;
 319 
 320                 /* SRX0 number of Ports */
 321                 srxx_com_ctl.u64 = 0;
 322                 srxx_com_ctl.s.prts = num_ports - 1;
 323                 srxx_com_ctl.s.st_en = 0;
 324                 srxx_com_ctl.s.inf_en = 0;
 325                 cvmx_write_csr(CVMX_SRXX_COM_CTL(interface), srxx_com_ctl.u64);
 326 
 327                 /* SRX0 Calendar Table. This round robbins through all ports */
 328                 port = 0;
 329                 index = 0;
 330                 while (port < num_ports) {
 331                         union cvmx_srxx_spi4_calx srxx_spi4_calx;
 332                         srxx_spi4_calx.u64 = 0;
 333                         srxx_spi4_calx.s.prt0 = port++;
 334                         srxx_spi4_calx.s.prt1 = port++;
 335                         srxx_spi4_calx.s.prt2 = port++;
 336                         srxx_spi4_calx.s.prt3 = port++;
 337                         srxx_spi4_calx.s.oddpar =
 338                             ~(cvmx_dpop(srxx_spi4_calx.u64) & 1);
 339                         cvmx_write_csr(CVMX_SRXX_SPI4_CALX(index, interface),
 340                                        srxx_spi4_calx.u64);
 341                         index++;
 342                 }
 343                 srxx_spi4_stat.u64 = 0;
 344                 srxx_spi4_stat.s.len = num_ports;
 345                 srxx_spi4_stat.s.m = 1;
 346                 cvmx_write_csr(CVMX_SRXX_SPI4_STAT(interface),
 347                                srxx_spi4_stat.u64);
 348         }
 349 
 350         if (mode & CVMX_SPI_MODE_TX_HALFPLEX) {
 351                 union cvmx_stxx_arb_ctl stxx_arb_ctl;
 352                 union cvmx_gmxx_tx_spi_max gmxx_tx_spi_max;
 353                 union cvmx_gmxx_tx_spi_thresh gmxx_tx_spi_thresh;
 354                 union cvmx_gmxx_tx_spi_ctl gmxx_tx_spi_ctl;
 355                 union cvmx_stxx_spi4_stat stxx_spi4_stat;
 356                 union cvmx_stxx_spi4_dat stxx_spi4_dat;
 357 
 358                 /* STX0 Config */
 359                 stxx_arb_ctl.u64 = 0;
 360                 stxx_arb_ctl.s.igntpa = 0;
 361                 stxx_arb_ctl.s.mintrn = 0;
 362                 cvmx_write_csr(CVMX_STXX_ARB_CTL(interface), stxx_arb_ctl.u64);
 363 
 364                 gmxx_tx_spi_max.u64 = 0;
 365                 gmxx_tx_spi_max.s.max1 = 8;
 366                 gmxx_tx_spi_max.s.max2 = 4;
 367                 gmxx_tx_spi_max.s.slice = 0;
 368                 cvmx_write_csr(CVMX_GMXX_TX_SPI_MAX(interface),
 369                                gmxx_tx_spi_max.u64);
 370 
 371                 gmxx_tx_spi_thresh.u64 = 0;
 372                 gmxx_tx_spi_thresh.s.thresh = 4;
 373                 cvmx_write_csr(CVMX_GMXX_TX_SPI_THRESH(interface),
 374                                gmxx_tx_spi_thresh.u64);
 375 
 376                 gmxx_tx_spi_ctl.u64 = 0;
 377                 gmxx_tx_spi_ctl.s.tpa_clr = 0;
 378                 gmxx_tx_spi_ctl.s.cont_pkt = 0;
 379                 cvmx_write_csr(CVMX_GMXX_TX_SPI_CTL(interface),
 380                                gmxx_tx_spi_ctl.u64);
 381 
 382                 /* STX0 Training Control */
 383                 stxx_spi4_dat.u64 = 0;
 384                 /*Minimum needed by dynamic alignment */
 385                 stxx_spi4_dat.s.alpha = 32;
 386                 stxx_spi4_dat.s.max_t = 0xFFFF; /*Minimum interval is 0x20 */
 387                 cvmx_write_csr(CVMX_STXX_SPI4_DAT(interface),
 388                                stxx_spi4_dat.u64);
 389 
 390                 /* STX0 Calendar Table. This round robbins through all ports */
 391                 port = 0;
 392                 index = 0;
 393                 while (port < num_ports) {
 394                         union cvmx_stxx_spi4_calx stxx_spi4_calx;
 395                         stxx_spi4_calx.u64 = 0;
 396                         stxx_spi4_calx.s.prt0 = port++;
 397                         stxx_spi4_calx.s.prt1 = port++;
 398                         stxx_spi4_calx.s.prt2 = port++;
 399                         stxx_spi4_calx.s.prt3 = port++;
 400                         stxx_spi4_calx.s.oddpar =
 401                             ~(cvmx_dpop(stxx_spi4_calx.u64) & 1);
 402                         cvmx_write_csr(CVMX_STXX_SPI4_CALX(index, interface),
 403                                        stxx_spi4_calx.u64);
 404                         index++;
 405                 }
 406                 stxx_spi4_stat.u64 = 0;
 407                 stxx_spi4_stat.s.len = num_ports;
 408                 stxx_spi4_stat.s.m = 1;
 409                 cvmx_write_csr(CVMX_STXX_SPI4_STAT(interface),
 410                                stxx_spi4_stat.u64);
 411         }
 412 
 413         return 0;
 414 }
 415 
 416 /**
 417  * Callback to perform clock detection
 418  *
 419  * @interface: The identifier of the packet interface to configure and
 420  *                  use as a SPI interface.
 421  * @mode:      The operating mode for the SPI interface. The interface
 422  *                  can operate as a full duplex (both Tx and Rx data paths
 423  *                  active) or as a halfplex (either the Tx data path is
 424  *                  active or the Rx data path is active, but not both).
 425  * @timeout:   Timeout to wait for clock synchronization in seconds
 426  *
 427  * Returns Zero on success, non-zero error code on failure (will cause
 428  * SPI initialization to abort)
 429  */
 430 int cvmx_spi_clock_detect_cb(int interface, cvmx_spi_mode_t mode, int timeout)
 431 {
 432         int clock_transitions;
 433         union cvmx_spxx_clk_stat stat;
 434         uint64_t timeout_time;
 435         uint64_t MS = cvmx_sysinfo_get()->cpu_clock_hz / 1000;
 436 
 437         /*
 438          * Regardless of operating mode, both Tx and Rx clocks must be
 439          * present for the SPI interface to operate.
 440          */
 441         cvmx_dprintf("SPI%d: Waiting to see TsClk...\n", interface);
 442         timeout_time = cvmx_get_cycle() + 1000ull * MS * timeout;
 443         /*
 444          * Require 100 clock transitions in order to avoid any noise
 445          * in the beginning.
 446          */
 447         clock_transitions = 100;
 448         do {
 449                 stat.u64 = cvmx_read_csr(CVMX_SPXX_CLK_STAT(interface));
 450                 if (stat.s.s4clk0 && stat.s.s4clk1 && clock_transitions) {
 451                         /*
 452                          * We've seen a clock transition, so decrement
 453                          * the number we still need.
 454                          */
 455                         clock_transitions--;
 456                         cvmx_write_csr(CVMX_SPXX_CLK_STAT(interface), stat.u64);
 457                         stat.s.s4clk0 = 0;
 458                         stat.s.s4clk1 = 0;
 459                 }
 460                 if (cvmx_get_cycle() > timeout_time) {
 461                         cvmx_dprintf("SPI%d: Timeout\n", interface);
 462                         return -1;
 463                 }
 464         } while (stat.s.s4clk0 == 0 || stat.s.s4clk1 == 0);
 465 
 466         cvmx_dprintf("SPI%d: Waiting to see RsClk...\n", interface);
 467         timeout_time = cvmx_get_cycle() + 1000ull * MS * timeout;
 468         /*
 469          * Require 100 clock transitions in order to avoid any noise in the
 470          * beginning.
 471          */
 472         clock_transitions = 100;
 473         do {
 474                 stat.u64 = cvmx_read_csr(CVMX_SPXX_CLK_STAT(interface));
 475                 if (stat.s.d4clk0 && stat.s.d4clk1 && clock_transitions) {
 476                         /*
 477                          * We've seen a clock transition, so decrement
 478                          * the number we still need
 479                          */
 480                         clock_transitions--;
 481                         cvmx_write_csr(CVMX_SPXX_CLK_STAT(interface), stat.u64);
 482                         stat.s.d4clk0 = 0;
 483                         stat.s.d4clk1 = 0;
 484                 }
 485                 if (cvmx_get_cycle() > timeout_time) {
 486                         cvmx_dprintf("SPI%d: Timeout\n", interface);
 487                         return -1;
 488                 }
 489         } while (stat.s.d4clk0 == 0 || stat.s.d4clk1 == 0);
 490 
 491         return 0;
 492 }
 493 
 494 /**
 495  * Callback to perform link training
 496  *
 497  * @interface: The identifier of the packet interface to configure and
 498  *                  use as a SPI interface.
 499  * @mode:      The operating mode for the SPI interface. The interface
 500  *                  can operate as a full duplex (both Tx and Rx data paths
 501  *                  active) or as a halfplex (either the Tx data path is
 502  *                  active or the Rx data path is active, but not both).
 503  * @timeout:   Timeout to wait for link to be trained (in seconds)
 504  *
 505  * Returns Zero on success, non-zero error code on failure (will cause
 506  * SPI initialization to abort)
 507  */
 508 int cvmx_spi_training_cb(int interface, cvmx_spi_mode_t mode, int timeout)
 509 {
 510         union cvmx_spxx_trn4_ctl spxx_trn4_ctl;
 511         union cvmx_spxx_clk_stat stat;
 512         uint64_t MS = cvmx_sysinfo_get()->cpu_clock_hz / 1000;
 513         uint64_t timeout_time = cvmx_get_cycle() + 1000ull * MS * timeout;
 514         int rx_training_needed;
 515 
 516         /* SRX0 & STX0 Inf0 Links are configured - begin training */
 517         union cvmx_spxx_clk_ctl spxx_clk_ctl;
 518         spxx_clk_ctl.u64 = 0;
 519         spxx_clk_ctl.s.seetrn = 0;
 520         spxx_clk_ctl.s.clkdly = 0x10;
 521         spxx_clk_ctl.s.runbist = 0;
 522         spxx_clk_ctl.s.statdrv = 0;
 523         /* This should always be on the opposite edge as statdrv */
 524         spxx_clk_ctl.s.statrcv = 1;
 525         spxx_clk_ctl.s.sndtrn = 1;
 526         spxx_clk_ctl.s.drptrn = 1;
 527         spxx_clk_ctl.s.rcvtrn = 1;
 528         spxx_clk_ctl.s.srxdlck = 1;
 529         cvmx_write_csr(CVMX_SPXX_CLK_CTL(interface), spxx_clk_ctl.u64);
 530         __delay(1000 * MS);
 531 
 532         /* SRX0 clear the boot bit */
 533         spxx_trn4_ctl.u64 = cvmx_read_csr(CVMX_SPXX_TRN4_CTL(interface));
 534         spxx_trn4_ctl.s.clr_boot = 1;
 535         cvmx_write_csr(CVMX_SPXX_TRN4_CTL(interface), spxx_trn4_ctl.u64);
 536 
 537         /* Wait for the training sequence to complete */
 538         cvmx_dprintf("SPI%d: Waiting for training\n", interface);
 539         __delay(1000 * MS);
 540         /* Wait a really long time here */
 541         timeout_time = cvmx_get_cycle() + 1000ull * MS * 600;
 542         /*
 543          * The HRM says we must wait for 34 + 16 * MAXDIST training sequences.
 544          * We'll be pessimistic and wait for a lot more.
 545          */
 546         rx_training_needed = 500;
 547         do {
 548                 stat.u64 = cvmx_read_csr(CVMX_SPXX_CLK_STAT(interface));
 549                 if (stat.s.srxtrn && rx_training_needed) {
 550                         rx_training_needed--;
 551                         cvmx_write_csr(CVMX_SPXX_CLK_STAT(interface), stat.u64);
 552                         stat.s.srxtrn = 0;
 553                 }
 554                 if (cvmx_get_cycle() > timeout_time) {
 555                         cvmx_dprintf("SPI%d: Timeout\n", interface);
 556                         return -1;
 557                 }
 558         } while (stat.s.srxtrn == 0);
 559 
 560         return 0;
 561 }
 562 
 563 /**
 564  * Callback to perform calendar data synchronization
 565  *
 566  * @interface: The identifier of the packet interface to configure and
 567  *                  use as a SPI interface.
 568  * @mode:      The operating mode for the SPI interface. The interface
 569  *                  can operate as a full duplex (both Tx and Rx data paths
 570  *                  active) or as a halfplex (either the Tx data path is
 571  *                  active or the Rx data path is active, but not both).
 572  * @timeout:   Timeout to wait for calendar data in seconds
 573  *
 574  * Returns Zero on success, non-zero error code on failure (will cause
 575  * SPI initialization to abort)
 576  */
 577 int cvmx_spi_calendar_sync_cb(int interface, cvmx_spi_mode_t mode, int timeout)
 578 {
 579         uint64_t MS = cvmx_sysinfo_get()->cpu_clock_hz / 1000;
 580         if (mode & CVMX_SPI_MODE_RX_HALFPLEX) {
 581                 /* SRX0 interface should be good, send calendar data */
 582                 union cvmx_srxx_com_ctl srxx_com_ctl;
 583                 cvmx_dprintf
 584                     ("SPI%d: Rx is synchronized, start sending calendar data\n",
 585                      interface);
 586                 srxx_com_ctl.u64 = cvmx_read_csr(CVMX_SRXX_COM_CTL(interface));
 587                 srxx_com_ctl.s.inf_en = 1;
 588                 srxx_com_ctl.s.st_en = 1;
 589                 cvmx_write_csr(CVMX_SRXX_COM_CTL(interface), srxx_com_ctl.u64);
 590         }
 591 
 592         if (mode & CVMX_SPI_MODE_TX_HALFPLEX) {
 593                 /* STX0 has achieved sync */
 594                 /* The corespondant board should be sending calendar data */
 595                 /* Enable the STX0 STAT receiver. */
 596                 union cvmx_spxx_clk_stat stat;
 597                 uint64_t timeout_time;
 598                 union cvmx_stxx_com_ctl stxx_com_ctl;
 599                 stxx_com_ctl.u64 = 0;
 600                 stxx_com_ctl.s.st_en = 1;
 601                 cvmx_write_csr(CVMX_STXX_COM_CTL(interface), stxx_com_ctl.u64);
 602 
 603                 /* Waiting for calendar sync on STX0 STAT */
 604                 cvmx_dprintf("SPI%d: Waiting to sync on STX[%d] STAT\n",
 605                              interface, interface);
 606                 timeout_time = cvmx_get_cycle() + 1000ull * MS * timeout;
 607                 /* SPX0_CLK_STAT - SPX0_CLK_STAT[STXCAL] should be 1 (bit10) */
 608                 do {
 609                         stat.u64 = cvmx_read_csr(CVMX_SPXX_CLK_STAT(interface));
 610                         if (cvmx_get_cycle() > timeout_time) {
 611                                 cvmx_dprintf("SPI%d: Timeout\n", interface);
 612                                 return -1;
 613                         }
 614                 } while (stat.s.stxcal == 0);
 615         }
 616 
 617         return 0;
 618 }
 619 
 620 /**
 621  * Callback to handle interface up
 622  *
 623  * @interface: The identifier of the packet interface to configure and
 624  *                  use as a SPI interface.
 625  * @mode:      The operating mode for the SPI interface. The interface
 626  *                  can operate as a full duplex (both Tx and Rx data paths
 627  *                  active) or as a halfplex (either the Tx data path is
 628  *                  active or the Rx data path is active, but not both).
 629  *
 630  * Returns Zero on success, non-zero error code on failure (will cause
 631  * SPI initialization to abort)
 632  */
 633 int cvmx_spi_interface_up_cb(int interface, cvmx_spi_mode_t mode)
 634 {
 635         union cvmx_gmxx_rxx_frm_min gmxx_rxx_frm_min;
 636         union cvmx_gmxx_rxx_frm_max gmxx_rxx_frm_max;
 637         union cvmx_gmxx_rxx_jabber gmxx_rxx_jabber;
 638 
 639         if (mode & CVMX_SPI_MODE_RX_HALFPLEX) {
 640                 union cvmx_srxx_com_ctl srxx_com_ctl;
 641                 srxx_com_ctl.u64 = cvmx_read_csr(CVMX_SRXX_COM_CTL(interface));
 642                 srxx_com_ctl.s.inf_en = 1;
 643                 cvmx_write_csr(CVMX_SRXX_COM_CTL(interface), srxx_com_ctl.u64);
 644                 cvmx_dprintf("SPI%d: Rx is now up\n", interface);
 645         }
 646 
 647         if (mode & CVMX_SPI_MODE_TX_HALFPLEX) {
 648                 union cvmx_stxx_com_ctl stxx_com_ctl;
 649                 stxx_com_ctl.u64 = cvmx_read_csr(CVMX_STXX_COM_CTL(interface));
 650                 stxx_com_ctl.s.inf_en = 1;
 651                 cvmx_write_csr(CVMX_STXX_COM_CTL(interface), stxx_com_ctl.u64);
 652                 cvmx_dprintf("SPI%d: Tx is now up\n", interface);
 653         }
 654 
 655         gmxx_rxx_frm_min.u64 = 0;
 656         gmxx_rxx_frm_min.s.len = 64;
 657         cvmx_write_csr(CVMX_GMXX_RXX_FRM_MIN(0, interface),
 658                        gmxx_rxx_frm_min.u64);
 659         gmxx_rxx_frm_max.u64 = 0;
 660         gmxx_rxx_frm_max.s.len = 64 * 1024 - 4;
 661         cvmx_write_csr(CVMX_GMXX_RXX_FRM_MAX(0, interface),
 662                        gmxx_rxx_frm_max.u64);
 663         gmxx_rxx_jabber.u64 = 0;
 664         gmxx_rxx_jabber.s.cnt = 64 * 1024 - 4;
 665         cvmx_write_csr(CVMX_GMXX_RXX_JABBER(0, interface), gmxx_rxx_jabber.u64);
 666 
 667         return 0;
 668 }
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root/arch/mips/cavium-octeon/executive/cvmx-spi.c

DEFINITIONS
