drivers/infiniband/hw/ipath/ipath_iba6120.c

   1 /*
   2  * Copyright (c) 2006 QLogic, Inc. All rights reserved.
   3  * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33 /*
  34  * This file contains all of the code that is specific to the
  35  * InfiniPath PCIe chip.
  36  */
  37
  38 #include <linux/interrupt.h>
  39 #include <linux/pci.h>
  40 #include <linux/delay.h>
  41
  42
  43 #include "ipath_kernel.h"
  44 #include "ipath_registers.h"
  45
  46 static void ipath_setup_pe_setextled(struct ipath_devdata *, u64, u64);
  47
  48 /*
  49  * This file contains all the chip-specific register information and
  50  * access functions for the QLogic InfiniPath PCI-Express chip.
  51  *
  52  * This lists the InfiniPath registers, in the actual chip layout.
  53  * This structure should never be directly accessed.
  54  */
  55 struct _infinipath_do_not_use_kernel_regs {
  56         unsigned long long Revision;
  57         unsigned long long Control;
  58         unsigned long long PageAlign;
  59         unsigned long long PortCnt;
  60         unsigned long long DebugPortSelect;
  61         unsigned long long Reserved0;
  62         unsigned long long SendRegBase;
  63         unsigned long long UserRegBase;
  64         unsigned long long CounterRegBase;
  65         unsigned long long Scratch;
  66         unsigned long long Reserved1;
  67         unsigned long long Reserved2;
  68         unsigned long long IntBlocked;
  69         unsigned long long IntMask;
  70         unsigned long long IntStatus;
  71         unsigned long long IntClear;
  72         unsigned long long ErrorMask;
  73         unsigned long long ErrorStatus;
  74         unsigned long long ErrorClear;
  75         unsigned long long HwErrMask;
  76         unsigned long long HwErrStatus;
  77         unsigned long long HwErrClear;
  78         unsigned long long HwDiagCtrl;
  79         unsigned long long MDIO;
  80         unsigned long long IBCStatus;
  81         unsigned long long IBCCtrl;
  82         unsigned long long ExtStatus;
  83         unsigned long long ExtCtrl;
  84         unsigned long long GPIOOut;
  85         unsigned long long GPIOMask;
  86         unsigned long long GPIOStatus;
  87         unsigned long long GPIOClear;
  88         unsigned long long RcvCtrl;
  89         unsigned long long RcvBTHQP;
  90         unsigned long long RcvHdrSize;
  91         unsigned long long RcvHdrCnt;
  92         unsigned long long RcvHdrEntSize;
  93         unsigned long long RcvTIDBase;
  94         unsigned long long RcvTIDCnt;
  95         unsigned long long RcvEgrBase;
  96         unsigned long long RcvEgrCnt;
  97         unsigned long long RcvBufBase;
  98         unsigned long long RcvBufSize;
  99         unsigned long long RxIntMemBase;
 100         unsigned long long RxIntMemSize;
 101         unsigned long long RcvPartitionKey;
 102         unsigned long long Reserved3;
 103         unsigned long long RcvPktLEDCnt;
 104         unsigned long long Reserved4[8];
 105         unsigned long long SendCtrl;
 106         unsigned long long SendPIOBufBase;
 107         unsigned long long SendPIOSize;
 108         unsigned long long SendPIOBufCnt;
 109         unsigned long long SendPIOAvailAddr;
 110         unsigned long long TxIntMemBase;
 111         unsigned long long TxIntMemSize;
 112         unsigned long long Reserved5;
 113         unsigned long long PCIeRBufTestReg0;
 114         unsigned long long PCIeRBufTestReg1;
 115         unsigned long long Reserved51[6];
 116         unsigned long long SendBufferError;
 117         unsigned long long SendBufferErrorCONT1;
 118         unsigned long long Reserved6SBE[6];
 119         unsigned long long RcvHdrAddr0;
 120         unsigned long long RcvHdrAddr1;
 121         unsigned long long RcvHdrAddr2;
 122         unsigned long long RcvHdrAddr3;
 123         unsigned long long RcvHdrAddr4;
 124         unsigned long long Reserved7RHA[11];
 125         unsigned long long RcvHdrTailAddr0;
 126         unsigned long long RcvHdrTailAddr1;
 127         unsigned long long RcvHdrTailAddr2;
 128         unsigned long long RcvHdrTailAddr3;
 129         unsigned long long RcvHdrTailAddr4;
 130         unsigned long long Reserved8RHTA[11];
 131         unsigned long long Reserved9SW[8];
 132         unsigned long long SerdesConfig0;
 133         unsigned long long SerdesConfig1;
 134         unsigned long long SerdesStatus;
 135         unsigned long long XGXSConfig;
 136         unsigned long long IBPLLCfg;
 137         unsigned long long Reserved10SW2[3];
 138         unsigned long long PCIEQ0SerdesConfig0;
 139         unsigned long long PCIEQ0SerdesConfig1;
 140         unsigned long long PCIEQ0SerdesStatus;
 141         unsigned long long Reserved11;
 142         unsigned long long PCIEQ1SerdesConfig0;
 143         unsigned long long PCIEQ1SerdesConfig1;
 144         unsigned long long PCIEQ1SerdesStatus;
 145         unsigned long long Reserved12;
 146 };
 147
 148 #define IPATH_KREG_OFFSET(field) (offsetof(struct \
 149     _infinipath_do_not_use_kernel_regs, field) / sizeof(u64))
 150 #define IPATH_CREG_OFFSET(field) (offsetof( \
 151     struct infinipath_counters, field) / sizeof(u64))
 152
 153 static const struct ipath_kregs ipath_pe_kregs = {
 154         .kr_control = IPATH_KREG_OFFSET(Control),
 155         .kr_counterregbase = IPATH_KREG_OFFSET(CounterRegBase),
 156         .kr_debugportselect = IPATH_KREG_OFFSET(DebugPortSelect),
 157         .kr_errorclear = IPATH_KREG_OFFSET(ErrorClear),
 158         .kr_errormask = IPATH_KREG_OFFSET(ErrorMask),
 159         .kr_errorstatus = IPATH_KREG_OFFSET(ErrorStatus),
 160         .kr_extctrl = IPATH_KREG_OFFSET(ExtCtrl),
 161         .kr_extstatus = IPATH_KREG_OFFSET(ExtStatus),
 162         .kr_gpio_clear = IPATH_KREG_OFFSET(GPIOClear),
 163         .kr_gpio_mask = IPATH_KREG_OFFSET(GPIOMask),
 164         .kr_gpio_out = IPATH_KREG_OFFSET(GPIOOut),
 165         .kr_gpio_status = IPATH_KREG_OFFSET(GPIOStatus),
 166         .kr_hwdiagctrl = IPATH_KREG_OFFSET(HwDiagCtrl),
 167         .kr_hwerrclear = IPATH_KREG_OFFSET(HwErrClear),
 168         .kr_hwerrmask = IPATH_KREG_OFFSET(HwErrMask),
 169         .kr_hwerrstatus = IPATH_KREG_OFFSET(HwErrStatus),
 170         .kr_ibcctrl = IPATH_KREG_OFFSET(IBCCtrl),
 171         .kr_ibcstatus = IPATH_KREG_OFFSET(IBCStatus),
 172         .kr_intblocked = IPATH_KREG_OFFSET(IntBlocked),
 173         .kr_intclear = IPATH_KREG_OFFSET(IntClear),
 174         .kr_intmask = IPATH_KREG_OFFSET(IntMask),
 175         .kr_intstatus = IPATH_KREG_OFFSET(IntStatus),
 176         .kr_mdio = IPATH_KREG_OFFSET(MDIO),
 177         .kr_pagealign = IPATH_KREG_OFFSET(PageAlign),
 178         .kr_partitionkey = IPATH_KREG_OFFSET(RcvPartitionKey),
 179         .kr_portcnt = IPATH_KREG_OFFSET(PortCnt),
 180         .kr_rcvbthqp = IPATH_KREG_OFFSET(RcvBTHQP),
 181         .kr_rcvbufbase = IPATH_KREG_OFFSET(RcvBufBase),
 182         .kr_rcvbufsize = IPATH_KREG_OFFSET(RcvBufSize),
 183         .kr_rcvctrl = IPATH_KREG_OFFSET(RcvCtrl),
 184         .kr_rcvegrbase = IPATH_KREG_OFFSET(RcvEgrBase),
 185         .kr_rcvegrcnt = IPATH_KREG_OFFSET(RcvEgrCnt),
 186         .kr_rcvhdrcnt = IPATH_KREG_OFFSET(RcvHdrCnt),
 187         .kr_rcvhdrentsize = IPATH_KREG_OFFSET(RcvHdrEntSize),
 188         .kr_rcvhdrsize = IPATH_KREG_OFFSET(RcvHdrSize),
 189         .kr_rcvintmembase = IPATH_KREG_OFFSET(RxIntMemBase),
 190         .kr_rcvintmemsize = IPATH_KREG_OFFSET(RxIntMemSize),
 191         .kr_rcvtidbase = IPATH_KREG_OFFSET(RcvTIDBase),
 192         .kr_rcvtidcnt = IPATH_KREG_OFFSET(RcvTIDCnt),
 193         .kr_revision = IPATH_KREG_OFFSET(Revision),
 194         .kr_scratch = IPATH_KREG_OFFSET(Scratch),
 195         .kr_sendbuffererror = IPATH_KREG_OFFSET(SendBufferError),
 196         .kr_sendctrl = IPATH_KREG_OFFSET(SendCtrl),
 197         .kr_sendpioavailaddr = IPATH_KREG_OFFSET(SendPIOAvailAddr),
 198         .kr_sendpiobufbase = IPATH_KREG_OFFSET(SendPIOBufBase),
 199         .kr_sendpiobufcnt = IPATH_KREG_OFFSET(SendPIOBufCnt),
 200         .kr_sendpiosize = IPATH_KREG_OFFSET(SendPIOSize),
 201         .kr_sendregbase = IPATH_KREG_OFFSET(SendRegBase),
 202         .kr_txintmembase = IPATH_KREG_OFFSET(TxIntMemBase),
 203         .kr_txintmemsize = IPATH_KREG_OFFSET(TxIntMemSize),
 204         .kr_userregbase = IPATH_KREG_OFFSET(UserRegBase),
 205         .kr_serdesconfig0 = IPATH_KREG_OFFSET(SerdesConfig0),
 206         .kr_serdesconfig1 = IPATH_KREG_OFFSET(SerdesConfig1),
 207         .kr_serdesstatus = IPATH_KREG_OFFSET(SerdesStatus),
 208         .kr_xgxsconfig = IPATH_KREG_OFFSET(XGXSConfig),
 209         .kr_ibpllcfg = IPATH_KREG_OFFSET(IBPLLCfg),
 210
 211         /*
 212          * These should not be used directly via ipath_write_kreg64(),
 213          * use them with ipath_write_kreg64_port(),
 214          */
 215         .kr_rcvhdraddr = IPATH_KREG_OFFSET(RcvHdrAddr0),
 216         .kr_rcvhdrtailaddr = IPATH_KREG_OFFSET(RcvHdrTailAddr0),
 217
 218         /* The rcvpktled register controls one of the debug port signals, so
 219          * a packet activity LED can be connected to it. */
 220         .kr_rcvpktledcnt = IPATH_KREG_OFFSET(RcvPktLEDCnt),
 221         .kr_pcierbuftestreg0 = IPATH_KREG_OFFSET(PCIeRBufTestReg0),
 222         .kr_pcierbuftestreg1 = IPATH_KREG_OFFSET(PCIeRBufTestReg1),
 223         .kr_pcieq0serdesconfig0 = IPATH_KREG_OFFSET(PCIEQ0SerdesConfig0),
 224         .kr_pcieq0serdesconfig1 = IPATH_KREG_OFFSET(PCIEQ0SerdesConfig1),
 225         .kr_pcieq0serdesstatus = IPATH_KREG_OFFSET(PCIEQ0SerdesStatus),
 226         .kr_pcieq1serdesconfig0 = IPATH_KREG_OFFSET(PCIEQ1SerdesConfig0),
 227         .kr_pcieq1serdesconfig1 = IPATH_KREG_OFFSET(PCIEQ1SerdesConfig1),
 228         .kr_pcieq1serdesstatus = IPATH_KREG_OFFSET(PCIEQ1SerdesStatus)
 229 };
 230
 231 static const struct ipath_cregs ipath_pe_cregs = {
 232         .cr_badformatcnt = IPATH_CREG_OFFSET(RxBadFormatCnt),
 233         .cr_erricrccnt = IPATH_CREG_OFFSET(RxICRCErrCnt),
 234         .cr_errlinkcnt = IPATH_CREG_OFFSET(RxLinkProblemCnt),
 235         .cr_errlpcrccnt = IPATH_CREG_OFFSET(RxLPCRCErrCnt),
 236         .cr_errpkey = IPATH_CREG_OFFSET(RxPKeyMismatchCnt),
 237         .cr_errrcvflowctrlcnt = IPATH_CREG_OFFSET(RxFlowCtrlErrCnt),
 238         .cr_err_rlencnt = IPATH_CREG_OFFSET(RxLenErrCnt),
 239         .cr_errslencnt = IPATH_CREG_OFFSET(TxLenErrCnt),
 240         .cr_errtidfull = IPATH_CREG_OFFSET(RxTIDFullErrCnt),
 241         .cr_errtidvalid = IPATH_CREG_OFFSET(RxTIDValidErrCnt),
 242         .cr_errvcrccnt = IPATH_CREG_OFFSET(RxVCRCErrCnt),
 243         .cr_ibstatuschange = IPATH_CREG_OFFSET(IBStatusChangeCnt),
 244         .cr_intcnt = IPATH_CREG_OFFSET(LBIntCnt),
 245         .cr_invalidrlencnt = IPATH_CREG_OFFSET(RxMaxMinLenErrCnt),
 246         .cr_invalidslencnt = IPATH_CREG_OFFSET(TxMaxMinLenErrCnt),
 247         .cr_lbflowstallcnt = IPATH_CREG_OFFSET(LBFlowStallCnt),
 248         .cr_pktrcvcnt = IPATH_CREG_OFFSET(RxDataPktCnt),
 249         .cr_pktrcvflowctrlcnt = IPATH_CREG_OFFSET(RxFlowPktCnt),
 250         .cr_pktsendcnt = IPATH_CREG_OFFSET(TxDataPktCnt),
 251         .cr_pktsendflowcnt = IPATH_CREG_OFFSET(TxFlowPktCnt),
 252         .cr_portovflcnt = IPATH_CREG_OFFSET(RxP0HdrEgrOvflCnt),
 253         .cr_rcvebpcnt = IPATH_CREG_OFFSET(RxEBPCnt),
 254         .cr_rcvovflcnt = IPATH_CREG_OFFSET(RxBufOvflCnt),
 255         .cr_senddropped = IPATH_CREG_OFFSET(TxDroppedPktCnt),
 256         .cr_sendstallcnt = IPATH_CREG_OFFSET(TxFlowStallCnt),
 257         .cr_sendunderruncnt = IPATH_CREG_OFFSET(TxUnderrunCnt),
 258         .cr_wordrcvcnt = IPATH_CREG_OFFSET(RxDwordCnt),
 259         .cr_wordsendcnt = IPATH_CREG_OFFSET(TxDwordCnt),
 260         .cr_unsupvlcnt = IPATH_CREG_OFFSET(TxUnsupVLErrCnt),
 261         .cr_rxdroppktcnt = IPATH_CREG_OFFSET(RxDroppedPktCnt),
 262         .cr_iblinkerrrecovcnt = IPATH_CREG_OFFSET(IBLinkErrRecoveryCnt),
 263         .cr_iblinkdowncnt = IPATH_CREG_OFFSET(IBLinkDownedCnt),
 264         .cr_ibsymbolerrcnt = IPATH_CREG_OFFSET(IBSymbolErrCnt)
 265 };
 266
 267 /* kr_intstatus, kr_intclear, kr_intmask bits */
 268 #define INFINIPATH_I_RCVURG_MASK ((1U<<5)-1)
 269 #define INFINIPATH_I_RCVAVAIL_MASK ((1U<<5)-1)
 270
 271 /* kr_hwerrclear, kr_hwerrmask, kr_hwerrstatus, bits */
 272 #define INFINIPATH_HWE_PCIEMEMPARITYERR_MASK  0x000000000000003fULL
 273 #define INFINIPATH_HWE_PCIEMEMPARITYERR_SHIFT 0
 274 #define INFINIPATH_HWE_PCIEPOISONEDTLP      0x0000000010000000ULL
 275 #define INFINIPATH_HWE_PCIECPLTIMEOUT       0x0000000020000000ULL
 276 #define INFINIPATH_HWE_PCIEBUSPARITYXTLH    0x0000000040000000ULL
 277 #define INFINIPATH_HWE_PCIEBUSPARITYXADM    0x0000000080000000ULL
 278 #define INFINIPATH_HWE_PCIEBUSPARITYRADM    0x0000000100000000ULL
 279 #define INFINIPATH_HWE_COREPLL_FBSLIP       0x0080000000000000ULL
 280 #define INFINIPATH_HWE_COREPLL_RFSLIP       0x0100000000000000ULL
 281 #define INFINIPATH_HWE_PCIE1PLLFAILED       0x0400000000000000ULL
 282 #define INFINIPATH_HWE_PCIE0PLLFAILED       0x0800000000000000ULL
 283 #define INFINIPATH_HWE_SERDESPLLFAILED      0x1000000000000000ULL
 284
 285 /* kr_extstatus bits */
 286 #define INFINIPATH_EXTS_FREQSEL 0x2
 287 #define INFINIPATH_EXTS_SERDESSEL 0x4
 288 #define INFINIPATH_EXTS_MEMBIST_ENDTEST     0x0000000000004000
 289 #define INFINIPATH_EXTS_MEMBIST_FOUND       0x0000000000008000
 290
 291 #define _IPATH_GPIO_SDA_NUM 1
 292 #define _IPATH_GPIO_SCL_NUM 0
 293
 294 #define IPATH_GPIO_SDA (1ULL << \
 295         (_IPATH_GPIO_SDA_NUM+INFINIPATH_EXTC_GPIOOE_SHIFT))
 296 #define IPATH_GPIO_SCL (1ULL << \
 297         (_IPATH_GPIO_SCL_NUM+INFINIPATH_EXTC_GPIOOE_SHIFT))
 298
 299 /*
 300  * Rev2 silicon allows suppressing check for ArmLaunch errors.
 301  * this can speed up short packet sends on systems that do
 302  * not guaranteee write-order.
 303  */
 304 #define INFINIPATH_XGXS_SUPPRESS_ARMLAUNCH_ERR (1ULL<<63)
 305
 306 /* 6120 specific hardware errors... */
 307 static const struct ipath_hwerror_msgs ipath_6120_hwerror_msgs[] = {
 308         INFINIPATH_HWE_MSG(PCIEPOISONEDTLP, "PCIe Poisoned TLP"),
 309         INFINIPATH_HWE_MSG(PCIECPLTIMEOUT, "PCIe completion timeout"),
 310         /*
 311          * In practice, it's unlikely wthat we'll see PCIe PLL, or bus
 312          * parity or memory parity error failures, because most likely we
 313          * won't be able to talk to the core of the chip.  Nonetheless, we
 314          * might see them, if they are in parts of the PCIe core that aren't
 315          * essential.
 316          */
 317         INFINIPATH_HWE_MSG(PCIE1PLLFAILED, "PCIePLL1"),
 318         INFINIPATH_HWE_MSG(PCIE0PLLFAILED, "PCIePLL0"),
 319         INFINIPATH_HWE_MSG(PCIEBUSPARITYXTLH, "PCIe XTLH core parity"),
 320         INFINIPATH_HWE_MSG(PCIEBUSPARITYXADM, "PCIe ADM TX core parity"),
 321         INFINIPATH_HWE_MSG(PCIEBUSPARITYRADM, "PCIe ADM RX core parity"),
 322         INFINIPATH_HWE_MSG(RXDSYNCMEMPARITYERR, "Rx Dsync"),
 323         INFINIPATH_HWE_MSG(SERDESPLLFAILED, "SerDes PLL"),
 324 };
 325
 326 #define TXE_PIO_PARITY ((INFINIPATH_HWE_TXEMEMPARITYERR_PIOBUF | \
 327                         INFINIPATH_HWE_TXEMEMPARITYERR_PIOPBC) \
 328                         << INFINIPATH_HWE_TXEMEMPARITYERR_SHIFT)
 329
 330 static int ipath_pe_txe_recover(struct ipath_devdata *);
 331
 332 /**
 333  * ipath_pe_handle_hwerrors - display hardware errors.
 334  * @dd: the infinipath device
 335  * @msg: the output buffer
 336  * @msgl: the size of the output buffer
 337  *
 338  * Use same msg buffer as regular errors to avoid excessive stack
 339  * use.  Most hardware errors are catastrophic, but for right now,
 340  * we'll print them and continue.  We reuse the same message buffer as
 341  * ipath_handle_errors() to avoid excessive stack usage.
 342  */
 343 static void ipath_pe_handle_hwerrors(struct ipath_devdata *dd, char *msg,
 344                                      size_t msgl)
 345 {
 346         ipath_err_t hwerrs;
 347         u32 bits, ctrl;
 348         int isfatal = 0;
 349         char bitsmsg[64];
 350
 351         hwerrs = ipath_read_kreg64(dd, dd->ipath_kregs->kr_hwerrstatus);
 352         if (!hwerrs) {
 353                 /*
 354                  * better than printing cofusing messages
 355                  * This seems to be related to clearing the crc error, or
 356                  * the pll error during init.
 357                  */
 358                 ipath_cdbg(VERBOSE, "Called but no hardware errors set\n");
 359                 return;
 360         } else if (hwerrs == ~0ULL) {
 361                 ipath_dev_err(dd, "Read of hardware error status failed "
 362                               "(all bits set); ignoring\n");
 363                 return;
 364         }
 365         ipath_stats.sps_hwerrs++;
 366
 367         /* Always clear the error status register, except MEMBISTFAIL,
 368          * regardless of whether we continue or stop using the chip.
 369          * We want that set so we know it failed, even across driver reload.
 370          * We'll still ignore it in the hwerrmask.  We do this partly for
 371          * diagnostics, but also for support */
 372         ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrclear,
 373                          hwerrs&~INFINIPATH_HWE_MEMBISTFAILED);
 374
 375         hwerrs &= dd->ipath_hwerrmask;
 376
 377         /*
 378          * make sure we get this much out, unless told to be quiet,
 379          * or it's occurred within the last 5 seconds
 380          */
 381         if ((hwerrs & ~(dd->ipath_lasthwerror |
 382                         ((INFINIPATH_HWE_TXEMEMPARITYERR_PIOBUF |
 383                           INFINIPATH_HWE_TXEMEMPARITYERR_PIOPBC)
 384                          << INFINIPATH_HWE_TXEMEMPARITYERR_SHIFT))) ||
 385             (ipath_debug & __IPATH_VERBDBG))
 386                 dev_info(&dd->pcidev->dev, "Hardware error: hwerr=0x%llx "
 387                          "(cleared)\n", (unsigned long long) hwerrs);
 388         dd->ipath_lasthwerror |= hwerrs;
 389
 390         if (hwerrs & ~dd->ipath_hwe_bitsextant)
 391                 ipath_dev_err(dd, "hwerror interrupt with unknown errors "
 392                               "%llx set\n", (unsigned long long)
 393                               (hwerrs & ~dd->ipath_hwe_bitsextant));
 394
 395         ctrl = ipath_read_kreg32(dd, dd->ipath_kregs->kr_control);
 396         if (ctrl & INFINIPATH_C_FREEZEMODE) {
 397                 /*
 398                  * parity errors in send memory are recoverable,
 399                  * just cancel the send (if indicated in * sendbuffererror),
 400                  * count the occurrence, unfreeze (if no other handled
 401                  * hardware error bits are set), and continue. They can
 402                  * occur if a processor speculative read is done to the PIO
 403                  * buffer while we are sending a packet, for example.
 404                  */
 405                 if ((hwerrs & TXE_PIO_PARITY) && ipath_pe_txe_recover(dd))
 406                         hwerrs &= ~TXE_PIO_PARITY;
 407                 if (hwerrs) {
 408                         /*
 409                          * if any set that we aren't ignoring only make the
 410                          * complaint once, in case it's stuck or recurring,
 411                          * and we get here multiple times
 412                          * Force link down, so switch knows, and
 413                          * LEDs are turned off
 414                          */
 415                         if (dd->ipath_flags & IPATH_INITTED) {
 416                                 ipath_set_linkstate(dd, IPATH_IB_LINKDOWN);
 417                                 ipath_setup_pe_setextled(dd,
 418                                         INFINIPATH_IBCS_L_STATE_DOWN,
 419                                         INFINIPATH_IBCS_LT_STATE_DISABLED);
 420                                 ipath_dev_err(dd, "Fatal Hardware Error (freeze "
 421                                               "mode), no longer usable, SN %.16s\n",
 422                                                   dd->ipath_serial);
 423                                 isfatal = 1;
 424                         }
 425                         /*
 426                          * Mark as having had an error for driver, and also
 427                          * for /sys and status word mapped to user programs.
 428                          * This marks unit as not usable, until reset
 429                          */
 430                         *dd->ipath_statusp &= ~IPATH_STATUS_IB_READY;
 431                         *dd->ipath_statusp |= IPATH_STATUS_HWERROR;
 432                         dd->ipath_flags &= ~IPATH_INITTED;
 433                 } else {
 434                         ipath_dbg("Clearing freezemode on ignored hardware "
 435                                   "error\n");
 436                         ipath_write_kreg(dd, dd->ipath_kregs->kr_control,
 437                                          dd->ipath_control);
 438                 }
 439         }
 440
 441         *msg = '\0';
 442
 443         if (hwerrs & INFINIPATH_HWE_MEMBISTFAILED) {
 444                 strlcat(msg, "[Memory BIST test failed, InfiniPath hardware unusable]",
 445                         msgl);
 446                 /* ignore from now on, so disable until driver reloaded */
 447                 *dd->ipath_statusp |= IPATH_STATUS_HWERROR;
 448                 dd->ipath_hwerrmask &= ~INFINIPATH_HWE_MEMBISTFAILED;
 449                 ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrmask,
 450                                  dd->ipath_hwerrmask);
 451         }
 452
 453         ipath_format_hwerrors(hwerrs,
 454                               ipath_6120_hwerror_msgs,
 455                               sizeof(ipath_6120_hwerror_msgs)/
 456                               sizeof(ipath_6120_hwerror_msgs[0]),
 457                               msg, msgl);
 458
 459         if (hwerrs & (INFINIPATH_HWE_PCIEMEMPARITYERR_MASK
 460                       << INFINIPATH_HWE_PCIEMEMPARITYERR_SHIFT)) {
 461                 bits = (u32) ((hwerrs >>
 462                                INFINIPATH_HWE_PCIEMEMPARITYERR_SHIFT) &
 463                               INFINIPATH_HWE_PCIEMEMPARITYERR_MASK);
 464                 snprintf(bitsmsg, sizeof bitsmsg,
 465                          "[PCIe Mem Parity Errs %x] ", bits);
 466                 strlcat(msg, bitsmsg, msgl);
 467         }
 468
 469 #define _IPATH_PLL_FAIL (INFINIPATH_HWE_COREPLL_FBSLIP |        \
 470                          INFINIPATH_HWE_COREPLL_RFSLIP )
 471
 472         if (hwerrs & _IPATH_PLL_FAIL) {
 473                 snprintf(bitsmsg, sizeof bitsmsg,
 474                          "[PLL failed (%llx), InfiniPath hardware unusable]",
 475                          (unsigned long long) hwerrs & _IPATH_PLL_FAIL);
 476                 strlcat(msg, bitsmsg, msgl);
 477                 /* ignore from now on, so disable until driver reloaded */
 478                 dd->ipath_hwerrmask &= ~(hwerrs & _IPATH_PLL_FAIL);
 479                 ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrmask,
 480                                  dd->ipath_hwerrmask);
 481         }
 482
 483         if (hwerrs & INFINIPATH_HWE_SERDESPLLFAILED) {
 484                 /*
 485                  * If it occurs, it is left masked since the eternal
 486                  * interface is unused
 487                  */
 488                 dd->ipath_hwerrmask &= ~INFINIPATH_HWE_SERDESPLLFAILED;
 489                 ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrmask,
 490                                  dd->ipath_hwerrmask);
 491         }
 492
 493         if (*msg)
 494                 ipath_dev_err(dd, "%s hardware error\n", msg);
 495         if (isfatal && !ipath_diag_inuse && dd->ipath_freezemsg) {
 496                 /*
 497                  * for /sys status file ; if no trailing } is copied, we'll
 498                  * know it was truncated.
 499                  */
 500                 snprintf(dd->ipath_freezemsg, dd->ipath_freezelen,
 501                          "{%s}", msg);
 502         }
 503 }
 504
 505 /**
 506  * ipath_pe_boardname - fill in the board name
 507  * @dd: the infinipath device
 508  * @name: the output buffer
 509  * @namelen: the size of the output buffer
 510  *
 511  * info is based on the board revision register
 512  */
 513 static int ipath_pe_boardname(struct ipath_devdata *dd, char *name,
 514                               size_t namelen)
 515 {
 516         char *n = NULL;
 517         u8 boardrev = dd->ipath_boardrev;
 518         int ret;
 519
 520         switch (boardrev) {
 521         case 0:
 522                 n = "InfiniPath_Emulation";
 523                 break;
 524         case 1:
 525                 n = "InfiniPath_QLE7140-Bringup";
 526                 break;
 527         case 2:
 528                 n = "InfiniPath_QLE7140";
 529                 break;
 530         case 3:
 531                 n = "InfiniPath_QMI7140";
 532                 break;
 533         case 4:
 534                 n = "InfiniPath_QEM7140";
 535                 break;
 536         case 5:
 537                 n = "InfiniPath_QMH7140";
 538                 break;
 539         case 6:
 540                 n = "InfiniPath_QLE7142";
 541                 break;
 542         default:
 543                 ipath_dev_err(dd,
 544                               "Don't yet know about board with ID %u\n",
 545                               boardrev);
 546                 snprintf(name, namelen, "Unknown_InfiniPath_PCIe_%u",
 547                          boardrev);
 548                 break;
 549         }
 550         if (n)
 551                 snprintf(name, namelen, "%s", n);
 552
 553         if (dd->ipath_majrev != 4 || !dd->ipath_minrev || dd->ipath_minrev>2) {
 554                 ipath_dev_err(dd, "Unsupported InfiniPath hardware revision %u.%u!\n",
 555                               dd->ipath_majrev, dd->ipath_minrev);
 556                 ret = 1;
 557         } else
 558                 ret = 0;
 559
 560         return ret;
 561 }
 562
 563 /**
 564  * ipath_pe_init_hwerrors - enable hardware errors
 565  * @dd: the infinipath device
 566  *
 567  * now that we have finished initializing everything that might reasonably
 568  * cause a hardware error, and cleared those errors bits as they occur,
 569  * we can enable hardware errors in the mask (potentially enabling
 570  * freeze mode), and enable hardware errors as errors (along with
 571  * everything else) in errormask
 572  */
 573 static void ipath_pe_init_hwerrors(struct ipath_devdata *dd)
 574 {
 575         ipath_err_t val;
 576         u64 extsval;
 577
 578         extsval = ipath_read_kreg64(dd, dd->ipath_kregs->kr_extstatus);
 579
 580         if (!(extsval & INFINIPATH_EXTS_MEMBIST_ENDTEST))
 581                 ipath_dev_err(dd, "MemBIST did not complete!\n");
 582         if (extsval & INFINIPATH_EXTS_MEMBIST_FOUND)
 583                 ipath_dbg("MemBIST corrected\n");
 584
 585         val = ~0ULL;    /* barring bugs, all hwerrors become interrupts, */
 586
 587         if (!dd->ipath_boardrev)        // no PLL for Emulator
 588                 val &= ~INFINIPATH_HWE_SERDESPLLFAILED;
 589
 590         if (dd->ipath_minrev < 2) {
 591                 /* workaround bug 9460 in internal interface bus parity
 592                  * checking. Fixed (HW bug 9490) in Rev2.
 593                  */
 594                 val &= ~INFINIPATH_HWE_PCIEBUSPARITYRADM;
 595         }
 596         dd->ipath_hwerrmask = val;
 597 }
 598
 599 /**
 600  * ipath_pe_bringup_serdes - bring up the serdes
 601  * @dd: the infinipath device
 602  */
 603 static int ipath_pe_bringup_serdes(struct ipath_devdata *dd)
 604 {
 605         u64 val, config1, prev_val;
 606         int ret = 0;
 607
 608         ipath_dbg("Trying to bringup serdes\n");
 609
 610         if (ipath_read_kreg64(dd, dd->ipath_kregs->kr_hwerrstatus) &
 611             INFINIPATH_HWE_SERDESPLLFAILED) {
 612                 ipath_dbg("At start, serdes PLL failed bit set "
 613                           "in hwerrstatus, clearing and continuing\n");
 614                 ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrclear,
 615                                  INFINIPATH_HWE_SERDESPLLFAILED);
 616         }
 617
 618         val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_serdesconfig0);
 619         config1 = ipath_read_kreg64(dd, dd->ipath_kregs->kr_serdesconfig1);
 620
 621         ipath_cdbg(VERBOSE, "SerDes status config0=%llx config1=%llx, "
 622                    "xgxsconfig %llx\n", (unsigned long long) val,
 623                    (unsigned long long) config1, (unsigned long long)
 624                    ipath_read_kreg64(dd, dd->ipath_kregs->kr_xgxsconfig));
 625
 626         /*
 627          * Force reset on, also set rxdetect enable.  Must do before reading
 628          * serdesstatus at least for simulation, or some of the bits in
 629          * serdes status will come back as undefined and cause simulation
 630          * failures
 631          */
 632         val |= INFINIPATH_SERDC0_RESET_PLL | INFINIPATH_SERDC0_RXDETECT_EN
 633                 | INFINIPATH_SERDC0_L1PWR_DN;
 634         ipath_write_kreg(dd, dd->ipath_kregs->kr_serdesconfig0, val);
 635         /* be sure chip saw it */
 636         ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
 637         udelay(5);              /* need pll reset set at least for a bit */
 638         /*
 639          * after PLL is reset, set the per-lane Resets and TxIdle and
 640          * clear the PLL reset and rxdetect (to get falling edge).
 641          * Leave L1PWR bits set (permanently)
 642          */
 643         val &= ~(INFINIPATH_SERDC0_RXDETECT_EN | INFINIPATH_SERDC0_RESET_PLL
 644                  | INFINIPATH_SERDC0_L1PWR_DN);
 645         val |= INFINIPATH_SERDC0_RESET_MASK | INFINIPATH_SERDC0_TXIDLE;
 646         ipath_cdbg(VERBOSE, "Clearing pll reset and setting lane resets "
 647                    "and txidle (%llx)\n", (unsigned long long) val);
 648         ipath_write_kreg(dd, dd->ipath_kregs->kr_serdesconfig0, val);
 649         /* be sure chip saw it */
 650         ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
 651         /* need PLL reset clear for at least 11 usec before lane
 652          * resets cleared; give it a few more to be sure */
 653         udelay(15);
 654         val &= ~(INFINIPATH_SERDC0_RESET_MASK | INFINIPATH_SERDC0_TXIDLE);
 655
 656         ipath_cdbg(VERBOSE, "Clearing lane resets and txidle "
 657                    "(writing %llx)\n", (unsigned long long) val);
 658         ipath_write_kreg(dd, dd->ipath_kregs->kr_serdesconfig0, val);
 659         /* be sure chip saw it */
 660         val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
 661
 662         val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_xgxsconfig);
 663         prev_val = val;
 664         if (((val >> INFINIPATH_XGXS_MDIOADDR_SHIFT) &
 665              INFINIPATH_XGXS_MDIOADDR_MASK) != 3) {
 666                 val &=
 667                         ~(INFINIPATH_XGXS_MDIOADDR_MASK <<
 668                           INFINIPATH_XGXS_MDIOADDR_SHIFT);
 669                 /* MDIO address 3 */
 670                 val |= 3ULL << INFINIPATH_XGXS_MDIOADDR_SHIFT;
 671         }
 672         if (val & INFINIPATH_XGXS_RESET) {
 673                 val &= ~INFINIPATH_XGXS_RESET;
 674         }
 675         if (((val >> INFINIPATH_XGXS_RX_POL_SHIFT) &
 676              INFINIPATH_XGXS_RX_POL_MASK) != dd->ipath_rx_pol_inv ) {
 677                 /* need to compensate for Tx inversion in partner */
 678                 val &= ~(INFINIPATH_XGXS_RX_POL_MASK <<
 679                          INFINIPATH_XGXS_RX_POL_SHIFT);
 680                 val |= dd->ipath_rx_pol_inv <<
 681                         INFINIPATH_XGXS_RX_POL_SHIFT;
 682         }
 683         if (dd->ipath_minrev >= 2) {
 684                 /* Rev 2. can tolerate multiple writes to PBC, and
 685                  * allowing them can provide lower latency on some
 686                  * CPUs, but this feature is off by default, only
 687                  * turned on by setting D63 of XGXSconfig reg.
 688                  * May want to make this conditional more
 689                  * fine-grained in future. This is not exactly
 690                  * related to XGXS, but where the bit ended up.
 691                  */
 692                 val |= INFINIPATH_XGXS_SUPPRESS_ARMLAUNCH_ERR;
 693         }
 694         if (val != prev_val)
 695                 ipath_write_kreg(dd, dd->ipath_kregs->kr_xgxsconfig, val);
 696
 697         val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_serdesconfig0);
 698
 699         /* clear current and de-emphasis bits */
 700         config1 &= ~0x0ffffffff00ULL;
 701         /* set current to 20ma */
 702         config1 |= 0x00000000000ULL;
 703         /* set de-emphasis to -5.68dB */
 704         config1 |= 0x0cccc000000ULL;
 705         ipath_write_kreg(dd, dd->ipath_kregs->kr_serdesconfig1, config1);
 706
 707         ipath_cdbg(VERBOSE, "done: SerDes status config0=%llx "
 708                    "config1=%llx, sstatus=%llx xgxs=%llx\n",
 709                    (unsigned long long) val, (unsigned long long) config1,
 710                    (unsigned long long)
 711                    ipath_read_kreg64(dd, dd->ipath_kregs->kr_serdesstatus),
 712                    (unsigned long long)
 713                    ipath_read_kreg64(dd, dd->ipath_kregs->kr_xgxsconfig));
 714
 715         if (!ipath_waitfor_mdio_cmdready(dd)) {
 716                 ipath_write_kreg(
 717                         dd, dd->ipath_kregs->kr_mdio,
 718                         ipath_mdio_req(IPATH_MDIO_CMD_READ, 31,
 719                                        IPATH_MDIO_CTRL_XGXS_REG_8, 0));
 720                 if (ipath_waitfor_complete(dd, dd->ipath_kregs->kr_mdio,
 721                                            IPATH_MDIO_DATAVALID, &val))
 722                         ipath_dbg("Never got MDIO data for XGXS "
 723                                   "status read\n");
 724                 else
 725                         ipath_cdbg(VERBOSE, "MDIO Read reg8, "
 726                                    "'bank' 31 %x\n", (u32) val);
 727         } else
 728                 ipath_dbg("Never got MDIO cmdready for XGXS status read\n");
 729
 730         return ret;
 731 }
 732
 733 /**
 734  * ipath_pe_quiet_serdes - set serdes to txidle
 735  * @dd: the infinipath device
 736  * Called when driver is being unloaded
 737  */
 738 static void ipath_pe_quiet_serdes(struct ipath_devdata *dd)
 739 {
 740         u64 val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_serdesconfig0);
 741
 742         val |= INFINIPATH_SERDC0_TXIDLE;
 743         ipath_dbg("Setting TxIdleEn on serdes (config0 = %llx)\n",
 744                   (unsigned long long) val);
 745         ipath_write_kreg(dd, dd->ipath_kregs->kr_serdesconfig0, val);
 746 }
 747
 748 static int ipath_pe_intconfig(struct ipath_devdata *dd)
 749 {
 750         u64 val;
 751         u32 chiprev;
 752
 753         /*
 754          * If the chip supports added error indication via GPIO pins,
 755          * enable interrupts on those bits so the interrupt routine
 756          * can count the events. Also set flag so interrupt routine
 757          * can know they are expected.
 758          */
 759         chiprev = dd->ipath_revision >> INFINIPATH_R_CHIPREVMINOR_SHIFT;
 760         if ((chiprev & INFINIPATH_R_CHIPREVMINOR_MASK) > 1) {
 761                 /* Rev2+ reports extra errors via internal GPIO pins */
 762                 dd->ipath_flags |= IPATH_GPIO_ERRINTRS;
 763                 val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_gpio_mask);
 764                 val |= IPATH_GPIO_ERRINTR_MASK;
 765                 ipath_write_kreg( dd, dd->ipath_kregs->kr_gpio_mask, val);
 766         }
 767         return 0;
 768 }
 769
 770 /**
 771  * ipath_setup_pe_setextled - set the state of the two external LEDs
 772  * @dd: the infinipath device
 773  * @lst: the L state
 774  * @ltst: the LT state
 775
 776  * These LEDs indicate the physical and logical state of IB link.
 777  * For this chip (at least with recommended board pinouts), LED1
 778  * is Yellow (logical state) and LED2 is Green (physical state),
 779  *
 780  * Note:  We try to match the Mellanox HCA LED behavior as best
 781  * we can.  Green indicates physical link state is OK (something is
 782  * plugged in, and we can train).
 783  * Amber indicates the link is logically up (ACTIVE).
 784  * Mellanox further blinks the amber LED to indicate data packet
 785  * activity, but we have no hardware support for that, so it would
 786  * require waking up every 10-20 msecs and checking the counters
 787  * on the chip, and then turning the LED off if appropriate.  That's
 788  * visible overhead, so not something we will do.
 789  *
 790  */
 791 static void ipath_setup_pe_setextled(struct ipath_devdata *dd, u64 lst,
 792                                      u64 ltst)
 793 {
 794         u64 extctl;
 795
 796         /* the diags use the LED to indicate diag info, so we leave
 797          * the external LED alone when the diags are running */
 798         if (ipath_diag_inuse)
 799                 return;
 800
 801         extctl = dd->ipath_extctrl & ~(INFINIPATH_EXTC_LED1PRIPORT_ON |
 802                                        INFINIPATH_EXTC_LED2PRIPORT_ON);
 803
 804         if (ltst & INFINIPATH_IBCS_LT_STATE_LINKUP)
 805                 extctl |= INFINIPATH_EXTC_LED2PRIPORT_ON;
 806         if (lst == INFINIPATH_IBCS_L_STATE_ACTIVE)
 807                 extctl |= INFINIPATH_EXTC_LED1PRIPORT_ON;
 808         dd->ipath_extctrl = extctl;
 809         ipath_write_kreg(dd, dd->ipath_kregs->kr_extctrl, extctl);
 810 }
 811
 812 /**
 813  * ipath_setup_pe_cleanup - clean up any per-chip chip-specific stuff
 814  * @dd: the infinipath device
 815  *
 816  * This is called during driver unload.
 817  * We do the pci_disable_msi here, not in generic code, because it
 818  * isn't used for the HT chips. If we do end up needing pci_enable_msi
 819  * at some point in the future for HT, we'll move the call back
 820  * into the main init_one code.
 821  */
 822 static void ipath_setup_pe_cleanup(struct ipath_devdata *dd)
 823 {
 824         dd->ipath_msi_lo = 0;   /* just in case unload fails */
 825         pci_disable_msi(dd->pcidev);
 826 }
 827
 828 /**
 829  * ipath_setup_pe_config - setup PCIe config related stuff
 830  * @dd: the infinipath device
 831  * @pdev: the PCI device
 832  *
 833  * The pci_enable_msi() call will fail on systems with MSI quirks
 834  * such as those with AMD8131, even if the device of interest is not
 835  * attached to that device, (in the 2.6.13 - 2.6.15 kernels, at least, fixed
 836  * late in 2.6.16).
 837  * All that can be done is to edit the kernel source to remove the quirk
 838  * check until that is fixed.
 839  * We do not need to call enable_msi() for our HyperTransport chip,
 840  * even though it uses MSI, and we want to avoid the quirk warning, so
 841  * So we call enable_msi only for PCIe.  If we do end up needing
 842  * pci_enable_msi at some point in the future for HT, we'll move the
 843  * call back into the main init_one code.
 844  * We save the msi lo and hi values, so we can restore them after
 845  * chip reset (the kernel PCI infrastructure doesn't yet handle that
 846  * correctly).
 847  */
 848 static int ipath_setup_pe_config(struct ipath_devdata *dd,
 849                                  struct pci_dev *pdev)
 850 {
 851         int pos, ret;
 852
 853         dd->ipath_msi_lo = 0;   /* used as a flag during reset processing */
 854         ret = pci_enable_msi(dd->pcidev);
 855         if (ret)
 856                 ipath_dev_err(dd, "pci_enable_msi failed: %d, "
 857                               "interrupts may not work\n", ret);
 858         /* continue even if it fails, we may still be OK... */
 859         dd->ipath_irq = pdev->irq;
 860
 861         if ((pos = pci_find_capability(dd->pcidev, PCI_CAP_ID_MSI))) {
 862                 u16 control;
 863                 pci_read_config_dword(dd->pcidev, pos + PCI_MSI_ADDRESS_LO,
 864                                       &dd->ipath_msi_lo);
 865                 pci_read_config_dword(dd->pcidev, pos + PCI_MSI_ADDRESS_HI,
 866                                       &dd->ipath_msi_hi);
 867                 pci_read_config_word(dd->pcidev, pos + PCI_MSI_FLAGS,
 868                                      &control);
 869                 /* now save the data (vector) info */
 870                 pci_read_config_word(dd->pcidev,
 871                                      pos + ((control & PCI_MSI_FLAGS_64BIT)
 872                                             ? 12 : 8),
 873                                      &dd->ipath_msi_data);
 874                 ipath_cdbg(VERBOSE, "Read msi data 0x%x from config offset "
 875                            "0x%x, control=0x%x\n", dd->ipath_msi_data,
 876                            pos + ((control & PCI_MSI_FLAGS_64BIT) ? 12 : 8),
 877                            control);
 878                 /* we save the cachelinesize also, although it doesn't
 879                  * really matter */
 880                 pci_read_config_byte(dd->pcidev, PCI_CACHE_LINE_SIZE,
 881                                      &dd->ipath_pci_cacheline);
 882         } else
 883                 ipath_dev_err(dd, "Can't find MSI capability, "
 884                               "can't save MSI settings for reset\n");
 885         if ((pos = pci_find_capability(dd->pcidev, PCI_CAP_ID_EXP))) {
 886                 u16 linkstat;
 887                 pci_read_config_word(dd->pcidev, pos + PCI_EXP_LNKSTA,
 888                                      &linkstat);
 889                 linkstat >>= 4;
 890                 linkstat &= 0x1f;
 891                 if (linkstat != 8)
 892                         ipath_dev_err(dd, "PCIe width %u, "
 893                                       "performance reduced\n", linkstat);
 894         }
 895         else
 896                 ipath_dev_err(dd, "Can't find PCI Express "
 897                               "capability!\n");
 898         return 0;
 899 }
 900
 901 static void ipath_init_pe_variables(struct ipath_devdata *dd)
 902 {
 903         /*
 904          * bits for selecting i2c direction and values,
 905          * used for I2C serial flash
 906          */
 907         dd->ipath_gpio_sda_num = _IPATH_GPIO_SDA_NUM;
 908         dd->ipath_gpio_scl_num = _IPATH_GPIO_SCL_NUM;
 909         dd->ipath_gpio_sda = IPATH_GPIO_SDA;
 910         dd->ipath_gpio_scl = IPATH_GPIO_SCL;
 911
 912         /* variables for sanity checking interrupt and errors */
 913         dd->ipath_hwe_bitsextant =
 914                 (INFINIPATH_HWE_RXEMEMPARITYERR_MASK <<
 915                  INFINIPATH_HWE_RXEMEMPARITYERR_SHIFT) |
 916                 (INFINIPATH_HWE_TXEMEMPARITYERR_MASK <<
 917                  INFINIPATH_HWE_TXEMEMPARITYERR_SHIFT) |
 918                 (INFINIPATH_HWE_PCIEMEMPARITYERR_MASK <<
 919                  INFINIPATH_HWE_PCIEMEMPARITYERR_SHIFT) |
 920                 INFINIPATH_HWE_PCIE1PLLFAILED |
 921                 INFINIPATH_HWE_PCIE0PLLFAILED |
 922                 INFINIPATH_HWE_PCIEPOISONEDTLP |
 923                 INFINIPATH_HWE_PCIECPLTIMEOUT |
 924                 INFINIPATH_HWE_PCIEBUSPARITYXTLH |
 925                 INFINIPATH_HWE_PCIEBUSPARITYXADM |
 926                 INFINIPATH_HWE_PCIEBUSPARITYRADM |
 927                 INFINIPATH_HWE_MEMBISTFAILED |
 928                 INFINIPATH_HWE_COREPLL_FBSLIP |
 929                 INFINIPATH_HWE_COREPLL_RFSLIP |
 930                 INFINIPATH_HWE_SERDESPLLFAILED |
 931                 INFINIPATH_HWE_IBCBUSTOSPCPARITYERR |
 932                 INFINIPATH_HWE_IBCBUSFRSPCPARITYERR;
 933         dd->ipath_i_bitsextant =
 934                 (INFINIPATH_I_RCVURG_MASK << INFINIPATH_I_RCVURG_SHIFT) |
 935                 (INFINIPATH_I_RCVAVAIL_MASK <<
 936                  INFINIPATH_I_RCVAVAIL_SHIFT) |
 937                 INFINIPATH_I_ERROR | INFINIPATH_I_SPIOSENT |
 938                 INFINIPATH_I_SPIOBUFAVAIL | INFINIPATH_I_GPIO;
 939         dd->ipath_e_bitsextant =
 940                 INFINIPATH_E_RFORMATERR | INFINIPATH_E_RVCRC |
 941                 INFINIPATH_E_RICRC | INFINIPATH_E_RMINPKTLEN |
 942                 INFINIPATH_E_RMAXPKTLEN | INFINIPATH_E_RLONGPKTLEN |
 943                 INFINIPATH_E_RSHORTPKTLEN | INFINIPATH_E_RUNEXPCHAR |
 944                 INFINIPATH_E_RUNSUPVL | INFINIPATH_E_REBP |
 945                 INFINIPATH_E_RIBFLOW | INFINIPATH_E_RBADVERSION |
 946                 INFINIPATH_E_RRCVEGRFULL | INFINIPATH_E_RRCVHDRFULL |
 947                 INFINIPATH_E_RBADTID | INFINIPATH_E_RHDRLEN |
 948                 INFINIPATH_E_RHDR | INFINIPATH_E_RIBLOSTLINK |
 949                 INFINIPATH_E_SMINPKTLEN | INFINIPATH_E_SMAXPKTLEN |
 950                 INFINIPATH_E_SUNDERRUN | INFINIPATH_E_SPKTLEN |
 951                 INFINIPATH_E_SDROPPEDSMPPKT | INFINIPATH_E_SDROPPEDDATAPKT |
 952                 INFINIPATH_E_SPIOARMLAUNCH | INFINIPATH_E_SUNEXPERRPKTNUM |
 953                 INFINIPATH_E_SUNSUPVL | INFINIPATH_E_IBSTATUSCHANGED |
 954                 INFINIPATH_E_INVALIDADDR | INFINIPATH_E_RESET |
 955                 INFINIPATH_E_HARDWARE;
 956
 957         dd->ipath_i_rcvavail_mask = INFINIPATH_I_RCVAVAIL_MASK;
 958         dd->ipath_i_rcvurg_mask = INFINIPATH_I_RCVURG_MASK;
 959 }
 960
 961 /* setup the MSI stuff again after a reset.  I'd like to just call
 962  * pci_enable_msi() and request_irq() again, but when I do that,
 963  * the MSI enable bit doesn't get set in the command word, and
 964  * we switch to to a different interrupt vector, which is confusing,
 965  * so I instead just do it all inline.  Perhaps somehow can tie this
 966  * into the PCIe hotplug support at some point
 967  * Note, because I'm doing it all here, I don't call pci_disable_msi()
 968  * or free_irq() at the start of ipath_setup_pe_reset().
 969  */
 970 static int ipath_reinit_msi(struct ipath_devdata *dd)
 971 {
 972         int pos;
 973         u16 control;
 974         int ret;
 975
 976         if (!dd->ipath_msi_lo) {
 977                 dev_info(&dd->pcidev->dev, "Can't restore MSI config, "
 978                          "initial setup failed?\n");
 979                 ret = 0;
 980                 goto bail;
 981         }
 982
 983         if (!(pos = pci_find_capability(dd->pcidev, PCI_CAP_ID_MSI))) {
 984                 ipath_dev_err(dd, "Can't find MSI capability, "
 985                               "can't restore MSI settings\n");
 986                 ret = 0;
 987                 goto bail;
 988         }
 989         ipath_cdbg(VERBOSE, "Writing msi_lo 0x%x to config offset 0x%x\n",
 990                    dd->ipath_msi_lo, pos + PCI_MSI_ADDRESS_LO);
 991         pci_write_config_dword(dd->pcidev, pos + PCI_MSI_ADDRESS_LO,
 992                                dd->ipath_msi_lo);
 993         ipath_cdbg(VERBOSE, "Writing msi_lo 0x%x to config offset 0x%x\n",
 994                    dd->ipath_msi_hi, pos + PCI_MSI_ADDRESS_HI);
 995         pci_write_config_dword(dd->pcidev, pos + PCI_MSI_ADDRESS_HI,
 996                                dd->ipath_msi_hi);
 997         pci_read_config_word(dd->pcidev, pos + PCI_MSI_FLAGS, &control);
 998         if (!(control & PCI_MSI_FLAGS_ENABLE)) {
 999                 ipath_cdbg(VERBOSE, "MSI control at off %x was %x, "
1000                            "setting MSI enable (%x)\n", pos + PCI_MSI_FLAGS,
1001                            control, control | PCI_MSI_FLAGS_ENABLE);
1002                 control |= PCI_MSI_FLAGS_ENABLE;
1003                 pci_write_config_word(dd->pcidev, pos + PCI_MSI_FLAGS,
1004                                       control);
1005         }
1006         /* now rewrite the data (vector) info */
1007         pci_write_config_word(dd->pcidev, pos +
1008                               ((control & PCI_MSI_FLAGS_64BIT) ? 12 : 8),
1009                               dd->ipath_msi_data);
1010         /* we restore the cachelinesize also, although it doesn't really
1011          * matter */
1012         pci_write_config_byte(dd->pcidev, PCI_CACHE_LINE_SIZE,
1013                               dd->ipath_pci_cacheline);
1014         /* and now set the pci master bit again */
1015         pci_set_master(dd->pcidev);
1016         ret = 1;
1017
1018 bail:
1019         return ret;
1020 }
1021
1022 /* This routine sleeps, so it can only be called from user context, not
1023  * from interrupt context.  If we need interrupt context, we can split
1024  * it into two routines.
1025 */
1026 static int ipath_setup_pe_reset(struct ipath_devdata *dd)
1027 {
1028         u64 val;
1029         int i;
1030         int ret;
1031
1032         /* Use ERROR so it shows up in logs, etc. */
1033         ipath_dev_err(dd, "Resetting InfiniPath unit %u\n", dd->ipath_unit);
1034         /* keep chip from being accessed in a few places */
1035         dd->ipath_flags &= ~(IPATH_INITTED|IPATH_PRESENT);
1036         val = dd->ipath_control | INFINIPATH_C_RESET;
1037         ipath_write_kreg(dd, dd->ipath_kregs->kr_control, val);
1038         mb();
1039
1040         for (i = 1; i <= 5; i++) {
1041                 int r;
1042                 /* allow MBIST, etc. to complete; longer on each retry.
1043                  * We sometimes get machine checks from bus timeout if no
1044                  * response, so for now, make it *really* long.
1045                  */
1046                 msleep(1000 + (1 + i) * 2000);
1047                 if ((r =
1048                      pci_write_config_dword(dd->pcidev, PCI_BASE_ADDRESS_0,
1049                                             dd->ipath_pcibar0)))
1050                         ipath_dev_err(dd, "rewrite of BAR0 failed: %d\n",
1051                                       r);
1052                 if ((r =
1053                      pci_write_config_dword(dd->pcidev, PCI_BASE_ADDRESS_1,
1054                                             dd->ipath_pcibar1)))
1055                         ipath_dev_err(dd, "rewrite of BAR1 failed: %d\n",
1056                                       r);
1057                 /* now re-enable memory access */
1058                 if ((r = pci_enable_device(dd->pcidev)))
1059                         ipath_dev_err(dd, "pci_enable_device failed after "
1060                                       "reset: %d\n", r);
1061                 /* whether it worked or not, mark as present, again */
1062                 dd->ipath_flags |= IPATH_PRESENT;
1063                 val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_revision);
1064                 if (val == dd->ipath_revision) {
1065                         ipath_cdbg(VERBOSE, "Got matching revision "
1066                                    "register %llx on try %d\n",
1067                                    (unsigned long long) val, i);
1068                         ret = ipath_reinit_msi(dd);
1069                         goto bail;
1070                 }
1071                 /* Probably getting -1 back */
1072                 ipath_dbg("Didn't get expected revision register, "
1073                           "got %llx, try %d\n", (unsigned long long) val,
1074                           i + 1);
1075         }
1076         ret = 0; /* failed */
1077
1078 bail:
1079         return ret;
1080 }
1081
1082 /**
1083  * ipath_pe_put_tid - write a TID in chip
1084  * @dd: the infinipath device
1085  * @tidptr: pointer to the expected TID (in chip) to udpate
1086  * @tidtype: 0 for eager, 1 for expected
1087  * @pa: physical address of in memory buffer; ipath_tidinvalid if freeing
1088  *
1089  * This exists as a separate routine to allow for special locking etc.
1090  * It's used for both the full cleanup on exit, as well as the normal
1091  * setup and teardown.
1092  */
1093 static void ipath_pe_put_tid(struct ipath_devdata *dd, u64 __iomem *tidptr,
1094                              u32 type, unsigned long pa)
1095 {
1096         u32 __iomem *tidp32 = (u32 __iomem *)tidptr;
1097         unsigned long flags = 0; /* keep gcc quiet */
1098
1099         if (pa != dd->ipath_tidinvalid) {
1100                 if (pa & ((1U << 11) - 1)) {
1101                         dev_info(&dd->pcidev->dev, "BUG: physaddr %lx "
1102                                  "not 4KB aligned!\n", pa);
1103                         return;
1104                 }
1105                 pa >>= 11;
1106                 /* paranoia check */
1107                 if (pa & (7<<29))
1108                         ipath_dev_err(dd,
1109                                       "BUG: Physical page address 0x%lx "
1110                                       "has bits set in 31-29\n", pa);
1111
1112                 if (type == 0)
1113                         pa |= dd->ipath_tidtemplate;
1114                 else /* for now, always full 4KB page */
1115                         pa |= 2 << 29;
1116         }
1117
1118         /* workaround chip bug 9437 by writing each TID twice
1119          * and holding a spinlock around the writes, so they don't
1120          * intermix with other TID (eager or expected) writes
1121          * Unfortunately, this call can be done from interrupt level
1122          * for the port 0 eager TIDs, so we have to use irqsave
1123          */
1124         spin_lock_irqsave(&dd->ipath_tid_lock, flags);
1125         ipath_write_kreg(dd, dd->ipath_kregs->kr_scratch, 0xfeeddeaf);
1126         if (dd->ipath_kregbase)
1127                 writel(pa, tidp32);
1128         ipath_write_kreg(dd, dd->ipath_kregs->kr_scratch, 0xdeadbeef);
1129         mmiowb();
1130         spin_unlock_irqrestore(&dd->ipath_tid_lock, flags);
1131 }
1132 /**
1133  * ipath_pe_put_tid_2 - write a TID in chip, Revision 2 or higher
1134  * @dd: the infinipath device
1135  * @tidptr: pointer to the expected TID (in chip) to udpate
1136  * @tidtype: 0 for eager, 1 for expected
1137  * @pa: physical address of in memory buffer; ipath_tidinvalid if freeing
1138  *
1139  * This exists as a separate routine to allow for selection of the
1140  * appropriate "flavor". The static calls in cleanup just use the
1141  * revision-agnostic form, as they are not performance critical.
1142  */
1143 static void ipath_pe_put_tid_2(struct ipath_devdata *dd, u64 __iomem *tidptr,
1144                              u32 type, unsigned long pa)
1145 {
1146         u32 __iomem *tidp32 = (u32 __iomem *)tidptr;
1147
1148         if (pa != dd->ipath_tidinvalid) {
1149                 if (pa & ((1U << 11) - 1)) {
1150                         dev_info(&dd->pcidev->dev, "BUG: physaddr %lx "
1151                                  "not 2KB aligned!\n", pa);
1152                         return;
1153                 }
1154                 pa >>= 11;
1155                 /* paranoia check */
1156                 if (pa & (7<<29))
1157                         ipath_dev_err(dd,
1158                                       "BUG: Physical page address 0x%lx "
1159                                       "has bits set in 31-29\n", pa);
1160
1161                 if (type == 0)
1162                         pa |= dd->ipath_tidtemplate;
1163                 else /* for now, always full 4KB page */
1164                         pa |= 2 << 29;
1165         }
1166         if (dd->ipath_kregbase)
1167                 writel(pa, tidp32);
1168         mmiowb();
1169 }
1170
1171
1172 /**
1173  * ipath_pe_clear_tid - clear all TID entries for a port, expected and eager
1174  * @dd: the infinipath device
1175  * @port: the port
1176  *
1177  * clear all TID entries for a port, expected and eager.
1178  * Used from ipath_close().  On this chip, TIDs are only 32 bits,
1179  * not 64, but they are still on 64 bit boundaries, so tidbase
1180  * is declared as u64 * for the pointer math, even though we write 32 bits
1181  */
1182 static void ipath_pe_clear_tids(struct ipath_devdata *dd, unsigned port)
1183 {
1184         u64 __iomem *tidbase;
1185         unsigned long tidinv;
1186         int i;
1187
1188         if (!dd->ipath_kregbase)
1189                 return;
1190
1191         ipath_cdbg(VERBOSE, "Invalidate TIDs for port %u\n", port);
1192
1193         tidinv = dd->ipath_tidinvalid;
1194         tidbase = (u64 __iomem *)
1195                 ((char __iomem *)(dd->ipath_kregbase) +
1196                  dd->ipath_rcvtidbase +
1197                  port * dd->ipath_rcvtidcnt * sizeof(*tidbase));
1198
1199         for (i = 0; i < dd->ipath_rcvtidcnt; i++)
1200                 ipath_pe_put_tid(dd, &tidbase[i], 0, tidinv);
1201
1202         tidbase = (u64 __iomem *)
1203                 ((char __iomem *)(dd->ipath_kregbase) +
1204                  dd->ipath_rcvegrbase +
1205                  port * dd->ipath_rcvegrcnt * sizeof(*tidbase));
1206
1207         for (i = 0; i < dd->ipath_rcvegrcnt; i++)
1208                 ipath_pe_put_tid(dd, &tidbase[i], 1, tidinv);
1209 }
1210
1211 /**
1212  * ipath_pe_tidtemplate - setup constants for TID updates
1213  * @dd: the infinipath device
1214  *
1215  * We setup stuff that we use a lot, to avoid calculating each time
1216  */
1217 static void ipath_pe_tidtemplate(struct ipath_devdata *dd)
1218 {
1219         u32 egrsize = dd->ipath_rcvegrbufsize;
1220
1221         /* For now, we always allocate 4KB buffers (at init) so we can
1222          * receive max size packets.  We may want a module parameter to
1223          * specify 2KB or 4KB and/or make be per port instead of per device
1224          * for those who want to reduce memory footprint.  Note that the
1225          * ipath_rcvhdrentsize size must be large enough to hold the largest
1226          * IB header (currently 96 bytes) that we expect to handle (plus of
1227          * course the 2 dwords of RHF).
1228          */
1229         if (egrsize == 2048)
1230                 dd->ipath_tidtemplate = 1U << 29;
1231         else if (egrsize == 4096)
1232                 dd->ipath_tidtemplate = 2U << 29;
1233         else {
1234                 egrsize = 4096;
1235                 dev_info(&dd->pcidev->dev, "BUG: unsupported egrbufsize "
1236                          "%u, using %u\n", dd->ipath_rcvegrbufsize,
1237                          egrsize);
1238                 dd->ipath_tidtemplate = 2U << 29;
1239         }
1240         dd->ipath_tidinvalid = 0;
1241 }
1242
1243 static int ipath_pe_early_init(struct ipath_devdata *dd)
1244 {
1245         dd->ipath_flags |= IPATH_4BYTE_TID;
1246
1247         /*
1248          * For openfabrics, we need to be able to handle an IB header of
1249          * 24 dwords.  HT chip has arbitrary sized receive buffers, so we
1250          * made them the same size as the PIO buffers.  This chip does not
1251          * handle arbitrary size buffers, so we need the header large enough
1252          * to handle largest IB header, but still have room for a 2KB MTU
1253          * standard IB packet.
1254          */
1255         dd->ipath_rcvhdrentsize = 24;
1256         dd->ipath_rcvhdrsize = IPATH_DFLT_RCVHDRSIZE;
1257
1258         /*
1259          * To truly support a 4KB MTU (for usermode), we need to
1260          * bump this to a larger value.  For now, we use them for
1261          * the kernel only.
1262          */
1263         dd->ipath_rcvegrbufsize = 2048;
1264         /*
1265          * the min() check here is currently a nop, but it may not always
1266          * be, depending on just how we do ipath_rcvegrbufsize
1267          */
1268         dd->ipath_ibmaxlen = min(dd->ipath_piosize2k,
1269                                  dd->ipath_rcvegrbufsize +
1270                                  (dd->ipath_rcvhdrentsize << 2));
1271         dd->ipath_init_ibmaxlen = dd->ipath_ibmaxlen;
1272
1273         /*
1274          * We can request a receive interrupt for 1 or
1275          * more packets from current offset.  For now, we set this
1276          * up for a single packet.
1277          */
1278         dd->ipath_rhdrhead_intr_off = 1ULL<<32;
1279
1280         ipath_get_eeprom_info(dd);
1281
1282         return 0;
1283 }
1284
1285 int __attribute__((weak)) ipath_unordered_wc(void)
1286 {
1287         return 0;
1288 }
1289
1290 /**
1291  * ipath_init_pe_get_base_info - set chip-specific flags for user code
1292  * @pd: the infinipath port
1293  * @kbase: ipath_base_info pointer
1294  *
1295  * We set the PCIE flag because the lower bandwidth on PCIe vs
1296  * HyperTransport can affect some user packet algorithms.
1297  */
1298 static int ipath_pe_get_base_info(struct ipath_portdata *pd, void *kbase)
1299 {
1300         struct ipath_base_info *kinfo = kbase;
1301         struct ipath_devdata *dd;
1302
1303         if (ipath_unordered_wc()) {
1304                 kinfo->spi_runtime_flags |= IPATH_RUNTIME_FORCE_WC_ORDER;
1305                 ipath_cdbg(PROC, "Intel processor, forcing WC order\n");
1306         }
1307         else
1308                 ipath_cdbg(PROC, "Not Intel processor, WC ordered\n");
1309
1310         if (pd == NULL)
1311                 goto done;
1312
1313         dd = pd->port_dd;
1314
1315         if (dd != NULL && dd->ipath_minrev >= 2) {
1316                 ipath_cdbg(PROC, "IBA6120 Rev2, allow multiple PBC write\n");
1317                 kinfo->spi_runtime_flags |= IPATH_RUNTIME_PBC_REWRITE;
1318                 ipath_cdbg(PROC, "IBA6120 Rev2, allow loose DMA alignment\n");
1319                 kinfo->spi_runtime_flags |= IPATH_RUNTIME_LOOSE_DMA_ALIGN;
1320         }
1321
1322 done:
1323         kinfo->spi_runtime_flags |= IPATH_RUNTIME_PCIE;
1324         return 0;
1325 }
1326
1327 static void ipath_pe_free_irq(struct ipath_devdata *dd)
1328 {
1329         free_irq(dd->ipath_irq, dd);
1330         dd->ipath_irq = 0;
1331 }
1332
1333 /*
1334  * On platforms using this chip, and not having ordered WC stores, we
1335  * can get TXE parity errors due to speculative reads to the PIO buffers,
1336  * and this, due to a chip bug can result in (many) false parity error
1337  * reports.  So it's a debug print on those, and an info print on systems
1338  * where the speculative reads don't occur.
1339  * Because we can get lots of false errors, we have no upper limit
1340  * on recovery attempts on those platforms.
1341  */
1342 static int ipath_pe_txe_recover(struct ipath_devdata *dd)
1343 {
1344         if (ipath_unordered_wc())
1345                 ipath_dbg("Recovering from TXE PIO parity error\n");
1346         else {
1347                 int cnt = ++ipath_stats.sps_txeparity;
1348                 if (cnt >= IPATH_MAX_PARITY_ATTEMPTS)  {
1349                         if (cnt == IPATH_MAX_PARITY_ATTEMPTS)
1350                                 ipath_dev_err(dd,
1351                                         "Too many attempts to recover from "
1352                                         "TXE parity, giving up\n");
1353                         return 0;
1354                 }
1355                 dev_info(&dd->pcidev->dev,
1356                         "Recovering from TXE PIO parity error\n");
1357         }
1358         ipath_disarm_senderrbufs(dd, 1);
1359         return 1;
1360 }
1361
1362 /**
1363  * ipath_init_iba6120_funcs - set up the chip-specific function pointers
1364  * @dd: the infinipath device
1365  *
1366  * This is global, and is called directly at init to set up the
1367  * chip-specific function pointers for later use.
1368  */
1369 void ipath_init_iba6120_funcs(struct ipath_devdata *dd)
1370 {
1371         dd->ipath_f_intrsetup = ipath_pe_intconfig;
1372         dd->ipath_f_bus = ipath_setup_pe_config;
1373         dd->ipath_f_reset = ipath_setup_pe_reset;
1374         dd->ipath_f_get_boardname = ipath_pe_boardname;
1375         dd->ipath_f_init_hwerrors = ipath_pe_init_hwerrors;
1376         dd->ipath_f_early_init = ipath_pe_early_init;
1377         dd->ipath_f_handle_hwerrors = ipath_pe_handle_hwerrors;
1378         dd->ipath_f_quiet_serdes = ipath_pe_quiet_serdes;
1379         dd->ipath_f_bringup_serdes = ipath_pe_bringup_serdes;
1380         dd->ipath_f_clear_tids = ipath_pe_clear_tids;
1381         if (dd->ipath_minrev >= 2)
1382                 dd->ipath_f_put_tid = ipath_pe_put_tid_2;
1383         else
1384                 dd->ipath_f_put_tid = ipath_pe_put_tid;
1385         dd->ipath_f_cleanup = ipath_setup_pe_cleanup;
1386         dd->ipath_f_setextled = ipath_setup_pe_setextled;
1387         dd->ipath_f_get_base_info = ipath_pe_get_base_info;
1388         dd->ipath_f_free_irq = ipath_pe_free_irq;
1389
1390         /* initialize chip-specific variables */
1391         dd->ipath_f_tidtemplate = ipath_pe_tidtemplate;
1392
1393         /*
1394          * setup the register offsets, since they are different for each
1395          * chip
1396          */
1397         dd->ipath_kregs = &ipath_pe_kregs;
1398         dd->ipath_cregs = &ipath_pe_cregs;
1399
1400         ipath_init_pe_variables(dd);
1401 }
1402