/* * Copyright (c) 2013 Intel Corporation. All rights reserved. * Copyright (c) 2006 - 2012 QLogic Corporation. All rights reserved. * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU * General Public License (GPL) Version 2, available from the file * COPYING in the main directory of this source tree, or the * OpenIB.org BSD license below: * * Redistribution and use in source and binary forms, with or * without modification, are permitted provided that the following * conditions are met: * * - Redistributions of source code must retain the above * copyright notice, this list of conditions and the following * disclaimer. * * - Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials * provided with the distribution. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ /* * This file contains all of the code that is specific to the SerDes * on the QLogic_IB 7220 chip. */ #include #include #include #include #include "qib.h" #include "qib_7220.h" #define SD7220_FW_NAME "qlogic/sd7220.fw" MODULE_FIRMWARE(SD7220_FW_NAME); /* * Same as in qib_iba7220.c, but just the registers needed here. * Could move whole set to qib_7220.h, but decided better to keep * local. */ #define KREG_IDX(regname) (QIB_7220_##regname##_OFFS / sizeof(u64)) #define kr_hwerrclear KREG_IDX(HwErrClear) #define kr_hwerrmask KREG_IDX(HwErrMask) #define kr_hwerrstatus KREG_IDX(HwErrStatus) #define kr_ibcstatus KREG_IDX(IBCStatus) #define kr_ibserdesctrl KREG_IDX(IBSerDesCtrl) #define kr_scratch KREG_IDX(Scratch) #define kr_xgxs_cfg KREG_IDX(XGXSCfg) /* these are used only here, not in qib_iba7220.c */ #define kr_ibsd_epb_access_ctrl KREG_IDX(ibsd_epb_access_ctrl) #define kr_ibsd_epb_transaction_reg KREG_IDX(ibsd_epb_transaction_reg) #define kr_pciesd_epb_transaction_reg KREG_IDX(pciesd_epb_transaction_reg) #define kr_pciesd_epb_access_ctrl KREG_IDX(pciesd_epb_access_ctrl) #define kr_serdes_ddsrxeq0 KREG_IDX(SerDes_DDSRXEQ0) /* * The IBSerDesMappTable is a memory that holds values to be stored in * various SerDes registers by IBC. */ #define kr_serdes_maptable KREG_IDX(IBSerDesMappTable) /* * Below used for sdnum parameter, selecting one of the two sections * used for PCIe, or the single SerDes used for IB. */ #define PCIE_SERDES0 0 #define PCIE_SERDES1 1 /* * The EPB requires addressing in a particular form. EPB_LOC() is intended * to make #definitions a little more readable. */ #define EPB_ADDR_SHF 8 #define EPB_LOC(chn, elt, reg) \ (((elt & 0xf) | ((chn & 7) << 4) | ((reg & 0x3f) << 9)) << \ EPB_ADDR_SHF) #define EPB_IB_QUAD0_CS_SHF (25) #define EPB_IB_QUAD0_CS (1U << EPB_IB_QUAD0_CS_SHF) #define EPB_IB_UC_CS_SHF (26) #define EPB_PCIE_UC_CS_SHF (27) #define EPB_GLOBAL_WR (1U << (EPB_ADDR_SHF + 8)) /* Forward declarations. */ static int qib_sd7220_reg_mod(struct qib_devdata *dd, int sdnum, u32 loc, u32 data, u32 mask); static int ibsd_mod_allchnls(struct qib_devdata *dd, int loc, int val, int mask); static int qib_sd_trimdone_poll(struct qib_devdata *dd); static void qib_sd_trimdone_monitor(struct qib_devdata *dd, const char *where); static int qib_sd_setvals(struct qib_devdata *dd); static int qib_sd_early(struct qib_devdata *dd); static int qib_sd_dactrim(struct qib_devdata *dd); static int qib_internal_presets(struct qib_devdata *dd); /* Tweak the register (CMUCTRL5) that contains the TRIMSELF controls */ static int qib_sd_trimself(struct qib_devdata *dd, int val); static int epb_access(struct qib_devdata *dd, int sdnum, int claim); static int qib_sd7220_ib_load(struct qib_devdata *dd, const struct firmware *fw); static int qib_sd7220_ib_vfy(struct qib_devdata *dd, const struct firmware *fw); /* * Below keeps track of whether the "once per power-on" initialization has * been done, because uC code Version 1.32.17 or higher allows the uC to * be reset at will, and Automatic Equalization may require it. So the * state of the reset "pin", is no longer valid. Instead, we check for the * actual uC code having been loaded. */ static int qib_ibsd_ucode_loaded(struct qib_pportdata *ppd, const struct firmware *fw) { struct qib_devdata *dd = ppd->dd; if (!dd->cspec->serdes_first_init_done && qib_sd7220_ib_vfy(dd, fw) > 0) dd->cspec->serdes_first_init_done = 1; return dd->cspec->serdes_first_init_done; } /* repeat #define for local use. "Real" #define is in qib_iba7220.c */ #define QLOGIC_IB_HWE_IB_UC_MEMORYPARITYERR 0x0000004000000000ULL #define IB_MPREG5 (EPB_LOC(6, 0, 0xE) | (1L << EPB_IB_UC_CS_SHF)) #define IB_MPREG6 (EPB_LOC(6, 0, 0xF) | (1U << EPB_IB_UC_CS_SHF)) #define UC_PAR_CLR_D 8 #define UC_PAR_CLR_M 0xC #define IB_CTRL2(chn) (EPB_LOC(chn, 7, 3) | EPB_IB_QUAD0_CS) #define START_EQ1(chan) EPB_LOC(chan, 7, 0x27) void qib_sd7220_clr_ibpar(struct qib_devdata *dd) { int ret; /* clear, then re-enable parity errs */ ret = qib_sd7220_reg_mod(dd, IB_7220_SERDES, IB_MPREG6, UC_PAR_CLR_D, UC_PAR_CLR_M); if (ret < 0) { qib_dev_err(dd, "Failed clearing IBSerDes Parity err\n"); goto bail; } ret = qib_sd7220_reg_mod(dd, IB_7220_SERDES, IB_MPREG6, 0, UC_PAR_CLR_M); qib_read_kreg32(dd, kr_scratch); udelay(4); qib_write_kreg(dd, kr_hwerrclear, QLOGIC_IB_HWE_IB_UC_MEMORYPARITYERR); qib_read_kreg32(dd, kr_scratch); bail: return; } /* * After a reset or other unusual event, the epb interface may need * to be re-synchronized, between the host and the uC. * returns <0 for failure to resync within IBSD_RESYNC_TRIES (not expected) */ #define IBSD_RESYNC_TRIES 3 #define IB_PGUDP(chn) (EPB_LOC((chn), 2, 1) | EPB_IB_QUAD0_CS) #define IB_CMUDONE(chn) (EPB_LOC((chn), 7, 0xF) | EPB_IB_QUAD0_CS) static int qib_resync_ibepb(struct qib_devdata *dd) { int ret, pat, tries, chn; u32 loc; ret = -1; chn = 0; for (tries = 0; tries < (4 * IBSD_RESYNC_TRIES); ++tries) { loc = IB_PGUDP(chn); ret = qib_sd7220_reg_mod(dd, IB_7220_SERDES, loc, 0, 0); if (ret < 0) { qib_dev_err(dd, "Failed read in resync\n"); continue; } if (ret != 0xF0 && ret != 0x55 && tries == 0) qib_dev_err(dd, "unexpected pattern in resync\n"); pat = ret ^ 0xA5; /* alternate F0 and 55 */ ret = qib_sd7220_reg_mod(dd, IB_7220_SERDES, loc, pat, 0xFF); if (ret < 0) { qib_dev_err(dd, "Failed write in resync\n"); continue; } ret = qib_sd7220_reg_mod(dd, IB_7220_SERDES, loc, 0, 0); if (ret < 0) { qib_dev_err(dd, "Failed re-read in resync\n"); continue; } if (ret != pat) { qib_dev_err(dd, "Failed compare1 in resync\n"); continue; } loc = IB_CMUDONE(chn); ret = qib_sd7220_reg_mod(dd, IB_7220_SERDES, loc, 0, 0); if (ret < 0) { qib_dev_err(dd, "Failed CMUDONE rd in resync\n"); continue; } if ((ret & 0x70) != ((chn << 4) | 0x40)) { qib_dev_err(dd, "Bad CMUDONE value %02X, chn %d\n", ret, chn); continue; } if (++chn == 4) break; /* Success */ } return (ret > 0) ? 0 : ret; } /* * Localize the stuff that should be done to change IB uC reset * returns <0 for errors. */ static int qib_ibsd_reset(struct qib_devdata *dd, int assert_rst) { u64 rst_val; int ret = 0; unsigned long flags; rst_val = qib_read_kreg64(dd, kr_ibserdesctrl); if (assert_rst) { /* * Vendor recommends "interrupting" uC before reset, to * minimize possible glitches. */ spin_lock_irqsave(&dd->cspec->sdepb_lock, flags); epb_access(dd, IB_7220_SERDES, 1); rst_val |= 1ULL; /* Squelch possible parity error from _asserting_ reset */ qib_write_kreg(dd, kr_hwerrmask, dd->cspec->hwerrmask & ~QLOGIC_IB_HWE_IB_UC_MEMORYPARITYERR); qib_write_kreg(dd, kr_ibserdesctrl, rst_val); /* flush write, delay to ensure it took effect */ qib_read_kreg32(dd, kr_scratch); udelay(2); /* once it's reset, can remove interrupt */ epb_access(dd, IB_7220_SERDES, -1); spin_unlock_irqrestore(&dd->cspec->sdepb_lock, flags); } else { /* * Before we de-assert reset, we need to deal with * possible glitch on the Parity-error line. * Suppress it around the reset, both in chip-level * hwerrmask and in IB uC control reg. uC will allow * it again during startup. */ u64 val; rst_val &= ~(1ULL); qib_write_kreg(dd, kr_hwerrmask, dd->cspec->hwerrmask & ~QLOGIC_IB_HWE_IB_UC_MEMORYPARITYERR); ret = qib_resync_ibepb(dd); if (ret < 0) qib_dev_err(dd, "unable to re-sync IB EPB\n"); /* set uC control regs to suppress parity errs */ ret = qib_sd7220_reg_mod(dd, IB_7220_SERDES, IB_MPREG5, 1, 1); if (ret < 0) goto bail; /* IB uC code past Version 1.32.17 allow suppression of wdog */ ret = qib_sd7220_reg_mod(dd, IB_7220_SERDES, IB_MPREG6, 0x80, 0x80); if (ret < 0) { qib_dev_err(dd, "Failed to set WDOG disable\n"); goto bail; } qib_write_kreg(dd, kr_ibserdesctrl, rst_val); /* flush write, delay for startup */ qib_read_kreg32(dd, kr_scratch); udelay(1); /* clear, then re-enable parity errs */ qib_sd7220_clr_ibpar(dd); val = qib_read_kreg64(dd, kr_hwerrstatus); if (val & QLOGIC_IB_HWE_IB_UC_MEMORYPARITYERR) { qib_dev_err(dd, "IBUC Parity still set after RST\n"); dd->cspec->hwerrmask &= ~QLOGIC_IB_HWE_IB_UC_MEMORYPARITYERR; } qib_write_kreg(dd, kr_hwerrmask, dd->cspec->hwerrmask); } bail: return ret; } static void qib_sd_trimdone_monitor(struct qib_devdata *dd, const char *where) { int ret, chn, baduns; u64 val; if (!where) where = "?"; /* give time for reset to settle out in EPB */ udelay(2); ret = qib_resync_ibepb(dd); if (ret < 0) qib_dev_err(dd, "not able to re-sync IB EPB (%s)\n", where); /* Do "sacrificial read" to get EPB in sane state after reset */ ret = qib_sd7220_reg_mod(dd, IB_7220_SERDES, IB_CTRL2(0), 0, 0); if (ret < 0) qib_dev_err(dd, "Failed TRIMDONE 1st read, (%s)\n", where); /* Check/show "summary" Trim-done bit in IBCStatus */ val = qib_read_kreg64(dd, kr_ibcstatus); if (!(val & (1ULL << 11))) qib_dev_err(dd, "IBCS TRIMDONE clear (%s)\n", where); /* * Do "dummy read/mod/wr" to get EPB in sane state after reset * The default value for MPREG6 is 0. */ udelay(2); ret = qib_sd7220_reg_mod(dd, IB_7220_SERDES, IB_MPREG6, 0x80, 0x80); if (ret < 0) qib_dev_err(dd, "Failed Dummy RMW, (%s)\n", where); udelay(10); baduns = 0; for (chn = 3; chn >= 0; --chn) { /* Read CTRL reg for each channel to check TRIMDONE */ ret = qib_sd7220_reg_mod(dd, IB_7220_SERDES, IB_CTRL2(chn), 0, 0); if (ret < 0) qib_dev_err(dd, "Failed checking TRIMDONE, chn %d (%s)\n", chn, where); if (!(ret & 0x10)) { int probe; baduns |= (1 << chn); qib_dev_err(dd, "TRIMDONE cleared on chn %d (%02X). (%s)\n", chn, ret, where); probe = qib_sd7220_reg_mod(dd, IB_7220_SERDES, IB_PGUDP(0), 0, 0); qib_dev_err(dd, "probe is %d (%02X)\n", probe, probe); probe = qib_sd7220_reg_mod(dd, IB_7220_SERDES, IB_CTRL2(chn), 0, 0); qib_dev_err(dd, "re-read: %d (%02X)\n", probe, probe); ret = qib_sd7220_reg_mod(dd, IB_7220_SERDES, IB_CTRL2(chn), 0x10, 0x10); if (ret < 0) qib_dev_err(dd, "Err on TRIMDONE rewrite1\n"); } } for (chn = 3; chn >= 0; --chn) { /* Read CTRL reg for each channel to check TRIMDONE */ if (baduns & (1 << chn)) { qib_dev_err(dd, "Resetting TRIMDONE on chn %d (%s)\n", chn, where); ret = qib_sd7220_reg_mod(dd, IB_7220_SERDES, IB_CTRL2(chn), 0x10, 0x10); if (ret < 0) qib_dev_err(dd, "Failed re-setting TRIMDONE, chn %d (%s)\n", chn, where); } } } /* * Below is portion of IBA7220-specific bringup_serdes() that actually * deals with registers and memory within the SerDes itself. * Post IB uC code version 1.32.17, was_reset being 1 is not really * informative, so we double-check. */ int qib_sd7220_init(struct qib_devdata *dd) { const struct firmware *fw; int ret = 1; /* default to failure */ int first_reset, was_reset; /* SERDES MPU reset recorded in D0 */ was_reset = (qib_read_kreg64(dd, kr_ibserdesctrl) & 1); if (!was_reset) { /* entered with reset not asserted, we need to do it */ qib_ibsd_reset(dd, 1); qib_sd_trimdone_monitor(dd, "Driver-reload"); } ret = request_firmware(&fw, SD7220_FW_NAME, &dd->pcidev->dev); if (ret) { qib_dev_err(dd, "Failed to load IB SERDES image\n"); goto done; } /* Substitute our deduced value for was_reset */ ret = qib_ibsd_ucode_loaded(dd->pport, fw); if (ret < 0) goto bail; first_reset = !ret; /* First reset if IBSD uCode not yet loaded */ /* * Alter some regs per vendor latest doc, reset-defaults * are not right for IB. */ ret = qib_sd_early(dd); if (ret < 0) { qib_dev_err(dd, "Failed to set IB SERDES early defaults\n"); goto bail; } /* * Set DAC manual trim IB. * We only do this once after chip has been reset (usually * same as once per system boot). */ if (first_reset) { ret = qib_sd_dactrim(dd); if (ret < 0) { qib_dev_err(dd, "Failed IB SERDES DAC trim\n"); goto bail; } } /* * Set various registers (DDS and RXEQ) that will be * controlled by IBC (in 1.2 mode) to reasonable preset values * Calling the "internal" version avoids the "check for needed" * and "trimdone monitor" that might be counter-productive. */ ret = qib_internal_presets(dd); if (ret < 0) { qib_dev_err(dd, "Failed to set IB SERDES presets\n"); goto bail; } ret = qib_sd_trimself(dd, 0x80); if (ret < 0) { qib_dev_err(dd, "Failed to set IB SERDES TRIMSELF\n"); goto bail; } /* Load image, then try to verify */ ret = 0; /* Assume success */ if (first_reset) { int vfy; int trim_done; ret = qib_sd7220_ib_load(dd, fw); if (ret < 0) { qib_dev_err(dd, "Failed to load IB SERDES image\n"); goto bail; } else { /* Loaded image, try to verify */ vfy = qib_sd7220_ib_vfy(dd, fw); if (vfy != ret) { qib_dev_err(dd, "SERDES PRAM VFY failed\n"); goto bail; } /* end if verified */ } /* end if loaded */ /* * Loaded and verified. Almost good... * hold "success" in ret */ ret = 0; /* * Prev steps all worked, continue bringup * De-assert RESET to uC, only in first reset, to allow * trimming. * * Since our default setup sets START_EQ1 to * PRESET, we need to clear that for this very first run. */ ret = ibsd_mod_allchnls(dd, START_EQ1(0), 0, 0x38); if (ret < 0) { qib_dev_err(dd, "Failed clearing START_EQ1\n"); goto bail; } qib_ibsd_reset(dd, 0); /* * If this is not the first reset, trimdone should be set * already. We may need to check about this. */ trim_done = qib_sd_trimdone_poll(dd); /* * Whether or not trimdone succeeded, we need to put the * uC back into reset to avoid a possible fight with the * IBC state-machine. */ qib_ibsd_reset(dd, 1); if (!trim_done) { qib_dev_err(dd, "No TRIMDONE seen\n"); goto bail; } /* * DEBUG: check each time we reset if trimdone bits have * gotten cleared, and re-set them. */ qib_sd_trimdone_monitor(dd, "First-reset"); /* Remember so we do not re-do the load, dactrim, etc. */ dd->cspec->serdes_first_init_done = 1; } /* * setup for channel training and load values for * RxEq and DDS in tables used by IBC in IB1.2 mode */ ret = 0; if (qib_sd_setvals(dd) >= 0) goto done; bail: ret = 1; done: /* start relock timer regardless, but start at 1 second */ set_7220_relock_poll(dd, -1); release_firmware(fw); return ret; } #define EPB_ACC_REQ 1 #define EPB_ACC_GNT 0x100 #define EPB_DATA_MASK 0xFF #define EPB_RD (1ULL << 24) #define EPB_TRANS_RDY (1ULL << 31) #define EPB_TRANS_ERR (1ULL << 30) #define EPB_TRANS_TRIES 5 /* * query, claim, release ownership of the EPB (External Parallel Bus) * for a specified SERDES. * the "claim" parameter is >0 to claim, <0 to release, 0 to query. * Returns <0 for errors, >0 if we had ownership, else 0. */ static int epb_access(struct qib_devdata *dd, int sdnum, int claim) { u16 acc; u64 accval; int owned = 0; u64 oct_sel = 0; switch (sdnum) { case IB_7220_SERDES: /* * The IB SERDES "ownership" is fairly simple. A single each * request/grant. */ acc = kr_ibsd_epb_access_ctrl; break; case PCIE_SERDES0: case PCIE_SERDES1: /* PCIe SERDES has two "octants", need to select which */ acc = kr_pciesd_epb_access_ctrl; oct_sel = (2 << (sdnum - PCIE_SERDES0)); break; default: return 0; } /* Make sure any outstanding transaction was seen */ qib_read_kreg32(dd, kr_scratch); udelay(15); accval = qib_read_kreg32(dd, acc); owned = !!(accval & EPB_ACC_GNT); if (claim < 0) { /* Need to release */ u64 pollval; /* * The only writeable bits are the request and CS. * Both should be clear */ u64 newval = 0; qib_write_kreg(dd, acc, newval); /* First read after write is not trustworthy */ pollval = qib_read_kreg32(dd, acc); udelay(5); pollval = qib_read_kreg32(dd, acc); if (pollval & EPB_ACC_GNT) owned = -1; } else if (claim > 0) { /* Need to claim */ u64 pollval; u64 newval = EPB_ACC_REQ | oct_sel; qib_write_kreg(dd, acc, newval); /* First read after write is not trustworthy */ pollval = qib_read_kreg32(dd, acc); udelay(5); pollval = qib_read_kreg32(dd, acc); if (!(pollval & EPB_ACC_GNT)) owned = -1; } return owned; } /* * Lemma to deal with race condition of write..read to epb regs */ static int epb_trans(struct qib_devdata *dd, u16 reg, u64 i_val, u64 *o_vp) { int tries; u64 transval; qib_write_kreg(dd, reg, i_val); /* Throw away first read, as RDY bit may be stale */ transval = qib_read_kreg64(dd, reg); for (tries = EPB_TRANS_TRIES; tries; --tries) { transval = qib_read_kreg32(dd, reg); if (transval & EPB_TRANS_RDY) break; udelay(5); } if (transval & EPB_TRANS_ERR) return -1; if (tries > 0 && o_vp) *o_vp = transval; return tries; } /** * qib_sd7220_reg_mod - modify SERDES register * @dd: the qlogic_ib device * @sdnum: which SERDES to access * @loc: location - channel, element, register, as packed by EPB_LOC() macro. * @wd: Write Data - value to set in register * @mask: ones where data should be spliced into reg. * * Basic register read/modify/write, with un-needed acesses elided. That is, * a mask of zero will prevent write, while a mask of 0xFF will prevent read. * returns current (presumed, if a write was done) contents of selected * register, or <0 if errors. */ static int qib_sd7220_reg_mod(struct qib_devdata *dd, int sdnum, u32 loc, u32 wd, u32 mask) { u16 trans; u64 transval; int owned; int tries, ret; unsigned long flags; switch (sdnum) { case IB_7220_SERDES: trans = kr_ibsd_epb_transaction_reg; break; case PCIE_SERDES0: case PCIE_SERDES1: trans = kr_pciesd_epb_transaction_reg; break; default: return -1; } /* * All access is locked in software (vs other host threads) and * hardware (vs uC access). */ spin_lock_irqsave(&dd->cspec->sdepb_lock, flags); owned = epb_access(dd, sdnum, 1); if (owned < 0) { spin_unlock_irqrestore(&dd->cspec->sdepb_lock, flags); return -1; } ret = 0; for (tries = EPB_TRANS_TRIES; tries; --tries) { transval = qib_read_kreg32(dd, trans); if (transval & EPB_TRANS_RDY) break; udelay(5); } if (tries > 0) { tries = 1; /* to make read-skip work */ if (mask != 0xFF) { /* * Not a pure write, so need to read. * loc encodes chip-select as well as address */ transval = loc | EPB_RD; tries = epb_trans(dd, trans, transval, &transval); } if (tries > 0 && mask != 0) { /* * Not a pure read, so need to write. */ wd = (wd & mask) | (transval & ~mask); transval = loc | (wd & EPB_DATA_MASK); tries = epb_trans(dd, trans, transval, &transval); } } /* else, failed to see ready, what error-handling? */ /* * Release bus. Failure is an error. */ if (epb_access(dd, sdnum, -1) < 0) ret = -1; else ret = transval & EPB_DATA_MASK; spin_unlock_irqrestore(&dd->cspec->sdepb_lock, flags); if (tries <= 0) ret = -1; return ret; } #define EPB_ROM_R (2) #define EPB_ROM_W (1) /* * Below, all uC-related, use appropriate UC_CS, depending * on which SerDes is used. */ #define EPB_UC_CTL EPB_LOC(6, 0, 0) #define EPB_MADDRL EPB_LOC(6, 0, 2) #define EPB_MADDRH EPB_LOC(6, 0, 3) #define EPB_ROMDATA EPB_LOC(6, 0, 4) #define EPB_RAMDATA EPB_LOC(6, 0, 5) /* Transfer date to/from uC Program RAM of IB or PCIe SerDes */ static int qib_sd7220_ram_xfer(struct qib_devdata *dd, int sdnum, u32 loc, u8 *buf, int cnt, int rd_notwr) { u16 trans; u64 transval; u64 csbit; int owned; int tries; int sofar; int addr; int ret; unsigned long flags; /* Pick appropriate transaction reg and "Chip select" for this serdes */ switch (sdnum) { case IB_7220_SERDES: csbit = 1ULL << EPB_IB_UC_CS_SHF; trans = kr_ibsd_epb_transaction_reg; break; case PCIE_SERDES0: case PCIE_SERDES1: /* PCIe SERDES has uC "chip select" in different bit, too */ csbit = 1ULL << EPB_PCIE_UC_CS_SHF; trans = kr_pciesd_epb_transaction_reg; break; default: return -1; } spin_lock_irqsave(&dd->cspec->sdepb_lock, flags); owned = epb_access(dd, sdnum, 1); if (owned < 0) { spin_unlock_irqrestore(&dd->cspec->sdepb_lock, flags); return -1; } /* * In future code, we may need to distinguish several address ranges, * and select various memories based on this. For now, just trim * "loc" (location including address and memory select) to * "addr" (address within memory). we will only support PRAM * The memory is 8KB. */ addr = loc & 0x1FFF; for (tries = EPB_TRANS_TRIES; tries; --tries) { transval = qib_read_kreg32(dd, trans); if (transval & EPB_TRANS_RDY) break; udelay(5); } sofar = 0; if (tries > 0) { /* * Every "memory" access is doubly-indirect. * We set two bytes of address, then read/write * one or mores bytes of data. */ /* First, we set control to "Read" or "Write" */ transval = csbit | EPB_UC_CTL | (rd_notwr ? EPB_ROM_R : EPB_ROM_W); tries = epb_trans(dd, trans, transval, &transval); while (tries > 0 && sofar < cnt) { if (!sofar) { /* Only set address at start of chunk */ int addrbyte = (addr + sofar) >> 8; transval = csbit | EPB_MADDRH | addrbyte; tries = epb_trans(dd, trans, transval, &transval); if (tries <= 0) break; addrbyte = (addr + sofar) & 0xFF; transval = csbit | EPB_MADDRL | addrbyte; tries = epb_trans(dd, trans, transval, &transval); if (tries <= 0) break; } if (rd_notwr) transval = csbit | EPB_ROMDATA | EPB_RD; else transval = csbit | EPB_ROMDATA | buf[sofar]; tries = epb_trans(dd, trans, transval, &transval); if (tries <= 0) break; if (rd_notwr) buf[sofar] = transval & EPB_DATA_MASK; ++sofar; } /* Finally, clear control-bit for Read or Write */ transval = csbit | EPB_UC_CTL; tries = epb_trans(dd, trans, transval, &transval); } ret = sofar; /* Release bus. Failure is an error */ if (epb_access(dd, sdnum, -1) < 0) ret = -1; spin_unlock_irqrestore(&dd->cspec->sdepb_lock, flags); if (tries <= 0) ret = -1; return ret; } #define PROG_CHUNK 64 static int qib_sd7220_prog_ld(struct qib_devdata *dd, int sdnum, const u8 *img, int len, int offset) { int cnt, sofar, req; sofar = 0; while (sofar < len) { req = len - sofar; if (req > PROG_CHUNK) req = PROG_CHUNK; cnt = qib_sd7220_ram_xfer(dd, sdnum, offset + sofar, (u8 *)img + sofar, req, 0); if (cnt < req) { sofar = -1; break; } sofar += req; } return sofar; } #define VFY_CHUNK 64 #define SD_PRAM_ERROR_LIMIT 42 static int qib_sd7220_prog_vfy(struct qib_devdata *dd, int sdnum, const u8 *img, int len, int offset) { int cnt, sofar, req, idx, errors; unsigned char readback[VFY_CHUNK]; errors = 0; sofar = 0; while (sofar < len) { req = len - sofar; if (req > VFY_CHUNK) req = VFY_CHUNK; cnt = qib_sd7220_ram_xfer(dd, sdnum, sofar + offset, readback, req, 1); if (cnt < req) { /* failed in read itself */ sofar = -1; break; } for (idx = 0; idx < cnt; ++idx) { if (readback[idx] != img[idx+sofar]) ++errors; } sofar += cnt; } return errors ? -errors : sofar; } static int qib_sd7220_ib_load(struct qib_devdata *dd, const struct firmware *fw) { return qib_sd7220_prog_ld(dd, IB_7220_SERDES, fw->data, fw->size, 0); } static int qib_sd7220_ib_vfy(struct qib_devdata *dd, const struct firmware *fw) { return qib_sd7220_prog_vfy(dd, IB_7220_SERDES, fw->data, fw->size, 0); } /* * IRQ not set up at this point in init, so we poll. */ #define IB_SERDES_TRIM_DONE (1ULL << 11) #define TRIM_TMO (15) static int qib_sd_trimdone_poll(struct qib_devdata *dd) { int trim_tmo, ret; uint64_t val; /* * Default to failure, so IBC will not start * without IB_SERDES_TRIM_DONE. */ ret = 0; for (trim_tmo = 0; trim_tmo < TRIM_TMO; ++trim_tmo) { val = qib_read_kreg64(dd, kr_ibcstatus); if (val & IB_SERDES_TRIM_DONE) { ret = 1; break; } msleep(20); } if (trim_tmo >= TRIM_TMO) { qib_dev_err(dd, "No TRIMDONE in %d tries\n", trim_tmo); ret = 0; } return ret; } #define TX_FAST_ELT (9) /* * Set the "negotiation" values for SERDES. These are used by the IB1.2 * link negotiation. Macros below are attempt to keep the values a * little more human-editable. * First, values related to Drive De-emphasis Settings. */ #define NUM_DDS_REGS 6 #define DDS_REG_MAP 0x76A910 /* LSB-first list of regs (in elt 9) to mod */ #define DDS_VAL(amp_d, main_d, ipst_d, ipre_d, amp_s, main_s, ipst_s, ipre_s) \ { { ((amp_d & 0x1F) << 1) | 1, ((amp_s & 0x1F) << 1) | 1, \ (main_d << 3) | 4 | (ipre_d >> 2), \ (main_s << 3) | 4 | (ipre_s >> 2), \ ((ipst_d & 0xF) << 1) | ((ipre_d & 3) << 6) | 0x21, \ ((ipst_s & 0xF) << 1) | ((ipre_s & 3) << 6) | 0x21 } } static struct dds_init { uint8_t reg_vals[NUM_DDS_REGS]; } dds_init_vals[] = { /* DDR(FDR) SDR(HDR) */ /* Vendor recommends below for 3m cable */ #define DDS_3M 0 DDS_VAL(31, 19, 12, 0, 29, 22, 9, 0), DDS_VAL(31, 12, 15, 4, 31, 15, 15, 1), DDS_VAL(31, 13, 15, 3, 31, 16, 15, 0), DDS_VAL(31, 14, 15, 2, 31, 17, 14, 0), DDS_VAL(31, 15, 15, 1, 31, 18, 13, 0), DDS_VAL(31, 16, 15, 0, 31, 19, 12, 0), DDS_VAL(31, 17, 14, 0, 31, 20, 11, 0), DDS_VAL(31, 18, 13, 0, 30, 21, 10, 0), DDS_VAL(31, 20, 11, 0, 28, 23, 8, 0), DDS_VAL(31, 21, 10, 0, 27, 24, 7, 0), DDS_VAL(31, 22, 9, 0, 26, 25, 6, 0), DDS_VAL(30, 23, 8, 0, 25, 26, 5, 0), DDS_VAL(29, 24, 7, 0, 23, 27, 4, 0), /* Vendor recommends below for 1m cable */ #define DDS_1M 13 DDS_VAL(28, 25, 6, 0, 21, 28, 3, 0), DDS_VAL(27, 26, 5, 0, 19, 29, 2, 0), DDS_VAL(25, 27, 4, 0, 17, 30, 1, 0) }; /* * Now the RXEQ section of the table. */ /* Hardware packs an element number and register address thus: */ #define RXEQ_INIT_RDESC(elt, addr) (((elt) & 0xF) | ((addr) << 4)) #define RXEQ_VAL(elt, adr, val0, val1, val2, val3) \ {RXEQ_INIT_RDESC((elt), (adr)), {(val0), (val1), (val2), (val3)} } #define RXEQ_VAL_ALL(elt, adr, val) \ {RXEQ_INIT_RDESC((elt), (adr)), {(val), (val), (val), (val)} } #define RXEQ_SDR_DFELTH 0 #define RXEQ_SDR_TLTH 0 #define RXEQ_SDR_G1CNT_Z1CNT 0x11 #define RXEQ_SDR_ZCNT 23 static struct rxeq_init { u16 rdesc; /* in form used in SerDesDDSRXEQ */ u8 rdata[4]; } rxeq_init_vals[] = { /* Set Rcv Eq. to Preset node */ RXEQ_VAL_ALL(7, 0x27, 0x10), /* Set DFELTHFDR/HDR thresholds */ RXEQ_VAL(7, 8, 0, 0, 0, 0), /* FDR, was 0, 1, 2, 3 */ RXEQ_VAL(7, 0x21, 0, 0, 0, 0), /* HDR */ /* Set TLTHFDR/HDR theshold */ RXEQ_VAL(7, 9, 2, 2, 2, 2), /* FDR, was 0, 2, 4, 6 */ RXEQ_VAL(7, 0x23, 2, 2, 2, 2), /* HDR, was 0, 1, 2, 3 */ /* Set Preamp setting 2 (ZFR/ZCNT) */ RXEQ_VAL(7, 0x1B, 12, 12, 12, 12), /* FDR, was 12, 16, 20, 24 */ RXEQ_VAL(7, 0x1C, 12, 12, 12, 12), /* HDR, was 12, 16, 20, 24 */ /* Set Preamp DC gain and Setting 1 (GFR/GHR) */ RXEQ_VAL(7, 0x1E, 16, 16, 16, 16), /* FDR, was 16, 17, 18, 20 */ RXEQ_VAL(7, 0x1F, 16, 16, 16, 16), /* HDR, was 16, 17, 18, 20 */ /* Toggle RELOCK (in VCDL_CTRL0) to lock to data */ RXEQ_VAL_ALL(6, 6, 0x20), /* Set D5 High */ RXEQ_VAL_ALL(6, 6, 0), /* Set D5 Low */ }; /* There are 17 values from vendor, but IBC only accesses the first 16 */ #define DDS_ROWS (16) #define RXEQ_ROWS ARRAY_SIZE(rxeq_init_vals) static int qib_sd_setvals(struct qib_devdata *dd) { int idx, midx; int min_idx; /* Minimum index for this portion of table */ uint32_t dds_reg_map; u64 __iomem *taddr, *iaddr; uint64_t data; uint64_t sdctl; taddr = dd->kregbase + kr_serdes_maptable; iaddr = dd->kregbase + kr_serdes_ddsrxeq0; /* * Init the DDS section of the table. * Each "row" of the table provokes NUM_DDS_REG writes, to the * registers indicated in DDS_REG_MAP. */ sdctl = qib_read_kreg64(dd, kr_ibserdesctrl); sdctl = (sdctl & ~(0x1f << 8)) | (NUM_DDS_REGS << 8); sdctl = (sdctl & ~(0x1f << 13)) | (RXEQ_ROWS << 13); qib_write_kreg(dd, kr_ibserdesctrl, sdctl); /* * Iterate down table within loop for each register to store. */ dds_reg_map = DDS_REG_MAP; for (idx = 0; idx < NUM_DDS_REGS; ++idx) { data = ((dds_reg_map & 0xF) << 4) | TX_FAST_ELT; writeq(data, iaddr + idx); qib_read_kreg32(dd, kr_scratch); dds_reg_map >>= 4; for (midx = 0; midx < DDS_ROWS; ++midx) { u64 __iomem *daddr = taddr + ((midx << 4) + idx); data = dds_init_vals[midx].reg_vals[idx]; writeq(data, daddr); qib_read_kreg32(dd, kr_scratch); } /* End inner for (vals for this reg, each row) */ } /* end outer for (regs to be stored) */ /* * Init the RXEQ section of the table. * This runs in a different order, as the pattern of * register references is more complex, but there are only * four "data" values per register. */ min_idx = idx; /* RXEQ indices pick up where DDS left off */ taddr += 0x100; /* RXEQ data is in second half of table */ /* Iterate through RXEQ register addresses */ for (idx = 0; idx < RXEQ_ROWS; ++idx) { int didx; /* "destination" */ int vidx; /* didx is offset by min_idx to address RXEQ range of regs */ didx = idx + min_idx; /* Store the next RXEQ register address */ writeq(rxeq_init_vals[idx].rdesc, iaddr + didx); qib_read_kreg32(dd, kr_scratch); /* Iterate through RXEQ values */ for (vidx = 0; vidx < 4; vidx++) { data = rxeq_init_vals[idx].rdata[vidx]; writeq(data, taddr + (vidx << 6) + idx); qib_read_kreg32(dd, kr_scratch); } } /* end outer for (Reg-writes for RXEQ) */ return 0; } #define CMUCTRL5 EPB_LOC(7, 0, 0x15) #define RXHSCTRL0(chan) EPB_LOC(chan, 6, 0) #define VCDL_DAC2(chan) EPB_LOC(chan, 6, 5) #define VCDL_CTRL0(chan) EPB_LOC(chan, 6, 6) #define VCDL_CTRL2(chan) EPB_LOC(chan, 6, 8) #define START_EQ2(chan) EPB_LOC(chan, 7, 0x28) /* * Repeat a "store" across all channels of the IB SerDes. * Although nominally it inherits the "read value" of the last * channel it modified, the only really useful return is <0 for * failure, >= 0 for success. The parameter 'loc' is assumed to * be the location in some channel of the register to be modified * The caller can specify use of the "gang write" option of EPB, * in which case we use the specified channel data for any fields * not explicitely written. */ static int ibsd_mod_allchnls(struct qib_devdata *dd, int loc, int val, int mask) { int ret = -1; int chnl; if (loc & EPB_GLOBAL_WR) { /* * Our caller has assured us that we can set all four * channels at once. Trust that. If mask is not 0xFF, * we will read the _specified_ channel for our starting * value. */ loc |= (1U << EPB_IB_QUAD0_CS_SHF); chnl = (loc >> (4 + EPB_ADDR_SHF)) & 7; if (mask != 0xFF) { ret = qib_sd7220_reg_mod(dd, IB_7220_SERDES, loc & ~EPB_GLOBAL_WR, 0, 0); if (ret < 0) { int sloc = loc >> EPB_ADDR_SHF; qib_dev_err(dd, "pre-read failed: elt %d, addr 0x%X, chnl %d\n", (sloc & 0xF), (sloc >> 9) & 0x3f, chnl); return ret; } val = (ret & ~mask) | (val & mask); } loc &= ~(7 << (4+EPB_ADDR_SHF)); ret = qib_sd7220_reg_mod(dd, IB_7220_SERDES, loc, val, 0xFF); if (ret < 0) { int sloc = loc >> EPB_ADDR_SHF; qib_dev_err(dd, "Global WR failed: elt %d, addr 0x%X, val %02X\n", (sloc & 0xF), (sloc >> 9) & 0x3f, val); } return ret; } /* Clear "channel" and set CS so we can simply iterate */ loc &= ~(7 << (4+EPB_ADDR_SHF)); loc |= (1U << EPB_IB_QUAD0_CS_SHF); for (chnl = 0; chnl < 4; ++chnl) { int cloc = loc | (chnl << (4+EPB_ADDR_SHF)); ret = qib_sd7220_reg_mod(dd, IB_7220_SERDES, cloc, val, mask); if (ret < 0) { int sloc = loc >> EPB_ADDR_SHF; qib_dev_err(dd, "Write failed: elt %d, addr 0x%X, chnl %d, val 0x%02X, mask 0x%02X\n", (sloc & 0xF), (sloc >> 9) & 0x3f, chnl, val & 0xFF, mask & 0xFF); break; } } return ret; } /* * Set the Tx values normally modified by IBC in IB1.2 mode to default * values, as gotten from first row of init table. */ static int set_dds_vals(struct qib_devdata *dd, struct dds_init *ddi) { int ret; int idx, reg, data; uint32_t regmap; regmap = DDS_REG_MAP; for (idx = 0; idx < NUM_DDS_REGS; ++idx) { reg = (regmap & 0xF); regmap >>= 4; data = ddi->reg_vals[idx]; /* Vendor says RMW not needed for these regs, use 0xFF mask */ ret = ibsd_mod_allchnls(dd, EPB_LOC(0, 9, reg), data, 0xFF); if (ret < 0) break; } return ret; } /* * Set the Rx values normally modified by IBC in IB1.2 mode to default * values, as gotten from selected column of init table. */ static int set_rxeq_vals(struct qib_devdata *dd, int vsel) { int ret; int ridx; int cnt = ARRAY_SIZE(rxeq_init_vals); for (ridx = 0; ridx < cnt; ++ridx) { int elt, reg, val, loc; elt = rxeq_init_vals[ridx].rdesc & 0xF; reg = rxeq_init_vals[ridx].rdesc >> 4; loc = EPB_LOC(0, elt, reg); val = rxeq_init_vals[ridx].rdata[vsel]; /* mask of 0xFF, because hardware does full-byte store. */ ret = ibsd_mod_allchnls(dd, loc, val, 0xFF); if (ret < 0) break; } return ret; } /* * Set the default values (row 0) for DDR Driver Demphasis. * we do this initially and whenever we turn off IB-1.2 * * The "default" values for Rx equalization are also stored to * SerDes registers. Formerly (and still default), we used set 2. * For experimenting with cables and link-partners, we allow changing * that via a module parameter. */ static unsigned qib_rxeq_set = 2; module_param_named(rxeq_default_set, qib_rxeq_set, uint, S_IWUSR | S_IRUGO); MODULE_PARM_DESC(rxeq_default_set, "Which set [0..3] of Rx Equalization values is default"); static int qib_internal_presets(struct qib_devdata *dd) { int ret = 0; ret = set_dds_vals(dd, dds_init_vals + DDS_3M); if (ret < 0) qib_dev_err(dd, "Failed to set default DDS values\n"); ret = set_rxeq_vals(dd, qib_rxeq_set & 3); if (ret < 0) qib_dev_err(dd, "Failed to set default RXEQ values\n"); return ret; } int qib_sd7220_presets(struct qib_devdata *dd) { int ret = 0; if (!dd->cspec->presets_needed) return ret; dd->cspec->presets_needed = 0; /* Assert uC reset, so we don't clash with it. */ qib_ibsd_reset(dd, 1); udelay(2); qib_sd_trimdone_monitor(dd, "link-down"); ret = qib_internal_presets(dd); return ret; } static int qib_sd_trimself(struct qib_devdata *dd, int val) { int loc = CMUCTRL5 | (1U << EPB_IB_QUAD0_CS_SHF); return qib_sd7220_reg_mod(dd, IB_7220_SERDES, loc, val, 0xFF); } static int qib_sd_early(struct qib_devdata *dd) { int ret; ret = ibsd_mod_allchnls(dd, RXHSCTRL0(0) | EPB_GLOBAL_WR, 0xD4, 0xFF); if (ret < 0) goto bail; ret = ibsd_mod_allchnls(dd, START_EQ1(0) | EPB_GLOBAL_WR, 0x10, 0xFF); if (ret < 0) goto bail; ret = ibsd_mod_allchnls(dd, START_EQ2(0) | EPB_GLOBAL_WR, 0x30, 0xFF); bail: return ret; } #define BACTRL(chnl) EPB_LOC(chnl, 6, 0x0E) #define LDOUTCTRL1(chnl) EPB_LOC(chnl, 7, 6) #define RXHSSTATUS(chnl) EPB_LOC(chnl, 6, 0xF) static int qib_sd_dactrim(struct qib_devdata *dd) { int ret; ret = ibsd_mod_allchnls(dd, VCDL_DAC2(0) | EPB_GLOBAL_WR, 0x2D, 0xFF); if (ret < 0) goto bail; /* more fine-tuning of what will be default */ ret = ibsd_mod_allchnls(dd, VCDL_CTRL2(0), 3, 0xF); if (ret < 0) goto bail; ret = ibsd_mod_allchnls(dd, BACTRL(0) | EPB_GLOBAL_WR, 0x40, 0xFF); if (ret < 0) goto bail; ret = ibsd_mod_allchnls(dd, LDOUTCTRL1(0) | EPB_GLOBAL_WR, 0x04, 0xFF); if (ret < 0) goto bail; ret = ibsd_mod_allchnls(dd, RXHSSTATUS(0) | EPB_GLOBAL_WR, 0x04, 0xFF); if (ret < 0) goto bail; /* * Delay for max possible number of steps, with slop. * Each step is about 4usec. */ udelay(415); ret = ibsd_mod_allchnls(dd, LDOUTCTRL1(0) | EPB_GLOBAL_WR, 0x00, 0xFF); bail: return ret; } #define RELOCK_FIRST_MS 3 #define RXLSPPM(chan) EPB_LOC(chan, 0, 2) void toggle_7220_rclkrls(struct qib_devdata *dd) { int loc = RXLSPPM(0) | EPB_GLOBAL_WR; int ret; ret = ibsd_mod_allchnls(dd, loc, 0, 0x80); if (ret < 0) qib_dev_err(dd, "RCLKRLS failed to clear D7\n"); else { udelay(1); ibsd_mod_allchnls(dd, loc, 0x80, 0x80); } /* And again for good measure */ udelay(1); ret = ibsd_mod_allchnls(dd, loc, 0, 0x80); if (ret < 0) qib_dev_err(dd, "RCLKRLS failed to clear D7\n"); else { udelay(1); ibsd_mod_allchnls(dd, loc, 0x80, 0x80); } /* Now reset xgxs and IBC to complete the recovery */ dd->f_xgxs_reset(dd->pport); } /* * Shut down the timer that polls for relock occasions, if needed * this is "hooked" from qib_7220_quiet_serdes(), which is called * just before qib_shutdown_device() in qib_driver.c shuts down all * the other timers */ void shutdown_7220_relock_poll(struct qib_devdata *dd) { if (dd->cspec->relock_timer_active) del_timer_sync(&dd->cspec->relock_timer); } static unsigned qib_relock_by_timer = 1; module_param_named(relock_by_timer, qib_relock_by_timer, uint, S_IWUSR | S_IRUGO); MODULE_PARM_DESC(relock_by_timer, "Allow relock attempt if link not up"); static void qib_run_relock(struct timer_list *t) { struct qib_chip_specific *cs = from_timer(cs, t, relock_timer); struct qib_devdata *dd = cs->dd; struct qib_pportdata *ppd = dd->pport; int timeoff; /* * Check link-training state for "stuck" state, when down. * if found, try relock and schedule another try at * exponentially growing delay, maxed at one second. * if not stuck, our work is done. */ if ((dd->flags & QIB_INITTED) && !(ppd->lflags & (QIBL_IB_AUTONEG_INPROG | QIBL_LINKINIT | QIBL_LINKARMED | QIBL_LINKACTIVE))) { if (qib_relock_by_timer) { if (!(ppd->lflags & QIBL_IB_LINK_DISABLED)) toggle_7220_rclkrls(dd); } /* re-set timer for next check */ timeoff = cs->relock_interval << 1; if (timeoff > HZ) timeoff = HZ; cs->relock_interval = timeoff; } else timeoff = HZ; mod_timer(&cs->relock_timer, jiffies + timeoff); } void set_7220_relock_poll(struct qib_devdata *dd, int ibup) { struct qib_chip_specific *cs = dd->cspec; if (ibup) { /* We are now up, relax timer to 1 second interval */ if (cs->relock_timer_active) { cs->relock_interval = HZ; mod_timer(&cs->relock_timer, jiffies + HZ); } } else { /* Transition to down, (re-)set timer to short interval. */ unsigned int timeout; timeout = msecs_to_jiffies(RELOCK_FIRST_MS); if (timeout == 0) timeout = 1; /* If timer has not yet been started, do so. */ if (!cs->relock_timer_active) { cs->relock_timer_active = 1; timer_setup(&cs->relock_timer, qib_run_relock, 0); cs->relock_interval = timeout; cs->relock_timer.expires = jiffies + timeout; add_timer(&cs->relock_timer); } else { cs->relock_interval = timeout; mod_timer(&cs->relock_timer, jiffies + timeout); } } }