IB/ipath: Support for SerDes portion of IBA7220

The control and initialization of the SerDes blocks of the IBA7220 is
sufficiently complex to merit a separate file.
Signed-off-by: Michael Albaugh <Michael.Albaugh@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/ipath/ipath_sd7220.c

+/*
+ * Copyright (c) 2006, 2007, 2008 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 InfiniPath 7220 chip.
+ */
+
+#include <linux/pci.h>
+#include <linux/delay.h>
+
+#include "ipath_kernel.h"
+#include "ipath_registers.h"
+#include "ipath_7220.h"
+
+/*
+ * The IBSerDesMappTable is a memory that holds values to be stored in
+ * various SerDes registers by IBC. It is not part of the normal kregs
+ * map and is used in exactly one place, hence the #define below.
+ */
+#define KR_IBSerDesMappTable (0x94000 / (sizeof(uint64_t)))
+
+/*
+ * 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 ipath_sd7220_reg_mod(struct ipath_devdata *dd, int sdnum, u32 loc,
+				u32 data, u32 mask);
+static int ibsd_mod_allchnls(struct ipath_devdata *dd, int loc, int val,
+			     int mask);
+static int ipath_sd_trimdone_poll(struct ipath_devdata *dd);
+static void ipath_sd_trimdone_monitor(struct ipath_devdata *dd,
+				      const char *where);
+static int ipath_sd_setvals(struct ipath_devdata *dd);
+static int ipath_sd_early(struct ipath_devdata *dd);
+static int ipath_sd_dactrim(struct ipath_devdata *dd);
+/* Set the registers that IBC may muck with to their default "preset" values */
+int ipath_sd7220_presets(struct ipath_devdata *dd);
+static int ipath_internal_presets(struct ipath_devdata *dd);
+/* Tweak the register (CMUCTRL5) that contains the TRIMSELF controls */
+static int ipath_sd_trimself(struct ipath_devdata *dd, int val);
+static int epb_access(struct ipath_devdata *dd, int sdnum, int claim);
+
+void ipath_set_relock_poll(struct ipath_devdata *dd, int ibup);
+
+/*
+ * 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", as reflected in was_reset parameter to
+ * ipath_sd7220_init() is no longer valid. Instead, we check for the
+ * actual uC code having been loaded.
+ */
+static int ipath_ibsd_ucode_loaded(struct ipath_devdata *dd)
+{
+	if (!dd->serdes_first_init_done && (ipath_sd7220_ib_vfy(dd) > 0))
+		dd->serdes_first_init_done = 1;
+	return dd->serdes_first_init_done;
+}
+
+/* repeat #define for local use. "Real" #define is in ipath_iba7220.c */
+#define INFINIPATH_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 ipath_sd7220_clr_ibpar(struct ipath_devdata *dd)
+{
+	int ret;
+
+	/* clear, then re-enable parity errs */
+	ret = ipath_sd7220_reg_mod(dd, IB_7220_SERDES, IB_MPREG6,
+		UC_PAR_CLR_D, UC_PAR_CLR_M);
+	if (ret < 0) {
+		ipath_dev_err(dd, "Failed clearing IBSerDes Parity err\n");
+		goto bail;
+	}
+	ret = ipath_sd7220_reg_mod(dd, IB_7220_SERDES, IB_MPREG6, 0,
+		UC_PAR_CLR_M);
+
+	ipath_read_kreg32(dd, dd->ipath_kregs->kr_scratch);
+	udelay(4);
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrclear,
+		INFINIPATH_HWE_IB_UC_MEMORYPARITYERR);
+	ipath_read_kreg32(dd, dd->ipath_kregs->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 ipath_resync_ibepb(struct ipath_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 = ipath_sd7220_reg_mod(dd, IB_7220_SERDES, loc, 0, 0);
+		if (ret < 0) {
+			ipath_dev_err(dd, "Failed read in resync\n");
+			continue;
+		}
+		if (ret != 0xF0 && ret != 0x55 && tries == 0)
+			ipath_dev_err(dd, "unexpected pattern in resync\n");
+		pat = ret ^ 0xA5; /* alternate F0 and 55 */
+		ret = ipath_sd7220_reg_mod(dd, IB_7220_SERDES, loc, pat, 0xFF);
+		if (ret < 0) {
+			ipath_dev_err(dd, "Failed write in resync\n");
+			continue;
+		}
+		ret = ipath_sd7220_reg_mod(dd, IB_7220_SERDES, loc, 0, 0);
+		if (ret < 0) {
+			ipath_dev_err(dd, "Failed re-read in resync\n");
+			continue;
+		}
+		if (ret != pat) {
+			ipath_dev_err(dd, "Failed compare1 in resync\n");
+			continue;
+		}
+		loc = IB_CMUDONE(chn);
+		ret = ipath_sd7220_reg_mod(dd, IB_7220_SERDES, loc, 0, 0);
+		if (ret < 0) {
+			ipath_dev_err(dd, "Failed CMUDONE rd in resync\n");
+			continue;
+		}
+		if ((ret & 0x70) != ((chn << 4) | 0x40)) {
+			ipath_dev_err(dd, "Bad CMUDONE value %02X, chn %d\n",
+				ret, chn);
+			continue;
+		}
+		if (++chn == 4)
+			break;  /* Success */
+	}
+	ipath_cdbg(VERBOSE, "Resync in %d tries\n", tries);
+	return (ret > 0) ? 0 : ret;
+}
+
+/*
+ * Localize the stuff that should be done to change IB uC reset
+ * returns <0 for errors.
+ */
+static int ipath_ibsd_reset(struct ipath_devdata *dd, int assert_rst)
+{
+	u64 rst_val;
+	int ret = 0;
+	unsigned long flags;
+
+	rst_val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_ibserdesctrl);
+	if (assert_rst) {
+		/*
+		 * Vendor recommends "interrupting" uC before reset, to
+		 * minimize possible glitches.
+		 */
+		spin_lock_irqsave(&dd->ipath_sdepb_lock, flags);
+		epb_access(dd, IB_7220_SERDES, 1);
+		rst_val |= 1ULL;
+		/* Squelch possible parity error from _asserting_ reset */
+		ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrmask,
+			dd->ipath_hwerrmask &
+			~INFINIPATH_HWE_IB_UC_MEMORYPARITYERR);
+		ipath_write_kreg(dd, dd->ipath_kregs->kr_ibserdesctrl, rst_val);
+		/* flush write, delay to ensure it took effect */
+		ipath_read_kreg32(dd, dd->ipath_kregs->kr_scratch);
+		udelay(2);
+		/* once it's reset, can remove interrupt */
+		epb_access(dd, IB_7220_SERDES, -1);
+		spin_unlock_irqrestore(&dd->ipath_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);
+		ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrmask,
+			dd->ipath_hwerrmask &
+			~INFINIPATH_HWE_IB_UC_MEMORYPARITYERR);
+
+		ret = ipath_resync_ibepb(dd);
+		if (ret < 0)
+			ipath_dev_err(dd, "unable to re-sync IB EPB\n");
+
+		/* set uC control regs to suppress parity errs */
+		ret = ipath_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 = ipath_sd7220_reg_mod(dd, IB_7220_SERDES, IB_MPREG6, 0x80,
+			0x80);
+		if (ret < 0) {
+			ipath_dev_err(dd, "Failed to set WDOG disable\n");
+			goto bail;
+		}
+		ipath_write_kreg(dd, dd->ipath_kregs->kr_ibserdesctrl, rst_val);
+		/* flush write, delay for startup */
+		ipath_read_kreg32(dd, dd->ipath_kregs->kr_scratch);
+		udelay(1);
+		/* clear, then re-enable parity errs */
+		ipath_sd7220_clr_ibpar(dd);
+		val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_hwerrstatus);
+		if (val & INFINIPATH_HWE_IB_UC_MEMORYPARITYERR) {
+			ipath_dev_err(dd, "IBUC Parity still set after RST\n");
+			dd->ipath_hwerrmask &=
+				~INFINIPATH_HWE_IB_UC_MEMORYPARITYERR;
+		}
+		ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrmask,
+			dd->ipath_hwerrmask);
+	}
+
+bail:
+	return ret;
+}
+
+static void ipath_sd_trimdone_monitor(struct ipath_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 = ipath_resync_ibepb(dd);
+	if (ret < 0)
+		ipath_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 = ipath_sd7220_reg_mod(dd, IB_7220_SERDES, IB_CTRL2(0), 0, 0);
+	if (ret < 0)
+		ipath_dev_err(dd, "Failed TRIMDONE 1st read, (%s)\n", where);
+
+	/* Check/show "summary" Trim-done bit in IBCStatus */
+	val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_ibcstatus);
+	if (val & (1ULL << 11))
+		ipath_cdbg(VERBOSE, "IBCS TRIMDONE set (%s)\n", where);
+	else
+		ipath_dev_err(dd, "IBCS TRIMDONE clear (%s)\n", where);
+
+	udelay(2);
+
+	ret = ipath_sd7220_reg_mod(dd, IB_7220_SERDES, IB_MPREG6, 0x80, 0x80);
+	if (ret < 0)
+		ipath_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 = ipath_sd7220_reg_mod(dd, IB_7220_SERDES,
+			IB_CTRL2(chn), 0, 0);
+		if (ret < 0)
+			ipath_dev_err(dd, "Failed checking TRIMDONE, chn %d"
+				" (%s)\n", chn, where);
+
+		if (!(ret & 0x10)) {
+			int probe;
+			baduns |= (1 << chn);
+			ipath_dev_err(dd, "TRIMDONE cleared on chn %d (%02X)."
+				" (%s)\n", chn, ret, where);
+			probe = ipath_sd7220_reg_mod(dd, IB_7220_SERDES,
+				IB_PGUDP(0), 0, 0);
+			ipath_dev_err(dd, "probe is %d (%02X)\n",
+				probe, probe);
+			probe = ipath_sd7220_reg_mod(dd, IB_7220_SERDES,
+				IB_CTRL2(chn), 0, 0);
+			ipath_dev_err(dd, "re-read: %d (%02X)\n",
+				probe, probe);
+			ret = ipath_sd7220_reg_mod(dd, IB_7220_SERDES,
+				IB_CTRL2(chn), 0x10, 0x10);
+			if (ret < 0)
+				ipath_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)) {
+			ipath_dev_err(dd,
+				"Reseting TRIMDONE on chn %d (%s)\n",
+				chn, where);
+			ret = ipath_sd7220_reg_mod(dd, IB_7220_SERDES,
+				IB_CTRL2(chn), 0x10, 0x10);
+			if (ret < 0)
+				ipath_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 ipath_sd7220_init(struct ipath_devdata *dd, int was_reset)
+{
+	int ret = 1; /* default to failure */
+	int first_reset;
+	int val_stat;
+
+	if (!was_reset) {
+		/* entered with reset not asserted, we need to do it */
+		ipath_ibsd_reset(dd, 1);
+		ipath_sd_trimdone_monitor(dd, "Driver-reload");
+	}
+
+	/* Substitute our deduced value for was_reset */
+	ret = ipath_ibsd_ucode_loaded(dd);
+	if (ret < 0) {
+		ret = 1;
+		goto done;
+	}
+	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 = ipath_sd_early(dd);
+	if (ret < 0) {
+		ipath_dev_err(dd, "Failed to set IB SERDES early defaults\n");
+		ret = 1;
+		goto done;
+	}
+
+	/*
+	 * 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 = ipath_sd_dactrim(dd);
+		if (ret < 0) {
+			ipath_dev_err(dd, "Failed IB SERDES DAC trim\n");
+			ret = 1;
+			goto done;
+		}
+	}
+
+	/*
+	 * 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 = ipath_internal_presets(dd);
+	if (ret < 0) {
+		ipath_dev_err(dd, "Failed to set IB SERDES presets\n");
+		ret = 1;
+		goto done;
+	}
+	ret = ipath_sd_trimself(dd, 0x80);
+	if (ret < 0) {
+		ipath_dev_err(dd, "Failed to set IB SERDES TRIMSELF\n");
+		ret = 1;
+		goto done;
+	}
+
+	/* Load image, then try to verify */
+	ret = 0;	/* Assume success */
+	if (first_reset) {
+		int vfy;
+		int trim_done;
+		ipath_dbg("SerDes uC was reset, reloading PRAM\n");
+		ret = ipath_sd7220_ib_load(dd);
+		if (ret < 0) {
+			ipath_dev_err(dd, "Failed to load IB SERDES image\n");
+			ret = 1;
+			goto done;
+		}
+
+		/* Loaded image, try to verify */
+		vfy = ipath_sd7220_ib_vfy(dd);
+		if (vfy != ret) {
+			ipath_dev_err(dd, "SERDES PRAM VFY failed\n");
+			ret = 1;
+			goto done;
+		}
+		/*
+		 * 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) {
+			ipath_dev_err(dd, "Failed clearing START_EQ1\n");
+			ret = 1;
+			goto done;
+		}
+
+		ipath_ibsd_reset(dd, 0);
+		/*
+		 * If this is not the first reset, trimdone should be set
+		 * already.
+		 */
+		trim_done = ipath_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.
+		 */
+		ipath_ibsd_reset(dd, 1);
+
+		if (!trim_done) {
+			ipath_dev_err(dd, "No TRIMDONE seen\n");
+			ret = 1;
+			goto done;
+		}
+
+		ipath_sd_trimdone_monitor(dd, "First-reset");
+		/* Remember so we do not re-do the load, dactrim, etc. */
+		dd->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
+	 */
+
+	val_stat = ipath_sd_setvals(dd);
+	if (val_stat < 0)
+		ret = 1;
+done:
+	/* start relock timer regardless, but start at 1 second */
+	ipath_set_relock_poll(dd, -1);
+	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 ipath_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 = dd->ipath_kregs->kr_ib_epbacc;
+		break;
+	case PCIE_SERDES0 :
+	case PCIE_SERDES1 :
+		/* PCIe SERDES has two "octants", need to select which */
+		acc = dd->ipath_kregs->kr_pcie_epbacc;
+		oct_sel = (2 << (sdnum - PCIE_SERDES0));
+		break;
+	default :
+		return 0;
+	}
+
+	/* Make sure any outstanding transaction was seen */
+	ipath_read_kreg32(dd, dd->ipath_kregs->kr_scratch);
+	udelay(15);
+
+	accval = ipath_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;
+		ipath_write_kreg(dd, acc, newval);
+		/* First read after write is not trustworthy */
+		pollval = ipath_read_kreg32(dd, acc);
+		udelay(5);
+		pollval = ipath_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;
+		ipath_write_kreg(dd, acc, newval);
+		/* First read after write is not trustworthy */
+		pollval = ipath_read_kreg32(dd, acc);
+		udelay(5);
+		pollval = ipath_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 ipath_devdata *dd, u16 reg, u64 i_val, u64 *o_vp)
+{
+	int tries;
+	u64 transval;
+
+
+	ipath_write_kreg(dd, reg, i_val);
+	/* Throw away first read, as RDY bit may be stale */
+	transval = ipath_read_kreg64(dd, reg);
+
+	for (tries = EPB_TRANS_TRIES; tries; --tries) {
+		transval = ipath_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;
+}
+
+/**
+ *
+ * ipath_sd7220_reg_mod - modify SERDES register
+ * @dd: the infinipath 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 ipath_sd7220_reg_mod(struct ipath_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 = dd->ipath_kregs->kr_ib_epbtrans;
+		break;
+	case PCIE_SERDES0 :
+	case PCIE_SERDES1 :
+		trans = dd->ipath_kregs->kr_pcie_epbtrans;
+		break;
+	default :
+		return -1;
+	}
+
+	/*
+	 * All access is locked in software (vs other host threads) and
+	 * hardware (vs uC access).
+	 */
+	spin_lock_irqsave(&dd->ipath_sdepb_lock, flags);
+
+	owned = epb_access(dd, sdnum, 1);
+	if (owned < 0) {
+		spin_unlock_irqrestore(&dd->ipath_sdepb_lock, flags);
+		return -1;
+	}
+	ret = 0;
+	for (tries = EPB_TRANS_TRIES; tries; --tries) {
+		transval = ipath_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->ipath_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 ipath_sd7220_ram_xfer(struct ipath_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;
+	const char *op;
+
+	/* Pick appropriate transaction reg and "Chip select" for this serdes */
+	switch (sdnum) {
+	case IB_7220_SERDES :
+		csbit = 1ULL << EPB_IB_UC_CS_SHF;
+		trans = dd->ipath_kregs->kr_ib_epbtrans;
+		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 = dd->ipath_kregs->kr_pcie_epbtrans;
+		break;
+	default :
+		return -1;
+	}
+
+	op = rd_notwr ? "Rd" : "Wr";
+	spin_lock_irqsave(&dd->ipath_sdepb_lock, flags);
+
+	owned = epb_access(dd, sdnum, 1);
+	if (owned < 0) {
+		spin_unlock_irqrestore(&dd->ipath_sdepb_lock, flags);
+		ipath_dbg("Could not get %s access to %s EPB: %X, loc %X\n",
+			op, (sdnum == IB_7220_SERDES) ? "IB" : "PCIe",
+			owned, loc);
+		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 = ipath_read_kreg32(dd, trans);
+		if (transval & EPB_TRANS_RDY)
+			break;
+		udelay(5);
+	}
+
+	sofar = 0;
+	if (tries <= 0)
+		ipath_dbg("No initial RDY on EPB access request\n");
+	else {
+		/*
+		 * 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);
+		if (tries <= 0)
+			ipath_dbg("No EPB response to uC %s cmd\n", op);
+		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) {
+					ipath_dbg("No EPB response ADDRH\n");
+					break;
+				}
+				addrbyte = (addr + sofar) & 0xFF;
+				transval = csbit | EPB_MADDRL | addrbyte;
+				tries = epb_trans(dd, trans, transval,
+						 &transval);
+				if (tries <= 0) {
+					ipath_dbg("No EPB response ADDRL\n");
+					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) {
+				ipath_dbg("No EPB response DATA\n");
+				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);
+		if (tries <= 0)
+			ipath_dbg("No EPB response to drop of uC %s cmd\n", op);
+	}
+
+	ret = sofar;
+	/* Release bus. Failure is an error */
+	if (epb_access(dd, sdnum, -1) < 0)
+		ret = -1;
+
+	spin_unlock_irqrestore(&dd->ipath_sdepb_lock, flags);
+	if (tries <= 0) {
+		ipath_dbg("SERDES PRAM %s failed after %d bytes\n", op, sofar);
+		ret = -1;
+	}
+	return ret;
+}
+
+#define PROG_CHUNK 64
+
+int ipath_sd7220_prog_ld(struct ipath_devdata *dd, int sdnum,
+	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 = ipath_sd7220_ram_xfer(dd, sdnum, offset + sofar,
+					  img + sofar, req, 0);
+		if (cnt < req) {
+			sofar = -1;
+			break;
+		}
+		sofar += req;
+	}
+	return sofar;
+}
+
+#define VFY_CHUNK 64
+#define SD_PRAM_ERROR_LIMIT 42
+
+int ipath_sd7220_prog_vfy(struct ipath_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 = ipath_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;
+}
+
+/* IRQ not set up at this point in init, so we poll. */
+#define IB_SERDES_TRIM_DONE (1ULL << 11)
+#define TRIM_TMO (30)
+
+static int ipath_sd_trimdone_poll(struct ipath_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 = ipath_read_kreg64(dd, dd->ipath_kregs->kr_ibcstatus);
+		if (val & IB_SERDES_TRIM_DONE) {
+			ipath_cdbg(VERBOSE, "TRIMDONE after %d\n", trim_tmo);
+			ret = 1;
+			break;
+		}
+		msleep(10);
+	}
+	if (trim_tmo >= TRIM_TMO) {
+		ipath_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)
+};
+
+/*
+ * Next, values related to Receive Equalization.
+ * In comments, FDR (Full) is IB DDR, HDR (Half) is IB SDR
+ */
+/* 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 */
+	RXEQ_VAL(7, 0x21, 0, 0, 0, 0), /* HDR */
+	/* Set TLTHFDR/HDR theshold */
+	RXEQ_VAL(7, 9,    2, 2, 2, 2), /* FDR */
+	RXEQ_VAL(7, 0x23, 2, 2, 2, 2), /* HDR */
+	/* Set Preamp setting 2 (ZFR/ZCNT) */
+	RXEQ_VAL(7, 0x1B, 12, 12, 12, 12), /* FDR */
+	RXEQ_VAL(7, 0x1C, 12, 12, 12, 12), /* HDR */
+	/* Set Preamp DC gain and Setting 1 (GFR/GHR) */
+	RXEQ_VAL(7, 0x1E, 0x10, 0x10, 0x10, 0x10), /* FDR */
+	RXEQ_VAL(7, 0x1F, 0x10, 0x10, 0x10, 0x10), /* HDR */
+	/* 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 ipath_sd_setvals(struct ipath_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->ipath_kregbase + KR_IBSerDesMappTable;
+	iaddr = dd->ipath_kregbase + dd->ipath_kregs->kr_ib_ddsrxeq;
+
+	/*
+	 * 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 = ipath_read_kreg64(dd, dd->ipath_kregs->kr_ibserdesctrl);
+	sdctl = (sdctl & ~(0x1f << 8)) | (NUM_DDS_REGS << 8);
+	sdctl = (sdctl & ~(0x1f << 13)) | (RXEQ_ROWS << 13);
+	ipath_write_kreg(dd, dd->ipath_kregs->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);
+		mmiowb();
+		ipath_read_kreg32(dd, dd->ipath_kregs->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);
+			mmiowb();
+			ipath_read_kreg32(dd, dd->ipath_kregs->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. As explained above the table
+	 * rxeq_init_vals[], 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);
+		mmiowb();
+		ipath_read_kreg32(dd, dd->ipath_kregs->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);
+			mmiowb();
+			ipath_read_kreg32(dd, dd->ipath_kregs->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)
+
+static int ibsd_sto_noisy(struct ipath_devdata *dd, int loc, int val, int mask)
+{
+	int ret = -1;
+	int sloc; /* shifted loc, for messages */
+
+	loc |= (1U << EPB_IB_QUAD0_CS_SHF);
+	sloc = loc >> EPB_ADDR_SHF;
+
+	ret = ipath_sd7220_reg_mod(dd, IB_7220_SERDES, loc, val, mask);
+	if (ret < 0)
+		ipath_dev_err(dd, "Write failed: elt %d,"
+			" addr 0x%X, chnl %d, val 0x%02X, mask 0x%02X\n",
+			(sloc & 0xF), (sloc >> 9) & 0x3f, (sloc >> 4) & 7,
+			val & 0xFF, mask & 0xFF);
+	return ret;
+}
+
+/*
+ * 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 for the channel-0 copy of the register to
+ * be modified.
+ */
+static int ibsd_mod_allchnls(struct ipath_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 = ipath_sd7220_reg_mod(dd, IB_7220_SERDES,
+				loc & ~EPB_GLOBAL_WR, 0, 0);
+			if (ret < 0) {
+				int sloc = loc >> EPB_ADDR_SHF;
+				ipath_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 = ipath_sd7220_reg_mod(dd, IB_7220_SERDES, loc, val, 0xFF);
+		if (ret < 0) {
+			int sloc = loc >> EPB_ADDR_SHF;
+			ipath_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;
+		cloc = loc | (chnl << (4+EPB_ADDR_SHF));
+		ret = ipath_sd7220_reg_mod(dd, IB_7220_SERDES, cloc, val, mask);
+		if (ret < 0) {
+			int sloc = loc >> EPB_ADDR_SHF;
+			ipath_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 ipath_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 ipath_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 ipath_rxeq_set = 2;
+module_param_named(rxeq_default_set, ipath_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 ipath_internal_presets(struct ipath_devdata *dd)
+{
+	int ret = 0;
+
+	ret = set_dds_vals(dd, dds_init_vals + DDS_3M);
+
+	if (ret < 0)
+		ipath_dev_err(dd, "Failed to set default DDS values\n");
+	ret = set_rxeq_vals(dd, ipath_rxeq_set & 3);
+	if (ret < 0)
+		ipath_dev_err(dd, "Failed to set default RXEQ values\n");
+	return ret;
+}
+
+int ipath_sd7220_presets(struct ipath_devdata *dd)
+{
+	int ret = 0;
+
+	if (!dd->ipath_presets_needed)
+		return ret;
+	dd->ipath_presets_needed = 0;
+	/* Assert uC reset, so we don't clash with it. */
+	ipath_ibsd_reset(dd, 1);
+	udelay(2);
+	ipath_sd_trimdone_monitor(dd, "link-down");
+
+	ret = ipath_internal_presets(dd);
+return ret;
+}
+
+static int ipath_sd_trimself(struct ipath_devdata *dd, int val)
+{
+	return ibsd_sto_noisy(dd, CMUCTRL5, val, 0xFF);
+}
+
+static int ipath_sd_early(struct ipath_devdata *dd)
+{
+	int ret = -1; /* Default failed */
+	int chnl;
+
+	for (chnl = 0; chnl < 4; ++chnl) {
+		ret = ibsd_sto_noisy(dd, RXHSCTRL0(chnl), 0xD4, 0xFF);
+		if (ret < 0)
+			goto bail;
+	}
+	for (chnl = 0; chnl < 4; ++chnl) {
+		ret = ibsd_sto_noisy(dd, VCDL_DAC2(chnl), 0x2D, 0xFF);
+		if (ret < 0)
+			goto bail;
+	}
+	/* more fine-tuning of what will be default */
+	for (chnl = 0; chnl < 4; ++chnl) {
+		ret = ibsd_sto_noisy(dd, VCDL_CTRL2(chnl), 3, 0xF);
+		if (ret < 0)
+			goto bail;
+	}
+	for (chnl = 0; chnl < 4; ++chnl) {
+		ret = ibsd_sto_noisy(dd, START_EQ1(chnl), 0x10, 0xFF);
+		if (ret < 0)
+			goto bail;
+	}
+	for (chnl = 0; chnl < 4; ++chnl) {
+		ret = ibsd_sto_noisy(dd, START_EQ2(chnl), 0x30, 0xFF);
+		if (ret < 0)
+			goto bail;
+	}
+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 ipath_sd_dactrim(struct ipath_devdata *dd)
+{
+	int ret = -1; /* Default failed */
+	int chnl;
+
+	for (chnl = 0; chnl < 4; ++chnl) {
+		ret = ibsd_sto_noisy(dd, BACTRL(chnl), 0x40, 0xFF);
+		if (ret < 0)
+			goto bail;
+	}
+	for (chnl = 0; chnl < 4; ++chnl) {
+		ret = ibsd_sto_noisy(dd, LDOUTCTRL1(chnl), 0x04, 0xFF);
+		if (ret < 0)
+			goto bail;
+	}
+	for (chnl = 0; chnl < 4; ++chnl) {
+		ret = ibsd_sto_noisy(dd, RXHSSTATUS(chnl), 0x04, 0xFF);
+		if (ret < 0)
+			goto bail;
+	}
+	/*
+	 * delay for max possible number of steps, with slop.
+	 * Each step is about 4usec.
+	 */
+	udelay(415);
+	for (chnl = 0; chnl < 4; ++chnl) {
+		ret = ibsd_sto_noisy(dd, LDOUTCTRL1(chnl), 0x00, 0xFF);
+		if (ret < 0)
+			goto bail;
+	}
+bail:
+	return ret;
+}
+
+#define RELOCK_FIRST_MS 3
+#define RXLSPPM(chan) EPB_LOC(chan, 0, 2)
+void ipath_toggle_rclkrls(struct ipath_devdata *dd)
+{
+	int loc = RXLSPPM(0) | EPB_GLOBAL_WR;
+	int ret;
+
+	ret = ibsd_mod_allchnls(dd, loc, 0, 0x80);
+	if (ret < 0)
+		ipath_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)
+		ipath_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->ipath_f_xgxs_reset(dd);
+}
+
+/*
+ * Shut down the timer that polls for relock occasions, if needed
+ * this is "hooked" from ipath_7220_quiet_serdes(), which is called
+ * just before ipath_shutdown_device() in ipath_driver.c shuts down all
+ * the other timers
+ */
+void ipath_shutdown_relock_poll(struct ipath_devdata *dd)
+{
+	struct ipath_relock *irp = &dd->ipath_relock_singleton;
+	if (atomic_read(&irp->ipath_relock_timer_active)) {
+		del_timer_sync(&irp->ipath_relock_timer);
+		atomic_set(&irp->ipath_relock_timer_active, 0);
+	}
+}
+
+static unsigned ipath_relock_by_timer = 1;
+module_param_named(relock_by_timer, ipath_relock_by_timer, uint,
+	S_IWUSR | S_IRUGO);
+MODULE_PARM_DESC(relock_by_timer, "Allow relock attempt if link not up");
+
+static void ipath_run_relock(unsigned long opaque)
+{
+	struct ipath_devdata *dd = (struct ipath_devdata *)opaque;
+	struct ipath_relock *irp = &dd->ipath_relock_singleton;
+	u64 val, ltstate;
+
+	if (!(dd->ipath_flags & IPATH_INITTED)) {
+		/* Not yet up, just reenable the timer for later */
+		irp->ipath_relock_interval = HZ;
+		mod_timer(&irp->ipath_relock_timer, jiffies + HZ);
+		return;
+	}
+
+	/*
+	 * Check link-training state for "stuck" state.
+	 * if found, try relock and schedule another try at
+	 * exponentially growing delay, maxed at one second.
+	 * if not stuck, our work is done.
+	 */
+	val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_ibcstatus);
+	ltstate = ipath_ib_linktrstate(dd, val);
+
+	if (ltstate <= INFINIPATH_IBCS_LT_STATE_CFGWAITRMT
+		&& ltstate != INFINIPATH_IBCS_LT_STATE_LINKUP) {
+		int timeoff;
+		/* Not up yet. Try again, if allowed by module-param */
+		if (ipath_relock_by_timer) {
+			if (dd->ipath_flags & IPATH_IB_AUTONEG_INPROG)
+				ipath_cdbg(VERBOSE, "Skip RELOCK in AUTONEG\n");
+			else if (!(dd->ipath_flags & IPATH_IB_LINK_DISABLED)) {
+				ipath_cdbg(VERBOSE, "RELOCK\n");
+				ipath_toggle_rclkrls(dd);
+			}
+		}
+		/* re-set timer for next check */
+		timeoff = irp->ipath_relock_interval << 1;
+		if (timeoff > HZ)
+			timeoff = HZ;
+		irp->ipath_relock_interval = timeoff;
+
+		mod_timer(&irp->ipath_relock_timer, jiffies + timeoff);
+	} else {
+		/* Up, so no more need to check so often */
+		mod_timer(&irp->ipath_relock_timer, jiffies + HZ);
+	}
+}
+
+void ipath_set_relock_poll(struct ipath_devdata *dd, int ibup)
+{
+	struct ipath_relock *irp = &dd->ipath_relock_singleton;
+
+	if (ibup > 0) {
+		/* we are now up, so relax timer to 1 second interval */
+		if (atomic_read(&irp->ipath_relock_timer_active))
+			mod_timer(&irp->ipath_relock_timer, jiffies + HZ);
+	} else {
+		/* Transition to down, (re-)set timer to short interval. */
+		int timeout;
+		timeout = (HZ * ((ibup == -1) ? 1000 : RELOCK_FIRST_MS))/1000;
+		if (timeout == 0)
+			timeout = 1;
+		/* If timer has not yet been started, do so. */
+		if (atomic_inc_return(&irp->ipath_relock_timer_active) == 1) {
+			init_timer(&irp->ipath_relock_timer);
+			irp->ipath_relock_timer.function = ipath_run_relock;
+			irp->ipath_relock_timer.data = (unsigned long) dd;
+			irp->ipath_relock_interval = timeout;
+			irp->ipath_relock_timer.expires = jiffies + timeout;
+			add_timer(&irp->ipath_relock_timer);
+		} else {
+			irp->ipath_relock_interval = timeout;
+			mod_timer(&irp->ipath_relock_timer, jiffies + timeout);
+			atomic_dec(&irp->ipath_relock_timer_active);
+		}
+	}
+}
+