/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License, Version 1.0 only * (the "License"). You may not use this file except in compliance * with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2005 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #pragma ident "%Z%%M% %I% %E% SMI" #include "sys/bge_impl.h" /* * Bit test macros, returning boolean_t values */ #define BIS(w, b) (((w) & (b)) ? B_TRUE : B_FALSE) #define BIC(w, b) (((w) & (b)) ? B_FALSE : B_TRUE) #define UPORDOWN(x) ((x) ? "up" : "down") /* * ========== Copper (PHY) support ========== */ #define BGE_DBG BGE_DBG_PHY /* debug flag for this code */ /* * #defines: * BGE_COPPER_WIRESPEED controls whether the Broadcom WireSpeed(tm) * feature is enabled. We need to recheck whether this can be * enabled; at one time it seemed to interact unpleasantly with the * loopback modes. * * BGE_COPPER_IDLEOFF controls whether the (copper) PHY power is * turned off when the PHY is idled i.e. during driver suspend(). * For now this is disabled because the chip doesn't seem to * resume cleanly if the PHY power is turned off. */ #define BGE_COPPER_WIRESPEED B_TRUE #define BGE_COPPER_IDLEOFF B_FALSE /* * The arrays below can be indexed by the MODE bits from the Auxiliary * Status register to determine the current speed/duplex settings. */ static const int16_t bge_copper_link_speed[] = { 0, /* MII_AUX_STATUS_MODE_NONE */ 10, /* MII_AUX_STATUS_MODE_10_H */ 10, /* MII_AUX_STATUS_MODE_10_F */ 100, /* MII_AUX_STATUS_MODE_100_H */ 0, /* MII_AUX_STATUS_MODE_100_4 */ 100, /* MII_AUX_STATUS_MODE_100_F */ 1000, /* MII_AUX_STATUS_MODE_1000_H */ 1000 /* MII_AUX_STATUS_MODE_1000_F */ }; static const int8_t bge_copper_link_duplex[] = { LINK_DUPLEX_UNKNOWN, /* MII_AUX_STATUS_MODE_NONE */ LINK_DUPLEX_HALF, /* MII_AUX_STATUS_MODE_10_H */ LINK_DUPLEX_FULL, /* MII_AUX_STATUS_MODE_10_F */ LINK_DUPLEX_HALF, /* MII_AUX_STATUS_MODE_100_H */ LINK_DUPLEX_UNKNOWN, /* MII_AUX_STATUS_MODE_100_4 */ LINK_DUPLEX_FULL, /* MII_AUX_STATUS_MODE_100_F */ LINK_DUPLEX_HALF, /* MII_AUX_STATUS_MODE_1000_H */ LINK_DUPLEX_FULL /* MII_AUX_STATUS_MODE_1000_F */ }; static const char * const bge_copper_link_text[] = { "down", /* MII_AUX_STATUS_MODE_NONE */ "up 10Mbps Half-Duplex", /* MII_AUX_STATUS_MODE_10_H */ "up 10Mbps Full-Duplex", /* MII_AUX_STATUS_MODE_10_F */ "up 100Mbps Half-Duplex", /* MII_AUX_STATUS_MODE_100_H */ "down", /* MII_AUX_STATUS_MODE_100_4 */ "up 100Mbps Full-Duplex", /* MII_AUX_STATUS_MODE_100_F */ "up 1000Mbps Half-Duplex", /* MII_AUX_STATUS_MODE_1000_H */ "up 1000Mbps Full-Duplex" /* MII_AUX_STATUS_MODE_1000_F */ }; #if BGE_DEBUGGING static void bge_phydump(bge_t *bgep, uint16_t mii_status, uint16_t aux) { uint16_t regs[32]; int i; ASSERT(mutex_owned(bgep->genlock)); for (i = 0; i < 32; ++i) switch (i) { default: regs[i] = bge_mii_get16(bgep, i); break; case MII_STATUS: regs[i] = mii_status; break; case MII_AUX_STATUS: regs[i] = aux; break; case 0x0b: case 0x0c: case 0x0d: case 0x0e: case 0x15: case 0x16: case 0x17: case 0x1c: case 0x1f: /* reserved registers -- don't read these */ regs[i] = 0; break; } for (i = 0; i < 32; i += 8) BGE_DEBUG(("bge_phydump: " "0x%04x %04x %04x %04x %04x %04x %04x %04x", regs[i+0], regs[i+1], regs[i+2], regs[i+3], regs[i+4], regs[i+5], regs[i+6], regs[i+7])); } #endif /* BGE_DEBUGGING */ /* * Basic low-level function to probe for a PHY * * Returns TRUE if the PHY responds with valid data, FALSE otherwise */ static boolean_t bge_phy_probe(bge_t *bgep) { uint16_t phy_status; BGE_TRACE(("bge_phy_probe($%p)", (void *)bgep)); ASSERT(mutex_owned(bgep->genlock)); /* * Read the MII_STATUS register twice, in * order to clear any sticky bits (but they should * have been cleared by the RESET, I think). */ phy_status = bge_mii_get16(bgep, MII_STATUS); phy_status = bge_mii_get16(bgep, MII_STATUS); BGE_DEBUG(("bge_phy_probe: status 0x%x", phy_status)); /* * Now check the value read; it should have at least one bit set * (for the device capabilities) and at least one clear (one of * the error bits). So if we see all 0s or all 1s, there's a * problem. In particular, bge_mii_get16() returns all 1s if * communications fails ... */ switch (phy_status) { case 0x0000: case 0xffff: return (B_FALSE); default : return (B_TRUE); } } /* * Basic low-level function to reset the PHY. * Doesn't incorporate any special-case workarounds. * * Returns TRUE on success, FALSE if the RESET bit doesn't clear */ static boolean_t bge_phy_reset(bge_t *bgep) { uint16_t control; uint_t count; BGE_TRACE(("bge_phy_reset($%p)", (void *)bgep)); ASSERT(mutex_owned(bgep->genlock)); /* * Set the PHY RESET bit, then wait up to 5 ms for it to self-clear */ bge_mii_put16(bgep, MII_CONTROL, MII_CONTROL_RESET); for (count = 0; ++count < 1000; ) { drv_usecwait(5); control = bge_mii_get16(bgep, MII_CONTROL); if (BIC(control, MII_CONTROL_RESET)) return (B_TRUE); } BGE_DEBUG(("bge_phy_reset: FAILED, control now 0x%x", control)); return (B_FALSE); } /* * Basic low-level function to powerdown the PHY, if supported * If powerdown support is compiled out, this function does nothing. */ static void bge_phy_powerdown(bge_t *bgep) { BGE_TRACE(("bge_phy_powerdown")); #if BGE_COPPER_IDLEOFF bge_mii_put16(bgep, MII_CONTROL, MII_CONTROL_PWRDN); #endif /* BGE_COPPER_IDLEOFF */ } /* * The following functions are based on sample code provided by * Broadcom (20-June-2003), and implement workarounds said to be * required on the early revisions of the BCM5703/4C. * * The registers and values used are mostly UNDOCUMENTED, and * therefore don't have symbolic names ;-( * * Many of the comments are straight out of the Broadcom code: * even where the code has been restructured, the original * comments have been preserved in order to explain what these * undocumented registers & values are all about ... */ static void bge_phy_macro_wait(bge_t *bgep) { uint_t count; for (count = 100; --count; ) if ((bge_mii_get16(bgep, 0x16) & 0x1000) == 0) break; } /* * PHY test data pattern: * * For 5703/04, each DFE TAP has 21-bits (low word 15, hi word 6) * For 5705, each DFE TAP has 19-bits (low word 15, hi word 4) * For simplicity, we check only 19-bits, so we don't have to * distinguish which chip it is. * the LO word contains 15 bits, make sure pattern data is < 0x7fff * the HI word contains 6 bits, make sure pattern data is < 0x003f */ #define N_CHANNELS 4 #define N_TAPS 3 static struct { uint16_t lo; uint16_t hi; } tap_data[N_CHANNELS][N_TAPS] = { { { 0x5555, 0x0005 }, /* ch0, TAP 0, LO/HI pattern */ { 0x2aaa, 0x000a }, /* ch0, TAP 1, LO/HI pattern */ { 0x3456, 0x0003 } /* ch0, TAP 2, LO/HI pattern */ }, { { 0x2aaa, 0x000a }, /* ch1, TAP 0, LO/HI pattern */ { 0x3333, 0x0003 }, /* ch1, TAP 1, LO/HI pattern */ { 0x789a, 0x0005 } /* ch1, TAP 2, LO/HI pattern */ }, { { 0x5a5a, 0x0005 }, /* ch2, TAP 0, LO/HI pattern */ { 0x2a6a, 0x000a }, /* ch2, TAP 1, LO/HI pattern */ { 0x1bcd, 0x0003 } /* ch2, TAP 2, LO/HI pattern */ }, { { 0x2a5a, 0x000a }, /* ch3, TAP 0, LO/HI pattern */ { 0x33c3, 0x0003 }, /* ch3, TAP 1, LO/HI pattern */ { 0x2ef1, 0x0005 } /* ch3, TAP 2, LO/HI pattern */ } }; /* * Check whether the PHY has locked up after a RESET. * * Returns TRUE if it did, FALSE is it's OK ;-) */ static boolean_t bge_phy_locked_up(bge_t *bgep) { uint16_t dataLo; uint16_t dataHi; uint_t chan; uint_t tap; /* * Check TAPs for all 4 channels, as soon as we see a lockup * we'll stop checking. */ for (chan = 0; chan < N_CHANNELS; ++chan) { /* Select channel and set TAP index to 0 */ bge_mii_put16(bgep, 0x17, (chan << 13) | 0x0200); /* Freeze filter again just to be safe */ bge_mii_put16(bgep, 0x16, 0x0002); /* * Write fixed pattern to the RAM, 3 TAPs for * each channel, each TAP have 2 WORDs (LO/HI) */ for (tap = 0; tap < N_TAPS; ++tap) { bge_mii_put16(bgep, 0x15, tap_data[chan][tap].lo); bge_mii_put16(bgep, 0x15, tap_data[chan][tap].hi); } /* * Active PHY's Macro operation to write DFE * TAP from RAM, and wait for Macro to complete. */ bge_mii_put16(bgep, 0x16, 0x0202); bge_phy_macro_wait(bgep); /* * Done with write phase, now begin read phase. */ /* Select channel and set TAP index to 0 */ bge_mii_put16(bgep, 0x17, (chan << 13) | 0x0200); /* * Active PHY's Macro operation to load DFE * TAP to RAM, and wait for Macro to complete */ bge_mii_put16(bgep, 0x16, 0x0082); bge_phy_macro_wait(bgep); /* Enable "pre-fetch" */ bge_mii_put16(bgep, 0x16, 0x0802); bge_phy_macro_wait(bgep); /* * Read back the TAP values. 3 TAPs for each * channel, each TAP have 2 WORDs (LO/HI) */ for (tap = 0; tap < N_TAPS; ++tap) { /* * Read Lo/Hi then wait for 'done' is faster. * For DFE TAP, the HI word contains 6 bits, * LO word contains 15 bits */ dataLo = bge_mii_get16(bgep, 0x15) & 0x7fff; dataHi = bge_mii_get16(bgep, 0x15) & 0x003f; bge_phy_macro_wait(bgep); /* * Check if what we wrote is what we read back. * If failed, then the PHY is locked up, we need * to do PHY reset again */ if (dataLo != tap_data[chan][tap].lo) return (B_TRUE); /* wedged! */ if (dataHi != tap_data[chan][tap].hi) return (B_TRUE); /* wedged! */ } } /* * The PHY isn't locked up ;-) */ return (B_FALSE); } /* * Special-case code to reset the PHY on the 5702/5703/5704C/5705/5782. * Tries up to 5 times to recover from failure to reset or PHY lockup. * * Returns TRUE on success, FALSE if there's an unrecoverable problem */ static boolean_t bge_phy_reset_and_check(bge_t *bgep) { boolean_t reset_success; boolean_t phy_locked; uint16_t extctrl; uint_t retries; for (retries = 0; retries < 5; ++retries) { /* Issue a phy reset, and wait for reset to complete */ /* Assuming reset is successful first */ reset_success = bge_phy_reset(bgep); /* * Now go check the DFE TAPs to see if locked up, but * first, we need to set up PHY so we can read DFE * TAPs. */ /* * Disable Transmitter and Interrupt, while we play * with the PHY registers, so the link partner won't * see any strange data and the Driver won't see any * interrupts. */ extctrl = bge_mii_get16(bgep, 0x10); bge_mii_put16(bgep, 0x10, extctrl | 0x3000); /* Setup Full-Duplex, 1000 mbps */ bge_mii_put16(bgep, 0x0, 0x0140); /* Set to Master mode */ bge_mii_put16(bgep, 0x9, 0x1800); /* Enable SM_DSP_CLOCK & 6dB */ bge_mii_put16(bgep, 0x18, 0x0c00); /* "the ADC fix" */ /* Work-arounds */ bge_mii_put16(bgep, 0x17, 0x201f); bge_mii_put16(bgep, 0x15, 0x2aaa); /* More workarounds */ bge_mii_put16(bgep, 0x17, 0x000a); bge_mii_put16(bgep, 0x15, 0x0323); /* "the Gamma fix" */ /* Blocks the PHY control access */ bge_mii_put16(bgep, 0x17, 0x8005); bge_mii_put16(bgep, 0x15, 0x0800); /* Test whether PHY locked up ;-( */ phy_locked = bge_phy_locked_up(bgep); if (reset_success && !phy_locked) break; /* * Some problem here ... log it & retry */ if (!reset_success) BGE_REPORT((bgep, "PHY didn't reset!")); if (phy_locked) BGE_REPORT((bgep, "PHY locked up!")); } /* Remove block phy control */ bge_mii_put16(bgep, 0x17, 0x8005); bge_mii_put16(bgep, 0x15, 0x0000); /* Unfreeze DFE TAP filter for all channels */ bge_mii_put16(bgep, 0x17, 0x8200); bge_mii_put16(bgep, 0x16, 0x0000); /* Restore PHY back to operating state */ bge_mii_put16(bgep, 0x18, 0x0400); /* Enable transmitter and interrupt */ extctrl = bge_mii_get16(bgep, 0x10); bge_mii_put16(bgep, 0x10, extctrl & ~0x3000); return (reset_success && !phy_locked); } static void bge_phy_tweak_gmii(bge_t *bgep) { /* Tweak GMII timing */ bge_mii_put16(bgep, 0x1c, 0x8d68); bge_mii_put16(bgep, 0x1c, 0x8d68); } /* * End of Broadcom-derived workaround code * */ static void bge_restart_copper(bge_t *bgep, boolean_t powerdown) { uint16_t phy_status; boolean_t reset_ok; BGE_TRACE(("bge_restart_copper($%p, %d)", (void *)bgep, powerdown)); ASSERT(mutex_owned(bgep->genlock)); switch (MHCR_CHIP_ASIC_REV(bgep->chipid.asic_rev)) { default: /* * Shouldn't happen; it means we don't recognise this chip. * It's probably a new one, so we'll try our best anyway ... */ case MHCR_CHIP_ASIC_REV_5703: case MHCR_CHIP_ASIC_REV_5704: case MHCR_CHIP_ASIC_REV_5705: case MHCR_CHIP_ASIC_REV_5721_5751: case MHCR_CHIP_ASIC_REV_5714: case MHCR_CHIP_ASIC_REV_5715: reset_ok = bge_phy_reset_and_check(bgep); break; case MHCR_CHIP_ASIC_REV_5700: case MHCR_CHIP_ASIC_REV_5701: /* * Just a plain reset; the "check" code breaks these chips */ reset_ok = bge_phy_reset(bgep); break; } if (!reset_ok) bge_problem(bgep, "PHY failed to reset correctly"); /* * Step 5: disable WOL (not required after RESET) * * Step 6: refer to errata */ switch (bgep->chipid.asic_rev) { default: break; case MHCR_CHIP_REV_5704_A0: bge_phy_tweak_gmii(bgep); break; } /* * Step 7: read the MII_INTR_STATUS register twice, * in order to clear any sticky bits (but they should * have been cleared by the RESET, I think), and we're * not using PHY interrupts anyway. * * Step 8: enable the PHY to interrupt on link status * change (not required) * * Step 9: configure PHY LED Mode - not applicable? * * Step 10: read the MII_STATUS register twice, in * order to clear any sticky bits (but they should * have been cleared by the RESET, I think). */ phy_status = bge_mii_get16(bgep, MII_STATUS); phy_status = bge_mii_get16(bgep, MII_STATUS); BGE_DEBUG(("bge_restart_copper: status 0x%x", phy_status)); /* * Finally, shut down the PHY, if required */ if (powerdown) bge_phy_powerdown(bgep); } /* * Synchronise the (copper) PHY's speed/duplex/autonegotiation capabilities * and advertisements with the required settings as specified by the various * param_* variables that can be poked via the NDD interface. * * We always reset the PHY and reprogram *all* the relevant registers, * not just those changed. This should cause the link to go down, and then * back up again once the link is stable and autonegotiation (if enabled) * is complete. We should get a link state change interrupt somewhere along * the way ... * * NOTE: must already be held by the caller */ static void bge_update_copper(bge_t *bgep) { boolean_t adv_autoneg; boolean_t adv_pause; boolean_t adv_asym_pause; boolean_t adv_1000fdx; boolean_t adv_1000hdx; boolean_t adv_100fdx; boolean_t adv_100hdx; boolean_t adv_10fdx; boolean_t adv_10hdx; uint16_t control; uint16_t gigctrl; uint16_t auxctrl; uint16_t anar; BGE_TRACE(("bge_update_copper($%p)", (void *)bgep)); ASSERT(mutex_owned(bgep->genlock)); BGE_DEBUG(("bge_update_copper: autoneg %d " "pause %d asym_pause %d " "1000fdx %d 1000hdx %d " "100fdx %d 100hdx %d " "10fdx %d 10hdx %d ", bgep->param_adv_autoneg, bgep->param_adv_pause, bgep->param_adv_asym_pause, bgep->param_adv_1000fdx, bgep->param_adv_1000hdx, bgep->param_adv_100fdx, bgep->param_adv_100hdx, bgep->param_adv_10fdx, bgep->param_adv_10hdx)); control = gigctrl = auxctrl = anar = 0; /* * PHY settings are normally based on the param_* variables, * but if any loopback mode is in effect, that takes precedence. * * BGE supports MAC-internal loopback, PHY-internal loopback, * and External loopback at a variety of speeds (with a special * cable). In all cases, autoneg is turned OFF, full-duplex * is turned ON, and the speed/mastership is forced. */ switch (bgep->param_loop_mode) { case BGE_LOOP_NONE: default: adv_autoneg = bgep->param_adv_autoneg; adv_pause = bgep->param_adv_pause; adv_asym_pause = bgep->param_adv_asym_pause; adv_1000fdx = bgep->param_adv_1000fdx; adv_1000hdx = bgep->param_adv_1000hdx; adv_100fdx = bgep->param_adv_100fdx; adv_100hdx = bgep->param_adv_100hdx; adv_10fdx = bgep->param_adv_10fdx; adv_10hdx = bgep->param_adv_10hdx; break; case BGE_LOOP_EXTERNAL_1000: case BGE_LOOP_EXTERNAL_100: case BGE_LOOP_EXTERNAL_10: case BGE_LOOP_INTERNAL_PHY: case BGE_LOOP_INTERNAL_MAC: adv_autoneg = adv_pause = adv_asym_pause = B_FALSE; adv_1000fdx = adv_100fdx = adv_10fdx = B_FALSE; adv_1000hdx = adv_100hdx = adv_10hdx = B_FALSE; bgep->param_link_duplex = LINK_DUPLEX_FULL; switch (bgep->param_loop_mode) { case BGE_LOOP_EXTERNAL_1000: bgep->param_link_speed = 1000; adv_1000fdx = B_TRUE; auxctrl = MII_AUX_CTRL_NORM_EXT_LOOPBACK; gigctrl |= MII_1000BT_CTL_MASTER_CFG; gigctrl |= MII_1000BT_CTL_MASTER_SEL; break; case BGE_LOOP_EXTERNAL_100: bgep->param_link_speed = 100; adv_100fdx = B_TRUE; auxctrl = MII_AUX_CTRL_NORM_EXT_LOOPBACK; break; case BGE_LOOP_EXTERNAL_10: bgep->param_link_speed = 10; adv_10fdx = B_TRUE; auxctrl = MII_AUX_CTRL_NORM_EXT_LOOPBACK; break; case BGE_LOOP_INTERNAL_PHY: bgep->param_link_speed = 1000; adv_1000fdx = B_TRUE; control = MII_CONTROL_LOOPBACK; break; case BGE_LOOP_INTERNAL_MAC: bgep->param_link_speed = 1000; adv_1000fdx = B_TRUE; break; } } BGE_DEBUG(("bge_update_copper: autoneg %d " "pause %d asym_pause %d " "1000fdx %d 1000hdx %d " "100fdx %d 100hdx %d " "10fdx %d 10hdx %d ", adv_autoneg, adv_pause, adv_asym_pause, adv_1000fdx, adv_1000hdx, adv_100fdx, adv_100hdx, adv_10fdx, adv_10hdx)); /* * We should have at least one technology capability set; * if not, we select a default of 1000Mb/s full-duplex */ if (!adv_1000fdx && !adv_100fdx && !adv_10fdx && !adv_1000hdx && !adv_100hdx && !adv_10hdx) adv_1000fdx = B_TRUE; /* * Now transform the adv_* variables into the proper settings * of the PHY registers ... * * If autonegotiation is (now) enabled, we want to trigger * a new autonegotiation cycle once the PHY has been * programmed with the capabilities to be advertised. */ if (adv_autoneg) control |= MII_CONTROL_ANE|MII_CONTROL_RSAN; if (adv_1000fdx) control |= MII_CONTROL_1000MB|MII_CONTROL_FDUPLEX; else if (adv_1000hdx) control |= MII_CONTROL_1000MB; else if (adv_100fdx) control |= MII_CONTROL_100MB|MII_CONTROL_FDUPLEX; else if (adv_100hdx) control |= MII_CONTROL_100MB; else if (adv_10fdx) control |= MII_CONTROL_FDUPLEX; else if (adv_10hdx) control |= 0; else { _NOTE(EMPTY); } /* Can't get here anyway ... */ if (adv_1000fdx) gigctrl |= MII_1000BT_CTL_ADV_FDX; if (adv_1000hdx) gigctrl |= MII_1000BT_CTL_ADV_HDX; if (adv_100fdx) anar |= MII_ABILITY_100BASE_TX_FD; if (adv_100hdx) anar |= MII_ABILITY_100BASE_TX; if (adv_10fdx) anar |= MII_ABILITY_10BASE_T_FD; if (adv_10hdx) anar |= MII_ABILITY_10BASE_T; if (adv_pause) anar |= MII_ABILITY_PAUSE; if (adv_asym_pause) anar |= MII_ABILITY_ASYM_PAUSE; /* * Munge in any other fixed bits we require ... */ anar |= MII_AN_SELECTOR_8023; auxctrl |= MII_AUX_CTRL_NORM_TX_MODE; auxctrl |= MII_AUX_CTRL_NORMAL; /* * Restart the PHY and write the new values. Note the * time, so that we can say whether subsequent link state * changes can be attributed to our reprogramming the PHY */ bgep->phys_write_time = gethrtime(); (*bgep->physops->phys_restart)(bgep, B_FALSE); bge_mii_put16(bgep, MII_AN_ADVERT, anar); bge_mii_put16(bgep, MII_CONTROL, control); bge_mii_put16(bgep, MII_AUX_CONTROL, auxctrl); bge_mii_put16(bgep, MII_1000BASE_T_CONTROL, gigctrl); BGE_DEBUG(("bge_update_copper: anar <- 0x%x", anar)); BGE_DEBUG(("bge_update_copper: control <- 0x%x", control)); BGE_DEBUG(("bge_update_copper: auxctrl <- 0x%x", auxctrl)); BGE_DEBUG(("bge_update_copper: gigctrl <- 0x%x", gigctrl)); #if BGE_COPPER_WIRESPEED /* * Enable the 'wire-speed' feature, if the chip supports it * and we haven't got (any) loopback mode selected. */ switch (bgep->chipid.device) { case DEVICE_ID_5700: case DEVICE_ID_5700x: case DEVICE_ID_5705C: case DEVICE_ID_5782: /* * These chips are known or assumed not to support it */ break; default: /* * All other Broadcom chips are expected to support it. */ if (bgep->param_loop_mode == BGE_LOOP_NONE) bge_mii_put16(bgep, MII_AUX_CONTROL, MII_AUX_CTRL_MISC_WRITE_ENABLE | MII_AUX_CTRL_MISC_WIRE_SPEED | MII_AUX_CTRL_MISC); break; } #endif /* BGE_COPPER_WIRESPEED */ } static boolean_t bge_check_copper(bge_t *bgep, boolean_t recheck) { uint32_t emac_status; uint16_t mii_status; uint16_t aux; uint_t mode; boolean_t linkup; /* * Step 10: read the status from the PHY (which is self-clearing * on read!); also read & clear the main (Ethernet) MAC status * (the relevant bits of this are write-one-to-clear). */ mii_status = bge_mii_get16(bgep, MII_STATUS); emac_status = bge_reg_get32(bgep, ETHERNET_MAC_STATUS_REG); bge_reg_put32(bgep, ETHERNET_MAC_STATUS_REG, emac_status); BGE_DEBUG(("bge_check_copper: link %d/%s, MII status 0x%x " "(was 0x%x), Ethernet MAC status 0x%x", bgep->link_state, UPORDOWN(bgep->param_link_up), mii_status, bgep->phy_gen_status, emac_status)); /* * If the PHY status hasn't changed since last we looked, and * we not forcing a recheck (i.e. the link state was already * known), there's nothing to do. */ if (mii_status == bgep->phy_gen_status && !recheck) return (B_FALSE); do { /* * If the PHY status changed, record the time */ if (mii_status != bgep->phy_gen_status) bgep->phys_event_time = gethrtime(); /* * Step 11: read AUX STATUS register to find speed/duplex */ aux = bge_mii_get16(bgep, MII_AUX_STATUS); BGE_CDB(bge_phydump, (bgep, mii_status, aux)); /* * We will only consider the link UP if all the readings * are consistent and give meaningful results ... */ mode = aux & MII_AUX_STATUS_MODE_MASK; mode >>= MII_AUX_STATUS_MODE_SHIFT; linkup = bge_copper_link_speed[mode] > 0; linkup &= bge_copper_link_duplex[mode] != LINK_DUPLEX_UNKNOWN; linkup &= BIS(aux, MII_AUX_STATUS_LINKUP); linkup &= BIS(mii_status, MII_STATUS_LINKUP); BGE_DEBUG(("bge_check_copper: MII status 0x%x aux 0x%x " "=> mode %d (%s)", mii_status, aux, mode, UPORDOWN(linkup))); /* * Record current register values, then reread status * register & loop until it stabilises ... */ bgep->phy_aux_status = aux; bgep->phy_gen_status = mii_status; mii_status = bge_mii_get16(bgep, MII_STATUS); } while (mii_status != bgep->phy_gen_status); /* * Assume very little ... */ bgep->param_lp_autoneg = B_FALSE; bgep->param_lp_1000fdx = B_FALSE; bgep->param_lp_1000hdx = B_FALSE; bgep->param_lp_100fdx = B_FALSE; bgep->param_lp_100hdx = B_FALSE; bgep->param_lp_10fdx = B_FALSE; bgep->param_lp_10hdx = B_FALSE; bgep->param_lp_pause = B_FALSE; bgep->param_lp_asym_pause = B_FALSE; bgep->param_link_autoneg = B_FALSE; bgep->param_link_tx_pause = B_FALSE; if (bgep->param_adv_autoneg) bgep->param_link_rx_pause = B_FALSE; else bgep->param_link_rx_pause = bgep->param_adv_pause; /* * Discover all the link partner's abilities. * These are scattered through various registters ... */ if (BIS(aux, MII_AUX_STATUS_LP_ANEG_ABLE)) { bgep->param_lp_autoneg = B_TRUE; bgep->param_link_autoneg = B_TRUE; bgep->param_link_tx_pause = BIS(aux, MII_AUX_STATUS_TX_PAUSE); bgep->param_link_rx_pause = BIS(aux, MII_AUX_STATUS_RX_PAUSE); aux = bge_mii_get16(bgep, MII_1000BASE_T_STATUS); bgep->param_lp_1000fdx = BIS(aux, MII_1000BT_STAT_LP_FDX_CAP); bgep->param_lp_1000hdx = BIS(aux, MII_1000BT_STAT_LP_HDX_CAP); aux = bge_mii_get16(bgep, MII_AN_LPABLE); bgep->param_lp_100fdx = BIS(aux, MII_ABILITY_100BASE_TX_FD); bgep->param_lp_100hdx = BIS(aux, MII_ABILITY_100BASE_TX); bgep->param_lp_10fdx = BIS(aux, MII_ABILITY_10BASE_T_FD); bgep->param_lp_10hdx = BIS(aux, MII_ABILITY_10BASE_T); bgep->param_lp_pause = BIS(aux, MII_ABILITY_PAUSE); bgep->param_lp_asym_pause = BIS(aux, MII_ABILITY_ASYM_PAUSE); } /* * Step 12: update ndd-visible state parameters, BUT! * we don't transfer the new state to just yet; * instead we mark the as UNKNOWN, and our caller * will resolve it once the status has stopped changing and * been stable for several seconds. */ BGE_DEBUG(("bge_check_copper: link was %s speed %d duplex %d", UPORDOWN(bgep->param_link_up), bgep->param_link_speed, bgep->param_link_duplex)); if (!linkup) mode = MII_AUX_STATUS_MODE_NONE; bgep->param_link_up = linkup; bgep->param_link_speed = bge_copper_link_speed[mode]; bgep->param_link_duplex = bge_copper_link_duplex[mode]; bgep->link_mode_msg = bge_copper_link_text[mode]; bgep->link_state = LINK_STATE_UNKNOWN; BGE_DEBUG(("bge_check_copper: link now %s speed %d duplex %d", UPORDOWN(bgep->param_link_up), bgep->param_link_speed, bgep->param_link_duplex)); return (B_TRUE); } static const phys_ops_t copper_ops = { bge_restart_copper, bge_update_copper, bge_check_copper }; /* * ========== SerDes support ========== */ #undef BGE_DBG #define BGE_DBG BGE_DBG_SERDES /* debug flag for this code */ /* * Reinitialise the SerDes interface. Note that it normally powers * up in the disabled state, so we need to explicitly activate it. */ static void bge_restart_serdes(bge_t *bgep, boolean_t powerdown) { uint32_t macmode; BGE_TRACE(("bge_restart_serdes($%p, %d)", (void *)bgep, powerdown)); ASSERT(mutex_owned(bgep->genlock)); /* * Ensure that the main Ethernet MAC mode register is programmed * appropriately for the SerDes interface ... */ macmode = bge_reg_get32(bgep, ETHERNET_MAC_MODE_REG); macmode &= ~ETHERNET_MODE_LINK_POLARITY; macmode &= ~ETHERNET_MODE_PORTMODE_MASK; macmode |= ETHERNET_MODE_PORTMODE_TBI; bge_reg_put32(bgep, ETHERNET_MAC_MODE_REG, macmode); /* * Ensure that loopback is OFF and comma detection is enabled. Then * disable the SerDes output (the first time through, it may/will * already be disabled). If we're shutting down, leave it disabled. */ bge_reg_clr32(bgep, SERDES_CONTROL_REG, SERDES_CONTROL_TBI_LOOPBACK); bge_reg_set32(bgep, SERDES_CONTROL_REG, SERDES_CONTROL_COMMA_DETECT); bge_reg_set32(bgep, SERDES_CONTROL_REG, SERDES_CONTROL_TX_DISABLE); if (powerdown) return; /* * Otherwise, pause, (re-)enable the SerDes output, and send * all-zero config words in order to force autoneg restart. * Invalidate the saved "link partners received configs", as * we're starting over ... */ drv_usecwait(10000); bge_reg_clr32(bgep, SERDES_CONTROL_REG, SERDES_CONTROL_TX_DISABLE); bge_reg_put32(bgep, TX_1000BASEX_AUTONEG_REG, 0); bge_reg_set32(bgep, ETHERNET_MAC_MODE_REG, ETHERNET_MODE_SEND_CFGS); drv_usecwait(10); bge_reg_clr32(bgep, ETHERNET_MAC_MODE_REG, ETHERNET_MODE_SEND_CFGS); bgep->serdes_lpadv = AUTONEG_CODE_FAULT_ANEG_ERR; bgep->serdes_status = ~0U; } /* * Synchronise the SerDes speed/duplex/autonegotiation capabilities and * advertisements with the required settings as specified by the various * param_* variables that can be poked via the NDD interface. * * We always reinitalise the SerDes; this should cause the link to go down, * and then back up again once the link is stable and autonegotiation * (if enabled) is complete. We should get a link state change interrupt * somewhere along the way ... * * NOTE: SerDes only supports 1000FDX/HDX (with or without pause) so the * param_* variables relating to lower speeds are ignored. * * NOTE: must already be held by the caller */ static void bge_update_serdes(bge_t *bgep) { boolean_t adv_autoneg; boolean_t adv_pause; boolean_t adv_asym_pause; boolean_t adv_1000fdx; boolean_t adv_1000hdx; uint32_t serdes; uint32_t advert; BGE_TRACE(("bge_update_serdes($%p)", (void *)bgep)); ASSERT(mutex_owned(bgep->genlock)); BGE_DEBUG(("bge_update_serdes: autoneg %d " "pause %d asym_pause %d " "1000fdx %d 1000hdx %d " "100fdx %d 100hdx %d " "10fdx %d 10hdx %d ", bgep->param_adv_autoneg, bgep->param_adv_pause, bgep->param_adv_asym_pause, bgep->param_adv_1000fdx, bgep->param_adv_1000hdx, bgep->param_adv_100fdx, bgep->param_adv_100hdx, bgep->param_adv_10fdx, bgep->param_adv_10hdx)); serdes = advert = 0; /* * SerDes settings are normally based on the param_* variables, * but if any loopback mode is in effect, that takes precedence. * * BGE supports MAC-internal loopback, PHY-internal loopback, * and External loopback at a variety of speeds (with a special * cable). In all cases, autoneg is turned OFF, full-duplex * is turned ON, and the speed/mastership is forced. * * Note: for the SerDes interface, "PHY" internal loopback is * interpreted as SerDes internal loopback, and all external * loopback modes are treated equivalently, as 1Gb/external. */ switch (bgep->param_loop_mode) { case BGE_LOOP_NONE: default: adv_autoneg = bgep->param_adv_autoneg; adv_pause = bgep->param_adv_pause; adv_asym_pause = bgep->param_adv_asym_pause; adv_1000fdx = bgep->param_adv_1000fdx; adv_1000hdx = bgep->param_adv_1000hdx; break; case BGE_LOOP_INTERNAL_PHY: serdes |= SERDES_CONTROL_TBI_LOOPBACK; /* FALLTHRU */ case BGE_LOOP_INTERNAL_MAC: case BGE_LOOP_EXTERNAL_1000: case BGE_LOOP_EXTERNAL_100: case BGE_LOOP_EXTERNAL_10: adv_autoneg = adv_pause = adv_asym_pause = B_FALSE; adv_1000fdx = B_TRUE; adv_1000hdx = B_FALSE; break; } BGE_DEBUG(("bge_update_serdes: autoneg %d " "pause %d asym_pause %d " "1000fdx %d 1000hdx %d ", adv_autoneg, adv_pause, adv_asym_pause, adv_1000fdx, adv_1000hdx)); /* * We should have at least one gigabit technology capability * set; if not, we select a default of 1000Mb/s full-duplex */ if (!adv_1000fdx && !adv_1000hdx) adv_1000fdx = B_TRUE; /* * Now transform the adv_* variables into the proper settings * of the SerDes registers ... * * If autonegotiation is (now) not enabled, pretend it's been * done and failed ... */ if (!adv_autoneg) advert |= AUTONEG_CODE_FAULT_ANEG_ERR; if (adv_1000fdx) { advert |= AUTONEG_CODE_FULL_DUPLEX; bgep->param_adv_1000fdx = adv_1000fdx; bgep->param_link_duplex = LINK_DUPLEX_FULL; bgep->param_link_speed = 1000; } if (adv_1000hdx) { advert |= AUTONEG_CODE_HALF_DUPLEX; bgep->param_adv_1000hdx = adv_1000hdx; bgep->param_link_duplex = LINK_DUPLEX_HALF; bgep->param_link_speed = 1000; } if (adv_pause) advert |= AUTONEG_CODE_PAUSE; if (adv_asym_pause) advert |= AUTONEG_CODE_ASYM_PAUSE; /* * Restart the SerDes and write the new values. Note the * time, so that we can say whether subsequent link state * changes can be attributed to our reprogramming the SerDes */ bgep->serdes_advert = advert; bgep->phys_write_time = gethrtime(); bge_restart_serdes(bgep, B_FALSE); bge_reg_set32(bgep, SERDES_CONTROL_REG, serdes); BGE_DEBUG(("bge_update_serdes: serdes |= 0x%x, advert 0x%x", serdes, advert)); } /* * Bare-minimum autoneg protocol * * This code is only called when the link is up and we're receiving config * words, which implies that the link partner wants to autonegotiate * (otherwise, we wouldn't see configs and wouldn't reach this code). */ static void bge_autoneg_serdes(bge_t *bgep) { boolean_t ack; bgep->serdes_lpadv = bge_reg_get32(bgep, RX_1000BASEX_AUTONEG_REG); ack = BIS(bgep->serdes_lpadv, AUTONEG_CODE_ACKNOWLEDGE); if (!ack) { /* * Phase 1: after SerDes reset, we send a few zero configs * but then stop. Here the partner is sending configs, but * not ACKing ours; we assume that's 'cos we're not sending * any. So here we send ours, with ACK already set. */ bge_reg_put32(bgep, TX_1000BASEX_AUTONEG_REG, bgep->serdes_advert | AUTONEG_CODE_ACKNOWLEDGE); bge_reg_set32(bgep, ETHERNET_MAC_MODE_REG, ETHERNET_MODE_SEND_CFGS); } else { /* * Phase 2: partner has ACKed our configs, so now we can * stop sending; once our partner also stops sending, we * can resolve the Tx/Rx configs. */ bge_reg_clr32(bgep, ETHERNET_MAC_MODE_REG, ETHERNET_MODE_SEND_CFGS); } BGE_DEBUG(("bge_autoneg_serdes: Rx 0x%x %s Tx 0x%x", bgep->serdes_lpadv, ack ? "stop" : "send", bgep->serdes_advert)); } static boolean_t bge_check_serdes(bge_t *bgep, boolean_t recheck) { uint32_t emac_status; uint32_t lpadv; boolean_t linkup; for (;;) { /* * Step 10: read & clear the main (Ethernet) MAC status * (the relevant bits of this are write-one-to-clear). */ emac_status = bge_reg_get32(bgep, ETHERNET_MAC_STATUS_REG); bge_reg_put32(bgep, ETHERNET_MAC_STATUS_REG, emac_status); BGE_DEBUG(("bge_check_serdes: link %d/%s, " "MAC status 0x%x (was 0x%x)", bgep->link_state, UPORDOWN(bgep->param_link_up), emac_status, bgep->serdes_status)); /* * We will only consider the link UP if all the readings * are consistent and give meaningful results ... */ bgep->serdes_status = emac_status; linkup = BIS(emac_status, ETHERNET_STATUS_SIGNAL_DETECT); linkup &= BIS(emac_status, ETHERNET_STATUS_PCS_SYNCHED); /* * Now some fiddling with the interpretation: * if there's been an error at the PCS level, treat * it as a link change (the h/w doesn't do this) * * if there's been a change, but it's only a PCS sync * change (not a config change), AND the link already * was & is still UP, then ignore the change */ if (BIS(emac_status, ETHERNET_STATUS_PCS_ERROR)) emac_status |= ETHERNET_STATUS_LINK_CHANGED; else if (BIC(emac_status, ETHERNET_STATUS_CFG_CHANGED)) if (bgep->param_link_up && linkup) emac_status &= ~ETHERNET_STATUS_LINK_CHANGED; BGE_DEBUG(("bge_check_serdes: status 0x%x => 0x%x %s", bgep->serdes_status, emac_status, UPORDOWN(linkup))); /* * If we're receiving configs, run the autoneg protocol */ if (linkup && BIS(emac_status, ETHERNET_STATUS_RECEIVING_CFG)) bge_autoneg_serdes(bgep); /* * If the SerDes status hasn't changed, we're done ... */ if (BIC(emac_status, ETHERNET_STATUS_LINK_CHANGED)) break; /* * Record when the SerDes status changed, then go * round again until we no longer see a change ... */ bgep->phys_event_time = gethrtime(); recheck = B_TRUE; } /* * If we're not forcing a recheck (i.e. the link state was already * known), and we didn't see the hardware flag a change, there's * no more to do (and we tell the caller nothing happened). */ if (!recheck) return (B_FALSE); /* * Don't resolve autoneg until we're no longer receiving configs */ if (linkup && BIS(emac_status, ETHERNET_STATUS_RECEIVING_CFG)) return (B_FALSE); /* * Assume very little ... */ bgep->param_lp_autoneg = B_FALSE; bgep->param_lp_1000fdx = B_FALSE; bgep->param_lp_1000hdx = B_FALSE; bgep->param_lp_100fdx = B_FALSE; bgep->param_lp_100hdx = B_FALSE; bgep->param_lp_10fdx = B_FALSE; bgep->param_lp_10hdx = B_FALSE; bgep->param_lp_pause = B_FALSE; bgep->param_lp_asym_pause = B_FALSE; bgep->param_link_autoneg = B_FALSE; bgep->param_link_tx_pause = B_FALSE; if (bgep->param_adv_autoneg) bgep->param_link_rx_pause = B_FALSE; else bgep->param_link_rx_pause = bgep->param_adv_pause; /* * Discover all the link partner's abilities. */ lpadv = bgep->serdes_lpadv; if (lpadv != 0 && BIC(lpadv, AUTONEG_CODE_FAULT_MASK)) { /* * No fault, so derive partner's capabilities */ bgep->param_lp_autoneg = B_TRUE; bgep->param_lp_1000fdx = BIS(lpadv, AUTONEG_CODE_FULL_DUPLEX); bgep->param_lp_1000hdx = BIS(lpadv, AUTONEG_CODE_HALF_DUPLEX); bgep->param_lp_pause = BIS(lpadv, AUTONEG_CODE_PAUSE); bgep->param_lp_asym_pause = BIS(lpadv, AUTONEG_CODE_ASYM_PAUSE); /* * Pause direction resolution */ bgep->param_link_autoneg = B_TRUE; if (bgep->param_adv_pause && bgep->param_lp_pause) { bgep->param_link_tx_pause = B_TRUE; bgep->param_link_rx_pause = B_TRUE; } if (bgep->param_adv_asym_pause && bgep->param_lp_asym_pause) { if (bgep->param_adv_pause) bgep->param_link_rx_pause = B_TRUE; if (bgep->param_lp_pause) bgep->param_link_tx_pause = B_TRUE; } } /* * Step 12: update ndd-visible state parameters, BUT! * we don't transfer the new state to just yet; * instead we mark the as UNKNOWN, and our caller * will resolve it once the status has stopped changing and * been stable for several seconds. */ BGE_DEBUG(("bge_check_serdes: link was %s speed %d duplex %d", UPORDOWN(bgep->param_link_up), bgep->param_link_speed, bgep->param_link_duplex)); if (linkup) { bgep->param_link_up = B_TRUE; bgep->param_link_speed = 1000; if (bgep->param_adv_1000fdx) bgep->param_link_duplex = LINK_DUPLEX_FULL; else bgep->param_link_duplex = LINK_DUPLEX_HALF; if (bgep->param_lp_autoneg && !bgep->param_lp_1000fdx) bgep->param_link_duplex = LINK_DUPLEX_HALF; } else { bgep->param_link_up = B_FALSE; bgep->param_link_speed = 0; bgep->param_link_duplex = LINK_DUPLEX_UNKNOWN; } switch (bgep->param_link_duplex) { default: case LINK_DUPLEX_UNKNOWN: bgep->link_mode_msg = "down"; break; case LINK_DUPLEX_HALF: bgep->link_mode_msg = "up 1000Mbps Half-Duplex"; break; case LINK_DUPLEX_FULL: bgep->link_mode_msg = "up 1000Mbps Full-Duplex"; break; } bgep->link_state = LINK_STATE_UNKNOWN; BGE_DEBUG(("bge_check_serdes: link now %s speed %d duplex %d", UPORDOWN(bgep->param_link_up), bgep->param_link_speed, bgep->param_link_duplex)); return (B_TRUE); } static const phys_ops_t serdes_ops = { bge_restart_serdes, bge_update_serdes, bge_check_serdes }; /* * ========== Exported physical layer control routines ========== */ #undef BGE_DBG #define BGE_DBG BGE_DBG_PHYS /* debug flag for this code */ /* * Here we have to determine which media we're using (copper or serdes). * Once that's done, we can initialise the physical layer appropriately. */ void bge_phys_init(bge_t *bgep) { BGE_TRACE(("bge_phys_init($%p)", (void *)bgep)); mutex_enter(bgep->genlock); /* * Probe for the (internal) PHY. If it's not there, we'll assume * that this is a 5703/4S, with a SerDes interface rather than * a PHY. BCM5714S/BCM5715S are not supported.It are based on * BCM800x PHY. */ bgep->phy_mii_addr = 1; if (bge_phy_probe(bgep)) { bgep->chipid.flags &= ~CHIP_FLAG_SERDES; bgep->phys_delta_time = BGE_PHY_STABLE_TIME; bgep->physops = &copper_ops; } else { bgep->chipid.flags |= CHIP_FLAG_SERDES; bgep->phys_delta_time = BGE_SERDES_STABLE_TIME; bgep->physops = &serdes_ops; } (*bgep->physops->phys_restart)(bgep, B_FALSE); mutex_exit(bgep->genlock); } /* * Reset the physical layer */ void bge_phys_reset(bge_t *bgep) { BGE_TRACE(("bge_phys_reset($%p)", (void *)bgep)); mutex_enter(bgep->genlock); (*bgep->physops->phys_restart)(bgep, B_FALSE); mutex_exit(bgep->genlock); } /* * Reset and power off the physical layer. * * Another RESET should get it back to working, but it may take a few * seconds it may take a few moments to return to normal operation ... */ void bge_phys_idle(bge_t *bgep) { BGE_TRACE(("bge_phys_idle($%p)", (void *)bgep)); ASSERT(mutex_owned(bgep->genlock)); (*bgep->physops->phys_restart)(bgep, B_TRUE); } /* * Synchronise the PHYSICAL layer's speed/duplex/autonegotiation capabilities * and advertisements with the required settings as specified by the various * param_* variables that can be poked via the NDD interface. * * We always reset the PHYSICAL layer and reprogram *all* relevant registers. * This is expected to cause the link to go down, and then back up again once * the link is stable and autonegotiation (if enabled) is complete. We should * get a link state change interrupt somewhere along the way ... * * NOTE: must already be held by the caller */ void bge_phys_update(bge_t *bgep) { BGE_TRACE(("bge_phys_update($%p)", (void *)bgep)); ASSERT(mutex_owned(bgep->genlock)); (*bgep->physops->phys_update)(bgep); } #undef BGE_DBG #define BGE_DBG BGE_DBG_LINK /* debug flag for this code */ /* * Read the link status and determine whether anything's changed ... * * This routine should be called whenever the chip flags a change * in the hardware link state, and repeatedly for several seconds * afterwards, until we're sure the state has stabilised (sometimes * it goes up and down several times during autonegotiation before * settling on the proper configuration). This routine applies * timing-based heuristics to determine when the state is stable. * * This routine returns B_FALSE if the link state has not changed, * or if it has changed, but hasn't settled for long enough yet. It * returns B_TRUE when the change to the new state should be accepted. * In such a case, the param_* variables give the new hardware state, * which the caller should use to update link_state etc. * * The caller must already hold */ boolean_t bge_phys_check(bge_t *bgep) { int32_t orig_state; boolean_t recheck; boolean_t linkup; hrtime_t deltat; hrtime_t now; BGE_TRACE(("bge_phys_check($%p)", (void *)bgep)); ASSERT(mutex_owned(bgep->genlock)); linkup = bgep->param_link_up; orig_state = bgep->link_state; recheck = orig_state == LINK_STATE_UNKNOWN; recheck = (*bgep->physops->phys_check)(bgep, recheck); if (!recheck) return (B_FALSE); /* * At this point, the check_*_link() function above has detected * a change and updated the param_* variables to show what the * latest hardware state seems to be -- but it might still be * changing. * * The link_state must now be UNKNOWN, but if it was previously * UP, we want to recognise this immediately, whereas in any other * case (e.g. DOWN->UP) we don't accept it until a few seconds have * elapsed, to give the hardware time to settle. */ now = gethrtime(); deltat = now - bgep->phys_event_time; BGE_DEBUG(("bge_phys_check: link was %d/%s now %d/%s", orig_state, UPORDOWN(linkup), bgep->link_state, UPORDOWN(bgep->param_link_up))); BGE_DEBUG(("bge_phys_check: update %lld change %lld " "now %lld delta %lld", bgep->phys_write_time, bgep->phys_event_time, now, deltat)); if (orig_state == LINK_STATE_UP) return (B_TRUE); else return (deltat > bgep->phys_delta_time); }