/*-
 * Copyright (c) 1994-1997 Matt Thomas (matt@3am-software.com)
 * Copyright (c) LAN Media Corporation 1998, 1999.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $FreeBSD$
 *      From NetBSD: if_de.c,v 1.56.2.1 1997/10/27 02:13:25 thorpej Exp
 *	$Id: if_lmc_common.c,v 1.12 1999/03/01 15:22:37 explorer Exp $
 */

/*
 * the dec chip has its own idea of what a receive error is, but we don't
 * want to use it, as it will get the crc error wrong when 16-bit
 * crcs are used.  So, we only care about certain conditions.
 */
#ifndef TULIP_DSTS_RxMIIERR
#define TULIP_DSTS_RxMIIERR 0x00000008
#endif
#define LMC_DSTS_ERRSUM (TULIP_DSTS_RxMIIERR)

static void
lmc_gpio_mkinput(lmc_softc_t * const sc, u_int32_t bits)
{
	sc->lmc_gpio_io &= ~bits;
	LMC_CSR_WRITE(sc, csr_gp, TULIP_GP_PINSET | (sc->lmc_gpio_io));
}

static void
lmc_gpio_mkoutput(lmc_softc_t * const sc, u_int32_t bits)
{
	sc->lmc_gpio_io |= bits;
	LMC_CSR_WRITE(sc, csr_gp, TULIP_GP_PINSET | (sc->lmc_gpio_io));
}

static void
lmc_led_on(lmc_softc_t * const sc, u_int32_t led)
{
	sc->lmc_miireg16 &= ~led;
	lmc_mii_writereg(sc, 0, 16, sc->lmc_miireg16);
}

static void
lmc_led_off(lmc_softc_t * const sc, u_int32_t led)
{
	sc->lmc_miireg16 |= led;
	lmc_mii_writereg(sc, 0, 16, sc->lmc_miireg16);
}

static void
lmc_reset(lmc_softc_t * const sc)
{
	sc->lmc_miireg16 |= LMC_MII16_FIFO_RESET;
	lmc_mii_writereg(sc, 0, 16, sc->lmc_miireg16);

	sc->lmc_miireg16 &= ~LMC_MII16_FIFO_RESET;
	lmc_mii_writereg(sc, 0, 16, sc->lmc_miireg16);

	/*
	 * make some of the GPIO pins be outputs
	 */
	lmc_gpio_mkoutput(sc, LMC_GEP_DP | LMC_GEP_RESET);

	/*
	 * drive DP and RESET low to force configuration.  This also forces
	 * the transmitter clock to be internal, but we expect to reset
	 * that later anyway.
	 */
	sc->lmc_gpio &= ~(LMC_GEP_DP | LMC_GEP_RESET);
	LMC_CSR_WRITE(sc, csr_gp, sc->lmc_gpio);

	/*
	 * hold for more than 10 microseconds
	 */
	DELAY(50);

	/*
	 * stop driving Xilinx-related signals
	 */
	lmc_gpio_mkinput(sc, LMC_GEP_DP | LMC_GEP_RESET);

	/*
	 * busy wait for the chip to reset
	 */
	while ((LMC_CSR_READ(sc, csr_gp) & LMC_GEP_DP) == 0)
		;

	/*
	 * Call media specific init routine
	 */
	sc->lmc_media->init(sc);
}

static void
lmc_dec_reset(lmc_softc_t * const sc)
{
#ifndef __linux__
	lmc_ringinfo_t *ri;
	tulip_desc_t *di;
#endif
	u_int32_t val;

	/*
	 * disable all interrupts
	 */
	sc->lmc_intrmask = 0;
	LMC_CSR_WRITE(sc, csr_intr, sc->lmc_intrmask);

	/*
	 * we are, obviously, down.
	 */
#ifndef __linux__
	sc->lmc_flags &= ~(LMC_IFUP | LMC_MODEMOK);

	DP(("lmc_dec_reset\n"));
#endif

	/*
	 * Reset the chip with a software reset command.
	 * Wait 10 microseconds (actually 50 PCI cycles but at 
	 * 33MHz that comes to two microseconds but wait a
	 * bit longer anyways)
	 */
	LMC_CSR_WRITE(sc, csr_busmode, TULIP_BUSMODE_SWRESET);
	DELAY(10);
	sc->lmc_cmdmode = LMC_CSR_READ(sc, csr_command);

	/*
	 * We want:
	 *   no ethernet address in frames we write
	 *   disable padding (txdesc, padding disable)
	 *   ignore runt frames (rdes0 bit 15)
	 *   no receiver watchdog or transmitter jabber timer
	 *       (csr15 bit 0,14 == 1)
	 *   if using 16-bit CRC, turn off CRC (trans desc, crc disable)
	 */

#ifndef TULIP_CMD_RECEIVEALL
#define TULIP_CMD_RECEIVEALL 0x40000000L
#endif

	sc->lmc_cmdmode |= ( TULIP_CMD_PROMISCUOUS
			       | TULIP_CMD_FULLDUPLEX
			       | TULIP_CMD_PASSBADPKT
			       | TULIP_CMD_NOHEARTBEAT
			       | TULIP_CMD_PORTSELECT
			       | TULIP_CMD_RECEIVEALL
			       | TULIP_CMD_MUSTBEONE
			       );
	sc->lmc_cmdmode &= ~( TULIP_CMD_OPERMODE
				| TULIP_CMD_THRESHOLDCTL
				| TULIP_CMD_STOREFWD
				| TULIP_CMD_TXTHRSHLDCTL
				);

	LMC_CSR_WRITE(sc, csr_command, sc->lmc_cmdmode);

	/*
	 * disable receiver watchdog and transmit jabber
	 */
	val = LMC_CSR_READ(sc, csr_sia_general);
	val |= (TULIP_WATCHDOG_TXDISABLE | TULIP_WATCHDOG_RXDISABLE);
	LMC_CSR_WRITE(sc, csr_sia_general, val);

	/*
	 * turn off those LEDs...
	 */
	sc->lmc_miireg16 |= LMC_MII16_LED_ALL;
	lmc_led_on(sc, LMC_MII16_LED0);

#ifndef __linux__
	/*
	 * reprogram the tx desc, rx desc, and PCI bus options
	 */
	LMC_CSR_WRITE(sc, csr_txlist,
			LMC_KVATOPHYS(sc, &sc->lmc_txinfo.ri_first[0]));
	LMC_CSR_WRITE(sc, csr_rxlist,
			LMC_KVATOPHYS(sc, &sc->lmc_rxinfo.ri_first[0]));
	LMC_CSR_WRITE(sc, csr_busmode,
			(1 << (LMC_BURSTSIZE(sc->lmc_unit) + 8))
			|TULIP_BUSMODE_CACHE_ALIGN8
			|TULIP_BUSMODE_READMULTIPLE
			|(BYTE_ORDER != LITTLE_ENDIAN ? TULIP_BUSMODE_BIGENDIAN : 0));

	sc->lmc_txq.ifq_maxlen = LMC_TXDESCS;

	/*
	 * Free all the mbufs that were on the transmit ring.
	 */
	for (;;) {
		struct mbuf *m;

		_IF_DEQUEUE(&sc->lmc_txq, m);
		if (m == NULL)
			break;
		m_freem(m);
	}

	/*
	 * reset descriptor state and reclaim all descriptors.
	 */
	ri = &sc->lmc_txinfo;
	ri->ri_nextin = ri->ri_nextout = ri->ri_first;
	ri->ri_free = ri->ri_max;
	for (di = ri->ri_first; di < ri->ri_last; di++)
		di->d_status = 0;

	/*
	 * We need to collect all the mbufs were on the 
	 * receive ring before we reinit it either to put
	 * them back on or to know if we have to allocate
	 * more.
	 */
	ri = &sc->lmc_rxinfo;
	ri->ri_nextin = ri->ri_nextout = ri->ri_first;
	ri->ri_free = ri->ri_max;
	for (di = ri->ri_first; di < ri->ri_last; di++) {
		di->d_status = 0;
		di->d_length1 = 0; di->d_addr1 = 0;
		di->d_length2 = 0; di->d_addr2 = 0;
	}
	for (;;) {
		struct mbuf *m;
		_IF_DEQUEUE(&sc->lmc_rxq, m);
		if (m == NULL)
			break;
		m_freem(m);
	}
#endif
}

static void
lmc_initcsrs(lmc_softc_t * const sc, lmc_csrptr_t csr_base,
	     size_t csr_size)
{
	sc->lmc_csrs.csr_busmode	= csr_base +  0 * csr_size;
	sc->lmc_csrs.csr_txpoll		= csr_base +  1 * csr_size;
	sc->lmc_csrs.csr_rxpoll		= csr_base +  2 * csr_size;
	sc->lmc_csrs.csr_rxlist		= csr_base +  3 * csr_size;
	sc->lmc_csrs.csr_txlist		= csr_base +  4 * csr_size;
	sc->lmc_csrs.csr_status		= csr_base +  5 * csr_size;
	sc->lmc_csrs.csr_command	= csr_base +  6 * csr_size;
	sc->lmc_csrs.csr_intr		= csr_base +  7 * csr_size;
	sc->lmc_csrs.csr_missed_frames	= csr_base +  8 * csr_size;
	sc->lmc_csrs.csr_9		= csr_base +  9 * csr_size;
	sc->lmc_csrs.csr_10		= csr_base + 10 * csr_size;
	sc->lmc_csrs.csr_11		= csr_base + 11 * csr_size;
	sc->lmc_csrs.csr_12		= csr_base + 12 * csr_size;
	sc->lmc_csrs.csr_13		= csr_base + 13 * csr_size;
	sc->lmc_csrs.csr_14		= csr_base + 14 * csr_size;
	sc->lmc_csrs.csr_15		= csr_base + 15 * csr_size;
}