/*************************************************************************
Copyright (c) 2003-2007  Cavium Networks (support@cavium.com). All rights
reserved.


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.

    * Neither the name of Cavium Networks nor the names of
      its contributors may be used to endorse or promote products
      derived from this software without specific prior written
      permission.

This Software, including technical data, may be subject to U.S. export  control laws, including the U.S. Export Administration Act and its  associated regulations, and may be subject to export or import  regulations in other countries.

TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
AND WITH ALL FAULTS AND CAVIUM  NETWORKS MAKES NO PROMISES, REPRESENTATIONS OR WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH RESPECT TO THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY REPRESENTATION OR DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT DEFECTS, AND CAVIUM SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES OF TITLE, MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR PURPOSE, LACK OF VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET POSSESSION OR CORRESPONDENCE TO DESCRIPTION. THE ENTIRE  RISK ARISING OUT OF USE OR PERFORMANCE OF THE SOFTWARE LIES WITH YOU.

*************************************************************************/

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.0.0/sys/mips/cavium/octe/ethernet-spi.c 210311 2010-07-20 19:25:11Z jmallett $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/endian.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/rman.h>
#include <sys/socket.h>

#include <net/ethernet.h>
#include <net/if.h>

#include "wrapper-cvmx-includes.h"
#include "ethernet-headers.h"

#include "octebusvar.h"

static int number_spi_ports;
static int need_retrain[2] = {0, 0};

static int cvm_oct_spi_rml_interrupt(void *dev_id)
{
	int return_status = FILTER_STRAY;
	cvmx_npi_rsl_int_blocks_t rsl_int_blocks;

	/* Check and see if this interrupt was caused by the GMX block */
	rsl_int_blocks.u64 = cvmx_read_csr(CVMX_NPI_RSL_INT_BLOCKS);
	if (rsl_int_blocks.s.spx1) { /* 19 - SPX1_INT_REG & STX1_INT_REG */

		cvmx_spxx_int_reg_t spx_int_reg;
		cvmx_stxx_int_reg_t stx_int_reg;

		spx_int_reg.u64 = cvmx_read_csr(CVMX_SPXX_INT_REG(1));
		cvmx_write_csr(CVMX_SPXX_INT_REG(1), spx_int_reg.u64);
		if (!need_retrain[1]) {

			spx_int_reg.u64 &= cvmx_read_csr(CVMX_SPXX_INT_MSK(1));
			if (spx_int_reg.s.spf)
				printf("SPI1: SRX Spi4 interface down\n");
			if (spx_int_reg.s.calerr)
				printf("SPI1: SRX Spi4 Calendar table parity error\n");
			if (spx_int_reg.s.syncerr)
				printf("SPI1: SRX Consecutive Spi4 DIP4 errors have exceeded SPX_ERR_CTL[ERRCNT]\n");
			if (spx_int_reg.s.diperr)
				printf("SPI1: SRX Spi4 DIP4 error\n");
			if (spx_int_reg.s.tpaovr)
				printf("SPI1: SRX Selected port has hit TPA overflow\n");
			if (spx_int_reg.s.rsverr)
				printf("SPI1: SRX Spi4 reserved control word detected\n");
			if (spx_int_reg.s.drwnng)
				printf("SPI1: SRX Spi4 receive FIFO drowning/overflow\n");
			if (spx_int_reg.s.clserr)
				printf("SPI1: SRX Spi4 packet closed on non-16B alignment without EOP\n");
			if (spx_int_reg.s.spiovr)
				printf("SPI1: SRX Spi4 async FIFO overflow\n");
			if (spx_int_reg.s.abnorm)
				printf("SPI1: SRX Abnormal packet termination (ERR bit)\n");
			if (spx_int_reg.s.prtnxa)
				printf("SPI1: SRX Port out of range\n");
		}

		stx_int_reg.u64 = cvmx_read_csr(CVMX_STXX_INT_REG(1));
		cvmx_write_csr(CVMX_STXX_INT_REG(1), stx_int_reg.u64);
		if (!need_retrain[1]) {

			stx_int_reg.u64 &= cvmx_read_csr(CVMX_STXX_INT_MSK(1));
			if (stx_int_reg.s.syncerr)
				printf("SPI1: STX Interface encountered a fatal error\n");
			if (stx_int_reg.s.frmerr)
				printf("SPI1: STX FRMCNT has exceeded STX_DIP_CNT[MAXFRM]\n");
			if (stx_int_reg.s.unxfrm)
				printf("SPI1: STX Unexpected framing sequence\n");
			if (stx_int_reg.s.nosync)
				printf("SPI1: STX ERRCNT has exceeded STX_DIP_CNT[MAXDIP]\n");
			if (stx_int_reg.s.diperr)
				printf("SPI1: STX DIP2 error on the Spi4 Status channel\n");
			if (stx_int_reg.s.datovr)
				printf("SPI1: STX Spi4 FIFO overflow error\n");
			if (stx_int_reg.s.ovrbst)
				printf("SPI1: STX Transmit packet burst too big\n");
			if (stx_int_reg.s.calpar1)
				printf("SPI1: STX Calendar Table Parity Error Bank1\n");
			if (stx_int_reg.s.calpar0)
				printf("SPI1: STX Calendar Table Parity Error Bank0\n");
		}

		cvmx_write_csr(CVMX_SPXX_INT_MSK(1), 0);
		cvmx_write_csr(CVMX_STXX_INT_MSK(1), 0);
		need_retrain[1] = 1;
		return_status = FILTER_HANDLED;
	}

	if (rsl_int_blocks.s.spx0) { /* 18 - SPX0_INT_REG & STX0_INT_REG */
		cvmx_spxx_int_reg_t spx_int_reg;
		cvmx_stxx_int_reg_t stx_int_reg;

		spx_int_reg.u64 = cvmx_read_csr(CVMX_SPXX_INT_REG(0));
		cvmx_write_csr(CVMX_SPXX_INT_REG(0), spx_int_reg.u64);
		if (!need_retrain[0]) {

			spx_int_reg.u64 &= cvmx_read_csr(CVMX_SPXX_INT_MSK(0));
			if (spx_int_reg.s.spf)
				printf("SPI0: SRX Spi4 interface down\n");
			if (spx_int_reg.s.calerr)
				printf("SPI0: SRX Spi4 Calendar table parity error\n");
			if (spx_int_reg.s.syncerr)
				printf("SPI0: SRX Consecutive Spi4 DIP4 errors have exceeded SPX_ERR_CTL[ERRCNT]\n");
			if (spx_int_reg.s.diperr)
				printf("SPI0: SRX Spi4 DIP4 error\n");
			if (spx_int_reg.s.tpaovr)
				printf("SPI0: SRX Selected port has hit TPA overflow\n");
			if (spx_int_reg.s.rsverr)
				printf("SPI0: SRX Spi4 reserved control word detected\n");
			if (spx_int_reg.s.drwnng)
				printf("SPI0: SRX Spi4 receive FIFO drowning/overflow\n");
			if (spx_int_reg.s.clserr)
				printf("SPI0: SRX Spi4 packet closed on non-16B alignment without EOP\n");
			if (spx_int_reg.s.spiovr)
				printf("SPI0: SRX Spi4 async FIFO overflow\n");
			if (spx_int_reg.s.abnorm)
				printf("SPI0: SRX Abnormal packet termination (ERR bit)\n");
			if (spx_int_reg.s.prtnxa)
				printf("SPI0: SRX Port out of range\n");
		}

		stx_int_reg.u64 = cvmx_read_csr(CVMX_STXX_INT_REG(0));
		cvmx_write_csr(CVMX_STXX_INT_REG(0), stx_int_reg.u64);
		if (!need_retrain[0]) {

			stx_int_reg.u64 &= cvmx_read_csr(CVMX_STXX_INT_MSK(0));
			if (stx_int_reg.s.syncerr)
				printf("SPI0: STX Interface encountered a fatal error\n");
			if (stx_int_reg.s.frmerr)
				printf("SPI0: STX FRMCNT has exceeded STX_DIP_CNT[MAXFRM]\n");
			if (stx_int_reg.s.unxfrm)
				printf("SPI0: STX Unexpected framing sequence\n");
			if (stx_int_reg.s.nosync)
				printf("SPI0: STX ERRCNT has exceeded STX_DIP_CNT[MAXDIP]\n");
			if (stx_int_reg.s.diperr)
				printf("SPI0: STX DIP2 error on the Spi4 Status channel\n");
			if (stx_int_reg.s.datovr)
				printf("SPI0: STX Spi4 FIFO overflow error\n");
			if (stx_int_reg.s.ovrbst)
				printf("SPI0: STX Transmit packet burst too big\n");
			if (stx_int_reg.s.calpar1)
				printf("SPI0: STX Calendar Table Parity Error Bank1\n");
			if (stx_int_reg.s.calpar0)
				printf("SPI0: STX Calendar Table Parity Error Bank0\n");
		}

		cvmx_write_csr(CVMX_SPXX_INT_MSK(0), 0);
		cvmx_write_csr(CVMX_STXX_INT_MSK(0), 0);
		need_retrain[0] = 1;
		return_status = FILTER_HANDLED;
	}

	return return_status;
}

static void cvm_oct_spi_enable_error_reporting(int interface)
{
	cvmx_spxx_int_msk_t spxx_int_msk;
	cvmx_stxx_int_msk_t stxx_int_msk;

	spxx_int_msk.u64 = cvmx_read_csr(CVMX_SPXX_INT_MSK(interface));
	spxx_int_msk.s.calerr = 1;
	spxx_int_msk.s.syncerr = 1;
	spxx_int_msk.s.diperr = 1;
	spxx_int_msk.s.tpaovr = 1;
	spxx_int_msk.s.rsverr = 1;
	spxx_int_msk.s.drwnng = 1;
	spxx_int_msk.s.clserr = 1;
	spxx_int_msk.s.spiovr = 1;
	spxx_int_msk.s.abnorm = 1;
	spxx_int_msk.s.prtnxa = 1;
	cvmx_write_csr(CVMX_SPXX_INT_MSK(interface), spxx_int_msk.u64);

	stxx_int_msk.u64 = cvmx_read_csr(CVMX_STXX_INT_MSK(interface));
	stxx_int_msk.s.frmerr = 1;
	stxx_int_msk.s.unxfrm = 1;
	stxx_int_msk.s.nosync = 1;
	stxx_int_msk.s.diperr = 1;
	stxx_int_msk.s.datovr = 1;
	stxx_int_msk.s.ovrbst = 1;
	stxx_int_msk.s.calpar1 = 1;
	stxx_int_msk.s.calpar0 = 1;
	cvmx_write_csr(CVMX_STXX_INT_MSK(interface), stxx_int_msk.u64);
}

static void cvm_oct_spi_poll(struct ifnet *ifp)
{
	static int spi4000_port;
	cvm_oct_private_t *priv = (cvm_oct_private_t *)ifp->if_softc;
	int interface;

	for (interface = 0; interface < 2; interface++) {

		if ((priv->port == interface*16) && need_retrain[interface]) {

			if (cvmx_spi_restart_interface(interface, CVMX_SPI_MODE_DUPLEX, 10) == 0) {
				need_retrain[interface] = 0;
				cvm_oct_spi_enable_error_reporting(interface);
			}
		}

		/* The SPI4000 TWSI interface is very slow. In order not to
		   bring the system to a crawl, we only poll a single port
		   every second. This means negotiation speed changes
		   take up to 10 seconds, but at least we don't waste
		   absurd amounts of time waiting for TWSI */
		if (priv->port == spi4000_port) {
			/* This function does nothing if it is called on an
			   interface without a SPI4000 */
			cvmx_spi4000_check_speed(interface, priv->port);
			/* Normal ordering increments. By decrementing
			   we only match once per iteration */
			spi4000_port--;
			if (spi4000_port < 0)
				spi4000_port = 10;
		}
	}
}


int cvm_oct_spi_init(struct ifnet *ifp)
{
	struct octebus_softc *sc;
	cvm_oct_private_t *priv = (cvm_oct_private_t *)ifp->if_softc;
	int error;
	int rid;

	if (number_spi_ports == 0) {
		sc = device_get_softc(device_get_parent(priv->dev));

		rid = 0;
		sc->sc_spi_irq = bus_alloc_resource(sc->sc_dev, SYS_RES_IRQ,
						    &rid, CVMX_IRQ_RML,
						    CVMX_IRQ_RML, 1,
						    RF_ACTIVE);
		if (sc->sc_spi_irq == NULL) {
			device_printf(sc->sc_dev, "could not allocate SPI irq");
			return ENXIO;
		}

		error = bus_setup_intr(sc->sc_dev, sc->sc_spi_irq,
				       INTR_TYPE_NET | INTR_MPSAFE,
				       cvm_oct_spi_rml_interrupt, NULL,
				       &number_spi_ports, NULL);
		if (error != 0) {
			device_printf(sc->sc_dev, "could not setup SPI irq");
			return error;
		}
	}
	number_spi_ports++;

	if ((priv->port == 0) || (priv->port == 16)) {
		cvm_oct_spi_enable_error_reporting(INTERFACE(priv->port));
		priv->poll = cvm_oct_spi_poll;
	}
	cvm_oct_common_init(ifp);
	return 0;
}

void cvm_oct_spi_uninit(struct ifnet *ifp)
{
	int interface;

	cvm_oct_common_uninit(ifp);
	number_spi_ports--;
	if (number_spi_ports == 0) {
		for (interface = 0; interface < 2; interface++) {
			cvmx_write_csr(CVMX_SPXX_INT_MSK(interface), 0);
			cvmx_write_csr(CVMX_STXX_INT_MSK(interface), 0);
		}
		panic("%s: IRQ release not yet implemented.", __func__);
	}
}
