Initial import

1 files changed, 292 insertions, 0 deletions

diff --git a/drivers/staging/octeon/ethernet-spi.c b/drivers/staging/octeon/ethernet-spi.c
new file mode 100644
index 000000000..5108bc0bb
--- /dev/null
+++ b/drivers/staging/octeon/ethernet-spi.c
@@ -0,0 +1,292 @@
+/**********************************************************************
+ * Author: Cavium Networks
+ *
+ * Contact: support@caviumnetworks.com
+ * This file is part of the OCTEON SDK
+ *
+ * Copyright (c) 2003-2007 Cavium Networks
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, Version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
+ * NONINFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this file; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ * or visit http://www.gnu.org/licenses/.
+ *
+ * This file may also be available under a different license from Cavium.
+ * Contact Cavium Networks for more information
+**********************************************************************/
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/interrupt.h>
+#include <net/dst.h>
+
+#include <asm/octeon/octeon.h>
+
+#include "ethernet-defines.h"
+#include "octeon-ethernet.h"
+#include "ethernet-util.h"
+
+#include <asm/octeon/cvmx-spi.h>
+
+#include <asm/octeon/cvmx-npi-defs.h>
+#include <asm/octeon/cvmx-spxx-defs.h>
+#include <asm/octeon/cvmx-stxx-defs.h>
+
+static int number_spi_ports;
+static int need_retrain[2] = { 0, 0 };
+
+static irqreturn_t cvm_oct_spi_rml_interrupt(int cpl, void *dev_id)
+{
+	irqreturn_t return_status = IRQ_NONE;
+	union cvmx_npi_rsl_int_blocks 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 */
+
+		union cvmx_spxx_int_reg spx_int_reg;
+		union cvmx_stxx_int_reg 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)
+				pr_err("SPI1: SRX Spi4 interface down\n");
+			if (spx_int_reg.s.calerr)
+				pr_err("SPI1: SRX Spi4 Calendar table parity error\n");
+			if (spx_int_reg.s.syncerr)
+				pr_err("SPI1: SRX Consecutive Spi4 DIP4 errors have exceeded SPX_ERR_CTL[ERRCNT]\n");
+			if (spx_int_reg.s.diperr)
+				pr_err("SPI1: SRX Spi4 DIP4 error\n");
+			if (spx_int_reg.s.tpaovr)
+				pr_err("SPI1: SRX Selected port has hit TPA overflow\n");
+			if (spx_int_reg.s.rsverr)
+				pr_err("SPI1: SRX Spi4 reserved control word detected\n");
+			if (spx_int_reg.s.drwnng)
+				pr_err("SPI1: SRX Spi4 receive FIFO drowning/overflow\n");
+			if (spx_int_reg.s.clserr)
+				pr_err("SPI1: SRX Spi4 packet closed on non-16B alignment without EOP\n");
+			if (spx_int_reg.s.spiovr)
+				pr_err("SPI1: SRX Spi4 async FIFO overflow\n");
+			if (spx_int_reg.s.abnorm)
+				pr_err("SPI1: SRX Abnormal packet termination (ERR bit)\n");
+			if (spx_int_reg.s.prtnxa)
+				pr_err("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)
+				pr_err("SPI1: STX Interface encountered a fatal error\n");
+			if (stx_int_reg.s.frmerr)
+				pr_err("SPI1: STX FRMCNT has exceeded STX_DIP_CNT[MAXFRM]\n");
+			if (stx_int_reg.s.unxfrm)
+				pr_err("SPI1: STX Unexpected framing sequence\n");
+			if (stx_int_reg.s.nosync)
+				pr_err("SPI1: STX ERRCNT has exceeded STX_DIP_CNT[MAXDIP]\n");
+			if (stx_int_reg.s.diperr)
+				pr_err("SPI1: STX DIP2 error on the Spi4 Status channel\n");
+			if (stx_int_reg.s.datovr)
+				pr_err("SPI1: STX Spi4 FIFO overflow error\n");
+			if (stx_int_reg.s.ovrbst)
+				pr_err("SPI1: STX Transmit packet burst too big\n");
+			if (stx_int_reg.s.calpar1)
+				pr_err("SPI1: STX Calendar Table Parity Error Bank1\n");
+			if (stx_int_reg.s.calpar0)
+				pr_err("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 = IRQ_HANDLED;
+	}
+
+	if (rsl_int_blocks.s.spx0) {	/* 18 - SPX0_INT_REG & STX0_INT_REG */
+		union cvmx_spxx_int_reg spx_int_reg;
+		union cvmx_stxx_int_reg 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)
+				pr_err("SPI0: SRX Spi4 interface down\n");
+			if (spx_int_reg.s.calerr)
+				pr_err("SPI0: SRX Spi4 Calendar table parity error\n");
+			if (spx_int_reg.s.syncerr)
+				pr_err("SPI0: SRX Consecutive Spi4 DIP4 errors have exceeded SPX_ERR_CTL[ERRCNT]\n");
+			if (spx_int_reg.s.diperr)
+				pr_err("SPI0: SRX Spi4 DIP4 error\n");
+			if (spx_int_reg.s.tpaovr)
+				pr_err("SPI0: SRX Selected port has hit TPA overflow\n");
+			if (spx_int_reg.s.rsverr)
+				pr_err("SPI0: SRX Spi4 reserved control word detected\n");
+			if (spx_int_reg.s.drwnng)
+				pr_err("SPI0: SRX Spi4 receive FIFO drowning/overflow\n");
+			if (spx_int_reg.s.clserr)
+				pr_err("SPI0: SRX Spi4 packet closed on non-16B alignment without EOP\n");
+			if (spx_int_reg.s.spiovr)
+				pr_err("SPI0: SRX Spi4 async FIFO overflow\n");
+			if (spx_int_reg.s.abnorm)
+				pr_err("SPI0: SRX Abnormal packet termination (ERR bit)\n");
+			if (spx_int_reg.s.prtnxa)
+				pr_err("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)
+				pr_err("SPI0: STX Interface encountered a fatal error\n");
+			if (stx_int_reg.s.frmerr)
+				pr_err("SPI0: STX FRMCNT has exceeded STX_DIP_CNT[MAXFRM]\n");
+			if (stx_int_reg.s.unxfrm)
+				pr_err("SPI0: STX Unexpected framing sequence\n");
+			if (stx_int_reg.s.nosync)
+				pr_err("SPI0: STX ERRCNT has exceeded STX_DIP_CNT[MAXDIP]\n");
+			if (stx_int_reg.s.diperr)
+				pr_err("SPI0: STX DIP2 error on the Spi4 Status channel\n");
+			if (stx_int_reg.s.datovr)
+				pr_err("SPI0: STX Spi4 FIFO overflow error\n");
+			if (stx_int_reg.s.ovrbst)
+				pr_err("SPI0: STX Transmit packet burst too big\n");
+			if (stx_int_reg.s.calpar1)
+				pr_err("SPI0: STX Calendar Table Parity Error Bank1\n");
+			if (stx_int_reg.s.calpar0)
+				pr_err("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 = IRQ_HANDLED;
+	}
+
+	return return_status;
+}
+
+static void cvm_oct_spi_enable_error_reporting(int interface)
+{
+	union cvmx_spxx_int_msk spxx_int_msk;
+	union cvmx_stxx_int_msk 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 net_device *dev)
+{
+	static int spi4000_port;
+	struct octeon_ethernet *priv = netdev_priv(dev);
+	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 net_device *dev)
+{
+	int r;
+	struct octeon_ethernet *priv = netdev_priv(dev);
+
+	if (number_spi_ports == 0) {
+		r = request_irq(OCTEON_IRQ_RML, cvm_oct_spi_rml_interrupt,
+				IRQF_SHARED, "SPI", &number_spi_ports);
+		if (r)
+			return r;
+	}
+	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(dev);
+	return 0;
+}
+
+void cvm_oct_spi_uninit(struct net_device *dev)
+{
+	int interface;
+
+	cvm_oct_common_uninit(dev);
+	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);
+		}
+		free_irq(OCTEON_IRQ_RML, &number_spi_ports);
+	}
+}