drivers/staging/octeon/ethernet-spi.c

   1 /**********************************************************************
   2  * Author: Cavium Networks
   3  *
   4  * Contact: support@caviumnetworks.com
   5  * This file is part of the OCTEON SDK
   6  *
   7  * Copyright (c) 2003-2007 Cavium Networks
   8  *
   9  * This file is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License, Version 2, as
  11  * published by the Free Software Foundation.
  12  *
  13  * This file is distributed in the hope that it will be useful, but
  14  * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
  15  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
  16  * NONINFRINGEMENT.  See the GNU General Public License for more
  17  * details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this file; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  22  * or visit http://www.gnu.org/licenses/.
  23  *
  24  * This file may also be available under a different license from Cavium.
  25  * Contact Cavium Networks for more information
  26 **********************************************************************/
  27 #include <linux/kernel.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/mii.h>
  30 #include <net/dst.h>
  31
  32 #include <asm/octeon/octeon.h>
  33
  34 #include "ethernet-defines.h"
  35 #include "octeon-ethernet.h"
  36 #include "ethernet-common.h"
  37 #include "ethernet-util.h"
  38
  39 #include "cvmx-spi.h"
  40
  41 #include <asm/octeon/cvmx-npi-defs.h>
  42 #include "cvmx-spxx-defs.h"
  43 #include "cvmx-stxx-defs.h"
  44
  45 static int number_spi_ports;
  46 static int need_retrain[2] = { 0, 0 };
  47
  48 static irqreturn_t cvm_oct_spi_rml_interrupt(int cpl, void *dev_id)
  49 {
  50         irqreturn_t return_status = IRQ_NONE;
  51         union cvmx_npi_rsl_int_blocks rsl_int_blocks;
  52
  53         /* Check and see if this interrupt was caused by the GMX block */
  54         rsl_int_blocks.u64 = cvmx_read_csr(CVMX_NPI_RSL_INT_BLOCKS);
  55         if (rsl_int_blocks.s.spx1) {    /* 19 - SPX1_INT_REG & STX1_INT_REG */
  56
  57                 union cvmx_spxx_int_reg spx_int_reg;
  58                 union cvmx_stxx_int_reg stx_int_reg;
  59
  60                 spx_int_reg.u64 = cvmx_read_csr(CVMX_SPXX_INT_REG(1));
  61                 cvmx_write_csr(CVMX_SPXX_INT_REG(1), spx_int_reg.u64);
  62                 if (!need_retrain[1]) {
  63
  64                         spx_int_reg.u64 &= cvmx_read_csr(CVMX_SPXX_INT_MSK(1));
  65                         if (spx_int_reg.s.spf)
  66                                 pr_err("SPI1: SRX Spi4 interface down\n");
  67                         if (spx_int_reg.s.calerr)
  68                                 pr_err("SPI1: SRX Spi4 Calendar table "
  69                                        "parity error\n");
  70                         if (spx_int_reg.s.syncerr)
  71                                 pr_err("SPI1: SRX Consecutive Spi4 DIP4 "
  72                                        "errors have exceeded "
  73                                        "SPX_ERR_CTL[ERRCNT]\n");
  74                         if (spx_int_reg.s.diperr)
  75                                 pr_err("SPI1: SRX Spi4 DIP4 error\n");
  76                         if (spx_int_reg.s.tpaovr)
  77                                 pr_err("SPI1: SRX Selected port has hit "
  78                                        "TPA overflow\n");
  79                         if (spx_int_reg.s.rsverr)
  80                                 pr_err("SPI1: SRX Spi4 reserved control "
  81                                        "word detected\n");
  82                         if (spx_int_reg.s.drwnng)
  83                                 pr_err("SPI1: SRX Spi4 receive FIFO "
  84                                        "drowning/overflow\n");
  85                         if (spx_int_reg.s.clserr)
  86                                 pr_err("SPI1: SRX Spi4 packet closed on "
  87                                        "non-16B alignment without EOP\n");
  88                         if (spx_int_reg.s.spiovr)
  89                                 pr_err("SPI1: SRX Spi4 async FIFO overflow\n");
  90                         if (spx_int_reg.s.abnorm)
  91                                 pr_err("SPI1: SRX Abnormal packet "
  92                                        "termination (ERR bit)\n");
  93                         if (spx_int_reg.s.prtnxa)
  94                                 pr_err("SPI1: SRX Port out of range\n");
  95                 }
  96
  97                 stx_int_reg.u64 = cvmx_read_csr(CVMX_STXX_INT_REG(1));
  98                 cvmx_write_csr(CVMX_STXX_INT_REG(1), stx_int_reg.u64);
  99                 if (!need_retrain[1]) {
 100
 101                         stx_int_reg.u64 &= cvmx_read_csr(CVMX_STXX_INT_MSK(1));
 102                         if (stx_int_reg.s.syncerr)
 103                                 pr_err("SPI1: STX Interface encountered a "
 104                                        "fatal error\n");
 105                         if (stx_int_reg.s.frmerr)
 106                                 pr_err("SPI1: STX FRMCNT has exceeded "
 107                                        "STX_DIP_CNT[MAXFRM]\n");
 108                         if (stx_int_reg.s.unxfrm)
 109                                 pr_err("SPI1: STX Unexpected framing "
 110                                        "sequence\n");
 111                         if (stx_int_reg.s.nosync)
 112                                 pr_err("SPI1: STX ERRCNT has exceeded "
 113                                        "STX_DIP_CNT[MAXDIP]\n");
 114                         if (stx_int_reg.s.diperr)
 115                                 pr_err("SPI1: STX DIP2 error on the Spi4 "
 116                                        "Status channel\n");
 117                         if (stx_int_reg.s.datovr)
 118                                 pr_err("SPI1: STX Spi4 FIFO overflow error\n");
 119                         if (stx_int_reg.s.ovrbst)
 120                                 pr_err("SPI1: STX Transmit packet burst "
 121                                        "too big\n");
 122                         if (stx_int_reg.s.calpar1)
 123                                 pr_err("SPI1: STX Calendar Table Parity "
 124                                        "Error Bank1\n");
 125                         if (stx_int_reg.s.calpar0)
 126                                 pr_err("SPI1: STX Calendar Table Parity "
 127                                        "Error Bank0\n");
 128                 }
 129
 130                 cvmx_write_csr(CVMX_SPXX_INT_MSK(1), 0);
 131                 cvmx_write_csr(CVMX_STXX_INT_MSK(1), 0);
 132                 need_retrain[1] = 1;
 133                 return_status = IRQ_HANDLED;
 134         }
 135
 136         if (rsl_int_blocks.s.spx0) {    /* 18 - SPX0_INT_REG & STX0_INT_REG */
 137                 union cvmx_spxx_int_reg spx_int_reg;
 138                 union cvmx_stxx_int_reg stx_int_reg;
 139
 140                 spx_int_reg.u64 = cvmx_read_csr(CVMX_SPXX_INT_REG(0));
 141                 cvmx_write_csr(CVMX_SPXX_INT_REG(0), spx_int_reg.u64);
 142                 if (!need_retrain[0]) {
 143
 144                         spx_int_reg.u64 &= cvmx_read_csr(CVMX_SPXX_INT_MSK(0));
 145                         if (spx_int_reg.s.spf)
 146                                 pr_err("SPI0: SRX Spi4 interface down\n");
 147                         if (spx_int_reg.s.calerr)
 148                                 pr_err("SPI0: SRX Spi4 Calendar table "
 149                                        "parity error\n");
 150                         if (spx_int_reg.s.syncerr)
 151                                 pr_err("SPI0: SRX Consecutive Spi4 DIP4 "
 152                                        "errors have exceeded "
 153                                        "SPX_ERR_CTL[ERRCNT]\n");
 154                         if (spx_int_reg.s.diperr)
 155                                 pr_err("SPI0: SRX Spi4 DIP4 error\n");
 156                         if (spx_int_reg.s.tpaovr)
 157                                 pr_err("SPI0: SRX Selected port has hit "
 158                                        "TPA overflow\n");
 159                         if (spx_int_reg.s.rsverr)
 160                                 pr_err("SPI0: SRX Spi4 reserved control "
 161                                        "word detected\n");
 162                         if (spx_int_reg.s.drwnng)
 163                                 pr_err("SPI0: SRX Spi4 receive FIFO "
 164                                        "drowning/overflow\n");
 165                         if (spx_int_reg.s.clserr)
 166                                 pr_err("SPI0: SRX Spi4 packet closed on "
 167                                        "non-16B alignment without EOP\n");
 168                         if (spx_int_reg.s.spiovr)
 169                                 pr_err("SPI0: SRX Spi4 async FIFO overflow\n");
 170                         if (spx_int_reg.s.abnorm)
 171                                 pr_err("SPI0: SRX Abnormal packet "
 172                                        "termination (ERR bit)\n");
 173                         if (spx_int_reg.s.prtnxa)
 174                                 pr_err("SPI0: SRX Port out of range\n");
 175                 }
 176
 177                 stx_int_reg.u64 = cvmx_read_csr(CVMX_STXX_INT_REG(0));
 178                 cvmx_write_csr(CVMX_STXX_INT_REG(0), stx_int_reg.u64);
 179                 if (!need_retrain[0]) {
 180
 181                         stx_int_reg.u64 &= cvmx_read_csr(CVMX_STXX_INT_MSK(0));
 182                         if (stx_int_reg.s.syncerr)
 183                                 pr_err("SPI0: STX Interface encountered a "
 184                                        "fatal error\n");
 185                         if (stx_int_reg.s.frmerr)
 186                                 pr_err("SPI0: STX FRMCNT has exceeded "
 187                                        "STX_DIP_CNT[MAXFRM]\n");
 188                         if (stx_int_reg.s.unxfrm)
 189                                 pr_err("SPI0: STX Unexpected framing "
 190                                        "sequence\n");
 191                         if (stx_int_reg.s.nosync)
 192                                 pr_err("SPI0: STX ERRCNT has exceeded "
 193                                        "STX_DIP_CNT[MAXDIP]\n");
 194                         if (stx_int_reg.s.diperr)
 195                                 pr_err("SPI0: STX DIP2 error on the Spi4 "
 196                                        "Status channel\n");
 197                         if (stx_int_reg.s.datovr)
 198                                 pr_err("SPI0: STX Spi4 FIFO overflow error\n");
 199                         if (stx_int_reg.s.ovrbst)
 200                                 pr_err("SPI0: STX Transmit packet burst "
 201                                        "too big\n");
 202                         if (stx_int_reg.s.calpar1)
 203                                 pr_err("SPI0: STX Calendar Table Parity "
 204                                        "Error Bank1\n");
 205                         if (stx_int_reg.s.calpar0)
 206                                 pr_err("SPI0: STX Calendar Table Parity "
 207                                        "Error Bank0\n");
 208                 }
 209
 210                 cvmx_write_csr(CVMX_SPXX_INT_MSK(0), 0);
 211                 cvmx_write_csr(CVMX_STXX_INT_MSK(0), 0);
 212                 need_retrain[0] = 1;
 213                 return_status = IRQ_HANDLED;
 214         }
 215
 216         return return_status;
 217 }
 218
 219 static void cvm_oct_spi_enable_error_reporting(int interface)
 220 {
 221         union cvmx_spxx_int_msk spxx_int_msk;
 222         union cvmx_stxx_int_msk stxx_int_msk;
 223
 224         spxx_int_msk.u64 = cvmx_read_csr(CVMX_SPXX_INT_MSK(interface));
 225         spxx_int_msk.s.calerr = 1;
 226         spxx_int_msk.s.syncerr = 1;
 227         spxx_int_msk.s.diperr = 1;
 228         spxx_int_msk.s.tpaovr = 1;
 229         spxx_int_msk.s.rsverr = 1;
 230         spxx_int_msk.s.drwnng = 1;
 231         spxx_int_msk.s.clserr = 1;
 232         spxx_int_msk.s.spiovr = 1;
 233         spxx_int_msk.s.abnorm = 1;
 234         spxx_int_msk.s.prtnxa = 1;
 235         cvmx_write_csr(CVMX_SPXX_INT_MSK(interface), spxx_int_msk.u64);
 236
 237         stxx_int_msk.u64 = cvmx_read_csr(CVMX_STXX_INT_MSK(interface));
 238         stxx_int_msk.s.frmerr = 1;
 239         stxx_int_msk.s.unxfrm = 1;
 240         stxx_int_msk.s.nosync = 1;
 241         stxx_int_msk.s.diperr = 1;
 242         stxx_int_msk.s.datovr = 1;
 243         stxx_int_msk.s.ovrbst = 1;
 244         stxx_int_msk.s.calpar1 = 1;
 245         stxx_int_msk.s.calpar0 = 1;
 246         cvmx_write_csr(CVMX_STXX_INT_MSK(interface), stxx_int_msk.u64);
 247 }
 248
 249 static void cvm_oct_spi_poll(struct net_device *dev)
 250 {
 251         static int spi4000_port;
 252         struct octeon_ethernet *priv = netdev_priv(dev);
 253         int interface;
 254
 255         for (interface = 0; interface < 2; interface++) {
 256
 257                 if ((priv->port == interface * 16) && need_retrain[interface]) {
 258
 259                         if (cvmx_spi_restart_interface
 260                             (interface, CVMX_SPI_MODE_DUPLEX, 10) == 0) {
 261                                 need_retrain[interface] = 0;
 262                                 cvm_oct_spi_enable_error_reporting(interface);
 263                         }
 264                 }
 265
 266                 /*
 267                  * The SPI4000 TWSI interface is very slow. In order
 268                  * not to bring the system to a crawl, we only poll a
 269                  * single port every second. This means negotiation
 270                  * speed changes take up to 10 seconds, but at least
 271                  * we don't waste absurd amounts of time waiting for
 272                  * TWSI.
 273                  */
 274                 if (priv->port == spi4000_port) {
 275                         /*
 276                          * This function does nothing if it is called on an
 277                          * interface without a SPI4000.
 278                          */
 279                         cvmx_spi4000_check_speed(interface, priv->port);
 280                         /*
 281                          * Normal ordering increments. By decrementing
 282                          * we only match once per iteration.
 283                          */
 284                         spi4000_port--;
 285                         if (spi4000_port < 0)
 286                                 spi4000_port = 10;
 287                 }
 288         }
 289 }
 290
 291 int cvm_oct_spi_init(struct net_device *dev)
 292 {
 293         int r;
 294         struct octeon_ethernet *priv = netdev_priv(dev);
 295
 296         if (number_spi_ports == 0) {
 297                 r = request_irq(OCTEON_IRQ_RML, cvm_oct_spi_rml_interrupt,
 298                                 IRQF_SHARED, "SPI", &number_spi_ports);
 299         }
 300         number_spi_ports++;
 301
 302         if ((priv->port == 0) || (priv->port == 16)) {
 303                 cvm_oct_spi_enable_error_reporting(INTERFACE(priv->port));
 304                 priv->poll = cvm_oct_spi_poll;
 305         }
 306         cvm_oct_common_init(dev);
 307         return 0;
 308 }
 309
 310 void cvm_oct_spi_uninit(struct net_device *dev)
 311 {
 312         int interface;
 313
 314         cvm_oct_common_uninit(dev);
 315         number_spi_ports--;
 316         if (number_spi_ports == 0) {
 317                 for (interface = 0; interface < 2; interface++) {
 318                         cvmx_write_csr(CVMX_SPXX_INT_MSK(interface), 0);
 319                         cvmx_write_csr(CVMX_STXX_INT_MSK(interface), 0);
 320                 }
 321                 free_irq(8 + 46, &number_spi_ports);
 322         }
 323 }