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/interrupt.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-util.h"
  37
  38 #include "cvmx-spi.h"
  39
  40 #include <asm/octeon/cvmx-npi-defs.h>
  41 #include "cvmx-spxx-defs.h"
  42 #include "cvmx-stxx-defs.h"
  43
  44 static int number_spi_ports;
  45 static int need_retrain[2] = { 0, 0 };
  46
  47 static irqreturn_t cvm_oct_spi_rml_interrupt(int cpl, void *dev_id)
  48 {
  49         irqreturn_t return_status = IRQ_NONE;
  50         union cvmx_npi_rsl_int_blocks rsl_int_blocks;
  51
  52         /* Check and see if this interrupt was caused by the GMX block */
  53         rsl_int_blocks.u64 = cvmx_read_csr(CVMX_NPI_RSL_INT_BLOCKS);
  54         if (rsl_int_blocks.s.spx1) {    /* 19 - SPX1_INT_REG & STX1_INT_REG */
  55
  56                 union cvmx_spxx_int_reg spx_int_reg;
  57                 union cvmx_stxx_int_reg stx_int_reg;
  58
  59                 spx_int_reg.u64 = cvmx_read_csr(CVMX_SPXX_INT_REG(1));
  60                 cvmx_write_csr(CVMX_SPXX_INT_REG(1), spx_int_reg.u64);
  61                 if (!need_retrain[1]) {
  62
  63                         spx_int_reg.u64 &= cvmx_read_csr(CVMX_SPXX_INT_MSK(1));
  64                         if (spx_int_reg.s.spf)
  65                                 pr_err("SPI1: SRX Spi4 interface down\n");
  66                         if (spx_int_reg.s.calerr)
  67                                 pr_err("SPI1: SRX Spi4 Calendar table "
  68                                        "parity error\n");
  69                         if (spx_int_reg.s.syncerr)
  70                                 pr_err("SPI1: SRX Consecutive Spi4 DIP4 "
  71                                        "errors have exceeded "
  72                                        "SPX_ERR_CTL[ERRCNT]\n");
  73                         if (spx_int_reg.s.diperr)
  74                                 pr_err("SPI1: SRX Spi4 DIP4 error\n");
  75                         if (spx_int_reg.s.tpaovr)
  76                                 pr_err("SPI1: SRX Selected port has hit "
  77                                        "TPA overflow\n");
  78                         if (spx_int_reg.s.rsverr)
  79                                 pr_err("SPI1: SRX Spi4 reserved control "
  80                                        "word detected\n");
  81                         if (spx_int_reg.s.drwnng)
  82                                 pr_err("SPI1: SRX Spi4 receive FIFO "
  83                                        "drowning/overflow\n");
  84                         if (spx_int_reg.s.clserr)
  85                                 pr_err("SPI1: SRX Spi4 packet closed on "
  86                                        "non-16B alignment without EOP\n");
  87                         if (spx_int_reg.s.spiovr)
  88                                 pr_err("SPI1: SRX Spi4 async FIFO overflow\n");
  89                         if (spx_int_reg.s.abnorm)
  90                                 pr_err("SPI1: SRX Abnormal packet "
  91                                        "termination (ERR bit)\n");
  92                         if (spx_int_reg.s.prtnxa)
  93                                 pr_err("SPI1: SRX Port out of range\n");
  94                 }
  95
  96                 stx_int_reg.u64 = cvmx_read_csr(CVMX_STXX_INT_REG(1));
  97                 cvmx_write_csr(CVMX_STXX_INT_REG(1), stx_int_reg.u64);
  98                 if (!need_retrain[1]) {
  99
 100                         stx_int_reg.u64 &= cvmx_read_csr(CVMX_STXX_INT_MSK(1));
 101                         if (stx_int_reg.s.syncerr)
 102                                 pr_err("SPI1: STX Interface encountered a "
 103                                        "fatal error\n");
 104                         if (stx_int_reg.s.frmerr)
 105                                 pr_err("SPI1: STX FRMCNT has exceeded "
 106                                        "STX_DIP_CNT[MAXFRM]\n");
 107                         if (stx_int_reg.s.unxfrm)
 108                                 pr_err("SPI1: STX Unexpected framing "
 109                                        "sequence\n");
 110                         if (stx_int_reg.s.nosync)
 111                                 pr_err("SPI1: STX ERRCNT has exceeded "
 112                                        "STX_DIP_CNT[MAXDIP]\n");
 113                         if (stx_int_reg.s.diperr)
 114                                 pr_err("SPI1: STX DIP2 error on the Spi4 "
 115                                        "Status channel\n");
 116                         if (stx_int_reg.s.datovr)
 117                                 pr_err("SPI1: STX Spi4 FIFO overflow error\n");
 118                         if (stx_int_reg.s.ovrbst)
 119                                 pr_err("SPI1: STX Transmit packet burst "
 120                                        "too big\n");
 121                         if (stx_int_reg.s.calpar1)
 122                                 pr_err("SPI1: STX Calendar Table Parity "
 123                                        "Error Bank1\n");
 124                         if (stx_int_reg.s.calpar0)
 125                                 pr_err("SPI1: STX Calendar Table Parity "
 126                                        "Error Bank0\n");
 127                 }
 128
 129                 cvmx_write_csr(CVMX_SPXX_INT_MSK(1), 0);
 130                 cvmx_write_csr(CVMX_STXX_INT_MSK(1), 0);
 131                 need_retrain[1] = 1;
 132                 return_status = IRQ_HANDLED;
 133         }
 134
 135         if (rsl_int_blocks.s.spx0) {    /* 18 - SPX0_INT_REG & STX0_INT_REG */
 136                 union cvmx_spxx_int_reg spx_int_reg;
 137                 union cvmx_stxx_int_reg stx_int_reg;
 138
 139                 spx_int_reg.u64 = cvmx_read_csr(CVMX_SPXX_INT_REG(0));
 140                 cvmx_write_csr(CVMX_SPXX_INT_REG(0), spx_int_reg.u64);
 141                 if (!need_retrain[0]) {
 142
 143                         spx_int_reg.u64 &= cvmx_read_csr(CVMX_SPXX_INT_MSK(0));
 144                         if (spx_int_reg.s.spf)
 145                                 pr_err("SPI0: SRX Spi4 interface down\n");
 146                         if (spx_int_reg.s.calerr)
 147                                 pr_err("SPI0: SRX Spi4 Calendar table "
 148                                        "parity error\n");
 149                         if (spx_int_reg.s.syncerr)
 150                                 pr_err("SPI0: SRX Consecutive Spi4 DIP4 "
 151                                        "errors have exceeded "
 152                                        "SPX_ERR_CTL[ERRCNT]\n");
 153                         if (spx_int_reg.s.diperr)
 154                                 pr_err("SPI0: SRX Spi4 DIP4 error\n");
 155                         if (spx_int_reg.s.tpaovr)
 156                                 pr_err("SPI0: SRX Selected port has hit "
 157                                        "TPA overflow\n");
 158                         if (spx_int_reg.s.rsverr)
 159                                 pr_err("SPI0: SRX Spi4 reserved control "
 160                                        "word detected\n");
 161                         if (spx_int_reg.s.drwnng)
 162                                 pr_err("SPI0: SRX Spi4 receive FIFO "
 163                                        "drowning/overflow\n");
 164                         if (spx_int_reg.s.clserr)
 165                                 pr_err("SPI0: SRX Spi4 packet closed on "
 166                                        "non-16B alignment without EOP\n");
 167                         if (spx_int_reg.s.spiovr)
 168                                 pr_err("SPI0: SRX Spi4 async FIFO overflow\n");
 169                         if (spx_int_reg.s.abnorm)
 170                                 pr_err("SPI0: SRX Abnormal packet "
 171                                        "termination (ERR bit)\n");
 172                         if (spx_int_reg.s.prtnxa)
 173                                 pr_err("SPI0: SRX Port out of range\n");
 174                 }
 175
 176                 stx_int_reg.u64 = cvmx_read_csr(CVMX_STXX_INT_REG(0));
 177                 cvmx_write_csr(CVMX_STXX_INT_REG(0), stx_int_reg.u64);
 178                 if (!need_retrain[0]) {
 179
 180                         stx_int_reg.u64 &= cvmx_read_csr(CVMX_STXX_INT_MSK(0));
 181                         if (stx_int_reg.s.syncerr)
 182                                 pr_err("SPI0: STX Interface encountered a "
 183                                        "fatal error\n");
 184                         if (stx_int_reg.s.frmerr)
 185                                 pr_err("SPI0: STX FRMCNT has exceeded "
 186                                        "STX_DIP_CNT[MAXFRM]\n");
 187                         if (stx_int_reg.s.unxfrm)
 188                                 pr_err("SPI0: STX Unexpected framing "
 189                                        "sequence\n");
 190                         if (stx_int_reg.s.nosync)
 191                                 pr_err("SPI0: STX ERRCNT has exceeded "
 192                                        "STX_DIP_CNT[MAXDIP]\n");
 193                         if (stx_int_reg.s.diperr)
 194                                 pr_err("SPI0: STX DIP2 error on the Spi4 "
 195                                        "Status channel\n");
 196                         if (stx_int_reg.s.datovr)
 197                                 pr_err("SPI0: STX Spi4 FIFO overflow error\n");
 198                         if (stx_int_reg.s.ovrbst)
 199                                 pr_err("SPI0: STX Transmit packet burst "
 200                                        "too big\n");
 201                         if (stx_int_reg.s.calpar1)
 202                                 pr_err("SPI0: STX Calendar Table Parity "
 203                                        "Error Bank1\n");
 204                         if (stx_int_reg.s.calpar0)
 205                                 pr_err("SPI0: STX Calendar Table Parity "
 206                                        "Error Bank0\n");
 207                 }
 208
 209                 cvmx_write_csr(CVMX_SPXX_INT_MSK(0), 0);
 210                 cvmx_write_csr(CVMX_STXX_INT_MSK(0), 0);
 211                 need_retrain[0] = 1;
 212                 return_status = IRQ_HANDLED;
 213         }
 214
 215         return return_status;
 216 }
 217
 218 static void cvm_oct_spi_enable_error_reporting(int interface)
 219 {
 220         union cvmx_spxx_int_msk spxx_int_msk;
 221         union cvmx_stxx_int_msk stxx_int_msk;
 222
 223         spxx_int_msk.u64 = cvmx_read_csr(CVMX_SPXX_INT_MSK(interface));
 224         spxx_int_msk.s.calerr = 1;
 225         spxx_int_msk.s.syncerr = 1;
 226         spxx_int_msk.s.diperr = 1;
 227         spxx_int_msk.s.tpaovr = 1;
 228         spxx_int_msk.s.rsverr = 1;
 229         spxx_int_msk.s.drwnng = 1;
 230         spxx_int_msk.s.clserr = 1;
 231         spxx_int_msk.s.spiovr = 1;
 232         spxx_int_msk.s.abnorm = 1;
 233         spxx_int_msk.s.prtnxa = 1;
 234         cvmx_write_csr(CVMX_SPXX_INT_MSK(interface), spxx_int_msk.u64);
 235
 236         stxx_int_msk.u64 = cvmx_read_csr(CVMX_STXX_INT_MSK(interface));
 237         stxx_int_msk.s.frmerr = 1;
 238         stxx_int_msk.s.unxfrm = 1;
 239         stxx_int_msk.s.nosync = 1;
 240         stxx_int_msk.s.diperr = 1;
 241         stxx_int_msk.s.datovr = 1;
 242         stxx_int_msk.s.ovrbst = 1;
 243         stxx_int_msk.s.calpar1 = 1;
 244         stxx_int_msk.s.calpar0 = 1;
 245         cvmx_write_csr(CVMX_STXX_INT_MSK(interface), stxx_int_msk.u64);
 246 }
 247
 248 static void cvm_oct_spi_poll(struct net_device *dev)
 249 {
 250         static int spi4000_port;
 251         struct octeon_ethernet *priv = netdev_priv(dev);
 252         int interface;
 253
 254         for (interface = 0; interface < 2; interface++) {
 255
 256                 if ((priv->port == interface * 16) && need_retrain[interface]) {
 257
 258                         if (cvmx_spi_restart_interface
 259                             (interface, CVMX_SPI_MODE_DUPLEX, 10) == 0) {
 260                                 need_retrain[interface] = 0;
 261                                 cvm_oct_spi_enable_error_reporting(interface);
 262                         }
 263                 }
 264
 265                 /*
 266                  * The SPI4000 TWSI interface is very slow. In order
 267                  * not to bring the system to a crawl, we only poll a
 268                  * single port every second. This means negotiation
 269                  * speed changes take up to 10 seconds, but at least
 270                  * we don't waste absurd amounts of time waiting for
 271                  * TWSI.
 272                  */
 273                 if (priv->port == spi4000_port) {
 274                         /*
 275                          * This function does nothing if it is called on an
 276                          * interface without a SPI4000.
 277                          */
 278                         cvmx_spi4000_check_speed(interface, priv->port);
 279                         /*
 280                          * Normal ordering increments. By decrementing
 281                          * we only match once per iteration.
 282                          */
 283                         spi4000_port--;
 284                         if (spi4000_port < 0)
 285                                 spi4000_port = 10;
 286                 }
 287         }
 288 }
 289
 290 int cvm_oct_spi_init(struct net_device *dev)
 291 {
 292         int r;
 293         struct octeon_ethernet *priv = netdev_priv(dev);
 294
 295         if (number_spi_ports == 0) {
 296                 r = request_irq(OCTEON_IRQ_RML, cvm_oct_spi_rml_interrupt,
 297                                 IRQF_SHARED, "SPI", &number_spi_ports);
 298                 if (r)
 299                         return r;
 300         }
 301         number_spi_ports++;
 302
 303         if ((priv->port == 0) || (priv->port == 16)) {
 304                 cvm_oct_spi_enable_error_reporting(INTERFACE(priv->port));
 305                 priv->poll = cvm_oct_spi_poll;
 306         }
 307         cvm_oct_common_init(dev);
 308         return 0;
 309 }
 310
 311 void cvm_oct_spi_uninit(struct net_device *dev)
 312 {
 313         int interface;
 314
 315         cvm_oct_common_uninit(dev);
 316         number_spi_ports--;
 317         if (number_spi_ports == 0) {
 318                 for (interface = 0; interface < 2; interface++) {
 319                         cvmx_write_csr(CVMX_SPXX_INT_MSK(interface), 0);
 320                         cvmx_write_csr(CVMX_STXX_INT_MSK(interface), 0);
 321                 }
 322                 free_irq(OCTEON_IRQ_RML, &number_spi_ports);
 323         }
 324 }