release/src-rt-6.x.4708/linux/linux-2.6.36/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 <net/dst.h>
  30
  31 #include <asm/octeon/octeon.h>
  32
  33 #include "ethernet-defines.h"
  34 #include "octeon-ethernet.h"
  35 #include "ethernet-util.h"
  36
  37 #include "cvmx-spi.h"
  38
  39 #include <asm/octeon/cvmx-npi-defs.h>
  40 #include "cvmx-spxx-defs.h"
  41 #include "cvmx-stxx-defs.h"
  42
  43 static int number_spi_ports;
  44 static int need_retrain[2] = { 0, 0 };
  45
  46 static irqreturn_t cvm_oct_spi_rml_interrupt(int cpl, void *dev_id)
  47 {
  48         irqreturn_t return_status = IRQ_NONE;
  49         union cvmx_npi_rsl_int_blocks rsl_int_blocks;
  50
  51         /* Check and see if this interrupt was caused by the GMX block */
  52         rsl_int_blocks.u64 = cvmx_read_csr(CVMX_NPI_RSL_INT_BLOCKS);
  53         if (rsl_int_blocks.s.spx1) {    /* 19 - SPX1_INT_REG & STX1_INT_REG */
  54
  55                 union cvmx_spxx_int_reg spx_int_reg;
  56                 union cvmx_stxx_int_reg stx_int_reg;
  57
  58                 spx_int_reg.u64 = cvmx_read_csr(CVMX_SPXX_INT_REG(1));
  59                 cvmx_write_csr(CVMX_SPXX_INT_REG(1), spx_int_reg.u64);
  60                 if (!need_retrain[1]) {
  61
  62                         spx_int_reg.u64 &= cvmx_read_csr(CVMX_SPXX_INT_MSK(1));
  63                         if (spx_int_reg.s.spf)
  64                                 pr_err("SPI1: SRX Spi4 interface down\n");
  65                         if (spx_int_reg.s.calerr)
  66                                 pr_err("SPI1: SRX Spi4 Calendar table "
  67                                        "parity error\n");
  68                         if (spx_int_reg.s.syncerr)
  69                                 pr_err("SPI1: SRX Consecutive Spi4 DIP4 "
  70                                        "errors have exceeded "
  71                                        "SPX_ERR_CTL[ERRCNT]\n");
  72                         if (spx_int_reg.s.diperr)
  73                                 pr_err("SPI1: SRX Spi4 DIP4 error\n");
  74                         if (spx_int_reg.s.tpaovr)
  75                                 pr_err("SPI1: SRX Selected port has hit "
  76                                        "TPA overflow\n");
  77                         if (spx_int_reg.s.rsverr)
  78                                 pr_err("SPI1: SRX Spi4 reserved control "
  79                                        "word detected\n");
  80                         if (spx_int_reg.s.drwnng)
  81                                 pr_err("SPI1: SRX Spi4 receive FIFO "
  82                                        "drowning/overflow\n");
  83                         if (spx_int_reg.s.clserr)
  84                                 pr_err("SPI1: SRX Spi4 packet closed on "
  85                                        "non-16B alignment without EOP\n");
  86                         if (spx_int_reg.s.spiovr)
  87                                 pr_err("SPI1: SRX Spi4 async FIFO overflow\n");
  88                         if (spx_int_reg.s.abnorm)
  89                                 pr_err("SPI1: SRX Abnormal packet "
  90                                        "termination (ERR bit)\n");
  91                         if (spx_int_reg.s.prtnxa)
  92                                 pr_err("SPI1: SRX Port out of range\n");
  93                 }
  94
  95                 stx_int_reg.u64 = cvmx_read_csr(CVMX_STXX_INT_REG(1));
  96                 cvmx_write_csr(CVMX_STXX_INT_REG(1), stx_int_reg.u64);
  97                 if (!need_retrain[1]) {
  98
  99                         stx_int_reg.u64 &= cvmx_read_csr(CVMX_STXX_INT_MSK(1));
 100                         if (stx_int_reg.s.syncerr)
 101                                 pr_err("SPI1: STX Interface encountered a "
 102                                        "fatal error\n");
 103                         if (stx_int_reg.s.frmerr)
 104                                 pr_err("SPI1: STX FRMCNT has exceeded "
 105                                        "STX_DIP_CNT[MAXFRM]\n");
 106                         if (stx_int_reg.s.unxfrm)
 107                                 pr_err("SPI1: STX Unexpected framing "
 108                                        "sequence\n");
 109                         if (stx_int_reg.s.nosync)
 110                                 pr_err("SPI1: STX ERRCNT has exceeded "
 111                                        "STX_DIP_CNT[MAXDIP]\n");
 112                         if (stx_int_reg.s.diperr)
 113                                 pr_err("SPI1: STX DIP2 error on the Spi4 "
 114                                        "Status channel\n");
 115                         if (stx_int_reg.s.datovr)
 116                                 pr_err("SPI1: STX Spi4 FIFO overflow error\n");
 117                         if (stx_int_reg.s.ovrbst)
 118                                 pr_err("SPI1: STX Transmit packet burst "
 119                                        "too big\n");
 120                         if (stx_int_reg.s.calpar1)
 121                                 pr_err("SPI1: STX Calendar Table Parity "
 122                                        "Error Bank1\n");
 123                         if (stx_int_reg.s.calpar0)
 124                                 pr_err("SPI1: STX Calendar Table Parity "
 125                                        "Error Bank0\n");
 126                 }
 127
 128                 cvmx_write_csr(CVMX_SPXX_INT_MSK(1), 0);
 129                 cvmx_write_csr(CVMX_STXX_INT_MSK(1), 0);
 130                 need_retrain[1] = 1;
 131                 return_status = IRQ_HANDLED;
 132         }
 133
 134         if (rsl_int_blocks.s.spx0) {    /* 18 - SPX0_INT_REG & STX0_INT_REG */
 135                 union cvmx_spxx_int_reg spx_int_reg;
 136                 union cvmx_stxx_int_reg stx_int_reg;
 137
 138                 spx_int_reg.u64 = cvmx_read_csr(CVMX_SPXX_INT_REG(0));
 139                 cvmx_write_csr(CVMX_SPXX_INT_REG(0), spx_int_reg.u64);
 140                 if (!need_retrain[0]) {
 141
 142                         spx_int_reg.u64 &= cvmx_read_csr(CVMX_SPXX_INT_MSK(0));
 143                         if (spx_int_reg.s.spf)
 144                                 pr_err("SPI0: SRX Spi4 interface down\n");
 145                         if (spx_int_reg.s.calerr)
 146                                 pr_err("SPI0: SRX Spi4 Calendar table "
 147                                        "parity error\n");
 148                         if (spx_int_reg.s.syncerr)
 149                                 pr_err("SPI0: SRX Consecutive Spi4 DIP4 "
 150                                        "errors have exceeded "
 151                                        "SPX_ERR_CTL[ERRCNT]\n");
 152                         if (spx_int_reg.s.diperr)
 153                                 pr_err("SPI0: SRX Spi4 DIP4 error\n");
 154                         if (spx_int_reg.s.tpaovr)
 155                                 pr_err("SPI0: SRX Selected port has hit "
 156                                        "TPA overflow\n");
 157                         if (spx_int_reg.s.rsverr)
 158                                 pr_err("SPI0: SRX Spi4 reserved control "
 159                                        "word detected\n");
 160                         if (spx_int_reg.s.drwnng)
 161                                 pr_err("SPI0: SRX Spi4 receive FIFO "
 162                                        "drowning/overflow\n");
 163                         if (spx_int_reg.s.clserr)
 164                                 pr_err("SPI0: SRX Spi4 packet closed on "
 165                                        "non-16B alignment without EOP\n");
 166                         if (spx_int_reg.s.spiovr)
 167                                 pr_err("SPI0: SRX Spi4 async FIFO overflow\n");
 168                         if (spx_int_reg.s.abnorm)
 169                                 pr_err("SPI0: SRX Abnormal packet "
 170                                        "termination (ERR bit)\n");
 171                         if (spx_int_reg.s.prtnxa)
 172                                 pr_err("SPI0: SRX Port out of range\n");
 173                 }
 174
 175                 stx_int_reg.u64 = cvmx_read_csr(CVMX_STXX_INT_REG(0));
 176                 cvmx_write_csr(CVMX_STXX_INT_REG(0), stx_int_reg.u64);
 177                 if (!need_retrain[0]) {
 178
 179                         stx_int_reg.u64 &= cvmx_read_csr(CVMX_STXX_INT_MSK(0));
 180                         if (stx_int_reg.s.syncerr)
 181                                 pr_err("SPI0: STX Interface encountered a "
 182                                        "fatal error\n");
 183                         if (stx_int_reg.s.frmerr)
 184                                 pr_err("SPI0: STX FRMCNT has exceeded "
 185                                        "STX_DIP_CNT[MAXFRM]\n");
 186                         if (stx_int_reg.s.unxfrm)
 187                                 pr_err("SPI0: STX Unexpected framing "
 188                                        "sequence\n");
 189                         if (stx_int_reg.s.nosync)
 190                                 pr_err("SPI0: STX ERRCNT has exceeded "
 191                                        "STX_DIP_CNT[MAXDIP]\n");
 192                         if (stx_int_reg.s.diperr)
 193                                 pr_err("SPI0: STX DIP2 error on the Spi4 "
 194                                        "Status channel\n");
 195                         if (stx_int_reg.s.datovr)
 196                                 pr_err("SPI0: STX Spi4 FIFO overflow error\n");
 197                         if (stx_int_reg.s.ovrbst)
 198                                 pr_err("SPI0: STX Transmit packet burst "
 199                                        "too big\n");
 200                         if (stx_int_reg.s.calpar1)
 201                                 pr_err("SPI0: STX Calendar Table Parity "
 202                                        "Error Bank1\n");
 203                         if (stx_int_reg.s.calpar0)
 204                                 pr_err("SPI0: STX Calendar Table Parity "
 205                                        "Error Bank0\n");
 206                 }
 207
 208                 cvmx_write_csr(CVMX_SPXX_INT_MSK(0), 0);
 209                 cvmx_write_csr(CVMX_STXX_INT_MSK(0), 0);
 210                 need_retrain[0] = 1;
 211                 return_status = IRQ_HANDLED;
 212         }
 213
 214         return return_status;
 215 }
 216
 217 static void cvm_oct_spi_enable_error_reporting(int interface)
 218 {
 219         union cvmx_spxx_int_msk spxx_int_msk;
 220         union cvmx_stxx_int_msk stxx_int_msk;
 221
 222         spxx_int_msk.u64 = cvmx_read_csr(CVMX_SPXX_INT_MSK(interface));
 223         spxx_int_msk.s.calerr = 1;
 224         spxx_int_msk.s.syncerr = 1;
 225         spxx_int_msk.s.diperr = 1;
 226         spxx_int_msk.s.tpaovr = 1;
 227         spxx_int_msk.s.rsverr = 1;
 228         spxx_int_msk.s.drwnng = 1;
 229         spxx_int_msk.s.clserr = 1;
 230         spxx_int_msk.s.spiovr = 1;
 231         spxx_int_msk.s.abnorm = 1;
 232         spxx_int_msk.s.prtnxa = 1;
 233         cvmx_write_csr(CVMX_SPXX_INT_MSK(interface), spxx_int_msk.u64);
 234
 235         stxx_int_msk.u64 = cvmx_read_csr(CVMX_STXX_INT_MSK(interface));
 236         stxx_int_msk.s.frmerr = 1;
 237         stxx_int_msk.s.unxfrm = 1;
 238         stxx_int_msk.s.nosync = 1;
 239         stxx_int_msk.s.diperr = 1;
 240         stxx_int_msk.s.datovr = 1;
 241         stxx_int_msk.s.ovrbst = 1;
 242         stxx_int_msk.s.calpar1 = 1;
 243         stxx_int_msk.s.calpar0 = 1;
 244         cvmx_write_csr(CVMX_STXX_INT_MSK(interface), stxx_int_msk.u64);
 245 }
 246
 247 static void cvm_oct_spi_poll(struct net_device *dev)
 248 {
 249         static int spi4000_port;
 250         struct octeon_ethernet *priv = netdev_priv(dev);
 251         int interface;
 252
 253         for (interface = 0; interface < 2; interface++) {
 254
 255                 if ((priv->port == interface * 16) && need_retrain[interface]) {
 256
 257                         if (cvmx_spi_restart_interface
 258                             (interface, CVMX_SPI_MODE_DUPLEX, 10) == 0) {
 259                                 need_retrain[interface] = 0;
 260                                 cvm_oct_spi_enable_error_reporting(interface);
 261                         }
 262                 }
 263
 264                 /*
 265                  * The SPI4000 TWSI interface is very slow. In order
 266                  * not to bring the system to a crawl, we only poll a
 267                  * single port every second. This means negotiation
 268                  * speed changes take up to 10 seconds, but at least
 269                  * we don't waste absurd amounts of time waiting for
 270                  * TWSI.
 271                  */
 272                 if (priv->port == spi4000_port) {
 273                         /*
 274                          * This function does nothing if it is called on an
 275                          * interface without a SPI4000.
 276                          */
 277                         cvmx_spi4000_check_speed(interface, priv->port);
 278                         /*
 279                          * Normal ordering increments. By decrementing
 280                          * we only match once per iteration.
 281                          */
 282                         spi4000_port--;
 283                         if (spi4000_port < 0)
 284                                 spi4000_port = 10;
 285                 }
 286         }
 287 }
 288
 289 int cvm_oct_spi_init(struct net_device *dev)
 290 {
 291         int r;
 292         struct octeon_ethernet *priv = netdev_priv(dev);
 293
 294         if (number_spi_ports == 0) {
 295                 r = request_irq(OCTEON_IRQ_RML, cvm_oct_spi_rml_interrupt,
 296                                 IRQF_SHARED, "SPI", &number_spi_ports);
 297                 if (r)
 298                         return r;
 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(OCTEON_IRQ_RML, &number_spi_ports);
 322         }
 323 }