drivers/rapidio/switches/tsi57x.c

   1 /*
   2  * RapidIO Tsi57x switch family support
   3  *
   4  * Copyright 2009-2010 Integrated Device Technology, Inc.
   5  * Alexandre Bounine <alexandre.bounine@idt.com>
   6  *  - Added EM support
   7  *  - Modified switch operations initialization.
   8  *
   9  * Copyright 2005 MontaVista Software, Inc.
  10  * Matt Porter <mporter@kernel.crashing.org>
  11  *
  12  * This program is free software; you can redistribute  it and/or modify it
  13  * under  the terms of  the GNU General  Public License as published by the
  14  * Free Software Foundation;  either version 2 of the  License, or (at your
  15  * option) any later version.
  16  */
  17
  18 #include <linux/rio.h>
  19 #include <linux/rio_drv.h>
  20 #include <linux/rio_ids.h>
  21 #include <linux/delay.h>
  22 #include <linux/module.h>
  23 #include "../rio.h"
  24
  25 /* Global (broadcast) route registers */
  26 #define SPBC_ROUTE_CFG_DESTID   0x10070
  27 #define SPBC_ROUTE_CFG_PORT     0x10074
  28
  29 /* Per port route registers */
  30 #define SPP_ROUTE_CFG_DESTID(n) (0x11070 + 0x100*n)
  31 #define SPP_ROUTE_CFG_PORT(n)   (0x11074 + 0x100*n)
  32
  33 #define TSI578_SP_MODE(n)       (0x11004 + n*0x100)
  34 #define TSI578_SP_MODE_GLBL     0x10004
  35 #define  TSI578_SP_MODE_PW_DIS  0x08000000
  36 #define  TSI578_SP_MODE_LUT_512 0x01000000
  37
  38 #define TSI578_SP_CTL_INDEP(n)  (0x13004 + n*0x100)
  39 #define TSI578_SP_LUT_PEINF(n)  (0x13010 + n*0x100)
  40 #define TSI578_SP_CS_TX(n)      (0x13014 + n*0x100)
  41 #define TSI578_SP_INT_STATUS(n) (0x13018 + n*0x100)
  42
  43 #define TSI578_GLBL_ROUTE_BASE  0x10078
  44
  45 static int
  46 tsi57x_route_add_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
  47                        u16 table, u16 route_destid, u8 route_port)
  48 {
  49         if (table == RIO_GLOBAL_TABLE) {
  50                 rio_mport_write_config_32(mport, destid, hopcount,
  51                                           SPBC_ROUTE_CFG_DESTID, route_destid);
  52                 rio_mport_write_config_32(mport, destid, hopcount,
  53                                           SPBC_ROUTE_CFG_PORT, route_port);
  54         } else {
  55                 rio_mport_write_config_32(mport, destid, hopcount,
  56                                 SPP_ROUTE_CFG_DESTID(table), route_destid);
  57                 rio_mport_write_config_32(mport, destid, hopcount,
  58                                 SPP_ROUTE_CFG_PORT(table), route_port);
  59         }
  60
  61         udelay(10);
  62
  63         return 0;
  64 }
  65
  66 static int
  67 tsi57x_route_get_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
  68                        u16 table, u16 route_destid, u8 *route_port)
  69 {
  70         int ret = 0;
  71         u32 result;
  72
  73         if (table == RIO_GLOBAL_TABLE) {
  74                 /* Use local RT of the ingress port to avoid possible
  75                    race condition */
  76                 rio_mport_read_config_32(mport, destid, hopcount,
  77                         RIO_SWP_INFO_CAR, &result);
  78                 table = (result & RIO_SWP_INFO_PORT_NUM_MASK);
  79         }
  80
  81         rio_mport_write_config_32(mport, destid, hopcount,
  82                                 SPP_ROUTE_CFG_DESTID(table), route_destid);
  83         rio_mport_read_config_32(mport, destid, hopcount,
  84                                 SPP_ROUTE_CFG_PORT(table), &result);
  85
  86         *route_port = (u8)result;
  87         if (*route_port > 15)
  88                 ret = -1;
  89
  90         return ret;
  91 }
  92
  93 static int
  94 tsi57x_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount,
  95                        u16 table)
  96 {
  97         u32 route_idx;
  98         u32 lut_size;
  99
 100         lut_size = (mport->sys_size) ? 0x1ff : 0xff;
 101
 102         if (table == RIO_GLOBAL_TABLE) {
 103                 rio_mport_write_config_32(mport, destid, hopcount,
 104                                           SPBC_ROUTE_CFG_DESTID, 0x80000000);
 105                 for (route_idx = 0; route_idx <= lut_size; route_idx++)
 106                         rio_mport_write_config_32(mport, destid, hopcount,
 107                                                   SPBC_ROUTE_CFG_PORT,
 108                                                   RIO_INVALID_ROUTE);
 109         } else {
 110                 rio_mport_write_config_32(mport, destid, hopcount,
 111                                 SPP_ROUTE_CFG_DESTID(table), 0x80000000);
 112                 for (route_idx = 0; route_idx <= lut_size; route_idx++)
 113                         rio_mport_write_config_32(mport, destid, hopcount,
 114                                 SPP_ROUTE_CFG_PORT(table) , RIO_INVALID_ROUTE);
 115         }
 116
 117         return 0;
 118 }
 119
 120 static int
 121 tsi57x_set_domain(struct rio_mport *mport, u16 destid, u8 hopcount,
 122                        u8 sw_domain)
 123 {
 124         u32 regval;
 125
 126         /*
 127          * Switch domain configuration operates only at global level
 128          */
 129
 130         /* Turn off flat (LUT_512) mode */
 131         rio_mport_read_config_32(mport, destid, hopcount,
 132                                  TSI578_SP_MODE_GLBL, &regval);
 133         rio_mport_write_config_32(mport, destid, hopcount, TSI578_SP_MODE_GLBL,
 134                                   regval & ~TSI578_SP_MODE_LUT_512);
 135         /* Set switch domain base */
 136         rio_mport_write_config_32(mport, destid, hopcount,
 137                                   TSI578_GLBL_ROUTE_BASE,
 138                                   (u32)(sw_domain << 24));
 139         return 0;
 140 }
 141
 142 static int
 143 tsi57x_get_domain(struct rio_mport *mport, u16 destid, u8 hopcount,
 144                        u8 *sw_domain)
 145 {
 146         u32 regval;
 147
 148         /*
 149          * Switch domain configuration operates only at global level
 150          */
 151         rio_mport_read_config_32(mport, destid, hopcount,
 152                                 TSI578_GLBL_ROUTE_BASE, &regval);
 153
 154         *sw_domain = (u8)(regval >> 24);
 155
 156         return 0;
 157 }
 158
 159 static int
 160 tsi57x_em_init(struct rio_dev *rdev)
 161 {
 162         u32 regval;
 163         int portnum;
 164
 165         pr_debug("TSI578 %s [%d:%d]\n", __func__, rdev->destid, rdev->hopcount);
 166
 167         for (portnum = 0;
 168              portnum < RIO_GET_TOTAL_PORTS(rdev->swpinfo); portnum++) {
 169                 /* Make sure that Port-Writes are enabled (for all ports) */
 170                 rio_read_config_32(rdev,
 171                                 TSI578_SP_MODE(portnum), &regval);
 172                 rio_write_config_32(rdev,
 173                                 TSI578_SP_MODE(portnum),
 174                                 regval & ~TSI578_SP_MODE_PW_DIS);
 175
 176                 /* Clear all pending interrupts */
 177                 rio_read_config_32(rdev,
 178                                 RIO_DEV_PORT_N_ERR_STS_CSR(rdev, portnum),
 179                                 &regval);
 180                 rio_write_config_32(rdev,
 181                                 RIO_DEV_PORT_N_ERR_STS_CSR(rdev, portnum),
 182                                 regval & 0x07120214);
 183
 184                 rio_read_config_32(rdev,
 185                                 TSI578_SP_INT_STATUS(portnum), &regval);
 186                 rio_write_config_32(rdev,
 187                                 TSI578_SP_INT_STATUS(portnum),
 188                                 regval & 0x000700bd);
 189
 190                 /* Enable all interrupts to allow ports to send a port-write */
 191                 rio_read_config_32(rdev,
 192                                 TSI578_SP_CTL_INDEP(portnum), &regval);
 193                 rio_write_config_32(rdev,
 194                                 TSI578_SP_CTL_INDEP(portnum),
 195                                 regval | 0x000b0000);
 196
 197                 /* Skip next (odd) port if the current port is in x4 mode */
 198                 rio_read_config_32(rdev,
 199                                 RIO_DEV_PORT_N_CTL_CSR(rdev, portnum),
 200                                 &regval);
 201                 if ((regval & RIO_PORT_N_CTL_PWIDTH) == RIO_PORT_N_CTL_PWIDTH_4)
 202                         portnum++;
 203         }
 204
 205         /* set TVAL = ~50us */
 206         rio_write_config_32(rdev,
 207                 rdev->phys_efptr + RIO_PORT_LINKTO_CTL_CSR, 0x9a << 8);
 208
 209         return 0;
 210 }
 211
 212 static int
 213 tsi57x_em_handler(struct rio_dev *rdev, u8 portnum)
 214 {
 215         struct rio_mport *mport = rdev->net->hport;
 216         u32 intstat, err_status;
 217         int sendcount, checkcount;
 218         u8 route_port;
 219         u32 regval;
 220
 221         rio_read_config_32(rdev,
 222                         RIO_DEV_PORT_N_ERR_STS_CSR(rdev, portnum),
 223                         &err_status);
 224
 225         if ((err_status & RIO_PORT_N_ERR_STS_PORT_OK) &&
 226             (err_status & (RIO_PORT_N_ERR_STS_OUT_ES |
 227                           RIO_PORT_N_ERR_STS_INP_ES))) {
 228                 /* Remove any queued packets by locking/unlocking port */
 229                 rio_read_config_32(rdev,
 230                         RIO_DEV_PORT_N_CTL_CSR(rdev, portnum),
 231                         &regval);
 232                 if (!(regval & RIO_PORT_N_CTL_LOCKOUT)) {
 233                         rio_write_config_32(rdev,
 234                                 RIO_DEV_PORT_N_CTL_CSR(rdev, portnum),
 235                                 regval | RIO_PORT_N_CTL_LOCKOUT);
 236                         udelay(50);
 237                         rio_write_config_32(rdev,
 238                                 RIO_DEV_PORT_N_CTL_CSR(rdev, portnum),
 239                                 regval);
 240                 }
 241
 242                 /* Read from link maintenance response register to clear
 243                  * valid bit
 244                  */
 245                 rio_read_config_32(rdev,
 246                         RIO_DEV_PORT_N_MNT_RSP_CSR(rdev, portnum),
 247                         &regval);
 248
 249                 /* Send a Packet-Not-Accepted/Link-Request-Input-Status control
 250                  * symbol to recover from IES/OES
 251                  */
 252                 sendcount = 3;
 253                 while (sendcount) {
 254                         rio_write_config_32(rdev,
 255                                           TSI578_SP_CS_TX(portnum), 0x40fc8000);
 256                         checkcount = 3;
 257                         while (checkcount--) {
 258                                 udelay(50);
 259                                 rio_read_config_32(rdev,
 260                                         RIO_DEV_PORT_N_MNT_RSP_CSR(rdev,
 261                                                                    portnum),
 262                                         &regval);
 263                                 if (regval & RIO_PORT_N_MNT_RSP_RVAL)
 264                                         goto exit_es;
 265                         }
 266
 267                         sendcount--;
 268                 }
 269         }
 270
 271 exit_es:
 272         /* Clear implementation specific error status bits */
 273         rio_read_config_32(rdev, TSI578_SP_INT_STATUS(portnum), &intstat);
 274         pr_debug("TSI578[%x:%x] SP%d_INT_STATUS=0x%08x\n",
 275                  rdev->destid, rdev->hopcount, portnum, intstat);
 276
 277         if (intstat & 0x10000) {
 278                 rio_read_config_32(rdev,
 279                                 TSI578_SP_LUT_PEINF(portnum), &regval);
 280                 regval = (mport->sys_size) ? (regval >> 16) : (regval >> 24);
 281                 route_port = rdev->rswitch->route_table[regval];
 282                 pr_debug("RIO: TSI578[%s] P%d LUT Parity Error (destID=%d)\n",
 283                         rio_name(rdev), portnum, regval);
 284                 tsi57x_route_add_entry(mport, rdev->destid, rdev->hopcount,
 285                                 RIO_GLOBAL_TABLE, regval, route_port);
 286         }
 287
 288         rio_write_config_32(rdev, TSI578_SP_INT_STATUS(portnum),
 289                             intstat & 0x000700bd);
 290
 291         return 0;
 292 }
 293
 294 static struct rio_switch_ops tsi57x_switch_ops = {
 295         .owner = THIS_MODULE,
 296         .add_entry = tsi57x_route_add_entry,
 297         .get_entry = tsi57x_route_get_entry,
 298         .clr_table = tsi57x_route_clr_table,
 299         .set_domain = tsi57x_set_domain,
 300         .get_domain = tsi57x_get_domain,
 301         .em_init = tsi57x_em_init,
 302         .em_handle = tsi57x_em_handler,
 303 };
 304
 305 static int tsi57x_probe(struct rio_dev *rdev, const struct rio_device_id *id)
 306 {
 307         pr_debug("RIO: %s for %s\n", __func__, rio_name(rdev));
 308
 309         spin_lock(&rdev->rswitch->lock);
 310
 311         if (rdev->rswitch->ops) {
 312                 spin_unlock(&rdev->rswitch->lock);
 313                 return -EINVAL;
 314         }
 315         rdev->rswitch->ops = &tsi57x_switch_ops;
 316
 317         if (rdev->do_enum) {
 318                 /* Ensure that default routing is disabled on startup */
 319                 rio_write_config_32(rdev, RIO_STD_RTE_DEFAULT_PORT,
 320                                     RIO_INVALID_ROUTE);
 321         }
 322
 323         spin_unlock(&rdev->rswitch->lock);
 324         return 0;
 325 }
 326
 327 static void tsi57x_remove(struct rio_dev *rdev)
 328 {
 329         pr_debug("RIO: %s for %s\n", __func__, rio_name(rdev));
 330         spin_lock(&rdev->rswitch->lock);
 331         if (rdev->rswitch->ops != &tsi57x_switch_ops) {
 332                 spin_unlock(&rdev->rswitch->lock);
 333                 return;
 334         }
 335         rdev->rswitch->ops = NULL;
 336         spin_unlock(&rdev->rswitch->lock);
 337 }
 338
 339 static struct rio_device_id tsi57x_id_table[] = {
 340         {RIO_DEVICE(RIO_DID_TSI572, RIO_VID_TUNDRA)},
 341         {RIO_DEVICE(RIO_DID_TSI574, RIO_VID_TUNDRA)},
 342         {RIO_DEVICE(RIO_DID_TSI577, RIO_VID_TUNDRA)},
 343         {RIO_DEVICE(RIO_DID_TSI578, RIO_VID_TUNDRA)},
 344         { 0, }  /* terminate list */
 345 };
 346
 347 static struct rio_driver tsi57x_driver = {
 348         .name = "tsi57x",
 349         .id_table = tsi57x_id_table,
 350         .probe = tsi57x_probe,
 351         .remove = tsi57x_remove,
 352 };
 353
 354 static int __init tsi57x_init(void)
 355 {
 356         return rio_register_driver(&tsi57x_driver);
 357 }
 358
 359 static void __exit tsi57x_exit(void)
 360 {
 361         rio_unregister_driver(&tsi57x_driver);
 362 }
 363
 364 device_initcall(tsi57x_init);
 365 module_exit(tsi57x_exit);
 366
 367 MODULE_DESCRIPTION("IDT Tsi57x Serial RapidIO switch family driver");
 368 MODULE_AUTHOR("Integrated Device Technology, Inc.");
 369 MODULE_LICENSE("GPL");