arch/ia64/sn/kernel/tiocx.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (c) 2005 Silicon Graphics, Inc.  All rights reserved.
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/kernel.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/proc_fs.h>
  14 #include <linux/capability.h>
  15 #include <linux/device.h>
  16 #include <linux/delay.h>
  17 #include <asm/system.h>
  18 #include <asm/uaccess.h>
  19 #include <asm/sn/sn_sal.h>
  20 #include <asm/sn/addrs.h>
  21 #include <asm/sn/io.h>
  22 #include <asm/sn/types.h>
  23 #include <asm/sn/shubio.h>
  24 #include <asm/sn/tiocx.h>
  25 #include <asm/sn/l1.h>
  26 #include <asm/sn/module.h>
  27 #include "tio.h"
  28 #include "xtalk/xwidgetdev.h"
  29 #include "xtalk/hubdev.h"
  30
  31 #define CX_DEV_NONE 0
  32 #define DEVICE_NAME "tiocx"
  33 #define WIDGET_ID 0
  34 #define TIOCX_DEBUG 0
  35
  36 #if TIOCX_DEBUG
  37 #define DBG(fmt...)    printk(KERN_ALERT fmt)
  38 #else
  39 #define DBG(fmt...)
  40 #endif
  41
  42 struct device_attribute dev_attr_cxdev_control;
  43
  44 /**
  45  * tiocx_match - Try to match driver id list with device.
  46  * @dev: device pointer
  47  * @drv: driver pointer
  48  *
  49  * Returns 1 if match, 0 otherwise.
  50  */
  51 static int tiocx_match(struct device *dev, struct device_driver *drv)
  52 {
  53         struct cx_dev *cx_dev = to_cx_dev(dev);
  54         struct cx_drv *cx_drv = to_cx_driver(drv);
  55         const struct cx_device_id *ids = cx_drv->id_table;
  56
  57         if (!ids)
  58                 return 0;
  59
  60         while (ids->part_num) {
  61                 if (ids->part_num == cx_dev->cx_id.part_num)
  62                         return 1;
  63                 ids++;
  64         }
  65         return 0;
  66
  67 }
  68
  69 static int tiocx_uevent(struct device *dev, struct kobj_uevent_env *env)
  70 {
  71         return -ENODEV;
  72 }
  73
  74 static void tiocx_bus_release(struct device *dev)
  75 {
  76         kfree(to_cx_dev(dev));
  77 }
  78
  79 /**
  80  * cx_device_match - Find cx_device in the id table.
  81  * @ids: id table from driver
  82  * @cx_device: part/mfg id for the device
  83  *
  84  */
  85 static const struct cx_device_id *cx_device_match(const struct cx_device_id
  86                                                   *ids,
  87                                                   struct cx_dev *cx_device)
  88 {
  89         /*
  90          * NOTES: We may want to check for CX_ANY_ID too.
  91          *        Do we want to match against nasid too?
  92          *        CX_DEV_NONE == 0, if the driver tries to register for
  93          *        part/mfg == 0 we should return no-match (NULL) here.
  94          */
  95         while (ids->part_num && ids->mfg_num) {
  96                 if (ids->part_num == cx_device->cx_id.part_num &&
  97                     ids->mfg_num == cx_device->cx_id.mfg_num)
  98                         return ids;
  99                 ids++;
 100         }
 101
 102         return NULL;
 103 }
 104
 105 /**
 106  * cx_device_probe - Look for matching device.
 107  *                      Call driver probe routine if found.
 108  * @cx_driver: driver table (cx_drv struct) from driver
 109  * @cx_device: part/mfg id for the device
 110  */
 111 static int cx_device_probe(struct device *dev)
 112 {
 113         const struct cx_device_id *id;
 114         struct cx_drv *cx_drv = to_cx_driver(dev->driver);
 115         struct cx_dev *cx_dev = to_cx_dev(dev);
 116         int error = 0;
 117
 118         if (!cx_dev->driver && cx_drv->probe) {
 119                 id = cx_device_match(cx_drv->id_table, cx_dev);
 120                 if (id) {
 121                         if ((error = cx_drv->probe(cx_dev, id)) < 0)
 122                                 return error;
 123                         else
 124                                 cx_dev->driver = cx_drv;
 125                 }
 126         }
 127
 128         return error;
 129 }
 130
 131 /**
 132  * cx_driver_remove - Remove driver from device struct.
 133  * @dev: device
 134  */
 135 static int cx_driver_remove(struct device *dev)
 136 {
 137         struct cx_dev *cx_dev = to_cx_dev(dev);
 138         struct cx_drv *cx_drv = cx_dev->driver;
 139         if (cx_drv->remove)
 140                 cx_drv->remove(cx_dev);
 141         cx_dev->driver = NULL;
 142         return 0;
 143 }
 144
 145 struct bus_type tiocx_bus_type = {
 146         .name = "tiocx",
 147         .match = tiocx_match,
 148         .uevent = tiocx_uevent,
 149         .probe = cx_device_probe,
 150         .remove = cx_driver_remove,
 151 };
 152
 153 /**
 154  * cx_driver_register - Register the driver.
 155  * @cx_driver: driver table (cx_drv struct) from driver
 156  *
 157  * Called from the driver init routine to register a driver.
 158  * The cx_drv struct contains the driver name, a pointer to
 159  * a table of part/mfg numbers and a pointer to the driver's
 160  * probe/attach routine.
 161  */
 162 int cx_driver_register(struct cx_drv *cx_driver)
 163 {
 164         cx_driver->driver.name = cx_driver->name;
 165         cx_driver->driver.bus = &tiocx_bus_type;
 166
 167         return driver_register(&cx_driver->driver);
 168 }
 169
 170 /**
 171  * cx_driver_unregister - Unregister the driver.
 172  * @cx_driver: driver table (cx_drv struct) from driver
 173  */
 174 int cx_driver_unregister(struct cx_drv *cx_driver)
 175 {
 176         driver_unregister(&cx_driver->driver);
 177         return 0;
 178 }
 179
 180 /**
 181  * cx_device_register - Register a device.
 182  * @nasid: device's nasid
 183  * @part_num: device's part number
 184  * @mfg_num: device's manufacturer number
 185  * @hubdev: hub info associated with this device
 186  * @bt: board type of the device
 187  *
 188  */
 189 int
 190 cx_device_register(nasid_t nasid, int part_num, int mfg_num,
 191                    struct hubdev_info *hubdev, int bt)
 192 {
 193         struct cx_dev *cx_dev;
 194
 195         cx_dev = kzalloc(sizeof(struct cx_dev), GFP_KERNEL);
 196         DBG("cx_dev= 0x%p\n", cx_dev);
 197         if (cx_dev == NULL)
 198                 return -ENOMEM;
 199
 200         cx_dev->cx_id.part_num = part_num;
 201         cx_dev->cx_id.mfg_num = mfg_num;
 202         cx_dev->cx_id.nasid = nasid;
 203         cx_dev->hubdev = hubdev;
 204         cx_dev->bt = bt;
 205
 206         cx_dev->dev.parent = NULL;
 207         cx_dev->dev.bus = &tiocx_bus_type;
 208         cx_dev->dev.release = tiocx_bus_release;
 209         snprintf(cx_dev->dev.bus_id, BUS_ID_SIZE, "%d",
 210                  cx_dev->cx_id.nasid);
 211         device_register(&cx_dev->dev);
 212         get_device(&cx_dev->dev);
 213
 214         device_create_file(&cx_dev->dev, &dev_attr_cxdev_control);
 215
 216         return 0;
 217 }
 218
 219 /**
 220  * cx_device_unregister - Unregister a device.
 221  * @cx_dev: part/mfg id for the device
 222  */
 223 int cx_device_unregister(struct cx_dev *cx_dev)
 224 {
 225         put_device(&cx_dev->dev);
 226         device_unregister(&cx_dev->dev);
 227         return 0;
 228 }
 229
 230 /**
 231  * cx_device_reload - Reload the device.
 232  * @nasid: device's nasid
 233  * @part_num: device's part number
 234  * @mfg_num: device's manufacturer number
 235  *
 236  * Remove the device associated with 'nasid' from device list and then
 237  * call device-register with the given part/mfg numbers.
 238  */
 239 static int cx_device_reload(struct cx_dev *cx_dev)
 240 {
 241         cx_device_unregister(cx_dev);
 242         return cx_device_register(cx_dev->cx_id.nasid, cx_dev->cx_id.part_num,
 243                                   cx_dev->cx_id.mfg_num, cx_dev->hubdev,
 244                                   cx_dev->bt);
 245 }
 246
 247 static inline u64 tiocx_intr_alloc(nasid_t nasid, int widget,
 248                                         u64 sn_irq_info,
 249                                         int req_irq, nasid_t req_nasid,
 250                                         int req_slice)
 251 {
 252         struct ia64_sal_retval rv;
 253         rv.status = 0;
 254         rv.v0 = 0;
 255
 256         ia64_sal_oemcall_nolock(&rv, SN_SAL_IOIF_INTERRUPT,
 257                                 SAL_INTR_ALLOC, nasid,
 258                                 widget, sn_irq_info, req_irq,
 259                                 req_nasid, req_slice);
 260         return rv.status;
 261 }
 262
 263 static inline void tiocx_intr_free(nasid_t nasid, int widget,
 264                                    struct sn_irq_info *sn_irq_info)
 265 {
 266         struct ia64_sal_retval rv;
 267         rv.status = 0;
 268         rv.v0 = 0;
 269
 270         ia64_sal_oemcall_nolock(&rv, SN_SAL_IOIF_INTERRUPT,
 271                                 SAL_INTR_FREE, nasid,
 272                                 widget, sn_irq_info->irq_irq,
 273                                 sn_irq_info->irq_cookie, 0, 0);
 274 }
 275
 276 struct sn_irq_info *tiocx_irq_alloc(nasid_t nasid, int widget, int irq,
 277                                     nasid_t req_nasid, int slice)
 278 {
 279         struct sn_irq_info *sn_irq_info;
 280         int status;
 281         int sn_irq_size = sizeof(struct sn_irq_info);
 282
 283         if ((nasid & 1) == 0)
 284                 return NULL;
 285
 286         sn_irq_info = kzalloc(sn_irq_size, GFP_KERNEL);
 287         if (sn_irq_info == NULL)
 288                 return NULL;
 289
 290         status = tiocx_intr_alloc(nasid, widget, __pa(sn_irq_info), irq,
 291                                   req_nasid, slice);
 292         if (status) {
 293                 kfree(sn_irq_info);
 294                 return NULL;
 295         } else {
 296                 return sn_irq_info;
 297         }
 298 }
 299
 300 void tiocx_irq_free(struct sn_irq_info *sn_irq_info)
 301 {
 302         u64 bridge = (u64) sn_irq_info->irq_bridge;
 303         nasid_t nasid = NASID_GET(bridge);
 304         int widget;
 305
 306         if (nasid & 1) {
 307                 widget = TIO_SWIN_WIDGETNUM(bridge);
 308                 tiocx_intr_free(nasid, widget, sn_irq_info);
 309                 kfree(sn_irq_info);
 310         }
 311 }
 312
 313 u64 tiocx_dma_addr(u64 addr)
 314 {
 315         return PHYS_TO_TIODMA(addr);
 316 }
 317
 318 u64 tiocx_swin_base(int nasid)
 319 {
 320         return TIO_SWIN_BASE(nasid, TIOCX_CORELET);
 321 }
 322
 323 EXPORT_SYMBOL(cx_driver_register);
 324 EXPORT_SYMBOL(cx_driver_unregister);
 325 EXPORT_SYMBOL(cx_device_register);
 326 EXPORT_SYMBOL(cx_device_unregister);
 327 EXPORT_SYMBOL(tiocx_irq_alloc);
 328 EXPORT_SYMBOL(tiocx_irq_free);
 329 EXPORT_SYMBOL(tiocx_bus_type);
 330 EXPORT_SYMBOL(tiocx_dma_addr);
 331 EXPORT_SYMBOL(tiocx_swin_base);
 332
 333 static void tio_conveyor_set(nasid_t nasid, int enable_flag)
 334 {
 335         u64 ice_frz;
 336         u64 disable_cb = (1ull << 61);
 337
 338         if (!(nasid & 1))
 339                 return;
 340
 341         ice_frz = REMOTE_HUB_L(nasid, TIO_ICE_FRZ_CFG);
 342         if (enable_flag) {
 343                 if (!(ice_frz & disable_cb))    /* already enabled */
 344                         return;
 345                 ice_frz &= ~disable_cb;
 346         } else {
 347                 if (ice_frz & disable_cb)       /* already disabled */
 348                         return;
 349                 ice_frz |= disable_cb;
 350         }
 351         DBG(KERN_ALERT "TIO_ICE_FRZ_CFG= 0x%lx\n", ice_frz);
 352         REMOTE_HUB_S(nasid, TIO_ICE_FRZ_CFG, ice_frz);
 353 }
 354
 355 #define tio_conveyor_enable(nasid) tio_conveyor_set(nasid, 1)
 356 #define tio_conveyor_disable(nasid) tio_conveyor_set(nasid, 0)
 357
 358 static void tio_corelet_reset(nasid_t nasid, int corelet)
 359 {
 360         if (!(nasid & 1))
 361                 return;
 362
 363         REMOTE_HUB_S(nasid, TIO_ICE_PMI_TX_CFG, 1 << corelet);
 364         udelay(2000);
 365         REMOTE_HUB_S(nasid, TIO_ICE_PMI_TX_CFG, 0);
 366         udelay(2000);
 367 }
 368
 369 static int is_fpga_tio(int nasid, int *bt)
 370 {
 371         u16 uninitialized_var(ioboard_type);    /* GCC be quiet */
 372         s64 rc;
 373
 374         rc = ia64_sn_sysctl_ioboard_get(nasid, &ioboard_type);
 375         if (rc) {
 376                 printk(KERN_WARNING "ia64_sn_sysctl_ioboard_get failed: %ld\n",
 377                        rc);
 378                 return 0;
 379         }
 380
 381         switch (ioboard_type) {
 382         case L1_BRICKTYPE_SA:
 383         case L1_BRICKTYPE_ATHENA:
 384         case L1_BOARDTYPE_DAYTONA:
 385                 *bt = ioboard_type;
 386                 return 1;
 387         }
 388
 389         return 0;
 390 }
 391
 392 static int bitstream_loaded(nasid_t nasid)
 393 {
 394         u64 cx_credits;
 395
 396         cx_credits = REMOTE_HUB_L(nasid, TIO_ICE_PMI_TX_DYN_CREDIT_STAT_CB3);
 397         cx_credits &= TIO_ICE_PMI_TX_DYN_CREDIT_STAT_CB3_CREDIT_CNT_MASK;
 398         DBG("cx_credits= 0x%lx\n", cx_credits);
 399
 400         return (cx_credits == 0xf) ? 1 : 0;
 401 }
 402
 403 static int tiocx_reload(struct cx_dev *cx_dev)
 404 {
 405         int part_num = CX_DEV_NONE;
 406         int mfg_num = CX_DEV_NONE;
 407         nasid_t nasid = cx_dev->cx_id.nasid;
 408
 409         if (bitstream_loaded(nasid)) {
 410                 u64 cx_id;
 411                 int rv;
 412
 413                 rv = ia64_sn_sysctl_tio_clock_reset(nasid);
 414                 if (rv) {
 415                         printk(KERN_ALERT "CX port JTAG reset failed.\n");
 416                 } else {
 417                         cx_id = *(volatile u64 *)
 418                                 (TIO_SWIN_BASE(nasid, TIOCX_CORELET) +
 419                                           WIDGET_ID);
 420                         part_num = XWIDGET_PART_NUM(cx_id);
 421                         mfg_num = XWIDGET_MFG_NUM(cx_id);
 422                         DBG("part= 0x%x, mfg= 0x%x\n", part_num, mfg_num);
 423                         /* just ignore it if it's a CE */
 424                         if (part_num == TIO_CE_ASIC_PARTNUM)
 425                                 return 0;
 426                 }
 427         }
 428
 429         cx_dev->cx_id.part_num = part_num;
 430         cx_dev->cx_id.mfg_num = mfg_num;
 431
 432         /*
 433          * Delete old device and register the new one.  It's ok if
 434          * part_num/mfg_num == CX_DEV_NONE.  We want to register
 435          * devices in the table even if a bitstream isn't loaded.
 436          * That allows use to see that a bitstream isn't loaded via
 437          * TIOCX_IOCTL_DEV_LIST.
 438          */
 439         return cx_device_reload(cx_dev);
 440 }
 441
 442 static ssize_t show_cxdev_control(struct device *dev, struct device_attribute *attr, char *buf)
 443 {
 444         struct cx_dev *cx_dev = to_cx_dev(dev);
 445
 446         return sprintf(buf, "0x%x 0x%x 0x%x 0x%x\n",
 447                        cx_dev->cx_id.nasid,
 448                        cx_dev->cx_id.part_num, cx_dev->cx_id.mfg_num,
 449                        cx_dev->bt);
 450 }
 451
 452 static ssize_t store_cxdev_control(struct device *dev, struct device_attribute *attr, const char *buf,
 453                                    size_t count)
 454 {
 455         int n;
 456         struct cx_dev *cx_dev = to_cx_dev(dev);
 457
 458         if (!capable(CAP_SYS_ADMIN))
 459                 return -EPERM;
 460
 461         if (count <= 0)
 462                 return 0;
 463
 464         n = simple_strtoul(buf, NULL, 0);
 465
 466         switch (n) {
 467         case 1:
 468                 tio_corelet_reset(cx_dev->cx_id.nasid, TIOCX_CORELET);
 469                 tiocx_reload(cx_dev);
 470                 break;
 471         case 2:
 472                 tiocx_reload(cx_dev);
 473                 break;
 474         case 3:
 475                 tio_corelet_reset(cx_dev->cx_id.nasid, TIOCX_CORELET);
 476                 break;
 477         default:
 478                 break;
 479         }
 480
 481         return count;
 482 }
 483
 484 DEVICE_ATTR(cxdev_control, 0644, show_cxdev_control, store_cxdev_control);
 485
 486 static int __init tiocx_init(void)
 487 {
 488         cnodeid_t cnodeid;
 489         int found_tiocx_device = 0;
 490
 491         if (!ia64_platform_is("sn2"))
 492                 return 0;
 493
 494         bus_register(&tiocx_bus_type);
 495
 496         for (cnodeid = 0; cnodeid < num_cnodes; cnodeid++) {
 497                 nasid_t nasid;
 498                 int bt;
 499
 500                 nasid = cnodeid_to_nasid(cnodeid);
 501
 502                 if ((nasid & 0x1) && is_fpga_tio(nasid, &bt)) {
 503                         struct hubdev_info *hubdev;
 504                         struct xwidget_info *widgetp;
 505
 506                         DBG("Found TIO at nasid 0x%x\n", nasid);
 507
 508                         hubdev =
 509                             (struct hubdev_info *)(NODEPDA(cnodeid)->pdinfo);
 510
 511                         widgetp = &hubdev->hdi_xwidget_info[TIOCX_CORELET];
 512
 513                         /* The CE hangs off of the CX port but is not an FPGA */
 514                         if (widgetp->xwi_hwid.part_num == TIO_CE_ASIC_PARTNUM)
 515                                 continue;
 516
 517                         tio_corelet_reset(nasid, TIOCX_CORELET);
 518                         tio_conveyor_enable(nasid);
 519
 520                         if (cx_device_register
 521                             (nasid, widgetp->xwi_hwid.part_num,
 522                              widgetp->xwi_hwid.mfg_num, hubdev, bt) < 0)
 523                                 return -ENXIO;
 524                         else
 525                                 found_tiocx_device++;
 526                 }
 527         }
 528
 529         /* It's ok if we find zero devices. */
 530         DBG("found_tiocx_device= %d\n", found_tiocx_device);
 531
 532         return 0;
 533 }
 534
 535 static int cx_remove_device(struct device * dev, void * data)
 536 {
 537         struct cx_dev *cx_dev = to_cx_dev(dev);
 538         device_remove_file(dev, &dev_attr_cxdev_control);
 539         cx_device_unregister(cx_dev);
 540         return 0;
 541 }
 542
 543 static void __exit tiocx_exit(void)
 544 {
 545         DBG("tiocx_exit\n");
 546
 547         /*
 548          * Unregister devices.
 549          */
 550         bus_for_each_dev(&tiocx_bus_type, NULL, NULL, cx_remove_device);
 551         bus_unregister(&tiocx_bus_type);
 552 }
 553
 554 fs_initcall(tiocx_init);
 555 module_exit(tiocx_exit);
 556
 557 /************************************************************************
 558  * Module licensing and description
 559  ************************************************************************/
 560 MODULE_LICENSE("GPL");
 561 MODULE_AUTHOR("Bruce Losure <blosure@sgi.com>");
 562 MODULE_DESCRIPTION("TIOCX module");
 563 MODULE_SUPPORTED_DEVICE(DEVICE_NAME);