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         int r;
 195
 196         cx_dev = kzalloc(sizeof(struct cx_dev), GFP_KERNEL);
 197         DBG("cx_dev= 0x%p\n", cx_dev);
 198         if (cx_dev == NULL)
 199                 return -ENOMEM;
 200
 201         cx_dev->cx_id.part_num = part_num;
 202         cx_dev->cx_id.mfg_num = mfg_num;
 203         cx_dev->cx_id.nasid = nasid;
 204         cx_dev->hubdev = hubdev;
 205         cx_dev->bt = bt;
 206
 207         cx_dev->dev.parent = NULL;
 208         cx_dev->dev.bus = &tiocx_bus_type;
 209         cx_dev->dev.release = tiocx_bus_release;
 210         dev_set_name(&cx_dev->dev, "%d", cx_dev->cx_id.nasid);
 211         r = device_register(&cx_dev->dev);
 212         if (r) {
 213                 kfree(cx_dev);
 214                 return r;
 215         }
 216         get_device(&cx_dev->dev);
 217
 218         device_create_file(&cx_dev->dev, &dev_attr_cxdev_control);
 219
 220         return 0;
 221 }
 222
 223 /**
 224  * cx_device_unregister - Unregister a device.
 225  * @cx_dev: part/mfg id for the device
 226  */
 227 int cx_device_unregister(struct cx_dev *cx_dev)
 228 {
 229         put_device(&cx_dev->dev);
 230         device_unregister(&cx_dev->dev);
 231         return 0;
 232 }
 233
 234 /**
 235  * cx_device_reload - Reload the device.
 236  * @nasid: device's nasid
 237  * @part_num: device's part number
 238  * @mfg_num: device's manufacturer number
 239  *
 240  * Remove the device associated with 'nasid' from device list and then
 241  * call device-register with the given part/mfg numbers.
 242  */
 243 static int cx_device_reload(struct cx_dev *cx_dev)
 244 {
 245         cx_device_unregister(cx_dev);
 246         return cx_device_register(cx_dev->cx_id.nasid, cx_dev->cx_id.part_num,
 247                                   cx_dev->cx_id.mfg_num, cx_dev->hubdev,
 248                                   cx_dev->bt);
 249 }
 250
 251 static inline u64 tiocx_intr_alloc(nasid_t nasid, int widget,
 252                                         u64 sn_irq_info,
 253                                         int req_irq, nasid_t req_nasid,
 254                                         int req_slice)
 255 {
 256         struct ia64_sal_retval rv;
 257         rv.status = 0;
 258         rv.v0 = 0;
 259
 260         ia64_sal_oemcall_nolock(&rv, SN_SAL_IOIF_INTERRUPT,
 261                                 SAL_INTR_ALLOC, nasid,
 262                                 widget, sn_irq_info, req_irq,
 263                                 req_nasid, req_slice);
 264         return rv.status;
 265 }
 266
 267 static inline void tiocx_intr_free(nasid_t nasid, int widget,
 268                                    struct sn_irq_info *sn_irq_info)
 269 {
 270         struct ia64_sal_retval rv;
 271         rv.status = 0;
 272         rv.v0 = 0;
 273
 274         ia64_sal_oemcall_nolock(&rv, SN_SAL_IOIF_INTERRUPT,
 275                                 SAL_INTR_FREE, nasid,
 276                                 widget, sn_irq_info->irq_irq,
 277                                 sn_irq_info->irq_cookie, 0, 0);
 278 }
 279
 280 struct sn_irq_info *tiocx_irq_alloc(nasid_t nasid, int widget, int irq,
 281                                     nasid_t req_nasid, int slice)
 282 {
 283         struct sn_irq_info *sn_irq_info;
 284         int status;
 285         int sn_irq_size = sizeof(struct sn_irq_info);
 286
 287         if ((nasid & 1) == 0)
 288                 return NULL;
 289
 290         sn_irq_info = kzalloc(sn_irq_size, GFP_KERNEL);
 291         if (sn_irq_info == NULL)
 292                 return NULL;
 293
 294         status = tiocx_intr_alloc(nasid, widget, __pa(sn_irq_info), irq,
 295                                   req_nasid, slice);
 296         if (status) {
 297                 kfree(sn_irq_info);
 298                 return NULL;
 299         } else {
 300                 return sn_irq_info;
 301         }
 302 }
 303
 304 void tiocx_irq_free(struct sn_irq_info *sn_irq_info)
 305 {
 306         u64 bridge = (u64) sn_irq_info->irq_bridge;
 307         nasid_t nasid = NASID_GET(bridge);
 308         int widget;
 309
 310         if (nasid & 1) {
 311                 widget = TIO_SWIN_WIDGETNUM(bridge);
 312                 tiocx_intr_free(nasid, widget, sn_irq_info);
 313                 kfree(sn_irq_info);
 314         }
 315 }
 316
 317 u64 tiocx_dma_addr(u64 addr)
 318 {
 319         return PHYS_TO_TIODMA(addr);
 320 }
 321
 322 u64 tiocx_swin_base(int nasid)
 323 {
 324         return TIO_SWIN_BASE(nasid, TIOCX_CORELET);
 325 }
 326
 327 EXPORT_SYMBOL(cx_driver_register);
 328 EXPORT_SYMBOL(cx_driver_unregister);
 329 EXPORT_SYMBOL(cx_device_register);
 330 EXPORT_SYMBOL(cx_device_unregister);
 331 EXPORT_SYMBOL(tiocx_irq_alloc);
 332 EXPORT_SYMBOL(tiocx_irq_free);
 333 EXPORT_SYMBOL(tiocx_bus_type);
 334 EXPORT_SYMBOL(tiocx_dma_addr);
 335 EXPORT_SYMBOL(tiocx_swin_base);
 336
 337 static void tio_conveyor_set(nasid_t nasid, int enable_flag)
 338 {
 339         u64 ice_frz;
 340         u64 disable_cb = (1ull << 61);
 341
 342         if (!(nasid & 1))
 343                 return;
 344
 345         ice_frz = REMOTE_HUB_L(nasid, TIO_ICE_FRZ_CFG);
 346         if (enable_flag) {
 347                 if (!(ice_frz & disable_cb))    /* already enabled */
 348                         return;
 349                 ice_frz &= ~disable_cb;
 350         } else {
 351                 if (ice_frz & disable_cb)       /* already disabled */
 352                         return;
 353                 ice_frz |= disable_cb;
 354         }
 355         DBG(KERN_ALERT "TIO_ICE_FRZ_CFG= 0x%lx\n", ice_frz);
 356         REMOTE_HUB_S(nasid, TIO_ICE_FRZ_CFG, ice_frz);
 357 }
 358
 359 #define tio_conveyor_enable(nasid) tio_conveyor_set(nasid, 1)
 360 #define tio_conveyor_disable(nasid) tio_conveyor_set(nasid, 0)
 361
 362 static void tio_corelet_reset(nasid_t nasid, int corelet)
 363 {
 364         if (!(nasid & 1))
 365                 return;
 366
 367         REMOTE_HUB_S(nasid, TIO_ICE_PMI_TX_CFG, 1 << corelet);
 368         udelay(2000);
 369         REMOTE_HUB_S(nasid, TIO_ICE_PMI_TX_CFG, 0);
 370         udelay(2000);
 371 }
 372
 373 static int is_fpga_tio(int nasid, int *bt)
 374 {
 375         u16 uninitialized_var(ioboard_type);    /* GCC be quiet */
 376         long rc;
 377
 378         rc = ia64_sn_sysctl_ioboard_get(nasid, &ioboard_type);
 379         if (rc) {
 380                 printk(KERN_WARNING "ia64_sn_sysctl_ioboard_get failed: %ld\n",
 381                        rc);
 382                 return 0;
 383         }
 384
 385         switch (ioboard_type) {
 386         case L1_BRICKTYPE_SA:
 387         case L1_BRICKTYPE_ATHENA:
 388         case L1_BOARDTYPE_DAYTONA:
 389                 *bt = ioboard_type;
 390                 return 1;
 391         }
 392
 393         return 0;
 394 }
 395
 396 static int bitstream_loaded(nasid_t nasid)
 397 {
 398         u64 cx_credits;
 399
 400         cx_credits = REMOTE_HUB_L(nasid, TIO_ICE_PMI_TX_DYN_CREDIT_STAT_CB3);
 401         cx_credits &= TIO_ICE_PMI_TX_DYN_CREDIT_STAT_CB3_CREDIT_CNT_MASK;
 402         DBG("cx_credits= 0x%lx\n", cx_credits);
 403
 404         return (cx_credits == 0xf) ? 1 : 0;
 405 }
 406
 407 static int tiocx_reload(struct cx_dev *cx_dev)
 408 {
 409         int part_num = CX_DEV_NONE;
 410         int mfg_num = CX_DEV_NONE;
 411         nasid_t nasid = cx_dev->cx_id.nasid;
 412
 413         if (bitstream_loaded(nasid)) {
 414                 u64 cx_id;
 415                 int rv;
 416
 417                 rv = ia64_sn_sysctl_tio_clock_reset(nasid);
 418                 if (rv) {
 419                         printk(KERN_ALERT "CX port JTAG reset failed.\n");
 420                 } else {
 421                         cx_id = *(volatile u64 *)
 422                                 (TIO_SWIN_BASE(nasid, TIOCX_CORELET) +
 423                                           WIDGET_ID);
 424                         part_num = XWIDGET_PART_NUM(cx_id);
 425                         mfg_num = XWIDGET_MFG_NUM(cx_id);
 426                         DBG("part= 0x%x, mfg= 0x%x\n", part_num, mfg_num);
 427                         /* just ignore it if it's a CE */
 428                         if (part_num == TIO_CE_ASIC_PARTNUM)
 429                                 return 0;
 430                 }
 431         }
 432
 433         cx_dev->cx_id.part_num = part_num;
 434         cx_dev->cx_id.mfg_num = mfg_num;
 435
 436         /*
 437          * Delete old device and register the new one.  It's ok if
 438          * part_num/mfg_num == CX_DEV_NONE.  We want to register
 439          * devices in the table even if a bitstream isn't loaded.
 440          * That allows use to see that a bitstream isn't loaded via
 441          * TIOCX_IOCTL_DEV_LIST.
 442          */
 443         return cx_device_reload(cx_dev);
 444 }
 445
 446 static ssize_t show_cxdev_control(struct device *dev, struct device_attribute *attr, char *buf)
 447 {
 448         struct cx_dev *cx_dev = to_cx_dev(dev);
 449
 450         return sprintf(buf, "0x%x 0x%x 0x%x 0x%x\n",
 451                        cx_dev->cx_id.nasid,
 452                        cx_dev->cx_id.part_num, cx_dev->cx_id.mfg_num,
 453                        cx_dev->bt);
 454 }
 455
 456 static ssize_t store_cxdev_control(struct device *dev, struct device_attribute *attr, const char *buf,
 457                                    size_t count)
 458 {
 459         int n;
 460         struct cx_dev *cx_dev = to_cx_dev(dev);
 461
 462         if (!capable(CAP_SYS_ADMIN))
 463                 return -EPERM;
 464
 465         if (count <= 0)
 466                 return 0;
 467
 468         n = simple_strtoul(buf, NULL, 0);
 469
 470         switch (n) {
 471         case 1:
 472                 tio_corelet_reset(cx_dev->cx_id.nasid, TIOCX_CORELET);
 473                 tiocx_reload(cx_dev);
 474                 break;
 475         case 2:
 476                 tiocx_reload(cx_dev);
 477                 break;
 478         case 3:
 479                 tio_corelet_reset(cx_dev->cx_id.nasid, TIOCX_CORELET);
 480                 break;
 481         default:
 482                 break;
 483         }
 484
 485         return count;
 486 }
 487
 488 DEVICE_ATTR(cxdev_control, 0644, show_cxdev_control, store_cxdev_control);
 489
 490 static int __init tiocx_init(void)
 491 {
 492         cnodeid_t cnodeid;
 493         int found_tiocx_device = 0;
 494
 495         if (!ia64_platform_is("sn2"))
 496                 return 0;
 497
 498         bus_register(&tiocx_bus_type);
 499
 500         for (cnodeid = 0; cnodeid < num_cnodes; cnodeid++) {
 501                 nasid_t nasid;
 502                 int bt;
 503
 504                 nasid = cnodeid_to_nasid(cnodeid);
 505
 506                 if ((nasid & 0x1) && is_fpga_tio(nasid, &bt)) {
 507                         struct hubdev_info *hubdev;
 508                         struct xwidget_info *widgetp;
 509
 510                         DBG("Found TIO at nasid 0x%x\n", nasid);
 511
 512                         hubdev =
 513                             (struct hubdev_info *)(NODEPDA(cnodeid)->pdinfo);
 514
 515                         widgetp = &hubdev->hdi_xwidget_info[TIOCX_CORELET];
 516
 517                         /* The CE hangs off of the CX port but is not an FPGA */
 518                         if (widgetp->xwi_hwid.part_num == TIO_CE_ASIC_PARTNUM)
 519                                 continue;
 520
 521                         tio_corelet_reset(nasid, TIOCX_CORELET);
 522                         tio_conveyor_enable(nasid);
 523
 524                         if (cx_device_register
 525                             (nasid, widgetp->xwi_hwid.part_num,
 526                              widgetp->xwi_hwid.mfg_num, hubdev, bt) < 0)
 527                                 return -ENXIO;
 528                         else
 529                                 found_tiocx_device++;
 530                 }
 531         }
 532
 533         /* It's ok if we find zero devices. */
 534         DBG("found_tiocx_device= %d\n", found_tiocx_device);
 535
 536         return 0;
 537 }
 538
 539 static int cx_remove_device(struct device * dev, void * data)
 540 {
 541         struct cx_dev *cx_dev = to_cx_dev(dev);
 542         device_remove_file(dev, &dev_attr_cxdev_control);
 543         cx_device_unregister(cx_dev);
 544         return 0;
 545 }
 546
 547 static void __exit tiocx_exit(void)
 548 {
 549         DBG("tiocx_exit\n");
 550
 551         /*
 552          * Unregister devices.
 553          */
 554         bus_for_each_dev(&tiocx_bus_type, NULL, NULL, cx_remove_device);
 555         bus_unregister(&tiocx_bus_type);
 556 }
 557
 558 fs_initcall(tiocx_init);
 559 module_exit(tiocx_exit);
 560
 561 /************************************************************************
 562  * Module licensing and description
 563  ************************************************************************/
 564 MODULE_LICENSE("GPL");
 565 MODULE_AUTHOR("Bruce Losure <blosure@sgi.com>");
 566 MODULE_DESCRIPTION("TIOCX module");
 567 MODULE_SUPPORTED_DEVICE(DEVICE_NAME);