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/version.h>
  12 #include <linux/slab.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/proc_fs.h>
  15 #include <linux/device.h>
  16 #include <linux/delay.h>
  17 #include <asm/uaccess.h>
  18 #include <asm/sn/sn_sal.h>
  19 #include <asm/sn/addrs.h>
  20 #include <asm/sn/io.h>
  21 #include <asm/sn/types.h>
  22 #include <asm/sn/shubio.h>
  23 #include <asm/sn/tiocx.h>
  24 #include <asm/sn/l1.h>
  25 #include <asm/sn/module.h>
  26 #include "tio.h"
  27 #include "xtalk/xwidgetdev.h"
  28 #include "xtalk/hubdev.h"
  29
  30 #define CX_DEV_NONE 0
  31 #define DEVICE_NAME "tiocx"
  32 #define WIDGET_ID 0
  33 #define TIOCX_DEBUG 0
  34
  35 #if TIOCX_DEBUG
  36 #define DBG(fmt...)    printk(KERN_ALERT fmt)
  37 #else
  38 #define DBG(fmt...)
  39 #endif
  40
  41 struct device_attribute dev_attr_cxdev_control;
  42
  43 /**
  44  * tiocx_match - Try to match driver id list with device.
  45  * @dev: device pointer
  46  * @drv: driver pointer
  47  *
  48  * Returns 1 if match, 0 otherwise.
  49  */
  50 static int tiocx_match(struct device *dev, struct device_driver *drv)
  51 {
  52         struct cx_dev *cx_dev = to_cx_dev(dev);
  53         struct cx_drv *cx_drv = to_cx_driver(drv);
  54         const struct cx_device_id *ids = cx_drv->id_table;
  55
  56         if (!ids)
  57                 return 0;
  58
  59         while (ids->part_num) {
  60                 if (ids->part_num == cx_dev->cx_id.part_num)
  61                         return 1;
  62                 ids++;
  63         }
  64         return 0;
  65
  66 }
  67
  68 static int tiocx_hotplug(struct device *dev, char **envp, int num_envp,
  69                          char *buffer, int buffer_size)
  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 struct bus_type tiocx_bus_type = {
  80         .name = "tiocx",
  81         .match = tiocx_match,
  82         .hotplug = tiocx_hotplug,
  83 };
  84
  85 /**
  86  * cx_device_match - Find cx_device in the id table.
  87  * @ids: id table from driver
  88  * @cx_device: part/mfg id for the device
  89  *
  90  */
  91 static const struct cx_device_id *cx_device_match(const struct cx_device_id
  92                                                   *ids,
  93                                                   struct cx_dev *cx_device)
  94 {
  95         /*
  96          * NOTES: We may want to check for CX_ANY_ID too.
  97          *        Do we want to match against nasid too?
  98          *        CX_DEV_NONE == 0, if the driver tries to register for
  99          *        part/mfg == 0 we should return no-match (NULL) here.
 100          */
 101         while (ids->part_num && ids->mfg_num) {
 102                 if (ids->part_num == cx_device->cx_id.part_num &&
 103                     ids->mfg_num == cx_device->cx_id.mfg_num)
 104                         return ids;
 105                 ids++;
 106         }
 107
 108         return NULL;
 109 }
 110
 111 /**
 112  * cx_device_probe - Look for matching device.
 113  *                      Call driver probe routine if found.
 114  * @cx_driver: driver table (cx_drv struct) from driver
 115  * @cx_device: part/mfg id for the device
 116  */
 117 static int cx_device_probe(struct device *dev)
 118 {
 119         const struct cx_device_id *id;
 120         struct cx_drv *cx_drv = to_cx_driver(dev->driver);
 121         struct cx_dev *cx_dev = to_cx_dev(dev);
 122         int error = 0;
 123
 124         if (!cx_dev->driver && cx_drv->probe) {
 125                 id = cx_device_match(cx_drv->id_table, cx_dev);
 126                 if (id) {
 127                         if ((error = cx_drv->probe(cx_dev, id)) < 0)
 128                                 return error;
 129                         else
 130                                 cx_dev->driver = cx_drv;
 131                 }
 132         }
 133
 134         return error;
 135 }
 136
 137 /**
 138  * cx_driver_remove - Remove driver from device struct.
 139  * @dev: device
 140  */
 141 static int cx_driver_remove(struct device *dev)
 142 {
 143         struct cx_dev *cx_dev = to_cx_dev(dev);
 144         struct cx_drv *cx_drv = cx_dev->driver;
 145         if (cx_drv->remove)
 146                 cx_drv->remove(cx_dev);
 147         cx_dev->driver = NULL;
 148         return 0;
 149 }
 150
 151 /**
 152  * cx_driver_register - Register the driver.
 153  * @cx_driver: driver table (cx_drv struct) from driver
 154  *
 155  * Called from the driver init routine to register a driver.
 156  * The cx_drv struct contains the driver name, a pointer to
 157  * a table of part/mfg numbers and a pointer to the driver's
 158  * probe/attach routine.
 159  */
 160 int cx_driver_register(struct cx_drv *cx_driver)
 161 {
 162         cx_driver->driver.name = cx_driver->name;
 163         cx_driver->driver.bus = &tiocx_bus_type;
 164         cx_driver->driver.probe = cx_device_probe;
 165         cx_driver->driver.remove = cx_driver_remove;
 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  *
 187  */
 188 int
 189 cx_device_register(nasid_t nasid, int part_num, int mfg_num,
 190                    struct hubdev_info *hubdev)
 191 {
 192         struct cx_dev *cx_dev;
 193
 194         cx_dev = kcalloc(1, sizeof(struct cx_dev), GFP_KERNEL);
 195         DBG("cx_dev= 0x%p\n", cx_dev);
 196         if (cx_dev == NULL)
 197                 return -ENOMEM;
 198
 199         cx_dev->cx_id.part_num = part_num;
 200         cx_dev->cx_id.mfg_num = mfg_num;
 201         cx_dev->cx_id.nasid = nasid;
 202         cx_dev->hubdev = hubdev;
 203
 204         cx_dev->dev.parent = NULL;
 205         cx_dev->dev.bus = &tiocx_bus_type;
 206         cx_dev->dev.release = tiocx_bus_release;
 207         snprintf(cx_dev->dev.bus_id, BUS_ID_SIZE, "%d.0x%x",
 208                  cx_dev->cx_id.nasid, cx_dev->cx_id.part_num);
 209         device_register(&cx_dev->dev);
 210         get_device(&cx_dev->dev);
 211
 212         device_create_file(&cx_dev->dev, &dev_attr_cxdev_control);
 213
 214         return 0;
 215 }
 216
 217 /**
 218  * cx_device_unregister - Unregister a device.
 219  * @cx_dev: part/mfg id for the device
 220  */
 221 int cx_device_unregister(struct cx_dev *cx_dev)
 222 {
 223         put_device(&cx_dev->dev);
 224         device_unregister(&cx_dev->dev);
 225         return 0;
 226 }
 227
 228 /**
 229  * cx_device_reload - Reload the device.
 230  * @nasid: device's nasid
 231  * @part_num: device's part number
 232  * @mfg_num: device's manufacturer number
 233  *
 234  * Remove the device associated with 'nasid' from device list and then
 235  * call device-register with the given part/mfg numbers.
 236  */
 237 static int cx_device_reload(struct cx_dev *cx_dev)
 238 {
 239         device_remove_file(&cx_dev->dev, &dev_attr_cxdev_control);
 240         cx_device_unregister(cx_dev);
 241         return cx_device_register(cx_dev->cx_id.nasid, cx_dev->cx_id.part_num,
 242                                   cx_dev->cx_id.mfg_num, cx_dev->hubdev);
 243 }
 244
 245 static inline uint64_t tiocx_intr_alloc(nasid_t nasid, int widget,
 246                                         u64 sn_irq_info,
 247                                         int req_irq, nasid_t req_nasid,
 248                                         int req_slice)
 249 {
 250         struct ia64_sal_retval rv;
 251         rv.status = 0;
 252         rv.v0 = 0;
 253
 254         ia64_sal_oemcall_nolock(&rv, SN_SAL_IOIF_INTERRUPT,
 255                                 SAL_INTR_ALLOC, nasid,
 256                                 widget, sn_irq_info, req_irq,
 257                                 req_nasid, req_slice);
 258         return rv.status;
 259 }
 260
 261 static inline void tiocx_intr_free(nasid_t nasid, int widget,
 262                                    struct sn_irq_info *sn_irq_info)
 263 {
 264         struct ia64_sal_retval rv;
 265         rv.status = 0;
 266         rv.v0 = 0;
 267
 268         ia64_sal_oemcall_nolock(&rv, SN_SAL_IOIF_INTERRUPT,
 269                                 SAL_INTR_FREE, nasid,
 270                                 widget, sn_irq_info->irq_irq,
 271                                 sn_irq_info->irq_cookie, 0, 0);
 272 }
 273
 274 struct sn_irq_info *tiocx_irq_alloc(nasid_t nasid, int widget, int irq,
 275                                     nasid_t req_nasid, int slice)
 276 {
 277         struct sn_irq_info *sn_irq_info;
 278         int status;
 279         int sn_irq_size = sizeof(struct sn_irq_info);
 280
 281         if ((nasid & 1) == 0)
 282                 return NULL;
 283
 284         sn_irq_info = kmalloc(sn_irq_size, GFP_KERNEL);
 285         if (sn_irq_info == NULL)
 286                 return NULL;
 287
 288         memset(sn_irq_info, 0x0, sn_irq_size);
 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         uint64_t bridge = (uint64_t) 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 uint64_t tiocx_dma_addr(uint64_t addr)
 314 {
 315         return PHYS_TO_TIODMA(addr);
 316 }
 317
 318 uint64_t 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         uint64_t ice_frz;
 336         uint64_t 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 tiocx_btchar_get(int nasid)
 370 {
 371         moduleid_t module_id;
 372         geoid_t geoid;
 373         int cnodeid;
 374
 375         cnodeid = nasid_to_cnodeid(nasid);
 376         geoid = cnodeid_get_geoid(cnodeid);
 377         module_id = geo_module(geoid);
 378         return MODULE_GET_BTCHAR(module_id);
 379 }
 380
 381 static int is_fpga_brick(int nasid)
 382 {
 383         switch (tiocx_btchar_get(nasid)) {
 384         case L1_BRICKTYPE_SA:
 385         case L1_BRICKTYPE_ATHENA:
 386                 return 1;
 387         }
 388         return 0;
 389 }
 390
 391 static int bitstream_loaded(nasid_t nasid)
 392 {
 393         uint64_t cx_credits;
 394
 395         cx_credits = REMOTE_HUB_L(nasid, TIO_ICE_PMI_TX_DYN_CREDIT_STAT_CB3);
 396         cx_credits &= TIO_ICE_PMI_TX_DYN_CREDIT_STAT_CB3_CREDIT_CNT_MASK;
 397         DBG("cx_credits= 0x%lx\n", cx_credits);
 398
 399         return (cx_credits == 0xf) ? 1 : 0;
 400 }
 401
 402 static int tiocx_reload(struct cx_dev *cx_dev)
 403 {
 404         int part_num = CX_DEV_NONE;
 405         int mfg_num = CX_DEV_NONE;
 406         nasid_t nasid = cx_dev->cx_id.nasid;
 407
 408         if (bitstream_loaded(nasid)) {
 409                 uint64_t cx_id;
 410
 411                 cx_id =
 412                     *(volatile int32_t *)(TIO_SWIN_BASE(nasid, TIOCX_CORELET) +
 413                                           WIDGET_ID);
 414                 part_num = XWIDGET_PART_NUM(cx_id);
 415                 mfg_num = XWIDGET_MFG_NUM(cx_id);
 416                 DBG("part= 0x%x, mfg= 0x%x\n", part_num, mfg_num);
 417                 /* just ignore it if it's a CE */
 418                 if (part_num == TIO_CE_ASIC_PARTNUM)
 419                         return 0;
 420         }
 421
 422         cx_dev->cx_id.part_num = part_num;
 423         cx_dev->cx_id.mfg_num = mfg_num;
 424
 425         /*
 426          * Delete old device and register the new one.  It's ok if
 427          * part_num/mfg_num == CX_DEV_NONE.  We want to register
 428          * devices in the table even if a bitstream isn't loaded.
 429          * That allows use to see that a bitstream isn't loaded via
 430          * TIOCX_IOCTL_DEV_LIST.
 431          */
 432         return cx_device_reload(cx_dev);
 433 }
 434
 435 static ssize_t show_cxdev_control(struct device *dev, char *buf)
 436 {
 437         struct cx_dev *cx_dev = to_cx_dev(dev);
 438
 439         return sprintf(buf, "0x%x 0x%x 0x%x %d\n",
 440                        cx_dev->cx_id.nasid,
 441                        cx_dev->cx_id.part_num, cx_dev->cx_id.mfg_num,
 442                        tiocx_btchar_get(cx_dev->cx_id.nasid));
 443 }
 444
 445 static ssize_t store_cxdev_control(struct device *dev, const char *buf,
 446                                    size_t count)
 447 {
 448         int n;
 449         struct cx_dev *cx_dev = to_cx_dev(dev);
 450
 451         if (!capable(CAP_SYS_ADMIN))
 452                 return -EPERM;
 453
 454         if (count <= 0)
 455                 return 0;
 456
 457         n = simple_strtoul(buf, NULL, 0);
 458
 459         switch (n) {
 460         case 1:
 461                 tiocx_reload(cx_dev);
 462                 break;
 463         case 3:
 464                 tio_corelet_reset(cx_dev->cx_id.nasid, TIOCX_CORELET);
 465                 break;
 466         default:
 467                 break;
 468         }
 469
 470         return count;
 471 }
 472
 473 DEVICE_ATTR(cxdev_control, 0644, show_cxdev_control, store_cxdev_control);
 474
 475 static int __init tiocx_init(void)
 476 {
 477         cnodeid_t cnodeid;
 478         int found_tiocx_device = 0;
 479
 480         bus_register(&tiocx_bus_type);
 481
 482         for (cnodeid = 0; cnodeid < MAX_COMPACT_NODES; cnodeid++) {
 483                 nasid_t nasid;
 484
 485                 if ((nasid = cnodeid_to_nasid(cnodeid)) < 0)
 486                         break;  /* No more nasids .. bail out of loop */
 487
 488                 if ((nasid & 0x1) && is_fpga_brick(nasid)) {
 489                         struct hubdev_info *hubdev;
 490                         struct xwidget_info *widgetp;
 491
 492                         DBG("Found TIO at nasid 0x%x\n", nasid);
 493
 494                         hubdev =
 495                             (struct hubdev_info *)(NODEPDA(cnodeid)->pdinfo);
 496
 497                         widgetp = &hubdev->hdi_xwidget_info[TIOCX_CORELET];
 498
 499                         /* The CE hangs off of the CX port but is not an FPGA */
 500                         if (widgetp->xwi_hwid.part_num == TIO_CE_ASIC_PARTNUM)
 501                                 continue;
 502
 503                         tio_corelet_reset(nasid, TIOCX_CORELET);
 504                         tio_conveyor_enable(nasid);
 505
 506                         if (cx_device_register
 507                             (nasid, widgetp->xwi_hwid.part_num,
 508                              widgetp->xwi_hwid.mfg_num, hubdev) < 0)
 509                                 return -ENXIO;
 510                         else
 511                                 found_tiocx_device++;
 512                 }
 513         }
 514
 515         /* It's ok if we find zero devices. */
 516         DBG("found_tiocx_device= %d\n", found_tiocx_device);
 517
 518         return 0;
 519 }
 520
 521 static void __exit tiocx_exit(void)
 522 {
 523         struct device *dev;
 524         struct device *tdev;
 525
 526         DBG("tiocx_exit\n");
 527
 528         /*
 529          * Unregister devices.
 530          */
 531         list_for_each_entry_safe(dev, tdev, &tiocx_bus_type.devices.list,
 532                                  bus_list) {
 533                 if (dev) {
 534                         struct cx_dev *cx_dev = to_cx_dev(dev);
 535                         device_remove_file(dev, &dev_attr_cxdev_control);
 536                         cx_device_unregister(cx_dev);
 537                 }
 538         }
 539
 540         bus_unregister(&tiocx_bus_type);
 541 }
 542
 543 module_init(tiocx_init);
 544 module_exit(tiocx_exit);
 545
 546 /************************************************************************
 547  * Module licensing and description
 548  ************************************************************************/
 549 MODULE_LICENSE("GPL");
 550 MODULE_AUTHOR("Bruce Losure <blosure@sgi.com>");
 551 MODULE_DESCRIPTION("TIOCX module");
 552 MODULE_SUPPORTED_DEVICE(DEVICE_NAME);