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, char **envp, int num_envp,
  70                          char *buffer, int buffer_size)
  71 {
  72         return -ENODEV;
  73 }
  74
  75 static void tiocx_bus_release(struct device *dev)
  76 {
  77         kfree(to_cx_dev(dev));
  78 }
  79
  80 struct bus_type tiocx_bus_type = {
  81         .name = "tiocx",
  82         .match = tiocx_match,
  83         .uevent = tiocx_uevent,
  84 };
  85
  86 /**
  87  * cx_device_match - Find cx_device in the id table.
  88  * @ids: id table from driver
  89  * @cx_device: part/mfg id for the device
  90  *
  91  */
  92 static const struct cx_device_id *cx_device_match(const struct cx_device_id
  93                                                   *ids,
  94                                                   struct cx_dev *cx_device)
  95 {
  96         /*
  97          * NOTES: We may want to check for CX_ANY_ID too.
  98          *        Do we want to match against nasid too?
  99          *        CX_DEV_NONE == 0, if the driver tries to register for
 100          *        part/mfg == 0 we should return no-match (NULL) here.
 101          */
 102         while (ids->part_num && ids->mfg_num) {
 103                 if (ids->part_num == cx_device->cx_id.part_num &&
 104                     ids->mfg_num == cx_device->cx_id.mfg_num)
 105                         return ids;
 106                 ids++;
 107         }
 108
 109         return NULL;
 110 }
 111
 112 /**
 113  * cx_device_probe - Look for matching device.
 114  *                      Call driver probe routine if found.
 115  * @cx_driver: driver table (cx_drv struct) from driver
 116  * @cx_device: part/mfg id for the device
 117  */
 118 static int cx_device_probe(struct device *dev)
 119 {
 120         const struct cx_device_id *id;
 121         struct cx_drv *cx_drv = to_cx_driver(dev->driver);
 122         struct cx_dev *cx_dev = to_cx_dev(dev);
 123         int error = 0;
 124
 125         if (!cx_dev->driver && cx_drv->probe) {
 126                 id = cx_device_match(cx_drv->id_table, cx_dev);
 127                 if (id) {
 128                         if ((error = cx_drv->probe(cx_dev, id)) < 0)
 129                                 return error;
 130                         else
 131                                 cx_dev->driver = cx_drv;
 132                 }
 133         }
 134
 135         return error;
 136 }
 137
 138 /**
 139  * cx_driver_remove - Remove driver from device struct.
 140  * @dev: device
 141  */
 142 static int cx_driver_remove(struct device *dev)
 143 {
 144         struct cx_dev *cx_dev = to_cx_dev(dev);
 145         struct cx_drv *cx_drv = cx_dev->driver;
 146         if (cx_drv->remove)
 147                 cx_drv->remove(cx_dev);
 148         cx_dev->driver = NULL;
 149         return 0;
 150 }
 151
 152 /**
 153  * cx_driver_register - Register the driver.
 154  * @cx_driver: driver table (cx_drv struct) from driver
 155  *
 156  * Called from the driver init routine to register a driver.
 157  * The cx_drv struct contains the driver name, a pointer to
 158  * a table of part/mfg numbers and a pointer to the driver's
 159  * probe/attach routine.
 160  */
 161 int cx_driver_register(struct cx_drv *cx_driver)
 162 {
 163         cx_driver->driver.name = cx_driver->name;
 164         cx_driver->driver.bus = &tiocx_bus_type;
 165         cx_driver->driver.probe = cx_device_probe;
 166         cx_driver->driver.remove = cx_driver_remove;
 167
 168         return driver_register(&cx_driver->driver);
 169 }
 170
 171 /**
 172  * cx_driver_unregister - Unregister the driver.
 173  * @cx_driver: driver table (cx_drv struct) from driver
 174  */
 175 int cx_driver_unregister(struct cx_drv *cx_driver)
 176 {
 177         driver_unregister(&cx_driver->driver);
 178         return 0;
 179 }
 180
 181 /**
 182  * cx_device_register - Register a device.
 183  * @nasid: device's nasid
 184  * @part_num: device's part number
 185  * @mfg_num: device's manufacturer number
 186  * @hubdev: hub info associated with this device
 187  * @bt: board type of the device
 188  *
 189  */
 190 int
 191 cx_device_register(nasid_t nasid, int part_num, int mfg_num,
 192                    struct hubdev_info *hubdev, int bt)
 193 {
 194         struct cx_dev *cx_dev;
 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         snprintf(cx_dev->dev.bus_id, BUS_ID_SIZE, "%d",
 211                  cx_dev->cx_id.nasid);
 212         device_register(&cx_dev->dev);
 213         get_device(&cx_dev->dev);
 214
 215         device_create_file(&cx_dev->dev, &dev_attr_cxdev_control);
 216
 217         return 0;
 218 }
 219
 220 /**
 221  * cx_device_unregister - Unregister a device.
 222  * @cx_dev: part/mfg id for the device
 223  */
 224 int cx_device_unregister(struct cx_dev *cx_dev)
 225 {
 226         put_device(&cx_dev->dev);
 227         device_unregister(&cx_dev->dev);
 228         return 0;
 229 }
 230
 231 /**
 232  * cx_device_reload - Reload the device.
 233  * @nasid: device's nasid
 234  * @part_num: device's part number
 235  * @mfg_num: device's manufacturer number
 236  *
 237  * Remove the device associated with 'nasid' from device list and then
 238  * call device-register with the given part/mfg numbers.
 239  */
 240 static int cx_device_reload(struct cx_dev *cx_dev)
 241 {
 242         cx_device_unregister(cx_dev);
 243         return cx_device_register(cx_dev->cx_id.nasid, cx_dev->cx_id.part_num,
 244                                   cx_dev->cx_id.mfg_num, cx_dev->hubdev,
 245                                   cx_dev->bt);
 246 }
 247
 248 static inline uint64_t tiocx_intr_alloc(nasid_t nasid, int widget,
 249                                         u64 sn_irq_info,
 250                                         int req_irq, nasid_t req_nasid,
 251                                         int req_slice)
 252 {
 253         struct ia64_sal_retval rv;
 254         rv.status = 0;
 255         rv.v0 = 0;
 256
 257         ia64_sal_oemcall_nolock(&rv, SN_SAL_IOIF_INTERRUPT,
 258                                 SAL_INTR_ALLOC, nasid,
 259                                 widget, sn_irq_info, req_irq,
 260                                 req_nasid, req_slice);
 261         return rv.status;
 262 }
 263
 264 static inline void tiocx_intr_free(nasid_t nasid, int widget,
 265                                    struct sn_irq_info *sn_irq_info)
 266 {
 267         struct ia64_sal_retval rv;
 268         rv.status = 0;
 269         rv.v0 = 0;
 270
 271         ia64_sal_oemcall_nolock(&rv, SN_SAL_IOIF_INTERRUPT,
 272                                 SAL_INTR_FREE, nasid,
 273                                 widget, sn_irq_info->irq_irq,
 274                                 sn_irq_info->irq_cookie, 0, 0);
 275 }
 276
 277 struct sn_irq_info *tiocx_irq_alloc(nasid_t nasid, int widget, int irq,
 278                                     nasid_t req_nasid, int slice)
 279 {
 280         struct sn_irq_info *sn_irq_info;
 281         int status;
 282         int sn_irq_size = sizeof(struct sn_irq_info);
 283
 284         if ((nasid & 1) == 0)
 285                 return NULL;
 286
 287         sn_irq_info = kmalloc(sn_irq_size, GFP_KERNEL);
 288         if (sn_irq_info == NULL)
 289                 return NULL;
 290
 291         memset(sn_irq_info, 0x0, sn_irq_size);
 292
 293         status = tiocx_intr_alloc(nasid, widget, __pa(sn_irq_info), irq,
 294                                   req_nasid, slice);
 295         if (status) {
 296                 kfree(sn_irq_info);
 297                 return NULL;
 298         } else {
 299                 return sn_irq_info;
 300         }
 301 }
 302
 303 void tiocx_irq_free(struct sn_irq_info *sn_irq_info)
 304 {
 305         uint64_t bridge = (uint64_t) sn_irq_info->irq_bridge;
 306         nasid_t nasid = NASID_GET(bridge);
 307         int widget;
 308
 309         if (nasid & 1) {
 310                 widget = TIO_SWIN_WIDGETNUM(bridge);
 311                 tiocx_intr_free(nasid, widget, sn_irq_info);
 312                 kfree(sn_irq_info);
 313         }
 314 }
 315
 316 uint64_t tiocx_dma_addr(uint64_t addr)
 317 {
 318         return PHYS_TO_TIODMA(addr);
 319 }
 320
 321 uint64_t tiocx_swin_base(int nasid)
 322 {
 323         return TIO_SWIN_BASE(nasid, TIOCX_CORELET);
 324 }
 325
 326 EXPORT_SYMBOL(cx_driver_register);
 327 EXPORT_SYMBOL(cx_driver_unregister);
 328 EXPORT_SYMBOL(cx_device_register);
 329 EXPORT_SYMBOL(cx_device_unregister);
 330 EXPORT_SYMBOL(tiocx_irq_alloc);
 331 EXPORT_SYMBOL(tiocx_irq_free);
 332 EXPORT_SYMBOL(tiocx_bus_type);
 333 EXPORT_SYMBOL(tiocx_dma_addr);
 334 EXPORT_SYMBOL(tiocx_swin_base);
 335
 336 static void tio_conveyor_set(nasid_t nasid, int enable_flag)
 337 {
 338         uint64_t ice_frz;
 339         uint64_t disable_cb = (1ull << 61);
 340
 341         if (!(nasid & 1))
 342                 return;
 343
 344         ice_frz = REMOTE_HUB_L(nasid, TIO_ICE_FRZ_CFG);
 345         if (enable_flag) {
 346                 if (!(ice_frz & disable_cb))    /* already enabled */
 347                         return;
 348                 ice_frz &= ~disable_cb;
 349         } else {
 350                 if (ice_frz & disable_cb)       /* already disabled */
 351                         return;
 352                 ice_frz |= disable_cb;
 353         }
 354         DBG(KERN_ALERT "TIO_ICE_FRZ_CFG= 0x%lx\n", ice_frz);
 355         REMOTE_HUB_S(nasid, TIO_ICE_FRZ_CFG, ice_frz);
 356 }
 357
 358 #define tio_conveyor_enable(nasid) tio_conveyor_set(nasid, 1)
 359 #define tio_conveyor_disable(nasid) tio_conveyor_set(nasid, 0)
 360
 361 static void tio_corelet_reset(nasid_t nasid, int corelet)
 362 {
 363         if (!(nasid & 1))
 364                 return;
 365
 366         REMOTE_HUB_S(nasid, TIO_ICE_PMI_TX_CFG, 1 << corelet);
 367         udelay(2000);
 368         REMOTE_HUB_S(nasid, TIO_ICE_PMI_TX_CFG, 0);
 369         udelay(2000);
 370 }
 371
 372 static int is_fpga_tio(int nasid, int *bt)
 373 {
 374         int ioboard_type;
 375
 376         ioboard_type = ia64_sn_sysctl_ioboard_get(nasid);
 377
 378         switch (ioboard_type) {
 379         case L1_BRICKTYPE_SA:
 380         case L1_BRICKTYPE_ATHENA:
 381         case L1_BOARDTYPE_DAYTONA:
 382                 *bt = ioboard_type;
 383                 return 1;
 384         }
 385
 386         return 0;
 387 }
 388
 389 static int bitstream_loaded(nasid_t nasid)
 390 {
 391         uint64_t cx_credits;
 392
 393         cx_credits = REMOTE_HUB_L(nasid, TIO_ICE_PMI_TX_DYN_CREDIT_STAT_CB3);
 394         cx_credits &= TIO_ICE_PMI_TX_DYN_CREDIT_STAT_CB3_CREDIT_CNT_MASK;
 395         DBG("cx_credits= 0x%lx\n", cx_credits);
 396
 397         return (cx_credits == 0xf) ? 1 : 0;
 398 }
 399
 400 static int tiocx_reload(struct cx_dev *cx_dev)
 401 {
 402         int part_num = CX_DEV_NONE;
 403         int mfg_num = CX_DEV_NONE;
 404         nasid_t nasid = cx_dev->cx_id.nasid;
 405
 406         if (bitstream_loaded(nasid)) {
 407                 uint64_t cx_id;
 408                 int rv;
 409
 410                 rv = ia64_sn_sysctl_tio_clock_reset(nasid);
 411                 if (rv) {
 412                         printk(KERN_ALERT "CX port JTAG reset failed.\n");
 413                 } else {
 414                         cx_id = *(volatile uint64_t *)
 415                                 (TIO_SWIN_BASE(nasid, TIOCX_CORELET) +
 416                                           WIDGET_ID);
 417                         part_num = XWIDGET_PART_NUM(cx_id);
 418                         mfg_num = XWIDGET_MFG_NUM(cx_id);
 419                         DBG("part= 0x%x, mfg= 0x%x\n", part_num, mfg_num);
 420                         /* just ignore it if it's a CE */
 421                         if (part_num == TIO_CE_ASIC_PARTNUM)
 422                                 return 0;
 423                 }
 424         }
 425
 426         cx_dev->cx_id.part_num = part_num;
 427         cx_dev->cx_id.mfg_num = mfg_num;
 428
 429         /*
 430          * Delete old device and register the new one.  It's ok if
 431          * part_num/mfg_num == CX_DEV_NONE.  We want to register
 432          * devices in the table even if a bitstream isn't loaded.
 433          * That allows use to see that a bitstream isn't loaded via
 434          * TIOCX_IOCTL_DEV_LIST.
 435          */
 436         return cx_device_reload(cx_dev);
 437 }
 438
 439 static ssize_t show_cxdev_control(struct device *dev, struct device_attribute *attr, char *buf)
 440 {
 441         struct cx_dev *cx_dev = to_cx_dev(dev);
 442
 443         return sprintf(buf, "0x%x 0x%x 0x%x 0x%x\n",
 444                        cx_dev->cx_id.nasid,
 445                        cx_dev->cx_id.part_num, cx_dev->cx_id.mfg_num,
 446                        cx_dev->bt);
 447 }
 448
 449 static ssize_t store_cxdev_control(struct device *dev, struct device_attribute *attr, const char *buf,
 450                                    size_t count)
 451 {
 452         int n;
 453         struct cx_dev *cx_dev = to_cx_dev(dev);
 454
 455         if (!capable(CAP_SYS_ADMIN))
 456                 return -EPERM;
 457
 458         if (count <= 0)
 459                 return 0;
 460
 461         n = simple_strtoul(buf, NULL, 0);
 462
 463         switch (n) {
 464         case 1:
 465                 tio_corelet_reset(cx_dev->cx_id.nasid, TIOCX_CORELET);
 466                 tiocx_reload(cx_dev);
 467                 break;
 468         case 2:
 469                 tiocx_reload(cx_dev);
 470                 break;
 471         case 3:
 472                 tio_corelet_reset(cx_dev->cx_id.nasid, TIOCX_CORELET);
 473                 break;
 474         default:
 475                 break;
 476         }
 477
 478         return count;
 479 }
 480
 481 DEVICE_ATTR(cxdev_control, 0644, show_cxdev_control, store_cxdev_control);
 482
 483 static int __init tiocx_init(void)
 484 {
 485         cnodeid_t cnodeid;
 486         int found_tiocx_device = 0;
 487
 488         if (!ia64_platform_is("sn2"))
 489                 return -ENODEV;
 490
 491         bus_register(&tiocx_bus_type);
 492
 493         for (cnodeid = 0; cnodeid < num_cnodes; cnodeid++) {
 494                 nasid_t nasid;
 495                 int bt;
 496
 497                 nasid = cnodeid_to_nasid(cnodeid);
 498
 499                 if ((nasid & 0x1) && is_fpga_tio(nasid, &bt)) {
 500                         struct hubdev_info *hubdev;
 501                         struct xwidget_info *widgetp;
 502
 503                         DBG("Found TIO at nasid 0x%x\n", nasid);
 504
 505                         hubdev =
 506                             (struct hubdev_info *)(NODEPDA(cnodeid)->pdinfo);
 507
 508                         widgetp = &hubdev->hdi_xwidget_info[TIOCX_CORELET];
 509
 510                         /* The CE hangs off of the CX port but is not an FPGA */
 511                         if (widgetp->xwi_hwid.part_num == TIO_CE_ASIC_PARTNUM)
 512                                 continue;
 513
 514                         tio_corelet_reset(nasid, TIOCX_CORELET);
 515                         tio_conveyor_enable(nasid);
 516
 517                         if (cx_device_register
 518                             (nasid, widgetp->xwi_hwid.part_num,
 519                              widgetp->xwi_hwid.mfg_num, hubdev, bt) < 0)
 520                                 return -ENXIO;
 521                         else
 522                                 found_tiocx_device++;
 523                 }
 524         }
 525
 526         /* It's ok if we find zero devices. */
 527         DBG("found_tiocx_device= %d\n", found_tiocx_device);
 528
 529         return 0;
 530 }
 531
 532 static int cx_remove_device(struct device * dev, void * data)
 533 {
 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         return 0;
 538 }
 539
 540 static void __exit tiocx_exit(void)
 541 {
 542         DBG("tiocx_exit\n");
 543
 544         /*
 545          * Unregister devices.
 546          */
 547         bus_for_each_dev(&tiocx_bus_type, NULL, NULL, cx_remove_device);
 548         bus_unregister(&tiocx_bus_type);
 549 }
 550
 551 subsys_initcall(tiocx_init);
 552 module_exit(tiocx_exit);
 553
 554 /************************************************************************
 555  * Module licensing and description
 556  ************************************************************************/
 557 MODULE_LICENSE("GPL");
 558 MODULE_AUTHOR("Bruce Losure <blosure@sgi.com>");
 559 MODULE_DESCRIPTION("TIOCX module");
 560 MODULE_SUPPORTED_DEVICE(DEVICE_NAME);