Merge branch 'upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik...
[linux-2.6] / 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);