Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq
[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, 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 /**
81  * cx_device_match - Find cx_device in the id table.
82  * @ids: id table from driver
83  * @cx_device: part/mfg id for the device
84  *
85  */
86 static const struct cx_device_id *cx_device_match(const struct cx_device_id
87                                                   *ids,
88                                                   struct cx_dev *cx_device)
89 {
90         /*
91          * NOTES: We may want to check for CX_ANY_ID too.
92          *        Do we want to match against nasid too?
93          *        CX_DEV_NONE == 0, if the driver tries to register for
94          *        part/mfg == 0 we should return no-match (NULL) here.
95          */
96         while (ids->part_num && ids->mfg_num) {
97                 if (ids->part_num == cx_device->cx_id.part_num &&
98                     ids->mfg_num == cx_device->cx_id.mfg_num)
99                         return ids;
100                 ids++;
101         }
102
103         return NULL;
104 }
105
106 /**
107  * cx_device_probe - Look for matching device.
108  *                      Call driver probe routine if found.
109  * @cx_driver: driver table (cx_drv struct) from driver
110  * @cx_device: part/mfg id for the device
111  */
112 static int cx_device_probe(struct device *dev)
113 {
114         const struct cx_device_id *id;
115         struct cx_drv *cx_drv = to_cx_driver(dev->driver);
116         struct cx_dev *cx_dev = to_cx_dev(dev);
117         int error = 0;
118
119         if (!cx_dev->driver && cx_drv->probe) {
120                 id = cx_device_match(cx_drv->id_table, cx_dev);
121                 if (id) {
122                         if ((error = cx_drv->probe(cx_dev, id)) < 0)
123                                 return error;
124                         else
125                                 cx_dev->driver = cx_drv;
126                 }
127         }
128
129         return error;
130 }
131
132 /**
133  * cx_driver_remove - Remove driver from device struct.
134  * @dev: device
135  */
136 static int cx_driver_remove(struct device *dev)
137 {
138         struct cx_dev *cx_dev = to_cx_dev(dev);
139         struct cx_drv *cx_drv = cx_dev->driver;
140         if (cx_drv->remove)
141                 cx_drv->remove(cx_dev);
142         cx_dev->driver = NULL;
143         return 0;
144 }
145
146 struct bus_type tiocx_bus_type = {
147         .name = "tiocx",
148         .match = tiocx_match,
149         .uevent = tiocx_uevent,
150         .probe = cx_device_probe,
151         .remove = cx_driver_remove,
152 };
153
154 /**
155  * cx_driver_register - Register the driver.
156  * @cx_driver: driver table (cx_drv struct) from driver
157  * 
158  * Called from the driver init routine to register a driver.
159  * The cx_drv struct contains the driver name, a pointer to
160  * a table of part/mfg numbers and a pointer to the driver's
161  * probe/attach routine.
162  */
163 int cx_driver_register(struct cx_drv *cx_driver)
164 {
165         cx_driver->driver.name = cx_driver->name;
166         cx_driver->driver.bus = &tiocx_bus_type;
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 u64 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 = kzalloc(sn_irq_size, GFP_KERNEL);
288         if (sn_irq_info == NULL)
289                 return NULL;
290
291         status = tiocx_intr_alloc(nasid, widget, __pa(sn_irq_info), irq,
292                                   req_nasid, slice);
293         if (status) {
294                 kfree(sn_irq_info);
295                 return NULL;
296         } else {
297                 return sn_irq_info;
298         }
299 }
300
301 void tiocx_irq_free(struct sn_irq_info *sn_irq_info)
302 {
303         u64 bridge = (u64) sn_irq_info->irq_bridge;
304         nasid_t nasid = NASID_GET(bridge);
305         int widget;
306
307         if (nasid & 1) {
308                 widget = TIO_SWIN_WIDGETNUM(bridge);
309                 tiocx_intr_free(nasid, widget, sn_irq_info);
310                 kfree(sn_irq_info);
311         }
312 }
313
314 u64 tiocx_dma_addr(u64 addr)
315 {
316         return PHYS_TO_TIODMA(addr);
317 }
318
319 u64 tiocx_swin_base(int nasid)
320 {
321         return TIO_SWIN_BASE(nasid, TIOCX_CORELET);
322 }
323
324 EXPORT_SYMBOL(cx_driver_register);
325 EXPORT_SYMBOL(cx_driver_unregister);
326 EXPORT_SYMBOL(cx_device_register);
327 EXPORT_SYMBOL(cx_device_unregister);
328 EXPORT_SYMBOL(tiocx_irq_alloc);
329 EXPORT_SYMBOL(tiocx_irq_free);
330 EXPORT_SYMBOL(tiocx_bus_type);
331 EXPORT_SYMBOL(tiocx_dma_addr);
332 EXPORT_SYMBOL(tiocx_swin_base);
333
334 static void tio_conveyor_set(nasid_t nasid, int enable_flag)
335 {
336         u64 ice_frz;
337         u64 disable_cb = (1ull << 61);
338
339         if (!(nasid & 1))
340                 return;
341
342         ice_frz = REMOTE_HUB_L(nasid, TIO_ICE_FRZ_CFG);
343         if (enable_flag) {
344                 if (!(ice_frz & disable_cb))    /* already enabled */
345                         return;
346                 ice_frz &= ~disable_cb;
347         } else {
348                 if (ice_frz & disable_cb)       /* already disabled */
349                         return;
350                 ice_frz |= disable_cb;
351         }
352         DBG(KERN_ALERT "TIO_ICE_FRZ_CFG= 0x%lx\n", ice_frz);
353         REMOTE_HUB_S(nasid, TIO_ICE_FRZ_CFG, ice_frz);
354 }
355
356 #define tio_conveyor_enable(nasid) tio_conveyor_set(nasid, 1)
357 #define tio_conveyor_disable(nasid) tio_conveyor_set(nasid, 0)
358
359 static void tio_corelet_reset(nasid_t nasid, int corelet)
360 {
361         if (!(nasid & 1))
362                 return;
363
364         REMOTE_HUB_S(nasid, TIO_ICE_PMI_TX_CFG, 1 << corelet);
365         udelay(2000);
366         REMOTE_HUB_S(nasid, TIO_ICE_PMI_TX_CFG, 0);
367         udelay(2000);
368 }
369
370 static int is_fpga_tio(int nasid, int *bt)
371 {
372         u16 uninitialized_var(ioboard_type);    /* GCC be quiet */
373         s64 rc;
374
375         rc = ia64_sn_sysctl_ioboard_get(nasid, &ioboard_type);
376         if (rc) {
377                 printk(KERN_WARNING "ia64_sn_sysctl_ioboard_get failed: %ld\n",
378                        rc);
379                 return 0;
380         }
381
382         switch (ioboard_type) {
383         case L1_BRICKTYPE_SA:
384         case L1_BRICKTYPE_ATHENA:
385         case L1_BOARDTYPE_DAYTONA:
386                 *bt = ioboard_type;
387                 return 1;
388         }
389
390         return 0;
391 }
392
393 static int bitstream_loaded(nasid_t nasid)
394 {
395         u64 cx_credits;
396
397         cx_credits = REMOTE_HUB_L(nasid, TIO_ICE_PMI_TX_DYN_CREDIT_STAT_CB3);
398         cx_credits &= TIO_ICE_PMI_TX_DYN_CREDIT_STAT_CB3_CREDIT_CNT_MASK;
399         DBG("cx_credits= 0x%lx\n", cx_credits);
400
401         return (cx_credits == 0xf) ? 1 : 0;
402 }
403
404 static int tiocx_reload(struct cx_dev *cx_dev)
405 {
406         int part_num = CX_DEV_NONE;
407         int mfg_num = CX_DEV_NONE;
408         nasid_t nasid = cx_dev->cx_id.nasid;
409
410         if (bitstream_loaded(nasid)) {
411                 u64 cx_id;
412                 int rv;
413
414                 rv = ia64_sn_sysctl_tio_clock_reset(nasid);
415                 if (rv) {
416                         printk(KERN_ALERT "CX port JTAG reset failed.\n");
417                 } else {
418                         cx_id = *(volatile u64 *)
419                                 (TIO_SWIN_BASE(nasid, TIOCX_CORELET) +
420                                           WIDGET_ID);
421                         part_num = XWIDGET_PART_NUM(cx_id);
422                         mfg_num = XWIDGET_MFG_NUM(cx_id);
423                         DBG("part= 0x%x, mfg= 0x%x\n", part_num, mfg_num);
424                         /* just ignore it if it's a CE */
425                         if (part_num == TIO_CE_ASIC_PARTNUM)
426                                 return 0;
427                 }
428         }
429
430         cx_dev->cx_id.part_num = part_num;
431         cx_dev->cx_id.mfg_num = mfg_num;
432
433         /*
434          * Delete old device and register the new one.  It's ok if
435          * part_num/mfg_num == CX_DEV_NONE.  We want to register
436          * devices in the table even if a bitstream isn't loaded.
437          * That allows use to see that a bitstream isn't loaded via
438          * TIOCX_IOCTL_DEV_LIST.
439          */
440         return cx_device_reload(cx_dev);
441 }
442
443 static ssize_t show_cxdev_control(struct device *dev, struct device_attribute *attr, char *buf)
444 {
445         struct cx_dev *cx_dev = to_cx_dev(dev);
446
447         return sprintf(buf, "0x%x 0x%x 0x%x 0x%x\n",
448                        cx_dev->cx_id.nasid,
449                        cx_dev->cx_id.part_num, cx_dev->cx_id.mfg_num,
450                        cx_dev->bt);
451 }
452
453 static ssize_t store_cxdev_control(struct device *dev, struct device_attribute *attr, const char *buf,
454                                    size_t count)
455 {
456         int n;
457         struct cx_dev *cx_dev = to_cx_dev(dev);
458
459         if (!capable(CAP_SYS_ADMIN))
460                 return -EPERM;
461
462         if (count <= 0)
463                 return 0;
464
465         n = simple_strtoul(buf, NULL, 0);
466
467         switch (n) {
468         case 1:
469                 tio_corelet_reset(cx_dev->cx_id.nasid, TIOCX_CORELET);
470                 tiocx_reload(cx_dev);
471                 break;
472         case 2:
473                 tiocx_reload(cx_dev);
474                 break;
475         case 3:
476                 tio_corelet_reset(cx_dev->cx_id.nasid, TIOCX_CORELET);
477                 break;
478         default:
479                 break;
480         }
481
482         return count;
483 }
484
485 DEVICE_ATTR(cxdev_control, 0644, show_cxdev_control, store_cxdev_control);
486
487 static int __init tiocx_init(void)
488 {
489         cnodeid_t cnodeid;
490         int found_tiocx_device = 0;
491
492         if (!ia64_platform_is("sn2"))
493                 return 0;
494
495         bus_register(&tiocx_bus_type);
496
497         for (cnodeid = 0; cnodeid < num_cnodes; cnodeid++) {
498                 nasid_t nasid;
499                 int bt;
500
501                 nasid = cnodeid_to_nasid(cnodeid);
502
503                 if ((nasid & 0x1) && is_fpga_tio(nasid, &bt)) {
504                         struct hubdev_info *hubdev;
505                         struct xwidget_info *widgetp;
506
507                         DBG("Found TIO at nasid 0x%x\n", nasid);
508
509                         hubdev =
510                             (struct hubdev_info *)(NODEPDA(cnodeid)->pdinfo);
511
512                         widgetp = &hubdev->hdi_xwidget_info[TIOCX_CORELET];
513
514                         /* The CE hangs off of the CX port but is not an FPGA */
515                         if (widgetp->xwi_hwid.part_num == TIO_CE_ASIC_PARTNUM)
516                                 continue;
517
518                         tio_corelet_reset(nasid, TIOCX_CORELET);
519                         tio_conveyor_enable(nasid);
520
521                         if (cx_device_register
522                             (nasid, widgetp->xwi_hwid.part_num,
523                              widgetp->xwi_hwid.mfg_num, hubdev, bt) < 0)
524                                 return -ENXIO;
525                         else
526                                 found_tiocx_device++;
527                 }
528         }
529
530         /* It's ok if we find zero devices. */
531         DBG("found_tiocx_device= %d\n", found_tiocx_device);
532
533         return 0;
534 }
535
536 static int cx_remove_device(struct device * dev, void * data)
537 {
538         struct cx_dev *cx_dev = to_cx_dev(dev);
539         device_remove_file(dev, &dev_attr_cxdev_control);
540         cx_device_unregister(cx_dev);
541         return 0;
542 }
543
544 static void __exit tiocx_exit(void)
545 {
546         DBG("tiocx_exit\n");
547
548         /*
549          * Unregister devices.
550          */
551         bus_for_each_dev(&tiocx_bus_type, NULL, NULL, cx_remove_device);
552         bus_unregister(&tiocx_bus_type);
553 }
554
555 fs_initcall(tiocx_init);
556 module_exit(tiocx_exit);
557
558 /************************************************************************
559  * Module licensing and description
560  ************************************************************************/
561 MODULE_LICENSE("GPL");
562 MODULE_AUTHOR("Bruce Losure <blosure@sgi.com>");
563 MODULE_DESCRIPTION("TIOCX module");
564 MODULE_SUPPORTED_DEVICE(DEVICE_NAME);