summaryrefslogtreecommitdiffstats
path: root/arch/ia64/sn/kernel/tiocx.c
blob: 2f406f509d44d9ec4fd1b7deee382a5338dcda5a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (c) 2005 Silicon Graphics, Inc.  All rights reserved.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/proc_fs.h>
#include <linux/capability.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/sn/sn_sal.h>
#include <asm/sn/addrs.h>
#include <asm/sn/io.h>
#include <asm/sn/types.h>
#include <asm/sn/shubio.h>
#include <asm/sn/tiocx.h>
#include <asm/sn/l1.h>
#include <asm/sn/module.h>
#include "tio.h"
#include "xtalk/xwidgetdev.h"
#include "xtalk/hubdev.h"

#define CX_DEV_NONE 0
#define DEVICE_NAME "tiocx"
#define WIDGET_ID 0
#define TIOCX_DEBUG 0

#if TIOCX_DEBUG
#define DBG(fmt...)    printk(KERN_ALERT fmt)
#else
#define DBG(fmt...)
#endif

struct device_attribute dev_attr_cxdev_control;

/**
 * tiocx_match - Try to match driver id list with device.
 * @dev: device pointer
 * @drv: driver pointer
 *
 * Returns 1 if match, 0 otherwise.
 */
static int tiocx_match(struct device *dev, struct device_driver *drv)
{
	struct cx_dev *cx_dev = to_cx_dev(dev);
	struct cx_drv *cx_drv = to_cx_driver(drv);
	const struct cx_device_id *ids = cx_drv->id_table;

	if (!ids)
		return 0;

	while (ids->part_num) {
		if (ids->part_num == cx_dev->cx_id.part_num)
			return 1;
		ids++;
	}
	return 0;

}

static int tiocx_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	return -ENODEV;
}

static void tiocx_bus_release(struct device *dev)
{
	kfree(to_cx_dev(dev));
}

/**
 * cx_device_match - Find cx_device in the id table.
 * @ids: id table from driver
 * @cx_device: part/mfg id for the device
 *
 */
static const struct cx_device_id *cx_device_match(const struct cx_device_id
						  *ids,
						  struct cx_dev *cx_device)
{
	/*
	 * NOTES: We may want to check for CX_ANY_ID too.
	 *        Do we want to match against nasid too?
	 *        CX_DEV_NONE == 0, if the driver tries to register for
	 *        part/mfg == 0 we should return no-match (NULL) here.
	 */
	while (ids->part_num && ids->mfg_num) {
		if (ids->part_num == cx_device->cx_id.part_num &&
		    ids->mfg_num == cx_device->cx_id.mfg_num)
			return ids;
		ids++;
	}

	return NULL;
}

/**
 * cx_device_probe - Look for matching device.
 *			Call driver probe routine if found.
 * @cx_driver: driver table (cx_drv struct) from driver
 * @cx_device: part/mfg id for the device
 */
static int cx_device_probe(struct device *dev)
{
	const struct cx_device_id *id;
	struct cx_drv *cx_drv = to_cx_driver(dev->driver);
	struct cx_dev *cx_dev = to_cx_dev(dev);
	int error = 0;

	if (!cx_dev->driver && cx_drv->probe) {
		id = cx_device_match(cx_drv->id_table, cx_dev);
		if (id) {
			if ((error = cx_drv->probe(cx_dev, id)) < 0)
				return error;
			else
				cx_dev->driver = cx_drv;
		}
	}

	return error;
}

/**
 * cx_driver_remove - Remove driver from device struct.
 * @dev: device
 */
static int cx_driver_remove(struct device *dev)
{
	struct cx_dev *cx_dev = to_cx_dev(dev);
	struct cx_drv *cx_drv = cx_dev->driver;
	if (cx_drv->remove)
		cx_drv->remove(cx_dev);
	cx_dev->driver = NULL;
	return 0;
}

struct bus_type tiocx_bus_type = {
	.name = "tiocx",
	.match = tiocx_match,
	.uevent = tiocx_uevent,
	.probe = cx_device_probe,
	.remove = cx_driver_remove,
};

/**
 * cx_driver_register - Register the driver.
 * @cx_driver: driver table (cx_drv struct) from driver
 * 
 * Called from the driver init routine to register a driver.
 * The cx_drv struct contains the driver name, a pointer to
 * a table of part/mfg numbers and a pointer to the driver's
 * probe/attach routine.
 */
int cx_driver_register(struct cx_drv *cx_driver)
{
	cx_driver->driver.name = cx_driver->name;
	cx_driver->driver.bus = &tiocx_bus_type;

	return driver_register(&cx_driver->driver);
}

/**
 * cx_driver_unregister - Unregister the driver.
 * @cx_driver: driver table (cx_drv struct) from driver
 */
int cx_driver_unregister(struct cx_drv *cx_driver)
{
	driver_unregister(&cx_driver->driver);
	return 0;
}

/**
 * cx_device_register - Register a device.
 * @nasid: device's nasid
 * @part_num: device's part number
 * @mfg_num: device's manufacturer number
 * @hubdev: hub info associated with this device
 * @bt: board type of the device
 *
 */
int
cx_device_register(nasid_t nasid, int part_num, int mfg_num,
		   struct hubdev_info *hubdev, int bt)
{
	struct cx_dev *cx_dev;
	int r;

	cx_dev = kzalloc(sizeof(struct cx_dev), GFP_KERNEL);
	DBG("cx_dev= 0x%p\n", cx_dev);
	if (cx_dev == NULL)
		return -ENOMEM;

	cx_dev->cx_id.part_num = part_num;
	cx_dev->cx_id.mfg_num = mfg_num;
	cx_dev->cx_id.nasid = nasid;
	cx_dev->hubdev = hubdev;
	cx_dev->bt = bt;

	cx_dev->dev.parent = NULL;
	cx_dev->dev.bus = &tiocx_bus_type;
	cx_dev->dev.release = tiocx_bus_release;
	dev_set_name(&cx_dev->dev, "%d", cx_dev->cx_id.nasid);
	r = device_register(&cx_dev->dev);
	if (r) {
		kfree(cx_dev);
		return r;
	}
	get_device(&cx_dev->dev);

	device_create_file(&cx_dev->dev, &dev_attr_cxdev_control);

	return 0;
}

/**
 * cx_device_unregister - Unregister a device.
 * @cx_dev: part/mfg id for the device
 */
int cx_device_unregister(struct cx_dev *cx_dev)
{
	put_device(&cx_dev->dev);
	device_unregister(&cx_dev->dev);
	return 0;
}

/**
 * cx_device_reload - Reload the device.
 * @nasid: device's nasid
 * @part_num: device's part number
 * @mfg_num: device's manufacturer number
 *
 * Remove the device associated with 'nasid' from device list and then
 * call device-register with the given part/mfg numbers.
 */
static int cx_device_reload(struct cx_dev *cx_dev)
{
	cx_device_unregister(cx_dev);
	return cx_device_register(cx_dev->cx_id.nasid, cx_dev->cx_id.part_num,
				  cx_dev->cx_id.mfg_num, cx_dev->hubdev,
				  cx_dev->bt);
}

static inline u64 tiocx_intr_alloc(nasid_t nasid, int widget,
					u64 sn_irq_info,
					int req_irq, nasid_t req_nasid,
					int req_slice)
{
	struct ia64_sal_retval rv;
	rv.status = 0;
	rv.v0 = 0;

	ia64_sal_oemcall_nolock(&rv, SN_SAL_IOIF_INTERRUPT,
				SAL_INTR_ALLOC, nasid,
				widget, sn_irq_info, req_irq,
				req_nasid, req_slice);
	return rv.status;
}

static inline void tiocx_intr_free(nasid_t nasid, int widget,
				   struct sn_irq_info *sn_irq_info)
{
	struct ia64_sal_retval rv;
	rv.status = 0;
	rv.v0 = 0;

	ia64_sal_oemcall_nolock(&rv, SN_SAL_IOIF_INTERRUPT,
				SAL_INTR_FREE, nasid,
				widget, sn_irq_info->irq_irq,
				sn_irq_info->irq_cookie, 0, 0);
}

struct sn_irq_info *tiocx_irq_alloc(nasid_t nasid, int widget, int irq,
				    nasid_t req_nasid, int slice)
{
	struct sn_irq_info *sn_irq_info;
	int status;
	int sn_irq_size = sizeof(struct sn_irq_info);

	if ((nasid & 1) == 0)
		return NULL;

	sn_irq_info = kzalloc(sn_irq_size, GFP_KERNEL);
	if (sn_irq_info == NULL)
		return NULL;

	status = tiocx_intr_alloc(nasid, widget, __pa(sn_irq_info), irq,
				  req_nasid, slice);
	if (status) {
		kfree(sn_irq_info);
		return NULL;
	} else {
		return sn_irq_info;
	}
}

void tiocx_irq_free(struct sn_irq_info *sn_irq_info)
{
	u64 bridge = (u64) sn_irq_info->irq_bridge;
	nasid_t nasid = NASID_GET(bridge);
	int widget;

	if (nasid & 1) {
		widget = TIO_SWIN_WIDGETNUM(bridge);
		tiocx_intr_free(nasid, widget, sn_irq_info);
		kfree(sn_irq_info);
	}
}

u64 tiocx_dma_addr(u64 addr)
{
	return PHYS_TO_TIODMA(addr);
}

u64 tiocx_swin_base(int nasid)
{
	return TIO_SWIN_BASE(nasid, TIOCX_CORELET);
}

EXPORT_SYMBOL(cx_driver_register);
EXPORT_SYMBOL(cx_driver_unregister);
EXPORT_SYMBOL(cx_device_register);
EXPORT_SYMBOL(cx_device_unregister);
EXPORT_SYMBOL(tiocx_irq_alloc);
EXPORT_SYMBOL(tiocx_irq_free);
EXPORT_SYMBOL(tiocx_bus_type);
EXPORT_SYMBOL(tiocx_dma_addr);
EXPORT_SYMBOL(tiocx_swin_base);

static void tio_conveyor_set(nasid_t nasid, int enable_flag)
{
	u64 ice_frz;
	u64 disable_cb = (1ull << 61);

	if (!(nasid & 1))
		return;

	ice_frz = REMOTE_HUB_L(nasid, TIO_ICE_FRZ_CFG);
	if (enable_flag) {
		if (!(ice_frz & disable_cb))	/* already enabled */
			return;
		ice_frz &= ~disable_cb;
	} else {
		if (ice_frz & disable_cb)	/* already disabled */
			return;
		ice_frz |= disable_cb;
	}
	DBG(KERN_ALERT "TIO_ICE_FRZ_CFG= 0x%lx\n", ice_frz);
	REMOTE_HUB_S(nasid, TIO_ICE_FRZ_CFG, ice_frz);
}

#define tio_conveyor_enable(nasid) tio_conveyor_set(nasid, 1)
#define tio_conveyor_disable(nasid) tio_conveyor_set(nasid, 0)

static void tio_corelet_reset(nasid_t nasid, int corelet)
{
	if (!(nasid & 1))
		return;

	REMOTE_HUB_S(nasid, TIO_ICE_PMI_TX_CFG, 1 << corelet);
	udelay(2000);
	REMOTE_HUB_S(nasid, TIO_ICE_PMI_TX_CFG, 0);
	udelay(2000);
}

static int is_fpga_tio(int nasid, int *bt)
{
	u16 uninitialized_var(ioboard_type);	/* GCC be quiet */
	long rc;

	rc = ia64_sn_sysctl_ioboard_get(nasid, &ioboard_type);
	if (rc) {
		printk(KERN_WARNING "ia64_sn_sysctl_ioboard_get failed: %ld\n",
		       rc);
		return 0;
	}

	switch (ioboard_type) {
	case L1_BRICKTYPE_SA:
	case L1_BRICKTYPE_ATHENA:
	case L1_BOARDTYPE_DAYTONA:
		*bt = ioboard_type;
		return 1;
	}

	return 0;
}

static int bitstream_loaded(nasid_t nasid)
{
	u64 cx_credits;

	cx_credits = REMOTE_HUB_L(nasid, TIO_ICE_PMI_TX_DYN_CREDIT_STAT_CB3);
	cx_credits &= TIO_ICE_PMI_TX_DYN_CREDIT_STAT_CB3_CREDIT_CNT_MASK;
	DBG("cx_credits= 0x%lx\n", cx_credits);

	return (cx_credits == 0xf) ? 1 : 0;
}

static int tiocx_reload(struct cx_dev *cx_dev)
{
	int part_num = CX_DEV_NONE;
	int mfg_num = CX_DEV_NONE;
	nasid_t nasid = cx_dev->cx_id.nasid;

	if (bitstream_loaded(nasid)) {
		u64 cx_id;
		int rv;

		rv = ia64_sn_sysctl_tio_clock_reset(nasid);
		if (rv) {
			printk(KERN_ALERT "CX port JTAG reset failed.\n");
		} else {
			cx_id = *(volatile u64 *)
				(TIO_SWIN_BASE(nasid, TIOCX_CORELET) +
					  WIDGET_ID);
			part_num = XWIDGET_PART_NUM(cx_id);
			mfg_num = XWIDGET_MFG_NUM(cx_id);
			DBG("part= 0x%x, mfg= 0x%x\n", part_num, mfg_num);
			/* just ignore it if it's a CE */
			if (part_num == TIO_CE_ASIC_PARTNUM)
				return 0;
		}
	}

	cx_dev->cx_id.part_num = part_num;
	cx_dev->cx_id.mfg_num = mfg_num;

	/*
	 * Delete old device and register the new one.  It's ok if
	 * part_num/mfg_num == CX_DEV_NONE.  We want to register
	 * devices in the table even if a bitstream isn't loaded.
	 * That allows use to see that a bitstream isn't loaded via
	 * TIOCX_IOCTL_DEV_LIST.
	 */
	return cx_device_reload(cx_dev);
}

static ssize_t show_cxdev_control(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct cx_dev *cx_dev = to_cx_dev(dev);

	return sprintf(buf, "0x%x 0x%x 0x%x 0x%x\n",
		       cx_dev->cx_id.nasid,
		       cx_dev->cx_id.part_num, cx_dev->cx_id.mfg_num,
		       cx_dev->bt);
}

static ssize_t store_cxdev_control(struct device *dev, struct device_attribute *attr, const char *buf,
				   size_t count)
{
	int n;
	struct cx_dev *cx_dev = to_cx_dev(dev);

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (count <= 0)
		return 0;

	n = simple_strtoul(buf, NULL, 0);

	switch (n) {
	case 1:
		tio_corelet_reset(cx_dev->cx_id.nasid, TIOCX_CORELET);
		tiocx_reload(cx_dev);
		break;
	case 2:
		tiocx_reload(cx_dev);
		break;
	case 3:
		tio_corelet_reset(cx_dev->cx_id.nasid, TIOCX_CORELET);
		break;
	default:
		break;
	}

	return count;
}

DEVICE_ATTR(cxdev_control, 0644, show_cxdev_control, store_cxdev_control);

static int __init tiocx_init(void)
{
	cnodeid_t cnodeid;
	int found_tiocx_device = 0;

	if (!ia64_platform_is("sn2"))
		return 0;

	bus_register(&tiocx_bus_type);

	for (cnodeid = 0; cnodeid < num_cnodes; cnodeid++) {
		nasid_t nasid;
		int bt;

		nasid = cnodeid_to_nasid(cnodeid);

		if ((nasid & 0x1) && is_fpga_tio(nasid, &bt)) {
			struct hubdev_info *hubdev;
			struct xwidget_info *widgetp;

			DBG("Found TIO at nasid 0x%x\n", nasid);

			hubdev =
			    (struct hubdev_info *)(NODEPDA(cnodeid)->pdinfo);

			widgetp = &hubdev->hdi_xwidget_info[TIOCX_CORELET];

			/* The CE hangs off of the CX port but is not an FPGA */
			if (widgetp->xwi_hwid.part_num == TIO_CE_ASIC_PARTNUM)
				continue;

			tio_corelet_reset(nasid, TIOCX_CORELET);
			tio_conveyor_enable(nasid);

			if (cx_device_register
			    (nasid, widgetp->xwi_hwid.part_num,
			     widgetp->xwi_hwid.mfg_num, hubdev, bt) < 0)
				return -ENXIO;
			else
				found_tiocx_device++;
		}
	}

	/* It's ok if we find zero devices. */
	DBG("found_tiocx_device= %d\n", found_tiocx_device);

	return 0;
}

static int cx_remove_device(struct device * dev, void * data)
{
	struct cx_dev *cx_dev = to_cx_dev(dev);
	device_remove_file(dev, &dev_attr_cxdev_control);
	cx_device_unregister(cx_dev);
	return 0;
}

static void __exit tiocx_exit(void)
{
	DBG("tiocx_exit\n");

	/*
	 * Unregister devices.
	 */
	bus_for_each_dev(&tiocx_bus_type, NULL, NULL, cx_remove_device);
	bus_unregister(&tiocx_bus_type);
}

fs_initcall(tiocx_init);
module_exit(tiocx_exit);

/************************************************************************
 * Module licensing and description
 ************************************************************************/
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Bruce Losure <blosure@sgi.com>");
MODULE_DESCRIPTION("TIOCX module");
MODULE_SUPPORTED_DEVICE(DEVICE_NAME);