tiocx.c 12.7 KB
Newer Older
Bruce Losure's avatar
Bruce Losure committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
/*
 * 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/version.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/proc_fs.h>
#include <linux/device.h>
#include <linux/delay.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>
24
25
#include <asm/sn/l1.h>
#include <asm/sn/module.h>
Bruce Losure's avatar
Bruce Losure committed
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
#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_hotplug(struct device *dev, char **envp, int num_envp,
			 char *buffer, int buffer_size)
{
	return -ENODEV;
}

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

struct bus_type tiocx_bus_type = {
	.name = "tiocx",
	.match = tiocx_match,
	.hotplug = tiocx_hotplug,
};

/**
 * 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;
}

/**
 * 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;
	cx_driver->driver.probe = cx_device_probe;
	cx_driver->driver.remove = cx_driver_remove;

	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
 *
 */
int
cx_device_register(nasid_t nasid, int part_num, int mfg_num,
		   struct hubdev_info *hubdev)
{
	struct cx_dev *cx_dev;

	cx_dev = kcalloc(1, 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->dev.parent = NULL;
	cx_dev->dev.bus = &tiocx_bus_type;
	cx_dev->dev.release = tiocx_bus_release;
	snprintf(cx_dev->dev.bus_id, BUS_ID_SIZE, "%d.0x%x",
		 cx_dev->cx_id.nasid, cx_dev->cx_id.part_num);
	device_register(&cx_dev->dev);
	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)
{
	device_remove_file(&cx_dev->dev, &dev_attr_cxdev_control);
	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);
}

static inline uint64_t 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 = kmalloc(sn_irq_size, GFP_KERNEL);
	if (sn_irq_info == NULL)
		return NULL;

	memset(sn_irq_info, 0x0, sn_irq_size);

	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)
{
	uint64_t bridge = (uint64_t) 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);
	}
}

313
uint64_t tiocx_dma_addr(uint64_t addr)
Bruce Losure's avatar
Bruce Losure committed
314
315
316
317
{
	return PHYS_TO_TIODMA(addr);
}

318
uint64_t tiocx_swin_base(int nasid)
Bruce Losure's avatar
Bruce Losure committed
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
{
	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)
{
	uint64_t ice_frz;
	uint64_t 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);
}

369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
static int tiocx_btchar_get(int nasid)
{
	moduleid_t module_id;
	geoid_t geoid;
	int cnodeid;

	cnodeid = nasid_to_cnodeid(nasid);
	geoid = cnodeid_get_geoid(cnodeid);
	module_id = geo_module(geoid);
	return MODULE_GET_BTCHAR(module_id);
}

static int is_fpga_brick(int nasid)
{
	switch (tiocx_btchar_get(nasid)) {
	case L1_BRICKTYPE_SA:
	case L1_BRICKTYPE_ATHENA:
		return 1;
	}
	return 0;
}

static int bitstream_loaded(nasid_t nasid)
Bruce Losure's avatar
Bruce Losure committed
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
{
	uint64_t 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;

408
	if (bitstream_loaded(nasid)) {
Bruce Losure's avatar
Bruce Losure committed
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
		uint64_t cx_id;

		cx_id =
		    *(volatile int32_t *)(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, char *buf)
{
	struct cx_dev *cx_dev = to_cx_dev(dev);

439
	return sprintf(buf, "0x%x 0x%x 0x%x %d\n",
Bruce Losure's avatar
Bruce Losure committed
440
		       cx_dev->cx_id.nasid,
441
442
		       cx_dev->cx_id.part_num, cx_dev->cx_id.mfg_num,
		       tiocx_btchar_get(cx_dev->cx_id.nasid));
Bruce Losure's avatar
Bruce Losure committed
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
}

static ssize_t store_cxdev_control(struct device *dev, 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:
		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;

	bus_register(&tiocx_bus_type);

	for (cnodeid = 0; cnodeid < MAX_COMPACT_NODES; cnodeid++) {
		nasid_t nasid;

		if ((nasid = cnodeid_to_nasid(cnodeid)) < 0)
			break;	/* No more nasids .. bail out of loop */

488
		if ((nasid & 0x1) && is_fpga_brick(nasid)) {
Bruce Losure's avatar
Bruce Losure committed
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
			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) < 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;
}

521
static int cx_remove_device(struct device * dev, void * data)
Bruce Losure's avatar
Bruce Losure committed
522
{
523
524
525
526
527
	struct cx_dev *cx_dev = to_cx_dev(dev);
	device_remove_file(dev, &dev_attr_cxdev_control);
	cx_device_unregister(cx_dev);
	return 0;
}
Bruce Losure's avatar
Bruce Losure committed
528

529
530
static void __exit tiocx_exit(void)
{
Bruce Losure's avatar
Bruce Losure committed
531
532
533
534
535
	DBG("tiocx_exit\n");

	/*
	 * Unregister devices.
	 */
536
	bus_for_each_dev(&tiocx_bus_type, NULL, NULL, cx_remove_device);
Bruce Losure's avatar
Bruce Losure committed
537
538
539
540
541
542
543
544
545
546
547
548
549
	bus_unregister(&tiocx_bus_type);
}

module_init(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);