aboutsummaryrefslogtreecommitdiff
path: root/drivers/ptp/ptp_ocp.c
blob: 530e5f90095e6cf2d879376744d531254a02dc3b (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
// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2020 Facebook */

#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/ptp_clock_kernel.h>

static const struct pci_device_id ptp_ocp_pcidev_id[] = {
	{ PCI_DEVICE(0x1d9b, 0x0400) },
	{ 0 }
};
MODULE_DEVICE_TABLE(pci, ptp_ocp_pcidev_id);

#define OCP_REGISTER_OFFSET	0x01000000

struct ocp_reg {
	u32	ctrl;
	u32	status;
	u32	select;
	u32	version;
	u32	time_ns;
	u32	time_sec;
	u32	__pad0[2];
	u32	adjust_ns;
	u32	adjust_sec;
	u32	__pad1[2];
	u32	offset_ns;
	u32	offset_window_ns;
};

#define OCP_CTRL_ENABLE		BIT(0)
#define OCP_CTRL_ADJUST_TIME	BIT(1)
#define OCP_CTRL_ADJUST_OFFSET	BIT(2)
#define OCP_CTRL_READ_TIME_REQ	BIT(30)
#define OCP_CTRL_READ_TIME_DONE	BIT(31)

#define OCP_STATUS_IN_SYNC	BIT(0)

#define OCP_SELECT_CLK_NONE	0
#define OCP_SELECT_CLK_REG	6

struct tod_reg {
	u32	ctrl;
	u32	status;
	u32	uart_polarity;
	u32	version;
	u32	correction_sec;
	u32	__pad0[3];
	u32	uart_baud;
	u32	__pad1[3];
	u32	utc_status;
	u32	leap;
};

#define TOD_REGISTER_OFFSET	0x01050000

#define TOD_CTRL_PROTOCOL	BIT(28)
#define TOD_CTRL_DISABLE_FMT_A	BIT(17)
#define TOD_CTRL_DISABLE_FMT_B	BIT(16)
#define TOD_CTRL_ENABLE		BIT(0)
#define TOD_CTRL_GNSS_MASK	((1U << 4) - 1)
#define TOD_CTRL_GNSS_SHIFT	24

#define TOD_STATUS_UTC_MASK	0xff
#define TOD_STATUS_UTC_VALID	BIT(8)
#define TOD_STATUS_LEAP_VALID	BIT(16)

struct ptp_ocp {
	struct pci_dev		*pdev;
	spinlock_t		lock;
	void __iomem		*base;
	struct ocp_reg __iomem	*reg;
	struct tod_reg __iomem	*tod;
	struct ptp_clock	*ptp;
	struct ptp_clock_info	ptp_info;
};

static int
__ptp_ocp_gettime_locked(struct ptp_ocp *bp, struct timespec64 *ts,
			 struct ptp_system_timestamp *sts)
{
	u32 ctrl, time_sec, time_ns;
	int i;

	ctrl = ioread32(&bp->reg->ctrl);
	ctrl |= OCP_CTRL_READ_TIME_REQ;

	ptp_read_system_prets(sts);
	iowrite32(ctrl, &bp->reg->ctrl);

	for (i = 0; i < 100; i++) {
		ctrl = ioread32(&bp->reg->ctrl);
		if (ctrl & OCP_CTRL_READ_TIME_DONE)
			break;
	}
	ptp_read_system_postts(sts);

	time_ns = ioread32(&bp->reg->time_ns);
	time_sec = ioread32(&bp->reg->time_sec);

	ts->tv_sec = time_sec;
	ts->tv_nsec = time_ns;

	return ctrl & OCP_CTRL_READ_TIME_DONE ? 0 : -ETIMEDOUT;
}

static int
ptp_ocp_gettimex(struct ptp_clock_info *ptp_info, struct timespec64 *ts,
		 struct ptp_system_timestamp *sts)
{
	struct ptp_ocp *bp = container_of(ptp_info, struct ptp_ocp, ptp_info);
	unsigned long flags;
	int err;

	spin_lock_irqsave(&bp->lock, flags);
	err = __ptp_ocp_gettime_locked(bp, ts, sts);
	spin_unlock_irqrestore(&bp->lock, flags);

	return err;
}

static void
__ptp_ocp_settime_locked(struct ptp_ocp *bp, const struct timespec64 *ts)
{
	u32 ctrl, time_sec, time_ns;
	u32 select;

	time_ns = ts->tv_nsec;
	time_sec = ts->tv_sec;

	select = ioread32(&bp->reg->select);
	iowrite32(OCP_SELECT_CLK_REG, &bp->reg->select);

	iowrite32(time_ns, &bp->reg->adjust_ns);
	iowrite32(time_sec, &bp->reg->adjust_sec);

	ctrl = ioread32(&bp->reg->ctrl);
	ctrl |= OCP_CTRL_ADJUST_TIME;
	iowrite32(ctrl, &bp->reg->ctrl);

	/* restore clock selection */
	iowrite32(select >> 16, &bp->reg->select);
}

static int
ptp_ocp_settime(struct ptp_clock_info *ptp_info, const struct timespec64 *ts)
{
	struct ptp_ocp *bp = container_of(ptp_info, struct ptp_ocp, ptp_info);
	unsigned long flags;

	if (ioread32(&bp->reg->status) & OCP_STATUS_IN_SYNC)
		return 0;

	spin_lock_irqsave(&bp->lock, flags);
	__ptp_ocp_settime_locked(bp, ts);
	spin_unlock_irqrestore(&bp->lock, flags);

	return 0;
}

static int
ptp_ocp_adjtime(struct ptp_clock_info *ptp_info, s64 delta_ns)
{
	struct ptp_ocp *bp = container_of(ptp_info, struct ptp_ocp, ptp_info);
	struct timespec64 ts;
	unsigned long flags;
	int err;

	if (ioread32(&bp->reg->status) & OCP_STATUS_IN_SYNC)
		return 0;

	spin_lock_irqsave(&bp->lock, flags);
	err = __ptp_ocp_gettime_locked(bp, &ts, NULL);
	if (likely(!err)) {
		timespec64_add_ns(&ts, delta_ns);
		__ptp_ocp_settime_locked(bp, &ts);
	}
	spin_unlock_irqrestore(&bp->lock, flags);

	return err;
}

static int
ptp_ocp_null_adjfine(struct ptp_clock_info *ptp_info, long scaled_ppm)
{
	if (scaled_ppm == 0)
		return 0;

	return -EOPNOTSUPP;
}

static const struct ptp_clock_info ptp_ocp_clock_info = {
	.owner		= THIS_MODULE,
	.name		= KBUILD_MODNAME,
	.max_adj	= 100000000,
	.gettimex64	= ptp_ocp_gettimex,
	.settime64	= ptp_ocp_settime,
	.adjtime	= ptp_ocp_adjtime,
	.adjfine	= ptp_ocp_null_adjfine,
};

static int
ptp_ocp_check_clock(struct ptp_ocp *bp)
{
	struct timespec64 ts;
	bool sync;
	u32 ctrl;

	/* make sure clock is enabled */
	ctrl = ioread32(&bp->reg->ctrl);
	ctrl |= OCP_CTRL_ENABLE;
	iowrite32(ctrl, &bp->reg->ctrl);

	if ((ioread32(&bp->reg->ctrl) & OCP_CTRL_ENABLE) == 0) {
		dev_err(&bp->pdev->dev, "clock not enabled\n");
		return -ENODEV;
	}

	sync = ioread32(&bp->reg->status) & OCP_STATUS_IN_SYNC;
	if (!sync) {
		ktime_get_real_ts64(&ts);
		ptp_ocp_settime(&bp->ptp_info, &ts);
	}
	if (!ptp_ocp_gettimex(&bp->ptp_info, &ts, NULL))
		dev_info(&bp->pdev->dev, "Time: %lld.%ld, %s\n",
			 ts.tv_sec, ts.tv_nsec,
			 sync ? "in-sync" : "UNSYNCED");

	return 0;
}

static void
ptp_ocp_tod_info(struct ptp_ocp *bp)
{
	static const char * const proto_name[] = {
		"NMEA", "NMEA_ZDA", "NMEA_RMC", "NMEA_none",
		"UBX", "UBX_UTC", "UBX_LS", "UBX_none"
	};
	static const char * const gnss_name[] = {
		"ALL", "COMBINED", "GPS", "GLONASS", "GALILEO", "BEIDOU",
	};
	u32 version, ctrl, reg;
	int idx;

	version = ioread32(&bp->tod->version);
	dev_info(&bp->pdev->dev, "TOD Version %d.%d.%d\n",
		 version >> 24, (version >> 16) & 0xff, version & 0xffff);

	ctrl = ioread32(&bp->tod->ctrl);
	ctrl |= TOD_CTRL_PROTOCOL | TOD_CTRL_ENABLE;
	ctrl &= ~(TOD_CTRL_DISABLE_FMT_A | TOD_CTRL_DISABLE_FMT_B);
	iowrite32(ctrl, &bp->tod->ctrl);

	ctrl = ioread32(&bp->tod->ctrl);
	idx = ctrl & TOD_CTRL_PROTOCOL ? 4 : 0;
	idx += (ctrl >> 16) & 3;
	dev_info(&bp->pdev->dev, "control: %x\n", ctrl);
	dev_info(&bp->pdev->dev, "TOD Protocol %s %s\n", proto_name[idx],
		 ctrl & TOD_CTRL_ENABLE ? "enabled" : "");

	idx = (ctrl >> TOD_CTRL_GNSS_SHIFT) & TOD_CTRL_GNSS_MASK;
	if (idx < ARRAY_SIZE(gnss_name))
		dev_info(&bp->pdev->dev, "GNSS %s\n", gnss_name[idx]);

	reg = ioread32(&bp->tod->status);
	dev_info(&bp->pdev->dev, "status: %x\n", reg);

	reg = ioread32(&bp->tod->correction_sec);
	dev_info(&bp->pdev->dev, "correction: %d\n", reg);

	reg = ioread32(&bp->tod->utc_status);
	dev_info(&bp->pdev->dev, "utc_status: %x\n", reg);
	dev_info(&bp->pdev->dev, "utc_offset: %d  valid:%d  leap_valid:%d\n",
		 reg & TOD_STATUS_UTC_MASK, reg & TOD_STATUS_UTC_VALID ? 1 : 0,
		 reg & TOD_STATUS_LEAP_VALID ? 1 : 0);
}

static void
ptp_ocp_info(struct ptp_ocp *bp)
{
	static const char * const clock_name[] = {
		"NO", "TOD", "IRIG", "PPS", "PTP", "RTC", "REGS", "EXT"
	};
	u32 version, select;

	version = ioread32(&bp->reg->version);
	select = ioread32(&bp->reg->select);
	dev_info(&bp->pdev->dev, "Version %d.%d.%d, clock %s, device ptp%d\n",
		 version >> 24, (version >> 16) & 0xff, version & 0xffff,
		 clock_name[select & 7],
		 ptp_clock_index(bp->ptp));

	ptp_ocp_tod_info(bp);
}

static int
ptp_ocp_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
	struct ptp_ocp *bp;
	int err;

	bp = kzalloc(sizeof(*bp), GFP_KERNEL);
	if (!bp)
		return -ENOMEM;
	bp->pdev = pdev;
	pci_set_drvdata(pdev, bp);

	err = pci_enable_device(pdev);
	if (err) {
		dev_err(&pdev->dev, "pci_enable_device\n");
		goto out_free;
	}

	err = pci_request_regions(pdev, KBUILD_MODNAME);
	if (err) {
		dev_err(&pdev->dev, "pci_request_region\n");
		goto out_disable;
	}

	bp->base = pci_ioremap_bar(pdev, 0);
	if (!bp->base) {
		dev_err(&pdev->dev, "io_remap bar0\n");
		err = -ENOMEM;
		goto out;
	}
	bp->reg = bp->base + OCP_REGISTER_OFFSET;
	bp->tod = bp->base + TOD_REGISTER_OFFSET;
	bp->ptp_info = ptp_ocp_clock_info;
	spin_lock_init(&bp->lock);

	err = ptp_ocp_check_clock(bp);
	if (err)
		goto out;

	bp->ptp = ptp_clock_register(&bp->ptp_info, &pdev->dev);
	if (IS_ERR(bp->ptp)) {
		dev_err(&pdev->dev, "ptp_clock_register\n");
		err = PTR_ERR(bp->ptp);
		goto out;
	}

	ptp_ocp_info(bp);

	return 0;

out:
	pci_release_regions(pdev);
out_disable:
	pci_disable_device(pdev);
out_free:
	kfree(bp);

	return err;
}

static void
ptp_ocp_remove(struct pci_dev *pdev)
{
	struct ptp_ocp *bp = pci_get_drvdata(pdev);

	ptp_clock_unregister(bp->ptp);
	pci_iounmap(pdev, bp->base);
	pci_release_regions(pdev);
	pci_disable_device(pdev);
	pci_set_drvdata(pdev, NULL);
	kfree(bp);
}

static struct pci_driver ptp_ocp_driver = {
	.name		= KBUILD_MODNAME,
	.id_table	= ptp_ocp_pcidev_id,
	.probe		= ptp_ocp_probe,
	.remove		= ptp_ocp_remove,
};

static int __init
ptp_ocp_init(void)
{
	int err;

	err = pci_register_driver(&ptp_ocp_driver);
	return err;
}

static void __exit
ptp_ocp_fini(void)
{
	pci_unregister_driver(&ptp_ocp_driver);
}

module_init(ptp_ocp_init);
module_exit(ptp_ocp_fini);

MODULE_DESCRIPTION("OpenCompute TimeCard driver");
MODULE_LICENSE("GPL v2");